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    Subject[PATCH v18 2/3] leds: flash: mt6370: Add MediaTek MT6370 flashlight support
    Date
    From: ChiYuan Huang <cy_huang@richtek.com>

    The MediaTek MT6370 is a highly-integrated smart power management IC,
    which includes a single cell Li-Ion/Li-Polymer switching battery
    charger, a USB Type-C & Power Delivery (PD) controller, dual Flash
    LED current sources, a RGB LED driver, a backlight WLED driver,
    a display bias driver and a general LDO for portable devices.

    Add support for the MT6370 Flash LED driver. Flash LED in MT6370
    has 2 channels and support torch/strobe mode.

    Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
    Co-developed-by: Alice Chen <alice_chen@richtek.com>
    Signed-off-by: Alice Chen <alice_chen@richtek.com>
    Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
    Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com>
    ---
    v18:
    - Unwrap each line by 100 chars limit.
    - For joint flash, add more comments above the source code.
    - Remove 'sentinel' comment in of_device_id table declaration.
    ---
    drivers/leds/flash/Kconfig | 13 +
    drivers/leds/flash/Makefile | 1 +
    drivers/leds/flash/leds-mt6370-flash.c | 573 +++++++++++++++++++++++++++++++++
    3 files changed, 587 insertions(+)
    create mode 100644 drivers/leds/flash/leds-mt6370-flash.c

    diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
    index d3eb689..49d8922 100644
    --- a/drivers/leds/flash/Kconfig
    +++ b/drivers/leds/flash/Kconfig
    @@ -61,6 +61,19 @@ config LEDS_MT6360
    Independent current sources supply for each flash LED support torch
    and strobe mode.

    +config LEDS_MT6370_FLASH
    + tristate "Flash LED Support for MediaTek MT6370 PMIC"
    + depends on LEDS_CLASS
    + depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
    + depends on MFD_MT6370
    + help
    + Support 2 channels and torch/strobe mode.
    + Say Y here to enable support for
    + MT6370_FLASH_LED device.
    +
    + This driver can also be built as a module. If so, the module
    + will be called "leds-mt6370-flash".
    +
    config LEDS_RT4505
    tristate "LED support for RT4505 flashlight controller"
    depends on I2C && OF
    diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
    index 0acbddc..4665e8e 100644
    --- a/drivers/leds/flash/Makefile
    +++ b/drivers/leds/flash/Makefile
    @@ -1,6 +1,7 @@
    # SPDX-License-Identifier: GPL-2.0

    obj-$(CONFIG_LEDS_MT6360) += leds-mt6360.o
    +obj-$(CONFIG_LEDS_MT6370_FLASH) += leds-mt6370-flash.o
    obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o
    obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o
    obj-$(CONFIG_LEDS_KTD2692) += leds-ktd2692.o
    diff --git a/drivers/leds/flash/leds-mt6370-flash.c b/drivers/leds/flash/leds-mt6370-flash.c
    new file mode 100644
    index 00000000..dc00c33
    --- /dev/null
    +++ b/drivers/leds/flash/leds-mt6370-flash.c
    @@ -0,0 +1,573 @@
    +// SPDX-License-Identifier: GPL-2.0-only
    +/*
    + * Copyright (C) 2023 Richtek Technology Corp.
