Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753014AbbKBF0Q (ORCPT ); Mon, 2 Nov 2015 00:26:16 -0500 Received: from bear.ext.ti.com ([192.94.94.41]:49930 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751903AbbKBFZQ (ORCPT ); Mon, 2 Nov 2015 00:25:16 -0500 From: Milo Kim To: , , CC: Milo Kim , Jacek Anaszewski , Subject: [PATCH RESEND 15/16] leds: add LM3633 driver Date: Mon, 2 Nov 2015 14:24:34 +0900 Message-ID: <1446441875-1256-16-git-send-email-milo.kim@ti.com> X-Mailer: git-send-email 1.9.5.msysgit.0 In-Reply-To: <1446441875-1256-1-git-send-email-milo.kim@ti.com> References: <1446441875-1256-1-git-send-email-milo.kim@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 24604 Lines: 905 LM3633 LED driver supports generic LED functions and pattern generation. Pattern is generated through the sysfs. ABI documentation is also added. Device creation from device tree -------------------------------- LED channel name, LED string usage and max current settings are configured inside the DT. LED dimming pattern generation ------------------------------ LM3633 supports programmable dimming pattern generator. To enable it, three attributes are used. 'pattern_times', 'pattern_levels' and 'run_pattern'. Sysfs ABI describes it. LMU HWMON event handling ------------------------ As soon as LMU HWMON operation is done, LMU HWMON driver sends the event, 'LMU_EVENT_HWMON_DONE'. Then, LM3633 device should be reinitialized because the device was reset by LMU HWMON driver. lm3633_led_hwmon_notifier() handles this event. Data structure -------------- ti_lmu_led_chip: LED device data. ti_lmu_led: LED output channel data. One LED device can have multiple LED channels. Cc: Jacek Anaszewski Cc: linux-leds@vger.kernel.org Cc: Lee Jones Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Milo Kim --- Documentation/ABI/testing/sysfs-class-led-lm3633 | 60 ++ drivers/leds/Kconfig | 10 + drivers/leds/Makefile | 1 + drivers/leds/leds-lm3633.c | 749 +++++++++++++++++++++++ 4 files changed, 820 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-class-led-lm3633 create mode 100644 drivers/leds/leds-lm3633.c diff --git a/Documentation/ABI/testing/sysfs-class-led-lm3633 b/Documentation/ABI/testing/sysfs-class-led-lm3633 new file mode 100644 index 0000000..c1d8759 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-led-lm3633 @@ -0,0 +1,60 @@ +LM3633 LED driver generates programmable pattern via the sysfs. + +LED Pattern Generator Structure + + (3) + (a) ---------------> ___________ + / \ + (2) / \ (4) + (b) ----> _________/ \_________ ... + (1) (5) + + |<----- period -----> | + +What: /sys/class/leds//pattern_times +Date: Oct 2015 +KernelVersion: 4.3 +Contact: Milo Kim +Description: read/write + Set pattern time dimension. There are five arguments. + (1) startup delay + (2) rising dimming time + (3) how much time stays at high level + (4) falling dimming time + (5) how much time stays at low level + Ranges are + (1), (3), (5): 0 ~ 10000. Unit is millisecond. + (2), (4): 0 ~ 16000. Unit is millisecond. + + Example: + No delay, rising 200ms, high 300ms, falling 100ms, low 400ms. + echo "0 200 300 100 400" > /sys/class/leds//pattern_times + + cat /sys/class/leds//pattern_times + delay: 0, rise: 200, high: 300, fall: 100, low: 400 + +What: /sys/class/leds//pattern_levels +Date: Oct 2015 +KernelVersion: 4.3 +Contact: Milo Kim +Description: read/write + Set pattern level(brightness). There are two arguments. + (a) Low brightness level + (b) High brightness level + Ranges are from 0 to 255. + + Example: + Low level is 0, high level is 255. + echo "0 255" > /sys/class/leds//pattern_levels + + cat /sys/class/leds//pattern_levels + low brightness: 0, high brightness: 255 + +What: /sys/class/leds//run_pattern +Date: Oct 2015 +KernelVersion: 4.3 +Contact: Milo Kim +Description: write only + After 'pattern_times' and 'pattern_levels' are updated, + run the pattern by writing 1 to 'run_pattern'. + To stop running pattern, writes 0 to 'run_pattern'. diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 42990f2..bc41a0e 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -88,6 +88,16 @@ config LEDS_LM3533 hardware-accelerated blinking with maximum on and off periods of 9.8 and 77 seconds respectively. +config LEDS_LM3633 + tristate "LED support for the TI LM3633 LMU" + depends on LEDS_CLASS + depends on MFD_TI_LMU + help + This option enables support for the LEDs on the LM3633. + LM3633 has 6 low voltage indicator LEDs. + All low voltage current sinks can have a programmable pattern + modulated onto LED output strings. + config LEDS_LM3642 tristate "LED support for LM3642 Chip" depends on LEDS_CLASS && I2C diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index b503f92..984f44a 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o +obj-$(CONFIG_LEDS_LM3633) += leds-lm3633.o obj-$(CONFIG_LEDS_LM3642) += leds-lm3642.o obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o diff --git a/drivers/leds/leds-lm3633.c b/drivers/leds/leds-lm3633.c new file mode 100644 index 0000000..66da609 --- /dev/null +++ b/drivers/leds/leds-lm3633.c @@ -0,0 +1,749 @@ +/* + * TI LM3633 LED driver + * + * Copyright 2015 Texas Instruments + * + * Author: Milo Kim + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LM3633_LED_MAX_BRIGHTNESS 255 +#define LM3633_DEFAULT_LED_NAME "indicator" +#define LM3633_MAX_PERIOD 9700 +#define LM3633_SHORT_TIMESTEP 16 +#define LM3633_LONG_TIMESTEP 131 +#define LM3633_TIME_OFFSET 61 +#define LM3633_PATTERN_REG_OFFSET 16 + +enum lm3633_led_bank_id { + LM3633_LED_BANK_C, + LM3633_LED_BANK_D, + LM3633_LED_BANK_E, + LM3633_LED_BANK_F, + LM3633_LED_BANK_G, + LM3633_LED_BANK_H, + LM3633_MAX_LEDS, +}; + +struct lm3633_pattern_time { + unsigned int delay; + unsigned int rise; + unsigned int high; + unsigned int fall; + unsigned int low; +}; + +struct lm3633_pattern_level { + u8 low; + u8 high; +}; + +/** + * struct ti_lmu_led_chip + * + * @dev: Parent device pointer + * @lmu: LMU structure. Used for register R/W access. + * @lock: Secure handling for multiple user interface access + * @lmu_led: Multiple LED strings + * @num_leds: Number of LED strings + * @nb: Notifier block for handling hwmon event + * + * One LED chip can have multiple LED strings. + */ +struct ti_lmu_led_chip { + struct device *dev; + struct ti_lmu *lmu; + struct mutex lock; + struct ti_lmu_led *lmu_led; + int num_leds; + struct notifier_block nb; +}; + +/** + * struct ti_lmu_led + * + * @chip: Pointer to parent LED device + * @bank_id: LED bank ID + * @cdev: LED subsystem device structure + * @name: LED channel name + * @led_string: LED string configuration. + * Bit mask is set on parsing DT. + * @imax: [Optional] Max current index. + * It's result of ti_lmu_get_current_code(). + * @work: Used for scheduling brightness control + * @brightness: Brightness value + * @time: Pattern time dimension + * @level: Pattern level dimension + * + * Each LED device has its own channel configuration. + * For chip control, parent chip data structure is used. + */ +struct ti_lmu_led { + struct ti_lmu_led_chip *chip; + enum lm3633_led_bank_id bank_id; + struct led_classdev cdev; + const char *name; + + unsigned long led_string; /* bit OR mask of LMU_LVLEDx */; + #define LMU_LVLED1 BIT(0) + #define LMU_LVLED2 BIT(1) + #define LMU_LVLED3 BIT(2) + #define LMU_LVLED4 BIT(3) + #define LMU_LVLED5 BIT(4) + #define LMU_LVLED6 BIT(5) + + struct work_struct work; + enum led_brightness brightness; + enum ti_lmu_max_current