drivers/gpio/gpio-tps65086.c

Source file repositories/reference/linux-study-clean/drivers/gpio/gpio-tps65086.c

File Facts

System
Linux kernel
Corpus path
drivers/gpio/gpio-tps65086.c
Extension
.c
Size
2788 bytes
Lines
111
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 tps65086_gpio {
	struct gpio_chip chip;
	struct tps65086 *tps;
};

static int tps65086_gpio_get_direction(struct gpio_chip *chip,
				       unsigned offset)
{
	/* This device is output only */
	return GPIO_LINE_DIRECTION_OUT;
}

static int tps65086_gpio_direction_input(struct gpio_chip *chip,
					 unsigned offset)
{
	/* This device is output only */
	return -EINVAL;
}

static int tps65086_gpio_direction_output(struct gpio_chip *chip,
					  unsigned offset, int value)
{
	struct tps65086_gpio *gpio = gpiochip_get_data(chip);

	/* Set the initial value */
	return regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
				  BIT(4 + offset), value ? BIT(4 + offset) : 0);
}

static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
	if (ret < 0)
		return ret;

	return !!(val & BIT(4 + offset));
}

static int tps65086_gpio_set(struct gpio_chip *chip, unsigned int offset,
			     int value)
{
	struct tps65086_gpio *gpio = gpiochip_get_data(chip);

	return regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
				  BIT(4 + offset), value ? BIT(4 + offset) : 0);
}

static const struct gpio_chip template_chip = {
	.label			= "tps65086-gpio",
	.owner			= THIS_MODULE,
	.get_direction		= tps65086_gpio_get_direction,
	.direction_input	= tps65086_gpio_direction_input,
	.direction_output	= tps65086_gpio_direction_output,
	.get			= tps65086_gpio_get,
	.set			= tps65086_gpio_set,
	.base			= -1,
	.ngpio			= 4,
	.can_sleep		= true,
};

static int tps65086_gpio_probe(struct platform_device *pdev)
{
	struct tps65086_gpio *gpio;

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

	gpio->tps = dev_get_drvdata(pdev->dev.parent);
	gpio->chip = template_chip;
	gpio->chip.parent = gpio->tps->dev;

	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
}

static const struct platform_device_id tps65086_gpio_id_table[] = {
	{ .name = "tps65086-gpio" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);

static struct platform_driver tps65086_gpio_driver = {
	.driver = {
		.name = "tps65086-gpio",
	},
	.probe = tps65086_gpio_probe,
	.id_table = tps65086_gpio_id_table,

Annotation

Implementation Notes