staging:iio:resolver:ad2s1210 minimal chan spec conversion.

Just convert the raw reads in this patch.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
index 9a88563..697db80 100644 (file)
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ b/drivers/staging/iio/resolver/ad2s1210.c
@@ -514,71 +514,70 @@ error_ret:
        return ret < 0 ? ret : len;
 }
 
-static ssize_t ad2s1210_show_pos(struct device *dev,
-                                struct device_attribute *attr,
-                                char *buf)
+static int ad2s1210_read_raw(struct iio_dev *indio_dev,
+                            struct iio_chan_spec const *chan,
+                            int *val,
+                            int *val2,
+                            long m)
 {
+       struct ad2s1210_state *st = iio_priv(indio_dev);
+       bool negative;
        int ret = 0;
-       ssize_t len = 0;
        u16 pos;
-       struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev));
-
-       mutex_lock(&st->lock);
-       gpio_set_value(st->pdata->sample, 0);
-       /* delay (6 * tck + 20) nano seconds */
-       udelay(1);
-
-       ad2s1210_set_mode(MOD_POS, st);
-       ret = spi_read(st->sdev, st->rx, 2);
-       if (ret)
-               goto error_ret;
-       pos = be16_to_cpup((u16 *)st->rx);
-       if (st->hysteresis)
-               pos >>= 16 - st->resolution;
-       len = sprintf(buf, "%d\n", pos);
-error_ret:
-       gpio_set_value(st->pdata->sample, 1);
-       /* delay (2 * tck + 20) nano seconds */
-       udelay(1);
-       mutex_unlock(&st->lock);
-
-       return ret < 0 ? ret : len;
-}
-
-static ssize_t ad2s1210_show_vel(struct device *dev,
-                                struct device_attribute *attr,
-                                char *buf)
-{
-       unsigned short negative;
-       int ret = 0;
-       ssize_t len = 0;
        s16 vel;
-       struct ad2s1210_state *st = iio_priv(dev_get_drvdata(dev));
 
        mutex_lock(&st->lock);
        gpio_set_value(st->pdata->sample, 0);
        /* delay (6 * tck + 20) nano seconds */
        udelay(1);
 
-       ad2s1210_set_mode(MOD_VEL, st);
+       switch (chan->type) {
+       case IIO_ANGL:
+               ad2s1210_set_mode(MOD_POS, st);
+               break;
+       case IIO_ANGL_VEL:
+               ad2s1210_set_mode(MOD_VEL, st);
+               break;
+       default:
+              ret = -EINVAL;
+              break;
+       }
+       if (ret < 0)
+               goto error_ret;
        ret = spi_read(st->sdev, st->rx, 2);
-       if (ret)
+       if (ret < 0)
                goto error_ret;
-       negative = st->rx[0] & 0x80;
-       vel = be16_to_cpup((s16 *)st->rx);
-       vel >>= 16 - st->resolution;
-       if (vel & 0x8000) {
-               negative = (0xffff >> st->resolution) << st->resolution;
-               vel |= negative;
+
+       switch (chan->type) {
+       case IIO_ANGL:
+               pos = be16_to_cpup((u16 *)st->rx);
+               if (st->hysteresis)
+                       pos >>= 16 - st->resolution;
+               *val = pos;
+               ret = IIO_VAL_INT;
+               break;
+       case IIO_ANGL_VEL:
+               negative = st->rx[0] & 0x80;
+               vel = be16_to_cpup((s16 *)st->rx);
+               vel >>= 16 - st->resolution;
+               if (vel & 0x8000) {
+                       negative = (0xffff >> st->resolution) << st->resolution;
+                       vel |= negative;
+               }
+               *val = vel;
+               ret = IIO_VAL_INT;
+               break;
+       default:
+               mutex_unlock(&st->lock);
+               return -EINVAL;
        }
-       len = sprintf(buf, "%d\n", vel);
+
 error_ret:
        gpio_set_value(st->pdata->sample, 1);
        /* delay (2 * tck + 20) nano seconds */
        udelay(1);
        mutex_unlock(&st->lock);
-
-       return ret < 0 ? ret : len;
+       return ret;
 }
 
 static IIO_DEVICE_ATTR(raw_io, S_IRUGO | S_IWUSR,
@@ -595,8 +594,7 @@ static IIO_DEVICE_ATTR(bits, S_IRUGO | S_IWUSR,
                       ad2s1210_show_resolution, ad2s1210_store_resolution, 0);
 static IIO_DEVICE_ATTR(fault, S_IRUGO | S_IWUSR,
                       ad2s1210_show_fault, ad2s1210_clear_fault, 0);
-static IIO_DEVICE_ATTR(pos, S_IRUGO, ad2s1210_show_pos, NULL, 0);
-static IIO_DEVICE_ATTR(vel, S_IRUGO,  ad2s1210_show_vel, NULL, 0);
+
 static IIO_DEVICE_ATTR(los_thrd, S_IRUGO | S_IWUSR,
                       ad2s1210_show_reg, ad2s1210_store_reg,
                       AD2S1210_REG_LOS_THRD);
@@ -619,6 +617,19 @@ static IIO_DEVICE_ATTR(lot_low_thrd, S_IRUGO | S_IWUSR,
                       ad2s1210_show_reg, ad2s1210_store_reg,
                       AD2S1210_REG_LOT_LOW_THRD);
 
+
+static struct iio_chan_spec ad2s1210_channels[] = {
+       {
+               .type = IIO_ANGL,
+               .indexed = 1,
+               .channel = 0,
+       }, {
+               .type = IIO_ANGL_VEL,
+               .indexed = 1,
+               .channel = 0,
+       }
+};
+
 static struct attribute *ad2s1210_attributes[] = {
        &iio_dev_attr_raw_io.dev_attr.attr,
        &iio_dev_attr_reset.dev_attr.attr,
@@ -627,8 +638,6 @@ static struct attribute *ad2s1210_attributes[] = {
        &iio_dev_attr_control.dev_attr.attr,
        &iio_dev_attr_bits.dev_attr.attr,
        &iio_dev_attr_fault.dev_attr.attr,
-       &iio_dev_attr_pos.dev_attr.attr,
-       &iio_dev_attr_vel.dev_attr.attr,
        &iio_dev_attr_los_thrd.dev_attr.attr,
        &iio_dev_attr_dos_ovr_thrd.dev_attr.attr,
        &iio_dev_attr_dos_mis_thrd.dev_attr.attr,
@@ -681,6 +690,7 @@ error_ret:
 }
 
 static const struct iio_info ad2s1210_info = {
+       .read_raw = &ad2s1210_read_raw,
        .attrs = &ad2s1210_attribute_group,
        .driver_module = THIS_MODULE,
 };
@@ -760,6 +770,8 @@ static int __devinit ad2s1210_probe(struct spi_device *spi)
        indio_dev->dev.parent = &spi->dev;
        indio_dev->info = &ad2s1210_info;
        indio_dev->modes = INDIO_DIRECT_MODE;
+       indio_dev->channels = ad2s1210_channels;
+       indio_dev->num_channels = ARRAY_SIZE(ad2s1210_channels);
        indio_dev->name = spi_get_device_id(spi)->name;
 
        ret = iio_device_register(indio_dev);