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![Alexandru Ardelean](/assets/img/avatar_default.png)
These were usually used before the conversion to devm_ functions, so that the remove hook would be able to retrieve the pointer and do cleanups on remove. When the conversion happened, they should have been removed, but were omitted. Some drivers were copied from drivers that fit the criteria described above. In any case, in order to prevent more drivers from being used as example (and have spi_set_drvdata() needlessly set), this change removes it from the IIO ADC group. Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com> Link: https://lore.kernel.org/r/20210513111035.77950-1-aardelean@deviqon.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
316 lines
7.5 KiB
C
316 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AD7766/AD7767 SPI ADC driver
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*
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* Copyright 2016 Analog Devices Inc.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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struct ad7766_chip_info {
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unsigned int decimation_factor;
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};
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enum {
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AD7766_SUPPLY_AVDD = 0,
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AD7766_SUPPLY_DVDD = 1,
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AD7766_SUPPLY_VREF = 2,
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AD7766_NUM_SUPPLIES = 3
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};
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struct ad7766 {
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const struct ad7766_chip_info *chip_info;
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struct spi_device *spi;
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struct clk *mclk;
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struct gpio_desc *pd_gpio;
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struct regulator_bulk_data reg[AD7766_NUM_SUPPLIES];
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struct iio_trigger *trig;
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struct spi_transfer xfer;
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struct spi_message msg;
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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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* Make the buffer large enough for one 24 bit sample and one 64 bit
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* aligned 64 bit timestamp.
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*/
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unsigned char data[ALIGN(3, sizeof(s64)) + sizeof(s64)]
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____cacheline_aligned;
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};
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/*
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* AD7766 and AD7767 variations are interface compatible, the main difference is
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* analog performance. Both parts will use the same ID.
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*/
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enum ad7766_device_ids {
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ID_AD7766,
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ID_AD7766_1,
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ID_AD7766_2,
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};
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static irqreturn_t ad7766_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct ad7766 *ad7766 = iio_priv(indio_dev);
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int ret;
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ret = spi_sync(ad7766->spi, &ad7766->msg);
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if (ret < 0)
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goto done;
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iio_push_to_buffers_with_timestamp(indio_dev, ad7766->data,
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pf->timestamp);
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done:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int ad7766_preenable(struct iio_dev *indio_dev)
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{
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struct ad7766 *ad7766 = iio_priv(indio_dev);
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int ret;
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ret = regulator_bulk_enable(ARRAY_SIZE(ad7766->reg), ad7766->reg);
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if (ret < 0) {
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dev_err(&ad7766->spi->dev, "Failed to enable supplies: %d\n",
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ret);
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return ret;
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}
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ret = clk_prepare_enable(ad7766->mclk);
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if (ret < 0) {
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dev_err(&ad7766->spi->dev, "Failed to enable MCLK: %d\n", ret);
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regulator_bulk_disable(ARRAY_SIZE(ad7766->reg), ad7766->reg);
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return ret;
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}
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gpiod_set_value(ad7766->pd_gpio, 0);
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return 0;
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}
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static int ad7766_postdisable(struct iio_dev *indio_dev)
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{
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struct ad7766 *ad7766 = iio_priv(indio_dev);
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gpiod_set_value(ad7766->pd_gpio, 1);
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/*
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* The PD pin is synchronous to the clock, so give it some time to
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* notice the change before we disable the clock.
