USB: f81232: implement set_termios()
The original driver had do not any h/w change in driver. This patch implements with configure H/W for baud/parity/word length/stop bits functional in f81232_set_termios(). This patch also implement DTR/RTS control when baudrate B0. We drop DTR/RTS when B0, otherwise enable it. We are checking baudrate in set_termios() too, If baudrate larger then 115200, it will be changed to 115200 and use tty_encode_baud_rate() to encode into tty Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org>
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94f87309fb
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@ -31,14 +31,19 @@ static const struct usb_device_id id_table[] = {
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* Maximum baudrate for F81232 */
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#define F81232_MAX_BAUDRATE 115200
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/* USB Control EP parameter */
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#define F81232_REGISTER_REQUEST 0xa0
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#define F81232_GET_REGISTER 0xc0
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#define F81232_SET_REGISTER 0x40
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#define SERIAL_BASE_ADDRESS 0x0120
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#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
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#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
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#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
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#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
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#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
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#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
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@ -64,6 +69,11 @@ struct f81232_private {
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struct usb_serial_port *port;
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};
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static int calc_baud_divisor(speed_t baudrate)
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{
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return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
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}
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static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
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{
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int status;
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@ -350,6 +360,53 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
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*/
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}
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static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
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{
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u8 lcr;
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int divisor, status = 0;
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divisor = calc_baud_divisor(baudrate);
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status = f81232_get_register(port, LINE_CONTROL_REGISTER,
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&lcr); /* get LCR */
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if (status) {
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dev_err(&port->dev, "%s failed to get LCR: %d\n",
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__func__, status);
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return;
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}
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status = f81232_set_register(port, LINE_CONTROL_REGISTER,
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lcr | UART_LCR_DLAB); /* Enable DLAB */
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if (status) {
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dev_err(&port->dev, "%s failed to set DLAB: %d\n",
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__func__, status);
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return;
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}
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status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
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divisor & 0x00ff); /* low */
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if (status) {
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dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
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__func__, status);
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goto reapply_lcr;
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}
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status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
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(divisor & 0xff00) >> 8); /* high */
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if (status) {
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dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
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__func__, status);
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}
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reapply_lcr:
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status = f81232_set_register(port, LINE_CONTROL_REGISTER,
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lcr & ~UART_LCR_DLAB);
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if (status) {
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dev_err(&port->dev, "%s failed to set DLAB: %d\n",
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__func__, status);
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}
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}
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static int f81232_port_enable(struct usb_serial_port *port)
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{
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u8 val;
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@ -395,15 +452,62 @@ static int f81232_port_disable(struct usb_serial_port *port)
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static void f81232_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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/* FIXME - Stubbed out for now */
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u8 new_lcr = 0;
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int status = 0;
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speed_t baudrate;
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/* Don't change anything if nothing has changed */
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if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
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return;
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/* Do the real work here... */
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if (old_termios)
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tty_termios_copy_hw(&tty->termios, old_termios);
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if (C_BAUD(tty) == B0)
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f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
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else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
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f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
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baudrate = tty_get_baud_rate(tty);
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if (baudrate > 0) {
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if (baudrate > F81232_MAX_BAUDRATE) {
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baudrate = F81232_MAX_BAUDRATE;
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tty_encode_baud_rate(tty, baudrate, baudrate);
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}
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f81232_set_baudrate(port, baudrate);
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}
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if (C_PARENB(tty)) {
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new_lcr |= UART_LCR_PARITY;
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if (!C_PARODD(tty))
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new_lcr |= UART_LCR_EPAR;
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if (C_CMSPAR(tty))
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new_lcr |= UART_LCR_SPAR;
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}
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if (C_CSTOPB(tty))
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new_lcr |= UART_LCR_STOP;
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switch (C_CSIZE(tty)) {
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case CS5:
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new_lcr |= UART_LCR_WLEN5;
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break;
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case CS6:
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new_lcr |= UART_LCR_WLEN6;
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break;
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case CS7:
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new_lcr |= UART_LCR_WLEN7;
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break;
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default:
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case CS8:
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new_lcr |= UART_LCR_WLEN8;
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break;
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}
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status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
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if (status) {
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dev_err(&port->dev, "%s failed to set LCR: %d\n",
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__func__, status);
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}
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}
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static int f81232_tiocmget(struct tty_struct *tty)
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