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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI HotPlug Controller Core
4 *
5 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001-2002 IBM Corp.
7 *
8 * All rights reserved.
9 *
10 * Send feedback to <kristen.c.accardi@intel.com>
11 *
12 * Authors:
13 * Greg Kroah-Hartman <greg@kroah.com>
14 * Scott Murray <scottm@somanetworks.com>
15 */
16
17#include <linux/module.h> /* try_module_get & module_put */
18#include <linux/moduleparam.h>
19#include <linux/kernel.h>
20#include <linux/types.h>
21#include <linux/list.h>
22#include <linux/kobject.h>
23#include <linux/sysfs.h>
24#include <linux/pagemap.h>
25#include <linux/init.h>
26#include <linux/mount.h>
27#include <linux/namei.h>
28#include <linux/mutex.h>
29#include <linux/pci.h>
30#include <linux/pci_hotplug.h>
31#include <linux/uaccess.h>
32#include "../pci.h"
33#include "cpci_hotplug.h"
34
35#define MY_NAME "pci_hotplug"
36
37#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt, MY_NAME, __func__, ## arg); } while (0)
38#define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME, ## arg)
39#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME, ## arg)
40#define warn(format, arg...) printk(KERN_WARNING "%s: " format, MY_NAME, ## arg)
41
42/* local variables */
43static bool debug;
44
45static LIST_HEAD(pci_hotplug_slot_list);
46static DEFINE_MUTEX(pci_hp_mutex);
47
48/* Weee, fun with macros... */
49#define GET_STATUS(name, type) \
50static int get_##name(struct hotplug_slot *slot, type *value) \
51{ \
52 const struct hotplug_slot_ops *ops = slot->ops; \
53 int retval = 0; \
54 if (!try_module_get(slot->owner)) \
55 return -ENODEV; \
56 if (ops->get_##name) \
57 retval = ops->get_##name(slot, value); \
58 module_put(slot->owner); \
59 return retval; \
60}
61
62GET_STATUS(power_status, u8)
63GET_STATUS(attention_status, u8)
64GET_STATUS(latch_status, u8)
65GET_STATUS(adapter_status, u8)
66
67static ssize_t power_read_file(struct pci_slot *pci_slot, char *buf)
68{
69 int retval;
70 u8 value;
71
72 retval = get_power_status(pci_slot->hotplug, &value);
73 if (retval)
74 return retval;
75
76 return sysfs_emit(buf, "%d\n", value);
77}
78
79static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
80 size_t count)
81{
82 struct hotplug_slot *slot = pci_slot->hotplug;
83 unsigned long lpower;
84 u8 power;
85 int retval = 0;
86
87 lpower = simple_strtoul(buf, NULL, 10);
88 power = (u8)(lpower & 0xff);
89 dbg("power = %d\n", power);
90
91 if (!try_module_get(slot->owner)) {
92 retval = -ENODEV;
93 goto exit;
94 }
95 switch (power) {
96 case 0:
97 if (slot->ops->disable_slot)
98 retval = slot->ops->disable_slot(slot);
99 break;
100
101 case 1:
102 if (slot->ops->enable_slot)
103 retval = slot->ops->enable_slot(slot);
104 break;
105
106 default:
107 err("Illegal value specified for power\n");
108 retval = -EINVAL;
109 }
110 module_put(slot->owner);
111
112exit:
113 if (retval)
114 return retval;
115 return count;
116}
117
118static struct pci_slot_attribute hotplug_slot_attr_power = {
119 .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
120 .show = power_read_file,
121 .store = power_write_file
122};
123
124static ssize_t attention_read_file(struct pci_slot *pci_slot, char *buf)
125{
126 int retval;
127 u8 value;
128
129 retval = get_attention_status(pci_slot->hotplug, &value);
130 if (retval)
131 return retval;
132
133 return sysfs_emit(buf, "%d\n", value);
134}
135
136static ssize_t attention_write_file(struct pci_slot *pci_slot, const char *buf,
137 size_t count)
138{
139 struct hotplug_slot *slot = pci_slot->hotplug;
140 const struct hotplug_slot_ops *ops = slot->ops;
141 unsigned long lattention;
142 u8 attention;
143 int retval = 0;
144
145 lattention = simple_strtoul(buf, NULL, 10);
146 attention = (u8)(lattention & 0xff);
