Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ACPI PCI Hot Plug IBM Extension |
| 3 | * |
| 4 | * Copyright (C) 2004 Vernon Mauery <vernux@us.ibm.com> |
| 5 | * Copyright (C) 2004 IBM Corp. |
| 6 | * |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or (at |
| 12 | * your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 17 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 18 | * details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | * |
| 24 | * Send feedback to <vernux@us.ibm.com> |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <acpi/acpi_bus.h> |
| 32 | #include <linux/sysfs.h> |
| 33 | #include <linux/kobject.h> |
| 34 | #include <asm/uaccess.h> |
| 35 | #include <linux/moduleparam.h> |
Alex Chiang | f46753c | 2008-06-10 15:28:50 -0600 | [diff] [blame] | 36 | #include <linux/pci.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include "acpiphp.h" |
Alex Chiang | f46753c | 2008-06-10 15:28:50 -0600 | [diff] [blame] | 39 | #include "../pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #define DRIVER_VERSION "1.0.1" |
| 42 | #define DRIVER_AUTHOR "Irene Zubarev <zubarev@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>" |
| 43 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver IBM extension" |
| 44 | |
| 45 | static int debug; |
| 46 | |
| 47 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 48 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 49 | MODULE_LICENSE("GPL"); |
| 50 | MODULE_VERSION(DRIVER_VERSION); |
| 51 | module_param(debug, bool, 0644); |
| 52 | MODULE_PARM_DESC(debug, " Debugging mode enabled or not"); |
| 53 | #define MY_NAME "acpiphp_ibm" |
| 54 | |
| 55 | #undef dbg |
| 56 | #define dbg(format, arg...) \ |
| 57 | do { \ |
| 58 | if (debug) \ |
| 59 | printk(KERN_DEBUG "%s: " format, \ |
| 60 | MY_NAME , ## arg); \ |
| 61 | } while (0) |
| 62 | |
| 63 | #define FOUND_APCI 0x61504349 |
| 64 | /* these are the names for the IBM ACPI pseudo-device */ |
| 65 | #define IBM_HARDWARE_ID1 "IBM37D0" |
| 66 | #define IBM_HARDWARE_ID2 "IBM37D4" |
| 67 | |
| 68 | #define hpslot_to_sun(A) (((struct slot *)((A)->private))->acpi_slot->sun) |
| 69 | |
| 70 | /* union apci_descriptor - allows access to the |
| 71 | * various device descriptors that are embedded in the |
| 72 | * aPCI table |
| 73 | */ |
| 74 | union apci_descriptor { |
| 75 | struct { |
| 76 | char sig[4]; |
| 77 | u8 len; |
| 78 | } header; |
| 79 | struct { |
| 80 | u8 type; |
| 81 | u8 len; |
| 82 | u16 slot_id; |
| 83 | u8 bus_id; |
| 84 | u8 dev_num; |
| 85 | u8 slot_num; |
| 86 | u8 slot_attr[2]; |
| 87 | u8 attn; |
| 88 | u8 status[2]; |
| 89 | u8 sun; |
| 90 | u8 res[3]; |
| 91 | } slot; |
| 92 | struct { |
| 93 | u8 type; |
| 94 | u8 len; |
| 95 | } generic; |
| 96 | }; |
| 97 | |
| 98 | /* struct notification - keeps info about the device |
| 99 | * that cause the ACPI notification event |
| 100 | */ |
| 101 | struct notification { |
| 102 | struct acpi_device *device; |
| 103 | u8 event; |
| 104 | }; |
| 105 | |
| 106 | static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status); |
| 107 | static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status); |
| 108 | static void ibm_handle_events(acpi_handle handle, u32 event, void *context); |
| 109 | static int ibm_get_table_from_acpi(char **bufp); |
| 110 | static ssize_t ibm_read_apci_table(struct kobject *kobj, |
Zhang Rui | 91a6902 | 2007-06-09 13:57:22 +0800 | [diff] [blame] | 111 | struct bin_attribute *bin_attr, |
| 112 | char *buffer, loff_t pos, size_t size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | static acpi_status __init ibm_find_acpi_device(acpi_handle handle, |
| 114 | u32 lvl, void *context, void **rv); |
| 115 | static int __init ibm_acpiphp_init(void); |
| 116 | static void __exit ibm_acpiphp_exit(void); |
| 117 | |
| 118 | static acpi_handle ibm_acpi_handle; |
| 119 | static struct notification ibm_note; |
| 120 | static struct bin_attribute ibm_apci_table_attr = { |
| 121 | .attr = { |
| 122 | .name = "apci_table", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | .mode = S_IRUGO, |
| 124 | }, |
| 125 | .read = ibm_read_apci_table, |
| 126 | .write = NULL, |
| 127 | }; |
| 128 | static struct acpiphp_attention_info ibm_attention_info = |
| 129 | { |
| 130 | .set_attn = ibm_set_attention_status, |
| 131 | .get_attn = ibm_get_attention_status, |
| 132 | .owner = THIS_MODULE, |
| 133 | }; |
| 134 | |
| 135 | /** |
| 136 | * ibm_slot_from_id - workaround for bad ibm hardware |
| 137 | * @id: the slot number that linux refers to the slot by |
