1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ACPI support for platform bus type.
4 *
5 * Copyright (C) 2012, Intel Corporation
6 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
7 * Mathias Nyman <mathias.nyman@linux.intel.com>
8 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9 */
10
11 #include <linux/acpi.h>
12 #include <linux/bits.h>
13 #include <linux/device.h>
14 #include <linux/err.h>
15 #include <linux/ioport.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/pci.h>
20 #include <linux/platform_device.h>
21
22 #include "internal.h"
23
24 /* Exclude devices that have no _CRS resources provided */
25 #define ACPI_ALLOW_WO_RESOURCES BIT(0)
26
27 static const struct acpi_device_id forbidden_id_list[] = {
28 {"ACPI0009", 0}, /* IOxAPIC */
29 {"ACPI000A", 0}, /* IOAPIC */
30 {"PNP0000", 0}, /* PIC */
31 {"PNP0100", 0}, /* Timer */
32 {"PNP0200", 0}, /* AT DMA Controller */
33 {ACPI_SMBUS_MS_HID, ACPI_ALLOW_WO_RESOURCES}, /* ACPI SMBUS virtual device */
34 { }
35 };
36
acpi_platform_device_find_by_companion(struct acpi_device * adev)37 static struct platform_device *acpi_platform_device_find_by_companion(struct acpi_device *adev)
38 {
39 struct device *dev;
40
41 dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev);
42 return dev ? to_platform_device(dev) : NULL;
43 }
44
acpi_platform_device_remove_notify(struct notifier_block * nb,unsigned long value,void * arg)45 static int acpi_platform_device_remove_notify(struct notifier_block *nb,
46 unsigned long value, void *arg)
47 {
48 struct acpi_device *adev = arg;
49 struct platform_device *pdev;
50
51 switch (value) {
52 case ACPI_RECONFIG_DEVICE_ADD:
53 /* Nothing to do here */
54 break;
55 case ACPI_RECONFIG_DEVICE_REMOVE:
56 if (!acpi_device_enumerated(adev))
57 break;
58
59 pdev = acpi_platform_device_find_by_companion(adev);
60 if (!pdev)
61 break;
62
63 platform_device_unregister(pdev);
64 put_device(&pdev->dev);
65 break;
66 }
67
68 return NOTIFY_OK;
69 }
70
71 static struct notifier_block acpi_platform_notifier = {
72 .notifier_call = acpi_platform_device_remove_notify,
73 };
74
acpi_platform_adjust_resources(struct acpi_device * adev,struct resource * new_res,struct resource * resources,unsigned int count)75 static unsigned int acpi_platform_adjust_resources(struct acpi_device *adev,
76 struct resource *new_res,
77 struct resource *resources,
78 unsigned int count)
79 {
80 unsigned int i;
81
82 if (!(new_res->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
83 return count;
84
85 for (i = 0; i < count; ) {
86 struct resource *res = &resources[i];
87
88 /*
89 * Look for overlaps of resources of the same type that would
90 * cause resource insertion to fail down the road.
91 */
92 if (__resource_contains_unbound(res, new_res) ||
93 __resource_contains_unbound(new_res, res) ||
94 resource_type(new_res) != resource_type(res) ||
95 !resource_union(new_res, res, new_res)) {
96 i++;
97 continue;
98 }
99
100 dev_info(&adev->dev, "%pR expanded due to overlap\n", new_res);
101 /*
102 * Eliminate the previously processed resource that overlapped
103 * with the new one because it is not necessary any more.
104 */
105 memmove(res, res + 1, (--count - i) * sizeof(*res));
106 }
107
108 return count;
109 }
110
acpi_platform_fill_resource(struct device * parent,const struct resource * src,struct resource * dest)111 static void acpi_platform_fill_resource(struct device *parent,
112 const struct resource *src,
113 struct resource *dest)
114 {
115 *dest = *src;
116 /*
117 * If the device has parent we need to take its resources into
118 * account as well because this device might consume part of those.
