1 /*
2 * Standard Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/types.h>
33 #include <linux/slab.h>
34 #include <linux/pci.h>
35 #include "../pci.h"
36 #include "shpchp.h"
37
38 static void interrupt_event_handler(struct work_struct *work);
39 static int shpchp_enable_slot(struct slot *p_slot);
40 static int shpchp_disable_slot(struct slot *p_slot);
41
queue_interrupt_event(struct slot * p_slot,u32 event_type)42 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
43 {
44 struct event_info *info;
45
46 info = kmalloc(sizeof(*info), GFP_ATOMIC);
47 if (!info)
48 return -ENOMEM;
49
50 info->event_type = event_type;
51 info->p_slot = p_slot;
52 INIT_WORK(&info->work, interrupt_event_handler);
53
54 queue_work(p_slot->wq, &info->work);
55
56 return 0;
57 }
58
shpchp_handle_attention_button(u8 hp_slot,struct controller * ctrl)59 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
60 {
61 struct slot *p_slot;
62 u32 event_type;
63
64 /* Attention Button Change */
65 ctrl_dbg(ctrl, "Attention button interrupt received\n");
66
67 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
68 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
69
70 /*
71 * Button pressed - See if need to TAKE ACTION!!!
72 */
73 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
74 event_type = INT_BUTTON_PRESS;
75
76 queue_interrupt_event(p_slot, event_type);
77
78 return 0;
79
80 }
81
shpchp_handle_switch_change(u8 hp_slot,struct controller * ctrl)82 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
83 {
84 struct slot *p_slot;
85 u8 getstatus;
86 u32 event_type;
87
88 /* Switch Change */
89 ctrl_dbg(ctrl, "Switch interrupt received\n");
90
91 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
92 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
93 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
94 ctrl_dbg(ctrl, "Card present %x Power status %x\n",
95 p_slot->presence_save, p_slot->pwr_save);
96
97 if (getstatus) {
98 /*
99 * Switch opened
100 */
101 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
102 event_type = INT_SWITCH_OPEN;
103 if (p_slot->pwr_save && p_slot->presence_save) {
104 event_type = INT_POWER_FAULT;
105 ctrl_err(ctrl, "Surprise Removal of card\n");
106 }
107 } else {
108 /*
109 * Switch closed
110 */
111 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
112 event_type = INT_SWITCH_CLOSE;
113 }
114
115 queue_interrupt_event(p_slot, event_type);
116
117 return 1;
118 }
119
shpchp_handle_presence_change(u8 hp_slot,struct controller * ctrl)120 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
121 {
122 struct slot *p_slot;
123 u32 event_type;
124
125 /* Presence Change */
126 ctrl_dbg(ctrl, "Presence/Notify input change\n");
127
128 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
129
130 /*
131 * Save the presence state
132 */
133 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
134 if (p_slot->presence_save) {
135 /*
136 * Card Present
137 */
138 ctrl_info(ctrl, "Card present on Slot(%s)\n",
139 slot_name(p_slot));
140 event_type = INT_PRESENCE_ON;
141 } else {
142 /*
143 * Not Present
144 */
145 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
146 slot_name(p_slot));
147 event_type = INT_PRESENCE_OFF;
148 }
149
150 queue_interrupt_event(p_slot, event_type);
151
152 return 1;
153 }
154
shpchp_handle_power_fault(u8 hp_slot,struct controller * ctrl)155 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
156 {
157 struct slot *p_slot;
158 u32 event_type;
159
160 /* Power fault */
161 ctrl_dbg(ctrl, "Power fault interrupt received\n");
162
163 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
164
165 if (!(p_slot->hpc_ops->query_power_fault(p_slot))) {
166 /*
167 * Power fault Cleared
168 */
169 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
170 slot_name(p_slot));
171 p_slot->status = 0x00;
172 event_type = INT_POWER_FAULT_CLEAR;
173 } else {
174 /*
175 * Power fault
176 */
177 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
178 event_type = INT_POWER_FAULT;
179 /* set power fault status for this board */
180 p_slot->status = 0xFF;
181 ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
182 }
183
184 queue_interrupt_event(p_slot, event_type);
185
186 return 1;
187 }
188
189 /* The following routines constitute the bulk of the
190 hotplug controller logic
191 */
change_bus_speed(struct controller * ctrl,struct slot * p_slot,enum pci_bus_speed speed)192 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
193 enum pci_bus_speed speed)
194 {
195 int rc = 0;
196
197 ctrl_dbg(ctrl, "Change speed to %d\n", speed);
198 rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed);
199 if (rc) {
200 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
201 __func__);
202 return WRONG_BUS_FREQUENCY;
203 }
204 return rc;
205 }
206
fix_bus_speed(struct controller * ctrl,struct slot * pslot,u8 flag,enum pci_bus_speed asp,enum pci_bus_speed bsp,enum pci_bus_speed msp)207 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
208 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
209 enum pci_bus_speed msp)
210 {
211 int rc = 0;
212
213 /*
214 * If other slots on the same bus are occupied, we cannot
215 * change the bus speed.
