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[87.8.62.49]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3997f9955c0sm3258380f8f.3.2025.03.21.13.30.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Mar 2025 13:30:09 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Date: Fri, 21 Mar 2025 21:28:51 +0100 Subject: [PATCH 4/4] iio: dac: ad3552r-hs: add support for internal ramp Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250321-wip-bl-ad3552r-fixes-v1-4-3c1aa249d163@baylibre.com> References: <20250321-wip-bl-ad3552r-fixes-v1-0-3c1aa249d163@baylibre.com> In-Reply-To: <20250321-wip-bl-ad3552r-fixes-v1-0-3c1aa249d163@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 From: Angelo Dureghello The ad3552r can be feeded from the HDL controller by an internally generated 16bit ramp, useful for debug pourposes. Add debugfs a file to enable or disable it. Signed-off-by: Angelo Dureghello --- drivers/iio/dac/ad3552r-hs.c | 106 +++++++++++++++++++++++++++++++++++++++= +--- 1 file changed, 100 insertions(+), 6 deletions(-) diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c index 37397e188f225a8099745ec03f7c604da76960b1..41fe78d982a68980db059b095fc= 27b37ea1a461b 100644 --- a/drivers/iio/dac/ad3552r-hs.c +++ b/drivers/iio/dac/ad3552r-hs.c @@ -7,6 +7,7 @@ */ =20 #include +#include #include #include #include @@ -65,6 +66,18 @@ static int ad3552r_hs_reg_read(struct ad3552r_hs_state *= st, u32 reg, u32 *val, return st->data->bus_reg_read(st->back, reg, val, xfer_size); } =20 +static int ad3552r_hs_set_data_source(struct ad3552r_hs_state *st, + enum iio_backend_data_source type) +{ + int ret; + + ret =3D iio_backend_data_source_set(st->back, 0, type); + if (ret) + return ret; + + return iio_backend_data_source_set(st->back, 1, type); +} + static int ad3552r_hs_update_reg_bits(struct ad3552r_hs_state *st, u32 reg, u32 mask, u32 val, size_t xfer_size) { @@ -483,6 +496,66 @@ static int ad3552r_hs_reg_access(struct iio_dev *indio= _dev, unsigned int reg, return st->data->bus_reg_write(st->back, reg, writeval, 1); } =20 +static ssize_t ad3552r_hs_show_data_source(struct file *f, char __user *us= erbuf, + size_t count, loff_t *ppos) +{ + struct ad3552r_hs_state *st =3D file_inode(f)->i_private; + enum iio_backend_data_source type; + int ret; + + ret =3D iio_backend_data_source_get(st->back, 0, &type); + if (ret) + return ret; + + switch (type) { + case IIO_BACKEND_INTERNAL_RAMP_16BIT: + return simple_read_from_buffer(userbuf, count, ppos, + "backend-ramp-generator", 22); + case IIO_BACKEND_EXTERNAL: + return simple_read_from_buffer(userbuf, count, ppos, + "iio-buffer", 10); + default: + return -EINVAL; + } +} + +static ssize_t ad3552r_hs_write_data_source(struct file *f, + const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct ad3552r_hs_state *st =3D file_inode(f)->i_private; + char buf[64]; + int ret; + + ret =3D simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, + count); + if (ret < 0) + return ret; + + buf[count] =3D 0; + + if (count =3D=3D 10 && !strncmp(buf, "iio-buffer", 10)) { + ret =3D ad3552r_hs_set_data_source(st, IIO_BACKEND_EXTERNAL); + if (ret) + return ret; + } else if (count =3D=3D 22 && !strncmp(buf, "backend-ramp-generator", 22)= ) { + ret =3D ad3552r_hs_set_data_source(st, + IIO_BACKEND_INTERNAL_RAMP_16BIT); + if (ret) + return ret; + } else { + return -EINVAL; + } + + return count; +} + +static const struct file_operations ad3552r_hs_data_source_fops =3D { + .owner =3D THIS_MODULE, + .write =3D ad3552r_hs_write_data_source, + .read =3D ad3552r_hs_show_data_source, +}; + static int ad3552r_hs_setup(struct ad3552r_hs_state *st) { u16 id; @@ -550,11 +623,7 @@ static int ad3552r_hs_setup(struct ad3552r_hs_state *s= t) if (ret) return ret; =20 - ret =3D iio_backend_data_source_set(st->back, 0, IIO_BACKEND_EXTERNAL); - if (ret) - return ret; - - ret =3D iio_backend_data_source_set(st->back, 1, IIO_BACKEND_EXTERNAL); + ret =3D ad3552r_hs_set_data_source(st, IIO_BACKEND_EXTERNAL); if (ret) return ret; =20 @@ -661,6 +730,24 @@ static const struct iio_info ad3552r_hs_info =3D { .debugfs_reg_access =3D &ad3552r_hs_reg_access, }; =20 +static void ad3552r_hs_debugfs_init(struct iio_dev *indio_dev) +{ + struct ad3552r_hs_state *st =3D iio_priv(indio_dev); + struct dentry *d =3D iio_get_debugfs_dentry(indio_dev); + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return; + + d =3D iio_get_debugfs_dentry(indio_dev); + if (!d) { + dev_warn(st->dev, "can't set debugfs in driver dir\n"); + return; + } + + debugfs_create_file("data_source", 0600, d, st, + &ad3552r_hs_data_source_fops); +} + static int ad3552r_hs_probe(struct platform_device *pdev) { struct ad3552r_hs_state *st; @@ -705,7 +792,14 @@ static int ad3552r_hs_probe(struct platform_device *pd= ev) if (ret) return ret; =20 - return devm_iio_device_register(&pdev->dev, indio_dev); + ret =3D devm_iio_device_register(&pdev->dev, indio_dev); + if (ret) + return ret; + + ad3552r_hs_debugfs_init(indio_dev); + + return ret; + } =20 static const struct of_device_id ad3552r_hs_of_id[] =3D { --=20 2.49.0