diff options
Diffstat (limited to 'drivers/input/power.c')
| -rw-r--r-- | drivers/input/power.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/input/power.c b/drivers/input/power.c new file mode 100644 index 00000000000..bfc5c63ebff --- /dev/null +++ b/drivers/input/power.c @@ -0,0 +1,169 @@ +/* + * $Id: power.c,v 1.10 2001/09/25 09:17:15 vojtech Exp $ + * + * Copyright (c) 2001 "Crazy" James Simmons + * + * Input driver Power Management. + * + * Sponsored by Transvirtual Technology. + */ + +/* + * 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 + * + * Should you need to contact me, the author, you can do so by + * e-mail - mail your message to <jsimmons@transvirtual.com>. + */ + +#include <linux/module.h> +#include <linux/config.h> +#include <linux/input.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/tty.h> +#include <linux/delay.h> +#include <linux/pm.h> + +static struct input_handler power_handler; + +/* + * Power management can't be done in a interrupt context. So we have to + * use keventd. + */ +static int suspend_button_pushed = 0; +static void suspend_button_task_handler(void *data) +{ + udelay(200); /* debounce */ + suspend_button_pushed = 0; +} + +static DECLARE_WORK(suspend_button_task, suspend_button_task_handler, NULL); + +static void power_event(struct input_handle *handle, unsigned int type, + unsigned int code, int down) +{ + struct input_dev *dev = handle->dev; + + printk("Entering power_event\n"); + + if (type == EV_PWR) { + switch (code) { + case KEY_SUSPEND: + printk("Powering down entire device\n"); + + if (!suspend_button_pushed) { + suspend_button_pushed = 1; + schedule_work(&suspend_button_task); + } + break; + case KEY_POWER: + /* Hum power down the machine. */ + break; + default: + return; + } + } + + if (type == EV_KEY) { + switch (code) { + case KEY_SUSPEND: + printk("Powering down input device\n"); + /* This is risky. See pm.h for details. */ + if (dev->state != PM_RESUME) + dev->state = PM_RESUME; + else + dev->state = PM_SUSPEND; + pm_send(dev->pm_dev, dev->state, dev); + break; + case KEY_POWER: + /* Turn the input device off completely ? */ + break; + default: + return; + } + } + return; +} + +static struct input_handle *power_connect(struct input_handler *handler, + struct input_dev *dev, + struct input_device_id *id) +{ + struct input_handle *handle; + + if (!(handle = kmalloc(sizeof(struct input_handle), GFP_KERNEL))) + return NULL; + memset(handle, 0, sizeof(struct input_handle)); + + handle->dev = dev; + handle->handler = handler; + + input_open_device(handle); + + printk(KERN_INFO "power.c: Adding power management to input layer\n"); + return handle; +} + +static void power_disconnect(struct input_handle *handle) +{ + input_close_device(handle); + kfree(handle); +} + +static struct input_device_id power_ids[] = { + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, + .evbit = { BIT(EV_KEY) }, + .keybit = { [LONG(KEY_SUSPEND)] = BIT(KEY_SUSPEND) } + }, + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, + .evbit = { BIT(EV_KEY) }, + .keybit = { [LONG(KEY_POWER)] = BIT(KEY_POWER) } + }, + { + .flags = INPUT_DEVICE_ID_MATCH_EVBIT, + .evbit = { BIT(EV_PWR) }, + }, + { }, /* Terminating entry */ +}; + +MODULE_DEVICE_TABLE(input, power_ids); + +static struct input_handler power_handler = { + .event = power_event, + .connect = power_connect, + .disconnect = power_disconnect, + .name = "power", + .id_table = power_ids, +}; + +static int __init power_init(void) +{ + input_register_handler(&power_handler); + return 0; +} + +static void __exit power_exit(void) +{ + input_unregister_handler(&power_handler); +} + +module_init(power_init); +module_exit(power_exit); + +MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>"); +MODULE_DESCRIPTION("Input Power Management driver"); +MODULE_LICENSE("GPL"); |