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
19struct 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
35static 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
58static 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
74static 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
85static 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
127static 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
153static 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
165static 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
173static 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
182static 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
196static  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
211static 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
260static 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
297err_reg:
298	omap_dss_put_device(ddata->in);
299	return r;
300}
301
302static 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
318static const struct of_device_id sharp_ls_of_match[] = {
319	{ .compatible = "omapdss,sharp,ls037v7dw01", },
320	{},
321};
322
323MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
324
325static 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
335module_platform_driver(sharp_ls_driver);
336
337MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
338MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
339MODULE_LICENSE("GPL");
340