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653 lines
14 KiB
653 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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|
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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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* @lock: lock to protect the data buffer during regmap ops |
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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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struct mutex lock; |
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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 sysfs_emit(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(&st->lock); |
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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(&st->lock); |
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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 IIO_CHAN_INFO_RAW: |
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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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}; |
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static const 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->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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mutex_init(&st->lock); |
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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 }, |
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{ "ad5384-5", ID_AD5380_5 }, |
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{ "ad5390-3", ID_AD5390_3 }, |
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{ "ad5390-5", ID_AD5390_5 }, |
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{ "ad5391-3", ID_AD5391_3 }, |
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{ "ad5391-5", ID_AD5391_5 }, |
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{ "ad5392-3", ID_AD5392_3 }, |
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{ "ad5392-5", ID_AD5392_5 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(spi, ad5380_spi_ids); |
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static struct spi_driver ad5380_spi_driver = { |
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.driver = { |
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.name = "ad5380", |
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}, |
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.probe = ad5380_spi_probe, |
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.remove = ad5380_spi_remove, |
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.id_table = ad5380_spi_ids, |
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}; |
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static inline int ad5380_spi_register_driver(void) |
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{ |
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return spi_register_driver(&ad5380_spi_driver); |
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} |
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static inline void ad5380_spi_unregister_driver(void) |
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{ |
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spi_unregister_driver(&ad5380_spi_driver); |
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} |
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#else |
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static inline int ad5380_spi_register_driver(void) |
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{ |
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return 0; |
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} |
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static inline void ad5380_spi_unregister_driver(void) |
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{ |
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} |
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#endif |
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#if IS_ENABLED(CONFIG_I2C) |
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static int ad5380_i2c_probe(struct i2c_client *i2c, |
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const struct i2c_device_id *id) |
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{ |
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struct regmap *regmap; |
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regmap = devm_regmap_init_i2c(i2c, &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(&i2c->dev, regmap, id->driver_data, id->name); |
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} |
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static int ad5380_i2c_remove(struct i2c_client *i2c) |
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{ |
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return ad5380_remove(&i2c->dev); |
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} |
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|
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static const struct i2c_device_id ad5380_i2c_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 }, |
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{ "ad5384-5", ID_AD5380_5 }, |
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{ "ad5390-3", ID_AD5390_3 }, |
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{ "ad5390-5", ID_AD5390_5 }, |
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{ "ad5391-3", ID_AD5391_3 }, |
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{ "ad5391-5", ID_AD5391_5 }, |
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{ "ad5392-3", ID_AD5392_3 }, |
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{ "ad5392-5", ID_AD5392_5 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, ad5380_i2c_ids); |
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|
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static struct i2c_driver ad5380_i2c_driver = { |
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.driver = { |
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.name = "ad5380", |
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}, |
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.probe = ad5380_i2c_probe, |
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.remove = ad5380_i2c_remove, |
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.id_table = ad5380_i2c_ids, |
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}; |
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|
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static inline int ad5380_i2c_register_driver(void) |
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{ |
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return i2c_add_driver(&ad5380_i2c_driver); |
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} |
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|
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static inline void ad5380_i2c_unregister_driver(void) |
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{ |
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i2c_del_driver(&ad5380_i2c_driver); |
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} |
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|
|
#else |
|
|
|
static inline int ad5380_i2c_register_driver(void) |
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{ |
|
return 0; |
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} |
|
|
|
static inline void ad5380_i2c_unregister_driver(void) |
|
{ |
|
} |
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|
|
#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(); |
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return ret; |
|
} |
|
|
|
return 0; |
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} |
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module_init(ad5380_spi_init); |
|
|
|
static void __exit ad5380_spi_exit(void) |
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{ |
|
ad5380_i2c_unregister_driver(); |
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ad5380_spi_unregister_driver(); |
|
|
|
} |
|
module_exit(ad5380_spi_exit); |
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|
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MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices AD5380/81/82/83/84/90/91/92 DAC"); |
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MODULE_LICENSE("GPL v2");
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