LXR linux/drivers/gpu/drm/udl/udl

   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_atomic_state_helper.h>
  11#include <drm/drm_crtc_helper.h>
  12#include <drm/drm_probe_helper.h>
  13
  14#include "udl_connector.h"
  15#include "udl_drv.h"
  16
  17static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
  18                               size_t len)
  19{
  20        int ret, i;
  21        u8 *read_buff;
  22        struct udl_device *udl = data;
  23        struct usb_device *udev = udl_to_usb_device(udl);
  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(udev, usb_rcvctrlpipe(udev, 0),
  32                                      0x02, (0x80 | (0x02 << 5)), bval,
  33                                      0xA1, read_buff, 2, HZ);
  34                if (ret < 1) {
  35                        DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
  36                        kfree(read_buff);
  37                        return -1;
  38                }
  39                buf[i] = read_buff[1];
  40        }
  41
  42        kfree(read_buff);
  43        return 0;
  44}
  45
  46static int udl_get_modes(struct drm_connector *connector)
  47{
  48        struct udl_drm_connector *udl_connector =
  49                                        container_of(connector,
  50                                        struct udl_drm_connector,
  51                                        connector);
  52
  53        drm_connector_update_edid_property(connector, udl_connector->edid);
  54        if (udl_connector->edid)
  55                return drm_add_edid_modes(connector, udl_connector->edid);
  56        return 0;
  57}
  58
  59static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
  60                          struct drm_display_mode *mode)
  61{
  62        struct udl_device *udl = to_udl(connector->dev);
  63        if (!udl->sku_pixel_limit)
  64                return 0;
  65
  66        if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
  67                return MODE_VIRTUAL_Y;
  68
  69        return 0;
  70}
  71
  72static enum drm_connector_status
  73udl_detect(struct drm_connector *connector, bool force)
  74{
  75        struct udl_device *udl = to_udl(connector->dev);
  76        struct udl_drm_connector *udl_connector =
  77                                        container_of(connector,
  78                                        struct udl_drm_connector,
  79                                        connector);
  80
  81        /* cleanup previous edid */
  82        if (udl_connector->edid != NULL) {
  83                kfree(udl_connector->edid);
  84                udl_connector->edid = NULL;
  85        }
  86
  87        udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
  88        if (!udl_connector->edid)
  89                return connector_status_disconnected;
  90
  91        return connector_status_connected;
  92}
  93
  94static void udl_connector_destroy(struct drm_connector *connector)
  95{
  96        struct udl_drm_connector *udl_connector =
  97                                        container_of(connector,
  98                                        struct udl_drm_connector,
  99                                        connector);
 100
 101        drm_connector_cleanup(connector);
 102        kfree(udl_connector->edid);
 103        kfree(connector);
 104}
 105
 106static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
 107        .get_modes = udl_get_modes,
 108        .mode_valid = udl_mode_valid,
 109};
 110
 111static const struct drm_connector_funcs udl_connector_funcs = {
 112        .reset = drm_atomic_helper_connector_reset,
 113        .detect = udl_detect,
 114        .fill_modes = drm_helper_probe_single_connector_modes,
 115        .destroy = udl_connector_destroy,
 116        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 117        .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
 118};
 119
 120struct drm_connector *udl_connector_init(struct drm_device *dev)
 121{
 122        struct udl_drm_connector *udl_connector;
 123        struct drm_connector *connector;
 124
 125        udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
 126        if (!udl_connector)
 127                return ERR_PTR(-ENOMEM);
 128
 129        connector = &udl_connector->connector;
 130        drm_connector_init(dev, connector, &udl_connector_funcs,
 131                           DRM_MODE_CONNECTOR_DVII);
 132        drm_connector_helper_add(connector, &udl_connector_helper_funcs);
 133
 134        connector->polled = DRM_CONNECTOR_POLL_HPD |
 135                DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 136
 137        return connector;
 138}
 139