1 /*
2 * LCD panel driver for Sharp LS037V7DW01
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/delay.h>
13 #include <linux/gpio.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/of_gpio.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
19 #include <linux/regulator/consumer.h>
20 #include <video/omapdss.h>
21 #include <video/omap-panel-data.h>
22
23 struct panel_drv_data {
24 struct omap_dss_device dssdev;
25 struct omap_dss_device *in;
26 struct regulator *vcc;
27
28 int data_lines;
29
30 struct omap_video_timings videomode;
31
32 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
33 struct gpio_desc *ini_gpio; /* high = power on */
34 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
35 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
36 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
37 };
38
39 static const struct omap_video_timings sharp_ls_timings = {
40 .x_res = 480,
41 .y_res = 640,
42
43 .pixelclock = 19200000,
44
45 .hsw = 2,
46 .hfp = 1,
47 .hbp = 28,
48
49 .vsw = 1,
50 .vfp = 1,
51 .vbp = 1,
52
53 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
54 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
55 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
56 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
57 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
58 };
59
60 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
61
sharp_ls_connect(struct omap_dss_device * dssdev)62 static int sharp_ls_connect(struct omap_dss_device *dssdev)
63 {
64 struct panel_drv_data *ddata = to_panel_data(dssdev);
65 struct omap_dss_device *in = ddata->in;
66 int r;
67
68 if (omapdss_device_is_connected(dssdev))
69 return 0;
70
71 r = in->ops.dpi->connect(in, dssdev);
72 if (r)
73 return r;
74
75 return 0;
76 }
77
sharp_ls_disconnect(struct omap_dss_device * dssdev)78 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
79 {
80 struct panel_drv_data *ddata = to_panel_data(dssdev);
81 struct omap_dss_device *in = ddata->in;
82
83 if (!omapdss_device_is_connected(dssdev))
84 return;
85
86 in->ops.dpi->disconnect(in, dssdev);
87 }
88
sharp_ls_enable(struct omap_dss_device * dssdev)89 static int sharp_ls_enable(struct omap_dss_device *dssdev)
90 {
91 struct panel_drv_data *ddata = to_panel_data(dssdev);
92 struct omap_dss_device *in = ddata->in;
93 int r;
94
95 if (!omapdss_device_is_connected(dssdev))
96 return -ENODEV;
97
98 if (omapdss_device_is_enabled(dssdev))
99 return 0;
100
101 if (ddata->data_lines)
102 in->ops.dpi->set_data_lines(in, ddata->data_lines);
103 in->ops.dpi->set_timings(in, &ddata->videomode);
104
105 if (ddata->vcc) {
106 r = regulator_enable(ddata->vcc);
107 if (r != 0)
108 return r;
109 }
110
111 r = in->ops.dpi->enable(in);
112 if (r) {
113 regulator_disable(ddata->vcc);
114 return r;
115 }
116
117 /* wait couple of vsyncs until enabling the LCD */
118 msleep(50);
119
120 if (ddata->resb_gpio)
121 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
122
123 if (ddata->ini_gpio)
124 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
125
126 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
127
128 return 0;
129 }
130
sharp_ls_disable(struct omap_dss_device * dssdev)131 static void sharp_ls_disable(struct omap_dss_device *dssdev)
132 {
133 struct panel_drv_data *ddata = to_panel_data(dssdev);
134 struct omap_dss_device *in = ddata->in;
135
136 if (!omapdss_device_is_enabled(dssdev))
137 return;
138
139 if (ddata->ini_gpio)
140 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
141
142 if (ddata->resb_gpio)
143 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
144
145 /* wait at least 5 vsyncs after disabling the LCD */
146
147 msleep(100);
148
149 in->ops.dpi->disable(in);
