[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / video / backlight / corgi_lcd.c

/*
 *  LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
 *
 *  Copyright (c) 2004-2006 Richard Purdie
 *
 *  Based on Sharp's 2.4 Backlight Driver
 *
 *  Copyright (c) 2008 Marvell International Ltd.
 *  	Converted to SPI device based LCD/Backlight device driver
 *  	by Eric Miao <eric.miao@marvell.com>
 *
 *  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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/fb.h>
#include <linux/lcd.h>
#include <linux/spi/spi.h>
#include <linux/spi/corgi_lcd.h>
#include <linux/slab.h>
#include <asm/mach/sharpsl_param.h>

#define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)

/* Register Addresses */
#define RESCTL_ADRS     0x00
#define PHACTRL_ADRS    0x01
#define DUTYCTRL_ADRS   0x02
#define POWERREG0_ADRS  0x03
#define POWERREG1_ADRS  0x04
#define GPOR3_ADRS      0x05
#define PICTRL_ADRS     0x06
#define POLCTRL_ADRS    0x07

/* Register Bit Definitions */
#define RESCTL_QVGA     0x01
#define RESCTL_VGA      0x00

#define POWER1_VW_ON    0x01  /* VW Supply FET ON */
#define POWER1_GVSS_ON  0x02  /* GVSS(-8V) Power Supply ON */
#define POWER1_VDD_ON   0x04  /* VDD(8V),SVSS(-4V) Power Supply ON */

#define POWER1_VW_OFF   0x00  /* VW Supply FET OFF */
#define POWER1_GVSS_OFF 0x00  /* GVSS(-8V) Power Supply OFF */
#define POWER1_VDD_OFF  0x00  /* VDD(8V),SVSS(-4V) Power Supply OFF */

#define POWER0_COM_DCLK 0x01  /* COM Voltage DC Bias DAC Serial Data Clock */
#define POWER0_COM_DOUT 0x02  /* COM Voltage DC Bias DAC Serial Data Out */
#define POWER0_DAC_ON   0x04  /* DAC Power Supply ON */
#define POWER0_COM_ON   0x08  /* COM Power Supply ON */
#define POWER0_VCC5_ON  0x10  /* VCC5 Power Supply ON */

#define POWER0_DAC_OFF  0x00  /* DAC Power Supply OFF */
#define POWER0_COM_OFF  0x00  /* COM Power Supply OFF */
#define POWER0_VCC5_OFF 0x00  /* VCC5 Power Supply OFF */

#define PICTRL_INIT_STATE      0x01
#define PICTRL_INIOFF          0x02
#define PICTRL_POWER_DOWN      0x04
#define PICTRL_COM_SIGNAL_OFF  0x08
#define PICTRL_DAC_SIGNAL_OFF  0x10

#define POLCTRL_SYNC_POL_FALL  0x01
#define POLCTRL_EN_POL_FALL    0x02
#define POLCTRL_DATA_POL_FALL  0x04
#define POLCTRL_SYNC_ACT_H     0x08
#define POLCTRL_EN_ACT_L       0x10

#define POLCTRL_SYNC_POL_RISE  0x00
#define POLCTRL_EN_POL_RISE    0x00
#define POLCTRL_DATA_POL_RISE  0x00
#define POLCTRL_SYNC_ACT_L     0x00
#define POLCTRL_EN_ACT_H       0x00

#define PHACTRL_PHASE_MANUAL   0x01
#define DEFAULT_PHAD_QVGA     (9)
#define DEFAULT_COMADJ        (125)

struct corgi_lcd {
	struct spi_device	*spi_dev;
	struct lcd_device	*lcd_dev;
	struct backlight_device	*bl_dev;

	int	limit_mask;
	int	intensity;
	int	power;
	int	mode;
	char	buf[2];

	int	gpio_backlight_on;
	int	gpio_backlight_cont;
	int	gpio_backlight_cont_inverted;

	void (*kick_battery)(void);
};

static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);

static struct corgi_lcd *the_corgi_lcd;
static unsigned long corgibl_flags;
#define CORGIBL_SUSPENDED     0x01
#define CORGIBL_BATTLOW       0x02

/*
 * This is only a psuedo I2C interface. We can't use the standard kernel
 * routines as the interface is write only. We just assume the data is acked...
 */
static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
{
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
	udelay(10);
}

static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
{
	lcdtg_ssp_i2c_send(lcd, data);
	lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
	lcdtg_ssp_i2c_send(lcd, data);
}

static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
{
	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
	lcdtg_ssp_i2c_send(lcd, base);
}

static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
{
	lcdtg_ssp_i2c_send(lcd, base);
	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
}

static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
				uint8_t base, uint8_t data)
{
	int i;
	for (i = 0; i < 8; i++) {
		if (data & 0x80)
			lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
		else
			lcdtg_i2c_send_bit(lcd, base);
		data <<= 1;
	}
}

static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
{
	lcdtg_i2c_send_bit(lcd, base);
}