147 dbg(" - attention = %d\n", attention);
148
149 if (!try_module_get(slot->owner)) {
150 retval = -ENODEV;
151 goto exit;
152 }
153 if (ops->set_attention_status)
154 retval = ops->set_attention_status(slot, attention);
155 module_put(slot->owner);
156
157exit:
158 if (retval)
159 return retval;
160 return count;
161}
162
163static struct pci_slot_attribute hotplug_slot_attr_attention = {
164 .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
165 .show = attention_read_file,
166 .store = attention_write_file
167};
168
169static ssize_t latch_read_file(struct pci_slot *pci_slot, char *buf)
170{
171 int retval;
172 u8 value;
173
174 retval = get_latch_status(pci_slot->hotplug, &value);
175 if (retval)
176 return retval;
177
178 return sysfs_emit(buf, "%d\n", value);
179}
180
181static struct pci_slot_attribute hotplug_slot_attr_latch = {
182 .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
183 .show = latch_read_file,
184};
185
186static ssize_t presence_read_file(struct pci_slot *pci_slot, char *buf)
187{
188 int retval;
189 u8 value;
190
191 retval = get_adapter_status(pci_slot->hotplug, &value);
192 if (retval)
193 return retval;
194
195 return sysfs_emit(buf, "%d\n", value);
196}
197
198static struct pci_slot_attribute hotplug_slot_attr_presence = {
199 .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
200 .show = presence_read_file,
201};
202
203static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
204 size_t count)
205{
206 struct hotplug_slot *slot = pci_slot->hotplug;
207 unsigned long ltest;
208 u32 test;
209 int retval = 0;
210
211 ltest = simple_strtoul(buf, NULL, 10);
212 test = (u32)(ltest & 0xffffffff);
213 dbg("test = %d\n", test);
214
215 if (!try_module_get(slot->owner)) {
216 retval = -ENODEV;
217 goto exit;
218 }
219 if (slot->ops->hardware_test)
220 retval = slot->ops->hardware_test(slot, test);
221 module_put(slot->owner);
222
223exit:
224 if (retval)
225 return retval;
226 return count;
227}
228
229static struct pci_slot_attribute hotplug_slot_attr_test = {
230 .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
231 .store = test_write_file
232};
233
234static bool has_power_file(struct pci_slot *pci_slot)
235{
236 struct hotplug_slot *slot = pci_slot->hotplug;
237
238 if ((!slot) || (!slot->ops))
239 return false;
240 if ((slot->ops->enable_slot) ||
241 (slot->ops->disable_slot) ||
242 (slot->ops->get_power_status))
243 return true;
244 return false;
245}
246
247static bool has_attention_file(struct pci_slot *pci_slot)
248{
249 struct hotplug_slot *slot = pci_slot->hotplug;
250
251 if ((!slot) || (!slot->ops))
252 return false;
253 if ((slot->ops->set_attention_status) ||
254 (slot->ops->get_attention_status))
255 return true;
256 return false;
257}
258
259static bool has_latch_file(struct pci_slot *pci_slot)
260{
261 struct hotplug_slot *slot = pci_slot->hotplug;
262
263 if ((!slot) || (!slot->ops))
264 return false;
265 if (slot->ops->get_latch_status)
266 return true;
267 return false;
268}
269
270static bool has_adapter_file(struct pci_slot *pci_slot)
271{
272 struct hotplug_slot *slot = pci_slot->hotplug;
273
274 if ((!slot) || (!slot->ops))
275 return false;
276 if (slot->ops->get_adapter_status)
277 return true;
278 return false;
279}
280
281static bool has_test_file(struct pci_slot *pci_slot)
282{
283 struct hotplug_slot *slot = pci_slot->hotplug;
284
285 if ((!slot) || (!slot->ops))
286 return false;
287 if (slot->ops->hardware_test)
288 return true;
289 return false;
290}
291
292static int fs_add_slot(struct pci_slot *pci_slot)
293{
294 int retval = 0;
295
296 /* Create symbolic link to the hotplug driver module */
297 pci_hp_create_module_link(pci_slot);
298
299 if (has_power_file(pci_slot)) {
300 retval = sysfs_create_file(&pci_slot->kobj,
301 &hotplug_slot_attr_power.attr);
302 if (retval)
303 goto exit_power;
304 }
