iio:dac:ti-dac7311 Add driver for Texas Instrument DAC7311
It is a driver for Texas Instruments 8/10/12-bit 1-channel compatible with DAC6311 and DAC5311 chips. Datasheet of this chip: http://www.ti.com/lit/ds/symlink/dac7311.pdf Signed-off-by: Charles-Antoine Couret <charles-antoine.couret@essensium.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Charles-Antoine Couret
Jonathan Cameron
parent
03bd40033d
commit
7a02ef7907
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@ -366,6 +366,15 @@ config TI_DAC5571
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If compiled as a module, it will be called ti-dac5571.
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config TI_DAC7311
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tristate "Texas Instruments 8/10/12-bit 1-channel DAC driver"
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depends on SPI
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help
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Driver for the Texas Instruments
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DAC7311, DAC6311, DAC5311.
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If compiled as a module, it will be called ti-dac7311.
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config VF610_DAC
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tristate "Vybrid vf610 DAC driver"
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depends on OF
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@ -40,4 +40,5 @@ obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o
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obj-$(CONFIG_STM32_DAC) += stm32-dac.o
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obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o
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obj-$(CONFIG_TI_DAC5571) += ti-dac5571.o
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obj-$(CONFIG_TI_DAC7311) += ti-dac7311.o
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obj-$(CONFIG_VF610_DAC) += vf610_dac.o
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@ -0,0 +1,338 @@
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// SPDX-License-Identifier: GPL-2.0
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/* ti-dac7311.c - Texas Instruments 8/10/12-bit 1-channel DAC driver
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*
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* Copyright (C) 2018 CMC NV
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*
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* http://www.ti.com/lit/ds/symlink/dac7311.pdf
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*/
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#include <linux/iio/iio.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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enum {
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ID_DAC5311 = 0,
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ID_DAC6311,
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ID_DAC7311,
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};
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enum {
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POWER_1KOHM_TO_GND = 0,
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POWER_100KOHM_TO_GND,
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POWER_TRI_STATE,
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};
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struct ti_dac_spec {
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u8 resolution;
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};
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static const struct ti_dac_spec ti_dac_spec[] = {
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[ID_DAC5311] = { .resolution = 8 },
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[ID_DAC6311] = { .resolution = 10 },
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[ID_DAC7311] = { .resolution = 12 },
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};
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/**
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* struct ti_dac_chip - TI DAC chip
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* @lock: protects write sequences
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* @vref: regulator generating Vref
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* @spi: SPI device to send data to the device
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* @val: cached value
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* @powerdown: whether the chip is powered down
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* @powerdown_mode: selected by the user
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* @resolution: resolution of the chip
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* @buf: buffer for transfer data
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*/
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struct ti_dac_chip {
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struct mutex lock;
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struct regulator *vref;
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struct spi_device *spi;
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u16 val;
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bool powerdown;
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u8 powerdown_mode;
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u8 resolution;
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u8 buf[2] ____cacheline_aligned;
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};
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static u8 ti_dac_get_power(struct ti_dac_chip *ti_dac, bool powerdown)
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{
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if (powerdown)
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return ti_dac->powerdown_mode + 1;
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return 0;
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}
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static int ti_dac_cmd(struct ti_dac_chip *ti_dac, u8 power, u16 val)
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{
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u8 shift = 14 - ti_dac->resolution;
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ti_dac->buf[0] = (val << shift) & 0xFF;
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ti_dac->buf[1] = (power << 6) | (val >> (8 - shift));
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return spi_write(ti_dac->spi, ti_dac->buf, 2);
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}
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static const char * const ti_dac_powerdown_modes[] = {
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"1kohm_to_gnd",
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"100kohm_to_gnd",
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"three_state",
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};
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static int ti_dac_get_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
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{
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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return ti_dac->powerdown_mode;
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}
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static int ti_dac_set_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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unsigned int mode)
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{
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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ti_dac->powerdown_mode = mode;
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return 0;
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}
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static const struct iio_enum ti_dac_powerdown_mode = {
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.items = ti_dac_powerdown_modes,
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.num_items = ARRAY_SIZE(ti_dac_powerdown_modes),
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.get = ti_dac_get_powerdown_mode,
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.set = ti_dac_set_powerdown_mode,
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};
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static ssize_t ti_dac_read_powerdown(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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char *buf)
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{
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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return sprintf(buf, "%d\n", ti_dac->powerdown);
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}
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static ssize_t ti_dac_write_powerdown(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len)
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{
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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bool powerdown;
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u8 power;
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int ret;
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ret = strtobool(buf, &powerdown);
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if (ret)
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return ret;
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power = ti_dac_get_power(ti_dac, powerdown);
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mutex_lock(&ti_dac->lock);
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ret = ti_dac_cmd(ti_dac, power, 0);
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if (!ret)
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ti_dac->powerdown = powerdown;
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mutex_unlock(&ti_dac->lock);
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return ret ? ret : len;
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}
