653 lines
14 KiB
C
653 lines
14 KiB
C
/*
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* Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392
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* multi-channel Digital to Analog Converters driver
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*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.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/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define AD5380_REG_DATA(x) (((x) << 2) | 3)
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#define AD5380_REG_OFFSET(x) (((x) << 2) | 2)
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#define AD5380_REG_GAIN(x) (((x) << 2) | 1)
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#define AD5380_REG_SF_PWR_DOWN (8 << 2)
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#define AD5380_REG_SF_PWR_UP (9 << 2)
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#define AD5380_REG_SF_CTRL (12 << 2)
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#define AD5380_CTRL_PWR_DOWN_MODE_OFFSET 13
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#define AD5380_CTRL_INT_VREF_2V5 BIT(12)
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#define AD5380_CTRL_INT_VREF_EN BIT(10)
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/**
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* struct ad5380_chip_info - chip specific information
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* @channel_template: channel specification template
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* @num_channels: number of channels
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* @int_vref: internal vref in uV
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*/
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struct ad5380_chip_info {
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struct iio_chan_spec channel_template;
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unsigned int num_channels;
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unsigned int int_vref;
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};
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/**
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* struct ad5380_state - driver instance specific data
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* @regmap: regmap instance used by the device
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* @chip_info: chip model specific constants, available modes etc
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* @vref_reg: vref supply regulator
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* @vref: actual reference voltage used in uA
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* @pwr_down: whether the chip is currently in power down mode
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*/
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struct ad5380_state {
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struct regmap *regmap;
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const struct ad5380_chip_info *chip_info;
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struct regulator *vref_reg;
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int vref;
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bool pwr_down;
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};
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enum ad5380_type {
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ID_AD5380_3,
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ID_AD5380_5,
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ID_AD5381_3,
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ID_AD5381_5,
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ID_AD5382_3,
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ID_AD5382_5,
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ID_AD5383_3,
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ID_AD5383_5,
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ID_AD5390_3,
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ID_AD5390_5,
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ID_AD5391_3,
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ID_AD5391_5,
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ID_AD5392_3,
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ID_AD5392_5,
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};
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static ssize_t ad5380_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 ad5380_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%d\n", st->pwr_down);
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}
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static ssize_t ad5380_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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struct ad5380_state *st = iio_priv(indio_dev);
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bool pwr_down;
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int ret;
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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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mutex_lock(&indio_dev->mlock);
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if (pwr_down)
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ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);
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else
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ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_UP, 0);
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st->pwr_down = pwr_down;
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mutex_unlock(&indio_dev->mlock);
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return ret ? ret : len;
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}
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static const char * const ad5380_powerdown_modes[] = {
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"100kohm_to_gnd",
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"three_state",
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};
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static int ad5380_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 ad5380_state *st = iio_priv(indio_dev);
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unsigned int mode;
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int ret;
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ret = regmap_read(st->regmap, AD5380_REG_SF_CTRL, &mode);
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if (ret)
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return ret;
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mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;
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return mode;
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}
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static int ad5380_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 ad5380_state *st = iio_priv(indio_dev);
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int ret;
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ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL,
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1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET,
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mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);
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return ret;
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}
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static const struct iio_enum ad5380_powerdown_mode_enum = {
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.items = ad5380_powerdown_modes,
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.num_items = ARRAY_SIZE(ad5380_powerdown_modes),
