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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | static struct acpi_driver acpi_memory_device_driver = { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 62 | .name = ACPI_MEMORY_DEVICE_DRIVER_NAME, |
| 63 | .class = ACPI_MEMORY_DEVICE_CLASS, |
| 64 | .ids = ACPI_MEMORY_DEVICE_HID, |
| 65 | .ops = { |
| 66 | .add = acpi_memory_device_add, |
| 67 | .remove = acpi_memory_device_remove, |
| 68 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | }; |
| 70 | |
| 71 | struct acpi_memory_device { |
| 72 | acpi_handle handle; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 73 | unsigned int state; /* State of the memory device */ |
KAMEZAWA Hiroyuki | 3963f00 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 74 | unsigned short caching; /* memory cache attribute */ |
| 75 | unsigned short write_protect; /* memory read/write attribute */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 76 | u64 start_addr; /* Memory Range start physical addr */ |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 77 | u64 length; /* Memory Range length */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | }; |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | static int |
| 81 | acpi_memory_get_device_resources(struct acpi_memory_device *mem_device) |
| 82 | { |
| 83 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 84 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | struct acpi_resource *resource = NULL; |
| 86 | struct acpi_resource_address64 address64; |
| 87 | |
| 88 | ACPI_FUNCTION_TRACE("acpi_memory_get_device_resources"); |
| 89 | |
| 90 | /* Get the range from the _CRS */ |
| 91 | status = acpi_get_current_resources(mem_device->handle, &buffer); |
| 92 | if (ACPI_FAILURE(status)) |
| 93 | return_VALUE(-EINVAL); |
| 94 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 95 | resource = (struct acpi_resource *)buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | status = acpi_resource_to_address64(resource, &address64); |
| 97 | if (ACPI_SUCCESS(status)) { |
| 98 | if (address64.resource_type == ACPI_MEMORY_RANGE) { |
| 99 | /* Populate the structure */ |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 100 | mem_device->caching = address64.info.mem.caching; |
KAMEZAWA Hiroyuki | 3963f00 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 101 | mem_device->write_protect = |
| 102 | address64.info.mem.write_protect; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 103 | mem_device->start_addr = address64.minimum; |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 104 | mem_device->length = address64.address_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | } |
| 107 | |
| 108 | acpi_os_free(buffer.pointer); |
| 109 | return_VALUE(0); |
| 110 | } |
| 111 | |
| 112 | static int |
| 113 | acpi_memory_get_device(acpi_handle handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 114 | struct acpi_memory_device **mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
| 116 | acpi_status status; |
| 117 | acpi_handle phandle; |
| 118 | struct acpi_device *device = NULL; |
| 119 | struct acpi_device *pdevice = NULL; |
| 120 | |
| 121 | ACPI_FUNCTION_TRACE("acpi_memory_get_device"); |
| 122 | |
| 123 | if (!acpi_bus_get_device(handle, &device) && device) |
| 124 | goto end; |
| 125 | |
| 126 | status = acpi_get_parent(handle, &phandle); |
| 127 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 128 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | return_VALUE(-EINVAL); |
| 130 | } |
| 131 | |
| 132 | /* Get the parent device */ |
| 133 | status = acpi_bus_get_device(phandle, &pdevice); |
| 134 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 135 | ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | return_VALUE(-EINVAL); |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Now add the notified device. This creates the acpi_device |
| 141 | * and invokes .add function |
| 142 | */ |
| 143 | status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
| 144 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 145 | ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | return_VALUE(-EINVAL); |
| 147 | } |
| 148 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 149 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | *mem_device = acpi_driver_data(device); |
| 151 | if (!(*mem_device)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 152 | printk(KERN_ERR "\n driver data not found"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | return_VALUE(-ENODEV); |
| 154 | } |
| 155 | |
| 156 | return_VALUE(0); |
| 157 | } |
