fingerprint/fingerprint.h - SHIFTPHONES/android_device_shift_otter - Gitiles

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H
 #define ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H

 #include <hardware/hardware.h>
 #include <hardware/hw_auth_token.h>

 #define FINGERPRINT_MODULE_API_VERSION_1_0 HARDWARE_MODULE_API_VERSION(1, 0)
 #define FINGERPRINT_MODULE_API_VERSION_2_0 HARDWARE_MODULE_API_VERSION(2, 0)
 #define FINGERPRINT_MODULE_API_VERSION_2_1 HARDWARE_MODULE_API_VERSION(2, 1)
 #define FINGERPRINT_MODULE_API_VERSION_3_0 HARDWARE_MODULE_API_VERSION(3, 0)
 #define FINGERPRINT_HARDWARE_MODULE_ID "fingerprint"

 typedef enum fingerprint_msg_type {
     FINGERPRINT_ERROR = -1,
     FINGERPRINT_ACQUIRED = 1,
     FINGERPRINT_TEMPLATE_ENROLLING = 3,
     FINGERPRINT_TEMPLATE_REMOVED = 4,
     FINGERPRINT_AUTHENTICATED = 5,
     FINGERPRINT_TEMPLATE_ENUMERATING = 6,
 } fingerprint_msg_type_t;

 /*
  * Fingerprint errors are meant to tell the framework to terminate the current operation and ask
  * for the user to correct the situation. These will almost always result in messaging and user
  * interaction to correct the problem.
  *
  * For example, FINGERPRINT_ERROR_CANCELED should follow any acquisition message that results in
  * a situation where the current operation can't continue without user interaction. For example,
  * if the sensor is dirty during enrollment and no further enrollment progress can be made,
  * send FINGERPRINT_ACQUIRED_IMAGER_DIRTY followed by FINGERPRINT_ERROR_CANCELED.
  */
 typedef enum fingerprint_error {
     FINGERPRINT_ERROR_HW_UNAVAILABLE = 1, /* The hardware has an error that can't be resolved. */
     FINGERPRINT_ERROR_UNABLE_TO_PROCESS = 2, /* Bad data; operation can't continue */
     FINGERPRINT_ERROR_TIMEOUT = 3, /* The operation has timed out waiting for user input. */
     FINGERPRINT_ERROR_NO_SPACE = 4, /* No space available to store a template */
     FINGERPRINT_ERROR_CANCELED = 5, /* The current operation can't proceed. See above. */
     FINGERPRINT_ERROR_UNABLE_TO_REMOVE = 6, /* fingerprint with given id can't be removed */
     FINGERPRINT_ERROR_LOCKOUT = 7, /* the fingerprint hardware is in lockout due to too many attempts */
     FINGERPRINT_ERROR_VENDOR_BASE = 1000 /* vendor-specific error messages start here */
 } fingerprint_error_t;

 /*
  * Fingerprint acquisition info is meant as feedback for the current operation.  Anything but
  * FINGERPRINT_ACQUIRED_GOOD will be shown to the user as feedback on how to take action on the
  * current operation. For example, FINGERPRINT_ACQUIRED_IMAGER_DIRTY can be used to tell the user
  * to clean the sensor.  If this will cause the current operation to fail, an additional
  * FINGERPRINT_ERROR_CANCELED can be sent to stop the operation in progress (e.g. enrollment).
  * In general, these messages will result in a "Try again" message.
  */
 typedef enum fingerprint_acquired_info {
     FINGERPRINT_ACQUIRED_GOOD = 0,
     FINGERPRINT_ACQUIRED_PARTIAL = 1, /* sensor needs more data, i.e. longer swipe. */
     FINGERPRINT_ACQUIRED_INSUFFICIENT = 2, /* image doesn't contain enough detail for recognition*/
     FINGERPRINT_ACQUIRED_IMAGER_DIRTY = 3, /* sensor needs to be cleaned */
     FINGERPRINT_ACQUIRED_TOO_SLOW = 4, /* mostly swipe-type sensors; not enough data collected */
     FINGERPRINT_ACQUIRED_TOO_FAST = 5, /* for swipe and area sensors; tell user to slow down*/
     FINGERPRINT_ACQUIRED_DETECTED = 6, /* when the finger is first detected. Used to optimize wakeup.
                                           Should be followed by one of the above messages */
     FINGERPRINT_ACQUIRED_VENDOR_BASE = 1000 /* vendor-specific acquisition messages start here */
 } fingerprint_acquired_info_t;

