Commit b18250a8 authored by Eric Miao's avatar Eric Miao Committed by Russell King
Browse files

lcd: add SPI-based LCD and backlight driver for SHARP corgi/spitz 



The driver is based on different source files including corgi_ssp.c,
corgi_lcd.c and corgi_bl.c, previously authored by Richard Purdie
and many others.

The LCD and Backlight device actually share the same SPI device, so
they are made into this single driver.

Signed-off-by: default avatarEric Miao <eric.miao@marvell.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent faa312da

drivers/video/backlight/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -24,6 +24,13 @@ config LCD_CLASS_DEVICE 
	  To have support for your specific LCD panel you will have to

	  select the proper drivers which depend on this option.



config LCD_CORGI

	tristate "LCD Panel support for SHARP corgi/spitz model"

	depends on LCD_CLASS_DEVICE && SPI_MASTER && PXA_SHARPSL

	help

	  Say y here to support the LCD panels usually found on SHARP

	  corgi (C7x0) and spitz (Cxx00) models.



config LCD_LTV350QV

	tristate "Samsung LTV350QV LCD Panel"

	depends on LCD_CLASS_DEVICE && SPI_MASTER

drivers/video/backlight/Makefile

+1 −0
Original line number Diff line number Diff line 
# Backlight & LCD drivers



obj-$(CONFIG_LCD_CLASS_DEVICE)     += lcd.o

obj-$(CONFIG_LCD_CORGI)		   += corgi_lcd.o

obj-$(CONFIG_LCD_LTV350QV)	   += ltv350qv.o

obj-$(CONFIG_LCD_ILI9320)	   += ili9320.o

obj-$(CONFIG_LCD_PLATFORM)	   += platform_lcd.o

drivers/video/backlight/corgi_lcd.c

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/*

 *  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/fb.h>

#include <linux/lcd.h>

#include <linux/spi/spi.h>

#include <linux/spi/corgi_lcd.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	intensity;

	int	power;

	int	mode;

	char	buf[2];



	void (*notify)(int intensity);

	void (*kick_battery)(void);

};



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



/*

 * 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)

{

	if (intensity > 0x10)

		intensity += 0x10;



	corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);

	lcd->intensity = intensity;



	if (lcd->notify)

		lcd->notify(intensity);



	if (lcd->kick_battery)

		lcd->kick_battery();



	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;



	return corgi_bl_set_intensity(lcd, intensity);

}



static 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);



	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);



	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 __devinit corgi_lcd_probe(struct spi_device *spi)

{

	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;



	lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev,

					lcd, &corgi_bl_ops);

	if (IS_ERR(lcd->bl_dev)) {

		ret = PTR_ERR(lcd->bl_dev);

		goto err_unregister_lcd;

	}

	lcd->bl_dev->props.max_brightness = pdata->max_intensity;

	lcd->bl_dev->props.brightness = pdata->default_intensity;

	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;



	lcd->notify = pdata->notify;

	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);

	return 0;



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);



	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");

include/linux/spi/corgi_lcd.h

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#ifndef __LINUX_SPI_CORGI_LCD_H

#define __LINUX_SPI_CORGI_LCD_H



#define CORGI_LCD_MODE_QVGA	1

#define CORGI_LCD_MODE_VGA	2



struct corgi_lcd_platform_data {

	int	init_mode;

	int	max_intensity;

	int	default_intensity;



	void (*notify)(int intensity);

	void (*kick_battery)(void);

};



#endif /* __LINUX_SPI_CORGI_LCD_H */

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