/*
* LCD / Backlight control code for Sharp SL-6000x (tosa)
*
* Copyright (c) 2005 Dirk Opfer
* Copyright (c) 2007,2008 Dmitry Baryshkov
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/lcd.h>
#include <linux/fb.h>
#include <asm/mach/sharpsl_param.h>
#include <mach/tosa.h>
#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
#define TG_REG0_VQV 0x0001
#define TG_REG0_COLOR 0x0002
#define TG_REG0_UD 0x0004
#define TG_REG0_LR 0x0008
#define DAC_BASE 0x4e
struct tosa_lcd_data {
struct spi_device *spi;
struct lcd_device *lcd;
struct i2c_client *i2c;
int lcd_power;
bool is_vga;
};
static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
{
u8 buf[1];
struct spi_message msg;
struct spi_transfer xfer = {
.len = 1,
.cs_change = 1,
.tx_buf = buf,
};
buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
return spi_sync(spi, &msg);
}
int tosa_bl_enable(struct spi_device *spi, int enable)
{
/* bl_enable GP04=1 otherwise GP04=0*/
return tosa_tg_send(spi, TG_GPODR2, enable? 0x01 : 0x00);
}
EXPORT_SYMBOL(tosa_bl_enable);
static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
{
/* TG on */
gpio_set_value(TOSA_GPIO_TG_ON, 0);
mdelay(60);
/* delayed 0clk TCTL signal for VGA */
tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
/* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
tosa_tg_send(data->spi, TG_GPOSR, 0x02);
}
static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
{
struct spi_device *spi = data->spi;
int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
if (data->is_vga)
value |= TG_REG0_VQV;
tosa_tg_send(spi, TG_PNLCTL, value);
/* TG LCD pannel power up */
tosa_tg_send(spi, TG_PINICTL,0x4);
mdelay(50);
/* TG LCD GVSS */
tosa_tg_send(spi, TG_PINICTL,0x0);
if (!data->i2c) {
/* after the pannel is powered up the first time, we can access the i2c bus */
/* so probe for the DAC */
struct i2c_adapter *adap = i2c_get_adapter(0);
struct i2c_board_info info = {
.type = "tosa-bl",
.addr = DAC_BASE,
.platform_data = data->spi,
};
data->i2c = i2c_new_device(adap, &info);
}
}
static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
{
struct spi_device *spi = data->spi;
/* TG LCD VHSA off */
tosa_tg_send(spi, TG_PINICTL,0x4);
mdelay(50);
/* TG LCD signal off */
tosa_tg_send(spi, TG_PINICTL,0x6);
mdelay(50);
/* TG Off */
gpio_set_value(TOSA_GPIO_TG_ON, 1);
mdelay(100);
}
int tosa_lcd_set_power(struct lcd_device *lcd, int power)
{
struct tosa_lcd_data *data = lcd_get_data(lcd);
if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
tosa_lcd_tg_on(data);
if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
tosa_lcd_tg_off(data);
data->lcd_power = power;
return 0;
}
static int tosa_lcd_get_power(struct lcd_device *lcd)
{
struct tosa_lcd_data *data = lcd_get_data(lcd);
return data->lcd_power;
}
static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
{
struct tosa_lcd_data *data = lcd_get_data(lcd);
if (mode->xres == 320 || mode->yres == 320)
data->is_vga = false;
else
data->is_vga = true;
if (POWER_IS_ON(data->lcd_power))
tosa_lcd_tg_on(data);
return 0;
}
static struct lcd_ops tosa_lcd_ops = {
.set_power = tosa_lcd_set_power,
.get_power = tosa_lcd_get_power,
.set_mode = tosa_lcd_set_mode,
};
static int __devinit tosa_lcd_probe(struct spi_device *spi)
{
int ret;
struct tosa_lcd_data *data;
data = kzalloc(sizeof(struct tosa_lcd_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->is_vga = true; /* default to VGA mode */
/*
* bits_per_word cannot be configured in platform data
*/
spi->bits_per_word = 8;
ret = spi_setup(spi);
if (ret < 0)
goto err_spi;
data->spi = spi;
dev_set_drvdata(&spi->dev, data);
ret = gpio_request(TOSA_GPIO_TG_ON, "tg #pwr");
if (ret < 0)
goto err_gpio_tg;
mdelay(60);
ret = gpio_direction_output(TOSA_GPIO_TG_ON, 0);
if (ret < 0)
goto err_gpio_dir;
mdelay(60);
tosa_lcd_tg_init(data);
tosa_lcd_tg_on(data);
data->lcd = lcd_device_register("tosa-lcd", &spi->dev, data,
&tosa_lcd_ops);
if (IS_ERR(data->lcd)) {
ret = PTR_ERR(data->lcd);
data->lcd = NULL;
goto err_register;
}
return 0;
err_register:
tosa_lcd_tg_off(data);
err_gpio_dir:
gpio_free(TOSA_GPIO_TG_ON);
err_gpio_tg:
dev_set_drvdata(&spi->dev, NULL);
err_spi:
kfree(data);
return ret;
}
static int __devexit tosa_lcd_remove(struct spi_device *spi)
{
struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
lcd_device_unregister(data->lcd);
if (data->i2c)
i2c_unregister_device(data->i2c);
tosa_lcd_tg_off(data);
gpio_free(TOSA_GPIO_TG_ON);
dev_set_drvdata(&spi->dev, NULL);
kfree(data);
return 0;
}
#ifdef CONFIG_PM
static int tosa_lcd_suspend(struct spi_device *spi, pm_message_t state)
{
struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
tosa_lcd_tg_off(data);
return 0;
}
static int tosa_lcd_resume(struct spi_device *spi)
{
struct tosa_lcd_data *data = dev_get_drvdata(&spi->dev);
tosa_lcd_tg_init(data);
if (POWER_IS_ON(data->lcd_power))
tosa_lcd_tg_on(data);
else
tosa_lcd_tg_off(data);
return 0;
}
#else
#define tosa_lcd_suspend NULL
#define tosa_lcd_reume NULL
#endif
static struct spi_driver tosa_lcd_driver = {
.driver = {
.name = "tosa-lcd",
.owner = THIS_MODULE,
},
.probe = tosa_lcd_probe,
.remove = __devexit_p(tosa_lcd_remove),
.suspend = tosa_lcd_suspend,
.resume = tosa_lcd_resume,
};
static int __init tosa_lcd_init(void)
{
return spi_register_driver(&tosa_lcd_driver);
}
static void __exit tosa_lcd_exit(void)
{
spi_unregister_driver(&tosa_lcd_driver);
}
module_init(tosa_lcd_init);
module_exit(tosa_lcd_exit);
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
MODULE_ALIAS("spi:tosa-lcd");
