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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_connector.h"
18#include "udl_drv.h"
19
20static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
21 u8 *buff)
22{
23 int ret, i;
24 u8 *read_buff;
25
26 read_buff = kmalloc(2, GFP_KERNEL);
27 if (!read_buff)
28 return false;
29
30 for (i = 0; i < EDID_LENGTH; i++) {
31 int bval = (i + block_idx * EDID_LENGTH) << 8;
32 ret = usb_control_msg(udl->udev,
33 usb_rcvctrlpipe(udl->udev, 0),
34 (0x02), (0x80 | (0x02 << 5)), bval,
35 0xA1, read_buff, 2, HZ);
36 if (ret < 1) {
37 DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
38 kfree(read_buff);
39 return false;
40 }
41 buff[i] = read_buff[1];
42 }
43
44 kfree(read_buff);
45 return true;
46}
47
48static bool udl_get_edid(struct udl_device *udl, u8 **result_buff,
49 int *result_buff_size)
50{
51 int i, extensions;
52 u8 *block_buff = NULL, *buff_ptr;
53
54 block_buff = kmalloc(EDID_LENGTH, GFP_KERNEL);
55 if (block_buff == NULL)
56 return false;
57
58 if (udl_get_edid_block(udl, 0, block_buff) &&
59 memchr_inv(block_buff, 0, EDID_LENGTH)) {
60 extensions = ((struct edid *)block_buff)->extensions;
61 if (extensions > 0) {
62
63 *result_buff_size = EDID_LENGTH * (extensions + 1);
64 *result_buff = kmalloc(*result_buff_size, GFP_KERNEL);
65 buff_ptr = *result_buff;
66 if (buff_ptr == NULL) {
67 kfree(block_buff);
68 return false;
69 }
70 memcpy(buff_ptr, block_buff, EDID_LENGTH);
71 kfree(block_buff);
72 buff_ptr += EDID_LENGTH;
73 for (i = 1; i < extensions; ++i) {
74 if (udl_get_edid_block(udl, i, buff_ptr)) {
75 buff_ptr += EDID_LENGTH;
76 } else {
77 kfree(*result_buff);
78 *result_buff = NULL;
79 return false;
80 }
81 }
82 return true;
83 }
84
85 *result_buff = block_buff;
86 *result_buff_size = EDID_LENGTH;
87 return true;
88 }
89
90 kfree(block_buff);
91
92 return false;
93}
94
95static int udl_get_modes(struct drm_connector *connector)
96{
97 struct udl_drm_connector *udl_connector =
98 container_of(connector,
99 struct udl_drm_connector,
100 connector);
101
102 drm_mode_connector_update_edid_property(connector, udl_connector->edid);
103 if (udl_connector->edid)
104 return drm_add_edid_modes(connector, udl_connector->edid);
105 return 0;
106}
107
108static int udl_mode_valid(struct drm_connector *connector,
109 struct drm_display_mode *mode)
110{
111 struct udl_device *udl = connector->dev->dev_private;
112 if (!udl->sku_pixel_limit)
113 return 0;
114
115 if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
116 return MODE_VIRTUAL_Y;
117
118 return 0;
119}
120
121static enum drm_connector_status
122udl_detect(struct drm_connector *connector, bool force)
123{
124 u8 *edid_buff = NULL;
125 int edid_buff_size = 0;
126 struct udl_device *udl = connector->dev->dev_private;
127 struct udl_drm_connector *udl_connector =
128 container_of(connector,
129 struct udl_drm_connector,
130 connector);
131
132
133 if (udl_connector->edid != NULL) {
134 kfree(udl_connector->edid);
135 udl_connector->edid = NULL;
136 }
137
138
139 if (!udl_get_edid(udl, &edid_buff, &edid_buff_size))
140 return connector_status_disconnected;
141
142 udl_connector->edid = (struct edid *)edid_buff;
143
144 return connector_status_connected;
145}
146
147static struct drm_encoder*
148udl_best_single_encoder(struct drm_connector *connector)
149{
150 int enc_id = connector->encoder_ids[0];
151 return drm_encoder_find(connector->dev, NULL, enc_id);
152}
153
154static int udl_connector_set_property(struct drm_connector *connector,
155 struct drm_property *property,
156 uint64_t val)
157{
158 return 0;
159}
160
161static void udl_connector_destroy(struct drm_connector *connector)
162{
163 struct udl_drm_connector *udl_connector =
164 container_of(connector,
165 struct udl_drm_connector,
166 connector);
167
168 drm_connector_unregister(connector);
169 drm_connector_cleanup(connector);
170 kfree(udl_connector->edid);
171 kfree(connector);
172}
173
174static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
175 .get_modes = udl_get_modes,
176 .mode_valid = udl_mode_valid,
177 .best_encoder = udl_best_single_encoder,
178};
179
180static const struct drm_connector_funcs udl_connector_funcs = {
181 .dpms = drm_helper_connector_dpms,
182 .detect = udl_detect,
183 .fill_modes = drm_helper_probe_single_connector_modes,
184 .destroy = udl_connector_destroy,
185 .set_property = udl_connector_set_property,
186};
187
188int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
189{
190 struct udl_drm_connector *udl_connector;
191 struct drm_connector *connector;
192
193 udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
194 if (!udl_connector)
195 return -ENOMEM;
196
197 connector = &udl_connector->connector;
198 drm_connector_init(dev, connector, &udl_connector_funcs,
199 DRM_MODE_CONNECTOR_DVII);
200 drm_connector_helper_add(connector, &udl_connector_helper_funcs);
201
202 drm_connector_register(connector);
203 drm_mode_connector_attach_encoder(connector, encoder);
204 connector->polled = DRM_CONNECTOR_POLL_HPD |
205 DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
206
207 return 0;
208}
209
