USB: ark3116: add IrDA support for Gembird UIR-22

Add IrDA support to ark3116 driver.  This makes Gembird UIR-22 USB to IrDA
adapter work (vendor ID 0x18ec, device ID 0x3118).  This adapter contains
ARK3116T USB serial chip and an IrDA transceiver, thus a command like
"irattach /dev/ttyUSB0 -s" is needed.

All magic numbers were captured using usbsnoop from windows driver that
came with the device.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 23 insertions, 1 deletions

diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
index 5d25d3e52bf6..131e61adaaf7 100644
--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -31,10 +31,20 @@ static int debug;
 
 static struct usb_device_id id_table [] = {
         { USB_DEVICE(0x6547, 0x0232) },
+        { USB_DEVICE(0x18ec, 0x3118) },         /* USB to IrDA adapter */
         { },
 };
 MODULE_DEVICE_TABLE(usb, id_table);
 
+static int is_irda(struct usb_serial *serial)
+{
+        struct usb_device *dev = serial->dev;
+        if (le16_to_cpu(dev->descriptor.idVendor) == 0x18ec &&
+                        le16_to_cpu(dev->descriptor.idProduct) == 0x3118)
+                return 1;
+        return 0;
+}
+
 static inline void ARK3116_SND(struct usb_serial *serial, int seq,
                                __u8 request, __u8 requesttype,
                                __u16 value, __u16 index)
@@ -84,11 +94,21 @@ static int ark3116_attach(struct usb_serial *serial)
                 return -ENOMEM;
         }
 
+        if (is_irda(serial))
+                dbg("IrDA mode");
+
         /* 3 */
         ARK3116_SND(serial, 3, 0xFE, 0x40, 0x0008, 0x0002);
         ARK3116_SND(serial, 4, 0xFE, 0x40, 0x0008, 0x0001);
         ARK3116_SND(serial, 5, 0xFE, 0x40, 0x0000, 0x0008);
-        ARK3116_SND(serial, 6, 0xFE, 0x40, 0x0000, 0x000B);
+        ARK3116_SND(serial, 6, 0xFE, 0x40, is_irda(serial) ? 0x0001 : 0x0000,
+                    0x000B);
+
+        if (is_irda(serial)) {
+                ARK3116_SND(serial, 1001, 0xFE, 0x40, 0x0000, 0x000C);
+                ARK3116_SND(serial, 1002, 0xFE, 0x40, 0x0041, 0x000D);
+                ARK3116_SND(serial, 1003, 0xFE, 0x40, 0x0001, 0x000A);
+        }
 
         /* <-- seq7 */
         ARK3116_RCV(serial,  7, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
@@ -125,6 +145,8 @@ static int ark3116_attach(struct usb_serial *serial)
         ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
         ARK3116_SND(serial, 148, 0xFE, 0x40, 0x0038, 0x0000);
         ARK3116_SND(serial, 149, 0xFE, 0x40, 0x0001, 0x0001);
+        if (is_irda(serial))
+                ARK3116_SND(serial, 1004, 0xFE, 0x40, 0x0000, 0x0009);
         ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
         ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
         ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);