diff options
Diffstat (limited to 'drivers/platform/x86/samsung-laptop.c')
| -rw-r--r-- | drivers/platform/x86/samsung-laptop.c | 843 |
1 files changed, 843 insertions, 0 deletions
diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c new file mode 100644 index 000000000000..d347116d150e --- /dev/null +++ b/drivers/platform/x86/samsung-laptop.c @@ -0,0 +1,843 @@ +/* + * Samsung Laptop driver + * + * Copyright (C) 2009,2011 Greg Kroah-Hartman (gregkh@suse.de) + * Copyright (C) 2009,2011 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. + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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 + + +#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]; +}; + +struct sabi_header_offsets { + u8 port; + u8 re_mem; + u8 iface_func; + u8 en_mem; + u8 data_offset; + u8 data_segment; +}; + +struct sabi_commands { + /* + * Brightness is 0 - 8, as described above. + * Value 0 is for the BIOS to use + */ + u8 get_brightness; + u8 set_brightness; + + /* + * 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... + */ + u8 get_wireless_button; + u8 set_wireless_button; + + /* 0 is off, 1 is on */ + u8 get_backlight; + u8 set_backlight; + + /* + * 0x80 or 0x00 - no action + * 0x81 - recovery key pressed + */ + u8 get_recovery_mode; + u8 set_recovery_mode; + + /* + * on seclinux: 0 is low, 1 is high, + * on swsmi: 0 is normal, 1 is silent, 2 is turbo + */ + u8 get_performance_level; + u8 set_performance_level; + + /* + * Tell the BIOS that Linux is running on this machine. + * 81 is on, 80 is off + */ + u8 set_linux; +}; + +struct sabi_performance_level { + const char *name; + u8 value; +}; + +struct sabi_config { + const char *test_string; + u16 main_function; + const struct sabi_header_offsets header_offsets; + const struct sabi_commands commands; + const struct sabi_performance_level performance_levels[4]; + u8 min_brightness; + u8 max_brightness; +}; + +static const struct sabi_config sabi_configs[] = { + { + .test_string = "SECLINUX", + + .main_function = 0x4c49, + + .header_offsets = { + .port = 0x00, + .re_mem = 0x02, + .iface_func = 0x03, + .en_mem = 0x04, + .data_offset = 0x05, + .data_segment = 0x07, + }, + + .commands = { + .get_brightness = 0x00, + .set_brightness = 0x01, + + .get_wireless_button = 0x02, + .set_wireless_button = 0x03, + + .get_backlight = 0x04, + .set_backlight = 0x05, + + .get_recovery_mode = 0x06, + .set_recovery_mode = 0x07, + + .get_performance_level = 0x08, + .set_performance_level = 0x09, + + .set_linux = 0x0a, + }, + + .performance_levels = { + { + .name = "silent", + .value = 0, + }, + { + .name = "normal", + .value = 1, + }, + { }, + }, + .min_brightness = 1, + .max_brightness = 8, + }, + { + .test_string = "SwSmi@", + + .main_function = 0x5843, + + .header_offsets = { + .port = 0x00, + .re_mem = 0x04, + .iface_func = 0x02, + .en_mem = 0x03, + .data_offset = 0x05, + .data_segment = 0x07, + }, + + .commands = { + .get_brightness = 0x10, + .set_brightness = 0x11, + + .get_wireless_button = 0x12, + .set_wireless_button = 0x13, + + .get_backlight = 0x2d, + .set_backlight = 0x2e, + + .get_recovery_mode = 0xff, + .set_recovery_mode = 0xff, + + .get_performance_level = 0x31, + .set_performance_level = 0x32, + + .set_linux = 0xff, + }, + + .performance_levels = { + { + .name = "normal", + .value = 0, + }, + { + .name = "silent", + .value = 1, + }, + { + .name = "overclock", + .value = 2, + }, + { }, + }, + .min_brightness = 0, + .max_brightness = 8, + }, + { }, +}; + +static const struct sabi_config *sabi_config; + +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_config->header_offsets.port); + u8 complete, iface_data; + + mutex_lock(&sabi_mutex); + + /* enable memory to be able to write to it */ + outb(readb(sabi + sabi_config->header_offsets.en_mem), port); + + /* write out the command */ + writew(sabi_config->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_config->header_offsets.iface_func), port); + + /* write protect memory to make it safe */ + outb(readb(sabi + sabi_config->header_offsets.re_mem), port); + + /* see if the command actually succeeded */ + complete = readb(sabi_iface + SABI_IFACE_COMPLETE); + iface_data = readb(sabi_iface + SABI_IFACE_DATA); + if (complete != 0xaa || iface_data == 0xff) { + pr_warn("SABI get command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n", + command, complete, iface_data); + retval = -EINVAL; + goto exit; + } + /* + * Save off the data into a structure so the caller use it. + * Right now we only want the first 4 bytes, + * There are commands that need more, but not for the ones we + * currently care about. + */ + 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); + +exit: + mutex_unlock(&sabi_mutex); + return retval; + +} + +static int sabi_set_command(u8 command, u8 data) +{ + int retval = 0; + u16 port = readw(sabi + sabi_config->header_offsets.port); + u8 