Received-SPF: pass (google.com: domain of linux-kernel+bounces-140469-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.48.161 as permitted sender) client-ip=147.75.48.161;
Date: Thu, 11 Apr 2024 13:48:55 +0100
From: Lee Jones <lee@kernel.org>
To: git@apitzsch.eu
Cc: Pavel Machek <pavel@ucw.cz>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	"Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	linux-leds@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
	linux-arm-msm@vger.kernel.org,
	~postmarketos/upstreaming@lists.sr.ht, phone-devel@vger.kernel.org
Subject: Re: [PATCH v2 2/3] leds: sy7802: Add support for Silergy SY7802
 flash LED controller
Message-ID: <20240411124855.GJ1980182@google.com>
References: <20240401-sy7802-v2-0-1138190a7448@apitzsch.eu>
 <20240401-sy7802-v2-2-1138190a7448@apitzsch.eu>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20240401-sy7802-v2-2-1138190a7448@apitzsch.eu>

On Mon, 01 Apr 2024, André Apitzsch via B4 Relay wrote:

> From: André Apitzsch <git@apitzsch.eu>
> 
> Add support for SY7802 flash LED controller. It can support up to 1.8A
> flash current.

This is a very small commit message for a 500+ line change!

Please, tell us more.

> Signed-off-by: André Apitzsch <git@apitzsch.eu>
> ---
>  drivers/leds/flash/Kconfig       |  11 +
>  drivers/leds/flash/Makefile      |   1 +
>  drivers/leds/flash/leds-sy7802.c | 532 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 544 insertions(+)
> 
> diff --git a/drivers/leds/flash/Kconfig b/drivers/leds/flash/Kconfig
> index 809b6d98bb3e..f39f0bfe6eef 100644
> --- a/drivers/leds/flash/Kconfig
> +++ b/drivers/leds/flash/Kconfig
> @@ -121,4 +121,15 @@ config LEDS_SGM3140
>  	  This option enables support for the SGM3140 500mA Buck/Boost Charge
>  	  Pump LED Driver.
>  
> +config LEDS_SY7802
> +	tristate "LED support for the Silergy SY7802"
> +	depends on I2C && OF
> +	depends on GPIOLIB
> +	select REGMAP_I2C
> +	help
> +	  This option enables support for the SY7802 flash LED controller.
> +	  SY7802 includes torch and flash functions with programmable current.
> +
> +	  This driver can be built as a module, it will be called "leds-sy7802".
> +
>  endif # LEDS_CLASS_FLASH
> diff --git a/drivers/leds/flash/Makefile b/drivers/leds/flash/Makefile
> index 91d60a4b7952..48860eeced79 100644
> --- a/drivers/leds/flash/Makefile
> +++ b/drivers/leds/flash/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_LEDS_QCOM_FLASH)	+= leds-qcom-flash.o
>  obj-$(CONFIG_LEDS_RT4505)	+= leds-rt4505.o
>  obj-$(CONFIG_LEDS_RT8515)	+= leds-rt8515.o
>  obj-$(CONFIG_LEDS_SGM3140)	+= leds-sgm3140.o
> +obj-$(CONFIG_LEDS_SY7802)	+= leds-sy7802.o
> diff --git a/drivers/leds/flash/leds-sy7802.c b/drivers/leds/flash/leds-sy7802.c
> new file mode 100644
> index 000000000000..c03a571b0e08
> --- /dev/null
> +++ b/drivers/leds/flash/leds-sy7802.c
> @@ -0,0 +1,532 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Silergy SY7802 flash LED driver with I2C interface
> + *
> + * Copyright 2024 André Apitzsch <git@apitzsch.eu>
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/led-class-flash.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +
> +#define SY7802_MAX_LEDS 2
> +#define SY7802_LED_JOINT 2
> +
> +#define SY7802_REG_ENABLE		0x10
> +#define SY7802_REG_TORCH_BRIGHTNESS	0xa0
> +#define SY7802_REG_FLASH_BRIGHTNESS	0xb0
> +#define SY7802_REG_FLASH_DURATION	0xc0
> +#define SY7802_REG_FLAGS		0xd0
> +#define SY7802_REG_CONFIG_1		0xe0
> +#define SY7802_REG_CONFIG_2		0xf0
> +#define SY7802_REG_VIN_MONITOR		0x80
> +#define SY7802_REG_LAST_FLASH		0x81
> +#define SY7802_REG_VLED_MONITOR		0x30
> +#define SY7802_REG_ADC_DELAY		0x31
> +#define SY7802_REG_DEV_ID		0xff
> +
> +#define SY7802_MODE_OFF		0
> +#define SY7802_MODE_TORCH	2
> +#define SY7802_MODE_FLASH	3
> +#define SY7802_MODE_MASK	GENMASK(1, 0)
> +
> +#define SY7802_LEDS_SHIFT	3
> +#define SY7802_LEDS_MASK(_id)	(BIT(_id) << SY7802_LEDS_SHIFT)
> +#define SY7802_LEDS_MASK_ALL	(SY7802_LEDS_MASK(0) | SY7802_LEDS_MASK(1))
> +
> +#define SY7802_TORCH_CURRENT_SHIFT	3
> +#define SY7802_TORCH_CURRENT_MASK(_id) \
> +	(GENMASK(2, 0) << (SY7802_TORCH_CURRENT_SHIFT * (_id)))
> +#define SY7802_TORCH_CURRENT_MASK_ALL \
> +	(SY7802_TORCH_CURRENT_MASK(0) | SY7802_TORCH_CURRENT_MASK(1))
> +
> +#define SY7802_FLASH_CURRENT_SHIFT	4
> +#define SY7802_FLASH_CURRENT_MASK(_id) \
> +	(GENMASK(3, 0) << (SY7802_FLASH_CURRENT_SHIFT * (_id)))
> +#define SY7802_FLASH_CURRENT_MASK_ALL \
> +	(SY7802_FLASH_CURRENT_MASK(0) | SY7802_FLASH_CURRENT_MASK(1))
> +
> +#define SY7802_TIMEOUT_DEFAULT_US	512000U
> +#define SY7802_TIMEOUT_MIN_US		32000U
> +#define SY7802_TIMEOUT_MAX_US		1024000U
> +#define SY7802_TIMEOUT_STEPSIZE_US	32000U
> +
> +#define SY7802_TORCH_BRIGHTNESS_MAX 8
> +
> +#define SY7802_FLASH_BRIGHTNESS_DEFAULT	14
> +#define SY7802_FLASH_BRIGHTNESS_MIN	0
> +#define SY7802_FLASH_BRIGHTNESS_MAX	15
> +#define SY7802_FLASH_BRIGHTNESS_STEP	1

