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266 lines
12 KiB
266 lines
12 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H
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#define ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H
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#include <hardware/hw_auth_token.h>
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#define FINGERPRINT_MODULE_API_VERSION_1_0 HARDWARE_MODULE_API_VERSION(1, 0)
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#define FINGERPRINT_MODULE_API_VERSION_2_0 HARDWARE_MODULE_API_VERSION(2, 0)
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#define FINGERPRINT_HARDWARE_MODULE_ID "fingerprint"
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typedef enum fingerprint_msg_type {
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FINGERPRINT_ERROR = -1,
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FINGERPRINT_ACQUIRED = 1,
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FINGERPRINT_TEMPLATE_ENROLLING = 3,
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FINGERPRINT_TEMPLATE_REMOVED = 4,
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FINGERPRINT_AUTHENTICATED = 5
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} fingerprint_msg_type_t;
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/*
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* Fingerprint errors are meant to tell the framework to terminate the current operation and ask
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* for the user to correct the situation. These will almost always result in messaging and user
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* interaction to correct the problem.
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*
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* For example, FINGERPRINT_ERROR_CANCELED should follow any acquisition message that results in
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* a situation where the current operation can't continue without user interaction. For example,
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* if the sensor is dirty during enrollment and no further enrollment progress can be made,
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* send FINGERPRINT_ACQUIRED_IMAGER_DIRTY followed by FINGERPRINT_ERROR_CANCELED.
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*/
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typedef enum fingerprint_error {
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FINGERPRINT_ERROR_HW_UNAVAILABLE = 1, /* The hardware has an error that can't be resolved. */
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FINGERPRINT_ERROR_UNABLE_TO_PROCESS = 2, /* Bad data; operation can't continue */
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FINGERPRINT_ERROR_TIMEOUT = 3, /* The operation has timed out waiting for user input. */
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FINGERPRINT_ERROR_NO_SPACE = 4, /* No space available to store a template */
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FINGERPRINT_ERROR_CANCELED = 5, /* The current operation can't proceed. See above. */
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FINGERPRINT_ERROR_UNABLE_TO_REMOVE = 6, /* fingerprint with given id can't be removed */
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FINGERPRINT_ERROR_VENDOR_BASE = 1000 /* vendor-specific error messages start here */
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} fingerprint_error_t;
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/*
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* Fingerprint acquisition info is meant as feedback for the current operation. Anything but
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* FINGERPRINT_ACQUIRED_GOOD will be shown to the user as feedback on how to take action on the
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* current operation. For example, FINGERPRINT_ACQUIRED_IMAGER_DIRTY can be used to tell the user
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* to clean the sensor. If this will cause the current operation to fail, an additional
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* FINGERPRINT_ERROR_CANCELED can be sent to stop the operation in progress (e.g. enrollment).
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* In general, these messages will result in a "Try again" message.
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*/
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typedef enum fingerprint_acquired_info {
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FINGERPRINT_ACQUIRED_GOOD = 0,
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FINGERPRINT_ACQUIRED_PARTIAL = 1, /* sensor needs more data, i.e. longer swipe. */
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FINGERPRINT_ACQUIRED_INSUFFICIENT = 2, /* image doesn't contain enough detail for recognition*/
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FINGERPRINT_ACQUIRED_IMAGER_DIRTY = 3, /* sensor needs to be cleaned */
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FINGERPRINT_ACQUIRED_TOO_SLOW = 4, /* mostly swipe-type sensors; not enough data collected */
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FINGERPRINT_ACQUIRED_TOO_FAST = 5, /* for swipe and area sensors; tell user to slow down*/
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FINGERPRINT_ACQUIRED_VENDOR_BASE = 1000 /* vendor-specific acquisition messages start here */
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} fingerprint_acquired_info_t;
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typedef struct fingerprint_finger_id {
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uint32_t gid;
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uint32_t fid;
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} fingerprint_finger_id_t;
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typedef struct fingerprint_enroll {
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fingerprint_finger_id_t finger;
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/* samples_remaining goes from N (no data collected, but N scans needed)
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* to 0 (no more data is needed to build a template). */
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uint32_t samples_remaining;
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uint64_t msg; /* Vendor specific message. Used for user guidance */
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} fingerprint_enroll_t;
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typedef struct fingerprint_removed {
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fingerprint_finger_id_t finger;
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} fingerprint_removed_t;
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typedef struct fingerprint_acquired {
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fingerprint_acquired_info_t acquired_info; /* information about the image */
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} fingerprint_acquired_t;
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typedef struct fingerprint_authenticated {
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fingerprint_finger_id_t finger;
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hw_auth_token_t hat;
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} fingerprint_authenticated_t;
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typedef struct fingerprint_msg {
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fingerprint_msg_type_t type;
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union {
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fingerprint_error_t error;
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fingerprint_enroll_t enroll;
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fingerprint_removed_t removed;
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fingerprint_acquired_t acquired;
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fingerprint_authenticated_t authenticated;
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} data;
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} fingerprint_msg_t;
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/* Callback function type */
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typedef void (*fingerprint_notify_t)(const fingerprint_msg_t *msg);
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/* Synchronous operation */
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typedef struct fingerprint_device {
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/**
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* Common methods of the fingerprint device. This *must* be the first member
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* of fingerprint_device as users of this structure will cast a hw_device_t
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* to fingerprint_device pointer in contexts where it's known
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* the hw_device_t references a fingerprint_device.
