1 /* 2 * Copyright (C) 2021 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #ifndef HIDS_CLIENT_H 39 #define HIDS_CLIENT_H 40 41 #if defined __cplusplus 42 extern "C" { 43 #endif 44 45 #include <stdint.h> 46 #include "hid.h" 47 #include "btstack_defines.h" 48 #include "bluetooth.h" 49 #include "btstack_linked_list.h" 50 #include "ble/gatt_client.h" 51 52 #ifndef MAX_NUM_HID_SERVICES 53 #define MAX_NUM_HID_SERVICES 3 54 #endif 55 #define HIDS_CLIENT_INVALID_REPORT_INDEX 0xFF 56 57 #define HIDS_CLIENT_NUM_REPORTS 15 58 59 typedef enum { 60 HIDS_CLIENT_STATE_IDLE, 61 62 // get all HID services 63 HIDS_CLIENT_STATE_W2_QUERY_SERVICE, 64 HIDS_CLIENT_STATE_W4_SERVICE_RESULT, 65 66 // for each service, discover all characteristics 67 HIDS_CLIENT_STATE_W2_QUERY_CHARACTERISTIC, 68 HIDS_CLIENT_STATE_W4_CHARACTERISTIC_RESULT, 69 70 HIDS_CLIENT_STATE_W2_SET_BOOT_PROTOCOL_MODE, 71 72 // for each REPORT_MAP characteristic, read HID Descriptor (Report Map Characteristic Value) 73 HIDS_CLIENT_STATE_W2_READ_REPORT_MAP_HID_DESCRIPTOR, 74 HIDS_CLIENT_STATE_W4_REPORT_MAP_HID_DESCRIPTOR, 75 76 // for REPORT_MAP characteristic, discover descriptor 77 HIDS_CLIENT_STATE_W2_REPORT_MAP_DISCOVER_CHARACTERISTIC_DESCRIPTORS, 78 HIDS_CLIENT_STATE_W4_REPORT_MAP_CHARACTERISTIC_DESCRIPTORS_RESULT, 79 80 // for REPORT_MAP characteristic, read External Report Reference Characteristic Descriptor 81 HIDS_CLIENT_STATE_W2_REPORT_MAP_READ_EXTERNAL_REPORT_REFERENCE_UUID, 82 HIDS_CLIENT_STATE_W4_REPORT_MAP_EXTERNAL_REPORT_REFERENCE_UUID, 83 84 // for every external report reference uuid, discover external Report characteristic 85 HIDS_CLIENT_STATE_W2_DISCOVER_EXTERNAL_REPORT_CHARACTERISTIC, 86 HIDS_CLIENT_STATE_W4_EXTERNAL_REPORT_CHARACTERISTIC_RESULT, 87 88 // for each Report characteristics, discover Report characteristic descriptor 89 HIDS_CLIENT_STATE_W2_FIND_REPORT, 90 HIDS_CLIENT_STATE_W4_REPORT_FOUND, 91 92 // then read value of Report characteristic descriptor to get report ID and type 93 HIDS_CLIENT_STATE_W2_READ_REPORT_ID_AND_TYPE, 94 HIDS_CLIENT_STATE_W4_REPORT_ID_AND_TYPE, 95 96 HIDS_CLIENT_STATE_W2_ENABLE_INPUT_REPORTS, 97 HIDS_CLIENT_STATE_W4_INPUT_REPORTS_ENABLED, 98 99 HIDS_CLIENT_STATE_CONNECTED, 100 HIDS_CLIENT_W2_SEND_REPORT, 101 102 HIDS_CLIENT_W2_SEND_GET_REPORT, 103 HIDS_CLIENT_W4_GET_REPORT_RESULT, 104 105 HIDS_CLIENT_W2_READ_VALUE_OF_CHARACTERISTIC, 106 HIDS_CLIENT_W4_VALUE_OF_CHARACTERISTIC_RESULT, 107 108 #ifdef ENABLE_TESTING_SUPPORT 109 HIDS_CLIENT_W2_READ_CHARACTERISTIC_CONFIGURATION, 110 HIDS_CLIENT_W4_CHARACTERISTIC_CONFIGURATION_RESULT, 111 #endif 112 113 } hid_service_client_state_t; 114 115 116 typedef struct { 117 // GATT cache 118 119 //reuse as descriptor_handle 120 uint16_t value_handle; 121 uint16_t end_handle; 122 uint16_t properties; 123 124 // UUID of external Report characteristic, stored in Report Map descriptor EXTERNAL_REPORT_REFERENCE 125 uint16_t external_report_reference_uuid; 126 127 #ifdef ENABLE_TESTING_SUPPORT 128 uint16_t ccc_handle; 129 #endif 130 131 // service mapping 132 uint8_t service_index; 133 uint8_t report_id; 134 hid_report_type_t report_type; 135 uint8_t boot_report; 136 gatt_client_notification_t notification_listener; 137 } hids_client_report_t; 138 139 typedef struct { 140 uint16_t start_handle; 141 uint16_t end_handle; 142 143 uint16_t report_map_value_handle; 144 uint16_t report_map_end_handle; 145 146 uint16_t hid_information_value_handle; 147 uint16_t control_point_value_handle; 148 uint16_t protocol_mode_value_handle; 