tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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->ddev->usbdev,
38 usb_rcvctrlpipe(udl->ddev->usbdev, 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
65 /*
66 * We only read the main block, but if the monitor reports extension
67 * blocks then the drm edid code expects them to be present, so patch
68 * the extension count to 0.
69 */
70 edid->checksum += edid->extensions;
71 edid->extensions = 0;
72
73 drm_mode_connector_update_edid_property(connector, edid);
74 ret = drm_add_edid_modes(connector, edid);
75 kfree(edid);
76 return ret;
77}
78
79static int udl_mode_valid(struct drm_connector *connector,
80 struct drm_display_mode *mode)
81{
82 struct udl_device *udl = connector->dev->dev_private;
83 if (!udl->sku_pixel_limit)
84 return 0;
85
86 if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
87 return MODE_VIRTUAL_Y;
88
89 return 0;
90}
91
92static enum drm_connector_status
93udl_detect(struct drm_connector *connector, bool force)
94{
95 if (drm_device_is_unplugged(connector->dev))
96 return connector_status_disconnected;
97 return connector_status_connected;
98}
99
100static struct drm_encoder*
101udl_best_single_encoder(struct drm_connector *connector)
102{
103 int enc_id = connector->encoder_ids[0];
104 struct drm_mode_object *obj;
105 struct drm_encoder *encoder;
106
107 obj = drm_mode_object_find(connector->dev, enc_id, DRM_MODE_OBJECT_ENCODER);
108 if (!obj)
109 return NULL;
110 encoder = obj_to_encoder(obj);
111 return encoder;
112}
113
114static int udl_connector_set_property(struct drm_connector *connector,
115 struct drm_property *property,
116 uint64_t val)
117{
118 return 0;
119}
120
121static void udl_connector_destroy(struct drm_connector *connector)
122{
123 drm_sysfs_connector_remove(connector);
124 drm_connector_cleanup(connector);
125 kfree(connector);
126}
127
128static struct drm_connector_helper_funcs udl_connector_helper_funcs = {
129 .get_modes = udl_get_modes,
130 .mode_valid = udl_mode_valid,
131 .best_encoder = udl_best_single_encoder,
132};
133
134static struct drm_connector_funcs udl_connector_funcs = {
135 .dpms = drm_helper_connector_dpms,
136 .detect = udl_detect,
137 .fill_modes = drm_helper_probe_single_connector_modes,
138 .destroy = udl_connector_destroy,
139 .set_property = udl_connector_set_property,
140};
141
142int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
143{
144 struct drm_connector *connector;
145
146 connector = kzalloc(sizeof(struct drm_connector), GFP_KERNEL);
147 if (!connector)
148 return -ENOMEM;
149
150 drm_connector_init(dev, connector, &udl_connector_funcs, DRM_MODE_CONNECTOR_DVII);
151 drm_connector_helper_add(connector, &udl_connector_helper_funcs);
152
153 drm_sysfs_connector_add(connector);
154 drm_mode_connector_attach_encoder(connector, encoder);
155
156 drm_object_attach_property(&connector->base,
157 dev->mode_config.dirty_info_property,
158 1);
159 return 0;
160}