drivers/input/misc/tps65218-pwrbutton.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
   4  *
   5  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   6  * Author: Felipe Balbi <balbi@ti.com>
   7  * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/input.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mfd/tps65217.h>
  15 #include <linux/mfd/tps65218.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/slab.h>
  21
  22 struct tps6521x_data {
  23         unsigned int reg_status;
  24         unsigned int pb_mask;
  25         const char *name;
  26 };
  27
  28 static const struct tps6521x_data tps65217_data = {
  29         .reg_status = TPS65217_REG_STATUS,
  30         .pb_mask = TPS65217_STATUS_PB,
  31         .name = "tps65217_pwrbutton",
  32 };
  33
  34 static const struct tps6521x_data tps65218_data = {
  35         .reg_status = TPS65218_REG_STATUS,
  36         .pb_mask = TPS65218_STATUS_PB_STATE,
  37         .name = "tps65218_pwrbutton",
  38 };
  39
  40 struct tps6521x_pwrbutton {
  41         struct device *dev;
  42         struct regmap *regmap;
  43         struct input_dev *idev;
  44         const struct tps6521x_data *data;
  45         char phys[32];
  46 };
  47
  48 static const struct of_device_id of_tps6521x_pb_match[] = {
  49         { .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
  50         { .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
  51         { },
  52 };
  53 MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
  54
  55 static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
  56 {
  57         struct tps6521x_pwrbutton *pwr = _pwr;
  58         const struct tps6521x_data *tps_data = pwr->data;
  59         unsigned int reg;
  60         int error;
  61
  62         error = regmap_read(pwr->regmap, tps_data->reg_status, &reg);
  63         if (error) {
  64                 dev_err(pwr->dev, "can't read register: %d\n", error);
  65                 goto out;
  66         }
  67
  68         if (reg & tps_data->pb_mask) {
  69                 input_report_key(pwr->idev, KEY_POWER, 1);
  70                 pm_wakeup_event(pwr->dev, 0);
  71         } else {
  72                 input_report_key(pwr->idev, KEY_POWER, 0);
  73         }
  74
  75         input_sync(pwr->idev);
  76
  77 out:
  78         return IRQ_HANDLED;
  79 }
  80
  81 static int tps6521x_pb_probe(struct platform_device *pdev)
  82 {
  83         struct device *dev = &pdev->dev;
  84         struct tps6521x_pwrbutton *pwr;
  85         struct input_dev *idev;
  86         const struct of_device_id *match;
  87         int error;
  88         int irq;
  89
  90         match = of_match_node(of_tps6521x_pb_match, dev->of_node);
  91         if (!match)
  92                 return -ENXIO;
  93
  94         pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
  95         if (!pwr)
  96                 return -ENOMEM;
  97
  98         pwr->data = match->data;
  99
 100         idev = devm_input_allocate_device(dev);
 101         if (!idev)
 102                 return -ENOMEM;
 103
 104         idev->name = pwr->data->name;
 105         snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
 106                 pwr->data->name);
 107         idev->phys = pwr->phys;
 108         idev->dev.parent = dev;
 109         idev->id.bustype = BUS_I2C;
 110
 111         input_set_capability(idev, EV_KEY, KEY_POWER);
 112
 113         pwr->regmap = dev_get_regmap(dev->parent, NULL);
 114         pwr->dev = dev;
 115         pwr->idev = idev;
 116         device_init_wakeup(dev, true);
 117
 118         irq = platform_get_irq(pdev, 0);
 119         if (irq < 0)
 120                 return -EINVAL;
 121
 122         error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
 123                                           IRQF_TRIGGER_RISING |
 124                                                 IRQF_TRIGGER_FALLING |
 125                                                 IRQF_ONESHOT,
 126                                           pwr->data->name, pwr);
 127         if (error) {
 128                 dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error);
 129                 return error;
 130         }
 131
 132         error= input_register_device(idev);
 133         if (error) {
 134                 dev_err(dev, "Can't register power button: %d\n", error);
 135                 return error;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
 142         { "tps65218-pwrbutton", },
 143         { "tps65217-pwrbutton", },
 144         { /* sentinel */ }
 145 };
 146 MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
 147
 148 static struct platform_driver tps6521x_pb_driver = {
 149         .probe  = tps6521x_pb_probe,
 150         .driver = {
 151                 .name   = "tps6521x_pwrbutton",
 152                 .of_match_table = of_tps6521x_pb_match,
 153         },
 154         .id_table = tps6521x_pwrbtn_id_table,
 155 };
 156 module_platform_driver(tps6521x_pb_driver);
 157
 158 MODULE_DESCRIPTION("TPS6521X Power Button");
 159 MODULE_LICENSE("GPL v2");
 160 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");