[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / samsung-laptop / samsung-laptop.c

/*
 * Samsung N130 Laptop driver
 *
 * Copyright (C) 2009 Greg Kroah-Hartman (gregkh@suse.de)
 * Copyright (C) 2009 Novell Inc.
 *
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/dmi.h>
#include <linux/platform_device.h>
#include <linux/rfkill.h>

/*
 * This driver is needed because a number of Samsung laptops do not hook
 * their control settings through ACPI.  So we have to poke around in the
 * BIOS to do things like brightness values, and "special" key controls.
 */

/*
 * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
 * be reserved by the BIOS (which really doesn't make much sense), we tell
 * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
 */
#define MAX_BRIGHT	0x07

/* Brightness is 0 - 8, as described above.  Value 0 is for the BIOS to use */
#define GET_BRIGHTNESS			0x00
#define SET_BRIGHTNESS			0x01

/* first byte:
 * 0x00 - wireless is off
 * 0x01 - wireless is on
 * second byte:
 * 0x02 - 3G is off
 * 0x03 - 3G is on
 * TODO, verify 3G is correct, that doesn't seem right...
 */
#define GET_WIRELESS_BUTTON		0x02
#define SET_WIRELESS_BUTTON		0x03

/* 0 is off, 1 is on */
#define GET_BACKLIGHT			0x04
#define SET_BACKLIGHT			0x05

/*
 * 0x80 or 0x00 - no action
 * 0x81 - recovery key pressed
 */
#define GET_RECOVERY_METHOD		0x06
#define SET_RECOVERY_METHOD		0x07

/* 0 is low, 1 is high */
#define GET_PERFORMANCE_LEVEL		0x08
#define SET_PERFORMANCE_LEVEL		0x09

/*
 * Tell the BIOS that Linux is running on this machine.
 * 81 is on, 80 is off
 */
#define SET_LINUX			0x0a


#define MAIN_FUNCTION			0x4c49

#define SABI_HEADER_PORT		0x00
#define SABI_HEADER_RE_MEM		0x02
#define SABI_HEADER_IFACEFUNC		0x03
#define SABI_HEADER_EN_MEM		0x04
#define SABI_HEADER_DATA_OFFSET		0x05
#define SABI_HEADER_DATA_SEGMENT	0x07

#define SABI_IFACE_MAIN			0x00
#define SABI_IFACE_SUB			0x02
#define SABI_IFACE_COMPLETE		0x04
#define SABI_IFACE_DATA			0x05

/* Structure to get data back to the calling function */
struct sabi_retval {
	u8 retval[20];
};

static void __iomem *sabi;
static void __iomem *sabi_iface;
static void __iomem *f0000_segment;
static struct backlight_device *backlight_device;
static struct mutex sabi_mutex;
static struct platform_device *sdev;
static struct rfkill *rfk;

static int force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force,
		"Disable the DMI check and forces the driver to be loaded");

static int debug;
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");

static int sabi_get_command(u8 command, struct sabi_retval *sretval)
{
	int retval = 0;
	u16 port = readw(sabi + SABI_HEADER_PORT);

	mutex_lock(&sabi_mutex);

	/* enable memory to be able to write to it */
	outb(readb(sabi + SABI_HEADER_EN_MEM), port);

	/* write out the command */
	writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
	writew(command, sabi_iface + SABI_IFACE_SUB);
	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
	outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);

	/* write protect memory to make it safe */
	outb(readb(sabi + SABI_HEADER_RE_MEM), port);

	/* see if the command actually succeeded */
	if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
	    readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
		/*
		 * It did!
		 * Save off the data into a structure so the caller use it.
		 * Right now we only care about the first 4 bytes,
		 * I suppose there are commands that need more, but I don't
		 * know about them.
		 */
		sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
		sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
		sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
		sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
		goto exit;
	}

	/* Something bad happened, so report it and error out */
	printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
		command, readb(sabi_iface + SABI_IFACE_COMPLETE),
		readb(sabi_iface + SABI_IFACE_DATA));
	retval = -EINVAL;
exit:
	mutex_unlock(&sabi_mutex);
	return retval;

