/* * 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. */ #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; 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, void *dummy) { 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(void *data, bool blocked) { struct calling_interface_buffer buffer; int disable = blocked ? 1 : 0; unsigned long radio = (unsigned long)data; 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 void dell_rfkill_query(struct rfkill *rfkill, void *data) { struct calling_interface_buffer buffer; int status; int bit = (unsigned long)data + 16; memset(&buffer, 0, sizeof(struct calling_interface_buffer)); dell_send_request(&buffer, 17, 11); status = buffer.output[1]; rfkill_set_sw_state(rfkill, !!(status & BIT(bit))); rfkill_set_hw_state(rfkill, !(status & BIT(16))); } static const struct rfkill_ops dell_rfkill_ops = { .set_block = dell_rfkill_set, .query = dell_rfkill_query, }; 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_alloc("dell-wifi", NULL, 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", NULL, 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", NULL, 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; } return 0; 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 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, NULL); 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 fail_rfkill; } #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 fail_backlight; } 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; fail_backlight: if (wifi_rfkill) rfkill_unregister(wifi_rfkill); if (bluetooth_rfkill) rfkill_unregister(bluetooth_rfkill); if (wwan_rfkill) rfkill_unregister(wwan_rfkill); fail_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 "); MODULE_DESCRIPTION("Dell laptop driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");