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28#include <linux/init.h>
29#include <linux/slab.h>
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <acpi/acpi_bus.h>
33#include <linux/sysfs.h>
34#include <linux/kobject.h>
35#include <asm/uaccess.h>
36#include <linux/moduleparam.h>
37#include <linux/pci.h>
38
39#include "acpiphp.h"
40#include "../pci.h"
41
42#define DRIVER_VERSION "1.0.1"
43#define DRIVER_AUTHOR "Irene Zubarev <zubarev@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
44#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver IBM extension"
45
46static bool debug;
47
48MODULE_AUTHOR(DRIVER_AUTHOR);
49MODULE_DESCRIPTION(DRIVER_DESC);
50MODULE_LICENSE("GPL");
51MODULE_VERSION(DRIVER_VERSION);
52module_param(debug, bool, 0644);
53MODULE_PARM_DESC(debug, " Debugging mode enabled or not");
54#define MY_NAME "acpiphp_ibm"
55
56#undef dbg
57#define dbg(format, arg...) \
58do { \
59 if (debug) \
60 printk(KERN_DEBUG "%s: " format, \
61 MY_NAME , ## arg); \
62} while (0)
63
64#define FOUND_APCI 0x61504349
65
66#define IBM_HARDWARE_ID1 "IBM37D0"
67#define IBM_HARDWARE_ID2 "IBM37D4"
68
69#define hpslot_to_sun(A) (((struct slot *)((A)->private))->sun)
70
71
72
73
74
75union apci_descriptor {
76 struct {
77 char sig[4];
78 u8 len;
79 } header;
80 struct {
81 u8 type;
82 u8 len;
83 u16 slot_id;
84 u8 bus_id;
85 u8 dev_num;
86 u8 slot_num;
87 u8 slot_attr[2];
88 u8 attn;
89 u8 status[2];
90 u8 sun;
91 u8 res[3];
92 } slot;
93 struct {
94 u8 type;
95 u8 len;
96 } generic;
97};
98
99
100
101
102struct notification {
103 struct acpi_device *device;
104 u8 event;
105};
106
107static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status);
108static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status);
109static void ibm_handle_events(acpi_handle handle, u32 event, void *context);
110static int ibm_get_table_from_acpi(char **bufp);
111static ssize_t ibm_read_apci_table(struct file *filp, struct kobject *kobj,
112 struct bin_attribute *bin_attr,
113 char *buffer, loff_t pos, size_t size);
114static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
115 u32 lvl, void *context, void **rv);
116static int __init ibm_acpiphp_init(void);
117static void __exit ibm_acpiphp_exit(void);
118
119static acpi_handle ibm_acpi_handle;
120static struct notification ibm_note;
121static struct bin_attribute ibm_apci_table_attr = {
122 .attr = {
123 .name = "apci_table",
124 .mode = S_IRUGO,
125 },
126 .read = ibm_read_apci_table,
127 .write = NULL,
128};
129static struct acpiphp_attention_info ibm_attention_info =
130{
131 .set_attn = ibm_set_attention_status,
132 .get_attn = ibm_get_attention_status,
133 .owner = THIS_MODULE,
134};
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144
145static union apci_descriptor *ibm_slot_from_id(int id)
146{
147 int ind = 0, size;
148 union apci_descriptor *ret = NULL, *des;
149 char *table;
150
151 size = ibm_get_table_from_acpi(&table);
152 des = (union apci_descriptor *)table;
153 if (memcmp(des->header.sig, "aPCI", 4) != 0)
154 goto ibm_slot_done;
155
156 des = (union apci_descriptor *)&table[ind += des->header.len];
157 while (ind < size && (des->generic.type != 0x82 ||
158 des->slot.slot_num != id)) {
159 des = (union apci_descriptor *)&table[ind += des->generic.len];
160 }
161
162 if (ind < size && des->slot.slot_num == id)
163 ret = des;
164
165ibm_slot_done:
166 if (ret) {
167 ret = kmalloc(sizeof(union apci_descriptor), GFP_KERNEL);
168 memcpy(ret, des, sizeof(union apci_descriptor));
169 }
170 kfree(table);
171 return ret;
172}
173
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181
182static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status)
183{
184 union acpi_object args[2];
185 struct acpi_object_list params = { .pointer = args, .count = 2 };
186 acpi_status stat;
187 unsigned long long rc;
188 union apci_descriptor *ibm_slot;
189
190 ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
191
192 dbg("%s: set slot %d (%d) attention status to %d\n", __func__,
193 ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
194 (status ? 1 : 0));
195
196 args[0].type = ACPI_TYPE_INTEGER;
197 args[0].integer.value = ibm_slot->slot.slot_id;
198 args[1].type = ACPI_TYPE_INTEGER;
199 args[1].integer.value = (status) ? 1 : 0;
200
201 kfree(ibm_slot);
202
203 stat = acpi_evaluate_integer(ibm_acpi_handle, "APLS", ¶ms, &rc);
204 if (ACPI_FAILURE(stat)) {
205 err("APLS evaluation failed: 0x%08x\n", stat);
206 return -ENODEV;
207 } else if (!rc) {
