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authorJonathan Cameron <jic23@kernel.org>2014-06-22 20:59:00 +0100
committerJonathan Cameron <jic23@kernel.org>2014-07-07 09:44:17 +0100
commit82695ef549b5299d3d9e088d6648289bda8ef3d8 (patch)
treea9f29217a52350fb3000db4f112723e1249a2bec /drivers/iio
parent95bb8918f9bc87a69cb7a795b568e01afecff9cb (diff)
downloadop-kernel-dev-82695ef549b5299d3d9e088d6648289bda8ef3d8.zip
op-kernel-dev-82695ef549b5299d3d9e088d6648289bda8ef3d8.tar.gz
iio: adis: Switch sampling frequency attr to core support.
By using the info_mask_shared_by_all element of the channel spec, acce to the sampling frequency becomes available to in kernel users of the driver. It also shortens and simplifies the code. This particular conversion was made more complicated by the shared library and the fact that a number of the drivers do not actually have support for setting or reading the sampling frequency. The hardware, in those cases investigated supports it. It's just never been implemented. Signed-off-by: Jonathan Cameron <jic23@kernel.org> Reviewed-by: Hartmut Knaack <knaack.h@gmx.de> Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/gyro/adis16260.c124
1 files changed, 46 insertions, 78 deletions
diff --git a/drivers/iio/gyro/adis16260.c b/drivers/iio/gyro/adis16260.c
index 22b6fb8..75fe0ed 100644
--- a/drivers/iio/gyro/adis16260.c
+++ b/drivers/iio/gyro/adis16260.c
@@ -101,65 +101,6 @@
#define ADIS16260_SCAN_TEMP 3
#define ADIS16260_SCAN_ANGL 4
-static ssize_t adis16260_read_frequency(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct adis *adis = iio_priv(indio_dev);
- int ret, len = 0;
- u16 t;
- int sps;
- ret = adis_read_reg_16(adis, ADIS16260_SMPL_PRD, &t);
- if (ret)
- return ret;
-
- if (spi_get_device_id(adis->spi)->driver_data) /* If an adis16251 */
- sps = (t & ADIS16260_SMPL_PRD_TIME_BASE) ? 8 : 256;
- else
- sps = (t & ADIS16260_SMPL_PRD_TIME_BASE) ? 66 : 2048;
- sps /= (t & ADIS16260_SMPL_PRD_DIV_MASK) + 1;
- len = sprintf(buf, "%d\n", sps);
- return len;
-}
-
-static ssize_t adis16260_write_frequency(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct adis *adis = iio_priv(indio_dev);
- unsigned int val;
- int ret;
- u8 t;
-
- ret = kstrtouint(buf, 10, &val);
- if (ret)
- return ret;
-
- mutex_lock(&indio_dev->mlock);
- if (spi_get_device_id(adis->spi)->driver_data)
- t = 256 / val;
- else
- t = 2048 / val;
-
- if (t > ADIS16260_SMPL_PRD_DIV_MASK)
- t = ADIS16260_SMPL_PRD_DIV_MASK;
- else if (t > 0)
- t--;
-
- if (t >= 0x0A)
- adis->spi->max_speed_hz = ADIS16260_SPI_SLOW;
- else
- adis->spi->max_speed_hz = ADIS16260_SPI_FAST;
- ret = adis_write_reg_8(adis, ADIS16260_SMPL_PRD, t);
-
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-
/* Power down the device */
static int adis16260_stop_device(struct iio_dev *indio_dev)
{
@@ -174,18 +115,19 @@ static int adis16260_stop_device(struct iio_dev *indio_dev)
return ret;
}
-static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
- adis16260_read_frequency,