static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
				     uint8_t base_data, uint8_t data)
{
	/* Set Common Voltage to M62332FP via I2C */
	lcdtg_i2c_send_start(lcd, base_data);
	lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
	lcdtg_i2c_wait_ack(lcd, base_data);
	lcdtg_i2c_send_byte(lcd, base_data, 0x00);
	lcdtg_i2c_wait_ack(lcd, base_data);
	lcdtg_i2c_send_byte(lcd, base_data, data);
	lcdtg_i2c_wait_ack(lcd, base_data);
	lcdtg_i2c_send_stop(lcd, base_data);
}

static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
{
	struct spi_message msg;
	struct spi_transfer xfer = {
		.len		= 1,
		.cs_change	= 1,
		.tx_buf		= lcd->buf,
	};

	lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
	spi_message_init(&msg);
	spi_message_add_tail(&xfer, &msg);

	return spi_sync(lcd->spi_dev, &msg);
}

/* Set Phase Adjust */
static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
{
	int adj;

	switch(mode) {
	case CORGI_LCD_MODE_VGA:
		/* Setting for VGA */
		adj = sharpsl_param.phadadj;
		adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
				  PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
		break;
	case CORGI_LCD_MODE_QVGA:
	default:
		/* Setting for QVGA */
		adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
		break;
	}

	corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
}

static void corgi_lcd_power_on(struct corgi_lcd *lcd)
{
	int comadj;

	/* Initialize Internal Logic & Port */
	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
			PICTRL_POWER_DOWN | PICTRL_INIOFF |
			PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
			PICTRL_DAC_SIGNAL_OFF);

	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
			POWER0_COM_OFF | POWER0_VCC5_OFF);

	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);

	/* VDD(+8V), SVSS(-4V) ON */
	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
	mdelay(3);

	/* DAC ON */
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
			POWER0_COM_OFF | POWER0_VCC5_OFF);

	/* INIB = H, INI = L  */
	/* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
			PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);

	/* Set Common Voltage */
	comadj = sharpsl_param.comadj;
	if (comadj < 0)
		comadj = DEFAULT_COMADJ;

	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
				 POWER0_VCC5_OFF, comadj);

	/* VCC5 ON, DAC ON */
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
			POWER0_COM_OFF | POWER0_VCC5_ON);

	/* GVSS(-8V) ON, VDD ON */
	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
	mdelay(2);

	/* COM SIGNAL ON (PICTL[3] = L) */
	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);

	/* COM ON, DAC ON, VCC5_ON */
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
			POWER0_COM_ON | POWER0_VCC5_ON);

	/* VW ON, GVSS ON, VDD ON */
	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);

	/* Signals output enable */
	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);

	/* Set Phase Adjust */
	lcdtg_set_phadadj(lcd, lcd->mode);

	/* Initialize for Input Signals from ATI */
	corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
			POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
			POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
			POLCTRL_EN_ACT_H);
	udelay(1000);

	switch (lcd->mode) {
	case CORGI_LCD_MODE_VGA:
		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
		break;
	case CORGI_LCD_MODE_QVGA:
	default:
		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
		break;
	}
}

static void corgi_lcd_power_off(struct corgi_lcd *lcd)
{
	/* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
	msleep(34);

	/* (1)VW OFF */
	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);

	/* (2)COM OFF */
	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);

	/* (3)Set Common Voltage Bias 0V */
	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
			POWER0_VCC5_ON, 0);

	/* (4)GVSS OFF */
	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);

	/* (5)VCC5 OFF */
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);

	/* (6)Set PDWN, INIOFF, DACOFF */
	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
			PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
			PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);

	/* (7)DAC OFF */
	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
			POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);

	/* (8)VDD OFF */
	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
}

static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
	int mode = CORGI_LCD_MODE_QVGA;

	if (m->xres == 640 || m->xres == 480)
		mode = CORGI_LCD_MODE_VGA;

	if (lcd->mode == mode)
		return 0;

	lcdtg_set_phadadj(lcd, mode);

	switch (mode) {
	case CORGI_LCD_MODE_VGA:
		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
		break;
	case CORGI_LCD_MODE_QVGA:
	default:
		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
		break;
	}

	lcd->mode = mode;
	return 0;
}

static int corgi_lcd_set_power(struct lcd_device *ld, int power)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);

	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
		corgi_lcd_power_on(lcd);

	if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
		corgi_lcd_power_off(lcd);

	lcd->power = power;
	return 0;
}

static int corgi_lcd_get_power(struct lcd_device *ld)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);

	return lcd->power;
}

static struct lcd_ops corgi_lcd_ops = {
	.get_power	= corgi_lcd_get_power,
	.set_power	= corgi_lcd_set_power,
	.set_mode	= corgi_lcd_set_mode,
};

static int corgi_bl_get_intensity(struct backlight_device *bd)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);

	return lcd->intensity;
}

static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
{
	int cont;

	if (intensity > 0x10)
		intensity += 0x10;

	corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);

	/* Bit 5 via GPIO_BACKLIGHT_CONT */
	cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;

	if (gpio_is_valid(lcd->gpio_backlight_cont))
		gpio_set_value(lcd->gpio_backlight_cont, cont);

	if (gpio_is_valid(lcd->gpio_backlight_on))
		gpio_set_value(lcd->gpio_backlight_on, intensity);

	if (lcd->kick_battery)
		lcd->kick_battery();

	lcd->intensity = intensity;
	return 0;
}

static int corgi_bl_update_status(struct backlight_device *bd)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
	int intensity = bd->props.brightness;

	if (bd->props.power != FB_BLANK_UNBLANK)
		intensity = 0;