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.get = ad5380_get_powerdown_mode,
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.set = ad5380_set_powerdown_mode,
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};
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static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,
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long info)
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{
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switch (info) {
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case 0:
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return AD5380_REG_DATA(chan->address);
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case IIO_CHAN_INFO_CALIBBIAS:
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return AD5380_REG_OFFSET(chan->address);
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case IIO_CHAN_INFO_CALIBSCALE:
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return AD5380_REG_GAIN(chan->address);
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default:
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break;
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}
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return 0;
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}
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static int ad5380_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val, int val2, long info)
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{
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const unsigned int max_val = (1 << chan->scan_type.realbits);
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struct ad5380_state *st = iio_priv(indio_dev);
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_CALIBSCALE:
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if (val >= max_val || val < 0)
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return -EINVAL;
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return regmap_write(st->regmap,
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ad5380_info_to_reg(chan, info),
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val << chan->scan_type.shift);
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case IIO_CHAN_INFO_CALIBBIAS:
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val += (1 << chan->scan_type.realbits) / 2;
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if (val >= max_val || val < 0)
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return -EINVAL;
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return regmap_write(st->regmap,
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AD5380_REG_OFFSET(chan->address),
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val << chan->scan_type.shift);
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default:
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break;
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}
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return -EINVAL;
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}
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static int ad5380_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val, int *val2, long info)
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{
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struct ad5380_state *st = iio_priv(indio_dev);
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int ret;
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switch (info) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_CALIBSCALE:
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ret = regmap_read(st->regmap, ad5380_info_to_reg(chan, info),
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val);
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if (ret)
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return ret;
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*val >>= chan->scan_type.shift;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_CALIBBIAS:
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ret = regmap_read(st->regmap, AD5380_REG_OFFSET(chan->address),
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val);
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if (ret)
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return ret;
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*val >>= chan->scan_type.shift;
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val -= (1 << chan->scan_type.realbits) / 2;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 2 * st->vref;
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*val2 = chan->scan_type.realbits;
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return IIO_VAL_FRACTIONAL_LOG2;
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default:
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break;
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}
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return -EINVAL;
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}
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static const struct iio_info ad5380_info = {
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.read_raw = ad5380_read_raw,
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.write_raw = ad5380_write_raw,
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.driver_module = THIS_MODULE,
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};
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static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
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{
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.name = "powerdown",
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.read = ad5380_read_dac_powerdown,
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.write = ad5380_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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&ad5380_powerdown_mode_enum),
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IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
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{ },
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};
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#define AD5380_CHANNEL(_bits) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.output = 1, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_CALIBSCALE) | \
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BIT(IIO_CHAN_INFO_CALIBBIAS), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.scan_type = { \
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.sign = 'u', \
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.realbits = (_bits), \
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.storagebits = 16, \
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.shift = 14 - (_bits), \
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}, \
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.ext_info = ad5380_ext_info, \
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}
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static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {
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[ID_AD5380_3] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 40,
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.int_vref = 1250,
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},
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[ID_AD5380_5] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 40,
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.int_vref = 2500,
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},
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[ID_AD5381_3] = {
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.channel_template = AD5380_CHANNEL(12),
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.num_channels = 16,
