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28#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/kernel.h>
31#include <linux/types.h>
32#include <linux/list.h>
33#include <linux/kobject.h>
34#include <linux/sysfs.h>
35#include <linux/pagemap.h>
36#include <linux/init.h>
37#include <linux/mount.h>
38#include <linux/namei.h>
39#include <linux/mutex.h>
40#include <linux/pci.h>
41#include <linux/pci_hotplug.h>
42#include <asm/uaccess.h>
43#include "../pci.h"
44#include "cpci_hotplug.h"
45
46#define MY_NAME "pci_hotplug"
47
48#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
49#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
50#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
51#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
52
53
54
55static bool debug;
56
57#define DRIVER_VERSION "0.5"
58#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
59#define DRIVER_DESC "PCI Hot Plug PCI Core"
60
61
62
63
64static LIST_HEAD(pci_hotplug_slot_list);
65static DEFINE_MUTEX(pci_hp_mutex);
66
67
68#define GET_STATUS(name,type) \
69static int get_##name (struct hotplug_slot *slot, type *value) \
70{ \
71 struct hotplug_slot_ops *ops = slot->ops; \
72 int retval = 0; \
73 if (!try_module_get(ops->owner)) \
74 return -ENODEV; \
75 if (ops->get_##name) \
76 retval = ops->get_##name(slot, value); \
77 else \
78 *value = slot->info->name; \
79 module_put(ops->owner); \
80 return retval; \
81}
82
83GET_STATUS(power_status, u8)
84GET_STATUS(attention_status, u8)
85GET_STATUS(latch_status, u8)
86GET_STATUS(adapter_status, u8)
87
88static ssize_t power_read_file(struct pci_slot *slot, char *buf)
89{
90 int retval;
91 u8 value;
92
93 retval = get_power_status(slot->hotplug, &value);
94 if (retval)
95 goto exit;
96 retval = sprintf (buf, "%d\n", value);
97exit:
98 return retval;
99}
100
101static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
102 size_t count)
103{
104 struct hotplug_slot *slot = pci_slot->hotplug;
105 unsigned long lpower;
106 u8 power;
107 int retval = 0;
108
109 lpower = simple_strtoul (buf, NULL, 10);
110 power = (u8)(lpower & 0xff);
111 dbg ("power = %d\n", power);
112
113 if (!try_module_get(slot->ops->owner)) {
114 retval = -ENODEV;
115 goto exit;
116 }
117 switch (power) {
118 case 0:
119 if (slot->ops->disable_slot)
120 retval = slot->ops->disable_slot(slot);
121 break;
122
123 case 1:
124 if (slot->ops->enable_slot)
125 retval = slot->ops->enable_slot(slot);
126 break;
127
128 default:
129 err ("Illegal value specified for power\n");
130 retval = -EINVAL;
131 }
132 module_put(slot->ops->owner);
133
134exit:
135 if (retval)
136 return retval;
137 return count;
138}
139
140static struct pci_slot_attribute hotplug_slot_attr_power = {
141 .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
142 .show = power_read_file,
143 .store = power_write_file
144};
145
146static ssize_t attention_read_file(struct pci_slot *slot, char *buf)
147{
148 int retval;
149 u8 value;
150
151 retval = get_attention_status(slot->hotplug, &value);
152 if (retval)
153 goto exit;
154 retval = sprintf(buf, "%d\n", value);
155
156exit:
157 return retval;
158}
159
160static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
161 size_t count)
162{
163 struct hotplug_slot_ops *ops = slot->hotplug->ops;
164 unsigned long lattention;
165 u8 attention;
166 int retval = 0;
167
168 lattention = simple_strtoul (buf, NULL, 10);
169 attention = (u8)(lattention & 0xff);
170 dbg (" - attention = %d\n", attention);
171
172 if (!try_module_get(ops->owner)) {
173 retval = -ENODEV;
174 goto exit;
175 }
176 if (ops->set_attention_status)
177 retval = ops->set_attention_status(slot->hotplug, attention);
178 module_put(ops->owner);
179
180exit:
181 if (retval)
182 return retval;
183 return count;
184}
185
186static struct pci_slot_attribute hotplug_slot_attr_attention = {
187 .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
188 .show = attention_read_file,
189 .store = attention_write_file
190};
191
192static ssize_t latch_read_file(struct pci_slot *slot, char *buf)
193{
194 int retval;
195 u8 value;
196
197 retval = get_latch_status(slot->hotplug, &value);
