[PATCH V1 2/6] USB: serial: f81232: Force F81534A with RS232 mode

["Ji-Ze Hong (Peter Hong)" <hpeter@gmail.com>]

Force F81534A series UARTs with RS232 mode in port_probe().

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
---
 drivers/usb/serial/f81232.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 84efcc66aa56..75dfc0b9ef30 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -83,12 +83,22 @@ MODULE_DEVICE_TABLE(usb, id_table);
 #define F81232_F81232_TYPE		1
 #define F81232_F81534A_TYPE		2
 
+/* Serial port self GPIO control, 2bytes [control&output data][input data] */
+#define F81534A_GPIO_REG		0x10e
+#define F81534A_GPIO_MODE2_DIR		BIT(6) /* 1: input, 0: output */
+#define F81534A_GPIO_MODE1_DIR		BIT(5)
+#define F81534A_GPIO_MODE0_DIR		BIT(4)
+#define F81534A_GPIO_MODE2_OUTPUT	BIT(2)
+#define F81534A_GPIO_MODE1_OUTPUT	BIT(1)
+#define F81534A_GPIO_MODE0_OUTPUT	BIT(0)
+
 struct f81232_private {
 	struct mutex lock;
 	u8 modem_control;
 	u8 modem_status;
 	u8 shadow_lcr;
 	u8 device_type;
+	u8 gpio_mode;
 	speed_t baud_base;
 	struct work_struct lsr_work;
 	struct work_struct interrupt_work;
@@ -871,6 +881,11 @@ static int f81232_port_probe(struct usb_serial_port *port)
 	switch (priv->device_type) {
 	case F81232_F81534A_TYPE:
 		priv->process_read_urb = f81534a_process_read_urb;
+		priv->gpio_mode = F81534A_GPIO_MODE2_DIR;
+
+		/* tri-state with pull-high, default RS232 Mode */
+		status = f81232_set_register(port, F81534A_GPIO_REG,
+					priv->gpio_mode);
 		break;
 
 	case F81232_F81232_TYPE:
-- 
2.7.4