[PATCH v11 5/5] leds: mt6360: Add LED driver for MT6360

Gene Chen
2020-12-02T10:48:28Z

From: Gene Chen <gene_chen@richtek.com>

Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
3-channel RGB LED support Register/Flash/Breath Mode, and 1-channel for
moonlight LED.

Signed-off-by: Gene Chen <gene_chen@richtek.com>
---
drivers/leds/Kconfig | 13 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-mt6360.c | 827 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 841 insertions(+)
create mode 100644 drivers/leds/leds-mt6360.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 1c181df..4f533bc 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -271,6 +271,19 @@ 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 && OF
+ depends on LEDS_CLASS_FLASH || !LEDS_CLASS_FLASH
+ depends on LEDS_CLASS_MULTICOLOR || !LEDS_CLASS_MULTICOLOR
+ 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..42d18a8
--- /dev/null
+++ b/drivers/leds/leds-mt6360.c
@@ -0,0 +1,827 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#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/led-class-multicolor.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 {
+ MT6360_LED_ISNK1 = 0,
+ MT6360_LED_ISNK2,
+ MT6360_LED_ISNK3,
+ MT6360_LED_ISNKML,
+ 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)
+
+/* Virtual definition for multicolor */
+#define MT6360_VIRTUAL_MULTICOLOR (MT6360_MAX_LEDS + 1)
+#define MULTICOLOR_NUM_CHANNELS 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_ISNKRGB_STEPUA 2000
+#define MT6360_ISNKRGB_MAXUA 24000
+#define MT6360_ISNKML_STEPUA 5000
+#define MT6360_ISNKML_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_mc mc;
+ 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 mutex lock;
+ 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_mc_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
+{
+ struct led_classdev_mc *mccdev = lcdev_to_mccdev(lcdev);
+ struct mt6360_led *led = container_of(mccdev, struct mt6360_led, mc);
+ struct mt6360_priv *priv = led->priv;
+ u32 real_bright, enable_mask = 0, enable = 0;
+ int i, ret;
+
+ mutex_lock(&priv->lock);
+
+ led_mc_calc_color_components(mccdev, level);
+
+ for (i = 0; i < mccdev->num_colors; i++) {
+ struct mc_subled *subled = mccdev->subled_info + i;
+
+ real_bright = min(lcdev->max_brightness, subled->brightness);
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(i), MT6360_ISNK_MASK,
+ real_bright);
+ if (ret)
+ goto out;
+
+ enable_mask |= MT6360_ISNK_ENMASK(subled->channel);
+ if (real_bright)
+ enable |= MT6360_ISNK_ENMASK(subled->channel);
+ }
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, enable);
+
+out:
+ mutex_unlock(&priv->lock);
+ return ret;
+}
+
+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;
+
+ mutex_lock(&priv->lock);
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no), MT6360_ISNK_MASK,
+ level);
+ if (ret)
+ goto out;
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
+
+out:
+ mutex_unlock(&priv->lock);
+ return ret;
+}
+
+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;
+
+ mutex_lock(&priv->lock);
+
+ /* 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);
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ 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)
+ goto unlock;
+ }
+
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
+ if (ret)
+ goto unlock;
+
+ priv->fled_torch_used = curr;
+
+unlock:
+ mutex_unlock(&priv->lock);
+ return ret;
+}
+
+static int mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
+{
+ /*
+ * Due to the current spike when turning on flash, let brightness to be kept by framework.
+ * This empty function is used to prevent led_classdev_flash register ops check failure.
+ */
+ 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;
+
+ mutex_lock(&priv->lock);
+
+ /* 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);
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ 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);
+ goto unlock;
+ }
+
+ /*
+ * 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)
+ goto unlock;
+
+ /* 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;
+
+unlock:
+ mutex_unlock(&priv->lock);
+ return ret;
+}
+
+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;
+
+ mutex_lock(&priv->lock);
+ *state = !!(priv->fled_strobe_used & BIT(led->led_no));
+ mutex_unlock(&priv->lock);
+
+ 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;
+ int ret;
+
+ mutex_lock(&priv->lock);
+ ret = regmap_update_bits(priv->regmap, MT6360_REG_STRBTO, MT6360_STRBTO_MASK, val);
+ mutex_unlock(&priv->lock);
+
+ return ret;
+}
+
+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;
