[PATCH] USB:Serial:pl2303:Add new Pull-UP Mode to support PL2303HXD(TYPE_HX)

[Charles Yeh]

The Pull-UP mode only support PL2303HXD,it needs to use addition schematic 
design.

Signed-off-by: Charles Yeh <charlesyeh...@gmail.com>
---
 drivers/usb/serial/pl2303.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 98e7a5df0f6d..72544e5c928d 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -144,6 +144,9 @@ MODULE_DEVICE_TABLE(usb, id_table);
 #define UART_OVERRUN_ERROR             0x40
 #define UART_CTS                       0x80
 
+#define TYPE_HX_PULLUP_MODE_DATA       0x08
+#define TYPE_HX_PULLUP_MODE_REG                0x09
+
 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
 
 enum pl2303_type {
@@ -687,6 +690,15 @@ static void pl2303_set_termios(struct tty_struct *tty,
                pl2303_vendor_write(serial, 0x0, 0x0);
        }
 
+       pl2303_vendor_read(serial, 0x8484, buf);
+       pl2303_vendor_write(serial, 0x0404, TYPE_HX_PULLUP_MODE_REG);
+       pl2303_vendor_read(serial, 0x8484, buf);
+       pl2303_vendor_read(serial, 0x8383, buf);
+       if (*buf == TYPE_HX_PULLUP_MODE_DATA) {
+               pl2303_vendor_write(serial, 0x0, 0x31);
+               pl2303_vendor_write(serial, 0x1, 0x01);
+       }
+
        kfree(buf);
 }
 
-- 
2.19.1