216 */
217 if (flag) {
218 if (asp < bsp) {
219 ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n",
220 bsp, asp);
221 rc = WRONG_BUS_FREQUENCY;
222 }
223 return rc;
224 }
225
226 if (asp < msp) {
227 if (bsp != asp)
228 rc = change_bus_speed(ctrl, pslot, asp);
229 } else {
230 if (bsp != msp)
231 rc = change_bus_speed(ctrl, pslot, msp);
232 }
233 return rc;
234 }
235
236 /**
237 * board_added - Called after a board has been added to the system.
238 * @p_slot: target &slot
239 *
240 * Turns power on for the board.
241 * Configures board.
242 */
board_added(struct slot * p_slot)243 static int board_added(struct slot *p_slot)
244 {
245 u8 hp_slot;
246 u8 slots_not_empty = 0;
247 int rc = 0;
248 enum pci_bus_speed asp, bsp, msp;
249 struct controller *ctrl = p_slot->ctrl;
250 struct pci_bus *parent = ctrl->pci_dev->subordinate;
251
252 hp_slot = p_slot->device - ctrl->slot_device_offset;
253
254 ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
255 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
256
257 /* Power on slot without connecting to bus */
258 rc = p_slot->hpc_ops->power_on_slot(p_slot);
259 if (rc) {
260 ctrl_err(ctrl, "Failed to power on slot\n");
261 return -1;
262 }
263
264 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
265 rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz);
266 if (rc) {
267 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
268 __func__);
269 return WRONG_BUS_FREQUENCY;
270 }
271
272 /* turn on board, blink green LED, turn off Amber LED */
273 rc = p_slot->hpc_ops->slot_enable(p_slot);
274 if (rc) {
275 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
276 return rc;
277 }
278 }
279
280 rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
281 if (rc) {
282 ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n");
283 return WRONG_BUS_FREQUENCY;
284 }
285
286 bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
287 msp = ctrl->pci_dev->subordinate->max_bus_speed;
288
289 /* Check if there are other slots or devices on the same bus */
290 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
291 slots_not_empty = 1;
292
293 ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
294 __func__, slots_not_empty, asp,
295 bsp, msp);
296
297 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
298 if (rc)
299 return rc;
300
301 /* turn on board, blink green LED, turn off Amber LED */
302 rc = p_slot->hpc_ops->slot_enable(p_slot);
303 if (rc) {
304 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
305 return rc;
306 }
307
308 /* Wait for ~1 second */
309 msleep(1000);
310
311 ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
312 /* Check for a power fault */
313 if (p_slot->status == 0xFF) {
314 /* power fault occurred, but it was benign */
315 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
316 rc = POWER_FAILURE;
317 p_slot->status = 0;
318 goto err_exit;
319 }
320
321 if (shpchp_configure_device(p_slot)) {
322 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
323 pci_domain_nr(parent), p_slot->bus, p_slot->device);
324 goto err_exit;
325 }
326
327 p_slot->status = 0;
328 p_slot->is_a_board = 0x01;
329 p_slot->pwr_save = 1;
330
331 p_slot->hpc_ops->green_led_on(p_slot);
332
333 return 0;
334
335 err_exit:
336 /* turn off slot, turn on Amber LED, turn off Green LED */
337 rc = p_slot->hpc_ops->slot_disable(p_slot);
338 if (rc) {
339 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
340 __func__);
341 return rc;
342 }
343
344 return(rc);
345 }
346
347
348 /**
349 * remove_board - Turns off slot and LEDs
350 * @p_slot: target &slot
351 */
remove_board(struct slot * p_slot)352 static int remove_board(struct slot *p_slot)
