Free Electrons

Embedded Linux Experts

  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
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
/*
 * hdmi_panel.c
 *
 * HDMI library support functions for TI OMAP4 processors.
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
 * Authors:	Mythri P k <mythripk@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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <video/omapdss.h>
#include <linux/slab.h>

#include "dss.h"

static struct {
	/* This protects the panel ops, mainly when accessing the HDMI IP. */
	struct mutex lock;
#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
	/* This protects the audio ops, specifically. */
	spinlock_t audio_lock;
#endif
} hdmi;


static int hdmi_panel_probe(struct omap_dss_device *dssdev)
{
	/* Initialize default timings to VGA in DVI mode */
	const struct omap_video_timings default_timings = {
		.x_res		= 640,
		.y_res		= 480,
		.pixel_clock	= 25175,
		.hsw		= 96,
		.hfp		= 16,
		.hbp		= 48,
		.vsw		= 2,
		.vfp		= 11,
		.vbp		= 31,

		.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
		.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,

		.interlace	= false,
	};

	DSSDBG("ENTER hdmi_panel_probe\n");

	dssdev->panel.timings = default_timings;

	DSSDBG("hdmi_panel_probe x_res= %d y_res = %d\n",
		dssdev->panel.timings.x_res,
		dssdev->panel.timings.y_res);

	omapdss_hdmi_display_set_timing(dssdev, &dssdev->panel.timings);

	return 0;
}

static void hdmi_panel_remove(struct omap_dss_device *dssdev)
{

}

#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
static int hdmi_panel_audio_enable(struct omap_dss_device *dssdev)
{
	unsigned long flags;
	int r;

	mutex_lock(&hdmi.lock);
	spin_lock_irqsave(&hdmi.audio_lock, flags);

	/* enable audio only if the display is active and supports audio */
	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE ||
	    !hdmi_mode_has_audio()) {
		DSSERR("audio not supported or display is off\n");
		r = -EPERM;
		goto err;
	}

	r = hdmi_audio_enable();

	if (!r)
		dssdev->audio_state = OMAP_DSS_AUDIO_ENABLED;

err:
	spin_unlock_irqrestore(&hdmi.audio_lock, flags);
	mutex_unlock(&hdmi.lock);
	return r;
}

static void hdmi_panel_audio_disable(struct omap_dss_device *dssdev)
{
	unsigned long flags;

	spin_lock_irqsave(&hdmi.audio_lock, flags);

	hdmi_audio_disable();

	dssdev->audio_state = OMAP_DSS_AUDIO_DISABLED;

	spin_unlock_irqrestore(&hdmi.audio_lock, flags);
}

static int hdmi_panel_audio_start(struct omap_dss_device *dssdev)
{
	unsigned long flags;
	int r;

	spin_lock_irqsave(&hdmi.audio_lock, flags);
	/*
	 * No need to check the panel state. It was checked when trasitioning
	 * to AUDIO_ENABLED.
	 */
	if (dssdev->audio_state != OMAP_DSS_AUDIO_ENABLED) {
		DSSERR("audio start from invalid state\n");
		r = -EPERM;
		goto err;
	}

	r = hdmi_audio_start();

	if (!r)
		dssdev->audio_state = OMAP_DSS_AUDIO_PLAYING;

err:
	spin_unlock_irqrestore(&hdmi.audio_lock, flags);
	return r;
}

static void hdmi_panel_audio_stop(struct omap_dss_device *dssdev)
{
	unsigned long flags;

	spin_lock_irqsave(&hdmi.audio_lock, flags);

	hdmi_audio_stop();
	dssdev->audio_state = OMAP_DSS_AUDIO_ENABLED;

	spin_unlock_irqrestore(&hdmi.audio_lock, flags);
}

static bool hdmi_panel_audio_supported(struct omap_dss_device *dssdev)
{
	bool r = false;

	mutex_lock(&hdmi.lock);

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
		goto err;

	if (!hdmi_mode_has_audio())
		goto err;

	r = true;
err:
	mutex_unlock(&hdmi.lock);
	return r;
}

static int hdmi_panel_audio_config(struct omap_dss_device *dssdev,
		struct omap_dss_audio *audio)
{
	unsigned long flags;
	int r;

	mutex_lock(&hdmi.lock);
	spin_lock_irqsave(&hdmi.audio_lock, flags);

	/* config audio only if the display is active and supports audio */
	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE ||
	    !hdmi_mode_has_audio()) {
		DSSERR("audio not supported or display is off\n");
		r = -EPERM;
		goto err;
	}

	r = hdmi_audio_config(audio);

	if (!r)
		dssdev->audio_state = OMAP_DSS_AUDIO_CONFIGURED;

err:
	spin_unlock_irqrestore(&hdmi.audio_lock, flags);
	mutex_unlock(&hdmi.lock);
	return r;
}

