drivers/platform/x86/intel/mrfld_pwrbtn.c

   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
  22 static 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
  42 static 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
  81 static void 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 }
  88
  89 static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
  90         { .name = "mrfld_bcove_pwrbtn" },
  91         {}
  92 };
  93 MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
  94
  95 static struct platform_driver mrfld_pwrbtn_driver = {
  96         .driver = {
  97                 .name   = "mrfld_bcove_pwrbtn",
  98         },
  99         .probe          = mrfld_pwrbtn_probe,
 100         .remove         = mrfld_pwrbtn_remove,
 101         .id_table       = mrfld_pwrbtn_id_table,
 102 };
 103 module_platform_driver(mrfld_pwrbtn_driver);
 104
 105 MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
 106 MODULE_LICENSE("GPL v2");