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/platform_device.h>
17 #include <linux/gpio/consumer.h>
18
19 #include "../dss/omapdss.h"
20
21 struct panel_drv_data {
22 struct omap_dss_device dssdev;
23 struct omap_dss_device *in;
24
25 struct gpio_desc *ct_cp_hpd_gpio;
26 struct gpio_desc *ls_oe_gpio;
27 struct gpio_desc *hpd_gpio;
28
29 struct omap_video_timings timings;
30 };
31
32 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
33
tpd_connect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)34 static int tpd_connect(struct omap_dss_device *dssdev,
35 struct omap_dss_device *dst)
36 {
37 struct panel_drv_data *ddata = to_panel_data(dssdev);
38 struct omap_dss_device *in = ddata->in;
39 int r;
40
41 r = in->ops.hdmi->connect(in, dssdev);
42 if (r)
43 return r;
44
45 dst->src = dssdev;
46 dssdev->dst = dst;
47
48 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
49 /* DC-DC converter needs at max 300us to get to 90% of 5V */
50 udelay(300);
51
52 return 0;
53 }
54
tpd_disconnect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)55 static void tpd_disconnect(struct omap_dss_device *dssdev,
56 struct omap_dss_device *dst)
57 {
58 struct panel_drv_data *ddata = to_panel_data(dssdev);
59 struct omap_dss_device *in = ddata->in;
60
61 WARN_ON(dst != dssdev->dst);
62
63 if (dst != dssdev->dst)
64 return;
65
66 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
67
68 dst->src = NULL;
69 dssdev->dst = NULL;
70
71 in->ops.hdmi->disconnect(in, &ddata->dssdev);
72 }
73
tpd_enable(struct omap_dss_device * dssdev)74 static int tpd_enable(struct omap_dss_device *dssdev)
75 {
76 struct panel_drv_data *ddata = to_panel_data(dssdev);
77 struct omap_dss_device *in = ddata->in;
78 int r;
79
80 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
81 return 0;
82
83 in->ops.hdmi->set_timings(in, &ddata->timings);
84
85 r = in->ops.hdmi->enable(in);
86 if (r)
87 return r;
88
89 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
90
91 return r;
92 }
93
tpd_disable(struct omap_dss_device * dssdev)94 static void tpd_disable(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
99 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
100 return;
101
102 in->ops.hdmi->disable(in);
103
104 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
105 }
106
tpd_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)107 static void tpd_set_timings(struct omap_dss_device *dssdev,
108 struct omap_video_timings *timings)
109 {
110 struct panel_drv_data *ddata = to_panel_data(dssdev);
111 struct omap_dss_device *in = ddata->in;
112
113 ddata->timings = *timings;
114 dssdev->panel.timings = *timings;
115
116 in->ops.hdmi->set_timings(in, timings);
117 }
118
tpd_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)119 static void tpd_get_timings(struct omap_dss_device *dssdev,
120 struct omap_video_timings *timings)
121 {
122 struct panel_drv_data *ddata = to_panel_data(dssdev);
123
124 *timings = ddata->timings;
125 }
126
tpd_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)127 static int tpd_check_timings(struct omap_dss_device *dssdev,
128 struct omap_video_timings *timings)
129 {
130 struct panel_drv_data *ddata = to_panel_data(dssdev);
131 struct omap_dss_device *in = ddata->in;
132 int r;
133
134 r = in->ops.hdmi->check_timings(in, timings);
135
136 return r;
137 }
138
tpd_read_edid(struct omap_dss_device * dssdev,u8 * edid,int len)139 static int tpd_read_edid(struct omap_dss_device *dssdev,
140 u8 *edid, int len)
141 {
142 struct panel_drv_data *ddata = to_panel_data(dssdev);
143 struct omap_dss_device *in = ddata->in;
144 int r;
145
146 if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
147 return -ENODEV;
148
149 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
150
151 r = in->ops.hdmi->read_edid(in, edid, len);
152
153 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
154
155 return r;
156 }
157
tpd_detect(struct omap_dss_device * dssdev)158 static bool tpd_detect(struct omap_dss_device *dssdev)
159 {
160 struct panel_drv_data *ddata = to_panel_data(dssdev);
161
162 return gpiod_get_value_cansleep(ddata->hpd_gpio);
163 }
164
tpd_set_infoframe(struct omap_dss_device * dssdev,const struct hdmi_avi_infoframe * avi)165 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
