linux/drivers/pci/hotplug/shpchp_ctrl.c
Kenji Kaneshige a246fa4e9f [PATCH] shpchp: Fix slot state handling
Current SHPCHP driver doesn't care about the confliction between
hotplug operation via sysfs and hotplug operation via attention
button. So if those ware conflicted, slot could be an unexpected
state.

This patch changes SHPCHP driver to handle slot state properly. With
this patch, slot events are handled according to the current slot
state as shown at the Table below.

		Table. Slot States and Event Handling
=========================================================================
Slot State		Event and Action
=========================================================================
STATIC			- Go to POWERON state if user initiates
(Slot enabled,		  insertion request via sysfs
 Slot disabled)		- Go to POWEROFF state if user initiates removal
			  request via sysfs
			- Go to BLINKINGON state if user presses
			  attention button when the slot is disabled
			- Go to BLINKINGOFF state if user presses
			  attention button when the slot is enabled
2006-03-23 14:35:13 -08:00

801 lines
21 KiB
C

/*
* Standard Hot Plug Controller Driver
*
* Copyright (C) 1995,2001 Compaq Computer Corporation
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001 IBM Corp.
* Copyright (C) 2003-2004 Intel Corporation
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/smp_lock.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
#include "../pci.h"
#include "shpchp.h"
static void interrupt_event_handler(void *data);
static int shpchp_enable_slot(struct slot *p_slot);
static int shpchp_disable_slot(struct slot *p_slot);
static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
{
struct event_info *info;
info = kmalloc(sizeof(*info), GFP_ATOMIC);
if (!info)
return -ENOMEM;
info->event_type = event_type;
info->p_slot = p_slot;
INIT_WORK(&info->work, interrupt_event_handler, info);
schedule_work(&info->work);
return 0;
}
u8 shpchp_handle_attention_button(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u32 event_type;
/* Attention Button Change */
dbg("shpchp: Attention button interrupt received.\n");
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
/*
* Button pressed - See if need to TAKE ACTION!!!
*/
info("Button pressed on Slot(%d)\n", ctrl->first_slot + hp_slot);
event_type = INT_BUTTON_PRESS;
queue_interrupt_event(p_slot, event_type);
return 0;
}
u8 shpchp_handle_switch_change(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u8 getstatus;
u32 event_type;
/* Switch Change */
dbg("shpchp: Switch interrupt received.\n");
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
dbg("%s: Card present %x Power status %x\n", __FUNCTION__,
p_slot->presence_save, p_slot->pwr_save);
if (getstatus) {
/*
* Switch opened
*/
info("Latch open on Slot(%d)\n", ctrl->first_slot + hp_slot);
event_type = INT_SWITCH_OPEN;
if (p_slot->pwr_save && p_slot->presence_save) {
event_type = INT_POWER_FAULT;
err("Surprise Removal of card\n");
}
} else {
/*
* Switch closed
*/
info("Latch close on Slot(%d)\n", ctrl->first_slot + hp_slot);
event_type = INT_SWITCH_CLOSE;
}
queue_interrupt_event(p_slot, event_type);
return 1;
}
u8 shpchp_handle_presence_change(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u32 event_type;
/* Presence Change */
dbg("shpchp: Presence/Notify input change.\n");
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
/*
* Save the presence state
*/
p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
if (p_slot->presence_save) {
/*
* Card Present
*/
info("Card present on Slot(%d)\n", ctrl->first_slot + hp_slot);
event_type = INT_PRESENCE_ON;
} else {
/*
* Not Present
*/
info("Card not present on Slot(%d)\n", ctrl->first_slot + hp_slot);
event_type = INT_PRESENCE_OFF;
}
queue_interrupt_event(p_slot, event_type);
return 1;
}
