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a0ee577f TV |
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 | ||
19 | #include <video/omapdss.h> | |
20 | #include <video/omap-panel-data.h> | |
21 | ||
22 | struct panel_drv_data { | |
23 | struct omap_dss_device dssdev; | |
24 | struct omap_dss_device *in; | |
25 | ||
26 | int ct_cp_hpd_gpio; | |
27 | int ls_oe_gpio; | |
28 | int hpd_gpio; | |
29 | ||
30 | struct omap_video_timings timings; | |
31 | ||
32 | struct completion hpd_completion; | |
33 | }; | |
34 | ||
35 | #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) | |
36 | ||
37 | static irqreturn_t tpd_hpd_irq_handler(int irq, void *data) | |
38 | { | |
39 | struct panel_drv_data *ddata = data; | |
40 | bool hpd; | |
41 | ||
42 | hpd = gpio_get_value_cansleep(ddata->hpd_gpio); | |
43 | ||
44 | dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd); | |
45 | ||
46 | if (gpio_is_valid(ddata->ls_oe_gpio)) { | |
47 | if (hpd) | |
48 | gpio_set_value_cansleep(ddata->ls_oe_gpio, 1); | |
49 | else | |
50 | gpio_set_value_cansleep(ddata->ls_oe_gpio, 0); | |
51 | } | |
52 | ||
53 | complete_all(&ddata->hpd_completion); | |
54 | ||
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | static int tpd_connect(struct omap_dss_device *dssdev, | |
59 | struct omap_dss_device *dst) | |
60 | { | |
61 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
62 | struct omap_dss_device *in = ddata->in; | |
63 | int r; | |
64 | ||
65 | r = in->ops.hdmi->connect(in, dssdev); | |
66 | if (r) | |
67 | return r; | |
68 | ||
a73fdc64 | 69 | dst->src = dssdev; |
9560dc10 | 70 | dssdev->dst = dst; |
a0ee577f | 71 | |
16735d02 | 72 | reinit_completion(&ddata->hpd_completion); |
a0ee577f TV |
73 | |
74 | gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1); | |
75 | /* DC-DC converter needs at max 300us to get to 90% of 5V */ | |
76 | udelay(300); | |
77 | ||
78 | /* | |
79 | * If there's a cable connected, wait for the hpd irq to trigger, | |
80 | * which turns on the level shifters. | |
81 | */ | |
82 | if (gpio_get_value_cansleep(ddata->hpd_gpio)) { | |
83 | unsigned long to; | |
84 | to = wait_for_completion_timeout(&ddata->hpd_completion, | |
85 | msecs_to_jiffies(250)); | |
86 | WARN_ON_ONCE(to == 0); | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static void tpd_disconnect(struct omap_dss_device *dssdev, | |
93 | struct omap_dss_device *dst) | |
94 | { | |
95 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
96 | struct omap_dss_device *in = ddata->in; | |
97 | ||
9560dc10 | 98 | WARN_ON(dst != dssdev->dst); |
a0ee577f | 99 | |
9560dc10 | 100 | if (dst != dssdev->dst) |
a0ee577f TV |
101 | return; |
102 | ||
103 | gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0); | |
104 | ||
a73fdc64 | 105 | dst->src = NULL; |
9560dc10 | 106 | dssdev->dst = NULL; |
a0ee577f TV |
107 | |
108 | in->ops.hdmi->disconnect(in, &ddata->dssdev); | |
109 | } | |
110 | ||
111 | static int tpd_enable(struct omap_dss_device *dssdev) | |
112 | { | |
113 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
114 | struct omap_dss_device *in = ddata->in; | |
115 | int r; | |
116 | ||
117 | if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) | |
118 | return 0; | |
119 | ||
120 | in->ops.hdmi->set_timings(in, &ddata->timings); | |
121 | ||
122 | r = in->ops.hdmi->enable(in); | |
123 | if (r) | |
124 | return r; | |
125 | ||
126 | dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; | |
127 | ||
128 | return r; | |
129 | } | |
130 | ||
131 | static void tpd_disable(struct omap_dss_device *dssdev) | |
132 | { | |
133 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
134 | struct omap_dss_device *in = ddata->in; | |
135 | ||
136 | if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) | |
137 | return; | |
138 | ||
139 | in->ops.hdmi->disable(in); | |
140 | ||
141 | dssdev->state = OMAP_DSS_DISPLAY_DISABLED; | |
142 | } | |
143 | ||
144 | static void tpd_set_timings(struct omap_dss_device *dssdev, | |
145 | struct omap_video_timings *timings) | |
