2 * LG.Philips LB035Q02 LCD Panel driver
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
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 "../dss/omapdss.h"
22 static const struct videomode lb035q02_vm = {
26 .pixelclock = 6500000,
36 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
39 struct panel_drv_data {
40 struct omap_dss_device dssdev;
42 struct spi_device *spi;
46 struct gpio_desc *enable_gpio;
49 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
51 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
53 struct spi_message msg;
54 struct spi_transfer index_xfer = {
58 struct spi_transfer value_xfer = {
63 spi_message_init(&msg);
68 buffer[2] = reg & 0x7f;
69 index_xfer.tx_buf = buffer;
70 spi_message_add_tail(&index_xfer, &msg);
76 value_xfer.tx_buf = buffer + 4;
77 spi_message_add_tail(&value_xfer, &msg);
79 return spi_sync(spi, &msg);
82 static void init_lb035q02_panel(struct spi_device *spi)
84 /* Init sequence from page 28 of the lb035q02 spec */
85 lb035q02_write_reg(spi, 0x01, 0x6300);
86 lb035q02_write_reg(spi, 0x02, 0x0200);
87 lb035q02_write_reg(spi, 0x03, 0x0177);
88 lb035q02_write_reg(spi, 0x04, 0x04c7);
89 lb035q02_write_reg(spi, 0x05, 0xffc0);
90 lb035q02_write_reg(spi, 0x06, 0xe806);
91 lb035q02_write_reg(spi, 0x0a, 0x4008);
92 lb035q02_write_reg(spi, 0x0b, 0x0000);
93 lb035q02_write_reg(spi, 0x0d, 0x0030);
94 lb035q02_write_reg(spi, 0x0e, 0x2800);
95 lb035q02_write_reg(spi, 0x0f, 0x0000);
96 lb035q02_write_reg(spi, 0x16, 0x9f80);
97 lb035q02_write_reg(spi, 0x17, 0x0a0f);
98 lb035q02_write_reg(spi, 0x1e, 0x00c1);
99 lb035q02_write_reg(spi, 0x30, 0x0300);
100 lb035q02_write_reg(spi, 0x31, 0x0007);
101 lb035q02_write_reg(spi, 0x32, 0x0000);
102 lb035q02_write_reg(spi, 0x33, 0x0000);
103 lb035q02_write_reg(spi, 0x34, 0x0707);
104 lb035q02_write_reg(spi, 0x35, 0x0004);
105 lb035q02_write_reg(spi, 0x36, 0x0302);
106 lb035q02_write_reg(spi, 0x37, 0x0202);
107 lb035q02_write_reg(spi, 0x3a, 0x0a0d);
108 lb035q02_write_reg(spi, 0x3b, 0x0806);
111 static int lb035q02_connect(struct omap_dss_device *src,
112 struct omap_dss_device *dst)
114 struct panel_drv_data *ddata = to_panel_data(dst);
116 init_lb035q02_panel(ddata->spi);
121 static void lb035q02_disconnect(struct omap_dss_device *src,
122 struct omap_dss_device *dst)
126 static void lb035q02_enable(struct omap_dss_device *dssdev)
128 struct panel_drv_data *ddata = to_panel_data(dssdev);
130 if (ddata->enable_gpio)
131 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
134 static void lb035q02_disable(struct omap_dss_device *dssdev)
136 struct panel_drv_data *ddata = to_panel_data(dssdev);
138 if (ddata->enable_gpio)
139 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
142 static int lb035q02_get_modes(struct omap_dss_device *dssdev,
143 struct drm_connector *connector)
145 struct panel_drv_data *ddata = to_panel_data(dssdev);
147 return omapdss_display_get_modes(connector, &ddata->vm);
150 static const struct omap_dss_device_ops lb035q02_ops = {
151 .connect = lb035q02_connect,
152 .disconnect = lb035q02_disconnect,
154 .enable = lb035q02_enable,
155 .disable = lb035q02_disable,
157 .get_modes = lb035q02_get_modes,
160 static int lb035q02_probe_of(struct spi_device *spi)
162 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
163 struct gpio_desc *gpio;
165 gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
167 dev_err(&spi->dev, "failed to parse enable gpio\n");
168 return PTR_ERR(gpio);
171 ddata->enable_gpio = gpio;
176 static int lb035q02_panel_spi_probe(struct spi_device *spi)
178 struct panel_drv_data *ddata;
179 struct omap_dss_device *dssdev;
182 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
186 dev_set_drvdata(&spi->dev, ddata);
190 r = lb035q02_probe_of(spi);
194 ddata->vm = lb035q02_vm;
196 dssdev = &ddata->dssdev;
197 dssdev->dev = &spi->dev;
198 dssdev->ops = &lb035q02_ops;
199 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
200 dssdev->display = true;
201 dssdev->owner = THIS_MODULE;
202 dssdev->of_ports = BIT(0);
203 dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
206 * Note: According to the panel documentation:
208 * DATA needs to be driven on the FALLING edge
210 dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH
211 | DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE
212 | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
214 omapdss_display_init(dssdev);
215 omapdss_device_register(dssdev);
220 static int lb035q02_panel_spi_remove(struct spi_device *spi)
222 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
223 struct omap_dss_device *dssdev = &ddata->dssdev;
225 omapdss_device_unregister(dssdev);
227 lb035q02_disable(dssdev);
232 static const struct of_device_id lb035q02_of_match[] = {
233 { .compatible = "omapdss,lgphilips,lb035q02", },
237 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
239 static struct spi_driver lb035q02_spi_driver = {
240 .probe = lb035q02_panel_spi_probe,
241 .remove = lb035q02_panel_spi_remove,
243 .name = "panel_lgphilips_lb035q02",
244 .of_match_table = lb035q02_of_match,
245 .suppress_bind_attrs = true,
249 module_spi_driver(lb035q02_spi_driver);
251 MODULE_ALIAS("spi:lgphilips,lb035q02");
252 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
253 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
254 MODULE_LICENSE("GPL");