Re: spi-devel-general Digest, Vol 45, Issue 15

Re: spi-devel-general Digest, Vol 45, Issue 15

[arjun rath]

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Hi all,

Thanks to all for the suggestions.

But whatever driver for ADC i am getting is through I2C connected only.Like
any other spi slave driver,i added for my spi device also and the device is
opening also.But now i am trying how to read the data which i am not
getting.



On Sun, Feb 14, 2010 at 12:02 AM, <
spi-devel-general-request-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> wrote:

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> Today's Topics:
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>   1. SPI-ADC (arjun rath)
>   2. Re: SPI-ADC (Ben Gamari)
>   3. Re: SPI-ADC (Linus Walleij)
>   4. [SPAM] ???????????????? ??????????? ?????
>      ( ??????????????? ???????? )
>   5. Re: SPI-ADC (Jonathan Cameron)
>   6. Re: SPI-ADC (Mike Frysinger)
>   7. [SPAM] Offert : notre guide pour mieux gerer      votre epargne et
>      developper votre patrimoine (Immo-web)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Sat, 13 Feb 2010 11:18:40 +0530
> From: arjun rath <rath.arjun-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Subject: [spi-devel-general] SPI-ADC
> To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Message-ID:
>        <dc6d3181002122148v6451ebffka164de288738485d-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi everybody,
>
> can anybody share how to start a spi based ADC linux driver.I am having a
> MAXIM 1242 ADC chip.
>
> Can anybody share some reference driver for the same chip
>
> Thanks in advance
>
> Arjun
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> Message: 2
> Date: Sat, 13 Feb 2010 01:38:16 -0500
> From: Ben Gamari <bgamari-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Subject: Re: [spi-devel-general] SPI-ADC
> To: spi-devel-general <spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> Message-ID: <1266042736-sup-3579@ben-laptop>
> Content-Type: text/plain; charset=UTF-8
>
> Excerpts from arjun rath's message of Sat Feb 13 00:48:40 -0500 2010:
> > Hi everybody,
> >
> > can anybody share how to start a spi based ADC linux driver.I am having a
> > MAXIM 1242 ADC chip.
> >
> > Can anybody share some reference driver for the same chip
> >
> I've recently been working on a design for a data acquisition
> board to interface with the Beagle Board using the Maxim 5134 and 1270.
> I'm using the spidev driver to interface with the devices from
> user-space. Documentation on this driver can be found in the
> Documentation/spi/spidev file of the Linux kernel tree. My code can be
> found at [1]. Hope things are going well,
>
> - Ben
>
>
> [1] http://goldnerlab.physics.umass.edu/git?p=tracker.git;a=tree
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sat, 13 Feb 2010 14:48:22 +0100
> From: Linus Walleij <linus.ml.walleij-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Subject: Re: [spi-devel-general] SPI-ADC
> To: arjun rath <rath.arjun-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,    linux kernel
>        <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
> Message-ID:
>        <63386a3d1002130548y7c839072y85097a9bcdf66cad-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
> Content-Type: text/plain; charset=UTF-8
>
> 2010/2/13 arjun rath <rath.arjun-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>
> > can anybody share how to start a spi based ADC linux driver.I am having a
> > MAXIM 1242 ADC chip.
>
> The ?ernel does not contain any generic ADC subsystem abstraction (I
> think it would be good if it did), instead most drivers using ADC have
> their ADC portions stored inside a driver for something else, e.g.
> drivers/hwmon for ADCs used in temperature monitoring, or
> drivers/power for ADCs used in monitoring of currents and voltages
> for power supplies/batteries.
>
> This is a bit bad for driving a generic ADC like this using spidev and,
> even if it was to be accessed from userspace only, having it under
> drivers/spi is rather counterintuitive, what happens when the next ADC
> using I2C turns up? drivers/i2c/chips?
>
> I would suggest creating subsystem drivers/adc if you have time and
> energy, other ideas?
>
> Linus Walleij
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sat, 13 Feb 2010 18:18:04 +0300
> From: " ??????????????? ???????? "      <debywepocehugaly-oe7qfRrRQfd4OK5fxMSSsQ@public.gmane.org>
> Subject: [spi-devel-general] [SPAM] ???????????????? ??????????? ?????
> To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Message-ID: <1162144242.20100213181804-oe7qfRrRQfd4OK5fxMSSsQ@public.gmane.org>
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> Underqzi
> 6ED
> aqqnzYofJmhldeH
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> Message: 5
> Date: Sat, 13 Feb 2010 16:51:58 +0000
> From: Jonathan Cameron <kernel-tko9wxEg+fIOOJlXag/Snyp2UmYkHbXO@public.gmane.org>
> Subject: Re: [spi-devel-general] SPI-ADC
> To: Linus Walleij <linus.ml.walleij-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,    linux kernel
>        <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, arjun rath <rath.arjun-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Message-ID: <4B76D8AE.7040102-tko9wxEg+fIOOJlXag/Snyp2UmYkHbXO@public.gmane.org>
> Content-Type: text/plain; charset=UTF-8
>
