Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 Intel Corporation <naveen.b.s@intel.com> |
| 3 | * |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or (at |
| 9 | * your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 14 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 15 | * details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | * |
| 21 | * |
| 22 | * ACPI based HotPlug driver that supports Memory Hotplug |
| 23 | * This driver fields notifications from firmare for memory add |
| 24 | * and remove operations and alerts the VM of the affected memory |
| 25 | * ranges. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/memory_hotplug.h> |
| 33 | #include <acpi/acpi_drivers.h> |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #define ACPI_MEMORY_DEVICE_COMPONENT 0x08000000UL |
| 36 | #define ACPI_MEMORY_DEVICE_CLASS "memory" |
| 37 | #define ACPI_MEMORY_DEVICE_HID "PNP0C80" |
| 38 | #define ACPI_MEMORY_DEVICE_DRIVER_NAME "Hotplug Mem Driver" |
| 39 | #define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device" |
| 40 | |
| 41 | #define _COMPONENT ACPI_MEMORY_DEVICE_COMPONENT |
| 42 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 43 | ACPI_MODULE_NAME("acpi_memory") |
| 44 | MODULE_AUTHOR("Naveen B S <naveen.b.s@intel.com>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | MODULE_DESCRIPTION(ACPI_MEMORY_DEVICE_DRIVER_NAME); |
| 46 | MODULE_LICENSE("GPL"); |
| 47 | |
| 48 | /* ACPI _STA method values */ |
| 49 | #define ACPI_MEMORY_STA_PRESENT (0x00000001UL) |
| 50 | #define ACPI_MEMORY_STA_ENABLED (0x00000002UL) |
| 51 | #define ACPI_MEMORY_STA_FUNCTIONAL (0x00000008UL) |
| 52 | |
| 53 | /* Memory Device States */ |
| 54 | #define MEMORY_INVALID_STATE 0 |
| 55 | #define MEMORY_POWER_ON_STATE 1 |
| 56 | #define MEMORY_POWER_OFF_STATE 2 |
| 57 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 58 | static int acpi_memory_device_add(struct acpi_device *device); |
| 59 | static int acpi_memory_device_remove(struct acpi_device *device, int type); |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame^] | 60 | static int acpi_memory_device_start(struct acpi_device *device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | static struct acpi_driver acpi_memory_device_driver = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 63 | .name = ACPI_MEMORY_DEVICE_DRIVER_NAME, |
| 64 | .class = ACPI_MEMORY_DEVICE_CLASS, |
| 65 | .ids = ACPI_MEMORY_DEVICE_HID, |
| 66 | .ops = { |
| 67 | .add = acpi_memory_device_add, |
| 68 | .remove = acpi_memory_device_remove, |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame^] | 69 | .start = acpi_memory_device_start, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 70 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | }; |
| 72 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 73 | struct acpi_memory_info { |
| 74 | struct list_head list; |
| 75 | u64 start_addr; /* Memory Range start physical addr */ |
| 76 | u64 length; /* Memory Range length */ |
| 77 | unsigned short caching; /* memory cache attribute */ |
| 78 | unsigned short write_protect; /* memory read/write attribute */ |
| 79 | unsigned int enabled:1; |
| 80 | }; |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | struct acpi_memory_device { |
| 83 | acpi_handle handle; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 84 | unsigned int state; /* State of the memory device */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 85 | struct list_head res_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | }; |
| 87 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 88 | static acpi_status |
| 89 | acpi_memory_get_resource(struct acpi_resource *resource, void *context) |
| 90 | { |
| 91 | struct acpi_memory_device *mem_device = context; |
| 92 | struct acpi_resource_address64 address64; |
| 93 | struct acpi_memory_info *info, *new; |
| 94 | acpi_status status; |
| 95 | |
| 96 | status = acpi_resource_to_address64(resource, &address64); |
| 97 | if (ACPI_FAILURE(status) || |
| 98 | (address64.resource_type != ACPI_MEMORY_RANGE)) |
| 99 | return AE_OK; |
| 100 | |
| 101 | list_for_each_entry(info, &mem_device->res_list, list) { |
| 102 | /* Can we combine the resource range information? */ |
| 103 | if ((info->caching == address64.info.mem.caching) && |
| 104 | (info->write_protect == address64.info.mem.write_protect) && |
| 105 | (info->start_addr + info->length == address64.minimum)) { |
| 106 | info->length += address64.address_length; |
| 107 | return AE_OK; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL); |
| 112 | if (!new) |
| 113 | return AE_ERROR; |
| 114 | |
| 115 | INIT_LIST_HEAD(&new->list); |
| 116 | new->caching = address64.info.mem.caching; |
| 117 | new->write_protect = address64.info.mem.write_protect; |