#else
static int hdmi_panel_audio_enable(struct omap_dss_device *dssdev)
{
	return -EPERM;
}

static void hdmi_panel_audio_disable(struct omap_dss_device *dssdev)
{
}

static int hdmi_panel_audio_start(struct omap_dss_device *dssdev)
{
	return -EPERM;
}

static void hdmi_panel_audio_stop(struct omap_dss_device *dssdev)
{
}

static bool hdmi_panel_audio_supported(struct omap_dss_device *dssdev)
{
	return false;
}

static int hdmi_panel_audio_config(struct omap_dss_device *dssdev,
		struct omap_dss_audio *audio)
{
	return -EPERM;
}
#endif

static int hdmi_panel_enable(struct omap_dss_device *dssdev)
{
	int r = 0;
	DSSDBG("ENTER hdmi_panel_enable\n");

	mutex_lock(&hdmi.lock);

	if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
		r = -EINVAL;
		goto err;
	}

	omapdss_hdmi_display_set_timing(dssdev, &dssdev->panel.timings);

	r = omapdss_hdmi_display_enable(dssdev);
	if (r) {
		DSSERR("failed to power on\n");
		goto err;
	}

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

err:
	mutex_unlock(&hdmi.lock);

	return r;
}

static void hdmi_panel_disable(struct omap_dss_device *dssdev)
{
	mutex_lock(&hdmi.lock);

	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
		/*
		 * TODO: notify audio users that the display was disabled. For
		 * now, disable audio locally to not break our audio state
		 * machine.
		 */
		hdmi_panel_audio_disable(dssdev);
		omapdss_hdmi_display_disable(dssdev);
	}

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;

	mutex_unlock(&hdmi.lock);
}

static void hdmi_get_timings(struct omap_dss_device *dssdev,
			struct omap_video_timings *timings)
{
	mutex_lock(&hdmi.lock);

	*timings = dssdev->panel.timings;

	mutex_unlock(&hdmi.lock);
}

static void hdmi_set_timings(struct omap_dss_device *dssdev,
			struct omap_video_timings *timings)
{
	DSSDBG("hdmi_set_timings\n");

	mutex_lock(&hdmi.lock);

	/*
	 * TODO: notify audio users that there was a timings change. For
	 * now, disable audio locally to not break our audio state machine.
	 */
	hdmi_panel_audio_disable(dssdev);

	omapdss_hdmi_display_set_timing(dssdev, timings);
	dssdev->panel.timings = *timings;

	mutex_unlock(&hdmi.lock);
}

static int hdmi_check_timings(struct omap_dss_device *dssdev,
			struct omap_video_timings *timings)
{
	int r = 0;

	DSSDBG("hdmi_check_timings\n");

	mutex_lock(&hdmi.lock);

	r = omapdss_hdmi_display_check_timing(dssdev, timings);

	mutex_unlock(&hdmi.lock);
	return r;
}

static int hdmi_read_edid(struct omap_dss_device *dssdev, u8 *buf, int len)
{
	int r;
	bool need_enable;

	mutex_lock(&hdmi.lock);

	need_enable = dssdev->state == OMAP_DSS_DISPLAY_DISABLED;

	if (need_enable) {
		r = omapdss_hdmi_core_enable(dssdev);
		if (r)
			goto err;
	}

	r = omapdss_hdmi_read_edid(buf, len);

	if (need_enable)
		omapdss_hdmi_core_disable(dssdev);
err:
	mutex_unlock(&hdmi.lock);

	return r;
}

static bool hdmi_detect(struct omap_dss_device *dssdev)
{
	int r;
	bool need_enable;

	mutex_lock(&hdmi.lock);

	need_enable = dssdev->state == OMAP_DSS_DISPLAY_DISABLED;

	if (need_enable) {
		r = omapdss_hdmi_core_enable(dssdev);
		if (r)
			goto err;
	}

	r = omapdss_hdmi_detect();

	if (need_enable)
		omapdss_hdmi_core_disable(dssdev);
err:
	mutex_unlock(&hdmi.lock);

	return r;
}

static struct omap_dss_driver hdmi_driver = {
	.probe		= hdmi_panel_probe,
	.remove		= hdmi_panel_remove,
	.enable		= hdmi_panel_enable,
	.disable	= hdmi_panel_disable,
	.get_timings	= hdmi_get_timings,
	.set_timings	= hdmi_set_timings,
	.check_timings	= hdmi_check_timings,
	.read_edid	= hdmi_read_edid,
	.detect		= hdmi_detect,
	.audio_enable	= hdmi_panel_audio_enable,
	.audio_disable	= hdmi_panel_audio_disable,
	.audio_start	= hdmi_panel_audio_start,
	.audio_stop	= hdmi_panel_audio_stop,
	.audio_supported	= hdmi_panel_audio_supported,
	.audio_config	= hdmi_panel_audio_config,
	.driver			= {
		.name   = "hdmi_panel",
		.owner  = THIS_MODULE,
	},
};

int hdmi_panel_init(void)
{
	mutex_init(&hdmi.lock);

#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
	spin_lock_init(&hdmi.audio_lock);
#endif

	return omap_dss_register_driver(&hdmi_driver);
}

void hdmi_panel_exit(void)
{
	omap_dss_unregister_driver(&hdmi_driver);

}