pciehp_ctrl.c

linux 内核源代码

	default:
		break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
}

void pciehp_queue_pushbutton_work(struct work_struct *work)
{
	struct slot *p_slot = container_of(work, struct slot, work.work);
	struct power_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, pciehp_power_thread);

	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(pciehp_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)
{
	struct controller *ctrl = p_slot->ctrl;
	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("PCI slot #%s - powering off due to button "
			     "press.\n", p_slot->name);
		} else {
			p_slot->state = BLINKINGON_STATE;
			info("PCI slot #%s - powering on due to button "
			     "press.\n", p_slot->name);
		}
		/* blink green LED and turn off amber */
		if (PWR_LED(ctrl->ctrlcap))
			p_slot->hpc_ops->green_led_blink(p_slot);
		if (ATTN_LED(ctrl->ctrlcap))
			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) {
			if (PWR_LED(ctrl->ctrlcap))
				p_slot->hpc_ops->green_led_on(p_slot);
		} else {
			if (PWR_LED(ctrl->ctrlcap))
				p_slot->hpc_ops->green_led_off(p_slot);
		}
		if (ATTN_LED(ctrl->ctrlcap))
			p_slot->hpc_ops->set_attention_status(p_slot, 0);
		info("PCI slot #%s - action canceled due to button press\n",
		     p_slot->name);
		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;
	}
}

/*
 * Note: This function must be called with slot->lock held
 */
static void handle_surprise_event(struct slot *p_slot)
{
	u8 getstatus;
	struct power_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, pciehp_power_thread);

	p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (!getstatus)
		p_slot->state = POWEROFF_STATE;
	else
		p_slot->state = POWERON_STATE;

	queue_work(pciehp_wq, &info->work);
}

static void interrupt_event_handler(struct work_struct *work)
{
	struct event_info *info = container_of(work, struct event_info, work);
	struct slot *p_slot = info->p_slot;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (info->event_type) {
	case INT_BUTTON_PRESS:
		handle_button_press_event(p_slot);
		break;
	case INT_POWER_FAULT:
		if (!POWER_CTRL(ctrl->ctrlcap))
			break;
		if (ATTN_LED(ctrl->ctrlcap))
			p_slot->hpc_ops->set_attention_status(p_slot, 1);
		if (PWR_LED(ctrl->ctrlcap))
			p_slot->hpc_ops->green_led_off(p_slot);
		break;
	case INT_PRESENCE_ON:
	case INT_PRESENCE_OFF:
		if (!HP_SUPR_RM(ctrl->ctrlcap))
			break;
		dbg("Surprise Removal\n");
		update_slot_info(p_slot);
		handle_surprise_event(p_slot);
		break;
	default:
		update_slot_info(p_slot);
		break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
}

int pciehp_enable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int rc;

	/* 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(%s)\n", __FUNCTION__,
		     p_slot->name);
		mutex_unlock(&p_slot->ctrl->crit_sect);
		return -ENODEV;
	}
	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
		rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		if (rc || getstatus) {
			info("%s: latch open on slot(%s)\n", __FUNCTION__,
			     p_slot->name);
			mutex_unlock(&p_slot->ctrl->crit_sect);
			return -ENODEV;
		}
	}

	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
		rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (rc || getstatus) {
			info("%s: already enabled on slot(%s)\n", __FUNCTION__,
			     p_slot->name);
			mutex_unlock(&p_slot->ctrl->crit_sect);
			return -EINVAL;
		}
	}

	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

	rc = board_added(p_slot);
	if (rc) {
		p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	}

	update_slot_info(p_slot);

	mutex_unlock(&p_slot->ctrl->crit_sect);
	return rc;
}


int pciehp_disable_slot(struct slot *p_slot)
{
	u8 getstatus = 0;
	int ret = 0;

	if (!p_slot->ctrl)
		return 1;

	/* Check to see if (latch closed, card present, power on) */
	mutex_lock(&p_slot->ctrl->crit_sect);

	if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
		ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			info("%s: no adapter on slot(%s)\n", __FUNCTION__,
			     p_slot->name);
			mutex_unlock(&p_slot->ctrl->crit_sect);
			return -ENODEV;
		}
	}

	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
		ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
		if (ret || getstatus) {
			info("%s: latch open on slot(%s)\n", __FUNCTION__,
			     p_slot->name);
			mutex_unlock(&p_slot->ctrl->crit_sect);
			return -ENODEV;
		}
	}

	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
		ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
		if (ret || !getstatus) {
			info("%s: already disabled slot(%s)\n", __FUNCTION__,
			     p_slot->name);
			mutex_unlock(&p_slot->ctrl->crit_sect);
			return -EINVAL;
		}
		/*
		 * After turning power off, we must wait for at least
		 * 1 second before taking any action that relies on
		 * power having been removed from the slot/adapter.
		 */
		msleep(1000);
	}

	ret = remove_board(p_slot);
	update_slot_info(p_slot);

	mutex_unlock(&p_slot->ctrl->crit_sect);
	return ret;
}

int pciehp_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 = pciehp_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 pciehp_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 = pciehp_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;
}