| 118 | new->start_addr = address64.minimum; |
| 119 | new->length = address64.address_length; |
| 120 | list_add_tail(&new->list, &mem_device->res_list); |
| 121 | |
| 122 | return AE_OK; |
| 123 | } |
| 124 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | static int |
| 126 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) |
| 127 | { |
| 128 | acpi_status status; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 129 | struct acpi_memory_info *info, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | ACPI_FUNCTION_TRACE("acpi_memory_get_device_resources"); |
| 132 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 133 | status = acpi_walk_resources(mem_device->handle, METHOD_NAME__CRS, |
| 134 | acpi_memory_get_resource, mem_device); |
| 135 | if (ACPI_FAILURE(status)) { |
| 136 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) |
| 137 | kfree(info); |
| 138 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 141 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | static int |
| 145 | acpi_memory_get_device(acpi_handle handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 146 | struct acpi_memory_device **mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
| 148 | acpi_status status; |
| 149 | acpi_handle phandle; |
| 150 | struct acpi_device *device = NULL; |
| 151 | struct acpi_device *pdevice = NULL; |
| 152 | |
| 153 | ACPI_FUNCTION_TRACE("acpi_memory_get_device"); |
| 154 | |
| 155 | if (!acpi_bus_get_device(handle, &device) && device) |
| 156 | goto end; |
| 157 | |
| 158 | status = acpi_get_parent(handle, &phandle); |
| 159 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 160 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error in acpi_get_parent\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | return_VALUE(-EINVAL); |
| 162 | } |
| 163 | |
| 164 | /* Get the parent device */ |
| 165 | status = acpi_bus_get_device(phandle, &pdevice); |
| 166 | if (ACPI_FAILURE(status)) { |
| 167 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 168 | "Error in acpi_bus_get_device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return_VALUE(-EINVAL); |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Now add the notified device. This creates the acpi_device |
| 174 | * and invokes .add function |
| 175 | */ |
| 176 | status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
| 177 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error in acpi_bus_add\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return_VALUE(-EINVAL); |
| 180 | } |
| 181 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 182 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | *mem_device = acpi_driver_data(device); |
| 184 | if (!(*mem_device)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 185 | printk(KERN_ERR "\n driver data not found"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return_VALUE(-ENODEV); |
| 187 | } |
| 188 | |
| 189 | return_VALUE(0); |
| 190 | } |
| 191 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 192 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
| 194 | unsigned long current_status; |
| 195 | |
| 196 | ACPI_FUNCTION_TRACE("acpi_memory_check_device"); |
| 197 | |
| 198 | /* Get device present/absent information from the _STA */ |
| 199 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 200 | NULL, ¤t_status))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | return_VALUE(-ENODEV); |
| 202 | /* |
| 203 | * Check for device status. Device should be |
| 204 | * present/enabled/functioning. |
| 205 | */ |
| 206 | if (!((current_status & ACPI_MEMORY_STA_PRESENT) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 207 | && (current_status & ACPI_MEMORY_STA_ENABLED) |
| 208 | && (current_status & ACPI_MEMORY_STA_FUNCTIONAL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | return_VALUE(-ENODEV); |
| 210 | |
| 211 | return_VALUE(0); |
| 212 | } |
| 213 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 214 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 216 | int result, num_enabled = 0; |
| 217 | struct acpi_memory_info *info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
| 219 | ACPI_FUNCTION_TRACE("acpi_memory_enable_device"); |
| 220 | |
| 221 | /* Get the range from the _CRS */ |
| 222 | result = acpi_memory_get_device_resources(mem_device); |
| 223 | if (result) { |
| 224 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 225 | "\nget_device_resources failed\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | mem_device->state = MEMORY_INVALID_STATE; |
| 227 | return result; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Tell the VM there is more memory here... |
