drivers/platform/x86/intel/chtdc_ti_pwrbtn.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Power-button driver for Dollar Cove TI PMIC
   4  * Copyright (C) 2014 Intel Corp
   5  * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
   6  */
   7
   8 #include <linux/input.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/device.h>
  11 #include <linux/mfd/intel_soc_pmic.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/pm_wakeirq.h>
  15 #include <linux/slab.h>
  16
  17 #define CHTDC_TI_SIRQ_REG       0x3
  18 #define SIRQ_PWRBTN_REL         BIT(0)
  19
  20 static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
  21 {
  22         struct input_dev *input = dev_id;
  23         struct device *dev = input->dev.parent;
  24         struct regmap *regmap = dev_get_drvdata(dev);
  25         int state;
  26
  27         if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
  28                 dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
  29                 input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
  30                 input_sync(input);
  31         }
  32
  33         return IRQ_HANDLED;
  34 }
  35
  36 static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
  37 {
  38         struct device *dev = &pdev->dev;
  39         struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
  40         struct input_dev *input;
  41         int irq, err;
  42
  43         irq = platform_get_irq(pdev, 0);
  44         if (irq < 0)
  45                 return irq;
  46         input = devm_input_allocate_device(dev);
  47         if (!input)
  48                 return -ENOMEM;
  49         input->name = pdev->name;
  50         input->phys = "power-button/input0";
  51         input->id.bustype = BUS_HOST;
  52         input_set_capability(input, EV_KEY, KEY_POWER);
  53         err = input_register_device(input);
  54         if (err)
  55                 return err;
  56
  57         dev_set_drvdata(dev, pmic->regmap);
  58
  59         err = devm_request_threaded_irq(dev, irq, NULL,
  60                                         chtdc_ti_pwrbtn_interrupt,
  61                                         IRQF_ONESHOT, KBUILD_MODNAME, input);
  62         if (err)
  63                 return err;
  64
  65         device_init_wakeup(dev, true);
  66         dev_pm_set_wake_irq(dev, irq);
  67         return 0;
  68 }
  69
  70 static void chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
  71 {
  72         dev_pm_clear_wake_irq(&pdev->dev);
  73         device_init_wakeup(&pdev->dev, false);
  74 }
  75
  76 static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
  77         { .name = "chtdc_ti_pwrbtn" },
  78         {},
  79 };
  80 MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
  81
  82 static struct platform_driver chtdc_ti_pwrbtn_driver = {
  83         .driver = {
  84                 .name   = KBUILD_MODNAME,
  85         },
  86         .probe          = chtdc_ti_pwrbtn_probe,
  87         .remove         = chtdc_ti_pwrbtn_remove,
  88         .id_table       = chtdc_ti_pwrbtn_id_table,
  89 };
  90 module_platform_driver(chtdc_ti_pwrbtn_driver);
  91
  92 MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
  93 MODULE_LICENSE("GPL v2");