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Linux/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 #ifdef CONFIG_PM_SLEEP
116 static int pm860x_onkey_suspend(struct device *dev)
117 {
118         struct platform_device *pdev = to_platform_device(dev);
119         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
120 
121         if (device_may_wakeup(dev))
122                 chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
123         return 0;
124 }
125 static int pm860x_onkey_resume(struct device *dev)
126 {
127         struct platform_device *pdev = to_platform_device(dev);
128         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
129 
130         if (device_may_wakeup(dev))
131                 chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
132         return 0;
133 }
134 #endif
135 
136 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
137 
138 static struct platform_driver pm860x_onkey_driver = {
139         .driver         = {
140                 .name   = "88pm860x-onkey",
141                 .owner  = THIS_MODULE,
142                 .pm     = &pm860x_onkey_pm_ops,
143         },
144         .probe          = pm860x_onkey_probe,
145 };
146 module_platform_driver(pm860x_onkey_driver);
147 
148 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
149 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
150 MODULE_LICENSE("GPL");
151 

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