| /****************************************************************************** |
| * |
| * Copyright (C) 2009-2012 Broadcom Corporation |
| * |
| * 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. |
| * |
| ******************************************************************************/ |
| |
| /****************************************************************************** |
| * |
| * Filename: userial.c |
| * |
| * Description: Contains open/read/write/close functions on serial port |
| * |
| ******************************************************************************/ |
| |
| #define LOG_TAG "bt_userial" |
| |
| #include <utils/Log.h> |
| #include <pthread.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <sys/socket.h> |
| #include "bt_hci_bdroid.h" |
| #include "userial.h" |
| #include "utils.h" |
| #include "bt_vendor_lib.h" |
| #include <sys/prctl.h> |
| |
| /****************************************************************************** |
| ** Constants & Macros |
| ******************************************************************************/ |
| |
| #ifndef USERIAL_DBG |
| #define USERIAL_DBG FALSE |
| #endif |
| |
| #if (USERIAL_DBG == TRUE) |
| #define USERIALDBG(param, ...) {ALOGD(param, ## __VA_ARGS__);} |
| #else |
| #define USERIALDBG(param, ...) {} |
| #endif |
| |
| #define MAX_SERIAL_PORT (USERIAL_PORT_3 + 1) |
| #define READ_LIMIT (BTHC_USERIAL_READ_MEM_SIZE - BT_HC_HDR_SIZE) |
| |
| enum { |
| USERIAL_RX_EXIT, |
| USERIAL_RX_FLOW_OFF, |
| USERIAL_RX_FLOW_ON |
| }; |
| |
| /****************************************************************************** |
| ** Externs |
| ******************************************************************************/ |
| |
| extern bt_vendor_interface_t *bt_vnd_if; |
| |
| /****************************************************************************** |
| ** Local type definitions |
| ******************************************************************************/ |
| |
| typedef struct |
| { |
| int fd; |
| uint8_t port; |
| pthread_t read_thread; |
| BUFFER_Q rx_q; |
| HC_BT_HDR *p_rx_hdr; |
| } tUSERIAL_CB; |
| |
| /****************************************************************************** |
| ** Static variables |
| ******************************************************************************/ |
| |
| static tUSERIAL_CB userial_cb; |
| static volatile uint8_t userial_running = 0; |
| |
| /****************************************************************************** |
| ** Static functions |
| ******************************************************************************/ |
| |
| /***************************************************************************** |
| ** Socket signal functions to wake up userial_read_thread for termination |
| ** |
| ** creating an unnamed pair of connected sockets |
| ** - signal_fds[0]: join fd_set in select call of userial_read_thread |
| ** - signal_fds[1]: trigger from userial_close |
| *****************************************************************************/ |
| static int signal_fds[2]={0,1}; |
| static uint8_t rx_flow_on = TRUE; |
| static inline int create_signal_fds(fd_set* set) |
| { |
| if(signal_fds[0]==0 && socketpair(AF_UNIX, SOCK_STREAM, 0, signal_fds)<0) |
| { |
| ALOGE("create_signal_sockets:socketpair failed, errno: %d", errno); |
| return -1; |
| } |
