2020-09-22 12:52:47

by Gene Chen

Subject: [PATCH v4 0/2] leds: mt6360: Add LED driver for MT6360

This patch series add MT6360 LED support contains driver and binding document

Gene Chen (2)
dt-bindings: leds: Add bindings for MT6360 LED
leds: mt6360: Add LED driver for MT6360

Documentation/devicetree/bindings/leds/leds-mt6360.yaml | 107 ++
drivers/leds/Kconfig | 11
drivers/leds/Makefile | 1
drivers/leds/leds-mt6360.c | 705 ++++++++++++++++
4 files changed, 824 insertions(+)

changelogs between v1 & v2
- add led driver with mfd

changelogs between v2 & v3
- independent add led driver
- add dt-binding document
- refactor macros definition for easy to debug
- parse device tree by fwnode
- use devm*ext to register led class device

changelogs between v3 & v4
- fix binding document description
- use GENMASK and add unit postfix to definition
- isink register led class device

2020-09-22 12:53:43

by Gene Chen

Subject: [PATCH v4 2/2] leds: mt6360: Add LED driver for MT6360

From: Gene Chen <[email protected]>

Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
and 4-channel RGB LED support Register/Flash/Breath Mode

Signed-off-by: Gene Chen <[email protected]>
---
drivers/leds/Kconfig | 11 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-mt6360.c | 705 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 717 insertions(+)
create mode 100644 drivers/leds/leds-mt6360.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1c181df..5561b08 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -271,6 +271,17 @@ config LEDS_MT6323
This option enables support for on-chip LED drivers found on
Mediatek MT6323 PMIC.

