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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | /* Get the range from the _CRS */ |
| 90 | status = acpi_get_current_resources(mem_device->handle, &buffer); |
| 91 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 92 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 94 | resource = (struct acpi_resource *)buffer.pointer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | status = acpi_resource_to_address64(resource, &address64); |
| 96 | if (ACPI_SUCCESS(status)) { |
| 97 | if (address64.resource_type == ACPI_MEMORY_RANGE) { |
| 98 | /* Populate the structure */ |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 99 | mem_device->caching = address64.info.mem.caching; |
KAMEZAWA Hiroyuki | 3963f00 | 2006-01-06 01:31:00 -0500 | [diff] [blame] | 100 | mem_device->write_protect = |
| 101 | address64.info.mem.write_protect; |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 102 | mem_device->start_addr = address64.minimum; |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 103 | mem_device->length = address64.address_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | } |
| 105 | } |
| 106 | |
| 107 | acpi_os_free(buffer.pointer); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 108 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | static int |
| 112 | acpi_memory_get_device(acpi_handle handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 113 | struct acpi_memory_device **mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
| 115 | acpi_status status; |
| 116 | acpi_handle phandle; |
| 117 | struct acpi_device *device = NULL; |
| 118 | struct acpi_device *pdevice = NULL; |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | if (!acpi_bus_get_device(handle, &device) && device) |
| 122 | goto end; |
| 123 | |
| 124 | status = acpi_get_parent(handle, &phandle); |
| 125 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 126 | ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 127 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | /* Get the parent device */ |
| 131 | status = acpi_bus_get_device(phandle, &pdevice); |
| 132 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 133 | ACPI_EXCEPTION((AE_INFO, status, "Cannot get acpi bus device")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 134 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Now add the notified device. This creates the acpi_device |
| 139 | * and invokes .add function |
| 140 | */ |
| 141 | status = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE); |
| 142 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 143 | ACPI_EXCEPTION((AE_INFO, status, "Cannot add acpi bus")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 144 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 147 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | *mem_device = acpi_driver_data(device); |
| 149 | if (!(*mem_device)) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 150 | printk(KERN_ERR "\n driver data not found"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 151 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 154 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 157 | static int acpi_memory_check_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | { |
| 159 | unsigned long current_status; |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | /* Get device present/absent information from the _STA */ |
| 163 | if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 164 | NULL, ¤t_status))) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 165 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* |
| 167 | * Check for device status. Device should be |
| 168 | * present/enabled/functioning. |
| 169 | */ |
| 170 | if (!((current_status & ACPI_MEMORY_STA_PRESENT) |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 171 | && (current_status & ACPI_MEMORY_STA_ENABLED) |
| 172 | && (current_status & ACPI_MEMORY_STA_FUNCTIONAL))) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 173 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 175 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 178 | static int acpi_memory_enable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
| 180 | int result; |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | /* Get the range from the _CRS */ |
| 184 | result = acpi_memory_get_device_resources(mem_device); |
| 185 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 186 | printk(KERN_ERR PREFIX "get_device_resources failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | mem_device->state = MEMORY_INVALID_STATE; |
| 188 | return result; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Tell the VM there is more memory here... |
| 193 | * Note: Assume that this function returns zero on success |
| 194 | */ |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 195 | result = add_memory(mem_device->start_addr, mem_device->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | if (result) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 197 | printk(KERN_ERR PREFIX "add_memory failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | mem_device->state = MEMORY_INVALID_STATE; |
| 199 | return result; |
| 200 | } |
| 201 | |
| 202 | return result; |
| 203 | } |
| 204 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 205 | static int acpi_memory_powerdown_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
| 207 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 208 | struct acpi_object_list arg_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | union acpi_object arg; |
| 210 | unsigned long current_status; |
| 211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /* Issue the _EJ0 command */ |
| 214 | arg_list.count = 1; |
| 215 | arg_list.pointer = &arg; |
| 216 | arg.type = ACPI_TYPE_INTEGER; |
| 217 | arg.integer.value = 1; |
| 218 | status = acpi_evaluate_object(mem_device->handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 219 | "_EJ0", &arg_list, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | /* Return on _EJ0 failure */ |
