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Commit ff32d97e authored by Johan Hovold's avatar Johan Hovold
Browse files

USB: serial: ftdi_sio: add support for FT232R CBUS gpios 



Enable support for cbus gpios on FT232R. The cbus configuration is
stored in one word in the EEPROM at offset 0x0a (byte-offset 0x14) with
the mux config for CBUS0, CBUS1, CBUS2 and CBUS3 in bits 0..3, 4..7,
8..11 and 12..15, respectively.

Tested using FT232RL by configuring one cbus pin at a time.

Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent e0658e30

drivers/usb/serial/ftdi_sio.c

+38 −2
Original line number Diff line number Diff line
@@ -2007,7 +2007,40 @@ static int ftdi_read_eeprom(struct usb_serial *serial, void *dst, u16 addr, 
	return 0;

}



static int ftx_gpioconf_init(struct usb_serial_port *port)

static int ftdi_gpio_init_ft232r(struct usb_serial_port *port)

{

	struct ftdi_private *priv = usb_get_serial_port_data(port);

	u16 cbus_config;

	u8 *buf;

	int ret;

	int i;



	buf = kmalloc(2, GFP_KERNEL);

	if (!buf)

		return -ENOMEM;



	ret = ftdi_read_eeprom(port->serial, buf, 0x14, 2);

	if (ret < 0)

		goto out_free;



	cbus_config = le16_to_cpup((__le16 *)buf);

	dev_dbg(&port->dev, "cbus_config = 0x%04x\n", cbus_config);



	priv->gc.ngpio = 4;



	priv->gpio_altfunc = 0xff;

	for (i = 0; i < priv->gc.ngpio; ++i) {

		if ((cbus_config & 0xf) == FTDI_FT232R_CBUS_MUX_GPIO)

			priv->gpio_altfunc &= ~BIT(i);

		cbus_config >>= 4;

	}

out_free:

	kfree(buf);



	return ret;

}



static int ftdi_gpio_init_ftx(struct usb_serial_port *port)

{

	struct ftdi_private *priv = usb_get_serial_port_data(port);

	struct usb_serial *serial = port->serial;
@@ -2049,8 +2082,11 @@ static int ftdi_gpio_init(struct usb_serial_port *port) 
	int result;



	switch (priv->chip_type) {

	case FT232RL:

		result = ftdi_gpio_init_ft232r(port);

		break;

	case FTX:

		result = ftx_gpioconf_init(port);

		result = ftdi_gpio_init_ftx(port);

		break;

	default:

		return 0;

drivers/usb/serial/ftdi_sio.h

+2 −1
Original line number Diff line number Diff line
@@ -457,7 +457,8 @@ enum ftdi_sio_baudrate { 
#define FTDI_SIO_READ_EEPROM_REQUEST_TYPE 0xc0

#define FTDI_SIO_READ_EEPROM_REQUEST FTDI_SIO_READ_EEPROM



#define FTDI_FTX_CBUS_MUX_GPIO		8

#define FTDI_FTX_CBUS_MUX_GPIO		0x8

#define FTDI_FT232R_CBUS_MUX_GPIO	0xa





/* Descriptors returned by the device