}

static int sabi_set_command(u8 command, u8 data)
{
	int retval = 0;
	u16 port = readw(sabi + SABI_HEADER_PORT);

	mutex_lock(&sabi_mutex);

	/* enable memory to be able to write to it */
	outb(readb(sabi + SABI_HEADER_EN_MEM), port);

	/* write out the command */
	writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
	writew(command, sabi_iface + SABI_IFACE_SUB);
	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
	writeb(data, sabi_iface + SABI_IFACE_DATA);
	outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);

	/* write protect memory to make it safe */
	outb(readb(sabi + SABI_HEADER_RE_MEM), port);

	/* see if the command actually succeeded */
	if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
	    readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
		/* it did! */
		goto exit;
	}

	/* Something bad happened, so report it and error out */
	printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
		command, readb(sabi_iface + SABI_IFACE_COMPLETE),
		readb(sabi_iface + SABI_IFACE_DATA));
	retval = -EINVAL;
exit:
	mutex_unlock(&sabi_mutex);
	return retval;
}

static void test_backlight(void)
{
	struct sabi_retval sretval;

	sabi_get_command(GET_BACKLIGHT, &sretval);
	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);

	sabi_set_command(SET_BACKLIGHT, 0);
	printk(KERN_DEBUG "backlight should be off\n");

	sabi_get_command(GET_BACKLIGHT, &sretval);
	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);

	msleep(1000);

	sabi_set_command(SET_BACKLIGHT, 1);
	printk(KERN_DEBUG "backlight should be on\n");

	sabi_get_command(GET_BACKLIGHT, &sretval);
	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
}

static void test_wireless(void)
{
	struct sabi_retval sretval;

	sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);

	sabi_set_command(SET_WIRELESS_BUTTON, 0);
	printk(KERN_DEBUG "wireless led should be off\n");

	sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);

	msleep(1000);

	sabi_set_command(SET_WIRELESS_BUTTON, 1);
	printk(KERN_DEBUG "wireless led should be on\n");

	sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
}

static u8 read_brightness(void)
{
	struct sabi_retval sretval;
	int user_brightness = 0;
	int retval;

	retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
	if (!retval)
		user_brightness = sretval.retval[0];
		if (user_brightness != 0)
			--user_brightness;
	return user_brightness;
}

static void set_brightness(u8 user_brightness)
{
	sabi_set_command(SET_BRIGHTNESS, user_brightness + 1);
}

static int get_brightness(struct backlight_device *bd)
{
	return (int)read_brightness();
}

static int update_status(struct backlight_device *bd)
{
	set_brightness(bd->props.brightness);

	if (bd->props.power == FB_BLANK_UNBLANK)
		sabi_set_command(SET_BACKLIGHT, 1);
	else
		sabi_set_command(SET_BACKLIGHT, 0);
	return 0;
}

static struct backlight_ops backlight_ops = {
	.get_brightness	= get_brightness,
	.update_status	= update_status,
};

static int rfkill_set(void *data, bool blocked)
{
	/* Do something with blocked...*/
	/*
	 * blocked == false is on
	 * blocked == true is off
	 */
	if (blocked)
		sabi_set_command(SET_WIRELESS_BUTTON, 0);
	else
		sabi_set_command(SET_WIRELESS_BUTTON, 1);

	return 0;
}

static struct rfkill_ops rfkill_ops = {
	.set_block = rfkill_set,
};

static int init_wireless(struct platform_device *sdev)
{
	int retval;

	rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
			   &rfkill_ops, NULL);
	if (!rfk)
		return -ENOMEM;

	retval = rfkill_register(rfk);
	if (retval) {
		rfkill_destroy(rfk);
		return -ENODEV;
	}

	return 0;
}

static void destroy_wireless(void)
{
	rfkill_unregister(rfk);
	rfkill_destroy(rfk);
}

static ssize_t get_silent_state(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct sabi_retval sretval;
	int retval;

	/* Read the state */
	retval = sabi_get_command(GET_PERFORMANCE_LEVEL, &sretval);
	if (retval)
		return retval;