	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
		intensity = 0;

	if (corgibl_flags & CORGIBL_SUSPENDED)
		intensity = 0;

	if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
		intensity = lcd->limit_mask;

	return corgi_bl_set_intensity(lcd, intensity);
}

void corgi_lcd_limit_intensity(int limit)
{
	if (limit)
		corgibl_flags |= CORGIBL_BATTLOW;
	else
		corgibl_flags &= ~CORGIBL_BATTLOW;

	backlight_update_status(the_corgi_lcd->bl_dev);
}
EXPORT_SYMBOL(corgi_lcd_limit_intensity);

static const struct backlight_ops corgi_bl_ops = {
	.get_brightness	= corgi_bl_get_intensity,
	.update_status  = corgi_bl_update_status,
};

#ifdef CONFIG_PM
static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);

	corgibl_flags |= CORGIBL_SUSPENDED;
	corgi_bl_set_intensity(lcd, 0);
	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
	return 0;
}

static int corgi_lcd_resume(struct spi_device *spi)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);

	corgibl_flags &= ~CORGIBL_SUSPENDED;
	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
	backlight_update_status(lcd->bl_dev);
	return 0;
}
#else
#define corgi_lcd_suspend	NULL
#define corgi_lcd_resume	NULL
#endif

static int setup_gpio_backlight(struct corgi_lcd *lcd,
				struct corgi_lcd_platform_data *pdata)
{
	struct spi_device *spi = lcd->spi_dev;
	int err;

	lcd->gpio_backlight_on = -1;
	lcd->gpio_backlight_cont = -1;

	if (gpio_is_valid(pdata->gpio_backlight_on)) {
		err = gpio_request(pdata->gpio_backlight_on, "BL_ON");
		if (err) {
			dev_err(&spi->dev, "failed to request GPIO%d for "
				"backlight_on\n", pdata->gpio_backlight_on);
			return err;
		}

		lcd->gpio_backlight_on = pdata->gpio_backlight_on;
		gpio_direction_output(lcd->gpio_backlight_on, 0);
	}

	if (gpio_is_valid(pdata->gpio_backlight_cont)) {
		err = gpio_request(pdata->gpio_backlight_cont, "BL_CONT");
		if (err) {
			dev_err(&spi->dev, "failed to request GPIO%d for "
				"backlight_cont\n", pdata->gpio_backlight_cont);
			goto err_free_backlight_on;
		}

		lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;

		/* spitz and akita use both GPIOs for backlight, and
		 * have inverted polarity of GPIO_BACKLIGHT_CONT
		 */
		if (gpio_is_valid(lcd->gpio_backlight_on)) {
			lcd->gpio_backlight_cont_inverted = 1;
			gpio_direction_output(lcd->gpio_backlight_cont, 1);
		} else {
			lcd->gpio_backlight_cont_inverted = 0;
			gpio_direction_output(lcd->gpio_backlight_cont, 0);
		}
	}
	return 0;

err_free_backlight_on:
	if (gpio_is_valid(lcd->gpio_backlight_on))
		gpio_free(lcd->gpio_backlight_on);
	return err;
}

static int __devinit corgi_lcd_probe(struct spi_device *spi)
{
	struct backlight_properties props;
	struct corgi_lcd_platform_data *pdata = spi->dev.platform_data;
	struct corgi_lcd *lcd;
	int ret = 0;

	if (pdata == NULL) {
		dev_err(&spi->dev, "platform data not available\n");
		return -EINVAL;
	}

	lcd = kzalloc(sizeof(struct corgi_lcd), GFP_KERNEL);
	if (!lcd) {
		dev_err(&spi->dev, "failed to allocate memory\n");
		return -ENOMEM;
	}

	lcd->spi_dev = spi;

	lcd->lcd_dev = lcd_device_register("corgi_lcd", &spi->dev,
					lcd, &corgi_lcd_ops);
	if (IS_ERR(lcd->lcd_dev)) {
		ret = PTR_ERR(lcd->lcd_dev);
		goto err_free_lcd;
	}
	lcd->power = FB_BLANK_POWERDOWN;
	lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.max_brightness = pdata->max_intensity;
	lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev, lcd,
						&corgi_bl_ops, &props);
	if (IS_ERR(lcd->bl_dev)) {
		ret = PTR_ERR(lcd->bl_dev);
		goto err_unregister_lcd;
	}
	lcd->bl_dev->props.brightness = pdata->default_intensity;
	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;

	ret = setup_gpio_backlight(lcd, pdata);
	if (ret)
		goto err_unregister_bl;

	lcd->kick_battery = pdata->kick_battery;

	dev_set_drvdata(&spi->dev, lcd);
	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
	backlight_update_status(lcd->bl_dev);

	lcd->limit_mask = pdata->limit_mask;
	the_corgi_lcd = lcd;
	return 0;

err_unregister_bl:
	backlight_device_unregister(lcd->bl_dev);
err_unregister_lcd:
	lcd_device_unregister(lcd->lcd_dev);
err_free_lcd:
	kfree(lcd);
	return ret;
}

static int __devexit corgi_lcd_remove(struct spi_device *spi)
{
	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);