+config LEDS_MT6360
+ tristate "LED Support for Mediatek MT6360 PMIC"
+ depends on LEDS_CLASS_FLASH && OF
+ depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
+ depends on MFD_MT6360
+ help
+ This option enables support for dual Flash LED drivers found on
+ Mediatek MT6360 PMIC.
+ Independent current sources supply for each flash LED support torch
+ and strobe mode.
+
config LEDS_S3C24XX
tristate "LED Support for Samsung S3C24XX GPIO LEDs"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index c2c7d7a..5596427 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -66,6 +66,7 @@ obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
+obj-$(CONFIG_LEDS_MT6360) += leds-mt6360.o
obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
diff --git a/drivers/leds/leds-mt6360.c b/drivers/leds/leds-mt6360.c
new file mode 100644
index 0000000..1c3486e
--- /dev/null
+++ b/drivers/leds/leds-mt6360.c
@@ -0,0 +1,705 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/led-class-flash.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <media/v4l2-flash-led-class.h>
+
+enum {
+ MT6360_LED_ISNK1 = 0,
+ MT6360_LED_ISNK2,
+ MT6360_LED_ISNK3,
+ MT6360_LED_ISNK4,
+ MT6360_LED_FLASH1,
+ MT6360_LED_FLASH2,
+ MT6360_MAX_LEDS
+};
+
+#define MT6360_REG_RGBEN 0x380
+#define MT6360_REG_ISNK(_led_no) (0x381 + (_led_no))
+#define MT6360_ISNK_ENMASK(_led_no) BIT(7 - (_led_no))
+#define MT6360_ISNK_MASK GENMASK(4, 0)
+#define MT6360_CHRINDSEL_MASK BIT(3)
+
+#define MT6360_REG_FLEDEN 0x37E
+#define MT6360_REG_STRBTO 0x373
+#define MT6360_REG_FLEDBASE(_id) (0x372 + 4 * (_id - MT6360_LED_FLASH1))
+#define MT6360_REG_FLEDISTRB(_id) (MT6360_REG_FLEDBASE(_id) + 2)
+#define MT6360_REG_FLEDITOR(_id) (MT6360_REG_FLEDBASE(_id) + 3)
+#define MT6360_REG_CHGSTAT2 0x3E1
+#define MT6360_REG_FLEDSTAT1 0x3E9
+#define MT6360_ITORCH_MASK GENMASK(4, 0)
+#define MT6360_ISTROBE_MASK GENMASK(6, 0)
+#define MT6360_STRBTO_MASK GENMASK(6, 0)
+#define MT6360_TORCHEN_MASK BIT(3)
+#define MT6360_STROBEN_MASK BIT(2)
+#define MT6360_FLCSEN_MASK(_id) BIT(MT6360_LED_FLASH2 - _id)
+#define MT6360_FLEDCHGVINOVP_MASK BIT(3)
+#define MT6360_FLED1STRBTO_MASK BIT(11)
+#define MT6360_FLED2STRBTO_MASK BIT(10)
+#define MT6360_FLED1STRB_MASK BIT(9)
+#define MT6360_FLED2STRB_MASK BIT(8)
+#define MT6360_FLED1SHORT_MASK BIT(7)
+#define MT6360_FLED2SHORT_MASK BIT(6)
+#define MT6360_FLEDLVF_MASK BIT(3)
+
+#define MT6360_ISNK1_STEPUA 2000
+#define MT6360_ISNK1_MAXUA 24000
+#define MT6360_ISNK4_STEPUA 5000
+#define MT6360_ISNK4_MAXUA 150000
+
+#define MT6360_ITORCH_MINUA 25000
+#define MT6360_ITORCH_STEPUA 12500
+#define MT6360_ITORCH_MAXUA 400000
+#define MT6360_ISTRB_MINUA 50000
+#define MT6360_ISTRB_STEPUA 12500
+#define MT6360_ISTRB_MAXUA 1500000
+#define MT6360_STRBTO_MINUS 64000
+#define MT6360_STRBTO_STEPUS 32000
+#define MT6360_STRBTO_MAXUS 2432000
+
+#define STATE_OFF 0
+#define STATE_KEEP 1
+#define STATE_ON 2
+
+struct mt6360_led {
+ union {
+ struct led_classdev isnk;
+ struct led_classdev_flash flash;
+ };
+ struct v4l2_flash *v4l2_flash;
+ struct mt6360_priv *priv;
+ u32 led_no;
+ u32 default_state;
+};
+
+struct mt6360_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ unsigned int fled_strobe_used;
+ unsigned int fled_torch_used;
+ unsigned int leds_active;
+ unsigned int leds_count;
+ struct mt6360_led leds[];
+};
+
+static int mt6360_isnk_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
+{
+ struct mt6360_led *led = container_of(lcdev, struct mt6360_led, isnk);
+ struct mt6360_priv *priv = led->priv;
+ u32 enable_mask = MT6360_ISNK_ENMASK(led->led_no);
+ u32 val = level ? MT6360_ISNK_ENMASK(led->led_no) : 0;
+ int ret;
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no),
+ MT6360_ISNK_MASK, level);
+ if (ret)
+ return ret;
+
+ return regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
+}
+
+static int mt6360_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
+{
+ struct mt6360_led *led = container_of(lcdev, struct mt6360_led, flash.led_cdev);
+ struct mt6360_priv *priv = led->priv;
+ u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
+ u32 val = level ? MT6360_FLCSEN_MASK(led->led_no) : 0;
+ u32 prev = priv->fled_torch_used, curr;
+ int ret;
+
+ /* Only one set of flash control logic, use the flag to avoid strobe is currently used */
+ if (priv->fled_strobe_used) {
+ dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
+ return -EBUSY;
+ }
+
+ if (level)
+ curr = prev | BIT(led->led_no);
+ else
+ curr = prev & ~BIT(led->led_no);
+
+ if (curr)
+ val |= MT6360_TORCHEN_MASK;
+
+ if (level) {
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDITOR(led->led_no),
+ MT6360_ITORCH_MASK, level - 1);
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
+ if (ret)
+ return ret;
+
+ priv->fled_torch_used = curr;
+
+ return 0;
+}
+
+static int mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
+{
+ /*
+ * Due to the current spike when turning on flash, only let brightness keep by framework
+ * This empty function is used to prevent led_classdev_flash register ops check
+ */
+ return 0;
+}
+
+static int _mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
+{
+ struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
+ struct mt6360_priv *priv = led->priv;
+ struct led_flash_setting *s = &fl_cdev->brightness;
+ u32 val = (brightness - s->min) / s->step;
+
+ return regmap_update_bits(priv->regmap, MT6360_REG_FLEDISTRB(led->led_no),
+ MT6360_ISTROBE_MASK, val);
+}
+
+static int mt6360_strobe_set(struct led_classdev_flash *fl_cdev, bool state)
+{
+ struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
+ struct mt6360_priv *priv = led->priv;
+ struct led_classdev *lcdev = &fl_cdev->led_cdev;
+ struct led_flash_setting *s = &fl_cdev->brightness;
+ u32 enable_mask = MT6360_STROBEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
+ u32 val = state ? MT6360_FLCSEN_MASK(led->led_no) : 0;
+ u32 prev = priv->fled_strobe_used, curr;
+ int ret;
+
+ /* Only one set of flash control logic, use the flag to avoid torch is currently used */
+ if (priv->fled_torch_used) {
+ dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", priv->fled_torch_used);
+ return -EBUSY;
+ }
+
+ if (state)
+ curr = prev | BIT(led->led_no);
+ else
+ curr = prev & ~BIT(led->led_no);
+
+ if (curr)
+ val |= MT6360_STROBEN_MASK;
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
+ if (ret) {
+ dev_err(lcdev->dev, "[%d] control current source %d fail\n", led->led_no, state);
+ return ret;
+ }
+
+ /*
+ * If the flash need to be on, config the flash current ramping up to the setting value
+ * Else, always recover back to the minimum one
+ */
+ ret = _mt6360_flash_brightness_set(fl_cdev, state ? s->val : s->min);
+ if (ret)
+ return ret;
+
+ /* For the flash turn on/off, HW rampping up/down time is 5ms/500us, respectively */
+ if (!prev && curr)
+ usleep_range(5000, 6000);
+ else if (prev && !curr)
+ udelay(500);
+
+ priv->fled_strobe_used = curr;
+ return 0;
+}
+
+static int mt6360_strobe_get(struct led_classdev_flash *fl_cdev, bool *state)
+{
+ struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
+ struct mt6360_priv *priv = led->priv;
+
+ *state = !!(priv->fled_strobe_used & BIT(led->led_no));
+ return 0;
+}
+
+static int mt6360_timeout_set(struct led_classdev_flash *fl_cdev, u32 timeout)
+{
+ struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
+ struct mt6360_priv *priv = led->priv;
+ struct led_flash_setting *s = &fl_cdev->timeout;
+ u32 val = (timeout - s->min) / s->step;
+
+ return regmap_update_bits(priv->regmap, MT6360_REG_STRBTO, MT6360_STRBTO_MASK, val);
+
+}
+
+static int mt6360_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
+{
+ struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
+ struct mt6360_priv *priv = led->priv;
+ u16 fled_stat;
+ unsigned int chg_stat, strobe_timeout_mask, fled_short_mask;
+ u32 rfault = 0;
+ int ret;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_CHGSTAT2, &chg_stat);
+ if (ret)
+ return ret;
+
+ ret = regmap_raw_read(priv->regmap, MT6360_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
+ if (ret)
+ return ret;
+
+ if (led->led_no == MT6360_LED_FLASH1) {
+ strobe_timeout_mask = MT6360_FLED1STRBTO_MASK;
+ fled_short_mask = MT6360_FLED1SHORT_MASK;
+ } else {
+ strobe_timeout_mask = MT6360_FLED2STRBTO_MASK;
+ fled_short_mask = MT6360_FLED2SHORT_MASK;
+ }
+
+ if (chg_stat & MT6360_FLEDCHGVINOVP_MASK)
+ rfault |= LED_FAULT_INPUT_VOLTAGE;
+
+ if (fled_stat & strobe_timeout_mask)
+ rfault |= LED_FAULT_TIMEOUT;
+
+ if (fled_stat & fled_short_mask)
+ rfault |= LED_FAULT_SHORT_CIRCUIT;
+
+ if (fled_stat & MT6360_FLEDLVF_MASK)
+ rfault |= LED_FAULT_UNDER_VOLTAGE;
+
+ *fault = rfault;
+ return 0;
+}
+
+static const struct led_flash_ops mt6360_flash_ops = {
+ .flash_brightness_set = mt6360_flash_brightness_set,
+ .strobe_set = mt6360_strobe_set,
+ .strobe_get = mt6360_strobe_get,
+ .timeout_set = mt6360_timeout_set,
+ .fault_get = mt6360_fault_get,
+};
+
+static int mt6360_isnk_init_default_state(struct mt6360_led *led)
+{
+ struct mt6360_priv *priv = led->priv;
+ unsigned int regval;
+ u32 level;
+ int ret;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_ISNK(led->led_no), &regval);
+ if (ret)
+ return ret;
+ level = regval & MT6360_ISNK_MASK;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_RGBEN, &regval);
+ if (ret)
+ return ret;
+
+ if (!(regval & MT6360_ISNK_ENMASK(led->led_no)))
+ level = LED_OFF;
+
+ switch (led->default_state) {
+ case STATE_ON:
+ led->isnk.brightness = led->isnk.max_brightness;
+ break;
+ case STATE_KEEP:
+ led->isnk.brightness = min(level, led->isnk.max_brightness);
+ break;
+ default:
+ led->isnk.brightness = LED_OFF;
+ }
+
+ return mt6360_isnk_brightness_set(&led->isnk, led->isnk.brightness);
+}
+
+static int mt6360_flash_init_default_state(struct mt6360_led *led)
+{
+ struct led_classdev_flash *flash = &led->flash;
+ struct mt6360_priv *priv = led->priv;
+ u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
+ u32 level;
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_FLEDITOR(led->led_no), &regval);
+ if (ret)
+ return ret;
+ level = regval & MT6360_ITORCH_MASK;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_FLEDEN, &regval);
+ if (ret)
+ return ret;
+
+ if ((regval & enable_mask) == enable_mask)
+ level += 1;
+ else
+ level = LED_OFF;
+
+ switch (led->default_state) {
+ case STATE_ON:
+ flash->led_cdev.brightness = flash->led_cdev.max_brightness;
+ break;
+ case STATE_KEEP:
+ flash->led_cdev.brightness = min(level, flash->led_cdev.max_brightness);
+ break;
+ default:
+ flash->led_cdev.brightness = LED_OFF;
+ }
+
+ return mt6360_torch_brightness_set(&flash->led_cdev, flash->led_cdev.brightness);
+}
+
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+static int mt6360_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
+{
+ struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
+ struct mt6360_led *led = container_of(flash, struct mt6360_led, flash);
+ struct mt6360_priv *priv = led->priv;
+ u32 mask = MT6360_FLCSEN_MASK(led->led_no);
+ u32 val = enable ? mask : 0;
+ int ret;
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, mask, val);
+ if (ret)
+ return ret;
+
+ if (enable)
+ priv->fled_strobe_used |= BIT(led->led_no);
+ else
+ priv->fled_strobe_used &= ~BIT(led->led_no);
+
+ return 0;
+}
+
+static const struct v4l2_flash_ops v4l2_flash_ops = {
+ .external_strobe_set = mt6360_flash_external_strobe_set,
+};
+
+static void mt6360_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
+{
+ struct led_classdev *lcdev;
+ struct led_flash_setting *s = &config->intensity;
+
+ switch (led->led_no) {
+ case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
+ lcdev = &led->isnk;
+
+ if (led->led_no == MT6360_LED_ISNK4)
+ s->step = MT6360_ISNK4_STEPUA;
+ else
+ s->step = MT6360_ISNK1_STEPUA;
+
+ s->min = 0;
+ s->val = lcdev->brightness * s->step;
+ s->max = lcdev->max_brightness * s->step;
+ break;
+ default:
+ lcdev = &led->flash.led_cdev;
+
+ s->min = MT6360_ITORCH_MINUA;
+ s->step = MT6360_ITORCH_STEPUA;
+ s->val = s->max = s->min + (lcdev->max_brightness - 1) * s->step;
+
+ config->has_external_strobe = 1;
+ }
+
+ snprintf(config->dev_name, sizeof(config->dev_name), "%s", lcdev->name);
+}
+#else
+static const struct v4l2_flash_ops v4l2_flash_ops;
+
+static void mt6360_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
+{
+}
+#endif
+
+static int mt6360_led_register(struct device *parent, struct mt6360_led *led,
+ struct led_init_data *init_data)
+{
+ struct mt6360_priv *priv = led->priv;
+ struct v4l2_flash_config v4l2_config = {0};
+ int ret;
+
+ switch (led->led_no) {
+ case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
+ if (led->led_no == MT6360_LED_ISNK1) {
+ /* Change isink1 to SW control mode, disconnect it with charger state */
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN,
+ MT6360_CHRINDSEL_MASK, MT6360_CHRINDSEL_MASK);
+ if (ret) {
+ dev_err(parent, "Failed to config ISNK1 to SW mode\n");
+ return ret;
+ }
+ }
+
+ ret = mt6360_isnk_init_default_state(led);
+ if (ret) {
+ dev_err(parent, "Failed to init %d isnk state\n", led->led_no);
+ return ret;
+ }
+
+ ret = devm_led_classdev_register_ext(parent, &led->isnk, init_data);
+ if (ret) {
+ dev_err(parent, "Couldn't register isink %d\n", led->led_no);
+ return ret;
+ }
+
+ mt6360_init_v4l2_config(led, &v4l2_config);
+ led->v4l2_flash = v4l2_flash_indicator_init(parent, init_data->fwnode, &led->isnk,
+ &v4l2_config);
+ break;
+ default:
+ ret = mt6360_flash_init_default_state(led);
+ if (ret) {
+ dev_err(parent, "Failed to init %d flash state\n", led->led_no);
+ return ret;
+ }
+
+ ret = devm_led_classdev_flash_register_ext(parent, &led->flash, init_data);
+ if (ret) {
+ dev_err(parent, "Couldn't register flash %d\n", led->led_no);
+ return ret;
+ }
+
+ mt6360_init_v4l2_config(led, &v4l2_config);
+ led->v4l2_flash = v4l2_flash_init(parent, init_data->fwnode, &led->flash,
+ &v4l2_flash_ops, &v4l2_config);
+ }
+
+ if (IS_ERR(led->v4l2_flash)) {
+ dev_err(parent, "Failed to register %d v4l2 sd\n", led->led_no);
+ return PTR_ERR(led->v4l2_flash);
+ }
+
+ return 0;
+}
+
+static u32 clamp_align(u32 val, u32 min, u32 max, u32 step)
+{
+ u32 retval;
+
+ retval = clamp_val(val, min, max);
+ if (step > 1)
+ retval = rounddown(retval - min, step) + min;
+
+ return retval;
+}
+
+static int mt6360_init_isnk_properties(struct mt6360_led *led, struct led_init_data *init_data)
+{
+ struct led_classdev *isnk = &led->isnk;
+ struct mt6360_priv *priv = led->priv;
+ u32 step_uA, max_uA;
+ u32 val;
+ int ret;
+
+ if (led->led_no == MT6360_LED_ISNK4) {
+ step_uA = MT6360_ISNK4_STEPUA;
+ max_uA = MT6360_ISNK4_MAXUA;
+ } else {
+ step_uA = MT6360_ISNK1_STEPUA;
+ max_uA = MT6360_ISNK1_MAXUA;
+ }
+
+ ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
+ if (ret) {
+ dev_warn(priv->dev, "Not specified led-max-microamp, config to the minimum step\n");
+ val = 1 * step_uA;
+ } else
+ val = clamp_align(val, 0, max_uA, step_uA);
+
+ isnk->max_brightness = val / step_uA;
+ isnk->brightness_set_blocking = mt6360_isnk_brightness_set;
+
+ fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
+ &isnk->default_trigger);
+
+ return 0;
+}
+
+static int mt6360_init_flash_properties(struct mt6360_led *led, struct led_init_data *init_data)
+{
+ struct led_classdev_flash *flash = &led->flash;
+ struct led_classdev *lcdev = &flash->led_cdev;
+ struct mt6360_priv *priv = led->priv;
+ struct led_flash_setting *s;
+ u32 val;
+ int ret;
+
+ ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
+ if (ret) {
+ dev_warn(priv->dev, "Not specified led-max-microamp, config to the minimum\n");
+ val = MT6360_ITORCH_MINUA;
+ } else
+ val = clamp_align(val, MT6360_ITORCH_MINUA, MT6360_ITORCH_MAXUA,
+ MT6360_ITORCH_STEPUA);
+
+ lcdev->max_brightness = (val - MT6360_ITORCH_MINUA) / MT6360_ITORCH_STEPUA + 1;
+ lcdev->brightness_set_blocking = mt6360_torch_brightness_set;
+ lcdev->flags |= LED_DEV_CAP_FLASH;
+
+ ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-microamp", &val);
+ if (ret) {
+ dev_warn(priv->dev, "Not specified flash-max-microamp, config to the minimum\n");
+ val = MT6360_ISTRB_MINUA;
+ } else
+ val = clamp_align(val, MT6360_ISTRB_MINUA, MT6360_ISTRB_MAXUA, MT6360_ISTRB_STEPUA);
+
+ s = &flash->brightness;
+ s->min = MT6360_ISTRB_MINUA;
+ s->step = MT6360_ISTRB_STEPUA;
+ s->val = s->max = val;
+
+ /* Always configure as min level when off to prevent flash current spike */
+ ret = _mt6360_flash_brightness_set(flash, s->min);
+ if (ret)
+ return ret;
+
+ ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-timeout-us", &val);
+ if (ret) {
+ dev_warn(priv->dev, "Not specified flash-max-timeout-us, config to the minimum\n");
+ val = MT6360_STRBTO_MINUS;
+ } else
+ val = clamp_align(val, MT6360_STRBTO_MINUS, MT6360_STRBTO_MAXUS,
+ MT6360_STRBTO_STEPUS);
+
+ s = &flash->timeout;
+ s->min = MT6360_STRBTO_MINUS;
+ s->step = MT6360_STRBTO_STEPUS;
+ s->val = s->max = val;
+
+ flash->ops = &mt6360_flash_ops;
+
+ return 0;
+}
+
+static int mt6360_init_common_properties(struct mt6360_led *led, struct led_init_data *init_data)
+{
+ const char * const states[] = { "off", "keep", "on" };
+ const char *str;
+ int ret;
+
+ if (!fwnode_property_read_string(init_data->fwnode, "default-state", &str)) {
+ ret = match_string(states, ARRAY_SIZE(states), str);
+ if (ret < 0)
+ ret = STATE_OFF;
+
+ led->default_state = ret;
+ }
+
+ return 0;
+}
+
+static void mt6360_v4l2_flash_release(struct mt6360_priv *priv)
+{
+ int i;
+
+ for (i = 0; i < priv->leds_count; i++) {
+ struct mt6360_led *led = priv->leds + i;
+
+ if (led->v4l2_flash)
+ v4l2_flash_release(led->v4l2_flash);
+
+ }
+}
+
+static int mt6360_led_probe(struct platform_device *pdev)
+{
+ struct mt6360_priv *priv;
+ struct fwnode_handle *child;
+ size_t count;
+ int i = 0, ret;
+
+ count = device_get_child_node_count(&pdev->dev);
+ if (!count || count > MT6360_MAX_LEDS)
+ return -EINVAL;
+
+ priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, count), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->leds_count = count;
+ priv->dev = &pdev->dev;
+
+ priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!priv->regmap) {
+ dev_err(&pdev->dev, "Failed to get parent regmap\n");
+ return -ENODEV;
+ }
+
+ device_for_each_child_node(&pdev->dev, child) {
+ struct mt6360_led *led = priv->leds + i;
+ struct led_init_data init_data = { .fwnode = child, };
+ u32 reg;
+
+ ret = fwnode_property_read_u32(child, "reg", &reg);
+ if (ret)
+ goto out_flash_release;
+
+ if (reg >= MT6360_MAX_LEDS || priv->leds_active & BIT(reg))
+ return -EINVAL;
+ priv->leds_active |= BIT(reg);
+
+ led->led_no = reg;
+ led->priv = priv;
+
+ ret = mt6360_init_common_properties(led, &init_data);
+ if (ret)
+ goto out_flash_release;
+
+ switch (reg) {
+ case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
+ ret = mt6360_init_isnk_properties(led, &init_data);
+ break;
+ default:
+ ret = mt6360_init_flash_properties(led, &init_data);
+ }
+
+ if (ret)
+ goto out_flash_release;
+
+ ret = mt6360_led_register(&pdev->dev, led, &init_data);
+ if (ret)
+ goto out_flash_release;
+
+ i++;
+ }
+
+ platform_set_drvdata(pdev, priv);
+ return 0;
+
+out_flash_release:
+ mt6360_v4l2_flash_release(priv);
+ return ret;
+}
+
+static int mt6360_led_remove(struct platform_device *pdev)
+{
+ struct mt6360_priv *priv = platform_get_drvdata(pdev);
+
+ mt6360_v4l2_flash_release(priv);
+ return 0;
+}
+
+static const struct of_device_id __maybe_unused mt6360_led_of_id[] = {
+ { .compatible = "mediatek,mt6360-led", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mt6360_led_of_id);
+
+static struct platform_driver mt6360_led_driver = {
+ .driver = {
+ .name = "mt6360-led",
+ .of_match_table = mt6360_led_of_id,
+ },
+ .probe = mt6360_led_probe,
+ .remove = mt6360_led_remove,
+};
+module_platform_driver(mt6360_led_driver);
+
+MODULE_AUTHOR("Gene Chen <[email protected]>");
+MODULE_DESCRIPTION("MT6360 LED Driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4

