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backend/drm: fetch EDID manufacturer from udev_hwdb

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Maintaining our internal table up-to-date is tedious: one needs to
manually go through the PnP ID registry [1] and check whether we're
missing any entry.

udev_hwdb already has an API to fetch a manufacturer name from its
PnP ID. Use that instead.

[1]: https://uefi.org/pnp_id_list
Simon Ser 3 years ago committed by Simon Zeni
parent fa9b61004b
commit e646d882cf
5 changed files with 67 additions and 81 deletions
Show Stats Download Patch File Download Diff File

26
backend/drm/backend.c
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@ -1,6 +1,7 @@
#include <assert.h>
#include <errno.h>
#include <drm_fourcc.h>
#include <libudev.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -58,6 +59,7 @@ static void backend_destroy(struct wlr_backend *backend) {
finish_drm_resources(drm);
udev_hwdb_unref(drm->hwdb);
free(drm->name);
wlr_session_close_file(drm->session, drm->dev);
wl_event_source_remove(drm->drm_event);
@ -172,6 +174,23 @@ static void handle_parent_destroy(struct wl_listener *listener, void *data) {
backend_destroy(&drm->backend);
}
static struct udev_hwdb *create_udev_hwdb(void) {
struct udev *udev = udev_new();
if (!udev) {
wlr_log(WLR_ERROR, "udev_new failed");
return NULL;
}
struct udev_hwdb *hwdb = udev_hwdb_new(udev);
udev_unref(udev);
if (!hwdb) {
wlr_log(WLR_ERROR, "udev_hwdb_new failed");
return NULL;
}
return hwdb;
}
struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
struct wlr_session *session, struct wlr_device *dev,
struct wlr_backend *parent) {
@ -226,6 +245,12 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
drm->session_active.notify = handle_session_active;
wl_signal_add(&session->events.active, &drm->session_active);
drm->hwdb = create_udev_hwdb();
if (!drm->hwdb) {
wlr_log(WLR_INFO, "Failed to load udev_hwdb, "
"falling back to PnP IDs instead of manufacturer names");
}
if (!check_drm_features(drm)) {
goto error_event;
}
@ -275,6 +300,7 @@ error_mgpu_renderer:
error_resources:
finish_drm_resources(drm);
error_event:
udev_hwdb_unref(drm->hwdb);
wl_list_remove(&drm->session_active.link);
wl_event_source_remove(drm->drm_event);
error_fd:

2
backend/drm/drm.c
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@ -1314,7 +1314,7 @@ void scan_drm_connectors(struct wlr_drm_backend *drm,
size_t edid_len = 0;
uint8_t *edid = get_drm_prop_blob(drm->fd,
wlr_conn->id, wlr_conn->props.edid, &edid_len);
parse_edid(&wlr_conn->output, edid_len, edid);
parse_edid(wlr_conn, edid_len, edid);
free(edid);
char *subconnector = NULL;