 typedef struct fingerprint_finger_id {
     uint32_t gid;
     uint32_t fid;
 } fingerprint_finger_id_t;

 typedef struct fingerprint_enroll {
     fingerprint_finger_id_t finger;
     /* samples_remaining goes from N (no data collected, but N scans needed)
      * to 0 (no more data is needed to build a template). */
     uint32_t samples_remaining;
     uint64_t msg; /* Vendor specific message. Used for user guidance */
 } fingerprint_enroll_t;

 typedef struct fingerprint_iterator {
     fingerprint_finger_id_t finger;
     uint32_t remaining_templates;
 } fingerprint_iterator_t;

 typedef fingerprint_iterator_t fingerprint_enumerated_t;
 typedef fingerprint_iterator_t fingerprint_removed_t;

 typedef struct fingerprint_acquired {
     fingerprint_acquired_info_t acquired_info; /* information about the image */
 } fingerprint_acquired_t;

 typedef struct fingerprint_authenticated {
     fingerprint_finger_id_t finger;
     hw_auth_token_t hat;
 } fingerprint_authenticated_t;

 typedef struct fingerprint_msg {
     fingerprint_msg_type_t type;
     union {
         fingerprint_error_t error;
         fingerprint_enroll_t enroll;
         fingerprint_enumerated_t enumerated;
         fingerprint_removed_t removed;
         fingerprint_acquired_t acquired;
         fingerprint_authenticated_t authenticated;
     } data;
 } fingerprint_msg_t;

 /* Callback function type */
 typedef void (*fingerprint_notify_t)(const fingerprint_msg_t *msg);

 /* Synchronous operation */
 typedef struct fingerprint_device {
     /**
      * Common methods of the fingerprint device. This *must* be the first member
      * of fingerprint_device as users of this structure will cast a hw_device_t
      * to fingerprint_device pointer in contexts where it's known
      * the hw_device_t references a fingerprint_device.
      */
     struct hw_device_t common;

     /*
      * Client provided callback function to receive notifications.
      * Do not set by hand, use the function above instead.
      */
     fingerprint_notify_t notify;

     /*
      * Set notification callback:
      * Registers a user function that would receive notifications from the HAL
      * The call will block if the HAL state machine is in busy state until HAL
      * leaves the busy state.
      *
      * Function return: 0 if callback function is successfuly registered
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*set_notify)(struct fingerprint_device *dev, fingerprint_notify_t notify);

     /*
      * Fingerprint pre-enroll enroll request:
      * Generates a unique token to upper layers to indicate the start of an enrollment transaction.
      * This token will be wrapped by security for verification and passed to enroll() for
      * verification before enrollment will be allowed. This is to ensure adding a new fingerprint
      * template was preceded by some kind of credential confirmation (e.g. device password).
      *
      * Function return: 0 if function failed
      *                  otherwise, a uint64_t of token
      */
     uint64_t (*pre_enroll)(struct fingerprint_device *dev);

     /*
      * Fingerprint enroll request:
      * Switches the HAL state machine to collect and store a new fingerprint
      * template. Switches back as soon as enroll is complete
      * (fingerprint_msg.type == FINGERPRINT_TEMPLATE_ENROLLING &&
      *  fingerprint_msg.data.enroll.samples_remaining == 0)
      * or after timeout_sec seconds.
      * The fingerprint template will be assigned to the group gid. User has a choice
      * to supply the gid or set it to 0 in which case a unique group id will be generated.
      *
      * Function return: 0 if enrollment process can be successfully started
      *                  or a negative number in case of error, generally from the errno.h set.
      *                  A notify() function may be called indicating the error condition.
      */
     int (*enroll)(struct fingerprint_device *dev, const hw_auth_token_t *hat,
                     uint32_t gid, uint32_t timeout_sec);

