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369 lines
8.5 KiB
369 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* AD5504, AD5501 High Voltage Digital to Analog Converter |
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* |
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* Copyright 2011 Analog Devices Inc. |
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*/ |
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#include <linux/interrupt.h> |
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#include <linux/fs.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/spi/spi.h> |
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#include <linux/slab.h> |
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#include <linux/sysfs.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/module.h> |
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#include <linux/bitops.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/events.h> |
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#include <linux/iio/dac/ad5504.h> |
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#define AD5504_RES_MASK GENMASK(11, 0) |
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#define AD5504_CMD_READ BIT(15) |
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#define AD5504_CMD_WRITE 0 |
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#define AD5504_ADDR(addr) ((addr) << 12) |
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/* Registers */ |
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#define AD5504_ADDR_NOOP 0 |
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#define AD5504_ADDR_DAC(x) ((x) + 1) |
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#define AD5504_ADDR_ALL_DAC 5 |
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#define AD5504_ADDR_CTRL 7 |
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/* Control Register */ |
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#define AD5504_DAC_PWR(ch) ((ch) << 2) |
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#define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6) |
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#define AD5504_DAC_PWRDN_20K 0 |
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#define AD5504_DAC_PWRDN_3STATE 1 |
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/** |
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* struct ad5504_state - driver instance specific data |
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* @spi: spi_device |
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* @reg: supply regulator |
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* @vref_mv: actual reference voltage used |
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* @pwr_down_mask: power down mask |
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* @pwr_down_mode: current power down mode |
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* @data: transfer buffer |
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*/ |
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struct ad5504_state { |
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struct spi_device *spi; |
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struct regulator *reg; |
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unsigned short vref_mv; |
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unsigned pwr_down_mask; |
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unsigned pwr_down_mode; |
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__be16 data[2] ____cacheline_aligned; |
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}; |
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/* |
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* ad5504_supported_device_ids: |
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*/ |
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enum ad5504_supported_device_ids { |
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ID_AD5504, |
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ID_AD5501, |
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}; |
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static int ad5504_spi_write(struct ad5504_state *st, u8 addr, u16 val) |
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{ |
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st->data[0] = cpu_to_be16(AD5504_CMD_WRITE | AD5504_ADDR(addr) | |
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(val & AD5504_RES_MASK)); |
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return spi_write(st->spi, &st->data[0], 2); |
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} |
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static int ad5504_spi_read(struct ad5504_state *st, u8 addr) |
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{ |
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int ret; |
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struct spi_transfer t = { |
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.tx_buf = &st->data[0], |
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.rx_buf = &st->data[1], |
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.len = 2, |
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}; |
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st->data[0] = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr)); |
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ret = spi_sync_transfer(st->spi, &t, 1); |
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if (ret < 0) |
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return ret; |
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return be16_to_cpu(st->data[1]) & AD5504_RES_MASK; |
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} |
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static int ad5504_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, |
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int *val2, |
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long m) |
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{ |
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struct ad5504_state *st = iio_priv(indio_dev); |
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int ret; |
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switch (m) { |
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case IIO_CHAN_INFO_RAW: |
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ret = ad5504_spi_read(st, chan->address); |
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if (ret < 0) |
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return ret; |
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*val = ret; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = st->vref_mv; |
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*val2 = chan->scan_type.realbits; |
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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 ad5504_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int val, |
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int val2, |
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long mask) |
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{ |
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struct ad5504_state *st = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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if (val >= (1 << chan->scan_type.realbits) || val < 0) |
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return -EINVAL; |
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return ad5504_spi_write(st, chan->address, val); |
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default: |
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return -EINVAL; |
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} |
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} |
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static const char * const ad5504_powerdown_modes[] = { |
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"20kohm_to_gnd", |
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"three_state", |
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}; |
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static int ad5504_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 ad5504_state *st = iio_priv(indio_dev); |
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return st->pwr_down_mode; |
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} |
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static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, unsigned int mode) |
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{ |
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struct ad5504_state *st = iio_priv(indio_dev); |
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st->pwr_down_mode = mode; |
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return 0; |
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} |
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static const struct iio_enum ad5504_powerdown_mode_enum = { |
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.items = ad5504_powerdown_modes, |
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.num_items = ARRAY_SIZE(ad5504_powerdown_modes), |
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.get = ad5504_get_powerdown_mode, |
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.set = ad5504_set_powerdown_mode, |
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}; |
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static ssize_t ad5504_read_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, const struct iio_chan_spec *chan, char *buf) |
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{ |
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struct ad5504_state *st = iio_priv(indio_dev); |
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return sysfs_emit(buf, "%d\n", |
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!(st->pwr_down_mask & (1 << chan->channel))); |
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} |
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static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev, |
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uintptr_t private, const struct iio_chan_spec *chan, const char *buf, |
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size_t len) |
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{ |
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bool pwr_down; |
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int ret; |
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struct ad5504_state *st = iio_priv(indio_dev); |
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ret = strtobool(buf, &pwr_down); |
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if (ret) |
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return ret; |
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if (pwr_down) |
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st->pwr_down_mask &= ~(1 << chan->channel); |
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else |
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st->pwr_down_mask |= (1 << chan->channel); |
