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 <[email protected]>
   5  * Copyright (C) 2009 Jaya Kumar <[email protected]>
   6  * Copyright (C) 2009 Bernie Thompson <[email protected]>
   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 int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
  22                                size_t len)
  23 {
  24         int ret, i;
  25         u8 *read_buff;
  26         struct udl_device *udl = data;
  27
  28         read_buff = kmalloc(2, GFP_KERNEL);
  29         if (!read_buff)
  30                 return -1;
  31
  32         for (i = 0; i < len; i++) {
  33                 int bval = (i + block * EDID_LENGTH) << 8;
  34                 ret = usb_control_msg(udl->udev,
  35                                       usb_rcvctrlpipe(udl->udev, 0),
  36                                           (0x02), (0x80 | (0x02 << 5)), bval,
  37                                           0xA1, read_buff, 2, HZ);
  38                 if (ret < 1) {
  39                         DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  40                         kfree(read_buff);
  41                         return -1;
  42                 }
  43                 buf[i] = read_buff[1];
  44         }
  45
  46         kfree(read_buff);
  47         return 0;
  48 }
  49
  50 static int udl_get_modes(struct drm_connector *connector)
  51 {
  52         struct udl_drm_connector *udl_connector =
  53                                         container_of(connector,
  54                                         struct udl_drm_connector,
  55                                         connector);
  56
  57         drm_connector_update_edid_property(connector, udl_connector->edid);
  58         if (udl_connector->edid)
  59                 return drm_add_edid_modes(connector, udl_connector->edid);
  60         return 0;
  61 }
  62
  63 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
  64                           struct drm_display_mode *mode)
  65 {
  66         struct udl_device *udl = connector->dev->dev_private;
  67         if (!udl->sku_pixel_limit)
  68                 return 0;
  69
  70         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  71                 return MODE_VIRTUAL_Y;
  72
  73         return 0;
  74 }
  75
  76 static enum drm_connector_status
  77 udl_detect(struct drm_connector *connector, bool force)
  78 {
  79         struct udl_device *udl = connector->dev->dev_private;
  80         struct udl_drm_connector *udl_connector =
  81                                         container_of(connector,
  82                                         struct udl_drm_connector,
  83                                         connector);
  84
  85         /* cleanup previous edid */
  86         if (udl_connector->edid != NULL) {
  87                 kfree(udl_connector->edid);
  88                 udl_connector->edid = NULL;
  89         }
  90
  91         udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
  92         if (!udl_connector->edid)
  93                 return connector_status_disconnected;
  94
  95         return connector_status_connected;
  96 }
  97
  98 static struct drm_encoder*
  99 udl_best_single_encoder(struct drm_connector *connector)
 100 {
 101         int enc_id = connector->encoder_ids[0];
 102         return drm_encoder_find(connector->dev, NULL, enc_id);
 103 }
 104
 105 static int udl_connector_set_property(struct drm_connector *connector,
 106                                       struct drm_property *property,
 107                                       uint64_t val)
 108 {
 109         return 0;
 110 }
 111
 112 static void udl_connector_destroy(struct drm_connector *connector)
 113 {
 114         struct udl_drm_connector *udl_connector =
 115                                         container_of(connector,
 116                                         struct udl_drm_connector,
 117                                         connector);
 118
 119         drm_connector_unregister(connector);
 120         drm_connector_cleanup(connector);
 121         kfree(udl_connector->edid);
 122         kfree(connector);
 123 }
 124
 125 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 126         .get_modes = udl_get_modes,
 127         .mode_valid = udl_mode_valid,
 128         .best_encoder = udl_best_single_encoder,
 129 };
 130
 131 static const struct drm_connector_funcs udl_connector_funcs = {
 132         .dpms = drm_helper_connector_dpms,
 133         .detect = udl_detect,
 134         .fill_modes = drm_helper_probe_single_connector_modes,
 135         .destroy = udl_connector_destroy,
 136         .set_property = udl_connector_set_property,
 137 };
 138
 139 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 140 {
 141         struct udl_drm_connector *udl_connector;
 142         struct drm_connector *connector;
 143
 144         udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 145         if (!udl_connector)
 146                 return -ENOMEM;
 147
 148         connector = &udl_connector->connector;
 149         drm_connector_init(dev, connector, &udl_connector_funcs,
 150                            DRM_MODE_CONNECTOR_DVII);
 151         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 152
 153         drm_connector_register(connector);
 154         drm_connector_attach_encoder(connector, encoder);
 155         connector->polled = DRM_CONNECTOR_POLL_HPD |
 156                 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 157
 158         return 0;
 159 }