	/* The logic is backwards, yeah, lots of fun... */
	if (sretval.retval[0] == 0)
		retval = 1;
	else
		retval = 0;
	return sprintf(buf, "%d\n", retval);
}

static ssize_t set_silent_state(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	char value;

	if (count >= 1) {
		value = buf[0];
		if ((value == '0') || (value == 'n') || (value == 'N')) {
			/* Turn speed up */
			sabi_set_command(SET_PERFORMANCE_LEVEL, 0x01);
		} else if ((value == '1') || (value == 'y') || (value == 'Y')) {
			/* Turn speed down */
			sabi_set_command(SET_PERFORMANCE_LEVEL, 0x00);
		} else {
			return -EINVAL;
		}
	}
	return count;
}
static DEVICE_ATTR(silent, S_IWUGO | S_IRUGO,
		   get_silent_state, set_silent_state);


static int __init dmi_check_cb(const struct dmi_system_id *id)
{
	printk(KERN_INFO KBUILD_MODNAME ": found laptop model '%s'\n",
		id->ident);
	return 0;
}

static struct dmi_system_id __initdata samsung_dmi_table[] = {
	{
		.ident = "N128",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
			DMI_MATCH(DMI_BOARD_NAME, "N128"),
		},
		.callback = dmi_check_cb,
	},
	{
		.ident = "N130",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR,
					"SAMSUNG ELECTRONICS CO., LTD."),
			DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
			DMI_MATCH(DMI_BOARD_NAME, "N130"),
		},
		.callback = dmi_check_cb,
	},
	{ },
};
MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);

static int __init samsung_init(void)
{
	struct backlight_properties props;
	struct sabi_retval sretval;
	const char *testStr = "SECLINUX";
	void __iomem *memcheck;
	unsigned int ifaceP;
	int pStr;
	int loca;
	int retval;

	mutex_init(&sabi_mutex);

	if (!force && !dmi_check_system(samsung_dmi_table))
		return -ENODEV;

	f0000_segment = ioremap(0xf0000, 0xffff);
	if (!f0000_segment) {
		printk(KERN_ERR "Can't map the segment at 0xf0000\n");
		return -EINVAL;
	}

	/* Try to find the signature "SECLINUX" in memory to find the header */
	pStr = 0;
	memcheck = f0000_segment;
	for (loca = 0; loca < 0xffff; loca++) {
		char temp = readb(memcheck + loca);

		if (temp == testStr[pStr]) {
			if (pStr == strlen(testStr)-1)
				break;
			++pStr;
		} else {
			pStr = 0;
		}
	}
	if (loca == 0xffff) {
		printk(KERN_ERR "This computer does not support SABI\n");
		goto error_no_signature;
		}

	/* point to the SMI port Number */
	loca += 1;
	sabi = (memcheck + loca);

	if (debug) {
		printk(KERN_DEBUG "This computer supports SABI==%x\n",
			loca + 0xf0000 - 6);
		printk(KERN_DEBUG "SABI header:\n");
		printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
			readw(sabi + SABI_HEADER_PORT));
		printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
			readb(sabi + SABI_HEADER_IFACEFUNC));
		printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
			readb(sabi + SABI_HEADER_EN_MEM));
		printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
			readb(sabi + SABI_HEADER_RE_MEM));
		printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
			readw(sabi + SABI_HEADER_DATA_OFFSET));
		printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
			readw(sabi + SABI_HEADER_DATA_SEGMENT));
	}

	/* Get a pointer to the SABI Interface */
	ifaceP = (readw(sabi + SABI_HEADER_DATA_SEGMENT) & 0x0ffff) << 4;
	ifaceP += readw(sabi + SABI_HEADER_DATA_OFFSET) & 0x0ffff;
	sabi_iface = ioremap(ifaceP, 16);
	if (!sabi_iface) {
		printk(KERN_ERR "Can't remap %x\n", ifaceP);
		goto exit;
	}
	if (debug) {
		printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
		printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);

		test_backlight();
		test_wireless();

		retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
		printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
	}