146 | { | |
147 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
148 | struct omap_dss_device *in = ddata->in; | |
149 | ||
150 | ddata->timings = *timings; | |
151 | dssdev->panel.timings = *timings; | |
152 | ||
153 | in->ops.hdmi->set_timings(in, timings); | |
154 | } | |
155 | ||
156 | static void tpd_get_timings(struct omap_dss_device *dssdev, | |
157 | struct omap_video_timings *timings) | |
158 | { | |
159 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
160 | ||
161 | *timings = ddata->timings; | |
162 | } | |
163 | ||
164 | static int tpd_check_timings(struct omap_dss_device *dssdev, | |
165 | struct omap_video_timings *timings) | |
166 | { | |
167 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
168 | struct omap_dss_device *in = ddata->in; | |
169 | int r; | |
170 | ||
171 | r = in->ops.hdmi->check_timings(in, timings); | |
172 | ||
173 | return r; | |
174 | } | |
175 | ||
176 | static int tpd_read_edid(struct omap_dss_device *dssdev, | |
177 | u8 *edid, int len) | |
178 | { | |
179 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
180 | struct omap_dss_device *in = ddata->in; | |
181 | ||
182 | if (!gpio_get_value_cansleep(ddata->hpd_gpio)) | |
183 | return -ENODEV; | |
184 | ||
185 | return in->ops.hdmi->read_edid(in, edid, len); | |
186 | } | |
187 | ||
188 | static bool tpd_detect(struct omap_dss_device *dssdev) | |
189 | { | |
190 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
191 | ||
192 | return gpio_get_value_cansleep(ddata->hpd_gpio); | |
193 | } | |
194 | ||
195 | static int tpd_audio_enable(struct omap_dss_device *dssdev) | |
196 | { | |
197 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
198 | struct omap_dss_device *in = ddata->in; | |
199 | ||
200 | return in->ops.hdmi->audio_enable(in); | |
201 | } | |
202 | ||
203 | static void tpd_audio_disable(struct omap_dss_device *dssdev) | |
204 | { | |
205 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
206 | struct omap_dss_device *in = ddata->in; | |
207 | ||
208 | in->ops.hdmi->audio_disable(in); | |
209 | } | |
210 | ||
211 | static int tpd_audio_start(struct omap_dss_device *dssdev) | |
212 | { | |
213 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
214 | struct omap_dss_device *in = ddata->in; | |
215 | ||
216 | return in->ops.hdmi->audio_start(in); | |
217 | } | |
218 | ||
219 | static void tpd_audio_stop(struct omap_dss_device *dssdev) | |
220 | { | |
221 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
222 | struct omap_dss_device *in = ddata->in; | |
223 | ||
224 | in->ops.hdmi->audio_stop(in); | |
225 | } | |
226 | ||
227 | static bool tpd_audio_supported(struct omap_dss_device *dssdev) | |
228 | { | |
229 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
230 | struct omap_dss_device *in = ddata->in; | |
231 | ||
232 | return in->ops.hdmi->audio_supported(in); | |
233 | } | |
234 | ||
235 | static int tpd_audio_config(struct omap_dss_device *dssdev, | |
236 | struct omap_dss_audio *audio) | |
237 | { | |
238 | struct panel_drv_data *ddata = to_panel_data(dssdev); | |
239 | struct omap_dss_device *in = ddata->in; | |
240 | ||
241 | return in->ops.hdmi->audio_config(in, audio); | |
242 | } | |
243 | ||
244 | static const struct omapdss_hdmi_ops tpd_hdmi_ops = { | |
245 | .connect = tpd_connect, | |
246 | .disconnect = tpd_disconnect, | |
247 | ||
248 | .enable = tpd_enable, | |
249 | .disable = tpd_disable, | |
250 | ||
251 | .check_timings = tpd_check_timings, | |
252 | .set_timings = tpd_set_timings, | |
253 | .get_timings = tpd_get_timings, | |
254 | ||
255 | .read_edid = tpd_read_edid, | |
256 | .detect = tpd_detect, | |
257 | ||
258 | .audio_enable = tpd_audio_enable, | |
259 | .audio_disable = tpd_audio_disable, | |
260 | .audio_start = tpd_audio_start, | |
261 | .audio_stop = tpd_audio_stop, | |
262 | .audio_supported = tpd_audio_supported, | |
263 | .audio_config = tpd_audio_config, | |
264 | }; | |
265 | ||
266 | static int tpd_probe_pdata(struct platform_device *pdev) | |
267 | { | |
