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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
23struct 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
39static 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
55static 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
66static 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 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
87
88 if (gpio_is_valid(ddata->backlight_gpio))
89 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
90
91 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
92
93 return 0;
94}
95
96static void panel_dpi_disable(struct omap_dss_device *dssdev)
97{
98 struct panel_drv_data *ddata = to_panel_data(dssdev);
99 struct omap_dss_device *in = ddata->in;
100
101 if (!omapdss_device_is_enabled(dssdev))
102 return;
103
104 if (gpio_is_valid(ddata->backlight_gpio))
105 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
106
107 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
108
109 in->ops.dpi->disable(in);
110
111 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
112}
113
114static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
115 struct omap_video_timings *timings)
116{
117 struct panel_drv_data *ddata = to_panel_data(dssdev);
118 struct omap_dss_device *in = ddata->in;
119
120 ddata->videomode = *timings;
121 dssdev->panel.timings = *timings;
122
123 in->ops.dpi->set_timings(in, timings);
124}
125
126static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
127 struct omap_video_timings *timings)
128{
129 struct panel_drv_data *ddata = to_panel_data(dssdev);
130
131 *timings = ddata->videomode;
132}
133
134static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
135 struct omap_video_timings *timings)
136{
137 struct panel_drv_data *ddata = to_panel_data(dssdev);
138 struct omap_dss_device *in = ddata->in;
139
140 return in->ops.dpi->check_timings(in, timings);
141}
142
143static struct omap_dss_driver panel_dpi_ops = {
144 .connect = panel_dpi_connect,
145 .disconnect = panel_dpi_disconnect,
146
147 .enable = panel_dpi_enable,
148 .disable = panel_dpi_disable,
149
150 .set_timings = panel_dpi_set_timings,
151 .get_timings = panel_dpi_get_timings,
152 .check_timings = panel_dpi_check_timings,
153
154 .get_resolution = omapdss_default_get_resolution,
155};
156
157static int panel_dpi_probe_pdata(struct platform_device *pdev)
158{
159 const struct panel_dpi_platform_data *pdata;
160 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
161 struct omap_dss_device *dssdev, *in;
162 struct videomode vm;
163 int r;
164
165 pdata = dev_get_platdata(&pdev->dev);
166
167 in = omap_dss_find_output(pdata->source);
168 if (in == NULL) {
169 dev_err(&pdev->dev, "failed to find video source '%s'\n",
170 pdata->source);
171 return -EPROBE_DEFER;
172 }
173
174 ddata->in = in;
175
176 ddata->data_lines = pdata->data_lines;
177
178 videomode_from_timing(pdata->display_timing, &vm);
179 videomode_to_omap_video_timings(&vm, &ddata->videomode);
180
181 dssdev = &ddata->dssdev;
182 dssdev->name = pdata->name;
183
184 r = devm_gpio_request_one(&pdev->dev, pdata->enable_gpio,
185 GPIOF_OUT_INIT_LOW, "panel enable");
186 if (r)
187 goto err_gpio;
188
189 ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
190
191 ddata->backlight_gpio = pdata->backlight_gpio;
192
193 return 0;
194
195err_gpio:
196 omap_dss_put_device(ddata->in);
197 return r;
198}
199
200static int panel_dpi_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 int r;
206 struct display_timing timing;
207 struct videomode vm;
208 struct gpio_desc *gpio;
209
210 gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
211 if (IS_ERR(gpio))
212 return PTR_ERR(gpio);
213
214 ddata->enable_gpio = gpio;
215
216 ddata->backlight_gpio = -ENOENT;
217
218 r = of_get_display_timing(node, "panel-timing", &timing);
219 if (r) {
220 dev_err(&pdev->dev, "failed to get video timing\n");
221 return r;
222 }
223
224 videomode_from_timing(&timing, &vm);
225 videomode_to_omap_video_timings(&vm, &ddata->videomode);
226
227 in = omapdss_of_find_source_for_first_ep(node);
228 if (IS_ERR(in)) {
229 dev_err(&pdev->dev, "failed to find video source\n");
230 return PTR_ERR(in);
231 }
232
233 ddata->in = in;
234
235 return 0;
236}
237
238static int panel_dpi_probe(struct platform_device *pdev)
239{
240 struct panel_drv_data *ddata;
241 struct omap_dss_device *dssdev;
242 int r;
243
244 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
245 if (ddata == NULL)
246 return -ENOMEM;
247
248 platform_set_drvdata(pdev, ddata);
249
250 if (dev_get_platdata(&pdev->dev)) {
251 r = panel_dpi_probe_pdata(pdev);
252 if (r)
253 return r;
254 } else if (pdev->dev.of_node) {
255 r = panel_dpi_probe_of(pdev);
256 if (r)
257 return r;
258 } else {
259 return -ENODEV;
260 }
261
262 if (gpio_is_valid(ddata->backlight_gpio)) {
263 r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio,
264 GPIOF_OUT_INIT_LOW, "panel backlight");
265 if (r)
266 goto err_gpio;
267 }
268
269 dssdev = &ddata->dssdev;
270 dssdev->dev = &pdev->dev;
271 dssdev->driver = &panel_dpi_ops;
272 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
273 dssdev->owner = THIS_MODULE;
274 dssdev->panel.timings = ddata->videomode;
275 dssdev->phy.dpi.data_lines = ddata->data_lines;
276
277 r = omapdss_register_display(dssdev);
278 if (r) {
279 dev_err(&pdev->dev, "Failed to register panel\n");
280 goto err_reg;
281 }
282
283 return 0;
284
285err_reg:
286err_gpio:
287 omap_dss_put_device(ddata->in);
288 return r;
289}
290
291static int __exit panel_dpi_remove(struct platform_device *pdev)
292{
293 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
294 struct omap_dss_device *dssdev = &ddata->dssdev;
295 struct omap_dss_device *in = ddata->in;
296
297 omapdss_unregister_display(dssdev);
298
299 panel_dpi_disable(dssdev);
300 panel_dpi_disconnect(dssdev);
301
302 omap_dss_put_device(in);
303
304 return 0;
305}
306
307static const struct of_device_id panel_dpi_of_match[] = {
308 { .compatible = "omapdss,panel-dpi", },
309 {},
310};
311
312MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
313
314static struct platform_driver panel_dpi_driver = {
315 .probe = panel_dpi_probe,
316 .remove = __exit_p(panel_dpi_remove),
317 .driver = {
318 .name = "panel-dpi",
319 .of_match_table = panel_dpi_of_match,
320 .suppress_bind_attrs = true,
321 },
322};
323
324module_platform_driver(panel_dpi_driver);
325
326MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
327MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
328MODULE_LICENSE("GPL");