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USB: serial: return errors from break handling

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Start propagating errors to user space when setting the break state
fails.

This will be used by follow-on changes to also report when a driver or
device does not support break control.

Tested-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2023-06-04 14:35:03 +02:00
parent 9561de3a55
commit 6ff58ae17f
25 changed files with 140 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/usb/serial/ark3116.c
View File

@ -433,10 +433,11 @@ static int ark3116_tiocmset(struct tty_struct *tty,
return 0;
}
static void ark3116_break_ctl(struct tty_struct *tty, int break_state)
static int ark3116_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ark3116_private *priv = usb_get_serial_port_data(port);
int ret;
/* LCR is also used for other things: protect access */
mutex_lock(&priv->hw_lock);
@ -446,9 +447,11 @@ static void ark3116_break_ctl(struct tty_struct *tty, int break_state)
else
priv->lcr &= ~UART_LCR_SBC;
ark3116_write_reg(port->serial, UART_LCR, priv->lcr);
ret = ark3116_write_reg(port->serial, UART_LCR, priv->lcr);
mutex_unlock(&priv->hw_lock);
return ret;
}
static void ark3116_update_msr(struct usb_serial_port *port, __u8 msr)

12
drivers/usb/serial/belkin_sa.c
View File

@ -46,7 +46,7 @@ static void belkin_sa_process_read_urb(struct urb *urb);
static void belkin_sa_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
static int belkin_sa_tiocmget(struct tty_struct *tty);
static int belkin_sa_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
@ -399,13 +399,19 @@ static void belkin_sa_set_termios(struct tty_struct *tty,
spin_unlock_irqrestore(&priv->lock, flags);
}
static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
int ret;
if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
ret = BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0);
if (ret < 0) {
dev_err(&port->dev, "Set break_ctl %d\n", break_state);
return ret;
}
return 0;
}
static int belkin_sa_tiocmget(struct tty_struct *tty)

35
drivers/usb/serial/ch341.c
View File

@ -562,12 +562,12 @@ static void ch341_set_termios(struct tty_struct *tty,
* TCSBRKP. Due to how the simulation is implemented the duration can't be
* controlled. The duration is always about (1s / 46bd * 9bit) = 196ms.
*/
static void ch341_simulate_break(struct tty_struct *tty, int break_state)
static int ch341_simulate_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ch341_private *priv = usb_get_serial_port_data(port);
unsigned long now, delay;
int r;
int r, r2;
if (break_state != 0) {
dev_dbg(&port->dev, "enter break state requested\n");
@ -599,7 +599,7 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state)
*/
priv->break_end = jiffies + (11 * HZ / CH341_MIN_BPS);
return;
return 0;
}
dev_dbg(&port->dev, "leave break state requested\n");
@ -615,17 +615,22 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state)
schedule_timeout_interruptible(delay);
}
r = 0;
restore:
/* Restore original baud rate */
r = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate,
r2 = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate,
priv->lcr);
if (r < 0)
if (r2 < 0) {
dev_err(&port->dev,
"restoring original baud rate of %u failed: %d\n",
priv->baud_rate, r);
priv->baud_rate, r2);
return r2;
}
return r;
}
static void ch341_break_ctl(struct tty_struct *tty, int break_state)
static int ch341_break_ctl(struct tty_struct *tty, int break_state)
{
const uint16_t ch341_break_reg =
((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK;
@ -635,17 +640,17 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state)
uint16_t reg_contents;
uint8_t break_reg[2];
if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK) {
ch341_simulate_break(tty, break_state);
return;
}
if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK)
return ch341_simulate_break(tty, break_state);
r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
ch341_break_reg, 0, break_reg, 2);
if (r) {
dev_err(&port->dev, "%s - USB control read error (%d)\n",
__func__, r);
return;
if (r > 0)
r = -EIO;
return r;
}
dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n",
__func__, break_reg[0], break_reg[1]);
@ -663,9 +668,13 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state)
reg_contents = get_unaligned_le16(break_reg);
r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
ch341_break_reg, reg_contents);
if (r < 0)
if (r < 0) {
dev_err(&port->dev, "%s - USB control write error (%d)\n",
__func__, r);
return r;
}
return 0;
}
static int ch341_tiocmset(struct tty_struct *tty,

