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>
18 #include <linux/gpio/consumer.h>
20 #include <video/omapdss.h>
21 #include <video/omap-panel-data.h>
23 static struct omap_video_timings lb035q02_timings = {
27 .pixelclock = 6500000,
37 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
38 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
39 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
40 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
41 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
44 struct panel_drv_data {
45 struct omap_dss_device dssdev;
46 struct omap_dss_device *in;
48 struct spi_device *spi;
52 struct omap_video_timings videomode;
54 /* used for non-DT boot, to be removed */
57 struct gpio_desc *enable_gpio;
60 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
62 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
64 struct spi_message msg;
65 struct spi_transfer index_xfer = {
69 struct spi_transfer value_xfer = {
74 spi_message_init(&msg);
79 buffer[2] = reg & 0x7f;
80 index_xfer.tx_buf = buffer;
81 spi_message_add_tail(&index_xfer, &msg);
87 value_xfer.tx_buf = buffer + 4;
88 spi_message_add_tail(&value_xfer, &msg);
90 return spi_sync(spi, &msg);
93 static void init_lb035q02_panel(struct spi_device *spi)
95 /* Init sequence from page 28 of the lb035q02 spec */
96 lb035q02_write_reg(spi, 0x01, 0x6300);
97 lb035q02_write_reg(spi, 0x02, 0x0200);
98 lb035q02_write_reg(spi, 0x03, 0x0177);
99 lb035q02_write_reg(spi, 0x04, 0x04c7);
100 lb035q02_write_reg(spi, 0x05, 0xffc0);
101 lb035q02_write_reg(spi, 0x06, 0xe806);
102 lb035q02_write_reg(spi, 0x0a, 0x4008);
103 lb035q02_write_reg(spi, 0x0b, 0x0000);
104 lb035q02_write_reg(spi, 0x0d, 0x0030);
105 lb035q02_write_reg(spi, 0x0e, 0x2800);
106 lb035q02_write_reg(spi, 0x0f, 0x0000);
107 lb035q02_write_reg(spi, 0x16, 0x9f80);
108 lb035q02_write_reg(spi, 0x17, 0x0a0f);
109 lb035q02_write_reg(spi, 0x1e, 0x00c1);
110 lb035q02_write_reg(spi, 0x30, 0x0300);
111 lb035q02_write_reg(spi, 0x31, 0x0007);
112 lb035q02_write_reg(spi, 0x32, 0x0000);
113 lb035q02_write_reg(spi, 0x33, 0x0000);
114 lb035q02_write_reg(spi, 0x34, 0x0707);
115 lb035q02_write_reg(spi, 0x35, 0x0004);
116 lb035q02_write_reg(spi, 0x36, 0x0302);
117 lb035q02_write_reg(spi, 0x37, 0x0202);
118 lb035q02_write_reg(spi, 0x3a, 0x0a0d);
119 lb035q02_write_reg(spi, 0x3b, 0x0806);
122 static int lb035q02_connect(struct omap_dss_device *dssdev)
124 struct panel_drv_data *ddata = to_panel_data(dssdev);
125 struct omap_dss_device *in = ddata->in;
128 if (omapdss_device_is_connected(dssdev))
131 r = in->ops.dpi->connect(in, dssdev);
135 init_lb035q02_panel(ddata->spi);
140 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
142 struct panel_drv_data *ddata = to_panel_data(dssdev);
143 struct omap_dss_device *in = ddata->in;
145 if (!omapdss_device_is_connected(dssdev))
148 in->ops.dpi->disconnect(in, dssdev);
151 static int lb035q02_enable(struct omap_dss_device *dssdev)
153 struct panel_drv_data *ddata = to_panel_data(dssdev);
154 struct omap_dss_device *in = ddata->in;
157 if (!omapdss_device_is_connected(dssdev))
160 if (omapdss_device_is_enabled(dssdev))
163 if (ddata->data_lines)
164 in->ops.dpi->set_data_lines(in, ddata->data_lines);
165 in->ops.dpi->set_timings(in, &ddata->videomode);
167 r = in->ops.dpi->enable(in);
171 if (ddata->enable_gpio)
172 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
174 if (gpio_is_valid(ddata->backlight_gpio))
175 gpio_set_value_cansleep(ddata->backlight_gpio, 1);
177 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
182 static void lb035q02_disable(struct omap_dss_device *dssdev)
184 struct panel_drv_data *ddata = to_panel_data(dssdev);
185 struct omap_dss_device *in = ddata->in;
187 if (!omapdss_device_is_enabled(dssdev))
190 if (ddata->enable_gpio)
