[linux-block.git] / drivers / video / backlight / jornada720_lcd.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * LCD driver for HP Jornada 700 series (710/720/728)
 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
 */

#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
7de31d0d	1	// SPDX-License-Identifier: GPL-2.0-or-later
9e124435 KE	2	/*
	3	*
	4	* LCD driver for HP Jornada 700 series (710/720/728)
	5	* Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
9e124435 KE	6	*/
	7
	8	#include <linux/device.h>
	9	#include <linux/fb.h>
	10	#include <linux/kernel.h>
	11	#include <linux/lcd.h>
	12	#include <linux/module.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/delay.h>
	15
	16	#include <mach/jornada720.h>
	17	#include <mach/hardware.h>
	18
	19	#include <video/s1d13xxxfb.h>
	20
	21	#define LCD_MAX_CONTRAST 0xff
	22	#define LCD_DEF_CONTRAST 0x80
	23
b2dcd7be	24	static int jornada_lcd_get_power(struct lcd_device *ld)
9e124435	25	{
3e51cd93	26	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
9e124435 KE	27	}
9e124435 KE	28
b2dcd7be	29	static int jornada_lcd_get_contrast(struct lcd_device *ld)
9e124435 KE	30	{
	31	int ret;
	32
b2dcd7be	33	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
9e124435 KE	34	return 0;
	35
	36	jornada_ssp_start();
	37
1e3b0970	38	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
9e124435	39	ret = jornada_ssp_byte(TXDUMMY);
1e3b0970	40	goto success;
9e124435	41	}
1e3b0970 LJ	42
	43	dev_err(&ld->dev, "failed to set contrast\n");
	44	ret = -ETIMEDOUT;
	45
	46	success:
	47	jornada_ssp_end();
	48	return ret;
9e124435 KE	49	}
9e124435 KE	50
b2dcd7be	51	static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
9e124435	52	{
1e3b0970	53	int ret = 0;
9e124435 KE	54
	55	jornada_ssp_start();
	56
	57	/* start by sending our set contrast cmd to mcu */
1e3b0970 LJ	58	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
	59	/* if successful push the new value */
	60	if (jornada_ssp_byte(value) == TXDUMMY)
	61	goto success;
9e124435 KE	62	}
9e124435 KE	63
1e3b0970 LJ	64	dev_err(&ld->dev, "failed to set contrast\n");
1e3b0970 LJ	65	ret = -ETIMEDOUT;
9e124435	66
1e3b0970 LJ	67	success:
	68	jornada_ssp_end();
	69	return ret;
9e124435 KE	70	}
9e124435 KE	71
b2dcd7be	72	static int jornada_lcd_set_power(struct lcd_device *ld, int power)
9e124435 KE	73	{
	74	if (power != FB_BLANK_UNBLANK) {
	75	PPSR &= ~PPC_LDD2;
	76	PPDR \|= PPC_LDD2;
b2dcd7be	77	} else {
9e124435	78	PPSR \|= PPC_LDD2;
b2dcd7be	79	}
9e124435 KE	80
	81	return 0;
	82	}
	83
	84	static struct lcd_ops jornada_lcd_props = {
	85	.get_contrast = jornada_lcd_get_contrast,
	86	.set_contrast = jornada_lcd_set_contrast,
	87	.get_power = jornada_lcd_get_power,
	88	.set_power = jornada_lcd_set_power,
	89	};
	90
	91	static int jornada_lcd_probe(struct platform_device *pdev)
	92	{
	93	struct lcd_device *lcd_device;
	94	int ret;
	95
964598f2 JH	96	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
964598f2 JH	97	&pdev->dev, NULL, &jornada_lcd_props);
9e124435 KE	98
	99	if (IS_ERR(lcd_device)) {
	100	ret = PTR_ERR(lcd_device);
b2dcd7be	101	dev_err(&pdev->dev, "failed to register device\n");
9e124435 KE	102	return ret;
	103	}
	104
	105	platform_set_drvdata(pdev, lcd_device);
	106
	107	/* lets set our default values */
	108	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
	109	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
	110	/* give it some time to startup */
	111	msleep(100);
	112
	113	return 0;
	114	}
	115
9e124435 KE	116	static struct platform_driver jornada_lcd_driver = {
9e124435 KE	117	.probe = jornada_lcd_probe,
9e124435 KE	118	.driver = {
	119	.name = "jornada_lcd",
	120	},
	121	};
	122
81178e02	123	module_platform_driver(jornada_lcd_driver);
9e124435 KE	124
	125	MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
	126	MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
	127	MODULE_LICENSE("GPL");