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
63 if (omapdss_device_is_connected(dssdev))
64 return 0;
65
66 return in->ops.dpi->connect(in, dssdev);
67 }
68
sharp_ls_disconnect(struct omap_dss_device * dssdev)69 static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
70 {
71 struct panel_drv_data *ddata = to_panel_data(dssdev);
72 struct omap_dss_device *in = ddata->in;
73
74 if (!omapdss_device_is_connected(dssdev))
75 return;
76
77 in->ops.dpi->disconnect(in, dssdev);
78 }
79
sharp_ls_enable(struct omap_dss_device * dssdev)80 static int sharp_ls_enable(struct omap_dss_device *dssdev)
81 {
82 struct panel_drv_data *ddata = to_panel_data(dssdev);
83 struct omap_dss_device *in = ddata->in;
84 int r;
85
86 if (!omapdss_device_is_connected(dssdev))
87 return -ENODEV;
88
89 if (omapdss_device_is_enabled(dssdev))
90 return 0;
91
92 if (ddata->data_lines)
93 in->ops.dpi->set_data_lines(in, ddata->data_lines);
94 in->ops.dpi->set_timings(in, &ddata->videomode);
95
96 if (ddata->vcc) {
97 r = regulator_enable(ddata->vcc);
98 if (r != 0)
99 return r;
100 }
101
102 r = in->ops.dpi->enable(in);
103 if (r) {
104 regulator_disable(ddata->vcc);
105 return r;
106 }
107
108 /* wait couple of vsyncs until enabling the LCD */
109 msleep(50);
110
111 if (ddata->resb_gpio)
112 gpiod_set_value_cansleep(ddata->resb_gpio, 1);
113
114 if (ddata->ini_gpio)
115 gpiod_set_value_cansleep(ddata->ini_gpio, 1);
116
117 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
118
119 return 0;
120 }
121
sharp_ls_disable(struct omap_dss_device * dssdev)122 static void sharp_ls_disable(struct omap_dss_device *dssdev)
123 {
124 struct panel_drv_data *ddata = to_panel_data(dssdev);
125 struct omap_dss_device *in = ddata->in;
126
127 if (!omapdss_device_is_enabled(dssdev))
128 return;
129
130 if (ddata->ini_gpio)
131 gpiod_set_value_cansleep(ddata->ini_gpio, 0);
132
133 if (ddata->resb_gpio)
134 gpiod_set_value_cansleep(ddata->resb_gpio, 0);
135
136 /* wait at least 5 vsyncs after disabling the LCD */
137
138 msleep(100);
139
140 in->ops.dpi->disable(in);
141
142 if (ddata->vcc)
143 regulator_disable(ddata->vcc);
144
145 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
146 }
147
sharp_ls_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)148 static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
149 struct omap_video_timings *timings)
150 {
151 struct panel_drv_data *ddata = to_panel_data(dssdev);
152 struct omap_dss_device *in = ddata->in;
153
154 ddata->videomode = *timings;
155 dssdev->panel.timings = *timings;
156
157 in->ops.dpi->set_timings(in, timings);
158 }
159
sharp_ls_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)160 static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
161 struct omap_video_timings *timings)
162 {
163 struct panel_drv_data *ddata = to_panel_data(dssdev);
164
165 *timings = ddata->videomode;
166 }
167
sharp_ls_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)168 static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
169 struct omap_video_timings *timings)
170 {
171 struct panel_drv_data *ddata = to_panel_data(dssdev);
172 struct omap_dss_device *in = ddata->in;
173
174 return in->ops.dpi->check_timings(in, timings);
175 }
176
177 static struct omap_dss_driver sharp_ls_ops = {
178 .connect = sharp_ls_connect,
179 .disconnect = sharp_ls_disconnect,
180
181 .enable = sharp_ls_enable,
182 .disable = sharp_ls_disable,
183
184 .set_timings = sharp_ls_set_timings,
185 .get_timings = sharp_ls_get_timings,
186 .check_timings = sharp_ls_check_timings,
187
188 .get_resolution = omapdss_default_get_resolution,
189 };
190