| FD_SET(signal_fds[0], set); |
| return signal_fds[0]; |
| } |
| static inline int send_wakeup_signal(char sig_cmd) |
| { |
| return send(signal_fds[1], &sig_cmd, sizeof(sig_cmd), 0); |
| } |
| static inline char reset_signal() |
| { |
| char sig_recv = -1; |
| recv(signal_fds[0], &sig_recv, sizeof(sig_recv), MSG_WAITALL); |
| return sig_recv; |
| } |
| static inline int is_signaled(fd_set* set) |
| { |
| return FD_ISSET(signal_fds[0], set); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function select_read |
| ** |
| ** Description check if fd is ready for reading and listen for termination |
| ** signal. need to use select in order to avoid collision |
| ** between read and close on the same fd |
| ** |
| ** Returns -1: termination |
| ** >=0: numbers of bytes read back from fd |
| ** |
| *******************************************************************************/ |
| static int select_read(int fd, uint8_t *pbuf, int len) |
| { |
| fd_set input; |
| int n = 0, ret = -1; |
| char reason = 0; |
| |
| while (userial_running) |
| { |
| /* Initialize the input fd set */ |
| FD_ZERO(&input); |
| if (rx_flow_on == TRUE) |
| { |
| FD_SET(fd, &input); |
| } |
| int fd_max = create_signal_fds(&input); |
| fd_max = fd_max > fd ? fd_max : fd; |
| |
| /* Do the select */ |
| n = select(fd_max+1, &input, NULL, NULL, NULL); |
| if(is_signaled(&input)) |
| { |
| reason = reset_signal(); |
| if (reason == USERIAL_RX_EXIT) |
| { |
| USERIALDBG("RX termination"); |
| return -1; |
| } |
| else if (reason == USERIAL_RX_FLOW_OFF) |
| { |
| USERIALDBG("RX flow OFF"); |
| rx_flow_on = FALSE; |
| } |
| else if (reason == USERIAL_RX_FLOW_ON) |
| { |
| USERIALDBG("RX flow ON"); |
| rx_flow_on = TRUE; |
| } |
| } |
| |
| if (n > 0) |
| { |
| /* We might have input */ |
| if (FD_ISSET(fd, &input)) |
| { |
| ret = read(fd, pbuf, (size_t)len); |
| if (0 == ret) |
| ALOGW( "read() returned 0!" ); |
| |
| return ret; |
| } |
| } |
| else if (n < 0) |
| ALOGW( "select() Failed"); |
| else if (n == 0) |
| ALOGW( "Got a select() TIMEOUT"); |
| |
| } |
| |
| return ret; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_read_thread |
| ** |
| ** Description |
| ** |
| ** Returns void * |
| ** |
| *******************************************************************************/ |
| static void *userial_read_thread(void *arg) |
| { |
| int rx_length = 0; |
| HC_BT_HDR *p_buf = NULL; |
| uint8_t *p; |
| |
| USERIALDBG("Entering userial_read_thread()"); |
| prctl(PR_SET_NAME, (unsigned long)"userial_read", 0, 0, 0); |
| |
| rx_flow_on = TRUE; |
| userial_running = 1; |
| |
| while (userial_running) |
| { |
| if (bt_hc_cbacks) |
| { |
| p_buf = (HC_BT_HDR *) bt_hc_cbacks->alloc( \ |
| BTHC_USERIAL_READ_MEM_SIZE); |
| } |
| else |
| p_buf = NULL; |
| |
| if (p_buf != NULL) |
| { |
| p_buf->offset = 0; |
| p_buf->layer_specific = 0; |
| |
| p = (uint8_t *) (p_buf + 1); |
| rx_length = select_read(userial_cb.fd, p, READ_LIMIT); |
| } |
| else |
| { |
| rx_length = 0; |
| utils_delay(100); |
| ALOGW("userial_read_thread() failed to gain buffers"); |
| continue; |
| } |
| |
| |
| if (rx_length > 0) |
| { |
| p_buf->len = (uint16_t)rx_length; |
| utils_enqueue(&(userial_cb.rx_q), p_buf); |
| bthc_signal_event(HC_EVENT_RX); |
| } |
| else /* either 0 or < 0 */ |
| { |
| ALOGW("select_read return size <=0:%d, exiting userial_read_thread",\ |