	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
	lcd->bl_dev->props.brightness = 0;
	backlight_update_status(lcd->bl_dev);
	backlight_device_unregister(lcd->bl_dev);

	if (gpio_is_valid(lcd->gpio_backlight_on))
		gpio_free(lcd->gpio_backlight_on);

	if (gpio_is_valid(lcd->gpio_backlight_cont))
		gpio_free(lcd->gpio_backlight_cont);

	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
	lcd_device_unregister(lcd->lcd_dev);
	kfree(lcd);

	return 0;
}

static struct spi_driver corgi_lcd_driver = {
	.driver		= {
		.name	= "corgi-lcd",
		.owner	= THIS_MODULE,
	},
	.probe		= corgi_lcd_probe,
	.remove		= __devexit_p(corgi_lcd_remove),
	.suspend	= corgi_lcd_suspend,
	.resume		= corgi_lcd_resume,
};

static int __init corgi_lcd_init(void)
{
	return spi_register_driver(&corgi_lcd_driver);
}
module_init(corgi_lcd_init);

static void __exit corgi_lcd_exit(void)
{
	spi_unregister_driver(&corgi_lcd_driver);
}
module_exit(corgi_lcd_exit);

MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:corgi-lcd");
Commit	Line	Data
b18250a8 EM	1	/*
	2	* LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
	3	*
	4	* Copyright (c) 2004-2006 Richard Purdie
	5	*
	6	* Based on Sharp's 2.4 Backlight Driver
	7	*
	8	* Copyright (c) 2008 Marvell International Ltd.
	9	* Converted to SPI device based LCD/Backlight device driver
	10	* by Eric Miao <eric.miao@marvell.com>
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/kernel.h>
	20	#include <linux/init.h>
	21	#include <linux/delay.h>
ff7a4c71	22	#include <linux/gpio.h>
b18250a8 EM	23	#include <linux/fb.h>
	24	#include <linux/lcd.h>
	25	#include <linux/spi/spi.h>
	26	#include <linux/spi/corgi_lcd.h>
5a0e3ad6	27	#include <linux/slab.h>
b18250a8 EM	28	#include <asm/mach/sharpsl_param.h>
	29
	30	#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
	31
	32	/* Register Addresses */
	33	#define RESCTL_ADRS 0x00
	34	#define PHACTRL_ADRS 0x01
	35	#define DUTYCTRL_ADRS 0x02
	36	#define POWERREG0_ADRS 0x03
	37	#define POWERREG1_ADRS 0x04
	38	#define GPOR3_ADRS 0x05
	39	#define PICTRL_ADRS 0x06
	40	#define POLCTRL_ADRS 0x07
	41
	42	/* Register Bit Definitions */
	43	#define RESCTL_QVGA 0x01
	44	#define RESCTL_VGA 0x00
	45
	46	#define POWER1_VW_ON 0x01 /* VW Supply FET ON */
	47	#define POWER1_GVSS_ON 0x02 /* GVSS(-8V) Power Supply ON */
	48	#define POWER1_VDD_ON 0x04 /* VDD(8V),SVSS(-4V) Power Supply ON */
	49
	50	#define POWER1_VW_OFF 0x00 /* VW Supply FET OFF */
	51	#define POWER1_GVSS_OFF 0x00 /* GVSS(-8V) Power Supply OFF */
	52	#define POWER1_VDD_OFF 0x00 /* VDD(8V),SVSS(-4V) Power Supply OFF */
	53
	54	#define POWER0_COM_DCLK 0x01 /* COM Voltage DC Bias DAC Serial Data Clock */
	55	#define POWER0_COM_DOUT 0x02 /* COM Voltage DC Bias DAC Serial Data Out */
	56	#define POWER0_DAC_ON 0x04 /* DAC Power Supply ON */
	57	#define POWER0_COM_ON 0x08 /* COM Power Supply ON */
	58	#define POWER0_VCC5_ON 0x10 /* VCC5 Power Supply ON */
	59
	60	#define POWER0_DAC_OFF 0x00 /* DAC Power Supply OFF */
	61	#define POWER0_COM_OFF 0x00 /* COM Power Supply OFF */
	62	#define POWER0_VCC5_OFF 0x00 /* VCC5 Power Supply OFF */
	63
	64	#define PICTRL_INIT_STATE 0x01
	65	#define PICTRL_INIOFF 0x02
	66	#define PICTRL_POWER_DOWN 0x04
	67	#define PICTRL_COM_SIGNAL_OFF 0x08
	68	#define PICTRL_DAC_SIGNAL_OFF 0x10
	69
	70	#define POLCTRL_SYNC_POL_FALL 0x01
	71	#define POLCTRL_EN_POL_FALL 0x02
	72	#define POLCTRL_DATA_POL_FALL 0x04
	73	#define POLCTRL_SYNC_ACT_H 0x08
	74	#define POLCTRL_EN_ACT_L 0x10
	75
	76	#define POLCTRL_SYNC_POL_RISE 0x00
	77	#define POLCTRL_EN_POL_RISE 0x00
	78	#define POLCTRL_DATA_POL_RISE 0x00
	79	#define POLCTRL_SYNC_ACT_L 0x00
	80	#define POLCTRL_EN_ACT_H 0x00
	81
	82	#define PHACTRL_PHASE_MANUAL 0x01
	83	#define DEFAULT_PHAD_QVGA (9)
	84	#define DEFAULT_COMADJ (125)
	85
	86	struct corgi_lcd {
	87	struct spi_device *spi_dev;
	88	struct lcd_device *lcd_dev;
	89	struct backlight_device *bl_dev;
	90
bfdcaa3b	91	int limit_mask;
b18250a8 EM	92	int intensity;
	93	int power;
	94	int mode;
	95	char buf[2];
	96
ff7a4c71 EM	97	int gpio_backlight_on;
	98	int gpio_backlight_cont;
	99	int gpio_backlight_cont_inverted;
	100
b18250a8 EM	101	void (*kick_battery)(void);