| 221 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 222 | ACPI_EXCEPTION((AE_INFO, status, "_EJ0 failed")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 223 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | /* Evalute _STA to check if the device is disabled */ |
| 227 | status = acpi_evaluate_integer(mem_device->handle, "_STA", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 228 | NULL, ¤t_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 230 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
| 232 | /* Check for device status. Device should be disabled */ |
| 233 | if (current_status & ACPI_MEMORY_STA_ENABLED) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 234 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 236 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 239 | static int acpi_memory_disable_device(struct acpi_memory_device *mem_device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
| 241 | int result; |
| 242 | u64 start = mem_device->start_addr; |
Bjorn Helgaas | 459c726 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 243 | u64 len = mem_device->length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | /* |
| 247 | * Ask the VM to offline this memory range. |
| 248 | * Note: Assume that this function returns zero on success |
| 249 | */ |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 250 | result = remove_memory(start, len); |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 251 | if (result) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 252 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | /* Power-off and eject the device */ |
| 255 | result = acpi_memory_powerdown_device(mem_device); |
| 256 | if (result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | /* Set the status of the device to invalid */ |
| 258 | mem_device->state = MEMORY_INVALID_STATE; |
| 259 | return result; |
| 260 | } |
| 261 | |
| 262 | mem_device->state = MEMORY_POWER_OFF_STATE; |
| 263 | return result; |
| 264 | } |
| 265 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 266 | 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] | 267 | { |
| 268 | struct acpi_memory_device *mem_device; |
| 269 | struct acpi_device *device; |
| 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | switch (event) { |
| 273 | case ACPI_NOTIFY_BUS_CHECK: |
| 274 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 275 | "\nReceived BUS CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | /* Fall Through */ |
| 277 | case ACPI_NOTIFY_DEVICE_CHECK: |
| 278 | if (event == ACPI_NOTIFY_DEVICE_CHECK) |
| 279 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 280 | "\nReceived DEVICE CHECK notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (acpi_memory_get_device(handle, &mem_device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 282 | printk(KERN_ERR PREFIX "Cannot find driver data\n"); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 283 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | if (!acpi_memory_check_device(mem_device)) { |
| 287 | if (acpi_memory_enable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 288 | printk(KERN_ERR PREFIX |
| 289 | "Cannot enable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
| 291 | break; |
| 292 | case ACPI_NOTIFY_EJECT_REQUEST: |
| 293 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 294 | "\nReceived EJECT REQUEST notification for device\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
| 296 | if (acpi_bus_get_device(handle, &device)) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 297 | printk(KERN_ERR PREFIX "Device doesn't exist\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | break; |
| 299 | } |
| 300 | mem_device = acpi_driver_data(device); |
| 301 | if (!mem_device) { |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 302 | printk(KERN_ERR PREFIX "Driver Data is NULL\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | break; |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Currently disabling memory device from kernel mode |
| 308 | * TBD: Can also be disabled from user mode scripts |
| 309 | * TBD: Can also be disabled by Callback registration |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 310 | * with generic sysfs driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | */ |
| 312 | if (acpi_memory_disable_device(mem_device)) |
Len Brown | 6468463 | 2006-06-26 23:41:38 -0400 | [diff] [blame] | 313 | printk(KERN_ERR PREFIX |
| 314 | "Disable memory device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | /* |
| 316 | * TBD: Invoke acpi_bus_remove to cleanup data structures |
| 317 | */ |
| 318 | break; |
| 319 | default: |
| 320 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 321 | "Unsupported event [0x%x]\n", event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | break; |
| 323 | } |
| 324 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 325 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
| 327 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 328 | static int acpi_memory_device_add(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | { |
| 330 | int result; |
| 331 | struct acpi_memory_device *mem_device = NULL; |
| 332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | if (!device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 335 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
| 337 | mem_device = kmalloc(sizeof(struct acpi_memory_device), GFP_KERNEL); |
| 338 | if (!mem_device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 339 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | memset(mem_device, 0, sizeof(struct acpi_memory_device)); |
| 341 | |
| 342 | mem_device->handle = device->handle; |
| 343 | sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME); |
| 344 | sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS); |
| 345 | acpi_driver_data(device) = mem_device; |
| 346 | |
| 347 | /* Get the range from the _CRS */ |
| 348 | result = acpi_memory_get_device_resources(mem_device); |
