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