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Date: Sat, 14 Jun 2014 15:56:30 +0200
From: Hartmut Knaack <knaack.h@....de>
To: Jonathan Cameron <jic23@...nel.org>,
Philippe Reynes <tremyfr@...oo.fr>, linux-iio@...r.kernel.org
CC: linux-kernel@...r.kernel.org, armadeus-forum@...ts.sourceforge.net,
lars@...afoo.de, devicetree@...r.kernel.org, pmeerw@...erw.net
Subject: Re: [PATCH v6] iio: add support of the max1027
Jonathan Cameron schrieb:
> On 07/06/14 14:38, Philippe Reynes wrote:
>> This driver add partial support of the
>> maxim 1027/1029/1031. Differential mode is not
>> supported.
>>
>> It was tested on armadeus apf27 board.
>>
>> Signed-off-by: Philippe Reynes <tremyfr@...oo.fr>
> Hi,
>
> There is one trivial bit inline. If no one else raises anything
> about this driver, I may well just fix that up and take this later
> today.
>
> I'd ideally like to collect reviewed-by or acked-by from the various
> people who have reviewed the driver (to make sure their hard work is
> not forgotten!) Hence I might let this sit for a little longer
>
> Jonathan
>> ---
>> .../devicetree/bindings/iio/adc/max1027-adc.txt | 22 +
>> drivers/iio/adc/Kconfig | 9 +
>> drivers/iio/adc/Makefile | 1 +
>> drivers/iio/adc/max1027.c | 522 ++++++++++++++++++++
>> 4 files changed, 554 insertions(+), 0 deletions(-)
>> create mode 100644 Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
>> create mode 100644 drivers/iio/adc/max1027.c
>>
>> Changelog:
>> v6: (thanks Peter Meerwald for the feedback)
>> - dont use index with temperature
>> - use const on scan mask
>> - use __be16 * for buffer
>> - return -EBUSY if trigger is already running
>> - replace it by interrupt in comment
>> - dont finish case with ";"
>> - use iio_push_to_buffers
>> - remove useless initialization of st->buffer
>> - remove useless obvious comment
>>
>> v5: (thanks Jonathan Cameron for the feedback)
>> - add validate_trigger
>> - add validate_device
>> - remove useless (void *) cast
>> - use allocated buffer for spi_write
>>
>> v4: (thanks Jonathan Cameron for the feedback)
>> - use iio_trigger_generic_data_rdy_poll
>>
>> v3: (thanks Hartmut Knaack, Lars-Peter Clausen and Jonathan Cameron for the feedback)
>> - move to drivers/iio/adc (was in staging)
>> - clean binding doc
>> - drop empty update_scan_mode callback
>> - add a lock around single channel read code
>> - remove useless wrappers around spi_write and spi_read
>> - fix available scan mask (a bit was missing)
>> - remove useless header
>> - some others little cleanp
>>
>> v2: (thanks Hartmut Knaack and Jonathan Cameron for the feedback)
>> - really use devm_*
>> - use demux magic
>> - use spi_read and spi_write (instead of spi_sync)
>> - use define for register (instead of hardcoded value)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt b/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
>> new file mode 100644
>> index 0000000..a8770cc
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
>> @@ -0,0 +1,22 @@
>> +* Maxim 1027/1029/1031 Analog to Digital Converter (ADC)
>> +
>> +Required properties:
>> + - compatible: Should be "maxim,max1027" or "maxim,max1029" or "maxim,max1031"
>> + - reg: SPI chip select number for the device
>> + - interrupt-parent: phandle to the parent interrupt controller
>> + see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
>> + - interrupts: IRQ line for the ADC
>> + see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
>> +
>> +Recommended properties:
>> +- spi-max-frequency: Definition as per
>> + Documentation/devicetree/bindings/spi/spi-bus.txt
>> +
>> +Example:
>> +adc@0 {
>> + compatible = "maxim,max1027";
>> + reg = <0>;
>> + interrupt-parent = <&gpio5>;
>> + interrupts = <15 IRQ_TYPE_EDGE_RISING>;
>> + spi-max-frequency = <1000000>;
>> +};
> I think we can take the view on this that it is so simple that no
> one will mind. Could in theory have gone in the trivial devices
> file but is fine on it's own.