	102	};
	103
	104	static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
	105
bfdcaa3b EM	106	static struct corgi_lcd *the_corgi_lcd;
	107	static unsigned long corgibl_flags;
	108	#define CORGIBL_SUSPENDED 0x01
	109	#define CORGIBL_BATTLOW 0x02
	110
b18250a8 EM	111	/*
	112	* This is only a psuedo I2C interface. We can't use the standard kernel
	113	* routines as the interface is write only. We just assume the data is acked...
	114	*/
	115	static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
	116	{
	117	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
	118	udelay(10);
	119	}
	120
	121	static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
	122	{
	123	lcdtg_ssp_i2c_send(lcd, data);
	124	lcdtg_ssp_i2c_send(lcd, data \| POWER0_COM_DCLK);
	125	lcdtg_ssp_i2c_send(lcd, data);
	126	}
	127
	128	static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
	129	{
	130	lcdtg_ssp_i2c_send(lcd, base \| POWER0_COM_DCLK \| POWER0_COM_DOUT);
	131	lcdtg_ssp_i2c_send(lcd, base \| POWER0_COM_DCLK);
	132	lcdtg_ssp_i2c_send(lcd, base);
	133	}
	134
	135	static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
	136	{
	137	lcdtg_ssp_i2c_send(lcd, base);
	138	lcdtg_ssp_i2c_send(lcd, base \| POWER0_COM_DCLK);
	139	lcdtg_ssp_i2c_send(lcd, base \| POWER0_COM_DCLK \| POWER0_COM_DOUT);
	140	}
	141
	142	static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
	143	uint8_t base, uint8_t data)
	144	{
	145	int i;
	146	for (i = 0; i < 8; i++) {
	147	if (data & 0x80)
	148	lcdtg_i2c_send_bit(lcd, base \| POWER0_COM_DOUT);
	149	else
	150	lcdtg_i2c_send_bit(lcd, base);
	151	data <<= 1;
	152	}
	153	}
	154
	155	static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
	156	{
	157	lcdtg_i2c_send_bit(lcd, base);
	158	}
	159
	160	static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
	161	uint8_t base_data, uint8_t data)
	162	{
	163	/* Set Common Voltage to M62332FP via I2C */
	164	lcdtg_i2c_send_start(lcd, base_data);
	165	lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
	166	lcdtg_i2c_wait_ack(lcd, base_data);
	167	lcdtg_i2c_send_byte(lcd, base_data, 0x00);
	168	lcdtg_i2c_wait_ack(lcd, base_data);
	169	lcdtg_i2c_send_byte(lcd, base_data, data);
	170	lcdtg_i2c_wait_ack(lcd, base_data);
	171	lcdtg_i2c_send_stop(lcd, base_data);
	172	}
	173
	174	static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
175	{
176	struct spi_message msg;
177	struct spi_transfer xfer = {
178	.len = 1,
179	.cs_change = 1,
180	.tx_buf = lcd->buf,
181	};
182
183	lcd->buf[0] = ((adrs & 0x07) << 5) \| (data & 0x1f);
184	spi_message_init(&msg);
185	spi_message_add_tail(&xfer, &msg);
186
187	return spi_sync(lcd->spi_dev, &msg);
188	}
189
190	/* Set Phase Adjust */
191	static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
192	{
193	int adj;
194
195	switch(mode) {
196	case CORGI_LCD_MODE_VGA:
197	/* Setting for VGA */
198	adj = sharpsl_param.phadadj;
199	adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
200	PHACTRL_PHASE_MANUAL \| ((adj & 0xf) << 1);
201	break;
202	case CORGI_LCD_MODE_QVGA:
203	default:
204	/* Setting for QVGA */
205	adj = (DEFAULT_PHAD_QVGA << 1) \| PHACTRL_PHASE_MANUAL;
206	break;
207	}
208
209	corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
210	}
211
212	static void corgi_lcd_power_on(struct corgi_lcd *lcd)
213	{
214	int comadj;
215
216	/* Initialize Internal Logic & Port */
217	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
218	PICTRL_POWER_DOWN \| PICTRL_INIOFF \|
219	PICTRL_INIT_STATE \| PICTRL_COM_SIGNAL_OFF \|
220	PICTRL_DAC_SIGNAL_OFF);
221
222	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
223	POWER0_COM_DCLK \| POWER0_COM_DOUT \| POWER0_DAC_OFF \|
224	POWER0_COM_OFF \| POWER0_VCC5_OFF);
225
226	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
227	POWER1_VW_OFF \| POWER1_GVSS_OFF \| POWER1_VDD_OFF);
228
229	/* VDD(+8V), SVSS(-4V) ON */
230	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
231	POWER1_VW_OFF \| POWER1_GVSS_OFF \| POWER1_VDD_ON);
232	mdelay(3);
233
234	/* DAC ON */
235	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
236	POWER0_COM_DCLK \| POWER0_COM_DOUT \| POWER0_DAC_ON \|
237	POWER0_COM_OFF \| POWER0_VCC5_OFF);
238
