USB: serial: pl2303: add support for more HXN (G) types

BugLink: https://bugs.launchpad.net/bugs/1986718
commit ae60aac59a9ad8ab64a4b07de509a534a75b6bac upstream.

Add support for further HXN (G) type devices (GT variant, GL variant, GS
variant and GR) and document the bcdDevice mapping.

Note that the TA and TB types use the same bcdDevice as some GT and GE
variants, respectively, but that the HX status request can be used to
determine which is which.

Also note that we currently do not distinguish between the various HXN
(G) types in the driver but that this may change eventually (e.g. when
adding GPIO support).

Reported-by: Charles Yeh <charlesyeh522@gmail.com>
Link: https://lore.kernel.org/r/YrF77b9DdeumUAee@hovoldconsulting.com
Cc: stable@vger.kernel.org	# 5.13
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 3506c47e1eef023b1ba6e9e0c81089aa3d3fe340..40b1ab3d284dcb1ae1a7cc0e85cebcbb0bb774ac 100644 (file)
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -436,22 +436,27 @@ static int pl2303_detect_type(struct usb_serial *serial)
                break;
        case 0x200:
                switch (bcdDevice) {
-               case 0x100:
+               case 0x100:     /* GC */
                case 0x105:
+                       return TYPE_HXN;
+               case 0x300:     /* GT / TA */
+                       if (pl2303_supports_hx_status(serial))
+                               return TYPE_TA;
+                       fallthrough;
                case 0x305:
+               case 0x400:     /* GL */
                case 0x405:
+                       return TYPE_HXN;
+               case 0x500:     /* GE / TB */
+                       if (pl2303_supports_hx_status(serial))
+                               return TYPE_TB;
+                       fallthrough;
+               case 0x505:
+               case 0x600:     /* GS */
                case 0x605:
-                       /*
-                        * Assume it's an HXN-type if the device doesn't
-                        * support the old read request value.
-                        */
-                       if (!pl2303_supports_hx_status(serial))
-                               return TYPE_HXN;
-                       break;
-               case 0x300:
-                       return TYPE_TA;
-               case 0x500:
-                       return TYPE_TB;
+               case 0x700:     /* GR */
+               case 0x705:
+                       return TYPE_HXN;
                }
                break;
        }