drivers/gpu/drm/amd/display/dc/gpio/hw_generic.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/gpio/hw_generic.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/gpio/hw_generic.c
Extension
.c
Size
3302 bytes
Lines
130
Domain
Driver Families
Bucket
drivers/gpu
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

#include <linux/slab.h>

#include "dm_services.h"

#include "include/gpio_interface.h"
#include "include/gpio_types.h"
#include "hw_gpio.h"
#include "hw_generic.h"

#include "reg_helper.h"
#include "generic_regs.h"

#undef FN
#define FN(reg_name, field_name) \
	gpio_reg_shift(generic->shifts->field_name), generic->masks->field_name

#define CTX \
	generic->base.base.ctx
#define REG(reg)\
	(generic->regs->reg)

struct gpio;

static void dal_hw_generic_destruct(
	struct hw_generic *pin)
{
	dal_hw_gpio_destruct(&pin->base);
}

static void dal_hw_generic_destroy(
	struct hw_gpio_pin **ptr)
{
	struct hw_generic *generic = HW_GENERIC_FROM_BASE(*ptr);

	dal_hw_generic_destruct(generic);

	kfree(generic);

	*ptr = NULL;
}

static enum gpio_result set_config(
	struct hw_gpio_pin *ptr,
	const struct gpio_config_data *config_data)
{
	struct hw_generic *generic = HW_GENERIC_FROM_BASE(ptr);

	if (!config_data)
		return GPIO_RESULT_INVALID_DATA;

	REG_UPDATE_2(mux,
		GENERIC_EN, config_data->config.generic_mux.enable_output_from_mux,
		GENERIC_SEL, config_data->config.generic_mux.mux_select);

	return GPIO_RESULT_OK;
}

static const struct hw_gpio_pin_funcs funcs = {
	.destroy = dal_hw_generic_destroy,
	.open = dal_hw_gpio_open,
	.get_value = dal_hw_gpio_get_value,
	.set_value = dal_hw_gpio_set_value,
	.set_config = set_config,
	.change_mode = dal_hw_gpio_change_mode,
	.close = dal_hw_gpio_close,
};

static void dal_hw_generic_construct(
	struct hw_generic *pin,
	enum gpio_id id,
	uint32_t en,
	struct dc_context *ctx)
{
	dal_hw_gpio_construct(&pin->base, id, en, ctx);
	pin->base.base.funcs = &funcs;
}

void dal_hw_generic_init(
	struct hw_generic **hw_generic,
	struct dc_context *ctx,
	enum gpio_id id,
	uint32_t en)
{
	if (en > GPIO_DDC_LINE_MAX) {
		ASSERT_CRITICAL(false);
		*hw_generic = NULL;
	}

	*hw_generic = kzalloc_obj(struct hw_generic);
	if (!*hw_generic) {

Annotation

Implementation Notes