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Commit fbd1b17b authored by Dmitry Eremin-Solenikov's avatar Dmitry Eremin-Solenikov Committed by Richard Purdie
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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: default avatarDmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
parent 6da0b38f

arch/arm/mach-pxa/include/mach/tosa.h

+3 −0
Original line number Diff line number Diff line
@@ -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_ */

drivers/video/backlight/Kconfig

+18 −0
Original line number Diff line number Diff line
@@ -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

drivers/video/backlight/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -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

drivers/video/backlight/tosa_bl.c

0 → 100644
+198 −0
Original line number Diff line number Diff line 
/*

 *  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");

drivers/video/backlight/tosa_lcd.c

0 → 100644
+280 −0
Original line number Diff line number Diff line 
/*

 *  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");