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author | Paul Mundt <lethal@linux-sh.org> | 2011-03-17 07:44:08 (GMT) |
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committer | Paul Mundt <lethal@linux-sh.org> | 2011-03-17 07:44:08 (GMT) |
commit | 1d2a1959fe534279cf37aba20b08c24c20840e52 (patch) | |
tree | 67c0b9aa7fe22a44bf0b4af88947799203eb8f67 /drivers/staging/iio/adc/ad799x_ring.c | |
parent | 5a79ce76e9bb8f4b2cd8106ee36d15ee05013bcf (diff) | |
parent | 054cfaacf88865bff1dd58d305443d5d6c068a08 (diff) | |
download | linux-1d2a1959fe534279cf37aba20b08c24c20840e52.tar.xz |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into sh-latest
Diffstat (limited to 'drivers/staging/iio/adc/ad799x_ring.c')
-rw-r--r-- | drivers/staging/iio/adc/ad799x_ring.c | 43 |
1 files changed, 16 insertions, 27 deletions
diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c index 975cdcb..56abc39 100644 --- a/drivers/staging/iio/adc/ad799x_ring.c +++ b/drivers/staging/iio/adc/ad799x_ring.c @@ -73,8 +73,6 @@ 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; /* * Need to figure out the current mode based upon the requested @@ -84,15 +82,19 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev) if (st->id == ad7997 || st->id == ad7998) ad799x_set_scan_mode(st, ring->scan_mask); - numvals = ring->scan_count; + st->d_size = ring->scan_count * 2; - if (ring->access.set_bytes_per_datum) { - d_size = numvals*2 + sizeof(s64); - if (d_size % 8) - d_size += 8 - (d_size % 8); - ring->access.set_bytes_per_datum(ring, d_size); + if (ring->scan_timestamp) { + st->d_size += sizeof(s64); + + if (st->d_size % sizeof(s64)) + st->d_size += sizeof(s64) - (st->d_size % sizeof(s64)); } + if (indio_dev->ring->access.set_bytes_per_datum) + indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring, + st->d_size); + return 0; } @@ -130,29 +132,13 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) s64 time_ns; __u8 *rxbuf; int b_sent; - size_t d_size; u8 cmd; - unsigned long numvals = ring->scan_count; - - /* Ensure the timestamp is 8 byte aligned */ - d_size = numvals*2 + sizeof(s64); - - if (d_size % sizeof(s64)) - d_size += sizeof(s64) - (d_size % sizeof(s64)); - /* Ensure only one copy of this function running at a time */ if (atomic_inc_return(&st->protect_ring) > 1) return; - /* Monitor mode prevents reading. Whilst not currently implemented - * might as well have this test in here in the meantime as it does - * no harm. - */ - if (numvals == 0) - return; - - rxbuf = kmalloc(d_size, GFP_KERNEL); + rxbuf = kmalloc(st->d_size, GFP_KERNEL); if (rxbuf == NULL) return; @@ -177,13 +163,15 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) } b_sent = i2c_smbus_read_i2c_block_data(st->client, - cmd, numvals*2, rxbuf); + cmd, ring->scan_count * 2, rxbuf); if (b_sent < 0) goto done; time_ns = iio_get_time_ns(); - memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns)); + if (ring->scan_timestamp) + memcpy(rxbuf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); ring->access.store_to(&ring_sw->buf, rxbuf, time_ns); done: @@ -213,6 +201,7 @@ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev) indio_dev->ring->preenable = &ad799x_ring_preenable; indio_dev->ring->postenable = &iio_triggered_ring_postenable; indio_dev->ring->predisable = &iio_triggered_ring_predisable; + indio_dev->ring->scan_timestamp = true; INIT_WORK(&st->poll_work, &ad799x_poll_bh_to_ring); |