drivers/gpu/drm/tegra/bus.c

   1 /*
   2  * Copyright (C) 2013 NVIDIA Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include "drm.h"
  10
  11 static int drm_host1x_set_busid(struct drm_device *dev,
  12                                 struct drm_master *master)
  13 {
  14         const char *device = dev_name(dev->dev);
  15         const char *driver = dev->driver->name;
  16         const char *bus = dev->dev->bus->name;
  17         int length;
  18
  19         master->unique_len = strlen(bus) + 1 + strlen(device);
  20         master->unique_size = master->unique_len;
  21
  22         master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
  23         if (!master->unique)
  24                 return -ENOMEM;
  25
  26         snprintf(master->unique, master->unique_len + 1, "%s:%s", bus, device);
  27
  28         length = strlen(driver) + 1 + master->unique_len;
  29
  30         dev->devname = kmalloc(length + 1, GFP_KERNEL);
  31         if (!dev->devname)
  32                 return -ENOMEM;
  33
  34         snprintf(dev->devname, length + 1, "%s@%s", driver, master->unique);
  35
  36         return 0;
  37 }
  38
  39 static struct drm_bus drm_host1x_bus = {
  40         .bus_type = DRIVER_BUS_HOST1X,
  41         .set_busid = drm_host1x_set_busid,
  42 };
  43
  44 int drm_host1x_init(struct drm_driver *driver, struct host1x_device *device)
  45 {
  46         struct drm_device *drm;
  47         int ret;
  48
  49         driver->bus = &drm_host1x_bus;
  50
  51         drm = drm_dev_alloc(driver, &device->dev);
  52         if (!drm)
  53                 return -ENOMEM;
  54
  55         ret = drm_dev_register(drm, 0);
  56         if (ret)
  57                 goto err_free;
  58
  59         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
  60                  driver->major, driver->minor, driver->patchlevel,
  61                  driver->date, drm->primary->index);
  62
  63         return 0;
  64
  65 err_free:
  66         drm_dev_free(drm);
  67         return ret;
  68 }
  69
  70 void drm_host1x_exit(struct drm_driver *driver, struct host1x_device *device)
  71 {
  72         struct tegra_drm *tegra = dev_get_drvdata(&device->dev);
  73
  74         drm_put_dev(tegra->drm);
  75 }