This patch adds one new led trigger that LED device can configure
the software or hardware pattern and trigger it.
Consumers can write 'pattern' file to enable the software pattern
which alters the brightness for the specified duration with one
software timer.
Moreover consumers can write 'hw_pattern' file to enable the hardware
pattern for some LED controllers which can autonomously control
brightness over time, according to some preprogrammed hardware
patterns.
Signed-off-by: Raphael Teysseyre <[email protected]>
Signed-off-by: Baolin Wang <[email protected]>
---
Changes from v10:
- Change 'int' to 'u32' for delta_t field.
Changes from v9:
- None.
Changes from v8:
- None.
Changes from v7:
- Move the SC27XX hardware patterns description into its own ABI file.
Changes from v6:
- Improve commit message.
- Optimize the description of the hw_pattern file.
- Simplify some logics.
Changes from v5:
- Add one 'hw_pattern' file for hardware patterns.
Changes from v4:
- Change the repeat file to return the originally written number.
- Improve comments.
- Fix some build warnings.
Changes from v3:
- Reset pattern number to 0 if user provides incorrect pattern string.
- Support one pattern.
Changes from v2:
- Remove hardware_pattern boolen.
- Chnage the pattern string format.
Changes from v1:
- Use ATTRIBUTE_GROUPS() to define attributes.
- Introduce hardware_pattern flag to determine if software pattern
or hardware pattern.
- Re-implement pattern_trig_store_pattern() function.
- Remove pattern_get() interface.
- Improve comments.
- Other small optimization.
---
.../ABI/testing/sysfs-class-led-trigger-pattern | 38 +++
drivers/leds/trigger/Kconfig | 7 +
drivers/leds/trigger/Makefile | 1 +
drivers/leds/trigger/ledtrig-pattern.c | 337 ++++++++++++++++++++
include/linux/leds.h | 16 +
5 files changed, 399 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-led-trigger-pattern
create mode 100644 drivers/leds/trigger/ledtrig-pattern.c
diff --git a/Documentation/ABI/testing/sysfs-class-led-trigger-pattern b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern
new file mode 100644
index 0000000..8cc5099
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-trigger-pattern
@@ -0,0 +1,38 @@
+What: /sys/class/leds/<led>/pattern
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a software pattern for the LED, that supports altering
+ the brightness for the specified duration with one software
+ timer.
+
+ The pattern is given by a series of tuples, of brightness and
+ duration (ms). The LED is expected to traverse the series and
+ each brightness value for the specified duration. Duration of
+ 0 means brightness should immediately change to new value.
+
+ The format of the software pattern values should be:
+ "brightness_1 duration_1 brightness_2 duration_2 brightness_3
+ duration_3 ...".
+
+What: /sys/class/leds/<led>/hw_pattern
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a hardware pattern for the LED, for LED hardware that
+ supports autonomously controlling brightness over time, according
+ to some preprogrammed hardware patterns.
+
+ Since different LED hardware can have different semantics of
+ hardware patterns, each driver is expected to provide its own
+ description for the hardware patterns in their ABI documentation
+ file.
+
+What: /sys/class/leds/<led>/repeat
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a pattern repeat number. 0 means repeat indefinitely.
+
+ This file will always return the originally written repeat
+ number.
diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
index 4018af7..b76fc3c 100644
--- a/drivers/leds/trigger/Kconfig
+++ b/drivers/leds/trigger/Kconfig
@@ -129,4 +129,11 @@ config LEDS_TRIGGER_NETDEV
This allows LEDs to be controlled by network device activity.
If unsure, say Y.
+config LEDS_TRIGGER_PATTERN
+ tristate "LED Pattern Trigger"
+ help
+ This allows LEDs to be controlled by a software or hardware pattern
+ which is a series of tuples, of brightness and duration (ms).
+ If unsure, say N
+
endif # LEDS_TRIGGERS
diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile
index f3cfe19..9bcb64e 100644
--- a/drivers/leds/trigger/Makefile
+++ b/drivers/leds/trigger/Makefile
@@ -13,3 +13,4 @@ obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o
obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
+obj-$(CONFIG_LEDS_TRIGGER_PATTERN) += ledtrig-pattern.o
diff --git a/drivers/leds/trigger/ledtrig-pattern.c b/drivers/leds/trigger/ledtrig-pattern.c
new file mode 100644
index 0000000..e7c9978
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-pattern.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * LED pattern trigger
+ *
+ * Idea discussed with Pavel Machek. Raphael Teysseyre implemented
+ * the first version, Baolin Wang simplified and improved the approach.
