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