ec.c

static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_ec_read_info, PDE(inode)->data);
}

static struct file_operations acpi_ec_info_ops = {
	.open		= acpi_ec_info_open_fs,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.owner = THIS_MODULE,
};

static int
acpi_ec_add_fs (
	struct acpi_device	*device)
{
	struct proc_dir_entry	*entry = NULL;

	ACPI_FUNCTION_TRACE("acpi_ec_add_fs");

	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
			acpi_ec_dir);
		if (!acpi_device_dir(device))
			return_VALUE(-ENODEV);
	}

	entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
		acpi_device_dir(device));
	if (!entry)
		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
			"Unable to create '%s' fs entry\n",
			ACPI_EC_FILE_INFO));
	else {
		entry->proc_fops = &acpi_ec_info_ops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	return_VALUE(0);
}


static int
acpi_ec_remove_fs (
	struct acpi_device	*device)
{
	ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
		acpi_device_dir(device) = NULL;
	}

	return_VALUE(0);
}


/* --------------------------------------------------------------------------
                               Driver Interface
   -------------------------------------------------------------------------- */


static int
acpi_ec_polling_add (
	struct acpi_device	*device)
{
	int			result = 0;
	acpi_status		status = AE_OK;
	union acpi_ec		*ec = NULL;
	unsigned long		uid;

	ACPI_FUNCTION_TRACE("acpi_ec_add");

	if (!device)
		return_VALUE(-EINVAL);

	ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec)
		return_VALUE(-ENOMEM);
	memset(ec, 0, sizeof(union acpi_ec));

	ec->common.handle = device->handle;
	ec->common.uid = -1;
	spin_lock_init(&ec->polling.lock);
	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
	acpi_driver_data(device) = ec;

	/* Use the global lock for all EC transactions? */
	acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, &ec->common.global_lock);

	/* If our UID matches the UID for the ECDT-enumerated EC,
	   we now have the *real* EC info, so kill the makeshift one.*/
	acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
	if (ec_ecdt && ec_ecdt->common.uid == uid) {
		acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
	
		acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, &acpi_ec_gpe_handler);

		kfree(ec_ecdt);
	}

	/* Get GPE bit assignment (EC events). */
	/* TODO: Add support for _GPE returning a package */
	status = acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, &ec->common.gpe_bit);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
			"Error obtaining GPE bit assignment\n"));
		result = -ENODEV;
		goto end;
	}

	result = acpi_ec_add_fs(device);
	if (result)
		goto end;

	printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
		acpi_device_name(device), acpi_device_bid(device),
		(u32) ec->common.gpe_bit);

	if (!first_ec)
		first_ec = device;

end:
	if (result)
		kfree(ec);

	return_VALUE(result);
}
static int
acpi_ec_burst_add (
	struct acpi_device	*device)
{
	int			result = 0;
	acpi_status		status = AE_OK;
	union acpi_ec		*ec = NULL;
	unsigned long		uid;

	ACPI_FUNCTION_TRACE("acpi_ec_add");

	if (!device)
		return_VALUE(-EINVAL);

	ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec)
		return_VALUE(-ENOMEM);
	memset(ec, 0, sizeof(union acpi_ec));

	ec->common.handle = device->handle;
	ec->common.uid = -1;
 	atomic_set(&ec->burst.pending_gpe, 0);
 	atomic_set(&ec->burst.leaving_burst , 1);
 	init_MUTEX(&ec->burst.sem);
 	init_waitqueue_head(&ec->burst.wait);
	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
	acpi_driver_data(device) = ec;

	/* Use the global lock for all EC transactions? */
	acpi_evaluate_integer(ec->common.handle, "_GLK", NULL, &ec->common.global_lock);

	/* If our UID matches the UID for the ECDT-enumerated EC,
	   we now have the *real* EC info, so kill the makeshift one.*/
	acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
	if (ec_ecdt && ec_ecdt->common.uid == uid) {
		acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);

		acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit, &acpi_ec_gpe_handler);

		kfree(ec_ecdt);
	}

	/* Get GPE bit assignment (EC events). */
	/* TODO: Add support for _GPE returning a package */
	status = acpi_evaluate_integer(ec->common.handle, "_GPE", NULL, &ec->common.gpe_bit);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
			"Error obtaining GPE bit assignment\n"));
		result = -ENODEV;
		goto end;
	}

	result = acpi_ec_add_fs(device);
	if (result)
		goto end;

	printk("burst-mode-ec-10-Aug\n");
	printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
		acpi_device_name(device), acpi_device_bid(device),
		(u32) ec->common.gpe_bit);

	if (!first_ec)
		first_ec = device;

end:
	if (result)
		kfree(ec);

	return_VALUE(result);
}


static int
acpi_ec_remove (
	struct acpi_device	*device,
	int			type)
{
	union acpi_ec		*ec = NULL;

