redonkable/alistair23-linux
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USB: serial: metro-usb: get data from device in Uni-Directional mode.

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We should send special control command to tell device start or stop
transmitting a data.

In Bi-Directional mode that cmd`s are not required.

Signed-off-by: Aleksey Babahin <tamerlan311@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksey Babahin 2012-03-20 00:46:33 +04:00 committed by Greg Kroah-Hartman
parent 28a4b6a690
commit 704577861d
1 changed files with 53 additions and 0 deletions
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53
drivers/usb/serial/metro-usb.c
View file

@ -56,6 +56,47 @@ MODULE_DEVICE_TABLE(usb, id_table);
/* Input parameter constants. */
static bool debug;
/* UNI-Directional mode commands for device configure */
#define UNI_CMD_OPEN 0x80
#define UNI_CMD_CLOSE 0xFF
inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
{
__u16 product_id = le16_to_cpu(
port->serial->dev->descriptor.idProduct);
return product_id == FOCUS_PRODUCT_ID_UNI;
}
static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
{
int ret;
int actual_len;
u8 *buffer_cmd = NULL;
if (!metrousb_is_unidirectional_mode(port))
return 0;
buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
if (!buffer_cmd)
return -ENOMEM;
*buffer_cmd = cmd;
ret = usb_interrupt_msg(port->serial->dev,
usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
buffer_cmd, sizeof(cmd),
&actual_len, USB_CTRL_SET_TIMEOUT);
kfree(buffer_cmd);
if (ret < 0)
return ret;
else if (actual_len != sizeof(cmd))
return -EIO;
return 0;
}
static void metrousb_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
@ -154,6 +195,9 @@ static void metrousb_cleanup(struct usb_serial_port *port)
usb_unlink_urb(port->interrupt_in_urb);
usb_kill_urb(port->interrupt_in_urb);
}
/* Send deactivate cmd to device */
metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
}
}
@ -205,6 +249,15 @@ static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
goto exit;
}
/* Send activate cmd to device */
result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
if (result) {
dev_err(&port->dev,
"%s - failed to configure device for port number=%d, error code=%d\n",
__func__, port->number, result);
goto exit;
}
dev_dbg(&port->dev, "%s - port open\n", __func__);
exit:
return result;