     /*
      * Finishes the enroll operation and invalidates the pre_enroll() generated challenge.
      * This will be called at the end of a multi-finger enrollment session to indicate
      * that no more fingers will be added.
      *
      * Function return: 0 if the request is accepted
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*post_enroll)(struct fingerprint_device *dev);

     /*
      * get_authenticator_id:
      * Returns a token associated with the current fingerprint set. This value will
      * change whenever a new fingerprint is enrolled, thus creating a new fingerprint
      * set.
      *
      * Function return: current authenticator id or 0 if function failed.
      */
     uint64_t (*get_authenticator_id)(struct fingerprint_device *dev);

     /*
      * Cancel pending enroll or authenticate, sending FINGERPRINT_ERROR_CANCELED
      * to all running clients. Switches the HAL state machine back to the idle state.
      * Unlike enroll_done() doesn't invalidate the pre_enroll() challenge.
      *
      * Function return: 0 if cancel request is accepted
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*cancel)(struct fingerprint_device *dev);

     /*
      * Enumerate all the fingerprint templates found in the directory set by
      * set_active_group()
      * For each template found a notify() will be called with:
      * fingerprint_msg.type == FINGERPRINT_TEMPLATE_ENUMERATED
      * fingerprint_msg.data.enumerated.finger indicating a template id
      * fingerprint_msg.data.enumerated.remaining_templates indicating how many more
      * enumeration messages to expect.
      * Note: If there are no fingerprints, then this should return 0 and the first fingerprint
      *                  enumerated should have fingerid=0 and remaining=0
      * Function return: 0 if enumerate request is accepted
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*enumerate)(struct fingerprint_device *dev);

     /*
      * Fingerprint remove request:
      * Deletes a fingerprint template.
      * Works only within the path set by set_active_group().
      * The fid parameter can be used as a widcard:
      *   * fid == 0 -- delete all the templates in the group.
      *   * fid != 0 -- delete this specific template from the group.
      * For each template found a notify() will be called with:
      * fingerprint_msg.type == FINGERPRINT_TEMPLATE_REMOVED
      * fingerprint_msg.data.removed.finger indicating a template id deleted
      * fingerprint_msg.data.removed.remaining_templates indicating how many more
      * templates will be deleted by this operation.
      *
      * Function return: 0 if fingerprint template(s) can be successfully deleted
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*remove)(struct fingerprint_device *dev, uint32_t gid, uint32_t fid);

     /*
      * Restricts the HAL operation to a set of fingerprints belonging to a
      * group provided.
      * The caller must provide a path to a storage location within the user's
      * data directory.
      *
      * Function return: 0 on success
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*set_active_group)(struct fingerprint_device *dev, uint32_t gid,
                             const char *store_path);

     /*
      * Authenticates an operation identifed by operation_id
      *
      * Function return: 0 on success
      *                  or a negative number in case of error, generally from the errno.h set.
      */
     int (*authenticate)(struct fingerprint_device *dev, uint64_t operation_id, uint32_t gid);

     /* Goodix */
     int (*send_customized_command)(struct fingerprint_device *dev, uint32_t command, uint32_t extras);

     /* Reserved for backward binary compatibility */
     void *reserved[4];
 } fingerprint_device_t;

 typedef struct fingerprint_module {
     /**
      * Common methods of the fingerprint module. This *must* be the first member
      * of fingerprint_module as users of this structure will cast a hw_module_t
      * to fingerprint_module pointer in contexts where it's known
      * the hw_module_t references a fingerprint_module.
      */
     struct hw_module_t common;
 } fingerprint_module_t;