198 if (retval)
199 goto exit;
200 retval = sprintf (buf, "%d\n", value);
201
202exit:
203 return retval;
204}
205
206static struct pci_slot_attribute hotplug_slot_attr_latch = {
207 .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
208 .show = latch_read_file,
209};
210
211static ssize_t presence_read_file(struct pci_slot *slot, char *buf)
212{
213 int retval;
214 u8 value;
215
216 retval = get_adapter_status(slot->hotplug, &value);
217 if (retval)
218 goto exit;
219 retval = sprintf (buf, "%d\n", value);
220
221exit:
222 return retval;
223}
224
225static struct pci_slot_attribute hotplug_slot_attr_presence = {
226 .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
227 .show = presence_read_file,
228};
229
230static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
231 size_t count)
232{
233 struct hotplug_slot *slot = pci_slot->hotplug;
234 unsigned long ltest;
235 u32 test;
236 int retval = 0;
237
238 ltest = simple_strtoul (buf, NULL, 10);
239 test = (u32)(ltest & 0xffffffff);
240 dbg ("test = %d\n", test);
241
242 if (!try_module_get(slot->ops->owner)) {
243 retval = -ENODEV;
244 goto exit;
245 }
246 if (slot->ops->hardware_test)
247 retval = slot->ops->hardware_test(slot, test);
248 module_put(slot->ops->owner);
249
250exit:
251 if (retval)
252 return retval;
253 return count;
254}
255
256static struct pci_slot_attribute hotplug_slot_attr_test = {
257 .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
258 .store = test_write_file
259};
260
261static bool has_power_file(struct pci_slot *pci_slot)
262{
263 struct hotplug_slot *slot = pci_slot->hotplug;
264 if ((!slot) || (!slot->ops))
265 return false;
266 if ((slot->ops->enable_slot) ||
267 (slot->ops->disable_slot) ||
268 (slot->ops->get_power_status))
269 return true;
270 return false;
271}
272
273static bool has_attention_file(struct pci_slot *pci_slot)
274{
275 struct hotplug_slot *slot = pci_slot->hotplug;
276 if ((!slot) || (!slot->ops))
277 return false;
278 if ((slot->ops->set_attention_status) ||
279 (slot->ops->get_attention_status))
280 return true;
281 return false;
282}
283
284static bool has_latch_file(struct pci_slot *pci_slot)
285{
286 struct hotplug_slot *slot = pci_slot->hotplug;
287 if ((!slot) || (!slot->ops))
288 return false;
289 if (slot->ops->get_latch_status)
290 return true;
291 return false;
292}
293
294static bool has_adapter_file(struct pci_slot *pci_slot)
295{
296 struct hotplug_slot *slot = pci_slot->hotplug;
297 if ((!slot) || (!slot->ops))
298 return false;
299 if (slot->ops->get_adapter_status)
300 return true;
301 return false;
302}
303
304static bool has_test_file(struct pci_slot *pci_slot)
305{
306 struct hotplug_slot *slot = pci_slot->hotplug;
307 if ((!slot) || (!slot->ops))
308 return false;
309 if (slot->ops->hardware_test)
310 return true;
311 return false;
312}
313
314static int fs_add_slot(struct pci_slot *slot)
315{
316 int retval = 0;
317
318
319 pci_hp_create_module_link(slot);
320
321 if (has_power_file(slot)) {
322 retval = sysfs_create_file(&slot->kobj,
323 &hotplug_slot_attr_power.attr);
324 if (retval)
325 goto exit_power;
326 }
327
328 if (has_attention_file(slot)) {
329 retval = sysfs_create_file(&slot->kobj,
330 &hotplug_slot_attr_attention.attr);
331 if (retval)
332 goto exit_attention;
333 }
334
335 if (has_latch_file(slot)) {
336 retval = sysfs_create_file(&slot->kobj,
337 &hotplug_slot_attr_latch.attr);
338 if (retval)
339 goto exit_latch;
340 }
341
342 if (has_adapter_file(slot)) {
343 retval = sysfs_create_file(&slot->kobj,
344 &hotplug_slot_attr_presence.attr);
345 if (retval)
346 goto exit_adapter;
347 }
348
349 if (has_test_file(slot)) {
350 retval = sysfs_create_file(&slot->kobj,
351 &hotplug_slot_attr_test.attr);
352 if (retval)
353 goto exit_test;
354 }
355
356 goto exit;
357
358exit_test:
359 if (has_adapter_file(slot))
360 sysfs_remove_file(&slot->kobj,
361 &hotplug_slot_attr_presence.attr);
362exit_adapter:
363 if (has_latch_file(slot))
364 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
365exit_latch:
366 if (has_attention_file(slot))
367 sysfs_remove_file(&slot->kobj,
368 &hotplug_slot_attr_attention.attr);
