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1 /*
2  * TPD12S015 HDMI ESD protection & level shifter chip driver
3  *
4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
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/platform_device.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/mutex.h>
19 
20 #include "../dss/omapdss.h"
21 
22 struct panel_drv_data {
23 	struct omap_dss_device dssdev;
24 	struct omap_dss_device *in;
25 	void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
26 	void *hpd_cb_data;
27 	bool hpd_enabled;
28 	struct mutex hpd_lock;
29 
30 	struct gpio_desc *ct_cp_hpd_gpio;
31 	struct gpio_desc *ls_oe_gpio;
32 	struct gpio_desc *hpd_gpio;
33 
34 	struct videomode vm;
35 };
36 
37 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
38 
tpd_connect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)39 static int tpd_connect(struct omap_dss_device *dssdev,
40 		struct omap_dss_device *dst)
41 {
42 	struct panel_drv_data *ddata = to_panel_data(dssdev);
43 	struct omap_dss_device *in;
44 	int r;
45 
46 	in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
47 	if (IS_ERR(in)) {
48 		dev_err(dssdev->dev, "failed to find video source\n");
49 		return PTR_ERR(in);
50 	}
51 
52 	r = in->ops.hdmi->connect(in, dssdev);
53 	if (r) {
54 		omap_dss_put_device(in);
55 		return r;
56 	}
57 
58 	dst->src = dssdev;
59 	dssdev->dst = dst;
60 
61 	gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
62 	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
63 
64 	/* DC-DC converter needs at max 300us to get to 90% of 5V */
65 	udelay(300);
66 
67 	ddata->in = in;
68 	return 0;
69 }
70 
tpd_disconnect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)71 static void tpd_disconnect(struct omap_dss_device *dssdev,
72 		struct omap_dss_device *dst)
73 {
74 	struct panel_drv_data *ddata = to_panel_data(dssdev);
75 	struct omap_dss_device *in = ddata->in;
76 
77 	WARN_ON(dst != dssdev->dst);
78 
79 	if (dst != dssdev->dst)
80 		return;
81 
82 	gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
83 	gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
84 
85 	dst->src = NULL;
86 	dssdev->dst = NULL;
87 
88 	in->ops.hdmi->disconnect(in, &ddata->dssdev);
89 
90 	omap_dss_put_device(in);
91 	ddata->in = NULL;
92 }
93 
tpd_enable(struct omap_dss_device * dssdev)94 static int tpd_enable(struct omap_dss_device *dssdev)
95 {
96 	struct panel_drv_data *ddata = to_panel_data(dssdev);
97 	struct omap_dss_device *in = ddata->in;
98 	int r;
99 
100 	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
101 		return 0;
102 
103 	in->ops.hdmi->set_timings(in, &ddata->vm);
104 
105 	r = in->ops.hdmi->enable(in);
106 	if (r)
107 		return r;
108 
109 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
110 
111 	return r;
112 }
113 
tpd_disable(struct omap_dss_device * dssdev)114 static void tpd_disable(struct omap_dss_device *dssdev)
115 {
116 	struct panel_drv_data *ddata = to_panel_data(dssdev);
117 	struct omap_dss_device *in = ddata->in;
118 
119 	if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
120 		return;
121 
122 	in->ops.hdmi->disable(in);
123 
124 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
125 }
126 
tpd_set_timings(struct omap_dss_device * dssdev,struct videomode * vm)127 static void tpd_set_timings(struct omap_dss_device *dssdev,
128 			    struct videomode *vm)
129 {
130 	struct panel_drv_data *ddata = to_panel_data(dssdev);
131 	struct omap_dss_device *in = ddata->in;
132 
133 	ddata->vm = *vm;
134 	dssdev->panel.vm = *vm;
135 
136 	in->ops.hdmi->set_timings(in, vm);
137 }
138 
tpd_get_timings(struct omap_dss_device * dssdev,struct videomode * vm)139 static void tpd_get_timings(struct omap_dss_device *dssdev,
140 			    struct videomode *vm)
