diff options
| author | Ji-Ze Hong (Peter Hong) <hpeter@gmail.com> | 2020-01-30 13:47:51 +0800 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2020-02-25 12:30:20 +0100 |
| commit | 0a68ec3d8a2ce75666b813b90cbf1d2e85684714 (patch) | |
| tree | 5c874c581ff28e519ea35b4245869ca08a85a1d9 /drivers/usb/serial | |
| parent | 11301d41ab9a043c20e9b1b79f8754a15dc21ef0 (diff) | |
USB: serial: f81232: set F81534A serial port with RS232 mode
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>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/f81232.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c index 7200771897ed..d27876e64e9d 100644 --- a/drivers/usb/serial/f81232.c +++ b/drivers/usb/serial/f81232.c @@ -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, }; |