- adis16260_write_frequency);
-
static const struct iio_chan_spec adis16260_channels[] = {
ADIS_GYRO_CHAN(X, ADIS16260_GYRO_OUT, ADIS16260_SCAN_GYRO,
BIT(IIO_CHAN_INFO_CALIBBIAS) |
- BIT(IIO_CHAN_INFO_CALIBSCALE), 14),
- ADIS_INCLI_CHAN(X, ADIS16260_ANGL_OUT, ADIS16260_SCAN_ANGL, 0, 14),
- ADIS_TEMP_CHAN(ADIS16260_TEMP_OUT, ADIS16260_SCAN_TEMP, 12),
- ADIS_SUPPLY_CHAN(ADIS16260_SUPPLY_OUT, ADIS16260_SCAN_SUPPLY, 12),
- ADIS_AUX_ADC_CHAN(ADIS16260_AUX_ADC, ADIS16260_SCAN_AUX_ADC, 12),
+ BIT(IIO_CHAN_INFO_CALIBSCALE),
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), 14),
+ ADIS_INCLI_CHAN(X, ADIS16260_ANGL_OUT, ADIS16260_SCAN_ANGL, 0,
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), 14),
+ ADIS_TEMP_CHAN(ADIS16260_TEMP_OUT, ADIS16260_SCAN_TEMP,
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), 12),
+ ADIS_SUPPLY_CHAN(ADIS16260_SUPPLY_OUT, ADIS16260_SCAN_SUPPLY,
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), 12),
+ ADIS_AUX_ADC_CHAN(ADIS16260_AUX_ADC, ADIS16260_SCAN_AUX_ADC,
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), 12),
IIO_CHAN_SOFT_TIMESTAMP(5),
};
@@ -258,6 +200,20 @@ static int adis16260_read_raw(struct iio_dev *indio_dev,
*val = val16;
return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = adis_read_reg_16(adis, ADIS16260_SMPL_PRD, &val16);
+ if (ret)
+ return ret;
+
+ if (spi_get_device_id(adis->spi)->driver_data)
+ /* If an adis16251 */
+ *val = (val16 & ADIS16260_SMPL_PRD_TIME_BASE) ?
+ 8 : 256;
+ else
+ *val = (val16 & ADIS16260_SMPL_PRD_TIME_BASE) ?
+ 66 : 2048;
+ *val /= (val16 & ADIS16260_SMPL_PRD_DIV_MASK) + 1;
+ return IIO_VAL_INT;
}
return -EINVAL;
}
@@ -269,7 +225,9 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct adis *adis = iio_priv(indio_dev);
+ int ret;
u8 addr;
+ u8 t;
switch (mask) {
case IIO_CHAN_INFO_CALIBBIAS:
@@ -284,21 +242,31 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
addr = adis16260_addresses[chan->scan_index][1];
return adis_write_reg_16(adis, addr, val);
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ mutex_lock(&indio_dev->mlock);
+ if (spi_get_device_id(adis->spi)->driver_data)
+ t = 256 / val;
+ else
+ t = 2048 / val;
+
+ if (t > ADIS16260_SMPL_PRD_DIV_MASK)
+ t = ADIS16260_SMPL_PRD_DIV_MASK;
+ else if (t > 0)
+ t--;
+
+ if (t >= 0x0A)
+ adis->spi->max_speed_hz = ADIS16260_SPI_SLOW;
+ else
+ adis->spi->max_speed_hz = ADIS16260_SPI_FAST;
+ ret = adis_write_reg_8(adis, ADIS16260_SMPL_PRD, t);
+
+ mutex_unlock(&indio_dev->mlock);
+ return ret;
}
return -EINVAL;
}
-static struct attribute *adis16260_attributes[] = {
- &iio_dev_attr_sampling_frequency.dev_attr.attr,
- NULL
-};
-
-static const struct attribute_group adis16260_attribute_group = {
- .attrs = adis16260_attributes,
-};
-
static const struct iio_info adis16260_info = {
- .attrs = &adis16260_attribute_group,
.read_raw = &adis16260_read_raw,
.write_raw = &adis16260_write_raw,
.update_scan_mode = adis_update_scan_mode,
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