From 11fb08cffbebcbda76b3d882c19398c7571ab355 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 4 Dec 2020 16:47:37 +0000 Subject: USB: serial: ftdi_sio: report the valid GPIO lines to gpiolib 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 Link: https://lore.kernel.org/r/20201204164739.781812-3-maz@kernel.org Reviewed-by: Andy Shevchenko Reviewed-by: Linus Walleij Signed-off-by: Johan Hovold --- drivers/usb/serial/ftdi_sio.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'drivers/usb') diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index e0f4c3d9649c..13e575f16bcd 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -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; -- cgit v1.2.3