	/* Turn on "Linux" mode in the BIOS */
	retval = sabi_set_command(SET_LINUX, 0x81);
	if (retval) {
		printk(KERN_ERR KBUILD_MODNAME ": Linux mode was not set!\n");
		goto error_no_platform;
	}

	/* knock up a platform device to hang stuff off of */
	sdev = platform_device_register_simple("samsung", -1, NULL, 0);
	if (IS_ERR(sdev))
		goto error_no_platform;

	/* create a backlight device to talk to this one */
	memset(&props, 0, sizeof(struct backlight_properties));
	props.max_brightness = MAX_BRIGHT;
	backlight_device = backlight_device_register("samsung", &sdev->dev,
						     NULL, &backlight_ops,
						     &props);
	if (IS_ERR(backlight_device))
		goto error_no_backlight;

	backlight_device->props.brightness = read_brightness();
	backlight_device->props.power = FB_BLANK_UNBLANK;
	backlight_update_status(backlight_device);

	retval = init_wireless(sdev);
	if (retval)
		goto error_no_rfk;

	retval = device_create_file(&sdev->dev, &dev_attr_silent);
	if (retval)
		goto error_file_create;

exit:
	return 0;

error_file_create:
	destroy_wireless();

error_no_rfk:
	backlight_device_unregister(backlight_device);

error_no_backlight:
	platform_device_unregister(sdev);

error_no_platform:
	iounmap(sabi_iface);

error_no_signature:
	iounmap(f0000_segment);
	return -EINVAL;
}

static void __exit samsung_exit(void)
{
	/* Turn off "Linux" mode in the BIOS */
	sabi_set_command(SET_LINUX, 0x80);

	device_remove_file(&sdev->dev, &dev_attr_silent);
	backlight_device_unregister(backlight_device);
	destroy_wireless();
	iounmap(sabi_iface);
	iounmap(f0000_segment);
	platform_device_unregister(sdev);
}

module_init(samsung_init);
module_exit(samsung_exit);

MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
MODULE_DESCRIPTION("Samsung Backlight driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
d189164a GKH	1	/*
	2	* Samsung N130 Laptop driver
	3	*
	4	* Copyright (C) 2009 Greg Kroah-Hartman (gregkh@suse.de)
	5	* Copyright (C) 2009 Novell Inc.
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*
	11	*/
d189164a GKH	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/delay.h>
	16	#include <linux/pci.h>
	17	#include <linux/backlight.h>
	18	#include <linux/fb.h>
	19	#include <linux/dmi.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/rfkill.h>
	22
	23	/*
	24	* This driver is needed because a number of Samsung laptops do not hook
	25	* their control settings through ACPI. So we have to poke around in the
	26	* BIOS to do things like brightness values, and "special" key controls.
	27	*/
	28
	29	/*
	30	* We have 0 - 8 as valid brightness levels. The specs say that level 0 should
	31	* be reserved by the BIOS (which really doesn't make much sense), we tell
	32	* userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
	33	*/
	34	#define MAX_BRIGHT 0x07
	35
	36	/* Brightness is 0 - 8, as described above. Value 0 is for the BIOS to use */
	37	#define GET_BRIGHTNESS 0x00
	38	#define SET_BRIGHTNESS 0x01
	39
	40	/* first byte:
	41	* 0x00 - wireless is off
	42	* 0x01 - wireless is on
	43	* second byte:
	44	* 0x02 - 3G is off
	45	* 0x03 - 3G is on
	46	* TODO, verify 3G is correct, that doesn't seem right...
	47	*/
	48	#define GET_WIRELESS_BUTTON 0x02
	49	#define SET_WIRELESS_BUTTON 0x03
	50
	51	/* 0 is off, 1 is on */
	52	#define GET_BACKLIGHT 0x04
	53	#define SET_BACKLIGHT 0x05
	54
	55	/*
	56	* 0x80 or 0x00 - no action
	57	* 0x81 - recovery key pressed
	58	*/
	59	#define GET_RECOVERY_METHOD 0x06
	60	#define SET_RECOVERY_METHOD 0x07
	61
	62	/* 0 is low, 1 is high */
	63	#define GET_PERFORMANCE_LEVEL 0x08
	64	#define SET_PERFORMANCE_LEVEL 0x09
	65
	66	/*
	67	* Tell the BIOS that Linux is running on this machine.
	68	* 81 is on, 80 is off
	69	*/
	70	#define SET_LINUX 0x0a
	71
	72
	73	#define MAIN_FUNCTION 0x4c49
	74
	75	#define SABI_HEADER_PORT 0x00
76	#define SABI_HEADER_RE_MEM 0x02
77	#define SABI_HEADER_IFACEFUNC 0x03
78	#define SABI_HEADER_EN_MEM 0x04
79	#define SABI_HEADER_DATA_OFFSET 0x05
80	#define SABI_HEADER_DATA_SEGMENT 0x07
81
82	#define SABI_IFACE_MAIN 0x00
83	#define SABI_IFACE_SUB 0x02
84	#define SABI_IFACE_COMPLETE 0x04
85	#define SABI_IFACE_DATA 0x05
86
87	/* Structure to get data back to the calling function */
88	struct sabi_retval {
89	u8 retval[20];
90	};
91
92	static void __iomem *sabi;
93	static void __iomem *sabi_iface;
94	static void __iomem *f0000_segment;
95	static struct backlight_device *backlight_device;
96	static struct mutex sabi_mutex;
97	static struct platform_device *sdev;
98	static struct rfkill *rfk;
99
100	static int force;
101	module_param(force, bool, 0);
d3c796fd CC	102	MODULE_PARM_DESC(force,
d3c796fd CC	103	"Disable the DMI check and forces the driver to be loaded");
d189164a GKH	104
	105	static int debug;
	106	module_param(debug, bool, S_IRUGO \| S_IWUSR);
	107	MODULE_PARM_DESC(debug, "Debug enabled or not");
	108
	109	static int sabi_get_command(u8 command, struct sabi_retval *sretval)
	110	{
	111	int retval = 0;
	112	u16 port = readw(sabi + SABI_HEADER_PORT);
	113
	114	mutex_lock(&sabi_mutex);
	115
	116	/* enable memory to be able to write to it */
	117	outb(readb(sabi + SABI_HEADER_EN_MEM), port);
	118
	119	/* write out the command */
	120	writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
	121	writew(command, sabi_iface + SABI_IFACE_SUB);
	122	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
	123	outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);
	124
	125	/* write protect memory to make it safe */
	126	outb(readb(sabi + SABI_HEADER_RE_MEM), port);
	127
	128	/* see if the command actually succeeded */
	129	if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
	130	readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
	131	/*
