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USB: serial: f81534: implement break control 

Implement Fintek f81534 break on/off with LCR register.
It's the same with 16550A LCR register layout.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2017-10-13 10:21:35 +08:00 committed by Johan Hovold
parent dea744bae7
commit 7c36e6e14d
1 changed files with 41 additions and 6 deletions
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47
drivers/usb/serial/f81534.c
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@ -128,11 +128,13 @@ struct f81534_serial_private {
struct f81534_port_private {
struct mutex mcr_mutex;
struct mutex lcr_mutex;
struct work_struct lsr_work;
struct usb_serial_port *port;
unsigned long tx_empty;
spinlock_t msr_lock;
u8 shadow_mcr;
u8 shadow_lcr;
u8 shadow_msr;
u8 phy_num;
};
@ -465,6 +467,7 @@ static u32 f81534_calc_baud_divisor(u32 baudrate, u32 clockrate)
static int f81534_set_port_config(struct usb_serial_port *port, u32 baudrate,
u8 lcr)
{
struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
u32 divisor;
int status;
u8 value;
@ -493,35 +496,65 @@ static int f81534_set_port_config(struct usb_serial_port *port, u32 baudrate,
}
divisor = f81534_calc_baud_divisor(baudrate, F81534_MAX_BAUDRATE);
mutex_lock(&port_priv->lcr_mutex);
value = UART_LCR_DLAB;
status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG,
value);
if (status) {
dev_err(&port->dev, "%s: set LCR failed\n", __func__);
return status;
goto out_unlock;
}
value = divisor & 0xff;
status = f81534_set_port_register(port, F81534_DIVISOR_LSB_REG, value);
if (status) {
dev_err(&port->dev, "%s: set DLAB LSB failed\n", __func__);
return status;
goto out_unlock;
}
value = (divisor >> 8) & 0xff;
status = f81534_set_port_register(port, F81534_DIVISOR_MSB_REG, value);
if (status) {
dev_err(&port->dev, "%s: set DLAB MSB failed\n", __func__);
return status;
goto out_unlock;
}
status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG, lcr);
value = lcr | (port_priv->shadow_lcr & UART_LCR_SBC);
status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG,
value);
if (status) {
dev_err(&port->dev, "%s: set LCR failed\n", __func__);
return status;
goto out_unlock;
}
return 0;
port_priv->shadow_lcr = value;
out_unlock:
mutex_unlock(&port_priv->lcr_mutex);
return status;
}
static void f81534_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
int status;
mutex_lock(&port_priv->lcr_mutex);
if (break_state)
port_priv->shadow_lcr |= UART_LCR_SBC;
else
port_priv->shadow_lcr &= ~UART_LCR_SBC;
status = f81534_set_port_register(port, F81534_LINE_CONTROL_REG,
port_priv->shadow_lcr);
if (status)
dev_err(&port->dev, "set break failed: %d\n", status);
mutex_unlock(&port_priv->lcr_mutex);
}
static int f81534_update_mctrl(struct usb_serial_port *port, unsigned int set,
@ -1194,6 +1227,7 @@ static int f81534_port_probe(struct usb_serial_port *port)
spin_lock_init(&port_priv->msr_lock);
mutex_init(&port_priv->mcr_mutex);
mutex_init(&port_priv->lcr_mutex);
INIT_WORK(&port_priv->lsr_work, f81534_lsr_worker);
/* Assign logic-to-phy mapping */
@ -1360,6 +1394,7 @@ static struct usb_serial_driver f81534_device = {
.attach = f81534_attach,
.port_probe = f81534_port_probe,
.port_remove = f81534_port_remove,
.break_ctl = f81534_break_ctl,
.dtr_rts = f81534_dtr_rts,
.process_read_urb = f81534_process_read_urb,
.ioctl = f81534_ioctl,