These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / video / fbdev / omap2 / displays-new / panel-dpi.c
1 /*
2  * Generic MIPI DPI Panel 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/gpio.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/of.h>
17 #include <linux/of_gpio.h>
18
19 #include <video/omapdss.h>
20 #include <video/omap-panel-data.h>
21 #include <video/of_display_timing.h>
22
23 struct panel_drv_data {
24         struct omap_dss_device dssdev;
25         struct omap_dss_device *in;
26
27         int data_lines;
28
29         struct omap_video_timings videomode;
30
31         /* used for non-DT boot, to be removed */
32         int backlight_gpio;
33
34         struct gpio_desc *enable_gpio;
35 };
36
37 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
38
39 static int panel_dpi_connect(struct omap_dss_device *dssdev)
40 {
41         struct panel_drv_data *ddata = to_panel_data(dssdev);
42         struct omap_dss_device *in = ddata->in;
43         int r;
44
45         if (omapdss_device_is_connected(dssdev))
46                 return 0;
47
48         r = in->ops.dpi->connect(in, dssdev);
49         if (r)
50                 return r;
51
52         return 0;
53 }
54
55 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
56 {
57         struct panel_drv_data *ddata = to_panel_data(dssdev);
58         struct omap_dss_device *in = ddata->in;
59
60         if (!omapdss_device_is_connected(dssdev))
61                 return;
62
63         in->ops.dpi->disconnect(in, dssdev);
64 }
65
66 static int panel_dpi_enable(struct omap_dss_device *dssdev)
67 {
68         struct panel_drv_data *ddata = to_panel_data(dssdev);
69         struct omap_dss_device *in = ddata->in;
70         int r;
71
72         if (!omapdss_device_is_connected(dssdev))
73                 return -ENODEV;
74
75         if (omapdss_device_is_enabled(dssdev))
76                 return 0;
77
78         if (ddata->data_lines)
79                 in->ops.dpi->set_data_lines(in, ddata->data_lines);
80         in->ops.dpi->set_timings(in, &ddata->videomode);
81
82         r = in->ops.dpi->enable(in);
83         if (r)
84                 return r;
85
86         if (ddata->enable_gpio)
87                 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
88
89         if (gpio_is_valid(ddata->backlight_gpio))
90                 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
91
92         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
93
94         return 0;
95 }
96
97 static void panel_dpi_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 (!omapdss_device_is_enabled(dssdev))
103                 return;
104
105         if (ddata->enable_gpio)
106                 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
107
108         if (gpio_is_valid(ddata->backlight_gpio))
109                 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
110
111         in->ops.dpi->disable(in);
112
113         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
114 }
115
116 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
117                 struct omap_video_timings *timings)
118 {
119         struct panel_drv_data *ddata = to_panel_data(dssdev);
120         struct omap_dss_device *in = ddata->in;
121
122         ddata->videomode = *timings;
123         dssdev->panel.timings = *timings;
124
125         in->ops.dpi->set_timings(in, timings);
126 }
127
128 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
129                 struct omap_video_timings *timings)
130 {
131         struct panel_drv_data *ddata = to_panel_data(dssdev);
132
133         *timings = ddata->videomode;
134 }
135
136 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
137                 struct omap_video_timings *timings)
138 {
139         struct panel_drv_data *ddata = to_panel_data(dssdev);
140         struct omap_dss_device *in = ddata->in;
141
142         return in->ops.dpi->check_timings(in, timings);
143 }
144
145 static struct omap_dss_driver panel_dpi_ops = {
146         .connect        = panel_dpi_connect,
147         .disconnect     = panel_dpi_disconnect,
148
149         .enable         = panel_dpi_enable,
150         .disable        = panel_dpi_disable,
151
152         .set_timings    = panel_dpi_set_timings,
153         .get_timings    = panel_dpi_get_timings,
154         .check_timings  = panel_dpi_check_timings,
155
156         .get_resolution = omapdss_default_get_resolution,
157 };
158
159 static int panel_dpi_probe_pdata(struct platform_device *pdev)
160 {
161         const struct panel_dpi_platform_data *pdata;
162         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
163         struct omap_dss_device *dssdev, *in;
164         struct videomode vm;
165         int r;
166
167         pdata = dev_get_platdata(&pdev->dev);
168
169         in = omap_dss_find_output(pdata->source);
170         if (in == NULL) {
171                 dev_err(&pdev->dev, "failed to find video source '%s'\n",