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static const struct iio_chan_spec_ext_info ti_dac_ext_info[] = {
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{
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.name = "powerdown",
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.read = ti_dac_read_powerdown,
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.write = ti_dac_write_powerdown,
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.shared = IIO_SHARED_BY_TYPE,
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},
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IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &ti_dac_powerdown_mode),
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IIO_ENUM_AVAILABLE("powerdown_mode", &ti_dac_powerdown_mode),
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{ },
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};
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#define TI_DAC_CHANNEL(chan) { \
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.type = IIO_VOLTAGE, \
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.channel = (chan), \
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.output = true, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.ext_info = ti_dac_ext_info, \
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}
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static const struct iio_chan_spec ti_dac_channels[] = {
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TI_DAC_CHANNEL(0),
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};
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static int ti_dac_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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*val = ti_dac->val;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = regulator_get_voltage(ti_dac->vref);
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if (ret < 0)
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return ret;
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*val = ret / 1000;
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*val2 = ti_dac->resolution;
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return IIO_VAL_FRACTIONAL_LOG2;
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}
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return -EINVAL;
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}
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static int ti_dac_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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u8 power = ti_dac_get_power(ti_dac, ti_dac->powerdown);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (ti_dac->val == val)
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return 0;
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if (val >= (1 << ti_dac->resolution) || val < 0)
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return -EINVAL;
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if (ti_dac->powerdown)
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return -EBUSY;
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mutex_lock(&ti_dac->lock);
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ret = ti_dac_cmd(ti_dac, power, val);
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if (!ret)
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ti_dac->val = val;
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mutex_unlock(&ti_dac->lock);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int ti_dac_write_raw_get_fmt(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, long mask)
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{
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return IIO_VAL_INT;
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}
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static const struct iio_info ti_dac_info = {
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.read_raw = ti_dac_read_raw,
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.write_raw = ti_dac_write_raw,
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.write_raw_get_fmt = ti_dac_write_raw_get_fmt,
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};
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static int ti_dac_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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const struct ti_dac_spec *spec;
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struct ti_dac_chip *ti_dac;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*ti_dac));
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if (!indio_dev) {
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dev_err(dev, "can not allocate iio device\n");
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return -ENOMEM;
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}
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spi->mode = SPI_MODE_1;
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spi->bits_per_word = 16;
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spi_setup(spi);
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indio_dev->dev.parent = dev;
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indio_dev->dev.of_node = spi->dev.of_node;
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indio_dev->info = &ti_dac_info;
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indio_dev->name = spi_get_device_id(spi)->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = ti_dac_channels;
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spi_set_drvdata(spi, indio_dev);
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ti_dac = iio_priv(indio_dev);
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ti_dac->powerdown = false;
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ti_dac->spi = spi;
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spec = &ti_dac_spec[spi_get_device_id(spi)->driver_data];
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indio_dev->num_channels = 1;
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ti_dac->resolution = spec->resolution;
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ti_dac->vref = devm_regulator_get(dev, "vref");
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if (IS_ERR(ti_dac->vref)) {
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dev_err(dev, "error to get regulator\n");
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return PTR_ERR(ti_dac->vref);
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}
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ret = regulator_enable(ti_dac->vref);
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if (ret < 0) {
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dev_err(dev, "can not enable regulator\n");
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return ret;
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}
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mutex_init(&ti_dac->lock);
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ret = iio_device_register(indio_dev);
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if (ret) {
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dev_err(dev, "fail to register iio device: %d\n", ret);
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goto err;
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}
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return 0;
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err:
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mutex_destroy(&ti_dac->lock);
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regulator_disable(ti_dac->vref);
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return ret;
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}
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static int ti_dac_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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struct ti_dac_chip *ti_dac = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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mutex_destroy(&ti_dac->lock);
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regulator_disable(ti_dac->vref);
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return 0;
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}
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static const struct of_device_id ti_dac_of_id[] = {
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{ .compatible = "ti,dac5311" },
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{ .compatible = "ti,dac6311" },
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{ .compatible = "ti,dac7311" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ti_dac_of_id);
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static const struct spi_device_id ti_dac_spi_id[] = {
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{ "dac5311", ID_DAC5311 },
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{ "dac6311", ID_DAC6311 },
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{ "dac7311", ID_DAC7311 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, ti_dac_spi_id);
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static struct spi_driver ti_dac_driver = {
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.driver = {
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.name = "ti-dac7311",
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.of_match_table = ti_dac_of_id,
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},
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.probe = ti_dac_probe,
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.remove = ti_dac_remove,
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.id_table = ti_dac_spi_id,
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};
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module_spi_driver(ti_dac_driver);
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MODULE_AUTHOR("Charles-Antoine Couret <charles-antoine.couret@essensium.com>");
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MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1-channel DAC driver");
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MODULE_LICENSE("GPL v2");
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