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iio: gyro: itg3200 switch sampling frequency attr to core support. 

By using the info_mask_shared_by_all element of the channel spec, access
to the sampling frequency becomes available to in kernel users of the
driver.  It also shortens and simplifies the code a little.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Cc: Manuel Stahl <manuel.stahl@iis.fraunhofer.de>
Cc: Thorsten Nowak <thorsten.nowak@iis.fraunhofer.de>
Cc: Christian Strobel <christian.strobel@iis.fraunhofer.de>
This commit is contained in:
Jonathan Cameron 2014-06-22 20:59:00 +01:00
parent 2d239c9e92
commit 95bb8918f9
1 changed files with 45 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
drivers/iio/gyro/itg3200_core.c
View File

@ -90,6 +90,7 @@ static int itg3200_read_raw(struct iio_dev *indio_dev,
{
int ret = 0;
u8 reg;
u8 regval;
switch (info) {
case IIO_CHAN_INFO_RAW:
@ -107,65 +108,60 @@ static int itg3200_read_raw(struct iio_dev *indio_dev,
/* Only the temperature channel has an offset */
*val = 23000;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SAMP_FREQ:
ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &regval);
if (ret)
return ret;
*val = (regval & ITG3200_DLPF_CFG_MASK) ? 1000 : 8000;
ret = itg3200_read_reg_8(indio_dev,
ITG3200_REG_SAMPLE_RATE_DIV,
&regval);
if (ret)
return ret;
*val /= regval + 1;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static ssize_t itg3200_read_frequency(struct device *dev,
struct device_attribute *attr, char *buf)
static int itg3200_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
int ret, sps;
u8 val;
ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &val);
if (ret)
return ret;
sps = (val & ITG3200_DLPF_CFG_MASK) ? 1000 : 8000;
ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_SAMPLE_RATE_DIV, &val);
if (ret)
return ret;
sps /= val + 1;
return sprintf(buf, "%d\n", sps);
}
static ssize_t itg3200_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);
unsigned val;
int ret;
u8 t;
ret = kstrtouint(buf, 10, &val);
if (ret)
return ret;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
if (val == 0 || val2 != 0)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
mutex_lock(&indio_dev->mlock);
ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &t);
if (ret)
goto err_ret;
ret = itg3200_read_reg_8(indio_dev, ITG3200_REG_DLPF, &t);
if (ret) {
mutex_unlock(&indio_dev->mlock);
return ret;
}
t = ((t & ITG3200_DLPF_CFG_MASK) ? 1000u : 8000u) / val - 1;
if (val == 0) {
ret = -EINVAL;
goto err_ret;
ret = itg3200_write_reg_8(indio_dev,
ITG3200_REG_SAMPLE_RATE_DIV,
t);
mutex_unlock(&indio_dev->mlock);
return ret;
default:
return -EINVAL;
}
t = ((t & ITG3200_DLPF_CFG_MASK) ? 1000u : 8000u) / val - 1;
ret = itg3200_write_reg_8(indio_dev, ITG3200_REG_SAMPLE_RATE_DIV, t);
err_ret:
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
/*
@ -255,6 +251,7 @@ err_ret:
.channel2 = IIO_MOD_ ## _mod, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.address = ITG3200_REG_GYRO_ ## _mod ## OUT_H, \
.scan_index = ITG3200_SCAN_GYRO_ ## _mod, \
.scan_type = ITG3200_ST, \
@ -267,6 +264,7 @@ static const struct iio_chan_spec itg3200_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
.address = ITG3200_REG_TEMP_OUT_H,
.scan_index = ITG3200_SCAN_TEMP,
.scan_type = ITG3200_ST,
@ -277,22 +275,9 @@ static const struct iio_chan_spec itg3200_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(ITG3200_SCAN_ELEMENTS),
};
/* IIO device attributes */
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, itg3200_read_frequency,
itg3200_write_frequency);
static struct attribute *itg3200_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
NULL
};
static const struct attribute_group itg3200_attribute_group = {
.attrs = itg3200_attributes,
};
static const struct iio_info itg3200_info = {
.attrs = &itg3200_attribute_group,
.read_raw = &itg3200_read_raw,
.write_raw = &itg3200_write_raw,
.driver_module = THIS_MODULE,
};