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_crtc_helper.h>
11 #include <drm/drm_probe_helper.h>
12
13 #include "udl_connector.h"
14 #include "udl_drv.h"
15
udl_get_edid_block(void * data,u8 * buf,unsigned int block,size_t len)16 static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
17 size_t len)
18 {
19 int ret, i;
20 u8 *read_buff;
21 struct udl_device *udl = data;
22
23 read_buff = kmalloc(2, GFP_KERNEL);
24 if (!read_buff)
25 return -1;
26
27 for (i = 0; i < len; i++) {
28 int bval = (i + block * EDID_LENGTH) << 8;
29 ret = usb_control_msg(udl->udev,
30 usb_rcvctrlpipe(udl->udev, 0),
31 (0x02), (0x80 | (0x02 << 5)), bval,
32 0xA1, read_buff, 2, HZ);
33 if (ret < 1) {
34 DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
35 kfree(read_buff);
36 return -1;
37 }
38 buf[i] = read_buff[1];
39 }
40
41 kfree(read_buff);
42 return 0;
43 }
44
udl_get_modes(struct drm_connector * connector)45 static int udl_get_modes(struct drm_connector *connector)
46 {
47 struct udl_drm_connector *udl_connector =
48 container_of(connector,
49 struct udl_drm_connector,
50 connector);
51
52 drm_connector_update_edid_property(connector, udl_connector->edid);
53 if (udl_connector->edid)
54 return drm_add_edid_modes(connector, udl_connector->edid);
55 return 0;
56 }
57
udl_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)58 static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
59 struct drm_display_mode *mode)
60 {
61 struct udl_device *udl = connector->dev->dev_private;
62 if (!udl->sku_pixel_limit)
63 return 0;
64
65 if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
66 return MODE_VIRTUAL_Y;
67
68 return 0;
69 }
70
71 static enum drm_connector_status
udl_detect(struct drm_connector * connector,bool force)72 udl_detect(struct drm_connector *connector, bool force)
73 {
74 struct udl_device *udl = connector->dev->dev_private;
75 struct udl_drm_connector *udl_connector =
76 container_of(connector,
77 struct udl_drm_connector,
78 connector);
79
80 /* cleanup previous edid */
81 if (udl_connector->edid != NULL) {
82 kfree(udl_connector->edid);
83 udl_connector->edid = NULL;
84 }
85
86 udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
87 if (!udl_connector->edid)
88 return connector_status_disconnected;
89
90 return connector_status_connected;
91 }
92
93 static struct drm_encoder*
udl_best_single_encoder(struct drm_connector * connector)94 udl_best_single_encoder(struct drm_connector *connector)
95 {
96 int enc_id = connector->encoder_ids[0];
97 return drm_encoder_find(connector->dev, NULL, enc_id);
98 }
99
udl_connector_set_property(struct drm_connector * connector,struct drm_property * property,uint64_t val)100 static int udl_connector_set_property(struct drm_connector *connector,
101 struct drm_property *property,
102 uint64_t val)
103 {
104 return 0;
105 }
106
udl_connector_destroy(struct drm_connector * connector)107 static void udl_connector_destroy(struct drm_connector *connector)
108 {
109 struct udl_drm_connector *udl_connector =
110 container_of(connector,
111 struct udl_drm_connector,
112 connector);
113
114 drm_connector_unregister(connector);
115 drm_connector_cleanup(connector);
116 kfree(udl_connector->edid);
117 kfree(connector);
118 }
119
120 static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
121 .get_modes = udl_get_modes,
122 .mode_valid = udl_mode_valid,
123 .best_encoder = udl_best_single_encoder,
124 };
125
126 static const struct drm_connector_funcs udl_connector_funcs = {
127 .dpms = drm_helper_connector_dpms,
128 .detect = udl_detect,
129 .fill_modes = drm_helper_probe_single_connector_modes,
130 .destroy = udl_connector_destroy,
131 .set_property = udl_connector_set_property,
132 };
133
udl_connector_init(struct drm_device * dev,struct drm_encoder * encoder)134 int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
135 {
136 struct udl_drm_connector *udl_connector;
137 struct drm_connector *connector;
138
139 udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
140 if (!udl_connector)
141 return -ENOMEM;
142
143 connector = &udl_connector->connector;
144 drm_connector_init(dev, connector, &udl_connector_funcs,
145 DRM_MODE_CONNECTOR_DVII);
146 drm_connector_helper_add(connector, &udl_connector_helper_funcs);
147
148 drm_connector_register(connector);
149 drm_connector_attach_encoder(connector, encoder);
150 connector->polled = DRM_CONNECTOR_POLL_HPD |
151 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
152
153 return 0;
154 }
155
