[PATCH 3/4] cp210x: Store part number

[Petr Tesarik <ptesarik@suse.com>]

From: Petr Tesarik <ptesarik@suse.cz>

Query and store the CP210x part number.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>
---
 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