1/*
  2 * LG.Philips LB035Q02 LCD Panel driver
  3 *
  4 * Copyright (C) 2013 Texas Instruments
  5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  6 * Based on a driver by: Steve Sakoman <steve@sakoman.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify it
  9 * under the terms of the GNU General Public License version 2 as published by
 10 * the Free Software Foundation.
 11 */
 12
 13#include <linux/module.h>
 14#include <linux/delay.h>
 15#include <linux/spi/spi.h>
 16#include <linux/mutex.h>
 17#include <linux/gpio.h>
 18
 19#include <video/omapdss.h>
 20#include <video/omap-panel-data.h>
 21
 22static struct omap_video_timings lb035q02_timings = {
 23	.x_res = 320,
 24	.y_res = 240,
 25
 26	.pixelclock	= 6500000,
 27
 28	.hsw		= 2,
 29	.hfp		= 20,
 30	.hbp		= 68,
 31
 32	.vsw		= 2,
 33	.vfp		= 4,
 34	.vbp		= 18,
 35
 36	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 37	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 38	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
 39	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
 40	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_FALLING_EDGE,
 41};
 42
 43struct panel_drv_data {
 44	struct omap_dss_device dssdev;
 45	struct omap_dss_device *in;
 46
 47	struct spi_device *spi;
 48
 49	int data_lines;
 50
 51	struct omap_video_timings videomode;
 52
 53	/* used for non-DT boot, to be removed */
 54	int backlight_gpio;
 55
 56	struct gpio_desc *enable_gpio;
 57};
 58
 59#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
 60
 61static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
 62{
 63	struct spi_message msg;
 64	struct spi_transfer index_xfer = {
 65		.len		= 3,
 66		.cs_change	= 1,
 67	};
 68	struct spi_transfer value_xfer = {
 69		.len		= 3,
 70	};
 71	u8	buffer[16];
 72
 73	spi_message_init(&msg);
 74
 75	/* register index */
 76	buffer[0] = 0x70;
 77	buffer[1] = 0x00;
 78	buffer[2] = reg & 0x7f;
 79	index_xfer.tx_buf = buffer;
 80	spi_message_add_tail(&index_xfer, &msg);
 81
 82	/* register value */
 83	buffer[4] = 0x72;
 84	buffer[5] = val >> 8;
 85	buffer[6] = val;
 86	value_xfer.tx_buf = buffer + 4;
 87	spi_message_add_tail(&value_xfer, &msg);
 88
 89	return spi_sync(spi, &msg);
 90}
 91
 92static void init_lb035q02_panel(struct spi_device *spi)
 93{
 94	/* Init sequence from page 28 of the lb035q02 spec */
 95	lb035q02_write_reg(spi, 0x01, 0x6300);
 96	lb035q02_write_reg(spi, 0x02, 0x0200);
 97	lb035q02_write_reg(spi, 0x03, 0x0177);
 98	lb035q02_write_reg(spi, 0x04, 0x04c7);
 99	lb035q02_write_reg(spi, 0x05, 0xffc0);
100	lb035q02_write_reg(spi, 0x06, 0xe806);
101	lb035q02_write_reg(spi, 0x0a, 0x4008);
102	lb035q02_write_reg(spi, 0x0b, 0x0000);
103	lb035q02_write_reg(spi, 0x0d, 0x0030);
104	lb035q02_write_reg(spi, 0x0e, 0x2800);
105	lb035q02_write_reg(spi, 0x0f, 0x0000);
106	lb035q02_write_reg(spi, 0x16, 0x9f80);
107	lb035q02_write_reg(spi, 0x17, 0x0a0f);
108	lb035q02_write_reg(spi, 0x1e, 0x00c1);
109	lb035q02_write_reg(spi, 0x30, 0x0300);
110	lb035q02_write_reg(spi, 0x31, 0x0007);
111	lb035q02_write_reg(spi, 0x32, 0x0000);
112	lb035q02_write_reg(spi, 0x33, 0x0000);
113	lb035q02_write_reg(spi, 0x34, 0x0707);