166 const struct hdmi_avi_infoframe *avi)
167 {
168 struct panel_drv_data *ddata = to_panel_data(dssdev);
169 struct omap_dss_device *in = ddata->in;
170
171 return in->ops.hdmi->set_infoframe(in, avi);
172 }
173
tpd_set_hdmi_mode(struct omap_dss_device * dssdev,bool hdmi_mode)174 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
175 bool hdmi_mode)
176 {
177 struct panel_drv_data *ddata = to_panel_data(dssdev);
178 struct omap_dss_device *in = ddata->in;
179
180 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
181 }
182
183 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
184 .connect = tpd_connect,
185 .disconnect = tpd_disconnect,
186
187 .enable = tpd_enable,
188 .disable = tpd_disable,
189
190 .check_timings = tpd_check_timings,
191 .set_timings = tpd_set_timings,
192 .get_timings = tpd_get_timings,
193
194 .read_edid = tpd_read_edid,
195 .detect = tpd_detect,
196 .set_infoframe = tpd_set_infoframe,
197 .set_hdmi_mode = tpd_set_hdmi_mode,
198 };
199
tpd_probe_of(struct platform_device * pdev)200 static int tpd_probe_of(struct platform_device *pdev)
201 {
202 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
203 struct device_node *node = pdev->dev.of_node;
204 struct omap_dss_device *in;
205
206 in = omapdss_of_find_source_for_first_ep(node);
207 if (IS_ERR(in)) {
208 dev_err(&pdev->dev, "failed to find video source\n");
209 return PTR_ERR(in);
210 }
211
212 ddata->in = in;
213
214 return 0;
215 }
216
tpd_probe(struct platform_device * pdev)217 static int tpd_probe(struct platform_device *pdev)
218 {
219 struct omap_dss_device *in, *dssdev;
220 struct panel_drv_data *ddata;
221 int r;
222 struct gpio_desc *gpio;
223
224 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
225 if (!ddata)
226 return -ENOMEM;
227
228 platform_set_drvdata(pdev, ddata);
229
230 if (!pdev->dev.of_node)
231 return -ENODEV;
232
233 r = tpd_probe_of(pdev);
234 if (r)
235 return r;
236
237
238 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
239 GPIOD_OUT_LOW);
240 if (IS_ERR(gpio))
241 goto err_gpio;
242
243 ddata->ct_cp_hpd_gpio = gpio;
244
245 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
246 GPIOD_OUT_LOW);
247 if (IS_ERR(gpio))
248 goto err_gpio;
249
250 ddata->ls_oe_gpio = gpio;
251
252 gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
253 GPIOD_IN);
254 if (IS_ERR(gpio))
255 goto err_gpio;
256
257 ddata->hpd_gpio = gpio;
258
259 dssdev = &ddata->dssdev;
260 dssdev->ops.hdmi = &tpd_hdmi_ops;
261 dssdev->dev = &pdev->dev;
262 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
263 dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
264 dssdev->owner = THIS_MODULE;
265 dssdev->port_num = 1;
266
267 in = ddata->in;
268
269 r = omapdss_register_output(dssdev);
270 if (r) {
271 dev_err(&pdev->dev, "Failed to register output\n");
272 goto err_reg;
273 }
274
275 return 0;
276 err_reg:
277 err_gpio:
278 omap_dss_put_device(ddata->in);
279 return r;
280 }
281
tpd_remove(struct platform_device * pdev)282 static int __exit tpd_remove(struct platform_device *pdev)
283 {
284 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
285 struct omap_dss_device *dssdev = &ddata->dssdev;
286 struct omap_dss_device *in = ddata->in;
287
288 omapdss_unregister_output(&ddata->dssdev);
289
290 WARN_ON(omapdss_device_is_enabled(dssdev));
291 if (omapdss_device_is_enabled(dssdev))
292 tpd_disable(dssdev);
293
294 WARN_ON(omapdss_device_is_connected(dssdev));
295 if (omapdss_device_is_connected(dssdev))
296 tpd_disconnect(dssdev, dssdev->dst);
297
298 omap_dss_put_device(in);
299
300 return 0;
301 }
302
303 static const struct of_device_id tpd_of_match[] = {
304 { .compatible = "omapdss,ti,tpd12s015", },
305 {},
306 };
307
308 MODULE_DEVICE_TABLE(of, tpd_of_match);
309
310 static struct platform_driver tpd_driver = {
311 .probe = tpd_probe,
312 .remove = __exit_p(tpd_remove),
313 .driver = {
314 .name = "tpd12s015",
315 .of_match_table = tpd_of_match,
316 .suppress_bind_attrs = true,
317 },
318 };
319
320 module_platform_driver(tpd_driver);
321
322 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
323 MODULE_DESCRIPTION("TPD12S015 driver");
324 MODULE_LICENSE("GPL");
325