 #endif  /* ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H */
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H
	#define ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H

	#include <hardware/hardware.h>
	#include <hardware/hw_auth_token.h>

	#define FINGERPRINT_MODULE_API_VERSION_1_0 HARDWARE_MODULE_API_VERSION(1, 0)
	#define FINGERPRINT_MODULE_API_VERSION_2_0 HARDWARE_MODULE_API_VERSION(2, 0)
	#define FINGERPRINT_MODULE_API_VERSION_2_1 HARDWARE_MODULE_API_VERSION(2, 1)
	#define FINGERPRINT_MODULE_API_VERSION_3_0 HARDWARE_MODULE_API_VERSION(3, 0)
	#define FINGERPRINT_HARDWARE_MODULE_ID "fingerprint"

	typedef enum fingerprint_msg_type {
	FINGERPRINT_ERROR = -1,
	FINGERPRINT_ACQUIRED = 1,
	FINGERPRINT_TEMPLATE_ENROLLING = 3,
	FINGERPRINT_TEMPLATE_REMOVED = 4,
	FINGERPRINT_AUTHENTICATED = 5,
	FINGERPRINT_TEMPLATE_ENUMERATING = 6,
	} fingerprint_msg_type_t;

	/*
	* Fingerprint errors are meant to tell the framework to terminate the current operation and ask
	* for the user to correct the situation. These will almost always result in messaging and user
	* interaction to correct the problem.
	*
	* For example, FINGERPRINT_ERROR_CANCELED should follow any acquisition message that results in
	* a situation where the current operation can't continue without user interaction. For example,
	* if the sensor is dirty during enrollment and no further enrollment progress can be made,
	* send FINGERPRINT_ACQUIRED_IMAGER_DIRTY followed by FINGERPRINT_ERROR_CANCELED.
	*/
	typedef enum fingerprint_error {
	FINGERPRINT_ERROR_HW_UNAVAILABLE = 1, /* The hardware has an error that can't be resolved. */
	FINGERPRINT_ERROR_UNABLE_TO_PROCESS = 2, /* Bad data; operation can't continue */
	FINGERPRINT_ERROR_TIMEOUT = 3, /* The operation has timed out waiting for user input. */
	FINGERPRINT_ERROR_NO_SPACE = 4, /* No space available to store a template */
	FINGERPRINT_ERROR_CANCELED = 5, /* The current operation can't proceed. See above. */
	FINGERPRINT_ERROR_UNABLE_TO_REMOVE = 6, /* fingerprint with given id can't be removed */
	FINGERPRINT_ERROR_LOCKOUT = 7, /* the fingerprint hardware is in lockout due to too many attempts */
	FINGERPRINT_ERROR_VENDOR_BASE = 1000 /* vendor-specific error messages start here */
	} fingerprint_error_t;

	/*
	* Fingerprint acquisition info is meant as feedback for the current operation. Anything but
	* FINGERPRINT_ACQUIRED_GOOD will be shown to the user as feedback on how to take action on the
	* current operation. For example, FINGERPRINT_ACQUIRED_IMAGER_DIRTY can be used to tell the user
	* to clean the sensor. If this will cause the current operation to fail, an additional
	* FINGERPRINT_ERROR_CANCELED can be sent to stop the operation in progress (e.g. enrollment).
	* In general, these messages will result in a "Try again" message.
	*/
	typedef enum fingerprint_acquired_info {
	FINGERPRINT_ACQUIRED_GOOD = 0,
	FINGERPRINT_ACQUIRED_PARTIAL = 1, /* sensor needs more data, i.e. longer swipe. */
	FINGERPRINT_ACQUIRED_INSUFFICIENT = 2, /* image doesn't contain enough detail for recognition*/
	FINGERPRINT_ACQUIRED_IMAGER_DIRTY = 3, /* sensor needs to be cleaned */
	FINGERPRINT_ACQUIRED_TOO_SLOW = 4, /* mostly swipe-type sensors; not enough data collected */
	FINGERPRINT_ACQUIRED_TOO_FAST = 5, /* for swipe and area sensors; tell user to slow down*/
	FINGERPRINT_ACQUIRED_DETECTED = 6, /* when the finger is first detected. Used to optimize wakeup.
	Should be followed by one of the above messages */
	FINGERPRINT_ACQUIRED_VENDOR_BASE = 1000 /* vendor-specific acquisition messages start here */
	} fingerprint_acquired_info_t;

