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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-28caed64bdasm33128fac.57.2024.10.21.11.17.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 21 Oct 2024 11:17:02 -0700 (PDT) Message-ID: <0a7c5305-b4f7-4166-8a8a-05cf6e3273cc@baylibre.com> Date: Mon, 21 Oct 2024 13:17:01 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/6] iio: adc: ad7606: rework scale-available to be static To: Alexandru Ardelean , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: jic23@kernel.org, krzk+dt@kernel.org, robh@kernel.org, lars@metafoo.de, michael.hennerich@analog.com, gstols@baylibre.com References: <20241021130221.1469099-1-aardelean@baylibre.com> <20241021130221.1469099-5-aardelean@baylibre.com> Content-Language: en-US From: David Lechner In-Reply-To: <20241021130221.1469099-5-aardelean@baylibre.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 10/21/24 8:02 AM, Alexandru Ardelean wrote: > The main driver for this change is the AD7607 part, which has a scale of > "1.220703" for the ±10V range. The AD7607 has a resolution of 14-bits. > > So, just adding the scale-available list for that part would require some > quirks to handle just that scale value. > But to do it more neatly, the best approach is to rework the scale > available lists to have the same format as it is returned to userspace. > That way, we can also get rid of the allocation for the 'scale_avail_show' > array. > > Signed-off-by: Alexandru Ardelean > --- ... > static ssize_t in_voltage_scale_available_show(struct device *dev, > struct device_attribute *attr, > char *buf) > @@ -703,8 +690,16 @@ static ssize_t in_voltage_scale_available_show(struct device *dev, > struct iio_dev *indio_dev = dev_to_iio_dev(dev); > struct ad7606_state *st = iio_priv(indio_dev); > struct ad7606_chan_scale *cs = &st->chan_scales[0]; > + const unsigned int (*vals)[2] = cs->scale_avail; > + unsigned int i; > + size_t len = 0; > > - return ad7606_show_avail(buf, cs->scale_avail, cs->num_scales, true); > + for (i = 0; i < cs->num_scales; i++) > + len += scnprintf(buf + len, PAGE_SIZE - len, "%u.%06u ", > + vals[i][0], vals[i][1]); > + buf[len - 1] = '\n'; > + > + return len; > } > > static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0); Probably a reason for this that I forgot, but why is this handled in a custom attribute instead of ad7606_read_avail()? > @@ -742,6 +737,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, > long mask) > { > struct ad7606_state *st = iio_priv(indio_dev); > + unsigned int scale_avail[AD760X_MAX_SCALES]; Calling this scale_avail_uv would make the code easier for me to understand. > struct ad7606_chan_scale *cs; > int i, ret, ch = 0; > > @@ -752,7 +748,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, > if (st->sw_mode_en) > ch = chan->address; > cs = &st->chan_scales[ch]; > - i = find_closest(val2, cs->scale_avail, cs->num_scales); > + for (i = 0; i < cs->num_scales; i++) { > + scale_avail[i] = cs->scale_avail[i][0] * 1000000 + MICRO > + cs->scale_avail[i][1]; > + } > + val = val * 1000000 + val2; > + i = find_closest(val, scale_avail, cs->num_scales); > ret = st->write_scale(indio_dev, ch, i + cs->reg_offset); > if (ret < 0) > return ret; > @@ -788,9 +789,15 @@ static ssize_t ad7606_oversampling_ratio_avail(struct device *dev, > { > struct iio_dev *indio_dev = dev_to_iio_dev(dev); > struct ad7606_state *st = iio_priv(indio_dev); > + const unsigned int *vals = st->oversampling_avail; > + unsigned int i; > + size_t len = 0; > > - return ad7606_show_avail(buf, st->oversampling_avail, > - st->num_os_ratios, false); > + for (i = 0; i < st->num_os_ratios; i++) > + len += scnprintf(buf + len, PAGE_SIZE - len, "%u ", vals[i]); > + buf[len - 1] = '\n'; > + > + return len; > } > > static IIO_DEVICE_ATTR(oversampling_ratio_available, 0444, Same question about ad7606_read_avail() instead for this one.