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![Alexandru Ardelean](/assets/img/avatar_default.png)
These were found by doing some shell magic: ------------ for file in $(git grep -w devm_iio_device_alloc | cut -d: -f1 | sort | uniq) ; do if grep 'parent =' $file | grep -v trig | grep -vq devm_; then echo "$file -> $(grep "parent =" $file)" fi done ----------- The output is bearable [after the semantic patch is applied]. There is a mix of trigger assignments with some iio device parent assignments that are removed via this patch. JC: A few more added via inspection of all parent = statements in drivers/iio. Some of these may just have crossed with this series, others were less obvious to scripting due to some cross file / module boundary calls. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
337 lines
7 KiB
C
337 lines
7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* AD8366 and similar Gain Amplifiers
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* This driver supports the following gain amplifiers:
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* AD8366 Dual-Digital Variable Gain Amplifier (VGA)
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* ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
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* ADL5240 Digitally controlled variable gain amplifier (VGA)
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* HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
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*
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* Copyright 2012-2019 Analog Devices Inc.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/spi/spi.h>
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#include <linux/regulator/consumer.h>
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#include <linux/gpio/consumer.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/bitrev.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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enum ad8366_type {
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ID_AD8366,
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ID_ADA4961,
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ID_ADL5240,
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ID_HMC1119,
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};
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struct ad8366_info {
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int gain_min;
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int gain_max;
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};
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struct ad8366_state {
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struct spi_device *spi;
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struct regulator *reg;
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struct mutex lock; /* protect sensor state */
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struct gpio_desc *reset_gpio;
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unsigned char ch[2];
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enum ad8366_type type;
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struct ad8366_info *info;
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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*/
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unsigned char data[2] ____cacheline_aligned;
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};
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static struct ad8366_info ad8366_infos[] = {
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[ID_AD8366] = {
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.gain_min = 4500,
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.gain_max = 20500,
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},
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[ID_ADA4961] = {
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.gain_min = -6000,
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.gain_max = 15000,
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},
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[ID_ADL5240] = {
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.gain_min = -11500,
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.gain_max = 20000,
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},
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[ID_HMC1119] = {
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.gain_min = -31750,
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.gain_max = 0,
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},
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};
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static int ad8366_write(struct iio_dev *indio_dev,
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unsigned char ch_a, unsigned char ch_b)
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{
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struct ad8366_state *st = iio_priv(indio_dev);
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int ret;
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switch (st->type) {
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case ID_AD8366:
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ch_a = bitrev8(ch_a & 0x3F);
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ch_b = bitrev8(ch_b & 0x3F);
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st->data[0] = ch_b >> 4;
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st->data[1] = (ch_b << 4) | (ch_a >> 2);
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break;
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case ID_ADA4961:
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st->data[0] = ch_a & 0x1F;
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break;
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case ID_ADL5240:
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st->data[0] = (ch_a & 0x3F);
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break;
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case ID_HMC1119:
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st->data[0] = ch_a;
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break;
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}
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ret = spi_write(st->spi, st->data, indio_dev->num_channels);
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if (ret < 0)
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dev_err(&indio_dev->dev, "write failed (%d)", ret);
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return ret;
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}
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static int ad8366_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 ad8366_state *st = iio_priv(indio_dev);
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int ret;
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int code, gain = 0;
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mutex_lock(&st->lock);
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switch (m) {
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case IIO_CHAN_INFO_HARDWAREGAIN:
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code = st->ch[chan->channel];
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switch (st->type) {
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case ID_AD8366:
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gain = code * 253 + 4500;
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break;
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case ID_ADA4961:
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gain = 15000 - code * 1000;
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break;
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case ID_ADL5240:
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gain = 20000 - 31500 + code * 500;
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break;
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case ID_HMC1119:
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gain = -1 * code * 250;
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break;
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}
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/* Values in dB */
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*val = gain / 1000;
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*val2 = (gain % 1000) * 1000;
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ret = IIO_VAL_INT_PLUS_MICRO_DB;
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break;
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default:
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ret = -EINVAL;
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}
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mutex_unlock(&st->lock);
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return ret;
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};
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static int ad8366_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 ad8366_state *st = iio_priv(indio_dev);
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struct ad8366_info *inf = st->info;
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int code = 0, gain;
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int ret;
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/* Values in dB */
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if (val < 0)
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gain = (val * 1000) - (val2 / 1000);
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else
