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[80.116.51.172]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ac71961f9cfsm652288566b.122.2025.03.31.12.04.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Mar 2025 12:04:05 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Mon, 31 Mar 2025 21:02:46 +0200 Subject: [PATCH v2 3/5] iio: backend: add support for data source get Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250331-wip-bl-ad3552r-fixes-v2-3-cdedb430497e@baylibre.com> References: <20250331-wip-bl-ad3552r-fixes-v2-0-cdedb430497e@baylibre.com> In-Reply-To: <20250331-wip-bl-ad3552r-fixes-v2-0-cdedb430497e@baylibre.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Jonathan Cameron , Lars-Peter Clausen , Jonathan Corbet , Olivier Moysan , Michael Hennerich Cc: linux-iio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Angelo Dureghello X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3489; i=adureghello@baylibre.com; h=from:subject:message-id; bh=/X5T/C4urb1TZY56QZlmQtSfqpUWNyuJBZpY7qU/VIg=; b=owGbwMvMwCXGf3bn1e/btlsznlZLYkh/9exWLO9NLtcUtVlM7qU17WfY1ixYwFxg52M2r2TbR 8mzMQsFO0pZGMS4GGTFFFnqEiNMQm+HSikvYJwNM4eVCWQIAxenAExkzWdGhi7zfmOtmhAbnjXH 7jG9MvHIzUzuOSTifXPbiVy+7ye35jH84ThVW5VqeMwoRj7w7dtJZ//e8q3KMfVaHpi26/YOjtk qTAA= X-Developer-Key: i=adureghello@baylibre.com; a=openpgp; fpr=703CDFAD8B573EB00850E38366D1CB9419AF3953 From: Angelo Dureghello Add backend support for getting the data source used. The ad3552r HDL implements an internal ramp generator, so adding the getter to allow data source get/set by debugfs. Signed-off-by: Angelo Dureghello --- drivers/iio/industrialio-backend.c | 28 ++++++++++++++++++++++++++++ include/linux/iio/backend.h | 5 +++++ 2 files changed, 33 insertions(+) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index a43c8d1bb3d0f4dda4277cac94b0ea9232c071e4..c1eb9ef9db08aec8437d0d00cf77914ad6611b72 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -380,6 +380,34 @@ int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan, } EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_set, "IIO_BACKEND"); +/** + * iio_backend_data_source_get - Get current data source + * @back: Backend device + * @chan: Channel number + * @data: Pointer to receive the current source value + * + * A given backend may have different sources to stream/sync data. This allows + * to know what source is in use. + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan, + enum iio_backend_data_source *data) +{ + int ret; + + ret = iio_backend_op_call(back, data_source_get, chan, data); + if (ret) + return ret; + + if (*data >= IIO_BACKEND_DATA_SOURCE_MAX) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_get, "IIO_BACKEND"); + /** * iio_backend_set_sampling_freq - Set channel sampling rate * @back: Backend device diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index e45b7dfbec35c094942a3034fc6057a7960b9772..e59d909cb65924b4872cadd4b7e5e894c13c189f 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -84,6 +84,7 @@ enum iio_backend_interface_type { * @chan_disable: Disable one channel. * @data_format_set: Configure the data format for a specific channel. * @data_source_set: Configure the data source for a specific channel. + * @data_source_get: Data source getter for a specific channel. * @set_sample_rate: Configure the sampling rate for a specific channel. * @test_pattern_set: Configure a test pattern. * @chan_status: Get the channel status. @@ -115,6 +116,8 @@ struct iio_backend_ops { const struct iio_backend_data_fmt *data); int (*data_source_set)(struct iio_backend *back, unsigned int chan, enum iio_backend_data_source data); + int (*data_source_get)(struct iio_backend *back, unsigned int chan, + enum iio_backend_data_source *data); int (*set_sample_rate)(struct iio_backend *back, unsigned int chan, u64 sample_rate_hz); int (*test_pattern_set)(struct iio_backend *back, @@ -176,6 +179,8 @@ int iio_backend_data_format_set(struct iio_backend *back, unsigned int chan, const struct iio_backend_data_fmt *data); int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan, enum iio_backend_data_source data); +int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan, + enum iio_backend_data_source *data); int iio_backend_set_sampling_freq(struct iio_backend *back, unsigned int chan, u64 sample_rate_hz); int iio_backend_test_pattern_set(struct iio_backend *back,