191 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
193 if (gpio_is_valid(ddata->backlight_gpio))
194 gpio_set_value_cansleep(ddata->backlight_gpio, 0);
196 in->ops.dpi->disable(in);
198 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
201 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
202 struct omap_video_timings *timings)
204 struct panel_drv_data *ddata = to_panel_data(dssdev);
205 struct omap_dss_device *in = ddata->in;
207 ddata->videomode = *timings;
208 dssdev->panel.timings = *timings;
210 in->ops.dpi->set_timings(in, timings);
213 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
214 struct omap_video_timings *timings)
216 struct panel_drv_data *ddata = to_panel_data(dssdev);
218 *timings = ddata->videomode;
221 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
222 struct omap_video_timings *timings)
224 struct panel_drv_data *ddata = to_panel_data(dssdev);
225 struct omap_dss_device *in = ddata->in;
227 return in->ops.dpi->check_timings(in, timings);
230 static struct omap_dss_driver lb035q02_ops = {
231 .connect = lb035q02_connect,
232 .disconnect = lb035q02_disconnect,
234 .enable = lb035q02_enable,
235 .disable = lb035q02_disable,
237 .set_timings = lb035q02_set_timings,
238 .get_timings = lb035q02_get_timings,
239 .check_timings = lb035q02_check_timings,
241 .get_resolution = omapdss_default_get_resolution,
244 static int lb035q02_probe_of(struct spi_device *spi)
246 struct device_node *node = spi->dev.of_node;
247 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
248 struct omap_dss_device *in;
249 struct gpio_desc *gpio;
251 gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
253 dev_err(&spi->dev, "failed to parse enable gpio\n");
254 return PTR_ERR(gpio);
257 ddata->enable_gpio = gpio;
259 ddata->backlight_gpio = -ENOENT;
261 in = omapdss_of_find_source_for_first_ep(node);
263 dev_err(&spi->dev, "failed to find video source\n");
272 static int lb035q02_panel_spi_probe(struct spi_device *spi)
274 struct panel_drv_data *ddata;
275 struct omap_dss_device *dssdev;
278 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
282 dev_set_drvdata(&spi->dev, ddata);
286 if (!spi->dev.of_node)
289 r = lb035q02_probe_of(spi);
293 if (gpio_is_valid(ddata->backlight_gpio)) {
294 r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
295 GPIOF_OUT_INIT_LOW, "panel backlight");
300 ddata->videomode = lb035q02_timings;
302 dssdev = &ddata->dssdev;
303 dssdev->dev = &spi->dev;
304 dssdev->driver = &lb035q02_ops;
305 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
306 dssdev->owner = THIS_MODULE;
307 dssdev->panel.timings = ddata->videomode;
308 dssdev->phy.dpi.data_lines = ddata->data_lines;
310 r = omapdss_register_display(dssdev);
312 dev_err(&spi->dev, "Failed to register panel\n");
320 omap_dss_put_device(ddata->in);
324 static int lb035q02_panel_spi_remove(struct spi_device *spi)
326 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
327 struct omap_dss_device *dssdev = &ddata->dssdev;
328 struct omap_dss_device *in = ddata->in;
330 omapdss_unregister_display(dssdev);
332 lb035q02_disable(dssdev);
333 lb035q02_disconnect(dssdev);
335 omap_dss_put_device(in);
340 static const struct of_device_id lb035q02_of_match[] = {
341 { .compatible = "omapdss,lgphilips,lb035q02", },
345 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
347 static struct spi_driver lb035q02_spi_driver = {
348 .probe = lb035q02_panel_spi_probe,
349 .remove = lb035q02_panel_spi_remove,
351 .name = "panel_lgphilips_lb035q02",
352 .of_match_table = lb035q02_of_match,
353 .suppress_bind_attrs = true,
357 module_spi_driver(lb035q02_spi_driver);
359 MODULE_ALIAS("spi:lgphilips,lb035q02");
360 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
361 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
362 MODULE_LICENSE("GPL");