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Date: Fri, 30 Jan 2015 14:13:39 +0800
From: Peter Hung <hpeter@...il.com>
To: johan@...nel.org
Cc: gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, tom_tsai@...tek.com.tw,
peter_hong@...tek.com.tw,
Peter Hung <hpeter+linux_kernel@...il.com>
Subject: [PATCH v4 5/7] usb: serial: implement set_termios for F81232
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.
Signed-off-by: Peter Hung <hpeter+linux_kernel@...il.com>
---
drivers/usb/serial/f81232.c | 144 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 137 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 12e1ae4..248f40d 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -51,6 +51,10 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define F81232_USB_TIMEOUT 3000
#define SERIAL_BASE_ADDRESS (0x0120)
+#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
+#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_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
struct f81232_private {
spinlock_t lock;
@@ -61,6 +65,20 @@ struct f81232_private {
struct usb_serial_port *port;
};
+static inline int calc_baud_divisor(u32 baudrate)
+{
+ u32 divisor, rem;
+
+ divisor = 115200L / baudrate;
+ rem = 115200L % baudrate;
+
+ /* Round to nearest divisor */
+ if (((rem * 2) >= baudrate) && (baudrate != 110))
+ divisor++;
+
+ return divisor;
+}
+
static inline int f81232_get_register(struct usb_device *dev,
u16 reg, u8 *data)
{
@@ -84,6 +102,29 @@ static inline int f81232_get_register(struct usb_device *dev,
return status;
}
+static inline int f81232_set_register(struct usb_device *dev,
+ u16 reg, u8 data)
+{
+ int status;
+
+ status = usb_control_msg(dev,
+ usb_sndctrlpipe(dev, 0),
+ REGISTER_REQUEST,
+ SET_REGISTER,
+ reg,
+ 0,
+ &data,
+ 1,
+ F81232_USB_TIMEOUT);
+
+ if (status < 0) {
+ dev_dbg(&dev->dev,
+ "%s status: %d\n", __func__, status);
+ }
+
+ return status;
+}
+
static void f81232_read_msr(struct f81232_private *priv)
{
int status;
@@ -240,15 +281,104 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
static void f81232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
- /* FIXME - Stubbed out for now */
+ u16 divisor;
+ u16 new_lcr = 0;
+ u8 data;
+ int status;
+ struct ktermios *termios = &tty->termios;
+ struct usb_device *dev = port->serial->dev;
+ unsigned int cflag = termios->c_cflag;
- /* Don't change anything if nothing has changed */
- if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
- return;
+ divisor = calc_baud_divisor(tty_get_baud_rate(tty));
+
+ status = f81232_set_register(dev, LINE_CONTROL_REGISTER,
+ UART_LCR_DLAB); /* DLAB */
+
+ if (status < 0) {
+ dev_dbg(&dev->dev,
+ "%s status: %d line:%d\n", __func__, status, __LINE__);
+ }
+
+ status = f81232_set_register(dev, RECEIVE_BUFFER_REGISTER,
+ divisor & 0x00ff); /* low */
+
+ if (status < 0) {
+ dev_dbg(&dev->dev,
+ "%s status: %d line:%d\n", __func__, status, __LINE__);
+ }
+
+ status = f81232_set_register(dev, INTERRUPT_ENABLE_REGISTER,
+ (divisor & 0xff00) >> 8); /* high */
+
+ if (status < 0) {
+ dev_dbg(&dev->dev,
+ "%s status: %d line:%d\n", __func__, status, __LINE__);
+ }
+
+ status = f81232_set_register(dev, LINE_CONTROL_REGISTER, 0x00);
+
+ if (status < 0) {
+ dev_dbg(&dev->dev,
+ "%s status: %d line:%d\n", __func__, status, __LINE__);
+ }
+
+ if (cflag & PARENB) {
+ new_lcr |= UART_LCR_PARITY; /* default parity on/odd */
+
+ if (cflag & CMSPAR) {
+ if (cflag & PARODD) {
+ /* stick mark */
+ new_lcr |= UART_LCR_SPAR;
+ } else {
+ /* stick space */
+ new_lcr |= (UART_LCR_EPAR | UART_LCR_SPAR);
+ }
+ } else {
+ if (!(cflag & PARODD)) {
+ /* even */
+ new_lcr |= UART_LCR_EPAR;
+ }
+ }
+ }
+
+ if (cflag & CSTOPB)
+ new_lcr |= UART_LCR_STOP;
+ else
+ new_lcr &= ~UART_LCR_STOP;
+
+ switch (cflag & CSIZE) {
+ case CS5:
+ new_lcr |= UART_LCR_WLEN5;
+ break;
+ case CS6:
+ new_lcr |= UART_LCR_WLEN6;
+ break;
+ case CS7:
+ new_lcr |= UART_LCR_WLEN7;
+ break;
+ default:
+ case CS8:
+ new_lcr |= UART_LCR_WLEN8;
+ break;
+ }
+
+ status |= f81232_set_register(dev, LINE_CONTROL_REGISTER, new_lcr);
+
+ /* fifo on, trigger8, clear TX/RX*/
+ data = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR
+ | UART_FCR_CLEAR_XMIT;
+
+ status |= f81232_set_register(dev, FIFO_CONTROL_REGISTER, data);
+
+ data = UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI;
+
+ status |= f81232_set_register(dev,
+ INTERRUPT_ENABLE_REGISTER, 0xf); /* IER */
+
+ if (status < 0)
+ dev_err(&port->dev, "LINE_CONTROL_REGISTER set error: %d\n",
+ status);
- /* Do the real work here... */
- if (old_termios)
- tty_termios_copy_hw(&tty->termios, old_termios);
}
static int f81232_tiocmget(struct tty_struct *tty)
--
1.9.1
--
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