    + *
    + * Authors:
    + * Alice Chen <alice_chen@richtek.com>
    + * ChiYuan Huang <cy_huang@richtek.com>
    + */
    +
    +#include <linux/bitops.h>
    +#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/mutex.h>
    +#include <linux/platform_device.h>
    +#include <linux/property.h>
    +#include <linux/regmap.h>
    +
    +#include <media/v4l2-flash-led-class.h>
    +
    +enum {
    + MT6370_LED_FLASH1 = 0,
    + MT6370_LED_FLASH2,
    + MT6370_MAX_LEDS
    +};
    +
    +/* Virtual definition for multicolor */
    +
    +#define MT6370_REG_FLEDEN 0x17E
    +#define MT6370_REG_STRBTO 0x173
    +#define MT6370_REG_CHGSTAT2 0x1D1
    +#define MT6370_REG_FLEDSTAT1 0x1D9
    +#define MT6370_REG_FLEDISTRB(_id) (0x174 + 4 * (_id))
    +#define MT6370_REG_FLEDITOR(_id) (0x175 + 4 * (_id))
    +#define MT6370_ITORCH_MASK GENMASK(4, 0)
    +#define MT6370_ISTROBE_MASK GENMASK(6, 0)
    +#define MT6370_STRBTO_MASK GENMASK(6, 0)
    +#define MT6370_TORCHEN_MASK BIT(3)
    +#define MT6370_STROBEN_MASK BIT(2)
    +#define MT6370_FLCSEN_MASK(_id) BIT(MT6370_LED_FLASH2 - (_id))
    +#define MT6370_FLCSEN_MASK_ALL GENMASK(1, 0)
    +#define MT6370_FLEDCHGVINOVP_MASK BIT(3)
    +#define MT6370_FLED1STRBTO_MASK BIT(11)
    +#define MT6370_FLED2STRBTO_MASK BIT(10)
    +#define MT6370_FLED1STRB_MASK BIT(9)
    +#define MT6370_FLED2STRB_MASK BIT(8)
    +#define MT6370_FLED1SHORT_MASK BIT(7)
    +#define MT6370_FLED2SHORT_MASK BIT(6)
    +#define MT6370_FLEDLVF_MASK BIT(3)
    +
    +#define MT6370_LED_JOINT 2
    +#define MT6370_RANGE_FLED_REG 4
    +#define MT6370_ITORCH_MIN_uA 25000
    +#define MT6370_ITORCH_STEP_uA 12500
    +#define MT6370_ITORCH_MAX_uA 400000
    +#define MT6370_ITORCH_DOUBLE_MAX_uA 800000
    +#define MT6370_ISTRB_MIN_uA 50000
    +#define MT6370_ISTRB_STEP_uA 12500
    +#define MT6370_ISTRB_MAX_uA 1500000
    +#define MT6370_ISTRB_DOUBLE_MAX_uA 3000000
    +#define MT6370_STRBTO_MIN_US 64000
    +#define MT6370_STRBTO_STEP_US 32000
    +#define MT6370_STRBTO_MAX_US 2432000
    +
    +#define to_mt6370_led(ptr, member) container_of(ptr, struct mt6370_led, member)
    +
    +struct mt6370_led {
    + struct led_classdev_flash flash;
    + struct v4l2_flash *v4l2_flash;
    + struct mt6370_priv *priv;
    + u8 led_no;
    +};
    +
    +struct mt6370_priv {
    + struct regmap *regmap;
    + struct mutex lock;
    + unsigned int fled_strobe_used;
    + unsigned int fled_torch_used;
    + unsigned int leds_active;
    + unsigned int leds_count;
    + struct mt6370_led leds[];
    +};
    +
    +static int mt6370_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
    +{
    + struct mt6370_led *led = to_mt6370_led(lcdev, flash.led_cdev);
    + struct mt6370_priv *priv = led->priv;
    + u32 led_enable_mask = led->led_no == MT6370_LED_JOINT ? MT6370_FLCSEN_MASK_ALL :
    + MT6370_FLCSEN_MASK(led->led_no);
    + u32 enable_mask = MT6370_TORCHEN_MASK | led_enable_mask;
    + u32 val = level ? led_enable_mask : 0;
    + u32 curr;
    + int ret, i;
    +
    + mutex_lock(&priv->lock);
    +
    + /*
    + * There is only one set of flash control logic, and this flag is used to check if 'strobe'
    + * is currently being used.
    + */
    + if (priv->fled_strobe_used) {
    + dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
    + ret = -EBUSY;
    + goto unlock;
    + }
    +
    + if (level)
    + curr = priv->fled_torch_used | BIT(led->led_no);
    + else
    + curr = priv->fled_torch_used & ~BIT(led->led_no);
    +
    + if (curr)
    + val |= MT6370_TORCHEN_MASK;
    +
    + if (level) {
    + level -= 1;
    + if (led->led_no == MT6370_LED_JOINT) {
    + u32 flevel[MT6370_MAX_LEDS];
    +
    + /*
    + * There're two flash channels in MT6370. If joint flash output is used,
    + * torch current will be averaged output from both channels.
