1 /*
2 * Generic MIPI DPI Panel Driver
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
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/consumer.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/regulator/consumer.h>
18 #include <linux/backlight.h>
19
20 #include <video/of_display_timing.h>
21
22 #include "../dss/omapdss.h"
23
24 struct panel_drv_data {
25 struct omap_dss_device dssdev;
26 struct omap_dss_device *in;
27
28 struct videomode vm;
29
30 struct backlight_device *backlight;
31
32 struct gpio_desc *enable_gpio;
33 struct regulator *vcc_supply;
34 };
35
36 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
37
panel_dpi_connect(struct omap_dss_device * dssdev)38 static int panel_dpi_connect(struct omap_dss_device *dssdev)
39 {
40 struct panel_drv_data *ddata = to_panel_data(dssdev);
41 struct omap_dss_device *in;
42 int r;
43
44 if (omapdss_device_is_connected(dssdev))
45 return 0;
46
47 in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
48 if (IS_ERR(in)) {
49 dev_err(dssdev->dev, "failed to find video source\n");
50 return PTR_ERR(in);
51 }
52
53 r = in->ops.dpi->connect(in, dssdev);
54 if (r) {
55 omap_dss_put_device(in);
56 return r;
57 }
58
59 ddata->in = in;
60 return 0;
61 }
62
panel_dpi_disconnect(struct omap_dss_device * dssdev)63 static void panel_dpi_disconnect(struct omap_dss_device *dssdev)
64 {
65 struct panel_drv_data *ddata = to_panel_data(dssdev);
66 struct omap_dss_device *in = ddata->in;
67
68 if (!omapdss_device_is_connected(dssdev))
69 return;
70
71 in->ops.dpi->disconnect(in, dssdev);
72
73 omap_dss_put_device(in);
74 ddata->in = NULL;
75 }
76
panel_dpi_enable(struct omap_dss_device * dssdev)77 static int panel_dpi_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 (!omapdss_device_is_connected(dssdev))
84 return -ENODEV;
85
86 if (omapdss_device_is_enabled(dssdev))
87 return 0;
88
89 in->ops.dpi->set_timings(in, &ddata->vm);
90
91 r = in->ops.dpi->enable(in);
92 if (r)
93 return r;
94
95 r = regulator_enable(ddata->vcc_supply);
96 if (r) {
97 in->ops.dpi->disable(in);
98 return r;
99 }
100
101 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
102 backlight_enable(ddata->backlight);
103
104 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
105
106 return 0;
107 }
108
panel_dpi_disable(struct omap_dss_device * dssdev)109 static void panel_dpi_disable(struct omap_dss_device *dssdev)
110 {
111 struct panel_drv_data *ddata = to_panel_data(dssdev);
112 struct omap_dss_device *in = ddata->in;
113
114 if (!omapdss_device_is_enabled(dssdev))
115 return;
116
117 backlight_disable(ddata->backlight);
118
119 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
120 regulator_disable(ddata->vcc_supply);
121
122 in->ops.dpi->disable(in);
123
124 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
125 }
126
panel_dpi_set_timings(struct omap_dss_device * dssdev,struct videomode * vm)127 static void panel_dpi_set_timings(struct omap_dss_device *dssdev,
128 struct videomode *vm)
129 {
130 struct panel_drv_data *ddata = to_panel_data(dssdev);
131 struct omap_dss_device *in = ddata->in;
132
133 ddata->vm = *vm;
134 dssdev->panel.vm = *vm;
135
136 in->ops.dpi->set_timings(in, vm);
137 }
138
panel_dpi_get_timings(struct omap_dss_device * dssdev,struct videomode * vm)139 static void panel_dpi_get_timings(struct omap_dss_device *dssdev,
140 struct videomode *vm)
141 {
142 struct panel_drv_data *ddata = to_panel_data(dssdev);
143
144 *vm = ddata->vm;
145 }
146
panel_dpi_check_timings(struct omap_dss_device * dssdev,struct videomode * vm)147 static int panel_dpi_check_timings(struct omap_dss_device *dssdev,
148 struct videomode *vm)
149 {