	132	* It did!
	133	* Save off the data into a structure so the caller use it.
	134	* Right now we only care about the first 4 bytes,
	135	* I suppose there are commands that need more, but I don't
	136	* know about them.
	137	*/
	138	sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
	139	sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
	140	sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
	141	sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
	142	goto exit;
	143	}
	144
	145	/* Something bad happened, so report it and error out */
	146	printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
	147	command, readb(sabi_iface + SABI_IFACE_COMPLETE),
	148	readb(sabi_iface + SABI_IFACE_DATA));
	149	retval = -EINVAL;
	150	exit:
	151	mutex_unlock(&sabi_mutex);
	152	return retval;
	153
	154	}
	155
	156	static int sabi_set_command(u8 command, u8 data)
	157	{
	158	int retval = 0;
	159	u16 port = readw(sabi + SABI_HEADER_PORT);
	160
	161	mutex_lock(&sabi_mutex);
	162
	163	/* enable memory to be able to write to it */
	164	outb(readb(sabi + SABI_HEADER_EN_MEM), port);
	165
	166	/* write out the command */
	167	writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
168	writew(command, sabi_iface + SABI_IFACE_SUB);
169	writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
170	writeb(data, sabi_iface + SABI_IFACE_DATA);
171	outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);
172
173	/* write protect memory to make it safe */
174	outb(readb(sabi + SABI_HEADER_RE_MEM), port);
175
176	/* see if the command actually succeeded */
177	if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
178	readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
179	/* it did! */
180	goto exit;
181	}
182
183	/* Something bad happened, so report it and error out */
184	printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
185	command, readb(sabi_iface + SABI_IFACE_COMPLETE),
186	readb(sabi_iface + SABI_IFACE_DATA));
187	retval = -EINVAL;
188	exit:
189	mutex_unlock(&sabi_mutex);
190	return retval;
191	}
192
193	static void test_backlight(void)
194	{
195	struct sabi_retval sretval;
196
197	sabi_get_command(GET_BACKLIGHT, &sretval);
198	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
199
200	sabi_set_command(SET_BACKLIGHT, 0);
201	printk(KERN_DEBUG "backlight should be off\n");
202
203	sabi_get_command(GET_BACKLIGHT, &sretval);
204	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
205
206	msleep(1000);
207
208	sabi_set_command(SET_BACKLIGHT, 1);
209	printk(KERN_DEBUG "backlight should be on\n");
210
211	sabi_get_command(GET_BACKLIGHT, &sretval);
212	printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
213	}
214
215	static void test_wireless(void)
216	{
217	struct sabi_retval sretval;
218
219	sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
220	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
221
222	sabi_set_command(SET_WIRELESS_BUTTON, 0);
223	printk(KERN_DEBUG "wireless led should be off\n");
224
225	sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
226	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
227
228	msleep(1000);
229
230	sabi_set_command(SET_WIRELESS_BUTTON, 1);
231	printk(KERN_DEBUG "wireless led should be on\n");
232
233	sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
234	printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
235	}
236
237	static u8 read_brightness(void)
238	{
239	struct sabi_retval sretval;
240	int user_brightness = 0;
241	int retval;
242
243	retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
244	if (!retval)
245	user_brightness = sretval.retval[0];
246	if (user_brightness != 0)
247	--user_brightness;
248	return user_brightness;
249	}
250
251	static void set_brightness(u8 user_brightness)
252	{
253	sabi_set_command(SET_BRIGHTNESS, user_brightness + 1);
254	}
255
256	static int get_brightness(struct backlight_device *bd)
257	{
258	return (int)read_brightness();
259	}
260
261	static int update_status(struct backlight_device *bd)
262	{
263	set_brightness(bd->props.brightness);