305
306 if (has_attention_file(pci_slot)) {
307 retval = sysfs_create_file(&pci_slot->kobj,
308 &hotplug_slot_attr_attention.attr);
309 if (retval)
310 goto exit_attention;
311 }
312
313 if (has_latch_file(pci_slot)) {
314 retval = sysfs_create_file(&pci_slot->kobj,
315 &hotplug_slot_attr_latch.attr);
316 if (retval)
317 goto exit_latch;
318 }
319
320 if (has_adapter_file(pci_slot)) {
321 retval = sysfs_create_file(&pci_slot->kobj,
322 &hotplug_slot_attr_presence.attr);
323 if (retval)
324 goto exit_adapter;
325 }
326
327 if (has_test_file(pci_slot)) {
328 retval = sysfs_create_file(&pci_slot->kobj,
329 &hotplug_slot_attr_test.attr);
330 if (retval)
331 goto exit_test;
332 }
333
334 goto exit;
335
336exit_test:
337 if (has_adapter_file(pci_slot))
338 sysfs_remove_file(&pci_slot->kobj,
339 &hotplug_slot_attr_presence.attr);
340exit_adapter:
341 if (has_latch_file(pci_slot))
342 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
343exit_latch:
344 if (has_attention_file(pci_slot))
345 sysfs_remove_file(&pci_slot->kobj,
346 &hotplug_slot_attr_attention.attr);
347exit_attention:
348 if (has_power_file(pci_slot))
349 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
350exit_power:
351 pci_hp_remove_module_link(pci_slot);
352exit:
353 return retval;
354}
355
356static void fs_remove_slot(struct pci_slot *pci_slot)
357{
358 if (has_power_file(pci_slot))
359 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
360
361 if (has_attention_file(pci_slot))
362 sysfs_remove_file(&pci_slot->kobj,
363 &hotplug_slot_attr_attention.attr);
364
365 if (has_latch_file(pci_slot))
366 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
367
368 if (has_adapter_file(pci_slot))
369 sysfs_remove_file(&pci_slot->kobj,
370 &hotplug_slot_attr_presence.attr);
371
372 if (has_test_file(pci_slot))
373 sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_test.attr);
374
375 pci_hp_remove_module_link(pci_slot);
376}
377
378static struct hotplug_slot *get_slot_from_name(const char *name)
379{
380 struct hotplug_slot *slot;
381
382 list_for_each_entry(slot, &pci_hotplug_slot_list, slot_list) {
383 if (strcmp(hotplug_slot_name(slot), name) == 0)
384 return slot;
385 }
386 return NULL;
387}
388
389/**
390 * __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
391 * @bus: bus this slot is on
392 * @slot: pointer to the &struct hotplug_slot to register
393 * @devnr: device number
394 * @name: name registered with kobject core
395 * @owner: caller module owner
396 * @mod_name: caller module name
397 *
398 * Prepares a hotplug slot for in-kernel use and immediately publishes it to
399 * user space in one go. Drivers may alternatively carry out the two steps
400 * separately by invoking pci_hp_initialize() and pci_hp_add().
401 *
402 * Returns 0 if successful, anything else for an error.
403 */
404int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
405 int devnr, const char *name,
406 struct module *owner, const char *mod_name)
407{
408 int result;
409
410 result = __pci_hp_initialize(slot, bus, devnr, name, owner, mod_name);
411 if (result)
412 return result;
413
414 result = pci_hp_add(slot);
415 if (result)
416 pci_hp_destroy(slot);
417
418 return result;
419}
420EXPORT_SYMBOL_GPL(__pci_hp_register);
421
422/**
423 * __pci_hp_initialize - prepare hotplug slot for in-kernel use
424 * @slot: pointer to the &struct hotplug_slot to initialize
425 * @bus: bus this slot is on
426 * @devnr: slot number
427 * @name: name registered with kobject core
428 * @owner: caller module owner
429 * @mod_name: caller module name
430 *
431 * Allocate and fill in a PCI slot for use by a hotplug driver. Once this has
432 * been called, the driver may invoke hotplug_slot_name() to get the slot's
433 * unique name. The driver must be prepared to handle a ->reset_slot callback
434 * from this point on.
