drivers/input/misc/tps65218-pwrbutton.c

   1 /*
   2  * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
   3  *
   4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   5  * Author: Felipe Balbi <balbi@ti.com>
   6  * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/input.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mfd/tps65217.h>
  23 #include <linux/mfd/tps65218.h>
  24 #include <linux/module.h>
  25 #include <linux/of.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/regmap.h>
  28 #include <linux/slab.h>
  29
  30 struct tps6521x_data {
  31         unsigned int reg_status;
  32         unsigned int pb_mask;
  33         const char *name;
  34 };
  35
  36 static const struct tps6521x_data tps65217_data = {
  37         .reg_status = TPS65217_REG_STATUS,
  38         .pb_mask = TPS65217_STATUS_PB,
  39         .name = "tps65217_pwrbutton",
  40 };
  41
  42 static const struct tps6521x_data tps65218_data = {
  43         .reg_status = TPS65218_REG_STATUS,
  44         .pb_mask = TPS65218_STATUS_PB_STATE,
  45         .name = "tps65218_pwrbutton",
  46 };
  47
  48 struct tps6521x_pwrbutton {
  49         struct device *dev;
  50         struct regmap *regmap;
  51         struct input_dev *idev;
  52         const struct tps6521x_data *data;
  53         char phys[32];
  54 };
  55
  56 static const struct of_device_id of_tps6521x_pb_match[] = {
  57         { .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
  58         { .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
  59         { },
  60 };
  61 MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
  62
  63 static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
  64 {
  65         struct tps6521x_pwrbutton *pwr = _pwr;
  66         const struct tps6521x_data *tps_data = pwr->data;
  67         unsigned int reg;
  68         int error;
  69
  70         error = regmap_read(pwr->regmap, tps_data->reg_status, &reg);
  71         if (error) {
  72                 dev_err(pwr->dev, "can't read register: %d\n", error);
  73                 goto out;
  74         }
  75
  76         if (reg & tps_data->pb_mask) {
  77                 input_report_key(pwr->idev, KEY_POWER, 1);
  78                 pm_wakeup_event(pwr->dev, 0);
  79         } else {
  80                 input_report_key(pwr->idev, KEY_POWER, 0);
  81         }
  82
  83         input_sync(pwr->idev);
  84
  85 out:
  86         return IRQ_HANDLED;
  87 }
  88
  89 static int tps6521x_pb_probe(struct platform_device *pdev)
  90 {
  91         struct device *dev = &pdev->dev;
  92         struct tps6521x_pwrbutton *pwr;
  93         struct input_dev *idev;
  94         const struct of_device_id *match;
  95         int error;
  96         int irq;
  97
  98         match = of_match_node(of_tps6521x_pb_match, pdev->dev.of_node);
  99         if (!match)
 100                 return -ENXIO;
 101
 102         pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
 103         if (!pwr)
 104                 return -ENOMEM;
 105
 106         pwr->data = match->data;
 107
 108         idev = devm_input_allocate_device(dev);
 109         if (!idev)
 110                 return -ENOMEM;
 111
 112         idev->name = pwr->data->name;
 113         snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
 114                 pwr->data->name);
 115         idev->phys = pwr->phys;
 116         idev->dev.parent = dev;
 117         idev->id.bustype = BUS_I2C;
 118
 119         input_set_capability(idev, EV_KEY, KEY_POWER);
 120
 121         pwr->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 122         pwr->dev = dev;
 123         pwr->idev = idev;
 124         platform_set_drvdata(pdev, pwr);
 125         device_init_wakeup(dev, true);
 126
 127         irq = platform_get_irq(pdev, 0);
 128         if (irq < 0) {
 129                 dev_err(dev, "No IRQ resource!\n");
 130                 return -EINVAL;
 131         }
 132
 133         error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
 134                                           IRQF_TRIGGER_RISING |
 135                                                 IRQF_TRIGGER_FALLING |
 136                                                 IRQF_ONESHOT,
 137                                           pwr->data->name, pwr);
 138         if (error) {
 139                 dev_err(dev, "failed to request IRQ #%d: %d\n",
 140                         irq, error);
 141                 return error;
 142         }
 143
 144         error= input_register_device(idev);
 145         if (error) {
 146                 dev_err(dev, "Can't register power button: %d\n", error);
 147                 return error;
 148         }
 149
 150         return 0;
 151 }
 152
 153 static struct platform_driver tps6521x_pb_driver = {
 154         .probe  = tps6521x_pb_probe,
 155         .driver = {
 156                 .name   = "tps6521x_pwrbutton",
 157                 .of_match_table = of_tps6521x_pb_match,
 158         },
 159 };
 160 module_platform_driver(tps6521x_pb_driver);
 161
 162 MODULE_DESCRIPTION("TPS6521X Power Button");
 163 MODULE_LICENSE("GPL v2");
 164 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");