8
drivers/usb/serial/cp210x.c
View File

@ -39,7 +39,7 @@ static int cp210x_tiocmget(struct tty_struct *);
static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
static int cp210x_tiocmset_port(struct usb_serial_port *port,
unsigned int, unsigned int);
static void cp210x_break_ctl(struct tty_struct *, int);
static int cp210x_break_ctl(struct tty_struct *, int);
static int cp210x_attach(struct usb_serial *);
static void cp210x_disconnect(struct usb_serial *);
static void cp210x_release(struct usb_serial *);
@ -1434,7 +1434,7 @@ static int cp210x_tiocmget(struct tty_struct *tty)
return result;
}
static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
u16 state;
@ -1443,9 +1443,11 @@ static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
state = BREAK_OFF;
else
state = BREAK_ON;
dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
state == BREAK_OFF ? "off" : "on");
cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
}
#ifdef CONFIG_GPIOLIB

7
drivers/usb/serial/digi_acceleport.c
View File

@ -217,7 +217,7 @@ static void digi_rx_unthrottle(struct tty_struct *tty);
static void digi_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
static void digi_break_ctl(struct tty_struct *tty, int break_state);
static int digi_break_ctl(struct tty_struct *tty, int break_state);
static int digi_tiocmget(struct tty_struct *tty);
static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
unsigned int clear);
@ -839,7 +839,7 @@ static void digi_set_termios(struct tty_struct *tty,
}
static void digi_break_ctl(struct tty_struct *tty, int break_state)
static int digi_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char buf[4];
@ -848,7 +848,8 @@ static void digi_break_ctl(struct tty_struct *tty, int break_state)
buf[1] = 2; /* length */
buf[2] = break_state ? 1 : 0;
buf[3] = 0; /* pad */
digi_write_inb_command(port, buf, 4, 0);
return digi_write_inb_command(port, buf, 4, 0);
}

4
drivers/usb/serial/f81232.c
View File

@ -448,7 +448,7 @@ static void f81534a_process_read_urb(struct urb *urb)
tty_flip_buffer_push(&port->port);
}
static void f81232_break_ctl(struct tty_struct *tty, int break_state)
static int f81232_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct f81232_private *priv = usb_get_serial_port_data(port);
@ -467,6 +467,8 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
dev_err(&port->dev, "set break failed: %d\n", status);
mutex_unlock(&priv->lock);
return status;
}
static int f81232_find_clk(speed_t baudrate)

4
drivers/usb/serial/f81534.c
View File

@ -656,7 +656,7 @@ out_unlock:
return status;
}
static void f81534_break_ctl(struct tty_struct *tty, int break_state)
static int 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);
@ -675,6 +675,8 @@ static void f81534_break_ctl(struct tty_struct *tty, int break_state)
dev_err(&port->dev, "set break failed: %d\n", status);
mutex_unlock(&port_priv->lcr_mutex);
return status;
}
static int f81534_update_mctrl(struct usb_serial_port *port, unsigned int set,

10
drivers/usb/serial/ftdi_sio.c
View File

@ -2550,11 +2550,12 @@ static void ftdi_process_read_urb(struct urb *urb)
tty_flip_buffer_push(&port->port);
}
static void ftdi_break_ctl(struct tty_struct *tty, int break_state)
static int ftdi_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ftdi_private *priv = usb_get_serial_port_data(port);
u16 value;
int ret;
/* break_state = -1 to turn on break, and 0 to turn off break */
/* see drivers/char/tty_io.c to see it used */
@ -2565,19 +2566,22 @@ static void ftdi_break_ctl(struct tty_struct *tty, int break_state)
else
value = priv->last_set_data_value;
if (usb_control_msg(port->serial->dev,
ret = usb_control_msg(port->serial->dev,
usb_sndctrlpipe(port->serial->dev, 0),
FTDI_SIO_SET_DATA_REQUEST,
FTDI_SIO_SET_DATA_REQUEST_TYPE,
value, priv->channel,
NULL, 0, WDR_TIMEOUT) < 0) {
NULL, 0, WDR_TIMEOUT);
if (ret < 0) {
dev_err(&port->dev, "%s FAILED to enable/disable break state (state was %d)\n",
__func__, break_state);
return ret;
}
dev_dbg(&port->dev, "%s break state is %d - urb is %d\n", __func__,
break_state, value);
return 0;
}
static bool ftdi_tx_empty(struct usb_serial_port *port)