264
265	if (bd->props.power == FB_BLANK_UNBLANK)
266	sabi_set_command(SET_BACKLIGHT, 1);
267	else
268	sabi_set_command(SET_BACKLIGHT, 0);
269	return 0;
270	}
271
272	static struct backlight_ops backlight_ops = {
273	.get_brightness = get_brightness,
274	.update_status = update_status,
275	};
276
d189164a GKH	277	static int rfkill_set(void *data, bool blocked)
	278	{
	279	/* Do something with blocked...*/
	280	/*
	281	* blocked == false is on
	282	* blocked == true is off
	283	*/
	284	if (blocked)
	285	sabi_set_command(SET_WIRELESS_BUTTON, 0);
	286	else
	287	sabi_set_command(SET_WIRELESS_BUTTON, 1);
	288
	289	return 0;
	290	}
	291
	292	static struct rfkill_ops rfkill_ops = {
	293	.set_block = rfkill_set,
	294	};
	295
	296	static int init_wireless(struct platform_device *sdev)
	297	{
	298	int retval;
	299
	300	rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
	301	&rfkill_ops, NULL);
	302	if (!rfk)
	303	return -ENOMEM;
	304
	305	retval = rfkill_register(rfk);
	306	if (retval) {
	307	rfkill_destroy(rfk);
	308	return -ENODEV;
	309	}
	310
	311	return 0;
	312	}
	313
	314	static void destroy_wireless(void)
	315	{
	316	rfkill_unregister(rfk);
	317	rfkill_destroy(rfk);
	318	}
	319
d189164a GKH	320	static ssize_t get_silent_state(struct device *dev,
	321	struct device_attribute attr, char buf)
	322	{
	323	struct sabi_retval sretval;
	324	int retval;
	325
	326	/* Read the state */
	327	retval = sabi_get_command(GET_PERFORMANCE_LEVEL, &sretval);
	328	if (retval)
	329	return retval;
	330
	331	/* The logic is backwards, yeah, lots of fun... */
	332	if (sretval.retval[0] == 0)
	333	retval = 1;
	334	else
	335	retval = 0;
	336	return sprintf(buf, "%d\n", retval);
	337	}
	338
	339	static ssize_t set_silent_state(struct device *dev,
	340	struct device_attribute attr, const char buf,
	341	size_t count)
	342	{
	343	char value;
	344
	345	if (count >= 1) {
	346	value = buf[0];
	347	if ((value == '0') \|\| (value == 'n') \|\| (value == 'N')) {
	348	/* Turn speed up */
	349	sabi_set_command(SET_PERFORMANCE_LEVEL, 0x01);
	350	} else if ((value == '1') \|\| (value == 'y') \|\| (value == 'Y')) {
	351	/* Turn speed down */
	352	sabi_set_command(SET_PERFORMANCE_LEVEL, 0x00);
	353	} else {
	354	return -EINVAL;
	355	}
	356	}
	357	return count;
	358	}
	359	static DEVICE_ATTR(silent, S_IWUGO \| S_IRUGO,
	360	get_silent_state, set_silent_state);
	361
	362
	363	static int __init dmi_check_cb(const struct dmi_system_id *id)
	364	{
	365	printk(KERN_INFO KBUILD_MODNAME ": found laptop model '%s'\n",
	366	id->ident);
	367	return 0;
	368	}
	369
	370	static struct dmi_system_id __initdata samsung_dmi_table[] = {
	371	{
	372	.ident = "N128",
	373	.matches = {
d3c796fd CC	374	DMI_MATCH(DMI_SYS_VENDOR,
d3c796fd CC	375	"SAMSUNG ELECTRONICS CO., LTD."),
d189164a GKH	376	DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
	377	DMI_MATCH(DMI_BOARD_NAME, "N128"),
	378	},
	379	.callback = dmi_check_cb,
	380	},
	381	{
	382	.ident = "N130",
	383	.matches = {
d3c796fd CC	384	DMI_MATCH(DMI_SYS_VENDOR,
d3c796fd CC	385	"SAMSUNG ELECTRONICS CO., LTD."),
d189164a GKH	386	DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
	387	DMI_MATCH(DMI_BOARD_NAME, "N130"),
	388	},
	389	.callback = dmi_check_cb,
	390	},
	391	{ },
	392	};
	393	MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
	394
	395	static int __init samsung_init(void)
	396	{
a19a6ee6	397	struct backlight_properties props;
d189164a GKH	398	struct sabi_retval sretval;
	399	const char *testStr = "SECLINUX";
	400	void __iomem *memcheck;
	401	unsigned int ifaceP;
	402	int pStr;
	403	int loca;
	404	int retval;
	405
	406	mutex_init(&sabi_mutex);
	407
	408	if (!force && !dmi_check_system(samsung_dmi_table))
	409	return -ENODEV;
	410
	411	f0000_segment = ioremap(0xf0000, 0xffff);
	412	if (!f0000_segment) {
	413	printk(KERN_ERR "Can't map the segment at 0xf0000\n");
	414	return -EINVAL;
	415	}
	416
	417	/* Try to find the signature "SECLINUX" in memory to find the header */
	418	pStr = 0;
	419	memcheck = f0000_segment;