imax; + + /* Pattern specific data */ + struct lm3633_pattern_time time; + struct lm3633_pattern_level level; +}; + +static struct ti_lmu_led *to_ti_lmu_led(struct device *dev) +{ + struct led_classdev *cdev = dev_get_drvdata(dev); + + return container_of(cdev, struct ti_lmu_led, cdev); +} + +static u8 lm3633_led_get_enable_mask(struct ti_lmu_led *lmu_led) +{ + return 1 << (lmu_led->bank_id + LM3633_LED_BANK_OFFSET); +} + +static int lm3633_led_enable_bank(struct ti_lmu_led *lmu_led) +{ + u8 mask = lm3633_led_get_enable_mask(lmu_led); + + return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_ENABLE, + mask, mask); +} + +static int lm3633_led_disable_bank(struct ti_lmu_led *lmu_led) +{ + u8 mask = lm3633_led_get_enable_mask(lmu_led); + + return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_ENABLE, + mask, 0); +} + +static int lm3633_led_enable_pattern(struct ti_lmu_led *lmu_led) +{ + u8 mask = lm3633_led_get_enable_mask(lmu_led); + + return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_PATTERN, mask, + mask); +} + +static int lm3633_led_disable_pattern(struct ti_lmu_led *lmu_led) +{ + u8 mask = lm3633_led_get_enable_mask(lmu_led); + + return ti_lmu_update_bits(lmu_led->chip->lmu, LM3633_REG_PATTERN, mask, + 0); +} + +static int lm3633_led_config_bank(struct ti_lmu_led *lmu_led) +{ + const u8 group_led[] = { 0, BIT(0), BIT(0), 0, BIT(3), BIT(3), }; + const enum lm3633_led_bank_id default_id[] = { + LM3633_LED_BANK_C, LM3633_LED_BANK_C, LM3633_LED_BANK_C, + LM3633_LED_BANK_F, LM3633_LED_BANK_F, LM3633_LED_BANK_F, + }; + const enum lm3633_led_bank_id separate_id[] = { + LM3633_LED_BANK_C, LM3633_LED_BANK_D, LM3633_LED_BANK_E, + LM3633_LED_BANK_F, LM3633_LED_BANK_G, LM3633_LED_BANK_H, + }; + int i, ret; + u8 val; + + /* + * Check configured LED string and assign control bank + * + * Each LED is tied with other LEDS (group): + * the default control bank is assigned + * + * Otherwise: + * separate bank is assigned + */ + + for (i = 0; i < LM3633_MAX_LEDS; i++) { + /* LED 0 and LED 3 are fixed, so no assignment is required */ + if (i == 0 || i == 3) + continue; + + if (test_bit(i, &lmu_led->led_string)) { + if (lmu_led->led_string & group_led[i]) { + lmu_led->bank_id = default_id[i]; + val = 0; + } else { + lmu_led->bank_id = separate_id[i]; + val = BIT(i); + } + + ret = ti_lmu_update_bits(lmu_led->chip->lmu, + LM3633_REG_BANK_SEL, + BIT(i), val); + if (ret) + return ret; + } + } + + return 0; +} + +static ssize_t lm3633_led_show_pattern_times(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev); + + return sprintf(buf, + "delay: %u, rise: %u, high: %u, fall: %u, low: %u\n", + lmu_led->time.delay, lmu_led->time.rise, + lmu_led->time.high, lmu_led->time.fall, + lmu_led->time.low); +} + +static u8 lm3633_convert_time_to_index(unsigned int msec) +{ + u8 idx, offset; + + /* + * Find appropriate register index around input time value + * + * 0 <= time <= 1000 : 16ms step + * 1000 < time <= 9700 : 131ms step, base index is 61 + */ + + msec = min_t(int, msec, LM3633_MAX_PERIOD); + + if (msec <= 1000) { + idx = msec / LM3633_SHORT_TIMESTEP; + if (idx > 1) + idx--; + offset = 0; + } else { + idx = (msec - 1000) / LM3633_LONG_TIMESTEP; + offset = LM3633_TIME_OFFSET; + } + + return idx + offset; +} + +static u8 lm3633_convert_ramp_to_index(unsigned int msec) +{ + const int ramp_table[] = { 2, 250, 500, 1000, 2000, 4000, 8000, 16000 }; + int size = ARRAY_SIZE(ramp_table); + int i; + + if (msec <= ramp_table[0]) + return 0; + + if (msec > ramp_table[size - 1]) + return size - 1; + + for (i = 1; i < size; i++) { + if (msec == ramp_table[i]) + return i; + + /* Find the most closest value by looking up the table */ + if (msec > ramp_table[i - 1] && msec < ramp_table[i]) { + if (msec - ramp_table[i - 1] < ramp_table[i] - msec) + return i - 1; + else + return i; + } + } + + return 0; +} + +static ssize_t lm3633_led_store_pattern_times(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev); + struct ti_lmu_led_chip *chip = lmu_led->chip; + struct lm3633_pattern_time *time = &lmu_led->time; + u8 offset = lmu_led->bank_id * LM3633_PATTERN_REG_OFFSET; + int ret; + u8 reg, val; + + /* + * Sequence + * + * 1) Read pattern time data (unit: msec) + * 2) Update DELAY register + * 3) Update HIGH TIME register + * 4) Update LOW TIME register + * 5) Update RAMP TIME registers + * + * Time register addresses need offset number based on the LED bank. + * Register values are index domain, so input time value should be + * converted to index. + * Please note that ramp register address has no offset value. + */ + + ret = sscanf(buf, "%u %u %u %u %u", &time->delay, &time->rise, + &time->high, &time->fall, &time->low); + if (ret != 5) + return -EINVAL; + + mutex_lock(&chip->lock); + + reg = LM3633_REG_PTN_DELAY + offset; + val = lm3633_convert_time_to_index(time->delay); + ret = ti_lmu_write_byte(chip->lmu, reg, val); + if (ret) + goto skip; + + reg = LM3633_REG_PTN_HIGHTIME + offset; + val = lm3633_convert_time_to_index(time->high); + ret = ti_lmu_write_byte(chip->lmu, reg, val); + if (ret) + goto skip; + + reg = LM3633_REG_PTN_LOWTIME + offset; + val = lm3633_convert_time_to_index(time->low); + ret = ti_lmu_write_byte(chip->lmu, reg, val); + if (ret) + goto skip; + + switch (lmu_led->bank_id) { + case LM3633_LED_BANK_C: + case LM3633_LED_BANK_D: + case LM3633_LED_BANK_E: + reg = LM3633_REG_PTN0_RAMP; + break; + case LM3633_LED_BANK_F: + case LM3633_LED_BANK_G: + case LM3633_LED_BANK_H: + reg = LM3633_REG_PTN1_RAMP; + break; + default: + ret = -EINVAL; + goto skip; + } + + val = lm3633_convert_ramp_to_index(time->rise); + ret = ti_lmu_update_bits(chip->lmu, reg, LM3633_PTN_RAMPUP_MASK, + val << LM3633_PTN_RAMPUP_SHIFT); + if (ret) + goto skip; + + val = lm3633_convert_ramp_to_index(time->fall); + ret = ti_lmu_update_bits(chip->lmu, reg, LM3633_PTN_RAMPDN_MASK, + val << LM3633_PTN_RAMPDN_SHIFT); + if (ret) + goto skip; + + mutex_unlock(&chip->lock); + return len; + +skip: + mutex_unlock(&chip->lock); + return ret; +} + +static ssize_t lm3633_led_show_pattern_levels(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev); + + return sprintf(buf, "low brightness: %u, high brightness: %u\n", + lmu_led->level.low, lmu_led->level.high); +} + +static ssize_t lm3633_led_store_pattern_levels(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev); + struct ti_lmu_led_chip *chip = lmu_led->chip; + unsigned int low, high; + u8 reg, offset, val; + int ret; + + /* + * Sequence + * + * 1) Read pattern level data + * 2) Disable a bank before programming a pattern + * 3) Update LOW BRIGHTNESS register + * 4) Update HIGH BRIGHTNESS register + * + * Level register addresses have offset number based on the LED bank. + */ + + ret = sscanf(buf, "%u %u", &low, &high); + if (ret != 2) + return -EINVAL; + + low = min_t(unsigned int, low, LM3633_LED_MAX_BRIGHTNESS); + high = min_t(unsigned int, high, LM3633_LED_MAX_BRIGHTNESS); + lmu_led->level.low = (u8)low; + lmu_led->level.high = (u8)high; + + mutex_lock(&chip->lock); + ret = lm3633_led_disable_bank(lmu_led); + if (ret) + goto skip; + + offset = lmu_led->bank_id * LM3633_PATTERN_REG_OFFSET; + reg = LM3633_REG_PTN_LOWBRT + offset; + val = lmu_led->level.low; + ret = ti_lmu_write_byte(chip->lmu, reg, val); + if (ret) + goto skip; + + offset = lmu_led->bank_id; + reg = LM3633_REG_PTN_HIGHBRT + offset; + val = lmu_led->level.high; + ret = ti_lmu_write_byte(chip->lmu, reg, val); + if (ret) + goto skip; + + mutex_unlock(&chip->lock); + return len; + +skip: + mutex_unlock(&chip->lock); + return ret; +} + +static ssize_t lm3633_led_run_pattern(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct ti_lmu_led *lmu_led = to_ti_lmu_led(dev); + struct ti_lmu_led_chip *chip = lmu_led->chip; + unsigned long enable; + int ret; + + if (kstrtoul(buf, 0, &enable)) + return -EINVAL; + + mutex_lock(&chip->lock); + + if (enable) + ret = lm3633_led_enable_pattern(lmu_led); + else + ret = lm3633_led_disable_pattern(lmu_led); + + if (ret) { + mutex_unlock(&chip->lock); + return ret; + } + + if (enable) + lm3633_led_enable_bank(lmu_led); + + mutex_unlock(&chip->lock); + + return len; +} + +static DEVICE_ATTR(pattern_times, S_IRUGO | S_IWUSR, + lm3633_led_show_pattern_times, + lm3633_led_store_pattern_times); +static DEVICE_ATTR(pattern_levels, S_IRUGO | S_IWUSR, + lm3633_led_show_pattern_levels, + lm3633_led_store_pattern_levels); +static DEVICE_ATTR(run_pattern, S_IWUSR, NULL, + lm3633_led_run_pattern); + +static struct attribute *lm3633_led_attrs[] = { + &dev_attr_pattern_times.attr, + &dev_attr_pattern_levels.attr, + &dev_attr_run_pattern.attr, + NULL, +}; +ATTRIBUTE_GROUPS(lm3633_led); /* lm3633_led_groups */ + +static int lm3633_led_set_max_current(struct ti_lmu_led *lmu_led) +{ + u8 reg = LM3633_REG_IMAX_LVLED_BASE + lmu_led->bank_id; + + return ti_lmu_write_byte(lmu_led->chip->lmu, reg, lmu_led->imax); +} + +static void lm3633_led_work(struct work_struct *work) +{ + struct ti_lmu_led *lmu_led = container_of(work, struct ti_lmu_led, + work); + struct ti_lmu_led_chip *chip = lmu_led->chip; + int ret; + + mutex_lock(&chip->lock); + + ret = ti_lmu_write_byte(chip->lmu, + LM3633_REG_BRT_LVLED_BASE + lmu_led->bank_id, + lmu_led->brightness); + if (ret) { + mutex_unlock(&chip->lock); + return; + } + + if (lmu_led->brightness == 0) + lm3633_led_disable_bank(lmu_led); + else + lm3633_led_enable_bank(lmu_led); + + mutex_unlock(&chip->lock); +} + +static void lm3633_led_brightness_set(struct led_classdev *cdev, + enum led_brightness brt_val) +{ + struct ti_lmu_led *lmu_led = container_of(cdev, struct ti_lmu_led, + cdev); + + lmu_led->brightness = brt_val; + schedule_work(&lmu_led->work); +} + +static int lm3633_led_init(struct ti_lmu_led *lmu_led, int bank_id) +{ + struct device *dev = lmu_led->chip->dev; + char name[12]; + int ret; + + /* + * Sequence + * + * 1) Configure LED bank which is used for brightness control + * 2) Set max current for each output channel + * 3) Add LED device + */ + + ret = lm3633_led_config_bank(lmu_led); + if (ret) { + dev_err(dev, "Output bank register err: %d\n", ret); + return ret; + } + + ret = lm3633_led_set_max_current(lmu_led); + if (ret) { + dev_err(dev, "Set max current err: %d\n", ret); + return ret; + } + + lmu_led->cdev.max_brightness = LM3633_LED_MAX_BRIGHTNESS; + lmu_led->cdev.brightness_set = lm3633_led_brightness_set; + lmu_led->cdev.groups = lm3633_led_groups; + + if (lmu_led->name) { + lmu_led->cdev.name = lmu_led->name; + } else { + snprintf(name, sizeof(name), "%s:%d", LM3633_DEFAULT_LED_NAME, + bank_id); + lmu_led->cdev.name = name; + } + + ret = led_classdev_register(dev, &lmu_led->cdev); + if (ret) { + dev_err(dev, "LED register err: %d\n", ret); + return ret; + } + + INIT_WORK(&lmu_led->work, lm3633_led_work); + + return 0; +} + +static int lm3633_led_of_create(struct ti_lmu_led_chip *chip, + struct device_node *np) +{ + struct device_node *child; + struct device *dev = chip->dev; + struct ti_lmu_led *lmu_led, *each; + int num_leds; + int i = 0; + u32 imax; + + if (!np) + return -ENODEV; + + num_leds = of_get_child_count(np); + if (num_leds == 0 || num_leds > LM3633_MAX_LEDS) { + dev_err(dev, "Invalid number of LEDs: %d\n", num_leds); + return -EINVAL; + } + + lmu_led = devm_kzalloc(dev, sizeof(*lmu_led) * num_leds, GFP_KERNEL); + if (!lmu_led) + return -ENOMEM; + + for_each_child_of_node(np, child) { + each = lmu_led + i; + + of_property_read_string(child, "channel-name", &each->name); + + /* Make LED strings */ + each->led_string = 0; + if (of_property_read_bool(child, "lvled1-used")) + each->led_string |= LMU_LVLED1; + if (of_property_read_bool(child, "lvled2-used")) + each->led_string |= LMU_LVLED2; + if (of_property_read_bool(child, "lvled3-used")) + each->led_string |= LMU_LVLED3; + if (of_property_read_bool(child, "lvled4-used")) + each->led_string |= LMU_LVLED4; + if (of_property_read_bool(child, "lvled5-used")) + each->led_string |= LMU_LVLED5; + if (of_property_read_bool(child, "lvled6-used")) + each->led_string |= LMU_LVLED6; + + imax = 0; + of_property_read_u32(child, "led-max-microamp", &imax); + each->imax = ti_lmu_get_current_code(imax); + + each->bank_id = 0; + each->chip = chip; + i++; + } + + chip->lmu_led = lmu_led; + chip->num_leds = num_leds; + + return 0; +} + +static int lm3633_led_hwmon_notifier(struct notifier_block *nb, + unsigned long action, void *unused) +{ + struct ti_lmu_led_chip *chip = container_of(nb, struct ti_lmu_led_chip, + nb); + struct ti_lmu_led *each; + int i, ret; + + /* LED should be reconfigured after hwmon procedure is done */ + if (action == LMU_EVENT_HWMON_DONE) { + for (i = 0; i < chip->num_leds; i++) { + each = chip->lmu_led + i; + ret = lm3633_led_config_bank(each); + if (ret) { + dev_err(chip->dev, + "Output bank register err: %d\n", ret); + return NOTIFY_STOP; + } + + ret = lm3633_led_set_max_current(each); + if (ret) { + dev_err(chip->dev, "Set max current err: %d\n", + ret); + return NOTIFY_STOP; + } + } + } + + return NOTIFY_OK; +} + +static int lm3633_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ti_lmu *lmu = dev_get_drvdata(dev->parent); + struct ti_lmu_led_chip *chip; + struct ti_lmu_led *each; + int i, ret; + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = dev; + chip->lmu = lmu; + + ret = lm3633_led_of_create(chip, dev->of_node); + if (ret) + return ret; + + /* + * Notifier callback is required because LED device needs + * reconfiguration after opened/shorted circuit fault monitoring + * by ti-lmu-hwmon driver. + */ + chip->nb.notifier_call = lm3633_led_hwmon_notifier; + ret = blocking_notifier_chain_register(&chip->lmu->notifier, &chip->nb); + if (ret) + return ret; + + for (i = 0; i < chip->num_leds; i++) { + each = chip->lmu_led + i; + ret = lm3633_led_init(each, i); + if (ret) { + dev_err(dev, "LED initialization err: %d\n", ret); + goto cleanup_leds; + } + } + + mutex_init(&chip->lock); + platform_set_drvdata(pdev, chip); + + return 0; + +cleanup_leds: + while (--i >= 0) { + each = chip->lmu_led + i; + led_classdev_unregister(&each->cdev); + } + return ret; +} + +static int lm3633_led_remove(struct platform_device *pdev) +{ + struct ti_lmu_led_chip *chip = platform_get_drvdata(pdev); + struct ti_lmu_led *each; + int i; + + blocking_notifier_chain_unregister(&chip->lmu->notifier, &chip->nb); + + for (i = 0; i < chip->num_leds; i++) { + each = chip->lmu_led + i; + led_classdev_unregister(&each->cdev); + flush_work(&each->work); + } + + return 0; +} + +static const struct of_device_id lm3633_led_of_match[] = { + { .compatible = "ti,lm3633-leds" }, + { } +}; +MODULE_DEVICE_TABLE(of, lm3633_led_of_match); + +static struct platform_driver lm3633_led_driver = { + .probe = lm3633_led_probe, + .remove = lm3633_led_remove, + .driver = { + .name = "lm3633-leds", + .of_match_table = lm3633_led_of_match, + }, +}; + +module_platform_driver(lm3633_led_driver); + +MODULE_DESCRIPTION("TI LM3633 LED Driver"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:lm3633-leds"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/