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As the power button causes a wake from suspend, we need to register the event with the pm sustem to avoid racing with suspend. As the input event is reported in the interrupt handler, as simple pm_wakeup_event() is sufficient. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
137 lines
3.5 KiB
C
137 lines
3.5 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/twl.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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err = twl_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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pm_wakeup_event(pwr->dev.parent, 0);
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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 __init 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_threaded_irq(irq, NULL, 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, pwr);
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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 __exit 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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static struct platform_driver twl4030_pwrbutton_driver = {
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.remove = __exit_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_probe(&twl4030_pwrbutton_driver,
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twl4030_pwrbutton_probe);
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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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