    + */
    + flevel[0] = level / 2;
    + flevel[1] = level - flevel[0];
    + for (i = 0; i < MT6370_MAX_LEDS; i++) {
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDITOR(i),
    + MT6370_ITORCH_MASK, flevel[i]);
    + if (ret)
    + goto unlock;
    + }
    + } else {
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDITOR(led->led_no),
    + MT6370_ITORCH_MASK, level);
    + if (ret)
    + goto unlock;
    + }
    + }
    +
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN, enable_mask, val);
    + if (ret)
    + goto unlock;
    +
    + priv->fled_torch_used = curr;
    +
    +unlock:
    + mutex_unlock(&priv->lock);
    + return ret;
    +}
    +
    +static int mt6370_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
    +{
    + /*
    + * Because of the current spikes when turning on the flash, the brightness should be kept
    + * by the LED framework. This empty function is used to prevent checking failure when
    + * led_classdev_flash registers ops.
    + */
    + return 0;
    +}
    +
    +static int _mt6370_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
    +{
    + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash);
    + struct mt6370_priv *priv = led->priv;
    + struct led_flash_setting *setting = &fl_cdev->brightness;
    + u32 val = (brightness - setting->min) / setting->step;
    + int ret, i;
    +
    + if (led->led_no == MT6370_LED_JOINT) {
    + u32 flevel[MT6370_MAX_LEDS];
    +
    + /*
    + * There're two flash channels in MT6370. If joint flash output is used, storbe
    + * current will be averaged output from both channels.
    + */
    + flevel[0] = val / 2;
    + flevel[1] = val - flevel[0];
    + for (i = 0; i < MT6370_MAX_LEDS; i++) {
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDISTRB(i),
    + MT6370_ISTROBE_MASK, flevel[i]);
    + if (ret)
    + break;
    + }
    + } else
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDISTRB(led->led_no),
    + MT6370_ISTROBE_MASK, val);
    +
    + return ret;
    +}
    +
    +static int mt6370_strobe_set(struct led_classdev_flash *fl_cdev, bool state)
    +{
    + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash);
    + struct mt6370_priv *priv = led->priv;
    + struct led_classdev *lcdev = &fl_cdev->led_cdev;
    + struct led_flash_setting *s = &fl_cdev->brightness;
    + u32 led_enable_mask = led->led_no == MT6370_LED_JOINT ? MT6370_FLCSEN_MASK_ALL :
    + MT6370_FLCSEN_MASK(led->led_no);
    + u32 enable_mask = MT6370_STROBEN_MASK | led_enable_mask;
    + u32 val = state ? led_enable_mask : 0;
    + u32 curr;
    + int ret;
    +
    + mutex_lock(&priv->lock);
    +
    + /*
    + * There is only one set of flash control logic, and this flag is used to check if 'torch'
    + * is currently being used.
    + */
    + if (priv->fled_torch_used) {
    + dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", priv->fled_torch_used);
    + ret = -EBUSY;
    + goto unlock;
    + }
    +
    + if (state)
    + curr = priv->fled_strobe_used | BIT(led->led_no);
    + else
    + curr = priv->fled_strobe_used & ~BIT(led->led_no);
    +
    + if (curr)
    + val |= MT6370_STROBEN_MASK;
    +
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN, enable_mask, val);
    + if (ret) {
    + dev_err(lcdev->dev, "[%d] control current source %d fail\n", led->led_no, state);
    + goto unlock;
    + }
    +
    + /*
    + * If the flash needs to turn on, configure the flash current to ramp up to the setting
    + * value. Otherwise, always revert to the minimum one.
    + */
    + ret = _mt6370_flash_brightness_set(fl_cdev, state ? s->val : s->min);
    + if (ret) {
    + dev_err(lcdev->dev, "[%d] Failed to set brightness\n", led->led_no);
    + goto unlock;
    + }
    +
    + /*
    + * For the flash to turn on/off, we must wait for HW ramping up/down time 5ms/500us to
    + * prevent the unexpected problem.
