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;
  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->ddev->usbdev,
  38                                       usb_rcvctrlpipe(udl->ddev->usbdev, 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                         i--;
  44                         goto error;
  45                 }
  46                 block[i] = rbuf[1];
  47         }
  48
  49         kfree(rbuf);
  50         return block;
  51
  52 error:
  53         kfree(block);
  54         kfree(rbuf);
  55         return NULL;
  56 }
  57
  58 static int udl_get_modes(struct drm_connector *connector)
  59 {
  60         struct udl_device *udl = connector->dev->dev_private;
  61         struct edid *edid;
  62         int ret;
  63
  64         edid = (struct edid *)udl_get_edid(udl);
  65
  66         /*
  67          * We only read the main block, but if the monitor reports extension
  68          * blocks then the drm edid code expects them to be present, so patch
  69          * the extension count to 0.
  70          */
  71         edid->checksum += edid->extensions;
  72         edid->extensions = 0;
  73
  74         drm_mode_connector_update_edid_property(connector, edid);
  75         ret = drm_add_edid_modes(connector, edid);
  76         kfree(edid);
  77         return ret;
  78 }
  79
  80 static int udl_mode_valid(struct drm_connector *connector,
  81                           struct drm_display_mode *mode)
  82 {
  83         struct udl_device *udl = connector->dev->dev_private;
  84         if (!udl->sku_pixel_limit)
  85                 return 0;
  86
  87         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  88                 return MODE_VIRTUAL_Y;
  89
  90         return 0;
  91 }
  92
  93 static enum drm_connector_status
  94 udl_detect(struct drm_connector *connector, bool force)
  95 {
  96         if (drm_device_is_unplugged(connector->dev))
  97                 return connector_status_disconnected;
  98         return connector_status_connected;
  99 }
 100
 101 static struct drm_encoder*
 102 udl_best_single_encoder(struct drm_connector *connector)
 103 {
 104         int enc_id = connector->encoder_ids[0];
 105         struct drm_mode_object *obj;
 106         struct drm_encoder *encoder;
 107
 108         obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
 109         if (!obj)
 110                 return NULL;
 111         encoder = obj_to_encoder(obj);
 112         return encoder;
 113 }
 114
 115 static int udl_connector_set_property(struct drm_connector *connector,
 116                                       struct drm_property *property,
 117                                       uint64_t val)
 118 {
 119         return 0;
 120 }
 121
 122 static void udl_connector_destroy(struct drm_connector *connector)
 123 {
 124         drm_sysfs_connector_remove(connector);
 125         drm_connector_cleanup(connector);
 126         kfree(connector);
 127 }
 128
 129 static struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 130         .get_modes = udl_get_modes,
 131         .mode_valid = udl_mode_valid,
 132         .best_encoder = udl_best_single_encoder,
 133 };
 134
 135 static struct drm_connector_funcs udl_connector_funcs = {
 136         .dpms = drm_helper_connector_dpms,
 137         .detect = udl_detect,
 138         .fill_modes = drm_helper_probe_single_connector_modes,
 139         .destroy = udl_connector_destroy,
 140         .set_property = udl_connector_set_property,
 141 };
 142
 143 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 144 {
 145         struct drm_connector *connector;
 146
 147         connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
 148         if (!connector)
 149                 return -ENOMEM;
 150
 151         drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
 152         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 153
 154         drm_sysfs_connector_add(connector);
 155         drm_mode_connector_attach_encoder(connector, encoder);
 156
 157         drm_object_attach_property(&connector->base,
 158                                       dev->mode_config.dirty_info_property,
 159                                       1);
 160         return 0;
 161 }