u8 shpchp_handle_power_fault(u8 hp_slot, void *inst_id)
{
struct controller *ctrl = (struct controller *) inst_id;
struct slot *p_slot;
u32 event_type;
/* Power fault */
dbg("shpchp: Power fault interrupt received.\n");
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
/*
* Power fault Cleared
*/
info("Power fault cleared on Slot(%d)\n", ctrl->first_slot + hp_slot);
p_slot->status = 0x00;
event_type = INT_POWER_FAULT_CLEAR;
} else {
/*
* Power fault
*/
info("Power fault on Slot(%d)\n", ctrl->first_slot + hp_slot);
event_type = INT_POWER_FAULT;
/* set power fault status for this board */
p_slot->status = 0xFF;
info("power fault bit %x set\n", hp_slot);
}
queue_interrupt_event(p_slot, event_type);
return 1;
}
/* The following routines constitute the bulk of the
hotplug controller logic
*/
static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
enum pci_bus_speed speed)
{
int rc = 0;
dbg("%s: change to speed %d\n", __FUNCTION__, speed);
if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
return rc;
}
static int 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)
{
int rc = 0;
if (flag != 0) { /* Other slots on the same bus are occupied */
if ( asp < bsp ) {
err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bsp, asp);
return WRONG_BUS_FREQUENCY;
}
} else {
/* Other slots on the same bus are empty */
if (msp == bsp) {
/* if adapter_speed >= bus_speed, do nothing */
if (asp < bsp) {
/*
* Try to lower bus speed to accommodate the adapter if other slots
* on the same controller are empty
*/
if ((rc = change_bus_speed(ctrl, pslot, asp)))
return rc;
}
} else {
if (asp < msp) {
if ((rc = change_bus_speed(ctrl, pslot, asp)))
return rc;
} else {
if ((rc = change_bus_speed(ctrl, pslot, msp)))
return rc;
}
}
}
return rc;
}
/**
* board_added - Called after a board has been added to the system.
*
* Turns power on for the board
* Configures board
*
*/
static int board_added(struct slot *p_slot)
{
u8 hp_slot;
u8 slots_not_empty = 0;
int rc = 0;
enum pci_bus_speed adapter_speed, bus_speed, max_bus_speed;
u8 pi, mode;
struct controller *ctrl = p_slot->ctrl;
hp_slot = p_slot->device - ctrl->slot_device_offset;
dbg("%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
__FUNCTION__, p_slot->device,
ctrl->slot_device_offset, hp_slot);
/* Power on slot without connecting to bus */
rc = p_slot->hpc_ops->power_on_slot(p_slot);
if (rc) {
err("%s: Failed to power on slot\n", __FUNCTION__);
return -1;
}
if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
if (slots_not_empty)
return WRONG_BUS_FREQUENCY;
if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
/* turn on board, blink green LED, turn off Amber LED */
if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
return rc;
}
}
rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &adapter_speed);
/* 0 = PCI 33Mhz, 1 = PCI 66 Mhz, 2 = PCI-X 66 PA, 4 = PCI-X 66 ECC, */
/* 5 = PCI-X 133 PA, 7 = PCI-X 133 ECC, 0xa = PCI-X 133 Mhz 266, */
/* 0xd = PCI-X 133 Mhz 533 */
/* This encoding is different from the one used in cur_bus_speed & */
/* max_bus_speed */
if (rc || adapter_speed == PCI_SPEED_UNKNOWN) {
err("%s: Can't get adapter speed or bus mode mismatch\n", __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bus_speed);
if (rc || bus_speed == PCI_SPEED_UNKNOWN) {
err("%s: Can't get bus operation speed\n", __FUNCTION__);
return WRONG_BUS_FREQUENCY;
}
rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &max_bus_speed);
if (rc || max_bus_speed == PCI_SPEED_UNKNOWN) {
err("%s: Can't get max bus operation speed\n", __FUNCTION__);
max_bus_speed = bus_speed;
}
if ((rc = p_slot->hpc_ops->get_prog_int(p_slot, &pi))) {
err("%s: Can't get controller programming interface, set it to 1\n", __FUNCTION__);
pi = 1;
}
/* Check if there are other slots or devices on the same bus */