Much nicer to read if everything was aligned.

> +#define SY7802_FLAG_TIMEOUT			(1 << 0)
> +#define SY7802_FLAG_THERMAL_SHUTDOWN		(1 << 1)
> +#define SY7802_FLAG_LED_FAULT			(1 << 2)
> +#define SY7802_FLAG_TX1_INTERRUPT		(1 << 3)
> +#define SY7802_FLAG_TX2_INTERRUPT		(1 << 4)
> +#define SY7802_FLAG_LED_THERMAL_FAULT		(1 << 5)
> +#define SY7802_FLAG_FLASH_INPUT_VOLTAGE_LOW	(1 << 6)
> +#define SY7802_FLAG_INPUT_VOLTAGE_LOW		(1 << 7)

Why not BIT()?

> +#define SY7802_CHIP_ID	0x51
> +
> +static const struct reg_default sy7802_regmap_defs[] = {
> +	{ SY7802_REG_ENABLE, SY7802_LEDS_MASK_ALL },
> +	{ SY7802_REG_TORCH_BRIGHTNESS, 0x92 },
> +	{ SY7802_REG_FLASH_BRIGHTNESS, SY7802_FLASH_BRIGHTNESS_DEFAULT |
> +		SY7802_FLASH_BRIGHTNESS_DEFAULT << SY7802_FLASH_CURRENT_SHIFT },
> +	{ SY7802_REG_FLASH_DURATION, 0x6f },
> +	{ SY7802_REG_FLAGS, 0x0 },
> +	{ SY7802_REG_CONFIG_1, 0x68 },
> +	{ SY7802_REG_CONFIG_2, 0xf0 },
> +};
> +
> +struct sy7802_led {
> +	struct led_classdev_flash flash;
> +	struct sy7802 *chip;
> +	u8 led_no;

Is this LED number or no LED?

How about led_num or led_id?

> +};
> +
> +struct sy7802 {
> +	struct mutex mutex;

Place the big stuff (like struct device and regmap at the top).

