[PATCH V1 4/4] usb: serial: f81534: add H/W disable port support

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

The F81532/534 can be disable port by manufacturer with
following H/W design.
    1: Connect DCD/DSR/CTS/RI pin to ground.
    2: Connect RX pin to ground.

In driver, we'll implements some detect method likes following:
    1: Read MSR.
    2: Turn MCR LOOP bit on, off and read LSR after delay with 60ms.
       It'll contain BREAK status in LSR.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
---
 drivers/usb/serial/f81534.c | 74 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 30b966d71ae8..18bd2a478199 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -751,6 +751,74 @@ static int f81534_find_config_idx(struct usb_serial *serial, u8 *index)
 }
 
 /*
+ * The F81532/534 will not report serial port to USB serial subsystem when
+ * H/W DCD/DSR/CTS/RI/RX pin connected to ground.
+ *
+ * To detect RX pin status, we'll enable MCR interal loopback, disable it and
+ * delayed for 60ms. It connected to ground If LSR register report UART_LSR_BI.
+ */
+static int f81534_check_port_hw_disabled(struct usb_serial *serial, int phy)
+{
+	int status;
+	u8 old_mcr;
+	u8 msr;
+	u8 lsr;
+	u8 msr_mask;
+
+	msr_mask = UART_MSR_DCD | UART_MSR_RI | UART_MSR_DSR | UART_MSR_CTS;
+
+	status = f81534_get_register(serial,
+				F81534_MODEM_STATUS_REG + phy * 0x10, &msr);
+	if (status)
+		return status;
+
+	if ((msr & msr_mask) != msr_mask)
+		return 0;
+
+	status = f81534_set_register(serial,
+				F81534_FIFO_CONTROL_REG + phy * 0x10,
+				UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
+				UART_FCR_CLEAR_XMIT);
+	if (status)
+		return status;
+
+	status = f81534_get_register(serial,
+				F81534_MODEM_CONTROL_REG + phy * 0x10,
+				&old_mcr);
+	if (status)
+		return status;
+
+	status = f81534_set_register(serial,
+				F81534_MODEM_CONTROL_REG + phy * 0x10,
+				UART_MCR_LOOP);
+	if (status)
+		return status;
+
+	status = f81534_set_register(serial,
+				F81534_MODEM_CONTROL_REG + phy * 0x10, 0x0);
+	if (status)
+		return status;
+
+	msleep(60);
+
+	status = f81534_get_register(serial,
+				F81534_LINE_STATUS_REG + phy * 0x10, &lsr);
+	if (status)
+		return status;
+
+	status = f81534_set_register(serial,
+				F81534_MODEM_CONTROL_REG + phy * 0x10,
+				old_mcr);
+	if (status)
+		return status;
+
+	if ((lsr & UART_LSR_BI) == UART_LSR_BI)
+		return -ENODEV;
+
+	return 0;
+}
+
+/*
  * We had 2 generation of F81532/534 IC. All has an internal storage.
  *
  * 1st is pure USB-to-TTL RS232 IC and designed for 4 ports only, no any
@@ -832,6 +900,9 @@ static int f81534_calc_num_ports(struct usb_serial *serial,
 
 	/* New style, find all possible ports */
 	for (i = 0; i < F81534_NUM_PORT; ++i) {
+		if (f81534_check_port_hw_disabled(serial, i))
+			continue;
+
 		if (setting[i] & F81534_PORT_UNAVAILABLE)
 			continue;
 
@@ -1306,6 +1377,9 @@ static int f81534_attach(struct usb_serial *serial)
 
 	/* Assign phy-to-logic mapping */
 	for (i = 0; i < F81534_NUM_PORT; ++i) {
+		if (f81534_check_port_hw_disabled(serial, i))
+			serial_priv->conf_data[i] |= F81534_PORT_UNAVAILABLE;
+
 		if (serial_priv->conf_data[i] & F81534_PORT_UNAVAILABLE)
 			continue;
 
-- 
2.7.4