linux-kernel - Re: [PATCH] mfd: mc13xxx: Add mc34708 adc support

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Message-ID: <20180412164501.66b50f81@jawa>
Date:   Thu, 12 Apr 2018 16:45:01 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Joe Perches <joe@...ches.com>
Cc:     Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH] mfd: mc13xxx: Add mc34708 adc support

Hi Joe,

> On Wed, 2018-04-11 at 16:09 +0200, Lukasz Majewski wrote:
> > From: Sascha Hauer <s.hauer@...gutronix.de>
> > 
> > The mc34708 has an improved adc. The older variants will always
> > convert a fixed order of channels. The mc34708 can do up to eight
> > conversions in arbitrary channel order. Currently this extended
> > feature is not supported. We only support touchscreen conversions
> > now, which will be sampled in a data format compatible to the older
> > chips in order to keep the API between the mfd and the touchscreen
> > driver.  
> []
> > diff --git a/drivers/mfd/mc13xxx-core.c
> > b/drivers/mfd/mc13xxx-core.c  
> []
> > +static int mc34708_adc_conversion(struct mc13xxx *mc13xxx,
> > unsigned int mode,
> > +		unsigned int channel, u8 ato, bool atox,
> > +		unsigned int *sample)
> > +{
> > +	int ret, i;  
> []
> > +	if (mc13xxx->adcflags & MC13XXX_ADC_WORKING) {
> > +		ret = -EBUSY;
> > +		goto out;
> > +	}  
> 
> This doesn't work.
> 
> > []
> > +	mc13xxx_irq_free(mc13xxx, MC34708_IRQ_TSDONE,
> > &adcdone_data); +
> > +	if (!ret) {
> > +		ret = -ETIMEDOUT;
> > +		goto out;
> > +	}  
> []
> > +out:
> > +	ret = mc13xxx_reg_write(mc13xxx, MC13XXX_ADC0, old_adc0);  
> 
> ret is reassigned here, so the ret = -<FOO>
> uses above don't do what is expected.

Right. Thanks for spotting this. I will fix it in v2.

> 
> > +
> > +	mc13xxx->adcflags &= ~MC13XXX_ADC_WORKING;
> > +	mc13xxx_unlock(mc13xxx);
> > +
> > +	return ret;
> > +}  
> 




Best regards,

Lukasz Majewski

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