USB: f81232: implement MCR/MSR function
This patch implement relative MCR/MSR function, such like tiocmget()/tiocmset()/dtr_rts()/carrier_raised() original f81232_carrier_raised() compared with wrong value UART_DCD. It's should compared with UART_MSR_DCD. Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org>
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@ -34,8 +34,10 @@ MODULE_DEVICE_TABLE(usb, id_table);
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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 MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
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#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
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#define CONTROL_DTR 0x01
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@ -54,7 +56,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
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struct f81232_private {
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struct mutex lock;
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u8 line_control;
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u8 modem_control;
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u8 modem_status;
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struct work_struct interrupt_work;
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struct usb_serial_port *port;
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@ -95,6 +97,42 @@ static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
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return status;
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}
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static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
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{
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int status;
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u8 *tmp;
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struct usb_device *dev = port->serial->dev;
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tmp = kmalloc(sizeof(val), GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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*tmp = val;
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status = usb_control_msg(dev,
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usb_sndctrlpipe(dev, 0),
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F81232_REGISTER_REQUEST,
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F81232_SET_REGISTER,
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reg,
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0,
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tmp,
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sizeof(val),
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USB_CTRL_SET_TIMEOUT);
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if (status != sizeof(val)) {
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dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
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if (status < 0)
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status = usb_translate_errors(status);
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else
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status = -EIO;
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} else {
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status = 0;
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}
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kfree(tmp);
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return status;
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}
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static void f81232_read_msr(struct usb_serial_port *port)
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{
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int status;
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@ -139,6 +177,51 @@ static void f81232_read_msr(struct usb_serial_port *port)
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mutex_unlock(&priv->lock);
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}
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static int f81232_set_mctrl(struct usb_serial_port *port,
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unsigned int set, unsigned int clear)
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{
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u8 val;
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int status;
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struct f81232_private *priv = usb_get_serial_port_data(port);
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if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
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return 0; /* no change */
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/* 'set' takes precedence over 'clear' */
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clear &= ~set;
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/* force enable interrupt with OUT2 */
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mutex_lock(&priv->lock);
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val = UART_MCR_OUT2 | priv->modem_control;
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if (clear & TIOCM_DTR)
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val &= ~UART_MCR_DTR;
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if (clear & TIOCM_RTS)
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val &= ~UART_MCR_RTS;
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if (set & TIOCM_DTR)
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val |= UART_MCR_DTR;
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if (set & TIOCM_RTS)
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val |= UART_MCR_RTS;
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dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
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val, priv->modem_control);
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status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
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if (status) {
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dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
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mutex_unlock(&priv->lock);
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return status;
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}
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priv->modem_control = val;
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mutex_unlock(&priv->lock);
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return 0;
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}
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static void f81232_update_line_status(struct usb_serial_port *port,
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unsigned char *data,
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size_t actual_length)
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@ -254,12 +337,6 @@ static void f81232_process_read_urb(struct urb *urb)
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tty_flip_buffer_push(&port->port);
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}
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static int set_control_lines(struct usb_device *dev, u8 value)
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{
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/* FIXME - Stubbed out for now */
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return 0;
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}
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static void f81232_break_ctl(struct tty_struct *tty, int break_state)
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{
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/* FIXME - Stubbed out for now */
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@ -287,15 +364,35 @@ static void f81232_set_termios(struct tty_struct *tty,
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static int f81232_tiocmget(struct tty_struct *tty)
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{
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/* FIXME - Stubbed out for now */
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return 0;
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int r;
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struct usb_serial_port *port = tty->driver_data;
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struct f81232_private *port_priv = usb_get_serial_port_data(port);
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u8 mcr, msr;
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/* force get current MSR changed state */
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f81232_read_msr(port);
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mutex_lock(&port_priv->lock);
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mcr = port_priv->modem_control;
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msr = port_priv->modem_status;
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mutex_unlock(&port_priv->lock);
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r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
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(mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
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(msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
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(msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
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(msr & UART_MSR_RI ? TIOCM_RI : 0) |
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(msr & UART_MSR_DSR ? TIOCM_DSR : 0);
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return r;
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}
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static int f81232_tiocmset(struct tty_struct *tty,
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unsigned int set, unsigned int clear)
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{
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/* FIXME - Stubbed out for now */
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return 0;
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struct usb_serial_port *port = tty->driver_data;
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return f81232_set_mctrl(port, set, clear);
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}
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static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
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@ -330,24 +427,22 @@ static void f81232_close(struct usb_serial_port *port)
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static void f81232_dtr_rts(struct usb_serial_port *port, int on)
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{
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struct f81232_private *priv = usb_get_serial_port_data(port);
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u8 control;
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mutex_lock(&priv->lock);
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/* Change DTR and RTS */
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if (on)
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priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
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f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
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else
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priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
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control = priv->line_control;
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mutex_unlock(&priv->lock);
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set_control_lines(port->serial->dev, control);
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f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
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}
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static int f81232_carrier_raised(struct usb_serial_port *port)
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{
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u8 msr;
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struct f81232_private *priv = usb_get_serial_port_data(port);
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if (priv->modem_status & UART_DCD)
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mutex_lock(&priv->lock);
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msr = priv->modem_status;
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mutex_unlock(&priv->lock);
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if (msr & UART_MSR_DCD)
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return 1;
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return 0;
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}
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