Hi Gene,
Thanks for the update.
On 9/7/20 12:27 PM, Gene Chen wrote:
From: Gene Chen <gene_chen@xxxxxxxxxxx>
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 <gene_chen@xxxxxxxxxxx>
---
drivers/leds/Kconfig | 11 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-mt6360.c | 681 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 693 insertions(+)
create mode 100644 drivers/leds/leds-mt6360.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1c181df..94a6d83 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.
+ Includes Low-VF and short protection.
+
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..bd6fa48
--- /dev/null
+++ b/drivers/leds/leds-mt6360.c
@@ -0,0 +1,681 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright (C) 2020 MediaTek Inc.
+//
+// Author: Gene Chen <gene_chen@xxxxxxxxxxx>
+
+#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 0x1F
+#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)
+
+/* 0 means led_off, add one for dummy */
+#define MT6360_ISNK1_MAXLEVEL 13
+#define MT6360_ISNK4_MAXLEVEL 31
+
+#define MT6360_ITORCH_MIN 25000
+#define MT6360_ITORCH_STEP 12500
+#define MT6360_ITORCH_MAX 400000
+#define MT6360_ISTRB_MIN 50000
+#define MT6360_ISTRB_STEP 12500
+#define MT6360_ISTRB_MAX 1500000
+#define MT6360_STRBTO_MIN 64000
+#define MT6360_STRBTO_STEP 32000
+#define MT6360_STRBTO_MAX 2432000
+
+#define FLED_TORCH_FLAG_MASK 0x0c
+#define FLED_TORCH_FLAG_SHFT 2
+#define FLED_STROBE_FLAG_MASK 0x03
+
+#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;
+ struct mt6360_led *leds[MT6360_MAX_LEDS];
+ unsigned int fled_strobe_used;
+ unsigned int fled_torch_used;
+};
+
+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;
+
+ dev_dbg(lcdev->dev, "[%d] brightness %d\n", led->led_no, level);
+
+ if (level) {
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no),
+ MT6360_ISNK_MASK, level - 1);
+ if (ret)
+ return ret;
+ }
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+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;
+
+ dev_dbg(lcdev->dev, "[%d] brightness %d\n", led->led_no, level);
+ if (priv->fled_strobe_used) {
+ dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
Doesn't hardware handle that? IOW, what happens when you have enabled
both torch and flash? If flash just overrides torch mode, than you
should not prevent enabling torch in this case.
+ return -EINVAL;
+ }
+
+ 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_strobe_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
s/strobe_brightness_set/flash_brightness_set/
Let's stick to the op name.
+{
+ struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
+ struct led_classdev *lcdev = &fl_cdev->led_cdev;
It would be good to add comment here explaining why this function
doesn't do anything.
+ dev_dbg(lcdev->dev, "[%d] strobe brightness %d\n", led->led_no, brightness);
+ return 0;
+}
+
+static int _mt6360_strobe_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
s/strobe_brightness_set/flash_brightness_set/
+{
+ 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;
+
+ dev_dbg(lcdev->dev, "[%d] strobe state %d\n", led->led_no, state);
+ if (priv->fled_torch_used) {
+ dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", priv->fled_torch_used);
Similar comment as in case of enabling torch mode above.
If flash overrides torch then we're OK without this guard.
+ return -EINVAL;
+ }
+
+ 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;
+ }
+
+ /* used to prevent flash current spike when torch on */
+ ret = _mt6360_strobe_brightness_set(fl_cdev, state ? s->val : s->min);
+ if (ret)
+ return ret;
+
+ 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_strobe_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), ®val);
+ if (ret)
+ return ret;
+ level = regval & MT6360_ISNK_MASK;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_RGBEN, ®val);
+ if (ret)
+ return ret;
+
+ if (regval & MT6360_ISNK_ENMASK(led->led_no))
+ level += 1;
+ else
+ 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_isnk_register(struct device *parent, struct mt6360_led *led,
+ struct led_init_data *init_data)
+{
+ struct mt6360_priv *priv = led->priv;
+ int ret;
+
+ if (led->led_no == MT6360_LED_ISNK1) {
+ /* change isink to sw mode */
+ 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;
+ }
You probably want also to register V4L2 indicator sub-device.
See drivers/leds/leds-as3645a.c and look for the
v4l2_flash_indicator_init() for reference.
