Hello.
On 20-03-2012 0:46, Aleksey Babahin wrote:
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@xxxxxxxxx>
---
drivers/usb/serial/metro-usb.c | 53 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/serial/metro-usb.c b/drivers/usb/serial/metro-usb.c
index 92b6f85..2df2217 100644
--- a/drivers/usb/serial/metro-usb.c
+++ b/drivers/usb/serial/metro-usb.c
@@ -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);
Why use kzalloc() if you assign the value immediately after?
+ if (!buffer_cmd)
+ return -ENOMEM;
+
+ *buffer_cmd = cmd;
[...]
WBR, Sergei
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