132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*
|
|
* Input driver for PCAP events:
|
|
* * Power key
|
|
* * Headphone button
|
|
*
|
|
* Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/input.h>
|
|
#include <linux/mfd/ezx-pcap.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct pcap_keys {
|
|
struct pcap_chip *pcap;
|
|
struct input_dev *input;
|
|
};
|
|
|
|
/* PCAP2 interrupts us on keypress */
|
|
static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
|
|
{
|
|
struct pcap_keys *pcap_keys = _pcap_keys;
|
|
int pirq = irq_to_pcap(pcap_keys->pcap, irq);
|
|
u32 pstat;
|
|
|
|
ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
|
|
pstat &= 1 << pirq;
|
|
|
|
switch (pirq) {
|
|
case PCAP_IRQ_ONOFF:
|
|
input_report_key(pcap_keys->input, KEY_POWER, !pstat);
|
|
break;
|
|
case PCAP_IRQ_MIC:
|
|
input_report_key(pcap_keys->input, KEY_HP, !pstat);
|
|
break;
|
|
}
|
|
|
|
input_sync(pcap_keys->input);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int pcap_keys_probe(struct platform_device *pdev)
|
|
{
|
|
int err = -ENOMEM;
|
|
struct pcap_keys *pcap_keys;
|
|
struct input_dev *input_dev;
|
|
|
|
pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
|
|
if (!pcap_keys)
|
|
return err;
|
|
|
|
pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
|
|
|
|
input_dev = input_allocate_device();
|
|
if (!input_dev)
|
|
goto fail;
|
|
|
|
pcap_keys->input = input_dev;
|
|
|
|
platform_set_drvdata(pdev, pcap_keys);
|
|
input_dev->name = pdev->name;
|
|
input_dev->phys = "pcap-keys/input0";
|
|
input_dev->id.bustype = BUS_HOST;
|
|
input_dev->dev.parent = &pdev->dev;
|
|
|
|
__set_bit(EV_KEY, input_dev->evbit);
|
|
__set_bit(KEY_POWER, input_dev->keybit);
|
|
__set_bit(KEY_HP, input_dev->keybit);
|
|
|
|
err = input_register_device(input_dev);
|
|
if (err)
|
|
goto fail_allocate;
|
|
|
|
err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
|
|
pcap_keys_handler, 0, "Power key", pcap_keys);
|
|
if (err)
|
|
goto fail_register;
|
|
|
|
err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
|
|
pcap_keys_handler, 0, "Headphone button", pcap_keys);
|
|
if (err)
|
|
goto fail_pwrkey;
|
|
|
|
return 0;
|
|
|
|
fail_pwrkey:
|
|
free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
|
|
fail_register:
|
|
input_unregister_device(input_dev);
|
|
goto fail;
|
|
fail_allocate:
|
|
input_free_device(input_dev);
|
|
fail:
|
|
kfree(pcap_keys);
|
|
return err;
|
|
}
|
|
|
|
static int pcap_keys_remove(struct platform_device *pdev)
|
|
{
|
|
struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
|
|
|
|
free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
|
|
free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
|
|
|
|
input_unregister_device(pcap_keys->input);
|
|
kfree(pcap_keys);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver pcap_keys_device_driver = {
|
|
.probe = pcap_keys_probe,
|
|
.remove = pcap_keys_remove,
|
|
.driver = {
|
|
.name = "pcap-keys",
|
|
}
|
|
};
|
|
module_platform_driver(pcap_keys_device_driver);
|
|
|
|
MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
|
|
MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:pcap_keys");
|