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*/
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msleep(20);
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clk_disable_unprepare(ad7766->mclk);
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regulator_bulk_disable(ARRAY_SIZE(ad7766->reg), ad7766->reg);
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return 0;
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}
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static int ad7766_read_raw(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, int *val, int *val2, long info)
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{
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struct ad7766 *ad7766 = iio_priv(indio_dev);
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struct regulator *vref = ad7766->reg[AD7766_SUPPLY_VREF].consumer;
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int scale_uv;
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switch (info) {
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case IIO_CHAN_INFO_SCALE:
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scale_uv = regulator_get_voltage(vref);
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if (scale_uv < 0)
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return scale_uv;
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*val = scale_uv / 1000;
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*val2 = chan->scan_type.realbits;
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return IIO_VAL_FRACTIONAL_LOG2;
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case IIO_CHAN_INFO_SAMP_FREQ:
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*val = clk_get_rate(ad7766->mclk) /
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ad7766->chip_info->decimation_factor;
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return IIO_VAL_INT;
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}
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return -EINVAL;
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}
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static const struct iio_chan_spec ad7766_channels[] = {
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{
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.type = IIO_VOLTAGE,
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.indexed = 1,
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.scan_type = {
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.sign = 's',
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.realbits = 24,
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.storagebits = 32,
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.endianness = IIO_BE,
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},
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},
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IIO_CHAN_SOFT_TIMESTAMP(1),
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};
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static const struct ad7766_chip_info ad7766_chip_info[] = {
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[ID_AD7766] = {
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.decimation_factor = 8,
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},
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[ID_AD7766_1] = {
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.decimation_factor = 16,
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},
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[ID_AD7766_2] = {
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.decimation_factor = 32,
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},
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};
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static const struct iio_buffer_setup_ops ad7766_buffer_setup_ops = {
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.preenable = &ad7766_preenable,
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.postdisable = &ad7766_postdisable,
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};
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static const struct iio_info ad7766_info = {
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.read_raw = &ad7766_read_raw,
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};
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static irqreturn_t ad7766_irq(int irq, void *private)
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{
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iio_trigger_poll(private);
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return IRQ_HANDLED;
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}
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static int ad7766_set_trigger_state(struct iio_trigger *trig, bool enable)
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{
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struct ad7766 *ad7766 = iio_trigger_get_drvdata(trig);
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if (enable)
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enable_irq(ad7766->spi->irq);
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else
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disable_irq(ad7766->spi->irq);
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return 0;
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}
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static const struct iio_trigger_ops ad7766_trigger_ops = {
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.set_trigger_state = ad7766_set_trigger_state,
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.validate_device = iio_trigger_validate_own_device,
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};
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static int ad7766_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 iio_dev *indio_dev;
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struct ad7766 *ad7766;
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int ret;
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*ad7766));
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if (!indio_dev)
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return -ENOMEM;
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ad7766 = iio_priv(indio_dev);
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ad7766->chip_info = &ad7766_chip_info[id->driver_data];
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ad7766->mclk = devm_clk_get(&spi->dev, "mclk");
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if (IS_ERR(ad7766->mclk))
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return PTR_ERR(ad7766->mclk);
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ad7766->reg[AD7766_SUPPLY_AVDD].supply = "avdd";
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ad7766->reg[AD7766_SUPPLY_DVDD].supply = "dvdd";
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ad7766->reg[AD7766_SUPPLY_VREF].supply = "vref";
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ret = devm_regulator_bulk_get(&spi->dev, ARRAY_SIZE(ad7766->reg),
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ad7766->reg);
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if (ret)
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return ret;
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ad7766->pd_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",
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GPIOD_OUT_HIGH);
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if (IS_ERR(ad7766->pd_gpio))
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return PTR_ERR(ad7766->pd_gpio);
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indio_dev->name = spi_get_device_id(spi)->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = ad7766_channels;
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indio_dev->num_channels = ARRAY_SIZE(ad7766_channels);
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indio_dev->info = &ad7766_info;
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if (spi->irq > 0) {
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ad7766->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",
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indio_dev->name,
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iio_device_id(indio_dev));
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if (!ad7766->trig)
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return -ENOMEM;
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ad7766->trig->ops = &ad7766_trigger_ops;
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iio_trigger_set_drvdata(ad7766->trig, ad7766);
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/*
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* The device generates interrupts as long as it is powered up.
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* Some platforms might not allow the option to power it down so
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* don't enable the interrupt to avoid extra load on the system
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*/
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ret = devm_request_irq(&spi->dev, spi->irq, ad7766_irq,
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IRQF_TRIGGER_FALLING | IRQF_NO_AUTOEN,
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dev_name(&spi->dev),
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ad7766->trig);
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if (ret < 0)
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return ret;
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ret = devm_iio_trigger_register(&spi->dev, ad7766->trig);
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if (ret)
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return ret;
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}
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ad7766->spi = spi;
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/* First byte always 0 */
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ad7766->xfer.rx_buf = &ad7766->data[1];
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ad7766->xfer.len = 3;
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spi_message_init(&ad7766->msg);
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spi_message_add_tail(&ad7766->xfer, &ad7766->msg);
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ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
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&iio_pollfunc_store_time, &ad7766_trigger_handler,
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&ad7766_buffer_setup_ops);
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if (ret)
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return ret;
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return devm_iio_device_register(&spi->dev, indio_dev);
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}
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static const struct spi_device_id ad7766_id[] = {
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{"ad7766", ID_AD7766},
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{"ad7766-1", ID_AD7766_1},
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{"ad7766-2", ID_AD7766_2},
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{"ad7767", ID_AD7766},
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{"ad7767-1", ID_AD7766_1},
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{"ad7767-2", ID_AD7766_2},
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{}
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};
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MODULE_DEVICE_TABLE(spi, ad7766_id);
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static struct spi_driver ad7766_driver = {
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.driver = {
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.name = "ad7766",
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},
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.probe = ad7766_probe,
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.id_table = ad7766_id,
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};
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module_spi_driver(ad7766_driver);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("Analog Devices AD7766 and AD7767 ADCs driver support");
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MODULE_LICENSE("GPL v2");
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