xref: /linux/drivers/pci/hotplug/shpchp_ctrl.c (revision 3a39d672e7f48b8d6b91a09afa4b55352773b4b5)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Standard Hot Plug Controller Driver
4  *
5  * Copyright (C) 1995,2001 Compaq Computer Corporation
6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7  * Copyright (C) 2001 IBM Corp.
8  * Copyright (C) 2003-2004 Intel Corporation
9  *
10  * All rights reserved.
11  *
12  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
13  *
14  */
15 
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/pci.h>
21 #include "../pci.h"
22 #include "shpchp.h"
23 
24 static void interrupt_event_handler(struct work_struct *work);
25 static int shpchp_enable_slot(struct slot *p_slot);
26 static int shpchp_disable_slot(struct slot *p_slot);
27 
queue_interrupt_event(struct slot * p_slot,u32 event_type)28 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
29 {
30 	struct event_info *info;
31 
32 	info = kmalloc(sizeof(*info), GFP_ATOMIC);
33 	if (!info)
34 		return -ENOMEM;
35 
36 	info->event_type = event_type;
37 	info->p_slot = p_slot;
38 	INIT_WORK(&info->work, interrupt_event_handler);
39 
40 	queue_work(p_slot->wq, &info->work);
41 
42 	return 0;
43 }
44 
shpchp_handle_attention_button(u8 hp_slot,struct controller * ctrl)45 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
46 {
47 	struct slot *p_slot;
48 	u32 event_type;
49 
50 	/* Attention Button Change */
51 	ctrl_dbg(ctrl, "Attention button interrupt received\n");
52 
53 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
54 	shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
55 
56 	/*
57 	 *  Button pressed - See if need to TAKE ACTION!!!
58 	 */
59 	ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
60 	event_type = INT_BUTTON_PRESS;
61 
62 	queue_interrupt_event(p_slot, event_type);
63 
64 	return 0;
65 
66 }
67 
shpchp_handle_switch_change(u8 hp_slot,struct controller * ctrl)68 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
69 {
70 	struct slot *p_slot;
71 	u8 getstatus;
72 	u32 event_type;
73 
74 	/* Switch Change */
75 	ctrl_dbg(ctrl, "Switch interrupt received\n");
76 
77 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
78 	shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
79 	shpchp_get_latch_status(p_slot, &getstatus);
80 	ctrl_dbg(ctrl, "Card present %x Power status %x\n",
81 		 p_slot->presence_save, p_slot->pwr_save);
82 
83 	if (getstatus) {
84 		/*
85 		 * Switch opened
86 		 */
87 		ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
88 		event_type = INT_SWITCH_OPEN;
89 		if (p_slot->pwr_save && p_slot->presence_save) {
90 			event_type = INT_POWER_FAULT;
91 			ctrl_err(ctrl, "Surprise Removal of card\n");
92 		}
93 	} else {
94 		/*
95 		 *  Switch closed
96 		 */
97 		ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
98 		event_type = INT_SWITCH_CLOSE;
99 	}
100 
101 	queue_interrupt_event(p_slot, event_type);
102 
103 	return 1;
104 }
105 
shpchp_handle_presence_change(u8 hp_slot,struct controller * ctrl)106 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
107 {
108 	struct slot *p_slot;
109 	u32 event_type;
110 
111 	/* Presence Change */