| 158 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 159 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
| 161 | unsigned long current_status; |
| 162 | |
| 163 | ACPI_FUNCTION_TRACE("acpi_memory_check_device"); |
| 164 | |
| 165 | /* Get device present/absent information from the _STA */ |
| 166 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 167 | NULL, ¤t_status))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return_VALUE(-ENODEV); |
| 169 | /* |
| 170 | * Check for device status. Device should be |
| 171 | * present/enabled/functioning. |
| 172 | */ |
| 173 | if (!((current_status & ACPI_MEMORY_STA_PRESENT) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 174 | && (current_status & ACPI_MEMORY_STA_ENABLED) |
| 175 | && (current_status & ACPI_MEMORY_STA_FUNCTIONAL))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | return_VALUE(-ENODEV); |
| 177 | |
| 178 | return_VALUE(0); |
| 179 | } |
| 180 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 181 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
| 183 | int result; |
| 184 | |
| 185 | ACPI_FUNCTION_TRACE("acpi_memory_enable_device"); |
| 186 | |
| 187 | /* Get the range from the _CRS */ |
| 188 | result = acpi_memory_get_device_resources(mem_device); |
| 189 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 190 | printk(KERN_ERR PREFIX "get_device_resources failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | mem_device->state = MEMORY_INVALID_STATE; |
| 192 | return result; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Tell the VM there is more memory here... |
| 197 | * Note: Assume that this function returns zero on success |
| 198 | */ |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 199 | result = add_memory(mem_device->start_addr, mem_device->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 201 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | mem_device->state = MEMORY_INVALID_STATE; |
| 203 | return result; |
| 204 | } |
| 205 | |
| 206 | return result; |
| 207 | } |
| 208 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 209 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | { |
| 211 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 212 | struct acpi_object_list arg_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | union acpi_object arg; |
| 214 | unsigned long current_status; |
| 215 | |
| 216 | ACPI_FUNCTION_TRACE("acpi_memory_powerdown_device"); |
| 217 | |
| 218 | /* Issue the _EJ0 command */ |
| 219 | arg_list.count = 1; |
| 220 | arg_list.pointer = &arg; |
| 221 | arg.type = ACPI_TYPE_INTEGER; |
| 222 | arg.integer.value = 1; |
| 223 | status = acpi_evaluate_object(mem_device->handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 224 | "_EJ0", &arg_list, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* Return on _EJ0 failure */ |
| 226 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 227 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return_VALUE(-ENODEV); |
| 229 | } |
| 230 | |
| 231 | /* Evalute _STA to check if the device is disabled */ |
| 232 | status = acpi_evaluate_integer(mem_device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 233 | NULL, ¤t_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | if (ACPI_FAILURE(status)) |
| 235 | return_VALUE(-ENODEV); |
| 236 | |
| 237 | /* Check for device status. Device should be disabled */ |
| 238 | if (current_status & ACPI_MEMORY_STA_ENABLED) |
| 239 | return_VALUE(-EINVAL); |
| 240 | |
| 241 | return_VALUE(0); |
| 242 | } |
| 243 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 244 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | { |
| 246 | int result; |
| 247 | u64 start = mem_device->start_addr; |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 248 | u64 len = mem_device->length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | ACPI_FUNCTION_TRACE("acpi_memory_disable_device"); |
| 251 | |
| 252 | /* |
| 253 | * Ask the VM to offline this memory range. |
| 254 | * Note: Assume that this function returns zero on success |
| 255 | */ |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 256 | result = remove_memory(start, len); |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 257 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | return_VALUE(result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | /* Power-off and eject the device */ |
| 261 | result = acpi_memory_powerdown_device(mem_device); |
| 262 | if (result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | /* Set the status of the device to invalid */ |
| 264 | mem_device->state = MEMORY_INVALID_STATE; |
| 265 | return result; |
| 266 | } |
| 267 | |
