![Alan Jenkins](/assets/img/avatar_default.png)
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Acked-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>
438 lines
10 KiB
C
438 lines
10 KiB
C
/*
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* Driver for Dell laptop extras
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*
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* Copyright (c) Red Hat <mjg@redhat.com>
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*
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* Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
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* Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <linux/rfkill.h>
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#include <linux/power_supply.h>
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#include <linux/acpi.h>
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#include "../../firmware/dcdbas.h"
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#define BRIGHTNESS_TOKEN 0x7d
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/* This structure will be modified by the firmware when we enter
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* system management mode, hence the volatiles */
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struct calling_interface_buffer {
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u16 class;
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u16 select;
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volatile u32 input[4];
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volatile u32 output[4];
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} __packed;
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struct calling_interface_token {
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u16 tokenID;
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u16 location;
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union {
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u16 value;
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u16 stringlength;
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};
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};
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struct calling_interface_structure {
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struct dmi_header header;
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u16 cmdIOAddress;
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u8 cmdIOCode;
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u32 supportedCmds;
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struct calling_interface_token tokens[];
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} __packed;
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static int da_command_address;
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static int da_command_code;
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static int da_num_tokens;
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static struct calling_interface_token *da_tokens;
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static struct platform_driver platform_driver = {
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.driver = {
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.name = "dell-laptop",
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.owner = THIS_MODULE,
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}
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};
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static struct platform_device *platform_device;
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static struct backlight_device *dell_backlight_device;
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static struct rfkill *wifi_rfkill;
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static struct rfkill *bluetooth_rfkill;
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static struct rfkill *wwan_rfkill;
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static const struct dmi_system_id __initdata dell_device_table[] = {
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{
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.ident = "Dell laptop",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
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DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
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},
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},
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{ }
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};
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static void __init parse_da_table(const struct dmi_header *dm)
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{
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/* Final token is a terminator, so we don't want to copy it */
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int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
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struct calling_interface_structure *table =
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container_of(dm, struct calling_interface_structure, header);
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/* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
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6 bytes of entry */
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if (dm->length < 17)
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return;
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da_command_address = table->cmdIOAddress;
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da_command_code = table->cmdIOCode;
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da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
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sizeof(struct calling_interface_token),
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GFP_KERNEL);
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if (!da_tokens)
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return;
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memcpy(da_tokens+da_num_tokens, table->tokens,
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sizeof(struct calling_interface_token) * tokens);
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da_num_tokens += tokens;
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}
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static void __init find_tokens(const struct dmi_header *dm, void *dummy)
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{
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switch (dm->type) {
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case 0xd4: /* Indexed IO */
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break;
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case 0xd5: /* Protected Area Type 1 */
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break;
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case 0xd6: /* Protected Area Type 2 */
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break;
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case 0xda: /* Calling interface */
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parse_da_table(dm);
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break;
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}
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}
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static int find_token_location(int tokenid)
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{
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int i;
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for (i = 0; i < da_num_tokens; i++) {
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if (da_tokens[i].tokenID == tokenid)
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return da_tokens[i].location;
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}
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return -1;
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}
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static struct calling_interface_buffer *
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dell_send_request(struct calling_interface_buffer *buffer, int class,
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int select)
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{
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struct smi_cmd command;
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command.magic = SMI_CMD_MAGIC;
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command.command_address = da_command_address;
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command.command_code = da_command_code;
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command.ebx = virt_to_phys(buffer);
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command.ecx = 0x42534931;
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buffer->class = class;
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buffer->select = select;
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dcdbas_smi_request(&command);
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return buffer;
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}
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/* Derived from information in DellWirelessCtl.cpp:
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Class 17, select 11 is radio control. It returns an array of 32-bit values.
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result[0]: return code
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result[1]:
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Bit 0: Hardware switch supported
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Bit 1: Wifi locator supported
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Bit 2: Wifi is supported
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Bit 3: Bluetooth is supported
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Bit 4: WWAN is supported
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Bit 5: Wireless keyboard supported
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Bits 6-7: Reserved
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Bit 8: Wifi is installed
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Bit 9: Bluetooth is installed
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Bit 10: WWAN is installed
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Bits 11-15: Reserved
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Bit 16: Hardware switch is on
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Bit 17: Wifi is blocked
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Bit 18: Bluetooth is blocked
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Bit 19: WWAN is blocked
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Bits 20-31: Reserved
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result[2]: NVRAM size in bytes
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result[3]: NVRAM format version number
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*/
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static int dell_rfkill_set(void *data, bool blocked)
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{
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struct calling_interface_buffer buffer;
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int disable = blocked ? 1 : 0;
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unsigned long radio = (unsigned long)data;
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memset(&buffer, 0, sizeof(struct calling_interface_buffer));
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buffer.input[0] = (1 | (radio<<8) | (disable << 16));
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dell_send_request(&buffer, 17, 11);
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return 0;
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}
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static void dell_rfkill_query(struct rfkill *rfkill, void *data)
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{
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struct calling_interface_buffer buffer;
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int status;
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int bit = (unsigned long)data + 16;
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memset(&buffer, 0, sizeof(struct calling_interface_buffer));
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dell_send_request(&buffer, 17, 11);
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status = buffer.output[1];
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rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
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rfkill_set_hw_state(rfkill, !(status & BIT(16)));
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}
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static const struct rfkill_ops dell_rfkill_ops = {
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.set_block = dell_rfkill_set,
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.query = dell_rfkill_query,
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};
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static int __init dell_setup_rfkill(void)
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{
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struct calling_interface_buffer buffer;
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int status;
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int ret;
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memset(&buffer, 0, sizeof(struct calling_interface_buffer));
