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authorAlexandru Ardelean <alexandru.ardelean@analog.com>2021-02-15 12:40:38 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2021-03-11 20:47:05 +0000
commitee708e6baacd3afdace9b721c25fbbe106cebb94 (patch)
tree7fd06b180083cac6b9649064d9ce592ebbae3c27 /drivers/iio/iio_core.h
parent738f6ba1180046904402ffbe210fbd2fa2c4b050 (diff)
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iio: buffer: introduce support for attaching more IIO buffers
With this change, calling iio_device_attach_buffer() will actually attach more buffers. Right now this doesn't do any validation of whether a buffer is attached twice; maybe that can be added later (if needed). Attaching a buffer more than once should yield noticeably bad results. The first buffer is the legacy buffer, so a reference is kept to it. At this point, accessing the data for the extra buffers (that are added after the first one) isn't possible yet. The iio_device_attach_buffer() is also changed to return an error code, which for now is -ENOMEM if the array could not be realloc-ed for more buffers. To adapt to this new change iio_device_attach_buffer() is called last in all place where it's called. The realloc failure is a bit difficult to handle during un-managed calls when unwinding, so it's better to have this as the last error in the setup_buffer calls. At this point, no driver should call iio_device_attach_buffer() directly, it should call one of the {devm_}iio_triggered_buffer_setup() or devm_iio_kfifo_buffer_setup() or devm_iio_dmaengine_buffer_setup() functions. This makes iio_device_attach_buffer() a bit easier to handle. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Link: https://lore.kernel.org/r/20210215104043.91251-20-alexandru.ardelean@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/iio_core.h')
-rw-r--r--drivers/iio/iio_core.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
index 87868fff7d37..7990c759f1f5 100644
--- a/drivers/iio/iio_core.h
+++ b/drivers/iio/iio_core.h
@@ -69,29 +69,31 @@ __poll_t iio_buffer_poll(struct file *filp,
ssize_t iio_buffer_read_outer(struct file *filp, char __user *buf,
size_t n, loff_t *f_ps);
-int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
-void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev);
+int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
+void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev);
#define iio_buffer_poll_addr (&iio_buffer_poll)
#define iio_buffer_read_outer_addr (&iio_buffer_read_outer)
void iio_disable_all_buffers(struct iio_dev *indio_dev);
void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
+void iio_buffers_put(struct iio_dev *indio_dev);
#else
#define iio_buffer_poll_addr NULL
#define iio_buffer_read_outer_addr NULL
-static inline int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
+static inline int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
{
return 0;
}
-static inline void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
+static inline void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
+static inline void iio_buffers_put(struct iio_dev *indio_dev) {}
#endif