1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LG.Philips LB035Q02 LCD Panel driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 * Based on a driver by: Steve Sakoman <steve@sakoman.com>
8 */
9
10#include <linux/module.h>
11#include <linux/delay.h>
12#include <linux/spi/spi.h>
13#include <linux/mutex.h>
14#include <linux/gpio.h>
15
16#include <video/omapfb_dss.h>
17
18static const struct omap_video_timings lb035q02_timings = {
19	.x_res = 320,
20	.y_res = 240,
21
22	.pixelclock	= 6500000,
23
24	.hsw		= 2,
25	.hfp		= 20,
26	.hbp		= 68,
27
28	.vsw		= 2,
29	.vfp		= 4,
30	.vbp		= 18,
31
32	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
33	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
34	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
35	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
36	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_FALLING_EDGE,
37};
38
39struct panel_drv_data {
40	struct omap_dss_device dssdev;
41	struct omap_dss_device *in;
42
43	struct spi_device *spi;
44
45	int data_lines;
46
47	struct omap_video_timings videomode;
48
49	/* used for non-DT boot, to be removed */
50	int backlight_gpio;
51
52	struct gpio_desc *enable_gpio;
53};
54
55#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
56
57static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
58{
59	struct spi_message msg;
60	struct spi_transfer index_xfer = {
61		.len		= 3,
62		.cs_change	= 1,
63	};
64	struct spi_transfer value_xfer = {
65		.len		= 3,
66	};
67	u8	buffer[16];
68
69	spi_message_init(&msg);
70
71	/* register index */
72	buffer[0] = 0x70;
73	buffer[1] = 0x00;
74	buffer[2] = reg & 0x7f;
75	index_xfer.tx_buf = buffer;
76	spi_message_add_tail(&index_xfer, &msg);
77
78	/* register value */
79	buffer[4] = 0x72;
80	buffer[5] = val >> 8;
81	buffer[6] = val;
82	value_xfer.tx_buf = buffer + 4;
83	spi_message_add_tail(&value_xfer, &msg);
84
85	return spi_sync(spi, &msg);
86}
87
88static void init_lb035q02_panel(struct spi_device *spi)
89{
90	/* Init sequence from page 28 of the lb035q02 spec */
91	lb035q02_write_reg(spi, 0x01, 0x6300);
92	lb035q02_write_reg(spi, 0x02, 0x0200);
93	lb035q02_write_reg(spi, 0x03, 0x0177);
94	lb035q02_write_reg(spi, 0x04, 0x04c7);
95	lb035q02_write_reg(spi, 0x05, 0xffc0);
96	lb035q02_write_reg(spi, 0x06, 0xe806);
97	lb035q02_write_reg(spi, 0x0a, 0x4008);
98	lb035q02_write_reg(spi, 0x0b, 0x0000);
99	lb035q02_write_reg(spi, 0x0d, 0x0030);
100	lb035q02_write_reg(spi, 0x0e, 0x2800);
101	lb035q02_write_reg(spi, 0x0f, 0x0000);
102	lb035q02_write_reg(spi, 0x16, 0x9f80);
103	lb035q02_write_reg(spi, 0x17, 0x0a0f);
104	lb035q02_write_reg(spi, 0x1e, 0x00c1);
105	lb035q02_write_reg(spi, 0x30, 0x0300);
106	lb035q02_write_reg(spi, 0x31, 0x0007);
107	lb035q02_write_reg(spi, 0x32, 0x0000);
108	lb035q02_write_reg(spi, 0x33, 0x0000);
109	lb035q02_write_reg(spi, 0x34, 0x0707);
110	lb035q02_write_reg(spi, 0x35, 0x0004);
111	lb035q02_write_reg(spi, 0x36, 0x0302);
112	lb035q02_write_reg(spi, 0x37, 0x0202);
113	lb035q02_write_reg(spi, 0x3a, 0x0a0d);
114	lb035q02_write_reg(spi, 0x3b, 0x0806);
115}
116
117static int lb035q02_connect(struct omap_dss_device *dssdev)
118{
119	struct panel_drv_data *ddata = to_panel_data(dssdev);
120	struct omap_dss_device *in = ddata->in;
121	int r;
122
123	if (omapdss_device_is_connected(dssdev))
124		return 0;
125
126	r = in->ops.dpi->connect(in, dssdev);
127	if (r)
128		return r;
129
130	init_lb035q02_panel(ddata->spi);
131
132	return 0;
133}
134
135static void lb035q02_disconnect(struct omap_dss_device *dssdev)
136{
137	struct panel_drv_data *ddata = to_panel_data(dssdev);
138	struct omap_dss_device *in = ddata->in;
139
140	if (!omapdss_device_is_connected(dssdev))
141		return;
142
143	in->ops.dpi->disconnect(in, dssdev);
144}
145
146static int lb035q02_enable(struct omap_dss_device *dssdev)
147{
148	struct panel_drv_data *ddata = to_panel_data(dssdev);
149	struct omap_dss_device *in = ddata->in;
150	int r;
151
152	if (!omapdss_device_is_connected(dssdev))
153		return -ENODEV;
154
155	if (omapdss_device_is_enabled(dssdev))
156		return 0;
157
158	if (ddata->data_lines)
159		in->ops.dpi->set_data_lines(in, ddata->data_lines);
160	in->ops.dpi->set_timings(in, &ddata->videomode);
161
162	r = in->ops.dpi->enable(in);
163	if (r)
164		return r;
165
166	if (ddata->enable_gpio)
167		gpiod_set_value_cansleep(ddata->enable_gpio, 1);
168
169	if (gpio_is_valid(ddata->backlight_gpio))
170		gpio_set_value_cansleep(ddata->backlight_gpio, 1);
171
172	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
173
174	return 0;
175}
176
177static void lb035q02_disable(struct omap_dss_device *dssdev)
178{
179	struct panel_drv_data *ddata = to_panel_data(dssdev);
