From: Petr Tesarik <ptesarik@xxxxxxx>
Query and store the CP210x part number.
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxxx>
---
drivers/usb/serial/cp210x.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 69f03b6..dbfc722 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -199,6 +199,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
struct cp210x_serial_private {
__u8 bInterfaceNumber;
+ __u8 bPartNumber;
};
static struct usb_serial_driver cp210x_device = {
@@ -264,6 +265,7 @@ enum cp210x_request_type {
#define CP210X_SET_CHARS 0x19
#define CP210X_GET_BAUDRATE 0x1D
#define CP210X_SET_BAUDRATE 0x1E
+#define CP210X_VENDOR_SPECIFIC 0xFF
/* CP210X_IFC_ENABLE */
#define UART_ENABLE 0x0001
@@ -306,6 +308,17 @@ enum cp210x_request_type {
#define CONTROL_WRITE_DTR 0x0100
#define CONTROL_WRITE_RTS 0x0200
+/* CP210X_VENDOR_SPECIFIC */
+#define CP210X_GET_PARTNUM 0x370B
+
+/* Part number definitions */
+#define CP2101_PARTNUM 0x01
+#define CP2102_PARTNUM 0x02
+#define CP2103_PARTNUM 0x03
+#define CP2104_PARTNUM 0x04
+#define CP2105_PARTNUM 0x05
+#define CP2108_PARTNUM 0x08
+
/*
* cp210x_control_msg
* Sends a generic control message, taking care of endianness
@@ -862,6 +875,7 @@ static int cp210x_startup(struct usb_serial *serial)
{
struct usb_host_interface *cur_altsetting;
struct cp210x_serial_private *spriv;
+ unsigned int partnum;
spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
if (!spriv)
@@ -872,6 +886,12 @@ static int cp210x_startup(struct usb_serial *serial)
usb_set_serial_data(serial, spriv);
+ /* Get the 1-byte part number of the cp210x device */
+ cp210x_control_msg(serial->port[0], CP210X_VENDOR_SPECIFIC,
+ REQTYPE_DEVICE_TO_HOST, CP210X_GET_PARTNUM,
+ &partnum, 1, USB_CTRL_GET_TIMEOUT);
+ spriv->bPartNumber = partnum & 0xFF;
+
return 0;
}
--
2.1.4
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