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Sat, 19 Apr 2025 06:56:43 -0700 (PDT) From: Gabriel Shahrouzi To: gregkh@linuxfoundation.org, jic23@kernel.org, lars@metafoo.de, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, Michael.Hennerich@analog.com, sonic.zhang@analog.com, vapier@gentoo.org Cc: gshahrouzi@gmail.com, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linux.dev Subject: [PATCH 3/5] staging: iio: adc: ad7816: Introduce chip_info and use pointer matching Date: Sat, 19 Apr 2025 09:56:36 -0400 Message-ID: <20250419135638.810070-4-gshahrouzi@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250419135638.810070-1-gshahrouzi@gmail.com> References: <20250419135638.810070-1-gshahrouzi@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce struct ad7816_chip_info to centralize static properties (e.g. name, max channels) that differ between chip variants (AD7816/7/8) but are constant for any specific type. Store pointers to these instances in the of_device_id (.data) and spi_device_id (driver_data) tables. Retrieve the pointer in probe() using the firmware-independent device_get_match_data() and store it in the ad7816_state struct. Signed-off-by: Gabriel Shahrouzi --- drivers/staging/iio/adc/ad7816.c | 55 +++++++++++++++++++++----------- 1 file changed, 37 insertions(+), 18 deletions(-) diff --git a/drivers/staging/iio/adc/ad7816.c b/drivers/staging/iio/adc/ad7= 816.c index cad2e55aff3f9..39310ade770d0 100644 --- a/drivers/staging/iio/adc/ad7816.c +++ b/drivers/staging/iio/adc/ad7816.c @@ -41,8 +41,28 @@ * struct ad7816_state - chip specific information */ =20 +struct ad7816_chip_info { + const char *name; + u8 max_channels; +}; + +static const struct ad7816_chip_info ad7816_info_ad7816 =3D { + .name =3D "ad7816", + .max_channels =3D 0, +}; + +static const struct ad7816_chip_info ad7817_info_ad7817 =3D { + .name =3D "ad7817", + .max_channels =3D 3, +}; + +static const struct ad7816_chip_info ad7818_info_ad7818 =3D { + .name =3D "ad7818", + .max_channels =3D 1, +}; + struct ad7816_state { - kernel_ulong_t id; + const struct ad7816_chip_info *chip_info; struct spi_device *spi_dev; struct gpio_desc *rdwr_pin; struct gpio_desc *convert_pin; @@ -52,12 +72,6 @@ struct ad7816_state { u8 mode; }; =20 -enum ad7816_type { - ID_AD7816, - ID_AD7817, - ID_AD7818, -}; - /* * ad7816 data access by SPI */ @@ -84,7 +98,7 @@ static int ad7816_spi_read(struct ad7816_state *chip, u16= *data) gpiod_set_value(chip->convert_pin, 1); } =20 - if (chip->id =3D=3D ID_AD7816 || chip->id =3D=3D ID_AD7817) { + if (chip->chip_info =3D=3D &ad7816_info_ad7816 || chip->chip_info =3D=3D = &ad7817_info_ad7817) { while (gpiod_get_value(chip->busy_pin)) cpu_relax(); } @@ -353,6 +367,7 @@ static int ad7816_probe(struct spi_device *spi_dev) { struct ad7816_state *chip; struct iio_dev *indio_dev; + const struct ad7816_chip_info *info; int i, ret; =20 indio_dev =3D devm_iio_device_alloc(&spi_dev->dev, sizeof(*chip)); @@ -362,11 +377,15 @@ static int ad7816_probe(struct spi_device *spi_dev) /* this is only used for device removal purposes */ dev_set_drvdata(&spi_dev->dev, indio_dev); =20 + info =3D device_get_match_data(&spi_dev->dev); + if (!info) + return -ENODEV; + chip->chip_info =3D info; + chip->spi_dev =3D spi_dev; for (i =3D 0; i <=3D AD7816_CS_MAX; i++) chip->oti_data[i] =3D 203; =20 - chip->id =3D spi_get_device_id(spi_dev)->driver_data; chip->rdwr_pin =3D devm_gpiod_get(&spi_dev->dev, "rdwr", GPIOD_OUT_HIGH); if (IS_ERR(chip->rdwr_pin)) { ret =3D PTR_ERR(chip->rdwr_pin); @@ -382,7 +401,7 @@ static int ad7816_probe(struct spi_device *spi_dev) ret); return ret; } - if (chip->id =3D=3D ID_AD7816 || chip->id =3D=3D ID_AD7817) { + if (chip->chip_info =3D=3D &ad7816_info_ad7816 || chip->chip_info =3D=3D = &ad7817_info_ad7817) { chip->busy_pin =3D devm_gpiod_get(&spi_dev->dev, "busy", GPIOD_IN); if (IS_ERR(chip->busy_pin)) { @@ -393,7 +412,7 @@ static int ad7816_probe(struct spi_device *spi_dev) } } =20 - indio_dev->name =3D spi_get_device_id(spi_dev)->name; + indio_dev->name =3D chip->chip_info->name; indio_dev->info =3D &ad7816_info; indio_dev->modes =3D INDIO_DIRECT_MODE; =20 @@ -420,18 +439,18 @@ static int ad7816_probe(struct spi_device *spi_dev) } =20 static const struct of_device_id ad7816_of_match[] =3D { - { .compatible =3D "adi,ad7816", }, - { .compatible =3D "adi,ad7817", }, - { .compatible =3D "adi,ad7818", }, + { .compatible =3D "adi,ad7816", .data =3D &ad7816_info_ad7816 }, + { .compatible =3D "adi,ad7817", .data =3D &ad7817_info_ad7817 }, + { .compatible =3D "adi,ad7818", .data =3D &ad7818_info_ad7818 }, { } }; MODULE_DEVICE_TABLE(of, ad7816_of_match); =20 static const struct spi_device_id ad7816_id[] =3D { - { "ad7816", ID_AD7816 }, - { "ad7817", ID_AD7817 }, - { "ad7818", ID_AD7818 }, - {} + { "ad7816", (kernel_ulong_t)&ad7816_info_ad7816 }, + { "ad7817", (kernel_ulong_t)&ad7817_info_ad7817 }, + { "ad7818", (kernel_ulong_t)&ad7818_info_ad7818 }, + { } }; =20 MODULE_DEVICE_TABLE(spi, ad7816_id); --=20 2.43.0