+ return 0;
+}
+
+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), ®val);
+ if (ret)
+ return ret;
+ level = regval & MT6360_ITORCH_MASK;
+
+ ret = regmap_read(priv->regmap, MT6360_REG_FLEDEN, ®val);
+ 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 enable_mask = MT6360_FLCSEN_MASK(led->led_no);
+ int ret;
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask,
+ enable ? enable_mask : 0);
+ 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_flash_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
+{
+ struct led_classdev_flash *flash = &led->flash;
+ struct led_classdev *lcdev = &flash->led_cdev;
+ struct led_flash_setting *s = &config->intensity;
+
+ snprintf(config->dev_name, sizeof(config->dev_name), "%s", lcdev->name);
+
+ s->min = MT6360_ITORCH_MIN;
+ s->step = MT6360_ITORCH_STEP;
+ s->val = s->max = (s->min) + (lcdev->max_brightness - 1) * s->step;
+
+ config->has_external_strobe = 1;
+}
+#else
+static const struct v4l2_flash_ops v4l2_flash_ops;
+
+static void mt6360_flash_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
+{
+}
+#endif
+
+static int mt6360_flash_register(struct device *parent, struct mt6360_led *led,
+ struct led_init_data *init_data)
+{
+ struct v4l2_flash_config v4l2_config = {0};
+ int ret;
+
+ 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_flash_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 int mt6360_init_isnk_properties(struct mt6360_led *led, struct led_init_data *init_data)
+{
+ struct led_classdev *isnk = &led->isnk;
+
+ if (led->led_no == MT6360_LED_ISNK4)
+ isnk->max_brightness = MT6360_ISNK4_MAXLEVEL;
+ else
+ isnk->max_brightness = MT6360_ISNK1_MAXLEVEL;
+
+ isnk->brightness_set_blocking = mt6360_isnk_brightness_set;
+
+ fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
+ &isnk->default_trigger);
+
+ return 0;
+}
+
+static void clamp_align(u32 *v, u32 min, u32 max, u32 step)
+{
+ *v = clamp_val(*v, min, max);
+ if (step > 1)
+ *v = (*v - min) / step * step + min;
+}
+
+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 led_flash_setting *s;
+ u32 val;
+ int ret;
+
+ ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
+ if (ret)
+ val = MT6360_ITORCH_MIN;
In case of missing property I would print warning and inform the user
that we're defaulting to min value. Same applies to similar occurrences
below.
+ else
+ clamp_align(&val, MT6360_ITORCH_MIN, MT6360_ITORCH_MAX, MT6360_ITORCH_STEP);
+
+ lcdev->max_brightness = (val - MT6360_ITORCH_MIN) / MT6360_ITORCH_STEP + 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)
+ val = MT6360_ISTRB_MIN;
+ else
+ clamp_align(&val, MT6360_ISTRB_MIN, MT6360_ISTRB_MAX, MT6360_ISTRB_STEP);
+
+ s = &flash->brightness;
+ s->min = MT6360_ISTRB_MIN;
+ s->step = MT6360_ISTRB_STEP;
+ s->val = s->max = val;
+
+ /* always configure as min level when off to prevent flash current spike */
+ ret = _mt6360_strobe_brightness_set(flash, s->min);
+ if (ret)
+ return ret;
+
+ ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-timeout-us", &val);
+ if (ret)
+ val = MT6360_STRBTO_MIN;
+ else
+ clamp_align(&val, MT6360_STRBTO_MIN, MT6360_STRBTO_MAX, MT6360_STRBTO_STEP);
+
+ s = &flash->timeout;
+ s->min = MT6360_STRBTO_MIN;
+ s->step = MT6360_STRBTO_STEP;
+ 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 *str;
+
+ if (!fwnode_property_read_string(init_data->fwnode, "default-state", &str)) {
+ if (!strcmp(str, "on"))
+ led->default_state = STATE_ON;
+ else if (!strcmp(str, "keep"))
+ led->default_state = STATE_KEEP;
+ else
+ led->default_state = STATE_OFF;
+ }
+
+ return 0;
+}
+
+static int mt6360_led_probe(struct platform_device *pdev)
+{
+ struct mt6360_priv *priv;
+ struct fwnode_handle *child;
+ int i, ret;
+
+ ret = device_get_child_node_count(&pdev->dev);
+ if (!ret || ret > MT6360_MAX_LEDS)
+ return -EINVAL;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ 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;
+ struct led_init_data init_data = { .fwnode = child, };
+ u32 reg;
+
+ ret = fwnode_property_read_u32(child, "reg", ®);
+ if (ret || reg >= MT6360_MAX_LEDS || priv->leds[reg]) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+ if (!led) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ led->led_no = reg;
+ led->priv = priv;
+
+ ret = mt6360_init_common_properties(led, &init_data);
+ if (ret)
+ goto out;
+
+ switch (reg) {
+ case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
+ ret = mt6360_init_isnk_properties(led, &init_data);
+ if (ret)
+ goto out;
+
+ ret = mt6360_isnk_register(&pdev->dev, led, &init_data);
+ break;
+ default:
+ ret = mt6360_init_flash_properties(led, &init_data);
+ if (ret)
+ goto out;
+
+ ret = mt6360_flash_register(&pdev->dev, led, &init_data);
+ }
+
+ if (ret)
+ goto out;
+
+ priv->leds[reg] = led;
+ }
+
+ platform_set_drvdata(pdev, priv);
+ return 0;
+out:
+ for (i = MT6360_LED_FLASH1; i <= MT6360_LED_FLASH2; i++) {
+ struct mt6360_led *led = priv->leds[i];
+
+ if (led && led->v4l2_flash)
+ v4l2_flash_release(led->v4l2_flash);
+
+ }
+
+ return ret;
+}
+
+static int mt6360_led_remove(struct platform_device *pdev)
+{
+ struct mt6360_priv *priv = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = MT6360_LED_FLASH1; i <= MT6360_LED_FLASH2; i++) {
+ struct mt6360_led *led = priv->leds[i];
+
+ if (led && led->v4l2_flash)
+ v4l2_flash_release(led->v4l2_flash);
+
+ }
You're using this for loop twice, so it would be nice to wrap
it with a function to avoid code redundancy.
+
+ 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 <gene_chen@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("MT6360 Led Driver");
+MODULE_LICENSE("GPL v2");
--
Best regards,
Jacek Anaszewski
