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#include <linux/device.h>
  30
  31#define PM8607_WAKEUP           0x0b
  32
  33#define LONG_ONKEY_EN           (1 << 1)
  34#define ONKEY_STATUS            (1 << 0)
  35
  36struct pm860x_onkey_info {
  37        struct input_dev        *idev;
  38        struct pm860x_chip      *chip;
  39        struct i2c_client       *i2c;
  40        struct device           *dev;
  41        int                     irq;
  42};
  43
  44/* 88PM860x gives us an interrupt when ONKEY is held */
  45static irqreturn_t pm860x_onkey_handler(int irq, void *data)
  46{
  47        struct pm860x_onkey_info *info = data;
  48        int ret;
  49
  50        ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
  51        ret &= ONKEY_STATUS;
  52        input_report_key(info->idev, KEY_POWER, ret);
  53        input_sync(info->idev);
  54
  55        /* Enable 8-second long onkey detection */
  56        pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
  57        return IRQ_HANDLED;
  58}
  59
  60static int pm860x_onkey_probe(struct platform_device *pdev)
  61{
  62        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
  63        struct pm860x_onkey_info *info;
  64        int irq, ret;
  65
  66        irq = platform_get_irq(pdev, 0);
  67        if (irq < 0)
  68                return -EINVAL;
  69
  70        info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info),
  71                            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 = devm_input_allocate_device(&pdev->dev);
  80        if (!info->idev) {
  81                dev_err(chip->dev, "Failed to allocate input dev\n");
  82                return -ENOMEM;
  83        }
  84
  85        info->idev->name = "88pm860x_on";
  86        info->idev->phys = "88pm860x_on/input0";
  87        info->idev->id.bustype = BUS_I2C;
  88        info->idev->dev.parent = &pdev->dev;
  89        info->idev->evbit[0] = BIT_MASK(EV_KEY);
  90        info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
  91
  92        ret = input_register_device(info->idev);
  93        if (ret) {
  94                dev_err(chip->dev, "Can't register input device: %d\n", ret);
  95                return ret;
  96        }
  97
  98        ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
  99                                        pm860x_onkey_handler, IRQF_ONESHOT,
 100                                        "onkey", info);
 101        if (ret < 0) {
 102                dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 103                        info->irq, ret);
 104                return ret;
 105        }
 106
 107        platform_set_drvdata(pdev, info);
 108        device_init_wakeup(&pdev->dev, 1);
 109
 110        return 0;
 111}
 112
 113static int __maybe_unused pm860x_onkey_suspend(struct device *dev)
 114{
 115        struct platform_device *pdev = to_platform_device(dev);
 116        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 117
 118        if (device_may_wakeup(dev))
 119                chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
 120        return 0;
 121}
 122static int __maybe_unused pm860x_onkey_resume(struct device *dev)
 123{
 124        struct platform_device *pdev = to_platform_device(dev);
 125        struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 126
 127        if (device_may_wakeup(dev))
 128                chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
 129        return 0;
 130}
 131
 132static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
 133
 134static struct platform_driver pm860x_onkey_driver = {
 135        .driver         = {
 136                .name   = "88pm860x-onkey",
 137                .pm     = &pm860x_onkey_pm_ops,
 138        },
 139        .probe          = pm860x_onkey_probe,
 140};
 141module_platform_driver(pm860x_onkey_driver);
 142
 143MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
 144MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 145MODULE_LICENSE("GPL");
 146