| 138 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 139 | * Description: This method returns the aCPI slot descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | * corresponding to the Linux slot number. This descriptor |
| 141 | * has info about the aPCI slot id and attention status. |
| 142 | * This descriptor must be freed using kfree when done. |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 143 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | static union apci_descriptor *ibm_slot_from_id(int id) |
| 145 | { |
| 146 | int ind = 0, size; |
| 147 | union apci_descriptor *ret = NULL, *des; |
| 148 | char *table; |
| 149 | |
| 150 | size = ibm_get_table_from_acpi(&table); |
| 151 | des = (union apci_descriptor *)table; |
| 152 | if (memcmp(des->header.sig, "aPCI", 4) != 0) |
| 153 | goto ibm_slot_done; |
| 154 | |
| 155 | des = (union apci_descriptor *)&table[ind += des->header.len]; |
| 156 | while (ind < size && (des->generic.type != 0x82 || |
| 157 | des->slot.slot_num != id)) { |
| 158 | des = (union apci_descriptor *)&table[ind += des->generic.len]; |
| 159 | } |
| 160 | |
| 161 | if (ind < size && des->slot.slot_num == id) |
| 162 | ret = des; |
| 163 | |
| 164 | ibm_slot_done: |
| 165 | if (ret) { |
| 166 | ret = kmalloc(sizeof(union apci_descriptor), GFP_KERNEL); |
| 167 | memcpy(ret, des, sizeof(union apci_descriptor)); |
| 168 | } |
| 169 | kfree(table); |
| 170 | return ret; |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * ibm_set_attention_status - callback method to set the attention LED |
| 175 | * @slot: the hotplug_slot to work with |
| 176 | * @status: what to set the LED to (0 or 1) |
| 177 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 178 | * Description: This method is registered with the acpiphp module as a |
| 179 | * callback to do the device specific task of setting the LED status. |
| 180 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status) |
| 182 | { |
| 183 | union acpi_object args[2]; |
| 184 | struct acpi_object_list params = { .pointer = args, .count = 2 }; |
| 185 | acpi_status stat; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 186 | unsigned long long rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | union apci_descriptor *ibm_slot; |
| 188 | |
| 189 | ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot)); |
| 190 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 191 | dbg("%s: set slot %d (%d) attention status to %d\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | ibm_slot->slot.slot_num, ibm_slot->slot.slot_id, |
| 193 | (status ? 1 : 0)); |
| 194 | |
| 195 | args[0].type = ACPI_TYPE_INTEGER; |
| 196 | args[0].integer.value = ibm_slot->slot.slot_id; |
| 197 | args[1].type = ACPI_TYPE_INTEGER; |
| 198 | args[1].integer.value = (status) ? 1 : 0; |
| 199 | |
| 200 | kfree(ibm_slot); |
| 201 | |
| 202 | stat = acpi_evaluate_integer(ibm_acpi_handle, "APLS", ¶ms, &rc); |
| 203 | if (ACPI_FAILURE(stat)) { |
| 204 | err("APLS evaluation failed: 0x%08x\n", stat); |
| 205 | return -ENODEV; |
| 206 | } else if (!rc) { |
Randy Dunlap | 325dcfd | 2008-10-23 18:14:55 -0700 | [diff] [blame^] | 207 | err("APLS method failed: 0x%08llx\n", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | return -ERANGE; |
| 209 | } |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * ibm_get_attention_status - callback method to get attention LED status |
| 215 | * @slot: the hotplug_slot to work with |
| 216 | * @status: returns what the LED is set to (0 or 1) |
| 217 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 218 | * Description: This method is registered with the acpiphp module as a |
| 219 | * callback to do the device specific task of getting the LED status. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | * |
| 221 | * Because there is no direct method of getting the LED status directly |
| 222 | * from an ACPI call, we read the aPCI table and parse out our |
| 223 | * slot descriptor to read the status from that. |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 224 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status) |
| 226 | { |
| 227 | union apci_descriptor *ibm_slot; |
| 228 | |
| 229 | ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot)); |
| 230 | |
| 231 | if (ibm_slot->slot.attn & 0xa0 || ibm_slot->slot.status[1] & 0x08) |
| 232 | *status = 1; |
| 233 | else |
| 234 | *status = 0; |
| 235 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 236 | dbg("%s: get slot %d (%d) attention status is %d\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | ibm_slot->slot.slot_num, ibm_slot->slot.slot_id, |
| 238 | *status); |
| 239 | |