180	struct omap_dss_device *in = ddata->in;
181
182	if (!omapdss_device_is_enabled(dssdev))
183		return;
184
185	if (ddata->enable_gpio)
186		gpiod_set_value_cansleep(ddata->enable_gpio, 0);
187
188	if (gpio_is_valid(ddata->backlight_gpio))
189		gpio_set_value_cansleep(ddata->backlight_gpio, 0);
190
191	in->ops.dpi->disable(in);
192
193	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
194}
195
196static void lb035q02_set_timings(struct omap_dss_device *dssdev,
197		struct omap_video_timings *timings)
198{
199	struct panel_drv_data *ddata = to_panel_data(dssdev);
200	struct omap_dss_device *in = ddata->in;
201
202	ddata->videomode = *timings;
203	dssdev->panel.timings = *timings;
204
205	in->ops.dpi->set_timings(in, timings);
206}
207
208static void lb035q02_get_timings(struct omap_dss_device *dssdev,
209		struct omap_video_timings *timings)
210{
211	struct panel_drv_data *ddata = to_panel_data(dssdev);
212
213	*timings = ddata->videomode;
214}
215
216static int lb035q02_check_timings(struct omap_dss_device *dssdev,
217		struct omap_video_timings *timings)
218{
219	struct panel_drv_data *ddata = to_panel_data(dssdev);
220	struct omap_dss_device *in = ddata->in;
221
222	return in->ops.dpi->check_timings(in, timings);
223}
224
225static struct omap_dss_driver lb035q02_ops = {
226	.connect	= lb035q02_connect,
227	.disconnect	= lb035q02_disconnect,
228
229	.enable		= lb035q02_enable,
230	.disable	= lb035q02_disable,
231
232	.set_timings	= lb035q02_set_timings,
233	.get_timings	= lb035q02_get_timings,
234	.check_timings	= lb035q02_check_timings,
235
236	.get_resolution	= omapdss_default_get_resolution,
237};
238
239static int lb035q02_probe_of(struct spi_device *spi)
240{
241	struct device_node *node = spi->dev.of_node;
242	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
243	struct omap_dss_device *in;
244	struct gpio_desc *gpio;
245
246	gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
247	if (IS_ERR(gpio)) {
248		dev_err(&spi->dev, "failed to parse enable gpio\n");
249		return PTR_ERR(gpio);
250	}
251
252	ddata->enable_gpio = gpio;
253
254	ddata->backlight_gpio = -ENOENT;
255
256	in = omapdss_of_find_source_for_first_ep(node);
257	if (IS_ERR(in)) {
258		dev_err(&spi->dev, "failed to find video source\n");
259		return PTR_ERR(in);
260	}
261
262	ddata->in = in;
263
264	return 0;
265}
266
267static int lb035q02_panel_spi_probe(struct spi_device *spi)
268{
269	struct panel_drv_data *ddata;
270	struct omap_dss_device *dssdev;
271	int r;
272
273	if (!spi->dev.of_node)
274		return -ENODEV;
275
276	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
277	if (ddata == NULL)
278		return -ENOMEM;
279
280	dev_set_drvdata(&spi->dev, ddata);
281
282	ddata->spi = spi;
283
284	r = lb035q02_probe_of(spi);
285	if (r)
286		return r;
287
288	if (gpio_is_valid(ddata->backlight_gpio)) {
289		r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
290				GPIOF_OUT_INIT_LOW, "panel backlight");
291		if (r)
292			goto err_gpio;
293	}
294
295	ddata->videomode = lb035q02_timings;
296
297	dssdev = &ddata->dssdev;
298	dssdev->dev = &spi->dev;
299	dssdev->driver = &lb035q02_ops;
300	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
301	dssdev->owner = THIS_MODULE;
302	dssdev->panel.timings = ddata->videomode;
303	dssdev->phy.dpi.data_lines = ddata->data_lines;
304
305	r = omapdss_register_display(dssdev);
306	if (r) {
307		dev_err(&spi->dev, "Failed to register panel\n");
308		goto err_reg;
309	}
310
311	return 0;
312
313err_reg:
314err_gpio:
315	omap_dss_put_device(ddata->in);
316	return r;
317}
318
319static int lb035q02_panel_spi_remove(struct spi_device *spi)
320{
321	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
322	struct omap_dss_device *dssdev = &ddata->dssdev;
323	struct omap_dss_device *in = ddata->in;
324
325	omapdss_unregister_display(dssdev);
326
327	lb035q02_disable(dssdev);
328	lb035q02_disconnect(dssdev);
329
330	omap_dss_put_device(in);
331
332	return 0;
333}
334
335static const struct of_device_id lb035q02_of_match[] = {
336	{ .compatible = "omapdss,lgphilips,lb035q02", },
337	{},
338};
339
340MODULE_DEVICE_TABLE(of, lb035q02_of_match);
341
342static struct spi_driver lb035q02_spi_driver = {
343	.probe		= lb035q02_panel_spi_probe,
344	.remove		= lb035q02_panel_spi_remove,
345	.driver		= {
346		.name	= "panel_lgphilips_lb035q02",
347		.of_match_table = lb035q02_of_match,
348		.suppress_bind_attrs = true,
349	},
350};
351
352module_spi_driver(lb035q02_spi_driver);
353
354MODULE_ALIAS("spi:lgphilips,lb035q02");
355MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
356MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
357MODULE_LICENSE("GPL");
358