Commit a49e1abf authored by Mans Rullgard's avatar Mans Rullgard Committed by Johan Hovold
Browse files

USB: serial: cp210x: support all gpios on CP2102N QFN28 package 



The QFN28 package version of the CP2102N has three additional gpio pins.
Add support for these.

Signed-off-by: default avatarMans Rullgard <mans@mansr.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent 49a57857

drivers/usb/serial/cp210x.c

+13 −6
Original line number Diff line number Diff line
@@ -1574,12 +1574,6 @@ static int cp2102n_gpioconf_init(struct usb_serial *serial) 
	if (config_version != 0x01)

		return -ENOTSUPP;



	/*

	 * We only support 4 GPIOs even on the QFN28 package, because

	 * config locations of GPIOs 4-6 determined using reverse

	 * engineering revealed conflicting offsets with other

	 * documented functions. So we'll just play it safe for now.

	 */

	priv->gc.ngpio = 4;



	/*
@@ -1594,6 +1588,19 @@ static int cp2102n_gpioconf_init(struct usb_serial *serial) 
	/* 0 indicates GPIO mode, 1 is alternate function */

	priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;



	if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {

		/*

		 * For the QFN28 package, GPIO4-6 are controlled by

		 * the low three bits of the mode/latch fields.

		 * Contrary to the document linked above, the bits for

		 * the SUSPEND pins are elsewhere.  No alternate

		 * function is available for these pins.

		 */

		priv->gc.ngpio = 7;

		gpio_latch |= (gpio_rst_latch & 7) << 4;

		priv->gpio_pushpull |= (gpio_pushpull & 7) << 4;

	}



	/*

	 * The CP2102N does not strictly has input and output pin modes,

	 * it only knows open-drain and push-pull modes which is set at