113
backend/drm/util.c
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@ -2,9 +2,11 @@
#include <drm_fourcc.h>
#include <drm_mode.h>
#include <drm.h>
#include <libudev.h>
#include <stdio.h>
#include <string.h>
#include <wlr/util/log.h>
#include "backend/drm/drm.h"
#include "backend/drm/util.h"
int32_t calculate_refresh_rate(const drmModeModeInfo *mode) {
@ -26,94 +28,51 @@ int32_t calculate_refresh_rate(const drmModeModeInfo *mode) {
return refresh;
}
// Constructed from http://edid.tv/manufacturer
static const char *get_manufacturer(uint16_t id) {
#define ID(a, b, c) ((a & 0x1f) << 10) | ((b & 0x1f) << 5) | (c & 0x1f)
switch (id) {
case ID('A', 'A', 'A'): return "Avolites Ltd";
case ID('A', 'C', 'I'): return "Ancor Communications Inc";
case ID('A', 'C', 'R'): return "Acer Technologies";
case ID('A', 'D', 'A'): return "Addi-Data GmbH";
case ID('A', 'P', 'P'): return "Apple Computer Inc";
case ID('A', 'S', 'K'): return "Ask A/S";
case ID('A', 'V', 'T'): return "Avtek (Electronics) Pty Ltd";
case ID('B', 'N', 'O'): return "Bang & Olufsen";
case ID('B', 'N', 'Q'): return "BenQ Corporation";
case ID('C', 'M', 'N'): return "Chimei Innolux Corporation";
case ID('C', 'M', 'O'): return "Chi Mei Optoelectronics corp.";
case ID('C', 'R', 'O'): return "Extraordinary Technologies PTY Limited";
case ID('D', 'E', 'L'): return "Dell Inc.";
case ID('D', 'G', 'C'): return "Data General Corporation";
case ID('D', 'O', 'N'): return "DENON, Ltd.";
case ID('E', 'N', 'C'): return "Eizo Nanao Corporation";
case ID('E', 'P', 'H'): return "Epiphan Systems Inc.";
case ID('E', 'X', 'P'): return "Data Export Corporation";
case ID('F', 'N', 'I'): return "Funai Electric Co., Ltd.";
case ID('F', 'U', 'S'): return "Fujitsu Siemens Computers GmbH";
case ID('G', 'S', 'M'): return "Goldstar Company Ltd";
case ID('H', 'I', 'Q'): return "Kaohsiung Opto Electronics Americas, Inc.";
case ID('H', 'S', 'D'): return "HannStar Display Corp";
case ID('H', 'T', 'C'): return "Hitachi Ltd";
case ID('H', 'W', 'P'): return "Hewlett Packard";
case ID('I', 'N', 'T'): return "Interphase Corporation";
case ID('I', 'N', 'X'): return "Communications Supply Corporation (A division of WESCO)";
case ID('I', 'T', 'E'): return "Integrated Tech Express Inc";
case ID('I', 'V', 'M'): return "Iiyama North America";
case ID('L', 'E', 'N'): return "Lenovo Group Limited";
case ID('M', 'A', 'X'): return "Rogen Tech Distribution Inc";
case ID('M', 'E', 'G'): return "Abeam Tech Ltd";
case ID('M', 'E', 'I'): return "Panasonic Industry Company";
case ID('M', 'T', 'C'): return "Mars-Tech Corporation";
case ID('M', 'T', 'X'): return "Matrox";
case ID('N', 'E', 'C'): return "NEC Corporation";
case ID('N', 'E', 'X'): return "Nexgen Mediatech Inc.";
case ID('O', 'N', 'K'): return "ONKYO Corporation";
case ID('O', 'R', 'N'): return "ORION ELECTRIC CO., LTD.";
case ID('O', 'T', 'M'): return "Optoma Corporation";
case ID('O', 'V', 'R'): return "Oculus VR, Inc.";
case ID('P', 'H', 'L'): return "Philips Consumer Electronics Company";
case ID('P', 'I', 'O'): return "Pioneer Electronic Corporation";
case ID('P', 'N', 'R'): return "Planar Systems, Inc.";
case ID('Q', 'D', 'S'): return "Quanta Display Inc.";
case ID('R', 'A', 'T'): return "Rent-A-Tech";
case ID('R', 'E', 'N'): return "Renesas Technology Corp.";
case ID('S', 'A', 'M'): return "Samsung Electric Company";
case ID('S', 'A', 'N'): return "Sanyo Electric Co., Ltd.";
case ID('S', 'E', 'C'): return "Seiko Epson Corporation";
case ID('S', 'H', 'P'): return "Sharp Corporation";
case ID('S', 'I', 'I'): return "Silicon Image, Inc.";
