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29#include <linux/kernel.h>
30#include <linux/module.h>
31#include <linux/init.h>
32#include <linux/types.h>
33#include <linux/acpi.h>
34#include <acpi/acpi_bus.h>
35#include <acpi/acpi_drivers.h>
36#include <acpi/container.h>
37
38#define PREFIX "ACPI: "
39
40#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
41#define ACPI_CONTAINER_CLASS "container"
42
43#define INSTALL_NOTIFY_HANDLER 1
44#define UNINSTALL_NOTIFY_HANDLER 2
45
46#define _COMPONENT ACPI_CONTAINER_COMPONENT
47ACPI_MODULE_NAME("container");
48
49MODULE_AUTHOR("Anil S Keshavamurthy");
50MODULE_DESCRIPTION("ACPI container driver");
51MODULE_LICENSE("GPL");
52
53static int acpi_container_add(struct acpi_device *device);
54static int acpi_container_remove(struct acpi_device *device, int type);
55
56static const struct acpi_device_id container_device_ids[] = {
57 {"ACPI0004", 0},
58 {"PNP0A05", 0},
59 {"PNP0A06", 0},
60 {"", 0},
61};
62MODULE_DEVICE_TABLE(acpi, container_device_ids);
63
64static struct acpi_driver acpi_container_driver = {
65 .name = "container",
66 .class = ACPI_CONTAINER_CLASS,
67 .ids = container_device_ids,
68 .ops = {
69 .add = acpi_container_add,
70 .remove = acpi_container_remove,
71 },
72};
73
74
75
76static int is_device_present(acpi_handle handle)
77{
78 acpi_handle temp;
79 acpi_status status;
80 unsigned long long sta;
81
82
83 status = acpi_get_handle(handle, "_STA", &temp);
84 if (ACPI_FAILURE(status))
85 return 1;
86
87 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
88 if (ACPI_FAILURE(status))
89 return 0;
90
91 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
92}
93
94
95static int acpi_container_add(struct acpi_device *device)
96{
97 struct acpi_container *container;
98
99
100 if (!device) {
101 printk(KERN_ERR PREFIX "device is NULL\n");
102 return -EINVAL;
103 }
104
105 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
106 if (!container)
107 return -ENOMEM;
108
109 container->handle = device->handle;
110 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
111 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
112 device->driver_data = container;
113
114 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
115 acpi_device_name(device), acpi_device_bid(device)));
116
117 return 0;
118}
119
120static int acpi_container_remove(struct acpi_device *device, int type)
121{
122 acpi_status status = AE_OK;
123 struct acpi_container *pc = NULL;
124
125 pc = acpi_driver_data(device);
126 kfree(pc);
127 return status;
128}
129
130static int container_device_add(struct acpi_device **device, acpi_handle handle)
131{
132 acpi_handle phandle;
133 struct acpi_device *pdev;
134 int result;
135
136
137 if (acpi_get_parent(handle, &phandle)) {
138 return -ENODEV;
139 }
140
141 if (acpi_bus_get_device(phandle, &pdev)) {
142 return -ENODEV;
143 }
144
145 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
146 return -ENODEV;
147 }
148
149 result = acpi_bus_start(*device);
150
151 return result;
152}
153
154static void container_notify_cb(acpi_handle handle, u32 type, void *context)
155{
156 struct acpi_device *device = NULL;
157 int result;
158 int present;
159 acpi_status status;
160
161
162 present = is_device_present(handle);
163
164 switch (type) {
165 case ACPI_NOTIFY_BUS_CHECK:
166
167 case ACPI_NOTIFY_DEVICE_CHECK:
168 printk(KERN_WARNING "Container driver received %s event\n",
169 (type == ACPI_NOTIFY_BUS_CHECK) ?
170 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
171 status = acpi_bus_get_device(handle, &device);
172 if (present) {
173 if (ACPI_FAILURE(status) || !device) {
174 result = container_device_add(&device, handle);
175 if (!result)
176 kobject_uevent(&device->dev.kobj,
177 KOBJ_ONLINE);
178 else
179 printk(KERN_WARNING
180 "Failed to add container\n");
181 }
182 } else {
183 if (ACPI_SUCCESS(status)) {
184
185 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
186 }
187 }
188 break;
189 case ACPI_NOTIFY_EJECT_REQUEST:
190 if (!acpi_bus_get_device(handle, &device) && device) {
191 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
192 }
193 break;
194 default:
195 break;
196 }
197 return;
198}
199
200static acpi_status
201container_walk_namespace_cb(acpi_handle handle,
202 u32 lvl, void *context, void **rv)
203{
204 char *hid = NULL;
205 struct acpi_device_info *info;
206 acpi_status status;
207 int *action = context;
208
209 status = acpi_get_object_info(handle, &info);
210 if (ACPI_FAILURE(status)) {
211 return AE_OK;
212 }
213
214 if (info->valid & ACPI_VALID_HID)
215 hid = info->hardware_id.string;
216
217 if (hid == NULL) {
218 goto end;
219 }
220
221 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
222 strcmp(hid, "PNP0A06")) {
223 goto end;
224 }
225
226 switch (*action) {
227 case INSTALL_NOTIFY_HANDLER:
228 acpi_install_notify_handler(handle,
229 ACPI_SYSTEM_NOTIFY,
230 container_notify_cb, NULL);
231 break;
232 case UNINSTALL_NOTIFY_HANDLER:
233 acpi_remove_notify_handler(handle,
234 ACPI_SYSTEM_NOTIFY,
235 container_notify_cb);
236 break;
237 default:
238 break;
239 }
240
241 end:
242 kfree(info);
243
244 return AE_OK;
245}
246
247static int __init acpi_container_init(void)
248{
249 int result = 0;
250 int action = INSTALL_NOTIFY_HANDLER;
251
252 result = acpi_bus_register_driver(&acpi_container_driver);
253 if (result < 0) {
254 return (result);
255 }
256
257
258 acpi_walk_namespace(ACPI_TYPE_DEVICE,
259 ACPI_ROOT_OBJECT,
260 ACPI_UINT32_MAX,
261 container_walk_namespace_cb, &action, NULL);
262
263 return (0);
264}
265
266static void __exit acpi_container_exit(void)
267{
268 int action = UNINSTALL_NOTIFY_HANDLER;
269
270
271 acpi_walk_namespace(ACPI_TYPE_DEVICE,
272 ACPI_ROOT_OBJECT,
273 ACPI_UINT32_MAX,
274 container_walk_namespace_cb, &action, NULL);
275
276 acpi_bus_unregister_driver(&acpi_container_driver);
277
278 return;
279}
280
281module_init(acpi_container_init);
282module_exit(acpi_container_exit);
283