if (!list_empty(&ctrl->pci_dev->subordinate->devices))
slots_not_empty = 1;
dbg("%s: slots_not_empty %d, pi %d\n", __FUNCTION__,
slots_not_empty, pi);
dbg("adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
adapter_speed, bus_speed, max_bus_speed);
if (pi == 2) {
dbg("%s: In PI = %d\n", __FUNCTION__, pi);
if ((rc = p_slot->hpc_ops->get_mode1_ECC_cap(p_slot, &mode))) {
err("%s: Can't get Mode1_ECC, set mode to 0\n", __FUNCTION__);
mode = 0;
}
switch (adapter_speed) {
case PCI_SPEED_133MHz_PCIX_533:
case PCI_SPEED_133MHz_PCIX_266:
if ((bus_speed != adapter_speed) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
break;
case PCI_SPEED_133MHz_PCIX_ECC:
case PCI_SPEED_133MHz_PCIX:
if (mode) { /* Bus - Mode 1 ECC */
if ((bus_speed != 0x7) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
} else {
if ((bus_speed != 0x4) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
}
break;
case PCI_SPEED_66MHz_PCIX_ECC:
case PCI_SPEED_66MHz_PCIX:
if (mode) { /* Bus - Mode 1 ECC */
if ((bus_speed != 0x5) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
} else {
if ((bus_speed != 0x2) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
}
break;
case PCI_SPEED_66MHz:
if ((bus_speed != 0x1) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
break;
case PCI_SPEED_33MHz:
if (bus_speed > 0x0) {
if (slots_not_empty == 0) {
if ((rc = change_bus_speed(ctrl, p_slot, adapter_speed)))
return rc;
} else {
err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bus_speed, adapter_speed);
return WRONG_BUS_FREQUENCY;
}
}
break;
default:
err("%s: speed of bus %x and adapter %x mismatch\n", __FUNCTION__, bus_speed, adapter_speed);
return WRONG_BUS_FREQUENCY;
}
} else {
/* If adpater_speed == bus_speed, nothing to do here */
dbg("%s: In PI = %d\n", __FUNCTION__, pi);
if ((adapter_speed != bus_speed) &&
((rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, adapter_speed, bus_speed, max_bus_speed))))
return rc;
}
/* turn on board, blink green LED, turn off Amber LED */
if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
return rc;
}
/* Wait for ~1 second */
msleep(1000);
dbg("%s: slot status = %x\n", __FUNCTION__, p_slot->status);
/* Check for a power fault */
if (p_slot->status == 0xFF) {
/* power fault occurred, but it was benign */
dbg("%s: power fault\n", __FUNCTION__);
rc = POWER_FAILURE;
p_slot->status = 0;
goto err_exit;
}
if (shpchp_configure_device(p_slot)) {
err("Cannot add device at 0x%x:0x%x\n", p_slot->bus,
p_slot->device);
goto err_exit;
}
p_slot->status = 0;
p_slot->is_a_board = 0x01;
p_slot->pwr_save = 1;
p_slot->hpc_ops->green_led_on(p_slot);
return 0;
err_exit:
/* turn off slot, turn on Amber LED, turn off Green LED */
rc = p_slot->hpc_ops->slot_disable(p_slot);
if (rc) {
err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
return rc;
}
return(rc);
}
/**
* remove_board - Turns off slot and LED's
*
*/
static int remove_board(struct slot *p_slot)
{
struct controller *ctrl = p_slot->ctrl;
u8 hp_slot;
int rc;
if (shpchp_unconfigure_device(p_slot))
return(1);
hp_slot = p_slot->device - ctrl->slot_device_offset;
p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
/* Change status to shutdown */
if (p_slot->is_a_board)
p_slot->status = 0x01;
/* turn off slot, turn on Amber LED, turn off Green LED */
rc = p_slot->hpc_ops->slot_disable(p_slot);
if (rc) {
err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
return rc;
}
rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
if (rc) {
err("%s: Issue of Set Attention command failed\n", __FUNCTION__);
return rc;
}
p_slot->pwr_save = 0;
p_slot->is_a_board = 0;
return 0;
}
struct pushbutton_work_info {
struct slot *p_slot;
struct work_struct work;
};
/**
* shpchp_pushbutton_thread
*
* Scheduled procedure to handle blocking stuff for the pushbuttons
* Handles all pending events and exits.
