drivers/gpu/drm/udl/udl_connector.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Red Hat
   4  * based in parts on udlfb.c:
   5  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   6  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   7  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   8  */
   9
  10 #include <drm/drm_atomic_state_helper.h>
  11 #include <drm/drm_crtc_helper.h>
  12 #include <drm/drm_probe_helper.h>
  13
  14 #include "udl_connector.h"
  15 #include "udl_drv.h"
  16
  17 static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
  18                                size_t len)
  19 {
  20         int ret, i;
  21         u8 *read_buff;
  22         struct udl_device *udl = data;
  23         struct usb_device *udev = udl_to_usb_device(udl);
  24
  25         read_buff = kmalloc(2, GFP_KERNEL);
  26         if (!read_buff)
  27                 return -1;
  28
  29         for (i = 0; i < len; i++) {
  30                 int bval = (i + block * EDID_LENGTH) << 8;
  31                 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  32                                       0x02, (0x80 | (0x02 << 5)), bval,
  33                                       0xA1, read_buff, 2, HZ);
  34                 if (ret < 1) {
  35                         DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  36                         kfree(read_buff);
  37                         return -1;
  38                 }
  39                 buf[i] = read_buff[1];
  40         }
  41
  42         kfree(read_buff);
  43         return 0;
  44 }
  45
  46 static int udl_get_modes(struct drm_connector *connector)
  47 {
  48         struct udl_drm_connector *udl_connector =
  49                                         container_of(connector,
  50                                         struct udl_drm_connector,
  51                                         connector);
  52
  53         drm_connector_update_edid_property(connector, udl_connector->edid);
  54         if (udl_connector->edid)
  55                 return drm_add_edid_modes(connector, udl_connector->edid);
  56         return 0;
  57 }
  58
  59 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
  60                           struct drm_display_mode *mode)
  61 {
  62         struct udl_device *udl = to_udl(connector->dev);
  63         if (!udl->sku_pixel_limit)
  64                 return 0;
  65
  66         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  67                 return MODE_VIRTUAL_Y;
  68
  69         return 0;
  70 }
  71
  72 static enum drm_connector_status
  73 udl_detect(struct drm_connector *connector, bool force)
  74 {
  75         struct udl_device *udl = to_udl(connector->dev);
  76         struct udl_drm_connector *udl_connector =
  77                                         container_of(connector,
  78                                         struct udl_drm_connector,
  79                                         connector);
  80
  81         /* cleanup previous edid */
  82         if (udl_connector->edid != NULL) {
  83                 kfree(udl_connector->edid);
  84                 udl_connector->edid = NULL;
  85         }
  86
  87         udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
  88         if (!udl_connector->edid)
  89                 return connector_status_disconnected;
  90
  91         return connector_status_connected;
  92 }
  93
  94 static void udl_connector_destroy(struct drm_connector *connector)
  95 {
  96         struct udl_drm_connector *udl_connector =
  97                                         container_of(connector,
  98                                         struct udl_drm_connector,
  99                                         connector);
 100
 101         drm_connector_cleanup(connector);
 102         kfree(udl_connector->edid);
 103         kfree(connector);
 104 }
 105
 106 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 107         .get_modes = udl_get_modes,
 108         .mode_valid = udl_mode_valid,
 109 };
 110
 111 static const struct drm_connector_funcs udl_connector_funcs = {
 112         .reset = drm_atomic_helper_connector_reset,
 113         .detect = udl_detect,
 114         .fill_modes = drm_helper_probe_single_connector_modes,
 115         .destroy = udl_connector_destroy,
 116         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 117         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 118 };
 119
 120 struct drm_connector *udl_connector_init(struct drm_device *dev)
 121 {
 122         struct udl_drm_connector *udl_connector;
 123         struct drm_connector *connector;
 124
 125         udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 126         if (!udl_connector)
 127                 return ERR_PTR(-ENOMEM);
 128
 129         connector = &udl_connector->connector;
 130         drm_connector_init(dev, connector, &udl_connector_funcs,
 131                            DRM_MODE_CONNECTOR_DVII);
 132         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 133
 134         connector->polled = DRM_CONNECTOR_POLL_HPD |
 135                 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 136
 137         return connector;
 138 }