drivers/gpu/drm/vkms/vkms_drv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <linux/module.h>
   4 #include <drm/drm_gem.h>
   5 #include <drm/drm_crtc_helper.h>
   6 #include <drm/drm_atomic_helper.h>
   7 #include <drm/drm_gem_framebuffer_helper.h>
   8 #include <drm/drm_fb_helper.h>
   9 #include "vkms_drv.h"
  10
  11 #define DRIVER_NAME     "vkms"
  12 #define DRIVER_DESC     "Virtual Kernel Mode Setting"
  13 #define DRIVER_DATE     "20180514"
  14 #define DRIVER_MAJOR    1
  15 #define DRIVER_MINOR    0
  16
  17 static struct vkms_device *vkms_device;
  18
  19 static const struct file_operations vkms_driver_fops = {
  20         .owner          = THIS_MODULE,
  21         .open           = drm_open,
  22         .mmap           = drm_gem_mmap,
  23         .unlocked_ioctl = drm_ioctl,
  24         .compat_ioctl   = drm_compat_ioctl,
  25         .poll           = drm_poll,
  26         .read           = drm_read,
  27         .llseek         = no_llseek,
  28         .release        = drm_release,
  29 };
  30
  31 static const struct vm_operations_struct vkms_gem_vm_ops = {
  32         .fault = vkms_gem_fault,
  33         .open = drm_gem_vm_open,
  34         .close = drm_gem_vm_close,
  35 };
  36
  37 static void vkms_release(struct drm_device *dev)
  38 {
  39         struct vkms_device *vkms = container_of(dev, struct vkms_device, drm);
  40
  41         platform_device_unregister(vkms->platform);
  42         drm_atomic_helper_shutdown(&vkms->drm);
  43         drm_mode_config_cleanup(&vkms->drm);
  44         drm_dev_fini(&vkms->drm);
  45 }
  46
  47 static struct drm_driver vkms_driver = {
  48         .driver_features        = DRIVER_MODESET | DRIVER_ATOMIC | DRIVER_GEM,
  49         .release                = vkms_release,
  50         .fops                   = &vkms_driver_fops,
  51         .dumb_create            = vkms_dumb_create,
  52         .dumb_map_offset        = vkms_dumb_map,
  53         .gem_vm_ops             = &vkms_gem_vm_ops,
  54         .gem_free_object_unlocked = vkms_gem_free_object,
  55         .get_vblank_timestamp   = vkms_get_vblank_timestamp,
  56
  57         .name                   = DRIVER_NAME,
  58         .desc                   = DRIVER_DESC,
  59         .date                   = DRIVER_DATE,
  60         .major                  = DRIVER_MAJOR,
  61         .minor                  = DRIVER_MINOR,
  62 };
  63
  64 static const struct drm_mode_config_funcs vkms_mode_funcs = {
  65         .fb_create = drm_gem_fb_create,
  66         .atomic_check = drm_atomic_helper_check,
  67         .atomic_commit = drm_atomic_helper_commit,
  68 };
  69
  70 static int vkms_modeset_init(struct vkms_device *vkmsdev)
  71 {
  72         struct drm_device *dev = &vkmsdev->drm;
  73
  74         drm_mode_config_init(dev);
  75         dev->mode_config.funcs = &vkms_mode_funcs;
  76         dev->mode_config.min_width = XRES_MIN;
  77         dev->mode_config.min_height = YRES_MIN;
  78         dev->mode_config.max_width = XRES_MAX;
  79         dev->mode_config.max_height = YRES_MAX;
  80
  81         return vkms_output_init(vkmsdev);
  82 }
  83
  84 static int __init vkms_init(void)
  85 {
  86         int ret;
  87
  88         vkms_device = kzalloc(sizeof(*vkms_device), GFP_KERNEL);
  89         if (!vkms_device)
  90                 return -ENOMEM;
  91
  92         ret = drm_dev_init(&vkms_device->drm, &vkms_driver, NULL);
  93         if (ret)
  94                 goto out_free;
  95
  96         vkms_device->platform =
  97                 platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
  98         if (IS_ERR(vkms_device->platform)) {
  99                 ret = PTR_ERR(vkms_device->platform);
 100                 goto out_fini;
 101         }
 102
 103         vkms_device->drm.irq_enabled = true;
 104
 105         ret = drm_vblank_init(&vkms_device->drm, 1);
 106         if (ret) {
 107                 DRM_ERROR("Failed to vblank\n");
 108                 goto out_fini;
 109         }
 110
 111         ret = vkms_modeset_init(vkms_device);
 112         if (ret)
 113                 goto out_unregister;
 114
 115         ret = drm_dev_register(&vkms_device->drm, 0);
 116         if (ret)
 117                 goto out_unregister;
 118
 119         return 0;
 120
 121 out_unregister:
 122         platform_device_unregister(vkms_device->platform);
 123
 124 out_fini:
 125         drm_dev_fini(&vkms_device->drm);
 126
 127 out_free:
 128         kfree(vkms_device);
 129         return ret;
 130 }
 131
 132 static void __exit vkms_exit(void)
 133 {
 134         if (!vkms_device) {
 135                 DRM_INFO("vkms_device is NULL.\n");
 136                 return;
 137         }
 138
 139         drm_dev_unregister(&vkms_device->drm);
 140         drm_dev_put(&vkms_device->drm);
 141
 142         kfree(vkms_device);
 143 }
 144
 145 module_init(vkms_init);
 146 module_exit(vkms_exit);
 147
 148 MODULE_AUTHOR("Haneen Mohammed <hamohammed.sa@gmail.com>");
 149 MODULE_AUTHOR("Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>");
 150 MODULE_DESCRIPTION(DRIVER_DESC);
 151 MODULE_LICENSE("GPL");