diff options
Diffstat (limited to 'drivers/misc/dell-laptop.c')
| -rw-r--r-- | drivers/misc/dell-laptop.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/drivers/misc/dell-laptop.c b/drivers/misc/dell-laptop.c new file mode 100644 index 0000000..4d33a20 --- /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:*"); |