239	/* INIB = H, INI = L */
240	/* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
241	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
242	PICTRL_INIT_STATE \| PICTRL_COM_SIGNAL_OFF);
243
244	/* Set Common Voltage */
245	comadj = sharpsl_param.comadj;
246	if (comadj < 0)
247	comadj = DEFAULT_COMADJ;
248
249	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON \| POWER0_COM_OFF \|
250	POWER0_VCC5_OFF, comadj);
251
252	/* VCC5 ON, DAC ON */
253	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
254	POWER0_COM_DCLK \| POWER0_COM_DOUT \| POWER0_DAC_ON \|
255	POWER0_COM_OFF \| POWER0_VCC5_ON);
256
257	/* GVSS(-8V) ON, VDD ON */
258	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
259	POWER1_VW_OFF \| POWER1_GVSS_ON \| POWER1_VDD_ON);
260	mdelay(2);
261
262	/* COM SIGNAL ON (PICTL[3] = L) */
263	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
264
265	/* COM ON, DAC ON, VCC5_ON */
266	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
267	POWER0_COM_DCLK \| POWER0_COM_DOUT \| POWER0_DAC_ON \|
268	POWER0_COM_ON \| POWER0_VCC5_ON);
269
270	/* VW ON, GVSS ON, VDD ON */
271	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
272	POWER1_VW_ON \| POWER1_GVSS_ON \| POWER1_VDD_ON);
273
274	/* Signals output enable */
275	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
276
277	/* Set Phase Adjust */
278	lcdtg_set_phadadj(lcd, lcd->mode);
279
280	/* Initialize for Input Signals from ATI */
281	corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
282	POLCTRL_SYNC_POL_RISE \| POLCTRL_EN_POL_RISE \|
283	POLCTRL_DATA_POL_RISE \| POLCTRL_SYNC_ACT_L \|
284	POLCTRL_EN_ACT_H);
285	udelay(1000);
286
287	switch (lcd->mode) {
288	case CORGI_LCD_MODE_VGA:
289	corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
290	break;
291	case CORGI_LCD_MODE_QVGA:
292	default:
293	corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
294	break;
295	}
296	}
297
298	static void corgi_lcd_power_off(struct corgi_lcd *lcd)
299	{
300	/* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
301	msleep(34);
302
303	/* (1)VW OFF */
304	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
305	POWER1_VW_OFF \| POWER1_GVSS_ON \| POWER1_VDD_ON);
306
307	/* (2)COM OFF */
308	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
309	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
310	POWER0_DAC_ON \| POWER0_COM_OFF \| POWER0_VCC5_ON);
311
312	/* (3)Set Common Voltage Bias 0V */
313	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON \| POWER0_COM_OFF \|
314	POWER0_VCC5_ON, 0);
315
316	/* (4)GVSS OFF */
317	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
318	POWER1_VW_OFF \| POWER1_GVSS_OFF \| POWER1_VDD_ON);
319
320	/* (5)VCC5 OFF */
321	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
322	POWER0_DAC_ON \| POWER0_COM_OFF \| POWER0_VCC5_OFF);
323
324	/* (6)Set PDWN, INIOFF, DACOFF */
325	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
326	PICTRL_INIOFF \| PICTRL_DAC_SIGNAL_OFF \|
327	PICTRL_POWER_DOWN \| PICTRL_COM_SIGNAL_OFF);
328
329	/* (7)DAC OFF */
330	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
331	POWER0_DAC_OFF \| POWER0_COM_OFF \| POWER0_VCC5_OFF);
332
333	/* (8)VDD OFF */
334	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
335	POWER1_VW_OFF \| POWER1_GVSS_OFF \| POWER1_VDD_OFF);
336	}
337
338	static int corgi_lcd_set_mode(struct lcd_device ld, struct fb_videomode m)
339	{
340	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
341	int mode = CORGI_LCD_MODE_QVGA;
342
343	if (m->xres == 640 \|\| m->xres == 480)
344	mode = CORGI_LCD_MODE_VGA;
345
346	if (lcd->mode == mode)
347	return 0;
348
349	lcdtg_set_phadadj(lcd, mode);
350
351	switch (mode) {
352	case CORGI_LCD_MODE_VGA:
353	corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
354	break;
355	case CORGI_LCD_MODE_QVGA:
356	default:
357	corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
358	break;
359	}
360
361	lcd->mode = mode;
362	return 0;
363	}
364
365	static int corgi_lcd_set_power(struct lcd_device *ld, int power)
366	{
367	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
368
369	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
370	corgi_lcd_power_on(lcd);
371