435 *
436 * Returns 0 on success or a negative int on error.
437 */
438int __pci_hp_initialize(struct hotplug_slot *slot, struct pci_bus *bus,
439 int devnr, const char *name, struct module *owner,
440 const char *mod_name)
441{
442 struct pci_slot *pci_slot;
443
444 if (slot == NULL)
445 return -ENODEV;
446 if (slot->ops == NULL)
447 return -EINVAL;
448
449 slot->owner = owner;
450 slot->mod_name = mod_name;
451
452 /*
453 * No problems if we call this interface from both ACPI_PCI_SLOT
454 * driver and call it here again. If we've already created the
455 * pci_slot, the interface will simply bump the refcount.
456 */
457 pci_slot = pci_create_slot(bus, devnr, name, slot);
458 if (IS_ERR(pci_slot))
459 return PTR_ERR(pci_slot);
460
461 slot->pci_slot = pci_slot;
462 pci_slot->hotplug = slot;
463 return 0;
464}
465EXPORT_SYMBOL_GPL(__pci_hp_initialize);
466
467/**
468 * pci_hp_add - publish hotplug slot to user space
469 * @slot: pointer to the &struct hotplug_slot to publish
470 *
471 * Make a hotplug slot's sysfs interface available and inform user space of its
472 * addition by sending a uevent. The hotplug driver must be prepared to handle
473 * all &struct hotplug_slot_ops callbacks from this point on.
474 *
475 * Returns 0 on success or a negative int on error.
476 */
477int pci_hp_add(struct hotplug_slot *slot)
478{
479 struct pci_slot *pci_slot = slot->pci_slot;
480 int result;
481
482 result = fs_add_slot(pci_slot);
483 if (result)
484 return result;
485
486 kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
487 mutex_lock(&pci_hp_mutex);
488 list_add(&slot->slot_list, &pci_hotplug_slot_list);
489 mutex_unlock(&pci_hp_mutex);
490 dbg("Added slot %s to the list\n", hotplug_slot_name(slot));
491 return 0;
492}
493EXPORT_SYMBOL_GPL(pci_hp_add);
494
495/**
496 * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
497 * @slot: pointer to the &struct hotplug_slot to deregister
498 *
499 * The @slot must have been registered with the pci hotplug subsystem
500 * previously with a call to pci_hp_register().
501 *
502 * Returns 0 if successful, anything else for an error.
503 */
504void pci_hp_deregister(struct hotplug_slot *slot)
505{
506 pci_hp_del(slot);
507 pci_hp_destroy(slot);
508}
509EXPORT_SYMBOL_GPL(pci_hp_deregister);
510
511/**
512 * pci_hp_del - unpublish hotplug slot from user space
513 * @slot: pointer to the &struct hotplug_slot to unpublish
514 *
515 * Remove a hotplug slot's sysfs interface.
516 *
517 * Returns 0 on success or a negative int on error.
518 */
519void pci_hp_del(struct hotplug_slot *slot)
520{
521 struct hotplug_slot *temp;
522
523 if (WARN_ON(!slot))
524 return;
525
526 mutex_lock(&pci_hp_mutex);
527 temp = get_slot_from_name(hotplug_slot_name(slot));
528 if (WARN_ON(temp != slot)) {
529 mutex_unlock(&pci_hp_mutex);
530 return;
531 }
532
533 list_del(&slot->slot_list);
534 mutex_unlock(&pci_hp_mutex);
535 dbg("Removed slot %s from the list\n", hotplug_slot_name(slot));
536 fs_remove_slot(slot->pci_slot);
537}
538EXPORT_SYMBOL_GPL(pci_hp_del);
539
540/**
541 * pci_hp_destroy - remove hotplug slot from in-kernel use
542 * @slot: pointer to the &struct hotplug_slot to destroy
543 *
544 * Destroy a PCI slot used by a hotplug driver. Once this has been called,
545 * the driver may no longer invoke hotplug_slot_name() to get the slot's
546 * unique name. The driver no longer needs to handle a ->reset_slot callback
547 * from this point on.
