/*
* User Mode Init manager - For TI shared transport
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program;if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <poll.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <unistd.h>
#include <time.h>
#include "uim.h"
/* Maintains the exit state of UIM*/
static int exiting;
static int line_discipline;
static int dev_fd;
/* BD address as string and a pointer to array of hex bytes */
char uim_bd_address[BD_ADDR_LEN];
bdaddr_t *bd_addr;
/* kim Sysfs path */
static char *sysfs_install_entry = INSTALL_SYSFS_ENTRY;
static char *sysfs_dev_name = DEV_NAME_SYSFS;
static char *sysfs_baud_rate = BAUD_RATE_SYSFS;
static char *sysfs_flow_ctrl = FLOW_CTRL_SYSFS;
/*****************************************************************************/
#ifdef UIM_DEBUG
/* Function to Read the firmware version
* module into the system. Currently used for
* debugging purpose, whenever the baud rate is changed
*/
void read_firmware_version(int dev_fd)
{
int index = 0;
char resp_buffer[20] = { 0 };
unsigned char buffer[] = { 0x01, 0x01, 0x10, 0x00 };
UIM_START_FUNC();
UIM_VER(" wrote %d bytes", (int)write(dev_fd, buffer, 4));
UIM_VER(" reading %d bytes", (int)read(dev_fd, resp_buffer, 15));
for (index = 0; index < 15; index++)
UIM_VER(" %x ", resp_buffer[index]);
printf("\n");
}
#endif
void sysfs_entry_fallback(void)
{
sysfs_install_entry = INSTALL_SYSFS_ENTRY_OLD;
sysfs_dev_name = DEV_NAME_SYSFS_OLD;
sysfs_baud_rate = BAUD_RATE_SYSFS_OLD;
sysfs_flow_ctrl = FLOW_CTRL_SYSFS_OLD;
}
/*****************************************************************************/
/* Function to read the HCI event from the given file descriptor
*
* This will parse the response received and returns error
* if the required response is not received
*/
int read_hci_event(int fd, unsigned char *buf, int size)
{
int remain, rd;
int count = 0;
int reading = 1;
int rd_retry_count = 0;
struct timespec tm = {0, 50*1000*1000};
UIM_START_FUNC();
UIM_VER(" read_hci_event");
if (size <= 0)
return -1;
/* The first byte identifies the packet type. For HCI event packets, it
* should be 0x04, so we read until we get to the 0x04. */
while (reading) {
rd = read(fd, buf, 1);
if (rd <= 0 && rd_retry_count++ < 4) {
nanosleep(&tm, NULL);
continue;
} else if (rd_retry_count >= 4) {
return -1;
}
if (buf[0] == RESP_PREFIX) {
break;
}
}
count++;
/* The next two bytes are the event code and parameter total length. */
while (count < 3) {
rd = read(fd, buf + count, 3 - count);
if (rd <= 0)
return -1;
count += rd;
}
/* Now we read the parameters. */
if (buf[2] < (size - 3))
remain = buf[2];
else
remain = size - 3;
while ((count - 3) < remain) {
rd = read(fd, buf + count, remain - (count - 3));
if (rd <= 0)
return -1;
count += rd;
}
return count;
}
/* Function to read the Command complete event
*
* This will read the response for the change speed
* command that was sent to configure the UART speed
* with the custom baud rate
*/
static int read_command_complete(int fd, unsigned short opcode)
{
command_complete_t resp;
UIM_START_FUNC();
