backlight: add support for Sharp SL-6000 LCD and backlight drivers

On Sharp SL-6000 lcd/backlight is a bit complex, so add two drivers
one for lcd-driving chip, other one for dac regulating the backlight
LEDS.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
This commit is contained in:
Dmitry Baryshkov 2008-09-13 20:58:51 +04:00 committed by Richard Purdie
parent 6da0b38f44
commit fbd1b17b43
5 changed files with 502 additions and 0 deletions

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@ -193,4 +193,7 @@
#define TOSA_KEY_MAIL KEY_MAIL
#endif
struct spi_device;
extern int tosa_bl_enable(struct spi_device *spi, int enable);
#endif /* _ASM_ARCH_TOSA_H_ */

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@ -75,6 +75,15 @@ config LCD_PLATFORM
This driver provides a platform-device registered LCD power
control interface.
config LCD_TOSA
tristate "Sharp SL-6000 LCD Driver"
depends on LCD_CLASS_DEVICE && SPI
depends on MACH_TOSA
default n
help
If you have an Sharp SL-6000 Zaurus say Y to enable a driver
for its LCD.
#
# Backlight
#
@ -179,3 +188,12 @@ config BACKLIGHT_MBP_NVIDIA
If you have an Apple Macbook Pro with Nvidia graphics hardware say Y
to enable a driver for its backlight
config BACKLIGHT_TOSA
tristate "Sharp SL-6000 Backlight Driver"
depends on BACKLIGHT_CLASS_DEVICE && I2C
depends on MACH_TOSA && LCD_TOSA
default n
help
If you have an Sharp SL-6000 Zaurus say Y to enable a driver
for its backlight

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@ -7,6 +7,7 @@ obj-$(CONFIG_LCD_ILI9320) += ili9320.o
obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
obj-$(CONFIG_LCD_TDO24M) += tdo24m.o
obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o
obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o
@ -18,4 +19,6 @@ obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o

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@ -0,0 +1,198 @@
/*
* 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/gpio.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <asm/mach/sharpsl_param.h>
#include <mach/tosa.h>
#define COMADJ_DEFAULT 97
#define DAC_CH1 0
#define DAC_CH2 1
struct tosa_bl_data {
struct i2c_client *i2c;
struct backlight_device *bl;
int comadj;
};
static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
{
struct spi_device *spi = data->i2c->dev.platform_data;
i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
/* SetBacklightDuty */
i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
/* SetBacklightVR */
gpio_set_value(TOSA_GPIO_BL_C20MA, brightness & 0x100);
tosa_bl_enable(spi, brightness);
}
static int tosa_bl_update_status(struct backlight_device *dev)
{
struct backlight_properties *props = &dev->props;
struct tosa_bl_data *data = dev_get_drvdata(&dev->dev);
int power = max(props->power, props->fb_blank);
int brightness = props->brightness;
if (power)
brightness = 0;
tosa_bl_set_backlight(data, brightness);
return 0;
}
static int tosa_bl_get_brightness(struct backlight_device *dev)
{
struct backlight_properties *props = &dev->props;
return props->brightness;
}
static struct backlight_ops bl_ops = {
.get_brightness = tosa_bl_get_brightness,
.update_status = tosa_bl_update_status,
};
static int __devinit tosa_bl_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tosa_bl_data *data = kzalloc(sizeof(struct tosa_bl_data), GFP_KERNEL);
int ret = 0;
if (!data)
return -ENOMEM;
data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
ret = gpio_request(TOSA_GPIO_BL_C20MA, "backlight");
if (ret) {
dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
goto err_gpio_bl;
}
ret = gpio_direction_output(TOSA_GPIO_BL_C20MA, 0);
if (ret)
goto err_gpio_dir;
i2c_set_clientdata(client, data);
data->i2c = client;
data->bl = backlight_device_register("tosa-bl", &client->dev,
data, &bl_ops);
if (IS_ERR(data->bl)) {
ret = PTR_ERR(data->bl);
goto err_reg;
}
data->bl->props.brightness = 69;
data->bl->props.max_brightness = 512 - 1;
data->bl->props.power = FB_BLANK_UNBLANK;
backlight_update_status(data->bl);
return 0;
err_reg:
data->bl = NULL;
i2c_set_clientdata(client, NULL);
err_gpio_dir:
gpio_free(TOSA_GPIO_BL_C20MA);
err_gpio_bl:
kfree(data);
return ret;
}
static int __devexit tosa_bl_remove(struct i2c_client *client)
{
struct tosa_bl_data *data = i2c_get_clientdata(client);
backlight_device_unregister(data->bl);
data->bl = NULL;
i2c_set_clientdata(client, NULL);
gpio_free(TOSA_GPIO_BL_C20MA);
kfree(data);
return 0;
}
#ifdef CONFIG_PM
static int tosa_bl_suspend(struct i2c_client *client, pm_message_t pm)
{
struct tosa_bl_data *data = i2c_get_clientdata(client);
tosa_bl_set_backlight(data, 0);
return 0;
}
static int tosa_bl_resume(struct i2c_client *client)
{
struct tosa_bl_data *data = i2c_get_clientdata(client);
backlight_update_status(data->bl);
return 0;
}
#else
#define tosa_bl_suspend NULL
#define tosa_bl_resume NULL
#endif
static const struct i2c_device_id tosa_bl_id[] = {
{ "tosa-bl", 0 },
{ },
};
static struct i2c_driver tosa_bl_driver = {
.driver = {
.name = "tosa-bl",
.owner = THIS_MODULE,
},
.probe = tosa_bl_probe,
.remove = __devexit_p(tosa_bl_remove),
.suspend = tosa_bl_suspend,
.resume = tosa_bl_resume,
.id_table = tosa_bl_id,
};
static int __init tosa_bl_init(void)
{
return i2c_add_driver(&tosa_bl_driver);
}
static void __exit tosa_bl_exit(void)
{
i2c_del_driver(&tosa_bl_driver);
}
module_init(tosa_bl_init);
module_exit(tosa_bl_exit);
MODULE_AUTHOR("Dmitry Baryshkov");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");

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@ -0,0 +1,280 @@
/*
* 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/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;
};
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;
const int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
tosa_tg_send(spi, TG_PNLCTL, value | TG_REG0_VQV); /* this depends on mode */
/* 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 struct lcd_ops tosa_lcd_ops = {
.set_power = tosa_lcd_set_power,
.get_power = tosa_lcd_get_power,
};
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;
/*
* 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");