| 240 | kfree(ibm_slot); |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * ibm_handle_events - listens for ACPI events for the IBM37D0 device |
| 246 | * @handle: an ACPI handle to the device that caused the event |
| 247 | * @event: the event info (device specific) |
| 248 | * @context: passed context (our notification struct) |
| 249 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 250 | * Description: This method is registered as a callback with the ACPI |
| 251 | * subsystem it is called when this device has an event to notify the OS of. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | * |
| 253 | * The events actually come from the device as two events that get |
| 254 | * synthesized into one event with data by this function. The event |
| 255 | * ID comes first and then the slot number that caused it. We report |
| 256 | * this as one event to the OS. |
| 257 | * |
| 258 | * From section 5.6.2.2 of the ACPI 2.0 spec, I understand that the OSPM will |
| 259 | * only re-enable the interrupt that causes this event AFTER this method |
| 260 | * has returned, thereby enforcing serial access for the notification struct. |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 261 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | static void ibm_handle_events(acpi_handle handle, u32 event, void *context) |
| 263 | { |
| 264 | u8 detail = event & 0x0f; |
| 265 | u8 subevent = event & 0xf0; |
| 266 | struct notification *note = context; |
| 267 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 268 | dbg("%s: Received notification %02x\n", __func__, event); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
| 270 | if (subevent == 0x80) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 271 | dbg("%s: generationg bus event\n", __func__); |
Len Brown | 14e04fb | 2007-08-23 15:20:26 -0400 | [diff] [blame] | 272 | acpi_bus_generate_proc_event(note->device, note->event, detail); |
Zhang Rui | 962ce8c | 2007-08-23 01:24:31 +0800 | [diff] [blame] | 273 | acpi_bus_generate_netlink_event(note->device->pnp.device_class, |
| 274 | note->device->dev.bus_id, |
| 275 | note->event, detail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | } else |
| 277 | note->event = event; |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * ibm_get_table_from_acpi - reads the APLS buffer from ACPI |
| 282 | * @bufp: address to pointer to allocate for the table |
| 283 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 284 | * Description: This method reads the APLS buffer in from ACPI and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | * stores the "stripped" table into a single buffer |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 286 | * it allocates and passes the address back in bufp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | * |
| 288 | * If NULL is passed in as buffer, this method only calculates |
| 289 | * the size of the table and returns that without filling |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 290 | * in the buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 292 | * Returns < 0 on error or the size of the table on success. |
| 293 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | static int ibm_get_table_from_acpi(char **bufp) |
| 295 | { |
| 296 | union acpi_object *package; |
| 297 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 298 | acpi_status status; |
| 299 | char *lbuf = NULL; |
| 300 | int i, size = -EIO; |
| 301 | |
| 302 | status = acpi_evaluate_object(ibm_acpi_handle, "APCI", NULL, &buffer); |
| 303 | if (ACPI_FAILURE(status)) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 304 | err("%s: APCI evaluation failed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | return -ENODEV; |
| 306 | } |
| 307 | |
| 308 | package = (union acpi_object *) buffer.pointer; |
Pavel Machek | 072888f | 2006-01-08 20:11:59 +0100 | [diff] [blame] | 309 | if (!(package) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | (package->type != ACPI_TYPE_PACKAGE) || |
| 311 | !(package->package.elements)) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 312 | err("%s: Invalid APCI object\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | goto read_table_done; |
| 314 | } |
| 315 | |
| 316 | for(size = 0, i = 0; i < package->package.count; i++) { |
| 317 | if (package->package.elements[i].type != ACPI_TYPE_BUFFER) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 318 | err("%s: Invalid APCI element %d\n", __func__, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | goto read_table_done; |
| 320 | } |
| 321 | size += package->package.elements[i].buffer.length; |