372	if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
373	corgi_lcd_power_off(lcd);
374
375	lcd->power = power;
376	return 0;
377	}
378
379	static int corgi_lcd_get_power(struct lcd_device *ld)
380	{
381	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
382
383	return lcd->power;
384	}
385
386	static struct lcd_ops corgi_lcd_ops = {
387	.get_power = corgi_lcd_get_power,
388	.set_power = corgi_lcd_set_power,
389	.set_mode = corgi_lcd_set_mode,
390	};
391
392	static int corgi_bl_get_intensity(struct backlight_device *bd)
393	{
394	struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
395
396	return lcd->intensity;
397	}
398
399	static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
400	{
ff7a4c71 EM	401	int cont;
ff7a4c71 EM	402
b18250a8 EM	403	if (intensity > 0x10)
	404	intensity += 0x10;
	405
	406	corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
b18250a8	407
ff7a4c71 EM	408	/* Bit 5 via GPIO_BACKLIGHT_CONT */
	409	cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
	410
	411	if (gpio_is_valid(lcd->gpio_backlight_cont))
	412	gpio_set_value(lcd->gpio_backlight_cont, cont);
	413
	414	if (gpio_is_valid(lcd->gpio_backlight_on))
	415	gpio_set_value(lcd->gpio_backlight_on, intensity);
b18250a8 EM	416
	417	if (lcd->kick_battery)
	418	lcd->kick_battery();
	419
ff7a4c71	420	lcd->intensity = intensity;
b18250a8 EM	421	return 0;
	422	}
	423
	424	static int corgi_bl_update_status(struct backlight_device *bd)
	425	{
	426	struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
	427	int intensity = bd->props.brightness;
	428
	429	if (bd->props.power != FB_BLANK_UNBLANK)
	430	intensity = 0;
	431
	432	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
	433	intensity = 0;
	434
bfdcaa3b EM	435	if (corgibl_flags & CORGIBL_SUSPENDED)
bfdcaa3b EM	436	intensity = 0;
716bdf18 PM	437
	438	if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
	439	intensity = lcd->limit_mask;
bfdcaa3b	440
b18250a8 EM	441	return corgi_bl_set_intensity(lcd, intensity);
	442	}
	443
5cbff960	444	void corgi_lcd_limit_intensity(int limit)
bfdcaa3b EM	445	{
	446	if (limit)
	447	corgibl_flags \|= CORGIBL_BATTLOW;
	448	else
	449	corgibl_flags &= ~CORGIBL_BATTLOW;
	450
	451	backlight_update_status(the_corgi_lcd->bl_dev);
	452	}
5cbff960	453	EXPORT_SYMBOL(corgi_lcd_limit_intensity);
bfdcaa3b	454
9905a43b	455	static const struct backlight_ops corgi_bl_ops = {
b18250a8 EM	456	.get_brightness = corgi_bl_get_intensity,
	457	.update_status = corgi_bl_update_status,
	458	};
	459
	460	#ifdef CONFIG_PM
	461	static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state)
	462	{
	463	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
	464
bfdcaa3b	465	corgibl_flags \|= CORGIBL_SUSPENDED;
b18250a8 EM	466	corgi_bl_set_intensity(lcd, 0);
	467	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
	468	return 0;
	469	}
	470
	471	static int corgi_lcd_resume(struct spi_device *spi)
	472	{
	473	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
	474
bfdcaa3b	475	corgibl_flags &= ~CORGIBL_SUSPENDED;
b18250a8 EM	476	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
	477	backlight_update_status(lcd->bl_dev);
	478	return 0;
	479	}
	480	#else
	481	#define corgi_lcd_suspend NULL
	482	#define corgi_lcd_resume NULL
	483	#endif
	484
ff7a4c71 EM	485	static int setup_gpio_backlight(struct corgi_lcd *lcd,
	486	struct corgi_lcd_platform_data *pdata)
	487	{
	488	struct spi_device *spi = lcd->spi_dev;
	489	int err;
	490
	491	lcd->gpio_backlight_on = -1;
	492	lcd->gpio_backlight_cont = -1;
	493
	494	if (gpio_is_valid(pdata->gpio_backlight_on)) {
	495	err = gpio_request(pdata->gpio_backlight_on, "BL_ON");
	496	if (err) {
	497	dev_err(&spi->dev, "failed to request GPIO%d for "
	498	"backlight_on\n", pdata->gpio_backlight_on);
	499	return err;
	500	}
	501
	502	lcd->gpio_backlight_on = pdata->gpio_backlight_on;
	503	gpio_direction_output(lcd->gpio_backlight_on, 0);
	504	}
	505
	506	if (gpio_is_valid(pdata->gpio_backlight_cont)) {
	507	err = gpio_request(pdata->gpio_backlight_cont, "BL_CONT");
	508	if (err) {
	509	dev_err(&spi->dev, "failed to request GPIO%d for "
	510	"backlight_cont\n", pdata->gpio_backlight_cont);
