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
23 struct 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
34 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
35
tpd_connect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)36 static int tpd_connect(struct omap_dss_device *dssdev,
37 struct omap_dss_device *dst)
38 {
39 struct panel_drv_data *ddata = to_panel_data(dssdev);
40 struct omap_dss_device *in = ddata->in;
41 int r;
42
43 r = in->ops.hdmi->connect(in, dssdev);
44 if (r)
45 return r;
46
47 dst->src = dssdev;
48 dssdev->dst = dst;
49
50 gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
51 /* DC-DC converter needs at max 300us to get to 90% of 5V */
52 udelay(300);
53
54 return 0;
55 }
56
tpd_disconnect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)57 static void tpd_disconnect(struct omap_dss_device *dssdev,
58 struct omap_dss_device *dst)
59 {
60 struct panel_drv_data *ddata = to_panel_data(dssdev);
61 struct omap_dss_device *in = ddata->in;
62
63 WARN_ON(dst != dssdev->dst);
64
65 if (dst != dssdev->dst)
66 return;
67
68 gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
69
70 dst->src = NULL;
71 dssdev->dst = NULL;
72
73 in->ops.hdmi->disconnect(in, &ddata->dssdev);
74 }
75
tpd_enable(struct omap_dss_device * dssdev)76 static int tpd_enable(struct omap_dss_device *dssdev)
77 {
78 struct panel_drv_data *ddata = to_panel_data(dssdev);
79 struct omap_dss_device *in = ddata->in;
80 int r;
81
82 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
83 return 0;
84
85 in->ops.hdmi->set_timings(in, &ddata->timings);
86
87 r = in->ops.hdmi->enable(in);
88 if (r)
89 return r;
90
91 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
92
93 return r;
94 }
95
tpd_disable(struct omap_dss_device * dssdev)96 static void tpd_disable(struct omap_dss_device *dssdev)
97 {
98 struct panel_drv_data *ddata = to_panel_data(dssdev);
99 struct omap_dss_device *in = ddata->in;
100
101 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
102 return;
103
104 in->ops.hdmi->disable(in);
105
106 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
107 }
108
tpd_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)109 static void tpd_set_timings(struct omap_dss_device *dssdev,
110 struct omap_video_timings *timings)
111 {
112 struct panel_drv_data *ddata = to_panel_data(dssdev);
113 struct omap_dss_device *in = ddata->in;
114
115 ddata->timings = *timings;
116 dssdev->panel.timings = *timings;
117
118 in->ops.hdmi->set_timings(in, timings);
119 }
120
tpd_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)121 static void tpd_get_timings(struct omap_dss_device *dssdev,
122 struct omap_video_timings *timings)
123 {
124 struct panel_drv_data *ddata = to_panel_data(dssdev);
125
126 *timings = ddata->timings;
127 }
128
tpd_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)129 static int tpd_check_timings(struct omap_dss_device *dssdev,
130 struct omap_video_timings *timings)
131 {
132 struct panel_drv_data *ddata = to_panel_data(dssdev);
133 struct omap_dss_device *in = ddata->in;
134 int r;
135
136 r = in->ops.hdmi->check_timings(in, timings);
137
138 return r;
139 }
140
tpd_read_edid(struct omap_dss_device * dssdev,u8 * edid,int len)141 static int tpd_read_edid(struct omap_dss_device *dssdev,
142 u8 *edid, int len)
143 {
144 struct panel_drv_data *ddata = to_panel_data(dssdev);
145 struct omap_dss_device *in = ddata->in;
146 int r;
147
148 if (!gpio_get_value_cansleep(ddata->hpd_gpio))
149 return -ENODEV;
150
151 if (gpio_is_valid(ddata->ls_oe_gpio))
152 gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
153
154 r = in->ops.hdmi->read_edid(in, edid, len);
155
156 if (gpio_is_valid(ddata->ls_oe_gpio))
157 gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
158
159 return r;
160 }
161
tpd_detect(struct omap_dss_device * dssdev)162 static bool tpd_detect(struct omap_dss_device *dssdev)
163 {
164 struct panel_drv_data *ddata = to_panel_data(dssdev);
165
166 return gpio_get_value_cansleep(ddata->hpd_gpio);
167 }
168
tpd_set_infoframe(struct omap_dss_device * dssdev,const struct hdmi_avi_infoframe * avi)169 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
170 const struct hdmi_avi_infoframe *avi)
171 {
172 struct panel_drv_data *ddata = to_panel_data(dssdev);
173 struct omap_dss_device *in = ddata->in;
174
175 return in->ops.hdmi->set_infoframe(in, avi);
176 }
177
tpd_set_hdmi_mode(struct omap_dss_device * dssdev,bool hdmi_mode)178 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
179 bool hdmi_mode)
180 {
181 struct panel_drv_data *ddata = to_panel_data(dssdev);
182 struct omap_dss_device *in = ddata->in;
183
184 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
185 }
186
187 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
188 .connect = tpd_connect,
189 .disconnect = tpd_disconnect,
190
191 .enable = tpd_enable,
192 .disable = tpd_disable,
193
