1 /*
2 * LCD panel driver for Sharp LS037V7DW01
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/delay.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/slab.h>
18 #include <linux/regulator/consumer.h>
19
20 #include "../dss/omapdss.h"
21
22 struct panel_drv_data {
23 struct omap_dss_device dssdev;
24 struct omap_dss_device *in;
25 struct regulator *vcc;
26
27 struct videomode vm;
28
29 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
30 struct gpio_desc *ini_gpio; /* high = power on */
31 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
32 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
33 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
34 };
35
36 static const struct videomode sharp_ls_vm = {
37 .hactive = 480,
38 .vactive = 640,
39
40 .pixelclock = 19200000,
41
42 .hsync_len = 2,
43 .hfront_porch = 1,
44 .hback_porch = 28,
45
46 .vsync_len = 1,
47 .vfront_porch = 1,
48 .vback_porch = 1,
49
50 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
51 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_SYNC_NEGEDGE |
52 DISPLAY_FLAGS_PIXDATA_POSEDGE,
53 /*
54 * Note: According to the panel documentation:
55 * DATA needs to be driven on the FALLING edge
56 */
57 };
58
59 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
60
sharp_ls_connect(struct omap_dss_device * dssdev)61 static int sharp_ls_connect(struct omap_dss_device *dssdev)
62 {
63 struct panel_drv_data *ddata = to_panel_data(dssdev);
64 struct omap_dss_device *in;
65 int r;
66
67 if (omapdss_device_is_connected(dssdev))
68 return 0;
69
70 in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
71 if (IS_ERR(in)) {
72 dev_err(dssdev->dev, "failed to find video source\n");
73 return PTR_ERR(in);
74 }
75
76 r = in->ops.dpi->connect(in, dssdev);
77 if (r) {
78 omap_dss_put_device(in);
79 return r;
80 }
81
82 ddata->in = in;
83 return 0;
84 }
85
sharp_ls_disconnect(struct omap_dss_device * dssdev)86 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
87 {
88 struct panel_drv_data *ddata = to_panel_data(dssdev);
89 struct omap_dss_device *in = ddata->in;
90
91 if (!omapdss_device_is_connected(dssdev))
92 return;
93
94 in->ops.dpi->disconnect(in, dssdev);
95
96 omap_dss_put_device(in);
97 ddata->in = NULL;
98 }
99
sharp_ls_enable(struct omap_dss_device * dssdev)100 static int sharp_ls_enable(struct omap_dss_device *dssdev)
101 {
102 struct panel_drv_data *ddata = to_panel_data(dssdev);
103 struct omap_dss_device *in = ddata->in;
104 int r;
105
106 if (!omapdss_device_is_connected(dssdev))
107 return -ENODEV;
108
109 if (omapdss_device_is_enabled(dssdev))
110 return 0;
111
112 in->ops.dpi->set_timings(in, &ddata->vm);
113
114 if (ddata->vcc) {
115 r = regulator_enable(ddata->vcc);
116 if (r != 0)
117 return r;
118 }
119
120 r = in->ops.dpi->enable(in);
121 if (r) {
122 regulator_disable(ddata->vcc);
123 return r;
124 }
125
126 /* wait couple of vsyncs until enabling the LCD */
127 msleep(50);
128
129 if (ddata->resb_gpio)
130 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
131
132 if (ddata->ini_gpio)
133 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
134
135 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
136
137 return 0;
138 }
139
sharp_ls_disable(struct omap_dss_device * dssdev)140 static void sharp_ls_disable(struct omap_dss_device *dssdev)
141 {
142 struct panel_drv_data *ddata = to_panel_data(dssdev);
143 struct omap_dss_device *in = ddata->in;
144
145 if (!omapdss_device_is_enabled(dssdev))
146 return;
147
148 if (ddata->ini_gpio)
149 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
150
151 if (ddata->resb_gpio)
152 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
153
154 /* wait at least 5 vsyncs after disabling the LCD */
155
156 msleep(100);
157
158 in->ops.dpi->disable(in);
159
160 if (ddata->vcc)
161 regulator_disable(ddata->vcc);
162
163 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
164 }
165
sharp_ls_set_timings(struct omap_dss_device * dssdev,struct videomode * vm)166 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
167 struct videomode *vm)
168 {
169 struct panel_drv_data *ddata = to_panel_data(dssdev);
170 struct omap_dss_device *in = ddata->in;
171
172 ddata->vm = *vm;