	511	goto err_free_backlight_on;
	512	}
	513
	514	lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;
	515
	516	/* spitz and akita use both GPIOs for backlight, and
	517	* have inverted polarity of GPIO_BACKLIGHT_CONT
	518	*/
	519	if (gpio_is_valid(lcd->gpio_backlight_on)) {
	520	lcd->gpio_backlight_cont_inverted = 1;
	521	gpio_direction_output(lcd->gpio_backlight_cont, 1);
	522	} else {
	523	lcd->gpio_backlight_cont_inverted = 0;
	524	gpio_direction_output(lcd->gpio_backlight_cont, 0);
	525	}
	526	}
	527	return 0;
	528
	529	err_free_backlight_on:
	530	if (gpio_is_valid(lcd->gpio_backlight_on))
	531	gpio_free(lcd->gpio_backlight_on);
	532	return err;
	533	}
	534
b18250a8 EM	535	static int __devinit corgi_lcd_probe(struct spi_device *spi)
b18250a8 EM	536	{
a19a6ee6	537	struct backlight_properties props;
b18250a8 EM	538	struct corgi_lcd_platform_data *pdata = spi->dev.platform_data;
	539	struct corgi_lcd *lcd;
	540	int ret = 0;
	541
	542	if (pdata == NULL) {
	543	dev_err(&spi->dev, "platform data not available\n");
	544	return -EINVAL;
	545	}
	546
	547	lcd = kzalloc(sizeof(struct corgi_lcd), GFP_KERNEL);
	548	if (!lcd) {
	549	dev_err(&spi->dev, "failed to allocate memory\n");
	550	return -ENOMEM;
	551	}
	552
	553	lcd->spi_dev = spi;
	554
	555	lcd->lcd_dev = lcd_device_register("corgi_lcd", &spi->dev,
	556	lcd, &corgi_lcd_ops);
	557	if (IS_ERR(lcd->lcd_dev)) {
	558	ret = PTR_ERR(lcd->lcd_dev);
	559	goto err_free_lcd;
	560	}
	561	lcd->power = FB_BLANK_POWERDOWN;
	562	lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
	563
a19a6ee6 MG	564	memset(&props, 0, sizeof(struct backlight_properties));
	565	props.max_brightness = pdata->max_intensity;
	566	lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev, lcd,
	567	&corgi_bl_ops, &props);
b18250a8 EM	568	if (IS_ERR(lcd->bl_dev)) {
	569	ret = PTR_ERR(lcd->bl_dev);
	570	goto err_unregister_lcd;
	571	}
b18250a8 EM	572	lcd->bl_dev->props.brightness = pdata->default_intensity;
	573	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
	574
ff7a4c71 EM	575	ret = setup_gpio_backlight(lcd, pdata);
	576	if (ret)
	577	goto err_unregister_bl;
	578
b18250a8 EM	579	lcd->kick_battery = pdata->kick_battery;
	580
	581	dev_set_drvdata(&spi->dev, lcd);
	582	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
	583	backlight_update_status(lcd->bl_dev);
bfdcaa3b EM	584
	585	lcd->limit_mask = pdata->limit_mask;
	586	the_corgi_lcd = lcd;
b18250a8 EM	587	return 0;
b18250a8 EM	588
ff7a4c71 EM	589	err_unregister_bl:
ff7a4c71 EM	590	backlight_device_unregister(lcd->bl_dev);
b18250a8 EM	591	err_unregister_lcd:
	592	lcd_device_unregister(lcd->lcd_dev);
	593	err_free_lcd:
	594	kfree(lcd);
	595	return ret;
	596	}
	597
	598	static int __devexit corgi_lcd_remove(struct spi_device *spi)
	599	{
	600	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
	601
	602	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
	603	lcd->bl_dev->props.brightness = 0;
	604	backlight_update_status(lcd->bl_dev);
	605	backlight_device_unregister(lcd->bl_dev);
	606
ff7a4c71 EM	607	if (gpio_is_valid(lcd->gpio_backlight_on))
	608	gpio_free(lcd->gpio_backlight_on);
	609
	610	if (gpio_is_valid(lcd->gpio_backlight_cont))
	611	gpio_free(lcd->gpio_backlight_cont);
	612
b18250a8 EM	613	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
	614	lcd_device_unregister(lcd->lcd_dev);
	615	kfree(lcd);
	616
	617	return 0;
	618	}
	619
	620	static struct spi_driver corgi_lcd_driver = {
	621	.driver = {
	622	.name = "corgi-lcd",
	623	.owner = THIS_MODULE,
	624	},
	625	.probe = corgi_lcd_probe,
	626	.remove = __devexit_p(corgi_lcd_remove),
	627	.suspend = corgi_lcd_suspend,
	628	.resume = corgi_lcd_resume,
	629	};
	630
	631	static int __init corgi_lcd_init(void)
	632	{
	633	return spi_register_driver(&corgi_lcd_driver);
	634	}
	635	module_init(corgi_lcd_init);
	636
	637	static void __exit corgi_lcd_exit(void)
	638	{
	639	spi_unregister_driver(&corgi_lcd_driver);
	640	}
	641	module_exit(corgi_lcd_exit);
	642
	643	MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
	644	MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
	645	MODULE_LICENSE("GPL");
e0626e38	646	MODULE_ALIAS("spi:corgi-lcd");