149 150 // descriptor storage 151 uint16_t hid_descriptor_offset; 152 uint16_t hid_descriptor_len; 153 uint16_t hid_descriptor_max_len; 154 uint8_t hid_descriptor_status; // ERROR_CODE_SUCCESS if descriptor available, 155 // ERROR_CODE_UNSUPPORTED_FEATURE_OR_PARAMETER_VALUE if not, and 156 // ERROR_CODE_MEMORY_CAPACITY_EXCEEDED if descriptor is larger then the available space 157 } hid_service_t; 158 159 typedef struct { 160 btstack_linked_item_t item; 161 162 hci_con_handle_t con_handle; 163 uint16_t cid; 164 hid_protocol_mode_t protocol_mode; 165 hid_service_client_state_t state; 166 btstack_packet_handler_t client_handler; 167 168 uint8_t num_instances; 169 hid_service_t services[MAX_NUM_HID_SERVICES]; 170 171 // used for discovering characteristics 172 uint8_t service_index; 173 hid_protocol_mode_t required_protocol_mode; 174 175 uint16_t protocol_mode_value_handle; 176 177 // send report 178 hids_client_report_t reports[HIDS_CLIENT_NUM_REPORTS]; 179 uint8_t num_reports; 180 181 hids_client_report_t external_reports[HIDS_CLIENT_NUM_REPORTS]; 182 uint8_t num_external_reports; 183 184 // index used for report and report map search 185 uint8_t report_index; 186 uint16_t handle; 187 uint16_t report_len; 188 const uint8_t * report; 189 190 } hids_client_t; 191 192 /* API_START */ 193 194 /** 195 * @brief Initialize Battery Service. 196 * @param hid_descriptor_storage 197 * @param hid_descriptor_storage_len 198 */ 199 void hids_client_init(uint8_t * hid_descriptor_storage, uint16_t hid_descriptor_storage_len); 200 201 /* @brief Connect to HID Services of remote device. 202 * 203 * @param con_handle 204 * @param packet_handler 205 * @param protocol_mode see hid_protocol_mode_t in hid.h 206 * @param hids_cid 207 * @return status ERROR_CODE_SUCCESS on success, otherwise ERROR_CODE_COMMAND_DISALLOWED if there is already a client associated with con_handle, or BTSTACK_MEMORY_ALLOC_FAILED 208 */ 209 uint8_t hids_client_connect(hci_con_handle_t con_handle, btstack_packet_handler_t packet_handler, hid_protocol_mode_t protocol_mode, uint16_t * hids_cid); 210 211 /** 212 * @brief Send HID output report. 213 * @param hids_cid 214 * @param report_id 215 * @param report 216 * @param report_len 217 * @result status ERROR_CODE_SUCCESS on success, otherwise ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER, ERROR_CODE_COMMAND_DISALLOWED 218 */ 219 uint8_t hids_client_send_report(uint16_t hids_cid, uint8_t report_id, const uint8_t * report, uint8_t report_len); 220 221 uint8_t hids_client_send_get_report(uint16_t hids_cid, uint8_t report_id); 222 223 uint8_t hids_client_get_hid_information(uint16_t hids_cid, uint8_t service_index); 224 225 uint8_t hids_client_get_protocol_mode(uint16_t hids_cid, uint8_t service_index); 226 227 /** 228 * @brief Disconnect from Battery Service. 229 * @param hids_cid 230 * @return status 231 */ 232 uint8_t hids_client_disconnect(uint16_t hids_cid); 233 234 /* 235 * @brief Get descriptor data 236 * @param hid_cid 237 * @result data 238 */ 239 const uint8_t * hids_client_descriptor_storage_get_descriptor_data(uint16_t hids_cid, uint8_t service_index); 240 241 /* 242 * @brief Get descriptor length 243 * @param hid_cid 244 * @result length 245 */ 246 uint16_t hids_client_descriptor_storage_get_descriptor_len(uint16_t hids_cid, uint8_t service_index); 247 248 /** 249 * @brief De-initialize Battery Service. 250 */ 251 void hids_client_deinit(void); 252 253 /* API_END */ 254 255 #if defined __cplusplus 256 } 257 #endif 258 259 #endif 260