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 <[email protected]>
   6  * Copyright (C) 2009 Jaya Kumar <[email protected]>
   7  * Copyright (C) 2009 Bernie Thompson <[email protected]>
   8  */
   9
  10 #include <drm/drmP.h>
  11 #include <drm/drm_crtc.h>
  12 #include <drm/drm_edid.h>
  13 #include <drm/drm_crtc_helper.h>
  14 #include <drm/drm_probe_helper.h>
  15 #include "udl_connector.h"
  16 #include "udl_drv.h"
  17
  18 static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
  19                                size_t len)
  20 {
  21         int ret, i;
  22         u8 *read_buff;
  23         struct udl_device *udl = data;
  24
  25         read_buff = kmalloc(2, GFP_KERNEL);
  26         if (!read_buff)
  27                 return -1;
  28
  29         for (i = 0; i < len; i++) {
  30                 int bval = (i + block * EDID_LENGTH) << 8;
  31                 ret = usb_control_msg(udl->udev,
  32                                       usb_rcvctrlpipe(udl->udev, 0),
  33                                           (0x02), (0x80 | (0x02 << 5)), bval,
  34                                           0xA1, read_buff, 2, HZ);
  35                 if (ret < 1) {
  36                         DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  37                         kfree(read_buff);
  38                         return -1;
  39                 }
  40                 buf[i] = read_buff[1];
  41         }
  42
  43         kfree(read_buff);
  44         return 0;
  45 }
  46
  47 static int udl_get_modes(struct drm_connector *connector)
  48 {
  49         struct udl_drm_connector *udl_connector =
  50                                         container_of(connector,
  51                                         struct udl_drm_connector,
  52                                         connector);
  53
  54         drm_connector_update_edid_property(connector, udl_connector->edid);
  55         if (udl_connector->edid)
  56                 return drm_add_edid_modes(connector, udl_connector->edid);
  57         return 0;
  58 }
  59
  60 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
  61                           struct drm_display_mode *mode)
  62 {
  63         struct udl_device *udl = connector->dev->dev_private;
  64         if (!udl->sku_pixel_limit)
  65                 return 0;
  66
  67         if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  68                 return MODE_VIRTUAL_Y;
  69
  70         return 0;
  71 }
  72
  73 static enum drm_connector_status
  74 udl_detect(struct drm_connector *connector, bool force)
  75 {
  76         struct udl_device *udl = connector->dev->dev_private;
  77         struct udl_drm_connector *udl_connector =
  78                                         container_of(connector,
  79                                         struct udl_drm_connector,
  80                                         connector);
  81
  82         /* cleanup previous edid */
  83         if (udl_connector->edid != NULL) {
  84                 kfree(udl_connector->edid);
  85                 udl_connector->edid = NULL;
  86         }
  87
  88         udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
  89         if (!udl_connector->edid)
  90                 return connector_status_disconnected;
  91
  92         return connector_status_connected;
  93 }
  94
  95 static struct drm_encoder*
  96 udl_best_single_encoder(struct drm_connector *connector)
  97 {
  98         int enc_id = connector->encoder_ids[0];
  99         return drm_encoder_find(connector->dev, NULL, enc_id);
 100 }
 101
 102 static int udl_connector_set_property(struct drm_connector *connector,
 103                                       struct drm_property *property,
 104                                       uint64_t val)
 105 {
 106         return 0;
 107 }
 108
 109 static void udl_connector_destroy(struct drm_connector *connector)
 110 {
 111         struct udl_drm_connector *udl_connector =
 112                                         container_of(connector,
 113                                         struct udl_drm_connector,
 114                                         connector);
 115
 116         drm_connector_unregister(connector);
 117         drm_connector_cleanup(connector);
 118         kfree(udl_connector->edid);
 119         kfree(connector);
 120 }
 121
 122 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 123         .get_modes = udl_get_modes,
 124         .mode_valid = udl_mode_valid,
 125         .best_encoder = udl_best_single_encoder,
 126 };
 127
 128 static const struct drm_connector_funcs udl_connector_funcs = {
 129         .dpms = drm_helper_connector_dpms,
 130         .detect = udl_detect,
 131         .fill_modes = drm_helper_probe_single_connector_modes,
 132         .destroy = udl_connector_destroy,
 133         .set_property = udl_connector_set_property,
 134 };
 135
 136 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
 137 {
 138         struct udl_drm_connector *udl_connector;
 139         struct drm_connector *connector;
 140
 141         udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 142         if (!udl_connector)
 143                 return -ENOMEM;
 144
 145         connector = &udl_connector->connector;
 146         drm_connector_init(dev, connector, &udl_connector_funcs,
 147                            DRM_MODE_CONNECTOR_DVII);
 148         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 149
 150         drm_connector_register(connector);
 151         drm_connector_attach_encoder(connector, encoder);
 152         connector->polled = DRM_CONNECTOR_POLL_HPD |
 153                 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 154
 155         return 0;
 156 }