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->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
  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         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
  83 static 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
  96 static enum drm_connector_status
  97 udl_detect(struct drm_connector *connector, bool force)
  98 {
  99         if (drm_dev_is_unplugged(connector->dev))
 100                 return connector_status_disconnected;
 101         return connector_status_connected;
 102 }
 103
 104 static struct drm_encoder*
 105 udl_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
 111 static int udl_connector_set_property(struct drm_connector *connector,
 112                                       struct drm_property *property,
 113                                       uint64_t val)
 114 {
 115         return 0;
 116 }
 117
 118 static void udl_connector_destroy(struct drm_connector *connector)
 119 {
 120         drm_connector_unregister(connector);
 121         drm_connector_cleanup(connector);
 122         kfree(connector);
 123 }
 124
 125 static const 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
 131 static const 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
 139 int 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         return 0;
 154 }