drivers/input/misc/88pm886-onkey.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/input.h>
   3 #include <linux/interrupt.h>
   4 #include <linux/irq.h>
   5 #include <linux/platform_device.h>
   6 #include <linux/regmap.h>
   7
   8 #include <linux/mfd/88pm886.h>
   9
  10 struct pm886_onkey {
  11         struct input_dev *idev;
  12         struct pm886_chip *chip;
  13 };
  14
  15 static irqreturn_t pm886_onkey_irq_handler(int irq, void *data)
  16 {
  17         struct pm886_onkey *onkey = data;
  18         struct regmap *regmap = onkey->chip->regmap;
  19         struct input_dev *idev = onkey->idev;
  20         struct device *parent = idev->dev.parent;
  21         unsigned int val;
  22         int err;
  23
  24         err = regmap_read(regmap, PM886_REG_STATUS1, &val);
  25         if (err) {
  26                 dev_err(parent, "Failed to read status: %d\n", err);
  27                 return IRQ_NONE;
  28         }
  29         val &= PM886_ONKEY_STS1;
  30
  31         input_report_key(idev, KEY_POWER, val);
  32         input_sync(idev);
  33
  34         return IRQ_HANDLED;
  35 }
  36
  37 static int pm886_onkey_probe(struct platform_device *pdev)
  38 {
  39         struct pm886_chip *chip = dev_get_drvdata(pdev->dev.parent);
  40         struct device *dev = &pdev->dev;
  41         struct pm886_onkey *onkey;
  42         struct input_dev *idev;
  43         int irq, err;
  44
  45         onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
  46         if (!onkey)
  47                 return -ENOMEM;
  48
  49         onkey->chip = chip;
  50
  51         irq = platform_get_irq(pdev, 0);
  52         if (irq < 0)
  53                 return dev_err_probe(dev, irq, "Failed to get IRQ\n");
  54
  55         idev = devm_input_allocate_device(dev);
  56         if (!idev) {
  57                 dev_err(dev, "Failed to allocate input device\n");
  58                 return -ENOMEM;
  59         }
  60         onkey->idev = idev;
  61
  62         idev->name = "88pm886-onkey";
  63         idev->phys = "88pm886-onkey/input0";
  64         idev->id.bustype = BUS_I2C;
  65
  66         input_set_capability(idev, EV_KEY, KEY_POWER);
  67
  68         err = devm_request_threaded_irq(dev, irq, NULL, pm886_onkey_irq_handler,
  69                                         IRQF_ONESHOT | IRQF_NO_SUSPEND, "onkey",
  70                                         onkey);
  71         if (err)
  72                 return dev_err_probe(dev, err, "Failed to request IRQ\n");
  73
  74         err = input_register_device(idev);
  75         if (err)
  76                 return dev_err_probe(dev, err, "Failed to register input device\n");
  77
  78         return 0;
  79 }
  80
  81 static const struct platform_device_id pm886_onkey_id_table[] = {
  82         { "88pm886-onkey", },
  83         { }
  84 };
  85 MODULE_DEVICE_TABLE(platform, pm886_onkey_id_table);
  86
  87 static struct platform_driver pm886_onkey_driver = {
  88         .driver = {
  89                 .name = "88pm886-onkey",
  90         },
  91         .probe = pm886_onkey_probe,
  92         .id_table = pm886_onkey_id_table,
  93 };
  94 module_platform_driver(pm886_onkey_driver);
  95
  96 MODULE_DESCRIPTION("Marvell 88PM886 onkey driver");
  97 MODULE_AUTHOR("Karel Balej <balejk@matfyz.cz>");
  98 MODULE_LICENSE("GPL");