drivers/platform/x86/intel_chtdc_ti_pwrbtn.c

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