    + */
    + if (!priv->fled_strobe_used && curr)
    + usleep_range(5000, 6000);
    + else if (priv->fled_strobe_used && !curr)
    + usleep_range(500, 600);
    +
    + priv->fled_strobe_used = curr;
    +
    +unlock:
    + mutex_unlock(&priv->lock);
    + return ret;
    +}
    +
    +static int mt6370_strobe_get(struct led_classdev_flash *fl_cdev, bool *state)
    +{
    + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash);
    + struct mt6370_priv *priv = led->priv;
    +
    + mutex_lock(&priv->lock);
    + *state = !!(priv->fled_strobe_used & BIT(led->led_no));
    + mutex_unlock(&priv->lock);
    +
    + return 0;
    +}
    +
    +static int mt6370_timeout_set(struct led_classdev_flash *fl_cdev, u32 timeout)
    +{
    + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash);
    + struct mt6370_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, MT6370_REG_STRBTO, MT6370_STRBTO_MASK, val);
    +}
    +
    +static int mt6370_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
    +{
    + struct mt6370_led *led = to_mt6370_led(fl_cdev, flash);
    + struct mt6370_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, MT6370_REG_CHGSTAT2, &chg_stat);
    + if (ret)
    + return ret;
    +
    + ret = regmap_raw_read(priv->regmap, MT6370_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
    + if (ret)
    + return ret;
    +
    + switch (led->led_no) {
    + case MT6370_LED_FLASH1:
    + strobe_timeout_mask = MT6370_FLED1STRBTO_MASK;
    + fled_short_mask = MT6370_FLED1SHORT_MASK;
    + break;
    +
    + case MT6370_LED_FLASH2:
    + strobe_timeout_mask = MT6370_FLED2STRBTO_MASK;
    + fled_short_mask = MT6370_FLED2SHORT_MASK;
    + break;
    +
    + case MT6370_LED_JOINT:
    + strobe_timeout_mask = MT6370_FLED1STRBTO_MASK | MT6370_FLED2STRBTO_MASK;
    + fled_short_mask = MT6370_FLED1SHORT_MASK | MT6370_FLED2SHORT_MASK;
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + if (chg_stat & MT6370_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 & MT6370_FLEDLVF_MASK)
    + rfault |= LED_FAULT_UNDER_VOLTAGE;
    +
    + *fault = rfault;
    + return ret;
    +}
    +
    +static const struct led_flash_ops mt6370_flash_ops = {
    + .flash_brightness_set = mt6370_flash_brightness_set,
    + .strobe_set = mt6370_strobe_set,
    + .strobe_get = mt6370_strobe_get,
    + .timeout_set = mt6370_timeout_set,
    + .fault_get = mt6370_fault_get,
    +};
    +
    +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
    +static int mt6370_flash_external_strobe_set(struct v4l2_flash *v4l2_flash,
    + bool enable)
    +{
    + struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
    + struct mt6370_led *led = to_mt6370_led(flash, flash);
    + struct mt6370_priv *priv = led->priv;
    + u32 mask = led->led_no == MT6370_LED_JOINT ? MT6370_FLCSEN_MASK_ALL :
    + MT6370_FLCSEN_MASK(led->led_no);
    + u32 val = enable ? mask : 0;
    + int ret;
    +
    + mutex_lock(&priv->lock);
    +
    + ret = regmap_update_bits(priv->regmap, MT6370_REG_FLEDEN, mask, val);
    + if (ret)
    + goto unlock;
    +
    + if (enable)
    + priv->fled_strobe_used |= BIT(led->led_no);
    + else
    + priv->fled_strobe_used &= ~BIT(led->led_no);
    +
    +unlock:
    + mutex_unlock(&priv->lock);
    + return ret;
    +}
    +
    +static const struct v4l2_flash_ops v4l2_flash_ops = {
