[go: nahoru, domu]
1/*
2 * TPD12S015 HDMI ESD protection & level shifter chip driver
3 *
4 * Copyright (C) 2013 Texas Instruments
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11
12#include <linux/completion.h>
13#include <linux/delay.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/gpio.h>
17#include <linux/platform_device.h>
18#include <linux/of_gpio.h>
19
20#include <video/omapdss.h>
21#include <video/omap-panel-data.h>
22
23struct panel_drv_data {
24	struct omap_dss_device dssdev;
25	struct omap_dss_device *in;
26
27	int ct_cp_hpd_gpio;
28	int ls_oe_gpio;
29	int hpd_gpio;
30
31	struct omap_video_timings timings;
32
33	struct completion hpd_completion;
34};
35
36#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
37
38static irqreturn_t tpd_hpd_irq_handler(int irq, void *data)
39{
40	struct panel_drv_data *ddata = data;
41	bool hpd;
42
43	hpd = gpio_get_value_cansleep(ddata->hpd_gpio);
44
45	dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd);
46
47	if (gpio_is_valid(ddata->ls_oe_gpio)) {
48		if (hpd)
49			gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
50		else
51			gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
52	}
53
54	complete_all(&ddata->hpd_completion);
55
56	return IRQ_HANDLED;
57}
58
59static int tpd_connect(struct omap_dss_device *dssdev,
60		struct omap_dss_device *dst)
61{
62	struct panel_drv_data *ddata = to_panel_data(dssdev);
63	struct omap_dss_device *in = ddata->in;
64	int r;
65
66	r = in->ops.hdmi->connect(in, dssdev);
67	if (r)
68		return r;
69
70	dst->src = dssdev;
71	dssdev->dst = dst;
72
73	reinit_completion(&ddata->hpd_completion);
74
75	gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
76	/* DC-DC converter needs at max 300us to get to 90% of 5V */
77	udelay(300);
78
79	/*
80	 * If there's a cable connected, wait for the hpd irq to trigger,
81	 * which turns on the level shifters.
82	 */
83	if (gpio_get_value_cansleep(ddata->hpd_gpio)) {
84		unsigned long to;
85		to = wait_for_completion_timeout(&ddata->hpd_completion,
86				msecs_to_jiffies(250));
87		WARN_ON_ONCE(to == 0);
88	}
89
90	return 0;
91}
92
93static void tpd_disconnect(struct omap_dss_device *dssdev,
94		struct omap_dss_device *dst)
95{
96	struct panel_drv_data *ddata = to_panel_data(dssdev);
97	struct omap_dss_device *in = ddata->in;
98
99	WARN_ON(dst != dssdev->dst);
100
101	if (dst != dssdev->dst)
102		return;
103
104	gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
105
106	dst->src = NULL;
107	dssdev->dst = NULL;
108
109	in->ops.hdmi->disconnect(in, &ddata->dssdev);
110}
111
112static int tpd_enable(struct omap_dss_device *dssdev)
113{
114	struct panel_drv_data *ddata = to_panel_data(dssdev);
115	struct omap_dss_device *in = ddata->in;
116	int r;
117
118	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
119		return 0;
120
121	in->ops.hdmi->set_timings(in, &ddata->timings);
122
123	r = in->ops.hdmi->enable(in);
124	if (r)
125		return r;
126
127	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
128
129	return r;
130}
131
132static void tpd_disable(struct omap_dss_device *dssdev)
133{
134	struct panel_drv_data *ddata = to_panel_data(dssdev);
135	struct omap_dss_device *in = ddata->in;
136
137	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
138		return;
139
140	in->ops.hdmi->disable(in);
141
142	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
143}
144
145static void tpd_set_timings(struct omap_dss_device *dssdev,
146		struct omap_video_timings *timings)
147{
148	struct panel_drv_data *ddata = to_panel_data(dssdev);
149	struct omap_dss_device *in = ddata->in;
150
151	ddata->timings = *timings;
152	dssdev->panel.timings = *timings;
153
154	in->ops.hdmi->set_timings(in, timings);
155}
156
157static void tpd_get_timings(struct omap_dss_device *dssdev,
158		struct omap_video_timings *timings)
159{
160	struct panel_drv_data *ddata = to_panel_data(dssdev);
161
162	*timings = ddata->timings;
163}
164
165static int tpd_check_timings(struct omap_dss_device *dssdev,
166		struct omap_video_timings *timings)
167{
