Merge tag 'fbdev-v4.19' of https://github.com/bzolnier/linux
[muen/linux.git] / drivers / video / fbdev / omap2 / omapfb / displays / encoder-tpd12s015.c
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/mod_devicetable.h>
16 #include <linux/slab.h>
17 #include <linux/platform_device.h>
18 #include <linux/gpio/consumer.h>
19
20 #include <video/omapfb_dss.h>
21
22 struct panel_drv_data {
23         struct omap_dss_device dssdev;
24         struct omap_dss_device *in;
25
26         struct gpio_desc *ct_cp_hpd_gpio;
27         struct gpio_desc *ls_oe_gpio;
28         struct gpio_desc *hpd_gpio;
29
30         struct omap_video_timings timings;
31 };
32
33 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
34
35 static int tpd_connect(struct omap_dss_device *dssdev,
36                 struct omap_dss_device *dst)
37 {
38         struct panel_drv_data *ddata = to_panel_data(dssdev);
39         struct omap_dss_device *in = ddata->in;
40         int r;
41
42         r = in->ops.hdmi->connect(in, dssdev);
43         if (r)
44                 return r;
45
46         dst->src = dssdev;
47         dssdev->dst = dst;
48
49         if (ddata->ct_cp_hpd_gpio) {
50                 gpiod_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
55         return 0;
56 }
57
58 static void tpd_disconnect(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
64         WARN_ON(dst != dssdev->dst);
65
66         if (dst != dssdev->dst)
67                 return;
68
69         gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
70
71         dst->src = NULL;
72         dssdev->dst = NULL;
73
74         in->ops.hdmi->disconnect(in, &ddata->dssdev);
75 }
76
77 static int tpd_enable(struct omap_dss_device *dssdev)
78 {
79         struct panel_drv_data *ddata = to_panel_data(dssdev);
80         struct omap_dss_device *in = ddata->in;
81         int r;
82
83         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
84                 return 0;
85
86         in->ops.hdmi->set_timings(in, &ddata->timings);
87
88         r = in->ops.hdmi->enable(in);
89         if (r)
90                 return r;
91
92         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
93
94         return r;
95 }
96
97 static void tpd_disable(struct omap_dss_device *dssdev)
98 {
99         struct panel_drv_data *ddata = to_panel_data(dssdev);
100         struct omap_dss_device *in = ddata->in;
101
102         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
103                 return;
104
105         in->ops.hdmi->disable(in);
106
107         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
108 }
109
110 static void tpd_set_timings(struct omap_dss_device *dssdev,
111                 struct omap_video_timings *timings)
112 {
113         struct panel_drv_data *ddata = to_panel_data(dssdev);
114         struct omap_dss_device *in = ddata->in;
115
116         ddata->timings = *timings;
117         dssdev->panel.timings = *timings;
118
119         in->ops.hdmi->set_timings(in, timings);
120 }
121
122 static void tpd_get_timings(struct omap_dss_device *dssdev,
123                 struct omap_video_timings *timings)
124 {
125         struct panel_drv_data *ddata = to_panel_data(dssdev);
126
127         *timings = ddata->timings;
128 }
129
130 static int tpd_check_timings(struct omap_dss_device *dssdev,
131                 struct omap_video_timings *timings)
132 {
133         struct panel_drv_data *ddata = to_panel_data(dssdev);
134         struct omap_dss_device *in = ddata->in;
135         int r;
136
137         r = in->ops.hdmi->check_timings(in, timings);
138
139         return r;
140 }
141
142 static int tpd_read_edid(struct omap_dss_device *dssdev,
143                 u8 *edid, int len)
144 {
145         struct panel_drv_data *ddata = to_panel_data(dssdev);
146         struct omap_dss_device *in = ddata->in;
147         int r;
148
149         if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
150                 return -ENODEV;
151
152         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
153
154         r = in->ops.hdmi->read_edid(in, edid, len);
155
156         gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
157
158         return r;
159 }
160
161 static bool tpd_detect(struct omap_dss_device *dssdev)
162 {
163         struct panel_drv_data *ddata = to_panel_data(dssdev);
164
165         return gpiod_get_value_cansleep(ddata->hpd_gpio);
166 }
167
168 static int tpd_set_infoframe(struct omap_dss_device *dssdev,
169                 const struct hdmi_avi_infoframe *avi)
170 {
171         struct panel_drv_data *ddata = to_panel_data(dssdev);
172         struct omap_dss_device *in = ddata->in;
173
174         return in->ops.hdmi->set_infoframe(in, avi);
175 }
176
177 static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
178                 bool hdmi_mode)
179 {
