drivers/input/misc/88pm860x_onkey.c

   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
  36 struct 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 */
  45 static 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
  60 static 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                 dev_err(&pdev->dev, "No IRQ resource!\n");
  69                 return -EINVAL;
  70         }
  71
  72         info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info),
  73                             GFP_KERNEL);
  74         if (!info)
  75                 return -ENOMEM;
  76         info->chip = chip;
  77         info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
  78         info->dev = &pdev->dev;
  79         info->irq = irq;
  80
  81         info->idev = devm_input_allocate_device(&pdev->dev);
  82         if (!info->idev) {
  83                 dev_err(chip->dev, "Failed to allocate input dev\n");
  84                 return -ENOMEM;
  85         }
  86
  87         info->idev->name = "88pm860x_on";
  88         info->idev->phys = "88pm860x_on/input0";
  89         info->idev->id.bustype = BUS_I2C;
  90         info->idev->dev.parent = &pdev->dev;
  91         info->idev->evbit[0] = BIT_MASK(EV_KEY);
  92         info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
  93
  94         ret = input_register_device(info->idev);
  95         if (ret) {
  96                 dev_err(chip->dev, "Can't register input device: %d\n", ret);
  97                 return ret;
  98         }
  99
 100         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
 101                                         pm860x_onkey_handler, IRQF_ONESHOT,
 102                                         "onkey", info);
 103         if (ret < 0) {
 104                 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
 105                         info->irq, ret);
 106                 return ret;
 107         }
 108
 109         platform_set_drvdata(pdev, info);
 110         device_init_wakeup(&pdev->dev, 1);
 111
 112         return 0;
 113 }
 114
 115 static int __maybe_unused pm860x_onkey_suspend(struct device *dev)
 116 {
 117         struct platform_device *pdev = to_platform_device(dev);
 118         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 119
 120         if (device_may_wakeup(dev))
 121                 chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
 122         return 0;
 123 }
 124 static int __maybe_unused pm860x_onkey_resume(struct device *dev)
 125 {
 126         struct platform_device *pdev = to_platform_device(dev);
 127         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 128
 129         if (device_may_wakeup(dev))
 130                 chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
 131         return 0;
 132 }
 133
 134 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
 135
 136 static struct platform_driver pm860x_onkey_driver = {
 137         .driver         = {
 138                 .name   = "88pm860x-onkey",
 139                 .pm     = &pm860x_onkey_pm_ops,
 140         },
 141         .probe          = pm860x_onkey_probe,
 142 };
 143 module_platform_driver(pm860x_onkey_driver);
 144
 145 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
 146 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 147 MODULE_LICENSE("GPL");