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Message-ID: <1544439813-22858-1-git-send-email-stefan.popa@analog.com>
Date: Mon, 10 Dec 2018 13:03:33 +0200
From: Stefan Popa <stefan.popa@...log.com>
To: <jic23@...nel.org>
CC: <Michael.Hennerich@...log.com>, <knaack.h@....de>,
<lars@...afoo.de>, <pmeerw@...erw.net>,
<gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
<linux-iio@...r.kernel.org>, <devel@...verdev.osuosl.org>,
<stefan.popa@...log.com>
Subject: [PATCH v4 1/2] staging: iio: ad7606: Move out of staging
Move ad7606 ADC driver out of staging and into the mainline.
Signed-off-by: Stefan Popa <stefan.popa@...log.com>
---
Changes in v2:
- Simplified the Kconfig menu.
- Added SPDX-License-Identifier.
- Ordered the includes alphabetically.
- Used a threaded interrupt.
- Replaced ad7606_poll_bh_to_ring() with ad7606_trigger_handler().
- Used a trigger.
- Replaced wait_event_interruptible() with wait_for_completion_timeout().
- Replaced wake_up_interruptible() with complete().
- Used devm_iio_triggered_buffer_setup().
- Added buffer_ops.
- Used single line comments where needed.
- Removed the gap between docs and struct.
- Added ad7606_of_match[].
Changes in v3:
- Added a comment which offers more information of the way the interrupt
is triggered.
- Fixed the way a new conversion is triggered.
- endianness = IIO_CPU
- Removed unnecessary mutex locks.
- Removed the buffer_postdisable ops and replaced it with buffer_predisable.
- Added a devm_add_action_or_reset() which deals with regulator_disable().
- Misc style fixes.
Changes in v4:
- Removed unused fields from the ad7606_state struct.
- Used the find_closest() macro when searching for the available scale
and the oversampling ratios.
MAINTAINERS | 7 +
drivers/iio/adc/Kconfig | 28 ++
drivers/iio/adc/Makefile | 3 +
drivers/iio/adc/ad7606.c | 588 +++++++++++++++++++++++++++++++++++
drivers/iio/adc/ad7606.h | 99 ++++++
drivers/iio/adc/ad7606_par.c | 105 +++++++
drivers/iio/adc/ad7606_spi.c | 82 +++++
drivers/staging/iio/adc/Kconfig | 34 --
drivers/staging/iio/adc/Makefile | 3 -
drivers/staging/iio/adc/ad7606.c | 565 ---------------------------------
drivers/staging/iio/adc/ad7606.h | 106 -------
drivers/staging/iio/adc/ad7606_par.c | 113 -------
drivers/staging/iio/adc/ad7606_spi.c | 79 -----
13 files changed, 912 insertions(+), 900 deletions(-)
create mode 100644 drivers/iio/adc/ad7606.c
create mode 100644 drivers/iio/adc/ad7606.h
create mode 100644 drivers/iio/adc/ad7606_par.c
create mode 100644 drivers/iio/adc/ad7606_spi.c
delete mode 100644 drivers/staging/iio/adc/ad7606.c
delete mode 100644 drivers/staging/iio/adc/ad7606.h
delete mode 100644 drivers/staging/iio/adc/ad7606_par.c
delete mode 100644 drivers/staging/iio/adc/ad7606_spi.c
diff --git a/MAINTAINERS b/MAINTAINERS
index f642044..843545d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -839,6 +839,13 @@ S: Supported
F: drivers/iio/dac/ad5758.c
F: Documentation/devicetree/bindings/iio/dac/ad5758.txt
+ANALOG DEVICES INC AD7606 DRIVER
+M: Stefan Popa <stefan.popa@...log.com>
+L: linux-iio@...r.kernel.org
+W: http://ez.analog.com/community/linux-device-drivers
+S: Supported
+F: drivers/iio/adc/ad7606.c
+
ANALOG DEVICES INC AD9389B DRIVER
M: Hans Verkuil <hans.verkuil@...co.com>
L: linux-media@...r.kernel.org
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a52fea8..c3f61c9 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -58,6 +58,34 @@ config AD7476
To compile this driver as a module, choose M here: the
module will be called ad7476.