    + .external_strobe_set = mt6370_flash_external_strobe_set,
    +};
    +
    +static void mt6370_init_v4l2_flash_config(struct mt6370_led *led, struct v4l2_flash_config *cfg)
    +{
    + struct led_classdev *lcdev;
    + struct led_flash_setting *s = &cfg->intensity;
    +
    + lcdev = &led->flash.led_cdev;
    +
    + s->min = MT6370_ITORCH_MIN_uA;
    + s->step = MT6370_ITORCH_STEP_uA;
    + s->val = s->max = s->min + (lcdev->max_brightness - 1) * s->step;
    +
    + cfg->has_external_strobe = 1;
    + strscpy(cfg->dev_name, dev_name(lcdev->dev), sizeof(cfg->dev_name));
    +
    + cfg->flash_faults = LED_FAULT_SHORT_CIRCUIT | LED_FAULT_TIMEOUT |
    + LED_FAULT_INPUT_VOLTAGE | LED_FAULT_UNDER_VOLTAGE;
    +}
    +#else
    +static const struct v4l2_flash_ops v4l2_flash_ops;
    +static void mt6370_init_v4l2_flash_config(struct mt6370_led *led, struct v4l2_flash_config *cfg)
    +{
    +}
    +#endif
    +
    +static void mt6370_v4l2_flash_release(void *v4l2_flash)
    +{
    + v4l2_flash_release(v4l2_flash);
    +}
    +
    +static int mt6370_led_register(struct device *parent, struct mt6370_led *led,
    + struct fwnode_handle *fwnode)
    +{
    + struct led_init_data init_data = { .fwnode = fwnode };
    + struct v4l2_flash_config v4l2_config = {};
    + int ret;
    +
    + ret = devm_led_classdev_flash_register_ext(parent, &led->flash, &init_data);
    + if (ret)
    + return dev_err_probe(parent, ret, "Couldn't register flash %d\n", led->led_no);
    +
    + mt6370_init_v4l2_flash_config(led, &v4l2_config);
    + led->v4l2_flash = v4l2_flash_init(parent, fwnode, &led->flash, &v4l2_flash_ops,
    + &v4l2_config);
    + if (IS_ERR(led->v4l2_flash))
    + return dev_err_probe(parent, PTR_ERR(led->v4l2_flash),
    + "Failed to register %d v4l2 sd\n", led->led_no);
    +
    + return devm_add_action_or_reset(parent, mt6370_v4l2_flash_release, led->v4l2_flash);
    +}
    +
    +static u32 mt6370_clamp(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 mt6370_init_flash_properties(struct device *dev, struct mt6370_led *led,
    + struct fwnode_handle *fwnode)
    +{
    + struct led_classdev_flash *flash = &led->flash;
    + struct led_classdev *lcdev = &flash->led_cdev;
    + struct mt6370_priv *priv = led->priv;
    + struct led_flash_setting *s;
    + u32 sources[MT6370_MAX_LEDS];
    + u32 max_ua, val;
    + int i, ret, num;
    +
    + num = fwnode_property_count_u32(fwnode, "led-sources");
    + if (num < 1)
    + return dev_err_probe(dev, -EINVAL,
    + "Not specified or wrong number of led-sources\n");
    +
    + ret = fwnode_property_read_u32_array(fwnode, "led-sources", sources, num);
    + if (ret)
    + return ret;
    +
    + for (i = 0; i < num; i++) {
    + if (sources[i] >= MT6370_MAX_LEDS)
    + return -EINVAL;
    + if (priv->leds_active & BIT(sources[i]))
    + return -EINVAL;
    + priv->leds_active |= BIT(sources[i]);
    + }
    +
    + /* If both channels are specified in 'led-sources', joint flash output mode is used */
    + led->led_no = num == 2 ? MT6370_LED_JOINT : sources[0];
    +
    + max_ua = num == 2 ? MT6370_ITORCH_DOUBLE_MAX_uA : MT6370_ITORCH_MAX_uA;
    + val = MT6370_ITORCH_MIN_uA;
    + ret = fwnode_property_read_u32(fwnode, "led-max-microamp", &val);
    + if (!ret)
    + val = mt6370_clamp(val, MT6370_ITORCH_MIN_uA, max_ua, MT6370_ITORCH_STEP_uA);
