On Wed, 17 Oct 2018 22:37:37 +0200 Charles-Antoine Couret <charles-antoine.couret@xxxxxxxxxxxxx> wrote: > Datasheet of this chip: > http://www.ti.com/lit/ds/symlink/dac7311.pdf > > Signed-off-by: Charles-Antoine Couret <charles-antoine.couret@xxxxxxxxxxxxx> Hi Charles-Antoine. Something slightly odd happened with the title of this patch. Also, I assume it is a V2? Then it should have [PATCH V2 1/2]... > --- Here is where we would expect to see a list of updates made from V1. Other than that procedural stuff, looks good to me. I'll leave it on the list for a little longer though and I think you'll end up doing a v3 to tidy up the DT binding example. Thanks, Jonathan > drivers/iio/dac/Kconfig | 9 + > drivers/iio/dac/Makefile | 1 + > drivers/iio/dac/ti-dac7311.c | 341 +++++++++++++++++++++++++++++++++++ > 3 files changed, 351 insertions(+) > create mode 100644 drivers/iio/dac/ti-dac7311.c > > diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig > index 80beb64e9e0c..ac205c8f5de0 100644 > --- a/drivers/iio/dac/Kconfig > +++ b/drivers/iio/dac/Kconfig > @@ -356,6 +356,15 @@ config TI_DAC5571 > > If compiled as a module, it will be called ti-dac5571. > > +config TI_DAC7311 > + tristate "Texas Instruments 8/10/12-bit 1-channel DAC driver" > + depends on SPI > + help > + Driver for the Texas Instruments > + DAC7311, DAC6311, DAC5311. > + > + If compiled as a module, it will be called ti-dac7311. > + > config VF610_DAC > tristate "Vybrid vf610 DAC driver" > depends on OF > diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile > index a1b37cf99441..4b02021cc30f 100644 > --- a/drivers/iio/dac/Makefile > +++ b/drivers/iio/dac/Makefile > @@ -39,4 +39,5 @@ obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o > obj-$(CONFIG_STM32_DAC) += stm32-dac.o > obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o > obj-$(CONFIG_TI_DAC5571) += ti-dac5571.o > +obj-$(CONFIG_TI_DAC7311) += ti-dac7311.o > obj-$(CONFIG_VF610_DAC) += vf610_dac.o > diff --git a/drivers/iio/dac/ti-dac7311.c b/drivers/iio/dac/ti-dac7311.c > new file mode 100644 > index 000000000000..2010bf27c371 > --- /dev/null > +++ b/drivers/iio/dac/ti-dac7311.c > @@ -0,0 +1,341 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* ti-dac7311.c - Texas Instruments 8/10/12-bit 1-channel DAC driver > + * > + * Copyright (C) 2018 CMC NV > + * > + * http://www.ti.com/lit/ds/symlink/dac7311.pdf > + */ > + > +#include <linux/iio/iio.h> > +#include <linux/module.h> > +#include <linux/regulator/consumer.h> > +#include <linux/spi/spi.h> > + > +enum { > + ID_DAC5311 = 0, > + ID_DAC6311, > + ID_DAC7311, > +}; > + > +enum { > + POWER_1KOHM_TO_GND = 0, > + POWER_100KOHM_TO_GND, > + POWER_TRI_STATE, > +}; > + > +struct ti_dac_spec { > + u8 resolution; > +}; > + > +static const struct ti_dac_spec ti_dac_spec[] = { > + [ID_DAC5311] = { .resolution = 8 }, > + [ID_DAC6311] = { .resolution = 10 }, > + [ID_DAC7311] = { .resolution = 12 }, > +}; > + > +/** > + * struct ti_dac_chip - TI DAC chip > + * @lock: protects write sequences > + * @vref: regulator generating Vref > + * @spi: SPI device to send data to the device > + * @val: cached value > + * @powerdown: whether the chip is powered down > + * @powerdown_mode: selected by the user > + * @resolution: resolution of the chip > + * @buf: buffer for transfer data > + */ > +struct ti_dac_chip { > + struct mutex lock; > + struct regulator *vref; > + struct spi_device *spi; > + u16 val; > + bool powerdown; > + u8 powerdown_mode; > + u8 resolution; > + u8 