156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/*
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* 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
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*
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* Copyright (C) 2009-2010 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/88pm860x.h>
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#include <linux/slab.h>
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#define PM8607_WAKEUP 0x0b
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#define LONG_ONKEY_EN (1 << 1)
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#define ONKEY_STATUS (1 << 0)
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struct pm860x_onkey_info {
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struct input_dev *idev;
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struct pm860x_chip *chip;
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struct i2c_client *i2c;
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struct device *dev;
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int irq;
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};
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/* 88PM860x gives us an interrupt when ONKEY is held */
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static irqreturn_t pm860x_onkey_handler(int irq, void *data)
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{
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struct pm860x_onkey_info *info = data;
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int ret;
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ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
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ret &= ONKEY_STATUS;
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input_report_key(info->idev, KEY_POWER, ret);
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input_sync(info->idev);
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/* Enable 8-second long onkey detection */
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pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
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return IRQ_HANDLED;
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}
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static int __devinit pm860x_onkey_probe(struct platform_device *pdev)
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{
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct pm860x_onkey_info *info;
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int irq, ret;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "No IRQ resource!\n");
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return -EINVAL;
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}
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info = kzalloc(sizeof(struct pm860x_onkey_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->chip = chip;
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info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
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info->dev = &pdev->dev;
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info->irq = irq;
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info->idev = input_allocate_device();
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if (!info->idev) {
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dev_err(chip->dev, "Failed to allocate input dev\n");
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ret = -ENOMEM;
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goto out;
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}
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info->idev->name = "88pm860x_on";
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info->idev->phys = "88pm860x_on/input0";
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info->idev->id.bustype = BUS_I2C;
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info->idev->dev.parent = &pdev->dev;
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info->idev->evbit[0] = BIT_MASK(EV_KEY);
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info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
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ret = input_register_device(info->idev);
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if (ret) {
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dev_err(chip->dev, "Can't register input device: %d\n", ret);
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goto out_reg;
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}
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ret = request_threaded_irq(info->irq, NULL, pm860x_onkey_handler,
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IRQF_ONESHOT, "onkey", info);
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if (ret < 0) {
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dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
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info->irq, ret);
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goto out_irq;
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}
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platform_set_drvdata(pdev, info);
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return 0;
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out_irq:
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input_unregister_device(info->idev);
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kfree(info);
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return ret;
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out_reg:
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input_free_device(info->idev);
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out:
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kfree(info);
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return ret;
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}
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static int __devexit pm860x_onkey_remove(struct platform_device *pdev)
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{
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struct pm860x_onkey_info *info = platform_get_drvdata(pdev);
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free_irq(info->irq, info);
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input_unregister_device(info->idev);
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kfree(info);
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return 0;
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}
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static struct platform_driver pm860x_onkey_driver = {
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.driver = {
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.name = "88pm860x-onkey",
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.owner = THIS_MODULE,
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},
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.probe = pm860x_onkey_probe,
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.remove = __devexit_p(pm860x_onkey_remove),
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};
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static int __init pm860x_onkey_init(void)
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{
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return platform_driver_register(&pm860x_onkey_driver);
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}
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module_init(pm860x_onkey_init);
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static void __exit pm860x_onkey_exit(void)
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{
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platform_driver_unregister(&pm860x_onkey_driver);
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}
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module_exit(pm860x_onkey_exit);
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MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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