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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: Johan Hovold <johan@kernel.org>
hifive-unleashed-5.1
Johan Hovold 2018-09-30 14:27:03 +02:00
parent e0658e3074
commit ff32d97e39
2 changed files with 40 additions and 3 deletions
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40
drivers/usb/serial/ftdi_sio.c
View File

@ -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;

3
drivers/usb/serial/ftdi_sio.h
View File

@ -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