+config AD7606
+ tristate
+ depends on GPIOLIB || COMPILE_TEST
+ depends on HAS_IOMEM
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+
+config AD7606_IFACE_PARALLEL
+ tristate "Analog Devices AD7606 ADC driver with parallel interface support"
+ select AD7606
+ help
+ Say yes here to build parallel interface support for Analog Devices:
+ ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7606_parallel.
+
+config AD7606_IFACE_SPI
+ tristate "Analog Devices AD7606 ADC driver with spi interface support"
+ depends on SPI
+ select AD7606
+ help
+ Say yes here to build spi interface support for Analog Devices:
+ ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7606_spi.
+
config AD7766
tristate "Analog Devices AD7766/AD7767 ADC driver"
depends on SPI_MASTER
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index a6e6a0b..b734f4f 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -8,6 +8,9 @@ obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
obj-$(CONFIG_AD7266) += ad7266.o
obj-$(CONFIG_AD7291) += ad7291.o
obj-$(CONFIG_AD7298) += ad7298.o
+obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
+obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
+obj-$(CONFIG_AD7606) += ad7606.o
obj-$(CONFIG_AD7923) += ad7923.o
obj-$(CONFIG_AD7476) += ad7476.o
obj-$(CONFIG_AD7766) += ad7766.o
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
new file mode 100644
index 0000000..fa3c8e0
--- /dev/null
+++ b/drivers/iio/adc/ad7606.c
@@ -0,0 +1,588 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD7606 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/util_macros.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#include "ad7606.h"
+
+/*
+ * Scales are computed as 5000/32768 and 10000/32768 respectively,
+ * so that when applied to the raw values they provide mV values
+ */
+static const unsigned int scale_avail[2] = {
+ 152588, 305176
+};
+
+static const unsigned int ad7606_oversampling_avail[7] = {
+ 1, 2, 4, 8, 16, 32, 64,
+};
+
+static int ad7606_reset(struct ad7606_state *st)
+{
+ if (st->gpio_reset) {
+ gpiod_set_value(st->gpio_reset, 1);
+ ndelay(100); /* t_reset >= 100ns */
+ gpiod_set_value(st->gpio_reset, 0);
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+static int ad7606_read_samples(struct ad7606_state *st)
+{
+ unsigned int num = st->chip_info->num_channels;
+ u16 *data = st->data;
+ int ret;
+
+ /*
+ * The frstdata signal is set to high while and after reading the sample
+ * of the first channel and low for all other channels. This can be used
+ * to check that the incoming data is correctly aligned. During normal
+ * operation the data should never become unaligned, but some glitch or
+ * electrostatic discharge might cause an extra read or clock cycle.
+ * Monitoring the frstdata signal allows to recover from such failure
+ * situations.
+ */
+
+ if (st->gpio_frstdata) {
+ ret = st->bops->read_block(st->dev, 1, data);
+ if (ret)
+ return ret;
+
+ if (!gpiod_get_value(st->gpio_frstdata)) {
+ ad7606_reset(st);
+ return -EIO;
+ }
+
+ data++;
+ num--;
+ }
+
+ return st->bops->read_block(st->dev, num, data);
+}
+
+static irqreturn_t ad7606_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ad7606_state *st = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&st->lock);
+
+ ret = ad7606_read_samples(st);
+ if (ret == 0)
+ iio_push_to_buffers_with_timestamp(indio_dev, st->data,
+ iio_get_time_ns(indio_dev));
+
+ iio_trigger_notify_done(indio_dev->trig);
+ /* The rising edge of the CONVST signal starts a new conversion. */
+ gpiod_set_value(st->gpio_convst, 1);
+
+ mutex_unlock(&st->lock);
+
+ return IRQ_HANDLED;
+}
+
+static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+ int ret;
+
+ gpiod_set_value(st->gpio_convst, 1);
+ ret = wait_for_completion_timeout(&st->completion,
+ msecs_to_jiffies(1000));
+ if (!ret) {
+ ret = -ETIMEDOUT;
+ goto error_ret;
+ }
+
+ ret = ad7606_read_samples(st);
+ if (ret == 0)
+ ret = st->data[ch];
+
+error_ret:
+ gpiod_set_value(st->gpio_convst, 0);
+
+ return ret;
+}
+
+static int ad7606_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ int ret;
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = ad7606_scan_direct(indio_dev, chan->address);
+ iio_device_release_direct_mode(indio_dev);