| 322 | } |
| 323 | |
| 324 | if (bufp == NULL) |
| 325 | goto read_table_done; |
| 326 | |
Burman Yan | 36bcbec | 2006-12-19 12:56:11 -0800 | [diff] [blame] | 327 | lbuf = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | dbg("%s: element count: %i, ASL table size: %i, &table = 0x%p\n", |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 329 | __func__, package->package.count, size, lbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | if (lbuf) { |
| 332 | *bufp = lbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } else { |
| 334 | size = -ENOMEM; |
| 335 | goto read_table_done; |
| 336 | } |
| 337 | |
| 338 | size = 0; |
| 339 | for (i=0; i<package->package.count; i++) { |
| 340 | memcpy(&lbuf[size], |
| 341 | package->package.elements[i].buffer.pointer, |
| 342 | package->package.elements[i].buffer.length); |
| 343 | size += package->package.elements[i].buffer.length; |
| 344 | } |
| 345 | |
| 346 | read_table_done: |
| 347 | kfree(buffer.pointer); |
| 348 | return size; |
| 349 | } |
| 350 | |
| 351 | /** |
| 352 | * ibm_read_apci_table - callback for the sysfs apci_table file |
| 353 | * @kobj: the kobject this binary attribute is a part of |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 354 | * @bin_attr: struct bin_attribute for this file |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | * @buffer: the kernel space buffer to fill |
| 356 | * @pos: the offset into the file |
| 357 | * @size: the number of bytes requested |
| 358 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 359 | * Description: Gets registered with sysfs as the reader callback |
| 360 | * to be executed when /sys/bus/pci/slots/apci_table gets read. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | * |
| 362 | * Since we don't get notified on open and close for this file, |
| 363 | * things get really tricky here... |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 364 | * our solution is to only allow reading the table in all at once. |
| 365 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | static ssize_t ibm_read_apci_table(struct kobject *kobj, |
Zhang Rui | 91a6902 | 2007-06-09 13:57:22 +0800 | [diff] [blame] | 367 | struct bin_attribute *bin_attr, |
| 368 | char *buffer, loff_t pos, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
| 370 | int bytes_read = -EINVAL; |
| 371 | char *table = NULL; |
| 372 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 373 | dbg("%s: pos = %d, size = %zd\n", __func__, (int)pos, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | if (pos == 0) { |
| 376 | bytes_read = ibm_get_table_from_acpi(&table); |
| 377 | if (bytes_read > 0 && bytes_read <= size) |
| 378 | memcpy(buffer, table, bytes_read); |
| 379 | kfree(table); |
| 380 | } |
| 381 | return bytes_read; |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * ibm_find_acpi_device - callback to find our ACPI device |
| 386 | * @handle: the ACPI handle of the device we are inspecting |
| 387 | * @lvl: depth into the namespace tree |
| 388 | * @context: a pointer to our handle to fill when we find the device |
| 389 | * @rv: a return value to fill if desired |
| 390 | * |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 391 | * Description: Used as a callback when calling acpi_walk_namespace |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * to find our device. When this method returns non-zero |
Randy Dunlap | 26e6c66 | 2007-11-28 09:04:30 -0800 | [diff] [blame] | 393 | * acpi_walk_namespace quits its search and returns our value. |
| 394 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | static acpi_status __init ibm_find_acpi_device(acpi_handle handle, |
| 396 | u32 lvl, void *context, void **rv) |
| 397 | { |
| 398 | acpi_handle *phandle = (acpi_handle *)context; |
| 399 | acpi_status status; |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 400 | struct acpi_device_info *info; |
| 401 | struct acpi_buffer info_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 402 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | status = acpi_get_object_info(handle, &info_buffer); |
| 405 | if (ACPI_FAILURE(status)) { |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 406 | err("%s: Failed to get device information status=0x%x\n", |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 407 | __func__, status); |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 408 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | } |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 410 | info = info_buffer.pointer; |