| 349 | if (result) { |
| 350 | kfree(mem_device); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 351 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | /* Set the device state */ |
| 355 | mem_device->state = MEMORY_POWER_ON_STATE; |
| 356 | |
| 357 | printk(KERN_INFO "%s \n", acpi_device_name(device)); |
| 358 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 359 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } |
| 361 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 362 | static int acpi_memory_device_remove(struct acpi_device *device, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | { |
| 364 | struct acpi_memory_device *mem_device = NULL; |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
| 367 | if (!device || !acpi_driver_data(device)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 368 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 370 | mem_device = (struct acpi_memory_device *)acpi_driver_data(device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | kfree(mem_device); |
| 372 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 373 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Helper function to check for memory device |
| 378 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 379 | static acpi_status is_memory_device(acpi_handle handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
| 381 | char *hardware_id; |
| 382 | acpi_status status; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 383 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | struct acpi_device_info *info; |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
| 387 | status = acpi_get_object_info(handle, &buffer); |
| 388 | if (ACPI_FAILURE(status)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 389 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | info = buffer.pointer; |
| 392 | if (!(info->valid & ACPI_VALID_HID)) { |
| 393 | acpi_os_free(buffer.pointer); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 394 | return AE_ERROR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | hardware_id = info->hardware_id.value; |
| 398 | if ((hardware_id == NULL) || |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 399 | (strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | status = AE_ERROR; |
| 401 | |
| 402 | acpi_os_free(buffer.pointer); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 403 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 407 | acpi_memory_register_notify_handler(acpi_handle handle, |
| 408 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
| 410 | acpi_status status; |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | status = is_memory_device(handle); |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 414 | if (ACPI_FAILURE(status)){ |
| 415 | ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 416 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 419 | status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
| 420 | acpi_memory_device_notify, NULL); |
| 421 | /* continue */ |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 422 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 426 | acpi_memory_deregister_notify_handler(acpi_handle handle, |
| 427 | u32 level, void *ctxt, void **retv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | { |
| 429 | acpi_status status; |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | status = is_memory_device(handle); |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 433 | if (ACPI_FAILURE(status)){ |
| 434 | ACPI_EXCEPTION((AE_INFO, status, "handle is no memory device")); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 435 | return AE_OK; /* continue */ |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 436 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | status = acpi_remove_notify_handler(handle, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 439 | ACPI_SYSTEM_NOTIFY, |
| 440 | acpi_memory_device_notify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 442 | return AE_OK; /* continue */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | } |
| 444 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 445 | static int __init acpi_memory_device_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | { |
| 447 | int result; |
| 448 | acpi_status status; |
| 449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
| 451 | result = acpi_bus_register_driver(&acpi_memory_device_driver); |
| 452 | |
| 453 | if (result < 0) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 454 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 457 | ACPI_UINT32_MAX, |
| 458 | acpi_memory_register_notify_handler, |
| 459 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 461 | if (ACPI_FAILURE(status)) { |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 462 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 464 | return -ENODEV; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 465 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 467 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 470 | static void __exit acpi_memory_device_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | { |
| 472 | acpi_status status; |
| 473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | /* |
| 476 | * Adding this to un-install notification handlers for all the device |
| 477 | * handles. |
| 478 | */ |
| 479 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 480 | ACPI_UINT32_MAX, |
| 481 | acpi_memory_deregister_notify_handler, |
| 482 | NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 484 | if (ACPI_FAILURE(status)) |
Thomas Renninger | a6fc672 | 2006-06-26 23:58:43 -0400 | [diff] [blame] | 485 | ACPI_EXCEPTION((AE_INFO, status, "walk_namespace failed")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
| 487 | acpi_bus_unregister_driver(&acpi_memory_device_driver); |
| 488 | |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame^] | 489 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | module_init(acpi_memory_device_init); |
| 493 | module_exit(acpi_memory_device_exit); |