diff --git a/MAINTAINERS b/MAINTAINERS
index a01884407fe45065b99891c82909dca5b5094564..4bb5d4be81058d84306735c0f0961d7668af41c8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1360,6 +1360,11 @@ P: Maciej W. Rozycki
M: macro@linux-mips.org
S: Maintained
+DELL LAPTOP DRIVER
+P: Matthew Garrett
+M: mjg59@srcf.ucam.org
+S: Maintained
+
DELL LAPTOP SMM DRIVER
P: Massimo Dal Zotto
M: dz@debian.org
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index fee7304102af8158ca3882bccb854f0f6fcb2bbe..3949a1c7345136048fac097a8e90eddf24e476d9 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -498,6 +498,18 @@ config SGI_GRU_DEBUG
This option enables addition debugging code for the SGI GRU driver. If
you are unsure, say N.
+config DELL_LAPTOP
+ tristate "Dell Laptop Extras (EXPERIMENTAL)"
+ depends on X86
+ depends on DCDBAS
+ depends on EXPERIMENTAL
+ depends on BACKLIGHT_CLASS_DEVICE
+ depends on RFKILL
+ default n
+ ---help---
+ This driver adds support for rfkill and backlight control to Dell
+ laptops.
+
source "drivers/misc/c2port/Kconfig"
endif # MISC_DEVICES
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 817f7f5ab3bd2c21476033c195dbba93bf58d05b..5de863a0e3956dae444215549e770bdb9a2049bc 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_ICS932S401) += ics932s401.o
obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o
obj-$(CONFIG_LKDTM) += lkdtm.o
obj-$(CONFIG_TIFM_CORE) += tifm_core.o
+obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o
obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o
obj-$(CONFIG_PHANTOM) += phantom.o
obj-$(CONFIG_SGI_IOC4) += ioc4.o
diff --git a/drivers/misc/dell-laptop.c b/drivers/misc/dell-laptop.c
new file mode 100644
index 0000000000000000000000000000000000000000..4d33a2068b7a76ec5738d0162a2816a92e4d1c88
--- /dev/null
+++ b/drivers/misc/dell-laptop.c
@@ -0,0 +1,436 @@
+/*
+ * Driver for Dell laptop extras
+ *
+ * Copyright (c) Red Hat <mjg@redhat.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/dmi.h>
+#include <linux/io.h>
+#include <linux/rfkill.h>
+#include <linux/power_supply.h>
+#include <linux/acpi.h>
+#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;
+
+static int da_command_address;
+static int da_command_code;
+static int da_num_tokens;
+static struct calling_interface_token *da_tokens;
+
+static struct backlight_device *dell_backlight_device;
+static struct rfkill *wifi_rfkill;
+static struct rfkill *bluetooth_rfkill;
+static struct rfkill *wwan_rfkill;
+
+static const struct dmi_system_id __initdata dell_device_table[] = {
+ {
+ .ident = "Dell laptop",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+ DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
+ },
+ },
+ { }
+};
+
+static void 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_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;
+
+ da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
+ sizeof(struct calling_interface_token),
+ GFP_KERNEL);
+
+ if (!da_tokens)
+ return;
+
+ memcpy(da_tokens+da_num_tokens, table->tokens,
+ sizeof(struct calling_interface_token) * tokens);
+
+ da_num_tokens += tokens;
+}
+
+static void find_tokens(const struct dmi_header *dm)
+{
+ switch (dm->type) {
+ case 0xd4: /* Indexed IO */
+ break;
+ case 0xd5: /* Protected Area Type 1 */
+ break;
+ 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.
+
+ 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
+*/
+
+static int dell_rfkill_set(int radio, enum rfkill_state state)
+{
+ struct calling_interface_buffer buffer;
+ int disable = (state == RFKILL_STATE_UNBLOCKED) ? 0 : 1;
+
+ memset(&buffer, 0, sizeof(struct calling_interface_buffer));
+ buffer.input[0] = (1 | (radio<<8) | (disable << 16));
+ dell_send_request(&buffer, 17, 11);
+
+ return 0;
+}
+
+static int dell_wifi_set(void *data, enum rfkill_state state)
+{
+ return dell_rfkill_set(1, state);
+}
+
+static int dell_bluetooth_set(void *data, enum rfkill_state state)
+{
+ return dell_rfkill_set(2, state);
+}
+
+static int dell_wwan_set(void *data, enum rfkill_state state)
+{
+ return dell_rfkill_set(3, state);
+}
+
+static int dell_rfkill_get(int bit, enum rfkill_state *state)
+{
+ struct calling_interface_buffer buffer;
+ int status;
+ int new_state = RFKILL_STATE_HARD_BLOCKED;
+
+ memset(&buffer, 0, sizeof(struct calling_interface_buffer));
+ dell_send_request(&buffer, 17, 11);
+ status = buffer.output[1];
+
+ if (status & (1<<16))
+ new_state = RFKILL_STATE_SOFT_BLOCKED;
+
+ if (status & (1<<bit))
+ *state = new_state;
+ else
+ *state = RFKILL_STATE_UNBLOCKED;
+
+ return 0;
+}
+
+static int dell_wifi_get(void *data, enum rfkill_state *state)
+{
+ return dell_rfkill_get(17, state);
+}
+
+static int dell_bluetooth_get(void *data, enum rfkill_state *state)
