shpchp_ctrl.c

audio driver for hotplug pci on linux 2.6.27

	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", __func__, 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", __func__);
		return rc;
	}

	rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
	if (rc) {
		err("%s: Issue of Set Attention command failed\n", __func__);
		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 - handle pushbutton events
 * @work: &struct work_struct to be handled
 *
 * Scheduled procedure to handle blocking stuff for the pushbuttons.
 * Handles all pending events and exits.
 */
static void shpchp_pushbutton_thread(struct work_struct *work)
{
	struct pushbutton_work_info *info =
		container_of(work, struct pushbutton_work_info, work);
	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 shpchp_queue_pushbutton_work(struct work_struct *work)
{
	struct slot *p_slot = container_of(work, struct slot, work.work);
	struct pushbutton_work_info *info;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		err("%s: Cannot allocate memory\n", __func__);
		return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, shpchp_pushbutton_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(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("PCI slot #%s - powering off due to button "
			     "press.\n", slot_name(p_slot));
		} else {
			p_slot->state = BLINKINGON_STATE;
			info("PCI slot #%s - powering on due to button "
			     "press.\n", slot_name(p_slot));
		}
		/* 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", slot_name(p_slot));
		dbg("%s: button cancel\n", __func__);
		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("PCI slot #%s - action canceled due to button press\n",
		     slot_name(p_slot));
		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", slot_name(p_slot));
		update_slot_info(p_slot);
		break;
	default:
		warn("Not a valid state\n");
		break;
	}
}

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;

	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", __func__);
		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("No adapter on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	if (rc || getstatus) {
		info("Latch open on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (rc || getstatus) {
		info("Already enabled on slot(%s)\n", slot_name(p_slot));
		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", __func__, 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("No adapter on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	if (rc || getstatus) {
		info("Latch open on slot(%s)\n", slot_name(p_slot));
		goto out;
	}
	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (rc || !getstatus) {
		info("Already disabled slot(%s)\n", slot_name(p_slot));
		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",
		     slot_name(p_slot));
		break;
	case BLINKINGOFF_STATE:
	case POWEROFF_STATE:
		info("Already enabled on slot %s\n", slot_name(p_slot));
		break;
	default:
		err("Not a valid state on slot %s\n", slot_name(p_slot));
		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",
		     slot_name(p_slot));
		break;
	case BLINKINGON_STATE:
	case POWERON_STATE:
		info("Already disabled on slot %s\n", slot_name(p_slot));
		break;
	default:
		err("Not a valid state on slot %s\n", slot_name(p_slot));
		break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
}