2 * LG.Philips LB035Q02 LCD Panel driver
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>
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.
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>
19 #include <video/omapdss.h>
20 #include <video/omap-panel-data.h>
22 static struct omap_video_timings lb035q02_timings = {
26 .pixelclock = 6500000,
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,
43 struct panel_drv_data {
44 struct omap_dss_device dssdev;
45 struct omap_dss_device *in;
47 struct spi_device *spi;
51 struct omap_video_timings videomode;
53 /* used for non-DT boot, to be removed */
56 struct gpio_desc *enable_gpio;
59 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
61 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
63 struct spi_message msg;
64 struct spi_transfer index_xfer = {
68 struct spi_transfer value_xfer = {
73 spi_message_init(&msg);
78 buffer[2] = reg & 0x7f;
79 index_xfer.tx_buf = buffer;
80 spi_message_add_tail(&index_xfer, &msg);
86 value_xfer.tx_buf = buffer + 4;
87 spi_message_add_tail(&value_xfer, &msg);
89 return spi_sync(spi, &msg);
92 static void init_lb035q02_panel(struct spi_device *spi)
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);
121 static int lb035q02_connect(struct omap_dss_device *dssdev)
123 struct panel_drv_data *ddata = to_panel_data(dssdev);
124 struct omap_dss_device *in = ddata->in;
127 if (omapdss_device_is_connected(dssdev))
130 r = in->ops.dpi->connect(in, dssdev);
134 init_lb035q02_panel(ddata->spi);
139 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
141 struct panel_drv_data *ddata = to_panel_data(dssdev);
142 struct omap_dss_device *in = ddata->in;
144 if (!omapdss_device_is_connected(dssdev))
147 in->ops.dpi->disconnect(in, dssdev);
150 static int lb035q02_enable(struct omap_dss_device *dssdev)
152 struct panel_drv_data *ddata = to_panel_data(dssdev);
153 struct omap_dss_device *in = ddata->in;
156 if (!omapdss_device_is_connected(dssdev))
159 if (omapdss_device_is_enabled(dssdev))
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);
166 r = in->ops.dpi->enable(in);
170 if (ddata->enable_gpio)
171 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
173 if (gpio_is_valid(ddata->backlight_gpio))
174 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
176 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
181 static void lb035q02_disable(struct omap_dss_device *dssdev)
183 struct panel_drv_data *ddata = to_panel_data(dssdev);
184 struct omap_dss_device *in = ddata->in;
186 if (!omapdss_device_is_enabled(dssdev))
189 if (ddata->enable_gpio)
190 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
192 if (gpio_is_valid(ddata->backlight_gpio))
193 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
195 in->ops.dpi->disable(in);
197 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
200 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
201 struct omap_video_timings *timings)
203 struct panel_drv_data *ddata = to_panel_data(dssdev);
204 struct omap_dss_device *in = ddata->in;
206 ddata->videomode = *timings;
207 dssdev->panel.timings = *timings;
209 in->ops.dpi->set_timings(in, timings);
212 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
213 struct omap_video_timings *timings)
215 struct panel_drv_data *ddata = to_panel_data(dssdev);
217 *timings = ddata->videomode;
220 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
221 struct omap_video_timings *timings)
223 struct panel_drv_data *ddata = to_panel_data(dssdev);
224 struct omap_dss_device *in = ddata->in;
226 return in->ops.dpi->check_timings(in, timings);
229 static struct omap_dss_driver lb035q02_ops = {
230 .connect = lb035q02_connect,
231 .disconnect = lb035q02_disconnect,
233 .enable = lb035q02_enable,
234 .disable = lb035q02_disable,
236 .set_timings = lb035q02_set_timings,
237 .get_timings = lb035q02_get_timings,
238 .check_timings = lb035q02_check_timings,
240 .get_resolution = omapdss_default_get_resolution,
243 static int lb035q02_probe_pdata(struct spi_device *spi)
245 const struct panel_lb035q02_platform_data *pdata;
246 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
247 struct omap_dss_device *dssdev, *in;
250 pdata = dev_get_platdata(&spi->dev);
252 in = omap_dss_find_output(pdata->source);
254 dev_err(&spi->dev, "failed to find video source '%s'\n",
256 return -EPROBE_DEFER;
261 ddata->data_lines = pdata->data_lines;
263 dssdev = &ddata->dssdev;
264 dssdev->name = pdata->name;
266 r = devm_gpio_request_one(&spi->dev, pdata->enable_gpio,
267 GPIOF_OUT_INIT_LOW, "panel enable");
271 ddata->enable_gpio = gpio_to_desc(pdata->enable_gpio);
273 ddata->backlight_gpio = pdata->backlight_gpio;
277 omap_dss_put_device(ddata->in);
281 static int lb035q02_probe_of(struct spi_device *spi)
283 struct device_node *node = spi->dev.of_node;
284 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
285 struct omap_dss_device *in;
286 struct gpio_desc *gpio;
288 gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
290 dev_err(&spi->dev, "failed to parse enable gpio\n");
291 return PTR_ERR(gpio);
294 ddata->enable_gpio = gpio;
296 ddata->backlight_gpio = -ENOENT;
298 in = omapdss_of_find_source_for_first_ep(node);
300 dev_err(&spi->dev, "failed to find video source\n");
309 static int lb035q02_panel_spi_probe(struct spi_device *spi)
311 struct panel_drv_data *ddata;
312 struct omap_dss_device *dssdev;
315 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
319 dev_set_drvdata(&spi->dev, ddata);
323 if (dev_get_platdata(&spi->dev)) {
324 r = lb035q02_probe_pdata(spi);
327 } else if (spi->dev.of_node) {
328 r = lb035q02_probe_of(spi);
335 if (gpio_is_valid(ddata->backlight_gpio)) {
336 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
337 GPIOF_OUT_INIT_LOW, "panel backlight");
342 ddata->videomode = lb035q02_timings;
344 dssdev = &ddata->dssdev;
345 dssdev->dev = &spi->dev;
346 dssdev->driver = &lb035q02_ops;
347 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
348 dssdev->owner = THIS_MODULE;
349 dssdev->panel.timings = ddata->videomode;
350 dssdev->phy.dpi.data_lines = ddata->data_lines;
352 r = omapdss_register_display(dssdev);
354 dev_err(&spi->dev, "Failed to register panel\n");
362 omap_dss_put_device(ddata->in);
366 static int lb035q02_panel_spi_remove(struct spi_device *spi)
368 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
369 struct omap_dss_device *dssdev = &ddata->dssdev;
370 struct omap_dss_device *in = ddata->in;
372 omapdss_unregister_display(dssdev);
374 lb035q02_disable(dssdev);
375 lb035q02_disconnect(dssdev);
377 omap_dss_put_device(in);
382 static const struct of_device_id lb035q02_of_match[] = {
383 { .compatible = "omapdss,lgphilips,lb035q02", },
387 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
389 static struct spi_driver lb035q02_spi_driver = {
390 .probe = lb035q02_panel_spi_probe,
391 .remove = lb035q02_panel_spi_remove,
393 .name = "panel_lgphilips_lb035q02",
394 .of_match_table = lb035q02_of_match,
395 .suppress_bind_attrs = true,
399 module_spi_driver(lb035q02_spi_driver);
401 MODULE_ALIAS("spi:lgphilips,lb035q02");
402 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
403 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
404 MODULE_LICENSE("GPL");