tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/drmP.h>
11#include <drm/drm_crtc.h>
12#include <drm/drm_edid.h>
13#include <drm/drm_crtc_helper.h>
14#include <drm/drm_probe_helper.h>
15#include "udl_connector.h"
16#include "udl_drv.h"
17
18static 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
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(udl->udev,
32 usb_rcvctrlpipe(udl->udev, 0),
33 (0x02), (0x80 | (0x02 << 5)), bval,
34 0xA1, read_buff, 2, HZ);
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
47static 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
60static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
61 struct drm_display_mode *mode)
62{
63 struct udl_device *udl = connector->dev->dev_private;
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
73static enum drm_connector_status
74udl_detect(struct drm_connector *connector, bool force)
75{
76 struct udl_device *udl = connector->dev->dev_private;
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
95static struct drm_encoder*
96udl_best_single_encoder(struct drm_connector *connector)
97{
98 int enc_id = connector->encoder_ids[0];
99 return drm_encoder_find(connector->dev, NULL, enc_id);
100}
101
102static int udl_connector_set_property(struct drm_connector *connector,
103 struct drm_property *property,
104 uint64_t val)
105{
106 return 0;
107}
108
109static void udl_connector_destroy(struct drm_connector *connector)
110{
111 struct udl_drm_connector *udl_connector =
112 container_of(connector,
113 struct udl_drm_connector,
114 connector);
115
116 drm_connector_unregister(connector);
117 drm_connector_cleanup(connector);
118 kfree(udl_connector->edid);
119 kfree(connector);
120}
121
122static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
123 .get_modes = udl_get_modes,
124 .mode_valid = udl_mode_valid,
125 .best_encoder = udl_best_single_encoder,
126};
127
128static const struct drm_connector_funcs udl_connector_funcs = {
129 .dpms = drm_helper_connector_dpms,
130 .detect = udl_detect,
131 .fill_modes = drm_helper_probe_single_connector_modes,
132 .destroy = udl_connector_destroy,
133 .set_property = udl_connector_set_property,
134};
135
136int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
137{
138 struct udl_drm_connector *udl_connector;
139 struct drm_connector *connector;
140
141 udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
142 if (!udl_connector)
143 return -ENOMEM;
144
145 connector = &udl_connector->connector;
146 drm_connector_init(dev, connector, &udl_connector_funcs,
147 DRM_MODE_CONNECTOR_DVII);
148 drm_connector_helper_add(connector, &udl_connector_helper_funcs);
149
150 drm_connector_register(connector);
151 drm_connector_attach_encoder(connector, encoder);
152 connector->polled = DRM_CONNECTOR_POLL_HPD |
153 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
154
155 return 0;
156}