2020-09-22 12:54:13

by Gene Chen

Subject: [PATCH v4 1/2] dt-bindings: leds: Add bindings for MT6360 LED

From: Gene Chen <[email protected]>

Add bindings document for LED support on MT6360 PMIC

Signed-off-by: Gene Chen <[email protected]>
---
.../devicetree/bindings/leds/leds-mt6360.yaml | 107 +++++++++++++++++++++
1 file changed, 107 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/leds-mt6360.yaml

diff --git a/Documentation/devicetree/bindings/leds/leds-mt6360.yaml b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
new file mode 100644
index 0000000..a356a1f
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
@@ -0,0 +1,107 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-mt6360.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LED driver for MT6360 PMIC from MediaTek Integrated.
+
+maintainers:
+ - Gene Chen <[email protected]>
+
+description: |
+ This module is part of the MT6360 MFD device.
+ Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
+ and 4-channel RGB LED support Register/Flash/Breath Mode
+
+properties:
+ compatible:
+ const: mediatek,mt6360-led
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+patternProperties:
+ "^led@[0-5]$":
+ type: object
+ $ref: common.yaml#
+ description:
+ Properties for a single LED.
+
+ properties:
+ reg:
+ description: Index of the LED.
+ enum:
+ - 0 # LED output INDICATOR1
+ - 1 # LED output INDICATOR2
+ - 2 # LED output INDICATOR3
+ - 3 # LED output INDICATOR4
+ - 4 # LED output FLED1
+ - 5 # LED output FLED2
+
+unevaluatedProperties: false
+
+required:
+ - compatible
+ - "#address-cells"
+ - "#size-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/leds/common.h>
+ led-controller {
+ compatible = "mediatek,mt6360-led";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ reg = <0>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_RED>;
+ default-state = "off";
+ };
+ led@1 {
+ reg = <1>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_GREEN>;
+ default-state = "off";
+ };
+ led@2 {
+ reg = <2>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_BLUE>;
+ default-state = "off";
+ };
+ led@3 {
+ reg = <3>;
+ function = LED_FUNCTION_INDICATOR;
+ color = <LED_COLOR_ID_AMBER>;
+ default-state = "off";
+ };
+ led@4 {
+ reg = <4>;
+ function = LED_FUNCTION_FLASH;
+ color = <LED_COLOR_ID_WHITE>;
+ function-enumerator = <1>;
+ default-state = "off";
+ led-max-microamp = <200000>;
+ flash-max-microamp = <500000>;
+ flash-max-timeout-us = <1024000>;
+ };
+ led@5 {
+ reg = <5>;
+ function = LED_FUNCTION_FLASH;
+ color = <LED_COLOR_ID_WHITE>;
+ function-enumerator = <2>;
+ default-state = "off";
+ led-max-microamp = <200000>;
+ flash-max-microamp = <500000>;
+ flash-max-timeout-us = <1024000>;
+ };
+ };
+...
--
2.7.4

2020-09-23 21:51:34

by Jacek Anaszewski

Subject: Re: [PATCH v4 2/2] leds: mt6360: Add LED driver for MT6360

Hi Gene,

Thank you for the update. I have some more comments below.

On 9/23/20 2:50 PM, Gene Chen wrote:
> From: Gene Chen <[email protected]>
>
> Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> and 4-channel RGB LED support Register/Flash/Breath Mode
>
> Signed-off-by: Gene Chen <[email protected]>
> ---
> drivers/leds/Kconfig | 11 +
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-mt6360.c | 705 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 717 insertions(+)
> create mode 100644 drivers/leds/leds-mt6360.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 1c181df..5561b08 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -271,6 +271,17 @@ config LEDS_MT6323
> This option enables support for on-chip LED drivers found on
> Mediatek MT6323 PMIC.
>
> +config LEDS_MT6360
> + tristate "LED Support for Mediatek MT6360 PMIC"
> + depends on LEDS_CLASS_FLASH && OF
> + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
> + depends on MFD_MT6360
> + help
> + This option enables support for dual Flash LED drivers found on
> + Mediatek MT6360 PMIC.
> + Independent current sources supply for each flash LED support torch
> + and strobe mode.
> +
> config LEDS_S3C24XX
> tristate "LED Support for Samsung S3C24XX GPIO LEDs"
> depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index c2c7d7a..5596427 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -66,6 +66,7 @@ obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
> obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
> obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
> obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
> +obj-$(CONFIG_LEDS_MT6360) += leds-mt6360.o
> obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
> obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
> obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
> diff --git a/drivers/leds/leds-mt6360.c b/drivers/leds/leds-mt6360.c
> new file mode 100644
> index 0000000..1c3486e
> --- /dev/null
> +++ b/drivers/leds/leds-mt6360.c
> @@ -0,0 +1,705 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/led-class-flash.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +#include <linux/regmap.h>
> +#include <media/v4l2-flash-led-class.h>
> +
> +enum {
> + MT6360_LED_ISNK1 = 0,
> + MT6360_LED_ISNK2,
> + MT6360_LED_ISNK3,
> + MT6360_LED_ISNK4,

One question about these ISINKs - how are they exploited in your device?
Are these LEDs used to indicate camera activity or it is one RGB LED
for status? And what functionality has the remaining amber one (sticking
to the naming from your DT bindings)?

Can you share how the documenation for this device describes the purpose
of these sinks, if it does it at all?

I got probably mislead by your naming in the driver and got fixed on
their function as camera activity indicators, for which V4L2 has
support. If that is not the case, then you'd better switch to using
multicolor framework for all four "indicator" LEDs.

> + MT6360_LED_FLASH1,
> + MT6360_LED_FLASH2,
> + MT6360_MAX_LEDS
> +};
> +
> +#define MT6360_REG_RGBEN 0x380
> +#define MT6360_REG_ISNK(_led_no) (0x381 + (_led_no))
> +#define MT6360_ISNK_ENMASK(_led_no) BIT(7 - (_led_no))
> +#define MT6360_ISNK_MASK GENMASK(4, 0)
> +#define MT6360_CHRINDSEL_MASK BIT(3)
> +
> +#define MT6360_REG_FLEDEN 0x37E
> +#define MT6360_REG_STRBTO 0x373
> +#define MT6360_REG_FLEDBASE(_id) (0x372 + 4 * (_id - MT6360_LED_FLASH1))
> +#define MT6360_REG_FLEDISTRB(_id) (MT6360_REG_FLEDBASE(_id) + 2)
> +#define MT6360_REG_FLEDITOR(_id) (MT6360_REG_FLEDBASE(_id) + 3)
> +#define MT6360_REG_CHGSTAT2 0x3E1
> +#define MT6360_REG_FLEDSTAT1 0x3E9
> +#define MT6360_ITORCH_MASK GENMASK(4, 0)
> +#define MT6360_ISTROBE_MASK GENMASK(6, 0)
> +#define MT6360_STRBTO_MASK GENMASK(6, 0)
> +#define MT6360_TORCHEN_MASK BIT(3)
> +#define MT6360_STROBEN_MASK BIT(2)
> +#define MT6360_FLCSEN_MASK(_id) BIT(MT6360_LED_FLASH2 - _id)
> +#define MT6360_FLEDCHGVINOVP_MASK BIT(3)
> +#define MT6360_FLED1STRBTO_MASK BIT(11)
> +#define MT6360_FLED2STRBTO_MASK BIT(10)
> +#define MT6360_FLED1STRB_MASK BIT(9)
> +#define MT6360_FLED2STRB_MASK BIT(8)
> +#define MT6360_FLED1SHORT_MASK BIT(7)
> +#define MT6360_FLED2SHORT_MASK BIT(6)
> +#define MT6360_FLEDLVF_MASK BIT(3)
> +
> +#define MT6360_ISNK1_STEPUA 2000
> +#define MT6360_ISNK1_MAXUA 24000
> +#define MT6360_ISNK4_STEPUA 5000
> +#define MT6360_ISNK4_MAXUA 150000
> +
> +#define MT6360_ITORCH_MINUA 25000
> +#define MT6360_ITORCH_STEPUA 12500
> +#define MT6360_ITORCH_MAXUA 400000
> +#define MT6360_ISTRB_MINUA 50000
> +#define MT6360_ISTRB_STEPUA 12500
> +#define MT6360_ISTRB_MAXUA 1500000
> +#define MT6360_STRBTO_MINUS 64000
> +#define MT6360_STRBTO_STEPUS 32000
> +#define MT6360_STRBTO_MAXUS 2432000
> +
> +#define STATE_OFF 0
> +#define STATE_KEEP 1
> +#define STATE_ON 2
> +
> +struct mt6360_led {
> + union {
> + struct led_classdev isnk;
> + struct led_classdev_flash flash;
> + };
> + struct v4l2_flash *v4l2_flash;
> + struct mt6360_priv *priv;
> + u32 led_no;
> + u32 default_state;
> +};
> +
> +struct mt6360_priv {
> + struct device *dev;
> + struct regmap *regmap;
> + unsigned int fled_strobe_used;
> + unsigned int fled_torch_used;
> + unsigned int leds_active;
> + unsigned int leds_count;
> + struct mt6360_led leds[];
> +};
> +
> +static int mt6360_isnk_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> +{
> + struct mt6360_led *led = container_of(lcdev, struct mt6360_led, isnk);
> + struct mt6360_priv *priv = led->priv;
> + u32 enable_mask = MT6360_ISNK_ENMASK(led->led_no);
> + u32 val = level ? MT6360_ISNK_ENMASK(led->led_no) : 0;
> + int ret;

You meed mutex protection in all functions acessing device registers.

> + ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no),
> + MT6360_ISNK_MASK, level);
> + if (ret)
> + return ret;
> +
> + return regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
> +}
> +
> +static int mt6360_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> +{
> + struct mt6360_led *led = container_of(lcdev, struct mt6360_led, flash.led_cdev);
> + struct mt6360_priv *priv = led->priv;
> + u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> + u32 val = level ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> + u32 prev = priv->fled_torch_used, curr;

Above assignment must be made under mutex.

> + int ret;
> +
> + /* Only one set of flash control logic, use the flag to avoid strobe is currently used */
> + if (priv->fled_strobe_used) {
> + dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
> + return -EBUSY;
> + }
> +
> + if (level)
> + curr = prev | BIT(led->led_no);
> + else
> + curr = prev & ~BIT(led->led_no);
> +
> + if (curr)
> + val |= MT6360_TORCHEN_MASK;
> +
> + if (level) {
> + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDITOR(led->led_no),
> + MT6360_ITORCH_MASK, level - 1);
> + if (ret)
> + return ret;
> + }
> +
> + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
> + if (ret)
> + return ret;
> +
> + priv->fled_torch_used = curr;

Ditto. And everything between as well of course.

> +
> + return 0;
> +}
> +
> +static int mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> +{
> + /*
> + * Due to the current spike when turning on flash, only let brightness keep by framework

s/keep by/to be kept/

> + * This empty function is used to prevent led_classdev_flash register ops check

s/led_classdev_flash/led_classdev_flash()/
s/check/check failure/

And please put dots at the end of sentences.

