TC1100 WMI driver
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Summary
This is a driver for brightness control and WiFi power management functions of the HP/Compaq TC1100 Tablet PC. See TC1100 for installation instructions.
Source listing
/*
* wmi.c - ACPI Windows Management Interface Driver ($Revision: 1.1 $)
*
* Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <acpi/acpi.h>
#include <acpi/actypes.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <asm/uaccess.h>
#define WMI_COMPONENT 0x40000000
#define WMI_CLASS "wmi"
#define WMI_HID "PNP0C14"
#define WMI_DRIVER_NAME "ACPI WMI Driver"
#define WMI_DEVICE_NAME "Windows Management Interface"
#define WMI_FILE_STATE "state"
#define WMI_FILE_WLAN "wlan"
#define WMI_FILE_BLUETOOTH "bluetooth"
#define WMI_NOTIFY_STATUS 0x80
#define WMI_STATUS_OFFLINE 0x0D
#define WMI_STATUS_ONLINE 0x0F
#define WMI_STATUS_UNKNOWN 0xFF
#define _COMPONENT WMI_COMPONENT
ACPI_MODULE_NAME ("wmi")
MODULE_AUTHOR("Jamey Hicks");
MODULE_DESCRIPTION(WMI_DRIVER_NAME);
MODULE_LICENSE("GPL");
int wmi_add (struct acpi_device *device);
int wmi_remove (struct acpi_device *device, int type);
static int wmi_start (struct acpi_device *device);
static int wmi_stop (struct acpi_device *device, int type);
static int wmi_open_fs(struct inode *inode, struct file *file);
static struct acpi_driver wmi_driver = {
.name = WMI_DRIVER_NAME,
.class = WMI_CLASS,
.ids = WMI_HID,
.ops = {
.add = wmi_add,
.remove = wmi_remove,
.start = wmi_start,
.stop = wmi_stop,
},
};
struct wmi {
acpi_handle handle;
unsigned long wlan;
unsigned long bluetooth;
unsigned long state[3];
};
static int wmi_set_state (struct wmi *wmi);
static struct file_operations wmi_fops = {
.open = wmi_open_fs,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* --------------------------------------------------------------------------
WMI Management
-------------------------------------------------------------------------- */
static int
wmi_get_state (
struct wmi *wmi)
{
acpi_status status = AE_OK;
union acpi_object params_objects[2];
struct acpi_object_list params;
int i;
ACPI_FUNCTION_TRACE("wmi_get_state");
if (!wmi)
return_VALUE(-EINVAL);
for (i = 0; i < 3; i++) {
params.count = 1;
params.pointer = params_objects;
params_objects[0].integer.type = ACPI_TYPE_INTEGER;
params_objects[0].integer.value = i;
printk("calling WQBA\n");
status = acpi_evaluate_integer(wmi->handle, "WQBA", ¶ms, &wmi->state[i]);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error reading WMI state\n"));
wmi->state[i] = WMI_STATUS_UNKNOWN;
return_VALUE(-ENODEV);
}
}
wmi->wlan = (wmi->state[1] == 3) ? 1 : 0;
wmi->bluetooth = (wmi->state[2] == 1) ? 1 : 0;
return_VALUE(0);
}
static int
wmi_set_state (struct wmi *wmi)
{
acpi_status status = AE_OK;
union acpi_object params_objects[2];
struct acpi_object_list params;
int val;
struct acpi_buffer ret;
ACPI_FUNCTION_TRACE("wmi_set_state");
printk("calling WSBA\n");
if (!wmi)
return_VALUE(-EINVAL);
printk("calling WSBA index=1 val=%ld\n", wmi->state[1]);
val = wmi->wlan ? 1 : 2;
params.count = 2;
params.pointer = params_objects;
params_objects[0].integer.type = ACPI_TYPE_INTEGER;
params_objects[0].integer.value = 1;
params_objects[1].integer.type = ACPI_TYPE_INTEGER;
params_objects[1].integer.value = val;
status = acpi_evaluate_object(wmi->handle, "WSBA", ¶ms, &ret);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error calling wsba state: status=%x\n", status));
}
printk("calling WSBA index=2 val=%ld\n", wmi->state[1]);
val = wmi->bluetooth ? 0 : 1;
params.count = 2;
params.pointer = params_objects;
params_objects[0].integer.type = ACPI_TYPE_INTEGER;
params_objects[0].integer.value = 2;
params_objects[1].integer.type = ACPI_TYPE_INTEGER;
params_objects[1].integer.value = val;
