LXR linux/drivers/input/misc/twl4030-pwrbutton.c

   1/**
   2 * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
   3 *
   4 * Copyright (C) 2008-2009 Nokia Corporation
   5 *
   6 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
   7 * Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
   8 *
   9 * This file is subject to the terms and conditions of the GNU General
  10 * Public License. See the file "COPYING" in the main directory of this
  11 * archive for more details.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/init.h>
  25#include <linux/kernel.h>
  26#include <linux/errno.h>
  27#include <linux/input.h>
  28#include <linux/interrupt.h>
  29#include <linux/platform_device.h>
  30#include <linux/i2c/twl.h>
  31
  32#define PWR_PWRON_IRQ (1 << 0)
  33
  34#define STS_HW_CONDITIONS 0xf
  35
  36static irqreturn_t powerbutton_irq(int irq, void *_pwr)
  37{
  38        struct input_dev *pwr = _pwr;
  39        int err;
  40        u8 value;
  41
  42        err = twl_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
  43                                STS_HW_CONDITIONS);
  44        if (!err)  {
  45                input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
  46                input_sync(pwr);
  47        } else {
  48                dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
  49                        " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
  50        }
  51
  52        return IRQ_HANDLED;
  53}
  54
  55static int __init twl4030_pwrbutton_probe(struct platform_device *pdev)
  56{
  57        struct input_dev *pwr;
  58        int irq = platform_get_irq(pdev, 0);
  59        int err;
  60
  61        pwr = input_allocate_device();
  62        if (!pwr) {
  63                dev_dbg(&pdev->dev, "Can't allocate power button\n");
  64                return -ENOMEM;
  65        }
  66
  67        pwr->evbit[0] = BIT_MASK(EV_KEY);
  68        pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
  69        pwr->name = "twl4030_pwrbutton";
  70        pwr->phys = "twl4030_pwrbutton/input0";
  71        pwr->dev.parent = &pdev->dev;
  72
  73        err = request_threaded_irq(irq, NULL, powerbutton_irq,
  74                        IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
  75                        "twl4030_pwrbutton", pwr);
  76        if (err < 0) {
  77                dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
  78                goto free_input_dev;
  79        }
  80
  81        err = input_register_device(pwr);
  82        if (err) {
  83                dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
  84                goto free_irq;
  85        }
  86
  87        platform_set_drvdata(pdev, pwr);
  88
  89        return 0;
  90
  91free_irq:
  92        free_irq(irq, NULL);
  93free_input_dev:
  94        input_free_device(pwr);
  95        return err;
  96}
  97
  98static int __exit twl4030_pwrbutton_remove(struct platform_device *pdev)
  99{
 100        struct input_dev *pwr = platform_get_drvdata(pdev);
 101        int irq = platform_get_irq(pdev, 0);
 102
 103        free_irq(irq, pwr);
 104        input_unregister_device(pwr);
 105
 106        return 0;
 107}
 108
 109static struct platform_driver twl4030_pwrbutton_driver = {
 110        .remove         = __exit_p(twl4030_pwrbutton_remove),
 111        .driver         = {
 112                .name   = "twl4030_pwrbutton",
 113                .owner  = THIS_MODULE,
 114        },
 115};
 116
 117static int __init twl4030_pwrbutton_init(void)
 118{
 119        return platform_driver_probe(&twl4030_pwrbutton_driver,
 120                        twl4030_pwrbutton_probe);
 121}
 122module_init(twl4030_pwrbutton_init);
 123
 124static void __exit twl4030_pwrbutton_exit(void)
 125{
 126        platform_driver_unregister(&twl4030_pwrbutton_driver);
 127}
 128module_exit(twl4030_pwrbutton_exit);
 129
 130MODULE_ALIAS("platform:twl4030_pwrbutton");
 131MODULE_DESCRIPTION("Triton2 Power Button");
 132MODULE_LICENSE("GPL");
 133MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
 134MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
 135
 136