From: Mihail Chindris <mihail.chindris@analog.com>
To: <linux-kernel@vger.kernel.org>, <linux-iio@vger.kernel.org>
Cc: <lars@metafoo.de>, <Michael.Hennerich@analog.com>,
<jic23@kernel.org>, <nuno.sa@analog.com>,
<dragos.bogdan@analog.com>, <alexandru.ardelean@analog.com>,
Mihail Chindris <mihail.chindris@analog.com>
Subject: [PATCH v5 2/6] iio: kfifo-buffer: Add output buffer support
Date: Thu, 16 Sep 2021 18:29:10 +0000 [thread overview]
Message-ID: <20210916182914.1810-3-mihail.chindris@analog.com> (raw)
In-Reply-To: <20210916182914.1810-1-mihail.chindris@analog.com>
From: Lars-Peter Clausen <lars@metafoo.de>
Add output buffer support to the kfifo buffer implementation.
The implementation is straight forward and mostly just wraps the kfifo
API to provide the required operations.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Mihail Chindris <mihail.chindris@analog.com>
---
drivers/iio/buffer/kfifo_buf.c | 50 ++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/drivers/iio/buffer/kfifo_buf.c b/drivers/iio/buffer/kfifo_buf.c
index 516eb3465de1..7368db2d5c32 100644
--- a/drivers/iio/buffer/kfifo_buf.c
+++ b/drivers/iio/buffer/kfifo_buf.c
@@ -138,10 +138,60 @@ static void iio_kfifo_buffer_release(struct iio_buffer *buffer)
kfree(kf);
}
+static size_t iio_kfifo_buf_space_available(struct iio_buffer *r)
+{
+ struct iio_kfifo *kf = iio_to_kfifo(r);
+ size_t avail;
+
+ mutex_lock(&kf->user_lock);
+ avail = kfifo_avail(&kf->kf);
+ mutex_unlock(&kf->user_lock);
+
+ return avail;
+}
+
+static int iio_kfifo_remove_from(struct iio_buffer *r, void *data)
+{
+ int ret;
+ struct iio_kfifo *kf = iio_to_kfifo(r);
+
+ if (kfifo_size(&kf->kf) < 1)
+ return -EBUSY;
+
+ ret = kfifo_out(&kf->kf, data, 1);
+ if (ret != 1)
+ return -EBUSY;
+
+ wake_up_interruptible_poll(&r->pollq, POLLOUT | POLLWRNORM);
+
+ return 0;
+}
+
+static int iio_kfifo_write(struct iio_buffer *r, size_t n,
+ const char __user *buf)
+{
+ struct iio_kfifo *kf = iio_to_kfifo(r);
+ int ret, copied;
+
+ mutex_lock(&kf->user_lock);
+ if (!kfifo_initialized(&kf->kf) || n < kfifo_esize(&kf->kf))
+ ret = -EINVAL;
+ else
+ ret = kfifo_from_user(&kf->kf, buf, n, &copied);
+ mutex_unlock(&kf->user_lock);
+ if (ret)
+ return ret;
+
+ return copied;
+}
+
static const struct iio_buffer_access_funcs kfifo_access_funcs = {
.store_to = &iio_store_to_kfifo,
.read = &iio_read_kfifo,
.data_available = iio_kfifo_buf_data_available,
+ .remove_from = &iio_kfifo_remove_from,
+ .write = &iio_kfifo_write,
+ .space_available = &iio_kfifo_buf_space_available,
.request_update = &iio_request_update_kfifo,
.set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,
.set_length = &iio_set_length_kfifo,
--
2.27.0
next prev parent reply other threads:[~2021-09-16 18:29 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-16 18:29 [PATCH v5 0/6] iio: Add output buffer support Mihail Chindris
2021-09-16 18:29 ` [PATCH v5 1/6] " Mihail Chindris
2021-09-19 17:02 ` Jonathan Cameron
2021-09-20 8:02 ` Sa, Nuno
2021-09-20 18:04 ` Jonathan Cameron
2021-09-16 18:29 ` Mihail Chindris [this message]
2021-09-16 18:29 ` [PATCH v5 3/6] iio: triggered-buffer: extend support to configure output buffers Mihail Chindris
2021-09-19 17:05 ` Jonathan Cameron
2021-09-16 18:29 ` [PATCH v5 4/6] drivers: iio: dac: ad5766: Fix dt property name Mihail Chindris
2021-09-17 7:53 ` Alexandru Ardelean
2021-09-19 17:11 ` Jonathan Cameron
2021-09-16 18:29 ` [PATCH v5 5/6] Documentation:devicetree:bindings:iio:dac: Fix val Mihail Chindris
2021-09-17 7:53 ` Alexandru Ardelean
2021-09-19 17:12 ` Jonathan Cameron
2021-09-16 18:29 ` [PATCH v5 6/6] drivers:iio:dac:ad5766.c: Add trigger buffer Mihail Chindris
2021-09-17 8:08 ` Alexandru Ardelean
2021-09-19 17:30 ` Jonathan Cameron
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