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staging:iio:adc:ad7152: Update sample rate, conversion time, digital filter handling

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Rename attribute, use sampling_frequency instead.
Attribute now accepts values in Hz.
Delay readout accordingly.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich 2011-09-02 17:25:30 +01:00 committed by Greg Kroah-Hartman
parent bb90cf8d7b
commit c3b7915df6
1 changed files with 31 additions and 12 deletions
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43
drivers/staging/iio/adc/ad7152.c
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@ -67,6 +67,9 @@
#define AD7152_CAPDAC_DACEN (1 << 7)
#define AD7152_CAPDAC_DACP(x) ((x) & 0x1F)
/* CFG2 Register Bit Designations (AD7152_REG_CFG2) */
#define AD7152_CFG2_OSR(x) (((x) & 0x3) << 4)
enum {
AD7152_DATA,
AD7152_OFFS,
@ -157,8 +160,10 @@ static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
S_IWUSR, NULL, ad7152_start_gain_calib, 1);
#define IIO_DEV_ATTR_FILTER_RATE_SETUP(_mode, _show, _store) \
IIO_DEVICE_ATTR(filter_rate_setup, _mode, _show, _store, 0)
/* Values are Update Rate (Hz), Conversion Time (ms) */
static const unsigned char ad7152_filter_rate_table[][2] = {
{200, 5}, {50, 20}, {20, 50}, {17, 60},
};
static ssize_t ad7152_show_filter_rate_setup(struct device *dev,
struct device_attribute *attr,
@ -167,7 +172,8 @@ static ssize_t ad7152_show_filter_rate_setup(struct device *dev,
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = iio_priv(indio_dev);
return sprintf(buf, "0x%02x\n", chip->filter_rate_setup);
return sprintf(buf, "%d\n",
ad7152_filter_rate_table[chip->filter_rate_setup][0]);
}
static ssize_t ad7152_store_filter_rate_setup(struct device *dev,
@ -178,37 +184,50 @@ static ssize_t ad7152_store_filter_rate_setup(struct device *dev,
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = iio_priv(indio_dev);
u8 data;
int ret;
int ret, i;
ret = kstrtou8(buf, 10, &data);
if (ret < 0)
return ret;
mutex_lock(&indio_dev->mlock);
ret = i2c_smbus_write_byte_data(chip->client, AD7152_REG_CFG2, data);
if (ret < 0)
return ret;
for (i = 0; i < ARRAY_SIZE(ad7152_filter_rate_table); i++)
if (data >= ad7152_filter_rate_table[i][0])
break;
chip->filter_rate_setup = data;
if (i >= ARRAY_SIZE(ad7152_filter_rate_table))
i = ARRAY_SIZE(ad7152_filter_rate_table) - 1;
mutex_lock(&indio_dev->mlock);
ret = i2c_smbus_write_byte_data(chip->client,
AD7152_REG_CFG2, AD7152_CFG2_OSR(i));
if (ret < 0) {
mutex_unlock(&indio_dev->mlock);
return ret;
}
chip->filter_rate_setup = i;
mutex_unlock(&indio_dev->mlock);
return len;
}
static IIO_DEV_ATTR_FILTER_RATE_SETUP(S_IRUGO | S_IWUSR,
static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
ad7152_show_filter_rate_setup,
ad7152_store_filter_rate_setup);
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("200 50 20 17");
static IIO_CONST_ATTR(in_capacitance_scale_available,
"0.000061050 0.000030525 0.000015263 0.000007631");
static struct attribute *ad7152_attributes[] = {
&iio_dev_attr_filter_rate_setup.dev_attr.attr,
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
&iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
&iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
&iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
&iio_const_attr_in_capacitance_scale_available.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
@ -340,7 +359,7 @@ static int ad7152_read_raw(struct iio_dev *indio_dev,
if (ret < 0)
goto out;
msleep(60); /* Slowest conversion time */
msleep(ad7152_filter_rate_table[chip->filter_rate_setup][1]);
/* Now read the actual register */
ret = i2c_smbus_read_word_data(chip->client,
ad7152_addresses[chan->channel][AD7152_DATA]);