1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * LCD panel driver for Sharp LS037V7DW01
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9 #include <linux/delay.h>
10 #include <linux/gpio.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/of_gpio.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/regulator/consumer.h>
17 #include <video/omapfb_dss.h>
18
19 struct panel_drv_data {
20 struct omap_dss_device dssdev;
21 struct omap_dss_device *in;
22 struct regulator *vcc;
23
24 int data_lines;
25
26 struct omap_video_timings videomode;
27
28 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
29 struct gpio_desc *ini_gpio; /* high = power on */
30 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
31 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
32 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
33 };
34
35 static const struct omap_video_timings sharp_ls_timings = {
36 .x_res = 480,
37 .y_res = 640,
38
39 .pixelclock = 19200000,
40
41 .hsw = 2,
42 .hfp = 1,
43 .hbp = 28,
44
45 .vsw = 1,
46 .vfp = 1,
47 .vbp = 1,
48
49 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
50 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
51 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
52 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
53 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
54 };
55
56 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
57
sharp_ls_connect(struct omap_dss_device * dssdev)58 static int sharp_ls_connect(struct omap_dss_device *dssdev)
59 {
60 struct panel_drv_data *ddata = to_panel_data(dssdev);
61 struct omap_dss_device *in = ddata->in;
62 int r;
63
64 if (omapdss_device_is_connected(dssdev))
65 return 0;
66
67 r = in->ops.dpi->connect(in, dssdev);
68 if (r)
69 return r;
70
71 return 0;
72 }
73
sharp_ls_disconnect(struct omap_dss_device * dssdev)74 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
75 {
76 struct panel_drv_data *ddata = to_panel_data(dssdev);
77 struct omap_dss_device *in = ddata->in;
78
79 if (!omapdss_device_is_connected(dssdev))
80 return;
81
82 in->ops.dpi->disconnect(in, dssdev);
83 }
84
sharp_ls_enable(struct omap_dss_device * dssdev)85 static int sharp_ls_enable(struct omap_dss_device *dssdev)
86 {
87 struct panel_drv_data *ddata = to_panel_data(dssdev);
88 struct omap_dss_device *in = ddata->in;
89 int r;
90
91 if (!omapdss_device_is_connected(dssdev))
92 return -ENODEV;
93
94 if (omapdss_device_is_enabled(dssdev))
95 return 0;
96
97 if (ddata->data_lines)
98 in->ops.dpi->set_data_lines(in, ddata->data_lines);
99 in->ops.dpi->set_timings(in, &ddata->videomode);
100
101 if (ddata->vcc) {
102 r = regulator_enable(ddata->vcc);
103 if (r != 0)
104 return r;
105 }
106
107 r = in->ops.dpi->enable(in);
108 if (r) {
109 regulator_disable(ddata->vcc);
110 return r;
111 }
112
113 /* wait couple of vsyncs until enabling the LCD */
114 msleep(50);
115
116 if (ddata->resb_gpio)
117 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
118
119 if (ddata->ini_gpio)
120 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
121
122 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
123
124 return 0;
125 }
126
sharp_ls_disable(struct omap_dss_device * dssdev)127 static void sharp_ls_disable(struct omap_dss_device *dssdev)
128 {
129 struct panel_drv_data *ddata = to_panel_data(dssdev);
130 struct omap_dss_device *in = ddata->in;
131
132 if (!omapdss_device_is_enabled(dssdev))
133 return;
134
135 if (ddata->ini_gpio)
136 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
137
138 if (ddata->resb_gpio)
139 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
140
141 /* wait at least 5 vsyncs after disabling the LCD */
142
143 msleep(100);
144
145 in->ops.dpi->disable(in);
146
147 if (ddata->vcc)
148 regulator_disable(ddata->vcc);
149
150 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
151 }
152
sharp_ls_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)153 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
154 struct omap_video_timings *timings)
155 {
156 struct panel_drv_data *ddata = to_panel_data(dssdev);
157 struct omap_dss_device *in = ddata->in;
158
159 ddata->videomode = *timings;
160 dssdev->panel.timings = *timings;
161
162 in->ops.dpi->set_timings(in, timings);
163 }
164
sharp_ls_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)165 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
166 struct omap_video_timings *timings)
167 {
168 struct panel_drv_data *ddata = to_panel_data(dssdev);
169