| 268 | mem_device->state = MEMORY_POWER_OFF_STATE; |
| 269 | return result; |
| 270 | } |
| 271 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 272 | 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] | 273 | { |
| 274 | struct acpi_memory_device *mem_device; |
| 275 | struct acpi_device *device; |
| 276 | |
| 277 | ACPI_FUNCTION_TRACE("acpi_memory_device_notify"); |
| 278 | |
| 279 | switch (event) { |
| 280 | case ACPI_NOTIFY_BUS_CHECK: |
| 281 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 282 | "\nReceived BUS CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | /* Fall Through */ |
| 284 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 285 | if (event == ACPI_NOTIFY_DEVICE_CHECK) |
| 286 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 287 | "\nReceived DEVICE CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (acpi_memory_get_device(handle, &mem_device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 289 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return_VOID; |
| 291 | } |
| 292 | |
| 293 | if (!acpi_memory_check_device(mem_device)) { |
| 294 | if (acpi_memory_enable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 295 | printk(KERN_ERR PREFIX |
| 296 | "Cannot enable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
| 298 | break; |
| 299 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 300 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 301 | "\nReceived EJECT REQUEST notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
| 303 | if (acpi_bus_get_device(handle, &device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 304 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | break; |
| 306 | } |
| 307 | mem_device = acpi_driver_data(device); |
| 308 | if (!mem_device) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 309 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | break; |
| 311 | } |
| 312 | |
| 313 | /* |
| 314 | * Currently disabling memory device from kernel mode |
| 315 | * TBD: Can also be disabled from user mode scripts |
| 316 | * TBD: Can also be disabled by Callback registration |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 317 | * with generic sysfs driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | */ |
| 319 | if (acpi_memory_disable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame^] | 320 | printk(KERN_ERR PREFIX |
| 321 | "Disable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* |
| 323 | * TBD: Invoke acpi_bus_remove to cleanup data structures |
| 324 | */ |
| 325 | break; |
| 326 | default: |
| 327 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 328 | "Unsupported event [0x%x]\n", event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | break; |
| 330 | } |
| 331 | |
| 332 | return_VOID; |
| 333 | } |
| 334 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 335 | static int acpi_memory_device_add(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
| 337 | int result; |
| 338 | struct acpi_memory_device *mem_device = NULL; |
| 339 | |
| 340 | ACPI_FUNCTION_TRACE("acpi_memory_device_add"); |
| 341 | |
| 342 | if (!device) |
| 343 | return_VALUE(-EINVAL); |
| 344 | |
| 345 | mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
| 346 | if (!mem_device) |
| 347 | return_VALUE(-ENOMEM); |
| 348 | memset(mem_device, 0, sizeof(struct acpi_memory_device)); |
| 349 | |
| 350 | mem_device->handle = device->handle; |
| 351 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
| 352 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); |
| 353 | acpi_driver_data(device) = mem_device; |
| 354 | |
| 355 | /* Get the range from the _CRS */ |
| 356 | result = acpi_memory_get_device_resources(mem_device); |
| 357 | if (result) { |
| 358 | kfree(mem_device); |
| 359 | return_VALUE(result); |
| 360 | } |
| 361 | |
| 362 | /* Set the device state */ |
| 363 | mem_device->state = MEMORY_POWER_ON_STATE; |
| 364 | |
| 365 | printk(KERN_INFO "%s \n", acpi_device_name(device)); |
| 366 | |
| 367 | return_VALUE(result); |
| 368 | } |
| 369 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 370 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | struct acpi_memory_device *mem_device = NULL; |
| 373 | |
| 374 | ACPI_FUNCTION_TRACE("acpi_memory_device_remove"); |
| 375 | |
| 376 | if (!device || !acpi_driver_data(device)) |
| 377 | return_VALUE(-EINVAL); |
| 378 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 379 | mem_device = (struct acpi_memory_device *)acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | kfree(mem_device); |
| 381 | |
| 382 | return_VALUE(0); |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * Helper function to check for memory device |
