staging: iio: adc: ad799x miscellaneous cleanups

-Simplify by using iio_alloc_pollfunc helper function
-Print in_scale in decimal format.
-Simplify ring pointer dereferences

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

diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
index 35fad73..6309d52 100644 (file)
--- a/drivers/staging/iio/adc/ad799x_core.c
+++ b/drivers/staging/iio/adc/ad799x_core.c
@@ -428,14 +428,11 @@ static ssize_t ad799x_show_scale(struct device *dev,
        /* Driver currently only support internal vref */
        struct iio_dev *dev_info = dev_get_drvdata(dev);
        struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+
        /* Corresponds to Vref / 2^(bits) */
+       unsigned int scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->bits;
 
-       if ((1 << (st->chip_info->bits + 1))
-           > st->int_vref_mv)
-               return sprintf(buf, "0.5\n");
-       else
-               return sprintf(buf, "%d\n",
-                       st->int_vref_mv >> st->chip_info->bits);
+       return sprintf(buf, "%d.%d\n", scale_uv / 1000, scale_uv % 1000);
 }
 
 static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);

diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c
index c6871fa..975cdcb 100644 (file)
--- a/drivers/staging/iio/adc/ad799x_ring.c
+++ b/drivers/staging/iio/adc/ad799x_ring.c
@@ -32,6 +32,7 @@ int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
        struct iio_ring_buffer *ring = st->indio_dev->ring;
        int count = 0, ret;
        u16 *ring_data;
+
        if (!(ring->scan_mask & mask)) {
                ret = -EBUSY;
                goto error_ret;
@@ -70,6 +71,7 @@ error_ret:
  **/
 static int ad799x_ring_preenable(struct iio_dev *indio_dev)
 {
+       struct iio_ring_buffer *ring = indio_dev->ring;
        struct ad799x_state *st = indio_dev->dev_data;
        size_t d_size;
        unsigned long numvals;
@@ -80,16 +82,15 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev)
         */
 
        if (st->id == ad7997 || st->id == ad7998)
-               ad799x_set_scan_mode(st, st->indio_dev->ring->scan_mask);
+               ad799x_set_scan_mode(st, ring->scan_mask);
 
-       numvals = st->indio_dev->ring->scan_count;
+       numvals = ring->scan_count;
 
-       if (indio_dev->ring->access.set_bytes_per_datum) {
+       if (ring->access.set_bytes_per_datum) {
                d_size = numvals*2 + sizeof(s64);
                if (d_size % 8)
                        d_size += 8 - (d_size % 8);
-               indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring,
-                                                           d_size);
+               ring->access.set_bytes_per_datum(ring, d_size);
        }
 
        return 0;
@@ -124,14 +125,15 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s)
        struct ad799x_state *st = container_of(work_s, struct ad799x_state,
                                                  poll_work);
        struct iio_dev *indio_dev = st->indio_dev;
-       struct iio_sw_ring_buffer *ring = iio_to_sw_ring(indio_dev->ring);
+       struct iio_ring_buffer *ring = indio_dev->ring;
+       struct iio_sw_ring_buffer *ring_sw = iio_to_sw_ring(indio_dev->ring);
        s64 time_ns;
        __u8 *rxbuf;
        int b_sent;
        size_t d_size;
        u8 cmd;
 
-       unsigned long numvals = st->indio_dev->ring->scan_count;
+       unsigned long numvals = ring->scan_count;
 
        /* Ensure the timestamp is 8 byte aligned */
        d_size = numvals*2 + sizeof(s64);
@@ -158,14 +160,13 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s)
        case ad7991:
        case ad7995:
        case ad7999:
-               cmd = st->config | (st->indio_dev->ring->scan_mask <<
-                       AD799X_CHANNEL_SHIFT);
+               cmd = st->config | (ring->scan_mask << AD799X_CHANNEL_SHIFT);
                break;
        case ad7992:
        case ad7993:
        case ad7994:
-               cmd = (st->indio_dev->ring->scan_mask <<
-                       AD799X_CHANNEL_SHIFT) | AD7998_CONV_RES_REG;
+               cmd = (ring->scan_mask << AD799X_CHANNEL_SHIFT) |
+                       AD7998_CONV_RES_REG;
                break;
        case ad7997:
        case ad7998:
@@ -184,7 +185,7 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s)
 
        memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
 
-       indio_dev->ring->access.store_to(&ring->buf, rxbuf, time_ns);
+       ring->access.store_to(&ring_sw->buf, rxbuf, time_ns);
 done:
        kfree(rxbuf);
        atomic_dec(&st->protect_ring);
@@ -203,14 +204,9 @@ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
        }
        /* Effectively select the ring buffer implementation */
        iio_ring_sw_register_funcs(&st->indio_dev->ring->access);
-       indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
-       if (indio_dev->pollfunc == NULL) {
-               ret = -ENOMEM;
+       ret = iio_alloc_pollfunc(indio_dev, NULL, &ad799x_poll_func_th);
+       if (ret)
                goto error_deallocate_sw_rb;
-       }
-       /* Configure the polling function called on trigger interrupts */
-       indio_dev->pollfunc->poll_func_main = &ad799x_poll_func_th;
-       indio_dev->pollfunc->private_data = indio_dev;
 
        /* Ring buffer functions - here trigger setup related */