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 <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
  22static u8 *udl_get_edid(struct udl_device *udl)
  23{
  24        u8 *block;
  25        char *rbuf;
  26        int ret, i;
  27
  28        block = kmalloc(EDID_LENGTH, GFP_KERNEL);
  29        if (block == NULL)
  30                return NULL;
  31
  32        rbuf = kmalloc(2, GFP_KERNEL);
  33        if (rbuf == NULL)
  34                goto error;
  35
  36        for (i = 0; i < EDID_LENGTH; i++) {
  37                ret = usb_control_msg(udl->udev,
  38                                      usb_rcvctrlpipe(udl->udev, 0), (0x02),
  39                                      (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
  40                                      HZ);
  41                if (ret < 1) {
  42                        DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  43                        goto error;
  44                }
  45                block[i] = rbuf[1];
  46        }
  47
  48        kfree(rbuf);
  49        return block;
  50
  51error:
  52        kfree(block);
  53        kfree(rbuf);
  54        return NULL;
  55}
  56
  57static int udl_get_modes(struct drm_connector *connector)
  58{
  59        struct udl_device *udl = connector->dev->dev_private;
  60        struct edid *edid;
  61        int ret;
  62
  63        edid = (struct edid *)udl_get_edid(udl);
  64        if (!edid) {
  65                drm_mode_connector_update_edid_property(connector, NULL);
  66                return 0;
  67        }
  68
  69        /*
  70         * We only read the main block, but if the monitor reports extension
  71         * blocks then the drm edid code expects them to be present, so patch
  72         * the extension count to 0.
  73         */
  74        edid->checksum += edid->extensions;
  75        edid->extensions = 0;
  76
  77        drm_mode_connector_update_edid_property(connector, edid);
  78        ret = drm_add_edid_modes(connector, edid);
  79        kfree(edid);
  80        return ret;
  81}
  82
  83static int udl_mode_valid(struct drm_connector *connector,
  84                          struct drm_display_mode *mode)
  85{
  86        struct udl_device *udl = connector->dev->dev_private;
  87        if (!udl->sku_pixel_limit)
  88                return 0;
  89
  90        if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  91                return MODE_VIRTUAL_Y;
  92
  93        return 0;
  94}
  95
  96static enum drm_connector_status
  97udl_detect(struct drm_connector *connector, bool force)
  98{
  99        if (drm_device_is_unplugged(connector->dev))
 100                return connector_status_disconnected;
 101        return connector_status_connected;
 102}
 103
 104static struct drm_encoder*
 105udl_best_single_encoder(struct drm_connector *connector)
 106{
 107        int enc_id = connector->encoder_ids[0];
 108        return drm_encoder_find(connector->dev, enc_id);
 109}
 110
 111static int udl_connector_set_property(struct drm_connector *connector,
 112                                      struct drm_property *property,
 113                                      uint64_t val)
 114{
 115        return 0;
 116}
 117
 118static void udl_connector_destroy(struct drm_connector *connector)
 119{
 120        drm_connector_unregister(connector);
 121        drm_connector_cleanup(connector);
 122        kfree(connector);
 123}
 124
 125static 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
 131static 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
 139int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 140{
 141        struct drm_connector *connector;
 142
 143        connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
 144        if (!connector)
 145                return -ENOMEM;
 146
 147        drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
 148        drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 149
 150        drm_connector_register(connector);
 151        drm_mode_connector_attach_encoder(connector, encoder);
 152
 153        drm_object_attach_property(&connector->base,
 154                                      dev->mode_config.dirty_info_property,
 155                                      1);
 156        return 0;
 157}
 158