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