/* * Driver for Dell laptop extras * * Copyright (c) Red Hat * * Based on documentation in the libsmbios package, Copyright (C) 2005 Dell * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "../../firmware/dcdbas.h" #define BRIGHTNESS_TOKEN 0x7d /* This structure will be modified by the firmware when we enter * system management mode, hence the volatiles */ struct calling_interface_buffer { u16 class; u16 select; volatile u32 input[4]; volatile u32 output[4]; } __packed; struct calling_interface_token { u16 tokenID; u16 location; union { u16 value; u16 stringlength; }; }; struct calling_interface_structure { struct dmi_header header; u16 cmdIOAddress; u8 cmdIOCode; u32 supportedCmds; struct calling_interface_token tokens[]; } __packed; struct quirk_entry { u8 touchpad_led; }; static struct quirk_entry *quirks; static struct quirk_entry quirk_dell_vostro_v130 = { .touchpad_led = 1, }; static int __init dmi_matched(const struct dmi_system_id *dmi) { quirks = dmi->driver_data; return 1; } static int da_command_address; static int da_command_code; static int da_num_tokens; static struct calling_interface_token *da_tokens; static struct platform_driver platform_driver = { .driver = { .name = "dell-laptop", .owner = THIS_MODULE, } }; static struct platform_device *platform_device; static struct backlight_device *dell_backlight_device; static struct rfkill *wifi_rfkill; static struct rfkill *bluetooth_rfkill; static struct rfkill *wwan_rfkill; static bool force_rfkill; module_param(force_rfkill, bool, 0444); MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models"); static const struct dmi_system_id dell_device_table[] __initconst = { { .ident = "Dell laptop", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_CHASSIS_TYPE, "8"), }, }, { .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/ }, }, { .ident = "Dell Computer Corporation", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), DMI_MATCH(DMI_CHASSIS_TYPE, "8"), }, }, { } }; MODULE_DEVICE_TABLE(dmi, dell_device_table); static const struct dmi_system_id dell_quirks[] __initconst = { { .callback = dmi_matched, .ident = "Dell Vostro V130", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro V131", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro 3350", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro 3555", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron N311z", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron M5110", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro 3360", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro 3460", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro 3560", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Vostro 3450", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron 5420", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron 5520", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron 5720", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron 7420", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron 7520", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"), }, .driver_data = &quirk_dell_vostro_v130, }, { .callback = dmi_matched, .ident = "Dell Inspiron 7720", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"), }, .driver_data = &quirk_dell_vostro_v130, }, { } }; static struct calling_interface_buffer *buffer; static DEFINE_MUTEX(buffer_mutex); static int hwswitch_state; static void get_buffer(void) { mutex_lock(&buffer_mutex); memset(buffer, 0, sizeof(struct calling_interface_buffer)); } static void release_buffer(void) { mutex_unlock(&buffer_mutex); } static void __init parse_da_table(const struct dmi_header *dm) { /* Final token is a terminator, so we don't want to copy it */ int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1; struct calling_interface_token *new_da_tokens; struct calling_interface_structure *table = container_of(dm, struct calling_interface_structure, header); /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least 6 bytes of entry */ if (dm->length < 17) return; da_command_address = table->cmdIOAddress; da_command_code = table->cmdIOCode; new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) * sizeof(struct calling_interface_token), GFP_KERNEL); if (!new_da_tokens) return; da_tokens = new_da_tokens; memcpy(da_tokens+da_num_tokens, table->tokens, sizeof(struct calling_interface_token) * tokens); da_num_tokens += tokens; } static void __init find_tokens(const struct dmi_header *dm, void *dummy) { switch (dm->type) { case 0xd4: /* Indexed IO */ case 0xd5: /* Protected Area