sharp_ls_get_gpio_of(struct device * dev,int index,int val,const char * desc,struct gpio_desc ** gpiod)191 static int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
192 const char *desc, struct gpio_desc **gpiod)
193 {
194 struct gpio_desc *gd;
195
196 *gpiod = NULL;
197
198 gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
199 if (IS_ERR(gd))
200 return PTR_ERR(gd);
201
202 *gpiod = gd;
203 return 0;
204 }
205
sharp_ls_probe_of(struct platform_device * pdev)206 static int sharp_ls_probe_of(struct platform_device *pdev)
207 {
208 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
209 struct device_node *node = pdev->dev.of_node;
210 struct omap_dss_device *in;
211 int r;
212
213 ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
214 if (IS_ERR(ddata->vcc))
215 return dev_err_probe(&pdev->dev, PTR_ERR(ddata->vcc),
216 "failed to get regulator\n");
217
218 /* lcd INI */
219 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
220 if (r)
221 return r;
222
223 /* lcd RESB */
224 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
225 if (r)
226 return r;
227
228 /* lcd MO */
229 r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
230 if (r)
231 return r;
232
233 /* lcd LR */
234 r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
235 if (r)
236 return r;
237
238 /* lcd UD */
239 r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
240 if (r)
241 return r;
242
243 in = omapdss_of_find_source_for_first_ep(node);
244 if (IS_ERR(in)) {
245 dev_err(&pdev->dev, "failed to find video source\n");
246 return PTR_ERR(in);
247 }
248
249 ddata->in = in;
250
251 return 0;
252 }
253
sharp_ls_probe(struct platform_device * pdev)254 static int sharp_ls_probe(struct platform_device *pdev)
255 {
256 struct panel_drv_data *ddata;
257 struct omap_dss_device *dssdev;
258 int r;
259
260 if (!pdev->dev.of_node)
261 return -ENODEV;
262
263 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
264 if (ddata == NULL)
265 return -ENOMEM;
266
267 platform_set_drvdata(pdev, ddata);
268
269 r = sharp_ls_probe_of(pdev);
270 if (r)
271 return r;
272
273 ddata->videomode = sharp_ls_timings;
274
275 dssdev = &ddata->dssdev;
276 dssdev->dev = &pdev->dev;
277 dssdev->driver = &sharp_ls_ops;
278 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
279 dssdev->owner = THIS_MODULE;
280 dssdev->panel.timings = ddata->videomode;
281 dssdev->phy.dpi.data_lines = ddata->data_lines;
282
283 r = omapdss_register_display(dssdev);
284 if (r) {
285 dev_err(&pdev->dev, "Failed to register panel\n");
286 goto err_reg;
287 }
288
289 return 0;
290
291 err_reg:
292 omap_dss_put_device(ddata->in);
293 return r;
294 }
295
sharp_ls_remove(struct platform_device * pdev)296 static int __exit sharp_ls_remove(struct platform_device *pdev)
297 {
298 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
299 struct omap_dss_device *dssdev = &ddata->dssdev;
300 struct omap_dss_device *in = ddata->in;
301
302 omapdss_unregister_display(dssdev);
303
304 sharp_ls_disable(dssdev);
305 sharp_ls_disconnect(dssdev);
306
307 omap_dss_put_device(in);
308
309 return 0;
310 }
311
312 static const struct of_device_id sharp_ls_of_match[] = {
313 { .compatible = "omapdss,sharp,ls037v7dw01", },
314 {},
315 };
316
317 MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
318
319 static struct platform_driver sharp_ls_driver = {
320 .probe = sharp_ls_probe,
321 .remove = __exit_p(sharp_ls_remove),
322 .driver = {
323 .name = "panel-sharp-ls037v7dw01",
324 .of_match_table = sharp_ls_of_match,
325 .suppress_bind_attrs = true,
326 },
327 };
328
329 module_platform_driver(sharp_ls_driver);
330
331 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
332 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
333 MODULE_LICENSE("GPL");
334