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