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dell_send_request(&buffer, 17, 11);
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status = buffer.output[1];
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if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
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wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
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RFKILL_TYPE_WLAN,
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&dell_rfkill_ops, (void *) 1);
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if (!wifi_rfkill) {
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ret = -ENOMEM;
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goto err_wifi;
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}
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ret = rfkill_register(wifi_rfkill);
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if (ret)
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goto err_wifi;
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}
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if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
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bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
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&platform_device->dev,
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RFKILL_TYPE_BLUETOOTH,
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&dell_rfkill_ops, (void *) 2);
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if (!bluetooth_rfkill) {
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ret = -ENOMEM;
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goto err_bluetooth;
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}
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ret = rfkill_register(bluetooth_rfkill);
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if (ret)
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goto err_bluetooth;
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}
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if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
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wwan_rfkill = rfkill_alloc("dell-wwan",
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&platform_device->dev,
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RFKILL_TYPE_WWAN,
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&dell_rfkill_ops, (void *) 3);
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if (!wwan_rfkill) {
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ret = -ENOMEM;
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goto err_wwan;
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}
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ret = rfkill_register(wwan_rfkill);
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if (ret)
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goto err_wwan;
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}
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return 0;
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err_wwan:
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rfkill_destroy(wwan_rfkill);
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if (bluetooth_rfkill)
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rfkill_unregister(bluetooth_rfkill);
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err_bluetooth:
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rfkill_destroy(bluetooth_rfkill);
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if (wifi_rfkill)
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rfkill_unregister(wifi_rfkill);
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err_wifi:
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rfkill_destroy(wifi_rfkill);
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return ret;
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}
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static void dell_cleanup_rfkill(void)
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{
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if (wifi_rfkill) {
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rfkill_unregister(wifi_rfkill);
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rfkill_destroy(wifi_rfkill);
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}
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if (bluetooth_rfkill) {
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rfkill_unregister(bluetooth_rfkill);
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rfkill_destroy(bluetooth_rfkill);
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}
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if (wwan_rfkill) {
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rfkill_unregister(wwan_rfkill);
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rfkill_destroy(wwan_rfkill);
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}
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}
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static int dell_send_intensity(struct backlight_device *bd)
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{
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struct calling_interface_buffer buffer;
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memset(&buffer, 0, sizeof(struct calling_interface_buffer));
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buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
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buffer.input[1] = bd->props.brightness;
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if (buffer.input[0] == -1)
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return -ENODEV;
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if (power_supply_is_system_supplied() > 0)
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dell_send_request(&buffer, 1, 2);
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else
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dell_send_request(&buffer, 1, 1);
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return 0;
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}
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static int dell_get_intensity(struct backlight_device *bd)
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{
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struct calling_interface_buffer buffer;
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memset(&buffer, 0, sizeof(struct calling_interface_buffer));
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buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
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if (buffer.input[0] == -1)
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return -ENODEV;
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if (power_supply_is_system_supplied() > 0)
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dell_send_request(&buffer, 0, 2);
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else
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dell_send_request(&buffer, 0, 1);
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return buffer.output[1];
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}
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static struct backlight_ops dell_ops = {
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.get_brightness = dell_get_intensity,
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.update_status = dell_send_intensity,
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};
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static int __init dell_init(void)
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{
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struct calling_interface_buffer buffer;
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int max_intensity = 0;
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int ret;
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if (!dmi_check_system(dell_device_table))
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return -ENODEV;
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dmi_walk(find_tokens, NULL);
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if (!da_tokens) {
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printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
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return -ENODEV;
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}
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ret = platform_driver_register(&platform_driver);
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if (ret)
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goto fail_platform_driver;
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platform_device = platform_device_alloc("dell-laptop", -1);
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if (!platform_device) {
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ret = -ENOMEM;
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goto fail_platform_device1;
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}
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ret = platform_device_add(platform_device);
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if (ret)
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goto fail_platform_device2;
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ret = dell_setup_rfkill();
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if (ret) {
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printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
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goto fail_rfkill;
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}
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#ifdef CONFIG_ACPI
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/* In the event of an ACPI backlight being available, don't
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* register the platform controller.
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*/
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if (acpi_video_backlight_support())
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return 0;
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#endif
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memset(&buffer, 0, sizeof(struct calling_interface_buffer));
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buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
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if (buffer.input[0] != -1) {
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dell_send_request(&buffer, 0, 2);
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max_intensity = buffer.output[3];
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}
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if (max_intensity) {
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dell_backlight_device = backlight_device_register(
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"dell_backlight",
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&platform_device->dev, NULL,
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&dell_ops);
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if (IS_ERR(dell_backlight_device)) {
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ret = PTR_ERR(dell_backlight_device);
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dell_backlight_device = NULL;
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goto fail_backlight;
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}
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dell_backlight_device->props.max_brightness = max_intensity;
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dell_backlight_device->props.brightness =
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dell_get_intensity(dell_backlight_device);
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backlight_update_status(dell_backlight_device);
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}
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return 0;
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fail_backlight:
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dell_cleanup_rfkill();
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fail_rfkill:
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platform_device_del(platform_device);
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fail_platform_device2:
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platform_device_put(platform_device);
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fail_platform_device1:
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platform_driver_unregister(&platform_driver);
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fail_platform_driver:
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kfree(da_tokens);
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return ret;
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}
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static void __exit dell_exit(void)
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{
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backlight_device_unregister(dell_backlight_device);
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dell_cleanup_rfkill();
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}
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module_init(dell_init);
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module_exit(dell_exit);
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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MODULE_DESCRIPTION("Dell laptop driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
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