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.int_vref = 1250,
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},
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[ID_AD5381_5] = {
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.channel_template = AD5380_CHANNEL(12),
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.num_channels = 16,
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.int_vref = 2500,
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},
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[ID_AD5382_3] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 32,
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.int_vref = 1250,
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},
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[ID_AD5382_5] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 32,
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.int_vref = 2500,
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},
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[ID_AD5383_3] = {
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.channel_template = AD5380_CHANNEL(12),
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.num_channels = 32,
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.int_vref = 1250,
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},
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[ID_AD5383_5] = {
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.channel_template = AD5380_CHANNEL(12),
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.num_channels = 32,
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.int_vref = 2500,
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},
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[ID_AD5390_3] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 16,
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.int_vref = 1250,
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},
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[ID_AD5390_5] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 16,
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.int_vref = 2500,
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},
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[ID_AD5391_3] = {
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.channel_template = AD5380_CHANNEL(12),
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.num_channels = 16,
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.int_vref = 1250,
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},
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[ID_AD5391_5] = {
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.channel_template = AD5380_CHANNEL(12),
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.num_channels = 16,
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.int_vref = 2500,
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},
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[ID_AD5392_3] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 8,
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.int_vref = 1250,
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},
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[ID_AD5392_5] = {
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.channel_template = AD5380_CHANNEL(14),
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.num_channels = 8,
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.int_vref = 2500,
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},
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};
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static int ad5380_alloc_channels(struct iio_dev *indio_dev)
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{
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struct ad5380_state *st = iio_priv(indio_dev);
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struct iio_chan_spec *channels;
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unsigned int i;
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channels = kcalloc(st->chip_info->num_channels,
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sizeof(struct iio_chan_spec), GFP_KERNEL);
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if (!channels)
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return -ENOMEM;
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for (i = 0; i < st->chip_info->num_channels; ++i) {
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channels[i] = st->chip_info->channel_template;
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channels[i].channel = i;
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channels[i].address = i;
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}
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indio_dev->channels = channels;
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return 0;
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}
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static int ad5380_probe(struct device *dev, struct regmap *regmap,
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enum ad5380_type type, const char *name)
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{
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struct iio_dev *indio_dev;
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struct ad5380_state *st;
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unsigned int ctrl = 0;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
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if (indio_dev == NULL) {
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dev_err(dev, "Failed to allocate iio device\n");
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return -ENOMEM;
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}
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st = iio_priv(indio_dev);
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dev_set_drvdata(dev, indio_dev);
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st->chip_info = &ad5380_chip_info_tbl[type];
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st->regmap = regmap;
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indio_dev->dev.parent = dev;
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indio_dev->name = name;
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indio_dev->info = &ad5380_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->num_channels = st->chip_info->num_channels;
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ret = ad5380_alloc_channels(indio_dev);
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if (ret) {
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dev_err(dev, "Failed to allocate channel spec: %d\n", ret);
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return ret;
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}
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if (st->chip_info->int_vref == 2500)
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ctrl |= AD5380_CTRL_INT_VREF_2V5;
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st->vref_reg = devm_regulator_get(dev, "vref");
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if (!IS_ERR(st->vref_reg)) {
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ret = regulator_enable(st->vref_reg);
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if (ret) {
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dev_err(dev, "Failed to enable vref regulators: %d\n",
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ret);
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goto error_free_reg;
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}
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ret = regulator_get_voltage(st->vref_reg);
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if (ret < 0)
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goto error_disable_reg;
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st->vref = ret / 1000;
