2 * LCD / Backlight control code for Sharp SL-6000x (tosa)
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2007,2008 Dmitry Baryshkov
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/spi/spi.h>
17 #include <linux/i2c.h>
18 #include <linux/slab.h>
19 #include <linux/gpio.h>
20 #include <linux/delay.h>
21 #include <linux/lcd.h>
24 #include <asm/mach/sharpsl_param.h>
26 #include <mach/tosa.h>
28 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
30 #define TG_REG0_VQV 0x0001
31 #define TG_REG0_COLOR 0x0002
32 #define TG_REG0_UD 0x0004
33 #define TG_REG0_LR 0x0008
37 struct tosa_lcd_data {
38 struct spi_device *spi;
39 struct lcd_device *lcd;
40 struct i2c_client *i2c;
46 static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
49 struct spi_message msg;
50 struct spi_transfer xfer = {
56 buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
57 spi_message_init(&msg);
58 spi_message_add_tail(&xfer, &msg);
60 return spi_sync(spi, &msg);
63 int tosa_bl_enable(struct spi_device *spi, int enable)
65 /* bl_enable GP04=1 otherwise GP04=0*/
66 return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
68 EXPORT_SYMBOL(tosa_bl_enable);
70 static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
73 gpio_set_value(TOSA_GPIO_TG_ON, 0);
77 /* delayed 0clk TCTL signal for VGA */
78 tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
79 /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
80 tosa_tg_send(data->spi, TG_GPOSR, 0x02);
83 static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
85 struct spi_device *spi = data->spi;
86 int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
91 tosa_tg_send(spi, TG_PNLCTL, value);
93 /* TG LCD pannel power up */
94 tosa_tg_send(spi, TG_PINICTL,0x4);
98 tosa_tg_send(spi, TG_PINICTL,0x0);
101 /* after the pannel is powered up the first time, we can access the i2c bus */
102 /* so probe for the DAC */
103 struct i2c_adapter *adap = i2c_get_adapter(0);
104 struct i2c_board_info info = {
107 .platform_data = data->spi,
109 data->i2c = i2c_new_device(adap, &info);
113 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
115 struct spi_device *spi = data->spi;
117 /* TG LCD VHSA off */
118 tosa_tg_send(spi, TG_PINICTL,0x4);
121 /* TG LCD signal off */
122 tosa_tg_send(spi, TG_PINICTL,0x6);
126 gpio_set_value(TOSA_GPIO_TG_ON, 1);
130 int tosa_lcd_set_power(struct lcd_device *lcd, int power)
132 struct tosa_lcd_data *data = lcd_get_data(lcd);
134 if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
135 tosa_lcd_tg_on(data);
137 if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
138 tosa_lcd_tg_off(data);
140 data->lcd_power = power;
144 static int tosa_lcd_get_power(struct lcd_device *lcd)
146 struct tosa_lcd_data *data = lcd_get_data(lcd);
148 return data->lcd_power;
151 static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
153 struct tosa_lcd_data *data = lcd_get_data(lcd);
155 if (mode->xres == 320 || mode->yres == 320)
156 data->is_vga = false;
160 if (POWER_IS_ON(data->lcd_power))
161 tosa_lcd_tg_on(data);
166 static struct lcd_ops tosa_lcd_ops = {
167 .set_power = tosa_lcd_set_power,
168 .get_power = tosa_lcd_get_power,
169 .set_mode = tosa_lcd_set_mode,
172 static int tosa_lcd_probe(struct spi_device *spi)
175 struct tosa_lcd_data *data;
177 data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
182 data->is_vga = true; /* default to VGA mode */
185 * bits_per_word cannot be configured in platform data
187 spi->bits_per_word = 8;
189 ret = spi_setup(spi);
194 dev_set_drvdata(&spi->dev, data);
196 ret = devm_gpio_request(&spi->dev, TOSA_GPIO_TG_ON, "tg #pwr");
202 ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
207 tosa_lcd_tg_init(data);
209 tosa_lcd_tg_on(data);
211 data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
214 if (IS_ERR(data->lcd)) {
215 ret = PTR_ERR(data->lcd);
223 tosa_lcd_tg_off(data);
225 dev_set_drvdata(&spi->dev, NULL);
229 static int tosa_lcd_remove(struct spi_device *spi)
231 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
233 lcd_device_unregister(data->lcd);
236 i2c_unregister_device(data->i2c);
238 tosa_lcd_tg_off(data);
240 dev_set_drvdata(&spi->dev, NULL);
246 static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
248 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
250 tosa_lcd_tg_off(data);
255 static int tosa_lcd_resume(struct spi_device *spi)
257 struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
259 tosa_lcd_tg_init(data);
260 if (POWER_IS_ON(data->lcd_power))
261 tosa_lcd_tg_on(data);
263 tosa_lcd_tg_off(data);
268 #define tosa_lcd_suspend NULL
269 #define tosa_lcd_resume NULL
272 static struct spi_driver tosa_lcd_driver = {
275 .owner = THIS_MODULE,
277 .probe = tosa_lcd_probe,
278 .remove = tosa_lcd_remove,
279 .suspend = tosa_lcd_suspend,
280 .resume = tosa_lcd_resume,
283 module_spi_driver(tosa_lcd_driver);
285 MODULE_AUTHOR("Dmitry Baryshkov");
286 MODULE_LICENSE("GPL v2");
287 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
288 MODULE_ALIAS("spi:tosa-lcd");