112 	ctrl_dbg(ctrl, "Presence/Notify input change\n");
113 
114 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
115 
116 	/*
117 	 * Save the presence state
118 	 */
119 	shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
120 	if (p_slot->presence_save) {
121 		/*
122 		 * Card Present
123 		 */
124 		ctrl_info(ctrl, "Card present on Slot(%s)\n",
125 			  slot_name(p_slot));
126 		event_type = INT_PRESENCE_ON;
127 	} else {
128 		/*
129 		 * Not Present
130 		 */
131 		ctrl_info(ctrl, "Card not present on Slot(%s)\n",
132 			  slot_name(p_slot));
133 		event_type = INT_PRESENCE_OFF;
134 	}
135 
136 	queue_interrupt_event(p_slot, event_type);
137 
138 	return 1;
139 }
140 
shpchp_handle_power_fault(u8 hp_slot,struct controller * ctrl)141 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
142 {
143 	struct slot *p_slot;
144 	u32 event_type;
145 
146 	/* Power fault */
147 	ctrl_dbg(ctrl, "Power fault interrupt received\n");
148 
149 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
150 
151 	if (!(shpchp_query_power_fault(p_slot))) {
152 		/*
153 		 * Power fault Cleared
154 		 */
155 		ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
156 			  slot_name(p_slot));
157 		p_slot->status = 0x00;
158 		event_type = INT_POWER_FAULT_CLEAR;
159 	} else {
160 		/*
161 		 *   Power fault
162 		 */
163 		ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
164 		event_type = INT_POWER_FAULT;
165 		/* set power fault status for this board */
166 		p_slot->status = 0xFF;
167 		ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
168 	}
169 
170 	queue_interrupt_event(p_slot, event_type);
171 
172 	return 1;
173 }
174 
175 /* The following routines constitute the bulk of the
176    hotplug controller logic
177  */
change_bus_speed(struct controller * ctrl,struct slot * p_slot,enum pci_bus_speed speed)178 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
179 		enum pci_bus_speed speed)
180 {
181 	int rc = 0;
182 
183 	ctrl_dbg(ctrl, "Change speed to %d\n", speed);
184 	rc = shpchp_set_bus_speed_mode(p_slot, speed);
185 	if (rc) {
186 		ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
187 			 __func__);
188 		return WRONG_BUS_FREQUENCY;
189 	}
190 	return rc;
191 }
192 
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)193 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
194 		u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
195 		enum pci_bus_speed msp)
196 {
197 	int rc = 0;
198 
199 	/*
200 	 * If other slots on the same bus are occupied, we cannot
201 	 * change the bus speed.
202 	 */
203 	if (flag) {
204 		if (asp < bsp) {
205 			ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n",
206 				 bsp, asp);
207 			rc = WRONG_BUS_FREQUENCY;
208 		}
209 		return rc;
210 	}
211 
212 	if (asp < msp) {
213 		if (bsp != asp)
214 			rc = change_bus_speed(ctrl, pslot, asp);
215 	} else {
216 		if (bsp != msp)
217 			rc = change_bus_speed(ctrl, pslot, msp);
218 	}
219 	return rc;
220 }
221 
222 /**
223  * board_added - Called after a board has been added to the system.
224  * @p_slot: target &slot
225  *
226  * Turns power on for the board.
227  * Configures board.