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} else {
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st->vref = st->chip_info->int_vref;
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ctrl |= AD5380_CTRL_INT_VREF_EN;
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}
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ret = regmap_write(st->regmap, AD5380_REG_SF_CTRL, ctrl);
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if (ret) {
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dev_err(dev, "Failed to write to device: %d\n", 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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dev_err(dev, "Failed to register iio device: %d\n", ret);
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goto error_disable_reg;
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}
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return 0;
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error_disable_reg:
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if (!IS_ERR(st->vref_reg))
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regulator_disable(st->vref_reg);
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error_free_reg:
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kfree(indio_dev->channels);
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return ret;
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}
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static int ad5380_remove(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5380_state *st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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kfree(indio_dev->channels);
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if (!IS_ERR(st->vref_reg)) {
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regulator_disable(st->vref_reg);
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}
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return 0;
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}
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static bool ad5380_reg_false(struct device *dev, unsigned int reg)
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{
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return false;
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}
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static const struct regmap_config ad5380_regmap_config = {
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.reg_bits = 10,
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.val_bits = 14,
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.max_register = AD5380_REG_DATA(40),
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = ad5380_reg_false,
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.readable_reg = ad5380_reg_false,
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};
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#if IS_ENABLED(CONFIG_SPI_MASTER)
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static int ad5380_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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struct regmap *regmap;
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regmap = devm_regmap_init_spi(spi, &ad5380_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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return ad5380_probe(&spi->dev, regmap, id->driver_data, id->name);
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}
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static int ad5380_spi_remove(struct spi_device *spi)
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{
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return ad5380_remove(&spi->dev);
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}
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static const struct spi_device_id ad5380_spi_ids[] = {
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{ "ad5380-3", ID_AD5380_3 },
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{ "ad5380-5", ID_AD5380_5 },
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{ "ad5381-3", ID_AD5381_3 },
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{ "ad5381-5", ID_AD5381_5 },
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{ "ad5382-3", ID_AD5382_3 },
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{ "ad5382-5", ID_AD5382_5 },
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{ "ad5383-3", ID_AD5383_3 },
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{ "ad5383-5", ID_AD5383_5 },
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{ "ad5384-3", ID_AD5380_3 },
|
|
{ "ad5384-5", ID_AD5380_5 },
|
|
{ "ad5390-3", ID_AD5390_3 },
|
|
{ "ad5390-5", ID_AD5390_5 },
|
|
{ "ad5391-3", ID_AD5391_3 },
|
|
{ "ad5391-5", ID_AD5391_5 },
|
|
{ "ad5392-3", ID_AD5392_3 },
|
|
{ "ad5392-5", ID_AD5392_5 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, ad5380_spi_ids);
|
|
|
|
static struct spi_driver ad5380_spi_driver = {
|
|
.driver = {
|
|
.name = "ad5380",
|
|
},
|
|
.probe = ad5380_spi_probe,
|
|
.remove = ad5380_spi_remove,
|
|
.id_table = ad5380_spi_ids,
|
|
};
|
|
|
|
static inline int ad5380_spi_register_driver(void)
|
|
{
|
|
return spi_register_driver(&ad5380_spi_driver);
|
|
}
|
|
|
|
static inline void ad5380_spi_unregister_driver(void)
|
|
{
|
|
spi_unregister_driver(&ad5380_spi_driver);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int ad5380_spi_register_driver(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ad5380_spi_unregister_driver(void)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_I2C)
|
|
|
|
static int ad5380_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct regmap *regmap;
|
|
|
|
regmap = devm_regmap_init_i2c(i2c, &ad5380_regmap_config);
|
|
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
return ad5380_probe(&i2c->dev, regmap, id->driver_data, id->name);
|
|
}
|
|
|
|
static int ad5380_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
return ad5380_remove(&i2c->dev);
|
|
}
|
|
|
|
static const struct i2c_device_id ad5380_i2c_ids[] = {
|
|
{ "ad5380-3", ID_AD5380_3 },
|
|
{ "ad5380-5", ID_AD5380_5 },
|
|
{ "ad5381-3", ID_AD5381_3 },
|
|
{ "ad5381-5", ID_AD5381_5 },
|
|
{ "ad5382-3", ID_AD5382_3 },
|
|
{ "ad5382-5", ID_AD5382_5 },
|
|
{ "ad5383-3", ID_AD5383_3 },
|
|
{ "ad5383-5", ID_AD5383_5 },
|
|
{ "ad5384-3", ID_AD5380_3 },
|
|
{ "ad5384-5", ID_AD5380_5 },
|
|
{ "ad5390-3", ID_AD5390_3 },
|
|
{ "ad5390-5", ID_AD5390_5 },
|
|
{ "ad5391-3", ID_AD5391_3 },
|
|
{ "ad5391-5", ID_AD5391_5 },
|
|
{ "ad5392-3", ID_AD5392_3 },
|
|
{ "ad5392-5", ID_AD5392_5 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids);
|
|
|
|
static struct i2c_driver ad5380_i2c_driver = {
|
|
.driver = {
|
|
.name = "ad5380",
|
|
},
|
|
.probe = ad5380_i2c_probe,
|
|
.remove = ad5380_i2c_remove,
|
|
.id_table = ad5380_i2c_ids,
|
|
};
|
|
|
|
static inline int ad5380_i2c_register_driver(void)
|
|
{
|
|
return i2c_add_driver(&ad5380_i2c_driver);
|
|
}
|
|
|
|
static inline void ad5380_i2c_unregister_driver(void)
|
|
{
|
|
i2c_del_driver(&ad5380_i2c_driver);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int ad5380_i2c_register_driver(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void ad5380_i2c_unregister_driver(void)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
static int __init ad5380_spi_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = ad5380_spi_register_driver();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ad5380_i2c_register_driver();
|
|
if (ret) {
|
|
ad5380_spi_unregister_driver();
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
module_init(ad5380_spi_init);
|
|
|
|
static void __exit ad5380_spi_exit(void)
|
|
{
|
|
ad5380_i2c_unregister_driver();
|
|
ad5380_spi_unregister_driver();
|
|
|
|
}
|
|
module_exit(ad5380_spi_exit);
|
|
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC");
|
|
MODULE_LICENSE("GPL v2");
|