LXR linux/drivers/platform/x86/intel_mrfld

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Power-button driver for Basin Cove PMIC
   4 *
   5 * Copyright (c) 2019, Intel Corporation.
   6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7 */
   8
   9#include <linux/input.h>
  10#include <linux/interrupt.h>
  11#include <linux/device.h>
  12#include <linux/mfd/intel_soc_pmic.h>
  13#include <linux/mfd/intel_soc_pmic_mrfld.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16#include <linux/pm_wakeirq.h>
  17#include <linux/slab.h>
  18
  19#define BCOVE_PBSTATUS          0x27
  20#define BCOVE_PBSTATUS_PBLVL    BIT(4)  /* 1 - release, 0 - press */
  21
  22static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
  23{
  24        struct input_dev *input = dev_id;
  25        struct device *dev = input->dev.parent;
  26        struct regmap *regmap = dev_get_drvdata(dev);
  27        unsigned int state;
  28        int ret;
  29
  30        ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
  31        if (ret)
  32                return IRQ_NONE;
  33
  34        dev_dbg(dev, "PBSTATUS=0x%x\n", state);
  35        input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
  36        input_sync(input);
  37
  38        regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
  39        return IRQ_HANDLED;
  40}
  41
  42static int mrfld_pwrbtn_probe(struct platform_device *pdev)
  43{
  44        struct device *dev = &pdev->dev;
  45        struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
  46        struct input_dev *input;
  47        int irq, ret;
  48
  49        irq = platform_get_irq(pdev, 0);
  50        if (irq < 0)
  51                return irq;
  52
  53        input = devm_input_allocate_device(dev);
  54        if (!input)
  55                return -ENOMEM;
  56        input->name = pdev->name;
  57        input->phys = "power-button/input0";
  58        input->id.bustype = BUS_HOST;
  59        input->dev.parent = dev;
  60        input_set_capability(input, EV_KEY, KEY_POWER);
  61        ret = input_register_device(input);
  62        if (ret)
  63                return ret;
  64
  65        dev_set_drvdata(dev, pmic->regmap);
  66
  67        ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
  68                                        IRQF_ONESHOT | IRQF_SHARED, pdev->name,
  69                                        input);
  70        if (ret)
  71                return ret;
  72
  73        regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
  74        regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
  75
  76        device_init_wakeup(dev, true);
  77        dev_pm_set_wake_irq(dev, irq);
  78        return 0;
  79}
  80
  81static int mrfld_pwrbtn_remove(struct platform_device *pdev)
  82{
  83        struct device *dev = &pdev->dev;
  84
  85        dev_pm_clear_wake_irq(dev);
  86        device_init_wakeup(dev, false);
  87        return 0;
  88}
  89
  90static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
  91        { .name = "mrfld_bcove_pwrbtn" },
  92        {}
  93};
  94MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
  95
  96static struct platform_driver mrfld_pwrbtn_driver = {
  97        .driver = {
  98                .name   = "mrfld_bcove_pwrbtn",
  99        },
 100        .probe          = mrfld_pwrbtn_probe,
 101        .remove         = mrfld_pwrbtn_remove,
 102        .id_table       = mrfld_pwrbtn_id_table,
 103};
 104module_platform_driver(mrfld_pwrbtn_driver);
 105
 106MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
 107MODULE_LICENSE("GPL v2");
 108