drivers/input/misc/max77650-onkey.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (C) 2018 BayLibre SAS
   4 // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
   5 //
   6 // ONKEY driver for MAXIM 77650/77651 charger/power-supply.
   7
   8 #include <linux/i2c.h>
   9 #include <linux/input.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/mfd/max77650.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15
  16 #define MAX77650_ONKEY_MODE_MASK        BIT(3)
  17 #define MAX77650_ONKEY_MODE_PUSH        0x00
  18 #define MAX77650_ONKEY_MODE_SLIDE       BIT(3)
  19
  20 struct max77650_onkey {
  21         struct input_dev *input;
  22         unsigned int code;
  23 };
  24
  25 static irqreturn_t max77650_onkey_falling(int irq, void *data)
  26 {
  27         struct max77650_onkey *onkey = data;
  28
  29         input_report_key(onkey->input, onkey->code, 0);
  30         input_sync(onkey->input);
  31
  32         return IRQ_HANDLED;
  33 }
  34
  35 static irqreturn_t max77650_onkey_rising(int irq, void *data)
  36 {
  37         struct max77650_onkey *onkey = data;
  38
  39         input_report_key(onkey->input, onkey->code, 1);
  40         input_sync(onkey->input);
  41
  42         return IRQ_HANDLED;
  43 }
  44
  45 static int max77650_onkey_probe(struct platform_device *pdev)
  46 {
  47         int irq_r, irq_f, error, mode;
  48         struct max77650_onkey *onkey;
  49         struct device *dev, *parent;
  50         struct regmap *map;
  51         unsigned int type;
  52
  53         dev = &pdev->dev;
  54         parent = dev->parent;
  55
  56         map = dev_get_regmap(parent, NULL);
  57         if (!map)
  58                 return -ENODEV;
  59
  60         onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
  61         if (!onkey)
  62                 return -ENOMEM;
  63
  64         error = device_property_read_u32(dev, "linux,code", &onkey->code);
  65         if (error)
  66                 onkey->code = KEY_POWER;
  67
  68         if (device_property_read_bool(dev, "maxim,onkey-slide")) {
  69                 mode = MAX77650_ONKEY_MODE_SLIDE;
  70                 type = EV_SW;
  71         } else {
  72                 mode = MAX77650_ONKEY_MODE_PUSH;
  73                 type = EV_KEY;
  74         }
  75
  76         error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
  77                                    MAX77650_ONKEY_MODE_MASK, mode);
  78         if (error)
  79                 return error;
  80
  81         irq_f = platform_get_irq_byname(pdev, "nEN_F");
  82         if (irq_f < 0)
  83                 return irq_f;
  84
  85         irq_r = platform_get_irq_byname(pdev, "nEN_R");
  86         if (irq_r < 0)
  87                 return irq_r;
  88
  89         onkey->input = devm_input_allocate_device(dev);
  90         if (!onkey->input)
  91                 return -ENOMEM;
  92
  93         onkey->input->name = "max77650_onkey";
  94         onkey->input->phys = "max77650_onkey/input0";
  95         onkey->input->id.bustype = BUS_I2C;
  96         input_set_capability(onkey->input, type, onkey->code);
  97
  98         error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
  99                                              IRQF_ONESHOT, "onkey-down", onkey);
 100         if (error < 0)
 101                 return error;
 102
 103         error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
 104                                              IRQF_ONESHOT, "onkey-up", onkey);
 105         if (error < 0)
 106                 return error;
 107
 108         return input_register_device(onkey->input);
 109 }
 110
 111 static const struct of_device_id max77650_onkey_of_match[] = {
 112         { .compatible = "maxim,max77650-onkey" },
 113         { }
 114 };
 115 MODULE_DEVICE_TABLE(of, max77650_onkey_of_match);
 116
 117 static struct platform_driver max77650_onkey_driver = {
 118         .driver = {
 119                 .name = "max77650-onkey",
 120                 .of_match_table = max77650_onkey_of_match,
 121         },
 122         .probe = max77650_onkey_probe,
 123 };
 124 module_platform_driver(max77650_onkey_driver);
 125
 126 MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
 127 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
 128 MODULE_LICENSE("GPL v2");
 129 MODULE_ALIAS("platform:max77650-onkey");