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_runtime.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/property.h>
  21
  22 #include "intel-lpss.h"
  23
  24 static struct property_entry spt_i2c_properties[] = {
  25         PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 230),
  26         { },
  27 };
  28
  29 static const struct intel_lpss_platform_info spt_i2c_info = {
  30         .clk_rate = 120000000,
  31         .properties = spt_i2c_properties,
  32 };
  33
  34 static const struct intel_lpss_platform_info bxt_info = {
  35         .clk_rate = 100000000,
  36 };
  37
  38 static struct property_entry bxt_i2c_properties[] = {
  39         PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 42),
  40         PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
  41         PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
  42         { },
  43 };
  44
  45 static const struct intel_lpss_platform_info bxt_i2c_info = {
  46         .clk_rate = 133000000,
  47         .properties = bxt_i2c_properties,
  48 };
  49
  50 static struct property_entry apl_i2c_properties[] = {
  51         PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 207),
  52         PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
  53         PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
  54         { },
  55 };
  56
  57 static const struct intel_lpss_platform_info apl_i2c_info = {
  58         .clk_rate = 133000000,
  59         .properties = apl_i2c_properties,
  60 };
  61
  62 static const struct acpi_device_id intel_lpss_acpi_ids[] = {
  63         /* SPT */
  64         { "INT3446", (kernel_ulong_t)&spt_i2c_info },
  65         { "INT3447", (kernel_ulong_t)&spt_i2c_info },
  66         /* BXT */
  67         { "80860AAC", (kernel_ulong_t)&bxt_i2c_info },
  68         { "80860ABC", (kernel_ulong_t)&bxt_info },
  69         { "80860AC2", (kernel_ulong_t)&bxt_info },
  70         /* APL */
  71         { "80865AAC", (kernel_ulong_t)&apl_i2c_info },
  72         { "80865ABC", (kernel_ulong_t)&bxt_info },
  73         { "80865AC2", (kernel_ulong_t)&bxt_info },
  74         { }
  75 };
  76 MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids);
  77
  78 static int intel_lpss_acpi_probe(struct platform_device *pdev)
  79 {
  80         struct intel_lpss_platform_info *info;
  81         const struct acpi_device_id *id;
  82
  83         id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
  84         if (!id)
  85                 return -ENODEV;
  86
  87         info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
  88                             GFP_KERNEL);
  89         if (!info)
  90                 return -ENOMEM;
  91
  92         info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  93         info->irq = platform_get_irq(pdev, 0);
  94
  95         pm_runtime_set_active(&pdev->dev);
  96         pm_runtime_enable(&pdev->dev);
  97
  98         return intel_lpss_probe(&pdev->dev, info);
  99 }
 100
 101 static int intel_lpss_acpi_remove(struct platform_device *pdev)
 102 {
 103         intel_lpss_remove(&pdev->dev);
 104         pm_runtime_disable(&pdev->dev);
 105
 106         return 0;
 107 }
 108
 109 static INTEL_LPSS_PM_OPS(intel_lpss_acpi_pm_ops);
 110
 111 static struct platform_driver intel_lpss_acpi_driver = {
 112         .probe = intel_lpss_acpi_probe,
 113         .remove = intel_lpss_acpi_remove,
 114         .driver = {
 115                 .name = "intel-lpss",
 116                 .acpi_match_table = intel_lpss_acpi_ids,
 117                 .pm = &intel_lpss_acpi_pm_ops,
 118         },
 119 };
 120
 121 module_platform_driver(intel_lpss_acpi_driver);
 122
 123 MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
 124 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
 125 MODULE_DESCRIPTION("Intel LPSS ACPI driver");
 126 MODULE_LICENSE("GPL v2");