linux-kernel - Re: [PATCH V5 2/3] gpio: Add support for Intel ICHx/3100/Series[56] GPIO

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Date:	Tue, 21 Feb 2012 11:25:13 -0600 (CST)
From:	Aaron Sierra <asierra@...-inc.com>
To:	Guenter Roeck <guenter@...ck-us.net>
Cc:	Peter Tyser <ptyser@...-inc.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH V5 2/3] gpio: Add support for Intel  ICHx/3100/Series[56] GPIO

> >+static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
> >+{
> >+       unsigned long flags;
> >+       u32 data;
> >+
> >+       /*
> >+       * GPI 0 - 15 need to be read from the power management
> >registers on
> >+       * a ICH6/3100 bridge.
> >+       */
> >+       if (nr < 16 && ichx_priv.pm_base) {
> >+               spin_lock_irqsave(&ichx_priv.lock, flags);
> >+
> >+               /* GPI 0 - 15 are latched, write 1 to clear*/
> >+               ICHX_WRITE(1 << (16 + nr), 0, ichx_priv.pm_base);
> >+               data = ICHX_READ(0, ichx_priv.pm_base);
> >+
> >+               spin_unlock_irqrestore(&ichx_priv.lock, flags);
> >+
> >+               return (data >> 16) & (1 << nr) ? 1 : 0;
> >+       } else {
> 
> 
> unless I am missing something, this still does not address the error
> case where pm_base is not set because of an ACPI conflict (.uses_gpe0
> is true, but .pm_base is NULL).
> 
> Not sure what to do in that case, but simply calling ichx_gpio_get
> doesn't seem to be the correct solution.

Guenter,
You're right. That doesn't do what I'd intended, but this should do the
trick:

	...

	* a ICH6/3100 bridge.
	*/
	if (nr < 16) {
		if (!ichx_priv.pm_base)
			return -ENXIO;

	...

Any other concerns?

> >+               return ichx_gpio_get(chip, nr);
> >+       }
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