> + */
> + return 0;
> +}
> +
> +static int _mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> +{
> + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> + struct mt6360_priv *priv = led->priv;
> + struct led_flash_setting *s = &fl_cdev->brightness;
> + u32 val = (brightness - s->min) / s->step;
> +
> + return regmap_update_bits(priv->regmap, MT6360_REG_FLEDISTRB(led->led_no),
> + MT6360_ISTROBE_MASK, val);
> +}
> +
> +static int mt6360_strobe_set(struct led_classdev_flash *fl_cdev, bool state)
> +{
> + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> + struct mt6360_priv *priv = led->priv;
> + struct led_classdev *lcdev = &fl_cdev->led_cdev;
> + struct led_flash_setting *s = &fl_cdev->brightness;
> + u32 enable_mask = MT6360_STROBEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> + u32 val = state ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> + u32 prev = priv->fled_strobe_used, curr;
> + int ret;
> +
> + /* Only one set of flash control logic, use the flag to avoid torch is currently used */
> + if (priv->fled_torch_used) {
> + dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", priv->fled_torch_used);
> + return -EBUSY;
> + }
> +
> + if (state)
> + curr = prev | BIT(led->led_no);
> + else
> + curr = prev & ~BIT(led->led_no);
> +
> + if (curr)
> + val |= MT6360_STROBEN_MASK;
> +
> + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
> + if (ret) {
> + dev_err(lcdev->dev, "[%d] control current source %d fail\n", led->led_no, state);
> + return ret;
> + }
> +
> + /*
> + * If the flash need to be on, config the flash current ramping up to the setting value
> + * Else, always recover back to the minimum one
> + */
> + ret = _mt6360_flash_brightness_set(fl_cdev, state ? s->val : s->min);
> + if (ret)
> + return ret;
> +
> + /* For the flash turn on/off, HW rampping up/down time is 5ms/500us, respectively */
> + if (!prev && curr)
> + usleep_range(5000, 6000);
> + else if (prev && !curr)
> + udelay(500);
> +
> + priv->fled_strobe_used = curr;
> + return 0;
> +}
> +
> +static int mt6360_strobe_get(struct led_classdev_flash *fl_cdev, bool *state)
> +{
> + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> + struct mt6360_priv *priv = led->priv;
> +
> + *state = !!(priv->fled_strobe_used & BIT(led->led_no));
> + return 0;
> +}
> +
> +static int mt6360_timeout_set(struct led_classdev_flash *fl_cdev, u32 timeout)
> +{
> + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> + struct mt6360_priv *priv = led->priv;
> + struct led_flash_setting *s = &fl_cdev->timeout;
> + u32 val = (timeout - s->min) / s->step;
> +
> + return regmap_update_bits(priv->regmap, MT6360_REG_STRBTO, MT6360_STRBTO_MASK, val);
> +
> +}
> +
> +static int mt6360_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
> +{
> + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> + struct mt6360_priv *priv = led->priv;
> + u16 fled_stat;
> + unsigned int chg_stat, strobe_timeout_mask, fled_short_mask;
> + u32 rfault = 0;
> + int ret;
> +
> + ret = regmap_read(priv->regmap, MT6360_REG_CHGSTAT2, &chg_stat);
> + if (ret)
> + return ret;
> +
> + ret = regmap_raw_read(priv->regmap, MT6360_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
> + if (ret)
> + return ret;
> +
> + if (led->led_no == MT6360_LED_FLASH1) {
> + strobe_timeout_mask = MT6360_FLED1STRBTO_MASK;
> + fled_short_mask = MT6360_FLED1SHORT_MASK;
> + } else {
> + strobe_timeout_mask = MT6360_FLED2STRBTO_MASK;
> + fled_short_mask = MT6360_FLED2SHORT_MASK;
> + }
> +
> + if (chg_stat & MT6360_FLEDCHGVINOVP_MASK)
> + rfault |= LED_FAULT_INPUT_VOLTAGE;
> +
> + if (fled_stat & strobe_timeout_mask)
> + rfault |= LED_FAULT_TIMEOUT;
> +
> + if (fled_stat & fled_short_mask)
> + rfault |= LED_FAULT_SHORT_CIRCUIT;
> +
> + if (fled_stat & MT6360_FLEDLVF_MASK)
> + rfault |= LED_FAULT_UNDER_VOLTAGE;
> +
> + *fault = rfault;
> + return 0;
> +}
> +
> +static const struct led_flash_ops mt6360_flash_ops = {
> + .flash_brightness_set = mt6360_flash_brightness_set,
> + .strobe_set = mt6360_strobe_set,
> + .strobe_get = mt6360_strobe_get,
> + .timeout_set = mt6360_timeout_set,
> + .fault_get = mt6360_fault_get,
> +};
> +
> +static int mt6360_isnk_init_default_state(struct mt6360_led *led)
> +{
> + struct mt6360_priv *priv = led->priv;
> + unsigned int regval;
> + u32 level;
> + int ret;
> +
> + ret = regmap_read(priv->regmap, MT6360_REG_ISNK(led->led_no), &regval);
> + if (ret)
> + return ret;
> + level = regval & MT6360_ISNK_MASK;
> +
> + ret = regmap_read(priv->regmap, MT6360_REG_RGBEN, &regval);
> + if (ret)
> + return ret;
> +
> + if (!(regval & MT6360_ISNK_ENMASK(led->led_no)))
> + level = LED_OFF;
> +
> + switch (led->default_state) {
> + case STATE_ON:
> + led->isnk.brightness = led->isnk.max_brightness;
> + break;
> + case STATE_KEEP:
> + led->isnk.brightness = min(level, led->isnk.max_brightness);
> + break;
> + default:
> + led->isnk.brightness = LED_OFF;
> + }
> +
> + return mt6360_isnk_brightness_set(&led->isnk, led->isnk.brightness);
> +}
> +
> +static int mt6360_flash_init_default_state(struct mt6360_led *led)
> +{
> + struct led_classdev_flash *flash = &led->flash;
> + struct mt6360_priv *priv = led->priv;
> + u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> + u32 level;
> + unsigned int regval;
> + int ret;
> +
> + ret = regmap_read(priv->regmap, MT6360_REG_FLEDITOR(led->led_no), &regval);
> + if (ret)
> + return ret;
> + level = regval & MT6360_ITORCH_MASK;
> +
> + ret = regmap_read(priv->regmap, MT6360_REG_FLEDEN, &regval);
> + if (ret)
> + return ret;
> +
> + if ((regval & enable_mask) == enable_mask)
> + level += 1;

level++ fits better here.

> + else
> + level = LED_OFF;
> +
> + switch (led->default_state) {
> + case STATE_ON:
> + flash->led_cdev.brightness = flash->led_cdev.max_brightness;
> + break;
> + case STATE_KEEP:
> + flash->led_cdev.brightness = min(level, flash->led_cdev.max_brightness);
> + break;
> + default:
> + flash->led_cdev.brightness = LED_OFF;
> + }
> +
> + return mt6360_torch_brightness_set(&flash->led_cdev, flash->led_cdev.brightness);
> +}
> +
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> +static int mt6360_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
> +{
> + struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
> + struct mt6360_led *led = container_of(flash, struct mt6360_led, flash);
> + struct mt6360_priv *priv = led->priv;
> + u32 mask = MT6360_FLCSEN_MASK(led->led_no);
> + u32 val = enable ? mask : 0;
> + int ret;
> +
> + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, mask, val);
> + if (ret)
> + return ret;
> +
> + if (enable)
> + priv->fled_strobe_used |= BIT(led->led_no);
> + else
> + priv->fled_strobe_used &= ~BIT(led->led_no);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_flash_ops v4l2_flash_ops = {
> + .external_strobe_set = mt6360_flash_external_strobe_set,
> +};
> +
> +static void mt6360_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> +{
> + struct led_classdev *lcdev;
> + struct led_flash_setting *s = &config->intensity;
> +
> + switch (led->led_no) {
> + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> + lcdev = &led->isnk;
> +
> + if (led->led_no == MT6360_LED_ISNK4)
> + s->step = MT6360_ISNK4_STEPUA;
> + else
> + s->step = MT6360_ISNK1_STEPUA;
> +
> + s->min = 0;
> + s->val = lcdev->brightness * s->step;
> + s->max = lcdev->max_brightness * s->step;
> + break;
> + default:
> + lcdev = &led->flash.led_cdev;
> +
> + s->min = MT6360_ITORCH_MINUA;
> + s->step = MT6360_ITORCH_STEPUA;
> + s->val = s->max = s->min + (lcdev->max_brightness - 1) * s->step;
> +
> + config->has_external_strobe = 1;
> + }
> +
> + snprintf(config->dev_name, sizeof(config->dev_name), "%s", lcdev->name);

You're using devm_led_classdev_register_ext() so lcdev->name remains
uninitialized, but even if you used non-ext API, it wouldn't necessary
contain the final LED name, if renaming had occurred.

Please use below instead:

strscpy(config->dev_name, lcdev->dev->kobj.name, sizeof(config->dev_name));


> +}
> +#else
> +static const struct v4l2_flash_ops v4l2_flash_ops;
> +
> +static void mt6360_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> +{
> +}
> +#endif
> +
> +static int mt6360_led_register(struct device *parent, struct mt6360_led *led,
> + struct led_init_data *init_data)
> +{
> + struct mt6360_priv *priv = led->priv;
> + struct v4l2_flash_config v4l2_config = {0};
> + int ret;
> +
> + switch (led->led_no) {
> + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> + if (led->led_no == MT6360_LED_ISNK1) {
> + /* Change isink1 to SW control mode, disconnect it with charger state */
> + ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN,
> + MT6360_CHRINDSEL_MASK, MT6360_CHRINDSEL_MASK);
> + if (ret) {
> + dev_err(parent, "Failed to config ISNK1 to SW mode\n");
> + return ret;
> + }
> + }
> +
> + ret = mt6360_isnk_init_default_state(led);
> + if (ret) {
> + dev_err(parent, "Failed to init %d isnk state\n", led->led_no);
> + return ret;
> + }
> +
> + ret = devm_led_classdev_register_ext(parent, &led->isnk, init_data);
> + if (ret) {
> + dev_err(parent, "Couldn't register isink %d\n", led->led_no);
> + return ret;
> + }
> +
> + mt6360_init_v4l2_config(led, &v4l2_config);
> + led->v4l2_flash = v4l2_flash_indicator_init(parent, init_data->fwnode, &led->isnk,
> + &v4l2_config);
> + break;
> + default:
> + ret = mt6360_flash_init_default_state(led);
> + if (ret) {
> + dev_err(parent, "Failed to init %d flash state\n", led->led_no);
> + return ret;
> + }
> +
> + ret = devm_led_classdev_flash_register_ext(parent, &led->flash, init_data);
> + if (ret) {
> + dev_err(parent, "Couldn't register flash %d\n", led->led_no);
> + return ret;
> + }
> +
> + mt6360_init_v4l2_config(led, &v4l2_config);
> + led->v4l2_flash = v4l2_flash_init(parent, init_data->fwnode, &led->flash,
> + &v4l2_flash_ops, &v4l2_config);
> + }
> +
> + if (IS_ERR(led->v4l2_flash)) {
> + dev_err(parent, "Failed to register %d v4l2 sd\n", led->led_no);
> + return PTR_ERR(led->v4l2_flash);
> + }
> +
> + return 0;
> +}
> +
> +static u32 clamp_align(u32 val, u32 min, u32 max, u32 step)
> +{
> + u32 retval;
> +
> + retval = clamp_val(val, min, max);
> + if (step > 1)
> + retval = rounddown(retval - min, step) + min;
> +
> + return retval;
> +}
> +
> +static int mt6360_init_isnk_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> + struct led_classdev *isnk = &led->isnk;
> + struct mt6360_priv *priv = led->priv;
> + u32 step_uA, max_uA;
> + u32 val;
> + int ret;
> +
> + if (led->led_no == MT6360_LED_ISNK4) {
> + step_uA = MT6360_ISNK4_STEPUA;
> + max_uA = MT6360_ISNK4_MAXUA;
> + } else {
> + step_uA = MT6360_ISNK1_STEPUA;
> + max_uA = MT6360_ISNK1_MAXUA;
> + }
> +
> + ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
> + if (ret) {
> + dev_warn(priv->dev, "Not specified led-max-microamp, config to the minimum step\n");
> + val = 1 * step_uA;
> + } else
> + val = clamp_align(val, 0, max_uA, step_uA);
> +
> + isnk->max_brightness = val / step_uA;
> + isnk->brightness_set_blocking = mt6360_isnk_brightness_set;
> +
> + fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
> + &isnk->default_trigger);
> +
> + return 0;
> +}
> +
> +static int mt6360_init_flash_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> + struct led_classdev_flash *flash = &led->flash;
> + struct led_classdev *lcdev = &flash->led_cdev;
> + struct mt6360_priv *priv = led->priv;
> + struct led_flash_setting *s;
> + u32 val;
> + int ret;
> +
> + ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
> + if (ret) {
> + dev_warn(priv->dev, "Not specified led-max-microamp, config to the minimum\n");
> + val = MT6360_ITORCH_MINUA;
> + } else
> + val = clamp_align(val, MT6360_ITORCH_MINUA, MT6360_ITORCH_MAXUA,
> + MT6360_ITORCH_STEPUA);
> +
> + lcdev->max_brightness = (val - MT6360_ITORCH_MINUA) / MT6360_ITORCH_STEPUA + 1;
> + lcdev->brightness_set_blocking = mt6360_torch_brightness_set;
> + lcdev->flags |= LED_DEV_CAP_FLASH;
> +
> + ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-microamp", &val);
> + if (ret) {
> + dev_warn(priv->dev, "Not specified flash-max-microamp, config to the minimum\n");
> + val = MT6360_ISTRB_MINUA;
> + } else
> + val = clamp_align(val, MT6360_ISTRB_MINUA, MT6360_ISTRB_MAXUA, MT6360_ISTRB_STEPUA);
> +
> + s = &flash->brightness;
> + s->min = MT6360_ISTRB_MINUA;
> + s->step = MT6360_ISTRB_STEPUA;
> + s->val = s->max = val;
> +
> + /* Always configure as min level when off to prevent flash current spike */
> + ret = _mt6360_flash_brightness_set(flash, s->min);
> + if (ret)
> + return ret;
> +
> + ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-timeout-us", &val);
> + if (ret) {
> + dev_warn(priv->dev, "Not specified flash-max-timeout-us, config to the minimum\n");
> + val = MT6360_STRBTO_MINUS;
> + } else
> + val = clamp_align(val, MT6360_STRBTO_MINUS, MT6360_STRBTO_MAXUS,
> + MT6360_STRBTO_STEPUS);
> +
> + s = &flash->timeout;
> + s->min = MT6360_STRBTO_MINUS;
> + s->step = MT6360_STRBTO_STEPUS;
> + s->val = s->max = val;
> +
> + flash->ops = &mt6360_flash_ops;
> +
> + return 0;
> +}
> +
> +static int mt6360_init_common_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> + const char * const states[] = { "off", "keep", "on" };
> + const char *str;
> + int ret;
> +
> + if (!fwnode_property_read_string(init_data->fwnode, "default-state", &str)) {
> + ret = match_string(states, ARRAY_SIZE(states), str);
> + if (ret < 0)
> + ret = STATE_OFF;
> +
> + led->default_state = ret;
> + }
> +
> + return 0;
> +}
> +
> +static void mt6360_v4l2_flash_release(struct mt6360_priv *priv)
> +{
> + int i;
> +
> + for (i = 0; i < priv->leds_count; i++) {
> + struct mt6360_led *led = priv->leds + i;
> +
> + if (led->v4l2_flash)
> + v4l2_flash_release(led->v4l2_flash);
> +
> + }
> +}
> +
> +static int mt6360_led_probe(struct platform_device *pdev)
> +{
> + struct mt6360_priv *priv;
> + struct fwnode_handle *child;
> + size_t count;
> + int i = 0, ret;
> +
> + count = device_get_child_node_count(&pdev->dev);
> + if (!count || count > MT6360_MAX_LEDS)

Please add dev_err() here.