168	struct panel_drv_data *ddata = to_panel_data(dssdev);
169	struct omap_dss_device *in = ddata->in;
170	int r;
171
172	r = in->ops.hdmi->check_timings(in, timings);
173
174	return r;
175}
176
177static int tpd_read_edid(struct omap_dss_device *dssdev,
178		u8 *edid, int len)
179{
180	struct panel_drv_data *ddata = to_panel_data(dssdev);
181	struct omap_dss_device *in = ddata->in;
182
183	if (!gpio_get_value_cansleep(ddata->hpd_gpio))
184		return -ENODEV;
185
186	return in->ops.hdmi->read_edid(in, edid, len);
187}
188
189static bool tpd_detect(struct omap_dss_device *dssdev)
190{
191	struct panel_drv_data *ddata = to_panel_data(dssdev);
192
193	return gpio_get_value_cansleep(ddata->hpd_gpio);
194}
195
196static int tpd_audio_enable(struct omap_dss_device *dssdev)
197{
198	struct panel_drv_data *ddata = to_panel_data(dssdev);
199	struct omap_dss_device *in = ddata->in;
200
201	return in->ops.hdmi->audio_enable(in);
202}
203
204static void tpd_audio_disable(struct omap_dss_device *dssdev)
205{
206	struct panel_drv_data *ddata = to_panel_data(dssdev);
207	struct omap_dss_device *in = ddata->in;
208
209	in->ops.hdmi->audio_disable(in);
210}
211
212static int tpd_audio_start(struct omap_dss_device *dssdev)
213{
214	struct panel_drv_data *ddata = to_panel_data(dssdev);
215	struct omap_dss_device *in = ddata->in;
216
217	return in->ops.hdmi->audio_start(in);
218}
219
220static void tpd_audio_stop(struct omap_dss_device *dssdev)
221{
222	struct panel_drv_data *ddata = to_panel_data(dssdev);
223	struct omap_dss_device *in = ddata->in;
224
225	in->ops.hdmi->audio_stop(in);
226}
227
228static bool tpd_audio_supported(struct omap_dss_device *dssdev)
229{
230	struct panel_drv_data *ddata = to_panel_data(dssdev);
231	struct omap_dss_device *in = ddata->in;
232
233	return in->ops.hdmi->audio_supported(in);
234}
235
236static int tpd_audio_config(struct omap_dss_device *dssdev,
237		struct omap_dss_audio *audio)
238{
239	struct panel_drv_data *ddata = to_panel_data(dssdev);
240	struct omap_dss_device *in = ddata->in;
241
242	return in->ops.hdmi->audio_config(in, audio);
243}
244
245static int tpd_set_infoframe(struct omap_dss_device *dssdev,
246		const struct hdmi_avi_infoframe *avi)
247{
248	struct panel_drv_data *ddata = to_panel_data(dssdev);
249	struct omap_dss_device *in = ddata->in;
250
251	return in->ops.hdmi->set_infoframe(in, avi);
252}
253
254static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
255		bool hdmi_mode)
256{
257	struct panel_drv_data *ddata = to_panel_data(dssdev);
258	struct omap_dss_device *in = ddata->in;
259
260	return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
261}
262
263static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
264	.connect		= tpd_connect,
265	.disconnect		= tpd_disconnect,
266
267	.enable			= tpd_enable,
268	.disable		= tpd_disable,
269
270	.check_timings		= tpd_check_timings,
271	.set_timings		= tpd_set_timings,
272	.get_timings		= tpd_get_timings,
273
274	.read_edid		= tpd_read_edid,
275	.detect			= tpd_detect,
276	.set_infoframe		= tpd_set_infoframe,
277	.set_hdmi_mode		= tpd_set_hdmi_mode,
278
279	.audio_enable		= tpd_audio_enable,
280	.audio_disable		= tpd_audio_disable,
281	.audio_start		= tpd_audio_start,
282	.audio_stop		= tpd_audio_stop,
283	.audio_supported	= tpd_audio_supported,
284	.audio_config		= tpd_audio_config,
285};
286
287static int tpd_probe_pdata(struct platform_device *pdev)
288{
289	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
290	struct encoder_tpd12s015_platform_data *pdata;
291	struct omap_dss_device *dssdev, *in;
292
293	pdata = dev_get_platdata(&pdev->dev);
294
295	ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
296	ddata->ls_oe_gpio = pdata->ls_oe_gpio;
297	ddata->hpd_gpio = pdata->hpd_gpio;
298
299	in = omap_dss_find_output(pdata->source);
300	if (in == NULL) {
301		dev_err(&pdev->dev, "Failed to find video source\n");
302		return -ENODEV;
303	}
304
305	ddata->in = in;
306
307	dssdev = &ddata->dssdev;
308	dssdev->name = pdata->name;
309
310	return 0;
311}
312
313static int tpd_probe_of(struct platform_device *pdev)
