146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/**
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* twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
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* Several fixes by Felipe Balbi <felipe.balbi@nokia.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/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/i2c/twl4030.h>
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#define PWR_PWRON_IRQ (1 << 0)
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#define STS_HW_CONDITIONS 0xf
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static irqreturn_t powerbutton_irq(int irq, void *_pwr)
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{
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struct input_dev *pwr = _pwr;
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int err;
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u8 value;
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#ifdef CONFIG_LOCKDEP
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/* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
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* we don't want and can't tolerate since this is a threaded
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* IRQ and can sleep due to the i2c reads it has to issue.
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* Although it might be friendlier not to borrow this thread
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* context...
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*/
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local_irq_enable();
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#endif
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err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
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STS_HW_CONDITIONS);
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if (!err) {
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input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
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input_sync(pwr);
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} else {
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dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
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" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
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}
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return IRQ_HANDLED;
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}
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static int __devinit twl4030_pwrbutton_probe(struct platform_device *pdev)
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{
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struct input_dev *pwr;
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int irq = platform_get_irq(pdev, 0);
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int err;
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pwr = input_allocate_device();
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if (!pwr) {
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dev_dbg(&pdev->dev, "Can't allocate power button\n");
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return -ENOMEM;
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}
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pwr->evbit[0] = BIT_MASK(EV_KEY);
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pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
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pwr->name = "twl4030_pwrbutton";
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pwr->phys = "twl4030_pwrbutton/input0";
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pwr->dev.parent = &pdev->dev;
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err = request_irq(irq, powerbutton_irq,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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"twl4030_pwrbutton", pwr);
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if (err < 0) {
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dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
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goto free_input_dev;
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}
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err = input_register_device(pwr);
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if (err) {
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dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
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goto free_irq;
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}
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platform_set_drvdata(pdev, pwr);
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return 0;
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free_irq:
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free_irq(irq, NULL);
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free_input_dev:
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input_free_device(pwr);
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return err;
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}
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static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev)
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{
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struct input_dev *pwr = platform_get_drvdata(pdev);
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int irq = platform_get_irq(pdev, 0);
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free_irq(irq, pwr);
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input_unregister_device(pwr);
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return 0;
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}
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struct platform_driver twl4030_pwrbutton_driver = {
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.probe = twl4030_pwrbutton_probe,
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.remove = __devexit_p(twl4030_pwrbutton_remove),
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.driver = {
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.name = "twl4030_pwrbutton",
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.owner = THIS_MODULE,
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},
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};
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static int __init twl4030_pwrbutton_init(void)
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{
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return platform_driver_register(&twl4030_pwrbutton_driver);
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}
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module_init(twl4030_pwrbutton_init);
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static void __exit twl4030_pwrbutton_exit(void)
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{
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platform_driver_unregister(&twl4030_pwrbutton_driver);
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}
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module_exit(twl4030_pwrbutton_exit);
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MODULE_ALIAS("platform:twl4030_pwrbutton");
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MODULE_DESCRIPTION("Triton2 Power Button");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
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MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
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