*
*/
static void shpchp_pushbutton_thread(void *data)
{
struct pushbutton_work_info *info = data;
struct slot *p_slot = info->p_slot;
mutex_lock(&p_slot->lock);
switch (p_slot->state) {
case POWEROFF_STATE:
mutex_unlock(&p_slot->lock);
shpchp_disable_slot(p_slot);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
break;
case POWERON_STATE:
mutex_unlock(&p_slot->lock);
if (shpchp_enable_slot(p_slot))
p_slot->hpc_ops->green_led_off(p_slot);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
break;
default:
break;
}
mutex_unlock(&p_slot->lock);
kfree(info);
}
void queue_pushbutton_work(void *data)
{
struct slot *p_slot = data;
struct pushbutton_work_info *info;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
err("%s: Cannot allocate memory\n", __FUNCTION__);
return;
}
info->p_slot = p_slot;
INIT_WORK(&info->work, shpchp_pushbutton_thread, info);
mutex_lock(&p_slot->lock);
switch (p_slot->state) {
case BLINKINGOFF_STATE:
p_slot->state = POWEROFF_STATE;
break;
case BLINKINGON_STATE:
p_slot->state = POWERON_STATE;
break;
default:
goto out;
}
queue_work(shpchp_wq, &info->work);
out:
mutex_unlock(&p_slot->lock);
}
static int update_slot_info (struct slot *slot)
{
struct hotplug_slot_info *info;
int result;
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
slot->hpc_ops->get_power_status(slot, &(info->power_status));
slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
result = pci_hp_change_slot_info(slot->hotplug_slot, info);
kfree (info);
return result;
}
/*
* Note: This function must be called with slot->lock held
*/
static void handle_button_press_event(struct slot *p_slot)
{
u8 getstatus;
switch (p_slot->state) {
case STATIC_STATE:
p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (getstatus) {
p_slot->state = BLINKINGOFF_STATE;
info(msg_button_off, p_slot->number);
} else {
p_slot->state = BLINKINGON_STATE;
info(msg_button_on, p_slot->number);
}
/* blink green LED and turn off amber */
p_slot->hpc_ops->green_led_blink(p_slot);
p_slot->hpc_ops->set_attention_status(p_slot, 0);
schedule_delayed_work(&p_slot->work, 5*HZ);
break;
case BLINKINGOFF_STATE:
case BLINKINGON_STATE:
/*
* Cancel if we are still blinking; this means that we
* press the attention again before the 5 sec. limit
* expires to cancel hot-add or hot-remove
*/
info("Button cancel on Slot(%s)\n", p_slot->name);
dbg("%s: button cancel\n", __FUNCTION__);
cancel_delayed_work(&p_slot->work);
if (p_slot->state == BLINKINGOFF_STATE)
p_slot->hpc_ops->green_led_on(p_slot);
else
p_slot->hpc_ops->green_led_off(p_slot);
p_slot->hpc_ops->set_attention_status(p_slot, 0);
info(msg_button_cancel, p_slot->number);
p_slot->state = STATIC_STATE;
break;
case POWEROFF_STATE:
case POWERON_STATE:
/*
* Ignore if the slot is on power-on or power-off state;
* this means that the previous attention button action
* to hot-add or hot-remove is undergoing
*/
info("Button ignore on Slot(%s)\n", p_slot->name);
update_slot_info(p_slot);
break;
default:
warn("Not a valid state\n");
break;
}
}
static void interrupt_event_handler(void *data)
{
struct event_info *info = data;
struct slot *p_slot = info->p_slot;
mutex_lock(&p_slot->lock);
switch (info->event_type) {
case INT_BUTTON_PRESS:
handle_button_press_event(p_slot);
break;
case INT_POWER_FAULT:
dbg("%s: power fault\n", __FUNCTION__);
p_slot->hpc_ops->set_attention_status(p_slot, 1);
p_slot->hpc_ops->green_led_off(p_slot);
break;
default:
update_slot_info(p_slot);
break;
}
mutex_unlock(&p_slot->lock);
kfree(info);
}
static int shpchp_enable_slot (struct slot *p_slot)
{
u8 getstatus = 0;
int rc, retval = -ENODEV;