353 {
354 struct controller *ctrl = p_slot->ctrl;
355 u8 hp_slot;
356 int rc;
357
358 if (shpchp_unconfigure_device(p_slot))
359 return(1);
360
361 hp_slot = p_slot->device - ctrl->slot_device_offset;
362 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
363
364 ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
365
366 /* Change status to shutdown */
367 if (p_slot->is_a_board)
368 p_slot->status = 0x01;
369
370 /* turn off slot, turn on Amber LED, turn off Green LED */
371 rc = p_slot->hpc_ops->slot_disable(p_slot);
372 if (rc) {
373 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
374 __func__);
375 return rc;
376 }
377
378 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
379 if (rc) {
380 ctrl_err(ctrl, "Issue of Set Attention command failed\n");
381 return rc;
382 }
383
384 p_slot->pwr_save = 0;
385 p_slot->is_a_board = 0;
386
387 return 0;
388 }
389
390
391 struct pushbutton_work_info {
392 struct slot *p_slot;
393 struct work_struct work;
394 };
395
396 /**
397 * shpchp_pushbutton_thread - handle pushbutton events
398 * @work: &struct work_struct to be handled
399 *
400 * Scheduled procedure to handle blocking stuff for the pushbuttons.
401 * Handles all pending events and exits.
402 */
shpchp_pushbutton_thread(struct work_struct * work)403 static void shpchp_pushbutton_thread(struct work_struct *work)
404 {
405 struct pushbutton_work_info *info =
406 container_of(work, struct pushbutton_work_info, work);
407 struct slot *p_slot = info->p_slot;
408
409 mutex_lock(&p_slot->lock);
410 switch (p_slot->state) {
411 case POWEROFF_STATE:
412 mutex_unlock(&p_slot->lock);
413 shpchp_disable_slot(p_slot);
414 mutex_lock(&p_slot->lock);
415 p_slot->state = STATIC_STATE;
416 break;
417 case POWERON_STATE:
418 mutex_unlock(&p_slot->lock);
419 if (shpchp_enable_slot(p_slot))
420 p_slot->hpc_ops->green_led_off(p_slot);
421 mutex_lock(&p_slot->lock);
422 p_slot->state = STATIC_STATE;
423 break;
424 default:
425 break;
426 }
427 mutex_unlock(&p_slot->lock);
428
429 kfree(info);
430 }
431
shpchp_queue_pushbutton_work(struct work_struct * work)432 void shpchp_queue_pushbutton_work(struct work_struct *work)
433 {
434 struct slot *p_slot = container_of(work, struct slot, work.work);
435 struct pushbutton_work_info *info;
436
437 info = kmalloc(sizeof(*info), GFP_KERNEL);
438 if (!info) {
439 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
440 __func__);
441 return;
442 }
443 info->p_slot = p_slot;
444 INIT_WORK(&info->work, shpchp_pushbutton_thread);
445
446 mutex_lock(&p_slot->lock);
447 switch (p_slot->state) {
448 case BLINKINGOFF_STATE:
449 p_slot->state = POWEROFF_STATE;
450 break;
451 case BLINKINGON_STATE:
452 p_slot->state = POWERON_STATE;
453 break;
454 default:
455 kfree(info);
456 goto out;
457 }
458 queue_work(p_slot->wq, &info->work);
459 out:
460 mutex_unlock(&p_slot->lock);
461 }
462
update_slot_info(struct slot * slot)463 static int update_slot_info (struct slot *slot)
464 {
465 struct hotplug_slot_info *info;
466 int result;
467
468 info = kmalloc(sizeof(*info), GFP_KERNEL);
469 if (!info)
470 return -ENOMEM;
471
472 slot->hpc_ops->get_power_status(slot, &(info->power_status));
473 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
474 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
475 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
476
477 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
478 kfree (info);
479 return result;
480 }
481
482 /*
483 * Note: This function must be called with slot->lock held
484 */
handle_button_press_event(struct slot * p_slot)485 static void handle_button_press_event(struct slot *p_slot)
486 {
