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USB: serial: ftdi_sio: report the valid GPIO lines to gpiolib

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Since it is pretty common for only some of the CBUS lines to be
valid as GPIO lines, let's report such validity to the rest of
the kernel.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201204164739.781812-3-maz@kernel.org
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Marc Zyngier 2020-12-04 16:47:37 +00:00 committed by Johan Hovold
parent a251963f76
commit 11fb08cffb
1 changed files with 14 additions and 0 deletions
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14
drivers/usb/serial/ftdi_sio.c
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@ -2002,6 +2002,19 @@ static int ftdi_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio,
return result;
}
static int ftdi_gpio_init_valid_mask(struct gpio_chip *gc,
unsigned long *valid_mask,
unsigned int ngpios)
{
struct usb_serial_port *port = gpiochip_get_data(gc);
struct ftdi_private *priv = usb_get_serial_port_data(port);
unsigned long map = priv->gpio_altfunc;
bitmap_complement(valid_mask, &map, ngpios);
return 0;
}
static int ftdi_read_eeprom(struct usb_serial *serial, void *dst, u16 addr,
u16 nbytes)
{
@ -2173,6 +2186,7 @@ static int ftdi_gpio_init(struct usb_serial_port *port)
priv->gc.get_direction = ftdi_gpio_direction_get;
priv->gc.direction_input = ftdi_gpio_direction_input;
priv->gc.direction_output = ftdi_gpio_direction_output;
priv->gc.init_valid_mask = ftdi_gpio_init_valid_mask;
priv->gc.get = ftdi_gpio_get;
priv->gc.set = ftdi_gpio_set;
priv->gc.get_multiple = ftdi_gpio_get_multiple;