| 411 | info->hardware_id.value[sizeof(info->hardware_id.value) - 1] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 413 | if (info->current_status && (info->valid & ACPI_VALID_HID) && |
| 414 | (!strcmp(info->hardware_id.value, IBM_HARDWARE_ID1) || |
| 415 | !strcmp(info->hardware_id.value, IBM_HARDWARE_ID2))) { |
| 416 | dbg("found hardware: %s, handle: %p\n", |
| 417 | info->hardware_id.value, handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | *phandle = handle; |
| 419 | /* returning non-zero causes the search to stop |
| 420 | * and returns this value to the caller of |
| 421 | * acpi_walk_namespace, but it also causes some warnings |
| 422 | * in the acpi debug code to print... |
| 423 | */ |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 424 | retval = FOUND_APCI; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
Gary Hade | 498fbb5 | 2008-02-06 15:43:05 -0800 | [diff] [blame] | 426 | kfree(info); |
| 427 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | static int __init ibm_acpiphp_init(void) |
| 431 | { |
| 432 | int retval = 0; |
| 433 | acpi_status status; |
| 434 | struct acpi_device *device; |
Alex Chiang | f46753c | 2008-06-10 15:28:50 -0600 | [diff] [blame] | 435 | struct kobject *sysdir = &pci_slots_kset->kobj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 437 | dbg("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | if (acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| 440 | ACPI_UINT32_MAX, ibm_find_acpi_device, |
| 441 | &ibm_acpi_handle, NULL) != FOUND_APCI) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 442 | err("%s: acpi_walk_namespace failed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | retval = -ENODEV; |
| 444 | goto init_return; |
| 445 | } |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 446 | dbg("%s: found IBM aPCI device\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | if (acpi_bus_get_device(ibm_acpi_handle, &device)) { |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 448 | err("%s: acpi_bus_get_device failed\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | retval = -ENODEV; |
| 450 | goto init_return; |
| 451 | } |
| 452 | if (acpiphp_register_attention(&ibm_attention_info)) { |
| 453 | retval = -ENODEV; |
| 454 | goto init_return; |
| 455 | } |
| 456 | |
| 457 | ibm_note.device = device; |
Pavel Machek | 072888f | 2006-01-08 20:11:59 +0100 | [diff] [blame] | 458 | status = acpi_install_notify_handler(ibm_acpi_handle, |
| 459 | ACPI_DEVICE_NOTIFY, ibm_handle_events, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | &ibm_note); |
| 461 | if (ACPI_FAILURE(status)) { |
Pavel Machek | 072888f | 2006-01-08 20:11:59 +0100 | [diff] [blame] | 462 | err("%s: Failed to register notification handler\n", |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 463 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | retval = -EBUSY; |
| 465 | goto init_cleanup; |
| 466 | } |
| 467 | |
| 468 | ibm_apci_table_attr.size = ibm_get_table_from_acpi(NULL); |
| 469 | retval = sysfs_create_bin_file(sysdir, &ibm_apci_table_attr); |
| 470 | |
| 471 | return retval; |
| 472 | |
| 473 | init_cleanup: |
| 474 | acpiphp_unregister_attention(&ibm_attention_info); |
| 475 | init_return: |
| 476 | return retval; |
| 477 | } |
| 478 | |
| 479 | static void __exit ibm_acpiphp_exit(void) |
| 480 | { |
| 481 | acpi_status status; |
Alex Chiang | f46753c | 2008-06-10 15:28:50 -0600 | [diff] [blame] | 482 | struct kobject *sysdir = &pci_slots_kset->kobj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 484 | dbg("%s\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | if (acpiphp_unregister_attention(&ibm_attention_info)) |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 487 | err("%s: attention info deregistration failed", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Pavel Machek | 072888f | 2006-01-08 20:11:59 +0100 | [diff] [blame] | 489 | status = acpi_remove_notify_handler( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | ibm_acpi_handle, |
| 491 | ACPI_DEVICE_NOTIFY, |
| 492 | ibm_handle_events); |
Pavel Machek | 072888f | 2006-01-08 20:11:59 +0100 | [diff] [blame] | 493 | if (ACPI_FAILURE(status)) |
Harvey Harrison | 66bef8c | 2008-03-03 19:09:46 -0800 | [diff] [blame] | 494 | err("%s: Notification handler removal failed\n", __func__); |
Pavel Machek | 072888f | 2006-01-08 20:11:59 +0100 | [diff] [blame] | 495 | /* remove the /sys entries */ |
Randy.Dunlap | 995982c | 2006-07-10 23:05:25 -0700 | [diff] [blame] | 496 | sysfs_remove_bin_file(sysdir, &ibm_apci_table_attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | module_init(ibm_acpiphp_init); |
| 500 | module_exit(ibm_acpiphp_exit); |