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_atomic_state_helper.h>
11#include <drm/drm_crtc_helper.h>
12#include <drm/drm_probe_helper.h>
13
14#include "udl_connector.h"
15#include "udl_drv.h"
16
17static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
18			       size_t len)
19{
20	int ret, i;
21	u8 *read_buff;
22	struct udl_device *udl = data;
23
24	read_buff = kmalloc(2, GFP_KERNEL);
25	if (!read_buff)
26		return -1;
27
28	for (i = 0; i < len; i++) {
29		int bval = (i + block * EDID_LENGTH) << 8;
30		ret = usb_control_msg(udl->udev,
31				      usb_rcvctrlpipe(udl->udev, 0),
32					  (0x02), (0x80 | (0x02 << 5)), bval,
33					  0xA1, read_buff, 2, 1000);
34		if (ret < 1) {
35			DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
36			kfree(read_buff);
37			return -1;
38		}
39		buf[i] = read_buff[1];
40	}
41
42	kfree(read_buff);
43	return 0;
44}
45
46static int udl_get_modes(struct drm_connector *connector)
47{
48	struct udl_drm_connector *udl_connector =
49					container_of(connector,
50					struct udl_drm_connector,
51					connector);
52
53	drm_connector_update_edid_property(connector, udl_connector->edid);
54	if (udl_connector->edid)
55		return drm_add_edid_modes(connector, udl_connector->edid);
56	return 0;
57}
58
59static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
60			  struct drm_display_mode *mode)
61{
62	struct udl_device *udl = to_udl(connector->dev);
63	if (!udl->sku_pixel_limit)
64		return 0;
65
66	if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
67		return MODE_VIRTUAL_Y;
68
69	return 0;
70}
71
72static enum drm_connector_status
73udl_detect(struct drm_connector *connector, bool force)
74{
75	struct udl_device *udl = to_udl(connector->dev);
76	struct udl_drm_connector *udl_connector =
77					container_of(connector,
78					struct udl_drm_connector,
79					connector);
80
81	/* cleanup previous edid */
82	if (udl_connector->edid != NULL) {
83		kfree(udl_connector->edid);
84		udl_connector->edid = NULL;
85	}
86
87	udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
88	if (!udl_connector->edid)
89		return connector_status_disconnected;
90
91	return connector_status_connected;
92}
93
94static void udl_connector_destroy(struct drm_connector *connector)
95{
96	struct udl_drm_connector *udl_connector =
97					container_of(connector,
98					struct udl_drm_connector,
99					connector);
100
101	drm_connector_cleanup(connector);
102	kfree(udl_connector->edid);
103	kfree(connector);
104}
105
106static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
107	.get_modes = udl_get_modes,
108	.mode_valid = udl_mode_valid,
109};
110
111static const struct drm_connector_funcs udl_connector_funcs = {
112	.reset = drm_atomic_helper_connector_reset,
113	.detect = udl_detect,
114	.fill_modes = drm_helper_probe_single_connector_modes,
115	.destroy = udl_connector_destroy,
116	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
117	.atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
118};
119
120struct drm_connector *udl_connector_init(struct drm_device *dev)
121{
122	struct udl_drm_connector *udl_connector;
123	struct drm_connector *connector;
124
125	udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
126	if (!udl_connector)
127		return ERR_PTR(-ENOMEM);
128
129	connector = &udl_connector->connector;
130	drm_connector_init(dev, connector, &udl_connector_funcs,
131			   DRM_MODE_CONNECTOR_DVII);
132	drm_connector_helper_add(connector, &udl_connector_helper_funcs);
133
134	connector->polled = DRM_CONNECTOR_POLL_HPD |
135		DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
136
137	return connector;
138}
139