/* * button.c - ACPI Button Driver * * 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 <linux/input.h> #include <linux/slab.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define PREFIX "ACPI: " #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" #define ACPI_BUTTON_TYPE_POWER 0x01 #define ACPI_BUTTON_SUBCLASS_SLEEP "sleep" #define ACPI_BUTTON_HID_SLEEP "PNP0C0E" #define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button" #define ACPI_BUTTON_TYPE_SLEEP 0x03 #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("button"); MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Button Driver"); MODULE_LICENSE("GPL"); static const struct acpi_device_id button_device_ids[] = { {ACPI_BUTTON_HID_LID, 0}, {ACPI_BUTTON_HID_SLEEP, 0}, {ACPI_BUTTON_HID_SLEEPF, 0}, {ACPI_BUTTON_HID_POWER, 0}, {ACPI_BUTTON_HID_POWERF, 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, button_device_ids); static int acpi_button_add(struct acpi_device *device); static int acpi_button_remove(struct acpi_device *device, int type); static int acpi_button_resume(struct acpi_device *device); static void acpi_button_notify(struct acpi_device *device, u32 event); static struct acpi_driver acpi_button_driver = { .name = "button", .class = ACPI_BUTTON_CLASS, .ids = button_device_ids, .ops = { .add = acpi_button_add, .resume = acpi_button_resume, .remove = acpi_button_remove, .notify = acpi_button_notify, }, }; struct acpi_button { unsigned int type; struct input_dev *input; char phys[32]; /* for input device */ unsigned long pushed; bool wakeup_enabled; }; static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier); static struct acpi_device *lid_device; /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ static struct proc_dir_entry *acpi_button_dir; static struct proc_dir_entry *acpi_lid_dir; static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) { struct acpi_device *device = seq->private; acpi_status status; unsigned long long state; status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); seq_printf(seq, "state: %s\n", ACPI_FAILURE(status) ? "unsupported" : (state ? "open" : "closed")); return 0; } static int acpi_button_state_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_button_state_seq_show, PDE(inode)->data); } static const struct file_operations acpi_button_state_fops = { .owner = THIS_MODULE, .open = acpi_button_state_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int acpi_button_add_fs(struct acpi_device *device) { struct acpi_button *button = acpi_driver_data(device); struct proc_dir_entry *entry = NULL; int ret = 0; /* procfs I/F for ACPI lid device only */ if (button->type != ACPI_BUTTON_TYPE_LID) return 0; if (acpi_button_dir || acpi_lid_dir) { printk(KERN_ERR PREFIX "More than one Lid device found!\n"); return -EEXIST; } /* create /proc/acpi/button */ acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir); if (!acpi_button_dir) return -ENODEV; /* create /proc/acpi/button/lid */ acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); if (!acpi_lid_dir) { ret = -ENODEV; goto remove_button_dir; } /* create /proc/acpi/button/lid/LID/ */ acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir); if (!acpi_device_dir(device)) { ret = -ENODEV; goto remove_lid_dir; } /* create /proc/acpi/button/lid/LID/state */ entry = proc_create_data(ACPI_BUTTON_FILE_STATE, S_IRUGO, acpi_device_dir(device), &acpi_button_state_fops, device); if (!entry) { ret = -ENODEV; goto remove_dev_dir; } done: return ret; remove_dev_dir: remove_proc_entry(acpi_device_bid(device), acpi_lid_dir); acpi_device_dir(device) = NULL; remove_lid_dir: remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); remove_button_dir: remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); goto done; } static int acpi_button_remove_fs(struct acpi_device *device) { struct acpi_button *button = acpi_driver_data(device); if (button->type != ACPI_BUTTON_TYPE_LID) return 0; remove_proc_entry(ACPI_BUTTON_FILE_STATE, acpi_device_dir(device)); remove_proc_entry(acpi_device_bid(device), acpi_lid_dir); acpi_device_dir(device) = NULL; remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); return 0; } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ int acpi_lid_notifier_register(struct notifier_block *nb) { return blocking_notifier_chain_register(&acpi_lid_notifier, nb); } EXPORT_SYMBOL(acpi_lid_notifier_register); int acpi_lid_notifier_unregister(struct notifier_block *nb) { return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb); } EXPORT_SYMBOL(acpi_lid_notifier_unregister); int acpi_lid_open(void) { acpi_status status; unsigned long long state; if (!lid_device) return -ENODEV; status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL, &state); if (ACPI_FAILURE(status)) return -ENODEV; return !!state; } EXPORT_SYMBOL(acpi_lid_open); static int acpi_lid_send_state(struct acpi_device *device) { struct acpi_button *button = acpi_driver_data(device); unsigned long long