drivers/pinctrl/vt8500/pinctrl-wmt.c

Source file repositories/reference/linux-study-clean/drivers/pinctrl/vt8500/pinctrl-wmt.c

File Facts

System
Linux kernel
Corpus path
drivers/pinctrl/vt8500/pinctrl-wmt.c
Extension
.c
Size
14831 bytes
Lines
600
Domain
Driver Families
Bucket
drivers/pinctrl
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

if (reg_en == NO_REG) {
			dev_err(data->dev, "pin:%d no alt function available\n",
				pin);
			return -EINVAL;
		}
		wmt_clearbits(data, reg_en, BIT(bit));
	}

	return 0;
}

static int wmt_pmx_set_mux(struct pinctrl_dev *pctldev,
			   unsigned func_selector,
			   unsigned group_selector)
{
	struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
	u32 pinnum = data->pins[group_selector].number;

	return wmt_set_pinmux(data, func_selector, pinnum);
}

static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
				      struct pinctrl_gpio_range *range,
				      unsigned offset)
{
	struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);

	/* disable by setting GPIO_IN */
	wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset);
}

static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
				      struct pinctrl_gpio_range *range,
				      unsigned offset,
				      bool input)
{
	struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);

	wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT),
		       offset);

	return 0;
}

static const struct pinmux_ops wmt_pinmux_ops = {
	.get_functions_count = wmt_pmx_get_functions_count,
	.get_function_name = wmt_pmx_get_function_name,
	.get_function_groups = wmt_pmx_get_function_groups,
	.set_mux = wmt_pmx_set_mux,
	.gpio_disable_free = wmt_pmx_gpio_disable_free,
	.gpio_set_direction = wmt_pmx_gpio_set_direction,
};

static int wmt_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);

	return data->ngroups;
}

static const char *wmt_get_group_name(struct pinctrl_dev *pctldev,
				      unsigned selector)
{
	struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);

	return data->groups[selector];
}

static int wmt_get_group_pins(struct pinctrl_dev *pctldev,
			      unsigned selector,
			      const unsigned **pins,
			      unsigned *num_pins)
{
	struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);

	*pins = &data->pins[selector].number;
	*num_pins = 1;

	return 0;
}

static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin)
{
	int i;

	for (i = 0; i < data->npins; i++) {
		if (data->pins[i].number == pin)
			return i;
	}

Annotation

Implementation Notes