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);