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

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c
Extension
.c
Size
13371 bytes
Lines
679
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

if (number_of_bits)  {
				service->busyness[index_of_id] =
					kcalloc(number_of_bits, sizeof(char),
						GFP_KERNEL);

				if (!service->busyness[index_of_id]) {
					BREAK_TO_DEBUGGER();
					goto failure_2;
				}

				do {
					service->busyness[index_of_id][i] = 0;
					++i;
				} while (i < number_of_bits);
			} else {
				service->busyness[index_of_id] = NULL;
			}

			++index_of_id;
		} while (index_of_id < GPIO_ID_COUNT);
	}

	return service;

failure_2:
	while (index_of_id > 0) {
		--index_of_id;
		kfree(service->busyness[index_of_id]);
	}

failure_1:
	kfree(service);

	return NULL;
}

struct gpio *dal_gpio_service_create_irq(
	struct gpio_service *service,
	uint32_t offset,
	uint32_t mask)
{
	enum gpio_id id = 0;
	uint32_t en;

	if (!service->translate.funcs->offset_to_id(offset, mask, &id, &en)) {
		ASSERT_CRITICAL(false);
		return NULL;
	}

	return dal_gpio_create_irq(service, id, en);
}

struct gpio *dal_gpio_service_create_generic_mux(
	struct gpio_service *service,
	uint32_t offset,
	uint32_t mask)
{
	enum gpio_id id = 0;
	uint32_t en;
	struct gpio *generic;

	if (!service->translate.funcs->offset_to_id(offset, mask, &id, &en)) {
		ASSERT_CRITICAL(false);
		return NULL;
	}

	generic = dal_gpio_create(
		service, id, en, GPIO_PIN_OUTPUT_STATE_DEFAULT);

	return generic;
}

void dal_gpio_destroy_generic_mux(
	struct gpio **mux)
{
	if (!mux || !*mux) {
		ASSERT_CRITICAL(false);
		return;
	}

	dal_gpio_destroy(mux);
	kfree(*mux);

	*mux = NULL;
}

struct gpio_pin_info dal_gpio_get_generic_pin_info(
	struct gpio_service *service,
	enum gpio_id id,
	uint32_t en)

Annotation

Implementation Notes