linux-kernel - Re: [PATCH v2 3/4] iio: accel: adxl345: Setup DATA

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Date:   Fri, 5 May 2017 19:26:06 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-iio@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Daniel Baluta <daniel.baluta@...il.com>,
        Alison Schofield <amsfield22@...il.com>,
        Florian Vaussard <florian.vaussard@...g-vd.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] iio: accel: adxl345: Setup DATA_READY trigger

On 02/05/17 13:15, Eva Rachel Retuya wrote:
> On Mon, May 01, 2017 at 02:31:00PM +0300, Andy Shevchenko wrote:
> [...]
>>> -int adxl345_core_probe(struct device *dev, struct regmap *regmap,
>>> +int adxl345_core_probe(struct device *dev, struct regmap *regmap, int irq,
>>>                        const char *name);
>>
>> I think I commented this once. Instead of increasing parameters,
>> please introduce a new struct (as separate preparatory patch) which
>> will hold current parameters. Let's call it
>> strut adxl345_chip {
>>  struct device *dev;
>>  struct regmap *regmap;
>>  const char *name;
>> };
>>
>> I insisnt in this chage.
> 
> I'm not sure if what you want is more simpler, is it something like what
> this driver does?
> 
> http://lxr.free-electrons.com/source/drivers/iio/gyro/mpu3050.h#L41
> http://lxr.free-electrons.com/source/drivers/iio/gyro/mpu3050-i2c.c#L34
> 
>>
>>>  #include <linux/delay.h>
>>> +#include <linux/interrupt.h>
>>>  #include <linux/module.h>
>>
>>> +#include <linux/of_irq.h>
>>
>> Can we get rid of gnostic resource providers?
>>
> 
> I'm uninformed and still learning. Please let me know how to approach
> this in some other way.
> 
>>> +static const struct iio_trigger_ops adxl345_trigger_ops = {
>>
>>> +       .owner = THIS_MODULE,
>>
>> Do we still need this kind of lines?
>>
> 
> I'm not sure either.
> Jonathan, is it OK to omit this and also the one below?
No it's not.  There are ways avoiding the necessity of specifying this
via some macro magic.  It could be done easily enough but hasn't been
yet.

> 
>>> +       .set_trigger_state = adxl345_drdy_trigger_set_state,
>>> +};
>>
>>>  static const struct iio_info adxl345_info = {
>>
>>>         .driver_module  = THIS_MODULE,
>>
>> Ditto, though it's in the current code.
Same issue.  Could be fixed, but right now you need them.

Patches welcome ;)  Basic eventual aim would be to drop
these fields from the structures entirely but obviously
there would have to be some intermediate steps.>
>>>         .read_raw       = adxl345_read_raw,
>>>  };
>>
>>> +       /*
>>> +        * Any bits set to 0 send their respective interrupts to the INT1 pin,
>>> +        * whereas bits set to 1 send their respective interrupts to the INT2
>>> +        * pin. Map all interrupts to the specified pin.
>>> +        */
>>> +       of_irq = of_irq_get_byname(dev->of_node, "INT2");
>>
>> So, can we get it in resourse provider agnostic way?
>>
>>> +       if (of_irq == irq)
>>> +               regval = 0xFF;
>>> +       else
>>> +               regval = 0x00;
>>
>> regval = of_irq == irq ? 0xff : 0x00; ?
>>
> 
> OK.
> 
> Thanks,
> Eva
> 
>>> +
>>> +       ret = regmap_write(data->regmap, ADXL345_REG_INT_MAP, regval);
>>> +       if (ret < 0) {
>>> +               dev_err(dev, "Failed to set up interrupts: %d\n", ret);
>>> +               return ret;
>>> +       }
>>
>> -- 
>> With Best Regards,
>> Andy Shevchenko