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/*
* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
* Driver for Ilitek ili8960 LCD
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/lcd.h>
#include <linux/backlight.h>
#include <linux/delay.h>
struct ili8960 {
struct spi_device *spi;
struct lcd_device *lcd;
struct backlight_device *bl;
bool enabled;
int brightness;
};
static int ili8960_write_reg(struct spi_device *spi, uint8_t reg,
uint8_t data)
{
uint8_t buf[2];
buf[0] = ((reg & 0x40) << 1) | (reg & 0x3f);
buf[1] = data;
return spi_write(spi, buf, sizeof(buf));
}
static int ili8960_programm_power(struct spi_device *spi, bool enabled)
{
int ret;
if (enabled)
mdelay(20);
ret = ili8960_write_reg(spi, 0x5, enabled ? 0xc7 : 0xc6);
if (!enabled)
mdelay(20);
return ret;
}
static int ili8960_set_power(struct lcd_device *lcd, int power)
{
struct ili8960 *ili8960 = lcd_get_data(lcd);
switch (power) {
case FB_BLANK_UNBLANK:
ili8960->enabled = true;
break;
default:
ili8960->enabled = false;
break;
}
return ili8960_programm_power(ili8960->spi, ili8960->enabled);
}
static int ili8960_get_power(struct lcd_device *lcd)
{
return ili8960->enabled ? FB_BLANK_UNBLANK : FB_BLANK_BLANK;
}
static int ili8960_set_contrast(struct lcd_device *lcd, int contrast)
{
struct ili8960 *ili8960 = lcd_get_data(lcd);
ili8960_write_reg(ili8960->spi, 0x0d, contrast);
return 0;
}
static int ili8960_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
{
if (mode->xres != 320 && mode->yres != 240)
return -EINVAL;
return 0;
}
static int ili8960_set_brightness(struct ili8960 *ili8960, int brightness)
{
int ret;
ret = ili8960_write_reg(ili8960->spi, 0x3, brightness);
if (ret == 0)
ili8960->brightness = brightness;
return ret;
}
static ssize_t ili8960_show_brightness(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", ili8960->brightness);
}
static ssize_t ili8960_store_brightness(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
char *endp;
struct lcd_device *ld = to_lcd_device(dev);
struct ili8960 *ili8960 = lcd_get_data(ld);
int brightness = simple_strtoul(buf, &endp, 0);
if (brightness > 255 || brightness < 0)
return -EINVAL;
ili8960_set_brightness(ili8960, brightness);
return count;
}
static DEVICE_ATTR(brightness, 0644, ili8960_show_brightness,
ili8960_store_brightness);
static struct lcd_ops ili8960_lcd_ops = {
.set_power = ili8960_set_power,
.get_power = ili8960_get_power,
.set_contrast = ili8960_set_contrast,
.set_mode = ili8960_set_mode,
};
static int __devinit ili8960_probe(struct spi_device *spi)
{
int ret;
struct ili8960 *ili8960;
ili8960 = kmalloc(sizeof(*ili8960), GFP_KERNEL);
spi->bits_per_word = 8;
spi->mode = SPI_MODE_3 | SPI_3WIRE;
ret = spi_setup(spi);
if (ret) {
dev_err(&spi->dev, "Failed to setup spi\n");
goto err_free_ili8960;
}
ili8960->spi = spi;
ili8960->lcd = lcd_device_register("ili8960-lcd", &spi->dev, ili8960,
&ili8960_lcd_ops);
if (IS_ERR(ili8960->lcd)) {
ret = PTR_ERR(ili8960->lcd);
dev_err(&spi->dev, "Failed to register lcd device: %d\n", ret);
goto err_free_ili8960;
}
ili8960->lcd->props.max_contrast = 255;
ret = device_create_file(&ili8960->lcd->dev, &dev_attr_brightness);
if (ret)
goto err_unregister_lcd;
ili8960_programm_power(ili8960->spi, true);
ili8960->enabled = true;
dev_set_drvdata(&spi->dev, ili8960);
/*
ili8960_write_reg(spi, 0x13, 0x01);
ili8960_write_reg(spi, 0x5, 0xc7);
*/
return 0;
err_unregister_lcd:
lcd_device_unregister(ili8960->lcd);
err_free_ili8960:
kfree(ili8960);
return ret;
}
static int __devexit ili8960_remove(struct spi_device *spi)
{
struct ili8960 *ili8960 = spi_get_drvdata(spi);
device_remove_file(&ili8960->lcd->dev, &dev_attr_brightness);
lcd_device_unregister(ili8960->lcd);
spi_set_drvdata(spi, NULL);
kfree(ili8960);
return 0;
}
#ifdef CONFIG_PM
static int ili8960_suspend(struct spi_device *spi, pm_message_t state)
{
struct ili8960 *ili8960 = spi_get_drvdata(spi);
if (ili8960->enabled)
ili8960_programm_power(ili8960->spi, false);
return 0;
}
static int ili8960_resume(struct spi_device *spi)
{
struct ili8960 *ili8960 = spi_get_drvdata(spi);
if (ili8960->enabled)
ili8960_programm_power(ili8960->spi, true);
return 0;
}
#else
#define ili8960_suspend NULL
#define ili8960_resume NULL
#endif
static struct spi_driver ili8960_driver = {
.driver = {
.name = "ili8960",
.owner = THIS_MODULE,
},
.probe = ili8960_probe,
.remove = __devexit_p(ili8960_remove),
.suspend = ili8960_suspend,
.resume = ili8960_resume,
};
static int __init ili8960_init(void)
{
return spi_register_driver(&ili8960_driver);
}
module_init(ili8960_init);
static void __exit ili8960_exit(void)
{
spi_unregister_driver(&ili8960_driver);
}
module_exit(ili8960_exit)
MODULE_AUTHOR("Lars-Peter Clausen");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LCD driver for Ilitek ili8960");
MODULE_ALIAS("spi:ili8960");
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