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28#define pr_fmt(fmt) "acpiphp_ibm: " fmt
29
30#include <linux/init.h>
31#include <linux/slab.h>
32#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/sysfs.h>
35#include <linux/kobject.h>
36#include <linux/moduleparam.h>
37#include <linux/pci.h>
38#include <asm/uaccess.h>
39
40#include "acpiphp.h"
41#include "../pci.h"
42
43#define DRIVER_VERSION "1.0.1"
44#define DRIVER_AUTHOR "Irene Zubarev <zubarev@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
45#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver IBM extension"
46
47
48MODULE_AUTHOR(DRIVER_AUTHOR);
49MODULE_DESCRIPTION(DRIVER_DESC);
50MODULE_LICENSE("GPL");
51MODULE_VERSION(DRIVER_VERSION);
52
53#define FOUND_APCI 0x61504349
54
55#define IBM_HARDWARE_ID1 "IBM37D0"
56#define IBM_HARDWARE_ID2 "IBM37D4"
57
58#define hpslot_to_sun(A) (((struct slot *)((A)->private))->sun)
59
60
61
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63
64union apci_descriptor {
65 struct {
66 char sig[4];
67 u8 len;
68 } header;
69 struct {
70 u8 type;
71 u8 len;
72 u16 slot_id;
73 u8 bus_id;
74 u8 dev_num;
75 u8 slot_num;
76 u8 slot_attr[2];
77 u8 attn;
78 u8 status[2];
79 u8 sun;
80 u8 res[3];
81 } slot;
82 struct {
83 u8 type;
84 u8 len;
85 } generic;
86};
87
88
89
90
91struct notification {
92 struct acpi_device *device;
93 u8 event;
94};
95
96static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status);
97static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status);
98static void ibm_handle_events(acpi_handle handle, u32 event, void *context);
99static int ibm_get_table_from_acpi(char **bufp);
100static ssize_t ibm_read_apci_table(struct file *filp, struct kobject *kobj,
101 struct bin_attribute *bin_attr,
102 char *buffer, loff_t pos, size_t size);
103static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
104 u32 lvl, void *context, void **rv);
105static int __init ibm_acpiphp_init(void);
106static void __exit ibm_acpiphp_exit(void);
107
108static acpi_handle ibm_acpi_handle;
109static struct notification ibm_note;
110static struct bin_attribute ibm_apci_table_attr = {
111 .attr = {
112 .name = "apci_table",
113 .mode = S_IRUGO,
114 },
115 .read = ibm_read_apci_table,
116 .write = NULL,
117};
118static struct acpiphp_attention_info ibm_attention_info =
119{
120 .set_attn = ibm_set_attention_status,
121 .get_attn = ibm_get_attention_status,
122 .owner = THIS_MODULE,
123};
124
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133
134static union apci_descriptor *ibm_slot_from_id(int id)
135{
136 int ind = 0, size;
137 union apci_descriptor *ret = NULL, *des;
138 char *table;
139
140 size = ibm_get_table_from_acpi(&table);
141 des = (union apci_descriptor *)table;
142 if (memcmp(des->header.sig, "aPCI", 4) != 0)
143 goto ibm_slot_done;
144
145 des = (union apci_descriptor *)&table[ind += des->header.len];
146 while (ind < size && (des->generic.type != 0x82 ||
147 des->slot.slot_num != id)) {
148 des = (union apci_descriptor *)&table[ind += des->generic.len];
149 }
150
151 if (ind < size && des->slot.slot_num == id)
152 ret = des;
153
154ibm_slot_done:
155 if (ret) {
156 ret = kmalloc(sizeof(union apci_descriptor), GFP_KERNEL);
157 memcpy(ret, des, sizeof(union apci_descriptor));
158 }
159 kfree(table);
160 return ret;
161}
162
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170
171static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status)
172{
173 union acpi_object args[2];
174 struct acpi_object_list params = { .pointer = args, .count = 2 };
