LXR linux/drivers/input/misc/88pm860x

   1/*
   2 * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
   3 *
   4 * Copyright (C) 2009-2010 Marvell International Ltd.
   5 *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6 *
   7 * This file is subject to the terms and conditions of the GNU General
   8 * Public License. See the file "COPYING" in the main directory of this
   9 * archive for more details.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21#include <linux/kernel.h>
  22#include <linux/module.h>
  23#include <linux/platform_device.h>
  24#include <linux/i2c.h>
  25#include <linux/input.h>
  26#include <linux/interrupt.h>
  27#include <linux/mfd/88pm860x.h>
  28#include <linux/slab.h>
  29
  30#define PM8607_WAKEUP           0x0b
  31
  32#define LONG_ONKEY_EN           (1 << 1)
  33#define ONKEY_STATUS            (1 << 0)
  34
  35struct pm860x_onkey_info {
  36        struct input_dev        *idev;
  37        struct pm860x_chip      *chip;
  38        struct i2c_client       *i2c;
  39        struct device           *dev;
  40        int                     irq;
  41};
  42
  43/* 88PM860x gives us an interrupt when ONKEY is held */
  44static irqreturn_t pm860x_onkey_handler(int irq, void *data)
  45{
  46        struct pm860x_onkey_info *info = data;
  47        int ret;
  48
  49        ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
  50        ret &= ONKEY_STATUS;
  51        input_report_key(info->idev, KEY_POWER, ret);
  52        input_sync(info->idev);
  53
  54        /* Enable 8-second long onkey detection */
  55        pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
  56        return IRQ_HANDLED;
  57}
  58
  59static int __devinit pm860x_onkey_probe(struct platform_device *pdev)
  60{
  61        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
  62        struct pm860x_onkey_info *info;
  63        int irq, ret;
  64
  65        irq = platform_get_irq(pdev, 0);
  66        if (irq < 0) {
  67                dev_err(&pdev->dev, "No IRQ resource!\n");
  68                return -EINVAL;
  69        }
  70
  71        info = kzalloc(sizeof(struct pm860x_onkey_info), GFP_KERNEL);
  72        if (!info)
  73                return -ENOMEM;
  74        info->chip = chip;
  75        info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
  76        info->dev = &pdev->dev;
  77        info->irq = irq;
  78
  79        info->idev = input_allocate_device();
  80        if (!info->idev) {
  81                dev_err(chip->dev, "Failed to allocate input dev\n");
  82                ret = -ENOMEM;
  83                goto out;
  84        }
  85
  86        info->idev->name = "88pm860x_on";
  87        info->idev->phys = "88pm860x_on/input0";
  88        info->idev->id.bustype = BUS_I2C;
  89        info->idev->dev.parent = &pdev->dev;
  90        info->idev->evbit[0] = BIT_MASK(EV_KEY);
  91        info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
  92
  93        ret = input_register_device(info->idev);
  94        if (ret) {
  95                dev_err(chip->dev, "Can't register input device: %d\n", ret);
  96                goto out_reg;
  97        }
  98
  99        ret = request_threaded_irq(info->irq, NULL, pm860x_onkey_handler,
 100                                   IRQF_ONESHOT, "onkey", info);
 101        if (ret < 0) {
 102                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 103                        info->irq, ret);
 104                goto out_irq;
 105        }
 106
 107        platform_set_drvdata(pdev, info);
 108        return 0;
 109
 110out_irq:
 111        input_unregister_device(info->idev);
 112        kfree(info);
 113        return ret;
 114
 115out_reg:
 116        input_free_device(info->idev);
 117out:
 118        kfree(info);
 119        return ret;
 120}
 121
 122static int __devexit pm860x_onkey_remove(struct platform_device *pdev)
 123{
 124        struct pm860x_onkey_info *info = platform_get_drvdata(pdev);
 125
 126        free_irq(info->irq, info);
 127        input_unregister_device(info->idev);
 128        kfree(info);
 129        return 0;
 130}
 131
 132static struct platform_driver pm860x_onkey_driver = {
 133        .driver         = {
 134                .name   = "88pm860x-onkey",
 135                .owner  = THIS_MODULE,
 136        },
 137        .probe          = pm860x_onkey_probe,
 138        .remove         = __devexit_p(pm860x_onkey_remove),
 139};
 140
 141static int __init pm860x_onkey_init(void)
 142{
 143        return platform_driver_register(&pm860x_onkey_driver);
 144}
 145module_init(pm860x_onkey_init);
 146
 147static void __exit pm860x_onkey_exit(void)
 148{
 149        platform_driver_unregister(&pm860x_onkey_driver);
 150}
 151module_exit(pm860x_onkey_exit);
 152
 153MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
 154MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 155MODULE_LICENSE("GPL");
 156