487 u8 getstatus;
488 struct controller *ctrl = p_slot->ctrl;
489
490 switch (p_slot->state) {
491 case STATIC_STATE:
492 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
493 if (getstatus) {
494 p_slot->state = BLINKINGOFF_STATE;
495 ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
496 slot_name(p_slot));
497 } else {
498 p_slot->state = BLINKINGON_STATE;
499 ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
500 slot_name(p_slot));
501 }
502 /* blink green LED and turn off amber */
503 p_slot->hpc_ops->green_led_blink(p_slot);
504 p_slot->hpc_ops->set_attention_status(p_slot, 0);
505
506 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
507 break;
508 case BLINKINGOFF_STATE:
509 case BLINKINGON_STATE:
510 /*
511 * Cancel if we are still blinking; this means that we
512 * press the attention again before the 5 sec. limit
513 * expires to cancel hot-add or hot-remove
514 */
515 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
516 slot_name(p_slot));
517 cancel_delayed_work(&p_slot->work);
518 if (p_slot->state == BLINKINGOFF_STATE)
519 p_slot->hpc_ops->green_led_on(p_slot);
520 else
521 p_slot->hpc_ops->green_led_off(p_slot);
522 p_slot->hpc_ops->set_attention_status(p_slot, 0);
523 ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
524 slot_name(p_slot));
525 p_slot->state = STATIC_STATE;
526 break;
527 case POWEROFF_STATE:
528 case POWERON_STATE:
529 /*
530 * Ignore if the slot is on power-on or power-off state;
531 * this means that the previous attention button action
532 * to hot-add or hot-remove is undergoing
533 */
534 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
535 slot_name(p_slot));
536 update_slot_info(p_slot);
537 break;
538 default:
539 ctrl_warn(ctrl, "Not a valid state\n");
540 break;
541 }
542 }
543
interrupt_event_handler(struct work_struct * work)544 static void interrupt_event_handler(struct work_struct *work)
545 {
546 struct event_info *info = container_of(work, struct event_info, work);
547 struct slot *p_slot = info->p_slot;
548
549 mutex_lock(&p_slot->lock);
550 switch (info->event_type) {
551 case INT_BUTTON_PRESS:
552 handle_button_press_event(p_slot);
553 break;
554 case INT_POWER_FAULT:
555 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
556 p_slot->hpc_ops->set_attention_status(p_slot, 1);
557 p_slot->hpc_ops->green_led_off(p_slot);
558 break;
559 default:
560 update_slot_info(p_slot);
561 break;
562 }
563 mutex_unlock(&p_slot->lock);
564
565 kfree(info);
566 }
567
568
shpchp_enable_slot(struct slot * p_slot)569 static int shpchp_enable_slot (struct slot *p_slot)
570 {
571 u8 getstatus = 0;
572 int rc, retval = -ENODEV;
573 struct controller *ctrl = p_slot->ctrl;
574
575 /* Check to see if (latch closed, card present, power off) */
576 mutex_lock(&p_slot->ctrl->crit_sect);
577 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
578 if (rc || !getstatus) {
579 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
580 goto out;
581 }
582 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
583 if (rc || getstatus) {
584 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
585 goto out;
586 }
587 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
588 if (rc || getstatus) {
589 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
590 slot_name(p_slot));
591 goto out;
592 }
593
594 p_slot->is_a_board = 1;
595
596 /* We have to save the presence info for these slots */
597 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
598 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
599 ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
600 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
601
