static int ipoctal_write(struct ipoctal *ipoctal, unsigned int channel, const unsigned char *buf, int count)
{
ipoctal->nb_bytes[channel] = 0;
ipoctal->count_wr[channel] = 0;
/* Copy the data to the write buffer */
ipoctal_copy_write_buffer(ipoctal, channel, buf, count);
ipoctal->error_flag[channel] = UART_NOERROR;
ipoctal->read_write[channel].error_flag = UART_NOERROR;
/* Using half-duplex on transmission */
ipoctal->chan_status[channel] = CHAN_WRITE;
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr, CR_DISABLE_RX);
if (ipoctal->board_id == IP_OCTAL_485_ID) {
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_ASSERT_RTSN);
}
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr, CR_ENABLE_TX);
wait_event_interruptible(ipoctal->queue[channel], ipoctal->write);
/* End Write operation */
ipoctal->write = 0;
ipoctal->chan_status[channel] = CHAN_READ;
if(ipoctal->board_id != IP_OCTAL_485_ID) {
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr, CR_DISABLE_TX);
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr, CR_ENABLE_RX);
}
return ipoctal->count_wr[channel];
}
static int ipoctal_write_tty(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct ipoctal_channel *channel = tty->driver_data;
unsigned int char_copied;
char_copied = ipoctal_copy_write_buffer(channel, buf, count);
/* As the IP-OCTAL 485 only supports half duplex, do it manually */
if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
channel->rx_enable = 0;
iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
}
/*
* Send a packet and then disable TX to avoid failure after several send
* operations
*/
iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
return char_copied;
}