>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
>> index 24c28e3..517f886 100644
>> --- a/drivers/iio/adc/Kconfig
>> +++ b/drivers/iio/adc/Kconfig
>> @@ -119,6 +119,15 @@ config LP8788_ADC
>> help
>> Say yes here to build support for TI LP8788 ADC.
>>
>> +config MAX1027
>> + tristate "Maxim max1027 ADC driver"
>> + depends on SPI
>> + select IIO_BUFFER
>> + select IIO_TRIGGERED_BUFFER
>> + help
>> + Say yes here to build support for Maxim SPI ADC models
>> + max1027, max1029 and max1031.
>> +
>> config MAX1363
>> tristate "Maxim max1363 ADC driver"
>> depends on I2C
>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
>> index ab346d8..daac784 100644
>> --- a/drivers/iio/adc/Makefile
>> +++ b/drivers/iio/adc/Makefile
>> @@ -14,6 +14,7 @@ obj-$(CONFIG_AD7887) += ad7887.o
>> obj-$(CONFIG_AT91_ADC) += at91_adc.o
>> obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
>> obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
>> +obj-$(CONFIG_MAX1027) += max1027.o
>> obj-$(CONFIG_MAX1363) += max1363.o
>> obj-$(CONFIG_MCP320X) += mcp320x.o
>> obj-$(CONFIG_MCP3422) += mcp3422.o
>> diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
>> new file mode 100644
>> index 0000000..92d6c7f
>> --- /dev/null
>> +++ b/drivers/iio/adc/max1027.c
>> @@ -0,0 +1,522 @@
>> + /*
>> + * iio/adc/max1027.c
>> + * Copyright (C) 2014 Philippe Reynes
>> + *
>> + * based on linux/drivers/iio/ad7923.c
>> + * Copyright 2011 Analog Devices Inc (from AD7923 Driver)
>> + * Copyright 2012 CS Systemes d'Information
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * max1027.c
>> + *
>> + * Partial support for max1027 and similar chips.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/spi/spi.h>
>> +#include <linux/delay.h>
>> +
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/buffer.h>
>> +#include <linux/iio/trigger.h>
>> +#include <linux/iio/trigger_consumer.h>
>> +#include <linux/iio/triggered_buffer.h>
>> +
>> +#define MAX1027_CONV_REG 0x80
>> +#define MAX1027_SETUP_REG 0x40
>> +#define MAX1027_AVG_REG 0x20
>> +#define MAX1027_RST_REG 0x10
>> +
>> +/* conversion register */
>> +#define MAX1027_TEMP 0x01
>> +#define MAX1027_SCAN_0_N (0x00 << 1)
>> +#define MAX1027_SCAN_N_M (0x01 << 1)
>> +#define MAX1027_SCAN_N (0x02 << 1)
>> +#define MAX1027_NOSCAN (0x03 << 1)
>> +#define MAX1027_CHAN(n) ((n) << 3)
>> +
>> +/* setup register */
>> +#define MAX1027_UNIPOLAR 0x02
>> +#define MAX1027_BIPOLAR 0x03
>> +#define MAX1027_REF_MODE0 (0x00 << 2)
>> +#define MAX1027_REF_MODE1 (0x01 << 2)
>> +#define MAX1027_REF_MODE2 (0x02 << 2)
>> +#define MAX1027_REF_MODE3 (0x03 << 2)
>> +#define MAX1027_CKS_MODE0 (0x00 << 4)
>> +#define MAX1027_CKS_MODE1 (0x01 << 4)
>> +#define MAX1027_CKS_MODE2 (0x02 << 4)
>> +#define MAX1027_CKS_MODE3 (0x03 << 4)
>> +
>> +/* averaging register */
>> +#define MAX1027_NSCAN_4 0x00
>> +#define MAX1027_NSCAN_8 0x01
>> +#define MAX1027_NSCAN_12 0x02
>> +#define MAX1027_NSCAN_16 0x03
>> +#define MAX1027_NAVG_4 (0x00 << 2)
>> +#define MAX1027_NAVG_8 (0x01 << 2)
>> +#define MAX1027_NAVG_16 (0x02 << 2)
>> +#define MAX1027_NAVG_32 (0x03 << 2)
>> +#define MAX1027_AVG_EN (0x01 << 4)
>> +
>> +enum max1027_id {
>> + max1027,
>> + max1029,
>> + max1031,
