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>

diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index f4d280456dd7a34a46b868c71ee9b6fa93074d4c..a543cffb4ec3efd5cf018cbbdad6ccb2600e6690 100644 (file)
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -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 @@ err:
        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,
 };