drivers/gpu/drm/udl/udl_connector.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Red Hat
   4  * based in parts on udlfb.c:
   5  * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   6  * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   7  * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   8  */
   9
  10 #include <drm/drm_crtc_helper.h>
  11 #include <drm/drm_probe_helper.h>
  12
  13 #include "udl_connector.h"
  14 #include "udl_drv.h"
  15
  16 static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
  17                                size_t len)
  18 {
  19         int ret, i;
  20         u8 *read_buff;
  21         struct udl_device *udl = data;
  22
  23         read_buff = kmalloc(2, GFP_KERNEL);
  24         if (!read_buff)
  25                 return -1;
  26
  27         for (i = 0; i < len; i++) {
  28                 int bval = (i + block * EDID_LENGTH) << 8;
  29                 ret = usb_control_msg(udl->udev,
  30                                       usb_rcvctrlpipe(udl->udev, 0),
  31                                           (0x02), (0x80 | (0x02 << 5)), bval,
  32                                           0xA1, read_buff, 2, HZ);
  33                 if (ret < 1) {
  34                         DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  35                         kfree(read_buff);
  36                         return -1;
  37                 }
  38                 buf[i] = read_buff[1];
  39         }
  40
  41         kfree(read_buff);
  42         return 0;
  43 }
  44
  45 static int udl_get_modes(struct drm_connector *connector)
  46 {
  47         struct udl_drm_connector *udl_connector =
  48                                         container_of(connector,
  49                                         struct udl_drm_connector,
  50                                         connector);
  51
  52         drm_connector_update_edid_property(connector, udl_connector->edid);
  53         if (udl_connector->edid)
  54                 return drm_add_edid_modes(connector, udl_connector->edid);
  55         return 0;
  56 }
  57
  58 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
  59                           struct drm_display_mode *mode)
  60 {
  61         struct udl_device *udl = connector->dev->dev_private;
  62         if (!udl->sku_pixel_limit)
  63                 return 0;
  64
  65         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  66                 return MODE_VIRTUAL_Y;
  67
  68         return 0;
  69 }
  70
  71 static enum drm_connector_status
  72 udl_detect(struct drm_connector *connector, bool force)
  73 {
  74         struct udl_device *udl = connector->dev->dev_private;
  75         struct udl_drm_connector *udl_connector =
  76                                         container_of(connector,
  77                                         struct udl_drm_connector,
  78                                         connector);
  79
  80         /* cleanup previous edid */
  81         if (udl_connector->edid != NULL) {
  82                 kfree(udl_connector->edid);
  83                 udl_connector->edid = NULL;
  84         }
  85
  86         udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
  87         if (!udl_connector->edid)
  88                 return connector_status_disconnected;
  89
  90         return connector_status_connected;
  91 }
  92
  93 static struct drm_encoder*
  94 udl_best_single_encoder(struct drm_connector *connector)
  95 {
  96         int enc_id = connector->encoder_ids[0];
  97         return drm_encoder_find(connector->dev, NULL, enc_id);
  98 }
  99
 100 static int udl_connector_set_property(struct drm_connector *connector,
 101                                       struct drm_property *property,
 102                                       uint64_t val)
 103 {
 104         return 0;
 105 }
 106
 107 static void udl_connector_destroy(struct drm_connector *connector)
 108 {
 109         struct udl_drm_connector *udl_connector =
 110                                         container_of(connector,
 111                                         struct udl_drm_connector,
 112                                         connector);
 113
 114         drm_connector_unregister(connector);
 115         drm_connector_cleanup(connector);
 116         kfree(udl_connector->edid);
 117         kfree(connector);
 118 }
 119
 120 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 121         .get_modes = udl_get_modes,
 122         .mode_valid = udl_mode_valid,
 123         .best_encoder = udl_best_single_encoder,
 124 };
 125
 126 static const struct drm_connector_funcs udl_connector_funcs = {
 127         .dpms = drm_helper_connector_dpms,
 128         .detect = udl_detect,
 129         .fill_modes = drm_helper_probe_single_connector_modes,
 130         .destroy = udl_connector_destroy,
 131         .set_property = udl_connector_set_property,
 132 };
 133
 134 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 135 {
 136         struct udl_drm_connector *udl_connector;
 137         struct drm_connector *connector;
 138
 139         udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 140         if (!udl_connector)
 141                 return -ENOMEM;
 142
 143         connector = &udl_connector->connector;
 144         drm_connector_init(dev, connector, &udl_connector_funcs,
 145                            DRM_MODE_CONNECTOR_DVII);
 146         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 147
 148         drm_connector_register(connector);
 149         drm_connector_attach_encoder(connector, encoder);
 150         connector->polled = DRM_CONNECTOR_POLL_HPD |
 151                 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 152
 153         return 0;
 154 }