UIM_VER(" Command complete started");
if (read_hci_event(fd, (unsigned char *)&resp, sizeof(resp)) < 0) {
UIM_ERR("Invalid response");
return -1;
}
/* Response should be an event packet */
if (resp.uart_prefix != HCI_EVENT_PKT) {
UIM_ERR ("Error in response: not an event packet, 0x%02x!",
resp.uart_prefix);
return -1;
}
/* Response should be a command complete event */
if (resp.hci_hdr.evt != EVT_CMD_COMPLETE) {
/* event must be event-complete */
UIM_ERR("Error in response: not a cmd-complete event,0x%02x!",
resp.hci_hdr.evt);
return -1;
}
if (resp.hci_hdr.plen < 4) {
/* plen >= 4 for EVT_CMD_COMPLETE */
UIM_ERR("Error in response: plen is not >= 4, but 0x%02x!",
resp.hci_hdr.plen);
return -1;
}
if (resp.cmd_complete.opcode != (unsigned short)opcode) {
UIM_ERR("Error in response: opcode is 0x%04x, not 0x%04x!",
resp.cmd_complete.opcode, opcode);
return -1;
}
UIM_DBG("Command complete done");
return resp.status == 0 ? 0 : -1;
}
/* Function to set the default baud rate
*
* The default baud rate of 115200 is set to the UART from the host side
* by making a call to this function.This function is also called before
* making a call to set the custom baud rate
*/
static int set_baud_rate(int dev_fd)
{
UIM_START_FUNC();
struct termios ti;
tcflush(dev_fd, TCIOFLUSH);
/* Get the attributes of UART */
if (tcgetattr(dev_fd, &ti) < 0) {
UIM_ERR(" Can't get port settings");
return -1;
}
/* Change the UART attributes before
* setting the default baud rate*/
cfmakeraw(&ti);
ti.c_cflag |= 1;
ti.c_cflag |= CRTSCTS;
/* Set the attributes of UART after making
* the above changes
*/
tcsetattr(dev_fd, TCSANOW, &ti);
/* Set the actual default baud rate */
cfsetospeed(&ti, B115200);
cfsetispeed(&ti, B115200);
tcsetattr(dev_fd, TCSANOW, &ti);
tcflush(dev_fd, TCIOFLUSH);
UIM_DBG("set_baud_rate() done");
return 0;
}
/* Function to set the UART custom baud rate.
*
* The UART baud rate has already been
* set to default value 115200 before calling this function.
* The baud rate is then changed to custom baud rate by this function*/
static int set_custom_baud_rate(int dev_fd, int baud_rate, int flow_ctrl)
{
UIM_START_FUNC();
struct termios ti;
struct termios2 ti2;
tcflush(dev_fd, TCIOFLUSH);
/* Get the attributes of UART */
if (tcgetattr(dev_fd, &ti) < 0) {
UIM_ERR(" Can't get port settings");
return -1;
}
/*Set the UART flow control */
if (flow_ctrl)
ti.c_cflag |= CRTSCTS;
else
ti.c_cflag &= ~CRTSCTS;
/*
* Set the parameters associated with the UART
* The change will occur immediately by using TCSANOW
*/
if (tcsetattr(dev_fd, TCSANOW, &ti) < 0) {
UIM_ERR(" Can't set port settings");
return -1;
}
tcflush(dev_fd, TCIOFLUSH);
/*Set the actual baud rate */
ioctl(dev_fd, TCGETS2, &ti2);
ti2.c_cflag &= ~CBAUD;
ti2.c_cflag |= BOTHER;
ti2.c_ospeed = baud_rate;
ioctl(dev_fd, TCSETS2, &ti2);
return 0;
}
/* Function to configure the UART
* on receiving a notification from the ST KIM driver to install the line
* discipline, this function does UART configuration necessary for the STK
*/
int st_uart_config(unsigned char install)
{
