148 lines
4 KiB
C
148 lines
4 KiB
C
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/*
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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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#include <linux/device.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 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 = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info),
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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 = devm_input_allocate_device(&pdev->dev);
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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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return -ENOMEM;
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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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return ret;
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}
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ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
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pm860x_onkey_handler, IRQF_ONESHOT,
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"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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return ret;
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}
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platform_set_drvdata(pdev, info);
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device_init_wakeup(&pdev->dev, 1);
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return 0;
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}
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static int __maybe_unused pm860x_onkey_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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if (device_may_wakeup(dev))
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chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
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return 0;
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}
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static int __maybe_unused pm860x_onkey_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
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if (device_may_wakeup(dev))
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chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
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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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.pm = &pm860x_onkey_pm_ops,
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},
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.probe = pm860x_onkey_probe,
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};
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module_platform_driver(pm860x_onkey_driver);
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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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