drivers/input/misc/stpmic1_onkey.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) STMicroelectronics 2018
   3 // Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.
   4
   5 #include <linux/input.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/mfd/stpmic1.h>
   8 #include <linux/module.h>
   9 #include <linux/of.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/property.h>
  12 #include <linux/regmap.h>
  13
  14 /**
  15  * struct stpmic1_onkey - OnKey data
  16  * @input_dev:          pointer to input device
  17  * @irq_falling:        irq that we are hooked on to
  18  * @irq_rising:         irq that we are hooked on to
  19  */
  20 struct stpmic1_onkey {
  21         struct input_dev *input_dev;
  22         int irq_falling;
  23         int irq_rising;
  24 };
  25
  26 static irqreturn_t onkey_falling_irq(int irq, void *ponkey)
  27 {
  28         struct stpmic1_onkey *onkey = ponkey;
  29         struct input_dev *input_dev = onkey->input_dev;
  30
  31         input_report_key(input_dev, KEY_POWER, 1);
  32         pm_wakeup_event(input_dev->dev.parent, 0);
  33         input_sync(input_dev);
  34
  35         return IRQ_HANDLED;
  36 }
  37
  38 static irqreturn_t onkey_rising_irq(int irq, void *ponkey)
  39 {
  40         struct stpmic1_onkey *onkey = ponkey;
  41         struct input_dev *input_dev = onkey->input_dev;
  42
  43         input_report_key(input_dev, KEY_POWER, 0);
  44         pm_wakeup_event(input_dev->dev.parent, 0);
  45         input_sync(input_dev);
  46
  47         return IRQ_HANDLED;
  48 }
  49
  50 static int stpmic1_onkey_probe(struct platform_device *pdev)
  51 {
  52         struct stpmic1 *pmic = dev_get_drvdata(pdev->dev.parent);
  53         struct device *dev = &pdev->dev;
  54         struct input_dev *input_dev;
  55         struct stpmic1_onkey *onkey;
  56         unsigned int val, reg = 0;
  57         int error;
  58
  59         onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
  60         if (!onkey)
  61                 return -ENOMEM;
  62
  63         onkey->irq_falling = platform_get_irq_byname(pdev, "onkey-falling");
  64         if (onkey->irq_falling < 0) {
  65                 dev_err(dev, "failed: request IRQ onkey-falling %d\n",
  66                         onkey->irq_falling);
  67                 return onkey->irq_falling;
  68         }
  69
  70         onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
  71         if (onkey->irq_rising < 0) {
  72                 dev_err(dev, "failed: request IRQ onkey-rising %d\n",
  73                         onkey->irq_rising);
  74                 return onkey->irq_rising;
  75         }
  76
  77         if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
  78                 if (val > 0 && val <= 16) {
  79                         dev_dbg(dev, "power-off-time=%d seconds\n", val);
  80                         reg |= PONKEY_PWR_OFF;
  81                         reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
  82                 } else {
  83                         dev_err(dev, "power-off-time-sec out of range\n");
  84                         return -EINVAL;
  85                 }
  86         }
  87
  88         if (device_property_present(dev, "st,onkey-clear-cc-flag"))
  89                 reg |= PONKEY_CC_FLAG_CLEAR;
  90
  91         error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
  92                                    PONKEY_TURNOFF_MASK, reg);
  93         if (error) {
  94                 dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
  95                 return error;
  96         }
  97
  98         if (device_property_present(dev, "st,onkey-pu-inactive")) {
  99                 error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
 100                                            PONKEY_PU_INACTIVE,
 101                                            PONKEY_PU_INACTIVE);
 102                 if (error) {
 103                         dev_err(dev, "ONKEY Pads configuration failed: %d\n",
 104                                 error);
 105                         return error;
 106                 }
 107         }
 108
 109         input_dev = devm_input_allocate_device(dev);
 110         if (!input_dev) {
 111                 dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
 112                 return -ENOMEM;
 113         }
 114
 115         input_dev->name = "pmic_onkey";
 116         input_dev->phys = "pmic_onkey/input0";
 117
 118         input_set_capability(input_dev, EV_KEY, KEY_POWER);
 119
 120         onkey->input_dev = input_dev;
 121
 122         /* interrupt is nested in a thread */
 123         error = devm_request_threaded_irq(dev, onkey->irq_falling, NULL,
 124                                           onkey_falling_irq, IRQF_ONESHOT,
 125                                           dev_name(dev), onkey);
 126         if (error) {
 127                 dev_err(dev, "Can't get IRQ Onkey Falling: %d\n", error);
 128                 return error;
 129         }
 130
 131         error = devm_request_threaded_irq(dev, onkey->irq_rising, NULL,
 132                                           onkey_rising_irq, IRQF_ONESHOT,
 133                                           dev_name(dev), onkey);
 134         if (error) {
 135                 dev_err(dev, "Can't get IRQ Onkey Rising: %d\n", error);
 136                 return error;
 137         }
 138
 139         error = input_register_device(input_dev);
 140         if (error) {
 141                 dev_err(dev, "Can't register power button: %d\n", error);
 142                 return error;
 143         }
 144
 145         platform_set_drvdata(pdev, onkey);
 146         device_init_wakeup(dev, true);
 147
 148         return 0;
 149 }
 150
 151 static int __maybe_unused stpmic1_onkey_suspend(struct device *dev)
 152 {
 153         struct platform_device *pdev = to_platform_device(dev);
 154         struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
 155
 156         if (device_may_wakeup(dev)) {
 157                 enable_irq_wake(onkey->irq_falling);
 158                 enable_irq_wake(onkey->irq_rising);
 159         }
 160         return 0;
 161 }
 162
 163 static int __maybe_unused stpmic1_onkey_resume(struct device *dev)
 164 {
 165         struct platform_device *pdev = to_platform_device(dev);
 166         struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
 167
 168         if (device_may_wakeup(dev)) {
 169                 disable_irq_wake(onkey->irq_falling);
 170                 disable_irq_wake(onkey->irq_rising);
 171         }
 172         return 0;
 173 }
 174
 175 static SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
 176                          stpmic1_onkey_suspend,
 177                          stpmic1_onkey_resume);
 178
 179 static const struct of_device_id of_stpmic1_onkey_match[] = {
 180         { .compatible = "st,stpmic1-onkey" },
 181         { },
 182 };
 183
 184 MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);
 185
 186 static struct platform_driver stpmic1_onkey_driver = {
 187         .probe  = stpmic1_onkey_probe,
 188         .driver = {
 189                 .name   = "stpmic1_onkey",
 190                 .of_match_table = of_match_ptr(of_stpmic1_onkey_match),
 191                 .pm     = &stpmic1_onkey_pm,
 192         },
 193 };
 194 module_platform_driver(stpmic1_onkey_driver);
 195
 196 MODULE_DESCRIPTION("Onkey driver for STPMIC1");
 197 MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
 198 MODULE_LICENSE("GPL v2");