Type 1 */ case 0xd6: /* Protected Area Type 2 */ break; case 0xda: /* Calling interface */ parse_da_table(dm); break; } } static int find_token_location(int tokenid) { int i; for (i = 0; i < da_num_tokens; i++) { if (da_tokens[i].tokenID == tokenid) return da_tokens[i].location; } return -1; } static struct calling_interface_buffer * dell_send_request(struct calling_interface_buffer *buffer, int class, int select) { struct smi_cmd command; command.magic = SMI_CMD_MAGIC; command.command_address = da_command_address; command.command_code = da_command_code; command.ebx = virt_to_phys(buffer); command.ecx = 0x42534931; buffer->class = class; buffer->select = select; dcdbas_smi_request(&command); return buffer; } /* Derived from information in DellWirelessCtl.cpp: Class 17, select 11 is radio control. It returns an array of 32-bit values. Input byte 0 = 0: Wireless information result[0]: return code result[1]: Bit 0: Hardware switch supported Bit 1: Wifi locator supported Bit 2: Wifi is supported Bit 3: Bluetooth is supported Bit 4: WWAN is supported Bit 5: Wireless keyboard supported Bits 6-7: Reserved Bit 8: Wifi is installed Bit 9: Bluetooth is installed Bit 10: WWAN is installed Bits 11-15: Reserved Bit 16: Hardware switch is on Bit 17: Wifi is blocked Bit 18: Bluetooth is blocked Bit 19: WWAN is blocked Bits 20-31: Reserved result[2]: NVRAM size in bytes result[3]: NVRAM format version number Input byte 0 = 2: Wireless switch configuration result[0]: return code result[1]: Bit 0: Wifi controlled by switch Bit 1: Bluetooth controlled by switch Bit 2: WWAN controlled by switch Bits 3-6: Reserved Bit 7: Wireless switch config locked Bit 8: Wifi locator enabled Bits 9-14: Reserved Bit 15: Wifi locator setting locked Bits 16-31: Reserved */ static int dell_rfkill_set(void *data, bool blocked) { int disable = blocked ? 1 : 0; unsigned long radio = (unsigned long)data; int hwswitch_bit = (unsigned long)data - 1; get_buffer(); dell_send_request(buffer, 17, 11); /* If the hardware switch controls this radio, and the hardware switch is disabled, always disable the radio */ if ((hwswitch_state & BIT(hwswitch_bit)) && !(buffer->output[1] & BIT(16))) disable = 1; buffer->input[0] = (1 | (radio<<8) | (disable << 16)); dell_send_request(buffer, 17, 11); release_buffer(); return 0; } /* Must be called with the buffer held */ static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio, int status) { if (status & BIT(0)) { /* Has hw-switch, sync sw_state to BIOS */ int block = rfkill_blocked(rfkill); buffer->input[0] = (1 | (radio << 8) | (block << 16)); dell_send_request(buffer, 17, 11); } else { /* No hw-switch, sync BIOS state to sw_state */ rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16))); } } static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio, int status) { if (hwswitch_state & (BIT(radio - 1))) rfkill_set_hw_state(rfkill, !(status & BIT(16))); } static void dell_rfkill_query(struct rfkill *rfkill, void *data) { int status; get_buffer(); dell_send_request(buffer, 17, 11); status = buffer->output[1]; dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status); release_buffer(); } static const struct rfkill_ops dell_rfkill_ops = { .set_block = dell_rfkill_set, .query = dell_rfkill_query, }; static struct dentry *dell_laptop_dir; static int dell_debugfs_show(struct seq_file *s, void *data) { int status; get_buffer(); dell_send_request(buffer, 17, 11); status = buffer->output[1]; release_buffer(); seq_printf(s, "status:\t0x%X\n", status); seq_printf(s, "Bit 0 : Hardware switch supported: %lu\n", status & BIT(0)); seq_printf(s, "Bit 1 : Wifi locator supported: %lu\n", (status & BIT(1)) >> 1); seq_printf(s, "Bit 2 : Wifi is supported: %lu\n", (status & BIT(2)) >> 2); seq_printf(s, "Bit 3 : Bluetooth is supported: %lu\n", (status & BIT(3)) >> 3); seq_printf(s, "Bit 4 : WWAN is supported: %lu\n", (status & BIT(4)) >> 4); seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n", (status & BIT(5)) >> 5); seq_printf(s, "Bit 8 : Wifi is installed: %lu\n", (status & BIT(8)) >> 8); seq_printf(s, "Bit 9 : Bluetooth is installed: %lu\n", (status & BIT(9)) >> 9); seq_printf(s, "Bit 10: WWAN is installed: %lu\n", (status & BIT(10)) >> 10); seq_printf(s, "Bit 16: Hardware switch is on: %lu\n", (status & BIT(16)) >> 16); seq_printf(s, "Bit 17: Wifi is blocked: %lu\n", (status & BIT(17)) >> 17); seq_printf(s, "Bit 18: Bluetooth is blocked: %lu\n", (status & BIT(18)) >> 18); seq_printf(s, "Bit 19: WWAN is blocked: %lu\n", (status & BIT(19)) >> 19); seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state); seq_printf(s, "Bit 0 : Wifi controlled by switch: %lu\n", hwswitch_state & BIT(0)); seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n", (hwswitch_state & BIT(1)) >> 1); seq_printf(s, "Bit 2 : WWAN controlled by switch: %lu\n", (hwswitch_state & BIT(2)) >> 2); seq_printf(s, "Bit 7 : Wireless switch config locked: %lu\n", (hwswitch_state & BIT(7)) >> 7); seq_printf(s, "Bit 8 : Wifi locator enabled: %lu\n", (hwswitch_state & BIT(8)) >> 8); seq_printf(s, "Bit 15: Wifi locator setting locked: %lu\n", (hwswitch_state & BIT(15)) >> 15); return 0; } static int dell_debugfs_open(struct inode *inode, struct file *file) { return single_open(file, dell_debugfs_show, inode->i_private); } static const struct file_operations dell_debugfs_fops = { .owner = THIS_MODULE, .open = dell_debugfs_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void dell_update_rfkill(struct work_struct *ignored) { int status; get_buffer(); dell_send_request(buffer, 17, 11); status = buffer->output[1]; if (wifi_rfkill) { dell_rfkill_update_hw_state(wifi_rfkill, 1, status); dell_rfkill_update_sw_state(wifi_rfkill, 1, status); } if (bluetooth_rfkill) { dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status); dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status); } if (wwan_rfkill) { dell_rfkill_update_hw_state(wwan_rfkill, 3, status); dell_rfkill_update_sw_state(wwan_rfkill, 3, status); } release_buffer(); } static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill); static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str, struct serio *port) { static bool extended; if (str & 0x20) return false; if (unlikely(data == 0xe0)) { extended = true; return false; } else if (unlikely(extended)) { switch (data) { case 0x8: schedule_delayed_work(&dell_rfkill_work, round_jiffies_relative(HZ / 4)); break; } extended = false; } return false; } static int __init dell_setup_rfkill(void) { int status, ret, whitelisted; const char *product; /* * rfkill support causes trouble on various models, mostly Inspirons. * So we whitelist certain series, and don't support rfkill on others. */ whitelisted = 0; product = dmi_get_system_info(DMI_PRODUCT_NAME); if (product && (strncmp(product, "Latitude", 8) == 0 || strncmp(product, "Precision", 9) == 0)) whitelisted = 1; if (!force_rfkill && !whitelisted) return 0; get_buffer(); dell_send_request(buffer, 17, 11); status = buffer->output[1]; buffer->input[0] = 0x2; dell_send_request(buffer, 17, 11); hwswitch_state = buffer->output[1]; release_buffer(); if (!(status & BIT(0))) { if (force_rfkill) { /* No hwsitch, clear all hw-controlled bits */ hwswitch_state &= ~7; } else { /* rfkill is only tested on laptops with a hwswitch */ return 0; } } if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) { wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev, RFKILL_TYPE_WLAN, &dell_rfkill_ops, (void *) 1); if (!wifi_rfkill) { ret = -ENOMEM; goto err_wifi; } ret = rfkill_register(wifi_rfkill); if (ret) goto err_wifi; } if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) { bluetooth_rfkill = rfkill_alloc("dell-bluetooth", &platform_device->dev, RFKILL_TYPE_BLUETOOTH, &dell_rfkill_ops, (void *) 2); if (!bluetooth_rfkill) { ret = -ENOMEM; goto err_bluetooth; } ret = rfkill_register(bluetooth_rfkill); if (ret) goto err_bluetooth; } if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) { wwan_rfkill = rfkill_alloc("dell-wwan", &platform_device->dev, RFKILL_TYPE_WWAN, &dell_rfkill_ops, (void *) 3); if (!wwan_rfkill) { ret = -ENOMEM; goto err_wwan; } ret = rfkill_register(wwan_rfkill); if (ret) goto err_wwan; } ret = i8042_install_filter(dell_laptop_i8042_filter); if (ret) { pr_warn("Unable to install key filter\n"); goto err_filter; } return 0; err_filter: if (wwan_rfkill) rfkill_unregister(wwan_rfkill); err_wwan: rfkill_destroy(wwan_rfkill); if (bluetooth_rfkill) rfkill_unregister(bluetooth_rfkill); err_bluetooth: rfkill_destroy(bluetooth_rfkill); if (wifi_rfkill) rfkill_unregister(wifi_rfkill); err_wifi: rfkill_destroy(wifi_rfkill); return ret; } static void dell_cleanup_rfkill(void) { if (wifi_rfkill) { rfkill_unregister(wifi_rfkill); rfkill_destroy(wifi_rfkill); } if (bluetooth_rfkill) { rfkill_unregister(bluetooth_rfkill); rfkill_destroy(bluetooth_rfkill); } if (wwan_rfkill) { rfkill_unregister(wwan_rfkill); rfkill_destroy(wwan_rfkill); } } static int dell_send_intensity(struct backlight_device *bd) { int ret = 0; get_buffer(); buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN); buffer->input[1] = bd->props.brightness; if (buffer->input[0] == -1) { ret = -ENODEV; goto out; } if (power_supply_is_system_supplied() > 0) dell_send_request(buffer, 1, 2); else dell_send_request(buffer, 1, 1); out: release_buffer(); return ret; } static int dell_get_intensity(struct backlight_device *bd) { int ret = 0; get_buffer(); buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN); if (buffer->input[0] == -1) { ret = -ENODEV; goto out; } if (power_supply_is_system_supplied() > 0) dell_send_request(buffer, 0, 2); else dell_send_request(buffer, 0, 1); ret = buffer->output[1]; out: release_buffer(); return ret; } static const struct backlight_ops dell_ops = { .get_brightness = dell_get_intensity, .update_status = dell_send_intensity, }; static void touchpad_led_on(void) { int command = 0x97; char data = 1; i8042_command(&data, command | 1 << 12); } static void touchpad_led_off(void) { int command = 0x97; char data = 2; i8042_command(&data, command | 1 << 12); } static void touchpad_led_set(struct led_classdev *led_cdev, enum led_brightness value) { if (value > 0) touchpad_led_on(); else touchpad_led_off(); } static struct led_classdev touchpad_led = { .name = "dell-laptop::touchpad", .brightness_set = touchpad_led_set, .flags = LED_CORE_SUSPENDRESUME, }; static int __init touchpad_led_init(struct device *dev) { return led_classdev_register(dev, &touchpad_led); } static void touchpad_led_exit(void) { led_classdev_unregister(&touchpad_led); } static int __init dell_init(void) { int max_intensity = 0; int ret; if (!dmi_check_system(dell_device_table)) return -ENODEV; quirks = NULL; /* find if this machine support other functions */ dmi_check_system(dell_quirks); dmi_walk(find_tokens, NULL); if (!da_tokens) { pr_info("Unable to find dmi tokens\n"); return -ENODEV; } ret = platform_driver_register(&platform_driver); if (ret) goto fail_platform_driver; platform_device = platform_device_alloc("dell-laptop", -1); if (!platform_device) { ret = -ENOMEM; goto fail_platform_device1; } ret = platform_device_add(platform_device); if (ret) goto fail_platform_device2; /* * Allocate buffer below 4GB for SMI data--only 32-bit physical addr * is passed to SMI handler. */ buffer = (void *)__get_free_page(GFP_KERNEL | GFP_DMA32); if (!buffer) { ret = -ENOMEM; goto fail_buffer; } ret = dell_setup_rfkill(); if (ret) { pr_warn("Unable to setup rfkill\n"); goto fail_rfkill; } if (quirks && quirks->touchpad_led) touchpad_led_init(&platform_device->dev); dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL); if (dell_laptop_dir != NULL) debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL, &dell_debugfs_fops); #ifdef CONFIG_ACPI /* In the event of an ACPI backlight being available, don't * register the platform controller. */ if (acpi_video_backlight_support()) return 0; #endif get_buffer(); buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN); if (buffer->input[0] != -1) { dell_send_request(buffer, 0, 2); max_intensity = buffer->output[3]; } release_buffer(); if (max_intensity) { struct backlight_properties props; memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_PLATFORM; props.max_brightness = max_intensity; dell_backlight_device = backlight_device_register("dell_backlight", &platform_device->dev, NULL, &dell_ops, &props); if (IS_ERR(dell_backlight_device)) { ret = PTR_ERR(dell_backlight_device); dell_backlight_device = NULL; goto fail_backlight; } dell_backlight_device->props.brightness = dell_get_intensity(dell_backlight_device); backlight_update_status(dell_backlight_device); } return 0; fail_backlight: i8042_remove_filter(dell_laptop_i8042_filter); cancel_delayed_work_sync(&dell_rfkill_work); dell_cleanup_rfkill(); fail_rfkill: free_page((unsigned long)buffer); fail_buffer: platform_device_del(platform_device); fail_platform_device2: platform_device_put(platform_device); fail_platform_device1: platform_driver_unregister(&platform_driver); fail_platform_driver: kfree(da_tokens); return ret; } static void __exit dell_exit(void) { debugfs_remove_recursive(dell_laptop_dir); if (quirks && quirks->touchpad_led) touchpad_led_exit(); i8042_remove_filter(dell_laptop_i8042_filter); cancel_delayed_work_sync(&dell_rfkill_work); backlight_device_unregister(dell_backlight_device); dell_cleanup_rfkill(); if (platform_device) { platform_device_unregister(platform_device); platform_driver_unregister(&platform_driver); } kfree(da_tokens); free_page((unsigned long)buffer); } module_init(dell_init); module_exit(dell_exit); MODULE_AUTHOR("Matthew Garrett "); MODULE_DESCRIPTION("Dell laptop driver"); MODULE_LICENSE("GPL");