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USB: serial: ftdi_sio: add support for FT232H CBUS gpios 

Enable support for cbus gpios on FT232H. The cbus configuration is
stored in two words in the EEPROM at byte-offset 0x1a with the mux
config for ACBUS5, ACBUS6, ACBUS8 and ACBUS9 (only pins that can be
configured as I/O mode).

Tested using FT232H by configuring one ACBUS pin at a time.

Reviewed-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Matthew Michilot <matthew.michilot@gmail.com>
[ johan: fix copy-paste error in commit message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Matthew Michilot 2019-08-15 17:40:54 +00:00 committed by Johan Hovold
parent d1abaeb3be
commit 7a786b8479
1 changed files with 43 additions and 0 deletions
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43
drivers/usb/serial/ftdi_sio.c
View File

@ -2023,6 +2023,46 @@ static int ftdi_read_eeprom(struct usb_serial *serial, void *dst, u16 addr,
return 0;
}
static int ftdi_gpio_init_ft232h(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(4, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = ftdi_read_eeprom(port->serial, buf, 0x1a, 4);
if (ret < 0)
goto out_free;
/*
* FT232H CBUS Memory Map
*
* 0x1a: X- (upper nibble -> AC5)
* 0x1b: -X (lower nibble -> AC6)
* 0x1c: XX (upper nibble -> AC9 | lower nibble -> AC8)
*/
cbus_config = buf[2] << 8 | (buf[1] & 0xf) << 4 | (buf[0] & 0xf0) >> 4;
priv->gc.ngpio = 4;
priv->gpio_altfunc = 0xff;
for (i = 0; i < priv->gc.ngpio; ++i) {
if ((cbus_config & 0xf) == FTDI_FTX_CBUS_MUX_GPIO)
priv->gpio_altfunc &= ~BIT(i);
cbus_config >>= 4;
}
out_free:
kfree(buf);
return ret;
}
static int ftdi_gpio_init_ft232r(struct usb_serial_port *port)
{
struct ftdi_private *priv = usb_get_serial_port_data(port);
@ -2098,6 +2138,9 @@ static int ftdi_gpio_init(struct usb_serial_port *port)
int result;
switch (priv->chip_type) {
case FT232H:
result = ftdi_gpio_init_ft232h(port);
break;
case FT232RL:
result = ftdi_gpio_init_ft232r(port);
break;