    +
    + lcdev->max_brightness = (val - MT6370_ITORCH_MIN_uA) / MT6370_ITORCH_STEP_uA + 1;
    + lcdev->brightness_set_blocking = mt6370_torch_brightness_set;
    + lcdev->flags |= LED_DEV_CAP_FLASH;
    +
    + max_ua = num == 2 ? MT6370_ISTRB_DOUBLE_MAX_uA : MT6370_ISTRB_MAX_uA;
    + val = MT6370_ISTRB_MIN_uA;
    + ret = fwnode_property_read_u32(fwnode, "flash-max-microamp", &val);
    + if (!ret)
    + val = mt6370_clamp(val, MT6370_ISTRB_MIN_uA, max_ua, MT6370_ISTRB_STEP_uA);
    +
    + s = &flash->brightness;
    + s->min = MT6370_ISTRB_MIN_uA;
    + s->step = MT6370_ISTRB_STEP_uA;
    + s->val = s->max = val;
    +
    + /* Always configure to the minimum level when off to prevent flash current spikes. */
    + ret = _mt6370_flash_brightness_set(flash, s->min);
    + if (ret)
    + return ret;
    +
    +
    + val = MT6370_STRBTO_MIN_US;
    + ret = fwnode_property_read_u32(fwnode, "flash-max-timeout-us", &val);
    + if (!ret)
    + val = mt6370_clamp(val, MT6370_STRBTO_MIN_US, MT6370_STRBTO_MAX_US,
    + MT6370_STRBTO_STEP_US);
    +
    + s = &flash->timeout;
    + s->min = MT6370_STRBTO_MIN_US;
    + s->step = MT6370_STRBTO_STEP_US;
    + s->val = s->max = val;
    +
    + flash->ops = &mt6370_flash_ops;
    +
    + return 0;
    +}
    +
    +static int mt6370_led_probe(struct platform_device *pdev)
    +{
    + struct device *dev = &pdev->dev;
    + struct mt6370_priv *priv;
    + struct fwnode_handle *child;
    + size_t count;
    + int i = 0, ret;
    +
    + count = device_get_child_node_count(dev);
    + if (!count || count > MT6370_MAX_LEDS)
    + return dev_err_probe(dev, -EINVAL,
    + "No child node or node count over max led number %zu\n", count);
    +
    + priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL);
    + if (!priv)
    + return -ENOMEM;
    +
    + priv->leds_count = count;
    + mutex_init(&priv->lock);
    +
    + priv->regmap = dev_get_regmap(dev->parent, NULL);
    + if (!priv->regmap)
    + return dev_err_probe(dev, -ENODEV, "Failed to get parent regmap\n");
    +
    + device_for_each_child_node(dev, child) {
    + struct mt6370_led *led = priv->leds + i;
    +
    + led->priv = priv;
    +
    + ret = mt6370_init_flash_properties(dev, led, child);
    + if (ret) {
    + fwnode_handle_put(child);
    + return ret;
    + }
    +
    + ret = mt6370_led_register(dev, led, child);
    + if (ret) {
    + fwnode_handle_put(child);
    + return ret;
    + }
    +
    + i++;
    + }
    +
    + return 0;
    +}
    +
    +static const struct of_device_id mt6370_led_of_id[] = {
    + { .compatible = "mediatek,mt6370-flashlight" },
    + {}
    +};
    +MODULE_DEVICE_TABLE(of, mt6370_led_of_id);
    +
    +static struct platform_driver mt6370_led_driver = {
    + .driver = {
    + .name = "mt6370-flashlight",
    + .of_match_table = mt6370_led_of_id,
    + },
    + .probe = mt6370_led_probe,
    +};
    +module_platform_driver(mt6370_led_driver);
    +
    +MODULE_AUTHOR("Alice Chen <alice_chen@richtek.com>");
    +MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
    +MODULE_DESCRIPTION("MT6370 FLASH LED Driver");
    +MODULE_LICENSE("GPL");
    --
    2.7.4
    \
     
     \ /
      Last update: 2023-03-27 00:52    [W:3.144 / U:0.084 seconds]
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