| rx_length); |
| /* if we get here, we should have a buffer */ |
| bt_hc_cbacks->dealloc((TRANSAC) p_buf, (char *) (p_buf + 1)); |
| /* negative value means exit thread */ |
| break; |
| } |
| } /* for */ |
| |
| userial_running = 0; |
| USERIALDBG("Leaving userial_read_thread()"); |
| pthread_exit(NULL); |
| |
| return NULL; // Compiler friendly |
| } |
| |
| |
| /***************************************************************************** |
| ** Userial API Functions |
| *****************************************************************************/ |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_init |
| ** |
| ** Description Initializes the userial driver |
| ** |
| ** Returns TRUE/FALSE |
| ** |
| *******************************************************************************/ |
| uint8_t userial_init(void) |
| { |
| USERIALDBG("userial_init"); |
| memset(&userial_cb, 0, sizeof(tUSERIAL_CB)); |
| userial_cb.fd = -1; |
| utils_queue_init(&(userial_cb.rx_q)); |
| return TRUE; |
| } |
| |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_open |
| ** |
| ** Description Open Bluetooth device with the port ID |
| ** |
| ** Returns TRUE/FALSE |
| ** |
| *******************************************************************************/ |
| uint8_t userial_open(uint8_t port) |
| { |
| struct sched_param param; |
| int policy, result; |
| pthread_attr_t thread_attr; |
| int fd_array[CH_MAX]; |
| |
| USERIALDBG("userial_open(port:%d)", port); |
| |
| if (userial_running) |
| { |
| /* Userial is open; close it first */ |
| userial_close(); |
| utils_delay(50); |
| } |
| |
| if (port >= MAX_SERIAL_PORT) |
| { |
| ALOGE("Port > MAX_SERIAL_PORT"); |
| return FALSE; |
| } |
| |
| /* Calling vendor-specific part */ |
| if (bt_vnd_if) |
| { |
| result = bt_vnd_if->op(BT_VND_OP_USERIAL_OPEN, &fd_array); |
| |
| if (result != 1) |
| { |
| ALOGE("userial_open: wrong numbers of open fd in vendor lib [%d]!", |
| result); |
| ALOGE("userial_open: HCI UART expects only one open fd"); |
| bt_vnd_if->op(BT_VND_OP_USERIAL_CLOSE, NULL); |
| return FALSE; |
| } |
| |
| userial_cb.fd = fd_array[0]; |
| } |
| else |
| { |
| ALOGE("userial_open: missing vendor lib interface !!!"); |
| ALOGE("userial_open: unable to open UART port"); |
| return FALSE; |
| } |
| |
| if (userial_cb.fd == -1) |
| { |
| ALOGE("userial_open: failed to open UART port"); |
| return FALSE; |
| } |
| |
| USERIALDBG( "fd = %d", userial_cb.fd); |
| |
| userial_cb.port = port; |
| |
| pthread_attr_init(&thread_attr); |
| |
| if (pthread_create(&(userial_cb.read_thread), &thread_attr, \ |
| userial_read_thread, NULL) != 0 ) |
| { |
| ALOGE("pthread_create failed!"); |
| return FALSE; |
| } |
| |
| if(pthread_getschedparam(userial_cb.read_thread, &policy, ¶m)==0) |
| { |
| policy = BTHC_LINUX_BASE_POLICY; |
| #if (BTHC_LINUX_BASE_POLICY!=SCHED_NORMAL) |
| param.sched_priority = BTHC_USERIAL_READ_THREAD_PRIORITY; |
| #endif |
| result = pthread_setschedparam(userial_cb.read_thread, policy, ¶m); |
| if (result != 0) |
| { |
| ALOGW("userial_open: pthread_setschedparam failed (%s)", \ |
| strerror(result)); |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_read |
| ** |
| ** Description Read data from the userial port |
| ** |
| ** Returns Number of bytes actually read from the userial port and |