+
+ mutex_lock(&priv->lock);
+ ret = regmap_read(priv->regmap, MT6360_REG_CHGSTAT2, &chg_stat);
+ if (ret)
+ goto unlock;
+
+ ret = regmap_raw_read(priv->regmap, MT6360_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
+ if (ret)
+ goto unlock;
+
+ 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;
+unlock:
+ mutex_unlock(&priv->lock);
+ return ret;
+}
+
+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;
+
+ mutex_lock(&priv->lock);
+
+ ret = regmap_update_bits(priv->regmap, MT6360_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 = mt6360_flash_external_strobe_set,
+};
+
+static void mt6360_init_v4l2_flash_config(struct mt6360_led *led, struct v4l2_flash_config *config)
+{
+ struct led_classdev *lcdev;
+ struct led_flash_setting *s = &config->intensity;
+
+ 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;
+ strscpy(config->dev_name, lcdev->dev->kobj.name, sizeof(config->dev_name));
+
+ config->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 mt6360_init_v4l2_flash_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;
+
+ if ((led->led_no == MT6360_LED_ISNK1 || led->led_no == MT6360_VIRTUAL_MULTICOLOR) &&
+ (priv->leds_active & BIT(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;
+ }
+ }
+
+ switch (led->led_no) {
+ case MT6360_VIRTUAL_MULTICOLOR:
+ ret = mt6360_mc_brightness_set(&led->mc.led_cdev, LED_OFF);
+ if (ret) {
+ dev_err(parent, "Failed to init multicolor brightness\n");
+ return ret;
+ }
+
+ ret = devm_led_classdev_multicolor_register_ext(parent, &led->mc, init_data);
+ if (ret) {
+ dev_err(parent, "Couldn't register multicolor\n");
+ return ret;
+ }
+ break;
+ case MT6360_LED_ISNK1 ... MT6360_LED_ISNKML:
+ 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;
+ }
+ 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_flash_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 *lcdev;
+ struct mt6360_priv *priv = led->priv;
+ struct fwnode_handle *child;
+ u32 step_uA = MT6360_ISNKRGB_STEPUA, max_uA = MT6360_ISNKRGB_MAXUA;
+ u32 val;
+ int num_color = 0, ret;
+
+ if (led->led_no == MT6360_VIRTUAL_MULTICOLOR) {
+ struct mc_subled *sub_led;
+
+ sub_led = devm_kzalloc(priv->dev, sizeof(*sub_led) * MULTICOLOR_NUM_CHANNELS,
+ GFP_KERNEL);
+ if (!sub_led)
+ return -ENOMEM;
+
+ fwnode_for_each_child_node(init_data->fwnode, child) {
+ u32 reg, color;
+
+ ret = fwnode_property_read_u32(child, "reg", &reg);
+ if (ret || reg > MT6360_LED_ISNK3 || priv->leds_active & BIT(reg))
+ return -EINVAL;
+
+ ret = fwnode_property_read_u32(child, "color", &color);
+ if (ret) {
+ dev_err(priv->dev, "led %d, no color specified\n", led->led_no);
+ return ret;
+ }
+
+ priv->leds_active |= BIT(reg);
+ sub_led[num_color].color_index = color;
+ sub_led[num_color].channel = reg;
+ num_color++;
+ }
+
+ if (num_color < 2) {
+ dev_err(priv->dev, "Multicolor must include 2 or more led channel\n");
+ return -EINVAL;
+ }
+
+ led->mc.num_colors = num_color;
+ led->mc.subled_info = sub_led;
+
+ lcdev = &led->mc.led_cdev;
+ lcdev->brightness_set_blocking = mt6360_mc_brightness_set;
+ } else {
+ if (led->led_no == MT6360_LED_ISNKML) {
+ step_uA = MT6360_ISNKML_STEPUA;
+ max_uA = MT6360_ISNKML_MAXUA;
+ }
+
+ lcdev = &led->isnk;
+ lcdev->brightness_set_blocking = mt6360_isnk_brightness_set;
+ }
+
+ 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 = step_uA;
+ } else
+ val = clamp_align(val, 0, max_uA, step_uA);
+
+ lcdev->max_brightness = val / step_uA;
+
+ fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
+ &lcdev->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) {
+ dev_err(&pdev->dev, "No child node or node count over max led number %lu\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;
+ mutex_init(&priv->lock);
+
+ 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, led_color;
+
+ ret = fwnode_property_read_u32(child, "color", &led_color);
+ if (ret)
+ goto out_flash_release;
+
+ if (led_color == LED_COLOR_ID_RGB || led_color == LED_COLOR_ID_MULTI)
+ reg = MT6360_VIRTUAL_MULTICOLOR;
+ else {
+ ret = fwnode_property_read_u32(child, "reg", &reg);
+ if (ret)
+ goto out_flash_release;
+
+ if (reg >= MT6360_MAX_LEDS) {
+ ret = -EINVAL;
+ goto out_flash_release;
+ }
+ }
+
+ if (priv->leds_active & BIT(reg)) {
+ ret = -EINVAL;
+ goto out_flash_release;
+ }
+ 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;
+
+ if (reg == MT6360_VIRTUAL_MULTICOLOR ||
+ (reg >= MT6360_LED_ISNK1 && reg <= MT6360_LED_ISNKML))
+ ret = mt6360_init_isnk_properties(led, &init_data);
+ else
+ 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 <gene_chen@richtek.com>");
+MODULE_DESCRIPTION("MT6360 LED Driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4