[deliverable/linux.git] / drivers / video / backlight / jornada720_lcd.c

/*
 *
 * LCD driver for HP Jornada 700 series (710/720/728)
 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.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 or any later version as published by the Free Software Foundation.
 *
 */

#include <linux/device.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>

#include <mach/jornada720.h>
#include <mach/hardware.h>

#include <video/s1d13xxxfb.h>

#define LCD_MAX_CONTRAST	0xff
#define LCD_DEF_CONTRAST	0x80

static int jornada_lcd_get_power(struct lcd_device *ld)
{
	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
}

static int jornada_lcd_get_contrast(struct lcd_device *ld)
{
	int ret;

	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
		return 0;

	jornada_ssp_start();

	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
		ret = jornada_ssp_byte(TXDUMMY);
		goto success;
	}

	dev_err(&ld->dev, "failed to set contrast\n");
	ret = -ETIMEDOUT;

success:
	jornada_ssp_end();
	return ret;
}

static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
{
	int ret = 0;

	jornada_ssp_start();

	/* start by sending our set contrast cmd to mcu */
	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
		/* if successful push the new value */
		if (jornada_ssp_byte(value) == TXDUMMY)
			goto success;
	}

	dev_err(&ld->dev, "failed to set contrast\n");
	ret = -ETIMEDOUT;

success:
	jornada_ssp_end();
	return ret;
}

static int jornada_lcd_set_power(struct lcd_device *ld, int power)
{
	if (power != FB_BLANK_UNBLANK) {
		PPSR &= ~PPC_LDD2;
		PPDR |= PPC_LDD2;
	} else {
		PPSR |= PPC_LDD2;
	}

	return 0;
}

static struct lcd_ops jornada_lcd_props = {
	.get_contrast = jornada_lcd_get_contrast,
	.set_contrast = jornada_lcd_set_contrast,
	.get_power = jornada_lcd_get_power,
	.set_power = jornada_lcd_set_power,
};

static int jornada_lcd_probe(struct platform_device *pdev)
{
	struct lcd_device *lcd_device;
	int ret;

	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
					&pdev->dev, NULL, &jornada_lcd_props);

	if (IS_ERR(lcd_device)) {
		ret = PTR_ERR(lcd_device);
		dev_err(&pdev->dev, "failed to register device\n");
		return ret;
	}

	platform_set_drvdata(pdev, lcd_device);

	/* lets set our default values */
	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
	/* give it some time to startup */
	msleep(100);

	return 0;
}

static struct platform_driver jornada_lcd_driver = {
	.probe	= jornada_lcd_probe,
	.driver	= {
		.name	= "jornada_lcd",
	},
};

module_platform_driver(jornada_lcd_driver);

MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9e124435 KE	1	/*
	2	*
	3	* LCD driver for HP Jornada 700 series (710/720/728)
	4	* Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version
	8	* 2 or any later version as published by the Free Software Foundation.
	9	*
	10	*/
	11
	12	#include <linux/device.h>
	13	#include <linux/fb.h>
	14	#include <linux/kernel.h>
	15	#include <linux/lcd.h>
	16	#include <linux/module.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/delay.h>
	19
	20	#include <mach/jornada720.h>
	21	#include <mach/hardware.h>
	22
	23	#include <video/s1d13xxxfb.h>
	24
	25	#define LCD_MAX_CONTRAST 0xff
	26	#define LCD_DEF_CONTRAST 0x80
	27
b2dcd7be	28	static int jornada_lcd_get_power(struct lcd_device *ld)
9e124435	29	{
3e51cd93	30	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
9e124435 KE	31	}
9e124435 KE	32
b2dcd7be	33	static int jornada_lcd_get_contrast(struct lcd_device *ld)
9e124435 KE	34	{
	35	int ret;
	36
b2dcd7be	37	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
9e124435 KE	38	return 0;
	39
	40	jornada_ssp_start();
	41
1e3b0970	42	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
9e124435	43	ret = jornada_ssp_byte(TXDUMMY);
1e3b0970	44	goto success;
9e124435	45	}
1e3b0970 LJ	46
	47	dev_err(&ld->dev, "failed to set contrast\n");
	48	ret = -ETIMEDOUT;
	49
	50	success:
	51	jornada_ssp_end();
	52	return ret;
9e124435 KE	53	}
9e124435 KE	54
b2dcd7be	55	static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
9e124435	56	{
1e3b0970	57	int ret = 0;
9e124435 KE	58
	59	jornada_ssp_start();
	60
	61	/* start by sending our set contrast cmd to mcu */
1e3b0970 LJ	62	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
	63	/* if successful push the new value */
	64	if (jornada_ssp_byte(value) == TXDUMMY)
	65	goto success;
9e124435 KE	66	}
9e124435 KE	67
1e3b0970 LJ	68	dev_err(&ld->dev, "failed to set contrast\n");
1e3b0970 LJ	69	ret = -ETIMEDOUT;
9e124435	70
1e3b0970 LJ	71	success:
	72	jornada_ssp_end();
	73	return ret;
9e124435 KE	74	}
9e124435 KE	75
b2dcd7be	76	static int jornada_lcd_set_power(struct lcd_device *ld, int power)
9e124435 KE	77	{
	78	if (power != FB_BLANK_UNBLANK) {
	79	PPSR &= ~PPC_LDD2;
	80	PPDR \|= PPC_LDD2;
b2dcd7be	81	} else {
9e124435	82	PPSR \|= PPC_LDD2;
b2dcd7be	83	}
9e124435 KE	84
	85	return 0;
	86	}
	87
	88	static struct lcd_ops jornada_lcd_props = {
	89	.get_contrast = jornada_lcd_get_contrast,
	90	.set_contrast = jornada_lcd_set_contrast,
	91	.get_power = jornada_lcd_get_power,
	92	.set_power = jornada_lcd_set_power,
	93	};
	94
	95	static int jornada_lcd_probe(struct platform_device *pdev)
	96	{
	97	struct lcd_device *lcd_device;
	98	int ret;
	99
964598f2 JH	100	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
964598f2 JH	101	&pdev->dev, NULL, &jornada_lcd_props);
9e124435 KE	102
	103	if (IS_ERR(lcd_device)) {
	104	ret = PTR_ERR(lcd_device);
b2dcd7be	105	dev_err(&pdev->dev, "failed to register device\n");
9e124435 KE	106	return ret;
	107	}
	108
	109	platform_set_drvdata(pdev, lcd_device);
	110
	111	/* lets set our default values */
	112	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
	113	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
	114	/* give it some time to startup */
	115	msleep(100);
	116
	117	return 0;
	118	}
	119
9e124435 KE	120	static struct platform_driver jornada_lcd_driver = {
9e124435 KE	121	.probe = jornada_lcd_probe,
9e124435 KE	122	.driver = {
	123	.name = "jornada_lcd",
	124	},
	125	};
	126
81178e02	127	module_platform_driver(jornada_lcd_driver);
9e124435 KE	128
	129	MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
	130	MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
	131	MODULE_LICENSE("GPL");