6
drivers/usb/serial/io_edgeport.c
View File

@ -1560,12 +1560,12 @@ static int edge_ioctl(struct tty_struct *tty,
* SerialBreak
* this function sends a break to the port
*****************************************************************************/
static void edge_break(struct tty_struct *tty, int break_state)
static int edge_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct edgeport_serial *edge_serial = usb_get_serial_data(port->serial);
int status;
int status = 0;
if (!edge_serial->is_epic ||
edge_serial->epic_descriptor.Supports.IOSPChase) {
@ -1597,6 +1597,8 @@ static void edge_break(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "%s - error sending break set/clear command.\n",
__func__);
}
return status;
}

9
drivers/usb/serial/io_ti.c
View File

@ -2421,7 +2421,7 @@ static int edge_tiocmget(struct tty_struct *tty)
return result;
}
static void edge_break(struct tty_struct *tty, int break_state)
static int edge_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
@ -2430,10 +2430,15 @@ static void edge_break(struct tty_struct *tty, int break_state)
if (break_state == -1)
bv = 1; /* On */
status = ti_do_config(edge_port, UMPC_SET_CLR_BREAK, bv);
if (status)
if (status) {
dev_dbg(&port->dev, "%s - error %d sending break set/clear command.\n",
__func__, status);
return status;
}
return 0;
}
static void edge_heartbeat_schedule(struct edgeport_serial *edge_serial)

5
drivers/usb/serial/keyspan.c
View File

@ -599,7 +599,7 @@ struct keyspan_port_private {
#include "keyspan_usa67msg.h"
static void keyspan_break_ctl(struct tty_struct *tty, int break_state)
static int keyspan_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct keyspan_port_private *p_priv;
@ -611,7 +611,10 @@ static void keyspan_break_ctl(struct tty_struct *tty, int break_state)
else
p_priv->break_on = 0;
/* FIXME: return errors */
keyspan_send_setup(port, 0);
return 0;
}

8
drivers/usb/serial/keyspan_pda.c
View File

@ -299,7 +299,7 @@ static speed_t keyspan_pda_setbaud(struct usb_serial *serial, speed_t baud)
return baud;
}
static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
static int keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
@ -315,9 +315,13 @@ static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
4, /* set break */
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
value, 0, NULL, 0, 2000);
if (result < 0)
if (result < 0) {
dev_dbg(&port->dev, "%s - error %d from usb_control_msg\n",
__func__, result);
return result;
}
return 0;
}
static void keyspan_pda_set_termios(struct tty_struct *tty,

6
drivers/usb/serial/mct_u232.c
View File

@ -47,7 +47,7 @@ static void mct_u232_read_int_callback(struct urb *urb);
static void mct_u232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
static int mct_u232_break_ctl(struct tty_struct *tty, int break_state);
static int mct_u232_tiocmget(struct tty_struct *tty);
static int mct_u232_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
@ -677,7 +677,7 @@ static void mct_u232_set_termios(struct tty_struct *tty,
spin_unlock_irqrestore(&priv->lock, flags);
} /* mct_u232_set_termios */
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
static int mct_u232_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct mct_u232_private *priv = usb_get_serial_port_data(port);
@ -691,7 +691,7 @@ static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
lcr |= MCT_U232_SET_BREAK;
spin_unlock_irqrestore(&priv->lock, flags);
mct_u232_set_line_ctrl(port, lcr);
return mct_u232_set_line_ctrl(port, lcr);
} /* mct_u232_break_ctl */

