drivers/gpu/drm/vkms/vkms_drv.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <drm/drm_gem.h>
  10 #include <drm/drm_crtc_helper.h>
  11 #include <drm/drm_atomic_helper.h>
  12 #include <drm/drm_gem_framebuffer_helper.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include "vkms_drv.h"
  15
  16 #define DRIVER_NAME     "vkms"
  17 #define DRIVER_DESC     "Virtual Kernel Mode Setting"
  18 #define DRIVER_DATE     "20180514"
  19 #define DRIVER_MAJOR    1
  20 #define DRIVER_MINOR    0
  21
  22 static struct vkms_device *vkms_device;
  23
  24 static const struct file_operations vkms_driver_fops = {
  25         .owner          = THIS_MODULE,
  26         .open           = drm_open,
  27         .mmap           = drm_gem_mmap,
  28         .unlocked_ioctl = drm_ioctl,
  29         .compat_ioctl   = drm_compat_ioctl,
  30         .poll           = drm_poll,
  31         .read           = drm_read,
  32         .llseek         = no_llseek,
  33         .release        = drm_release,
  34 };
  35
  36 static const struct vm_operations_struct vkms_gem_vm_ops = {
  37         .fault = vkms_gem_fault,
  38         .open = drm_gem_vm_open,
  39         .close = drm_gem_vm_close,
  40 };
  41
  42 static void vkms_release(struct drm_device *dev)
  43 {
  44         struct vkms_device *vkms = container_of(dev, struct vkms_device, drm);
  45
  46         platform_device_unregister(vkms->platform);
  47         drm_atomic_helper_shutdown(&vkms->drm);
  48         drm_mode_config_cleanup(&vkms->drm);
  49         drm_dev_fini(&vkms->drm);
  50 }
  51
  52 static struct drm_driver vkms_driver = {
  53         .driver_features        = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
  54         .release                = vkms_release,
  55         .fops                   = &vkms_driver_fops,
  56         .dumb_create            = vkms_dumb_create,
  57         .dumb_map_offset        = vkms_dumb_map,
  58         .gem_vm_ops             = &vkms_gem_vm_ops,
  59         .gem_free_object_unlocked = vkms_gem_free_object,
  60         .get_vblank_timestamp   = vkms_get_vblank_timestamp,
  61
  62         .name                   = DRIVER_NAME,
  63         .desc                   = DRIVER_DESC,
  64         .date                   = DRIVER_DATE,
  65         .major                  = DRIVER_MAJOR,
  66         .minor                  = DRIVER_MINOR,
  67 };
  68
  69 static const struct drm_mode_config_funcs vkms_mode_funcs = {
  70         .fb_create = drm_gem_fb_create,
  71         .atomic_check = drm_atomic_helper_check,
  72         .atomic_commit = drm_atomic_helper_commit,
  73 };
  74
  75 static int vkms_modeset_init(struct vkms_device *vkmsdev)
  76 {
  77         struct drm_device *dev = &vkmsdev->drm;
  78
  79         drm_mode_config_init(dev);
  80         dev->mode_config.funcs = &vkms_mode_funcs;
  81         dev->mode_config.min_width = XRES_MIN;
  82         dev->mode_config.min_height = YRES_MIN;
  83         dev->mode_config.max_width = XRES_MAX;
  84         dev->mode_config.max_height = YRES_MAX;
  85
  86         return vkms_output_init(vkmsdev);
  87 }
  88
  89 static int __init vkms_init(void)
  90 {
  91         int ret;
  92
  93         vkms_device = kzalloc(sizeof(*vkms_device), GFP_KERNEL);
  94         if (!vkms_device)
  95                 return -ENOMEM;
  96
  97         ret = drm_dev_init(&vkms_device->drm, &vkms_driver, NULL);
  98         if (ret)
  99                 goto out_free;
 100
 101         vkms_device->platform =
 102                 platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 103         if (IS_ERR(vkms_device->platform)) {
 104                 ret = PTR_ERR(vkms_device->platform);
 105                 goto out_fini;
 106         }
 107
 108         vkms_device->drm.irq_enabled = true;
 109
 110         ret = drm_vblank_init(&vkms_device->drm, 1);
 111         if (ret) {
 112                 DRM_ERROR("Failed to vblank\n");
 113                 goto out_fini;
 114         }
 115
 116         ret = vkms_modeset_init(vkms_device);
 117         if (ret)
 118                 goto out_unregister;
 119
 120         ret = drm_dev_register(&vkms_device->drm, 0);
 121         if (ret)
 122                 goto out_unregister;
 123
 124         return 0;
 125
 126 out_unregister:
 127         platform_device_unregister(vkms_device->platform);
 128
 129 out_fini:
 130         drm_dev_fini(&vkms_device->drm);
 131
 132 out_free:
 133         kfree(vkms_device);
 134         return ret;
 135 }
 136
 137 static void __exit vkms_exit(void)
 138 {
 139         if (!vkms_device) {
 140                 DRM_INFO("vkms_device is NULL.\n");
 141                 return;
 142         }
 143
 144         drm_dev_unregister(&vkms_device->drm);
 145         drm_dev_put(&vkms_device->drm);
 146
 147         kfree(vkms_device);
 148 }
 149
 150 module_init(vkms_init);
 151 module_exit(vkms_exit);
 152
 153 MODULE_AUTHOR("Haneen Mohammed <hamohammed.sa@gmail.com>");
 154 MODULE_AUTHOR("Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>");
 155 MODULE_DESCRIPTION(DRIVER_DESC);
 156 MODULE_LICENSE("GPL");