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Date: Mon, 3 Jun 2024 19:39:46 +0300
From: "Ceclan, Dumitru" <mitrutzceclan@...il.com>
To: David Lechner <dlechner@...libre.com>, Nuno Sá
<noname.nuno@...il.com>, Jonathan Cameron <jic23@...nel.org>,
Dumitru Ceclan via B4 Relay <devnull+dumitru.ceclan.analog.com@...nel.org>
Cc: dumitru.ceclan@...log.com, Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/6] iio: adc: ad7173: refactor ain and vref selection
On 03/06/2024 19:00, David Lechner wrote:
> On 6/3/24 8:08 AM, Ceclan, Dumitru wrote:
>> On 03/06/2024 16:00, Nuno Sá wrote:
>>> On Sat, 2024-06-01 at 19:49 +0100, Jonathan Cameron wrote:
>>>> On Fri, 31 May 2024 22:42:29 +0300
>>>> Dumitru Ceclan via B4 Relay <devnull+dumitru.ceclan.analog.com@...nel.org> wrote:
>>>>
>>>>> From: Dumitru Ceclan <dumitru.ceclan@...log.com>
>>>>>
>>>>> Move validation of analog inputs and reference voltage selection to
>>>>> separate functions to reduce the size of the channel config parsing
>>>>> function and improve readability.
>>>>> Add defines for the number of analog inputs in a channel.
>>>>>
>>>>> Reviewed-by: David Lechner <dlechner@...libre.com>
>>>>> Signed-off-by: Dumitru Ceclan <dumitru.ceclan@...log.com>
>>>>> ---
>>>>> drivers/iio/adc/ad7173.c | 71 ++++++++++++++++++++++++++++++++++--------------
>>>>> 1 file changed, 50 insertions(+), 21 deletions(-)
>>>>>
>>>>> diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
>>>>> index 6e249628bc64..a20831d99aa5 100644
>>>>> --- a/drivers/iio/adc/ad7173.c
>>>>> +++ b/drivers/iio/adc/ad7173.c
>>>>> @@ -60,6 +60,7 @@
>>>>> #define AD7173_CH_SETUP_AINPOS_MASK GENMASK(9, 5)
>>>>> #define AD7173_CH_SETUP_AINNEG_MASK GENMASK(4, 0)
>>>>>
>>>>> +#define AD7173_NO_AINS_PER_CHANNEL 2
>>>>> #define AD7173_CH_ADDRESS(pos, neg) \
>>>>> (FIELD_PREP(AD7173_CH_SETUP_AINPOS_MASK, pos) | \
>>>>> FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))
>>>>> @@ -623,6 +624,7 @@ static int ad7173_setup(struct iio_dev *indio_dev)
>>>>> static unsigned int ad7173_get_ref_voltage_milli(struct ad7173_state *st,
>>>>> u8 reference_select)
>>>>> {
>>>>> + struct device *dev = &st->sd.spi->dev;
>>>>> int vref;
>>>>>
>>>>> switch (reference_select) {
>>>>> @@ -646,9 +648,11 @@ static unsigned int ad7173_get_ref_voltage_milli(struct
>>>>> ad7173_state *st,
>>>>> return -EINVAL;
>>>>> }
>>>>>
>>>>> - if (vref < 0)
>>>>> + if (vref < 0) {
>>>>> + dev_err(dev, "Cannot use reference %u. Error:%d\n",
>>>>> + reference_select, vref);
>>>>> return vref;
>>>>> -
>>>>> + }
>>>>> return vref / (MICRO / MILLI);
>>>>> }
>>>>>
>>>>> @@ -905,13 +909,50 @@ static int ad7173_register_clk_provider(struct iio_dev
>>>>> *indio_dev)
>>>>> &st->int_clk_hw);
>>>>> }
>>>>>
>>>>> +static int ad7173_validate_voltage_ain_inputs(struct ad7173_state *st,
>>>>> + const unsigned int
>>>>> ain[AD7173_NO_AINS_PER_CHANNEL])
>>>> I was late to the game in replying to previous thread.
>>>>
>>>> This is neater without the loop and with 2 parameters. Anyhow see reply to v3.
>>>>
>>>
>>> Yeps, even more given that we're passing/copying the complete array which always
>>> fells awkward to me :)
>>>
>>> - Nuno Sá
>>>
>>>
>>
>> I rewrote the function, but it feels a bit awkward, perhaps I could get a bit of
>> advice before sending V5:
>
> Maybe we could make this easier to read with macros?
>
>>
>> static int ad7173_validate_voltage_ain_inputs(struct ad7173_state *st,
>> unsigned int ain0, unsigned int ain1)
>> {
>> struct device *dev = &st->sd.spi->dev;
>> bool special_input0, special_input1;
>>
>> special_input0 = ain0 == AD7173_AIN_REF_POS || ain0 == AD7173_AIN_REF_NEG ||
>> ((ain0 == AD7173_AIN_COM_IN_POS || ain0 == AD7173_AIN_COM_IN_NEG) &&
>> (st->info->has_common_input)) || ain0 == AD4111_VINCOM_INPUT;
>> special_input1 = (ain1 == AD7173_AIN_REF_POS || ain1 == AD7173_AIN_REF_NEG) ||
>> ((ain1 == AD7173_AIN_COM_IN_POS || ain1 == AD7173_AIN_COM_IN_NEG) &&
>> (st->info->has_common_input)) || ain1 == AD4111_VINCOM_INPUT;
>>
>
> special_input0 = AD7173_IS_SPECIAL_INPUT(ain0);
> special_input1 = AD7173_IS_SPECIAL_INPUT(ain1);
>
>> if (st->info->has_vincom_input) {
>> if (ain0 == AD4111_VINCOM_INPUT &&
>> ain1 < st->info->num_voltage_in && /* Normal input */
>> ain1 >= st->info->num_voltage_in_div) /* Input without divider */
>> return dev_err_probe(dev, -EINVAL,
>> "VINCOM must be paired with inputs having divider.\n");
>>
>> if (ain1 == AD4111_VINCOM_INPUT &&
>> ain0 < st->info->num_voltage_in && /* Normal input */
>> ain0 >= st->info->num_voltage_in_div) /* Input without divider */
>> return dev_err_probe(dev, -EINVAL,
>> "VINCOM must be paired with inputs having divider.\n");
>
> if (AD7173_IS_VINCOM_MISMATCH(ain0, ain1) ||
> AD7173_IS_VINCOM_MISMATCH(ain1, ain0)) {
> return dev_err_probe(dev, -EINVAL,
> "VINCOM must be paired with inputs having divider.\n");
>
>> }
>>
>> if ((ain0 >= st->info->num_voltage_in && !special_input0) ||
>> (ain1 >= st->info->num_voltage_in && !special_input1))
>> return dev_err_probe(dev, -EINVAL,
>> "Input pin number out of range for pair (%d %d).\n",
>> ain0, ain1);
>>
>> if (!special_input0 && !special_input1 &&
>> ((ain0 >= st->info->num_voltage_in_div) !=
>> (ain1 >= st->info->num_voltage_in_div)))
>> return dev_err_probe(dev, -EINVAL,
>> "Both inputs must either have a voltage divider or not have: (%d %d).\n",
>> ain0, ain1);
>
> These last two don't seem so bad.
>
>>
Thanks for the quick review :)
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