diff options
Diffstat (limited to 'drivers/usb/serial/f81534.c')
| -rw-r--r-- | drivers/usb/serial/f81534.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c index 3d616a2a9f96..4ced064dbcc4 100644 --- a/drivers/usb/serial/f81534.c +++ b/drivers/usb/serial/f81534.c @@ -39,9 +39,11 @@ #define F81534_UART_OFFSET 0x10 #define F81534_DIVISOR_LSB_REG (0x00 + F81534_UART_BASE_ADDRESS) #define F81534_DIVISOR_MSB_REG (0x01 + F81534_UART_BASE_ADDRESS) +#define F81534_INTERRUPT_ENABLE_REG (0x01 + F81534_UART_BASE_ADDRESS) #define F81534_FIFO_CONTROL_REG (0x02 + F81534_UART_BASE_ADDRESS) #define F81534_LINE_CONTROL_REG (0x03 + F81534_UART_BASE_ADDRESS) #define F81534_MODEM_CONTROL_REG (0x04 + F81534_UART_BASE_ADDRESS) +#define F81534_LINE_STATUS_REG (0x05 + F81534_UART_BASE_ADDRESS) #define F81534_MODEM_STATUS_REG (0x06 + F81534_UART_BASE_ADDRESS) #define F81534_CONFIG1_REG (0x09 + F81534_UART_BASE_ADDRESS) @@ -126,6 +128,8 @@ struct f81534_serial_private { struct f81534_port_private { struct mutex mcr_mutex; + struct work_struct lsr_work; + struct usb_serial_port *port; unsigned long tx_empty; spinlock_t msr_lock; u8 shadow_mcr; @@ -1015,6 +1019,8 @@ static void f81534_process_per_serial_block(struct usb_serial_port *port, tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); } + + schedule_work(&port_priv->lsr_work); } if (port->port.console && port->sysrq) { @@ -1162,6 +1168,21 @@ static int f81534_attach(struct usb_serial *serial) return 0; } +static void f81534_lsr_worker(struct work_struct *work) +{ + struct f81534_port_private *port_priv; + struct usb_serial_port *port; + int status; + u8 tmp; + + port_priv = container_of(work, struct f81534_port_private, lsr_work); + port = port_priv->port; + + status = f81534_get_port_register(port, F81534_LINE_STATUS_REG, &tmp); + if (status) + dev_warn(&port->dev, "read LSR failed: %d\n", status); +} + static int f81534_port_probe(struct usb_serial_port *port) { struct f81534_port_private *port_priv; @@ -1173,6 +1194,7 @@ static int f81534_port_probe(struct usb_serial_port *port) spin_lock_init(&port_priv->msr_lock); mutex_init(&port_priv->mcr_mutex); + INIT_WORK(&port_priv->lsr_work, f81534_lsr_worker); /* Assign logic-to-phy mapping */ ret = f81534_logic_to_phy_port(port->serial, port); @@ -1180,10 +1202,30 @@ static int f81534_port_probe(struct usb_serial_port *port) return ret; port_priv->phy_num = ret; + port_priv->port = port; usb_set_serial_port_data(port, port_priv); dev_dbg(&port->dev, "%s: port_number: %d, phy_num: %d\n", __func__, port->port_number, port_priv->phy_num); + /* + * The F81532/534 will hang-up when enable LSR interrupt in IER and + * occur data overrun. So we'll disable the LSR interrupt in probe() + * and submit the LSR worker to clear LSR state when reported LSR error + * bit with bulk-in data in f81534_process_per_serial_block(). + */ + ret = f81534_set_port_register(port, F81534_INTERRUPT_ENABLE_REG, + UART_IER_RDI | UART_IER_THRI | UART_IER_MSI); + if (ret) + return ret; + + return 0; +} + +static int f81534_port_remove(struct usb_serial_port *port) +{ + struct f81534_port_private *port_priv = usb_get_serial_port_data(port); + + flush_work(&port_priv->lsr_work); return 0; } @@ -1317,6 +1359,7 @@ static struct usb_serial_driver f81534_device = { .calc_num_ports = f81534_calc_num_ports, .attach = f81534_attach, .port_probe = f81534_port_probe, + .port_remove = f81534_port_remove, .dtr_rts = f81534_dtr_rts, .process_read_urb = f81534_process_read_urb, .ioctl = f81534_ioctl, |