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

   1/**
   2 * CPCAP Power Button Input Driver
   3 *
   4 * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org>
   5 *
   6 * This file is subject to the terms and conditions of the GNU General
   7 * Public License. See the file "COPYING" in the main directory of this
   8 * archive for more details.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/init.h>
  18#include <linux/kernel.h>
  19#include <linux/errno.h>
  20#include <linux/input.h>
  21#include <linux/interrupt.h>
  22#include <linux/regmap.h>
  23#include <linux/of.h>
  24#include <linux/platform_device.h>
  25#include <linux/mfd/motorola-cpcap.h>
  26
  27#define CPCAP_IRQ_ON 23
  28#define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16))
  29
  30struct cpcap_power_button {
  31        struct regmap *regmap;
  32        struct input_dev *idev;
  33        struct device *dev;
  34};
  35
  36static irqreturn_t powerbutton_irq(int irq, void *_button)
  37{
  38        struct cpcap_power_button *button = _button;
  39        int val;
  40
  41        val = cpcap_sense_virq(button->regmap, irq);
  42        if (val < 0) {
  43                dev_err(button->dev, "irq read failed: %d", val);
  44                return IRQ_HANDLED;
  45        }
  46
  47        pm_wakeup_event(button->dev, 0);
  48        input_report_key(button->idev, KEY_POWER, val);
  49        input_sync(button->idev);
  50
  51        return IRQ_HANDLED;
  52}
  53
  54static int cpcap_power_button_probe(struct platform_device *pdev)
  55{
  56        struct cpcap_power_button *button;
  57        int irq = platform_get_irq(pdev, 0);
  58        int err;
  59
  60        button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
  61        if (!button)
  62                return -ENOMEM;
  63
  64        button->idev = devm_input_allocate_device(&pdev->dev);
  65        if (!button->idev)
  66                return -ENOMEM;
  67
  68        button->regmap = dev_get_regmap(pdev->dev.parent, NULL);
  69        if (!button->regmap)
  70                return -ENODEV;
  71
  72        button->dev = &pdev->dev;
  73
  74        button->idev->name = "cpcap-pwrbutton";
  75        button->idev->phys = "cpcap-pwrbutton/input0";
  76        button->idev->dev.parent = button->dev;
  77        input_set_capability(button->idev, EV_KEY, KEY_POWER);
  78
  79        err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
  80                powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button);
  81        if (err < 0) {
  82                dev_err(&pdev->dev, "IRQ request failed: %d\n", err);
  83                return err;
  84        }
  85
  86        err = input_register_device(button->idev);
  87        if (err) {
  88                dev_err(&pdev->dev, "Input register failed: %d\n", err);
  89                return err;
  90        }
  91
  92        device_init_wakeup(&pdev->dev, true);
  93
  94        return 0;
  95}
  96
  97#ifdef CONFIG_OF
  98static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = {
  99        { .compatible = "motorola,cpcap-pwrbutton" },
 100        {},
 101};
 102MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table);
 103#endif
 104
 105static struct platform_driver cpcap_power_button_driver = {
 106        .probe          = cpcap_power_button_probe,
 107        .driver         = {
 108                .name   = "cpcap-pwrbutton",
 109                .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table),
 110        },
 111};
 112module_platform_driver(cpcap_power_button_driver);
 113
 114MODULE_ALIAS("platform:cpcap-pwrbutton");
 115MODULE_DESCRIPTION("CPCAP Power Button");
 116MODULE_LICENSE("GPL");
 117MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>");
 118