LXR linux/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
  30struct tps6521x_data {
  31        unsigned int reg_status;
  32        unsigned int pb_mask;
  33        const char *name;
  34};
  35
  36static const struct tps6521x_data tps65217_data = {
  37        .reg_status = TPS65217_REG_STATUS,
  38        .pb_mask = TPS65217_STATUS_PB,
  39        .name = "tps65217_pwrbutton",
  40};
  41
  42static 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
  48struct 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
  56static 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};
  61MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
  62
  63static 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
  85out:
  86        return IRQ_HANDLED;
  87}
  88
  89static 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, 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(dev->parent, NULL);
 122        pwr->dev = dev;
 123        pwr->idev = idev;
 124        device_init_wakeup(dev, true);
 125
 126        irq = platform_get_irq(pdev, 0);
 127        if (irq < 0)
 128                return -EINVAL;
 129
 130        error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
 131                                          IRQF_TRIGGER_RISING |
 132                                                IRQF_TRIGGER_FALLING |
 133                                                IRQF_ONESHOT,
 134                                          pwr->data->name, pwr);
 135        if (error) {
 136                dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error);
 137                return error;
 138        }
 139
 140        error= input_register_device(idev);
 141        if (error) {
 142                dev_err(dev, "Can't register power button: %d\n", error);
 143                return error;
 144        }
 145
 146        return 0;
 147}
 148
 149static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
 150        { "tps65218-pwrbutton", },
 151        { "tps65217-pwrbutton", },
 152        { /* sentinel */ }
 153};
 154MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
 155
 156static struct platform_driver tps6521x_pb_driver = {
 157        .probe  = tps6521x_pb_probe,
 158        .driver = {
 159                .name   = "tps6521x_pwrbutton",
 160                .of_match_table = of_tps6521x_pb_match,
 161        },
 162        .id_table = tps6521x_pwrbtn_id_table,
 163};
 164module_platform_driver(tps6521x_pb_driver);
 165
 166MODULE_DESCRIPTION("TPS6521X Power Button");
 167MODULE_LICENSE("GPL v2");
 168MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 169