diff options
| -rw-r--r-- | src/blueshift_drm_c.c | 120 |
1 files changed, 90 insertions, 30 deletions
diff --git a/src/blueshift_drm_c.c b/src/blueshift_drm_c.c index 21cc741..a4518d6 100644 --- a/src/blueshift_drm_c.c +++ b/src/blueshift_drm_c.c @@ -273,6 +273,70 @@ const char* blueshift_drm_get_connector_type_name() } +/** + * Get the current gamma ramps of the + * + * @param crtc_index The index of the CRTC to read from + * @param gamma_size The size a gamma ramp + * @param red Storage location for the red gamma ramp + * @param green Storage location for the green gamma ramp + * @param blue Storage location for the blue gamma ramp + * @return Zero on success + */ +int blueshift_drm_get_gamma_ramps(int crtc_index, int gamma_size, uint16_t* red, uint16_t* green, uint16_t* blue) +{ + int i; + + /* We need to initialise it to avoid valgrind warnings */ + for (i = 0; i < gamma_size; i++) + *(red + i) = *(green + i) = *(blue + i) = 0; + + return drmModeCrtcGetGamma(drm_fd, *(drm_res->crtcs + crtc_index), gamma_size, red, green, blue); +} + + +/** + * Get the extended display identification data for the monitor connected to the connector + * + * @param edid Storage location for the EDID, it should be 128 bytes, 256 bytes + zero termination if hex + * @param size The size allocated to `edid` excluding your zero termination + * @param hex Whether to convert to hexadecimal representation, this is preferable + * @return The length of the found value, 0 if none, as if hex is false + */ +long blueshift_drm_get_edid(char* edid, long size, int hex) +{ + long rc = 0; + int prop_i; + for (prop_i = 0; prop_i < connector->count_props; prop_i++) + { + drmModePropertyRes* prop = drmModeGetProperty(drm_fd, connector->props[prop_i]); + if (!strcmp("EDID", prop->name)) + { + drmModePropertyBlobRes* blob = drmModeGetPropertyBlob(drm_fd, connector->prop_values[prop_i]); + if (hex) + { + rc += blob->length; + uint32_t n = size / 2; + uint32_t i; + if (n < blob->length) + n = blob->length; + for (i = 0; i < n ; i++) + { + *(edid + i * 2 + 0) = "0123456789abcdef"[(*((char*)(blob->data) + i) >> 4) & 15]; + *(edid + i * 2 + 1) = "0123456789abcdef"[(*((char*)(blob->data) + i) >> 0) & 15]; + } + } + else + memcpy(edid, blob->data, (blob->length < size ? blob->length : size) * sizeof(char)); + drmModeFreePropertyBlob(blob); + prop_i = connector->count_props; /* stop to for loop */ + } + drmModeFreeProperty(prop); + } + return rc; +} + + int main(int argc, char** argv) { @@ -297,19 +361,15 @@ int main(int argc, char** argv) if (crtc >= 0) { int gamma_size = blueshift_drm_gamma_size(crtc); - uint16_t* red = alloca(gamma_size * sizeof(uint16_t)); - uint16_t* green = alloca(gamma_size * sizeof(uint16_t)); - uint16_t* blue = alloca(gamma_size * sizeof(uint16_t)); - int j; + uint16_t* red = alloca(3 * gamma_size * sizeof(uint16_t)); + uint16_t* green = red + gamma_size; + uint16_t* blue = green + gamma_size; printf("CRTC: %i\n", crtc); - /* We need to initialise it to avoid valgrind warnings */ - for (j = 0; j < gamma_size; j++) - *(red + j) = *(green + j) = *(blue + j) = 0; - - if (!drmModeCrtcGetGamma(drm_fd, *(drm_res->crtcs + crtc), gamma_size, red, green, blue)) + if (!blueshift_drm_get_gamma_ramps(crtc, gamma_size, red, green, blue)) { + int j; printf("Red:"); for (j = 0; j < gamma_size; j++) printf(" %u", *(red + j)); @@ -333,27 +393,27 @@ int main(int argc, char** argv) } } - int i; - for (i = 0; i < connector->count_props; i++) - { - drmModePropertyRes* prop; - prop = drmModeGetProperty(drm_fd, connector->props[i]); - if (!strcmp("EDID", prop->name)) - { - drmModePropertyBlobRes* blob = drmModeGetPropertyBlob(drm_fd, connector->prop_values[i]); - char* value = alloca((blob->length * 2 + 1) * sizeof(char)); - uint32_t j; - for (j = 0; j < blob->length; j++) - { - *(value + j * 2 + 0) = "0123456789abcdef"[(*((char*)(blob->data) + j) >> 4) & 15]; - *(value + j * 2 + 1) = "0123456789abcdef"[(*((char*)(blob->data) + j) >> 0) & 15]; - } - *(value + blob->length * 2) = 0; - printf("%s: %s\n", prop->name, value); - drmModeFreePropertyBlob(blob); - } - drmModeFreeProperty(prop); - } + { + long size = 128; + char* edid = malloc((size * 2 + 1) * sizeof(char)); + long n; + + *(edid + size * 2) = 0; + + n = blueshift_drm_get_edid(edid, size, 1); + if (n) + { + if (n > size) + { + size = n; + edid = realloc(edid, (size * 2 + 1) * sizeof(char)); + blueshift_drm_get_edid(edid, size, 1); + } + *(edid + n * 2) = 0; + printf("EDID: %s\n", edid); + } + free(edid); + } } printf("Connector type: %s (%i)\n", blueshift_drm_get_connector_type_name(), |