drivers/gpu/drm/udl/udl_connector.c

   1 /*
   2  * Copyright (C) 2012 Red Hat
   3  * based in parts on udlfb.c:
   4  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   5  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   6  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License v2. See the file COPYING in the main directory of this archive for
  10  * more details.
  11  */
  12
  13 #include <drm/drmP.h>
  14 #include <drm/drm_crtc.h>
  15 #include <drm/drm_edid.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_probe_helper.h>
  18 #include "udl_connector.h"
  19 #include "udl_drv.h"
  20
  21 static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
  22                                                            u8 *buff)
  23 {
  24         int ret, i;
  25         u8 *read_buff;
  26
  27         read_buff = kmalloc(2, GFP_KERNEL);
  28         if (!read_buff)
  29                 return false;
  30
  31         for (i = 0; i < EDID_LENGTH; i++) {
  32                 int bval = (i + block_idx * EDID_LENGTH) << 8;
  33                 ret = usb_control_msg(udl->udev,
  34                                       usb_rcvctrlpipe(udl->udev, 0),
  35                                           (0x02), (0x80 | (0x02 << 5)), bval,
  36                                           0xA1, read_buff, 2, HZ);
  37                 if (ret < 1) {
  38                         DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  39                         kfree(read_buff);
  40                         return false;
  41                 }
  42                 buff[i] = read_buff[1];
  43         }
  44
  45         kfree(read_buff);
  46         return true;
  47 }
  48
  49 static bool udl_get_edid(struct udl_device *udl, u8 **result_buff,
  50                          int *result_buff_size)
  51 {
  52         int i, extensions;
  53         u8 *block_buff = NULL, *buff_ptr;
  54
  55         block_buff = kmalloc(EDID_LENGTH, GFP_KERNEL);
  56         if (block_buff == NULL)
  57                 return false;
  58
  59         if (udl_get_edid_block(udl, 0, block_buff) &&
  60             memchr_inv(block_buff, 0, EDID_LENGTH)) {
  61                 extensions = ((struct edid *)block_buff)->extensions;
  62                 if (extensions > 0) {
  63                         /* we have to read all extensions one by one */
  64                         *result_buff_size = EDID_LENGTH * (extensions + 1);
  65                         *result_buff = kmalloc(*result_buff_size, GFP_KERNEL);
  66                         buff_ptr = *result_buff;
  67                         if (buff_ptr == NULL) {
  68                                 kfree(block_buff);
  69                                 return false;
  70                         }
  71                         memcpy(buff_ptr, block_buff, EDID_LENGTH);
  72                         kfree(block_buff);
  73                         buff_ptr += EDID_LENGTH;
  74                         for (i = 1; i < extensions; ++i) {
  75                                 if (udl_get_edid_block(udl, i, buff_ptr)) {
  76                                         buff_ptr += EDID_LENGTH;
  77                                 } else {
  78                                         kfree(*result_buff);
  79                                         *result_buff = NULL;
  80                                         return false;
  81                                 }
  82                         }
  83                         return true;
  84                 }
  85                 /* we have only base edid block */
  86                 *result_buff = block_buff;
  87                 *result_buff_size = EDID_LENGTH;
  88                 return true;
  89         }
  90
  91         kfree(block_buff);
  92
  93         return false;
  94 }
  95
  96 static int udl_get_modes(struct drm_connector *connector)
  97 {
  98         struct udl_drm_connector *udl_connector =
  99                                         container_of(connector,
 100                                         struct udl_drm_connector,
 101                                         connector);
 102
 103         drm_connector_update_edid_property(connector, udl_connector->edid);
 104         if (udl_connector->edid)
 105                 return drm_add_edid_modes(connector, udl_connector->edid);
 106         return 0;
 107 }
 108
 109 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
 110                           struct drm_display_mode *mode)
 111 {
 112         struct udl_device *udl = connector->dev->dev_private;
 113         if (!udl->sku_pixel_limit)
 114                 return 0;
 115
 116         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
 117                 return MODE_VIRTUAL_Y;
 118
 119         return 0;
 120 }
 121
 122 static enum drm_connector_status
 123 udl_detect(struct drm_connector *connector, bool force)
 124 {
 125         u8 *edid_buff = NULL;
 126         int edid_buff_size = 0;
 127         struct udl_device *udl = connector->dev->dev_private;
 128         struct udl_drm_connector *udl_connector =
 129                                         container_of(connector,
 130                                         struct udl_drm_connector,
 131                                         connector);
 132
 133         /* cleanup previous edid */
 134         if (udl_connector->edid != NULL) {
 135                 kfree(udl_connector->edid);
 136                 udl_connector->edid = NULL;
 137         }
 138
 139
 140         if (!udl_get_edid(udl, &edid_buff, &edid_buff_size))
 141                 return connector_status_disconnected;
 142
 143         udl_connector->edid = (struct edid *)edid_buff;
 144
 145         return connector_status_connected;
 146 }
 147
 148 static struct drm_encoder*
 149 udl_best_single_encoder(struct drm_connector *connector)
 150 {
 151         int enc_id = connector->encoder_ids[0];
 152         return drm_encoder_find(connector->dev, NULL, enc_id);
 153 }
 154
 155 static int udl_connector_set_property(struct drm_connector *connector,
 156                                       struct drm_property *property,
 157                                       uint64_t val)
 158 {
 159         return 0;
 160 }
 161
 162 static void udl_connector_destroy(struct drm_connector *connector)
 163 {
 164         struct udl_drm_connector *udl_connector =
 165                                         container_of(connector,
 166                                         struct udl_drm_connector,
 167                                         connector);
 168
 169         drm_connector_unregister(connector);
 170         drm_connector_cleanup(connector);
 171         kfree(udl_connector->edid);
 172         kfree(connector);
 173 }
 174
 175 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 176         .get_modes = udl_get_modes,
 177         .mode_valid = udl_mode_valid,
 178         .best_encoder = udl_best_single_encoder,
 179 };
 180
 181 static const struct drm_connector_funcs udl_connector_funcs = {
 182         .dpms = drm_helper_connector_dpms,
 183         .detect = udl_detect,
 184         .fill_modes = drm_helper_probe_single_connector_modes,
 185         .destroy = udl_connector_destroy,
 186         .set_property = udl_connector_set_property,
 187 };
 188
 189 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 190 {
 191         struct udl_drm_connector *udl_connector;
 192         struct drm_connector *connector;
 193
 194         udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 195         if (!udl_connector)
 196                 return -ENOMEM;
 197
 198         connector = &udl_connector->connector;
 199         drm_connector_init(dev, connector, &udl_connector_funcs,
 200                            DRM_MODE_CONNECTOR_DVII);
 201         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 202
 203         drm_connector_register(connector);
 204         drm_connector_attach_encoder(connector, encoder);
 205         connector->polled = DRM_CONNECTOR_POLL_HPD |
 206                 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 207
 208         return 0;
 209 }