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+#define MAX_PATTERNS 1024
+
+struct pattern_trig_data {
+ struct led_classdev *led_cdev;
+ struct led_pattern patterns[MAX_PATTERNS];
+ struct led_pattern *curr;
+ struct led_pattern *next;
+ struct mutex lock;
+ u32 npatterns;
+ u32 repeat;
+ u32 last_repeat;
+ bool is_indefinite;
+ bool is_hw_pattern;
+ struct timer_list timer;
+};
+
+static void pattern_trig_update_patterns(struct pattern_trig_data *data)
+{
+ data->curr = data->next;
+ if (!data->is_indefinite && data->curr == data->patterns)
+ data->repeat--;
+
+ if (data->next == data->patterns + data->npatterns - 1)
+ data->next = data->patterns;
+ else
+ data->next++;
+}
+
+static void pattern_trig_timer_function(struct timer_list *t)
+{
+ struct pattern_trig_data *data = from_timer(data, t, timer);
+
+ mutex_lock(&data->lock);
+
+ if (!data->is_indefinite && !data->repeat) {
+ mutex_unlock(&data->lock);
+ return;
+ }
+
+ led_set_brightness(data->led_cdev, data->curr->brightness);
+ mod_timer(&data->timer, jiffies + msecs_to_jiffies(data->curr->delta_t));
+ pattern_trig_update_patterns(data);
+
+ mutex_unlock(&data->lock);
+}
+
+static int pattern_trig_start_pattern(struct led_classdev *led_cdev)
+{
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+
+ if (!data->npatterns)
+ return 0;
+
+ if (data->is_hw_pattern) {
+ return led_cdev->pattern_set(led_cdev, data->patterns,
+ data->npatterns, data->repeat);
+ }
+
+ data->curr = data->patterns;
+ data->next = data->npatterns > 1 ? data->patterns + 1 : data->patterns;
+ data->timer.expires = jiffies;
+ add_timer(&data->timer);
+
+ return 0;
+}
+
+static ssize_t repeat_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+ u32 repeat;
+
+ mutex_lock(&data->lock);
+
+ repeat = data->last_repeat;
+
+ mutex_unlock(&data->lock);
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n", repeat);
+}
+
+static ssize_t repeat_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+ unsigned long res;
+ int err;
+
+ err = kstrtoul(buf, 10, &res);
+ if (err)
+ return err;
+
+ /*
+ * Clear previous patterns' performence firstly, and remove the timer
+ * without mutex lock to avoid dead lock.
+ */
+ del_timer_sync(&data->timer);
+
+ mutex_lock(&data->lock);
+
+ if (data->is_hw_pattern)
+ led_cdev->pattern_clear(led_cdev);
+
+ data->last_repeat = data->repeat = res;
+ /* 0 means repeat indefinitely */
+ data->is_indefinite = !data->repeat;
+
+ err = pattern_trig_start_pattern(led_cdev);
+
+ mutex_unlock(&data->lock);
+ return err < 0 ? err : count;
+}
+
+static DEVICE_ATTR_RW(repeat);
+
+static ssize_t pattern_trig_show_patterns(struct pattern_trig_data *data,
+ char *buf, bool hw_pattern)
+{
+ ssize_t count = 0;
+ int i;
+
+ mutex_lock(&data->lock);
+
+ if (!data->npatterns || (data->is_hw_pattern ^ hw_pattern))
+ goto out;
+
+ for (i = 0; i < data->npatterns; i++) {
+ count += scnprintf(buf + count, PAGE_SIZE - count,
+ "%d %u ",
+ data->patterns[i].brightness,
+ data->patterns[i].delta_t);
+ }
+
+ buf[count - 1] = '\n';
+
+out:
+ mutex_unlock(&data->lock);
+ return count;
+}
+
+static ssize_t pattern_trig_store_patterns(struct led_classdev *led_cdev,
+ const char *buf, size_t count,
+ bool hw_pattern)
+{
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+ int ccount, cr, offset = 0, err = 0;
+
+ /*
+ * Clear previous patterns' performence firstly, and remove the timer
+ * without mutex lock to avoid dead lock.