369exit_attention:
370 if (has_power_file(slot))
371 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
372exit_power:
373 pci_hp_remove_module_link(slot);
374exit:
375 return retval;
376}
377
378static void fs_remove_slot(struct pci_slot *slot)
379{
380 if (has_power_file(slot))
381 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
382
383 if (has_attention_file(slot))
384 sysfs_remove_file(&slot->kobj,
385 &hotplug_slot_attr_attention.attr);
386
387 if (has_latch_file(slot))
388 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
389
390 if (has_adapter_file(slot))
391 sysfs_remove_file(&slot->kobj,
392 &hotplug_slot_attr_presence.attr);
393
394 if (has_test_file(slot))
395 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
396
397 pci_hp_remove_module_link(slot);
398}
399
400static struct hotplug_slot *get_slot_from_name (const char *name)
401{
402 struct hotplug_slot *slot;
403 struct list_head *tmp;
404
405 list_for_each (tmp, &pci_hotplug_slot_list) {
406 slot = list_entry (tmp, struct hotplug_slot, slot_list);
407 if (strcmp(hotplug_slot_name(slot), name) == 0)
408 return slot;
409 }
410 return NULL;
411}
412
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425
426
427int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
428 int devnr, const char *name,
429 struct module *owner, const char *mod_name)
430{
431 int result;
432 struct pci_slot *pci_slot;
433
434 if (slot == NULL)
435 return -ENODEV;
436 if ((slot->info == NULL) || (slot->ops == NULL))
437 return -EINVAL;
438 if (slot->release == NULL) {
439 dbg("Why are you trying to register a hotplug slot "
440 "without a proper release function?\n");
441 return -EINVAL;
442 }
443
444 slot->ops->owner = owner;
445 slot->ops->mod_name = mod_name;
446
447 mutex_lock(&pci_hp_mutex);
448
449
450
451
452
453 pci_slot = pci_create_slot(bus, devnr, name, slot);
454 if (IS_ERR(pci_slot)) {
455 result = PTR_ERR(pci_slot);
456 goto out;
457 }
458
459 slot->pci_slot = pci_slot;
460 pci_slot->hotplug = slot;
461
462 list_add(&slot->slot_list, &pci_hotplug_slot_list);
463
464 result = fs_add_slot(pci_slot);
465 kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
466 dbg("Added slot %s to the list\n", name);
467out:
468 mutex_unlock(&pci_hp_mutex);
469 return result;
470}
471
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479
480
481int pci_hp_deregister(struct hotplug_slot *hotplug)
482{
483 struct hotplug_slot *temp;
484 struct pci_slot *slot;
485
486 if (!hotplug)
487 return -ENODEV;
488
489 mutex_lock(&pci_hp_mutex);
490 temp = get_slot_from_name(hotplug_slot_name(hotplug));
491 if (temp != hotplug) {
492 mutex_unlock(&pci_hp_mutex);
493 return -ENODEV;
494 }
495
496 list_del(&hotplug->slot_list);
497
498 slot = hotplug->pci_slot;
499 fs_remove_slot(slot);
500 dbg("Removed slot %s from the list\n", hotplug_slot_name(hotplug));
501
502 hotplug->release(hotplug);
503 slot->hotplug = NULL;
504 pci_destroy_slot(slot);
505 mutex_unlock(&pci_hp_mutex);
506
507 return 0;
508}
509
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518
519
520int pci_hp_change_slot_info(struct hotplug_slot *hotplug,
521 struct hotplug_slot_info *info)
522{
523 if (!hotplug || !info)
524 return -ENODEV;
525
526 memcpy(hotplug->info, info, sizeof(struct hotplug_slot_info));
527
528 return 0;
529}
530
531static int __init pci_hotplug_init (void)
532{
533 int result;
534
535 result = cpci_hotplug_init(debug);
536 if (result) {
537 err ("cpci_hotplug_init with error %d\n", result);
538 goto err_cpci;
539 }
540
541 info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
542
543err_cpci:
544 return result;
545}
546
547static void __exit pci_hotplug_exit (void)
548{
549 cpci_hotplug_exit();
550}
551
552module_init(pci_hotplug_init);
553module_exit(pci_hotplug_exit);
554
555MODULE_AUTHOR(DRIVER_AUTHOR);
556MODULE_DESCRIPTION(DRIVER_DESC);
557MODULE_LICENSE("GPL");
558module_param(debug, bool, 0644);
559MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
560
561EXPORT_SYMBOL_GPL(__pci_hp_register);
562EXPORT_SYMBOL_GPL(pci_hp_deregister);
563EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
564
