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
18struct 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
34static 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
57static 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
68static 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
79static 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
121static 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
147static 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
159static 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
167static 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
176static 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
190static  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
205static 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
253static 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
290err_reg:
291	omap_dss_put_device(ddata->in);
292	return r;
293}
294
295static 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
311static const struct of_device_id sharp_ls_of_match[] = {
312	{ .compatible = "omapdss,sharp,ls037v7dw01", },
313	{},
314};
315
316MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
317
318static 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
328module_platform_driver(sharp_ls_driver);
329
330MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
331MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
332MODULE_LICENSE("GPL");
333