>> +};
>> +
>> +static const struct spi_device_id max1027_id[] = {
>> + {"max1027", max1027},
>> + {"max1029", max1029},
>> + {"max1031", max1031},
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(spi, max1027_id);
>> +
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id max1027_adc_dt_ids[] = {
>> + { .compatible = "maxim,max1027" },
>> + { .compatible = "maxim,max1029" },
>> + { .compatible = "maxim,max1031" },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
>> +#endif
>> +
>> +#define MAX1027_V_CHAN(index) \
>> + { \
>> + .type = IIO_VOLTAGE, \
>> + .indexed = 1, \
>> + .channel = index, \
>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
>> + .scan_index = index+1, \
>> + .scan_type = { \
>> + .sign = 'u', \
>> + .realbits = 10, \
>> + .storagebits = 16, \
>> + .shift = 2, \
>> + .endianness = IIO_BE, \
>> + }, \
>> + }
>> +
>> +#define MAX1027_T_CHAN \
>> + { \
>> + .type = IIO_TEMP, \
>> + .channel = 0, \
>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
>> + .scan_index = 0, \
>> + .scan_type = { \
>> + .sign = 'u', \
>> + .realbits = 12, \
>> + .storagebits = 16, \
>> + .endianness = IIO_BE, \
>> + }, \
>> + }
>> +
>> +static const struct iio_chan_spec max1027_channels[] = {
>> + MAX1027_T_CHAN,
>> + MAX1027_V_CHAN(0),
>> + MAX1027_V_CHAN(1),
>> + MAX1027_V_CHAN(2),
>> + MAX1027_V_CHAN(3),
>> + MAX1027_V_CHAN(4),
>> + MAX1027_V_CHAN(5),
>> + MAX1027_V_CHAN(6),
>> + MAX1027_V_CHAN(7)
>> +};
>> +
>> +static const struct iio_chan_spec max1029_channels[] = {
>> + MAX1027_T_CHAN,
>> + MAX1027_V_CHAN(0),
>> + MAX1027_V_CHAN(1),
>> + MAX1027_V_CHAN(2),
>> + MAX1027_V_CHAN(3),
>> + MAX1027_V_CHAN(4),
>> + MAX1027_V_CHAN(5),
>> + MAX1027_V_CHAN(6),
>> + MAX1027_V_CHAN(7),
>> + MAX1027_V_CHAN(8),
>> + MAX1027_V_CHAN(9),
>> + MAX1027_V_CHAN(10),
>> + MAX1027_V_CHAN(11)
>> +};
>> +
>> +static const struct iio_chan_spec max1031_channels[] = {
>> + MAX1027_T_CHAN,
>> + MAX1027_V_CHAN(0),
>> + MAX1027_V_CHAN(1),
>> + MAX1027_V_CHAN(2),
>> + MAX1027_V_CHAN(3),
>> + MAX1027_V_CHAN(4),
>> + MAX1027_V_CHAN(5),
>> + MAX1027_V_CHAN(6),
>> + MAX1027_V_CHAN(7),
>> + MAX1027_V_CHAN(8),
>> + MAX1027_V_CHAN(9),
>> + MAX1027_V_CHAN(10),
>> + MAX1027_V_CHAN(11),
>> + MAX1027_V_CHAN(12),
>> + MAX1027_V_CHAN(13),
>> + MAX1027_V_CHAN(14),
>> + MAX1027_V_CHAN(15)
>> +};
>> +
>> +static const unsigned long max1027_available_scan_masks[] = {
>> + 0x000001ff,
>> + 0x00000000,
>> +};
>> +
>> +static const unsigned long max1029_available_scan_masks[] = {
>> + 0x00001fff,
>> + 0x00000000,
>> +};
>> +
>> +static const unsigned long max1031_available_scan_masks[] = {
>> + 0x0001ffff,
>> + 0x00000000,
>> +};
>> +
>> +struct max1027_chip_info {
>> + const struct iio_chan_spec *channels;
>> + unsigned int num_channels;
>> + const unsigned long *available_scan_masks;
>> +};
>> +
>> +static const struct max1027_chip_info max1027_chip_info_tbl[] = {
>> + [max1027] = {
>> + .channels = max1027_channels,
>> + .num_channels = ARRAY_SIZE(max1027_channels),
>> + .available_scan_masks = max1027_available_scan_masks,
>> + },
>> + [max1029] = {
>> + .channels = max1029_channels,
>> + .num_channels = ARRAY_SIZE(max1029_channels),
>> + .available_scan_masks = max1029_available_scan_masks,