114	lb035q02_write_reg(spi, 0x35, 0x0004);
115	lb035q02_write_reg(spi, 0x36, 0x0302);
116	lb035q02_write_reg(spi, 0x37, 0x0202);
117	lb035q02_write_reg(spi, 0x3a, 0x0a0d);
118	lb035q02_write_reg(spi, 0x3b, 0x0806);
119}
120
121static int lb035q02_connect(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	int r;
126
127	if (omapdss_device_is_connected(dssdev))
128		return 0;
129
130	r = in->ops.dpi->connect(in, dssdev);
131	if (r)
132		return r;
133
134	init_lb035q02_panel(ddata->spi);
135
136	return 0;
137}
138
139static void lb035q02_disconnect(struct omap_dss_device *dssdev)
140{
141	struct panel_drv_data *ddata = to_panel_data(dssdev);
142	struct omap_dss_device *in = ddata->in;
143
144	if (!omapdss_device_is_connected(dssdev))
145		return;
146
147	in->ops.dpi->disconnect(in, dssdev);
148}
149
150static int lb035q02_enable(struct omap_dss_device *dssdev)
151{
152	struct panel_drv_data *ddata = to_panel_data(dssdev);
153	struct omap_dss_device *in = ddata->in;
154	int r;
155
156	if (!omapdss_device_is_connected(dssdev))
157		return -ENODEV;
158
159	if (omapdss_device_is_enabled(dssdev))
160		return 0;
161
162	if (ddata->data_lines)
163		in->ops.dpi->set_data_lines(in, ddata->data_lines);
164	in->ops.dpi->set_timings(in, &ddata->videomode);
165
166	r = in->ops.dpi->enable(in);
167	if (r)
168		return r;
169
170	if (ddata->enable_gpio)
171		gpiod_set_value_cansleep(ddata->enable_gpio, 1);
172
173	if (gpio_is_valid(ddata->backlight_gpio))
174		gpio_set_value_cansleep(ddata->backlight_gpio, 1);
175
176	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
177
178	return 0;
179}
180
181static void lb035q02_disable(struct omap_dss_device *dssdev)
182{
183	struct panel_drv_data *ddata = to_panel_data(dssdev);
184	struct omap_dss_device *in = ddata->in;
185
186	if (!omapdss_device_is_enabled(dssdev))
187		return;
188
189	if (ddata->enable_gpio)
190		gpiod_set_value_cansleep(ddata->enable_gpio, 0);
191
192	if (gpio_is_valid(ddata->backlight_gpio))
193		gpio_set_value_cansleep(ddata->backlight_gpio, 0);
194
195	in->ops.dpi->disable(in);
196
197	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
198}
199
200static void lb035q02_set_timings(struct omap_dss_device *dssdev,
201		struct omap_video_timings *timings)
202{
203	struct panel_drv_data *ddata = to_panel_data(dssdev);
204	struct omap_dss_device *in = ddata->in;
205
206	ddata->videomode = *timings;
207	dssdev->panel.timings = *timings;
208
209	in->ops.dpi->set_timings(in, timings);
210}
211
212static void lb035q02_get_timings(struct omap_dss_device *dssdev,
213		struct omap_video_timings *timings)
214{
215	struct panel_drv_data *ddata = to_panel_data(dssdev);
216
217	*timings = ddata->videomode;
218}
219
220static int lb035q02_check_timings(struct omap_dss_device *dssdev,
221		struct omap_video_timings *timings)
222{
223	struct panel_drv_data *ddata = to_panel_data(dssdev);
224	struct omap_dss_device *in = ddata->in;
225
226	return in->ops.dpi->check_timings(in, timings);
227}
228
229static struct omap_dss_driver lb035q02_ops = {
230	.connect	= lb035q02_connect,
231	.disconnect	= lb035q02_disconnect,
232
233	.enable		= lb035q02_enable,
234	.disable	= lb035q02_disable,
235