150 struct panel_drv_data *ddata = to_panel_data(dssdev);
151 struct omap_dss_device *in = ddata->in;
152
153 return in->ops.dpi->check_timings(in, vm);
154 }
155
156 static struct omap_dss_driver panel_dpi_ops = {
157 .connect = panel_dpi_connect,
158 .disconnect = panel_dpi_disconnect,
159
160 .enable = panel_dpi_enable,
161 .disable = panel_dpi_disable,
162
163 .set_timings = panel_dpi_set_timings,
164 .get_timings = panel_dpi_get_timings,
165 .check_timings = panel_dpi_check_timings,
166 };
167
panel_dpi_probe_of(struct platform_device * pdev)168 static int panel_dpi_probe_of(struct platform_device *pdev)
169 {
170 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
171 struct device_node *node = pdev->dev.of_node;
172 int r;
173 struct display_timing timing;
174 struct gpio_desc *gpio;
175
176 gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
177 if (IS_ERR(gpio))
178 return PTR_ERR(gpio);
179
180 ddata->enable_gpio = gpio;
181
182 /*
183 * Many different panels are supported by this driver and there are
184 * probably very different needs for their reset pins in regards to
185 * timing and order relative to the enable gpio. So for now it's just
186 * ensured that the reset line isn't active.
187 */
188 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
189 if (IS_ERR(gpio))
190 return PTR_ERR(gpio);
191
192 ddata->vcc_supply = devm_regulator_get(&pdev->dev, "vcc");
193 if (IS_ERR(ddata->vcc_supply))
194 return PTR_ERR(ddata->vcc_supply);
195
196 ddata->backlight = devm_of_find_backlight(&pdev->dev);
197
198 if (IS_ERR(ddata->backlight))
199 return PTR_ERR(ddata->backlight);
200
201 r = of_get_display_timing(node, "panel-timing", &timing);
202 if (r) {
203 dev_err(&pdev->dev, "failed to get video timing\n");
204 return r;
205 }
206
207 videomode_from_timing(&timing, &ddata->vm);
208
209 return 0;
210 }
211
panel_dpi_probe(struct platform_device * pdev)212 static int panel_dpi_probe(struct platform_device *pdev)
213 {
214 struct panel_drv_data *ddata;
215 struct omap_dss_device *dssdev;
216 int r;
217
218 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
219 if (ddata == NULL)
220 return -ENOMEM;
221
222 platform_set_drvdata(pdev, ddata);
223
224 r = panel_dpi_probe_of(pdev);
225 if (r)
226 return r;
227
228 dssdev = &ddata->dssdev;
229 dssdev->dev = &pdev->dev;
230 dssdev->driver = &panel_dpi_ops;
231 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
232 dssdev->owner = THIS_MODULE;
233 dssdev->panel.vm = ddata->vm;
234
235 r = omapdss_register_display(dssdev);
236 if (r) {
237 dev_err(&pdev->dev, "Failed to register panel\n");
238 return r;
239 }
240
241 return 0;
242 }
243
panel_dpi_remove(struct platform_device * pdev)244 static int __exit panel_dpi_remove(struct platform_device *pdev)
245 {
246 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
247 struct omap_dss_device *dssdev = &ddata->dssdev;
248
249 omapdss_unregister_display(dssdev);
250
251 panel_dpi_disable(dssdev);
252 panel_dpi_disconnect(dssdev);
253
254 return 0;
255 }
256
257 static const struct of_device_id panel_dpi_of_match[] = {
258 { .compatible = "omapdss,panel-dpi", },
259 {},
260 };
261
262 MODULE_DEVICE_TABLE(of, panel_dpi_of_match);
263
264 static struct platform_driver panel_dpi_driver = {
265 .probe = panel_dpi_probe,
266 .remove = __exit_p(panel_dpi_remove),
267 .driver = {
268 .name = "panel-dpi",
269 .of_match_table = panel_dpi_of_match,
270 .suppress_bind_attrs = true,
271 },
272 };
273
274 module_platform_driver(panel_dpi_driver);
275
276 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
277 MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver");
278 MODULE_LICENSE("GPL");
279