548 *
549 * Returns 0 on success or a negative int on error.
550 */
551void pci_hp_destroy(struct hotplug_slot *slot)
552{
553 struct pci_slot *pci_slot = slot->pci_slot;
554
555 slot->pci_slot = NULL;
556 pci_slot->hotplug = NULL;
557 pci_destroy_slot(pci_slot);
558}
559EXPORT_SYMBOL_GPL(pci_hp_destroy);
560
561static int __init pci_hotplug_init(void)
562{
563 int result;
564
565 result = cpci_hotplug_init(debug);
566 if (result) {
567 err("cpci_hotplug_init with error %d\n", result);
568 return result;
569 }
570
571 return result;
572}
573device_initcall(pci_hotplug_init);
574
575/*
576 * not really modular, but the easiest way to keep compat with existing
577 * bootargs behaviour is to continue using module_param here.
578 */
579module_param(debug, bool, 0644);
580MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
1/*
2 * PCI HotPlug Controller Core
3 *
4 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2001-2002 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 <kristen.c.accardi@intel.com>
25 *
26 */
27
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
45#define MY_NAME "pci_hotplug"
46
47#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
48#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
49#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
50#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
51
52
53/* local variables */
54static int debug;
55
56#define DRIVER_VERSION "0.5"
57#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
58#define DRIVER_DESC "PCI Hot Plug PCI Core"
59
60
61//////////////////////////////////////////////////////////////////
62
63static LIST_HEAD(pci_hotplug_slot_list);
64static DEFINE_MUTEX(pci_hp_mutex);
65
66#ifdef CONFIG_HOTPLUG_PCI_CPCI
67extern int cpci_hotplug_init(int debug);
68extern void cpci_hotplug_exit(void);
69#else
70static inline int cpci_hotplug_init(int debug) { return 0; }
71static inline void cpci_hotplug_exit(void) { }
72#endif
73
74/* Weee, fun with macros... */
75#define GET_STATUS(name,type) \
76static int get_##name (struct hotplug_slot *slot, type *value) \
77{ \
78 struct hotplug_slot_ops *ops = slot->ops; \
79 int retval = 0; \
80 if (!try_module_get(ops->owner)) \
81 return -ENODEV; \
82 if (ops->get_##name) \
83 retval = ops->get_##name(slot, value); \
84 else \
85 *value = slot->info->name; \
86 module_put(ops->owner); \
87 return retval; \
88}
89
90GET_STATUS(power_status, u8)
91GET_STATUS(attention_status, u8)
92GET_STATUS(latch_status, u8)
93GET_STATUS(adapter_status, u8)
94
95static ssize_t power_read_file(struct pci_slot *slot, char *buf)
96{
97 int retval;
98 u8 value;
99
100 retval = get_power_status(slot->hotplug, &value);
101 if (retval)
102 goto exit;
103 retval = sprintf (buf, "%d\n", value);
104exit:
105 return retval;
106}
107
108static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
109 size_t count)
110{
111 struct hotplug_slot *slot = pci_slot->hotplug;
112 unsigned long lpower;
113 u8 power;
114 int retval = 0;
115
116 lpower = simple_strtoul (buf, NULL, 10);
117 power = (u8)(lpower & 0xff);
118 dbg ("power = %d\n", power);
119
120 if (!try_module_get(slot->ops->owner)) {
121 retval = -ENODEV;
122 goto exit;
123 }
124 switch (power) {
125 case 0:
126 if (slot->ops->disable_slot)
127 retval = slot->ops->disable_slot(slot);
128 break;
129
130 case 1:
131 if (slot->ops->enable_slot)
132 retval = slot->ops->enable_slot(slot);
133 break;
134
135 default:
136 err ("Illegal value specified for power\n");
137 retval = -EINVAL;
138 }
139 module_put(slot->ops->owner);
140
141exit:
142 if (retval)
143 return retval;
144 return count;
145}
146
147static struct pci_slot_attribute hotplug_slot_attr_power = {
