drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/mxm/mxms.c
Extension
.c
Size
4759 bytes
Lines
192
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

switch (type) {
		case 0: /* Output Device Structure */
			if (mxms_version(mxm) >= 0x0300)
				headerlen = 8;
			else
				headerlen = 6;
			break;
		case 1: /* System Cooling Capability Structure */
		case 2: /* Thermal Structure */
		case 3: /* Input Power Structure */
			headerlen = 4;
			break;
		case 4: /* GPIO Device Structure */
			headerlen = 4;
			recordlen = 2;
			entries   = (ROM32(desc[0]) & 0x01f00000) >> 20;
			break;
		case 5: /* Vendor Specific Structure */
			headerlen = 8;
			break;
		case 6: /* Backlight Control Structure */
			if (mxms_version(mxm) >= 0x0300) {
				headerlen = 4;
				recordlen = 8;
				entries   = (desc[1] & 0xf0) >> 4;
			} else {
				headerlen = 8;
			}
			break;
		case 7: /* Fan Control Structure */
			headerlen = 8;
			recordlen = 4;
			entries   = desc[1] & 0x07;
			break;
		default:
			nvkm_debug(subdev, "unknown descriptor type %d\n", type);
			return false;
		}

		if (mxm->subdev.debug >= NV_DBG_DEBUG && (exec == NULL)) {
			static const char * mxms_desc[] = {
				"ODS", "SCCS", "TS", "IPS",
				"GSD", "VSS", "BCS", "FCS",
			};
			u8 *dump = desc;
			char data[32], *ptr;
			int i, j;

			for (j = headerlen - 1, ptr = data; j >= 0; j--)
				ptr += sprintf(ptr, "%02x", dump[j]);
			dump += headerlen;

			nvkm_debug(subdev, "%4s: %s\n", mxms_desc[type], data);
			for (i = 0; i < entries; i++, dump += recordlen) {
				for (j = recordlen - 1, ptr = data; j >= 0; j--)
					ptr += sprintf(ptr, "%02x", dump[j]);
				nvkm_debug(subdev, "      %s\n", data);
			}
		}

		if (types & (1 << type)) {
			if (!exec(mxm, desc, info))
				return false;
		}

		desc += headerlen + (entries * recordlen);
	}

	return true;
}

void
mxms_output_device(struct nvkm_mxm *mxm, u8 *pdata, struct mxms_odev *desc)
{
	u64 data = ROM32(pdata[0]);
	if (mxms_version(mxm) >= 0x0300)
		data |= (u64)ROM16(pdata[4]) << 32;

	desc->outp_type = (data & 0x00000000000000f0ULL) >> 4;
	desc->ddc_port  = (data & 0x0000000000000f00ULL) >> 8;
	desc->conn_type = (data & 0x000000000001f000ULL) >> 12;
	desc->dig_conn  = (data & 0x0000000000780000ULL) >> 19;
}

Annotation

Implementation Notes