complete, iface_data; + + mutex_lock(&sabi_mutex); + + /* enable memory to be able to write to it */ + outb(readb(sabi + sabi_config->header_offsets.en_mem), port); + + /* write out the command */ + writew(sabi_config->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_config->header_offsets.iface_func), port); + + /* write protect memory to make it safe */ + outb(readb(sabi + sabi_config->header_offsets.re_mem), port); + + /* see if the command actually succeeded */ + complete = readb(sabi_iface + SABI_IFACE_COMPLETE); + iface_data = readb(sabi_iface + SABI_IFACE_DATA); + if (complete != 0xaa || iface_data == 0xff) { + pr_warn("SABI set command 0x%02x failed with completion flag 0x%02x and data 0x%02x\n", + command, complete, iface_data); + retval = -EINVAL; + } + + mutex_unlock(&sabi_mutex); + return retval; +} + +static void test_backlight(void) +{ + struct sabi_retval sretval; + + sabi_get_command(sabi_config->commands.get_backlight, &sretval); + printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); + + sabi_set_command(sabi_config->commands.set_backlight, 0); + printk(KERN_DEBUG "backlight should be off\n"); + + sabi_get_command(sabi_config->commands.get_backlight, &sretval); + printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]); + + msleep(1000); + + sabi_set_command(sabi_config->commands.set_backlight, 1); + printk(KERN_DEBUG "backlight should be on\n"); + + sabi_get_command(sabi_config->commands.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(sabi_config->commands.get_wireless_button, &sretval); + printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); + + sabi_set_command(sabi_config->commands.set_wireless_button, 0); + printk(KERN_DEBUG "wireless led should be off\n"); + + sabi_get_command(sabi_config->commands.get_wireless_button, &sretval); + printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]); + + msleep(1000); + + sabi_set_command(sabi_config->commands.set_wireless_button, 1); + printk(KERN_DEBUG "wireless led should be on\n"); + + sabi_get_command(sabi_config->commands.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(sabi_config->commands.get_brightness, + &sretval); + if (!retval) { + user_brightness = sretval.retval[0]; + if (user_brightness != 0) + user_brightness -= sabi_config->min_brightness; + } + return user_brightness; +} + +static void set_brightness(u8 user_brightness) +{ + u8 user_level = user_brightness - sabi_config->min_brightness; + + sabi_set_command(sabi_config->commands.set_brightness, user_level); +} + +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(sabi_config->commands.set_backlight, 1); + else + sabi_set_command(sabi_config->commands.set_backlight, 0); + return 0; +} + +static const 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(sabi_config->commands.set_wireless_button, 0); + else + sabi_set_command(sabi_config->commands.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_performance_level(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sabi_retval sretval; + int retval; + int i; + + /* Read the state */ + retval = sabi_get_command(sabi_config->commands.get_performance_level, + &sretval); + if (retval) + return retval; + + /* The logic is backwards, yeah, lots of fun... */ + for (i = 0; sabi_config->performance_levels[i].name; ++i) { + if (sretval.retval[0] == sabi_config->performance_levels[i].value) + return sprintf(buf, "%s\n", sabi_config->performance_levels[i].name); + } + return sprintf(buf, "%s\n", "unknown"); +} + +static ssize_t set_performance_level(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + if (count >= 1) { + int i; + for (i = 0; sabi_config->performance_levels[i].name; ++i) { + const struct sabi_performance_level *level = + &sabi_config->performance_levels[i]; + if (!strncasecmp(level->name, buf, strlen(level->name))) { + sabi_set_command(sabi_config->commands.set_performance_level, + level->value); + break; + } + } + if (!sabi_config->performance_levels[i].name) + return -EINVAL; + } + return count; +} +static DEVICE_ATTR(performance_level, S_IWUSR | S_IRUGO, + get_performance_level, set_performance_level); + + +static int __init dmi_check_cb(const struct dmi_system_id *id) +{ + pr_info("found laptop model '%s'\n", + id->ident); + return 1; +} + +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, + }, + { + .ident = "X125", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "X125"), + DMI_MATCH(DMI_BOARD_NAME, "X125"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "X120/X170", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "X120/X170"), + DMI_MATCH(DMI_BOARD_NAME, "X120/X170"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "NC10", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "NC10"), + DMI_MATCH(DMI_BOARD_NAME, "NC10"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "NP-Q45", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"), + DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "X360", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "X360"), + DMI_MATCH(DMI_BOARD_NAME, "X360"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "R410 