> Hi Arjun and Linus,
> >
> >> can anybody share how to start a spi based ADC linux driver.I am having
> a
> >> MAXIM 1242 ADC chip.
> >
> > The ?ernel does not contain any generic ADC subsystem abstraction (I
> > think it would be good if it did), instead most drivers using ADC have
> > their ADC portions stored inside a driver for something else, e.g.
> > drivers/hwmon for ADCs used in temperature monitoring, or
> > drivers/power for ADCs used in monitoring of currents and voltages
> > for power supplies/batteries.
> That's not entirely true.  These are covered by the IIO subsystem which
> is admittedly currently in staging as some elements still need cleaning up.
>
> As a quick summary of IIO.  Except for a few bits of management code, basic
> drivers look pretty much like hwmon.  An example in tree is the tsl2563
> driver
> (under drivers/staging/iio/light) though that one is moving out to ALS when
> Amit has a chance to sort out the relevant patch.
>
> For more advanced drivers (only add support if you have a use as it is a
> fair
> bit more complex) we have support for hardware and software ring buffers,
> an
> events interface which is more or less the equivalent of input without
> cross
> device aggregation.
>
> ADC drivers are under drivers/staging/iio/adc.
>
> I think in mainline we still only have a max1363 driver which covers a lot
> of the i2c maxim parts (more to add after testing).  There are a couple
> more iio using adc drivers in a blackfin tree at:
>
> http://blackfin.uclinux.org/gf/project/linux-kernel/scmsvn/
> (Note these are very much under development!)  Though from a quick look
> all of them are i2c based.  For an spi equivalent, take a look at
> drivers/staging/iio/accel/ where we have the kxsd9 driver (which is another
> simple example of an IIO driver) + lis3l02dq and sca3000 which are on the
> heavy side (probably not a good place to start).
>
> For a general list of devices people are working on, or at least have and
> intend to work on, take a look at:
>
> https://sourceforge.net/apps/mediawiki/iioutils/index.php?title=Device_List
>
> Just for reference, the big up coming change in IIO is a new userspace ABI
> to clean things up before we get too many drivers using the somewhat messy
> old version.
>
> It will still be a little while before we have cleaned up the more
> controversial
> issues in the core (none of which touch on the simpler drivers) but with a
> steady increase in active developers things are speeding up.
>
> So in conclusion, if your use of the driver doesn't fall neatly under hwmon
> or elsewhere, and you don't mind writing for a subsystem which isn't
> entirely
> polished and may change, then IIO might be what you are looking for.
>
> Currently all discussions take place on LKML, but we are working on a more
> focused alternative list which I'll announce once it is sorted out.
>
> Just taking a quick and dirty look at the datasheet for the MAX1242:
>
> * You might have fun getting the required conversion delay before a read.
>  (Chip select must be enabled for 7.5 microsecs before the clock starts)
>
> * Otherwise it is a nice simple chip with no actual control of anything.
>
> Perhaps you can supply some information on your application to guide
> an continuation of this discussion?
>
> Thanks,
>
>
>
> Jonathan Cameron
> >
> > This is a bit bad for driving a generic ADC like this using spidev and,
> > even if it was to be accessed from userspace only, having it under
> > drivers/spi is rather counterintuitive, what happens when the next ADC
> > using I2C turns up? drivers/i2c/chips?
> >
> > I would suggest creating subsystem drivers/adc if you have time and
> > energy, other ideas?
> >
> > Linus Walleij
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel"
> in
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>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Sat, 13 Feb 2010 12:03:17 -0500
> From: Mike Frysinger <vapier.adi-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Subject: Re: [spi-devel-general] SPI-ADC
> To: Jonathan Cameron <kernel-tko9wxEg+fIOOJlXag/Snyp2UmYkHbXO@public.gmane.org>
> Cc: linux kernel <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,        arjun rath
>        <rath.arjun-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Message-ID:
>        <8bd0f97a1002130903h698c8d4ax4b3b9bfff02157b7-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
> Content-Type: text/plain; charset=UTF-8
>
> On Sat, Feb 13, 2010 at 11:51, Jonathan Cameron wrote:
> > http://blackfin.uclinux.org/gf/project/linux-kernel/scmsvn/
>
> people who like git can always use:
>
> http://blackfin.uclinux.org/git/?p=readonly-mirrors/linux-kernel.git;a=summary
> -mike<http://blackfin.uclinux.org/git/?p=readonly-mirrors/linux-kernel.git;a=summary%0A-mike>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Sat, 13 Feb 2010 19:32:10 +0100 (CET)
> From: "Immo-web" <privileges-BQzCAz/s1vZLBLenUCvkVg@public.gmane.org>
> Subject: [spi-devel-general] [SPAM] Offert : notre guide pour mieux
>        gerer   votre epargne et developper votre patrimoine
> To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Message-ID: <kxsm5l.me49qn-4StZXCDRhwPgrAmjdVbZJQ@public.gmane.org>
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> End of spi-devel-general Digest, Vol 45, Issue 15
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