[go: nahoru, domu]
1/*
2 * Copyright (C) 2012 Red Hat
3 * based in parts on udlfb.c:
4 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
5 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
6 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License v2. See the file COPYING in the main directory of this archive for
10 * more details.
11 */
12
13#include <drm/drmP.h>
14#include <drm/drm_crtc.h>
15#include <drm/drm_edid.h>
16#include <drm/drm_crtc_helper.h>
17#include "udl_drv.h"
18
19/* dummy connector to just get EDID,
20   all UDL appear to have a DVI-D */
21
22static u8 *udl_get_edid(struct udl_device *udl)
23{
24	u8 *block;
25	char *rbuf;
26	int ret, i;
27
28	block = kmalloc(EDID_LENGTH, GFP_KERNEL);
29	if (block == NULL)
30		return NULL;
31
32	rbuf = kmalloc(2, GFP_KERNEL);
33	if (rbuf == NULL)
34		goto error;
35
36	for (i = 0; i < EDID_LENGTH; i++) {
37		ret = usb_control_msg(udl->udev,
38				      usb_rcvctrlpipe(udl->udev, 0), (0x02),
39				      (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
40				      HZ);
41		if (ret < 1) {
42			DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
43			goto error;
44		}
45		block[i] = rbuf[1];
46	}
47
48	kfree(rbuf);
49	return block;
50
51error:
52	kfree(block);
53	kfree(rbuf);
54	return NULL;
55}
56
57static int udl_get_modes(struct drm_connector *connector)
58{
59	struct udl_device *udl = connector->dev->dev_private;
60	struct edid *edid;
61	int ret;
62
63	edid = (struct edid *)udl_get_edid(udl);
64	if (!edid) {
65		drm_mode_connector_update_edid_property(connector, NULL);
66		return 0;
67	}
68
69	/*
70	 * We only read the main block, but if the monitor reports extension
71	 * blocks then the drm edid code expects them to be present, so patch
72	 * the extension count to 0.
73	 */
74	edid->checksum += edid->extensions;
75	edid->extensions = 0;
76
77	drm_mode_connector_update_edid_property(connector, edid);
78	ret = drm_add_edid_modes(connector, edid);
79	kfree(edid);
80	return ret;
81}
82
83static int udl_mode_valid(struct drm_connector *connector,
84			  struct drm_display_mode *mode)
85{
86	struct udl_device *udl = connector->dev->dev_private;
87	if (!udl->sku_pixel_limit)
88		return 0;
89
90	if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
91		return MODE_VIRTUAL_Y;
92
93	return 0;
94}
95
96static enum drm_connector_status
97udl_detect(struct drm_connector *connector, bool force)
98{
99	if (drm_device_is_unplugged(connector->dev))
100		return connector_status_disconnected;
101	return connector_status_connected;
102}
103
104static struct drm_encoder*
105udl_best_single_encoder(struct drm_connector *connector)
106{
107	int enc_id = connector->encoder_ids[0];
108	return drm_encoder_find(connector->dev, enc_id);
109}
110
111static int udl_connector_set_property(struct drm_connector *connector,
112				      struct drm_property *property,
113				      uint64_t val)
114{
115	return 0;
116}
117
118static void udl_connector_destroy(struct drm_connector *connector)
119{
120	drm_connector_unregister(connector);
121	drm_connector_cleanup(connector);
122	kfree(connector);
123}
124
125static struct drm_connector_helper_funcs udl_connector_helper_funcs = {
126	.get_modes = udl_get_modes,
127	.mode_valid = udl_mode_valid,
128	.best_encoder = udl_best_single_encoder,
129};
130
131static struct drm_connector_funcs udl_connector_funcs = {
132	.dpms = drm_helper_connector_dpms,
133	.detect = udl_detect,
134	.fill_modes = drm_helper_probe_single_connector_modes,
135	.destroy = udl_connector_destroy,
136	.set_property = udl_connector_set_property,
137};
138
139int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
140{
141	struct drm_connector *connector;
142
143	connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
144	if (!connector)
145		return -ENOMEM;
146
147	drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
148	drm_connector_helper_add(connector, &udl_connector_helper_funcs);
149
150	drm_connector_register(connector);
151	drm_mode_connector_attach_encoder(connector, encoder);
152
153	drm_object_attach_property(&connector->base,
154				      dev->mode_config.dirty_info_property,
155				      1);
156	return 0;
157}
158