> + return -EINVAL;
> +
> + priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, count), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->leds_count = count;
> + priv->dev = &pdev->dev;
> +
> + priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!priv->regmap) {
> + dev_err(&pdev->dev, "Failed to get parent regmap\n");
> + return -ENODEV;
> + }
> +
> + device_for_each_child_node(&pdev->dev, child) {
> + struct mt6360_led *led = priv->leds + i;
> + struct led_init_data init_data = { .fwnode = child, };
> + u32 reg;
> +
> + ret = fwnode_property_read_u32(child, "reg", &reg);
> + if (ret)
> + goto out_flash_release;
> +
> + if (reg >= MT6360_MAX_LEDS || priv->leds_active & BIT(reg))
> + return -EINVAL;
> + priv->leds_active |= BIT(reg);
> +
> + led->led_no = reg;
> + led->priv = priv;
> +
> + ret = mt6360_init_common_properties(led, &init_data);
> + if (ret)
> + goto out_flash_release;
> +
> + switch (reg) {
> + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> + ret = mt6360_init_isnk_properties(led, &init_data);
> + break;
> + default:
> + ret = mt6360_init_flash_properties(led, &init_data);
> + }
> +
> + if (ret)
> + goto out_flash_release;
> +
> + ret = mt6360_led_register(&pdev->dev, led, &init_data);
> + if (ret)
> + goto out_flash_release;
> +
> + i++;
> + }
> +
> + platform_set_drvdata(pdev, priv);
> + return 0;
> +
> +out_flash_release:
> + mt6360_v4l2_flash_release(priv);
> + return ret;
> +}
> +
> +static int mt6360_led_remove(struct platform_device *pdev)
> +{
> + struct mt6360_priv *priv = platform_get_drvdata(pdev);
> +
> + mt6360_v4l2_flash_release(priv);
> + return 0;
> +}
> +
> +static const struct of_device_id __maybe_unused mt6360_led_of_id[] = {
> + { .compatible = "mediatek,mt6360-led", },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, mt6360_led_of_id);
> +
> +static struct platform_driver mt6360_led_driver = {
> + .driver = {
> + .name = "mt6360-led",
> + .of_match_table = mt6360_led_of_id,
> + },
> + .probe = mt6360_led_probe,
> + .remove = mt6360_led_remove,
> +};
> +module_platform_driver(mt6360_led_driver);
> +
> +MODULE_AUTHOR("Gene Chen <[email protected]>");
> +MODULE_DESCRIPTION("MT6360 LED Driver");
> +MODULE_LICENSE("GPL v2");
>

--
Best regards,
Jacek Anaszewski

2020-09-24 06:23:10

by Gene Chen

Subject: Re: [PATCH v4 2/2] leds: mt6360: Add LED driver for MT6360

Jacek Anaszewski <[email protected]> 於 2020年9月24日 週四 上午5:49寫道：

>
> Hi Gene,
>
> Thank you for the update. I have some more comments below.
>
> On 9/23/20 2:50 PM, Gene Chen wrote:
> > From: Gene Chen <[email protected]>
> >
> > Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> > and 4-channel RGB LED support Register/Flash/Breath Mode
> >
> > Signed-off-by: Gene Chen <[email protected]>
> > ---
> > drivers/leds/Kconfig | 11 +
> > drivers/leds/Makefile | 1 +
> > drivers/leds/leds-mt6360.c | 705 +++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 717 insertions(+)
> > create mode 100644 drivers/leds/leds-mt6360.c
> >
> > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> > index 1c181df..5561b08 100644
> > --- a/drivers/leds/Kconfig
> > +++ b/drivers/leds/Kconfig
> > @@ -271,6 +271,17 @@ config LEDS_MT6323
> > This option enables support for on-chip LED drivers found on
> > Mediatek MT6323 PMIC.
> >
> > +config LEDS_MT6360
> > + tristate "LED Support for Mediatek MT6360 PMIC"
> > + depends on LEDS_CLASS_FLASH && OF
> > + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
> > + depends on MFD_MT6360
> > + help
> > + This option enables support for dual Flash LED drivers found on
> > + Mediatek MT6360 PMIC.
> > + Independent current sources supply for each flash LED support torch
> > + and strobe mode.
> > +
> > config LEDS_S3C24XX
> > tristate "LED Support for Samsung S3C24XX GPIO LEDs"
> > depends on LEDS_CLASS
> > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> > index c2c7d7a..5596427 100644
> > --- a/drivers/leds/Makefile
> > +++ b/drivers/leds/Makefile
> > @@ -66,6 +66,7 @@ obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
> > obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
> > obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
> > obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
> > +obj-$(CONFIG_LEDS_MT6360) += leds-mt6360.o
> > obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
> > obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
> > obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
> > diff --git a/drivers/leds/leds-mt6360.c b/drivers/leds/leds-mt6360.c
> > new file mode 100644
> > index 0000000..1c3486e
> > --- /dev/null
> > +++ b/drivers/leds/leds-mt6360.c
> > @@ -0,0 +1,705 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +
> > +#include <linux/delay.h>
> > +#include <linux/init.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/kernel.h>
> > +#include <linux/led-class-flash.h>
> > +#include <linux/module.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/property.h>
> > +#include <linux/regmap.h>
> > +#include <media/v4l2-flash-led-class.h>
> > +
> > +enum {
> > + MT6360_LED_ISNK1 = 0,
> > + MT6360_LED_ISNK2,
> > + MT6360_LED_ISNK3,
> > + MT6360_LED_ISNK4,
>
> One question about these ISINKs - how are they exploited in your device?
> Are these LEDs used to indicate camera activity or it is one RGB LED
> for status? And what functionality has the remaining amber one (sticking
> to the naming from your DT bindings)?
>
> Can you share how the documenation for this device describes the purpose
> of these sinks, if it does it at all?
>
> I got probably mislead by your naming in the driver and got fixed on
> their function as camera activity indicators, for which V4L2 has
> support. If that is not the case, then you'd better switch to using
> multicolor framework for all four "indicator" LEDs.
>

It's one RGB LED for status, not for camera.

The MT6360 integrates a three-channel RGB LED driver, designed to
provide a variety of lighting effects for mobile device applications.
The RGB LED driver includes a smart LED string controller, and it can
drive 3 channels of LEDs with a sink current of up to 24mA. The
default setting of RGB_ISINK1 is auto mode for TA charging indicator,
and RGB_ISINK1 also supports software mode. It provides three
operation modes for the RGB LEDs: flash mode, breath mode, and
register mode. The device can increase or decrease the brightness of
the RGB LEDs upon command via the I2C interface. The RGB_ISINK4
provide more sink current up to 150mA, which we can moonlight mode.

Do you mean we should remove "isink register v4l2 device, only need
register ledclass device"?

> > + MT6360_LED_FLASH1,
> > + MT6360_LED_FLASH2,
> > + MT6360_MAX_LEDS
> > +};
> > +
> > +#define MT6360_REG_RGBEN 0x380
> > +#define MT6360_REG_ISNK(_led_no) (0x381 + (_led_no))
> > +#define MT6360_ISNK_ENMASK(_led_no) BIT(7 - (_led_no))
> > +#define MT6360_ISNK_MASK GENMASK(4, 0)
> > +#define MT6360_CHRINDSEL_MASK BIT(3)
> > +
> > +#define MT6360_REG_FLEDEN 0x37E
> > +#define MT6360_REG_STRBTO 0x373
> > +#define MT6360_REG_FLEDBASE(_id) (0x372 + 4 * (_id - MT6360_LED_FLASH1))
> > +#define MT6360_REG_FLEDISTRB(_id) (MT6360_REG_FLEDBASE(_id) + 2)
> > +#define MT6360_REG_FLEDITOR(_id) (MT6360_REG_FLEDBASE(_id) + 3)
> > +#define MT6360_REG_CHGSTAT2 0x3E1
> > +#define MT6360_REG_FLEDSTAT1 0x3E9
> > +#define MT6360_ITORCH_MASK GENMASK(4, 0)
> > +#define MT6360_ISTROBE_MASK GENMASK(6, 0)
> > +#define MT6360_STRBTO_MASK GENMASK(6, 0)
> > +#define MT6360_TORCHEN_MASK BIT(3)
> > +#define MT6360_STROBEN_MASK BIT(2)
> > +#define MT6360_FLCSEN_MASK(_id) BIT(MT6360_LED_FLASH2 - _id)
> > +#define MT6360_FLEDCHGVINOVP_MASK BIT(3)
> > +#define MT6360_FLED1STRBTO_MASK BIT(11)
> > +#define MT6360_FLED2STRBTO_MASK BIT(10)
> > +#define MT6360_FLED1STRB_MASK BIT(9)
> > +#define MT6360_FLED2STRB_MASK BIT(8)
> > +#define MT6360_FLED1SHORT_MASK BIT(7)
> > +#define MT6360_FLED2SHORT_MASK BIT(6)
> > +#define MT6360_FLEDLVF_MASK BIT(3)
> > +
> > +#define MT6360_ISNK1_STEPUA 2000
> > +#define MT6360_ISNK1_MAXUA 24000
> > +#define MT6360_ISNK4_STEPUA 5000
> > +#define MT6360_ISNK4_MAXUA 150000
> > +
> > +#define MT6360_ITORCH_MINUA 25000
> > +#define MT6360_ITORCH_STEPUA 12500
> > +#define MT6360_ITORCH_MAXUA 400000
> > +#define MT6360_ISTRB_MINUA 50000
> > +#define MT6360_ISTRB_STEPUA 12500
> > +#define MT6360_ISTRB_MAXUA 1500000
> > +#define MT6360_STRBTO_MINUS 64000
> > +#define MT6360_STRBTO_STEPUS 32000
> > +#define MT6360_STRBTO_MAXUS 2432000
> > +
> > +#define STATE_OFF 0
> > +#define STATE_KEEP 1
> > +#define STATE_ON 2
> > +
> > +struct mt6360_led {
> > + union {
> > + struct led_classdev isnk;
> > + struct led_classdev_flash flash;
> > + };
> > + struct v4l2_flash *v4l2_flash;
> > + struct mt6360_priv *priv;
> > + u32 led_no;
> > + u32 default_state;
> > +};
> > +
> > +struct mt6360_priv {
> > + struct device *dev;
> > + struct regmap *regmap;
> > + unsigned int fled_strobe_used;
> > + unsigned int fled_torch_used;
> > + unsigned int leds_active;
> > + unsigned int leds_count;
> > + struct mt6360_led leds[];
> > +};
> > +
> > +static int mt6360_isnk_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> > +{
> > + struct mt6360_led *led = container_of(lcdev, struct mt6360_led, isnk);
> > + struct mt6360_priv *priv = led->priv;
> > + u32 enable_mask = MT6360_ISNK_ENMASK(led->led_no);
> > + u32 val = level ? MT6360_ISNK_ENMASK(led->led_no) : 0;
> > + int ret;
>
> You meed mutex protection in all functions acessing device registers.
>

ACK

> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no),
> > + MT6360_ISNK_MASK, level);
> > + if (ret)
> > + return ret;
> > +
> > + return regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
> > +}
> > +
> > +static int mt6360_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> > +{
> > + struct mt6360_led *led = container_of(lcdev, struct mt6360_led, flash.led_cdev);
> > + struct mt6360_priv *priv = led->priv;
> > + u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> > + u32 val = level ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> > + u32 prev = priv->fled_torch_used, curr;
>
> Above assignment must be made under mutex.
>

ACK

> > + int ret;
> > +
> > + /* Only one set of flash control logic, use the flag to avoid strobe is currently used */
> > + if (priv->fled_strobe_used) {
> > + dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
> > + return -EBUSY;
> > + }
> > +
> > + if (level)
> > + curr = prev | BIT(led->led_no);
> > + else
> > + curr = prev & ~BIT(led->led_no);
> > +
> > + if (curr)
> > + val |= MT6360_TORCHEN_MASK;
> > +
> > + if (level) {
> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDITOR(led->led_no),
> > + MT6360_ITORCH_MASK, level - 1);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
> > + if (ret)
> > + return ret;
> > +
> > + priv->fled_torch_used = curr;
>
> Ditto. And everything between as well of course.
>