status = acpi_evaluate_object(wmi->handle, "WSBA", ¶ms, &ret);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error calling wsba state: status=%x\n", status));
}
return_VALUE(0);
}
/* --------------------------------------------------------------------------
FS Interface (/proc)
-------------------------------------------------------------------------- */
struct proc_dir_entry *wmi_dir;
int wmi_seq_show(struct seq_file *seq, void *offset)
{
struct wmi *wmi = (struct wmi *) seq->private;
int i;
ACPI_FUNCTION_TRACE("wmi_seq_show");
if (!wmi)
return 0;
if (wmi_get_state(wmi)) {
seq_puts(seq, "ERROR: Unable to read WMI state\n");
return 0;
}
seq_puts(seq, "state: ");
for (i = 0; i < 3; i++)
seq_printf(seq, " %ld", wmi->state[i]);
seq_puts(seq, "\n");
return 0;
}
static int wmi_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, wmi_seq_show, PDE(inode)->data);
}
static int
wlan_write_state (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *ppos)
{
struct seq_file *m = (struct seq_file *) file->private_data;
struct wmi *wmi = (struct wmi *) m->private;
char str[64];
int error = 0;
printk("wmi_write_state: wmi=%p\n", wmi);
if (count > sizeof(str) - 1)
goto Done;
memset(str,0,sizeof(str));
if (copy_from_user(str, buffer, count))
return -EFAULT;
if (strncmp(str, "on", 2) == 0) {
wmi->wlan = 1;
} else if (strncmp(str, "off", 3) == 0) {
wmi->wlan = 0;
} else {
wmi->wlan = simple_strtoul(str, NULL, 0);
}
error = wmi_set_state(wmi);
Done:
return error ? error : count;
}
int wlan_seq_show(struct seq_file *seq, void *offset)
{
struct wmi *wmi = (struct wmi *) seq->private;
ACPI_FUNCTION_TRACE("wlan_seq_show");
if (!wmi)
return 0;
if (wmi_get_state(wmi)) {
seq_puts(seq, "ERROR: Unable to read wmi state\n");
return 0;
}
seq_puts(seq, wmi->wlan ? "on\n" : "off\n");
return 0;
}
static int wlan_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, wlan_seq_show, PDE(inode)->data);
}
static struct file_operations wlan_fops = {
.open = wlan_open_fs,
.read = seq_read,
.write = wlan_write_state,
.llseek = seq_lseek,
.release = single_release,
};
static int
bluetooth_write_state (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *ppos)
{
struct seq_file *m = (struct seq_file *) file->private_data;
struct wmi *wmi = (struct wmi *) m->private;
char str[64];
int error = 0;
printk("wmi_write_state: wmi=%p\n", wmi);
if (count > sizeof(str) - 1)
goto Done;
memset(str,0,sizeof(str));
if (copy_from_user(str, buffer, count))
return -EFAULT;
if (strncmp(str, "on", 2) == 0) {
wmi->bluetooth = 1;
} else if (strncmp(str, "off", 3) == 0) {
wmi->bluetooth = 0;
} else {
wmi->bluetooth = simple_strtoul(str, NULL, 0);
}
error = wmi_set_state(wmi);
Done:
return error ? error : count;
}
int bluetooth_seq_show(struct seq_file *seq, void *offset)
{
struct wmi *wmi = (struct wmi *) seq->private;
ACPI_FUNCTION_TRACE("bluetooth_seq_show");
if (!wmi)
return 0;
if (wmi_get_state(wmi)) {
seq_puts(seq, "ERROR: Unable to read wmi state\n");
return 0;
}
seq_puts(seq, wmi->bluetooth ? "on\n" : "off\n");
return 0;
}
static int bluetooth_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, bluetooth_seq_show, PDE(inode)->data);
}
static struct file_operations bluetooth_fops = {
.open = bluetooth_open_fs,
.read = seq_read,
.write = bluetooth_write_state,
.llseek = seq_lseek,
.release = single_release,
};
static int
wmi_add_fs (
struct acpi_device *device)
{
struct proc_dir_entry *entry = NULL;
ACPI_FUNCTION_TRACE("wmi_add_fs");
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
wmi_dir);
if (!acpi_device_dir(device))
return_VALUE(-ENODEV);
}
/* 'state' [R] */
entry = create_proc_entry(WMI_FILE_STATE,
S_IRUGO, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
WMI_FILE_STATE));
else {
entry->proc_fops = &wmi_fops;
entry->data = acpi_driver_data(device);
}
entry = create_proc_entry(WMI_FILE_WLAN,
