bus.c

Linux Kernel 2.6.9 for OMAP1710

	if (status_changed)
		*status_changed = 0;

	old_status = device->status;

	/*
	 * Make sure this device's parent is present before we go about
	 * messing with the device.
	 */
	if (device->parent && !device->parent->status.present) {
		device->status = device->parent->status;
		if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
			if (status_changed)
				*status_changed = 1;
		}
		return_VALUE(0);
	}

	status = acpi_bus_get_status(device);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
		return_VALUE(0);

	if (status_changed)
		*status_changed = 1;
	
	/*
	 * Device Insertion/Removal
	 */
	if ((device->status.present) && !(old_status.present)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
		/* TBD: Handle device insertion */
	}
	else if (!(device->status.present) && (old_status.present)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
		/* TBD: Handle device removal */
	}

	return_VALUE(0);
}


static int
acpi_bus_check_scope (
	struct acpi_device	*device)
{
	int			result = 0;
	int			status_changed = 0;

	ACPI_FUNCTION_TRACE("acpi_bus_check_scope");

	if (!device)
		return_VALUE(-EINVAL);

	/* Status Change? */
	result = acpi_bus_check_device(device, &status_changed);
	if (result)
		return_VALUE(result);

	if (!status_changed)
		return_VALUE(0);

	/*
	 * TBD: Enumerate child devices within this device's scope and
	 *       run acpi_bus_check_device()'s on them.
	 */

	return_VALUE(0);
}


/**
 * acpi_bus_notify
 * ---------------
 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 */
static void 
acpi_bus_notify (
	acpi_handle             handle,
	u32                     type,
	void                    *data)
{
	int			result = 0;
	struct acpi_device	*device = NULL;

	ACPI_FUNCTION_TRACE("acpi_bus_notify");

	if (acpi_bus_get_device(handle, &device))
		return_VOID;

	switch (type) {

	case ACPI_NOTIFY_BUS_CHECK:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n", 
			device->pnp.bus_id));
		result = acpi_bus_check_scope(device);
		/* 
		 * TBD: We'll need to outsource certain events to non-ACPI
		 *	drivers via the device manager (device.c).
		 */
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n", 
			device->pnp.bus_id));
		result = acpi_bus_check_device(device, NULL);
		/* 
		 * TBD: We'll need to outsource certain events to non-ACPI
		 *	drivers via the device manager (device.c).
		 */
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n", 
			device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n", 
			device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n", 
			device->pnp.bus_id));
		/* TBD: Exactly what does 'light' mean? */
		break;

	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n", 
			device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n", 
			device->pnp.bus_id));
		/* TBD */
		break;

	case ACPI_NOTIFY_POWER_FAULT:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n", 
			device->pnp.bus_id));
		/* TBD */
		break;

	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n", 
			type));
		break;
	}

	return_VOID;
}

/* --------------------------------------------------------------------------
                             Initialization/Cleanup
   -------------------------------------------------------------------------- */

static int __init
acpi_bus_init_irq (void)
{
	acpi_status		status = AE_OK;
	union acpi_object	arg = {ACPI_TYPE_INTEGER};
	struct acpi_object_list	arg_list = {1, &arg};
	char			*message = NULL;

	ACPI_FUNCTION_TRACE("acpi_bus_init_irq");

	/* 
	 * Let the system know what interrupt model we are using by
	 * evaluating the \_PIC object, if exists.
	 */

	switch (acpi_irq_model) {
	case ACPI_IRQ_MODEL_PIC:
		message = "PIC";
		break;
	case ACPI_IRQ_MODEL_IOAPIC:
		message = "IOAPIC";
		break;
	case ACPI_IRQ_MODEL_IOSAPIC:
		message = "IOSAPIC";
		break;
	default:
		printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
		return_VALUE(-ENODEV);
	}

	printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);

	arg.integer.value = acpi_irq_model;

	status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
		return_VALUE(-ENODEV);
	}

	return_VALUE(0);
}


void __init
acpi_early_init (void)
{
	acpi_status		status = AE_OK;
	struct acpi_buffer	buffer = {sizeof(acpi_fadt), &acpi_fadt};

