LXR linux/drivers/input/misc/tps65218-pwrbutton.c

   1/*
   2 * Texas Instruments' TPS65218 Power Button Input Driver
   3 *
   4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   5 * Author: Felipe Balbi <balbi@ti.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12 * kind, whether express or implied; without even the implied warranty
  13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 */
  16
  17#include <linux/init.h>
  18#include <linux/input.h>
  19#include <linux/interrupt.h>
  20#include <linux/kernel.h>
  21#include <linux/mfd/tps65218.h>
  22#include <linux/module.h>
  23#include <linux/of.h>
  24#include <linux/platform_device.h>
  25#include <linux/slab.h>
  26
  27struct tps65218_pwrbutton {
  28        struct device *dev;
  29        struct tps65218 *tps;
  30        struct input_dev *idev;
  31};
  32
  33static irqreturn_t tps65218_pwr_irq(int irq, void *_pwr)
  34{
  35        struct tps65218_pwrbutton *pwr = _pwr;
  36        unsigned int reg;
  37        int error;
  38
  39        error = tps65218_reg_read(pwr->tps, TPS65218_REG_STATUS, &reg);
  40        if (error) {
  41                dev_err(pwr->dev, "can't read register: %d\n", error);
  42                goto out;
  43        }
  44
  45        if (reg & TPS65218_STATUS_PB_STATE) {
  46                input_report_key(pwr->idev, KEY_POWER, 1);
  47                pm_wakeup_event(pwr->dev, 0);
  48        } else {
  49                input_report_key(pwr->idev, KEY_POWER, 0);
  50        }
  51
  52        input_sync(pwr->idev);
  53
  54out:
  55        return IRQ_HANDLED;
  56}
  57
  58static int tps65218_pwron_probe(struct platform_device *pdev)
  59{
  60        struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
  61        struct device *dev = &pdev->dev;
  62        struct tps65218_pwrbutton *pwr;
  63        struct input_dev *idev;
  64        int error;
  65        int irq;
  66
  67        pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
  68        if (!pwr)
  69                return -ENOMEM;
  70
  71        idev = devm_input_allocate_device(dev);
  72        if (!idev)
  73                return -ENOMEM;
  74
  75        idev->name = "tps65218_pwrbutton";
  76        idev->phys = "tps65218_pwrbutton/input0";
  77        idev->dev.parent = dev;
  78        idev->id.bustype = BUS_I2C;
  79
  80        input_set_capability(idev, EV_KEY, KEY_POWER);
  81
  82        pwr->tps = tps;
  83        pwr->dev = dev;
  84        pwr->idev = idev;
  85        platform_set_drvdata(pdev, pwr);
  86        device_init_wakeup(dev, true);
  87
  88        irq = platform_get_irq(pdev, 0);
  89        error = devm_request_threaded_irq(dev, irq, NULL, tps65218_pwr_irq,
  90                                          IRQF_TRIGGER_RISING |
  91                                                IRQF_TRIGGER_FALLING |
  92                                                IRQF_ONESHOT,
  93                                          "tps65218-pwrbutton", pwr);
  94        if (error) {
  95                dev_err(dev, "failed to request IRQ #%d: %d\n",
  96                        irq, error);
  97                return error;
  98        }
  99
 100        error= input_register_device(idev);
 101        if (error) {
 102                dev_err(dev, "Can't register power button: %d\n", error);
 103                return error;
 104        }
 105
 106        return 0;
 107}
 108
 109static const struct of_device_id of_tps65218_pwr_match[] = {
 110        { .compatible = "ti,tps65218-pwrbutton" },
 111        { },
 112};
 113MODULE_DEVICE_TABLE(of, of_tps65218_pwr_match);
 114
 115static struct platform_driver tps65218_pwron_driver = {
 116        .probe  = tps65218_pwron_probe,
 117        .driver = {
 118                .name   = "tps65218_pwrbutton",
 119                .of_match_table = of_tps65218_pwr_match,
 120        },
 121};
 122module_platform_driver(tps65218_pwron_driver);
 123
 124MODULE_DESCRIPTION("TPS65218 Power Button");
 125MODULE_LICENSE("GPL v2");
 126MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 127