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ret = ad5504_spi_write(st, AD5504_ADDR_CTRL, |
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AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) | |
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AD5504_DAC_PWR(st->pwr_down_mask)); |
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/* writes to the CTRL register must be followed by a NOOP */ |
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ad5504_spi_write(st, AD5504_ADDR_NOOP, 0); |
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return ret ? ret : len; |
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} |
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static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000"); |
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static IIO_CONST_ATTR(temp0_thresh_rising_en, "1"); |
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static struct attribute *ad5504_ev_attributes[] = { |
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&iio_const_attr_temp0_thresh_rising_value.dev_attr.attr, |
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&iio_const_attr_temp0_thresh_rising_en.dev_attr.attr, |
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NULL, |
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}; |
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static const struct attribute_group ad5504_ev_attribute_group = { |
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.attrs = ad5504_ev_attributes, |
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}; |
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static irqreturn_t ad5504_event_handler(int irq, void *private) |
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{ |
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iio_push_event(private, |
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IIO_UNMOD_EVENT_CODE(IIO_TEMP, |
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0, |
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IIO_EV_TYPE_THRESH, |
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IIO_EV_DIR_RISING), |
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iio_get_time_ns(private)); |
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return IRQ_HANDLED; |
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} |
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static const struct iio_info ad5504_info = { |
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.write_raw = ad5504_write_raw, |
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.read_raw = ad5504_read_raw, |
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.event_attrs = &ad5504_ev_attribute_group, |
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}; |
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static const struct iio_chan_spec_ext_info ad5504_ext_info[] = { |
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{ |
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.name = "powerdown", |
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.read = ad5504_read_dac_powerdown, |
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.write = ad5504_write_dac_powerdown, |
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.shared = IIO_SEPARATE, |
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}, |
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IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, |
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&ad5504_powerdown_mode_enum), |
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IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5504_powerdown_mode_enum), |
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{ }, |
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}; |
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#define AD5504_CHANNEL(_chan) { \ |
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.type = IIO_VOLTAGE, \ |
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.indexed = 1, \ |
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.output = 1, \ |
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.channel = (_chan), \ |
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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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.address = AD5504_ADDR_DAC(_chan), \ |
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.scan_type = { \ |
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.sign = 'u', \ |
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.realbits = 12, \ |
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.storagebits = 16, \ |
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}, \ |
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.ext_info = ad5504_ext_info, \ |
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} |
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static const struct iio_chan_spec ad5504_channels[] = { |
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AD5504_CHANNEL(0), |
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AD5504_CHANNEL(1), |
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AD5504_CHANNEL(2), |
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AD5504_CHANNEL(3), |
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}; |
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static int ad5504_probe(struct spi_device *spi) |
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{ |
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struct ad5504_platform_data *pdata = spi->dev.platform_data; |
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struct iio_dev *indio_dev; |
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struct ad5504_state *st; |
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struct regulator *reg; |
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int ret, voltage_uv = 0; |
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
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if (!indio_dev) |
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return -ENOMEM; |
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reg = devm_regulator_get(&spi->dev, "vcc"); |
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if (!IS_ERR(reg)) { |
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ret = regulator_enable(reg); |
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if (ret) |
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return ret; |
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ret = regulator_get_voltage(reg); |
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if (ret < 0) |
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goto error_disable_reg; |
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voltage_uv = ret; |
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} |
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spi_set_drvdata(spi, indio_dev); |
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st = iio_priv(indio_dev); |
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if (voltage_uv) |
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st->vref_mv = voltage_uv / 1000; |
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else if (pdata) |
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st->vref_mv = pdata->vref_mv; |
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else |
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dev_warn(&spi->dev, "reference voltage unspecified\n"); |
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st->reg = reg; |
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st->spi = spi; |
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indio_dev->name = spi_get_device_id(st->spi)->name; |
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indio_dev->info = &ad5504_info; |
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if (spi_get_device_id(st->spi)->driver_data == ID_AD5501) |
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indio_dev->num_channels = 1; |
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else |
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indio_dev->num_channels = 4; |
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indio_dev->channels = ad5504_channels; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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if (spi->irq) { |
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ret = devm_request_threaded_irq(&spi->dev, spi->irq, |
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NULL, |
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&ad5504_event_handler, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
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spi_get_device_id(st->spi)->name, |
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indio_dev); |
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if (ret) |
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goto error_disable_reg; |
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} |
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ret = iio_device_register(indio_dev); |
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if (ret) |
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goto error_disable_reg; |
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return 0; |
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error_disable_reg: |
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if (!IS_ERR(reg)) |
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regulator_disable(reg); |
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return ret; |
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} |
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static void ad5504_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 ad5504_state *st = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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if (!IS_ERR(st->reg)) |
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regulator_disable(st->reg); |
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} |
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static const struct spi_device_id ad5504_id[] = { |
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{"ad5504", ID_AD5504}, |
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{"ad5501", ID_AD5501}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(spi, ad5504_id); |
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static struct spi_driver ad5504_driver = { |
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.driver = { |
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.name = "ad5504", |
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}, |
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.probe = ad5504_probe, |
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.remove = ad5504_remove, |
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.id_table = ad5504_id, |
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}; |
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module_spi_driver(ad5504_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC"); |
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MODULE_LICENSE("GPL v2");
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