	ACPI_FUNCTION_TRACE("acpi_ec_remove");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	acpi_ec_remove_fs(device);

	kfree(ec);

	return_VALUE(0);
}


static acpi_status
acpi_ec_io_ports (
	struct acpi_resource	*resource,
	void			*context)
{
	union acpi_ec		*ec = (union acpi_ec *) context;
	struct acpi_generic_address *addr;

	if (resource->id != ACPI_RSTYPE_IO) {
		return AE_OK;
	}

	/*
	 * The first address region returned is the data port, and
	 * the second address region returned is the status/command
	 * port.
	 */
	if (ec->common.data_addr.register_bit_width == 0) {
		addr = &ec->common.data_addr;
	} else if (ec->common.command_addr.register_bit_width == 0) {
		addr = &ec->common.command_addr;
	} else {
		return AE_CTRL_TERMINATE;
	}

	addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	addr->register_bit_width = 8;
	addr->register_bit_offset = 0;
	addr->address = resource->data.io.min_base_address;

	return AE_OK;
}


static int
acpi_ec_start (
	struct acpi_device	*device)
{
	acpi_status		status = AE_OK;
	union acpi_ec		*ec = NULL;

	ACPI_FUNCTION_TRACE("acpi_ec_start");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	if (!ec)
		return_VALUE(-EINVAL);

	/*
	 * Get I/O port addresses. Convert to GAS format.
	 */
	status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
		acpi_ec_io_ports, ec);
	if (ACPI_FAILURE(status) || ec->common.command_addr.register_bit_width == 0) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
		return_VALUE(-ENODEV);
	}

	ec->common.status_addr = ec->common.command_addr;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
		(u32) ec->common.gpe_bit, (u32) ec->common.command_addr.address,
		(u32) ec->common.data_addr.address));


	/*
	 * Install GPE handler
	 */
	status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
		ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
	if (ACPI_FAILURE(status)) {
		return_VALUE(-ENODEV);
	}
	acpi_set_gpe_type (NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
	acpi_enable_gpe (NULL, ec->common.gpe_bit, ACPI_NOT_ISR);

	status = acpi_install_address_space_handler (ec->common.handle,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
			&acpi_ec_space_setup, ec);
	if (ACPI_FAILURE(status)) {
		acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, &acpi_ec_gpe_handler);
		return_VALUE(-ENODEV);
	}

	return_VALUE(AE_OK);
}


static int
acpi_ec_stop (
	struct acpi_device	*device,
	int			type)
{
	acpi_status		status = AE_OK;
	union acpi_ec		*ec = NULL;

	ACPI_FUNCTION_TRACE("acpi_ec_stop");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	status = acpi_remove_address_space_handler(ec->common.handle,
		ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	status = acpi_remove_gpe_handler(NULL, ec->common.gpe_bit, &acpi_ec_gpe_handler);
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	return_VALUE(0);
}

static acpi_status __init
acpi_fake_ecdt_callback (
	acpi_handle	handle,
	u32		Level,
	void		*context,
	void		**retval)
{

	if (acpi_ec_polling_mode)
		return acpi_fake_ecdt_polling_callback(handle,
			Level, context, retval);
	else
		return acpi_fake_ecdt_burst_callback(handle,
			Level, context, retval);
}

static acpi_status __init
acpi_fake_ecdt_polling_callback (
	acpi_handle	handle,
	u32		Level,
	void		*context,
	void		**retval)
{
	acpi_status	status;

	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
		acpi_ec_io_ports, ec_ecdt);
	if (ACPI_FAILURE(status))
		return status;
	ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;

	ec_ecdt->common.uid = -1;
	acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);

	status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->common.gpe_bit);
	if (ACPI_FAILURE(status))
		return status;
	spin_lock_init(&ec_ecdt->polling.lock);
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.handle = handle;

	printk(KERN_INFO PREFIX  "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
		(u32) ec_ecdt->common.gpe_bit, (u32) ec_ecdt->common.command_addr.address,
		(u32) ec_ecdt->common.data_addr.address);

	return AE_CTRL_TERMINATE;
}

static acpi_status __init
acpi_fake_ecdt_burst_callback (
	acpi_handle	handle,
	u32		Level,
	void		*context,
	void		**retval)
{
	acpi_status	status;

	init_MUTEX(&ec_ecdt->burst.sem);
	init_waitqueue_head(&ec_ecdt->burst.wait);
	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
		acpi_ec_io_ports, ec_ecdt);
	if (ACPI_FAILURE(status))
		return status;
	ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;

	ec_ecdt->common.uid = -1;
	acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);

	status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->common.gpe_bit);
	if (ACPI_FAILURE(status))
		return status;
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.handle = handle;

	printk(KERN_INFO PREFIX  "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
		(u32) ec_ecdt->common.gpe_bit, (u32) ec_ecdt->common.command_addr.address,
		(u32) ec_ecdt->common.data_addr.address);

	return AE_CTRL_TERMINATE;
}

/*
 * Some BIOS (such as some from Gateway laptops) access EC region very early
 * such as in BAT0._INI or EC._INI before an EC device is found and
 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
 * required, but if EC regison is accessed early, it is required.
 * The routine tries to workaround the BIOS bug by pre-scan EC device
 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
 * op region (since _REG isn't invoked yet). The assumption is true for
 * all systems found.
 */
static int __init
acpi_ec_fake_ecdt(void)
{
	acpi_status	status;
	int		ret = 0;

	printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");

	ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec_ecdt) {
		ret = -ENOMEM;
		goto error;
	}
	memset(ec_ecdt, 0, sizeof(union acpi_ec));

	status = acpi_get_devices (ACPI_EC_HID,
				acpi_fake_ecdt_callback,
				NULL,
				NULL);
	if (ACPI_FAILURE(status)) {
		kfree(ec_ecdt);
		ec_ecdt = NULL;
		ret = -ENODEV;
		goto error;
	}
	return 0;
error:
	printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
	return ret;
}

static int __init
acpi_ec_get_real_ecdt(void)
{
	if (acpi_ec_polling_mode)
		return acpi_ec_polling_get_real_ecdt();
	else
		return acpi_ec_burst_get_real_ecdt();
}

static int __init
acpi_ec_polling_get_real_ecdt(void)
{
	acpi_status		status;
	struct acpi_table_ecdt 	*ecdt_ptr;

	status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING, 
		(struct acpi_table_header **) &ecdt_ptr);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	printk(KERN_INFO PREFIX "Found ECDT\n");

	/*
	 * Generate a temporary ec context to use until the namespace is scanned
	 */
	ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec_ecdt)
		return -ENOMEM;
	memset(ec_ecdt, 0, sizeof(union acpi_ec));

	ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
	ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
	spin_lock_init(&ec_ecdt->polling.lock);
	/* use the GL just to be safe */
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.uid = ecdt_ptr->uid;

	status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
	if (ACPI_FAILURE(status)) {
		goto error;
	}

	return 0;
error:
	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}


static int __init
acpi_ec_burst_get_real_ecdt(void)
{
	acpi_status		status;
	struct acpi_table_ecdt 	*ecdt_ptr;

	status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
		(struct acpi_table_header **) &ecdt_ptr);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	printk(KERN_INFO PREFIX "Found ECDT\n");

	/*
	 * Generate a temporary ec context to use until the namespace is scanned
	 */
	ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec_ecdt)
		return -ENOMEM;
	memset(ec_ecdt, 0, sizeof(union acpi_ec));

 	init_MUTEX(&ec_ecdt->burst.sem);
 	init_waitqueue_head(&ec_ecdt->burst.wait);
	ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
	ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
	/* use the GL just to be safe */
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.uid = ecdt_ptr->uid;

	status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
	if (ACPI_FAILURE(status)) {
		goto error;
	}

	return 0;
error:
	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}

static int __initdata acpi_fake_ecdt_enabled;
int __init
acpi_ec_ecdt_probe (void)
{
	acpi_status		status;
	int			ret;

	ret = acpi_ec_get_real_ecdt();
	/* Try to make a fake ECDT */
	if (ret && acpi_fake_ecdt_enabled) {
		ret = acpi_ec_fake_ecdt();
	}

	if (ret)
		return 0;

	/*
	 * Install GPE handler
	 */
	status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
		ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
		ec_ecdt);
	if (ACPI_FAILURE(status)) {
		goto error;
	}
	acpi_set_gpe_type (NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
	acpi_enable_gpe (NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);

	status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
			ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
			&acpi_ec_space_setup, ec_ecdt);
	if (ACPI_FAILURE(status)) {
		acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
			&acpi_ec_gpe_handler);
		goto error;
	}

	return 0;

error:
	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}


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

	ACPI_FUNCTION_TRACE("acpi_ec_init");

	if (acpi_disabled)
		return_VALUE(0);

	acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
	if (!acpi_ec_dir)
		return_VALUE(-ENODEV);

	/* Now register the driver for the EC */
	result = acpi_bus_register_driver(&acpi_ec_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
		return_VALUE(-ENODEV);
	}

	return_VALUE(result);
}

subsys_initcall(acpi_ec_init);

/* EC driver currently not unloadable */
#if 0
static void __exit
acpi_ec_exit (void)
{
	ACPI_FUNCTION_TRACE("acpi_ec_exit");

	acpi_bus_unregister_driver(&acpi_ec_driver);

	remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);

	return_VOID;
}
#endif /* 0 */

static int __init acpi_fake_ecdt_setup(char *str)
{
	acpi_fake_ecdt_enabled = 1;
	return 0;
}

__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
static int __init acpi_ec_set_polling_mode(char *str)
{
	int burst;

	if (!get_option(&str, &burst))
		return 0;

	if (burst) {
		acpi_ec_polling_mode = EC_BURST;
		acpi_ec_driver.ops.add = acpi_ec_burst_add;
	} else {
		acpi_ec_polling_mode = EC_POLLING;
		acpi_ec_driver.ops.add = acpi_ec_polling_add;
	}
	printk(KERN_INFO PREFIX "EC %s mode.\n",
		burst ? "burst": "polling");
	return 0;
}
__setup("ec_burst=", acpi_ec_set_polling_mode);