[PATCH 1/4] ch341: Name more registers

[Michael Hanselmann <public@xxxxxxxxx>]

Add more #defines with register names.

Signed-off-by: Michael Hanselmann <public@xxxxxxxxx>
---
 drivers/usb/serial/ch341.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index c5ecdcd51ffc..518209072c50 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -59,6 +59,8 @@
 #define CH341_REQ_MODEM_CTRL   0xA4
 
 #define CH341_REG_BREAK        0x05
+#define CH341_REG_PRESCALER    0x12
+#define CH341_REG_DIVISOR      0x13
 #define CH341_REG_LCR          0x18
 #define CH341_NBREAK_BITS      0x01
 
@@ -221,6 +223,7 @@ static int ch341_get_divisor(speed_t speed)
 static int ch341_set_baudrate_lcr(struct usb_device *dev,
 				  struct ch341_private *priv, u8 lcr)
 {
+	uint16_t reg;
 	int val;
 	int r;
 
@@ -237,11 +240,15 @@ static int ch341_set_baudrate_lcr(struct usb_device *dev,
 	 */
 	val |= BIT(7);
 
-	r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, val);
+	reg = ((uint16_t)CH341_REG_DIVISOR << 8) | CH341_REG_PRESCALER;
+
+	r = ch341_control_out(dev, CH341_REQ_WRITE_REG, reg, val);
 	if (r)
 		return r;
 
-	r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr);
+	reg = ((uint16_t)0x2500) | CH341_REG_LCR;
+
+	r = ch341_control_out(dev, CH341_REQ_WRITE_REG, reg, lcr);
 	if (r)
 		return r;
 
-- 
2.20.1