>> + },
>> + [max1031] = {
>> + .channels = max1031_channels,
>> + .num_channels = ARRAY_SIZE(max1031_channels),
>> + .available_scan_masks = max1031_available_scan_masks,
>> + },
>> +};
>> +
>> +struct max1027_state {
>> + struct max1027_chip_info *info;
> const
>
>> + struct spi_device *spi;
>> + struct iio_trigger *trig;
>> + __be16 *buffer;
>> + struct mutex lock;
>> +};
>> +
>> +static int max1027_read_single_value(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *chan,
>> + int *val)
>> +{
>> + int ret;
>> + struct max1027_state *st = iio_priv(indio_dev);
>> + unsigned char *reg = (unsigned char *)st->buffer;
> I'd have a slight preference for u8 as it isn't a character in anyway
> and we have a convenient type defined for 8 bit unsigned.
Full Ack!
> It is slight enough that I wouldn't ask for a respin for this...
>> +
>> + if (iio_buffer_enabled(indio_dev)) {
>> + dev_warn(&indio_dev->dev, "trigger mode already enabled");
>> + return -EBUSY;
>> + }
>> +
>> + /* Start acquisition on conversion register write */
>> + *reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;
>> + ret = spi_write(st->spi, reg, 1);
>> + if (ret < 0) {
>> + dev_err(&indio_dev->dev,
>> + "Failed to configure setup register\n");
>> + return ret;
>> + }
>> +
>> + /* Configure conversion register with the requested chan */
>> + *reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel)
>> + | MAX1027_NOSCAN | !!(chan->type == IIO_TEMP);
>> + ret = spi_write(st->spi, reg, 1);
>> + if (ret < 0) {
>> + dev_err(&indio_dev->dev,
>> + "Failed to configure conversion register\n");
>> + return ret;
>> + }
>> +
>> + /*
>> + * For an unknown reason, when we use the mode "10" (write
>> + * conversion register), the interrupt doesn't occur every time.
>> + * So we just wait 1 ms.
>> + */
>> + mdelay(1);
>> +
>> + /* Read result */
>> + ret = spi_read(st->spi, st->buffer, (chan->type == IIO_TEMP) ? 4 : 2);
>> + if (ret < 0)
>> + return ret;
>> +
>> + *val = be16_to_cpu(st->buffer[0]);
>> +
>> + return IIO_VAL_INT;
>> +}
>> +
>> +static int max1027_read_raw(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *chan,
>> + int *val, int *val2, long mask)
>> +{
>> + int ret = 0;
>> + struct max1027_state *st = iio_priv(indio_dev);
>> +
>> + mutex_lock(&st->lock);
>> +
>> + switch (mask) {
>> + case IIO_CHAN_INFO_RAW:
>> + ret = max1027_read_single_value(indio_dev, chan, val);
>> + break;
>> + case IIO_CHAN_INFO_SCALE:
>> + switch (chan->type) {
>> + case IIO_TEMP:
>> + *val = 1;
>> + *val2 = 8;
>> + ret = IIO_VAL_FRACTIONAL;
>> + break;
>> + case IIO_VOLTAGE:
>> + *val = 2500;
>> + *val2 = 10;
>> + ret = IIO_VAL_FRACTIONAL_LOG2;
>> + break;
>> + default:
>> + ret = -EINVAL;
>> + break;
>> + }
>> + break;
>> + default:
>> + ret = -EINVAL;
>> + break;
>> + }
>> +
>> + mutex_unlock(&st->lock);
>> +
>> + return ret;
>> +}
>> +
>> +static int max1027_debugfs_reg_access(struct iio_dev *indio_dev,
>> + unsigned reg, unsigned writeval,
>> + unsigned *readval)
>> +{
>> + struct max1027_state *st = iio_priv(indio_dev);
>> + unsigned char *val = (unsigned char *)st->buffer;
>> +
>> + if (readval != NULL)
>> + return -EINVAL;
>> +
>> + *val = (unsigned char)writeval;