180         struct panel_drv_data *ddata = to_panel_data(dssdev);
181         struct omap_dss_device *in = ddata->in;
182
183         return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
184 }
185
186 static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
187         .connect                = tpd_connect,
188         .disconnect             = tpd_disconnect,
189
190         .enable                 = tpd_enable,
191         .disable                = tpd_disable,
192
193         .check_timings          = tpd_check_timings,
194         .set_timings            = tpd_set_timings,
195         .get_timings            = tpd_get_timings,
196
197         .read_edid              = tpd_read_edid,
198         .detect                 = tpd_detect,
199         .set_infoframe          = tpd_set_infoframe,
200         .set_hdmi_mode          = tpd_set_hdmi_mode,
201 };
202
203 static int tpd_probe_of(struct platform_device *pdev)
204 {
205         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
206         struct device_node *node = pdev->dev.of_node;
207         struct omap_dss_device *in;
208
209         in = omapdss_of_find_source_for_first_ep(node);
210         if (IS_ERR(in)) {
211                 dev_err(&pdev->dev, "failed to find video source\n");
212                 return PTR_ERR(in);
213         }
214
215         ddata->in = in;
216
217         return 0;
218 }
219
220 static int tpd_probe(struct platform_device *pdev)
221 {
222         struct omap_dss_device *dssdev;
223         struct panel_drv_data *ddata;
224         int r;
225         struct gpio_desc *gpio;
226
227         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
228         if (!ddata)
229                 return -ENOMEM;
230
231         platform_set_drvdata(pdev, ddata);
232
233         if (pdev->dev.of_node) {
234                 r = tpd_probe_of(pdev);
235                 if (r)
236                         return r;
237         } else {
238                 return -ENODEV;
239         }
240
241         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
242                 GPIOD_OUT_LOW);
243         if (IS_ERR(gpio)) {
244                 r = PTR_ERR(gpio);
245                 goto err_gpio;
246         }
247
248         ddata->ct_cp_hpd_gpio = gpio;
249
250         gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
251                 GPIOD_OUT_LOW);
252         if (IS_ERR(gpio)) {
253                 r = PTR_ERR(gpio);
254                 goto err_gpio;
255         }
256
257         ddata->ls_oe_gpio = gpio;
258
259         gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
260                 GPIOD_IN);
261         if (IS_ERR(gpio)) {
262                 r = PTR_ERR(gpio);
263                 goto err_gpio;
264         }
265
266         ddata->hpd_gpio = gpio;
267
268         dssdev = &ddata->dssdev;
269         dssdev->ops.hdmi = &tpd_hdmi_ops;
270         dssdev->dev = &pdev->dev;
271         dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
272         dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
273         dssdev->owner = THIS_MODULE;
274         dssdev->port_num = 1;
275
276         r = omapdss_register_output(dssdev);
277         if (r) {
278                 dev_err(&pdev->dev, "Failed to register output\n");
279                 goto err_reg;
280         }
281
282         return 0;
283 err_reg:
284 err_gpio:
285         omap_dss_put_device(ddata->in);
286         return r;
287 }
288
289 static int __exit tpd_remove(struct platform_device *pdev)
290 {
291         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
292         struct omap_dss_device *dssdev = &ddata->dssdev;
293         struct omap_dss_device *in = ddata->in;
294
295         omapdss_unregister_output(&ddata->dssdev);
296
297         WARN_ON(omapdss_device_is_enabled(dssdev));
298         if (omapdss_device_is_enabled(dssdev))
299                 tpd_disable(dssdev);
300
301         WARN_ON(omapdss_device_is_connected(dssdev));
302         if (omapdss_device_is_connected(dssdev))
303                 tpd_disconnect(dssdev, dssdev->dst);
304
305         omap_dss_put_device(in);
306
307         return 0;
308 }
309
310 static const struct of_device_id tpd_of_match[] = {
311         { .compatible = "omapdss,ti,tpd12s015", },
312         {},
313 };
314
315 MODULE_DEVICE_TABLE(of, tpd_of_match);
316
317 static struct platform_driver tpd_driver = {
318         .probe  = tpd_probe,
319         .remove = __exit_p(tpd_remove),
320         .driver = {
321                 .name   = "tpd12s015",
322                 .of_match_table = tpd_of_match,
323                 .suppress_bind_attrs = true,
324         },
325 };
326
327 module_platform_driver(tpd_driver);
328
329 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
330 MODULE_DESCRIPTION("TPD12S015 driver");
331 MODULE_LICENSE("GPL");