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Subject[PATCH v4 6/7] usb: serial: implement MCR/MSR function for F81232
Date
This patch implement relative MCR/MSR function, such like
tiocmget()/tiocmset()/dtr_rts().

The update_mctrl() replace set_control_lines() to do MCR control
so we clean-up the set_control_lines() function.

Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
---
drivers/usb/serial/f81232.c | 105 ++++++++++++++++++++++++++++++++++----------
1 file changed, 83 insertions(+), 22 deletions(-)

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 248f40d..0ed7e36 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -38,11 +38,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define UART_STATE_TRANSIENT_MASK 0x74
#define UART_DCD 0x01
#define UART_DSR 0x02
-#define UART_BREAK_ERROR 0x04
#define UART_RING 0x08
-#define UART_FRAME_ERROR 0x10
-#define UART_PARITY_ERROR 0x20
-#define UART_OVERRUN_ERROR 0x40
#define UART_CTS 0x80

#define REGISTER_REQUEST 0xA0
@@ -55,6 +51,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
+#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
struct f81232_private {
spinlock_t lock;
@@ -165,6 +162,62 @@ static void f81232_read_msr(struct f81232_private *priv)

dev_dbg(&dev->dev, "%s: %x\n", __func__, priv->line_status);
}
+
+static inline int update_mctrl(struct f81232_private *port_priv,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_device *dev = port_priv->port->serial->dev;
+ u8 urb_value;
+ int status;
+ unsigned long flags;
+
+ if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
+ dev_dbg(&dev->dev, "%s fail - DTR|RTS %d\n",
+ __func__, __LINE__);
+ return 0; /* no change */
+ }
+
+ clear &= ~set; /* 'set' takes precedence over 'clear' */
+ urb_value = 8 | port_priv->line_control;
+
+ if (clear & TIOCM_DTR) {
+ urb_value &= ~UART_MCR_DTR;
+ dev_dbg(&dev->dev, "clear DTR\n");
+ }
+
+ if (clear & TIOCM_RTS) {
+ urb_value &= ~UART_MCR_RTS;
+ dev_dbg(&dev->dev, "clear RTS\n");
+ }
+
+ if (set & TIOCM_DTR) {
+ urb_value |= UART_MCR_DTR;
+ dev_dbg(&dev->dev, "set DTR\n");
+ }
+
+ if (set & TIOCM_RTS) {
+ urb_value |= UART_MCR_RTS;
+ dev_dbg(&dev->dev, "set RTS\n");
+ }
+
+ dev_dbg(&dev->dev, "%s n:%x o:%x\n", __func__, urb_value,
+ port_priv->line_control);
+
+ status = f81232_set_register(dev, MODEM_CONTROL_REGISTER, urb_value);
+
+ if (status < 0) {
+ dev_dbg(&dev->dev, "%s read MSR status < 0\n", __func__);
+ } else {
+ spin_lock_irqsave(&port_priv->lock, flags);
+ port_priv->line_control = urb_value;
+ spin_unlock_irqrestore(&port_priv->lock, flags);
+ }
+
+ f81232_read_msr(port_priv);
+
+ return status;
+}
+
static void f81232_update_line_status(struct usb_serial_port *port,
unsigned char *data,
unsigned int actual_length)
@@ -261,12 +314,6 @@ static void f81232_process_read_urb(struct urb *urb)

}

-static int set_control_lines(struct usb_device *dev, u8 value)
-{
- /* FIXME - Stubbed out for now */
- return 0;
-}
-
static void f81232_break_ctl(struct tty_struct *tty, int break_state)
{
/* FIXME - Stubbed out for now */
@@ -383,14 +430,35 @@ static void f81232_set_termios(struct tty_struct *tty,

static int f81232_tiocmget(struct tty_struct *tty)
{
- /* FIXME - Stubbed out for now */
- return 0;
+ int r;
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *port_priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ u8 mcr, msr;
+
+ spin_lock_irqsave(&port_priv->lock, flags);
+ mcr = port_priv->line_control;
+ msr = port_priv->line_status;
+ spin_unlock_irqrestore(&port_priv->lock, flags);
+
+ r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
+ (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
+ (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
+ (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
+ (msr & UART_MSR_RI ? TIOCM_RI : 0) |
+ (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
+
+ return r;
}

static int f81232_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
- /* FIXME - Stubbed out for now */
+ struct usb_serial_port *port = tty->driver_data;
+ struct f81232_private *port_priv =
+ usb_get_serial_port_data(port);
+
+ update_mctrl(port_priv, set, clear);
return 0;
}

@@ -427,18 +495,11 @@ static void f81232_close(struct usb_serial_port *port)
static void f81232_dtr_rts(struct usb_serial_port *port, int on)
{
struct f81232_private *priv = usb_get_serial_port_data(port);
- unsigned long flags;
- u8 control;

- spin_lock_irqsave(&priv->lock, flags);
- /* Change DTR and RTS */
if (on)
- priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
+ update_mctrl(priv, TIOCM_DTR | TIOCM_RTS, 0);
else
- priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
- control = priv->line_control;
- spin_unlock_irqrestore(&priv->lock, flags);
- set_control_lines(port->serial->dev, control);
+ update_mctrl(priv, 0, TIOCM_DTR | TIOCM_RTS);
}

static int f81232_carrier_raised(struct usb_serial_port *port)
--
1.9.1


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