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USB: serial: f81232: set F81534A serial port with RS232 mode

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The Fintek F81532A/534A/535/536 is USB-to-2/4/8/12 serial ports device
and the serial ports are default disabled. Each port contains max 3 pins
GPIO and the 3 pins are default pull high with input mode.

When the serial port had activated (running probe()), we'll transform the
3 pins from GPIO function publicly to control Tranceiver privately use.
We'll default set to 0/0/1 for control transceiver to RS232 mode.

Otherwise, If the serial port is not active, the 3 pins is in GPIO mode
and controlled by global GPIO device with VID/PID: 2c42/16f8.

Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Ji-Ze Hong (Peter Hong) 2020-01-30 13:47:51 +08:00 committed by Johan Hovold
parent 11301d41ab
commit 0a68ec3d8a
1 changed files with 23 additions and 1 deletions
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24
drivers/usb/serial/f81232.c
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@ -92,6 +92,15 @@ MODULE_DEVICE_TABLE(usb, combined_id_table);
#define F81534A_TRIGGER_MULTIPLE_4X BIT(3)
#define F81534A_FIFO_128BYTE (BIT(1) | BIT(0))
/* 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;
@ -859,6 +868,19 @@ static int f81232_port_probe(struct usb_serial_port *port)
return 0;
}
static int f81534a_port_probe(struct usb_serial_port *port)
{
int status;
/* tri-state with pull-high, default RS232 Mode */
status = f81232_set_register(port, F81534A_GPIO_REG,
F81534A_GPIO_MODE2_DIR);
if (status)
return status;
return f81232_port_probe(port);
}
static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
{
struct usb_serial_port *port = serial->port[0];
@ -942,7 +964,7 @@ static struct usb_serial_driver f81534a_device = {
.tx_empty = f81232_tx_empty,
.process_read_urb = f81534a_process_read_urb,
.read_int_callback = f81232_read_int_callback,
.port_probe = f81232_port_probe,
.port_probe = f81534a_port_probe,
.suspend = f81232_suspend,
.resume = f81232_resume,
};