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