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[69.109.179.158]) by smtp.gmail.com with ESMTPSA id f10-20020ac8464a000000b003bd0e7ff466sm1900995qto.7.2023.03.11.05.40.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Mar 2023 05:40:25 -0800 (PST) From: William Breathitt Gray To: jic23@kernel.org, lars@metafoo.de Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, William Breathitt Gray , Andy Shevchenko Subject: [PATCH] iio: dac: cio-dac: Migrate to the regmap API Date: Sat, 11 Mar 2023 08:40:12 -0500 Message-Id: <20230311134012.70822-1-william.gray@linaro.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The regmap API supports IO port accessors so we can take advantage of regmap abstractions rather than handling access to the device registers directly in the driver. Suggested-by: Andy Shevchenko Signed-off-by: William Breathitt Gray --- drivers/iio/dac/Kconfig | 1 + drivers/iio/dac/cio-dac.c | 71 +++++++++++++++++++++++++++++---------- 2 files changed, 54 insertions(+), 18 deletions(-) diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index d3f90cf86143..3acd9c3f388e 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -277,6 +277,7 @@ config CIO_DAC tristate "Measurement Computing CIO-DAC IIO driver" depends on X86 && (ISA_BUS || PC104) select ISA_BUS_API + select REGMAP_MMIO help Say yes here to build support for the Measurement Computing CIO-DAC analog output device family (CIO-DAC16, CIO-DAC08, PC104-DAC06). The diff --git a/drivers/iio/dac/cio-dac.c b/drivers/iio/dac/cio-dac.c index 791dd999cf29..13438f022f8e 100644 --- a/drivers/iio/dac/cio-dac.c +++ b/drivers/iio/dac/cio-dac.c @@ -6,16 +6,15 @@ * This driver supports the following Measurement Computing devices: CIO-DAC16, * CIO-DAC06, and PC104-DAC06. */ -#include +#include #include -#include +#include #include #include -#include -#include #include #include #include +#include #include #define CIO_DAC_NUM_CHAN 16 @@ -35,25 +34,51 @@ static unsigned int num_cio_dac; module_param_hw_array(base, uint, ioport, &num_cio_dac, 0); MODULE_PARM_DESC(base, "Measurement Computing CIO-DAC base addresses"); +#define CIO_DAC_BASE 0x00 +#define CIO_DAC_CHANNEL_STRIDE 2 + +static bool cio_dac_precious_reg(struct device *dev, unsigned int reg) +{ + /* + * All registers are considered precious; if the XFER jumper is set on + * the device, then no update occurs until a DAC register is read. + */ + return true; +} + +static const struct regmap_config cio_dac_regmap_config = { + .reg_bits = 16, + .reg_stride = 2, + .val_bits = 16, + .io_port = true, + .max_register = 0x1F, + .precious_reg = cio_dac_precious_reg, +}; + /** * struct cio_dac_iio - IIO device private data structure - * @chan_out_states: channels' output states - * @base: base memory address of the DAC device + * @map: Regmap for the device */ struct cio_dac_iio { - int chan_out_states[CIO_DAC_NUM_CHAN]; - u16 __iomem *base; + struct regmap *map; }; static int cio_dac_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct cio_dac_iio *const priv = iio_priv(indio_dev); + const unsigned int offset = chan->channel * CIO_DAC_CHANNEL_STRIDE; + int err; + unsigned int dac_val; if (mask != IIO_CHAN_INFO_RAW) return -EINVAL; - *val = priv->chan_out_states[chan->channel]; + err = regmap_read(priv->map, CIO_DAC_BASE + offset, &dac_val); + if (err) + return err; + + *val = dac_val; return IIO_VAL_INT; } @@ -62,6 +87,7 @@ static int cio_dac_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct cio_dac_iio *const priv = iio_priv(indio_dev); + const unsigned int offset = chan->channel * CIO_DAC_CHANNEL_STRIDE; if (mask != IIO_CHAN_INFO_RAW) return -EINVAL; @@ -70,10 +96,7 @@ static int cio_dac_write_raw(struct iio_dev *indio_dev, if ((unsigned int)val > 65535) return -EINVAL; - priv->chan_out_states[chan->channel] = val; - iowrite16(val, priv->base + chan->channel); - - return 0; + return regmap_write(priv->map, CIO_DAC_BASE + offset, val); } static const struct iio_info cio_dac_info = { @@ -92,7 +115,10 @@ static int cio_dac_probe(struct device *dev, unsigned int id) { struct iio_dev *indio_dev; struct cio_dac_iio *priv; + void __iomem *regs; unsigned int i; + unsigned int offset; + int err; indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); if (!indio_dev) @@ -105,11 +131,16 @@ static int cio_dac_probe(struct device *dev, unsigned int id) return -EBUSY; } - priv = iio_priv(indio_dev); - priv->base = devm_ioport_map(dev, base[id], CIO_DAC_EXTENT); - if (!priv->base) + regs = devm_ioport_map(dev, base[id], CIO_DAC_EXTENT); + if (!regs) return -ENOMEM; + priv = iio_priv(indio_dev); + priv->map = devm_regmap_init_mmio(dev, regs, &cio_dac_regmap_config); + if (IS_ERR(priv->map)) + return dev_err_probe(dev, PTR_ERR(priv->map), + "Unable to initialize register map\n"); + indio_dev->info = &cio_dac_info; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = cio_dac_channels; @@ -117,8 +148,12 @@ static int cio_dac_probe(struct device *dev, unsigned int id) indio_dev->name = dev_name(dev); /* initialize DAC outputs to 0V */ - for (i = 0; i < CIO_DAC_NUM_CHAN; i++) - iowrite16(0, priv->base + i); + for (i = 0; i < CIO_DAC_NUM_CHAN; i++) { + offset = i * CIO_DAC_CHANNEL_STRIDE; + err = regmap_write(priv->map, CIO_DAC_BASE + offset, 0); + if (err) + return err; + } return devm_iio_device_register(dev, indio_dev); } base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6 -- 2.39.2