/* * acpi_button.c - ACPI Button Driver ($Revision: 30 $) * * 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. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include #include #include #include #include #include #define ACPI_BUTTON_COMPONENT 0x00080000 #define ACPI_BUTTON_DRIVER_NAME "ACPI Button Driver" #define ACPI_BUTTON_CLASS "button" #define ACPI_BUTTON_FILE_INFO "info" #define ACPI_BUTTON_FILE_STATE "state" #define ACPI_BUTTON_TYPE_UNKNOWN 0x00 #define ACPI_BUTTON_NOTIFY_STATUS 0x80 #define ACPI_BUTTON_SUBCLASS_POWER "power" #define ACPI_BUTTON_HID_POWER "PNP0C0C" #define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button (CM)" #define ACPI_BUTTON_DEVICE_NAME_POWERF "Power Button (FF)" #define ACPI_BUTTON_TYPE_POWER 0x01 #define ACPI_BUTTON_TYPE_POWERF 0x02 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button (CM)" #define ACPI_BUTTON_DEVICE_NAME_SLEEPF "Sleep Button (FF)" #define ACPI_BUTTON_TYPE_SLEEP 0x03 #define ACPI_BUTTON_TYPE_SLEEPF 0x04 #define ACPI_BUTTON_SUBCLASS_LID "lid" #define ACPI_BUTTON_HID_LID "PNP0C0D" #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" #define ACPI_BUTTON_TYPE_LID 0x05 #define _COMPONENT ACPI_BUTTON_COMPONENT ACPI_MODULE_NAME ("acpi_button") MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME); MODULE_LICENSE("GPL"); static int major; static int acpi_button_add (struct acpi_device *device); static int acpi_button_remove (struct acpi_device *device, int type); ssize_t button_read(struct file*, char *, size_t, loff_t*); DECLARE_WAIT_QUEUE_HEAD(button_que); static struct acpi_driver acpi_button_driver = { .name = ACPI_BUTTON_DRIVER_NAME, .class = ACPI_BUTTON_CLASS, .ids = "ACPI_FPB", .ops = { .add = acpi_button_add, .remove = acpi_button_remove, }, }; struct acpi_button { acpi_handle handle; struct acpi_device *device; /* Fixed button kludge */ u8 type; unsigned long pushed; }; struct file_operations fops = { .read = button_read }; /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ ssize_t button_read( struct file* filp, char *buf, size_t n, loff_t *offp) { printk("button read...\n"); interruptible_sleep_on(&button_que); return 0; } acpi_status acpi_button_notify_fixed ( void *data) { printk("notify called...\n"); wake_up_interruptible(&button_que); return_ACPI_STATUS(AE_OK); } static int acpi_button_add ( struct acpi_device *device) { int result = 0; acpi_status status = AE_OK; struct acpi_button *button = NULL; ACPI_FUNCTION_TRACE("acpi_button_add"); printk("acpi_button_add...\n"); if (!device) return_VALUE(-EINVAL); button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL); if (!button) return_VALUE(-ENOMEM); memset(button, 0, sizeof(struct acpi_button)); button->device = device; button->handle = device->handle; acpi_driver_data(device) = button; /* * Determine the button type (via hid), as fixed-feature buttons * need to be handled a bit differently than generic-space. */ if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) { printk("hid = %s\n", acpi_device_hid(device)); button->type = ACPI_BUTTON_TYPE_POWERF; strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWERF); sprintf(acpi_device_class(device), "%s/%s", ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); } else { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unsupported hid [%s]\n", acpi_device_hid(device))); result = -ENODEV; goto end; } /* * Ensure only one button of each type is used. */ status = acpi_install_fixed_event_handler ( ACPI_EVENT_POWER_BUTTON, acpi_button_notify_fixed, button); if (ACPI_FAILURE(status)) { ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error installing notify handler\n")); result = -ENODEV; goto end; } printk(KERN_INFO PREFIX "%s [%s]\n", acpi_device_name(device), acpi_device_bid(device)); end: if (result) { kfree(button); } return_VALUE(result); } static int acpi_button_remove (struct acpi_device *device, int type) { acpi_status status = 0; struct acpi_button *button = NULL; ACPI_FUNCTION_TRACE("acpi_button_remove"); printk("acpi_button_remove...\n"); if (!device || !acpi_driver_data(device)) return_VALUE(-EINVAL); button = acpi_driver_data(device); /* Unregister for device notifications. */ status = acpi_remove_fixed_event_handler( ACPI_EVENT_POWER_BUTTON, acpi_button_notify_fixed); if (ACPI_FAILURE(status)) ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error removing notify handler\n")); kfree(button); return_VALUE(0); } static int __init acpi_button_init (void) { int result = 0; ACPI_FUNCTION_TRACE("acpi_button_init"); result = acpi_bus_register_driver(&acpi_button_driver); if(result) return result; major = register_chrdev(0, "button", &fops); if(major < 0) return major; printk("registered. major = %d\n", major); return 0; } static void __exit acpi_button_exit (void) { ACPI_FUNCTION_TRACE("acpi_button_exit"); acpi_bus_unregister_driver(&acpi_button_driver); unregister_chrdev(major, "button"); } module_init(acpi_button_init); module_exit(acpi_button_exit);