148 .attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
149 .show = power_read_file,
150 .store = power_write_file
151};
152
153static ssize_t attention_read_file(struct pci_slot *slot, char *buf)
154{
155 int retval;
156 u8 value;
157
158 retval = get_attention_status(slot->hotplug, &value);
159 if (retval)
160 goto exit;
161 retval = sprintf(buf, "%d\n", value);
162
163exit:
164 return retval;
165}
166
167static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
168 size_t count)
169{
170 struct hotplug_slot_ops *ops = slot->hotplug->ops;
171 unsigned long lattention;
172 u8 attention;
173 int retval = 0;
174
175 lattention = simple_strtoul (buf, NULL, 10);
176 attention = (u8)(lattention & 0xff);
177 dbg (" - attention = %d\n", attention);
178
179 if (!try_module_get(ops->owner)) {
180 retval = -ENODEV;
181 goto exit;
182 }
183 if (ops->set_attention_status)
184 retval = ops->set_attention_status(slot->hotplug, attention);
185 module_put(ops->owner);
186
187exit:
188 if (retval)
189 return retval;
190 return count;
191}
192
193static struct pci_slot_attribute hotplug_slot_attr_attention = {
194 .attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
195 .show = attention_read_file,
196 .store = attention_write_file
197};
198
199static ssize_t latch_read_file(struct pci_slot *slot, char *buf)
200{
201 int retval;
202 u8 value;
203
204 retval = get_latch_status(slot->hotplug, &value);
205 if (retval)
206 goto exit;
207 retval = sprintf (buf, "%d\n", value);
208
209exit:
210 return retval;
211}
212
213static struct pci_slot_attribute hotplug_slot_attr_latch = {
214 .attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
215 .show = latch_read_file,
216};
217
218static ssize_t presence_read_file(struct pci_slot *slot, char *buf)
219{
220 int retval;
221 u8 value;
222
223 retval = get_adapter_status(slot->hotplug, &value);
224 if (retval)
225 goto exit;
226 retval = sprintf (buf, "%d\n", value);
227
228exit:
229 return retval;
230}
231
232static struct pci_slot_attribute hotplug_slot_attr_presence = {
233 .attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
234 .show = presence_read_file,
235};
236
237static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
238 size_t count)
239{
240 struct hotplug_slot *slot = pci_slot->hotplug;
241 unsigned long ltest;
242 u32 test;
243 int retval = 0;
244
245 ltest = simple_strtoul (buf, NULL, 10);
246 test = (u32)(ltest & 0xffffffff);
247 dbg ("test = %d\n", test);
248
249 if (!try_module_get(slot->ops->owner)) {
250 retval = -ENODEV;
251 goto exit;
252 }
253 if (slot->ops->hardware_test)
254 retval = slot->ops->hardware_test(slot, test);
255 module_put(slot->ops->owner);
256
257exit:
258 if (retval)
259 return retval;
260 return count;
261}
262
263static struct pci_slot_attribute hotplug_slot_attr_test = {
264 .attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
265 .store = test_write_file
266};
267
268static bool has_power_file(struct pci_slot *pci_slot)
269{
270 struct hotplug_slot *slot = pci_slot->hotplug;
271 if ((!slot) || (!slot->ops))
272 return false;
273 if ((slot->ops->enable_slot) ||
274 (slot->ops->disable_slot) ||
275 (slot->ops->get_power_status))
276 return true;
277 return false;
278}
279
280static bool has_attention_file(struct pci_slot *pci_slot)
281{
282 struct hotplug_slot *slot = pci_slot->hotplug;
283 if ((!slot) || (!slot->ops))
284 return false;
285 if ((slot->ops->set_attention_status) ||
286 (slot->ops->get_attention_status))
287 return true;
288 return false;
289}
290
291static bool has_latch_file(struct pci_slot *pci_slot)
292{
293 struct hotplug_slot *slot = pci_slot->hotplug;