	420	for (loca = 0; loca < 0xffff; loca++) {
	421	char temp = readb(memcheck + loca);
	422
	423	if (temp == testStr[pStr]) {
	424	if (pStr == strlen(testStr)-1)
	425	break;
	426	++pStr;
	427	} else {
	428	pStr = 0;
	429	}
	430	}
	431	if (loca == 0xffff) {
	432	printk(KERN_ERR "This computer does not support SABI\n");
	433	goto error_no_signature;
	434	}
	435
	436	/* point to the SMI port Number */
	437	loca += 1;
	438	sabi = (memcheck + loca);
	439
	440	if (debug) {
	441	printk(KERN_DEBUG "This computer supports SABI==%x\n",
	442	loca + 0xf0000 - 6);
	443	printk(KERN_DEBUG "SABI header:\n");
	444	printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
	445	readw(sabi + SABI_HEADER_PORT));
	446	printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
	447	readb(sabi + SABI_HEADER_IFACEFUNC));
	448	printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
	449	readb(sabi + SABI_HEADER_EN_MEM));
	450	printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
	451	readb(sabi + SABI_HEADER_RE_MEM));
	452	printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
	453	readw(sabi + SABI_HEADER_DATA_OFFSET));
	454	printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
	455	readw(sabi + SABI_HEADER_DATA_SEGMENT));
	456	}
	457
	458	/* Get a pointer to the SABI Interface */
	459	ifaceP = (readw(sabi + SABI_HEADER_DATA_SEGMENT) & 0x0ffff) << 4;
	460	ifaceP += readw(sabi + SABI_HEADER_DATA_OFFSET) & 0x0ffff;
	461	sabi_iface = ioremap(ifaceP, 16);
462	if (!sabi_iface) {
463	printk(KERN_ERR "Can't remap %x\n", ifaceP);
464	goto exit;
465	}
466	if (debug) {
467	printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
468	printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);
469
470	test_backlight();
471	test_wireless();
472
473	retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
474	printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
475	}
476
477	/* Turn on "Linux" mode in the BIOS */
478	retval = sabi_set_command(SET_LINUX, 0x81);
479	if (retval) {
480	printk(KERN_ERR KBUILD_MODNAME ": Linux mode was not set!\n");
481	goto error_no_platform;
482	}
483
484	/* knock up a platform device to hang stuff off of */
485	sdev = platform_device_register_simple("samsung", -1, NULL, 0);
486	if (IS_ERR(sdev))
487	goto error_no_platform;
488
489	/* create a backlight device to talk to this one */
a19a6ee6 MG	490	memset(&props, 0, sizeof(struct backlight_properties));
a19a6ee6 MG	491	props.max_brightness = MAX_BRIGHT;
d189164a	492	backlight_device = backlight_device_register("samsung", &sdev->dev,
a19a6ee6 MG	493	NULL, &backlight_ops,
a19a6ee6 MG	494	&props);
d189164a GKH	495	if (IS_ERR(backlight_device))
	496	goto error_no_backlight;
	497
d189164a GKH	498	backlight_device->props.brightness = read_brightness();
	499	backlight_device->props.power = FB_BLANK_UNBLANK;
	500	backlight_update_status(backlight_device);
	501
	502	retval = init_wireless(sdev);
	503	if (retval)
	504	goto error_no_rfk;
	505
	506	retval = device_create_file(&sdev->dev, &dev_attr_silent);
	507	if (retval)
	508	goto error_file_create;
	509
	510	exit:
	511	return 0;
	512
	513	error_file_create:
	514	destroy_wireless();
	515
	516	error_no_rfk:
	517	backlight_device_unregister(backlight_device);
	518
	519	error_no_backlight:
	520	platform_device_unregister(sdev);
	521
	522	error_no_platform:
	523	iounmap(sabi_iface);
	524
	525	error_no_signature:
	526	iounmap(f0000_segment);
	527	return -EINVAL;
	528	}
	529
	530	static void __exit samsung_exit(void)
	531	{
	532	/* Turn off "Linux" mode in the BIOS */
	533	sabi_set_command(SET_LINUX, 0x80);
	534
	535	device_remove_file(&sdev->dev, &dev_attr_silent);
	536	backlight_device_unregister(backlight_device);
	537	destroy_wireless();
	538	iounmap(sabi_iface);
	539	iounmap(f0000_segment);
	540	platform_device_unregister(sdev);
	541	}
	542
	543	module_init(samsung_init);
	544	module_exit(samsung_exit);
	545
	546	MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
	547	MODULE_DESCRIPTION("Samsung Backlight driver");
	548	MODULE_LICENSE("GPL");