LXR linux/drivers/gpu/drm/udl/udl

   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 "drmP.h"
  14#include "drm_crtc.h"
  15#include "drm_edid.h"
  16#include "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
  22static 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
  47error:
  48        kfree(block);
  49        return NULL;
  50}
  51
  52static 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
  69static int udl_mode_valid(struct drm_connector *connector,
  70                          struct drm_display_mode *mode)
  71{
  72        return 0;
  73}
  74
  75static enum drm_connector_status
  76udl_detect(struct drm_connector *connector, bool force)
  77{
  78        if (drm_device_is_unplugged(connector->dev))
  79                return connector_status_disconnected;
  80        return connector_status_connected;
  81}
  82
  83struct drm_encoder *udl_best_single_encoder(struct drm_connector *connector)
  84{
  85        int enc_id = connector->encoder_ids[0];
  86        struct drm_mode_object *obj;
  87        struct drm_encoder *encoder;
  88
  89        obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
  90        if (!obj)
  91                return NULL;
  92        encoder = obj_to_encoder(obj);
  93        return encoder;
  94}
  95
  96int udl_connector_set_property(struct drm_connector *connector, struct drm_property *property,
  97                               uint64_t val)
  98{
  99        return 0;
 100}
 101
 102static void udl_connector_destroy(struct drm_connector *connector)
 103{
 104        drm_sysfs_connector_remove(connector);
 105        drm_connector_cleanup(connector);
 106        kfree(connector);
 107}
 108
 109struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 110        .get_modes = udl_get_modes,
 111        .mode_valid = udl_mode_valid,
 112        .best_encoder = udl_best_single_encoder,
 113};
 114
 115struct drm_connector_funcs udl_connector_funcs = {
 116        .dpms = drm_helper_connector_dpms,
 117        .detect = udl_detect,
 118        .fill_modes = drm_helper_probe_single_connector_modes,
 119        .destroy = udl_connector_destroy,
 120        .set_property = udl_connector_set_property,
 121};
 122
 123int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 124{
 125        struct drm_connector *connector;
 126
 127        connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
 128        if (!connector)
 129                return -ENOMEM;
 130
 131        drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
 132        drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 133
 134        drm_sysfs_connector_add(connector);
 135        drm_mode_connector_attach_encoder(connector, encoder);
 136
 137        drm_connector_attach_property(connector,
 138                                      dev->mode_config.dirty_info_property,
 139                                      1);
 140        return 0;
 141}
 142