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gain = (val * 1000) + (val2 / 1000);
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if (gain > inf->gain_max || gain < inf->gain_min)
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return -EINVAL;
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switch (st->type) {
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case ID_AD8366:
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code = (gain - 4500) / 253;
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break;
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case ID_ADA4961:
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code = (15000 - gain) / 1000;
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break;
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case ID_ADL5240:
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code = ((gain - 500 - 20000) / 500) & 0x3F;
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break;
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case ID_HMC1119:
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code = (abs(gain) / 250) & 0x7F;
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break;
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}
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mutex_lock(&st->lock);
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switch (mask) {
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case IIO_CHAN_INFO_HARDWAREGAIN:
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st->ch[chan->channel] = code;
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ret = ad8366_write(indio_dev, st->ch[0], st->ch[1]);
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break;
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default:
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ret = -EINVAL;
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}
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mutex_unlock(&st->lock);
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return ret;
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}
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static int ad8366_write_raw_get_fmt(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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long mask)
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{
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switch (mask) {
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case IIO_CHAN_INFO_HARDWAREGAIN:
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return IIO_VAL_INT_PLUS_MICRO_DB;
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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 struct iio_info ad8366_info = {
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.read_raw = &ad8366_read_raw,
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.write_raw = &ad8366_write_raw,
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.write_raw_get_fmt = &ad8366_write_raw_get_fmt,
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};
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#define AD8366_CHAN(_channel) { \
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.type = IIO_VOLTAGE, \
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.output = 1, \
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.indexed = 1, \
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.channel = _channel, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_HARDWAREGAIN),\
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}
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static const struct iio_chan_spec ad8366_channels[] = {
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AD8366_CHAN(0),
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AD8366_CHAN(1),
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};
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static const struct iio_chan_spec ada4961_channels[] = {
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AD8366_CHAN(0),
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};
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static int ad8366_probe(struct spi_device *spi)
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{
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struct iio_dev *indio_dev;
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struct ad8366_state *st;
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int ret;
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
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if (indio_dev == NULL)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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st->reg = devm_regulator_get(&spi->dev, "vcc");
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if (!IS_ERR(st->reg)) {
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ret = regulator_enable(st->reg);
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if (ret)
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return ret;
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}
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spi_set_drvdata(spi, indio_dev);
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mutex_init(&st->lock);
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st->spi = spi;
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st->type = spi_get_device_id(spi)->driver_data;
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switch (st->type) {
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case ID_AD8366:
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indio_dev->channels = ad8366_channels;
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indio_dev->num_channels = ARRAY_SIZE(ad8366_channels);
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break;
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case ID_ADA4961:
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case ID_ADL5240:
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case ID_HMC1119:
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st->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(st->reset_gpio)) {
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ret = PTR_ERR(st->reset_gpio);
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goto error_disable_reg;
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}
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indio_dev->channels = ada4961_channels;
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indio_dev->num_channels = ARRAY_SIZE(ada4961_channels);
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break;
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default:
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dev_err(&spi->dev, "Invalid device ID\n");
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ret = -EINVAL;
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goto error_disable_reg;
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}
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st->info = &ad8366_infos[st->type];
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indio_dev->name = spi_get_device_id(spi)->name;
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indio_dev->info = &ad8366_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = ad8366_write(indio_dev, 0 , 0);
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if (ret < 0)
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goto error_disable_reg;
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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(st->reg))
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regulator_disable(st->reg);
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return ret;
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}
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static int ad8366_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 ad8366_state *st = iio_priv(indio_dev);
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struct regulator *reg = st->reg;
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iio_device_unregister(indio_dev);
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if (!IS_ERR(reg))
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regulator_disable(reg);
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return 0;
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}
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static const struct spi_device_id ad8366_id[] = {
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{"ad8366", ID_AD8366},
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{"ada4961", ID_ADA4961},
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{"adl5240", ID_ADL5240},
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{"hmc1119", ID_HMC1119},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad8366_id);
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static struct spi_driver ad8366_driver = {
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.driver = {
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.name = KBUILD_MODNAME,
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},
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.probe = ad8366_probe,
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.remove = ad8366_remove,
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.id_table = ad8366_id,
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};
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module_spi_driver(ad8366_driver);
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MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD8366 and similar Gain Amplifiers");
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MODULE_LICENSE("GPL v2");
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