>> + return spi_write(st->spi, val, 1);
>> +}
>> +
>> +static int max1027_validate_trigger(struct iio_dev *indio_dev,
>> + struct iio_trigger *trig)
>> +{
>> + struct max1027_state *st = iio_priv(indio_dev);
>> +
>> + if (st->trig != trig)
>> + return -EINVAL;
>> +
>> + return 0;
>> +}
>> +
>> +static int max1027_set_trigger_state(struct iio_trigger *trig, bool state)
>> +{
>> + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
>> + struct max1027_state *st = iio_priv(indio_dev);
>> + unsigned char *reg = (unsigned char *)st->buffer;
>> + int ret;
>> +
>> + if (state) {
>> + /* Start acquisition on cnvst */
>> + *reg = MAX1027_SETUP_REG|MAX1027_CKS_MODE0|MAX1027_REF_MODE2;
>> + ret = spi_write(st->spi, reg, 1);
>> + if (ret < 0)
>> + return ret;
>> +
>> + /* Scan from 0 to max */
>> + *reg = MAX1027_CONV_REG | MAX1027_CHAN(0)
>> + | MAX1027_SCAN_N_M | MAX1027_TEMP;
>> + ret = spi_write(st->spi, reg, 1);
>> + if (ret < 0)
>> + return ret;
>> + } else {
>> + /* Start acquisition on conversion register write */
>> + *reg = MAX1027_SETUP_REG|MAX1027_CKS_MODE2|MAX1027_REF_MODE2;
>> + ret = spi_write(st->spi, reg, 1);
>> + if (ret < 0)
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int max1027_validate_device(struct iio_trigger *trig,
>> + struct iio_dev *indio_dev)
>> +{
>> + struct iio_dev *indio = iio_trigger_get_drvdata(trig);
>> +
>> + if (indio != indio_dev)
>> + return -EINVAL;
>> +
>> + return 0;
>> +}
>> +
>> +static irqreturn_t max1027_trigger_handler(int irq, void *private)
>> +{
>> + struct iio_poll_func *pf = (struct iio_poll_func *)private;
>> + struct iio_dev *indio_dev = pf->indio_dev;
>> + struct max1027_state *st = iio_priv(indio_dev);
>> +
>> + pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq, private);
>> +
>> + /* fill buffer with all channel */
>> + spi_read(st->spi, st->buffer, indio_dev->masklength * 2);
>> +
>> + iio_push_to_buffers(indio_dev, st->buffer);
>> +
>> + iio_trigger_notify_done(indio_dev->trig);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static const struct iio_trigger_ops max1027_trigger_ops = {
>> + .owner = THIS_MODULE,
>> + .validate_device = &max1027_validate_device,
>> + .set_trigger_state = &max1027_set_trigger_state,
>> +};
>> +
>> +static const struct iio_info max1027_info = {
>> + .driver_module = THIS_MODULE,
>> + .read_raw = &max1027_read_raw,
>> + .validate_trigger = &max1027_validate_trigger,
>> + .debugfs_reg_access = &max1027_debugfs_reg_access,
>> +};
>> +
>> +static int max1027_probe(struct spi_device *spi)
>> +{
>> + int err;
>> + unsigned char *reg;
>> + struct iio_dev *indio_dev;
>> + struct max1027_state *st;
>> +
>> + pr_debug("%s: probe(spi = 0x%p)\n", __func__, spi);
>> +
>> + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
>> + if (indio_dev == NULL) {
>> + pr_err("can't allocate iio device\n");
>> + return -ENOMEM;
>> + }
>> +
>> + spi_set_drvdata(spi, indio_dev);
>> +
>> + st = iio_priv(indio_dev);
>> + st->spi = spi;
>> + st->info = (struct max1027_chip_info *)
>> + &max1027_chip_info_tbl[spi_get_device_id(spi)->driver_data];
> Why not make st->info const as you don't ever change anything in it that
> I can see... Also gets rid of the ugly typecast.