+ */
+ del_timer_sync(&data->timer);
+
+ mutex_lock(&data->lock);
+
+ if (data->is_hw_pattern)
+ led_cdev->pattern_clear(led_cdev);
+
+ data->is_hw_pattern = hw_pattern;
+ data->npatterns = 0;
+
+ while (offset < count - 1 && data->npatterns < MAX_PATTERNS) {
+ cr = 0;
+ ccount = sscanf(buf + offset, "%d %u %n",
+ &data->patterns[data->npatterns].brightness,
+ &data->patterns[data->npatterns].delta_t, &cr);
+ if (ccount != 2) {
+ data->npatterns = 0;
+ err = -EINVAL;
+ goto out;
+ }
+
+ offset += cr;
+ data->npatterns++;
+ }
+
+ err = pattern_trig_start_pattern(led_cdev);
+
+out:
+ mutex_unlock(&data->lock);
+ return err < 0 ? err : count;
+}
+
+static ssize_t pattern_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+
+ return pattern_trig_show_patterns(data, buf, false);
+}
+
+static ssize_t pattern_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+ return pattern_trig_store_patterns(led_cdev, buf, count, false);
+}
+
+static DEVICE_ATTR_RW(pattern);
+
+static ssize_t hw_pattern_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+
+ return pattern_trig_show_patterns(data, buf, true);
+}
+
+static ssize_t hw_pattern_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+ return pattern_trig_store_patterns(led_cdev, buf, count, true);
+}
+
+static DEVICE_ATTR_RW(hw_pattern);
+
+static umode_t pattern_trig_attrs_mode(struct kobject *kobj,
+ struct attribute *attr, int index)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+ if (attr == &dev_attr_repeat.attr || attr == &dev_attr_pattern.attr)
+ return attr->mode;
+ else if (attr == &dev_attr_hw_pattern.attr && led_cdev->pattern_set)
+ return attr->mode;
+
+ return 0;
+}
+
+static struct attribute *pattern_trig_attrs[] = {
+ &dev_attr_pattern.attr,
+ &dev_attr_hw_pattern.attr,
+ &dev_attr_repeat.attr,
+ NULL
+};
+
+static const struct attribute_group pattern_trig_group = {
+ .attrs = pattern_trig_attrs,
+ .is_visible = pattern_trig_attrs_mode,
+};
+
+static const struct attribute_group *pattern_trig_groups[] = {
+ &pattern_trig_group,
+ NULL,
+};
+
+static int pattern_trig_activate(struct led_classdev *led_cdev)
+{
+ struct pattern_trig_data *data;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ if (!!led_cdev->pattern_set ^ !!led_cdev->pattern_clear) {
+ dev_warn(led_cdev->dev,
+ "Hardware pattern ops validation failed\n");
+ led_cdev->pattern_set = NULL;
+ led_cdev->pattern_clear = NULL;
+ }
+
+ data->is_indefinite = true;
+ mutex_init(&data->lock);
+ data->led_cdev = led_cdev;
+ led_set_trigger_data(led_cdev, data);
+ timer_setup(&data->timer, pattern_trig_timer_function, 0);
+ led_cdev->activated = true;
+
+ return 0;
+}
+
+static void pattern_trig_deactivate(struct led_classdev *led_cdev)
+{
+ struct pattern_trig_data *data = led_cdev->trigger_data;
+
+ if (!led_cdev->activated)
+ return;
+
+ if (led_cdev->pattern_clear)
+ led_cdev->pattern_clear(led_cdev);
+
+ del_timer_sync(&data->timer);
+
+ led_set_brightness(led_cdev, LED_OFF);
+ kfree(data);
+ led_cdev->activated = false;
+}
+
+static struct led_trigger pattern_led_trigger = {
+ .name = "pattern",
+ .activate = pattern_trig_activate,
+ .deactivate = pattern_trig_deactivate,
+ .groups = pattern_trig_groups,
+};
+
+static int __init pattern_trig_init(void)
+{
+ return led_trigger_register(&pattern_led_trigger);
+}
+