228  */
board_added(struct slot * p_slot)229 static int board_added(struct slot *p_slot)
230 {
231 	u8 hp_slot;
232 	u8 slots_not_empty = 0;
233 	int rc = 0;
234 	enum pci_bus_speed asp, bsp, msp;
235 	struct controller *ctrl = p_slot->ctrl;
236 	struct pci_bus *parent = ctrl->pci_dev->subordinate;
237 
238 	hp_slot = p_slot->device - ctrl->slot_device_offset;
239 
240 	ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
241 		 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
242 
243 	/* Power on slot without connecting to bus */
244 	rc = shpchp_power_on_slot(p_slot);
245 	if (rc) {
246 		ctrl_err(ctrl, "Failed to power on slot\n");
247 		return -1;
248 	}
249 
250 	if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
251 		rc = shpchp_set_bus_speed_mode(p_slot, PCI_SPEED_33MHz);
252 		if (rc) {
253 			ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
254 				 __func__);
255 			return WRONG_BUS_FREQUENCY;
256 		}
257 
258 		/* turn on board, blink green LED, turn off Amber LED */
259 		rc = shpchp_slot_enable(p_slot);
260 		if (rc) {
261 			ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
262 			return rc;
263 		}
264 	}
265 
266 	rc = shpchp_get_adapter_speed(p_slot, &asp);
267 	if (rc) {
268 		ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n");
269 		return WRONG_BUS_FREQUENCY;
270 	}
271 
272 	bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
273 	msp = ctrl->pci_dev->subordinate->max_bus_speed;
274 
275 	/* Check if there are other slots or devices on the same bus */
276 	if (!list_empty(&ctrl->pci_dev->subordinate->devices))
277 		slots_not_empty = 1;
278 
279 	ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
280 		 __func__, slots_not_empty, asp,
281 		 bsp, msp);
282 
283 	rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
284 	if (rc)
285 		return rc;
286 
287 	/* turn on board, blink green LED, turn off Amber LED */
288 	rc = shpchp_slot_enable(p_slot);
289 	if (rc) {
290 		ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
291 		return rc;
292 	}
293 
294 	/* Wait for ~1 second */
295 	msleep(1000);
296 
297 	ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
298 	/* Check for a power fault */
299 	if (p_slot->status == 0xFF) {
300 		/* power fault occurred, but it was benign */
301 		ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
302 		p_slot->status = 0;
303 		goto err_exit;
304 	}
305 
306 	if (shpchp_configure_device(p_slot)) {
307 		ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
308 			 pci_domain_nr(parent), p_slot->bus, p_slot->device);
309 		goto err_exit;
310 	}
311 
312 	p_slot->status = 0;
313 	p_slot->is_a_board = 0x01;
314 	p_slot->pwr_save = 1;
315 
316 	shpchp_green_led_on(p_slot);
317 
318 	return 0;
319 
320 err_exit:
321 	/* turn off slot, turn on Amber LED, turn off Green LED */
322 	rc = shpchp_slot_disable(p_slot);
323 	if (rc) {
324 		ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
325 			 __func__);
326 		return rc;
327 	}
328 
329 	return(rc);
330 }
331 
332 
333 /**
334  * remove_board - Turns off slot and LEDs
335  * @p_slot: target &slot
336  */
remove_board(struct slot * p_slot)337 static int remove_board(struct slot *p_slot)
338 {
339 	struct controller *ctrl = p_slot->ctrl;
340 	u8 hp_slot;
341 	int rc;
342 
343 	shpchp_unconfigure_device(p_slot);
344 
345 	hp_slot = p_slot->device - ctrl->slot_device_offset;
346 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
347 
348 	ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
349 
350 	/* Change status to shutdown */
351 	if (p_slot->is_a_board)
352 		p_slot->status = 0x01;
353 
354 	/* turn off slot, turn on Amber LED, turn off Green LED */
355 	rc = shpchp_slot_disable(p_slot);
356 	if (rc) {
357 		ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
358 			 __func__);
359 		return rc;
360 	}
361 
362 	rc = shpchp_set_attention_status(p_slot, 0);
363 	if (rc) {
364 		ctrl_err(ctrl, "Issue of Set Attention command failed\n");
365 		return rc;
366 	}
367 
368 	p_slot->pwr_save = 0;
369 	p_slot->is_a_board = 0;
370 
371 	return 0;
372 }
373 
374 
375 struct pushbutton_work_info {
376 	struct slot *p_slot;
377 	struct work_struct work;
378 };
379 
380 /**
381  * shpchp_pushbutton_thread - handle pushbutton events
382  * @work: &struct work_struct to be handled
383  *
384  * Scheduled procedure to handle blocking stuff for the pushbuttons.
385  * Handles all pending events and exits.
