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

/*
 *  Backlight Driver for Frontpath ProGear HX1050+
 *
 *  Copyright (c) 2006 Marcin Juszkiewicz
 *
 *  Based on Progear LCD driver by M Schacht
 *  <mschacht at alumni dot washington dot edu>
 *
 *  Based on Sharp's Corgi Backlight Driver
 *  Based on Backlight Driver for HP Jornada 680
 *
 *  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.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/pci.h>

#define PMU_LPCR               0xB0
#define SB_MPS1                0x61
#define HW_LEVEL_MAX           0x77
#define HW_LEVEL_MIN           0x4f

static struct pci_dev *pmu_dev = NULL;
static struct pci_dev *sb_dev = NULL;

static int progearbl_set_intensity(struct backlight_device *bd)
{
	int intensity = bd->props.brightness;

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

	pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN);

	return 0;
}

static int progearbl_get_intensity(struct backlight_device *bd)
{
	u8 intensity;
	pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity);

	return intensity - HW_LEVEL_MIN;
}

static const struct backlight_ops progearbl_ops = {
	.get_brightness = progearbl_get_intensity,
	.update_status = progearbl_set_intensity,
};

static int progearbl_probe(struct platform_device *pdev)
{
	struct backlight_properties props;
	u8 temp;
	struct backlight_device *progear_backlight_device;
	int ret;

	pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
	if (!pmu_dev) {
		pr_err("ALI M7101 PMU not found.\n");
		return -ENODEV;
	}

	sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
	if (!sb_dev) {
		pr_err("ALI 1533 SB not found.\n");
		ret = -ENODEV;
		goto put_pmu;
	}

	/*     Set SB_MPS1 to enable brightness control. */
	pci_read_config_byte(sb_dev, SB_MPS1, &temp);
	pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20);

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
	progear_backlight_device = backlight_device_register("progear-bl",
							     &pdev->dev, NULL,
							     &progearbl_ops,
							     &props);
	if (IS_ERR(progear_backlight_device)) {
		ret = PTR_ERR(progear_backlight_device);
		goto put_sb;
	}

	platform_set_drvdata(pdev, progear_backlight_device);

	progear_backlight_device->props.power = FB_BLANK_UNBLANK;
	progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
	progearbl_set_intensity(progear_backlight_device);

	return 0;
put_sb:
	pci_dev_put(sb_dev);
put_pmu:
	pci_dev_put(pmu_dev);
	return ret;
}

static int progearbl_remove(struct platform_device *pdev)
{
	struct backlight_device *bd = platform_get_drvdata(pdev);
	backlight_device_unregister(bd);

	return 0;
}

static struct platform_driver progearbl_driver = {
	.probe = progearbl_probe,
	.remove = progearbl_remove,
	.driver = {
		   .name = "progear-bl",
		   },
};

static struct platform_device *progearbl_device;

static int __init progearbl_init(void)
{
	int ret = platform_driver_register(&progearbl_driver);

	if (ret)
		return ret;
	progearbl_device = platform_device_register_simple("progear-bl", -1,
								NULL, 0);
	if (IS_ERR(progearbl_device)) {
		platform_driver_unregister(&progearbl_driver);
		return PTR_ERR(progearbl_device);
	}

	return 0;
}

static void __exit progearbl_exit(void)
{
	pci_dev_put(pmu_dev);
	pci_dev_put(sb_dev);

	platform_device_unregister(progearbl_device);
	platform_driver_unregister(&progearbl_driver);
}

module_init(progearbl_init);
module_exit(progearbl_exit);

MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
MODULE_DESCRIPTION("ProGear Backlight Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
7a208463 MJ	1	/*
	2	* Backlight Driver for Frontpath ProGear HX1050+
	3	*
	4	* Copyright (c) 2006 Marcin Juszkiewicz
	5	*
	6	* Based on Progear LCD driver by M Schacht
	7	* <mschacht at alumni dot washington dot edu>
	8	*
	9	* Based on Sharp's Corgi Backlight Driver
	10	* Based on Backlight Driver for HP Jornada 680
	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
c3539731 JH	18	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
c3539731 JH	19
7a208463 MJ	20	#include <linux/module.h>
	21	#include <linux/kernel.h>
	22	#include <linux/init.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/mutex.h>
	25	#include <linux/fb.h>
	26	#include <linux/backlight.h>
	27	#include <linux/pci.h>
7a208463 MJ	28
	29	#define PMU_LPCR 0xB0
	30	#define SB_MPS1 0x61
	31	#define HW_LEVEL_MAX 0x77
	32	#define HW_LEVEL_MIN 0x4f
	33
	34	static struct pci_dev *pmu_dev = NULL;
	35	static struct pci_dev *sb_dev = NULL;
	36
	37	static int progearbl_set_intensity(struct backlight_device *bd)
	38	{
599a52d1	39	int intensity = bd->props.brightness;
7a208463	40
599a52d1	41	if (bd->props.power != FB_BLANK_UNBLANK)
7a208463	42	intensity = 0;
599a52d1	43	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
7a208463 MJ	44	intensity = 0;
	45
	46	pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN);
	47
	48	return 0;
	49	}
	50
	51	static int progearbl_get_intensity(struct backlight_device *bd)
	52	{
	53	u8 intensity;
	54	pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity);
	55
	56	return intensity - HW_LEVEL_MIN;
	57	}
	58
9905a43b	59	static const struct backlight_ops progearbl_ops = {
7a208463 MJ	60	.get_brightness = progearbl_get_intensity,
	61	.update_status = progearbl_set_intensity,
	62	};
	63
	64	static int progearbl_probe(struct platform_device *pdev)
	65	{
a19a6ee6	66	struct backlight_properties props;
7a208463 MJ	67	u8 temp;
7a208463 MJ	68	struct backlight_device *progear_backlight_device;
a4ebb780	69	int ret;
7a208463	70
89952d13	71	pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, NULL);
7a208463	72	if (!pmu_dev) {
c3539731	73	pr_err("ALI M7101 PMU not found.\n");
7a208463 MJ	74	return -ENODEV;
	75	}
	76
89952d13	77	sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
7a208463	78	if (!sb_dev) {
c3539731	79	pr_err("ALI 1533 SB not found.\n");
a4ebb780 JS	80	ret = -ENODEV;
a4ebb780 JS	81	goto put_pmu;
7a208463 MJ	82	}
	83
	84	/* Set SB_MPS1 to enable brightness control. */
	85	pci_read_config_byte(sb_dev, SB_MPS1, &temp);
	86	pci_write_config_byte(sb_dev, SB_MPS1, temp \| 0x20);
	87
a19a6ee6	88	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	89	props.type = BACKLIGHT_RAW;
a19a6ee6	90	props.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
7a208463 MJ	91	progear_backlight_device = backlight_device_register("progear-bl",
7a208463 MJ	92	&pdev->dev, NULL,
a19a6ee6 MG	93	&progearbl_ops,
a19a6ee6 MG	94	&props);
a4ebb780 JS	95	if (IS_ERR(progear_backlight_device)) {
	96	ret = PTR_ERR(progear_backlight_device);
	97	goto put_sb;
	98	}
7a208463 MJ	99
	100	platform_set_drvdata(pdev, progear_backlight_device);
	101
599a52d1 RP	102	progear_backlight_device->props.power = FB_BLANK_UNBLANK;
599a52d1 RP	103	progear_backlight_device->props.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
7a208463 MJ	104	progearbl_set_intensity(progear_backlight_device);
	105
	106	return 0;
a4ebb780 JS	107	put_sb:
	108	pci_dev_put(sb_dev);
	109	put_pmu:
	110	pci_dev_put(pmu_dev);
	111	return ret;
7a208463 MJ	112	}
	113
	114	static int progearbl_remove(struct platform_device *pdev)
	115	{
	116	struct backlight_device *bd = platform_get_drvdata(pdev);
	117	backlight_device_unregister(bd);
	118
	119	return 0;
	120	}
	121
	122	static struct platform_driver progearbl_driver = {
	123	.probe = progearbl_probe,
	124	.remove = progearbl_remove,
	125	.driver = {
	126	.name = "progear-bl",
	127	},
	128	};
	129
	130	static struct platform_device *progearbl_device;
	131
	132	static int __init progearbl_init(void)
	133	{
	134	int ret = platform_driver_register(&progearbl_driver);
	135
6cd6f35a AM	136	if (ret)
	137	return ret;
	138	progearbl_device = platform_device_register_simple("progear-bl", -1,
	139	NULL, 0);
	140	if (IS_ERR(progearbl_device)) {
	141	platform_driver_unregister(&progearbl_driver);
	142	return PTR_ERR(progearbl_device);
7a208463 MJ	143	}
7a208463 MJ	144
6cd6f35a	145	return 0;
7a208463 MJ	146	}
	147
	148	static void __exit progearbl_exit(void)
	149	{
	150	pci_dev_put(pmu_dev);
	151	pci_dev_put(sb_dev);
	152
	153	platform_device_unregister(progearbl_device);
	154	platform_driver_unregister(&progearbl_driver);
	155	}
	156
	157	module_init(progearbl_init);
	158	module_exit(progearbl_exit);
	159
	160	MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
	161	MODULE_DESCRIPTION("ProGear Backlight Driver");
	162	MODULE_LICENSE("GPL");