buf[2] ____cacheline_aligned; > +}; > + > +static u8 ti_dac_get_power(struct ti_dac_chip *ti_dac, bool powerdown) > +{ > + if (powerdown) > + return ti_dac->powerdown_mode + 1; > + > + return 0; > +} > + > +static int ti_dac_cmd(struct ti_dac_chip *ti_dac, u8 power, u16 val) > +{ > + u8 shift = 14 - ti_dac->resolution; > + > + ti_dac->buf[0] = (val << shift) & 0xFF; > + ti_dac->buf[1] = (power << 6) | (val >> (8 - shift)); > + return spi_write(ti_dac->spi, ti_dac->buf, 2); > +} > + > +static const char * const ti_dac_powerdown_modes[] = { > + "1kohm_to_gnd", > + "100kohm_to_gnd", > + "three_state", > +}; > + > +static int ti_dac_get_powerdown_mode(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan) > +{ > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + > + return ti_dac->powerdown_mode; > +} > + > +static int ti_dac_set_powerdown_mode(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + unsigned int mode) > +{ > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + > + ti_dac->powerdown_mode = mode; > + return 0; > +} > + > +static const struct iio_enum ti_dac_powerdown_mode = { > + .items = ti_dac_powerdown_modes, > + .num_items = ARRAY_SIZE(ti_dac_powerdown_modes), > + .get = ti_dac_get_powerdown_mode, > + .set = ti_dac_set_powerdown_mode, > +}; > + > +static ssize_t ti_dac_read_powerdown(struct iio_dev *indio_dev, > + uintptr_t private, > + const struct iio_chan_spec *chan, > + char *buf) > +{ > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + > + return sprintf(buf, "%d\n", ti_dac->powerdown); > +} > + > +static ssize_t ti_dac_write_powerdown(struct iio_dev *indio_dev, > + uintptr_t private, > + const struct iio_chan_spec *chan, > + const char *buf, size_t len) > +{ > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + bool powerdown; > + u8 power; > + int ret; > + > + ret = strtobool(buf, &powerdown); > + if (ret) > + return ret; > + > + power = ti_dac_get_power(ti_dac, powerdown); > + > + mutex_lock(&ti_dac->lock); > + ret = ti_dac_cmd(ti_dac, power, 0); > + if (!ret) > + ti_dac->powerdown = powerdown; > + mutex_unlock(&ti_dac->lock); > + > + return ret ? ret : len; > +} > + > +static const struct iio_chan_spec_ext_info ti_dac_ext_info[] = { > + { > + .name = "powerdown", > + .read = ti_dac_read_powerdown, > + .write = ti_dac_write_powerdown, > + .shared = IIO_SHARED_BY_TYPE, > + }, > + IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &ti_dac_powerdown_mode), > + IIO_ENUM_AVAILABLE("powerdown_mode", &ti_dac_powerdown_mode), > + { }, > +}; > + > +#define TI_DAC_CHANNEL(chan) { \ > + .type = IIO_VOLTAGE, \ > + .channel = (chan), \ > + .output = true, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ > + .ext_info = ti_dac_ext_info, \ > +} > + > +static const struct iio_chan_spec ti_dac_channels[] = { > + TI_DAC_CHANNEL(0), > +}; > + > +static int ti_dac_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + *val = ti_dac->val; > + return IIO_VAL_INT; > + > + case IIO_CHAN_INFO_SCALE: > + ret = regulator_get_voltage(ti_dac->vref); > + if (ret < 0) > + return ret; > + > + *val = ret / 1000; > + *val2 = ti_dac->resolution; > + return IIO_VAL_FRACTIONAL_LOG2; > + } > + > + return -EINVAL; > +} > + > +static int ti_dac_write_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int val, int val2, long mask) > +{ > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + u8 power = ti_dac_get_power(ti_dac, ti_dac->powerdown); > + int ret; > + > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + if (ti_dac->val == val) > + return 0; > + > + if (val >= (1 << ti_dac->resolution) || val < 0) > + return -EINVAL; > + > + if (ti_dac->powerdown) > + return -EBUSY; > + > + mutex_lock(&ti_dac->lock); > + ret = ti_dac_cmd(ti_dac, power, val); > + if (!ret) > + ti_dac->val = val; > + mutex_unlock(&ti_dac->lock); > + break; > + > + default: > + ret = -EINVAL; > + } > + > + return ret; > +} > + > +static int ti_dac_write_raw_get_fmt(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, long mask) > +{ > + return IIO_VAL_INT; > +} > + > +static const struct iio_info ti_dac_info = { > + .read_raw = ti_dac_read_raw, > + .write_raw = ti_dac_write_raw, > + .write_raw_get_fmt = ti_dac_write_raw_get_fmt, > +}; > + > +static int ti_dac_probe(struct spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + const struct ti_dac_spec *spec; > + struct ti_dac_chip *ti_dac; > + struct iio_dev *indio_dev; > + int ret; > + > + indio_dev = devm_iio_device_alloc(dev, sizeof(*ti_dac)); > + if (!indio_dev) { > + dev_err(dev, "can not allocate iio device\n"); > + return -ENOMEM; > + } > + > + spi->max_speed_hz = 50000000; > + spi->mode = SPI_MODE_1; > + spi->bits_per_word = 16; > + spi_setup(spi); > + > + indio_dev->dev.parent = dev; > + indio_dev->dev.of_node = spi->dev.of_node; > + indio_dev->info = &ti_dac_info; > + indio_dev->name = spi_get_device_id(spi)->name; > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->channels = ti_dac_channels; > + spi_set_drvdata(spi, indio_dev); > + > + ti_dac = iio_priv(indio_dev); > + ti_dac->powerdown = false; > + ti_dac->spi = spi; > + > + spec = &ti_dac_spec[spi_get_device_id(spi)->driver_data]; > + indio_dev->num_channels = 1; > + ti_dac->resolution = spec->resolution; > + > + ti_dac->vref = devm_regulator_get(dev, "vref"); > + if (IS_ERR(ti_dac->vref)) { > + dev_err(dev, "error to get regulator\n"); > + return PTR_ERR(ti_dac->vref); > + } > + > + ret = regulator_enable(ti_dac->vref); > + if (ret < 0) { > + dev_err(dev, "can not enable regulator\n"); > + return ret; > + } > + > + mutex_init(&ti_dac->lock); > + > + ret = iio_device_register(indio_dev); > + if (ret) { > + dev_err(dev, "fail to register iio device: %d\n", ret); > + goto err; > + } > + > + return 0; > + > +err: > + mutex_destroy(&ti_dac->lock); > + regulator_disable(ti_dac->vref); > + return ret; > +} > + > +static int ti_dac_remove(struct spi_device *spi) > +{ > + struct iio_dev *indio_dev = spi_get_drvdata(spi); > + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); > + > + iio_device_unregister(indio_dev); > + mutex_destroy(&ti_dac->lock); > + regulator_disable(ti_dac->vref); > + return 0; > +} > + > +#ifdef CONFIG_OF > +static const struct of_device_id ti_dac_of_id[] = { > + { .compatible = "ti,dac5311" }, > + { .compatible = "ti,dac6311" }, > + { .compatible = "ti,dac7311" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, ti_dac_of_id); > +#endif > + > +static const struct spi_device_id ti_dac_spi_id[] = { > + { "dac5311", ID_DAC5311 }, > + { "dac6311", ID_DAC6311 }, > + { "dac7311", ID_DAC7311 }, > + { } > +}; > +MODULE_DEVICE_TABLE(spi, ti_dac_spi_id); > + > +static struct spi_driver ti_dac_driver = { > + .driver = { > + .name = "ti-dac7311", > + .of_match_table = of_match_ptr(ti_dac_of_id), > + }, > + .probe = ti_dac_probe, > + .remove = ti_dac_remove, > + .id_table = ti_dac_spi_id, > +}; > +module_spi_driver(ti_dac_driver); > + > +MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@xxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1-channel DAC driver"); > +MODULE_LICENSE("GPL v2");
