input/misc/twl4030-pwrbutton.c

0001 /**
0002  * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
0003  *
0004  * Copyright (C) 2008-2009 Nokia Corporation
0005  *
0006  * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
0007  * Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
0008  *
0009  * This file is subject to the terms and conditions of the GNU General
0010  * Public License. See the file "COPYING" in the main directory of this
0011  * archive for more details.
0012  *
0013  * This program is distributed in the hope that it will be useful,
0014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
0015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0016  * GNU General Public License for more details.
0017  *
0018  * You should have received a copy of the GNU General Public License
0019  * along with this program; if not, write to the Free Software
0020  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
0021  */
0022
0023 #include <linux/module.h>
0024 #include <linux/init.h>
0025 #include <linux/kernel.h>
0026 #include <linux/errno.h>
0027 #include <linux/input.h>
0028 #include <linux/interrupt.h>
0029 #include <linux/platform_device.h>
0030 #include <linux/mfd/twl.h>
0031
0032 #define PWR_PWRON_IRQ (1 << 0)
0033
0034 #define STS_HW_CONDITIONS 0xf
0035
0036 static irqreturn_t powerbutton_irq(int irq, void *_pwr)
0037 {
0038     struct input_dev *pwr = _pwr;
0039     int err;
0040     u8 value;
0041
0042     err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &value, STS_HW_CONDITIONS);
0043     if (!err)  {
0044         pm_wakeup_event(pwr->dev.parent, 0);
0045         input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
0046         input_sync(pwr);
0047     } else {
0048         dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
0049             " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
0050     }
0051
0052     return IRQ_HANDLED;
0053 }
0054
0055 static int twl4030_pwrbutton_probe(struct platform_device *pdev)
0056 {
0057     struct input_dev *pwr;
0058     int irq = platform_get_irq(pdev, 0);
0059     int err;
0060
0061     pwr = devm_input_allocate_device(&pdev->dev);
0062     if (!pwr) {
0063         dev_err(&pdev->dev, "Can't allocate power button\n");
0064         return -ENOMEM;
0065     }
0066
0067     input_set_capability(pwr, EV_KEY, KEY_POWER);
0068     pwr->name = "twl4030_pwrbutton";
0069     pwr->phys = "twl4030_pwrbutton/input0";
0070     pwr->dev.parent = &pdev->dev;
0071
0072     err = devm_request_threaded_irq(&pdev->dev, irq, NULL, powerbutton_irq,
0073             IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
0074             IRQF_ONESHOT,
0075             "twl4030_pwrbutton", pwr);
0076     if (err < 0) {
0077         dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
0078         return err;
0079     }
0080
0081     err = input_register_device(pwr);
0082     if (err) {
0083         dev_err(&pdev->dev, "Can't register power button: %d\n", err);
0084         return err;
0085     }
0086
0087     device_init_wakeup(&pdev->dev, true);
0088
0089     return 0;
0090 }
0091
0092 #ifdef CONFIG_OF
0093 static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = {
0094        { .compatible = "ti,twl4030-pwrbutton" },
0095        {},
0096 };
0097 MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table);
0098 #endif
0099
0100 static struct platform_driver twl4030_pwrbutton_driver = {
0101     .probe      = twl4030_pwrbutton_probe,
0102     .driver     = {
0103         .name   = "twl4030_pwrbutton",
0104         .of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table),
0105     },
0106 };
0107 module_platform_driver(twl4030_pwrbutton_driver);
0108
0109 MODULE_ALIAS("platform:twl4030_pwrbutton");
0110 MODULE_DESCRIPTION("Triton2 Power Button");
0111 MODULE_LICENSE("GPL");
0112 MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
0113 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
0114