linux-kernel - Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support

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Date:	Mon, 8 Feb 2016 11:25:00 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Michael Welling <mwelling@...e.org>
Cc:	Daniel Baluta <daniel.baluta@...el.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	Lucas De Marchi <lucas.demarchi@...el.com>,
	Andy Gross <agross@...eaurora.org>,
	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Guenter Roeck <linux@...ck-us.net>, eibach@...ys.de,
	Sricharan R <sricharan@...eaurora.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support

On Fri, Feb 05, 2016 at 06:32:45PM -0600, Michael Welling wrote:
> On Fri, Feb 05, 2016 at 09:32:34PM +0200, Daniel Baluta wrote:
> > >> +static int ads1015_read_raw(struct iio_dev *indio_dev,
> > >> +                         struct iio_chan_spec const *chan, int *val,
> > >> +                         int *val2, long mask)
> > >> +{
> > >> +     int ret, idx;
> > >> +     struct ads1015_data *data = iio_priv(indio_dev);
> > >> +
> > >> +     mutex_lock(&data->lock);
> > >> +     switch (mask) {
> > >> +     case IIO_CHAN_INFO_RAW:
> > >> +             if (iio_buffer_enabled(indio_dev)) {
> > >> +                     ret = -EBUSY;
> > >> +                     break;
> > >> +             }
> > >> +
> > >> +             ret = ads1015_set_power_state(data, true);
> > >> +             if (ret < 0)
> > >> +                     break;
> > >
> > > Just tested the driver on a Dragonboard 410C with a robotics mezzanine that I
> > > designed.
> > >
> > > The above ads1015_set_power_state(data, true) is always returning -EINVAL.
> > >
> > > Any ideas why that would be happening?
> > > I think it may be the return from pm_runtime_get_sync?
> > 
> > Can you confirm that pm_runtime_get_sync fails? Using some printk?
> > 
> > Also adding printks in suspend/resume function would be helpful. Do
> > you have CONFIG_PM enabled?
> >
> 
> Indeed it is the pm_runtime_get_sync that fails with a -EINVAL.
> 
> > >
> > > When I comment out the break the readings come back but are not updated continually.
> > > If I read in_voltage0-voltage1_raw then in_voltage0_raw the value is updated.
> > 
> > I guess this is normal if set_power_state fails.
> 
> The hwmod driver works fine BTW.
> 
> My guess is there is an issue with the qup i2c driver seeing as it has worked on
> other system without issue.
> 
> CC'd some the latest developer on the qup i2c driver.
> 
> I2C guys have any ideas on this?
> 

Adding some more people who recently worked on this. Might be nice to
know which kernel version you are using.

> > 
> > thanks,
> > Daniel.

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