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/drm_atomic_state_helper.h>
  11 #include <drm/drm_edid.h>
  12 #include <drm/drm_crtc_helper.h>
  13 #include <drm/drm_probe_helper.h>
  14
  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         struct usb_device *udev = udl_to_usb_device(udl);
  25
  26         read_buff = kmalloc(2, GFP_KERNEL);
  27         if (!read_buff)
  28                 return -1;
  29
  30         for (i = 0; i < len; i++) {
  31                 int bval = (i + block * EDID_LENGTH) << 8;
  32                 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
  33                                       0x02, (0x80 | (0x02 << 5)), bval,
  34                                       0xA1, read_buff, 2, 1000);
  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 = to_udl(connector->dev);
  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 = to_udl(connector->dev);
  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 void udl_connector_destroy(struct drm_connector *connector)
  96 {
  97         struct udl_drm_connector *udl_connector =
  98                                         container_of(connector,
  99                                         struct udl_drm_connector,
 100                                         connector);
 101
 102         drm_connector_cleanup(connector);
 103         kfree(udl_connector->edid);
 104         kfree(connector);
 105 }
 106
 107 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 108         .get_modes = udl_get_modes,
 109         .mode_valid = udl_mode_valid,
 110 };
 111
 112 static const struct drm_connector_funcs udl_connector_funcs = {
 113         .reset = drm_atomic_helper_connector_reset,
 114         .detect = udl_detect,
 115         .fill_modes = drm_helper_probe_single_connector_modes,
 116         .destroy = udl_connector_destroy,
 117         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 118         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 119 };
 120
 121 struct drm_connector *udl_connector_init(struct drm_device *dev)
 122 {
 123         struct udl_drm_connector *udl_connector;
 124         struct drm_connector *connector;
 125
 126         udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 127         if (!udl_connector)
 128                 return ERR_PTR(-ENOMEM);
 129
 130         connector = &udl_connector->connector;
 131         drm_connector_init(dev, connector, &udl_connector_funcs,
 132                            DRM_MODE_CONNECTOR_VGA);
 133         drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 134
 135         connector->polled = DRM_CONNECTOR_POLL_HPD |
 136                 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 137
 138         return connector;
 139 }