Plus", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "R410P"), + DMI_MATCH(DMI_BOARD_NAME, "R460"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "R518", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "R518"), + DMI_MATCH(DMI_BOARD_NAME, "R518"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "R519/R719", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "R519/R719"), + DMI_MATCH(DMI_BOARD_NAME, "R519/R719"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "N150/N210/N220/N230", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220/N230"), + DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220/N230"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "N150P/N210P/N220P", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"), + DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "R530/R730", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "R530/R730"), + DMI_MATCH(DMI_BOARD_NAME, "R530/R730"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "NF110/NF210/NF310", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"), + DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "N145P/N250P/N260P", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"), + DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "R70/R71", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, + "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "R70/R71"), + DMI_MATCH(DMI_BOARD_NAME, "R70/R71"), + }, + .callback = dmi_check_cb, + }, + { + .ident = "P460", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + DMI_MATCH(DMI_PRODUCT_NAME, "P460"), + DMI_MATCH(DMI_BOARD_NAME, "P460"), + }, + .callback = dmi_check_cb, + }, + { }, +}; +MODULE_DEVICE_TABLE(dmi, samsung_dmi_table); + +static int find_signature(void __iomem *memcheck, const char *testStr) +{ + int i = 0; + int loca; + + for (loca = 0; loca < 0xffff; loca++) { + char temp = readb(memcheck + loca); + + if (temp == testStr[i]) { + if (i == strlen(testStr)-1) + break; + ++i; + } else { + i = 0; + } + } + return loca; +} + +static int __init samsung_init(void) +{ + struct backlight_properties props; + struct sabi_retval sretval; + unsigned int ifaceP; + int i; + int loca; + int retval; + + mutex_init(&sabi_mutex); + + if (!force && !dmi_check_system(samsung_dmi_table)) + return -ENODEV; + + f0000_segment = ioremap_nocache(0xf0000, 0xffff); + if (!f0000_segment) { + pr_err("Can't map the segment at 0xf0000\n"); + return -EINVAL; + } + + /* Try to find one of the signatures in memory to find the header */ + for (i = 0; sabi_configs[i].test_string != 0; ++i) { + sabi_config = &sabi_configs[i]; + loca = find_signature(f0000_segment, sabi_config->test_string); + if (loca != 0xffff) + break; + } + + if (loca == 0xffff) { + pr_err("This computer does not support SABI\n"); + goto error_no_signature; + } + + /* point to the SMI port Number */ + loca += 1; + sabi = (f0000_segment + 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_config->header_offsets.port)); + printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n", + readb(sabi + sabi_config->header_offsets.iface_func)); + printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n", + readb(sabi + sabi_config->header_offsets.en_mem)); + printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n", + readb(sabi + sabi_config->header_offsets.re_mem)); + printk(KERN_DEBUG " SABI data offset = 0x%04x\n", + readw(sabi + sabi_config->header_offsets.data_offset)); + printk(KERN_DEBUG " SABI data segment = 0x%04x\n", + readw(sabi + sabi_config->header_offsets.data_segment)); + } + + /* Get a pointer to the SABI Interface */ + ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4; + ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff; + sabi_iface = ioremap_nocache(ifaceP, 16); + if (!sabi_iface) { + pr_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(sabi_config->commands.get_brightness, + &sretval); + printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]); + } + + /* Turn on "Linux" mode in the BIOS */ + if (sabi_config->commands.set_linux != 0xff) { + retval = sabi_set_command(sabi_config->commands.set_linux, + 0x81); + if (retval) { + pr_warn("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.type = BACKLIGHT_PLATFORM; + props.max_brightness = sabi_config->max_brightness; + 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_performance_level); + 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 */ + if (sabi_config->commands.set_linux != 0xff) + sabi_set_command(sabi_config->commands.set_linux, 0x80); + + device_remove_file(&sdev->dev, &dev_attr_performance_level); + 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"); |