170 *timings = ddata->videomode;
171 }
172
sharp_ls_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)173 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
174 struct omap_video_timings *timings)
175 {
176 struct panel_drv_data *ddata = to_panel_data(dssdev);
177 struct omap_dss_device *in = ddata->in;
178
179 return in->ops.dpi->check_timings(in, timings);
180 }
181
182 static struct omap_dss_driver sharp_ls_ops = {
183 .connect = sharp_ls_connect,
184 .disconnect = sharp_ls_disconnect,
185
186 .enable = sharp_ls_enable,
187 .disable = sharp_ls_disable,
188
189 .set_timings = sharp_ls_set_timings,
190 .get_timings = sharp_ls_get_timings,
191 .check_timings = sharp_ls_check_timings,
192
193 .get_resolution = omapdss_default_get_resolution,
194 };
195
sharp_ls_get_gpio_of(struct device * dev,int index,int val,const char * desc,struct gpio_desc ** gpiod)196 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
197 const char *desc, struct gpio_desc **gpiod)
198 {
199 struct gpio_desc *gd;
200
201 *gpiod = NULL;
202
203 gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
204 if (IS_ERR(gd))
205 return PTR_ERR(gd);
206
207 *gpiod = gd;
208 return 0;
209 }
210
sharp_ls_probe_of(struct platform_device * pdev)211 static int sharp_ls_probe_of(struct platform_device *pdev)
212 {
213 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
214 struct device_node *node = pdev->dev.of_node;
215 struct omap_dss_device *in;
216 int r;
217
218 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
219 if (IS_ERR(ddata->vcc)) {
220 dev_err(&pdev->dev, "failed to get regulator\n");
221 return PTR_ERR(ddata->vcc);
222 }
223
224 /* lcd INI */
225 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
226 if (r)
227 return r;
228
229 /* lcd RESB */
230 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
231 if (r)
232 return r;
233
234 /* lcd MO */
235 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
236 if (r)
237 return r;
238
239 /* lcd LR */
240 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
241 if (r)
242 return r;
243
244 /* lcd UD */
245 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
246 if (r)
247 return r;
248
249 in = omapdss_of_find_source_for_first_ep(node);
250 if (IS_ERR(in)) {
251 dev_err(&pdev->dev, "failed to find video source\n");
252 return PTR_ERR(in);
253 }
254
255 ddata->in = in;
256
257 return 0;
258 }
259
sharp_ls_probe(struct platform_device * pdev)260 static int sharp_ls_probe(struct platform_device *pdev)
261 {
262 struct panel_drv_data *ddata;
263 struct omap_dss_device *dssdev;
264 int r;
265
266 if (!pdev->dev.of_node)
267 return -ENODEV;
268
269 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
270 if (ddata == NULL)
271 return -ENOMEM;
272
273 platform_set_drvdata(pdev, ddata);
274
275 r = sharp_ls_probe_of(pdev);
276 if (r)
277 return r;
278
279 ddata->videomode = sharp_ls_timings;
280
281 dssdev = &ddata->dssdev;
282 dssdev->dev = &pdev->dev;
283 dssdev->driver = &sharp_ls_ops;
284 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
285 dssdev->owner = THIS_MODULE;
286 dssdev->panel.timings = ddata->videomode;
287 dssdev->phy.dpi.data_lines = ddata->data_lines;
288
289 r = omapdss_register_display(dssdev);
290 if (r) {
291 dev_err(&pdev->dev, "Failed to register panel\n");
292 goto err_reg;
293 }
294
295 return 0;
296
297 err_reg:
298 omap_dss_put_device(ddata->in);
299 return r;
300 }
301
sharp_ls_remove(struct platform_device * pdev)302 static int __exit sharp_ls_remove(struct platform_device *pdev)
303 {
304 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
305 struct omap_dss_device *dssdev = &ddata->dssdev;
306 struct omap_dss_device *in = ddata->in;
307
308 omapdss_unregister_display(dssdev);
309
310 sharp_ls_disable(dssdev);
311 sharp_ls_disconnect(dssdev);
312
313 omap_dss_put_device(in);
314
315 return 0;
316 }
317
318 static const struct of_device_id sharp_ls_of_match[] = {
319 { .compatible = "omapdss,sharp,ls037v7dw01", },
320 {},
321 };
322
323 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
324
325 static struct platform_driver sharp_ls_driver = {
326 .probe = sharp_ls_probe,
327 .remove = __exit_p(sharp_ls_remove),
328 .driver = {
329 .name = "panel-sharp-ls037v7dw01",
330 .of_match_table = sharp_ls_of_match,
331 .suppress_bind_attrs = true,
332 },
333 };
334
335 module_platform_driver(sharp_ls_driver);
336
337 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
338 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
339 MODULE_LICENSE("GPL");
340