Return-Path: From: Arman Uguray To: linux-bluetooth@vger.kernel.org Cc: Arman Uguray Subject: [PATCH BlueZ 05/11] shared/gatt-server: Implement "Read Blob" request. Date: Fri, 7 Nov 2014 00:09:45 -0800 Message-Id: <1415347791-11716-6-git-send-email-armansito@chromium.org> In-Reply-To: <1415347791-11716-1-git-send-email-armansito@chromium.org> References: <1415347791-11716-1-git-send-email-armansito@chromium.org> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: This patch implements the "Read Blob" request for the GATT server role. --- src/shared/gatt-server.c | 96 +++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 82 insertions(+), 14 deletions(-) diff --git a/src/shared/gatt-server.c b/src/shared/gatt-server.c index 5cf11a4..49da84e 100644 --- a/src/shared/gatt-server.c +++ b/src/shared/gatt-server.c @@ -68,6 +68,7 @@ struct bt_gatt_server { unsigned int write_id; unsigned int write_cmd_id; unsigned int read_id; + unsigned int read_blob_id; struct async_read_op *pending_read_op; struct async_write_op *pending_write_op; @@ -89,6 +90,7 @@ static void bt_gatt_server_free(struct bt_gatt_server *server) bt_att_unregister(server->att, server->write_id); bt_att_unregister(server->att, server->write_cmd_id); bt_att_unregister(server->att, server->read_id); + bt_att_unregister(server->att, server->read_blob_id); if (server->pending_read_op) server->pending_read_op->server = NULL; @@ -760,12 +762,36 @@ error: NULL, NULL, NULL); } +static uint8_t get_read_rsp_opcode(uint8_t opcode) +{ + + switch (opcode) { + case BT_ATT_OP_READ_REQ: + return BT_ATT_OP_READ_RSP; + case BT_ATT_OP_READ_BLOB_REQ: + return BT_ATT_OP_READ_BLOB_RSP; + default: + /* + * Should never happen + * + * TODO: It would be nice to have a debug-mode assert macro + * for development builds. This way bugs could be easily catched + * during development and there would be self documenting code + * that wouldn't be crash release builds. + */ + return 0; + } + + return 0; +} + static void read_complete_cb(struct gatt_db_attribute *attr, int err, const uint8_t *value, size_t len, void *user_data) { struct async_read_op *op = user_data; struct bt_gatt_server *server = op->server; + uint8_t rsp_opcode; uint16_t mtu; uint16_t handle; @@ -788,32 +814,24 @@ static void read_complete_cb(struct gatt_db_attribute *attr, int err, return; } - /* TODO: Send Read Blob response based on the request */ + rsp_opcode = get_read_rsp_opcode(op->opcode); - bt_att_send(server->att, BT_ATT_OP_READ_RSP, len ? value : NULL, + bt_att_send(server->att, rsp_opcode, len ? value : NULL, MIN((unsigned) mtu - 1, len), NULL, NULL, NULL); async_read_op_destroy(op); } -static void read_cb(uint8_t opcode, const void *pdu, - uint16_t length, void *user_data) +static void handle_read_req(struct bt_gatt_server *server, uint8_t opcode, + uint16_t handle, + uint16_t offset) { - struct bt_gatt_server *server = user_data; - uint16_t mtu = bt_att_get_mtu(server->att); uint8_t error_pdu[4]; - uint16_t handle = 0; struct gatt_db_attribute *attr; uint8_t ecode; uint32_t perm; struct async_read_op *op = NULL; - if (length != 2) { - ecode = BT_ATT_ERROR_INVALID_PDU; - goto error; - } - - handle = get_le16(pdu); attr = gatt_db_get_attribute(server->db, handle); if (!attr) { ecode = BT_ATT_ERROR_INVALID_HANDLE; @@ -848,7 +866,8 @@ static void read_cb(uint8_t opcode, const void *pdu, op->server = server; server->pending_read_op = op; - if (gatt_db_attribute_read(attr, 0, opcode, NULL, read_complete_cb, op)) + if (gatt_db_attribute_read(attr, offset, opcode, NULL, + read_complete_cb, op)) return; ecode = BT_ATT_ERROR_UNLIKELY; @@ -862,6 +881,47 @@ error: NULL); } +static void read_cb(uint8_t opcode, const void *pdu, + uint16_t length, void *user_data) +{ + struct bt_gatt_server *server = user_data; + uint16_t handle; + + if (length != 2) { + uint8_t pdu[4]; + + encode_error_rsp(opcode, 0, BT_ATT_ERROR_INVALID_PDU, pdu); + bt_att_send(server->att, BT_ATT_OP_ERROR_RSP, pdu, 4, NULL, + NULL, NULL); + return; + } + + handle = get_le16(pdu); + + handle_read_req(server, opcode, handle, 0); +} + +static void read_blob_cb(uint8_t opcode, const void *pdu, + uint16_t length, void *user_data) +{ + struct bt_gatt_server *server = user_data; + uint16_t handle, offset; + + if (length != 4) { + uint8_t pdu[4]; + + encode_error_rsp(opcode, 0, BT_ATT_ERROR_INVALID_PDU, pdu); + bt_att_send(server->att, BT_ATT_OP_ERROR_RSP, pdu, 4, NULL, + NULL, NULL); + return; + } + + handle = get_le16(pdu); + offset = get_le16(pdu + 2); + + handle_read_req(server, opcode, handle, offset); +} + static void exchange_mtu_cb(uint8_t opcode, const void *pdu, uint16_t length, void *user_data) { @@ -947,6 +1007,14 @@ static bool gatt_server_register_att_handlers(struct bt_gatt_server *server) if (!server->read_id) return false; + /* Read Blob Request */ + server->read_blob_id = bt_att_register(server->att, + BT_ATT_OP_READ_BLOB_REQ, + read_blob_cb, + server, NULL); + if (!server->read_blob_id) + return false; + return true; } -- 2.1.0.rc2.206.gedb03e5