2 * Copyright (C) 2014 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H
18 #define ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H
20 #include <hardware/hw_auth_token.h>
22 #define FINGERPRINT_MODULE_API_VERSION_1_0 HARDWARE_MODULE_API_VERSION(1, 0)
23 #define FINGERPRINT_MODULE_API_VERSION_2_0 HARDWARE_MODULE_API_VERSION(2, 0)
24 #define FINGERPRINT_HARDWARE_MODULE_ID "fingerprint"
26 typedef enum fingerprint_msg_type {
27 FINGERPRINT_ERROR = -1,
28 FINGERPRINT_ACQUIRED = 1,
29 FINGERPRINT_TEMPLATE_ENROLLING = 3,
30 FINGERPRINT_TEMPLATE_REMOVED = 4,
31 FINGERPRINT_AUTHENTICATED = 5
32 } fingerprint_msg_type_t;
34 typedef enum fingerprint_error {
35 FINGERPRINT_ERROR_HW_UNAVAILABLE = 1,
36 FINGERPRINT_ERROR_UNABLE_TO_PROCESS = 2,
37 FINGERPRINT_ERROR_TIMEOUT = 3,
38 FINGERPRINT_ERROR_NO_SPACE = 4, /* No space available to store a template */
39 FINGERPRINT_ERROR_CANCELED = 5,
40 FINGERPRINT_ERROR_UNABLE_TO_REMOVE = 6, /* fingerprint id can't be removed */
41 FINGERPRINT_ERROR_VENDOR_BASE = 1000 /* vendor-specific error messages start here */
42 } fingerprint_error_t;
44 typedef enum fingerprint_acquired_info {
45 FINGERPRINT_ACQUIRED_GOOD = 0,
46 FINGERPRINT_ACQUIRED_PARTIAL = 1,
47 FINGERPRINT_ACQUIRED_INSUFFICIENT = 2,
48 FINGERPRINT_ACQUIRED_IMAGER_DIRTY = 3,
49 FINGERPRINT_ACQUIRED_TOO_SLOW = 4,
50 FINGERPRINT_ACQUIRED_TOO_FAST = 5,
51 FINGERPRINT_ACQUIRED_VENDOR_BASE = 1000 /* vendor-specific acquisition messages start here */
52 } fingerprint_acquired_info_t;
54 typedef struct fingerprint_finger_id {
57 } fingerprint_finger_id_t;
59 typedef struct fingerprint_enroll {
60 fingerprint_finger_id_t finger;
61 /* samples_remaining goes from N (no data collected, but N scans needed)
62 * to 0 (no more data is needed to build a template). */
63 uint32_t samples_remaining;
64 uint64_t msg; /* Vendor specific message. Used for user guidance */
65 } fingerprint_enroll_t;
67 typedef struct fingerprint_removed {
68 fingerprint_finger_id_t finger;
69 } fingerprint_removed_t;
71 typedef struct fingerprint_acquired {
72 fingerprint_acquired_info_t acquired_info; /* information about the image */
73 } fingerprint_acquired_t;
75 typedef struct fingerprint_authenticated {
76 fingerprint_finger_id_t finger;
78 } fingerprint_authenticated_t;
80 typedef struct fingerprint_msg {
81 fingerprint_msg_type_t type;
83 fingerprint_error_t error;
84 fingerprint_enroll_t enroll;
85 fingerprint_removed_t removed;
86 fingerprint_acquired_t acquired;
87 fingerprint_authenticated_t authenticated;
91 /* Callback function type */
92 typedef void (*fingerprint_notify_t)(const fingerprint_msg_t *msg);
94 /* Synchronous operation */
95 typedef struct fingerprint_device {
97 * Common methods of the fingerprint device. This *must* be the first member
98 * of fingerprint_device as users of this structure will cast a hw_device_t
99 * to fingerprint_device pointer in contexts where it's known
100 * the hw_device_t references a fingerprint_device.
102 struct hw_device_t common;
105 * Fingerprint enroll request:
106 * Switches the HAL state machine to collect and store a new fingerprint
107 * template. Switches back as soon as enroll is complete
108 * (fingerprint_msg.type == FINGERPRINT_TEMPLATE_ENROLLING &&
109 * fingerprint_msg.data.enroll.samples_remaining == 0)
110 * or after timeout_sec seconds.