case ID('S', 'N', 'Y'): return "Sony";
case ID('S', 'T', 'D'): return "STD Computer Inc";
case ID('S', 'V', 'S'): return "SVSI";
case ID('S', 'Y', 'N'): return "Synaptics Inc";
case ID('T', 'C', 'L'): return "Technical Concepts Ltd";
case ID('T', 'O', 'P'): return "Orion Communications Co., Ltd.";
case ID('T', 'S', 'B'): return "Toshiba America Info Systems Inc";
case ID('T', 'S', 'T'): return "Transtream Inc";
case ID('U', 'N', 'K'): return "Unknown";
case ID('V', 'E', 'S'): return "Vestel Elektronik Sanayi ve Ticaret A. S.";
case ID('V', 'I', 'T'): return "Visitech AS";
case ID('V', 'I', 'Z'): return "VIZIO, Inc";
case ID('V', 'L', 'V'): return "Valve";
case ID('V', 'S', 'C'): return "ViewSonic Corporation";
case ID('Y', 'M', 'H'): return "Yamaha Corporation";
default: return "Unknown";
static const char *get_manufacturer(struct udev_hwdb *hwdb, uint16_t code) {
static char pnp_id[4];
// The ASCII 3-letter manufacturer PnP ID is encoded in 5-bit codes
pnp_id[0] = ((code >> 10) & 0x1F) + '@';
pnp_id[1] = ((code >> 5) & 0x1F) + '@';
pnp_id[2] = ((code >> 0) & 0x1F) + '@';
pnp_id[3] = '\0';
if (hwdb == NULL) {
return pnp_id;
}
char query[32];
snprintf(query, sizeof(query), "acpi:%s:", pnp_id);
struct udev_list_entry *acpi_entry =
udev_hwdb_get_properties_list_entry(hwdb, query, 0);
if (acpi_entry == NULL) {
return pnp_id;
}
#undef ID
struct udev_list_entry *vendor_entry =
udev_list_entry_get_by_name(acpi_entry, "ID_VENDOR_FROM_DATABASE");
if (vendor_entry == NULL) {
return pnp_id;
}
return udev_list_entry_get_value(vendor_entry);
}
/* See https://en.wikipedia.org/wiki/Extended_Display_Identification_Data for layout of EDID data.
* We don't parse the EDID properly. We just expect to receive valid data.
*/
void parse_edid(struct wlr_output *restrict output, size_t len, const uint8_t *data) {
void parse_edid(struct wlr_drm_connector *conn, size_t len, const uint8_t *data) {
struct wlr_output *output = &conn->output;
if (!data || len < 128) {
snprintf(output->make, sizeof(output->make), "<Unknown>");
snprintf(output->model, sizeof(output->model), "<Unknown>");
snprintf(output->make, sizeof(output->make), "Unknown");
snprintf(output->model, sizeof(output->model), "Unknown");
return;
}
uint16_t id = (data[8] << 8) | data[9];
snprintf(output->make, sizeof(output->make), "%s", get_manufacturer(id));
snprintf(output->make, sizeof(output->make), "%s",
get_manufacturer(conn->backend->hwdb, id));
uint16_t model = data[10] | (data[11] << 8);
snprintf(output->model, sizeof(output->model), "0x%04X", model);

1
include/backend/drm/drm.h
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@ -58,6 +58,7 @@ struct wlr_drm_backend {
const struct wlr_drm_interface *iface;
clockid_t clock;
bool addfb2_modifiers;
struct udev_hwdb *hwdb;
int fd;
char *name;

6
include/backend/drm/util.h
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@ -2,15 +2,15 @@
#define BACKEND_DRM_UTIL_H
#include <stdint.h>
#include <wlr/types/wlr_output.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
struct wlr_drm_connector;
// Calculates a more accurate refresh rate (mHz) than what mode itself provides
int32_t calculate_refresh_rate(const drmModeModeInfo *mode);
// Populates the make/model/phys_{width,height} of output from the edid data
void parse_edid(struct wlr_output *restrict output, size_t len,
const uint8_t *data);
void parse_edid(struct wlr_drm_connector *conn, size_t len, const uint8_t *data);
// Returns the string representation of a DRM output type
const char *conn_get_name(uint32_t type_id);

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