S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
WMI_FILE_STATE));
else {
entry->proc_fops = &wlan_fops;
entry->data = acpi_driver_data(device);
}
entry = create_proc_entry(WMI_FILE_BLUETOOTH,
S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
if (!entry)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to create '%s' fs entry\n",
WMI_FILE_STATE));
else {
entry->proc_fops = &bluetooth_fops;
entry->data = acpi_driver_data(device);
}
return_VALUE(0);
}
static int
wmi_remove_fs (
struct acpi_device *device)
{
ACPI_FUNCTION_TRACE("wmi_remove_fs");
if (acpi_device_dir(device)) {
remove_proc_entry(WMI_FILE_STATE, acpi_device_dir(device));
remove_proc_entry(WMI_FILE_WLAN, acpi_device_dir(device));
remove_proc_entry(WMI_FILE_BLUETOOTH, acpi_device_dir(device));
remove_proc_entry(acpi_device_bid(device), wmi_dir);
acpi_device_dir(device) = NULL;
}
return_VALUE(0);
}
/* --------------------------------------------------------------------------
Driver Model
-------------------------------------------------------------------------- */
void
wmi_notify (
acpi_handle handle,
u32 event,
void *data)
{
struct wmi *wmi = (struct wmi *) data;
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("wmi_notify");
if (!wmi)
return;
if (acpi_bus_get_device(wmi->handle, &device))
return_VOID;
switch (event) {
case WMI_NOTIFY_STATUS:
wmi_get_state(wmi);
acpi_bus_generate_event(device, event, (u32) wmi->state);
break;
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));
break;
}
return_VOID;
}
int
wmi_add (
struct acpi_device *device)
{
int result = 0;
struct wmi *wacom = NULL;
ACPI_FUNCTION_TRACE("wmi_add");
printk("wmi_add device=%p\n", device);
if (!device)
return_VALUE(-EINVAL);
wacom = kmalloc(sizeof(struct wmi), GFP_KERNEL);
if (!wacom)
return_VALUE(-ENOMEM);
memset(wacom, 0, sizeof(struct wmi));
wacom->handle = device->handle;
strcpy(acpi_device_name(device), WMI_DEVICE_NAME);
strcpy(acpi_device_class(device), WMI_CLASS);
acpi_driver_data(device) = wacom;
result = wmi_get_state(wacom);
if (result)
goto end;
result = wmi_add_fs(device);
if (result)
goto end;
#if 0
status = acpi_install_notify_handler(wmi->handle,
ACPI_DEVICE_NOTIFY, wmi_notify, ac);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Error installing notify handler\n"));
result = -ENODEV;
goto end;
}
#endif
printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
acpi_device_name(device), acpi_device_bid(device),
wacom->state?"on-line":"off-line");
end:
if (result) {
wmi_remove_fs(device);
kfree(wacom);
}
return_VALUE(result);
}
int
wmi_remove (
struct acpi_device *device,
int type)
{
struct wmi *wmi = NULL;
ACPI_FUNCTION_TRACE("wmi_remove");
if (!device || !acpi_driver_data(device))
return_VALUE(-EINVAL);
wmi = (struct wmi *) acpi_driver_data(device);
wmi_remove_fs(device);
kfree(wmi);
return_VALUE(0);
}
static int
wmi_start (
struct acpi_device *device)
{
struct wmi *wacom = NULL;
ACPI_FUNCTION_TRACE("wmi_start");
if (!device)
return_VALUE(-EINVAL);
wacom = acpi_driver_data(device);
if (!wacom)
return_VALUE(-EINVAL);
return_VALUE(AE_OK);
}
static int
wmi_stop (
struct acpi_device *device,
int type)
{
struct wmi *wacom = NULL;
ACPI_FUNCTION_TRACE("wmi_stop");
if (!device)
return_VALUE(-EINVAL);
wacom = acpi_driver_data(device);
return_VALUE(0);
}
int __init
wmi_init (void)
{
int result = 0;
ACPI_FUNCTION_TRACE("wmi_init");
wmi_dir = proc_mkdir(WMI_CLASS, acpi_root_dir);
if (!wmi_dir)
return_VALUE(-ENODEV);
result = acpi_bus_register_driver(&wmi_driver);
if (result < 0) {
remove_proc_entry(WMI_CLASS, acpi_root_dir);
return_VALUE(-ENODEV);
}
return_VALUE(0);
}
void __exit
wmi_exit (void)
{
ACPI_FUNCTION_TRACE("wmi_exit");
acpi_bus_unregister_driver(&wmi_driver);
remove_proc_entry(WMI_CLASS, acpi_root_dir);
return_VOID;
}
module_init(wmi_init);
module_exit(wmi_exit);