Merge branch 'acpi-lpss' into acpi-cleanup
[linux-3.10.git] / drivers / acpi / acpi_platform.c
1 /*
2  * ACPI support for platform bus type.
3  *
4  * Copyright (C) 2012, Intel Corporation
5  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
6  *          Mathias Nyman <mathias.nyman@linux.intel.com>
7  *          Rafael J. Wysocki <rafael.j.wysocki@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/device.h>
16 #include <linux/err.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20
21 #include "internal.h"
22
23 ACPI_MODULE_NAME("platform");
24
25 static int acpi_create_platform_clks(struct acpi_device *adev)
26 {
27         static struct platform_device *pdev;
28
29         /* Create Lynxpoint LPSS clocks */
30         if (!pdev && !strncmp(acpi_device_hid(adev), "INT33C", 6)) {
31                 pdev = platform_device_register_simple("clk-lpt", -1, NULL, 0);
32                 if (IS_ERR(pdev))
33                         return PTR_ERR(pdev);
34         }
35
36         return 0;
37 }
38
39 /**
40  * acpi_create_platform_device - Create platform device for ACPI device node
41  * @adev: ACPI device node to create a platform device for.
42  * @flags: ACPI_PLATFORM_* flags that affect the creation of the platform
43  *         devices.
44  *
45  * Check if the given @adev can be represented as a platform device and, if
46  * that's the case, create and register a platform device, populate its common
47  * resources and returns a pointer to it.  Otherwise, return %NULL.
48  *
49  * Name of the platform device will be the same as @adev's.
50  */
51 struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
52                                                     unsigned long flags)
53 {
54         struct platform_device *pdev = NULL;
55         struct acpi_device *acpi_parent;
56         struct platform_device_info pdevinfo;
57         struct resource_list_entry *rentry;
58         struct list_head resource_list;
59         struct resource *resources;
60         int count;
61
62         if ((flags & ACPI_PLATFORM_CLK) && acpi_create_platform_clks(adev)) {
63                 dev_err(&adev->dev, "failed to create clocks\n");
64                 return NULL;
65         }
66
67         /* If the ACPI node already has a physical device attached, skip it. */
68         if (adev->physical_node_count)
69                 return NULL;
70
71         INIT_LIST_HEAD(&resource_list);
72         count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
73         if (count <= 0)
74                 return NULL;
75
76         resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
77         if (!resources) {
78                 dev_err(&adev->dev, "No memory for resources\n");
79                 acpi_dev_free_resource_list(&resource_list);
80                 return NULL;
81         }
82         count = 0;
83         list_for_each_entry(rentry, &resource_list, node)
84                 resources[count++] = rentry->res;
85
86         acpi_dev_free_resource_list(&resource_list);
87
88         memset(&pdevinfo, 0, sizeof(pdevinfo));
89         /*
90          * If the ACPI node has a parent and that parent has a physical device
91          * attached to it, that physical device should be the parent of the
92          * platform device we are about to create.
93          */
94         pdevinfo.parent = NULL;
95         acpi_parent = adev->parent;
96         if (acpi_parent) {
97                 struct acpi_device_physical_node *entry;
98                 struct list_head *list;
99
100                 mutex_lock(&acpi_parent->physical_node_lock);
101                 list = &acpi_parent->physical_node_list;
102                 if (!list_empty(list)) {
103                         entry = list_first_entry(list,
104                                         struct acpi_device_physical_node,
105                                         node);
106                         pdevinfo.parent = entry->dev;
107                 }
108                 mutex_unlock(&acpi_parent->physical_node_lock);
109         }
110         pdevinfo.name = dev_name(&adev->dev);
111         pdevinfo.id = -1;
112         pdevinfo.res = resources;
113         pdevinfo.num_res = count;
114         pdevinfo.acpi_node.handle = adev->handle;
115         pdev = platform_device_register_full(&pdevinfo);
116         if (IS_ERR(pdev)) {
117                 dev_err(&adev->dev, "platform device creation failed: %ld\n",
118                         PTR_ERR(pdev));
119                 pdev = NULL;
120         } else {
121                 dev_dbg(&adev->dev, "created platform device %s\n",
122                         dev_name(&pdev->dev));
123         }
124
125         kfree(resources);
126         return pdev;
127 }