+static void __exit pattern_trig_exit(void)
+{
+ led_trigger_unregister(&pattern_led_trigger);
+}
+
+module_init(pattern_trig_init);
+module_exit(pattern_trig_exit);
+
+MODULE_AUTHOR("Raphael Teysseyre <[email protected]");
+MODULE_AUTHOR("Baolin Wang <[email protected]");
+MODULE_DESCRIPTION("LED Pattern trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 834683d..1bacc62 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -22,6 +22,7 @@
#include <linux/workqueue.h>
struct device;
+struct led_pattern;
/*
* LED Core
*/
@@ -88,6 +89,11 @@ struct led_classdev {
unsigned long *delay_on,
unsigned long *delay_off);
+ int (*pattern_set)(struct led_classdev *led_cdev,
+ struct led_pattern *pattern, int len,
+ unsigned int repeat);
+ int (*pattern_clear)(struct led_classdev *led_cdev);
+
struct device *dev;
const struct attribute_group **groups;
@@ -472,4 +478,14 @@ static inline void led_classdev_notify_brightness_hw_changed(
struct led_classdev *led_cdev, enum led_brightness brightness) { }
#endif
+/**
+ * struct led_pattern - pattern interval settings
+ * @delta_t: pattern interval delay, in milliseconds
+ * @brightness: pattern interval brightness
+ */
+struct led_pattern {
+ u32 delta_t;
+ int brightness;
+};
+
#endif /* __LINUX_LEDS_H_INCLUDED */
--
1.7.9.5
This patch implements the 'pattern_set'and 'pattern_clear'
interfaces to support SC27XX LED breathing mode.
Signed-off-by: Baolin Wang <[email protected]>
Acked-by: Pavel Machek <[email protected]>
---
Changes from v10:
- Add duration alignment function suggested by Jacek.
- Add acked tag from Pavel.
Changes from v9:
- Optimize the ABI documentation file.
- Update the brightness value in hardware pattern mode.
Changes from v8:
- Optimize the ABI documentation file.
Changes from v7:
- Add its own ABI documentation file.
Changes from v6:
- None.
Changes from v5:
- None.
Changes from v4:
- None.
Changes from v3:
- None.
Changes from v2:
- None.
Changes from v1:
- Remove pattern_get interface.
---
.../ABI/testing/sysfs-class-led-driver-sc27xx | 22 ++++
drivers/leds/leds-sc27xx-bltc.c | 121 ++++++++++++++++++++
2 files changed, 143 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-sc27xx
diff --git a/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx b/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx
new file mode 100644
index 0000000..45b1e60
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-driver-sc27xx
@@ -0,0 +1,22 @@
+What: /sys/class/leds/<led>/hw_pattern
+Date: September 2018
+KernelVersion: 4.20
+Description:
+ Specify a hardware pattern for the SC27XX LED. For the SC27XX
+ LED controller, it only supports 4 stages to make a single
+ hardware pattern, which is used to configure the rise time,
+ high time, fall time and low time for the breathing mode.
+
+ For the breathing mode, the SC27XX LED only expects one brightness
+ for the high stage. To be compatible with the hardware pattern
+ format, we should set brightness as 0 for rise stage, fall
+ stage and low stage.
+
+ Min stage duration: 125 ms
+ Max stage duration: 31875 ms
+
+ Since the stage duration step is 125 ms, the duration should be
+ a multiplier of 125, like 125ms, 250ms, 375ms, 500ms ... 31875ms.
+
+ Thus the format of the hardware pattern values should be:
+ "0 rise_duration brightness high_duration 0 fall_duration 0 low_duration".
diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c
index 9d9b7aa..271e028 100644
--- a/drivers/leds/leds-sc27xx-bltc.c
+++ b/drivers/leds/leds-sc27xx-bltc.c
@@ -32,8 +32,18 @@
#define SC27XX_DUTY_MASK GENMASK(15, 0)
#define SC27XX_MOD_MASK GENMASK(7, 0)
+#define SC27XX_CURVE_SHIFT 8
+#define SC27XX_CURVE_L_MASK GENMASK(7, 0)
+#define SC27XX_CURVE_H_MASK GENMASK(15, 8)
+
#define SC27XX_LEDS_OFFSET 0x10
#define SC27XX_LEDS_MAX 3
+#define SC27XX_LEDS_PATTERN_CNT 4
+/* Stage duration step, in milliseconds */
+#define SC27XX_LEDS_STEP 125
+/* Minimum and maximum duration, in milliseconds */
+#define SC27XX_DELTA_T_MIN SC27XX_LEDS_STEP
+#define SC27XX_DELTA_T_MAX (SC27XX_LEDS_STEP * 255)
struct sc27xx_led {
char name[LED_MAX_NAME_SIZE];
@@ -122,6 +132,113 @@ static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
return err;
}
+static void sc27xx_led_clamp_align_delta_t(u32 *delta_t)
+{
+ u32 v, offset, t = *delta_t;
+
+ v = t + SC27XX_LEDS_STEP / 2;
+ v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX);
+ offset = v - SC27XX_DELTA_T_MIN;
+ offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP);
+
+ *delta_t = SC27XX_DELTA_T_MIN + offset;
+}
+
+static int sc27xx_led_pattern_clear(struct led_classdev *ldev)
+{
+ struct sc27xx_led *leds = to_sc27xx_led(ldev);
+ struct regmap *regmap = leds->priv->regmap;
+ u32 base = sc27xx_led_get_offset(leds);
+ u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
+ u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
+ int err;
+
+ mutex_lock(&leds->priv->lock);
+
+ /* Reset the rise, high, fall and low time to zero. */
+ regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0);
+ regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0);
+
+ err = regmap_update_bits(regmap, ctrl_base,
+ (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
+
+ ldev->brightness = LED_OFF;
+
+ mutex_unlock(&leds->priv->lock);
+
+ return err;
+}
+
+static int sc27xx_led_pattern_set(struct led_classdev *ldev,
+ struct led_pattern *pattern,
+ int len, u32 repeat)
+{
+ struct sc27xx_led *leds = to_sc27xx_led(ldev);
+ u32 base = sc27xx_led_get_offset(leds);
+ u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
+ u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
+ struct regmap *regmap = leds->priv->regmap;
+ int err;
+
+ /*
+ * Must contain 4 tuples to configure the rise time, high time, fall
+ * time and low time to enable the breathing mode.
+ */
+ if (len != SC27XX_LEDS_PATTERN_CNT)
+ return -EINVAL;
+
+ mutex_lock(&leds->priv->lock);
+
+ sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t);
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
+ SC27XX_CURVE_L_MASK,
+ pattern[0].delta_t / SC27XX_LEDS_STEP);
+ if (err)
+ goto out;
+
+ sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t);
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
+ SC27XX_CURVE_L_MASK,
+ pattern[1].delta_t / SC27XX_LEDS_STEP);
+ if (err)
+ goto out;
+
+ sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t);
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
+ SC27XX_CURVE_H_MASK,
+ (pattern[2].delta_t / SC27XX_LEDS_STEP) <<
+ SC27XX_CURVE_SHIFT);
+ if (err)
+ goto out;
+
+ sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t);
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
+ SC27XX_CURVE_H_MASK,
+ (pattern[3].delta_t / SC27XX_LEDS_STEP) <<
+ SC27XX_CURVE_SHIFT);
+ if (err)
+ goto out;
+
+ err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
+ SC27XX_DUTY_MASK,
+ (pattern[1].brightness << SC27XX_DUTY_SHIFT) |
+ SC27XX_MOD_MASK);
+ if (err)
+ goto out;
+
+ /* Enable the LED breathing mode */
+ err = regmap_update_bits(regmap, ctrl_base,
+ SC27XX_LED_RUN << ctrl_shift,
+ SC27XX_LED_RUN << ctrl_shift);
+ if (!err)
+ ldev->brightness = pattern[1].brightness;
+
+out:
+ mutex_unlock(&leds->priv->lock);
+
+ return err;
+}
+
static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
{
int i, err;
@@ -140,6 +257,9 @@ static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
led->priv = priv;
led->ldev.name = led->name;
led->ldev.brightness_set_blocking = sc27xx_led_set;
+ led->ldev.pattern_set = sc27xx_led_pattern_set;
+ led->ldev.pattern_clear = sc27xx_led_pattern_clear;
+ led->ldev.default_trigger = "pattern";
err = devm_led_classdev_register(dev, &led->ldev);
if (err)
@@ -241,4 +361,5 @@ static int sc27xx_led_remove(struct platform_device *pdev)
MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
MODULE_AUTHOR("Xiaotong Lu <[email protected]>");
+MODULE_AUTHOR("Baolin Wang <[email protected]>");
MODULE_LICENSE("GPL v2");
--
1.7.9.5