| 232 | * Note: Assume that this function returns zero on success |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 233 | * We don't have memory-hot-add rollback function,now. |
| 234 | * (i.e. memory-hot-remove function) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 236 | list_for_each_entry(info, &mem_device->res_list, list) { |
| 237 | result = add_memory(info->start_addr, info->length); |
| 238 | if (result) |
| 239 | continue; |
| 240 | info->enabled = 1; |
| 241 | num_enabled++; |
| 242 | } |
| 243 | if (!num_enabled) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 244 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "\nadd_memory failed\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | mem_device->state = MEMORY_INVALID_STATE; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 246 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | return result; |
| 250 | } |
| 251 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 252 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
| 254 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 255 | struct acpi_object_list arg_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | union acpi_object arg; |
| 257 | unsigned long current_status; |
| 258 | |
| 259 | ACPI_FUNCTION_TRACE("acpi_memory_powerdown_device"); |
| 260 | |
| 261 | /* Issue the _EJ0 command */ |
| 262 | arg_list.count = 1; |
| 263 | arg_list.pointer = &arg; |
| 264 | arg.type = ACPI_TYPE_INTEGER; |
| 265 | arg.integer.value = 1; |
| 266 | status = acpi_evaluate_object(mem_device->handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 267 | "_EJ0", &arg_list, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | /* Return on _EJ0 failure */ |
| 269 | if (ACPI_FAILURE(status)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 270 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_EJ0 failed.\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return_VALUE(-ENODEV); |
| 272 | } |
| 273 | |
| 274 | /* Evalute _STA to check if the device is disabled */ |
| 275 | status = acpi_evaluate_integer(mem_device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 276 | NULL, ¤t_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (ACPI_FAILURE(status)) |
| 278 | return_VALUE(-ENODEV); |
| 279 | |
| 280 | /* Check for device status. Device should be disabled */ |
| 281 | if (current_status & ACPI_MEMORY_STA_ENABLED) |
| 282 | return_VALUE(-EINVAL); |
| 283 | |
| 284 | return_VALUE(0); |
| 285 | } |
| 286 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 287 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
| 289 | int result; |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 290 | struct acpi_memory_info *info, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | ACPI_FUNCTION_TRACE("acpi_memory_disable_device"); |
| 293 | |
| 294 | /* |
| 295 | * Ask the VM to offline this memory range. |
| 296 | * Note: Assume that this function returns zero on success |
| 297 | */ |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 298 | list_for_each_entry_safe(info, n, &mem_device->res_list, list) { |
| 299 | if (info->enabled) { |
| 300 | result = remove_memory(info->start_addr, info->length); |
| 301 | if (result) |
| 302 | return result; |
| 303 | } |
| 304 | kfree(info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | /* Power-off and eject the device */ |
| 308 | result = acpi_memory_powerdown_device(mem_device); |
| 309 | if (result) { |
| 310 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 311 | "Device Power Down failed.\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* Set the status of the device to invalid */ |
| 313 | mem_device->state = MEMORY_INVALID_STATE; |
| 314 | return result; |
| 315 | } |
| 316 | |
| 317 | mem_device->state = MEMORY_POWER_OFF_STATE; |
| 318 | return result; |
| 319 | } |
| 320 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 321 | static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
| 323 | struct acpi_memory_device *mem_device; |
| 324 | struct acpi_device *device; |
| 325 | |
| 326 | ACPI_FUNCTION_TRACE("acpi_memory_device_notify"); |
| 327 | |
| 328 | switch (event) { |
| 329 | case ACPI_NOTIFY_BUS_CHECK: |
| 330 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 331 | "\nReceived BUS CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | /* Fall Through */ |
| 333 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 334 | if (event == ACPI_NOTIFY_DEVICE_CHECK) |
| 335 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 336 | "\nReceived DEVICE CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | if (acpi_memory_get_device(handle, &mem_device)) { |
| 338 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 339 | "Error in finding driver data\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | return_VOID; |
