drivers/input/misc/hisi_powerkey.c

   1 /*
   2  * Hisilicon PMIC powerkey driver
   3  *
   4  * Copyright (C) 2013 Hisilicon Ltd.
   5  * Copyright (C) 2015, 2016 Linaro Ltd.
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License. See the file "COPYING" in the main directory of this
   9  * archive for more details.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/platform_device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/reboot.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/of_irq.h>
  23 #include <linux/input.h>
  24 #include <linux/slab.h>
  25
  26 /* the held interrupt will trigger after 4 seconds */
  27 #define MAX_HELD_TIME   (4 * MSEC_PER_SEC)
  28
  29 static irqreturn_t hi65xx_power_press_isr(int irq, void *q)
  30 {
  31         struct input_dev *input = q;
  32
  33         pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
  34         input_report_key(input, KEY_POWER, 1);
  35         input_sync(input);
  36
  37         return IRQ_HANDLED;
  38 }
  39
  40 static irqreturn_t hi65xx_power_release_isr(int irq, void *q)
  41 {
  42         struct input_dev *input = q;
  43
  44         pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
  45         input_report_key(input, KEY_POWER, 0);
  46         input_sync(input);
  47
  48         return IRQ_HANDLED;
  49 }
  50
  51 static irqreturn_t hi65xx_restart_toggle_isr(int irq, void *q)
  52 {
  53         struct input_dev *input = q;
  54         int value = test_bit(KEY_RESTART, input->key);
  55
  56         pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
  57         input_report_key(input, KEY_RESTART, !value);
  58         input_sync(input);
  59
  60         return IRQ_HANDLED;
  61 }
  62
  63 static const struct {
  64         const char *name;
  65         irqreturn_t (*handler)(int irq, void *q);
  66 } hi65xx_irq_info[] = {
  67         { "down", hi65xx_power_press_isr },
  68         { "up", hi65xx_power_release_isr },
  69         { "hold 4s", hi65xx_restart_toggle_isr },
  70 };
  71
  72 static int hi65xx_powerkey_probe(struct platform_device *pdev)
  73 {
  74         struct device *dev = &pdev->dev;
  75         struct input_dev *input;
  76         int irq, i, error;
  77
  78         input = devm_input_allocate_device(dev);
  79         if (!input) {
  80                 dev_err(dev, "failed to allocate input device\n");
  81                 return -ENOMEM;
  82         }
  83
  84         input->phys = "hisi_on/input0";
  85         input->name = "HISI 65xx PowerOn Key";
  86
  87         input_set_capability(input, EV_KEY, KEY_POWER);
  88         input_set_capability(input, EV_KEY, KEY_RESTART);
  89
  90         for (i = 0; i < ARRAY_SIZE(hi65xx_irq_info); i++) {
  91
  92                 irq = platform_get_irq_byname(pdev, hi65xx_irq_info[i].name);
  93                 if (irq < 0) {
  94                         error = irq;
  95                         dev_err(dev, "couldn't get irq %s: %d\n",
  96                                 hi65xx_irq_info[i].name, error);
  97                         return error;
  98                 }
  99
 100                 error = devm_request_any_context_irq(dev, irq,
 101                                                      hi65xx_irq_info[i].handler,
 102                                                      IRQF_ONESHOT,
 103                                                      hi65xx_irq_info[i].name,
 104                                                      input);
 105                 if (error < 0) {
 106                         dev_err(dev, "couldn't request irq %s: %d\n",
 107                                 hi65xx_irq_info[i].name, error);
 108                         return error;
 109                 }
 110         }
 111
 112         error = input_register_device(input);
 113         if (error) {
 114                 dev_err(dev, "failed to register input device: %d\n", error);
 115                 return error;
 116         }
 117
 118         device_init_wakeup(dev, 1);
 119
 120         return 0;
 121 }
 122
 123 static struct platform_driver hi65xx_powerkey_driver = {
 124         .driver = {
 125                 .name = "hi65xx-powerkey",
 126         },
 127         .probe = hi65xx_powerkey_probe,
 128 };
 129 module_platform_driver(hi65xx_powerkey_driver);
 130
 131 MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
 132 MODULE_DESCRIPTION("Hisi PMIC Power key driver");
 133 MODULE_LICENSE("GPL v2");