> +	struct device *dev;
> +	struct regmap *regmap;
> +
> +	struct gpio_desc *enable_gpio;
> +	struct regulator *vin_regulator;
> +
> +	unsigned int fled_strobe_used;
> +	unsigned int fled_torch_used;
> +	unsigned int leds_active;
> +	int num_leds;
> +	struct sy7802_led leds[] __counted_by(num_leds);
> +};
> +
> +static int sy7802_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)

s/level/brightness/

> +{
> +	struct sy7802_led *led = container_of(lcdev, struct sy7802_led, flash.led_cdev);
> +	u32 led_enable_mask = led->led_no == SY7802_LED_JOINT ? SY7802_LEDS_MASK_ALL :
> +			      SY7802_LEDS_MASK(led->led_no);

Do all of the fancy multi-line assignment outside of the declaration block.

> +	u32 enable_mask = SY7802_MODE_MASK | led_enable_mask;
> +	u32 val = level ? led_enable_mask : SY7802_MODE_OFF;
> +	struct sy7802 *chip = led->chip;
> +	u32 curr;

This is a temporary placeholder for fled_torch_used, right?

fled_torch_used_tmp?  Sometimes abbreviated to tmp.

> +	u32 mask;

That's a lot of masks.  Which one is this?

> +	int ret;
> +
> +	mutex_lock(&chip->mutex);
> +
> +	/*
> +	 * There is only one set of flash control logic, and this flag is used to check if 'strobe'

The ',' before 'and' is superfluous.

> +	 * is currently being used.
> +	 */

Doesn't the variable name kind of imply this?

> +	if (chip->fled_strobe_used) {
> +		dev_warn(chip->dev, "Please disable strobe first [%d]\n", chip->fled_strobe_used);

"Cannot set torch brightness whilst strobe is enabled"

> +		ret = -EBUSY;
> +		goto unlock;
> +	}
> +
> +	if (level)
> +		curr = chip->fled_torch_used | BIT(led->led_no);
> +	else
> +		curr = chip->fled_torch_used & ~BIT(led->led_no);
> +
> +	if (curr)
> +		val |= SY7802_MODE_TORCH;
> +
> +	/* Torch needs to be disabled first to apply new brightness */

"Disable touch to apply brightness"

> +	ret = regmap_update_bits(chip->regmap, SY7802_REG_ENABLE, SY7802_MODE_MASK,
> +				 SY7802_MODE_OFF);
> +	if (ret)
> +		goto unlock;
> +
> +	mask = led->led_no == SY7802_LED_JOINT ? SY7802_TORCH_CURRENT_MASK_ALL :

Why not just use led->led_no in place of mask?

Easier to read if you drop SY7802_TORCH_CURRENT_MASK_ALL to its own line.

> +	       SY7802_TORCH_CURRENT_MASK(led->led_no);
> +
> +	/* Register expects brightness between 0 and MAX_BRIGHTNESS - 1 */
> +	if (level)
> +		level -= 1;
> +
> +	level |= (level << SY7802_TORCH_CURRENT_SHIFT);
> +
> +	ret = regmap_update_bits(chip->regmap, SY7802_REG_TORCH_BRIGHTNESS, mask, level);
> +	if (ret)
> +		goto unlock;
> +
> +	ret = regmap_update_bits(chip->regmap, SY7802_REG_ENABLE, enable_mask, val);
> +	if (ret)
> +		goto unlock;
> +
> +	chip->fled_torch_used = curr;
> +
> +unlock:
> +	mutex_unlock(&chip->mutex);
> +	return ret;
> +}
> +
> +static int sy7802_flash_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> +{
> +	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);
> +	struct led_flash_setting *s = &fl_cdev->brightness;
> +	u32 val = (brightness - s->min) / s->step;
> +	struct sy7802 *chip = led->chip;
> +	u32 mask;
> +	int ret;
> +
> +	val |= (val << SY7802_FLASH_CURRENT_SHIFT);
> +	mask = led->led_no == SY7802_LED_JOINT ? SY7802_FLASH_CURRENT_MASK_ALL :
> +	       SY7802_FLASH_CURRENT_MASK(led->led_no);
> +
> +	mutex_lock(&chip->mutex);
> +	ret = regmap_update_bits(chip->regmap, SY7802_REG_FLASH_BRIGHTNESS, mask, val);
> +	mutex_unlock(&chip->mutex);
> +
> +	return ret;
> +}
> +
> +static int sy7802_strobe_set(struct led_classdev_flash *fl_cdev, bool state)

Same comments as above apply throughout the driver.

