summaryrefslogtreecommitdiff
path: root/drivers/video/fbdev/omap2/displays-new/encoder-tpd12s015.c
blob: c7a3ce2c5120632133985f997cbd8da18e3540d2 (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
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
415
416
417
/*
 * TPD12S015 HDMI ESD protection & level shifter chip 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/completion.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/of_gpio.h>

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

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

	int ct_cp_hpd_gpio;
	int ls_oe_gpio;
	int hpd_gpio;

	struct omap_video_timings timings;

	struct completion hpd_completion;
};

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

static irqreturn_t tpd_hpd_irq_handler(int irq, void *data)
{
	struct panel_drv_data *ddata = data;
	bool hpd;

	hpd = gpio_get_value_cansleep(ddata->hpd_gpio);

	dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd);

	if (gpio_is_valid(ddata->ls_oe_gpio)) {
		if (hpd)
			gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
		else
			gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
	}

	complete_all(&ddata->hpd_completion);

	return IRQ_HANDLED;
}

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

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

	dst->src = dssdev;
	dssdev->dst = dst;

	reinit_completion(&ddata->hpd_completion);

	gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
	/* DC-DC converter needs at max 300us to get to 90% of 5V */
	udelay(300);

	/*
	 * If there's a cable connected, wait for the hpd irq to trigger,
	 * which turns on the level shifters.
	 */
	if (gpio_get_value_cansleep(ddata->hpd_gpio)) {
		unsigned long to;
		to = wait_for_completion_timeout(&ddata->hpd_completion,
				msecs_to_jiffies(250));
		WARN_ON_ONCE(to == 0);
	}

	return 0;
}

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

	WARN_ON(dst != dssdev->dst);

	if (dst != dssdev->dst)
		return;

	gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);

	dst->src = NULL;
	dssdev->dst = NULL;

	in->ops.hdmi->disconnect(in, &ddata->dssdev);
}

static int tpd_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 (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
		return 0;

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

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

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return r;
}

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

	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
		return;

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

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void tpd_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.hdmi->set_timings(in, timings);
}

static void tpd_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 tpd_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;
	int r;

	r = in->ops.hdmi->check_timings(in, timings);

	return r;
}

static int tpd_read_edid(struct omap_dss_device *dssdev,
		u8 *edid, int len)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	if (!gpio_get_value_cansleep(ddata->hpd_gpio))
		return -ENODEV;

	return in->ops.hdmi->read_edid(in, edid, len);
}

static bool tpd_detect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);

	return gpio_get_value_cansleep(ddata->hpd_gpio);
}

static int tpd_set_infoframe(struct omap_dss_device *dssdev,
		const struct hdmi_avi_infoframe *avi)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	return in->ops.hdmi->set_infoframe(in, avi);
}

static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
		bool hdmi_mode)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
}

static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
	.connect		= tpd_connect,
	.disconnect		= tpd_disconnect,

	.enable			= tpd_enable,
	.disable		= tpd_disable,

	.check_timings		= tpd_check_timings,
	.set_timings		= tpd_set_timings,
	.get_timings		= tpd_get_timings,

	.read_edid		= tpd_read_edid,
	.detect			= tpd_detect,
	.set_infoframe		= tpd_set_infoframe,
	.set_hdmi_mode		= tpd_set_hdmi_mode,
};

static int tpd_probe_pdata(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct encoder_tpd12s015_platform_data *pdata;
	struct omap_dss_device *dssdev, *in;

	pdata = dev_get_platdata(&pdev->dev);

	ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
	ddata->ls_oe_gpio = pdata->ls_oe_gpio;
	ddata->hpd_gpio = pdata->hpd_gpio;

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

	ddata->in = in;

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

	return 0;
}

static int tpd_probe_of(struct platform_device *pdev)
{
	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	struct device_node *node = pdev->dev.of_node;
	struct omap_dss_device *in;
	int gpio;

	/* CT CP HPD GPIO */
	gpio = of_get_gpio(node, 0);
	if (!gpio_is_valid(gpio)) {
		dev_err(&pdev->dev, "failed to parse CT CP HPD gpio\n");
		return gpio;
	}
	ddata->ct_cp_hpd_gpio = gpio;

	/* LS OE GPIO */
	gpio = of_get_gpio(node, 1);
	if (gpio_is_valid(gpio) || gpio == -ENOENT) {
		ddata->ls_oe_gpio = gpio;
	} else {
		dev_err(&pdev->dev, "failed to parse LS OE gpio\n");
		return gpio;
	}

	/* HPD GPIO */
	gpio = of_get_gpio(node, 2);
	if (!gpio_is_valid(gpio)) {
		dev_err(&pdev->dev, "failed to parse HPD gpio\n");
		return gpio;
	}
	ddata->hpd_gpio = gpio;

	in = omapdss_of_find_source_for_first_ep(node);
	if (IS_ERR(in)) {
		dev_err(&pdev->dev, "failed to find video source\n");
		return PTR_ERR(in);
	}

	ddata->in = in;

	return 0;
}

static int tpd_probe(struct platform_device *pdev)
{
	struct omap_dss_device *in, *dssdev;
	struct panel_drv_data *ddata;
	int r;

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

	platform_set_drvdata(pdev, ddata);

	init_completion(&ddata->hpd_completion);

	if (dev_get_platdata(&pdev->dev)) {
		r = tpd_probe_pdata(pdev);
		if (r)
			return r;
	} else if (pdev->dev.of_node) {
		r = tpd_probe_of(pdev);
		if (r)
			return r;
	} else {
		return -ENODEV;
	}

	r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
			GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
	if (r)
		goto err_gpio;

	if (gpio_is_valid(ddata->ls_oe_gpio)) {
		r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
				GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
		if (r)
			goto err_gpio;
	}

	r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
			GPIOF_DIR_IN, "hdmi_hpd");
	if (r)
		goto err_gpio;

	r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio),
				 NULL, tpd_hpd_irq_handler,
				 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
				 IRQF_ONESHOT, "hpd", ddata);
	if (r)
		goto err_irq;

	dssdev = &ddata->dssdev;
	dssdev->ops.hdmi = &tpd_hdmi_ops;
	dssdev->dev = &pdev->dev;
	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
	dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
	dssdev->owner = THIS_MODULE;
	dssdev->port_num = 1;

	in = ddata->in;

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

	return 0;
err_reg:
err_irq:
err_gpio:
	omap_dss_put_device(ddata->in);
	return r;
}

static int __exit tpd_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_output(&ddata->dssdev);

	WARN_ON(omapdss_device_is_enabled(dssdev));
	if (omapdss_device_is_enabled(dssdev))
		tpd_disable(dssdev);

	WARN_ON(omapdss_device_is_connected(dssdev));
	if (omapdss_device_is_connected(dssdev))
		tpd_disconnect(dssdev, dssdev->dst);

	omap_dss_put_device(in);

	return 0;
}

static const struct of_device_id tpd_of_match[] = {
	{ .compatible = "omapdss,ti,tpd12s015", },
	{},
};

MODULE_DEVICE_TABLE(of, tpd_of_match);

static struct platform_driver tpd_driver = {
	.probe	= tpd_probe,
	.remove	= __exit_p(tpd_remove),
	.driver	= {
		.name	= "tpd12s015",
		.owner	= THIS_MODULE,
		.of_match_table = tpd_of_match,
		.suppress_bind_attrs = true,
	},
};

module_platform_driver(tpd_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TPD12S015 driver");
MODULE_LICENSE("GPL");