/* Check to see if (latch closed, card present, power off) */
mutex_lock(&p_slot->ctrl->crit_sect);
rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
if (rc || !getstatus) {
info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
goto out;
}
rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
if (rc || getstatus) {
info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
goto out;
}
rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (rc || getstatus) {
info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
goto out;
}
p_slot->is_a_board = 1;
/* We have to save the presence info for these slots */
p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
dbg("%s: p_slot->pwr_save %x\n", __FUNCTION__, p_slot->pwr_save);
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
(p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
&& p_slot->ctrl->num_slots == 1) {
/* handle amd pogo errata; this must be done before enable */
amd_pogo_errata_save_misc_reg(p_slot);
retval = board_added(p_slot);
/* handle amd pogo errata; this must be done after enable */
amd_pogo_errata_restore_misc_reg(p_slot);
} else
retval = board_added(p_slot);
if (retval) {
p_slot->hpc_ops->get_adapter_status(p_slot,
&(p_slot->presence_save));
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
}
update_slot_info(p_slot);
out:
mutex_unlock(&p_slot->ctrl->crit_sect);
return retval;
}
static int shpchp_disable_slot (struct slot *p_slot)
{
u8 getstatus = 0;
int rc, retval = -ENODEV;
if (!p_slot->ctrl)
return -ENODEV;
/* Check to see if (latch closed, card present, power on) */
mutex_lock(&p_slot->ctrl->crit_sect);
rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
if (rc || !getstatus) {
info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
goto out;
}
rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
if (rc || getstatus) {
info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
goto out;
}
rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
if (rc || !getstatus) {
info("%s: already disabled slot(%x)\n", __FUNCTION__, p_slot->number);
goto out;
}
retval = remove_board(p_slot);
update_slot_info(p_slot);
out:
mutex_unlock(&p_slot->ctrl->crit_sect);
return retval;
}
int shpchp_sysfs_enable_slot(struct slot *p_slot)
{
int retval = -ENODEV;
mutex_lock(&p_slot->lock);
switch (p_slot->state) {
case BLINKINGON_STATE:
cancel_delayed_work(&p_slot->work);
case STATIC_STATE:
p_slot->state = POWERON_STATE;
mutex_unlock(&p_slot->lock);
retval = shpchp_enable_slot(p_slot);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
break;
case POWERON_STATE:
info("Slot %s is already in powering on state\n",
p_slot->name);
break;
case BLINKINGOFF_STATE:
case POWEROFF_STATE:
info("Already enabled on slot %s\n", p_slot->name);
break;
default:
err("Not a valid state on slot %s\n", p_slot->name);
break;
}
mutex_unlock(&p_slot->lock);
return retval;
}
int shpchp_sysfs_disable_slot(struct slot *p_slot)
{
int retval = -ENODEV;
mutex_lock(&p_slot->lock);
switch (p_slot->state) {
case BLINKINGOFF_STATE:
cancel_delayed_work(&p_slot->work);
case STATIC_STATE:
p_slot->state = POWEROFF_STATE;
mutex_unlock(&p_slot->lock);
retval = shpchp_disable_slot(p_slot);
mutex_lock(&p_slot->lock);
p_slot->state = STATIC_STATE;
break;
case POWEROFF_STATE:
info("Slot %s is already in powering off state\n",
p_slot->name);
break;
case BLINKINGON_STATE:
case POWERON_STATE:
info("Already disabled on slot %s\n", p_slot->name);
break;
default:
err("Not a valid state on slot %s\n", p_slot->name);
break;
}
mutex_unlock(&p_slot->lock);
return retval;
}