| 341 | } |
| 342 | |
| 343 | if (!acpi_memory_check_device(mem_device)) { |
| 344 | if (acpi_memory_enable_device(mem_device)) |
| 345 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 346 | "Error in acpi_memory_enable_device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | break; |
| 349 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 350 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 351 | "\nReceived EJECT REQUEST notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
| 353 | if (acpi_bus_get_device(handle, &device)) { |
| 354 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 355 | "Device doesn't exist\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | break; |
| 357 | } |
| 358 | mem_device = acpi_driver_data(device); |
| 359 | if (!mem_device) { |
| 360 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 361 | "Driver Data is NULL\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | break; |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Currently disabling memory device from kernel mode |
| 367 | * TBD: Can also be disabled from user mode scripts |
| 368 | * TBD: Can also be disabled by Callback registration |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 369 | * with generic sysfs driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | */ |
| 371 | if (acpi_memory_disable_device(mem_device)) |
| 372 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 373 | "Error in acpi_memory_disable_device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | /* |
| 375 | * TBD: Invoke acpi_bus_remove to cleanup data structures |
| 376 | */ |
| 377 | break; |
| 378 | default: |
| 379 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 380 | "Unsupported event [0x%x]\n", event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | break; |
| 382 | } |
| 383 | |
| 384 | return_VOID; |
| 385 | } |
| 386 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 387 | static int acpi_memory_device_add(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | { |
| 389 | int result; |
| 390 | struct acpi_memory_device *mem_device = NULL; |
| 391 | |
| 392 | ACPI_FUNCTION_TRACE("acpi_memory_device_add"); |
| 393 | |
| 394 | if (!device) |
| 395 | return_VALUE(-EINVAL); |
| 396 | |
| 397 | mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
| 398 | if (!mem_device) |
| 399 | return_VALUE(-ENOMEM); |
| 400 | memset(mem_device, 0, sizeof(struct acpi_memory_device)); |
| 401 | |
KAMEZAWA Hiroyuki | 9ac0239 | 2006-06-27 02:53:27 -0700 | [diff] [blame] | 402 | INIT_LIST_HEAD(&mem_device->res_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | mem_device->handle = device->handle; |
| 404 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
| 405 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); |
| 406 | acpi_driver_data(device) = mem_device; |
| 407 | |
| 408 | /* Get the range from the _CRS */ |
| 409 | result = acpi_memory_get_device_resources(mem_device); |
| 410 | if (result) { |
| 411 | kfree(mem_device); |
| 412 | return_VALUE(result); |
| 413 | } |
| 414 | |
| 415 | /* Set the device state */ |
| 416 | mem_device->state = MEMORY_POWER_ON_STATE; |
| 417 | |
| 418 | printk(KERN_INFO "%s \n", acpi_device_name(device)); |
| 419 | |
| 420 | return_VALUE(result); |
| 421 | } |
| 422 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 423 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
| 425 | struct acpi_memory_device *mem_device = NULL; |
| 426 | |
| 427 | ACPI_FUNCTION_TRACE("acpi_memory_device_remove"); |
| 428 | |
| 429 | if (!device || !acpi_driver_data(device)) |
| 430 | return_VALUE(-EINVAL); |
| 431 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 432 | mem_device = (struct acpi_memory_device *)acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | kfree(mem_device); |
| 434 | |
| 435 | return_VALUE(0); |
| 436 | } |
| 437 | |
Yasunori Goto | 1f42599 | 2006-06-27 02:53:28 -0700 | [diff] [blame^] | 438 | static int acpi_memory_device_start (struct acpi_device *device) |
| 439 | { |
| 440 | struct acpi_memory_device *mem_device; |
| 441 | int result = 0; |
| 442 | |
| 443 | ACPI_FUNCTION_TRACE("acpi_memory_device_start"); |
| 444 | |
| 445 | mem_device = acpi_driver_data(device); |
| 446 | |
| 447 | if (!acpi_memory_check_device(mem_device)) { |
| 448 | /* call add_memory func */ |
| 449 | result = acpi_memory_enable_device(mem_device); |
| 450 | if (result) |
| 451 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
| 452 | "Error in acpi_memory_enable_device\n")); |
| 453 | } |
| 454 | return_VALUE(result); |
| 455 | } |
| 456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | /* |
| 458 | * Helper function to check for memory device |