172                                 pdata->source);
173                 return -EPROBE_DEFER;
174         }
175
176         ddata->in = in;
177
178         ddata->data_lines = pdata->data_lines;
179
180         videomode_from_timing(pdata->display_timing, &vm);
181         videomode_to_omap_video_timings(&vm, &ddata->videomode);
182
183         dssdev = &ddata->dssdev;
184         dssdev->name = pdata->name;
185
186         r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
187                                         GPIOF_OUT_INIT_LOW, "panel enable");
188         if (r)
189                 goto err_gpio;
190
191         ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
192
193         ddata->backlight_gpio = pdata->backlight_gpio;
194
195         return 0;
196
197 err_gpio:
198         omap_dss_put_device(ddata->in);
199         return r;
200 }
201
202 static int panel_dpi_probe_of(struct platform_device *pdev)
203 {
204         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
205         struct device_node *node = pdev->dev.of_node;
206         struct omap_dss_device *in;
207         int r;
208         struct display_timing timing;
209         struct videomode vm;
210         struct gpio_desc *gpio;
211
212         gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
213         if (IS_ERR(gpio))
214                 return PTR_ERR(gpio);
215
216         ddata->enable_gpio = gpio;
217
218         ddata->backlight_gpio = -ENOENT;
219
220         r = of_get_display_timing(node, "panel-timing", &timing);
221         if (r) {
222                 dev_err(&pdev->dev, "failed to get video timing\n");
223                 return r;
224         }
225
226         videomode_from_timing(&timing, &vm);
227         videomode_to_omap_video_timings(&vm, &ddata->videomode);
228
229         in = omapdss_of_find_source_for_first_ep(node);
230         if (IS_ERR(in)) {
231                 dev_err(&pdev->dev, "failed to find video source\n");
232                 return PTR_ERR(in);
233         }
234
235         ddata->in = in;
236
237         return 0;
238 }
239
240 static int panel_dpi_probe(struct platform_device *pdev)
241 {
242         struct panel_drv_data *ddata;
243         struct omap_dss_device *dssdev;
244         int r;
245
246         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
247         if (ddata == NULL)
248                 return -ENOMEM;
249
250         platform_set_drvdata(pdev, ddata);
251
252         if (dev_get_platdata(&pdev->dev)) {
253                 r = panel_dpi_probe_pdata(pdev);
254                 if (r)
255                         return r;
256         } else if (pdev->dev.of_node) {
257                 r = panel_dpi_probe_of(pdev);
258                 if (r)
259                         return r;
260         } else {
261                 return -ENODEV;
262         }
263
264         if (gpio_is_valid(ddata->backlight_gpio)) {
265                 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
266                                 GPIOF_OUT_INIT_LOW, "panel backlight");
267                 if (r)
268                         goto err_gpio;
269         }
270
271         dssdev = &ddata->dssdev;
272         dssdev->dev = &pdev->dev;
273         dssdev->driver = &panel_dpi_ops;
274         dssdev->type = OMAP_DISPLAY_TYPE_DPI;
275         dssdev->owner = THIS_MODULE;
276         dssdev->panel.timings = ddata->videomode;
277         dssdev->phy.dpi.data_lines = ddata->data_lines;
278
279         r = omapdss_register_display(dssdev);
280         if (r) {
281                 dev_err(&pdev->dev, "Failed to register panel\n");
282                 goto err_reg;
283         }
284
285         return 0;
286
287 err_reg:
288 err_gpio:
289         omap_dss_put_device(ddata->in);
290         return r;
291 }
292
293 static int __exit panel_dpi_remove(struct platform_device *pdev)
294 {
295         struct panel_drv_data *ddata = platform_get_drvdata(pdev);
296         struct omap_dss_device *dssdev = &ddata->dssdev;
297         struct omap_dss_device *in = ddata->in;
298
299         omapdss_unregister_display(dssdev);
300
301         panel_dpi_disable(dssdev);
302         panel_dpi_disconnect(dssdev);
303
304         omap_dss_put_device(in);
305
306         return 0;
307 }
308
309 static const struct of_device_id panel_dpi_of_match[] = {
310         { .compatible = "omapdss,panel-dpi", },
311         {},
312 };
313
314 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
315
316 static struct platform_driver panel_dpi_driver = {
317         .probe = panel_dpi_probe,
318         .remove = __exit_p(panel_dpi_remove),
319         .driver = {
320                 .name = "panel-dpi",
321                 .of_match_table = panel_dpi_of_match,
322                 .suppress_bind_attrs = true,
323         },
324 };
325
326 module_platform_driver(panel_dpi_driver);
327
328 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
329 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
330 MODULE_LICENSE("GPL");