1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TPD12S015 HDMI ESD protection & level shifter chip driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9 #include <linux/completion.h>
10 #include <linux/delay.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/platform_device.h>
14 #include <linux/gpio/consumer.h>
15
16 #include <video/omapfb_dss.h>
17
18 struct panel_drv_data {
19 struct omap_dss_device dssdev;
20 struct omap_dss_device *in;
21
22 struct gpio_desc *ct_cp_hpd_gpio;
23 struct gpio_desc *ls_oe_gpio;
24 struct gpio_desc *hpd_gpio;
25
26 struct omap_video_timings timings;
27 };
28
29 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
30
tpd_connect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)31 static int tpd_connect(struct omap_dss_device *dssdev,
32 struct omap_dss_device *dst)
33 {
34 struct panel_drv_data *ddata = to_panel_data(dssdev);
35 struct omap_dss_device *in = ddata->in;
36 int r;
37
38 r = in->ops.hdmi->connect(in, dssdev);
39 if (r)
40 return r;
41
42 dst->src = dssdev;
43 dssdev->dst = dst;
44
45 if (ddata->ct_cp_hpd_gpio) {
46 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
47 /* DC-DC converter needs at max 300us to get to 90% of 5V */
48 udelay(300);
49 }
50
51 return 0;
52 }
53
tpd_disconnect(struct omap_dss_device * dssdev,struct omap_dss_device * dst)54 static void tpd_disconnect(struct omap_dss_device *dssdev,
55 struct omap_dss_device *dst)
56 {
57 struct panel_drv_data *ddata = to_panel_data(dssdev);
58 struct omap_dss_device *in = ddata->in;
59
60 WARN_ON(dst != dssdev->dst);
61
62 if (dst != dssdev->dst)
63 return;
64
65 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
66
67 dst->src = NULL;
68 dssdev->dst = NULL;
69
70 in->ops.hdmi->disconnect(in, &ddata->dssdev);
71 }
72
tpd_enable(struct omap_dss_device * dssdev)73 static int tpd_enable(struct omap_dss_device *dssdev)
74 {
75 struct panel_drv_data *ddata = to_panel_data(dssdev);
76 struct omap_dss_device *in = ddata->in;
77 int r;
78
79 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
80 return 0;
81
82 in->ops.hdmi->set_timings(in, &ddata->timings);
83
84 r = in->ops.hdmi->enable(in);
85 if (r)
86 return r;
87
88 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
89
90 return r;
91 }
92
tpd_disable(struct omap_dss_device * dssdev)93 static void tpd_disable(struct omap_dss_device *dssdev)
94 {
95 struct panel_drv_data *ddata = to_panel_data(dssdev);
96 struct omap_dss_device *in = ddata->in;
97
98 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
99 return;
100
101 in->ops.hdmi->disable(in);
102
103 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
104 }
105
tpd_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)106 static void tpd_set_timings(struct omap_dss_device *dssdev,
107 struct omap_video_timings *timings)
108 {
109 struct panel_drv_data *ddata = to_panel_data(dssdev);
110 struct omap_dss_device *in = ddata->in;
111
112 ddata->timings = *timings;
113 dssdev->panel.timings = *timings;
114
115 in->ops.hdmi->set_timings(in, timings);
116 }
117
tpd_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)118 static void tpd_get_timings(struct omap_dss_device *dssdev,
119 struct omap_video_timings *timings)
120 {
121 struct panel_drv_data *ddata = to_panel_data(dssdev);
122
123 *timings = ddata->timings;
124 }
125
tpd_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)126 static int tpd_check_timings(struct omap_dss_device *dssdev,
127 struct omap_video_timings *timings)
128 {
129 struct panel_drv_data *ddata = to_panel_data(dssdev);
130 struct omap_dss_device *in = ddata->in;
131 int r;
132
133 r = in->ops.hdmi->check_timings(in, timings);
134
135 return r;
136 }
137
tpd_read_edid(struct omap_dss_device * dssdev,u8 * edid,int len)138 static int tpd_read_edid(struct omap_dss_device *dssdev,
139 u8 *edid, int len)
140 {
141 struct panel_drv_data *ddata = to_panel_data(dssdev);
142 struct omap_dss_device *in = ddata->in;
143 int r;
144
145 if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
146 return -ENODEV;
147
148 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
149
150 r = in->ops.hdmi->read_edid(in, edid, len);
151
152 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
153
154 return r;
155 }
156
tpd_detect(struct omap_dss_device * dssdev)157 static bool tpd_detect(struct omap_dss_device *dssdev)