208 err("APLS method failed: 0x%08llx\n", rc);
209 return -ERANGE;
210 }
211 return 0;
212}
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225
226static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status)
227{
228 union apci_descriptor *ibm_slot;
229
230 ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
231
232 if (ibm_slot->slot.attn & 0xa0 || ibm_slot->slot.status[1] & 0x08)
233 *status = 1;
234 else
235 *status = 0;
236
237 dbg("%s: get slot %d (%d) attention status is %d\n", __func__,
238 ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
239 *status);
240
241 kfree(ibm_slot);
242 return 0;
243}
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263static void ibm_handle_events(acpi_handle handle, u32 event, void *context)
264{
265 u8 detail = event & 0x0f;
266 u8 subevent = event & 0xf0;
267 struct notification *note = context;
268
269 dbg("%s: Received notification %02x\n", __func__, event);
270
271 if (subevent == 0x80) {
272 dbg("%s: generationg bus event\n", __func__);
273 acpi_bus_generate_netlink_event(note->device->pnp.device_class,
274 dev_name(¬e->device->dev),
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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367static ssize_t ibm_read_apci_table(struct file *filp, struct kobject *kobj,
368 struct bin_attribute *bin_attr,
369 char *buffer, loff_t pos, size_t size)
370{
371 int bytes_read = -EINVAL;
372 char *table = NULL;
373
374 dbg("%s: pos = %d, size = %zd\n", __func__, (int)pos, size);
375
376 if (pos == 0) {
377 bytes_read = ibm_get_table_from_acpi(&table);
378 if (bytes_read > 0 && bytes_read <= size)
379 memcpy(buffer, table, bytes_read);
380 kfree(table);
381 }
382 return bytes_read;
383}
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395
396static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
397 u32 lvl, void *context, void **rv)
398{
399 acpi_handle *phandle = (acpi_handle *)context;
400 acpi_status status;
401 struct acpi_device_info *info;
402 int retval = 0;
403
404 status = acpi_get_object_info(handle, &info);
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
411 if (info->current_status && (info->valid & ACPI_VALID_HID) &&
412 (!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||
413 !strcmp(info->hardware_id.string, IBM_HARDWARE_ID2))) {
414 dbg("found hardware: %s, handle: %p\n",
415 info->hardware_id.string, handle);
416 *phandle = handle;
417
418
419
420
421
422 retval = FOUND_APCI;
423 }
424 kfree(info);
425 return retval;
426}
427
428static int __init ibm_acpiphp_init(void)
429{
430 int retval = 0;
431 acpi_status status;
432 struct acpi_device *device;
433 struct kobject *sysdir = &pci_slots_kset->kobj;
434
435 dbg("%s\n", __func__);
436
437 if (acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
438 ACPI_UINT32_MAX, ibm_find_acpi_device, NULL,
439 &ibm_acpi_handle, NULL) != FOUND_APCI) {
440 err("%s: acpi_walk_namespace failed\n", __func__);
441 retval = -ENODEV;
442 goto init_return;
443 }
444 dbg("%s: found IBM aPCI device\n", __func__);
445 if (acpi_bus_get_device(ibm_acpi_handle, &device)) {
446 err("%s: acpi_bus_get_device failed\n", __func__);
447 retval = -ENODEV;
448 goto init_return;
449 }
450 if (acpiphp_register_attention(&ibm_attention_info)) {
451 retval = -ENODEV;
452 goto init_return;
453 }
454
455 ibm_note.device = device;
456 status = acpi_install_notify_handler(ibm_acpi_handle,
457 ACPI_DEVICE_NOTIFY, ibm_handle_events,
458 &ibm_note);
459 if (ACPI_FAILURE(status)) {
460 err("%s: Failed to register notification handler\n",
461 __func__);
462 retval = -EBUSY;
463 goto init_cleanup;
464 }
465
466 ibm_apci_table_attr.size = ibm_get_table_from_acpi(NULL);
467 retval = sysfs_create_bin_file(sysdir, &ibm_apci_table_attr);
468
469 return retval;
470
471init_cleanup:
472 acpiphp_unregister_attention(&ibm_attention_info);
473init_return:
474 return retval;
475}
476
477static void __exit ibm_acpiphp_exit(void)
478{
479 acpi_status status;
480 struct kobject *sysdir = &pci_slots_kset->kobj;
481
482 dbg("%s\n", __func__);
483
484 if (acpiphp_unregister_attention(&ibm_attention_info))
485 err("%s: attention info deregistration failed", __func__);
486
487 status = acpi_remove_notify_handler(
488 ibm_acpi_handle,
489 ACPI_DEVICE_NOTIFY,
490 ibm_handle_events);
491 if (ACPI_FAILURE(status))
492 err("%s: Notification handler removal failed\n", __func__);
493
494 sysfs_remove_bin_file(sysdir, &ibm_apci_table_attr);
495}
496
497module_init(ibm_acpiphp_init);
498module_exit(ibm_acpiphp_exit);
499