602 if (((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
603 (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
604 && p_slot->ctrl->num_slots == 1) {
605 /* handle amd pogo errata; this must be done before enable */
606 amd_pogo_errata_save_misc_reg(p_slot);
607 retval = board_added(p_slot);
608 /* handle amd pogo errata; this must be done after enable */
609 amd_pogo_errata_restore_misc_reg(p_slot);
610 } else
611 retval = board_added(p_slot);
612
613 if (retval) {
614 p_slot->hpc_ops->get_adapter_status(p_slot,
615 &(p_slot->presence_save));
616 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
617 }
618
619 update_slot_info(p_slot);
620 out:
621 mutex_unlock(&p_slot->ctrl->crit_sect);
622 return retval;
623 }
624
625
shpchp_disable_slot(struct slot * p_slot)626 static int shpchp_disable_slot (struct slot *p_slot)
627 {
628 u8 getstatus = 0;
629 int rc, retval = -ENODEV;
630 struct controller *ctrl = p_slot->ctrl;
631
632 if (!p_slot->ctrl)
633 return -ENODEV;
634
635 /* Check to see if (latch closed, card present, power on) */
636 mutex_lock(&p_slot->ctrl->crit_sect);
637
638 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
639 if (rc || !getstatus) {
640 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
641 goto out;
642 }
643 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
644 if (rc || getstatus) {
645 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
646 goto out;
647 }
648 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
649 if (rc || !getstatus) {
650 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
651 slot_name(p_slot));
652 goto out;
653 }
654
655 retval = remove_board(p_slot);
656 update_slot_info(p_slot);
657 out:
658 mutex_unlock(&p_slot->ctrl->crit_sect);
659 return retval;
660 }
661
shpchp_sysfs_enable_slot(struct slot * p_slot)662 int shpchp_sysfs_enable_slot(struct slot *p_slot)
663 {
664 int retval = -ENODEV;
665 struct controller *ctrl = p_slot->ctrl;
666
667 mutex_lock(&p_slot->lock);
668 switch (p_slot->state) {
669 case BLINKINGON_STATE:
670 cancel_delayed_work(&p_slot->work);
671 case STATIC_STATE:
672 p_slot->state = POWERON_STATE;
673 mutex_unlock(&p_slot->lock);
674 retval = shpchp_enable_slot(p_slot);
675 mutex_lock(&p_slot->lock);
676 p_slot->state = STATIC_STATE;
677 break;
678 case POWERON_STATE:
679 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
680 slot_name(p_slot));
681 break;
682 case BLINKINGOFF_STATE:
683 case POWEROFF_STATE:
684 ctrl_info(ctrl, "Already enabled on slot %s\n",
685 slot_name(p_slot));
686 break;
687 default:
688 ctrl_err(ctrl, "Not a valid state on slot %s\n",
689 slot_name(p_slot));
690 break;
691 }
692 mutex_unlock(&p_slot->lock);
693
694 return retval;
695 }
696
shpchp_sysfs_disable_slot(struct slot * p_slot)697 int shpchp_sysfs_disable_slot(struct slot *p_slot)
698 {
699 int retval = -ENODEV;
700 struct controller *ctrl = p_slot->ctrl;
701
702 mutex_lock(&p_slot->lock);
703 switch (p_slot->state) {
704 case BLINKINGOFF_STATE:
705 cancel_delayed_work(&p_slot->work);
706 case STATIC_STATE:
707 p_slot->state = POWEROFF_STATE;
708 mutex_unlock(&p_slot->lock);
709 retval = shpchp_disable_slot(p_slot);
710 mutex_lock(&p_slot->lock);
711 p_slot->state = STATIC_STATE;
712 break;
713 case POWEROFF_STATE:
714 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
715 slot_name(p_slot));
716 break;
717 case BLINKINGON_STATE:
718 case POWERON_STATE:
719 ctrl_info(ctrl, "Already disabled on slot %s\n",
720 slot_name(p_slot));
721 break;
722 default:
723 ctrl_err(ctrl, "Not a valid state on slot %s\n",
724 slot_name(p_slot));
725 break;
726 }
727 mutex_unlock(&p_slot->lock);
728
729 return retval;
730 }
731