386  */
shpchp_pushbutton_thread(struct work_struct * work)387 static void shpchp_pushbutton_thread(struct work_struct *work)
388 {
389 	struct pushbutton_work_info *info =
390 		container_of(work, struct pushbutton_work_info, work);
391 	struct slot *p_slot = info->p_slot;
392 
393 	mutex_lock(&p_slot->lock);
394 	switch (p_slot->state) {
395 	case POWEROFF_STATE:
396 		mutex_unlock(&p_slot->lock);
397 		shpchp_disable_slot(p_slot);
398 		mutex_lock(&p_slot->lock);
399 		p_slot->state = STATIC_STATE;
400 		break;
401 	case POWERON_STATE:
402 		mutex_unlock(&p_slot->lock);
403 		if (shpchp_enable_slot(p_slot))
404 			shpchp_green_led_off(p_slot);
405 		mutex_lock(&p_slot->lock);
406 		p_slot->state = STATIC_STATE;
407 		break;
408 	default:
409 		break;
410 	}
411 	mutex_unlock(&p_slot->lock);
412 
413 	kfree(info);
414 }
415 
shpchp_queue_pushbutton_work(struct work_struct * work)416 void shpchp_queue_pushbutton_work(struct work_struct *work)
417 {
418 	struct slot *p_slot = container_of(work, struct slot, work.work);
419 	struct pushbutton_work_info *info;
420 
421 	info = kmalloc(sizeof(*info), GFP_KERNEL);
422 	if (!info) {
423 		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
424 			 __func__);
425 		return;
426 	}
427 	info->p_slot = p_slot;
428 	INIT_WORK(&info->work, shpchp_pushbutton_thread);
429 
430 	mutex_lock(&p_slot->lock);
431 	switch (p_slot->state) {
432 	case BLINKINGOFF_STATE:
433 		p_slot->state = POWEROFF_STATE;
434 		break;
435 	case BLINKINGON_STATE:
436 		p_slot->state = POWERON_STATE;
437 		break;
438 	default:
439 		kfree(info);
440 		goto out;
441 	}
442 	queue_work(p_slot->wq, &info->work);
443  out:
444 	mutex_unlock(&p_slot->lock);
445 }
446 
update_slot_info(struct slot * slot)447 static void update_slot_info(struct slot *slot)
448 {
449 	shpchp_get_power_status(slot, &slot->pwr_save);
450 	shpchp_get_attention_status(slot, &slot->attention_save);
451 	shpchp_get_latch_status(slot, &slot->latch_save);
452 	shpchp_get_adapter_status(slot, &slot->presence_save);
453 }
454 
455 /*
456  * Note: This function must be called with slot->lock held
457  */
handle_button_press_event(struct slot * p_slot)458 static void handle_button_press_event(struct slot *p_slot)
459 {
460 	u8 getstatus;
461 	struct controller *ctrl = p_slot->ctrl;
462 
463 	switch (p_slot->state) {
464 	case STATIC_STATE:
465 		shpchp_get_power_status(p_slot, &getstatus);
466 		if (getstatus) {
467 			p_slot->state = BLINKINGOFF_STATE;
468 			ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
469 				  slot_name(p_slot));
470 		} else {
471 			p_slot->state = BLINKINGON_STATE;
472 			ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
473 				  slot_name(p_slot));
474 		}
475 		/* blink green LED and turn off amber */
476 		shpchp_green_led_blink(p_slot);
477 		shpchp_set_attention_status(p_slot, 0);
478 
479 		queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
480 		break;
481 	case BLINKINGOFF_STATE:
482 	case BLINKINGON_STATE:
483 		/*
484 		 * Cancel if we are still blinking; this means that we
485 		 * press the attention again before the 5 sec. limit
486 		 * expires to cancel hot-add or hot-remove
487 		 */
488 		ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
489 			  slot_name(p_slot));