	typedef struct fingerprint_finger_id {
	uint32_t gid;
	uint32_t fid;
	} fingerprint_finger_id_t;

	typedef struct fingerprint_enroll {
	fingerprint_finger_id_t finger;
	/* samples_remaining goes from N (no data collected, but N scans needed)
	* to 0 (no more data is needed to build a template). */
	uint32_t samples_remaining;
	uint64_t msg; /* Vendor specific message. Used for user guidance */
	} fingerprint_enroll_t;

	typedef struct fingerprint_iterator {
	fingerprint_finger_id_t finger;
	uint32_t remaining_templates;
	} fingerprint_iterator_t;

	typedef fingerprint_iterator_t fingerprint_enumerated_t;
	typedef fingerprint_iterator_t fingerprint_removed_t;

	typedef struct fingerprint_acquired {
	fingerprint_acquired_info_t acquired_info; /* information about the image */
	} fingerprint_acquired_t;

	typedef struct fingerprint_authenticated {
	fingerprint_finger_id_t finger;
	hw_auth_token_t hat;
	} fingerprint_authenticated_t;

	typedef struct fingerprint_msg {
	fingerprint_msg_type_t type;
	union {
	fingerprint_error_t error;
	fingerprint_enroll_t enroll;
	fingerprint_enumerated_t enumerated;
	fingerprint_removed_t removed;
	fingerprint_acquired_t acquired;
	fingerprint_authenticated_t authenticated;
	} data;
	} fingerprint_msg_t;

	/* Callback function type */
	typedef void (fingerprint_notify_t)(const fingerprint_msg_t msg);

	/* Synchronous operation */
	typedef struct fingerprint_device {
	/**
	* Common methods of the fingerprint device. This must be the first member
	* of fingerprint_device as users of this structure will cast a hw_device_t
	* to fingerprint_device pointer in contexts where it's known
	* the hw_device_t references a fingerprint_device.
	*/
	struct hw_device_t common;

	/*
	* Client provided callback function to receive notifications.
	* Do not set by hand, use the function above instead.
	*/
	fingerprint_notify_t notify;

	/*
	* Set notification callback:
	* Registers a user function that would receive notifications from the HAL
	* The call will block if the HAL state machine is in busy state until HAL
	* leaves the busy state.
	*
	* Function return: 0 if callback function is successfuly registered
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (set_notify)(struct fingerprint_device dev, fingerprint_notify_t notify);

	/*
	* Fingerprint pre-enroll enroll request:
	* Generates a unique token to upper layers to indicate the start of an enrollment transaction.
	* This token will be wrapped by security for verification and passed to enroll() for
	* verification before enrollment will be allowed. This is to ensure adding a new fingerprint
	* template was preceded by some kind of credential confirmation (e.g. device password).
	*
	* Function return: 0 if function failed
	* otherwise, a uint64_t of token
	*/
	uint64_t (pre_enroll)(struct fingerprint_device dev);

	/*
	* Fingerprint enroll request:
	* Switches the HAL state machine to collect and store a new fingerprint
	* template. Switches back as soon as enroll is complete
	* (fingerprint_msg.type == FINGERPRINT_TEMPLATE_ENROLLING &&
	* fingerprint_msg.data.enroll.samples_remaining == 0)
	* or after timeout_sec seconds.
	* The fingerprint template will be assigned to the group gid. User has a choice
	* to supply the gid or set it to 0 in which case a unique group id will be generated.
	*
	* Function return: 0 if enrollment process can be successfully started
	* or a negative number in case of error, generally from the errno.h set.
	* A notify() function may be called indicating the error condition.
	*/
	int (enroll)(struct fingerprint_device dev, const hw_auth_token_t *hat,
	uint32_t gid, uint32_t timeout_sec);