7
drivers/usb/serial/mos7720.c
View File

@ -996,7 +996,7 @@ static void mos7720_close(struct usb_serial_port *port)
mos7720_port->open = 0;
}
static void mos7720_break(struct tty_struct *tty, int break_state)
static int mos7720_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char data;
@ -1007,7 +1007,7 @@ static void mos7720_break(struct tty_struct *tty, int break_state)
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
return;
return -ENODEV;
if (break_state == -1)
data = mos7720_port->shadowLCR | UART_LCR_SBC;
@ -1015,7 +1015,8 @@ static void mos7720_break(struct tty_struct *tty, int break_state)
data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
mos7720_port->shadowLCR = data;
write_mos_reg(serial, port->port_number, MOS7720_LCR,
return write_mos_reg(serial, port->port_number, MOS7720_LCR,
mos7720_port->shadowLCR);
}

5
drivers/usb/serial/mos7840.c
View File

@ -787,7 +787,7 @@ static void mos7840_close(struct usb_serial_port *port)
* mos7840_break
* this function sends a break to the port
*****************************************************************************/
static void mos7840_break(struct tty_struct *tty, int break_state)
static int mos7840_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
@ -801,7 +801,8 @@ static void mos7840_break(struct tty_struct *tty, int break_state)
/* FIXME: no locking on shadowLCR anywhere in driver */
mos7840_port->shadowLCR = data;
dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
return mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
mos7840_port->shadowLCR);
}

4
drivers/usb/serial/mxuport.c
View File

@ -1230,7 +1230,7 @@ static void mxuport_close(struct usb_serial_port *port)
}
/* Send a break to the port. */
static void mxuport_break_ctl(struct tty_struct *tty, int break_state)
static int mxuport_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
@ -1244,7 +1244,7 @@ static void mxuport_break_ctl(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "%s - clearing break\n", __func__);
}
mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK,
return mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK,
enable, port->port_number);
}

14
drivers/usb/serial/pl2303.c
View File

@ -173,7 +173,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18
#define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c
static void pl2303_set_break(struct usb_serial_port *port, bool enable);
static int pl2303_set_break(struct usb_serial_port *port, bool enable);
enum pl2303_type {
TYPE_H,
@ -1060,7 +1060,7 @@ static int pl2303_carrier_raised(struct usb_serial_port *port)
return 0;
}
static void pl2303_set_break(struct usb_serial_port *port, bool enable)
static int pl2303_set_break(struct usb_serial_port *port, bool enable)
{
struct usb_serial *serial = port->serial;
u16 state;
@ -1077,15 +1077,19 @@ static void pl2303_set_break(struct usb_serial_port *port, bool enable)
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
0, NULL, 0, 100);
if (result)
if (result) {
dev_err(&port->dev, "error sending break = %d\n", result);
return result;
}
return 0;
}
static void pl2303_break_ctl(struct tty_struct *tty, int state)
static int pl2303_break_ctl(struct tty_struct *tty, int state)
{
struct usb_serial_port *port = tty->driver_data;
pl2303_set_break(port, state);
return pl2303_set_break(port, state);
}
static void pl2303_update_line_status(struct usb_serial_port *port,

8
drivers/usb/serial/quatech2.c
View File

@ -741,7 +741,7 @@ static int qt2_tiocmset(struct tty_struct *tty,
return update_mctrl(port_priv, set, clear);
}
static void qt2_break_ctl(struct tty_struct *tty, int break_state)
static int qt2_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct qt2_port_private *port_priv;
@ -754,10 +754,14 @@ static void qt2_break_ctl(struct tty_struct *tty, int break_state)
status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
val, port_priv->device_port);
if (status < 0)
if (status < 0) {
dev_warn(&port->dev,
"%s - failed to send control message: %i\n", __func__,
status);
return status;
}
return 0;
}

10
drivers/usb/serial/ti_usb_3410_5052.c
View File

@ -319,7 +319,7 @@ static void ti_set_termios(struct tty_struct *tty,
static int ti_tiocmget(struct tty_struct *tty);
static int ti_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static void ti_break(struct tty_struct *tty, int break_state);
static int ti_break(struct tty_struct *tty, int break_state);
static void ti_interrupt_callback(struct urb *urb);
static void ti_bulk_in_callback(struct urb *urb);
static void ti_bulk_out_callback(struct urb *urb);
@ -1071,7 +1071,7 @@ static int ti_tiocmset(struct tty_struct *tty,
}
static void ti_break(struct tty_struct *tty, int break_state)
static int ti_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ti_port *tport = usb_get_serial_port_data(port);
@ -1083,8 +1083,12 @@ static void ti_break(struct tty_struct *tty, int break_state)
tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);
if (status)
if (status) {
dev_dbg(&port->dev, "%s - error setting break, %d\n", __func__, status);
return status;
}
return 0;
}
static int ti_get_port_from_code(unsigned char code)