	ACPI_FUNCTION_TRACE("acpi_early_init");

	if (acpi_disabled)
		return;

	/* enable workarounds, unless strict ACPI spec. compliance */
	if (!acpi_strict)
		acpi_gbl_enable_interpreter_slack = TRUE;

	status = acpi_initialize_subsystem();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n");
		goto error0;
	}

	status = acpi_load_tables();
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n");
		goto error0;
	}

	/*
	 * Get a separate copy of the FADT for use by other drivers.
	 */
	status = acpi_get_table(ACPI_TABLE_FADT, 1, &buffer);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to get the FADT\n");
		goto error0;
	}

#ifdef CONFIG_X86
	if (!acpi_ioapic) {
		extern acpi_interrupt_flags acpi_sci_flags;

		/* compatible (0) means level (3) */
		if (acpi_sci_flags.trigger == 0)
			acpi_sci_flags.trigger = 3;

		/* Set PIC-mode SCI trigger type */
		acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger);
	} else {
		extern int acpi_sci_override_gsi;
		/*
		 * now that acpi_fadt is initialized,
		 * update it with result from INT_SRC_OVR parsing
		 */
		acpi_fadt.sci_int = acpi_sci_override_gsi;
	}
#endif

	status = acpi_enable_subsystem(~(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE));
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
		goto error0;
	}

	return;

error0:
	disable_acpi();
	return;
}

static int __init
acpi_bus_init (void)
{
	int			result = 0;
	acpi_status		status = AE_OK;
	extern acpi_status	acpi_os_initialize1(void);

	ACPI_FUNCTION_TRACE("acpi_bus_init");

	status = acpi_os_initialize1();

	status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n");
		goto error1;
	}

	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n");
		goto error1;
	}
#ifdef CONFIG_ACPI_EC
	/*
	 * ACPI 2.0 requires the EC driver to be loaded and work before
	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
	 * is called).
	 *
	 * This is accomplished by looking for the ECDT table, and getting 
	 * the EC parameters out of that.
	 */
	status = acpi_ec_ecdt_probe();
	/* Ignore result. Not having an ECDT is not fatal. */
#endif

	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
		goto error1;
	}

	printk(KERN_INFO PREFIX "Interpreter enabled\n");

	/*
	 * Get the system interrupt model and evaluate \_PIC.
	 */
	result = acpi_bus_init_irq();
	if (result)
		goto error1;

	/*
	 * Register the for all standard device notifications.
	 */
	status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL);
	if (ACPI_FAILURE(status)) {
		printk(KERN_ERR PREFIX "Unable to register for device notifications\n");
		goto error1;
	}

	/*
	 * Create the top ACPI proc directory
	 */
	acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);

	return_VALUE(0);

	/* Mimic structured exception handling */
error1:
	acpi_terminate();
	return_VALUE(-ENODEV);
}

decl_subsys(acpi,NULL,NULL);

static int __init acpi_init (void)
{
	int			result = 0;

	ACPI_FUNCTION_TRACE("acpi_init");

	printk(KERN_INFO PREFIX "Subsystem revision %08x\n",
		ACPI_CA_VERSION);

	if (acpi_disabled) {
		printk(KERN_INFO PREFIX "Interpreter disabled.\n");
		return -ENODEV;
	}

	firmware_register(&acpi_subsys);

	result = acpi_bus_init();

	if (!result) {
#ifdef CONFIG_PM
		if (!PM_IS_ACTIVE())
			pm_active = 1;
		else {
			printk(KERN_INFO PREFIX "APM is already active, exiting\n");
			disable_acpi();
			result = -ENODEV;
		}
#endif
	} else
		disable_acpi();

	return_VALUE(result);
}

subsys_initcall(acpi_init);