175 acpi_status stat;
176 unsigned long long rc;
177 union apci_descriptor *ibm_slot;
178
179 ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
180
181 pr_debug("%s: set slot %d (%d) attention status to %d\n", __func__,
182 ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
183 (status ? 1 : 0));
184
185 args[0].type = ACPI_TYPE_INTEGER;
186 args[0].integer.value = ibm_slot->slot.slot_id;
187 args[1].type = ACPI_TYPE_INTEGER;
188 args[1].integer.value = (status) ? 1 : 0;
189
190 kfree(ibm_slot);
191
192 stat = acpi_evaluate_integer(ibm_acpi_handle, "APLS", ¶ms, &rc);
193 if (ACPI_FAILURE(stat)) {
194 pr_err("APLS evaluation failed: 0x%08x\n", stat);
195 return -ENODEV;
196 } else if (!rc) {
197 pr_err("APLS method failed: 0x%08llx\n", rc);
198 return -ERANGE;
199 }
200 return 0;
201}
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214
215static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status)
216{
217 union apci_descriptor *ibm_slot;
218
219 ibm_slot = ibm_slot_from_id(hpslot_to_sun(slot));
220
221 if (ibm_slot->slot.attn & 0xa0 || ibm_slot->slot.status[1] & 0x08)
222 *status = 1;
223 else
224 *status = 0;
225
226 pr_debug("%s: get slot %d (%d) attention status is %d\n", __func__,
227 ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
228 *status);
229
230 kfree(ibm_slot);
231 return 0;
232}
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252static void ibm_handle_events(acpi_handle handle, u32 event, void *context)
253{
254 u8 detail = event & 0x0f;
255 u8 subevent = event & 0xf0;
256 struct notification *note = context;
257
258 pr_debug("%s: Received notification %02x\n", __func__, event);
259
260 if (subevent == 0x80) {
261 pr_debug("%s: generating bus event\n", __func__);
262 acpi_bus_generate_netlink_event(note->device->pnp.device_class,
263 dev_name(¬e->device->dev),
264 note->event, detail);
265 } else
266 note->event = event;
267}
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283static int ibm_get_table_from_acpi(char **bufp)
284{
285 union acpi_object *package;
286 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
287 acpi_status status;
288 char *lbuf = NULL;
289 int i, size = -EIO;
290
291 status = acpi_evaluate_object(ibm_acpi_handle, "APCI", NULL, &buffer);
292 if (ACPI_FAILURE(status)) {
293 pr_err("%s: APCI evaluation failed\n", __func__);
294 return -ENODEV;
295 }
296
297 package = (union acpi_object *) buffer.pointer;
298 if (!(package) ||
299 (package->type != ACPI_TYPE_PACKAGE) ||
300 !(package->package.elements)) {
301 pr_err("%s: Invalid APCI object\n", __func__);
302 goto read_table_done;
303 }
304
305 for (size = 0, i = 0; i < package->package.count; i++) {
306 if (package->package.elements[i].type != ACPI_TYPE_BUFFER) {
307 pr_err("%s: Invalid APCI element %d\n", __func__, i);
308 goto read_table_done;
309 }
310 size += package->package.elements[i].buffer.length;
311 }
312
313 if (bufp == NULL)
314 goto read_table_done;
315
316 lbuf = kzalloc(size, GFP_KERNEL);
317 pr_debug("%s: element count: %i, ASL table size: %i, &table = 0x%p\n",
318 __func__, package->package.count, size, lbuf);
319
320 if (lbuf) {
321 *bufp = lbuf;
322 } else {
323 size = -ENOMEM;
324 goto read_table_done;
325 }
326
327 size = 0;
328 for (i=0; i<package->package.count; i++) {
329 memcpy(&lbuf[size],
330 package->package.elements[i].buffer.pointer,
331 package->package.elements[i].buffer.length);
332 size += package->package.elements[i].buffer.length;
333 }
334
335read_table_done:
336 kfree(buffer.pointer);
337 return size;