7
drivers/usb/serial/upd78f0730.c
View File

@ -238,12 +238,13 @@ static int upd78f0730_tiocmset(struct tty_struct *tty,
return res;
}
static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
static int upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
{
struct upd78f0730_port_private *private;
struct usb_serial_port *port = tty->driver_data;
struct upd78f0730_set_dtr_rts request;
struct device *dev = &port->dev;
int res;
private = usb_get_serial_port_data(port);
@ -258,8 +259,10 @@ static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
request.params = private->line_signals;
upd78f0730_send_ctl(port, &request, sizeof(request));
res = upd78f0730_send_ctl(port, &request, sizeof(request));
mutex_unlock(&private->lock);
return res;
}
static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on)

2
drivers/usb/serial/usb-serial.c
View File

@ -539,7 +539,7 @@ static int serial_break(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "%s\n", __func__);
if (port->serial->type->break_ctl)
port->serial->type->break_ctl(tty, break_state);
return port->serial->type->break_ctl(tty, break_state);
return 0;
}

13
drivers/usb/serial/usb_debug.c
View File

@ -47,12 +47,19 @@ MODULE_DEVICE_TABLE(usb, id_table_combined);
/* This HW really does not support a serial break, so one will be
* emulated when ever the break state is set to true.
*/
static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
static int usb_debug_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
int ret;
if (!break_state)
return;
usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
return 0;
ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
if (ret < 0)
return ret;
return 0;
}
static void usb_debug_process_read_urb(struct urb *urb)

7
drivers/usb/serial/whiteheat.c
View File

@ -87,7 +87,7 @@ static void whiteheat_set_termios(struct tty_struct *tty,
static int whiteheat_tiocmget(struct tty_struct *tty);
static int whiteheat_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static void whiteheat_break_ctl(struct tty_struct *tty, int break_state);
static int whiteheat_break_ctl(struct tty_struct *tty, int break_state);
static struct usb_serial_driver whiteheat_fake_device = {
.driver = {
@ -449,10 +449,11 @@ static void whiteheat_set_termios(struct tty_struct *tty,
firm_setup_port(tty);
}
static void whiteheat_break_ctl(struct tty_struct *tty, int break_state)
static int whiteheat_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
firm_set_break(port, break_state);
return firm_set_break(port, break_state);
}

4
drivers/usb/serial/xr_serial.c
View File

@ -503,7 +503,7 @@ static void xr_dtr_rts(struct usb_serial_port *port, int on)
xr_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
}
static void xr_break_ctl(struct tty_struct *tty, int break_state)
static int xr_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct xr_data *data = usb_get_serial_port_data(port);
@ -517,7 +517,7 @@ static void xr_break_ctl(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "Turning break %s\n", state == 0 ? "off" : "on");
xr_set_reg_uart(port, type->tx_break, state);
return xr_set_reg_uart(port, type->tx_break, state);
}
/* Tx and Rx clock mask values obtained from section 3.3.4 of datasheet */

2
include/linux/usb/serial.h
View File

@ -278,7 +278,7 @@ struct usb_serial_driver {
int (*set_serial)(struct tty_struct *tty, struct serial_struct *ss);
void (*set_termios)(struct tty_struct *tty, struct usb_serial_port *port,
const struct ktermios *old);
void (*break_ctl)(struct tty_struct *tty, int break_state);
int (*break_ctl)(struct tty_struct *tty, int break_state);
unsigned int (*chars_in_buffer)(struct tty_struct *tty);
void (*wait_until_sent)(struct tty_struct *tty, long timeout);
bool (*tx_empty)(struct usb_serial_port *port);