150
151 if (ddata->vcc)
152 regulator_disable(ddata->vcc);
153
154 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
155 }
156
sharp_ls_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)157 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
158 struct omap_video_timings *timings)
159 {
160 struct panel_drv_data *ddata = to_panel_data(dssdev);
161 struct omap_dss_device *in = ddata->in;
162
163 ddata->videomode = *timings;
164 dssdev->panel.timings = *timings;
165
166 in->ops.dpi->set_timings(in, timings);
167 }
168
sharp_ls_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)169 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
170 struct omap_video_timings *timings)
171 {
172 struct panel_drv_data *ddata = to_panel_data(dssdev);
173
174 *timings = ddata->videomode;
175 }
176
sharp_ls_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)177 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
178 struct omap_video_timings *timings)
179 {
180 struct panel_drv_data *ddata = to_panel_data(dssdev);
181 struct omap_dss_device *in = ddata->in;
182
183 return in->ops.dpi->check_timings(in, timings);
184 }
185
186 static struct omap_dss_driver sharp_ls_ops = {
187 .connect = sharp_ls_connect,
188 .disconnect = sharp_ls_disconnect,
189
190 .enable = sharp_ls_enable,
191 .disable = sharp_ls_disable,
192
193 .set_timings = sharp_ls_set_timings,
194 .get_timings = sharp_ls_get_timings,
195 .check_timings = sharp_ls_check_timings,
196
197 .get_resolution = omapdss_default_get_resolution,
198 };
199
sharp_ls_get_gpio(struct device * dev,int gpio,unsigned long flags,char * desc,struct gpio_desc ** gpiod)200 static int sharp_ls_get_gpio(struct device *dev, int gpio, unsigned long flags,
201 char *desc, struct gpio_desc **gpiod)
202 {
203 struct gpio_desc *gd;
204 int r;
205
206 *gpiod = NULL;
207
208 r = devm_gpio_request_one(dev, gpio, flags, desc);
209 if (r)
210 return r == -ENOENT ? 0 : r;
211
212 gd = gpio_to_desc(gpio);
213 if (IS_ERR(gd))
214 return PTR_ERR(gd) == -ENOENT ? 0 : PTR_ERR(gd);
215
216 *gpiod = gd;
217 return 0;
218 }
219
sharp_ls_probe_pdata(struct platform_device * pdev)220 static int sharp_ls_probe_pdata(struct platform_device *pdev)
221 {
222 const struct panel_sharp_ls037v7dw01_platform_data *pdata;
223 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
224 struct omap_dss_device *dssdev, *in;
225 int r;
226
227 pdata = dev_get_platdata(&pdev->dev);
228
229 in = omap_dss_find_output(pdata->source);
230 if (in == NULL) {
231 dev_err(&pdev->dev, "failed to find video source '%s'\n",
232 pdata->source);
233 return -EPROBE_DEFER;
234 }
235
236 ddata->in = in;
237
238 ddata->data_lines = pdata->data_lines;
239
240 dssdev = &ddata->dssdev;
241 dssdev->name = pdata->name;
242
243 r = sharp_ls_get_gpio(&pdev->dev, pdata->mo_gpio, GPIOF_OUT_INIT_LOW,
244 "lcd MO", &ddata->mo_gpio);
245 if (r)
246 return r;
247 r = sharp_ls_get_gpio(&pdev->dev, pdata->lr_gpio, GPIOF_OUT_INIT_HIGH,
248 "lcd LR", &ddata->lr_gpio);
249 if (r)
250 return r;
251 r = sharp_ls_get_gpio(&pdev->dev, pdata->ud_gpio, GPIOF_OUT_INIT_HIGH,
252 "lcd UD", &ddata->ud_gpio);
253 if (r)
254 return r;
255 r = sharp_ls_get_gpio(&pdev->dev, pdata->resb_gpio, GPIOF_OUT_INIT_LOW,
256 "lcd RESB", &ddata->resb_gpio);
257 if (r)
258 return r;
259 r = sharp_ls_get_gpio(&pdev->dev, pdata->ini_gpio, GPIOF_OUT_INIT_LOW,
260 "lcd INI", &ddata->ini_gpio);
261 if (r)
262 return r;
263
264 return 0;
265 }
266
sharp_ls_get_gpio_of(struct device * dev,int index,int val,const char * desc,struct gpio_desc ** gpiod)267 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
268 const char *desc, struct gpio_desc **gpiod)
269 {
270 struct gpio_desc *gd;
271 int r;
272
273 *gpiod = NULL;