141 {
142 	struct panel_drv_data *ddata = to_panel_data(dssdev);
143 
144 	*vm = ddata->vm;
145 }
146 
tpd_check_timings(struct omap_dss_device * dssdev,struct videomode * vm)147 static int tpd_check_timings(struct omap_dss_device *dssdev,
148 			     struct videomode *vm)
149 {
150 	struct panel_drv_data *ddata = to_panel_data(dssdev);
151 	struct omap_dss_device *in = ddata->in;
152 	int r;
153 
154 	r = in->ops.hdmi->check_timings(in, vm);
155 
156 	return r;
157 }
158 
tpd_read_edid(struct omap_dss_device * dssdev,u8 * edid,int len)159 static int tpd_read_edid(struct omap_dss_device *dssdev,
160 		u8 *edid, int len)
161 {
162 	struct panel_drv_data *ddata = to_panel_data(dssdev);
163 	struct omap_dss_device *in = ddata->in;
164 
165 	if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
166 		return -ENODEV;
167 
168 	return in->ops.hdmi->read_edid(in, edid, len);
169 }
170 
tpd_detect(struct omap_dss_device * dssdev)171 static bool tpd_detect(struct omap_dss_device *dssdev)
172 {
173 	struct panel_drv_data *ddata = to_panel_data(dssdev);
174 	struct omap_dss_device *in = ddata->in;
175 	bool connected = gpiod_get_value_cansleep(ddata->hpd_gpio);
176 
177 	if (!connected && in->ops.hdmi->lost_hotplug)
178 		in->ops.hdmi->lost_hotplug(in);
179 	return connected;
180 }
181 
tpd_register_hpd_cb(struct omap_dss_device * dssdev,void (* cb)(void * cb_data,enum drm_connector_status status),void * cb_data)182 static int tpd_register_hpd_cb(struct omap_dss_device *dssdev,
183 			       void (*cb)(void *cb_data,
184 					  enum drm_connector_status status),
185 			       void *cb_data)
186 {
187 	struct panel_drv_data *ddata = to_panel_data(dssdev);
188 
189 	mutex_lock(&ddata->hpd_lock);
190 	ddata->hpd_cb = cb;
191 	ddata->hpd_cb_data = cb_data;
192 	mutex_unlock(&ddata->hpd_lock);
193 
194 	return 0;
195 }
196 
tpd_unregister_hpd_cb(struct omap_dss_device * dssdev)197 static void tpd_unregister_hpd_cb(struct omap_dss_device *dssdev)
198 {
199 	struct panel_drv_data *ddata = to_panel_data(dssdev);
200 
201 	mutex_lock(&ddata->hpd_lock);
202 	ddata->hpd_cb = NULL;
203 	ddata->hpd_cb_data = NULL;
204 	mutex_unlock(&ddata->hpd_lock);
205 }
206 
tpd_enable_hpd(struct omap_dss_device * dssdev)207 static void tpd_enable_hpd(struct omap_dss_device *dssdev)
208 {
209 	struct panel_drv_data *ddata = to_panel_data(dssdev);
210 
211 	mutex_lock(&ddata->hpd_lock);
212 	ddata->hpd_enabled = true;
213 	mutex_unlock(&ddata->hpd_lock);
214 }
215 
tpd_disable_hpd(struct omap_dss_device * dssdev)216 static void tpd_disable_hpd(struct omap_dss_device *dssdev)
217 {
218 	struct panel_drv_data *ddata = to_panel_data(dssdev);
219 
220 	mutex_lock(&ddata->hpd_lock);
221 	ddata->hpd_enabled = false;
222 	mutex_unlock(&ddata->hpd_lock);
223 }
224 
tpd_set_infoframe(struct omap_dss_device * dssdev,const struct hdmi_avi_infoframe * avi)225 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
226 		const struct hdmi_avi_infoframe *avi)
227 {
228 	struct panel_drv_data *ddata = to_panel_data(dssdev);
229 	struct omap_dss_device *in = ddata->in;
230 
231 	return in->ops.hdmi->set_infoframe(in, avi);
232 }
233 
tpd_set_hdmi_mode(struct omap_dss_device * dssdev,bool hdmi_mode)234 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
235 		bool hdmi_mode)
236 {
237 	struct panel_drv_data *ddata = to_panel_data(dssdev);
238 	struct omap_dss_device *in = ddata->in;
239 
240 	return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
241 }
242 
243 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
244 	.connect		= tpd_connect,
245 	.disconnect		= tpd_disconnect,
246 
247 	.enable			= tpd_enable,
248 	.disable		= tpd_disable,
249 
250 	.check_timings		= tpd_check_timings,
251 	.set_timings		= tpd_set_timings,