236	.set_timings	= lb035q02_set_timings,
237	.get_timings	= lb035q02_get_timings,
238	.check_timings	= lb035q02_check_timings,
239
240	.get_resolution	= omapdss_default_get_resolution,
241};
242
243static int lb035q02_probe_of(struct spi_device *spi)
244{
245	struct device_node *node = spi->dev.of_node;
246	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
247	struct omap_dss_device *in;
248	struct gpio_desc *gpio;
249
250	gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
251	if (IS_ERR(gpio)) {
252		dev_err(&spi->dev, "failed to parse enable gpio\n");
253		return PTR_ERR(gpio);
254	}
255
256	ddata->enable_gpio = gpio;
257
258	ddata->backlight_gpio = -ENOENT;
259
260	in = omapdss_of_find_source_for_first_ep(node);
261	if (IS_ERR(in)) {
262		dev_err(&spi->dev, "failed to find video source\n");
263		return PTR_ERR(in);
264	}
265
266	ddata->in = in;
267
268	return 0;
269}
270
271static int lb035q02_panel_spi_probe(struct spi_device *spi)
272{
273	struct panel_drv_data *ddata;
274	struct omap_dss_device *dssdev;
275	int r;
276
277	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
278	if (ddata == NULL)
279		return -ENOMEM;
280
281	dev_set_drvdata(&spi->dev, ddata);
282
283	ddata->spi = spi;
284
285	if (!spi->dev.of_node)
286		return -ENODEV;
287
288	r = lb035q02_probe_of(spi);
289	if (r)
290		return r;
291
292	if (gpio_is_valid(ddata->backlight_gpio)) {
293		r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
294				GPIOF_OUT_INIT_LOW, "panel backlight");
295		if (r)
296			goto err_gpio;
297	}
298
299	ddata->videomode = lb035q02_timings;
300
301	dssdev = &ddata->dssdev;
302	dssdev->dev = &spi->dev;
303	dssdev->driver = &lb035q02_ops;
304	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
305	dssdev->owner = THIS_MODULE;
306	dssdev->panel.timings = ddata->videomode;
307	dssdev->phy.dpi.data_lines = ddata->data_lines;
308
309	r = omapdss_register_display(dssdev);
310	if (r) {
311		dev_err(&spi->dev, "Failed to register panel\n");
312		goto err_reg;
313	}
314
315	return 0;
316
317err_reg:
318err_gpio:
319	omap_dss_put_device(ddata->in);
320	return r;
321}
322
323static int lb035q02_panel_spi_remove(struct spi_device *spi)
324{
325	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
326	struct omap_dss_device *dssdev = &ddata->dssdev;
327	struct omap_dss_device *in = ddata->in;
328
329	omapdss_unregister_display(dssdev);
330
331	lb035q02_disable(dssdev);
332	lb035q02_disconnect(dssdev);
333
334	omap_dss_put_device(in);
335
336	return 0;
337}
338
339static const struct of_device_id lb035q02_of_match[] = {
340	{ .compatible = "omapdss,lgphilips,lb035q02", },
341	{},
342};
343
344MODULE_DEVICE_TABLE(of, lb035q02_of_match);
345
346static struct spi_driver lb035q02_spi_driver = {
347	.probe		= lb035q02_panel_spi_probe,
348	.remove		= lb035q02_panel_spi_remove,
349	.driver		= {
350		.name	= "panel_lgphilips_lb035q02",
351		.of_match_table = lb035q02_of_match,
352		.suppress_bind_attrs = true,
353	},
354};
355
356module_spi_driver(lb035q02_spi_driver);
357
358MODULE_ALIAS("spi:lgphilips,lb035q02");
359MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
360MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
361MODULE_LICENSE("GPL");