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

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

Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Mans Rullgard 2019-01-24 13:48:39 +00:00 committed by Johan Hovold
parent 49a57857ae
commit a49e1abf07
1 changed files with 13 additions and 6 deletions
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19
drivers/usb/serial/cp210x.c
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@ -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