> +{
> +	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);
> +	u32 led_enable_mask = led->led_no == SY7802_LED_JOINT ? SY7802_LEDS_MASK_ALL :
> +			      SY7802_LEDS_MASK(led->led_no);
> +	u32 enable_mask = SY7802_MODE_MASK | led_enable_mask;
> +	u32 val = state ? led_enable_mask : SY7802_MODE_OFF;
> +	struct sy7802 *chip = led->chip;
> +	u32 curr;
> +	int ret;
> +
> +	mutex_lock(&chip->mutex);
> +
> +	/*
> +	 * There is only one set of flash control logic, and this flag is used to check if 'torch'
> +	 * is currently being used.
> +	 */
> +	if (chip->fled_torch_used) {
> +		dev_warn(chip->dev, "Please disable torch first [0x%x]\n", chip->fled_torch_used);
> +		ret = -EBUSY;
> +		goto unlock;
> +	}
> +
> +	if (state)
> +		curr = chip->fled_strobe_used | BIT(led->led_no);
> +	else
> +		curr = chip->fled_strobe_used & ~BIT(led->led_no);
> +
> +	if (curr)
> +		val |= SY7802_MODE_FLASH;
> +
> +	ret = regmap_update_bits(chip->regmap, SY7802_REG_ENABLE, enable_mask, val);
> +
> +	if (ret)
> +		goto unlock;
> +
> +	chip->fled_strobe_used = curr;
> +
> +unlock:
> +	mutex_unlock(&chip->mutex);
> +	return ret;
> +}
> +
> +static int sy7802_strobe_get(struct led_classdev_flash *fl_cdev, bool *state)
> +{
> +	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);
> +	struct sy7802 *chip = led->chip;
> +
> +	mutex_lock(&chip->mutex);
> +	*state = !!(chip->fled_strobe_used & BIT(led->led_no));
> +	mutex_unlock(&chip->mutex);
> +
> +	return 0;
> +}
> +
> +static int sy7802_timeout_set(struct led_classdev_flash *fl_cdev,
> +			      u32 timeout)
> +{
> +	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);
> +	struct led_flash_setting *s = &fl_cdev->timeout;
> +	u32 val = (timeout - s->min) / s->step;
> +	struct sy7802 *chip = led->chip;
> +
> +	return regmap_write(chip->regmap, SY7802_REG_FLASH_DURATION, val);
> +}
> +
> +static int sy7802_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
> +{
> +	struct sy7802_led *led = container_of(fl_cdev, struct sy7802_led, flash);
> +	struct sy7802 *chip = led->chip;
> +	u32 val, led_faults = 0;
> +	int ret;
> +
> +	/* NOTE: reading register clears fault status */
> +	ret = regmap_read(chip->regmap, SY7802_REG_FLAGS, &val);
> +	if (ret)
> +		return ret;
> +
> +	if (val & (SY7802_FLAG_FLASH_INPUT_VOLTAGE_LOW | SY7802_FLAG_INPUT_VOLTAGE_LOW))
> +		led_faults |= LED_FAULT_INPUT_VOLTAGE;
> +
> +	if (val & SY7802_FLAG_THERMAL_SHUTDOWN)
> +		led_faults |= LED_FAULT_OVER_TEMPERATURE;
> +
> +	if (val & SY7802_FLAG_TIMEOUT)
> +		led_faults |= LED_FAULT_TIMEOUT;
> +
> +	*fault = led_faults;
> +	return 0;
> +}
> +
> +static const struct led_flash_ops sy7802_flash_ops = {
> +	.flash_brightness_set = sy7802_flash_brightness_set,
> +	.strobe_set = sy7802_strobe_set,
> +	.strobe_get = sy7802_strobe_get,
> +	.timeout_set = sy7802_timeout_set,
> +	.fault_get = sy7802_fault_get,
