From 729bbf5404d322e73b5bece968b1ca59d13474de Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Mon, 5 Dec 2011 22:18:24 +0000 Subject: [PATCH] staging:iio:adc:ad799x stop reading from buffer for sysfs accesses No known use case and makes in kernel interface work more complex. Signed-off-by: Jonathan Cameron Acked-by: Lars-Peter Clausen Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/adc/ad799x.h | 6 ------ drivers/staging/iio/adc/ad799x_core.c | 3 +-- drivers/staging/iio/adc/ad799x_ring.c | 30 ------------------------------ 3 files changed, 1 insertion(+), 38 deletions(-) diff --git a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h index eda01d5..356f690 100644 --- a/drivers/staging/iio/adc/ad799x.h +++ b/drivers/staging/iio/adc/ad799x.h @@ -124,15 +124,9 @@ struct ad799x_platform_data { int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask); #ifdef CONFIG_AD799X_RING_BUFFER -int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum); int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev); void ad799x_ring_cleanup(struct iio_dev *indio_dev); #else /* CONFIG_AD799X_RING_BUFFER */ -int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum) -{ - return -EINVAL; -} - static inline int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev) diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c index 5bedb19..815e6b9 100644 --- a/drivers/staging/iio/adc/ad799x_core.c +++ b/drivers/staging/iio/adc/ad799x_core.c @@ -151,8 +151,7 @@ static int ad799x_read_raw(struct iio_dev *indio_dev, case 0: mutex_lock(&indio_dev->mlock); if (iio_buffer_enabled(indio_dev)) - ret = ad799x_single_channel_from_ring(indio_dev, - chan->scan_index); + ret = -EBUSY; else ret = ad799x_scan_direct(st, chan->scan_index); mutex_unlock(&indio_dev->mlock); diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c index 5841c3c..5dded9e 100644 --- a/drivers/staging/iio/adc/ad799x_ring.c +++ b/drivers/staging/iio/adc/ad799x_ring.c @@ -23,36 +23,6 @@ #include "ad799x.h" -int ad799x_single_channel_from_ring(struct iio_dev *indio_dev, int channum) -{ - struct iio_buffer *ring = indio_dev->buffer; - int count = 0, ret; - u16 *ring_data; - - if (!(test_bit(channum, ring->scan_mask))) { - ret = -EBUSY; - goto error_ret; - } - - ring_data = kmalloc(ring->access->get_bytes_per_datum(ring), - GFP_KERNEL); - if (ring_data == NULL) { - ret = -ENOMEM; - goto error_ret; - } - ret = ring->access->read_last(ring, (u8 *) ring_data); - if (ret) - goto error_free_ring_data; - /* Need a count of channels prior to this one */ - count = bitmap_weight(ring->scan_mask, channum); - ret = be16_to_cpu(ring_data[count]); - -error_free_ring_data: - kfree(ring_data); -error_ret: - return ret; -} - /** * ad799x_ring_preenable() setup the parameters of the ring before enabling * -- 2.7.4