tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
25static const struct intel_lpss_platform_info spt_info = {
26 .clk_rate = 120000000,
27};
28
29static struct property_entry spt_i2c_properties[] = {
30 PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 230),
31 { },
32};
33
34static const struct intel_lpss_platform_info spt_i2c_info = {
35 .clk_rate = 120000000,
36 .properties = spt_i2c_properties,
37};
38
39static const struct intel_lpss_platform_info bxt_info = {
40 .clk_rate = 100000000,
41};
42
43static 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
50static const struct intel_lpss_platform_info bxt_i2c_info = {
51 .clk_rate = 133000000,
52 .properties = bxt_i2c_properties,
53};
54
55static struct property_entry apl_i2c_properties[] = {
56 PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 207),
57 PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
58 PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
59 { },
60};
61
62static const struct intel_lpss_platform_info apl_i2c_info = {
63 .clk_rate = 133000000,
64 .properties = apl_i2c_properties,
65};
66
67static const struct acpi_device_id intel_lpss_acpi_ids[] = {
68 /* SPT */
69 { "INT3446", (kernel_ulong_t)&spt_i2c_info },
70 { "INT3447", (kernel_ulong_t)&spt_i2c_info },
71 /* BXT */
72 { "80860AAC", (kernel_ulong_t)&bxt_i2c_info },
73 { "80860ABC", (kernel_ulong_t)&bxt_info },
74 { "80860AC2", (kernel_ulong_t)&bxt_info },
75 /* APL */
76 { "80865AAC", (kernel_ulong_t)&apl_i2c_info },
77 { "80865ABC", (kernel_ulong_t)&bxt_info },
78 { "80865AC2", (kernel_ulong_t)&bxt_info },
79 { }
80};
81MODULE_DEVICE_TABLE(acpi, intel_lpss_acpi_ids);
82
83static int intel_lpss_acpi_probe(struct platform_device *pdev)
84{
85 struct intel_lpss_platform_info *info;
86 const struct acpi_device_id *id;
87
88 id = acpi_match_device(intel_lpss_acpi_ids, &pdev->dev);
89 if (!id)
90 return -ENODEV;
91
92 info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
93 GFP_KERNEL);
94 if (!info)
95 return -ENOMEM;
96
97 info->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
98 info->irq = platform_get_irq(pdev, 0);
99
100 pm_runtime_set_active(&pdev->dev);
101 pm_runtime_enable(&pdev->dev);
102
103 return intel_lpss_probe(&pdev->dev, info);
104}
105
106static int intel_lpss_acpi_remove(struct platform_device *pdev)
107{
108 intel_lpss_remove(&pdev->dev);
109 pm_runtime_disable(&pdev->dev);
110
111 return 0;
112}
113
114static INTEL_LPSS_PM_OPS(intel_lpss_acpi_pm_ops);
115
116static struct platform_driver intel_lpss_acpi_driver = {
117 .probe = intel_lpss_acpi_probe,
118 .remove = intel_lpss_acpi_remove,
119 .driver = {
120 .name = "intel-lpss",
121 .acpi_match_table = intel_lpss_acpi_ids,
122 .pm = &intel_lpss_acpi_pm_ops,
123 },
124};
125
126module_platform_driver(intel_lpss_acpi_driver);
127
128MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");
129MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
130MODULE_DESCRIPTION("Intel LPSS ACPI driver");
131MODULE_LICENSE("GPL v2");