> +};
> +
> +static void sy7802_init_flash_brightness(struct led_classdev_flash *fl_cdev)
> +{
> +	struct led_flash_setting *s;
> +
> +	/* Init flash brightness setting */
> +	s = &fl_cdev->brightness;
> +	s->min = SY7802_FLASH_BRIGHTNESS_MIN;
> +	s->max = SY7802_FLASH_BRIGHTNESS_MAX;
> +	s->step = SY7802_FLASH_BRIGHTNESS_STEP;
> +	s->val = SY7802_FLASH_BRIGHTNESS_DEFAULT;
> +}
> +
> +static void sy7802_init_flash_timeout(struct led_classdev_flash *fl_cdev)
> +{
> +	struct led_flash_setting *s;
> +
> +	/* Init flash timeout setting */
> +	s = &fl_cdev->timeout;
> +	s->min = SY7802_TIMEOUT_MIN_US;
> +	s->max = SY7802_TIMEOUT_MAX_US;
> +	s->step = SY7802_TIMEOUT_STEPSIZE_US;
> +	s->val = SY7802_TIMEOUT_DEFAULT_US;
> +}
> +
> +static int sy7802_led_register(struct device *dev, struct sy7802_led *led,
> +			       struct device_node *np)
> +{
> +	struct led_init_data init_data = {};
> +	int ret;
> +
> +	init_data.fwnode = of_fwnode_handle(np);
> +
> +	ret = devm_led_classdev_flash_register_ext(dev, &led->flash, &init_data);
> +	if (ret) {
> +		dev_err(dev, "Couldn't register flash %d\n", led->led_no);
> +		return ret;
> +	}
> +
> +	return ret;
> +}
> +
> +static int sy7802_init_flash_properties(struct device *dev, struct sy7802_led *led,
> +					struct device_node *np)
> +{
> +	struct led_classdev_flash *flash = &led->flash;
> +	struct led_classdev *lcdev = &flash->led_cdev;
> +	u32 sources[SY7802_MAX_LEDS];
> +	int i, num, ret;
> +
> +	num = of_property_count_u32_elems(np, "led-sources");
> +	if (num < 1) {
> +		dev_err(dev, "Not specified or wrong number of led-sources\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = of_property_read_u32_array(np, "led-sources", sources, num);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < num; i++) {
> +		if (sources[i] >= SY7802_MAX_LEDS)
> +			return -EINVAL;
> +		if (led->chip->leds_active & BIT(sources[i]))
> +			return -EINVAL;
> +		led->chip->leds_active |= BIT(sources[i]);
> +	}
> +
> +	/* If both channels are specified in 'led-sources', joint flash output mode is used */
> +	led->led_no = num == 2 ? SY7802_LED_JOINT : sources[0];
> +
> +	lcdev->max_brightness = SY7802_TORCH_BRIGHTNESS_MAX;
> +	lcdev->brightness_set_blocking = sy7802_torch_brightness_set;
> +	lcdev->flags |= LED_DEV_CAP_FLASH;
> +
> +	flash->ops = &sy7802_flash_ops;
> +
> +	sy7802_init_flash_brightness(flash);
> +	sy7802_init_flash_timeout(flash);
> +
> +	return 0;
> +}
> +
> +static int sy7802_chip_check(struct sy7802 *chip)
> +{
> +	struct device *dev = chip->dev;
> +	u32 chipid;
> +	int ret;
> +
> +	ret = regmap_read(chip->regmap, SY7802_REG_DEV_ID, &chipid);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to read chip ID\n");
> +
> +	if (chipid != SY7802_CHIP_ID)
> +		return dev_err_probe(dev, -ENODEV, "Chip reported wrong ID: %x\n", chipid);