338}
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356static ssize_t ibm_read_apci_table(struct file *filp, struct kobject *kobj,
357 struct bin_attribute *bin_attr,
358 char *buffer, loff_t pos, size_t size)
359{
360 int bytes_read = -EINVAL;
361 char *table = NULL;
362
363 pr_debug("%s: pos = %d, size = %zd\n", __func__, (int)pos, size);
364
365 if (pos == 0) {
366 bytes_read = ibm_get_table_from_acpi(&table);
367 if (bytes_read > 0 && bytes_read <= size)
368 memcpy(buffer, table, bytes_read);
369 kfree(table);
370 }
371 return bytes_read;
372}
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385static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
386 u32 lvl, void *context, void **rv)
387{
388 acpi_handle *phandle = (acpi_handle *)context;
389 acpi_status status;
390 struct acpi_device_info *info;
391 int retval = 0;
392
393 status = acpi_get_object_info(handle, &info);
394 if (ACPI_FAILURE(status)) {
395 pr_err("%s: Failed to get device information status=0x%x\n",
396 __func__, status);
397 return retval;
398 }
399
400 if (info->current_status && (info->valid & ACPI_VALID_HID) &&
401 (!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||
402 !strcmp(info->hardware_id.string, IBM_HARDWARE_ID2))) {
403 pr_debug("found hardware: %s, handle: %p\n",
404 info->hardware_id.string, handle);
405 *phandle = handle;
406
407
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410
411 retval = FOUND_APCI;
412 }
413 kfree(info);
414 return retval;
415}
416
417static int __init ibm_acpiphp_init(void)
418{
419 int retval = 0;
420 acpi_status status;
421 struct acpi_device *device;
422 struct kobject *sysdir = &pci_slots_kset->kobj;
423
424 pr_debug("%s\n", __func__);
425
426 if (acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
427 ACPI_UINT32_MAX, ibm_find_acpi_device, NULL,
428 &ibm_acpi_handle, NULL) != FOUND_APCI) {
429 pr_err("%s: acpi_walk_namespace failed\n", __func__);
430 retval = -ENODEV;
431 goto init_return;
432 }
433 pr_debug("%s: found IBM aPCI device\n", __func__);
434 if (acpi_bus_get_device(ibm_acpi_handle, &device)) {
435 pr_err("%s: acpi_bus_get_device failed\n", __func__);
436 retval = -ENODEV;
437 goto init_return;
438 }
439 if (acpiphp_register_attention(&ibm_attention_info)) {
440 retval = -ENODEV;
441 goto init_return;
442 }
443
444 ibm_note.device = device;
445 status = acpi_install_notify_handler(ibm_acpi_handle,
446 ACPI_DEVICE_NOTIFY, ibm_handle_events,
447 &ibm_note);
448 if (ACPI_FAILURE(status)) {
449 pr_err("%s: Failed to register notification handler\n",
450 __func__);
451 retval = -EBUSY;
452 goto init_cleanup;
453 }
454
455 ibm_apci_table_attr.size = ibm_get_table_from_acpi(NULL);
456 retval = sysfs_create_bin_file(sysdir, &ibm_apci_table_attr);
457
458 return retval;
459
460init_cleanup:
461 acpiphp_unregister_attention(&ibm_attention_info);
462init_return:
463 return retval;
464}
465
466static void __exit ibm_acpiphp_exit(void)
467{
468 acpi_status status;
469 struct kobject *sysdir = &pci_slots_kset->kobj;
470
471 pr_debug("%s\n", __func__);
472
473 if (acpiphp_unregister_attention(&ibm_attention_info))
474 pr_err("%s: attention info deregistration failed", __func__);
475
476 status = acpi_remove_notify_handler(
477 ibm_acpi_handle,
478 ACPI_DEVICE_NOTIFY,
479 ibm_handle_events);
480 if (ACPI_FAILURE(status))
481 pr_err("%s: Notification handler removal failed\n", __func__);
482
483 sysfs_remove_bin_file(sysdir, &ibm_apci_table_attr);
484}
485
486module_init(ibm_acpiphp_init);
487module_exit(ibm_acpiphp_exit);
488