490 		cancel_delayed_work(&p_slot->work);
491 		if (p_slot->state == BLINKINGOFF_STATE)
492 			shpchp_green_led_on(p_slot);
493 		else
494 			shpchp_green_led_off(p_slot);
495 		shpchp_set_attention_status(p_slot, 0);
496 		ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
497 			  slot_name(p_slot));
498 		p_slot->state = STATIC_STATE;
499 		break;
500 	case POWEROFF_STATE:
501 	case POWERON_STATE:
502 		/*
503 		 * Ignore if the slot is on power-on or power-off state;
504 		 * this means that the previous attention button action
505 		 * to hot-add or hot-remove is undergoing
506 		 */
507 		ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
508 			  slot_name(p_slot));
509 		update_slot_info(p_slot);
510 		break;
511 	default:
512 		ctrl_warn(ctrl, "Not a valid state\n");
513 		break;
514 	}
515 }
516 
interrupt_event_handler(struct work_struct * work)517 static void interrupt_event_handler(struct work_struct *work)
518 {
519 	struct event_info *info = container_of(work, struct event_info, work);
520 	struct slot *p_slot = info->p_slot;
521 
522 	mutex_lock(&p_slot->lock);
523 	switch (info->event_type) {
524 	case INT_BUTTON_PRESS:
525 		handle_button_press_event(p_slot);
526 		break;
527 	case INT_POWER_FAULT:
528 		ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
529 		shpchp_set_attention_status(p_slot, 1);
530 		shpchp_green_led_off(p_slot);
531 		break;
532 	default:
533 		update_slot_info(p_slot);
534 		break;
535 	}
536 	mutex_unlock(&p_slot->lock);
537 
538 	kfree(info);
539 }
540 
541 
shpchp_enable_slot(struct slot * p_slot)542 static int shpchp_enable_slot (struct slot *p_slot)
543 {
544 	u8 getstatus = 0;
545 	int rc, retval = -ENODEV;
546 	struct controller *ctrl = p_slot->ctrl;
547 
548 	/* Check to see if (latch closed, card present, power off) */
549 	mutex_lock(&p_slot->ctrl->crit_sect);
550 	rc = shpchp_get_adapter_status(p_slot, &getstatus);
551 	if (rc || !getstatus) {
552 		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
553 		goto out;
554 	}
555 	rc = shpchp_get_latch_status(p_slot, &getstatus);
556 	if (rc || getstatus) {
557 		ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
558 		goto out;
559 	}
560 	rc = shpchp_get_power_status(p_slot, &getstatus);
561 	if (rc || getstatus) {
562 		ctrl_info(ctrl, "Already enabled on slot(%s)\n",
563 			  slot_name(p_slot));
564 		goto out;
565 	}
566 
567 	p_slot->is_a_board = 1;
568 
569 	/* We have to save the presence info for these slots */
570 	shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
571 	shpchp_get_power_status(p_slot, &p_slot->pwr_save);
572 	ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
573 	shpchp_get_latch_status(p_slot, &getstatus);
574 
575 	if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD &&
576 	     p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458)
577 	     && p_slot->ctrl->num_slots == 1) {
578 		/* handle AMD POGO errata; this must be done before enable  */
579 		amd_pogo_errata_save_misc_reg(p_slot);
580 		retval = board_added(p_slot);
581 		/* handle AMD POGO errata; this must be done after enable  */
582 		amd_pogo_errata_restore_misc_reg(p_slot);
583 	} else
584 		retval = board_added(p_slot);
585 
586 	if (retval) {
587 		shpchp_get_adapter_status(p_slot, &p_slot->presence_save);
