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
panel_dpi_connect(struct omap_dss_device * dssdev)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
panel_dpi_disconnect(struct omap_dss_device * dssdev)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
panel_dpi_enable(struct omap_dss_device * dssdev)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
panel_dpi_disable(struct omap_dss_device * dssdev)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
panel_dpi_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)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
panel_dpi_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)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
panel_dpi_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)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
panel_dpi_probe_pdata(struct platform_device * pdev)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
panel_dpi_probe_of(struct platform_device * pdev)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(&pdev->dev, "enable");
213
214 if (IS_ERR(gpio)) {
215 if (PTR_ERR(gpio) != -ENOENT)
216 return PTR_ERR(gpio);
217 else
218 gpio = NULL;
219 } else {
220 gpiod_direction_output(gpio, 0);
221 }
222
223 ddata->enable_gpio = gpio;
224
225 ddata->backlight_gpio = -ENOENT;
226
227 r = of_get_display_timing(node, "panel-timing", &timing);
228 if (r) {
229 dev_err(&pdev->dev, "failed to get video timing\n");
230 return r;
231 }
232
233 videomode_from_timing(&timing, &vm);
234 videomode_to_omap_video_timings(&vm, &ddata->videomode);
235
236 in = omapdss_of_find_source_for_first_ep(node);
237 if (IS_ERR(in)) {
238 dev_err(&pdev->dev, "failed to find video source\n");
239 return PTR_ERR(in);
240 }
241
242 ddata->in = in;
243
244 return 0;
245 }
246
panel_dpi_probe(struct platform_device * pdev)247 static int panel_dpi_probe(struct platform_device *pdev)
248 {
249 struct panel_drv_data *ddata;
250 struct omap_dss_device *dssdev;
251 int r;
252
253 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
254 if (ddata == NULL)
255 return -ENOMEM;
256
257 platform_set_drvdata(pdev, ddata);
258
259 if (dev_get_platdata(&pdev->dev)) {
260 r = panel_dpi_probe_pdata(pdev);
261 if (r)
262 return r;
263 } else if (pdev->dev.of_node) {
264 r = panel_dpi_probe_of(pdev);
265 if (r)
266 return r;
267 } else {
268 return -ENODEV;
269 }
270
271 if (gpio_is_valid(ddata->backlight_gpio)) {
272 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
273 GPIOF_OUT_INIT_LOW, "panel backlight");
274 if (r)
275 goto err_gpio;
276 }
277
278 dssdev = &ddata->dssdev;
279 dssdev->dev = &pdev->dev;
280 dssdev->driver = &panel_dpi_ops;
281 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
282 dssdev->owner = THIS_MODULE;
283 dssdev->panel.timings = ddata->videomode;
284 dssdev->phy.dpi.data_lines = ddata->data_lines;
285
286 r = omapdss_register_display(dssdev);
287 if (r) {
288 dev_err(&pdev->dev, "Failed to register panel\n");
289 goto err_reg;
290 }
291
292 return 0;
293
294 err_reg:
295 err_gpio:
296 omap_dss_put_device(ddata->in);
297 return r;
298 }
299
panel_dpi_remove(struct platform_device * pdev)300 static int __exit panel_dpi_remove(struct platform_device *pdev)
301 {
302 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
303 struct omap_dss_device *dssdev = &ddata->dssdev;
304 struct omap_dss_device *in = ddata->in;
305
306 omapdss_unregister_display(dssdev);
307
308 panel_dpi_disable(dssdev);
309 panel_dpi_disconnect(dssdev);
310
311 omap_dss_put_device(in);
312
313 return 0;
314 }
315
316 static const struct of_device_id panel_dpi_of_match[] = {
317 { .compatible = "omapdss,panel-dpi", },
318 {},
319 };
320
321 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
322
323 static struct platform_driver panel_dpi_driver = {
324 .probe = panel_dpi_probe,
325 .remove = __exit_p(panel_dpi_remove),
326 .driver = {
327 .name = "panel-dpi",
328 .of_match_table = panel_dpi_of_match,
329 .suppress_bind_attrs = true,
330 },
331 };
332
333 module_platform_driver(panel_dpi_driver);
334
335 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
336 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
337 MODULE_LICENSE("GPL");
338