cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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twl4030-pwrbutton.c (3240B)

      1/**
      2 * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
      3 *
      4 * Copyright (C) 2008-2009 Nokia Corporation
      5 *
      6 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
      7 * Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
      8 *
      9 * This file is subject to the terms and conditions of the GNU General
     10 * Public License. See the file "COPYING" in the main directory of this
     11 * archive for more details.
     12 *
     13 * This program is distributed in the hope that it will be useful,
     14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     16 * GNU General Public License for more details.
     17 *
     18 * You should have received a copy of the GNU General Public License
     19 * along with this program; if not, write to the Free Software
     20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     21 */
     22
     23#include <linux/module.h>
     24#include <linux/init.h>
     25#include <linux/kernel.h>
     26#include <linux/errno.h>
     27#include <linux/input.h>
     28#include <linux/interrupt.h>
     29#include <linux/platform_device.h>
     30#include <linux/mfd/twl.h>
     31
     32#define PWR_PWRON_IRQ (1 << 0)
     33
     34#define STS_HW_CONDITIONS 0xf
     35
     36static irqreturn_t powerbutton_irq(int irq, void *_pwr)
     37{
     38	struct input_dev *pwr = _pwr;
     39	int err;
     40	u8 value;
     41
     42	err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS);
     43	if (!err)  {
     44		pm_wakeup_event(pwr->dev.parent, 0);
     45		input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
     46		input_sync(pwr);
     47	} else {
     48		dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
     49			" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
     50	}
     51
     52	return IRQ_HANDLED;
     53}
     54
     55static int twl4030_pwrbutton_probe(struct platform_device *pdev)
     56{
     57	struct input_dev *pwr;
     58	int irq = platform_get_irq(pdev, 0);
     59	int err;
     60
     61	pwr = devm_input_allocate_device(&pdev->dev);
     62	if (!pwr) {
     63		dev_err(&pdev->dev, "Can't allocate power button\n");
     64		return -ENOMEM;
     65	}
     66
     67	input_set_capability(pwr, EV_KEY, KEY_POWER);
     68	pwr->name = "twl4030_pwrbutton";
     69	pwr->phys = "twl4030_pwrbutton/input0";
     70	pwr->dev.parent = &pdev->dev;
     71
     72	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq,
     73			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
     74			IRQF_ONESHOT,
     75			"twl4030_pwrbutton", pwr);
     76	if (err < 0) {
     77		dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
     78		return err;
     79	}
     80
     81	err = input_register_device(pwr);
     82	if (err) {
     83		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
     84		return err;
     85	}
     86
     87	device_init_wakeup(&pdev->dev, true);
     88
     89	return 0;
     90}
     91
     92#ifdef CONFIG_OF
     93static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = {
     94       { .compatible = "ti,twl4030-pwrbutton" },
     95       {},
     96};
     97MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table);
     98#endif
     99
    100static struct platform_driver twl4030_pwrbutton_driver = {
    101	.probe		= twl4030_pwrbutton_probe,
    102	.driver		= {
    103		.name	= "twl4030_pwrbutton",
    104		.of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table),
    105	},
    106};
    107module_platform_driver(twl4030_pwrbutton_driver);
    108
    109MODULE_ALIAS("platform:twl4030_pwrbutton");
    110MODULE_DESCRIPTION("Triton2 Power Button");
    111MODULE_LICENSE("GPL");
    112MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
    113MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
    114