int ldisc, len, fd, flow_ctrl;
unsigned char buf[UART_DEV_NAME_LEN];
uim_speed_change_cmd cmd;
char uart_dev_name[UART_DEV_NAME_LEN];
unsigned int cust_baud_rate;
uim_bdaddr_change_cmd addr_cmd;
UIM_START_FUNC();
if (install == '1') {
memset(buf, 0, UART_DEV_NAME_LEN);
fd = open(sysfs_dev_name, O_RDONLY);
if (fd < 0) {
UIM_ERR("Can't open %s", sysfs_dev_name);
return -1;
}
len = read(fd, buf, UART_DEV_NAME_LEN);
if (len < 0) {
UIM_ERR("read err (%s)", strerror(errno));
close(fd);
return len;
}
sscanf((const char*)buf, "%s", uart_dev_name);
close(fd);
memset(buf, 0, UART_DEV_NAME_LEN);
fd = open(sysfs_baud_rate, O_RDONLY);
if (fd < 0) {
UIM_ERR("Can't open %s", sysfs_baud_rate);
return -1;
}
len = read(fd, buf, UART_DEV_NAME_LEN);
if (len < 0) {
UIM_ERR("read err (%s)", strerror(errno));
close(fd);
return len;
}
close(fd);
sscanf((const char*)buf, "%d", &cust_baud_rate);
memset(buf, 0, UART_DEV_NAME_LEN);
fd = open(sysfs_flow_ctrl, O_RDONLY);
if (fd < 0) {
UIM_ERR("Can't open %s", sysfs_flow_ctrl);
close(fd);
return -1;
}
len = read(fd, buf, UART_DEV_NAME_LEN);
if (len < 0) {
UIM_ERR("read err (%s)", strerror(errno));
close(fd);
return len;
}
close(fd);
sscanf((const char*)buf, "%d", &flow_ctrl);
UIM_VER(" signal received, opening %s", uart_dev_name);
dev_fd = open(uart_dev_name, O_RDWR);
if (dev_fd < 0) {
UIM_ERR("Can't open %s", uart_dev_name);
return -1;
}
/*
* Set only the default baud rate.
* This will set the baud rate to default 115200
*/
if (set_baud_rate(dev_fd) < 0) {
UIM_ERR("set_baudrate() failed");
close(dev_fd);
return -1;
}
fcntl(dev_fd, F_SETFL,fcntl(dev_fd, F_GETFL) | O_NONBLOCK);
/* Set only the custom baud rate */
if (cust_baud_rate != 115200) {
UIM_VER("Setting speed to %d", cust_baud_rate);
/* Forming the packet for Change speed command */
cmd.uart_prefix = HCI_COMMAND_PKT;
cmd.hci_hdr.opcode = HCI_HDR_OPCODE;
cmd.hci_hdr.plen = sizeof(unsigned int);
cmd.speed = cust_baud_rate;
/* Writing the change speed command to the UART
* This will change the UART speed at the controller
* side
*/
len = write(dev_fd, &cmd, sizeof(cmd));
if (len < 0) {
UIM_ERR("Failed to write speed-set command");
close(dev_fd);
return -1;
}
/* Read the response for the Change speed command */
if (read_command_complete(dev_fd, HCI_HDR_OPCODE) < 0) {
close(dev_fd);
return -1;
}
UIM_VER("Speed changing to %d, %d", cust_baud_rate, flow_ctrl);
/* Set the actual custom baud rate at the host side */
if (set_custom_baud_rate(dev_fd, cust_baud_rate, flow_ctrl) < 0) {
UIM_ERR("set_custom_baud_rate() failed");
close(dev_fd);
return -1;
}
/* Set the uim BD address */
if (uim_bd_address[0] != 0) {
memset(&addr_cmd, 0, sizeof(addr_cmd));
/* Forming the packet for change BD address command*/
addr_cmd.uart_prefix = HCI_COMMAND_PKT;
addr_cmd.hci_hdr.opcode = WRITE_BD_ADDR_OPCODE;
addr_cmd.hci_hdr.plen = sizeof(bdaddr_t);
memcpy(&addr_cmd.addr, bd_addr, sizeof(bdaddr_t));
/* Writing the change BD address command to the UART
* This will change the change BD address at the controller
* side
*/
len = write(dev_fd, &addr_cmd, sizeof(addr_cmd));
