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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 
 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");
171 

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