ACK

> > +
> > + return 0;
> > +}
> > +
> > +static int mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> > +{
> > + /*
> > + * Due to the current spike when turning on flash, only let brightness keep by framework
>
> s/keep by/to be kept/
>
> > + * This empty function is used to prevent led_classdev_flash register ops check
>
> s/led_classdev_flash/led_classdev_flash()/
> s/check/check failure/
>
> And please put dots at the end of sentences.
>

ACK

> > + */
> > + return 0;
> > +}
> > +
> > +static int _mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> > +{
> > + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> > + struct mt6360_priv *priv = led->priv;
> > + struct led_flash_setting *s = &fl_cdev->brightness;
> > + u32 val = (brightness - s->min) / s->step;
> > +
> > + return regmap_update_bits(priv->regmap, MT6360_REG_FLEDISTRB(led->led_no),
> > + MT6360_ISTROBE_MASK, val);
> > +}
> > +
> > +static int mt6360_strobe_set(struct led_classdev_flash *fl_cdev, bool state)
> > +{
> > + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> > + struct mt6360_priv *priv = led->priv;
> > + struct led_classdev *lcdev = &fl_cdev->led_cdev;
> > + struct led_flash_setting *s = &fl_cdev->brightness;
> > + u32 enable_mask = MT6360_STROBEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> > + u32 val = state ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> > + u32 prev = priv->fled_strobe_used, curr;
> > + int ret;
> > +
> > + /* Only one set of flash control logic, use the flag to avoid torch is currently used */
> > + if (priv->fled_torch_used) {
> > + dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", priv->fled_torch_used);
> > + return -EBUSY;
> > + }
> > +
> > + if (state)
> > + curr = prev | BIT(led->led_no);
> > + else
> > + curr = prev & ~BIT(led->led_no);
> > +
> > + if (curr)
> > + val |= MT6360_STROBEN_MASK;
> > +
> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
> > + if (ret) {
> > + dev_err(lcdev->dev, "[%d] control current source %d fail\n", led->led_no, state);
> > + return ret;
> > + }
> > +
> > + /*
> > + * If the flash need to be on, config the flash current ramping up to the setting value
> > + * Else, always recover back to the minimum one
> > + */
> > + ret = _mt6360_flash_brightness_set(fl_cdev, state ? s->val : s->min);
> > + if (ret)
> > + return ret;
> > +
> > + /* For the flash turn on/off, HW rampping up/down time is 5ms/500us, respectively */
> > + if (!prev && curr)
> > + usleep_range(5000, 6000);
> > + else if (prev && !curr)
> > + udelay(500);
> > +
> > + priv->fled_strobe_used = curr;
> > + return 0;
> > +}
> > +
> > +static int mt6360_strobe_get(struct led_classdev_flash *fl_cdev, bool *state)
> > +{
> > + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> > + struct mt6360_priv *priv = led->priv;
> > +
> > + *state = !!(priv->fled_strobe_used & BIT(led->led_no));
> > + return 0;
> > +}
> > +
> > +static int mt6360_timeout_set(struct led_classdev_flash *fl_cdev, u32 timeout)
> > +{
> > + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> > + struct mt6360_priv *priv = led->priv;
> > + struct led_flash_setting *s = &fl_cdev->timeout;
> > + u32 val = (timeout - s->min) / s->step;
> > +
> > + return regmap_update_bits(priv->regmap, MT6360_REG_STRBTO, MT6360_STRBTO_MASK, val);
> > +
> > +}
> > +
> > +static int mt6360_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
> > +{
> > + struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> > + struct mt6360_priv *priv = led->priv;
> > + u16 fled_stat;
> > + unsigned int chg_stat, strobe_timeout_mask, fled_short_mask;
> > + u32 rfault = 0;
> > + int ret;
> > +
> > + ret = regmap_read(priv->regmap, MT6360_REG_CHGSTAT2, &chg_stat);
> > + if (ret)
> > + return ret;
> > +
> > + ret = regmap_raw_read(priv->regmap, MT6360_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
> > + if (ret)
> > + return ret;
> > +
> > + if (led->led_no == MT6360_LED_FLASH1) {
> > + strobe_timeout_mask = MT6360_FLED1STRBTO_MASK;
> > + fled_short_mask = MT6360_FLED1SHORT_MASK;
> > + } else {
> > + strobe_timeout_mask = MT6360_FLED2STRBTO_MASK;
> > + fled_short_mask = MT6360_FLED2SHORT_MASK;
> > + }
> > +
> > + if (chg_stat & MT6360_FLEDCHGVINOVP_MASK)
> > + rfault |= LED_FAULT_INPUT_VOLTAGE;
> > +
> > + if (fled_stat & strobe_timeout_mask)
> > + rfault |= LED_FAULT_TIMEOUT;
> > +
> > + if (fled_stat & fled_short_mask)
> > + rfault |= LED_FAULT_SHORT_CIRCUIT;
> > +
> > + if (fled_stat & MT6360_FLEDLVF_MASK)
> > + rfault |= LED_FAULT_UNDER_VOLTAGE;
> > +
> > + *fault = rfault;
> > + return 0;
> > +}
> > +
> > +static const struct led_flash_ops mt6360_flash_ops = {
> > + .flash_brightness_set = mt6360_flash_brightness_set,
> > + .strobe_set = mt6360_strobe_set,
> > + .strobe_get = mt6360_strobe_get,
> > + .timeout_set = mt6360_timeout_set,
> > + .fault_get = mt6360_fault_get,
> > +};
> > +
> > +static int mt6360_isnk_init_default_state(struct mt6360_led *led)
> > +{
> > + struct mt6360_priv *priv = led->priv;
> > + unsigned int regval;
> > + u32 level;
> > + int ret;
> > +
> > + ret = regmap_read(priv->regmap, MT6360_REG_ISNK(led->led_no), &regval);
> > + if (ret)
> > + return ret;
> > + level = regval & MT6360_ISNK_MASK;
> > +
> > + ret = regmap_read(priv->regmap, MT6360_REG_RGBEN, &regval);
> > + if (ret)
> > + return ret;
> > +
> > + if (!(regval & MT6360_ISNK_ENMASK(led->led_no)))
> > + level = LED_OFF;
> > +
> > + switch (led->default_state) {
> > + case STATE_ON:
> > + led->isnk.brightness = led->isnk.max_brightness;
> > + break;
> > + case STATE_KEEP:
> > + led->isnk.brightness = min(level, led->isnk.max_brightness);
> > + break;
> > + default:
> > + led->isnk.brightness = LED_OFF;
> > + }
> > +
> > + return mt6360_isnk_brightness_set(&led->isnk, led->isnk.brightness);
> > +}
> > +
> > +static int mt6360_flash_init_default_state(struct mt6360_led *led)
> > +{
> > + struct led_classdev_flash *flash = &led->flash;
> > + struct mt6360_priv *priv = led->priv;
> > + u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> > + u32 level;
> > + unsigned int regval;
> > + int ret;
> > +
> > + ret = regmap_read(priv->regmap, MT6360_REG_FLEDITOR(led->led_no), &regval);
> > + if (ret)
> > + return ret;
> > + level = regval & MT6360_ITORCH_MASK;
> > +
> > + ret = regmap_read(priv->regmap, MT6360_REG_FLEDEN, &regval);
> > + if (ret)
> > + return ret;
> > +
> > + if ((regval & enable_mask) == enable_mask)
> > + level += 1;
>
> level++ fits better here.
>

ACK

> > + else
> > + level = LED_OFF;
> > +
> > + switch (led->default_state) {
> > + case STATE_ON:
> > + flash->led_cdev.brightness = flash->led_cdev.max_brightness;
> > + break;
> > + case STATE_KEEP:
> > + flash->led_cdev.brightness = min(level, flash->led_cdev.max_brightness);
> > + break;
> > + default:
> > + flash->led_cdev.brightness = LED_OFF;
> > + }
> > +
> > + return mt6360_torch_brightness_set(&flash->led_cdev, flash->led_cdev.brightness);
> > +}
> > +
> > +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> > +static int mt6360_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
> > +{
> > + struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
> > + struct mt6360_led *led = container_of(flash, struct mt6360_led, flash);
> > + struct mt6360_priv *priv = led->priv;
> > + u32 mask = MT6360_FLCSEN_MASK(led->led_no);
> > + u32 val = enable ? mask : 0;
> > + int ret;
> > +
> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, mask, val);
> > + if (ret)
> > + return ret;
> > +
> > + if (enable)
> > + priv->fled_strobe_used |= BIT(led->led_no);
> > + else
> > + priv->fled_strobe_used &= ~BIT(led->led_no);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct v4l2_flash_ops v4l2_flash_ops = {
> > + .external_strobe_set = mt6360_flash_external_strobe_set,
> > +};
> > +
> > +static void mt6360_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> > +{
> > + struct led_classdev *lcdev;
> > + struct led_flash_setting *s = &config->intensity;
> > +
> > + switch (led->led_no) {
> > + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> > + lcdev = &led->isnk;
> > +
> > + if (led->led_no == MT6360_LED_ISNK4)
> > + s->step = MT6360_ISNK4_STEPUA;
> > + else
> > + s->step = MT6360_ISNK1_STEPUA;
> > +
> > + s->min = 0;
> > + s->val = lcdev->brightness * s->step;
> > + s->max = lcdev->max_brightness * s->step;
> > + break;
> > + default:
> > + lcdev = &led->flash.led_cdev;
> > +
> > + s->min = MT6360_ITORCH_MINUA;
> > + s->step = MT6360_ITORCH_STEPUA;
> > + s->val = s->max = s->min + (lcdev->max_brightness - 1) * s->step;
> > +
> > + config->has_external_strobe = 1;
> > + }
> > +
> > + snprintf(config->dev_name, sizeof(config->dev_name), "%s", lcdev->name);
>
> You're using devm_led_classdev_register_ext() so lcdev->name remains
> uninitialized, but even if you used non-ext API, it wouldn't necessary
> contain the final LED name, if renaming had occurred.
>
> Please use below instead:
>
> strscpy(config->dev_name, lcdev->dev->kobj.name, sizeof(config->dev_name));
>
>

