drm: parse make/model from EDID
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parent
09a53dc416
commit
5fca0702ab
2 changed files with 109 additions and 4 deletions
110
src/drm.cpp
110
src/drm.cpp
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@ -45,6 +45,8 @@ enum drm_mode_generation g_drmModeGeneration = DRM_MODE_GENERATE_CVT;
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static LogScope drm_log("drm");
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static LogScope drm_verbose_log("drm", LOG_SILENT);
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static std::map< std::string, std::string > pnps = {};
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static std::map< uint32_t, const char * > connector_types = {
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{ DRM_MODE_CONNECTOR_Unknown, "Unknown" },
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{ DRM_MODE_CONNECTOR_VGA, "VGA" },
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@ -325,6 +327,64 @@ static bool compare_modes( drmModeModeInfo mode1, drmModeModeInfo mode2 )
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return mode1.vrefresh > mode2.vrefresh;
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}
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static void parse_edid( drm_t *drm, struct connector *conn)
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{
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free(conn->make);
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conn->make = NULL;
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free(conn->model);
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conn->model = NULL;
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if (conn->props.count("EDID") == 0) {
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return;
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}
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uint64_t blob_id = conn->initial_prop_values["EDID"];
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if (blob_id == 0) {
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return;
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}
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drmModePropertyBlobRes *blob = drmModeGetPropertyBlob(drm->fd, blob_id);
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if (!blob) {
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drm_log.errorf_errno("drmModeGetPropertyBlob(EDID) failed");
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return;
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}
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if (blob->length < 128) {
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drm_log.errorf("Truncated EDID");
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return;
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}
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const uint8_t *data = (const uint8_t *) blob->data;
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// The ASCII 3-letter manufacturer PnP ID is encoded in 5-bit codes
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uint16_t id = (data[8] << 8) | data[9];
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char pnp_id[] = {
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(char)(((id >> 10) & 0x1F) + '@'),
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(char)(((id >> 5) & 0x1F) + '@'),
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(char)(((id >> 0) & 0x1F) + '@'),
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'\0',
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};
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if (pnps.count(pnp_id) > 0) {
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conn->make = strdup(pnps[pnp_id].c_str());
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}
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for (size_t i = 72; i <= 108; i += 18) {
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uint16_t flag = (data[i] << 8) | data[i + 1];
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if (flag == 0 && data[i + 3] == 0xFC) {
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char model[14];
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snprintf(model, sizeof(model), "%.13s", &data[i + 5]);
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char *nl = strchr(model, '\n');
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if (nl) {
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*nl = '\0';
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}
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conn->model = strdup(model);
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}
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}
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drmModeFreePropertyBlob(blob);
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}
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static bool refresh_state( drm_t *drm )
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{
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drmModeRes *resources = drmModeGetResources(drm->fd);
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@ -401,10 +461,11 @@ static bool refresh_state( drm_t *drm )
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char name[128] = {};
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snprintf(name, sizeof(name), "%s-%d", type_str, conn->connector->connector_type_id);
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conn->name = strdup(name);
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conn->possible_crtcs = get_connector_possible_crtcs(drm, conn->connector);
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parse_edid(drm, conn);
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}
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for (size_t i = 0; i < drm->crtcs.size(); i++) {
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@ -593,14 +654,20 @@ static bool setup_best_connector(struct drm_t *drm)
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return false;
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}
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const char *description;
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char description[256];
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switch (best->connector->connector_type) {
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case DRM_MODE_CONNECTOR_LVDS:
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case DRM_MODE_CONNECTOR_eDP:
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description = "Internal screen";
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snprintf(description, sizeof(description), "Internal screen");
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break;
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default:
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description = "External screen";
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if (best->make && best->model) {
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snprintf(description, sizeof(description), "%s %s", best->make, best->model);
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} else if (best->model) {
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snprintf(description, sizeof(description), "%s", best->model);
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} else {
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snprintf(description, sizeof(description), "External screen");
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}
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break;
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}
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@ -657,8 +724,43 @@ char *find_drm_node_by_devid(dev_t devid)
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return name;
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}
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void load_pnps(void)
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{
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// TODO: use hwdata's pkg-config file once they ship one
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const char *filename = "/usr/share/hwdata/pnp.ids";
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FILE *f = fopen(filename, "r");
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if (!f) {
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drm_log.infof("failed to open PNP IDs file at '%s'", filename);
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return;
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}
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char *line = NULL;
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size_t line_size = 0;
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while (getline(&line, &line_size, f) >= 0) {
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char *nl = strchr(line, '\n');
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if (nl) {
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*nl = '\0';
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}
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char *sep = strchr(line, '\t');
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if (!sep) {
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continue;
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}
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*sep = '\0';
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std::string id(line);
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std::string name(sep + 1);
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pnps[id] = name;
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}
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free(line);
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fclose(f);
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}
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bool init_drm(struct drm_t *drm, int width, int height, int refresh)
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{
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load_pnps();
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drm->preferred_width = width;
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drm->preferred_height = height;
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drm->preferred_refresh = refresh;
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@ -68,6 +68,9 @@ struct connector {
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uint32_t possible_crtcs;
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std::map<std::string, const drmModePropertyRes *> props;
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std::map<std::string, uint64_t> initial_prop_values;
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char *make;
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char *model;
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};
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struct fb {
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