"Unsupported chip detected"

> +
> +	return 0;
> +}
> +
> +static void sy7802_enable(struct sy7802 *chip)
> +{
> +	gpiod_set_value_cansleep(chip->enable_gpio, 1);
> +	usleep_range(200, 300);
> +}
> +
> +static void sy7802_disable(struct sy7802 *chip)
> +{
> +	gpiod_set_value_cansleep(chip->enable_gpio, 0);
> +}
> +
> +static int sy7802_probe_dt(struct sy7802 *chip)
> +{
> +	struct device_node *np = dev_of_node(chip->dev), *child;

This is ugly.  Place 'child' on a separate line.

> +	int i = 0;

If you're going to use a variable like this, rename it.

'count' or 'child_num' perhaps.

And reset/assign it just before you're going to use it for clarity.

> +	int ret;
> +
> +	regmap_write(chip->regmap, SY7802_REG_ENABLE, SY7802_MODE_OFF);
> +	regmap_write(chip->regmap, SY7802_REG_TORCH_BRIGHTNESS, LED_OFF);
> +

        child_num = 0;
> +	for_each_available_child_of_node(np, child) {
> +		struct sy7802_led *led = chip->leds + i;
> +
> +		led->chip = chip;
> +		led->led_no = i;
> +
> +		ret = sy7802_init_flash_properties(chip->dev, led, child);
> +		if (ret) {
> +			of_node_put(child);
> +			return ret;
> +		}
> +
> +		ret = sy7802_led_register(chip->dev, led, child);
> +		if (ret) {
> +			of_node_put(child);
> +			return ret;
> +		}
> +
> +		i++;
> +	}
> +	return 0;
> +}
> +
> +static const struct regmap_config sy7802_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0xff,
> +	.cache_type = REGCACHE_MAPLE,
> +	.reg_defaults = sy7802_regmap_defs,
> +	.num_reg_defaults = ARRAY_SIZE(sy7802_regmap_defs),
> +};
> +
> +static int sy7802_probe(struct i2c_client *client)
> +{
> +	struct device *dev = &client->dev;
> +	struct sy7802 *chip;
> +	size_t count;
> +	int ret;
> +
> +	count = device_get_child_node_count(dev);
> +	if (!count || count > SY7802_MAX_LEDS)
> +		return dev_err_probe(dev, -EINVAL,
> +		       "No child node or node count over max led number %zu\n", count);

Split them up and report on them individually or combine the error message:

"Invalid amount of LED nodes"

> +	chip = devm_kzalloc(dev, struct_size(chip, leds, count), GFP_KERNEL);
> +	if (!chip)
> +		return -ENOMEM;
> +
> +	chip->num_leds = count;
> +
> +	chip->dev = dev;
> +	i2c_set_clientdata(client, chip);
> +
> +	chip->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
> +	ret = PTR_ERR_OR_ZERO(chip->enable_gpio);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to request enable gpio\n");
> +
> +	chip->vin_regulator = devm_regulator_get(dev, "vin");
> +	ret = PTR_ERR_OR_ZERO(chip->vin_regulator);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to request regulator\n");
> +
> +	ret = regulator_enable(chip->vin_regulator);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to enable regulator\n");
> +
> +	chip->regmap = devm_regmap_init_i2c(client, &sy7802_regmap_config);
> +	if (IS_ERR(chip->regmap)) {
> +		regulator_disable(chip->vin_regulator);

Nicer to use gotos for the error path.

3 calls to regulator_disable() is avoidable.

> +		return dev_err_probe(dev, PTR_ERR(chip->regmap),
> +				    "Failed to allocate register map.\n");
> +	}
> +
> +	ret = sy7802_probe_dt(chip);
> +	if (ret < 0) {
> +		regulator_disable(chip->vin_regulator);
> +		return ret;
> +	}
> +
> +	sy7802_enable(chip);
> +
> +	ret = sy7802_chip_check(chip);
> +	if (ret) {
> +		sy7802_disable(chip);
> +		regulator_disable(chip->vin_regulator);
> +		return ret;
> +	}
> +
> +	mutex_init(&chip->mutex);
> +
> +	return ret;
> +}
> +
> +static void sy7802_remove(struct i2c_client *client)
> +{
> +	struct sy7802 *chip = i2c_get_clientdata(client);
> +
> +	sy7802_disable(chip);
> +
> +	mutex_destroy(&chip->mutex);
> +	regulator_disable(chip->vin_regulator);
> +}
> +
> +static const struct of_device_id __maybe_unused sy7802_leds_match[] = {
> +	{ .compatible = "silergy,sy7802", },
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(of, sy7802_leds_match);
> +
> +static struct i2c_driver sy7802_driver = {
> +	.driver = {
> +		.name = "sy7802",
> +		.of_match_table = of_match_ptr(sy7802_leds_match),
> +	},
> +	.probe = sy7802_probe,
> +	.remove = sy7802_remove,
> +};
> +
> +module_i2c_driver(sy7802_driver);
> +
> +MODULE_AUTHOR("André Apitzsch <git@apitzsch.eu>");
> +MODULE_DESCRIPTION("Silergy SY7802 flash LED driver");
> +MODULE_LICENSE("GPL");
> 
> -- 
> 2.44.0
> 
> 

-- 
Lee Jones [李琼斯]