pciehp_ctrl.c

linux-2.6.15.6

	u8 getstatus;
	
	pushbutton_pending = 0;

	if (!p_slot) {
		dbg("%s: Error! slot NULL\n", __FUNCTION__);
		return;
	}

	p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (getstatus) {
		p_slot->state = POWEROFF_STATE;
		dbg("%s: disabling bus:device(%x:%x)\n", __FUNCTION__,
				p_slot->bus, p_slot->device);

		pciehp_disable_slot(p_slot);
		p_slot->state = STATIC_STATE;
	} else {
		p_slot->state = POWERON_STATE;
		dbg("%s: adding bus:device(%x:%x)\n", __FUNCTION__,
				p_slot->bus, p_slot->device);

		if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
			/* Wait for exclusive access to hardware */
			down(&p_slot->ctrl->crit_sect);

			p_slot->hpc_ops->green_led_off(p_slot);

			/* Wait for the command to complete */
			wait_for_ctrl_irq (p_slot->ctrl);

			/* Done with exclusive hardware access */
			up(&p_slot->ctrl->crit_sect);
		}
		p_slot->state = STATIC_STATE;
	}

	return;
}

/**
 * pciehp_surprise_rm_thread
 *
 * Scheduled procedure to handle blocking stuff for the surprise removal
 * Handles all pending events and exits.
 *
 */
static void pciehp_surprise_rm_thread(unsigned long slot)
{
	struct slot *p_slot = (struct slot *) slot;
	u8 getstatus;
	
	surprise_rm_pending = 0;

	if (!p_slot) {
		dbg("%s: Error! slot NULL\n", __FUNCTION__);
		return;
	}

	p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (!getstatus) {
		p_slot->state = POWEROFF_STATE;
		dbg("%s: removing bus:device(%x:%x)\n",
				__FUNCTION__, p_slot->bus, p_slot->device);

		pciehp_disable_slot(p_slot);
		p_slot->state = STATIC_STATE;
	} else {
		p_slot->state = POWERON_STATE;
		dbg("%s: adding bus:device(%x:%x)\n",
				__FUNCTION__, p_slot->bus, p_slot->device);

		if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl->ctrlcap)) {
			/* Wait for exclusive access to hardware */
			down(&p_slot->ctrl->crit_sect);

			p_slot->hpc_ops->green_led_off(p_slot);

			/* Wait for the command to complete */
			wait_for_ctrl_irq (p_slot->ctrl);

			/* Done with exclusive hardware access */
			up(&p_slot->ctrl->crit_sect);
		}
		p_slot->state = STATIC_STATE;
	}

	return;
}



/* this is the main worker thread */
static int event_thread(void* data)
{
	struct controller *ctrl;
	lock_kernel();
	daemonize("pciehpd_event");

	unlock_kernel();

	while (1) {
		dbg("!!!!event_thread sleeping\n");
		down_interruptible (&event_semaphore);
		dbg("event_thread woken finished = %d\n", event_finished);
		if (event_finished || signal_pending(current))
			break;
		/* Do stuff here */
		if (pushbutton_pending)
			pciehp_pushbutton_thread(pushbutton_pending);
		else if (surprise_rm_pending)
			pciehp_surprise_rm_thread(surprise_rm_pending);
		else
			for (ctrl = pciehp_ctrl_list; ctrl; ctrl=ctrl->next)
				interrupt_event_handler(ctrl);
	}
	dbg("event_thread signals exit\n");
	up(&event_exit);
	return 0;
}

int pciehp_event_start_thread(void)
{
	int pid;

	/* initialize our semaphores */
	init_MUTEX_LOCKED(&event_exit);
	event_finished=0;

	init_MUTEX_LOCKED(&event_semaphore);
	pid = kernel_thread(event_thread, NULL, 0);

	if (pid < 0) {
		err ("Can't start up our event thread\n");
		return -1;
	}
	return 0;
}


void pciehp_event_stop_thread(void)
{
	event_finished = 1;
	up(&event_semaphore);
	down(&event_exit);
}


static int update_slot_info(struct slot *slot)
{
	struct hotplug_slot_info *info;
	/* char buffer[SLOT_NAME_SIZE]; */
	int result;

	info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	/* make_slot_name (&buffer[0], SLOT_NAME_SIZE, slot); */

