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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>
36#include <linux/pci.h>
37
38#include "acpiphp.h"
39#include "../pci.h"
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
45static int debug;
46
47MODULE_AUTHOR(DRIVER_AUTHOR);
48MODULE_DESCRIPTION(DRIVER_DESC);
49MODULE_LICENSE("GPL");
50MODULE_VERSION(DRIVER_VERSION);
51module_param(debug, bool, 0644);
52MODULE_PARM_DESC(debug, " Debugging mode enabled or not");
53#define MY_NAME "acpiphp_ibm"
54
55#undef dbg
56#define dbg(format, arg...) \
57do { \
58 if (debug) \
59 printk(KERN_DEBUG "%s: " format, \
60 MY_NAME , ## arg); \
61} while (0)
62
63#define FOUND_APCI 0x61504349
64
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
71
72
73
74union 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
99
100
101struct notification {
102 struct acpi_device *device;
103 u8 event;
104};
105
106static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status);
107static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status);
108static void ibm_handle_events(acpi_handle handle, u32 event, void *context);
109static int ibm_get_table_from_acpi(char **bufp);
110static ssize_t ibm_read_apci_table(struct kobject *kobj,
111 struct bin_attribute *bin_attr,
112 char *buffer, loff_t pos, size_t size);
113static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
114 u32 lvl, void *context, void **rv);
115static int __init ibm_acpiphp_init(void);
116static void __exit ibm_acpiphp_exit(void);
117
118static acpi_handle ibm_acpi_handle;
119static struct notification ibm_note;
120static struct bin_attribute ibm_apci_table_attr = {
121 .attr = {
122 .name = "apci_table",
123 .mode = S_IRUGO,
124 },
125 .read = ibm_read_apci_table,
126 .write = NULL,
127};
128static 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
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143
144static 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
164ibm_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
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180
181static 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;
186 unsigned long long rc;
187 union apci_descriptor *ibm_slot;
188
189 ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
190
191 dbg("%s: set slot %d (%d) attention status to %d\n", __func__,
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) {
207 err("APLS method failed: 0x%08llx\n", rc);
208 return -ERANGE;
209 }
210 return 0;
211}
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224
225static 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
236 dbg("%s: get slot %d (%d) attention status is %d\n", __func__,
237 ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
238 *status);
239
240 kfree(ibm_slot);
241 return 0;
242}
243
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261
262static 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
268 dbg("%s: Received notification %02x\n", __func__, event);
269
270 if (subevent == 0x80) {
271 dbg("%s: generationg bus event\n", __func__);
272 acpi_bus_generate_proc_event(note->device, note->event, detail);
273 acpi_bus_generate_netlink_event(note->device->pnp.device_class,
274 note->device->dev.bus_id,
275 note->event, detail);
276 } else
277 note->event = event;
278}
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293
294static 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)) {
304 err("%s: APCI evaluation failed\n", __func__);
305 return -ENODEV;
306 }
307
308 package = (union acpi_object *) buffer.pointer;
309 if (!(package) ||
310 (package->type != ACPI_TYPE_PACKAGE) ||
311 !(package->package.elements)) {
312 err("%s: Invalid APCI object\n", __func__);
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) {
318 err("%s: Invalid APCI element %d\n", __func__, i);
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
327 lbuf = kzalloc(size, GFP_KERNEL);
328 dbg("%s: element count: %i, ASL table size: %i, &table = 0x%p\n",
329 __func__, package->package.count, size, lbuf);
330
331 if (lbuf) {
332 *bufp = lbuf;
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
346read_table_done:
347 kfree(buffer.pointer);
348 return size;
349}
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366static ssize_t ibm_read_apci_table(struct kobject *kobj,
367 struct bin_attribute *bin_attr,
368 char *buffer, loff_t pos, size_t size)
369{
370 int bytes_read = -EINVAL;
371 char *table = NULL;
372
373 dbg("%s: pos = %d, size = %zd\n", __func__, (int)pos, size);
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}
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394
395static 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;
400 struct acpi_device_info *info;
401 struct acpi_buffer info_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
402 int retval = 0;
403
404 status = acpi_get_object_info(handle, &info_buffer);
405 if (ACPI_FAILURE(status)) {
406 err("%s: Failed to get device information status=0x%x\n",
407 __func__, status);
408 return retval;
409 }
410 info = info_buffer.pointer;
411 info->hardware_id.value[sizeof(info->hardware_id.value) - 1] = '\0';
412
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);
418 *phandle = handle;
419
420
421
422
423
424 retval = FOUND_APCI;
425 }
426 kfree(info);
427 return retval;
428}
429
430static int __init ibm_acpiphp_init(void)
431{
432 int retval = 0;
433 acpi_status status;
434 struct acpi_device *device;
435 struct kobject *sysdir = &pci_slots_kset->kobj;
436
437 dbg("%s\n", __func__);
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) {
442 err("%s: acpi_walk_namespace failed\n", __func__);
443 retval = -ENODEV;
444 goto init_return;
445 }
446 dbg("%s: found IBM aPCI device\n", __func__);
447 if (acpi_bus_get_device(ibm_acpi_handle, &device)) {
448 err("%s: acpi_bus_get_device failed\n", __func__);
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;
458 status = acpi_install_notify_handler(ibm_acpi_handle,
459 ACPI_DEVICE_NOTIFY, ibm_handle_events,
460 &ibm_note);
461 if (ACPI_FAILURE(status)) {
462 err("%s: Failed to register notification handler\n",
463 __func__);
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
473init_cleanup:
474 acpiphp_unregister_attention(&ibm_attention_info);
475init_return:
476 return retval;
477}
478
479static void __exit ibm_acpiphp_exit(void)
480{
481 acpi_status status;
482 struct kobject *sysdir = &pci_slots_kset->kobj;
483
484 dbg("%s\n", __func__);
485
486 if (acpiphp_unregister_attention(&ibm_attention_info))
487 err("%s: attention info deregistration failed", __func__);
488
489 status = acpi_remove_notify_handler(
490 ibm_acpi_handle,
491 ACPI_DEVICE_NOTIFY,
492 ibm_handle_events);
493 if (ACPI_FAILURE(status))
494 err("%s: Notification handler removal failed\n", __func__);
495
496 sysfs_remove_bin_file(sysdir, &ibm_apci_table_attr);
497}
498
499module_init(ibm_acpiphp_init);
500module_exit(ibm_acpiphp_exit);