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_drv.h"
  18
  19 /* dummy connector to just get EDID,
  20    all UDL appear to have a DVI-D */
  21
  22 static u8 *udl_get_edid(struct udl_device *udl)
  23 {
  24         u8 *block;
  25         char rbuf[3];
  26         int ret, i;
  27
  28         block = kmalloc(EDID_LENGTH, GFP_KERNEL);
  29         if (block == NULL)
  30                 return NULL;
  31
  32         for (i = 0; i < EDID_LENGTH; i++) {
  33                 ret = usb_control_msg(udl->ddev->usbdev,
  34                                       usb_rcvctrlpipe(udl->ddev->usbdev, 0), (0x02),
  35                                       (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
  36                                       HZ);
  37                 if (ret < 1) {
  38                         DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  39                         i--;
  40                         goto error;
  41                 }
  42                 block[i] = rbuf[1];
  43         }
  44
  45         return block;
  46
  47 error:
  48         kfree(block);
  49         return NULL;
  50 }
  51
  52 static int udl_get_modes(struct drm_connector *connector)
  53 {
  54         struct udl_device *udl = connector->dev->dev_private;
  55         struct edid *edid;
  56         int ret;
  57
  58         edid = (struct edid *)udl_get_edid(udl);
  59
  60         connector->display_info.raw_edid = (char *)edid;
  61
  62         drm_mode_connector_update_edid_property(connector, edid);
  63         ret = drm_add_edid_modes(connector, edid);
  64         connector->display_info.raw_edid = NULL;
  65         kfree(edid);
  66         return ret;
  67 }
  68
  69 static int udl_mode_valid(struct drm_connector *connector,
  70                           struct drm_display_mode *mode)
  71 {
  72         struct udl_device *udl = connector->dev->dev_private;
  73         if (!udl->sku_pixel_limit)
  74                 return 0;
  75
  76         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  77                 return MODE_VIRTUAL_Y;
  78
  79         return 0;
  80 }
  81
  82 static enum drm_connector_status
  83 udl_detect(struct drm_connector *connector, bool force)
  84 {
  85         if (drm_device_is_unplugged(connector->dev))
  86                 return connector_status_disconnected;
  87         return connector_status_connected;
  88 }
  89
  90 struct drm_encoder *udl_best_single_encoder(struct drm_connector *connector)
  91 {
  92         int enc_id = connector->encoder_ids[0];
  93         struct drm_mode_object *obj;
  94         struct drm_encoder *encoder;
  95
  96         obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
  97         if (!obj)
  98                 return NULL;
  99         encoder = obj_to_encoder(obj);
 100         return encoder;
 101 }
 102
 103 int udl_connector_set_property(struct drm_connector *connector, struct drm_property *property,
 104                                uint64_t val)
 105 {
 106         return 0;
 107 }
 108
 109 static void udl_connector_destroy(struct drm_connector *connector)
 110 {
 111         drm_sysfs_connector_remove(connector);
 112         drm_connector_cleanup(connector);
 113         kfree(connector);
 114 }
 115
 116 struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 117         .get_modes = udl_get_modes,
 118         .mode_valid = udl_mode_valid,
 119         .best_encoder = udl_best_single_encoder,
 120 };
 121
 122 struct drm_connector_funcs udl_connector_funcs = {
 123         .dpms = drm_helper_connector_dpms,
 124         .detect = udl_detect,
 125         .fill_modes = drm_helper_probe_single_connector_modes,
 126         .destroy = udl_connector_destroy,
 127         .set_property = udl_connector_set_property,
 128 };
 129
 130 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 131 {
 132         struct drm_connector *connector;
 133
 134         connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
 135         if (!connector)
 136                 return -ENOMEM;
 137
 138         drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
 139         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 140
 141         drm_sysfs_connector_add(connector);
 142         drm_mode_connector_attach_encoder(connector, encoder);
 143
 144         drm_connector_attach_property(connector,
 145                                       dev->mode_config.dirty_info_property,
 146                                       1);
 147         return 0;
 148 }