drivers/gpio/gpio-tps65912.c

Source file repositories/reference/linux-study-clean/drivers/gpio/gpio-tps65912.c

File Facts

System
Linux kernel
Corpus path
drivers/gpio/gpio-tps65912.c
Extension
.c
Size
3431 bytes
Lines
135
Domain
Driver Families
Bucket
drivers/gpio
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct tps65912_gpio {
	struct gpio_chip gpio_chip;
	struct tps65912 *tps;
};

static int tps65912_gpio_get_direction(struct gpio_chip *gc,
				       unsigned offset)
{
	struct tps65912_gpio *gpio = gpiochip_get_data(gc);

	int ret, val;

	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
	if (ret)
		return ret;

	if (val & GPIO_CFG_MASK)
		return GPIO_LINE_DIRECTION_OUT;
	else
		return GPIO_LINE_DIRECTION_IN;
}

static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
{
	struct tps65912_gpio *gpio = gpiochip_get_data(gc);

	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
				  GPIO_CFG_MASK, 0);
}

static int tps65912_gpio_direction_output(struct gpio_chip *gc,
					  unsigned offset, int value)
{
	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
	int ret;

	/* Set the initial value */
	ret = regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
				 GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
	if (ret)
		return ret;

	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
				  GPIO_CFG_MASK, GPIO_CFG_MASK);
}

static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
	int ret, val;

	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
	if (ret)
		return ret;

	if (val & GPIO_STS_MASK)
		return 1;

	return 0;
}

static int tps65912_gpio_set(struct gpio_chip *gc, unsigned int offset,
			     int value)
{
	struct tps65912_gpio *gpio = gpiochip_get_data(gc);

	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
				  GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
}

static const struct gpio_chip template_chip = {
	.label			= "tps65912-gpio",
	.owner			= THIS_MODULE,
	.get_direction		= tps65912_gpio_get_direction,
	.direction_input	= tps65912_gpio_direction_input,
	.direction_output	= tps65912_gpio_direction_output,
	.get			= tps65912_gpio_get,
	.set			= tps65912_gpio_set,
	.base			= -1,
	.ngpio			= 5,
	.can_sleep		= true,
};

static int tps65912_gpio_probe(struct platform_device *pdev)
{
	struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
	struct tps65912_gpio *gpio;

	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
	if (!gpio)

Annotation

Implementation Notes