194 .check_timings = tpd_check_timings,
195 .set_timings = tpd_set_timings,
196 .get_timings = tpd_get_timings,
197
198 .read_edid = tpd_read_edid,
199 .detect = tpd_detect,
200 .set_infoframe = tpd_set_infoframe,
201 .set_hdmi_mode = tpd_set_hdmi_mode,
202 };
203
tpd_probe_pdata(struct platform_device * pdev)204 static int tpd_probe_pdata(struct platform_device *pdev)
205 {
206 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
207 struct encoder_tpd12s015_platform_data *pdata;
208 struct omap_dss_device *dssdev, *in;
209
210 pdata = dev_get_platdata(&pdev->dev);
211
212 ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
213 ddata->ls_oe_gpio = pdata->ls_oe_gpio;
214 ddata->hpd_gpio = pdata->hpd_gpio;
215
216 in = omap_dss_find_output(pdata->source);
217 if (in == NULL) {
218 dev_err(&pdev->dev, "Failed to find video source\n");
219 return -ENODEV;
220 }
221
222 ddata->in = in;
223
224 dssdev = &ddata->dssdev;
225 dssdev->name = pdata->name;
226
227 return 0;
228 }
229
tpd_probe_of(struct platform_device * pdev)230 static int tpd_probe_of(struct platform_device *pdev)
231 {
232 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
233 struct device_node *node = pdev->dev.of_node;
234 struct omap_dss_device *in;
235 int gpio;
236
237 /* CT CP HPD GPIO */
238 gpio = of_get_gpio(node, 0);
239 if (!gpio_is_valid(gpio)) {
240 dev_err(&pdev->dev, "failed to parse CT CP HPD gpio\n");
241 return gpio;
242 }
243 ddata->ct_cp_hpd_gpio = gpio;
244
245 /* LS OE GPIO */
246 gpio = of_get_gpio(node, 1);
247 if (gpio_is_valid(gpio) || gpio == -ENOENT) {
248 ddata->ls_oe_gpio = gpio;
249 } else {
250 dev_err(&pdev->dev, "failed to parse LS OE gpio\n");
251 return gpio;
252 }
253
254 /* HPD GPIO */
255 gpio = of_get_gpio(node, 2);
256 if (!gpio_is_valid(gpio)) {
257 dev_err(&pdev->dev, "failed to parse HPD gpio\n");
258 return gpio;
259 }
260 ddata->hpd_gpio = gpio;
261
262 in = omapdss_of_find_source_for_first_ep(node);
263 if (IS_ERR(in)) {
264 dev_err(&pdev->dev, "failed to find video source\n");
265 return PTR_ERR(in);
266 }
267
268 ddata->in = in;
269
270 return 0;
271 }
272
tpd_probe(struct platform_device * pdev)273 static int tpd_probe(struct platform_device *pdev)
274 {
275 struct omap_dss_device *in, *dssdev;
276 struct panel_drv_data *ddata;
277 int r;
278
279 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
280 if (!ddata)
281 return -ENOMEM;
282
283 platform_set_drvdata(pdev, ddata);
284
285 if (dev_get_platdata(&pdev->dev)) {
286 r = tpd_probe_pdata(pdev);
287 if (r)
288 return r;
289 } else if (pdev->dev.of_node) {
290 r = tpd_probe_of(pdev);
291 if (r)
292 return r;
293 } else {
294 return -ENODEV;
295 }
296
297 r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
298 GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
299 if (r)
300 goto err_gpio;
301
302 if (gpio_is_valid(ddata->ls_oe_gpio)) {
303 r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
304 GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
305 if (r)
306 goto err_gpio;
307 }
308
309 r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
310 GPIOF_DIR_IN, "hdmi_hpd");
311 if (r)
312 goto err_gpio;
313
314 dssdev = &ddata->dssdev;
315 dssdev->ops.hdmi = &tpd_hdmi_ops;
316 dssdev->dev = &pdev->dev;
317 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
318 dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
319 dssdev->owner = THIS_MODULE;
320 dssdev->port_num = 1;
321
322 in = ddata->in;
323
324 r = omapdss_register_output(dssdev);
325 if (r) {
326 dev_err(&pdev->dev, "Failed to register output\n");
327 goto err_reg;
328 }
329
330 return 0;
331 err_reg:
332 err_gpio:
333 omap_dss_put_device(ddata->in);
334 return r;
335 }
336
tpd_remove(struct platform_device * pdev)337 static int __exit tpd_remove(struct platform_device *pdev)
338 {
339 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
340 struct omap_dss_device *dssdev = &ddata->dssdev;
341 struct omap_dss_device *in = ddata->in;
342
343 omapdss_unregister_output(&ddata->dssdev);
344
345 WARN_ON(omapdss_device_is_enabled(dssdev));
346 if (omapdss_device_is_enabled(dssdev))
347 tpd_disable(dssdev);
348
349 WARN_ON(omapdss_device_is_connected(dssdev));
350 if (omapdss_device_is_connected(dssdev))
351 tpd_disconnect(dssdev, dssdev->dst);
352
353 omap_dss_put_device(in);
354
355 return 0;
356 }
357
358 static const struct of_device_id tpd_of_match[] = {
359 { .compatible = "omapdss,ti,tpd12s015", },
360 {},
361 };
362
363 MODULE_DEVICE_TABLE(of, tpd_of_match);
364
365 static struct platform_driver tpd_driver = {
366 .probe = tpd_probe,
367 .remove = __exit_p(tpd_remove),
368 .driver = {
369 .name = "tpd12s015",
370 .of_match_table = tpd_of_match,
371 .suppress_bind_attrs = true,
372 },
373 };
374
375 module_platform_driver(tpd_driver);
376
377 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
378 MODULE_DESCRIPTION("TPD12S015 driver");
379 MODULE_LICENSE("GPL");
380