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2025cf9e19
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
340 lines
8.4 KiB
C
340 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* TI ADC108S102 SPI ADC driver
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*
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* Copyright (c) 2013-2015 Intel Corporation.
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* Copyright (c) 2017 Siemens AG
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*
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* This IIO device driver is designed to work with the following
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* analog to digital converters from Texas Instruments:
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* ADC108S102
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* ADC128S102
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* The communication with ADC chip is via the SPI bus (mode 3).
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*/
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#include <linux/acpi.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/types.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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#include <linux/spi/spi.h>
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/*
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* In case of ACPI, we use the hard-wired 5000 mV of the Galileo and IOT2000
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* boards as default for the reference pin VA. Device tree users encode that
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* via the vref-supply regulator.
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*/
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#define ADC108S102_VA_MV_ACPI_DEFAULT 5000
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/*
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* Defining the ADC resolution being 12 bits, we can use the same driver for
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* both ADC108S102 (10 bits resolution) and ADC128S102 (12 bits resolution)
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* chips. The ADC108S102 effectively returns a 12-bit result with the 2
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* least-significant bits unset.
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*/
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#define ADC108S102_BITS 12
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#define ADC108S102_MAX_CHANNELS 8
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/*
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* 16-bit SPI command format:
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* [15:14] Ignored
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* [13:11] 3-bit channel address
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* [10:0] Ignored
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*/
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#define ADC108S102_CMD(ch) ((u16)(ch) << 11)
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/*
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* 16-bit SPI response format:
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* [15:12] Zeros
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* [11:0] 12-bit ADC sample (for ADC108S102, [1:0] will always be 0).
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*/
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#define ADC108S102_RES_DATA(res) ((u16)res & GENMASK(11, 0))
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struct adc108s102_state {
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struct spi_device *spi;
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struct regulator *reg;
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u32 va_millivolt;
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/* SPI transfer used by triggered buffer handler*/
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struct spi_transfer ring_xfer;
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/* SPI transfer used by direct scan */
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struct spi_transfer scan_single_xfer;
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/* SPI message used by ring_xfer SPI transfer */
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struct spi_message ring_msg;
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/* SPI message used by scan_single_xfer SPI transfer */
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struct spi_message scan_single_msg;
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/*
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* SPI message buffers:
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* tx_buf: |C0|C1|C2|C3|C4|C5|C6|C7|XX|
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* rx_buf: |XX|R0|R1|R2|R3|R4|R5|R6|R7|tt|tt|tt|tt|
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*
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* tx_buf: 8 channel read commands, plus 1 dummy command
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* rx_buf: 1 dummy response, 8 channel responses, plus 64-bit timestamp
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*/
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__be16 rx_buf[13] ____cacheline_aligned;
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__be16 tx_buf[9] ____cacheline_aligned;
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};
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#define ADC108S102_V_CHAN(index) \
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{ \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.channel = index, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.address = index, \
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.scan_index = index, \
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.scan_type = { \
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.sign = 'u', \
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.realbits = ADC108S102_BITS, \
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.storagebits = 16, \
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.endianness = IIO_BE, \
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}, \
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}
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static const struct iio_chan_spec adc108s102_channels[] = {
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ADC108S102_V_CHAN(0),
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ADC108S102_V_CHAN(1),
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ADC108S102_V_CHAN(2),
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ADC108S102_V_CHAN(3),
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ADC108S102_V_CHAN(4),
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ADC108S102_V_CHAN(5),
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ADC108S102_V_CHAN(6),
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ADC108S102_V_CHAN(7),
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IIO_CHAN_SOFT_TIMESTAMP(8),
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};
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static int adc108s102_update_scan_mode(struct iio_dev *indio_dev,
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unsigned long const *active_scan_mask)
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{
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struct adc108s102_state *st = iio_priv(indio_dev);
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unsigned int bit, cmds;
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/*
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* Fill in the first x shorts of tx_buf with the number of channels
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* enabled for sampling by the triggered buffer.