268 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); | |
269 | struct encoder_tpd12s015_platform_data *pdata; | |
270 | struct omap_dss_device *dssdev, *in; | |
271 | ||
272 | pdata = dev_get_platdata(&pdev->dev); | |
273 | ||
274 | ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio; | |
275 | ddata->ls_oe_gpio = pdata->ls_oe_gpio; | |
276 | ddata->hpd_gpio = pdata->hpd_gpio; | |
277 | ||
278 | in = omap_dss_find_output(pdata->source); | |
279 | if (in == NULL) { | |
280 | dev_err(&pdev->dev, "Failed to find video source\n"); | |
281 | return -ENODEV; | |
282 | } | |
283 | ||
284 | ddata->in = in; | |
285 | ||
286 | dssdev = &ddata->dssdev; | |
287 | dssdev->name = pdata->name; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | static int tpd_probe(struct platform_device *pdev) | |
293 | { | |
294 | struct omap_dss_device *in, *dssdev; | |
295 | struct panel_drv_data *ddata; | |
296 | int r; | |
297 | ||
298 | ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); | |
299 | if (!ddata) | |
300 | return -ENOMEM; | |
301 | ||
302 | platform_set_drvdata(pdev, ddata); | |
303 | ||
304 | init_completion(&ddata->hpd_completion); | |
305 | ||
306 | if (dev_get_platdata(&pdev->dev)) { | |
307 | r = tpd_probe_pdata(pdev); | |
308 | if (r) | |
309 | return r; | |
310 | } else { | |
311 | return -ENODEV; | |
312 | } | |
313 | ||
314 | r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio, | |
315 | GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd"); | |
316 | if (r) | |
317 | goto err_gpio; | |
318 | ||
319 | if (gpio_is_valid(ddata->ls_oe_gpio)) { | |
320 | r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio, | |
321 | GPIOF_OUT_INIT_LOW, "hdmi_ls_oe"); | |
322 | if (r) | |
323 | goto err_gpio; | |
324 | } | |
325 | ||
326 | r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio, | |
327 | GPIOF_DIR_IN, "hdmi_hpd"); | |
328 | if (r) | |
329 | goto err_gpio; | |
330 | ||
331 | r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio), | |
332 | NULL, tpd_hpd_irq_handler, | |
333 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | | |
334 | IRQF_ONESHOT, "hpd", ddata); | |
335 | if (r) | |
336 | goto err_irq; | |
337 | ||
338 | dssdev = &ddata->dssdev; | |
339 | dssdev->ops.hdmi = &tpd_hdmi_ops; | |
340 | dssdev->dev = &pdev->dev; | |
341 | dssdev->type = OMAP_DISPLAY_TYPE_HDMI; | |
342 | dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI; | |
343 | dssdev->owner = THIS_MODULE; | |
344 | ||
345 | in = ddata->in; | |
346 | ||
347 | r = omapdss_register_output(dssdev); | |
348 | if (r) { | |
349 | dev_err(&pdev->dev, "Failed to register output\n"); | |
350 | goto err_reg; | |
351 | } | |
352 | ||
353 | return 0; | |
354 | err_reg: | |
355 | err_irq: | |
356 | err_gpio: | |
357 | omap_dss_put_device(ddata->in); | |
358 | return r; | |
359 | } | |
360 | ||
361 | static int __exit tpd_remove(struct platform_device *pdev) | |
362 | { | |
363 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); | |
364 | struct omap_dss_device *dssdev = &ddata->dssdev; | |
365 | struct omap_dss_device *in = ddata->in; | |
366 | ||
367 | omapdss_unregister_output(&ddata->dssdev); | |
368 | ||
369 | WARN_ON(omapdss_device_is_enabled(dssdev)); | |
370 | if (omapdss_device_is_enabled(dssdev)) | |
371 | tpd_disable(dssdev); | |
372 | ||
373 | WARN_ON(omapdss_device_is_connected(dssdev)); | |
374 | if (omapdss_device_is_connected(dssdev)) | |
9560dc10 | 375 | tpd_disconnect(dssdev, dssdev->dst); |
a0ee577f TV |
376 | |
377 | omap_dss_put_device(in); | |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
382 | static struct platform_driver tpd_driver = { | |
383 | .probe = tpd_probe, | |
384 | .remove = __exit_p(tpd_remove), | |
385 | .driver = { | |
386 | .name = "tpd12s015", | |
387 | .owner = THIS_MODULE, | |
388 | }, | |
389 | }; | |
390 | ||
391 | module_platform_driver(tpd_driver); | |
392 | ||
393 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); | |
394 | MODULE_DESCRIPTION("TPD12S015 driver"); | |
395 | MODULE_LICENSE("GPL"); |