| 459 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 460 | static acpi_status is_memory_device(acpi_handle handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
| 462 | char *hardware_id; |
| 463 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 464 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | struct acpi_device_info *info; |
| 466 | |
| 467 | ACPI_FUNCTION_TRACE("is_memory_device"); |
| 468 | |
| 469 | status = acpi_get_object_info(handle, &buffer); |
| 470 | if (ACPI_FAILURE(status)) |
| 471 | return_ACPI_STATUS(AE_ERROR); |
| 472 | |
| 473 | info = buffer.pointer; |
| 474 | if (!(info->valid & ACPI_VALID_HID)) { |
| 475 | acpi_os_free(buffer.pointer); |
| 476 | return_ACPI_STATUS(AE_ERROR); |
| 477 | } |
| 478 | |
| 479 | hardware_id = info->hardware_id.value; |
| 480 | if ((hardware_id == NULL) || |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 481 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | status = AE_ERROR; |
| 483 | |
| 484 | acpi_os_free(buffer.pointer); |
| 485 | return_ACPI_STATUS(status); |
| 486 | } |
| 487 | |
| 488 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 489 | acpi_memory_register_notify_handler(acpi_handle handle, |
| 490 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
| 492 | acpi_status status; |
| 493 | |
| 494 | ACPI_FUNCTION_TRACE("acpi_memory_register_notify_handler"); |
| 495 | |
| 496 | status = is_memory_device(handle); |
| 497 | if (ACPI_FAILURE(status)) |
| 498 | return_ACPI_STATUS(AE_OK); /* continue */ |
| 499 | |
| 500 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 501 | acpi_memory_device_notify, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | if (ACPI_FAILURE(status)) { |
| 503 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 504 | "Error installing notify handler\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | return_ACPI_STATUS(AE_OK); /* continue */ |
| 506 | } |
| 507 | |
| 508 | return_ACPI_STATUS(status); |
| 509 | } |
| 510 | |
| 511 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 512 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
| 513 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
| 515 | acpi_status status; |
| 516 | |
| 517 | ACPI_FUNCTION_TRACE("acpi_memory_deregister_notify_handler"); |
| 518 | |
| 519 | status = is_memory_device(handle); |
| 520 | if (ACPI_FAILURE(status)) |
| 521 | return_ACPI_STATUS(AE_OK); /* continue */ |
| 522 | |
| 523 | status = acpi_remove_notify_handler(handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 524 | ACPI_SYSTEM_NOTIFY, |
| 525 | acpi_memory_device_notify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | if (ACPI_FAILURE(status)) { |
| 527 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 528 | "Error removing notify handler\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | return_ACPI_STATUS(AE_OK); /* continue */ |
| 530 | } |
| 531 | |
| 532 | return_ACPI_STATUS(status); |
| 533 | } |
| 534 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 535 | static int __init acpi_memory_device_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | { |
| 537 | int result; |
| 538 | acpi_status status; |
| 539 | |
| 540 | ACPI_FUNCTION_TRACE("acpi_memory_device_init"); |
| 541 | |
| 542 | result = acpi_bus_register_driver(&acpi_memory_device_driver); |
| 543 | |
| 544 | if (result < 0) |
| 545 | return_VALUE(-ENODEV); |
| 546 | |
| 547 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 548 | ACPI_UINT32_MAX, |
| 549 | acpi_memory_register_notify_handler, |
| 550 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 552 | if (ACPI_FAILURE(status)) { |
| 553 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 555 | return_VALUE(-ENODEV); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 556 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | return_VALUE(0); |
| 559 | } |
| 560 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 561 | static void __exit acpi_memory_device_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | { |
| 563 | acpi_status status; |
| 564 | |
| 565 | ACPI_FUNCTION_TRACE("acpi_memory_device_exit"); |
| 566 | |
| 567 | /* |
| 568 | * Adding this to un-install notification handlers for all the device |
| 569 | * handles. |
| 570 | */ |
| 571 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 572 | ACPI_UINT32_MAX, |
| 573 | acpi_memory_deregister_notify_handler, |
| 574 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 576 | if (ACPI_FAILURE(status)) |
| 577 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "walk_namespace failed\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
| 579 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 580 | |
| 581 | return_VOID; |
| 582 | } |
| 583 | |
| 584 | module_init(acpi_memory_device_init); |
| 585 | module_exit(acpi_memory_device_exit); |