158 {
159 struct panel_drv_data *ddata = to_panel_data(dssdev);
160
161 return gpiod_get_value_cansleep(ddata->hpd_gpio);
162 }
163
tpd_set_infoframe(struct omap_dss_device * dssdev,const struct hdmi_avi_infoframe * avi)164 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
165 const struct hdmi_avi_infoframe *avi)
166 {
167 struct panel_drv_data *ddata = to_panel_data(dssdev);
168 struct omap_dss_device *in = ddata->in;
169
170 return in->ops.hdmi->set_infoframe(in, avi);
171 }
172
tpd_set_hdmi_mode(struct omap_dss_device * dssdev,bool hdmi_mode)173 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
174 bool hdmi_mode)
175 {
176 struct panel_drv_data *ddata = to_panel_data(dssdev);
177 struct omap_dss_device *in = ddata->in;
178
179 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
180 }
181
182 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
183 .connect = tpd_connect,
184 .disconnect = tpd_disconnect,
185
186 .enable = tpd_enable,
187 .disable = tpd_disable,
188
189 .check_timings = tpd_check_timings,
190 .set_timings = tpd_set_timings,
191 .get_timings = tpd_get_timings,
192
193 .read_edid = tpd_read_edid,
194 .detect = tpd_detect,
195 .set_infoframe = tpd_set_infoframe,
196 .set_hdmi_mode = tpd_set_hdmi_mode,
197 };
198
tpd_probe_of(struct platform_device * pdev)199 static int tpd_probe_of(struct platform_device *pdev)
200 {
201 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
202 struct device_node *node = pdev->dev.of_node;
203 struct omap_dss_device *in;
204
205 in = omapdss_of_find_source_for_first_ep(node);
206 if (IS_ERR(in)) {
207 dev_err(&pdev->dev, "failed to find video source\n");
208 return PTR_ERR(in);
209 }
210
211 ddata->in = in;
212
213 return 0;
214 }
215
tpd_probe(struct platform_device * pdev)216 static int tpd_probe(struct platform_device *pdev)
217 {
218 struct omap_dss_device *dssdev;
219 struct panel_drv_data *ddata;
220 int r;
221 struct gpio_desc *gpio;
222
223 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
224 if (!ddata)
225 return -ENOMEM;
226
227 platform_set_drvdata(pdev, ddata);
228
229 if (pdev->dev.of_node) {
230 r = tpd_probe_of(pdev);
231 if (r)
232 return r;
233 } else {
234 return -ENODEV;
235 }
236
237 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
238 GPIOD_OUT_LOW);
239 if (IS_ERR(gpio)) {
240 r = PTR_ERR(gpio);
241 goto err_gpio;
242 }
243
244 ddata->ct_cp_hpd_gpio = gpio;
245
246 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
247 GPIOD_OUT_LOW);
248 if (IS_ERR(gpio)) {
249 r = PTR_ERR(gpio);
250 goto err_gpio;
251 }
252
253 ddata->ls_oe_gpio = gpio;
254
255 gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
256 GPIOD_IN);
257 if (IS_ERR(gpio)) {
258 r = PTR_ERR(gpio);
259 goto err_gpio;
260 }
261
262 ddata->hpd_gpio = gpio;
263
264 dssdev = &ddata->dssdev;
265 dssdev->ops.hdmi = &tpd_hdmi_ops;
266 dssdev->dev = &pdev->dev;
267 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
268 dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
269 dssdev->owner = THIS_MODULE;
270 dssdev->port_num = 1;
271
272 r = omapdss_register_output(dssdev);
273 if (r) {
274 dev_err(&pdev->dev, "Failed to register output\n");
275 goto err_reg;
276 }
277
278 return 0;
279 err_reg:
280 err_gpio:
281 omap_dss_put_device(ddata->in);
282 return r;
283 }
284
tpd_remove(struct platform_device * pdev)285 static void tpd_remove(struct platform_device *pdev)
286 {
287 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
288 struct omap_dss_device *dssdev = &ddata->dssdev;
289 struct omap_dss_device *in = ddata->in;
290
291 omapdss_unregister_output(&ddata->dssdev);
292
293 WARN_ON(omapdss_device_is_enabled(dssdev));
294 if (omapdss_device_is_enabled(dssdev))
295 tpd_disable(dssdev);
296
297 WARN_ON(omapdss_device_is_connected(dssdev));
298 if (omapdss_device_is_connected(dssdev))
299 tpd_disconnect(dssdev, dssdev->dst);
300
301 omap_dss_put_device(in);
302 }
303
304 static const struct of_device_id tpd_of_match[] = {
305 { .compatible = "omapdss,ti,tpd12s015", },
306 {},
307 };
308
309 MODULE_DEVICE_TABLE(of, tpd_of_match);
310
311 static struct platform_driver tpd_driver = {
312 .probe = tpd_probe,
313 .remove = tpd_remove,
314 .driver = {
315 .name = "tpd12s015",
316 .of_match_table = tpd_of_match,
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