| ** copied into p_data. This may be less than len. |
| ** |
| *******************************************************************************/ |
| uint16_t userial_read(uint16_t msg_id, uint8_t *p_buffer, uint16_t len) |
| { |
| uint16_t total_len = 0; |
| uint16_t copy_len = 0; |
| uint8_t *p_data = NULL; |
| |
| do |
| { |
| if(userial_cb.p_rx_hdr != NULL) |
| { |
| p_data = ((uint8_t *)(userial_cb.p_rx_hdr + 1)) + \ |
| (userial_cb.p_rx_hdr->offset); |
| |
| if((userial_cb.p_rx_hdr->len) <= (len - total_len)) |
| copy_len = userial_cb.p_rx_hdr->len; |
| else |
| copy_len = (len - total_len); |
| |
| memcpy((p_buffer + total_len), p_data, copy_len); |
| |
| total_len += copy_len; |
| |
| userial_cb.p_rx_hdr->offset += copy_len; |
| userial_cb.p_rx_hdr->len -= copy_len; |
| |
| if(userial_cb.p_rx_hdr->len == 0) |
| { |
| if (bt_hc_cbacks) |
| bt_hc_cbacks->dealloc((TRANSAC) userial_cb.p_rx_hdr, \ |
| (char *) (userial_cb.p_rx_hdr+1)); |
| |
| userial_cb.p_rx_hdr = NULL; |
| } |
| } |
| |
| if(userial_cb.p_rx_hdr == NULL) |
| { |
| userial_cb.p_rx_hdr=(HC_BT_HDR *)utils_dequeue(&(userial_cb.rx_q)); |
| } |
| } while ((userial_cb.p_rx_hdr != NULL) && (total_len < len)); |
| |
| return total_len; |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_write |
| ** |
| ** Description Write data to the userial port |
| ** |
| ** Returns Number of bytes actually written to the userial port. This |
| ** may be less than len. |
| ** |
| *******************************************************************************/ |
| uint16_t userial_write(uint16_t msg_id, uint8_t *p_data, uint16_t len) |
| { |
| int ret, total = 0; |
| |
| while(len != 0) |
| { |
| ret = write(userial_cb.fd, p_data+total, len); |
| total += ret; |
| len -= ret; |
| } |
| |
| return ((uint16_t)total); |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_close |
| ** |
| ** Description Close the userial port |
| ** |
| ** Returns None |
| ** |
| *******************************************************************************/ |
| void userial_close(void) |
| { |
| int result; |
| TRANSAC p_buf; |
| |
| USERIALDBG("userial_close(fd:%d)", userial_cb.fd); |
| |
| if (userial_running) |
| send_wakeup_signal(USERIAL_RX_EXIT); |
| |
| if ((result=pthread_join(userial_cb.read_thread, NULL)) < 0) |
| ALOGE( "pthread_join() FAILED result:%d", result); |
| |
| /* Calling vendor-specific part */ |
| if (bt_vnd_if) |
| bt_vnd_if->op(BT_VND_OP_USERIAL_CLOSE, NULL); |
| |
| userial_cb.fd = -1; |
| |
| if (bt_hc_cbacks) |
| { |
| while ((p_buf = utils_dequeue (&(userial_cb.rx_q))) != NULL) |
| { |
| bt_hc_cbacks->dealloc(p_buf, (char *) ((HC_BT_HDR *)p_buf+1)); |
| } |
| } |
| } |
| |
| /******************************************************************************* |
| ** |
| ** Function userial_ioctl |
| ** |
| ** Description ioctl inteface |
| ** |
| ** Returns None |
| ** |
| *******************************************************************************/ |
| void userial_ioctl(userial_ioctl_op_t op, void *p_data) |
| { |
| switch(op) |
| { |
| case USERIAL_OP_RXFLOW_ON: |
| if (userial_running) |
| send_wakeup_signal(USERIAL_RX_FLOW_ON); |
| break; |
| |
| case USERIAL_OP_RXFLOW_OFF: |
| if (userial_running) |
| send_wakeup_signal(USERIAL_RX_FLOW_OFF); |
| break; |
| |
| case USERIAL_OP_INIT: |
| default: |
| break; |
| } |
| } |
| |