588 		shpchp_get_latch_status(p_slot, &getstatus);
589 	}
590 
591 	update_slot_info(p_slot);
592  out:
593 	mutex_unlock(&p_slot->ctrl->crit_sect);
594 	return retval;
595 }
596 
597 
shpchp_disable_slot(struct slot * p_slot)598 static int shpchp_disable_slot (struct slot *p_slot)
599 {
600 	u8 getstatus = 0;
601 	int rc, retval = -ENODEV;
602 	struct controller *ctrl = p_slot->ctrl;
603 
604 	if (!p_slot->ctrl)
605 		return -ENODEV;
606 
607 	/* Check to see if (latch closed, card present, power on) */
608 	mutex_lock(&p_slot->ctrl->crit_sect);
609 
610 	rc = shpchp_get_adapter_status(p_slot, &getstatus);
611 	if (rc || !getstatus) {
612 		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
613 		goto out;
614 	}
615 	rc = shpchp_get_latch_status(p_slot, &getstatus);
616 	if (rc || getstatus) {
617 		ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
618 		goto out;
619 	}
620 	rc = shpchp_get_power_status(p_slot, &getstatus);
621 	if (rc || !getstatus) {
622 		ctrl_info(ctrl, "Already disabled on slot(%s)\n",
623 			  slot_name(p_slot));
624 		goto out;
625 	}
626 
627 	retval = remove_board(p_slot);
628 	update_slot_info(p_slot);
629  out:
630 	mutex_unlock(&p_slot->ctrl->crit_sect);
631 	return retval;
632 }
633 
shpchp_sysfs_enable_slot(struct slot * p_slot)634 int shpchp_sysfs_enable_slot(struct slot *p_slot)
635 {
636 	int retval = -ENODEV;
637 	struct controller *ctrl = p_slot->ctrl;
638 
639 	mutex_lock(&p_slot->lock);
640 	switch (p_slot->state) {
641 	case BLINKINGON_STATE:
642 		cancel_delayed_work(&p_slot->work);
643 		fallthrough;
644 	case STATIC_STATE:
645 		p_slot->state = POWERON_STATE;
646 		mutex_unlock(&p_slot->lock);
647 		retval = shpchp_enable_slot(p_slot);
648 		mutex_lock(&p_slot->lock);
649 		p_slot->state = STATIC_STATE;
650 		break;
651 	case POWERON_STATE:
652 		ctrl_info(ctrl, "Slot %s is already in powering on state\n",
653 			  slot_name(p_slot));
654 		break;
655 	case BLINKINGOFF_STATE:
656 	case POWEROFF_STATE:
657 		ctrl_info(ctrl, "Already enabled on slot %s\n",
658 			  slot_name(p_slot));
659 		break;
660 	default:
661 		ctrl_err(ctrl, "Not a valid state on slot %s\n",
662 			 slot_name(p_slot));
663 		break;
664 	}
665 	mutex_unlock(&p_slot->lock);
666 
667 	return retval;
668 }
669 
shpchp_sysfs_disable_slot(struct slot * p_slot)670 int shpchp_sysfs_disable_slot(struct slot *p_slot)
671 {
672 	int retval = -ENODEV;
673 	struct controller *ctrl = p_slot->ctrl;
674 
675 	mutex_lock(&p_slot->lock);
676 	switch (p_slot->state) {
677 	case BLINKINGOFF_STATE:
678 		cancel_delayed_work(&p_slot->work);
679 		fallthrough;
680 	case STATIC_STATE:
681 		p_slot->state = POWEROFF_STATE;
682 		mutex_unlock(&p_slot->lock);
683 		retval = shpchp_disable_slot(p_slot);
684 		mutex_lock(&p_slot->lock);
685 		p_slot->state = STATIC_STATE;
686 		break;
687 	case POWEROFF_STATE:
688 		ctrl_info(ctrl, "Slot %s is already in powering off state\n",
689 			  slot_name(p_slot));
690 		break;
691 	case BLINKINGON_STATE:
692 	case POWERON_STATE:
693 		ctrl_info(ctrl, "Already disabled on slot %s\n",
694 			  slot_name(p_slot));
695 		break;
696 	default:
697 		ctrl_err(ctrl, "Not a valid state on slot %s\n",
698 			 slot_name(p_slot));
699 		break;
700 	}
701 	mutex_unlock(&p_slot->lock);
702 
703 	return retval;
704 }
705