252 	.get_timings		= tpd_get_timings,
253 
254 	.read_edid		= tpd_read_edid,
255 	.detect			= tpd_detect,
256 	.register_hpd_cb	= tpd_register_hpd_cb,
257 	.unregister_hpd_cb	= tpd_unregister_hpd_cb,
258 	.enable_hpd		= tpd_enable_hpd,
259 	.disable_hpd		= tpd_disable_hpd,
260 	.set_infoframe		= tpd_set_infoframe,
261 	.set_hdmi_mode		= tpd_set_hdmi_mode,
262 };
263 
tpd_hpd_isr(int irq,void * data)264 static irqreturn_t tpd_hpd_isr(int irq, void *data)
265 {
266 	struct panel_drv_data *ddata = data;
267 
268 	mutex_lock(&ddata->hpd_lock);
269 	if (ddata->hpd_enabled && ddata->hpd_cb) {
270 		enum drm_connector_status status;
271 
272 		if (tpd_detect(&ddata->dssdev))
273 			status = connector_status_connected;
274 		else
275 			status = connector_status_disconnected;
276 
277 		ddata->hpd_cb(ddata->hpd_cb_data, status);
278 	}
279 	mutex_unlock(&ddata->hpd_lock);
280 
281 	return IRQ_HANDLED;
282 }
283 
tpd_probe(struct platform_device * pdev)284 static int tpd_probe(struct platform_device *pdev)
285 {
286 	struct omap_dss_device *in, *dssdev;
287 	struct panel_drv_data *ddata;
288 	int r;
289 	struct gpio_desc *gpio;
290 
291 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
292 	if (!ddata)
293 		return -ENOMEM;
294 
295 	platform_set_drvdata(pdev, ddata);
296 
297 	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
298 		 GPIOD_OUT_LOW);
299 	if (IS_ERR(gpio))
300 		return PTR_ERR(gpio);
301 
302 	ddata->ct_cp_hpd_gpio = gpio;
303 
304 	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
305 		 GPIOD_OUT_LOW);
306 	if (IS_ERR(gpio))
307 		return PTR_ERR(gpio);
308 
309 	ddata->ls_oe_gpio = gpio;
310 
311 	gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
312 		GPIOD_IN);
313 	if (IS_ERR(gpio))
314 		return PTR_ERR(gpio);
315 
316 	ddata->hpd_gpio = gpio;
317 
318 	mutex_init(&ddata->hpd_lock);
319 
320 	r = devm_request_threaded_irq(&pdev->dev, gpiod_to_irq(ddata->hpd_gpio),
321 		NULL, tpd_hpd_isr,
322 		IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
323 		"tpd12s015 hpd", ddata);
324 	if (r)
325 		return r;
326 
327 	dssdev = &ddata->dssdev;
328 	dssdev->ops.hdmi = &tpd_hdmi_ops;
329 	dssdev->dev = &pdev->dev;
330 	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
331 	dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
332 	dssdev->owner = THIS_MODULE;
333 	dssdev->port_num = 1;
334 
335 	in = ddata->in;
336 
337 	r = omapdss_register_output(dssdev);
338 	if (r) {
339 		dev_err(&pdev->dev, "Failed to register output\n");
340 		return r;
341 	}
342 
343 	return 0;
344 }
345 
tpd_remove(struct platform_device * pdev)346 static int __exit tpd_remove(struct platform_device *pdev)
347 {
348 	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
349 	struct omap_dss_device *dssdev = &ddata->dssdev;
350 
351 	omapdss_unregister_output(&ddata->dssdev);
352 
353 	WARN_ON(omapdss_device_is_enabled(dssdev));
354 	if (omapdss_device_is_enabled(dssdev))
355 		tpd_disable(dssdev);
356 
357 	WARN_ON(omapdss_device_is_connected(dssdev));
358 	if (omapdss_device_is_connected(dssdev))
359 		tpd_disconnect(dssdev, dssdev->dst);
360 
361 	return 0;
362 }
363 
364 static const struct of_device_id tpd_of_match[] = {
365 	{ .compatible = "omapdss,ti,tpd12s015", },
366 	{},
367 };
368 
369 MODULE_DEVICE_TABLE(of, tpd_of_match);
370 
371 static struct platform_driver tpd_driver = {
372 	.probe	= tpd_probe,
373 	.remove	= __exit_p(tpd_remove),
374 	.driver	= {
375 		.name	= "tpd12s015",
376 		.of_match_table = tpd_of_match,
377 		.suppress_bind_attrs = true,
378 	},
379 };
380 
381 module_platform_driver(tpd_driver);
382 
383 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
384 MODULE_DESCRIPTION("TPD12S015 driver");
385 MODULE_LICENSE("GPL");
386