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iio:bma180: Implement _available sysfs attribute dynamically 

makes it easier to add more chip variants and removes redundancy:
scales and frequencies are now stated just once

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Cc: Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald 2014-08-19 23:43:00 +01:00 committed by Jonathan Cameron
parent 6377aa496a
commit 402a324e61
1 changed files with 43 additions and 11 deletions
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54
drivers/iio/accel/bma180.c
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@ -85,12 +85,6 @@ struct bma180_part_info {
#define BMA180_DEF_BW 20
#define BMA180_DEF_SCALE 2452
/* Available values for sysfs */
#define BMA180_FLP_FREQ_AVAILABLE \
"10 20 40 75 150 300"
#define BMA180_SCALE_AVAILABLE \
"0.001275 0.001863 0.002452 0.003727 0.004903 0.009709 0.019417"
struct bma180_data {
struct i2c_client *client;
struct iio_trigger *trig;
@ -349,13 +343,51 @@ static void bma180_chip_disable(struct bma180_data *data)
dev_err(&data->client->dev, "failed to disable the chip\n");
}
static IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available,
BMA180_FLP_FREQ_AVAILABLE);
static IIO_CONST_ATTR(in_accel_scale_available, BMA180_SCALE_AVAILABLE);
static ssize_t bma180_show_avail(char *buf, const int *vals, unsigned n,
bool micros)
{
size_t len = 0;
int i;
for (i = 0; i < n; i++) {
if (!vals[i])
continue;
len += scnprintf(buf + len, PAGE_SIZE - len,
micros ? "0.%06d " : "%d ", vals[i]);
}
buf[len - 1] = '\n';
return len;
}
static ssize_t bma180_show_filter_freq_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
return bma180_show_avail(buf, data->part_info->bw_table,
data->part_info->num_bw, false);
}
static ssize_t bma180_show_scale_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bma180_data *data = iio_priv(dev_to_iio_dev(dev));
return bma180_show_avail(buf, data->part_info->scale_table,
data->part_info->num_scales, true);
}
static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
S_IRUGO, bma180_show_filter_freq_avail, NULL, 0);
static IIO_DEVICE_ATTR(in_accel_scale_available,
S_IRUGO, bma180_show_scale_avail, NULL, 0);
static struct attribute *bma180_attributes[] = {
&iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
&iio_const_attr_in_accel_scale_available.dev_attr.attr,
&iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.
dev_attr.attr,
&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
NULL,
};