| 387 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 388 | static acpi_status is_memory_device(acpi_handle handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
| 390 | char *hardware_id; |
| 391 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 392 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | struct acpi_device_info *info; |
| 394 | |
| 395 | ACPI_FUNCTION_TRACE("is_memory_device"); |
| 396 | |
| 397 | status = acpi_get_object_info(handle, &buffer); |
| 398 | if (ACPI_FAILURE(status)) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 399 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | info = buffer.pointer; |
| 402 | if (!(info->valid & ACPI_VALID_HID)) { |
| 403 | acpi_os_free(buffer.pointer); |
| 404 | return_ACPI_STATUS(AE_ERROR); |
| 405 | } |
| 406 | |
| 407 | hardware_id = info->hardware_id.value; |
| 408 | if ((hardware_id == NULL) || |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 409 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | status = AE_ERROR; |
| 411 | |
| 412 | acpi_os_free(buffer.pointer); |
| 413 | return_ACPI_STATUS(status); |
| 414 | } |
| 415 | |
| 416 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 417 | acpi_memory_register_notify_handler(acpi_handle handle, |
| 418 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | { |
| 420 | acpi_status status; |
| 421 | |
| 422 | ACPI_FUNCTION_TRACE("acpi_memory_register_notify_handler"); |
| 423 | |
| 424 | status = is_memory_device(handle); |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 425 | if (ACPI_FAILURE(status)){ |
| 426 | ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | return_ACPI_STATUS(AE_OK); /* continue */ |
| 428 | } |
| 429 | |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 430 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| 431 | acpi_memory_device_notify, NULL); |
| 432 | /* continue */ |
| 433 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | } |
| 435 | |
| 436 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 437 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
| 438 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | { |
| 440 | acpi_status status; |
| 441 | |
| 442 | ACPI_FUNCTION_TRACE("acpi_memory_deregister_notify_handler"); |
| 443 | |
| 444 | status = is_memory_device(handle); |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 445 | if (ACPI_FAILURE(status)){ |
| 446 | ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | return_ACPI_STATUS(AE_OK); /* continue */ |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 448 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | status = acpi_remove_notify_handler(handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 451 | ACPI_SYSTEM_NOTIFY, |
| 452 | acpi_memory_device_notify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 454 | return_ACPI_STATUS(AE_OK); /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
| 456 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 457 | static int __init acpi_memory_device_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
| 459 | int result; |
| 460 | acpi_status status; |
| 461 | |
| 462 | ACPI_FUNCTION_TRACE("acpi_memory_device_init"); |
| 463 | |
| 464 | result = acpi_bus_register_driver(&acpi_memory_device_driver); |
| 465 | |
| 466 | if (result < 0) |
| 467 | return_VALUE(-ENODEV); |
| 468 | |
| 469 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 470 | ACPI_UINT32_MAX, |
| 471 | acpi_memory_register_notify_handler, |
| 472 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 474 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 475 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 477 | return_VALUE(-ENODEV); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | return_VALUE(0); |
| 481 | } |
| 482 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 483 | static void __exit acpi_memory_device_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | { |
| 485 | acpi_status status; |
| 486 | |
| 487 | ACPI_FUNCTION_TRACE("acpi_memory_device_exit"); |
| 488 | |
| 489 | /* |
| 490 | * Adding this to un-install notification handlers for all the device |
| 491 | * handles. |
| 492 | */ |
| 493 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 494 | ACPI_UINT32_MAX, |
| 495 | acpi_memory_deregister_notify_handler, |
| 496 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 498 | if (ACPI_FAILURE(status)) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 499 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 502 | |
| 503 | return_VOID; |
| 504 | } |
| 505 | |
| 506 | module_init(acpi_memory_device_init); |
| 507 | module_exit(acpi_memory_device_exit); |