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![Lars-Peter Clausen](/assets/img/avatar_default.png)
Update DAC drivers powerdown attribute show callback to use the new sysfs_emit() function. sysfs_emit() is preferred over raw s*printf() for sysfs attributes since it knows about the sysfs buffer specifics and has some built-in sanity checks. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20210320071405.9347-5-lars@metafoo.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
371 lines
8.5 KiB
C
371 lines
8.5 KiB
C
// 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", &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 int 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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return 0;
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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 <michael.hennerich@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
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MODULE_LICENSE("GPL v2");
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