119 */
120 if (parent && dev_is_pci(parent))
121 dest->parent = pci_find_resource(to_pci_dev(parent), dest);
122 }
123
acpi_platform_resource_count(struct acpi_resource * ares,void * data)124 static unsigned int acpi_platform_resource_count(struct acpi_resource *ares, void *data)
125 {
126 bool *has_resources = data;
127
128 *has_resources = true;
129
130 return AE_CTRL_TERMINATE;
131 }
132
133 /**
134 * acpi_create_platform_device - Create platform device for ACPI device node
135 * @adev: ACPI device node to create a platform device for.
136 * @properties: Optional collection of build-in properties.
137 *
138 * Check if the given @adev can be represented as a platform device and, if
139 * that's the case, create and register a platform device, populate its common
140 * resources and returns a pointer to it. Otherwise, return %NULL.
141 *
142 * Name of the platform device will be the same as @adev's.
143 */
acpi_create_platform_device(struct acpi_device * adev,const struct property_entry * properties)144 struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
145 const struct property_entry *properties)
146 {
147 struct acpi_device *p = acpi_dev_parent(adev);
148 struct device *parent __free(put_device) = acpi_bus_get_primary_device(p);
149 struct platform_device *pdev = NULL;
150 struct platform_device_info pdevinfo;
151 const struct acpi_device_id *match;
152 struct resource *resources = NULL;
153 int count = 0;
154
155 /* If the ACPI node already has a physical device attached, skip it. */
156 if (adev->physical_node_count && !adev->pnp.type.backlight)
157 return NULL;
158
159 match = acpi_match_acpi_device(forbidden_id_list, adev);
160 if (match) {
161 if (match->driver_data & ACPI_ALLOW_WO_RESOURCES) {
162 bool has_resources = false;
163
164 acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
165 acpi_platform_resource_count, &has_resources);
166 if (has_resources)
167 return ERR_PTR(-EINVAL);
168 } else {
169 return ERR_PTR(-EINVAL);
170 }
171 }
172
173 if (adev->device_type == ACPI_BUS_TYPE_DEVICE) {
174 LIST_HEAD(resource_list);
175
176 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
177 if (count < 0)
178 return ERR_PTR(-ENODATA);
179
180 if (count > 0) {
181 struct resource_entry *rentry;
182
183 resources = kzalloc_objs(*resources, count);
184 if (!resources) {
185 acpi_dev_free_resource_list(&resource_list);
186 return ERR_PTR(-ENOMEM);
187 }
188 count = 0;
189 list_for_each_entry(rentry, &resource_list, node) {
190 count = acpi_platform_adjust_resources(adev,
191 rentry->res,
192 resources,
193 count);
194 acpi_platform_fill_resource(parent, rentry->res,
195 &resources[count++]);
196 }
197 acpi_dev_free_resource_list(&resource_list);
198 }
199 }
200
201 memset(&pdevinfo, 0, sizeof(pdevinfo));
202 /*
203 * If the ACPI node has a parent and that parent has a physical device
204 * attached to it, that physical device should be the parent of the
205 * platform device we are about to create.
206 */
207 pdevinfo.parent = parent;
208 pdevinfo.name = dev_name(&adev->dev);
209 pdevinfo.id = PLATFORM_DEVID_NONE;
210 pdevinfo.res = resources;
211 pdevinfo.num_res = count;
212 pdevinfo.fwnode = acpi_fwnode_handle(adev);
213 pdevinfo.properties = properties;
214
215 if (acpi_dma_supported(adev))
216 pdevinfo.dma_mask = DMA_BIT_MASK(32);
217 else
218 pdevinfo.dma_mask = 0;
219
220 pdev = platform_device_register_full(&pdevinfo);
221 if (IS_ERR(pdev))
222 dev_err(&adev->dev, "platform device creation failed: %ld\n",
223 PTR_ERR(pdev));
224 else {
225 set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
226 dev_dbg(&adev->dev, "created platform device %s\n",
227 dev_name(&pdev->dev));
228 }
229
230 kfree(resources);
231
232 return pdev;
233 }
234 EXPORT_SYMBOL_GPL(acpi_create_platform_device);
235
acpi_platform_init(void)236 void __init acpi_platform_init(void)
237 {
238 acpi_reconfig_notifier_register(&acpi_platform_notifier);
239 }
240