Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
---
drivers/staging/iio/magnetometer/hmc5843.c | 135 +++++++++++-----------------
1 file changed, 54 insertions(+), 81 deletions(-)
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
index 5327e5f..d8a5c01 100644
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -165,18 +165,19 @@ static const int hmc5883l_regval_to_input_field_mga[] = {
* 6 | 50 | 75
* 7 | Not used | Not used
*/
-static const char * const hmc5843_regval_to_sample_freq[] = {
- "0.5", "1", "2", "5", "10", "20", "50",
+static const int hmc5843_regval_to_samp_freq[7][2] = {
+ {0, 500000}, {1, 0}, {2, 0}, {5, 0}, {10, 0}, {20, 0}, {50, 0}
};
-static const char * const hmc5883_regval_to_sample_freq[] = {
- "0.75", "1.5", "3", "7.5", "15", "30", "75",
+static const int hmc5883_regval_to_samp_freq[7][2] = {
+ {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0},
+ {75, 0}
};
/* Describe chip variants */
struct hmc5843_chip_info {
const struct iio_chan_spec *channels;
- const char * const *regval_to_sample_freq;
+ const int (*regval_to_samp_freq)[2];
const int *regval_to_input_field_mga;
const int *regval_to_nanoscale;
};
@@ -370,17 +371,17 @@ static IIO_DEVICE_ATTR(meas_conf,
hmc5843_set_measurement_configuration,
0);
-static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static ssize_t hmc5843_show_samp_freq_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct hmc5843_data *data = iio_priv(indio_dev);
+ struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
ssize_t total_n = 0;
int i;
for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
- ssize_t n = sprintf(buf, "%s ", data->variant->regval_to_sample_freq[i]);
+ ssize_t n = sprintf(buf, "%d.%d ",
+ data->variant->regval_to_samp_freq[i][0],
+ data->variant->regval_to_samp_freq[i][1]);
buf += n;
total_n += n;
}
@@ -390,87 +391,30 @@ static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev,
return total_n;
}
-static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_sampling_frequencies_available);
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_samp_freq_avail);
static s32 hmc5843_set_rate(struct hmc5843_data *data, u8 rate)
{
- u8 reg_val;
+ u8 reg_val = data->meas_conf | (rate << HMC5843_RATE_OFFSET);
- if (rate >= HMC5843_RATE_NOT_USED) {
- dev_err(&data->client->dev,
- "data output rate is not supported\n");
- return -EINVAL;
- }
-
- reg_val = data->meas_conf | (rate << HMC5843_RATE_OFFSET);
return i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
reg_val);
}
-static int hmc5843_check_sampling_frequency(struct hmc5843_data *data,
- const char *buf)
+static int hmc5843_check_samp_freq(struct hmc5843_data *data,
+ int val, int val2)
{
- const char * const *samp_freq = data->variant->regval_to_sample_freq;
int i;
for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
- if (sysfs_streq(buf, samp_freq[i]))
+ if (val == data->variant->regval_to_samp_freq[i][0] &&
+ val2 == data->variant->regval_to_samp_freq[i][1])
return i;
}
return -EINVAL;
}
-static ssize_t hmc5843_set_sampling_frequency(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
-
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct hmc5843_data *data = iio_priv(indio_dev);
- int rate;
-
- rate = hmc5843_check_sampling_frequency(data, buf);
- if (rate < 0) {
- dev_err(&data->client->dev,
- "sampling frequency is not supported\n");
- return rate;
- }
-
- mutex_lock(&data->lock);
- dev_dbg(dev, "set rate to %d\n", rate);
- if (hmc5843_set_rate(data->client, rate)) {
- count = -EINVAL;
- goto exit;
- }
- data->rate = rate;
-
-exit:
- mutex_unlock(&data->lock);
- return count;
-}
-
-static ssize_t hmc5843_show_sampling_frequency(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- struct hmc5843_data *data = iio_priv(indio_dev);
- s32 rate;
-
- rate = i2c_smbus_read_byte_data(data->client, this_attr->address);
- if (rate < 0)
- return rate;
- rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET;
- return sprintf(buf, "%s\n", data->variant->regval_to_sample_freq[rate]);
-}
-
-static IIO_DEVICE_ATTR(sampling_frequency,
- S_IWUSR | S_IRUGO,
- hmc5843_show_sampling_frequency,
- hmc5843_set_sampling_frequency,
- HMC5843_CONFIG_REG_A);
-
static ssize_t hmc5843_show_range_gain(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -525,8 +469,7 @@ static IIO_DEVICE_ATTR(in_magn_range,
static int hmc5843_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
- int *val, int *val2,
- long mask)
+ int *val, int *val2, long mask)
{
struct hmc5843_data *data = iio_priv(indio_dev);
@@ -537,17 +480,47 @@ static int hmc5843_read_raw(struct iio_dev *indio_dev,
*val = 0;
*val2 = data->variant->regval_to_nanoscale[data->range];
return IIO_VAL_INT_PLUS_NANO;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = data->variant->regval_to_samp_freq[data->rate][0];
+ *val2 = data->variant->regval_to_samp_freq[data->rate][1];
+ return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
+static int hmc5843_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct hmc5843_data *data = iio_priv(indio_dev);
+ int ret, rate;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ rate = hmc5843_check_samp_freq(data, val, val2);
+ if (rate < 0)
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+ ret = hmc5843_set_rate(data, rate);
+ if (ret >= 0)
+ data->rate = rate;
+ mutex_unlock(&data->lock);
+
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
#define HMC5843_CHANNEL(axis, addr) \
{ \
.type = IIO_MAGN, \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.address = addr \
}
@@ -566,7 +539,6 @@ static const struct iio_chan_spec hmc5883_channels[] = {
static struct attribute *hmc5843_attributes[] = {
&iio_dev_attr_meas_conf.dev_attr.attr,
&iio_dev_attr_operating_mode.dev_attr.attr,
- &iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_dev_attr_in_magn_range.dev_attr.attr,
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL
@@ -579,21 +551,21 @@ static const struct attribute_group hmc5843_group = {
static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
[HMC5843_ID] = {
.channels = hmc5843_channels,
- .regval_to_sample_freq = hmc5843_regval_to_sample_freq,
+ .regval_to_samp_freq = hmc5843_regval_to_samp_freq,
.regval_to_input_field_mga =
hmc5843_regval_to_input_field_mga,
.regval_to_nanoscale = hmc5843_regval_to_nanoscale,
},
[HMC5883_ID] = {
.channels = hmc5883_channels,
- .regval_to_sample_freq = hmc5883_regval_to_sample_freq,
+ .regval_to_samp_freq = hmc5883_regval_to_samp_freq,
.regval_to_input_field_mga =
hmc5883_regval_to_input_field_mga,
.regval_to_nanoscale = hmc5883_regval_to_nanoscale,
},
[HMC5883L_ID] = {
.channels = hmc5883_channels,
- .regval_to_sample_freq = hmc5883_regval_to_sample_freq,
+ .regval_to_samp_freq = hmc5883_regval_to_samp_freq,
.regval_to_input_field_mga =
hmc5883l_regval_to_input_field_mga,
.regval_to_nanoscale = hmc5883l_regval_to_nanoscale,
@@ -612,6 +584,7 @@ static void hmc5843_init(struct hmc5843_data *data)
static const struct iio_info hmc5843_info = {
.attrs = &hmc5843_group,
.read_raw = &hmc5843_read_raw,
+ .write_raw = &hmc5843_write_raw,
.driver_module = THIS_MODULE,
};
--
1.7.9.5
--
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