summaryrefslogtreecommitdiffstats
path: root/drivers/video/omap2/displays-new/connector-dvi.c
blob: 63d88ee6dfe410469215455795bd4b63b031a040 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 * Generic DVI Connector driver
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <drm/drm_edid.h>

#include <video/omapdss.h>
#include <video/omap-panel-data.h>

static const struct omap_video_timings dvic_default_timings = {
	.x_res		= 640,
	.y_res		= 480,

	.pixel_clock	= 23500,

	.hfp		= 48,
	.hsw		= 32,
	.hbp		= 80,

	.vfp		= 3,
	.vsw		= 4,
	.vbp		= 7,

	.vsync_level	= OMAPDSS_SIG_ACTIVE_HIGH,
	.hsync_level	= OMAPDSS_SIG_ACTIVE_HIGH,
	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
};

struct panel_drv_data {
	struct omap_dss_device dssdev;
	struct omap_dss_device *in;

	struct omap_video_timings timings;

	struct i2c_adapter *i2c_adapter;
};

#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)

static int dvic_connect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;
	int r;

	if (omapdss_device_is_connected(dssdev))
		return 0;

	r = in->ops.dvi->connect(in, dssdev);
	if (r)
		return r;

	return 0;
}

static void dvic_disconnect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	if (!omapdss_device_is_connected(dssdev))
		return;

	in->ops.dvi->disconnect(in, dssdev);
}

static int dvic_enable(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;
	int r;

	if (!omapdss_device_is_connected(dssdev))
		return -ENODEV;

	if (omapdss_device_is_enabled(dssdev))
		return 0;

	in->ops.dvi->set_timings(in, &ddata->timings);

	r = in->ops.dvi->enable(in);
	if (r)
		return r;

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return 0;
}

static void dvic_disable(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	if (!omapdss_device_is_enabled(dssdev))
		return;

	in->ops.dvi->disable(in);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void dvic_set_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	ddata->timings = *timings;
	dssdev->panel.timings = *timings;

	in->ops.dvi->set_timings(in, timings);
}

static void dvic_get_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);

	*timings = ddata->timings;
}

static int dvic_check_timings(struct omap_dss_device *dssdev,
		struct omap_video_timings *timings)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	return in->ops.dvi->check_timings(in, timings);
}

static int dvic_ddc_read(struct i2c_adapter *adapter,
		unsigned char *buf, u16 count, u8 offset)
{
	int r, retries;

	for (retries = 3; retries > 0; retries--) {
		struct i2c_msg msgs[] = {
			{
				.addr   = DDC_ADDR,
				.flags  = 0,
				.len    = 1,
				.buf    = &offset,
			}, {
				.addr   = DDC_ADDR,
				.flags  = I2C_M_RD,
				.len    = count,
				.buf    = buf,
			}
		};

		r = i2c_transfer(adapter, msgs, 2);
		if (r == 2)
			return 0;

		if (r != -EAGAIN)
			break;
	}

	return r < 0 ? r : -EIO;
}

static int dvic_read_edid(struct omap_dss_device *dssdev,
		u8 *edid, int len)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	int r, l, bytes_read;

	if (!ddata->i2c_adapter)
		return -ENODEV;

	l = min(EDID_LENGTH, len);
	r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
	if (r)
		return r;

	bytes_read = l;

	/* if there are extensions, read second block */
	if (len > EDID_LENGTH && edid[0x7e] > 0) {
		l = min(EDID_LENGTH, len - EDID_LENGTH);

		r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
				l, EDID_LENGTH);
		if (r)
			return r;

		bytes_read += l;
	}

	return bytes_read;
}

static bool dvic_detect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	unsigned char out;
	int r;

	if (!ddata->i2c_adapter)
		return true;

	r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);

	return r == 0;
}

static struct omap_dss_driver dvic_driver = {
	.connect	= dvic_connect,
	.disconnect	= dvic_disconnect,

	.enable		= dvic_enable,
	.disable	= dvic_disable,

	.set_timings	= dvic_set_timings,
	.get_timings	= dvic_get_timings,
	.check_timings	= dvic_check_timings,

	.get_resolution	= omapdss_default_get_resolution,

	.read_edid	= dvic_read_edid,
	.detect		= dvic_detect,
};

static int dvic_probe_pdata(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct connector_dvi_platform_data *pdata;
	struct omap_dss_device *in, *dssdev;
	int i2c_bus_num;

	pdata = dev_get_platdata(&pdev->dev);
	i2c_bus_num = pdata->i2c_bus_num;

	if (i2c_bus_num != -1) {
		struct i2c_adapter *adapter;

		adapter = i2c_get_adapter(i2c_bus_num);
		if (!adapter) {
			dev_err(&pdev->dev,
					"Failed to get I2C adapter, bus %d\n",
					i2c_bus_num);
			return -EPROBE_DEFER;
		}

		ddata->i2c_adapter = adapter;
	}

	in = omap_dss_find_output(pdata->source);
	if (in == NULL) {
		dev_err(&pdev->dev, "Failed to find video source\n");
		return -EPROBE_DEFER;
	}

	ddata->in = in;

	dssdev = &ddata->dssdev;
	dssdev->name = pdata->name;

	return 0;
}

static int dvic_probe(struct platform_device *pdev)
{
	struct panel_drv_data *ddata;
	struct omap_dss_device *dssdev;
	int r;

	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	platform_set_drvdata(pdev, ddata);

	if (dev_get_platdata(&pdev->dev)) {
		r = dvic_probe_pdata(pdev);
		if (r)
			return r;
	} else {
		return -ENODEV;
	}

	ddata->timings = dvic_default_timings;

	dssdev = &ddata->dssdev;
	dssdev->driver = &dvic_driver;
	dssdev->dev = &pdev->dev;
	dssdev->type = OMAP_DISPLAY_TYPE_DVI;
	dssdev->owner = THIS_MODULE;
	dssdev->panel.timings = dvic_default_timings;

	r = omapdss_register_display(dssdev);
	if (r) {
		dev_err(&pdev->dev, "Failed to register panel\n");
		goto err_reg;
	}

	return 0;

err_reg:
	omap_dss_put_device(ddata->in);
	return r;
}

static int __exit dvic_remove(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct omap_dss_device *dssdev = &ddata->dssdev;
	struct omap_dss_device *in = ddata->in;

	omapdss_unregister_display(&ddata->dssdev);

	dvic_disable(dssdev);
	dvic_disconnect(dssdev);

	omap_dss_put_device(in);

	if (ddata->i2c_adapter)
		i2c_put_adapter(ddata->i2c_adapter);

	return 0;
}

static struct platform_driver dvi_connector_driver = {
	.probe	= dvic_probe,
	.remove	= __exit_p(dvic_remove),
	.driver	= {
		.name	= "connector-dvi",
		.owner	= THIS_MODULE,
	},
};

module_platform_driver(dvi_connector_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Generic DVI Connector driver");
MODULE_LICENSE("GPL");