274
275 gd = devm_gpiod_get_index(dev, desc, index);
276 if (IS_ERR(gd))
277 return PTR_ERR(gd) == -ENOENT ? 0 : PTR_ERR(gd);
278
279 r = gpiod_direction_output(gd, val);
280 if (r)
281 return r;
282
283 *gpiod = gd;
284 return 0;
285 }
286
sharp_ls_probe_of(struct platform_device * pdev)287 static int sharp_ls_probe_of(struct platform_device *pdev)
288 {
289 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
290 struct device_node *node = pdev->dev.of_node;
291 struct omap_dss_device *in;
292 int r;
293
294 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
295 if (IS_ERR(ddata->vcc)) {
296 dev_err(&pdev->dev, "failed to get regulator\n");
297 return PTR_ERR(ddata->vcc);
298 }
299
300 /* lcd INI */
301 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
302 if (r)
303 return r;
304
305 /* lcd RESB */
306 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
307 if (r)
308 return r;
309
310 /* lcd MO */
311 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
312 if (r)
313 return r;
314
315 /* lcd LR */
316 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
317 if (r)
318 return r;
319
320 /* lcd UD */
321 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
322 if (r)
323 return r;
324
325 in = omapdss_of_find_source_for_first_ep(node);
326 if (IS_ERR(in)) {
327 dev_err(&pdev->dev, "failed to find video source\n");
328 return PTR_ERR(in);
329 }
330
331 ddata->in = in;
332
333 return 0;
334 }
335
sharp_ls_probe(struct platform_device * pdev)336 static int sharp_ls_probe(struct platform_device *pdev)
337 {
338 struct panel_drv_data *ddata;
339 struct omap_dss_device *dssdev;
340 int r;
341
342 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
343 if (ddata == NULL)
344 return -ENOMEM;
345
346 platform_set_drvdata(pdev, ddata);
347
348 if (dev_get_platdata(&pdev->dev)) {
349 r = sharp_ls_probe_pdata(pdev);
350 if (r)
351 return r;
352 } else if (pdev->dev.of_node) {
353 r = sharp_ls_probe_of(pdev);
354 if (r)
355 return r;
356 } else {
357 return -ENODEV;
358 }
359
360 ddata->videomode = sharp_ls_timings;
361
362 dssdev = &ddata->dssdev;
363 dssdev->dev = &pdev->dev;
364 dssdev->driver = &sharp_ls_ops;
365 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
366 dssdev->owner = THIS_MODULE;
367 dssdev->panel.timings = ddata->videomode;
368 dssdev->phy.dpi.data_lines = ddata->data_lines;
369
370 r = omapdss_register_display(dssdev);
371 if (r) {
372 dev_err(&pdev->dev, "Failed to register panel\n");
373 goto err_reg;
374 }
375
376 return 0;
377
378 err_reg:
379 omap_dss_put_device(ddata->in);
380 return r;
381 }
382
sharp_ls_remove(struct platform_device * pdev)383 static int __exit sharp_ls_remove(struct platform_device *pdev)
384 {
385 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
386 struct omap_dss_device *dssdev = &ddata->dssdev;
387 struct omap_dss_device *in = ddata->in;
388
389 omapdss_unregister_display(dssdev);
390
391 sharp_ls_disable(dssdev);
392 sharp_ls_disconnect(dssdev);
393
394 omap_dss_put_device(in);
395
396 return 0;
397 }
398
399 static const struct of_device_id sharp_ls_of_match[] = {
400 { .compatible = "omapdss,sharp,ls037v7dw01", },
401 {},
402 };
403
404 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
405
406 static struct platform_driver sharp_ls_driver = {
407 .probe = sharp_ls_probe,
408 .remove = __exit_p(sharp_ls_remove),
409 .driver = {
410 .name = "panel-sharp-ls037v7dw01",
411 .owner = THIS_MODULE,
412 .of_match_table = sharp_ls_of_match,
413 .suppress_bind_attrs = true,
414 },
415 };
416
417 module_platform_driver(sharp_ls_driver);
418
419 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
420 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
421 MODULE_LICENSE("GPL");
422