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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 ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
39#define ACPI_CONTAINER_CLASS "container"
40
41#define INSTALL_NOTIFY_HANDLER 1
42#define UNINSTALL_NOTIFY_HANDLER 2
43
44#define ACPI_CONTAINER_COMPONENT 0x01000000
45#define _COMPONENT ACPI_CONTAINER_COMPONENT
46ACPI_MODULE_NAME("container");
47
48MODULE_AUTHOR("Anil S Keshavamurthy");
49MODULE_DESCRIPTION("ACPI container driver");
50MODULE_LICENSE("GPL");
51
52static int acpi_container_add(struct acpi_device *device);
53static int acpi_container_remove(struct acpi_device *device, int type);
54
55static const struct acpi_device_id container_device_ids[] = {
56 {"ACPI0004", 0},
57 {"PNP0A05", 0},
58 {"PNP0A06", 0},
59 {"", 0},
60};
61MODULE_DEVICE_TABLE(acpi, container_device_ids);
62
63static struct acpi_driver acpi_container_driver = {
64 .name = "container",
65 .class = ACPI_CONTAINER_CLASS,
66 .ids = container_device_ids,
67 .ops = {
68 .add = acpi_container_add,
69 .remove = acpi_container_remove,
70 },
71};
72
73
74
75static int is_device_present(acpi_handle handle)
76{
77 acpi_handle temp;
78 acpi_status status;
79 unsigned long long sta;
80
81
82 status = acpi_get_handle(handle, "_STA", &temp);
83 if (ACPI_FAILURE(status))
84 return 1;
85
86 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
87 if (ACPI_FAILURE(status))
88 return 0;
89
90 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
91}
92
93
94static int acpi_container_add(struct acpi_device *device)
95{
96 struct acpi_container *container;
97
98
99 if (!device) {
100 printk(KERN_ERR PREFIX "device is NULL\n");
101 return -EINVAL;
102 }
103
104 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
105 if (!container)
106 return -ENOMEM;
107
108 container->handle = device->handle;
109 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
110 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
111 acpi_driver_data(device) = container;
112
113 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
114 acpi_device_name(device), acpi_device_bid(device)));
115
116 return 0;
117}
118
119static int acpi_container_remove(struct acpi_device *device, int type)
120{
121 acpi_status status = AE_OK;
122 struct acpi_container *pc = NULL;
123
124 pc = acpi_driver_data(device);
125 kfree(pc);
126 return status;
127}
128
129static int container_device_add(struct acpi_device **device, acpi_handle handle)
130{
131 acpi_handle phandle;
132 struct acpi_device *pdev;
133 int result;
134
135
136 if (acpi_get_parent(handle, &phandle)) {
137 return -ENODEV;
138 }
139
140 if (acpi_bus_get_device(phandle, &pdev)) {
141 return -ENODEV;
142 }
143
144 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
145 return -ENODEV;
146 }
147
148 result = acpi_bus_start(*device);
149
150 return result;
151}
152
153static void container_notify_cb(acpi_handle handle, u32 type, void *context)
154{
155 struct acpi_device *device = NULL;
156 int result;
157 int present;
158 acpi_status status;
159
160
161 present = is_device_present(handle);
162
163 switch (type) {
164 case ACPI_NOTIFY_BUS_CHECK:
165
166 case ACPI_NOTIFY_DEVICE_CHECK:
167 printk("Container driver received %s event\n",
168 (type == ACPI_NOTIFY_BUS_CHECK) ?
169 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
170 status = acpi_bus_get_device(handle, &device);
171 if (present) {
172 if (ACPI_FAILURE(status) || !device) {
173 result = container_device_add(&device, handle);
174 if (!result)
175 kobject_uevent(&device->dev.kobj,
176 KOBJ_ONLINE);
177 else
178 printk("Failed to add container\n");
179 }
180 } else {
181 if (ACPI_SUCCESS(status)) {
182
183 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
184 }
185 }
186 break;
187 case ACPI_NOTIFY_EJECT_REQUEST:
188 if (!acpi_bus_get_device(handle, &device) && device) {
189 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
190 }
191 break;
192 default:
193 break;
194 }
195 return;
196}
197
198static acpi_status
199container_walk_namespace_cb(acpi_handle handle,
200 u32 lvl, void *context, void **rv)
201{
202 char *hid = NULL;
203 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
204 struct acpi_device_info *info;
205 acpi_status status;
206 int *action = context;
207
208
209 status = acpi_get_object_info(handle, &buffer);
210 if (ACPI_FAILURE(status) || !buffer.pointer) {
211 return AE_OK;
212 }
213
214 info = buffer.pointer;
215 if (info->valid & ACPI_VALID_HID)
216 hid = info->hardware_id.value;
217
218 if (hid == NULL) {
219 goto end;
220 }
221
222 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
223 strcmp(hid, "PNP0A06")) {
224 goto end;
225 }
226
227 switch (*action) {
228 case INSTALL_NOTIFY_HANDLER:
229 acpi_install_notify_handler(handle,
230 ACPI_SYSTEM_NOTIFY,
231 container_notify_cb, NULL);
232 break;
233 case UNINSTALL_NOTIFY_HANDLER:
234 acpi_remove_notify_handler(handle,
235 ACPI_SYSTEM_NOTIFY,
236 container_notify_cb);
237 break;
238 default:
239 break;
240 }
241
242 end:
243 kfree(buffer.pointer);
244
245 return AE_OK;
246}
247
248static int __init acpi_container_init(void)
249{
250 int result = 0;
251 int action = INSTALL_NOTIFY_HANDLER;
252
253 result = acpi_bus_register_driver(&acpi_container_driver);
254 if (result < 0) {
255 return (result);
256 }
257
258
259 acpi_walk_namespace(ACPI_TYPE_DEVICE,
260 ACPI_ROOT_OBJECT,
261 ACPI_UINT32_MAX,
262 container_walk_namespace_cb, &action, NULL);
263
264 return (0);
265}
266
267static void __exit acpi_container_exit(void)
268{
269 int action = UNINSTALL_NOTIFY_HANDLER;
270
271
272 acpi_walk_namespace(ACPI_TYPE_DEVICE,
273 ACPI_ROOT_OBJECT,
274 ACPI_UINT32_MAX,
275 container_walk_namespace_cb, &action, NULL);
276
277 acpi_bus_unregister_driver(&acpi_container_driver);
278
279 return;
280}
281
282module_init(acpi_container_init);
283module_exit(acpi_container_exit);
284
