drivers/gpu/drm/i915/display/intel_gmbus.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/display/intel_gmbus.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/display/intel_gmbus.c
Extension
.c
Size
27747 bytes
Lines
1035
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

struct intel_gmbus {
	struct i2c_adapter adapter;
#define GMBUS_FORCE_BIT_RETRY (1U << 31)
	u32 force_bit;
	u32 reg0;
	intel_reg_t gpio_reg;
	struct i2c_algo_bit_data bit_algo;
	struct intel_display *display;
};

enum gmbus_gpio {
	GPIOA,
	GPIOB,
	GPIOC,
	GPIOD,
	GPIOE,
	GPIOF,
	GPIOG,
	GPIOH,
	__GPIOI_UNUSED,
	GPIOJ,
	GPIOK,
	GPIOL,
	GPIOM,
	GPION,
	GPIOO,
};

struct gmbus_pin {
	const char *name;
	enum gmbus_gpio gpio;
};

/* Map gmbus pin pairs to names and registers. */
static const struct gmbus_pin gmbus_pins[] = {
	[GMBUS_PIN_SSC] = { "ssc", GPIOB },
	[GMBUS_PIN_VGADDC] = { "vga", GPIOA },
	[GMBUS_PIN_PANEL] = { "panel", GPIOC },
	[GMBUS_PIN_DPC] = { "dpc", GPIOD },
	[GMBUS_PIN_DPB] = { "dpb", GPIOE },
	[GMBUS_PIN_DPD] = { "dpd", GPIOF },
};

static const struct gmbus_pin gmbus_pins_bdw[] = {
	[GMBUS_PIN_VGADDC] = { "vga", GPIOA },
	[GMBUS_PIN_DPC] = { "dpc", GPIOD },
	[GMBUS_PIN_DPB] = { "dpb", GPIOE },
	[GMBUS_PIN_DPD] = { "dpd", GPIOF },
};

static const struct gmbus_pin gmbus_pins_skl[] = {
	[GMBUS_PIN_DPC] = { "dpc", GPIOD },
	[GMBUS_PIN_DPB] = { "dpb", GPIOE },
	[GMBUS_PIN_DPD] = { "dpd", GPIOF },
};

static const struct gmbus_pin gmbus_pins_bxt[] = {
	[GMBUS_PIN_1_BXT] = { "dpb", GPIOB },
	[GMBUS_PIN_2_BXT] = { "dpc", GPIOC },
	[GMBUS_PIN_3_BXT] = { "misc", GPIOD },
};

static const struct gmbus_pin gmbus_pins_cnp[] = {
	[GMBUS_PIN_1_BXT] = { "dpb", GPIOB },
	[GMBUS_PIN_2_BXT] = { "dpc", GPIOC },
	[GMBUS_PIN_3_BXT] = { "misc", GPIOD },
	[GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
};

static const struct gmbus_pin gmbus_pins_icp[] = {
	[GMBUS_PIN_1_BXT] = { "dpa", GPIOB },
	[GMBUS_PIN_2_BXT] = { "dpb", GPIOC },
	[GMBUS_PIN_3_BXT] = { "dpc", GPIOD },
	[GMBUS_PIN_9_TC1_ICP] = { "tc1", GPIOJ },
	[GMBUS_PIN_10_TC2_ICP] = { "tc2", GPIOK },
	[GMBUS_PIN_11_TC3_ICP] = { "tc3", GPIOL },
	[GMBUS_PIN_12_TC4_ICP] = { "tc4", GPIOM },
	[GMBUS_PIN_13_TC5_TGP] = { "tc5", GPION },
	[GMBUS_PIN_14_TC6_TGP] = { "tc6", GPIOO },
};

static const struct gmbus_pin gmbus_pins_dg1[] = {
	[GMBUS_PIN_1_BXT] = { "dpa", GPIOB },
	[GMBUS_PIN_2_BXT] = { "dpb", GPIOC },
	[GMBUS_PIN_3_BXT] = { "dpc", GPIOD },
	[GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
};

static const struct gmbus_pin gmbus_pins_dg2[] = {
	[GMBUS_PIN_1_BXT] = { "dpa", GPIOB },

Annotation

Implementation Notes