drivers/mfd/intel-lpss-acpi.c

   1 /*
   2  * Intel LPSS ACPI support.
   3  *
   4  * Copyright (C) 2015, Intel Corporation
   5  *
   6  * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7  *          Mika Westerberg <mika.westerberg@linux.intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/acpi.h>
  15 #include <linux/ioport.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/pm.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/property.h>
  22
  23 #include "intel-lpss.h"
  24
  25 static const struct intel_lpss_platform_info spt_info = {
  26         .clk_rate = 120000000,
  27 };
  28
  29 static struct property_entry spt_i2c_properties[] = {
  30         PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 230),
  31         { },
  32 };
  33
  34 static const struct intel_lpss_platform_info spt_i2c_info = {
  35         .clk_rate = 120000000,
  36         .properties = spt_i2c_properties,
  37 };
  38
  39 static const struct intel_lpss_platform_info bxt_info = {
  40         .clk_rate = 100000000,
  41 };
  42
  43 static struct property_entry bxt_i2c_properties[] = {
  44         PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 42),
  45         PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
  46         PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
  47         { },
  48 };
  49
  50 static const struct intel_lpss_platform_info bxt_i2c_info = {
  51         .clk_rate = 133000000,
  52         .properties = bxt_i2c_properties,
  53 };
  54
  55 static const struct acpi_device_id intel_lpss_acpi_ids[] = {
  56         /* SPT */
  57         { "INT3446", (kernel_ulong_t)&spt_i2c_info },
  58         { "INT3447", (kernel_ulong_t)&spt_i2c_info },
  59         /* BXT */
  60         { "80860AAC", (kernel_ulong_t)&bxt_i2c_info },
  61         { "80860ABC", (kernel_ulong_t)&bxt_info },
  62         { "80860AC2", (kernel_ulong_t)&bxt_info },
  63         /* APL */
  64         { "80865AAC", (kernel_ulong_t)&bxt_i2c_info },
  65         { "80865ABC", (kernel_ulong_t)&bxt_info },
  66         { "80865AC2", (kernel_ulong_t)&bxt_info },
  67         { }
  68 };
  69 MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids);
  70
  71 static int intel_lpss_acpi_probe(struct platform_device *pdev)
  72 {
  73         struct intel_lpss_platform_info *info;
  74         const struct acpi_device_id *id;
  75
  76         id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
  77         if (!id)
  78                 return -ENODEV;
  79
  80         info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
  81                             GFP_KERNEL);
  82         if (!info)
  83                 return -ENOMEM;
  84
  85         info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  86         info->irq = platform_get_irq(pdev, 0);
  87
  88         pm_runtime_set_active(&pdev->dev);
  89         pm_runtime_enable(&pdev->dev);
  90
  91         return intel_lpss_probe(&pdev->dev, info);
  92 }
  93
  94 static int intel_lpss_acpi_remove(struct platform_device *pdev)
  95 {
  96         intel_lpss_remove(&pdev->dev);
  97         pm_runtime_disable(&pdev->dev);
  98
  99         return 0;
 100 }
 101
 102 static INTEL_LPSS_PM_OPS(intel_lpss_acpi_pm_ops);
 103
 104 static struct platform_driver intel_lpss_acpi_driver = {
 105         .probe = intel_lpss_acpi_probe,
 106         .remove = intel_lpss_acpi_remove,
 107         .driver = {
 108                 .name = "intel-lpss",
 109                 .acpi_match_table = intel_lpss_acpi_ids,
 110                 .pm = &intel_lpss_acpi_pm_ops,
 111         },
 112 };
 113
 114 module_platform_driver(intel_lpss_acpi_driver);
 115
 116 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 117 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
 118 MODULE_DESCRIPTION("Intel LPSS ACPI driver");
 119 MODULE_LICENSE("GPL v2");