ACK

> > +}
> > +#else
> > +static const struct v4l2_flash_ops v4l2_flash_ops;
> > +
> > +static void mt6360_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> > +{
> > +}
> > +#endif
> > +
> > +static int mt6360_led_register(struct device *parent, struct mt6360_led *led,
> > + struct led_init_data *init_data)
> > +{
> > + struct mt6360_priv *priv = led->priv;
> > + struct v4l2_flash_config v4l2_config = {0};
> > + int ret;
> > +
> > + switch (led->led_no) {
> > + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> > + if (led->led_no == MT6360_LED_ISNK1) {
> > + /* Change isink1 to SW control mode, disconnect it with charger state */
> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN,
> > + MT6360_CHRINDSEL_MASK, MT6360_CHRINDSEL_MASK);
> > + if (ret) {
> > + dev_err(parent, "Failed to config ISNK1 to SW mode\n");
> > + return ret;
> > + }
> > + }
> > +
> > + ret = mt6360_isnk_init_default_state(led);
> > + if (ret) {
> > + dev_err(parent, "Failed to init %d isnk state\n", led->led_no);
> > + return ret;
> > + }
> > +
> > + ret = devm_led_classdev_register_ext(parent, &led->isnk, init_data);
> > + if (ret) {
> > + dev_err(parent, "Couldn't register isink %d\n", led->led_no);
> > + return ret;
> > + }
> > +
> > + mt6360_init_v4l2_config(led, &v4l2_config);
> > + led->v4l2_flash = v4l2_flash_indicator_init(parent, init_data->fwnode, &led->isnk,
> > + &v4l2_config);
> > + break;
> > + default:
> > + ret = mt6360_flash_init_default_state(led);
> > + if (ret) {
> > + dev_err(parent, "Failed to init %d flash state\n", led->led_no);
> > + return ret;
> > + }
> > +
> > + ret = devm_led_classdev_flash_register_ext(parent, &led->flash, init_data);
> > + if (ret) {
> > + dev_err(parent, "Couldn't register flash %d\n", led->led_no);
> > + return ret;
> > + }
> > +
> > + mt6360_init_v4l2_config(led, &v4l2_config);
> > + led->v4l2_flash = v4l2_flash_init(parent, init_data->fwnode, &led->flash,
> > + &v4l2_flash_ops, &v4l2_config);
> > + }
> > +
> > + if (IS_ERR(led->v4l2_flash)) {
> > + dev_err(parent, "Failed to register %d v4l2 sd\n", led->led_no);
> > + return PTR_ERR(led->v4l2_flash);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static u32 clamp_align(u32 val, u32 min, u32 max, u32 step)
> > +{
> > + u32 retval;
> > +
> > + retval = clamp_val(val, min, max);
> > + if (step > 1)
> > + retval = rounddown(retval - min, step) + min;
> > +
> > + return retval;
> > +}
> > +
> > +static int mt6360_init_isnk_properties(struct mt6360_led *led, struct led_init_data *init_data)
> > +{
> > + struct led_classdev *isnk = &led->isnk;
> > + struct mt6360_priv *priv = led->priv;
> > + u32 step_uA, max_uA;
> > + u32 val;
> > + int ret;
> > +
> > + if (led->led_no == MT6360_LED_ISNK4) {
> > + step_uA = MT6360_ISNK4_STEPUA;
> > + max_uA = MT6360_ISNK4_MAXUA;
> > + } else {
> > + step_uA = MT6360_ISNK1_STEPUA;
> > + max_uA = MT6360_ISNK1_MAXUA;
> > + }
> > +
> > + ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
> > + if (ret) {
> > + dev_warn(priv->dev, "Not specified led-max-microamp, config to the minimum step\n");
> > + val = 1 * step_uA;
> > + } else
> > + val = clamp_align(val, 0, max_uA, step_uA);
> > +
> > + isnk->max_brightness = val / step_uA;
> > + isnk->brightness_set_blocking = mt6360_isnk_brightness_set;
> > +
> > + fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
> > + &isnk->default_trigger);
> > +
> > + return 0;
> > +}
> > +
> > +static int mt6360_init_flash_properties(struct mt6360_led *led, struct led_init_data *init_data)
> > +{
> > + struct led_classdev_flash *flash = &led->flash;
> > + struct led_classdev *lcdev = &flash->led_cdev;
> > + struct mt6360_priv *priv = led->priv;
> > + struct led_flash_setting *s;
> > + u32 val;
> > + int ret;
> > +
> > + ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
> > + if (ret) {
> > + dev_warn(priv->dev, "Not specified led-max-microamp, config to the minimum\n");
> > + val = MT6360_ITORCH_MINUA;
> > + } else
> > + val = clamp_align(val, MT6360_ITORCH_MINUA, MT6360_ITORCH_MAXUA,
> > + MT6360_ITORCH_STEPUA);
> > +
> > + lcdev->max_brightness = (val - MT6360_ITORCH_MINUA) / MT6360_ITORCH_STEPUA + 1;
> > + lcdev->brightness_set_blocking = mt6360_torch_brightness_set;
> > + lcdev->flags |= LED_DEV_CAP_FLASH;
> > +
> > + ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-microamp", &val);
> > + if (ret) {
> > + dev_warn(priv->dev, "Not specified flash-max-microamp, config to the minimum\n");
> > + val = MT6360_ISTRB_MINUA;
> > + } else
> > + val = clamp_align(val, MT6360_ISTRB_MINUA, MT6360_ISTRB_MAXUA, MT6360_ISTRB_STEPUA);
> > +
> > + s = &flash->brightness;
> > + s->min = MT6360_ISTRB_MINUA;
> > + s->step = MT6360_ISTRB_STEPUA;
> > + s->val = s->max = val;
> > +
> > + /* Always configure as min level when off to prevent flash current spike */
> > + ret = _mt6360_flash_brightness_set(flash, s->min);
> > + if (ret)
> > + return ret;
> > +
> > + ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-timeout-us", &val);
> > + if (ret) {
> > + dev_warn(priv->dev, "Not specified flash-max-timeout-us, config to the minimum\n");
> > + val = MT6360_STRBTO_MINUS;
> > + } else
> > + val = clamp_align(val, MT6360_STRBTO_MINUS, MT6360_STRBTO_MAXUS,
> > + MT6360_STRBTO_STEPUS);
> > +
> > + s = &flash->timeout;
> > + s->min = MT6360_STRBTO_MINUS;
> > + s->step = MT6360_STRBTO_STEPUS;
> > + s->val = s->max = val;
> > +
> > + flash->ops = &mt6360_flash_ops;
> > +
> > + return 0;
> > +}
> > +
> > +static int mt6360_init_common_properties(struct mt6360_led *led, struct led_init_data *init_data)
> > +{
> > + const char * const states[] = { "off", "keep", "on" };
> > + const char *str;
> > + int ret;
> > +
> > + if (!fwnode_property_read_string(init_data->fwnode, "default-state", &str)) {
> > + ret = match_string(states, ARRAY_SIZE(states), str);
> > + if (ret < 0)
> > + ret = STATE_OFF;
> > +
> > + led->default_state = ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static void mt6360_v4l2_flash_release(struct mt6360_priv *priv)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < priv->leds_count; i++) {
> > + struct mt6360_led *led = priv->leds + i;
> > +
> > + if (led->v4l2_flash)
> > + v4l2_flash_release(led->v4l2_flash);
> > +
> > + }
> > +}
> > +
> > +static int mt6360_led_probe(struct platform_device *pdev)
> > +{
> > + struct mt6360_priv *priv;
> > + struct fwnode_handle *child;
> > + size_t count;
> > + int i = 0, ret;
> > +
> > + count = device_get_child_node_count(&pdev->dev);
> > + if (!count || count > MT6360_MAX_LEDS)
>
> Please add dev_err() here.
>

dev_err(&pdev->dev, "No child node or node count over max led number
%d\n", count);

> > + return -EINVAL;
> > +
> > + priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, count), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + priv->leds_count = count;
> > + priv->dev = &pdev->dev;
> > +
> > + priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> > + if (!priv->regmap) {
> > + dev_err(&pdev->dev, "Failed to get parent regmap\n");
> > + return -ENODEV;
> > + }
> > +
> > + device_for_each_child_node(&pdev->dev, child) {
> > + struct mt6360_led *led = priv->leds + i;
> > + struct led_init_data init_data = { .fwnode = child, };
> > + u32 reg;
> > +
> > + ret = fwnode_property_read_u32(child, "reg", &reg);
> > + if (ret)
> > + goto out_flash_release;
> > +
> > + if (reg >= MT6360_MAX_LEDS || priv->leds_active & BIT(reg))
> > + return -EINVAL;
> > + priv->leds_active |= BIT(reg);
> > +
> > + led->led_no = reg;
> > + led->priv = priv;
> > +
> > + ret = mt6360_init_common_properties(led, &init_data);
> > + if (ret)
> > + goto out_flash_release;
> > +
> > + switch (reg) {
> > + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> > + ret = mt6360_init_isnk_properties(led, &init_data);
> > + break;
> > + default:
> > + ret = mt6360_init_flash_properties(led, &init_data);
> > + }
> > +
> > + if (ret)
> > + goto out_flash_release;
> > +
> > + ret = mt6360_led_register(&pdev->dev, led, &init_data);
> > + if (ret)
> > + goto out_flash_release;
> > +
> > + i++;
> > + }
> > +
> > + platform_set_drvdata(pdev, priv);
> > + return 0;
> > +
> > +out_flash_release:
> > + mt6360_v4l2_flash_release(priv);
> > + return ret;
> > +}
> > +
> > +static int mt6360_led_remove(struct platform_device *pdev)
> > +{
> > + struct mt6360_priv *priv = platform_get_drvdata(pdev);
> > +
> > + mt6360_v4l2_flash_release(priv);
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id __maybe_unused mt6360_led_of_id[] = {
> > + { .compatible = "mediatek,mt6360-led", },
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(of, mt6360_led_of_id);
> > +
> > +static struct platform_driver mt6360_led_driver = {
> > + .driver = {
> > + .name = "mt6360-led",
> > + .of_match_table = mt6360_led_of_id,
> > + },
> > + .probe = mt6360_led_probe,
> > + .remove = mt6360_led_remove,
> > +};
> > +module_platform_driver(mt6360_led_driver);
> > +
> > +MODULE_AUTHOR("Gene Chen <[email protected]>");
> > +MODULE_DESCRIPTION("MT6360 LED Driver");
> > +MODULE_LICENSE("GPL v2");
> >
>
> --
> Best regards,
> Jacek Anaszewski

2020-09-24 21:51:39

by Jacek Anaszewski

Subject: Re: [PATCH v4 2/2] leds: mt6360: Add LED driver for MT6360

On 9/24/20 8:21 AM, Gene Chen wrote:
> Jacek Anaszewski <[email protected]> 於 2020年9月24日 週四 上午5:49寫道：
>
>>
>> Hi Gene,
>>
>> Thank you for the update. I have some more comments below.
>>
>> On 9/23/20 2:50 PM, Gene Chen wrote:
>>> From: Gene Chen <[email protected]>
>>>
>>> Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
>>> and 4-channel RGB LED support Register/Flash/Breath Mode
>>>
>>> Signed-off-by: Gene Chen <[email protected]>
>>> ---
>>> drivers/leds/Kconfig | 11 +
>>> drivers/leds/Makefile | 1 +
>>> drivers/leds/leds-mt6360.c | 705 +++++++++++++++++++++++++++++++++++++++++++++
>>> 3 files changed, 717 insertions(+)
>>> create mode 100644 drivers/leds/leds-mt6360.c
>>>
>>> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
>>> index 1c181df..5561b08 100644
>>> --- a/drivers/leds/Kconfig
>>> +++ b/drivers/leds/Kconfig
>>> @@ -271,6 +271,17 @@ config LEDS_MT6323
>>> This option enables support for on-chip LED drivers found on
>>> Mediatek MT6323 PMIC.
>>>
>>> +config LEDS_MT6360
>>> + tristate "LED Support for Mediatek MT6360 PMIC"
>>> + depends on LEDS_CLASS_FLASH && OF
>>> + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
>>> + depends on MFD_MT6360
>>> + help
>>> + This option enables support for dual Flash LED drivers found on
>>> + Mediatek MT6360 PMIC.
>>> + Independent current sources supply for each flash LED support torch
>>> + and strobe mode.
>>> +
>>> config LEDS_S3C24XX
>>> tristate "LED Support for Samsung S3C24XX GPIO LEDs"
>>> depends on LEDS_CLASS
>>> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
>>> index c2c7d7a..5596427 100644
>>> --- a/drivers/leds/Makefile
>>> +++ b/drivers/leds/Makefile
>>> @@ -66,6 +66,7 @@ obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
>>> obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o
>>> obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o
>>> obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o
>>> +obj-$(CONFIG_LEDS_MT6360) += leds-mt6360.o
>>> obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
>>> obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
>>> obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o
>>> diff --git a/drivers/leds/leds-mt6360.c b/drivers/leds/leds-mt6360.c
>>> new file mode 100644
>>> index 0000000..1c3486e
>>> --- /dev/null
>>> +++ b/drivers/leds/leds-mt6360.c
>>> @@ -0,0 +1,705 @@
>>> +// SPDX-License-Identifier: GPL-2.0-only
>>> +
>>> +#include <linux/delay.h>
>>> +#include <linux/init.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/kernel.h>
>>> +#include <linux/led-class-flash.h>
>>> +#include <linux/module.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/property.h>
>>> +#include <linux/regmap.h>
>>> +#include <media/v4l2-flash-led-class.h>
>>> +
>>> +enum {
>>> + MT6360_LED_ISNK1 = 0,
>>> + MT6360_LED_ISNK2,
>>> + MT6360_LED_ISNK3,
>>> + MT6360_LED_ISNK4,
>>
>> One question about these ISINKs - how are they exploited in your device?
>> Are these LEDs used to indicate camera activity or it is one RGB LED
>> for status? And what functionality has the remaining amber one (sticking
>> to the naming from your DT bindings)?
>>
>> Can you share how the documenation for this device describes the purpose
>> of these sinks, if it does it at all?
>>
>> I got probably mislead by your naming in the driver and got fixed on
>> their function as camera activity indicators, for which V4L2 has
>> support. If that is not the case, then you'd better switch to using
>> multicolor framework for all four "indicator" LEDs.
>>
>
> It's one RGB LED for status, not for camera.
>
> The MT6360 integrates a three-channel RGB LED driver, designed to
> provide a variety of lighting effects for mobile device applications.
> The RGB LED driver includes a smart LED string controller, and it can
> drive 3 channels of LEDs with a sink current of up to 24mA. The
> default setting of RGB_ISINK1 is auto mode for TA charging indicator,
> and RGB_ISINK1 also supports software mode. It provides three
> operation modes for the RGB LEDs: flash mode, breath mode, and
> register mode. The device can increase or decrease the brightness of
> the RGB LEDs upon command via the I2C interface. The RGB_ISINK4
> provide more sink current up to 150mA, which we can moonlight mode.
>
> Do you mean we should remove "isink register v4l2 device, only need
> register ledclass device"?

I'd say that in addition to the LED flash class device, you should
allow for registering LED multicolor device comprising RGB LEDs,
and one LED class device for ISINK4 (you could even add
LED_FUNCTION_MOONLIGHT for it).

I wonder what others think.

[...]
>>> +static int mt6360_led_probe(struct platform_device *pdev)
>>> +{
>>> + struct mt6360_priv *priv;
>>> + struct fwnode_handle *child;
>>> + size_t count;
>>> + int i = 0, ret;
>>> +
>>> + count = device_get_child_node_count(&pdev->dev);
>>> + if (!count || count > MT6360_MAX_LEDS)
>>
>> Please add dev_err() here.
>>
>
> dev_err(&pdev->dev, "No child node or node count over max led number
> %d\n", count);

If we will exploit also LED multicolor class then DT bindings will
look different, so let's discuss this detail later.

