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* 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_IWUSR | 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");
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