173 dssdev->panel.vm = *vm;
174
175 in->ops.dpi->set_timings(in, vm);
176 }
177
sharp_ls_get_timings(struct omap_dss_device * dssdev,struct videomode * vm)178 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
179 struct videomode *vm)
180 {
181 struct panel_drv_data *ddata = to_panel_data(dssdev);
182
183 *vm = ddata->vm;
184 }
185
sharp_ls_check_timings(struct omap_dss_device * dssdev,struct videomode * vm)186 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
187 struct videomode *vm)
188 {
189 struct panel_drv_data *ddata = to_panel_data(dssdev);
190 struct omap_dss_device *in = ddata->in;
191
192 return in->ops.dpi->check_timings(in, vm);
193 }
194
195 static struct omap_dss_driver sharp_ls_ops = {
196 .connect = sharp_ls_connect,
197 .disconnect = sharp_ls_disconnect,
198
199 .enable = sharp_ls_enable,
200 .disable = sharp_ls_disable,
201
202 .set_timings = sharp_ls_set_timings,
203 .get_timings = sharp_ls_get_timings,
204 .check_timings = sharp_ls_check_timings,
205 };
206
sharp_ls_get_gpio_of(struct device * dev,int index,int val,const char * desc,struct gpio_desc ** gpiod)207 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
208 const char *desc, struct gpio_desc **gpiod)
209 {
210 struct gpio_desc *gd;
211
212 *gpiod = NULL;
213
214 gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
215 if (IS_ERR(gd))
216 return PTR_ERR(gd);
217
218 *gpiod = gd;
219 return 0;
220 }
221
sharp_ls_probe_of(struct platform_device * pdev)222 static int sharp_ls_probe_of(struct platform_device *pdev)
223 {
224 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
225 int r;
226
227 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
228 if (IS_ERR(ddata->vcc)) {
229 dev_err(&pdev->dev, "failed to get regulator\n");
230 return PTR_ERR(ddata->vcc);
231 }
232
233 /* lcd INI */
234 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
235 if (r)
236 return r;
237
238 /* lcd RESB */
239 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
240 if (r)
241 return r;
242
243 /* lcd MO */
244 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
245 if (r)
246 return r;
247
248 /* lcd LR */
249 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
250 if (r)
251 return r;
252
253 /* lcd UD */
254 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
255 if (r)
256 return r;
257
258 return 0;
259 }
260
sharp_ls_probe(struct platform_device * pdev)261 static int sharp_ls_probe(struct platform_device *pdev)
262 {
263 struct panel_drv_data *ddata;
264 struct omap_dss_device *dssdev;
265 int r;
266
267 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
268 if (ddata == NULL)
269 return -ENOMEM;
270
271 platform_set_drvdata(pdev, ddata);
272
273 r = sharp_ls_probe_of(pdev);
274 if (r)
275 return r;
276
277 ddata->vm = sharp_ls_vm;
278
279 dssdev = &ddata->dssdev;
280 dssdev->dev = &pdev->dev;
281 dssdev->driver = &sharp_ls_ops;
282 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
283 dssdev->owner = THIS_MODULE;
284 dssdev->panel.vm = ddata->vm;
285
286 r = omapdss_register_display(dssdev);
287 if (r) {
288 dev_err(&pdev->dev, "Failed to register panel\n");
289 return r;
290 }
291
292 return 0;
293 }
294
sharp_ls_remove(struct platform_device * pdev)295 static int __exit sharp_ls_remove(struct platform_device *pdev)
296 {
297 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
298 struct omap_dss_device *dssdev = &ddata->dssdev;
299
300 omapdss_unregister_display(dssdev);
301
302 sharp_ls_disable(dssdev);
303 sharp_ls_disconnect(dssdev);
304
305 return 0;
306 }
307
308 static const struct of_device_id sharp_ls_of_match[] = {
309 { .compatible = "omapdss,sharp,ls037v7dw01", },
310 {},
311 };
312
313 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
314
315 static struct platform_driver sharp_ls_driver = {
316 .probe = sharp_ls_probe,
317 .remove = __exit_p(sharp_ls_remove),
318 .driver = {
319 .name = "panel-sharp-ls037v7dw01",
320 .of_match_table = sharp_ls_of_match,
321 .suppress_bind_attrs = true,
322 },
323 };
324
325 module_platform_driver(sharp_ls_driver);
326
327 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
328 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
329 MODULE_LICENSE("GPL");
330
