diff options
Diffstat (limited to 'kernel/drivers/acpi/button.c')
| -rw-r--r-- | kernel/drivers/acpi/button.c | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/kernel/drivers/acpi/button.c b/kernel/drivers/acpi/button.c new file mode 100644 index 000000000..6d5d1832a --- /dev/null +++ b/kernel/drivers/acpi/button.c @@ -0,0 +1,453 @@ +/* + * 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 <linux/acpi.h> +#include <acpi/button.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); +static void acpi_button_notify(struct acpi_device *device, u32 event); + +#ifdef CONFIG_PM_SLEEP +static int acpi_button_suspend(struct device *dev); +static int acpi_button_resume(struct device *dev); +#else +#define acpi_button_suspend NULL +#define acpi_button_resume NULL +#endif +static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume); + +static struct acpi_driver acpi_button_driver = { + .name = "button", + .class = ACPI_BUTTON_CLASS, + .ids = button_device_ids, + .ops = { + .add = acpi_button_add, + .remove = acpi_button_remove, + .notify = acpi_button_notify, + }, + .drv.pm = &acpi_button_pm, +}; + +struct acpi_button { + unsigned int type; + struct input_dev *input; + char phys[32]; /* for input device */ + unsigned long pushed; + bool suspended; +}; + +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_DATA(inode)); +} + +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; + + pm_wakeup_event(&device->dev, 0); + if (button->suspended) + break; + + 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); + + acpi_bus_generate_netlink_event( + device->pnp.device_class, + dev_name(&device->dev), + event, ++button->pushed); + } + break; + default: + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Unsupported event [0x%x]\n", event)); + break; + } +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_button_suspend(struct device *dev) +{ + struct acpi_device *device = to_acpi_device(dev); + struct acpi_button *button = acpi_driver_data(device); + + button->suspended = true; + return 0; +} + +static int acpi_button_resume(struct device *dev) +{ + struct acpi_device *device = to_acpi_device(dev); + struct acpi_button *button = acpi_driver_data(device); + + button->suspended = false; + if (button->type == ACPI_BUTTON_TYPE_LID) + return acpi_lid_send_state(device); + return 0; +} +#endif + +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_set_capability(input, EV_KEY, KEY_POWER); + break; + + case ACPI_BUTTON_TYPE_SLEEP: + input_set_capability(input, EV_KEY, KEY_SLEEP); + break; + + case ACPI_BUTTON_TYPE_LID: + input_set_capability(input, EV_SW, SW_LID); + 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; + } + + 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) +{ + struct acpi_button *button = acpi_driver_data(device); + + acpi_button_remove_fs(device); + input_unregister_device(button->input); + kfree(button); + return 0; +} + +module_acpi_driver(acpi_button_driver); |