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
  30 #define PM8607_WAKEUP           0x0b
  31
  32 #define LONG_ONKEY_EN           (1 << 1)
  33 #define ONKEY_STATUS            (1 << 0)
  34
  35 struct 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 */
  44 static 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
  59 static 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
 110 out_irq:
 111         input_unregister_device(info->idev);
 112         kfree(info);
 113         return ret;
 114
 115 out_reg:
 116         input_free_device(info->idev);
 117 out:
 118         kfree(info);
 119         return ret;
 120 }
 121
 122 static 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
 132 static 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
 141 static int __init pm860x_onkey_init(void)
 142 {
 143         return platform_driver_register(&pm860x_onkey_driver);
 144 }
 145 module_init(pm860x_onkey_init);
 146
 147 static void __exit pm860x_onkey_exit(void)
 148 {
 149         platform_driver_unregister(&pm860x_onkey_driver);
 150 }
 151 module_exit(pm860x_onkey_exit);
 152
 153 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
 154 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 155 MODULE_LICENSE("GPL");