314{
315	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
316	struct device_node *node = pdev->dev.of_node;
317	struct omap_dss_device *in;
318	int gpio;
319
320	/* CT CP HPD GPIO */
321	gpio = of_get_gpio(node, 0);
322	if (!gpio_is_valid(gpio)) {
323		dev_err(&pdev->dev, "failed to parse CT CP HPD gpio\n");
324		return gpio;
325	}
326	ddata->ct_cp_hpd_gpio = gpio;
327
328	/* LS OE GPIO */
329	gpio = of_get_gpio(node, 1);
330	if (gpio_is_valid(gpio) || gpio == -ENOENT) {
331		ddata->ls_oe_gpio = gpio;
332	} else {
333		dev_err(&pdev->dev, "failed to parse LS OE gpio\n");
334		return gpio;
335	}
336
337	/* HPD GPIO */
338	gpio = of_get_gpio(node, 2);
339	if (!gpio_is_valid(gpio)) {
340		dev_err(&pdev->dev, "failed to parse HPD gpio\n");
341		return gpio;
342	}
343	ddata->hpd_gpio = gpio;
344
345	in = omapdss_of_find_source_for_first_ep(node);
346	if (IS_ERR(in)) {
347		dev_err(&pdev->dev, "failed to find video source\n");
348		return PTR_ERR(in);
349	}
350
351	ddata->in = in;
352
353	return 0;
354}
355
356static int tpd_probe(struct platform_device *pdev)
357{
358	struct omap_dss_device *in, *dssdev;
359	struct panel_drv_data *ddata;
360	int r;
361
362	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
363	if (!ddata)
364		return -ENOMEM;
365
366	platform_set_drvdata(pdev, ddata);
367
368	init_completion(&ddata->hpd_completion);
369
370	if (dev_get_platdata(&pdev->dev)) {
371		r = tpd_probe_pdata(pdev);
372		if (r)
373			return r;
374	} else if (pdev->dev.of_node) {
375		r = tpd_probe_of(pdev);
376		if (r)
377			return r;
378	} else {
379		return -ENODEV;
380	}
381
382	r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
383			GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
384	if (r)
385		goto err_gpio;
386
387	if (gpio_is_valid(ddata->ls_oe_gpio)) {
388		r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
389				GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
390		if (r)
391			goto err_gpio;
392	}
393
394	r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
395			GPIOF_DIR_IN, "hdmi_hpd");
396	if (r)
397		goto err_gpio;
398
399	r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio),
400				 NULL, tpd_hpd_irq_handler,
401				 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
402				 IRQF_ONESHOT, "hpd", ddata);
403	if (r)
404		goto err_irq;
405
406	dssdev = &ddata->dssdev;
407	dssdev->ops.hdmi = &tpd_hdmi_ops;
408	dssdev->dev = &pdev->dev;
409	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
410	dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
411	dssdev->owner = THIS_MODULE;
412
413	in = ddata->in;
414
415	r = omapdss_register_output(dssdev);
416	if (r) {
417		dev_err(&pdev->dev, "Failed to register output\n");
418		goto err_reg;
419	}
420
421	return 0;
422err_reg:
423err_irq:
424err_gpio:
425	omap_dss_put_device(ddata->in);
426	return r;
427}
428
429static int __exit tpd_remove(struct platform_device *pdev)
430{
431	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
432	struct omap_dss_device *dssdev = &ddata->dssdev;
433	struct omap_dss_device *in = ddata->in;
434
435	omapdss_unregister_output(&ddata->dssdev);
436
437	WARN_ON(omapdss_device_is_enabled(dssdev));
438	if (omapdss_device_is_enabled(dssdev))
439		tpd_disable(dssdev);
440
441	WARN_ON(omapdss_device_is_connected(dssdev));
442	if (omapdss_device_is_connected(dssdev))
443		tpd_disconnect(dssdev, dssdev->dst);
444
445	omap_dss_put_device(in);
446
447	return 0;
448}
449
450static const struct of_device_id tpd_of_match[] = {
451	{ .compatible = "omapdss,ti,tpd12s015", },
452	{},
453};
454
455MODULE_DEVICE_TABLE(of, tpd_of_match);
456
457static struct platform_driver tpd_driver = {
458	.probe	= tpd_probe,
459	.remove	= __exit_p(tpd_remove),
460	.driver	= {
461		.name	= "tpd12s015",
462		.owner	= THIS_MODULE,
463		.of_match_table = tpd_of_match,
464		.suppress_bind_attrs = true,
465	},
466};
467
468module_platform_driver(tpd_driver);
469
470MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
471MODULE_DESCRIPTION("TPD12S015 driver");
472MODULE_LICENSE("GPL");
473