+{
+ return dell_rfkill_get(18, state);
+}
+
+static int dell_wwan_get(void *data, enum rfkill_state *state)
+{
+ return dell_rfkill_get(19, state);
+}
+
+static int dell_setup_rfkill(void)
+{
+ struct calling_interface_buffer buffer;
+ int status;
+ int ret;
+
+ memset(&buffer, 0, sizeof(struct calling_interface_buffer));
+ dell_send_request(&buffer, 17, 11);
+ status = buffer.output[1];
+
+ if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
+ wifi_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WLAN);
+ if (!wifi_rfkill)
+ goto err_wifi;
+ wifi_rfkill->name = "dell-wifi";
+ wifi_rfkill->toggle_radio = dell_wifi_set;
+ wifi_rfkill->get_state = dell_wifi_get;
+ ret = rfkill_register(wifi_rfkill);
+ if (ret)
+ goto err_wifi;
+ }
+
+ if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
+ bluetooth_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_BLUETOOTH);
+ if (!bluetooth_rfkill)
+ goto err_bluetooth;
+ bluetooth_rfkill->name = "dell-bluetooth";
+ bluetooth_rfkill->toggle_radio = dell_bluetooth_set;
+ bluetooth_rfkill->get_state = dell_bluetooth_get;
+ ret = rfkill_register(bluetooth_rfkill);
+ if (ret)
+ goto err_bluetooth;
+ }
+
+ if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
+ wwan_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WWAN);
+ if (!wwan_rfkill)
+ goto err_wwan;
+ wwan_rfkill->name = "dell-wwan";
+ wwan_rfkill->toggle_radio = dell_wwan_set;
+ wwan_rfkill->get_state = dell_wwan_get;
+ ret = rfkill_register(wwan_rfkill);
+ if (ret)
+ goto err_wwan;
+ }
+
+ return 0;
+err_wwan:
+ if (wwan_rfkill)
+ rfkill_free(wwan_rfkill);
+ if (bluetooth_rfkill) {
+ rfkill_unregister(bluetooth_rfkill);
+ bluetooth_rfkill = NULL;
+ }
+err_bluetooth:
+ if (bluetooth_rfkill)
+ rfkill_free(bluetooth_rfkill);
+ if (wifi_rfkill) {
+ rfkill_unregister(wifi_rfkill);
+ wifi_rfkill = NULL;
+ }
+err_wifi:
+ if (wifi_rfkill)
+ rfkill_free(wifi_rfkill);
+
+ return ret;
+}
+
+static int dell_send_intensity(struct backlight_device *bd)
+{
+ struct calling_interface_buffer buffer;
+
+ memset(&buffer, 0, sizeof(struct calling_interface_buffer));
+ buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
+ buffer.input[1] = bd->props.brightness;
+
+ if (buffer.input[0] == -1)
+ return -ENODEV;
+
+ if (power_supply_is_system_supplied() > 0)
+ dell_send_request(&buffer, 1, 2);
+ else
+ dell_send_request(&buffer, 1, 1);
+
+ return 0;
+}
+
+static int dell_get_intensity(struct backlight_device *bd)
+{
+ struct calling_interface_buffer buffer;
+
+ memset(&buffer, 0, sizeof(struct calling_interface_buffer));
+ buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
+
+ if (buffer.input[0] == -1)
+ return -ENODEV;
+
+ if (power_supply_is_system_supplied() > 0)
+ dell_send_request(&buffer, 0, 2);
+ else
+ dell_send_request(&buffer, 0, 1);
+
+ return buffer.output[1];
+}
+
+static struct backlight_ops dell_ops = {
+ .get_brightness = dell_get_intensity,
+ .update_status = dell_send_intensity,
+};
+
+static int __init dell_init(void)
+{
+ struct calling_interface_buffer buffer;
+ int max_intensity = 0;
+ int ret;
+
+ if (!dmi_check_system(dell_device_table))
+ return -ENODEV;
+
+ dmi_walk(find_tokens);
+
+ if (!da_tokens) {
+ printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
+ return -ENODEV;
+ }
+
+ ret = dell_setup_rfkill();
+
+ if (ret) {
+ printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
+ goto out;
+ }
+
+#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
+
+ memset(&buffer, 0, sizeof(struct calling_interface_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];
+ }
+
+ if (max_intensity) {
+ dell_backlight_device = backlight_device_register(
+ "dell_backlight",
+ NULL, NULL,
+ &dell_ops);
+
+ if (IS_ERR(dell_backlight_device)) {
+ ret = PTR_ERR(dell_backlight_device);
+ dell_backlight_device = NULL;
+ goto out;
+ }
+
+ dell_backlight_device->props.max_brightness = max_intensity;
+ dell_backlight_device->props.brightness =
+ dell_get_intensity(dell_backlight_device);
+ backlight_update_status(dell_backlight_device);
+ }
+
+ return 0;
+out:
+ if (wifi_rfkill)
+ rfkill_unregister(wifi_rfkill);
+ if (bluetooth_rfkill)
+ rfkill_unregister(bluetooth_rfkill);
+ if (wwan_rfkill)
+ rfkill_unregister(wwan_rfkill);
+ kfree(da_tokens);
+ return ret;
+}
+
+static void __exit dell_exit(void)
+{
+ backlight_device_unregister(dell_backlight_device);
+ if (wifi_rfkill)
+ rfkill_unregister(wifi_rfkill);
+ if (bluetooth_rfkill)
+ rfkill_unregister(bluetooth_rfkill);
+ if (wwan_rfkill)
+ rfkill_unregister(wwan_rfkill);
+}
+
+module_init(dell_init);
+module_exit(dell_exit);
+
+MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
+MODULE_DESCRIPTION("Dell laptop driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");