drivers/gpio/gpio-74xx-mmio.c

Source file repositories/reference/linux-study-clean/drivers/gpio/gpio-74xx-mmio.c

File Facts

System
Linux kernel
Corpus path
drivers/gpio/gpio-74xx-mmio.c
Extension
.c
Size
3712 bytes
Lines
155
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 mmio_74xx_gpio_priv {
	struct gpio_generic_chip gen_gc;
	unsigned int flags;
};

static const struct of_device_id mmio_74xx_gpio_ids[] = {
	{
		.compatible	= "ti,741g125",
		.data		= (const void *)(MMIO_74XX_DIR_IN | 1),
	},
	{
		.compatible	= "ti,742g125",
		.data		= (const void *)(MMIO_74XX_DIR_IN | 2),
	},
	{
		.compatible	= "ti,74125",
		.data		= (const void *)(MMIO_74XX_DIR_IN | 4),
	},
	{
		.compatible	= "ti,74365",
		.data		= (const void *)(MMIO_74XX_DIR_IN | 6),
	},
	{
		.compatible	= "ti,74244",
		.data		= (const void *)(MMIO_74XX_DIR_IN | 8),
	},
	{
		.compatible	= "ti,741624",
		.data		= (const void *)(MMIO_74XX_DIR_IN | 16),
	},
	{
		.compatible	= "ti,741g74",
		.data		= (const void *)(MMIO_74XX_DIR_OUT | 1),
	},
	{
		.compatible	= "ti,7474",
		.data		= (const void *)(MMIO_74XX_DIR_OUT | 2),
	},
	{
		.compatible	= "ti,74175",
		.data		= (const void *)(MMIO_74XX_DIR_OUT | 4),
	},
	{
		.compatible	= "ti,74174",
		.data		= (const void *)(MMIO_74XX_DIR_OUT | 6),
	},
	{
		.compatible	= "ti,74273",
		.data		= (const void *)(MMIO_74XX_DIR_OUT | 8),
	},
	{
		.compatible	= "ti,7416374",
		.data		= (const void *)(MMIO_74XX_DIR_OUT | 16),
	},
	{ }
};
MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);

static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
{
	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);

	if (priv->flags & MMIO_74XX_DIR_OUT)
		return GPIO_LINE_DIRECTION_OUT;

	return  GPIO_LINE_DIRECTION_IN;
}

static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);

	if (priv->flags & MMIO_74XX_DIR_IN)
		return 0;

	return -ENOTSUPP;
}

static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
	struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);

	if (priv->flags & MMIO_74XX_DIR_OUT)
		return gpio_generic_chip_set(&priv->gen_gc, gpio, val);

	return -ENOTSUPP;
}

static int mmio_74xx_gpio_probe(struct platform_device *pdev)
{

Annotation

Implementation Notes