TC1100 WMI driver

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  * Copyright (C) 2001, 2002 Andy Grover  * Copyright (C) 2001, 2002 Paul Diefenbaugh  * * * *  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. * * */


 * 1) include 
 * 2) include 
 * 3) include 
 * 4) include 
 * 5) include 
 * 6) include 
 * 7) include 
 * 8) include 
 * 9) include 
 * 10) include 
 * 11) include 


 * 1) define WMI_COMPONENT		0x40000000
 * 2) define WMI_CLASS			"wmi"
 * 3) define WMI_HID 			"PNP0C14"
 * 4) define WMI_DRIVER_NAME		"ACPI WMI Driver"
 * 5) define WMI_DEVICE_NAME		"Windows Management Interface"
 * 6) define WMI_FILE_STATE		"state"
 * 7) define WMI_FILE_WLAN		"wlan"
 * 8) define WMI_FILE_BLUETOOTH	"bluetooth"
 * 9) define WMI_NOTIFY_STATUS		0x80
 * 10) define WMI_STATUS_OFFLINE		0x0D
 * 11) define WMI_STATUS_ONLINE		0x0F
 * 12) define WMI_STATUS_UNKNOWN		0xFF

ACPI_MODULE_NAME		("wmi")
 * 1) define _COMPONENT		WMI_COMPONENT

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", &params, &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", &params, &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", &params, &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;

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; }
 * 1) if 0
 * 1) 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);