294 if ((!slot) || (!slot->ops))
295 return false;
296 if (slot->ops->get_latch_status)
297 return true;
298 return false;
299}
300
301static bool has_adapter_file(struct pci_slot *pci_slot)
302{
303 struct hotplug_slot *slot = pci_slot->hotplug;
304 if ((!slot) || (!slot->ops))
305 return false;
306 if (slot->ops->get_adapter_status)
307 return true;
308 return false;
309}
310
311static bool has_test_file(struct pci_slot *pci_slot)
312{
313 struct hotplug_slot *slot = pci_slot->hotplug;
314 if ((!slot) || (!slot->ops))
315 return false;
316 if (slot->ops->hardware_test)
317 return true;
318 return false;
319}
320
321static int fs_add_slot(struct pci_slot *slot)
322{
323 int retval = 0;
324
325 /* Create symbolic link to the hotplug driver module */
326 pci_hp_create_module_link(slot);
327
328 if (has_power_file(slot)) {
329 retval = sysfs_create_file(&slot->kobj,
330 &hotplug_slot_attr_power.attr);
331 if (retval)
332 goto exit_power;
333 }
334
335 if (has_attention_file(slot)) {
336 retval = sysfs_create_file(&slot->kobj,
337 &hotplug_slot_attr_attention.attr);
338 if (retval)
339 goto exit_attention;
340 }
341
342 if (has_latch_file(slot)) {
343 retval = sysfs_create_file(&slot->kobj,
344 &hotplug_slot_attr_latch.attr);
345 if (retval)
346 goto exit_latch;
347 }
348
349 if (has_adapter_file(slot)) {
350 retval = sysfs_create_file(&slot->kobj,
351 &hotplug_slot_attr_presence.attr);
352 if (retval)
353 goto exit_adapter;
354 }
355
356 if (has_test_file(slot)) {
357 retval = sysfs_create_file(&slot->kobj,
358 &hotplug_slot_attr_test.attr);
359 if (retval)
360 goto exit_test;
361 }
362
363 goto exit;
364
365exit_test:
366 if (has_adapter_file(slot))
367 sysfs_remove_file(&slot->kobj,
368 &hotplug_slot_attr_presence.attr);
369exit_adapter:
370 if (has_latch_file(slot))
371 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
372exit_latch:
373 if (has_attention_file(slot))
374 sysfs_remove_file(&slot->kobj,
375 &hotplug_slot_attr_attention.attr);
376exit_attention:
377 if (has_power_file(slot))
378 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
379exit_power:
380 pci_hp_remove_module_link(slot);
381exit:
382 return retval;
383}
384
385static void fs_remove_slot(struct pci_slot *slot)
386{
387 if (has_power_file(slot))
388 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
389
390 if (has_attention_file(slot))
391 sysfs_remove_file(&slot->kobj,
392 &hotplug_slot_attr_attention.attr);
393
394 if (has_latch_file(slot))
395 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
396
397 if (has_adapter_file(slot))
398 sysfs_remove_file(&slot->kobj,
399 &hotplug_slot_attr_presence.attr);
400
401 if (has_test_file(slot))
402 sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
403
404 pci_hp_remove_module_link(slot);
405}
406
407static struct hotplug_slot *get_slot_from_name (const char *name)
408{
409 struct hotplug_slot *slot;
410 struct list_head *tmp;
411
412 list_for_each (tmp, &pci_hotplug_slot_list) {
413 slot = list_entry (tmp, struct hotplug_slot, slot_list);
414 if (strcmp(hotplug_slot_name(slot), name) == 0)
415 return slot;
416 }
417 return NULL;
418}
419
420/**
421 * __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
422 * @bus: bus this slot is on
423 * @slot: pointer to the &struct hotplug_slot to register
424 * @devnr: device number
425 * @name: name registered with kobject core
426 * @owner: caller module owner
427 * @mod_name: caller module name
428 *
429 * Registers a hotplug slot with the pci hotplug subsystem, which will allow
430 * userspace interaction to the slot.
431 *
432 * Returns 0 if successful, anything else for an error.