--
Best regards,
Jacek Anaszewski

2020-09-28 18:45:54

by Rob Herring

Subject: Re: [PATCH v4 1/2] dt-bindings: leds: Add bindings for MT6360 LED

On Wed, Sep 23, 2020 at 08:50:51PM +0800, Gene Chen wrote:
> From: Gene Chen <[email protected]>
>
> Add bindings document for LED support on MT6360 PMIC
>
> Signed-off-by: Gene Chen <[email protected]>
> ---
> .../devicetree/bindings/leds/leds-mt6360.yaml | 107 +++++++++++++++++++++
> 1 file changed, 107 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/leds/leds-mt6360.yaml
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-mt6360.yaml b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> new file mode 100644
> index 0000000..a356a1f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> @@ -0,0 +1,107 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-mt6360.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LED driver for MT6360 PMIC from MediaTek Integrated.

Where's the PMIC schema? This file needs to be referenced from it and
that means it all needs to be one series.

> +
> +maintainers:
> + - Gene Chen <[email protected]>
> +
> +description: |
> + This module is part of the MT6360 MFD device.
> + Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> + and 4-channel RGB LED support Register/Flash/Breath Mode
> +
> +properties:
> + compatible:
> + const: mediatek,mt6360-led
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> +patternProperties:
> + "^led@[0-5]$":
> + type: object
> + $ref: common.yaml#
> + description:
> + Properties for a single LED.
> +
> + properties:
> + reg:
> + description: Index of the LED.
> + enum:
> + - 0 # LED output INDICATOR1
> + - 1 # LED output INDICATOR2
> + - 2 # LED output INDICATOR3
> + - 3 # LED output INDICATOR4
> + - 4 # LED output FLED1
> + - 5 # LED output FLED2
> +
> +unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - "#address-cells"
> + - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/leds/common.h>
> + led-controller {
> + compatible = "mediatek,mt6360-led";
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + led@0 {
> + reg = <0>;
> + function = LED_FUNCTION_INDICATOR;
> + color = <LED_COLOR_ID_RED>;
> + default-state = "off";
> + };
> + led@1 {
> + reg = <1>;
> + function = LED_FUNCTION_INDICATOR;
> + color = <LED_COLOR_ID_GREEN>;
> + default-state = "off";
> + };
> + led@2 {
> + reg = <2>;
> + function = LED_FUNCTION_INDICATOR;
> + color = <LED_COLOR_ID_BLUE>;
> + default-state = "off";
> + };
> + led@3 {
> + reg = <3>;
> + function = LED_FUNCTION_INDICATOR;
> + color = <LED_COLOR_ID_AMBER>;
> + default-state = "off";
> + };
> + led@4 {
> + reg = <4>;
> + function = LED_FUNCTION_FLASH;
> + color = <LED_COLOR_ID_WHITE>;
> + function-enumerator = <1>;
> + default-state = "off";
> + led-max-microamp = <200000>;
> + flash-max-microamp = <500000>;
> + flash-max-timeout-us = <1024000>;
> + };
> + led@5 {
> + reg = <5>;
> + function = LED_FUNCTION_FLASH;
> + color = <LED_COLOR_ID_WHITE>;
> + function-enumerator = <2>;
> + default-state = "off";
> + led-max-microamp = <200000>;
> + flash-max-microamp = <500000>;
> + flash-max-timeout-us = <1024000>;
> + };
> + };
> +...
> --
> 2.7.4
>

2020-09-30 07:19:20

by Gene Chen

Subject: Re: [PATCH v4 1/2] dt-bindings: leds: Add bindings for MT6360 LED

Rob Herring <[email protected]> 於 2020年9月29日 週二 上午2:44寫道：
>
> On Wed, Sep 23, 2020 at 08:50:51PM +0800, Gene Chen wrote:
> > From: Gene Chen <[email protected]>
> >
> > Add bindings document for LED support on MT6360 PMIC
> >
> > Signed-off-by: Gene Chen <[email protected]>
> > ---
> > .../devicetree/bindings/leds/leds-mt6360.yaml | 107 +++++++++++++++++++++
> > 1 file changed, 107 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/leds/leds-mt6360.yaml b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> > new file mode 100644
> > index 0000000..a356a1f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> > @@ -0,0 +1,107 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/leds/leds-mt6360.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: LED driver for MT6360 PMIC from MediaTek Integrated.
>
> Where's the PMIC schema? This file needs to be referenced from it and
> that means it all needs to be one series.
>

Do you means as regulator/max77650-regulator.yaml?

description: |
This module is part of the MAX77650 MFD device. For more details
"see Documentation/devicetree/bindings/mfd/max77650.yaml"

> > +
> > +maintainers:
> > + - Gene Chen <[email protected]>
> > +
> > +description: |
> > + This module is part of the MT6360 MFD device.
> > + Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> > + and 4-channel RGB LED support Register/Flash/Breath Mode
> > +
> > +properties:
> > + compatible:
> > + const: mediatek,mt6360-led
> > +
> > + "#address-cells":
> > + const: 1
> > +
> > + "#size-cells":
> > + const: 0
> > +
> > +patternProperties:
> > + "^led@[0-5]$":
> > + type: object
> > + $ref: common.yaml#
> > + description:
> > + Properties for a single LED.
> > +
> > + properties:
> > + reg:
> > + description: Index of the LED.
> > + enum:
> > + - 0 # LED output INDICATOR1
> > + - 1 # LED output INDICATOR2
> > + - 2 # LED output INDICATOR3
> > + - 3 # LED output INDICATOR4
> > + - 4 # LED output FLED1
> > + - 5 # LED output FLED2
> > +
> > +unevaluatedProperties: false
> > +
> > +required:
> > + - compatible
> > + - "#address-cells"
> > + - "#size-cells"
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + #include <dt-bindings/leds/common.h>
> > + led-controller {
> > + compatible = "mediatek,mt6360-led";
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + led@0 {
> > + reg = <0>;
> > + function = LED_FUNCTION_INDICATOR;
> > + color = <LED_COLOR_ID_RED>;
> > + default-state = "off";
> > + };
> > + led@1 {
> > + reg = <1>;
> > + function = LED_FUNCTION_INDICATOR;
> > + color = <LED_COLOR_ID_GREEN>;
> > + default-state = "off";
> > + };
> > + led@2 {
> > + reg = <2>;
> > + function = LED_FUNCTION_INDICATOR;
> > + color = <LED_COLOR_ID_BLUE>;
> > + default-state = "off";
> > + };
> > + led@3 {
> > + reg = <3>;
> > + function = LED_FUNCTION_INDICATOR;
> > + color = <LED_COLOR_ID_AMBER>;
> > + default-state = "off";
> > + };
> > + led@4 {
> > + reg = <4>;
> > + function = LED_FUNCTION_FLASH;
> > + color = <LED_COLOR_ID_WHITE>;
> > + function-enumerator = <1>;
> > + default-state = "off";
> > + led-max-microamp = <200000>;
> > + flash-max-microamp = <500000>;
> > + flash-max-timeout-us = <1024000>;
> > + };
> > + led@5 {
> > + reg = <5>;
> > + function = LED_FUNCTION_FLASH;
> > + color = <LED_COLOR_ID_WHITE>;
> > + function-enumerator = <2>;
> > + default-state = "off";
> > + led-max-microamp = <200000>;
> > + flash-max-microamp = <500000>;
> > + flash-max-timeout-us = <1024000>;
> > + };
> > + };
> > +...
> > --
> > 2.7.4
> >

2020-09-30 10:14:23

by Gene Chen

Subject: Re: [PATCH v4 1/2] dt-bindings: leds: Add bindings for MT6360 LED

Gene Chen <[email protected]> 於 2020年9月30日 週三 下午11:17寫道：
>
> Rob Herring <[email protected]> 於 2020年9月29日 週二 上午2:44寫道：
> >
> > On Wed, Sep 23, 2020 at 08:50:51PM +0800, Gene Chen wrote:
> > > From: Gene Chen <[email protected]>
> > >
> > > Add bindings document for LED support on MT6360 PMIC
> > >
> > > Signed-off-by: Gene Chen <[email protected]>
> > > ---
> > > .../devicetree/bindings/leds/leds-mt6360.yaml | 107 +++++++++++++++++++++
> > > 1 file changed, 107 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/leds/leds-mt6360.yaml b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> > > new file mode 100644
> > > index 0000000..a356a1f
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/leds/leds-mt6360.yaml
> > > @@ -0,0 +1,107 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/leds/leds-mt6360.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: LED driver for MT6360 PMIC from MediaTek Integrated.
> >
> > Where's the PMIC schema? This file needs to be referenced from it and
> > that means it all needs to be one series.
> >
>
> Do you means as regulator/max77650-regulator.yaml?
>
> description: |
> This module is part of the MAX77650 MFD device. For more details
> "see Documentation/devicetree/bindings/mfd/max77650.yaml"
>

According to jacek suggestion, I merge fled0~2 to one RGB multicolor
device as below,
led@0 {
reg = <0>;
function = LED_FUNCTION_INDICATOR;
color = <LED_COLOR_ID_RGB>;
led-max-microamp = <24000>;
};

But I see make dt_binding_check error,
/media/gene_chen/WD/upstream/linux/Documentation/devicetree/bindings/leds/leds-mt6360.example.dt.yaml:
led-controller: led@0:color:0:0: 9 is greater than the maximum of 8

Maybe the maximum color need set from 8 to 9, which define
LED_COLOR_ID_RGB in include/dt-bindings/leds/common.h
color:
description:
Color of the LED. Use one of the LED_COLOR_ID_* prefixed definitions from
the header include/dt-bindings/leds/common.h. If there is no
matching
LED_COLOR_ID available, add a new one.
$ref: /schemas/types.yaml#definitions/uint32
minimum: 0
maximum: 9

> > > +
> > > +maintainers:
> > > + - Gene Chen <[email protected]>
> > > +
> > > +description: |
> > > + This module is part of the MT6360 MFD device.
> > > + Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> > > + and 4-channel RGB LED support Register/Flash/Breath Mode
> > > +
> > > +properties:
> > > + compatible:
> > > + const: mediatek,mt6360-led
> > > +
> > > + "#address-cells":
> > > + const: 1
> > > +
> > > + "#size-cells":
> > > + const: 0
> > > +
> > > +patternProperties:
> > > + "^led@[0-5]$":
> > > + type: object
> > > + $ref: common.yaml#
> > > + description:
> > > + Properties for a single LED.
> > > +
> > > + properties:
> > > + reg:
> > > + description: Index of the LED.
> > > + enum:
> > > + - 0 # LED output INDICATOR1
> > > + - 1 # LED output INDICATOR2
> > > + - 2 # LED output INDICATOR3
> > > + - 3 # LED output INDICATOR4
> > > + - 4 # LED output FLED1
> > > + - 5 # LED output FLED2
> > > +
> > > +unevaluatedProperties: false
> > > +
> > > +required:
> > > + - compatible
> > > + - "#address-cells"
> > > + - "#size-cells"
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > + - |
> > > + #include <dt-bindings/leds/common.h>
> > > + led-controller {
> > > + compatible = "mediatek,mt6360-led";
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > +
> > > + led@0 {
> > > + reg = <0>;
> > > + function = LED_FUNCTION_INDICATOR;
> > > + color = <LED_COLOR_ID_RED>;
> > > + default-state = "off";
> > > + };
> > > + led@1 {
> > > + reg = <1>;
> > > + function = LED_FUNCTION_INDICATOR;
> > > + color = <LED_COLOR_ID_GREEN>;
> > > + default-state = "off";
> > > + };
> > > + led@2 {
> > > + reg = <2>;
> > > + function = LED_FUNCTION_INDICATOR;
> > > + color = <LED_COLOR_ID_BLUE>;
> > > + default-state = "off";
> > > + };
> > > + led@3 {
> > > + reg = <3>;
> > > + function = LED_FUNCTION_INDICATOR;
> > > + color = <LED_COLOR_ID_AMBER>;
> > > + default-state = "off";
> > > + };
> > > + led@4 {
> > > + reg = <4>;
> > > + function = LED_FUNCTION_FLASH;
> > > + color = <LED_COLOR_ID_WHITE>;
> > > + function-enumerator = <1>;
> > > + default-state = "off";
> > > + led-max-microamp = <200000>;
> > > + flash-max-microamp = <500000>;
> > > + flash-max-timeout-us = <1024000>;
> > > + };
> > > + led@5 {
> > > + reg = <5>;
> > > + function = LED_FUNCTION_FLASH;
> > > + color = <LED_COLOR_ID_WHITE>;
> > > + function-enumerator = <2>;
> > > + default-state = "off";
> > > + led-max-microamp = <200000>;
> > > + flash-max-microamp = <500000>;
> > > + flash-max-timeout-us = <1024000>;
> > > + };
> > > + };
> > > +...
> > > --
> > > 2.7.4
> > >