if (len < 0) {
UIM_ERR("Failed to write BD address command");
close(dev_fd);
return -1;
}
/* Read the response for the change BD address command */
if (read_command_complete(dev_fd, WRITE_BD_ADDR_OPCODE) < 0) {
close(dev_fd);
return -1;
}
UIM_VER("BD address changed to %s", uim_bd_address);
}
#ifdef UIM_DEBUG
read_firmware_version(dev_fd);
#endif
}
/* After the UART speed has been changed, the IOCTL is
* is called to set the line discipline to N_TI_WL
*/
ldisc = N_TI_WL;
if (ioctl(dev_fd, TIOCSETD, &ldisc) < 0) {
UIM_ERR(" Can't set line discipline");
close(dev_fd);
return -1;
}
UIM_DBG("Installed N_TI_WL Line displine");
}
else {
UIM_DBG("Un-Installed N_TI_WL Line displine");
/* UNINSTALL_N_TI_WL - When the Signal is received from KIM */
/* closing UART fd */
close(dev_fd);
}
return 0;
}
/* Function to convert the BD address from ascii to hex value */
bdaddr_t *strtoba(const char *str)
{
const char *ptr = str;
int i;
uint8_t *ba = malloc(sizeof(bdaddr_t));
if (!ba)
return NULL;
for (i = 0; i < 6; i++) {
ba[i] = (uint8_t) strtol(ptr, NULL, 16);
if (i != 5 && !(ptr = strchr(ptr, ':')))
ptr = ":00:00:00:00:00";
ptr++;
}
return (bdaddr_t *) ba;
}
/*****************************************************************************/
int main(int argc, char *argv[])
{
int st_fd, err,trials;
unsigned char install;
struct pollfd p;
UIM_START_FUNC();
err = 0;
trials = 5;
/* Parse the user input */
if ((argc > 2)) {
UIM_ERR("Invalid arguements");
UIM_ERR("Usage: uim <bd address>");
return -1;
}
if (argc == 2) {
if (strlen(argv[2]) != BD_ADDR_LEN) {
UIM_ERR("Usage: uim XX:XX:XX:XX:XX:XX");
return -1;
}
/* BD address passed as string in xx:xx:xx:xx:xx:xx format */
strncpy(uim_bd_address, argv[2], sizeof(uim_bd_address));
bd_addr = strtoba(uim_bd_address);
}
line_discipline = N_TI_WL;
/* sysfs entry may get populated after service is started so we retry if it fails*/
while (trials > 0) {
st_fd = open(sysfs_install_entry, O_RDONLY);
if(st_fd > 0)
break;
if (trials == 3)
sysfs_entry_fallback();
else
usleep(500000);
--trials;
}
if (st_fd < 0) {
UIM_DBG("unable to open %s(%s)", sysfs_install_entry, strerror(errno));
return -1;
}
RE_POLL:
/* read to start proper poll */
err = read(st_fd, &install, 1);
/* special case where bluetoothd starts before the UIM, and UIM
* needs to turn on bluetooth because of that.
*/
if ((err > 0) && install == '1') {
UIM_DBG("install set previously...");
st_uart_config(install);
}
UIM_DBG("begin polling...");
memset(&p, 0, sizeof(p));
p.fd = st_fd;
p.events = POLLERR | POLLPRI;
while (!exiting) {
p.revents = 0;
err = poll(&p, 1, -1);
UIM_DBG("poll broke due to event %d(PRI:%d/ERR:%d)\n", p.revents, POLLPRI, POLLERR);
if (err < 0 && errno == EINTR)
continue;
if (err)
break;
}
close(st_fd);
st_fd = open(sysfs_install_entry, O_RDONLY);
if (st_fd < 0) {
UIM_DBG("unable to open %s (%s)", sysfs_install_entry, strerror(errno));
return -1;
}
if (!exiting)
{
err = read(st_fd, &install, 1);
UIM_DBG("read %c from install \n", install);
if (err > 0)
st_uart_config(install);
goto RE_POLL;
}
close(st_fd);
return 0;
}