	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(buffer, info); */
	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
	kfree (info);
	return result;
}

static void interrupt_event_handler(struct controller *ctrl)
{
	int loop = 0;
	int change = 1;
	u8 hp_slot;
	u8 getstatus;
	struct slot *p_slot;

	while (change) {
		change = 0;

		for (loop = 0; loop < MAX_EVENTS; loop++) {
			if (ctrl->event_queue[loop].event_type != 0) {
				hp_slot = ctrl->event_queue[loop].hp_slot;

				p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

				if (ctrl->event_queue[loop].event_type == INT_BUTTON_CANCEL) {
					dbg("button cancel\n");
					del_timer(&p_slot->task_event);

					switch (p_slot->state) {
					case BLINKINGOFF_STATE:
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);
						
						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_on(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 0);

							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);
						break;
					case BLINKINGON_STATE:
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_off(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						if (ATTN_LED(ctrl->ctrlcap)){
							p_slot->hpc_ops->set_attention_status(p_slot, 0);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}
						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);

						break;
					default:
						warn("Not a valid state\n");
						return;
					}
					info(msg_button_cancel, p_slot->number);
					p_slot->state = STATIC_STATE;
				}
				/* ***********Button Pressed (No action on 1st press...) */
				else if (ctrl->event_queue[loop].event_type == INT_BUTTON_PRESS) {
					
					if (ATTN_BUTTN(ctrl->ctrlcap)) {
						dbg("Button pressed\n");
						p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
						if (getstatus) {
							/* slot is on */
							dbg("slot is on\n");
							p_slot->state = BLINKINGOFF_STATE;
							info(msg_button_off, p_slot->number);
						} else {
							/* slot is off */
							dbg("slot is off\n");
							p_slot->state = BLINKINGON_STATE;
							info(msg_button_on, p_slot->number);
						}

						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						/* blink green LED and turn off amber */
						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_blink(p_slot);
							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}

						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 0);

							/* Wait for the command to complete */
							wait_for_ctrl_irq (ctrl);
						}

						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);

						init_timer(&p_slot->task_event);
						p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
						p_slot->task_event.function = (void (*)(unsigned long)) pushbutton_helper_thread;
						p_slot->task_event.data = (unsigned long) p_slot;

						add_timer(&p_slot->task_event);
					}
				}
				/***********POWER FAULT********************/
				else if (ctrl->event_queue[loop].event_type == INT_POWER_FAULT) {
					if (POWER_CTRL(ctrl->ctrlcap)) {
						dbg("power fault\n");
						/* Wait for exclusive access to hardware */
						down(&ctrl->crit_sect);

						if (ATTN_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->set_attention_status(p_slot, 1);
							wait_for_ctrl_irq (ctrl);
						}

						if (PWR_LED(ctrl->ctrlcap)) {
							p_slot->hpc_ops->green_led_off(p_slot);
							wait_for_ctrl_irq (ctrl);
						}

						/* Done with exclusive hardware access */
						up(&ctrl->crit_sect);
					}
				}
				/***********SURPRISE REMOVAL********************/
				else if ((ctrl->event_queue[loop].event_type == INT_PRESENCE_ON) || 
					(ctrl->event_queue[loop].event_type == INT_PRESENCE_OFF)) {
					if (HP_SUPR_RM(ctrl->ctrlcap)) {
						dbg("Surprise Removal\n");
						if (p_slot) {
							surprise_rm_pending = (unsigned long) p_slot;
							up(&event_semaphore);
							update_slot_info(p_slot);
						}
					}
				} else {
					/* refresh notification */
					if (p_slot)
						update_slot_info(p_slot);
				}

				ctrl->event_queue[loop].event_type = 0;

				change = 1;
			}
		}		/* End of FOR loop */
	}
}


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

	/* Check to see if (latch closed, card present, power off) */
	down(&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);
		up(&p_slot->ctrl->crit_sect);
		return 1;
	}
	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(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}
	
	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(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}
	up(&p_slot->ctrl->crit_sect);

	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);
	}

	if (p_slot)
		update_slot_info(p_slot);

	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) */
	down(&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(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	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(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	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(%x)\n", __FUNCTION__, p_slot->number);
			up(&p_slot->ctrl->crit_sect);
			return 1;
		}
	}

	up(&p_slot->ctrl->crit_sect);

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