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*/
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struct hw_device_t common;
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/*
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* Client provided callback function to receive notifications.
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* Do not set by hand, use the function above instead.
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*/
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fingerprint_notify_t notify;
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/*
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* Set notification callback:
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* Registers a user function that would receive notifications from the HAL
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* The call will block if the HAL state machine is in busy state until HAL
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* leaves the busy state.
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*
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* Function return: 0 if callback function is successfuly registered
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*set_notify)(struct fingerprint_device *dev, fingerprint_notify_t notify);
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/*
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* Fingerprint pre-enroll enroll request:
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* Generates a unique token to upper layers to indicate the start of an enrollment transaction.
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* This token will be wrapped by security for verification and passed to enroll() for
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* verification before enrollment will be allowed. This is to ensure adding a new fingerprint
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* template was preceded by some kind of credential confirmation (e.g. device password).
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*
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* Function return: 0 if function failed
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* otherwise, a uint64_t of token
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*/
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uint64_t (*pre_enroll)(struct fingerprint_device *dev);
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/*
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* Fingerprint enroll request:
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* Switches the HAL state machine to collect and store a new fingerprint
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* template. Switches back as soon as enroll is complete
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* (fingerprint_msg.type == FINGERPRINT_TEMPLATE_ENROLLING &&
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* fingerprint_msg.data.enroll.samples_remaining == 0)
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* or after timeout_sec seconds.
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* The fingerprint template will be assigned to the group gid. User has a choice
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* to supply the gid or set it to 0 in which case a unique group id will be generated.
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*
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* Function return: 0 if enrollment process can be successfully started
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* or a negative number in case of error, generally from the errno.h set.
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* A notify() function may be called indicating the error condition.
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*/
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int (*enroll)(struct fingerprint_device *dev, const hw_auth_token_t *hat,
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uint32_t gid, uint32_t timeout_sec);
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/*
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* Finishes the enroll operation and invalidates the pre_enroll() generated challenge.
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* This will be called at the end of a multi-finger enrollment session to indicate
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* that no more fingers will be added.
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*
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* Function return: 0 if the request is accepted
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*post_enroll)(struct fingerprint_device *dev);
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/*
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* get_authenticator_id:
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* Returns a token associated with the current fingerprint set. This value will
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* change whenever a new fingerprint is enrolled, thus creating a new fingerprint
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* set.
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*
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* Function return: current authenticator id or 0 if function failed.
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*/
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uint64_t (*get_authenticator_id)(struct fingerprint_device *dev);
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/*
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* Cancel pending enroll or authenticate, sending FINGERPRINT_ERROR_CANCELED
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* to all running clients. Switches the HAL state machine back to the idle state.
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* Unlike enroll_done() doesn't invalidate the pre_enroll() challenge.
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*
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* Function return: 0 if cancel request is accepted
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*cancel)(struct fingerprint_device *dev);
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/*
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* Enumerate all the fingerprint templates found in the directory set by
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* set_active_group()
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* This is a synchronous call. The function takes:
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* - A pointer to an array of fingerprint_finger_id_t.
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* - The size of the array provided, in fingerprint_finger_id_t elements.
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* Max_size is a bi-directional parameter and returns the actual number
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* of elements copied to the caller supplied array.
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* In the absence of errors the function returns the total number of templates
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* in the user directory.
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* If the caller has no good guess on the size of the array he should call this
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* function witn *max_size == 0 and use the return value for the array allocation.
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* The caller of this function has a complete list of the templates when *max_size
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* is the same as the function return.
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*
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* Function return: Total number of fingerprint templates in the current storage directory.
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*enumerate)(struct fingerprint_device *dev, fingerprint_finger_id_t *results,
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uint32_t *max_size);
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/*
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* Fingerprint remove request:
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* Deletes a fingerprint template.
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* Works only within a path set by set_active_group().
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* notify() will be called with details on the template deleted.
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* fingerprint_msg.type == FINGERPRINT_TEMPLATE_REMOVED and
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* fingerprint_msg.data.removed.id indicating the template id removed.
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*
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* Function return: 0 if fingerprint template(s) can be successfully deleted
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*remove)(struct fingerprint_device *dev, uint32_t gid, uint32_t fid);
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/*
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* Restricts the HAL operation to a set of fingerprints belonging to a
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* group provided.
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* The caller must provide a path to a storage location within the user's
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* data directory.
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*
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* Function return: 0 on success
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*set_active_group)(struct fingerprint_device *dev, uint32_t gid,
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const char *store_path);
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/*
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* Authenticates an operation identifed by operation_id
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*
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* Function return: 0 on success
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* or a negative number in case of error, generally from the errno.h set.
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*/
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int (*authenticate)(struct fingerprint_device *dev, uint64_t operation_id, uint32_t gid);
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/* Reserved for backward binary compatibility */
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void *reserved[4];
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} fingerprint_device_t;
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typedef struct fingerprint_module {
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/**
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* Common methods of the fingerprint module. This *must* be the first member
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* of fingerprint_module as users of this structure will cast a hw_module_t
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* to fingerprint_module pointer in contexts where it's known
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* the hw_module_t references a fingerprint_module.
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*/
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struct hw_module_t common;
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} fingerprint_module_t;
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#endif /* ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H */
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