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*/
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cmds = 0;
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for_each_set_bit(bit, active_scan_mask, ADC108S102_MAX_CHANNELS)
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st->tx_buf[cmds++] = cpu_to_be16(ADC108S102_CMD(bit));
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/* One dummy command added, to clock in the last response */
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st->tx_buf[cmds++] = 0x00;
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/* build SPI ring message */
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st->ring_xfer.tx_buf = &st->tx_buf[0];
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st->ring_xfer.rx_buf = &st->rx_buf[0];
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st->ring_xfer.len = cmds * sizeof(st->tx_buf[0]);
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spi_message_init_with_transfers(&st->ring_msg, &st->ring_xfer, 1);
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return 0;
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}
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static irqreturn_t adc108s102_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 adc108s102_state *st = iio_priv(indio_dev);
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int ret;
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ret = spi_sync(st->spi, &st->ring_msg);
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if (ret < 0)
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goto out_notify;
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/* Skip the dummy response in the first slot */
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iio_push_to_buffers_with_timestamp(indio_dev,
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(u8 *)&st->rx_buf[1],
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iio_get_time_ns(indio_dev));
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out_notify:
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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 adc108s102_scan_direct(struct adc108s102_state *st, unsigned int ch)
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{
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int ret;
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st->tx_buf[0] = cpu_to_be16(ADC108S102_CMD(ch));
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ret = spi_sync(st->spi, &st->scan_single_msg);
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if (ret)
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return ret;
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/* Skip the dummy response in the first slot */
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return be16_to_cpu(st->rx_buf[1]);
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}
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static int adc108s102_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long m)
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{
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struct adc108s102_state *st = iio_priv(indio_dev);
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int ret;
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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ret = adc108s102_scan_direct(st, chan->address);
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iio_device_release_direct_mode(indio_dev);
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if (ret < 0)
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return ret;
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*val = ADC108S102_RES_DATA(ret);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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if (chan->type != IIO_VOLTAGE)
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break;
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*val = st->va_millivolt;
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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 adc108s102_info = {
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.read_raw = &adc108s102_read_raw,
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.update_scan_mode = &adc108s102_update_scan_mode,
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};
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static int adc108s102_probe(struct spi_device *spi)
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{
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struct adc108s102_state *st;
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struct iio_dev *indio_dev;
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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)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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if (ACPI_COMPANION(&spi->dev)) {
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st->va_millivolt = ADC108S102_VA_MV_ACPI_DEFAULT;
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} else {
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st->reg = devm_regulator_get(&spi->dev, "vref");
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if (IS_ERR(st->reg))
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return PTR_ERR(st->reg);
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ret = regulator_enable(st->reg);
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if (ret < 0) {
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dev_err(&spi->dev, "Cannot enable vref regulator\n");
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return ret;
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}
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ret = regulator_get_voltage(st->reg);
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if (ret < 0) {
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dev_err(&spi->dev, "vref get voltage failed\n");
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return ret;
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}
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st->va_millivolt = ret / 1000;
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}
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spi_set_drvdata(spi, indio_dev);
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st->spi = spi;
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indio_dev->name = spi->modalias;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = adc108s102_channels;
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indio_dev->num_channels = ARRAY_SIZE(adc108s102_channels);
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indio_dev->info = &adc108s102_info;
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/* Setup default message */
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st->scan_single_xfer.tx_buf = st->tx_buf;
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st->scan_single_xfer.rx_buf = st->rx_buf;
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st->scan_single_xfer.len = 2 * sizeof(st->tx_buf[0]);
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spi_message_init_with_transfers(&st->scan_single_msg,
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&st->scan_single_xfer, 1);
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ret = iio_triggered_buffer_setup(indio_dev, NULL,
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&adc108s102_trigger_handler, NULL);
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if (ret)
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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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dev_err(&spi->dev, "Failed to register IIO device\n");
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goto error_cleanup_triggered_buffer;
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}
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return 0;
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error_cleanup_triggered_buffer:
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iio_triggered_buffer_cleanup(indio_dev);
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error_disable_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 adc108s102_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 adc108s102_state *st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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regulator_disable(st->reg);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id adc108s102_of_match[] = {
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{ .compatible = "ti,adc108s102" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adc108s102_of_match);
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#endif
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id adc108s102_acpi_ids[] = {
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{ "INT3495", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, adc108s102_acpi_ids);
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#endif
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static const struct spi_device_id adc108s102_id[] = {
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{ "adc108s102", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, adc108s102_id);
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static struct spi_driver adc108s102_driver = {
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.driver = {
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.name = "adc108s102",
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.of_match_table = of_match_ptr(adc108s102_of_match),
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.acpi_match_table = ACPI_PTR(adc108s102_acpi_ids),
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},
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.probe = adc108s102_probe,
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.remove = adc108s102_remove,
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.id_table = adc108s102_id,
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};
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module_spi_driver(adc108s102_driver);
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MODULE_AUTHOR("Bogdan Pricop <bogdan.pricop@emutex.com>");
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MODULE_DESCRIPTION("Texas Instruments ADC108S102 and ADC128S102 driver");
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MODULE_LICENSE("GPL v2");
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