state; acpi_status status; int ret; status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); if (ACPI_FAILURE(status)) return -ENODEV; /* input layer checks if event is redundant */ input_report_switch(button->input, SW_LID, !state); input_sync(button->input); if (state) pm_wakeup_event(&device->dev, 0); ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); if (ret == NOTIFY_DONE) ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); if (ret == NOTIFY_DONE || ret == NOTIFY_OK) { /* * It is also regarded as success if the notifier_chain * returns NOTIFY_OK or NOTIFY_DONE. */ ret = 0; } return ret; } static void acpi_button_notify(struct acpi_device *device, u32 event) { struct acpi_button *button = acpi_driver_data(device); struct input_dev *input; switch (event) { case ACPI_FIXED_HARDWARE_EVENT: event = ACPI_BUTTON_NOTIFY_STATUS; /* fall through */ case ACPI_BUTTON_NOTIFY_STATUS: input = button->input; if (button->type == ACPI_BUTTON_TYPE_LID) { acpi_lid_send_state(device); } else { int keycode = test_bit(KEY_SLEEP, input->keybit) ? KEY_SLEEP : KEY_POWER; input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); input_sync(input); pm_wakeup_event(&device->dev, 0); } acpi_bus_generate_proc_event(device, event, ++button->pushed); break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported event [0x%x]\n", event)); break; } } static int acpi_button_resume(struct acpi_device *device) { struct acpi_button *button = acpi_driver_data(device); if (button->type == ACPI_BUTTON_TYPE_LID) return acpi_lid_send_state(device); return 0; } static int acpi_button_add(struct acpi_device *device) { struct acpi_button *button; struct input_dev *input; const char *hid = acpi_device_hid(device); char *name, *class; int error; button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL); if (!button) return -ENOMEM; device->driver_data = button; button->input = input = input_allocate_device(); if (!input) { error = -ENOMEM; goto err_free_button; } name = acpi_device_name(device); class = acpi_device_class(device); if (!strcmp(hid, ACPI_BUTTON_HID_POWER) || !strcmp(hid, ACPI_BUTTON_HID_POWERF)) { button->type = ACPI_BUTTON_TYPE_POWER; strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER); sprintf(class, "%s/%s", ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER); } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) || !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) { button->type = ACPI_BUTTON_TYPE_SLEEP; strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP); sprintf(class, "%s/%s", ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP); } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) { button->type = ACPI_BUTTON_TYPE_LID; strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID); sprintf(class, "%s/%s", ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID); } else { printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid); error = -ENODEV; goto err_free_input; } error = acpi_button_add_fs(device); if (error) goto err_free_input; snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); input->name = name; input->phys = button->phys; input->id.bustype = BUS_HOST; input->id.product = button->type; input->dev.parent = &device->dev; switch (button->type) { case ACPI_BUTTON_TYPE_POWER: input->evbit[0] = BIT_MASK(EV_KEY); set_bit(KEY_POWER, input->keybit); break; case ACPI_BUTTON_TYPE_SLEEP: input->evbit[0] = BIT_MASK(EV_KEY); set_bit(KEY_SLEEP, input->keybit); break; case ACPI_BUTTON_TYPE_LID: input->evbit[0] = BIT_MASK(EV_SW); set_bit(SW_LID, input->swbit); break; } error = input_register_device(input); if (error) goto err_remove_fs; if (button->type == ACPI_BUTTON_TYPE_LID) { acpi_lid_send_state(device); /* * This assumes there's only one lid device, or if there are * more we only care about the last one... */ lid_device = device; } if (device->wakeup.flags.valid) { /* Button's GPE is run-wake GPE */ acpi_enable_gpe(device->wakeup.gpe_device, device->wakeup.gpe_number); if (!device_may_wakeup(&device->dev)) { device_set_wakeup_enable(&device->dev, true); button->wakeup_enabled = true; } } printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device)); return 0; err_remove_fs: acpi_button_remove_fs(device); err_free_input: input_free_device(input); err_free_button: kfree(button); return error; } static int acpi_button_remove(struct acpi_device *device, int type) { struct acpi_button *button = acpi_driver_data(device); if (device->wakeup.flags.valid) { acpi_disable_gpe(device->wakeup.gpe_device, device->wakeup.gpe_number); if (button->wakeup_enabled) device_set_wakeup_enable(&device->dev, false); } acpi_button_remove_fs(device); input_unregister_device(button->input); kfree(button); return 0; } static int __init acpi_button_init(void) { return acpi_bus_register_driver(&acpi_button_driver); } static void __exit acpi_button_exit(void) { acpi_bus_unregister_driver(&acpi_button_driver); } module_init(acpi_button_init); module_exit(acpi_button_exit);