xf86drm: Add platform and host1x bus support

ARM SoCs usually have their DRM/KMS devices on the platform bus, so add
support for that to enable these devices to be used with the drmDevice
infrastructure.

NVIDIA Tegra SoCs have an additional level in the hierarchy and DRM/KMS
devices can also be on the host1x bus. This is mostly equivalent to the
platform bus.

v4:
- continue on error to process platform or host1x device

v3:
- guard Linux-specific sysfs parsing code with #ifdef __linux__

v2:
- be careful not to overflow the full name
- read compatible strings into device info

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

1 files changed, 28 insertions, 2 deletions

diff --git a/xf86drm.h b/xf86drm.h
index 65d53219..0d927018 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -766,8 +766,10 @@ extern int drmPrimeFDToHandle(int fd, int prime_fd, uint32_t *handle);
 extern char *drmGetPrimaryDeviceNameFromFd(int fd);
 extern char *drmGetRenderDeviceNameFromFd(int fd);
 
-#define DRM_BUS_PCI   0
-#define DRM_BUS_USB   1
+#define DRM_BUS_PCI       0
+#define DRM_BUS_USB       1
+#define DRM_BUS_PLATFORM  2
+#define DRM_BUS_HOST1X    3
 
 typedef struct _drmPciBusInfo {
     uint16_t domain;
@@ -794,6 +796,26 @@ typedef struct _drmUsbDeviceInfo {
     uint16_t product;
 } drmUsbDeviceInfo, *drmUsbDeviceInfoPtr;
 
+#define DRM_PLATFORM_DEVICE_NAME_LEN 512
+
+typedef struct _drmPlatformBusInfo {
+    char fullname[DRM_PLATFORM_DEVICE_NAME_LEN];
+} drmPlatformBusInfo, *drmPlatformBusInfoPtr;
+
+typedef struct _drmPlatformDeviceInfo {
+    char **compatible; /* NULL terminated list of compatible strings */
+} drmPlatformDeviceInfo, *drmPlatformDeviceInfoPtr;
+
+#define DRM_HOST1X_DEVICE_NAME_LEN 512
+
+typedef struct _drmHost1xBusInfo {
+    char fullname[DRM_HOST1X_DEVICE_NAME_LEN];
+} drmHost1xBusInfo, *drmHost1xBusInfoPtr;
+
+typedef struct _drmHost1xDeviceInfo {
+    char **compatible; /* NULL terminated list of compatible strings */
+} drmHost1xDeviceInfo, *drmHost1xDeviceInfoPtr;
+
 typedef struct _drmDevice {
     char **nodes; /* DRM_NODE_MAX sized array */
     int available_nodes; /* DRM_NODE_* bitmask */
@@ -801,10 +823,14 @@ typedef struct _drmDevice {
     union {
         drmPciBusInfoPtr pci;
         drmUsbBusInfoPtr usb;
+        drmPlatformBusInfoPtr platform;
+        drmHost1xBusInfoPtr host1x;
     } businfo;
     union {
         drmPciDeviceInfoPtr pci;
         drmUsbDeviceInfoPtr usb;
+        drmPlatformDeviceInfoPtr platform;
+        drmHost1xDeviceInfoPtr host1x;
     } deviceinfo;
 } drmDevice, *drmDevicePtr;