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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>
This commit is contained in:
Michael Hennerich 2010-10-12 10:30:51 +02:00 committed by Greg Kroah-Hartman
parent 668413e9e7
commit 1139df5353
2 changed files with 19 additions and 26 deletions
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11
drivers/staging/iio/adc/ad799x_core.c
View File

@ -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) */
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);
/* Corresponds to Vref / 2^(bits) */
unsigned int scale_uv = (st->int_vref_mv * 1000) >> 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);

34
drivers/staging/iio/adc/ad799x_ring.c
View File

@ -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 */