summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/udl/udl_connector.c
blob: b44d548c56f8e43a3e14878622c8f8ed3507bf35 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/*
 * Copyright (C) 2012 Red Hat
 * based in parts on udlfb.c:
 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License v2. See the file COPYING in the main directory of this archive for
 * more details.
 */

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/drm_crtc_helper.h>
#include "udl_drv.h"

/* dummy connector to just get EDID,
   all UDL appear to have a DVI-D */

static u8 *udl_get_edid(struct udl_device *udl)
{
	u8 *block;
	char *rbuf;
	int ret, i;

	block = kmalloc(EDID_LENGTH, GFP_KERNEL);
	if (block == NULL)
		return NULL;

	rbuf = kmalloc(2, GFP_KERNEL);
	if (rbuf == NULL)
		goto error;

	for (i = 0; i < EDID_LENGTH; i++) {
		ret = usb_control_msg(udl->ddev->usbdev,
				      usb_rcvctrlpipe(udl->ddev->usbdev, 0), (0x02),
				      (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
				      HZ);
		if (ret < 1) {
			DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
			goto error;
		}
		block[i] = rbuf[1];
	}

	kfree(rbuf);
	return block;

error:
	kfree(block);
	kfree(rbuf);
	return NULL;
}

static int udl_get_modes(struct drm_connector *connector)
{
	struct udl_device *udl = connector->dev->dev_private;
	struct edid *edid;
	int ret;

	edid = (struct edid *)udl_get_edid(udl);
	if (!edid) {
		drm_mode_connector_update_edid_property(connector, NULL);
		return 0;
	}

	/*
	 * We only read the main block, but if the monitor reports extension
	 * blocks then the drm edid code expects them to be present, so patch
	 * the extension count to 0.
	 */
	edid->checksum += edid->extensions;
	edid->extensions = 0;

	drm_mode_connector_update_edid_property(connector, edid);
	ret = drm_add_edid_modes(connector, edid);
	kfree(edid);
	return ret;
}

static int udl_mode_valid(struct drm_connector *connector,
			  struct drm_display_mode *mode)
{
	struct udl_device *udl = connector->dev->dev_private;
	if (!udl->sku_pixel_limit)
		return 0;

	if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
		return MODE_VIRTUAL_Y;

	return 0;
}

static enum drm_connector_status
udl_detect(struct drm_connector *connector, bool force)
{
	if (drm_device_is_unplugged(connector->dev))
		return connector_status_disconnected;
	return connector_status_connected;
}

static struct drm_encoder*
udl_best_single_encoder(struct drm_connector *connector)
{
	int enc_id = connector->encoder_ids[0];
	struct drm_mode_object *obj;
	struct drm_encoder *encoder;

	obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
	if (!obj)
		return NULL;
	encoder = obj_to_encoder(obj);
	return encoder;
}

static int udl_connector_set_property(struct drm_connector *connector,
				      struct drm_property *property,
				      uint64_t val)
{
	return 0;
}

static void udl_connector_destroy(struct drm_connector *connector)
{
	drm_sysfs_connector_remove(connector);
	drm_connector_cleanup(connector);
	kfree(connector);
}

static struct drm_connector_helper_funcs udl_connector_helper_funcs = {
	.get_modes = udl_get_modes,
	.mode_valid = udl_mode_valid,
	.best_encoder = udl_best_single_encoder,
};

static struct drm_connector_funcs udl_connector_funcs = {
	.dpms = drm_helper_connector_dpms,
	.detect = udl_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = udl_connector_destroy,
	.set_property = udl_connector_set_property,
};

int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
{
	struct drm_connector *connector;

	connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
	if (!connector)
		return -ENOMEM;

	drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
	drm_connector_helper_add(connector, &udl_connector_helper_funcs);

	drm_sysfs_connector_add(connector);
	drm_mode_connector_attach_encoder(connector, encoder);

	drm_object_attach_property(&connector->base,
				      dev->mode_config.dirty_info_property,
				      1);
	return 0;
}