111 * The fingerprint template will be assigned to the group gid. User has a choice
112 * to supply the gid or set it to 0 in which case a unique group id will be generated.
114 * Function return: 0 if enrollment process can be successfully started
115 * -1 otherwise. A notify() function may be called
116 * indicating the error condition.
118 int (*enroll)(struct fingerprint_device *dev, const hw_auth_token_t *hat,
119 uint32_t gid, uint32_t timeout_sec);
122 * Fingerprint pre-enroll enroll request:
123 * Generates a unique token to upper layers to indicate the start of an enrollment transaction.
124 * This token will be wrapped by security for verification and passed to enroll() for
125 * verification before enrollment will be allowed. This is to ensure adding a new fingerprint
126 * template was preceded by some kind of credential confirmation (e.g. device password).
128 * Function return: 0 if function failed
129 * otherwise, a uint64_t of token
131 uint64_t (*pre_enroll)(struct fingerprint_device *dev);
134 * get_authenticator_id:
135 * Returns a token associated with the current fingerprint set. This value will
136 * change whenever a new fingerprint is enrolled, thus creating a new fingerprint
139 * Function return: current authenticator id.
141 uint64_t (*get_authenticator_id)(struct fingerprint_device *dev);
144 * Cancel pending enroll or authenticate, sending FINGERPRINT_ERROR_CANCELED
145 * to all running clients. Switches the HAL state machine back to the idle state.
146 * will indicate switch back to the scan mode.
148 * Function return: 0 if cancel request is accepted
151 int (*cancel)(struct fingerprint_device *dev);
154 * Enumerate all the fingerprint templates found in the directory set by
156 * This is a synchronous call. The function takes:
157 * - A pointer to an array of fingerprint_finger_id_t.
158 * - The size of the array provided, in fingerprint_finger_id_t elements.
159 * Max_size is a bi-directional parameter and returns the actual number
160 * of elements copied to the caller supplied array.
161 * In the absence of errors the function returns the total number of templates
162 * in the user directory.
163 * If the caller has no good guess on the size of the array he should call this
164 * function witn *max_size == 0 and use the return value for the array allocation.
165 * The caller of this function has a complete list of the templates when *max_size
166 * is the same as the function return.
168 * Function return: Total number of fingerprint templates in the current
172 int (*enumerate)(struct fingerprint_device *dev, fingerprint_finger_id_t *results,
176 * Fingerprint remove request:
177 * Deletes a fingerprint template.
178 * Works only within a path set by set_active_group().
179 * notify() will be called with details on the template deleted.
180 * fingerprint_msg.type == FINGERPRINT_TEMPLATE_REMOVED and
181 * fingerprint_msg.data.removed.id indicating the template id removed.
183 * Function return: 0 if fingerprint template(s) can be successfully deleted
186 int (*remove)(struct fingerprint_device *dev, uint32_t gid, uint32_t fid);
189 * Restricts the HAL operation to a set of fingerprints belonging to a
191 * The caller must provide a path to a storage location within the user's
194 * Function return: 0 on success
195 * -1 if the group does not exist.
197 int (*set_active_group)(struct fingerprint_device *dev, uint32_t gid,
198 const char *store_path);
201 * Authenticates an operation identifed by operation_id
203 * Function return: 0 on success
204 * -1 if the operation cannot be completed
206 int (*authenticate)(struct fingerprint_device *dev, uint64_t operation_id, uint32_t gid);
209 * Set notification callback:
210 * Registers a user function that would receive notifications from the HAL
211 * The call will block if the HAL state machine is in busy state until HAL
212 * leaves the busy state.
214 * Function return: 0 if callback function is successfuly registered
217 int (*set_notify)(struct fingerprint_device *dev, fingerprint_notify_t notify);
220 * Client provided callback function to receive notifications.
221 * Do not set by hand, use the function above instead.
223 fingerprint_notify_t notify;
224 } fingerprint_device_t;
226 typedef struct fingerprint_module {
228 * Common methods of the fingerprint module. This *must* be the first member
229 * of fingerprint_module as users of this structure will cast a hw_module_t
230 * to fingerprint_module pointer in contexts where it's known
231 * the hw_module_t references a fingerprint_module.
233 struct hw_module_t common;
234 } fingerprint_module_t;
236 #endif /* ANDROID_INCLUDE_HARDWARE_FINGERPRINT_H */