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-rw-r--r--src/gamma-linux-drm.c39
1 files changed, 36 insertions, 3 deletions
diff --git a/src/gamma-linux-drm.c b/src/gamma-linux-drm.c
index e5e3482..57127bf 100644
--- a/src/gamma-linux-drm.c
+++ b/src/gamma-linux-drm.c
@@ -400,9 +400,7 @@ int libgamma_linux_drm_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this
#endif
r = drmModeCrtcGetGamma(card->fd, (uint32_t)(this->crtc), (uint32_t)(ramps->red_size),
ramps->red, ramps->green, ramps->blue);
- if (r < 0)
- return LIBGAMMA_GAMMA_RAMP_READ_FAILED;
- return 0;
+ return r ? LIBGAMMA_GAMMA_RAMP_READ_FAILED : 0;
}
@@ -417,5 +415,40 @@ int libgamma_linux_drm_crtc_get_gamma_ramps(libgamma_crtc_state_t* restrict this
int libgamma_linux_drm_crtc_set_gamma_ramps(libgamma_crtc_state_t* restrict this,
libgamma_gamma_ramps_t ramps)
{
+ libgamma_drm_card_data_t* card = this->partition->data;
+ int r;
+#ifdef DEBUG
+ if ((ramps.red_size != ramps.green_size) ||
+ (ramps.red_size != ramps.blue_size))
+ return LIBGAMMA_MIXED_GAMMA_RAMP_SIZE;
+#endif
+ r = drmModeCrtcSetGamma(card->fd, (uint32_t)(size_t)(this->data),
+ (uint32_t)(ramps.red_size), ramps.red, ramps.green, ramps.blue);
+ if (r)
+ switch (errno)
+ {
+ case EACCES:
+ case EAGAIN:
+ case EIO:
+ /* Permission denied errors must be ignored, because we do not
+ * have permission to do this while a display server is active.
+ * We are also checking for some other error codes just in case. */
+ case EBUSY:
+ case EINPROGRESS:
+ /* It is hard to find documentation for DRM (in fact all of this is
+ * just based on the functions names and some testing,) perhaps we
+ * could get this if we are updating to fast. */
+ break;
+ case EBADF:
+ case ENODEV:
+ case ENXIO:
+ /* XXX: I have not actually tested removing my graphics card or,
+ * monitor but I imagine either of these is what would happen. */
+ return LIBGAMMA_GRAPHICS_CARD_REMOVED;
+
+ default:
+ return LIBGAMMA_ERRNO_SET;
+ }
+ return 0;
}