433 */
434int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
435 int devnr, const char *name,
436 struct module *owner, const char *mod_name)
437{
438 int result;
439 struct pci_slot *pci_slot;
440
441 if (slot == NULL)
442 return -ENODEV;
443 if ((slot->info == NULL) || (slot->ops == NULL))
444 return -EINVAL;
445 if (slot->release == NULL) {
446 dbg("Why are you trying to register a hotplug slot "
447 "without a proper release function?\n");
448 return -EINVAL;
449 }
450
451 slot->ops->owner = owner;
452 slot->ops->mod_name = mod_name;
453
454 mutex_lock(&pci_hp_mutex);
455 /*
456 * No problems if we call this interface from both ACPI_PCI_SLOT
457 * driver and call it here again. If we've already created the
458 * pci_slot, the interface will simply bump the refcount.
459 */
460 pci_slot = pci_create_slot(bus, devnr, name, slot);
461 if (IS_ERR(pci_slot)) {
462 result = PTR_ERR(pci_slot);
463 goto out;
464 }
465
466 slot->pci_slot = pci_slot;
467 pci_slot->hotplug = slot;
468
469 list_add(&slot->slot_list, &pci_hotplug_slot_list);
470
471 result = fs_add_slot(pci_slot);
472 kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
473 dbg("Added slot %s to the list\n", name);
474out:
475 mutex_unlock(&pci_hp_mutex);
476 return result;
477}
478
479/**
480 * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
481 * @hotplug: pointer to the &struct hotplug_slot to deregister
482 *
483 * The @slot must have been registered with the pci hotplug subsystem
484 * previously with a call to pci_hp_register().
485 *
486 * Returns 0 if successful, anything else for an error.
487 */
488int pci_hp_deregister(struct hotplug_slot *hotplug)
489{
490 struct hotplug_slot *temp;
491 struct pci_slot *slot;
492
493 if (!hotplug)
494 return -ENODEV;
495
496 mutex_lock(&pci_hp_mutex);
497 temp = get_slot_from_name(hotplug_slot_name(hotplug));
498 if (temp != hotplug) {
499 mutex_unlock(&pci_hp_mutex);
500 return -ENODEV;
501 }
502
503 list_del(&hotplug->slot_list);
504
505 slot = hotplug->pci_slot;
506 fs_remove_slot(slot);
507 dbg("Removed slot %s from the list\n", hotplug_slot_name(hotplug));
508
509 hotplug->release(hotplug);
510 slot->hotplug = NULL;
511 pci_destroy_slot(slot);
512 mutex_unlock(&pci_hp_mutex);
513
514 return 0;
515}
516
517/**
518 * pci_hp_change_slot_info - changes the slot's information structure in the core
519 * @hotplug: pointer to the slot whose info has changed
520 * @info: pointer to the info copy into the slot's info structure
521 *
522 * @slot must have been registered with the pci
523 * hotplug subsystem previously with a call to pci_hp_register().
524 *
525 * Returns 0 if successful, anything else for an error.
526 */
527int __must_check pci_hp_change_slot_info(struct hotplug_slot *hotplug,
528 struct hotplug_slot_info *info)
529{
530 struct pci_slot *slot;
531 if (!hotplug || !info)
532 return -ENODEV;
533 slot = hotplug->pci_slot;
534
535 memcpy(hotplug->info, info, sizeof(struct hotplug_slot_info));
536
537 return 0;
538}
539
540static int __init pci_hotplug_init (void)
541{
542 int result;
543
544 result = cpci_hotplug_init(debug);
545 if (result) {
546 err ("cpci_hotplug_init with error %d\n", result);
547 goto err_cpci;
548 }
549
550 info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
551
552err_cpci:
553 return result;
554}
555
556static void __exit pci_hotplug_exit (void)
557{
558 cpci_hotplug_exit();
559}
560
561module_init(pci_hotplug_init);
562module_exit(pci_hotplug_exit);
563
564MODULE_AUTHOR(DRIVER_AUTHOR);
565MODULE_DESCRIPTION(DRIVER_DESC);
566MODULE_LICENSE("GPL");
567module_param(debug, bool, 0644);
568MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
569
570EXPORT_SYMBOL_GPL(__pci_hp_register);
571EXPORT_SYMBOL_GPL(pci_hp_deregister);
572EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);