Re: [PATCH v4 2/2] leds: mt6360: Add LED driver for MT6360

From: Gene Chen
Date: Thu Sep 24 2020 - 02:21:25 EST

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Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx> 於 2020年9月24日週四上午5:49寫道：

>
> Hi Gene,
>
> Thank you for the update. I have some more comments below.
>
> On 9/23/20 2:50 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 | 705 +++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 717 insertions(+)
> > create mode 100644 drivers/leds/leds-mt6360.c
> >
> > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> > index 1c181df..5561b08 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.
> > +
> > 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..1c3486e
> > --- /dev/null
> > +++ b/drivers/leds/leds-mt6360.c
> > @@ -0,0 +1,705 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +
> > +#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,
>
> One question about these ISINKs - how are they exploited in your device?
> Are these LEDs used to indicate camera activity or it is one RGB LED
> for status? And what functionality has the remaining amber one (sticking
> to the naming from your DT bindings)?
>
> Can you share how the documenation for this device describes the purpose
> of these sinks, if it does it at all?
>
> I got probably mislead by your naming in the driver and got fixed on
> their function as camera activity indicators, for which V4L2 has
> support. If that is not the case, then you'd better switch to using
> multicolor framework for all four "indicator" LEDs.
>

It's one RGB LED for status, not for camera.

The MT6360 integrates a three-channel RGB LED driver, designed to
provide a variety of lighting effects for mobile device applications.
The RGB LED driver includes a smart LED string controller, and it can
drive 3 channels of LEDs with a sink current of up to 24mA. The
default setting of RGB_ISINK1 is auto mode for TA charging indicator,
and RGB_ISINK1 also supports software mode. It provides three
operation modes for the RGB LEDs: flash mode, breath mode, and
register mode. The device can increase or decrease the brightness of
the RGB LEDs upon command via the I2C interface. The RGB_ISINK4
provide more sink current up to 150mA, which we can moonlight mode.

Do you mean we should remove "isink register v4l2 device, only need
register ledclass device"?

> > + 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)
> > +
> > +#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_ISNK1_STEPUA 2000
> > +#define MT6360_ISNK1_MAXUA 24000
> > +#define MT6360_ISNK4_STEPUA 5000
> > +#define MT6360_ISNK4_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_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;
> > + 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_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;
>
> You meed mutex protection in all functions acessing device registers.
>

ACK

> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no),
> > + MT6360_ISNK_MASK, level);
> > + if (ret)
> > + return ret;
> > +
> > + return regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
> > +}
> > +
> > +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;
>
> Above assignment must be made under mutex.
>

ACK

> > + int ret;
> > +
> > + /* 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);
> > + return -EBUSY;
> > + }
> > +
> > + 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;
>
> Ditto. And everything between as well of course.
>

ACK

> > +
> > + return 0;
> > +}
> > +
> > +static int mt6360_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> > +{
> > + /*
> > + * Due to the current spike when turning on flash, only let brightness keep by framework
>
> s/keep by/to be kept/
>
> > + * This empty function is used to prevent led_classdev_flash register ops check
>
> s/led_classdev_flash/led_classdev_flash()/
> s/check/check failure/
>
> And please put dots at the end of sentences.
>

ACK

> > + */
> > + 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;
> > +
> > + /* 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);
> > + return -EBUSY;
> > + }
> > +
> > + 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;
> > + }
> > +
> > + /*
> > + * 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)
> > + return ret;
> > +
> > + /* 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;
> > + 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_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;
>
> level++ fits better here.
>

ACK

> > + 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;
> > +
> > + ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, mask, val);
> > + 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_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> > +{
> > + struct led_classdev *lcdev;
> > + struct led_flash_setting *s = &config->intensity;
> > +
> > + switch (led->led_no) {
> > + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> > + lcdev = &led->isnk;
> > +
> > + if (led->led_no == MT6360_LED_ISNK4)
> > + s->step = MT6360_ISNK4_STEPUA;
> > + else
> > + s->step = MT6360_ISNK1_STEPUA;
> > +
> > + s->min = 0;
> > + s->val = lcdev->brightness * s->step;
> > + s->max = lcdev->max_brightness * s->step;
> > + break;
> > + default:
> > + 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;
> > + }
> > +
> > + snprintf(config->dev_name, sizeof(config->dev_name), "%s", lcdev->name);
>
> You're using devm_led_classdev_register_ext() so lcdev->name remains
> uninitialized, but even if you used non-ext API, it wouldn't necessary
> contain the final LED name, if renaming had occurred.
>
> Please use below instead:
>
> strscpy(config->dev_name, lcdev->dev->kobj.name, sizeof(config->dev_name));
>
>

ACK

> > +}
> > +#else
> > +static const struct v4l2_flash_ops v4l2_flash_ops;
> > +
> > +static void mt6360_init_v4l2_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;
> > +
> > + switch (led->led_no) {
> > + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> > + if (led->led_no == 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;
> > + }
> > + }
> > +
> > + 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;
> > + }
> > +
> > + mt6360_init_v4l2_config(led, &v4l2_config);
> > + led->v4l2_flash = v4l2_flash_indicator_init(parent, init_data->fwnode, &led->isnk,
> > + &v4l2_config);
> > + 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_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 *isnk = &led->isnk;
> > + struct mt6360_priv *priv = led->priv;
> > + u32 step_uA, max_uA;
> > + u32 val;
> > + int ret;
> > +
> > + if (led->led_no == MT6360_LED_ISNK4) {
> > + step_uA = MT6360_ISNK4_STEPUA;
> > + max_uA = MT6360_ISNK4_MAXUA;
> > + } else {
> > + step_uA = MT6360_ISNK1_STEPUA;
> > + max_uA = MT6360_ISNK1_MAXUA;
> > + }
> > +
> > + 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 step\n");
> > + val = 1 * step_uA;
> > + } else
> > + val = clamp_align(val, 0, max_uA, step_uA);
> > +
> > + isnk->max_brightness = val / step_uA;
> > + isnk->brightness_set_blocking = mt6360_isnk_brightness_set;
> > +
> > + fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
> > + &isnk->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)
>
> Please add dev_err() here.
>

dev_err(&pdev->dev, "No child node or node count over max led number
%d\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;
> > +
> > + 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;
> > +
> > + ret = fwnode_property_read_u32(child, "reg", &reg);
> > + if (ret)
> > + goto out_flash_release;
> > +
> > + if (reg >= MT6360_MAX_LEDS || priv->leds_active & BIT(reg))
> > + return -EINVAL;
> > + 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;
> > +
> > + switch (reg) {
> > + case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> > + ret = mt6360_init_isnk_properties(led, &init_data);
> > + break;
> > + default:
> > + 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@xxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("MT6360 LED Driver");
> > +MODULE_LICENSE("GPL v2");
> >
>
> --
> Best regards,
> Jacek Anaszewski

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