	/*
	* Finishes the enroll operation and invalidates the pre_enroll() generated challenge.
	* This will be called at the end of a multi-finger enrollment session to indicate
	* that no more fingers will be added.
	*
	* Function return: 0 if the request is accepted
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (post_enroll)(struct fingerprint_device dev);

	/*
	* get_authenticator_id:
	* Returns a token associated with the current fingerprint set. This value will
	* change whenever a new fingerprint is enrolled, thus creating a new fingerprint
	* set.
	*
	* Function return: current authenticator id or 0 if function failed.
	*/
	uint64_t (get_authenticator_id)(struct fingerprint_device dev);

	/*
	* Cancel pending enroll or authenticate, sending FINGERPRINT_ERROR_CANCELED
	* to all running clients. Switches the HAL state machine back to the idle state.
	* Unlike enroll_done() doesn't invalidate the pre_enroll() challenge.
	*
	* Function return: 0 if cancel request is accepted
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (cancel)(struct fingerprint_device dev);

	/*
	* Enumerate all the fingerprint templates found in the directory set by
	* set_active_group()
	* For each template found a notify() will be called with:
	* fingerprint_msg.type == FINGERPRINT_TEMPLATE_ENUMERATED
	* fingerprint_msg.data.enumerated.finger indicating a template id
	* fingerprint_msg.data.enumerated.remaining_templates indicating how many more
	* enumeration messages to expect.
	* Note: If there are no fingerprints, then this should return 0 and the first fingerprint
	* enumerated should have fingerid=0 and remaining=0
	* Function return: 0 if enumerate request is accepted
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (enumerate)(struct fingerprint_device dev);

	/*
	* Fingerprint remove request:
	* Deletes a fingerprint template.
	* Works only within the path set by set_active_group().
	* The fid parameter can be used as a widcard:
	* * fid == 0 -- delete all the templates in the group.
	* * fid != 0 -- delete this specific template from the group.
	* For each template found a notify() will be called with:
	* fingerprint_msg.type == FINGERPRINT_TEMPLATE_REMOVED
	* fingerprint_msg.data.removed.finger indicating a template id deleted
	* fingerprint_msg.data.removed.remaining_templates indicating how many more
	* templates will be deleted by this operation.
	*
	* Function return: 0 if fingerprint template(s) can be successfully deleted
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (remove)(struct fingerprint_device dev, uint32_t gid, uint32_t fid);

	/*
	* Restricts the HAL operation to a set of fingerprints belonging to a
	* group provided.
	* The caller must provide a path to a storage location within the user's
	* data directory.
	*
	* Function return: 0 on success
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (set_active_group)(struct fingerprint_device dev, uint32_t gid,
	const char *store_path);

	/*
	* Authenticates an operation identifed by operation_id
	*
	* Function return: 0 on success
	* or a negative number in case of error, generally from the errno.h set.
	*/
	int (authenticate)(struct fingerprint_device dev, uint64_t operation_id, uint32_t gid);

	/* Goodix */
	int (send_customized_command)(struct fingerprint_device dev, uint32_t command, uint32_t extras);

	/* Reserved for backward binary compatibility */
	void *reserved[4];
	} fingerprint_device_t;

	typedef struct fingerprint_module {
	/**
	* Common methods of the fingerprint module. This must be the first member
	* of fingerprint_module as users of this structure will cast a hw_module_t
	* to fingerprint_module pointer in contexts where it's known
	* the hw_module_t references a fingerprint_module.
	*/
	struct hw_module_t common;
	} fingerprint_module_t;

	#endif /* ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H */