Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/input/misc/twl4030-pwrbutton.c

  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/i2c/twl.h>
 31 
 32 #define PWR_PWRON_IRQ (1 << 0)
 33 
 34 #define STS_HW_CONDITIONS 0xf
 35 
 36 static 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 
 55 static 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         pwr->evbit[0] = BIT_MASK(EV_KEY);
 68         pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
 69         pwr->name = "twl4030_pwrbutton";
 70         pwr->phys = "twl4030_pwrbutton/input0";
 71         pwr->dev.parent = &pdev->dev;
 72 
 73         err = devm_request_threaded_irq(&pwr->dev, irq, NULL, powerbutton_irq,
 74                         IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 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         platform_set_drvdata(pdev, pwr);
 88 
 89         return 0;
 90 }
 91 
 92 #ifdef CONFIG_OF
 93 static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = {
 94        { .compatible = "ti,twl4030-pwrbutton" },
 95        {},
 96 };
 97 MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table);
 98 #endif
 99 
100 static struct platform_driver twl4030_pwrbutton_driver = {
101         .probe          = twl4030_pwrbutton_probe,
102         .driver         = {
103                 .name   = "twl4030_pwrbutton",
104                 .owner  = THIS_MODULE,
105                 .of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table),
106         },
107 };
108 module_platform_driver(twl4030_pwrbutton_driver);
109 
110 MODULE_ALIAS("platform:twl4030_pwrbutton");
111 MODULE_DESCRIPTION("Triton2 Power Button");
112 MODULE_LICENSE("GPL");
113 MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
114 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
115 
116 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us