149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
/**
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* max8925_onkey.c - MAX8925 ONKEY driver
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*
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* Copyright (C) 2009 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/max8925.h>
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#include <linux/slab.h>
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#define HARDRESET_EN (1 << 7)
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#define PWREN_EN (1 << 7)
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struct max8925_onkey_info {
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struct input_dev *idev;
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struct i2c_client *i2c;
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int irq;
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};
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/*
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* MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
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* max8925_set_bits() operates I2C bus and may sleep. So implement
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* it in thread IRQ handler.
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*/
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static irqreturn_t max8925_onkey_handler(int irq, void *data)
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{
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struct max8925_onkey_info *info = data;
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input_report_key(info->idev, KEY_POWER, 1);
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input_sync(info->idev);
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/* Enable hardreset to halt if system isn't shutdown on time */
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max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
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HARDRESET_EN, HARDRESET_EN);
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return IRQ_HANDLED;
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}
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static int __devinit max8925_onkey_probe(struct platform_device *pdev)
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{
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struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
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struct max8925_onkey_info *info;
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int error;
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info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->i2c = chip->i2c;
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info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;
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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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error = -ENOMEM;
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goto out_input;
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}
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info->idev->name = "max8925_on";
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info->idev->phys = "max8925_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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error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler,
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IRQF_ONESHOT, "onkey", info);
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if (error < 0) {
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dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
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info->irq, error);
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goto out_irq;
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}
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error = input_register_device(info->idev);
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if (error) {
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dev_err(chip->dev, "Can't register input device: %d\n", error);
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goto out;
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}
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platform_set_drvdata(pdev, info);
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return 0;
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out:
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free_irq(info->irq, info);
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out_irq:
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input_free_device(info->idev);
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out_input:
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kfree(info);
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return error;
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}
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static int __devexit max8925_onkey_remove(struct platform_device *pdev)
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{
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struct max8925_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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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver max8925_onkey_driver = {
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.driver = {
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.name = "max8925-onkey",
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.owner = THIS_MODULE,
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},
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.probe = max8925_onkey_probe,
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.remove = __devexit_p(max8925_onkey_remove),
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};
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static int __init max8925_onkey_init(void)
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{
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return platform_driver_register(&max8925_onkey_driver);
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}
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module_init(max8925_onkey_init);
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static void __exit max8925_onkey_exit(void)
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{
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platform_driver_unregister(&max8925_onkey_driver);
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}
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module_exit(max8925_onkey_exit);
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MODULE_DESCRIPTION("Maxim MAX8925 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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