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 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         device_init_wakeup(&pdev->dev, 1);
 109
 110         return 0;
 111
 112 out_irq:
 113         input_unregister_device(info->idev);
 114         kfree(info);
 115         return ret;
 116
 117 out_reg:
 118         input_free_device(info->idev);
 119 out:
 120         kfree(info);
 121         return ret;
 122 }
 123
 124 static int pm860x_onkey_remove(struct platform_device *pdev)
 125 {
 126         struct pm860x_onkey_info *info = platform_get_drvdata(pdev);
 127
 128         free_irq(info->irq, info);
 129         input_unregister_device(info->idev);
 130         kfree(info);
 131         return 0;
 132 }
 133
 134 #ifdef CONFIG_PM_SLEEP
 135 static int pm860x_onkey_suspend(struct device *dev)
 136 {
 137         struct platform_device *pdev = to_platform_device(dev);
 138         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 139
 140         if (device_may_wakeup(dev))
 141                 chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
 142         return 0;
 143 }
 144 static int pm860x_onkey_resume(struct device *dev)
 145 {
 146         struct platform_device *pdev = to_platform_device(dev);
 147         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 148
 149         if (device_may_wakeup(dev))
 150                 chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
 151         return 0;
 152 }
 153 #endif
 154
 155 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
 156
 157 static struct platform_driver pm860x_onkey_driver = {
 158         .driver         = {
 159                 .name   = "88pm860x-onkey",
 160                 .owner  = THIS_MODULE,
 161                 .pm     = &pm860x_onkey_pm_ops,
 162         },
 163         .probe          = pm860x_onkey_probe,
 164         .remove         = pm860x_onkey_remove,
 165 };
 166 module_platform_driver(pm860x_onkey_driver);
 167
 168 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
 169 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 170 MODULE_LICENSE("GPL");