>
>> +
>> + mutex_init(&st->lock);
>> +
>> + indio_dev->name = spi_get_device_id(spi)->name;
>> + indio_dev->dev.parent = &spi->dev;
>> + indio_dev->info = &max1027_info;
>> + indio_dev->modes = INDIO_DIRECT_MODE;
>> + indio_dev->channels = st->info->channels;
>> + indio_dev->num_channels = st->info->num_channels;
>> + indio_dev->available_scan_masks = st->info->available_scan_masks;
>> +
>> + st->buffer = devm_kmalloc(&indio_dev->dev,
>> + indio_dev->num_channels * 2,
>> + GFP_KERNEL);
>> + if (st->buffer == NULL) {
>> + dev_err(&indio_dev->dev, "Can't allocate bufffer\n");
>> + return -ENOMEM;
>> + }
>> +
>> + err = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
>> + &max1027_trigger_handler, NULL);
>> + if (err < 0) {
>> + dev_err(&indio_dev->dev, "Failed to setup buffer\n");
>> + return err;
>> + }
>> +
>> + st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
>> + indio_dev->name);
>> + if (st->trig == NULL) {
>> + err = -ENOMEM;
>> + dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
>> + goto fail_trigger_alloc;
>> + }
>> +
>> + st->trig->ops = &max1027_trigger_ops;
>> + st->trig->dev.parent = &spi->dev;
>> + iio_trigger_set_drvdata(st->trig, indio_dev);
>> + iio_trigger_register(st->trig);
>> +
>> + err = devm_request_threaded_irq(&spi->dev, spi->irq,
>> + iio_trigger_generic_data_rdy_poll,
>> + NULL,
>> + IRQF_TRIGGER_FALLING,
>> + spi->dev.driver->name, st->trig);
>> + if (err < 0) {
>> + dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
>> + goto fail_dev_register;
>> + }
>> +
>> + /* Disable averaging */
>> + reg = (unsigned char *)st->buffer;
>> + *reg = MAX1027_AVG_REG;
>> + err = spi_write(st->spi, reg, 1);
>> + if (err < 0) {
>> + dev_err(&indio_dev->dev, "Failed to configure averaging register\n");
>> + goto fail_dev_register;
>> + }
>> +
>> + err = iio_device_register(indio_dev);
>> + if (err < 0) {
>> + dev_err(&indio_dev->dev, "Failed to register iio device\n");
>> + goto fail_dev_register;
>> + }
>> +
>> + return 0;
>> +
>> +fail_dev_register:
>> +fail_trigger_alloc:
>> + iio_triggered_buffer_cleanup(indio_dev);
>> +
>> + return err;
>> +}
>> +
>> +static int max1027_remove(struct spi_device *spi)
>> +{
>> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
>> +
>> + pr_debug("%s: remove(spi = 0x%p)\n", __func__, spi);
>> +
>> + iio_device_unregister(indio_dev);
>> + iio_triggered_buffer_cleanup(indio_dev);
>> +
>> + return 0;
>> +}
>> +
>> +static struct spi_driver max1027_driver = {
>> + .driver = {
>> + .name = "max1027",
>> + .owner = THIS_MODULE,
>> + },
>> + .probe = max1027_probe,
>> + .remove = max1027_remove,
>> + .id_table = max1027_id,
>> +};
>> +module_spi_driver(max1027_driver);
>> +
>> +MODULE_AUTHOR("Philippe Reynes <tremyfr@...oo.fr>");
>> +MODULE_DESCRIPTION("MAX1027/MAX1029/MAX1031 ADC");
>> +MODULE_LICENSE("GPL v2");
>>
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