| Révision | aa8425da5a098b45f1480954cbdc3469c07ece1f (tree) |
|---|---|
| l'heure | 2019-01-14 01:06:59 |
| Auteur | Chih-Wei Huang <cwhuang@linu...> |
| Commiter | Chih-Wei Huang |
xf86drm: add drmOpenByFB
The new function looks up the DRM device with specified type
associated with the specified framebuffer and opens it.
Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>
| @@ -790,6 +790,48 @@ drm_public int drmOpenRender(int minor) | ||
| 790 | 790 | } |
| 791 | 791 | |
| 792 | 792 | /** |
| 793 | + * Open the DRM device with specified type of specified framebuffer. | |
| 794 | + * | |
| 795 | + * Looks up the associated DRM device with specified type of the | |
| 796 | + * specified framebuffer and opens it. | |
| 797 | + * | |
| 798 | + * \param fb the index of framebuffer. | |
| 799 | + * \param type the device node type to open, PRIMARY, CONTROL or RENDER | |
| 800 | + * | |
| 801 | + * \return a file descriptor on success, or a negative value on error. | |
| 802 | + * | |
| 803 | + */ | |
| 804 | +drm_public int drmOpenByFB(int fb, int type) | |
| 805 | +{ | |
| 806 | +#ifdef __linux__ | |
| 807 | + DIR *sysdir; | |
| 808 | + struct dirent *ent; | |
| 809 | + char buf[64]; | |
| 810 | + const char *name = drmGetMinorName(type); | |
| 811 | + int fd = -1, len = strlen(name); | |
| 812 | + | |
| 813 | + snprintf(buf, sizeof(buf), "/sys/class/graphics/fb%d/device/drm", fb); | |
| 814 | + sysdir = opendir(buf); | |
| 815 | + if (!sysdir) | |
| 816 | + return -errno; | |
| 817 | + | |
| 818 | + while ((ent = readdir(sysdir))) { | |
| 819 | + if (!strncmp(ent->d_name, name, len)) { | |
| 820 | + snprintf(buf, sizeof(buf), "%s/%s", DRM_DIR_NAME, ent->d_name); | |
| 821 | + fd = open(buf, O_RDWR | O_CLOEXEC, 0); | |
| 822 | + break; | |
| 823 | + } | |
| 824 | + } | |
| 825 | + | |
| 826 | + closedir(sysdir); | |
| 827 | + return fd; | |
| 828 | +#else | |
| 829 | +#warning "Missing implementation of drmOpenByFB" | |
| 830 | + return -EINVAL; | |
| 831 | +#endif | |
| 832 | +} | |
| 833 | + | |
| 834 | +/** | |
| 793 | 835 | * Free the version information returned by drmGetVersion(). |
| 794 | 836 | * |
| 795 | 837 | * \param v pointer to the version information. |
| @@ -570,6 +570,7 @@ extern int drmOpenWithType(const char *name, const char *busid, | ||
| 570 | 570 | |
| 571 | 571 | extern int drmOpenControl(int minor); |
| 572 | 572 | extern int drmOpenRender(int minor); |
| 573 | +extern int drmOpenByFB(int fb, int type); | |
| 573 | 574 | extern int drmClose(int fd); |
| 574 | 575 | extern drmVersionPtr drmGetVersion(int fd); |
| 575 | 576 | extern drmVersionPtr drmGetLibVersion(int fd); |
Android-x86
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xf86drm.c
xf86drm.h