+
+ if (ret < 0)
+ return ret;
+ *val = (short)ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ *val2 = scale_avail[st->range];
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ *val = st->oversampling;
+ return IIO_VAL_INT;
+ }
+ return -EINVAL;
+}
+
+static ssize_t in_voltage_scale_available_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int i, len = 0;
+
+ for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
+ scale_avail[i]);
+
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
+
+static int ad7606_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+ int values[3], i;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ mutex_lock(&st->lock);
+ i = find_closest(val2, scale_avail, ARRAY_SIZE(scale_avail));
+ gpiod_set_value(st->gpio_range, i);
+ st->range = i;
+ mutex_unlock(&st->lock);
+
+ return 0;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ if (val2)
+ return -EINVAL;
+ i = find_closest(val, ad7606_oversampling_avail,
+ ARRAY_SIZE(ad7606_oversampling_avail));
+
+ values[0] = (i >> 0) & 1;
+ values[1] = (i >> 1) & 1;
+ values[2] = (i >> 2) & 1;
+
+ mutex_lock(&st->lock);
+ gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
+ values);
+ st->oversampling = ad7606_oversampling_avail[i];
+ mutex_unlock(&st->lock);
+
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static IIO_CONST_ATTR(oversampling_ratio_available, "1 2 4 8 16 32 64");
+
+static struct attribute *ad7606_attributes_os_and_range[] = {
+ &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
+ &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_os_and_range = {
+ .attrs = ad7606_attributes_os_and_range,
+};
+
+static struct attribute *ad7606_attributes_os[] = {
+ &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_os = {
+ .attrs = ad7606_attributes_os,
+};
+
+static struct attribute *ad7606_attributes_range[] = {
+ &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_range = {
+ .attrs = ad7606_attributes_range,
+};
+
+#define AD760X_CHANNEL(num, mask) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = num, \
+ .address = num, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
+ .info_mask_shared_by_all = mask, \
+ .scan_index = num, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .endianness = IIO_CPU, \
+ }, \
+}
+
+#define AD7605_CHANNEL(num) \
+ AD760X_CHANNEL(num, 0)
+
+#define AD7606_CHANNEL(num) \
+ AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
+
+static const struct iio_chan_spec ad7605_channels[] = {
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ AD7605_CHANNEL(0),
+ AD7605_CHANNEL(1),
+ AD7605_CHANNEL(2),
+ AD7605_CHANNEL(3),
+};
+
+static const struct iio_chan_spec ad7606_channels[] = {
+ IIO_CHAN_SOFT_TIMESTAMP(8),
+ AD7606_CHANNEL(0),
+ AD7606_CHANNEL(1),
+ AD7606_CHANNEL(2),
+ AD7606_CHANNEL(3),
+ AD7606_CHANNEL(4),
+ AD7606_CHANNEL(5),
+ AD7606_CHANNEL(6),
+ AD7606_CHANNEL(7),
+};
+
+static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
+ /* More devices added in future */
+ [ID_AD7605_4] = {
+ .channels = ad7605_channels,
+ .num_channels = 5,
+ },
+ [ID_AD7606_8] = {
+ .channels = ad7606_channels,
+ .num_channels = 9,
+ .has_oversampling = true,
+ },
+ [ID_AD7606_6] = {
+ .channels = ad7606_channels,
+ .num_channels = 7,
+ .has_oversampling = true,
+ },
+ [ID_AD7606_4] = {
+ .channels = ad7606_channels,
+ .num_channels = 5,
+ .has_oversampling = true,
+ },
+};
+
+static int ad7606_request_gpios(struct ad7606_state *st)
+{
+ struct device *dev = st->dev;
+
+ st->gpio_convst = devm_gpiod_get(dev, "adi,conversion-start",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->gpio_convst))
+ return PTR_ERR(st->gpio_convst);
+
+ st->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(st->gpio_reset))
+ return PTR_ERR(st->gpio_reset);
+
+ st->gpio_range = devm_gpiod_get_optional(dev, "adi,range",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->gpio_range))
+ return PTR_ERR(st->gpio_range);
+
+ st->gpio_standby = devm_gpiod_get_optional(dev, "standby",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(st->gpio_standby))
+ return PTR_ERR(st->gpio_standby);
+
+ st->gpio_frstdata = devm_gpiod_get_optional(dev, "adi,first-data",
+ GPIOD_IN);
+ if (IS_ERR(st->gpio_frstdata))
+ return PTR_ERR(st->gpio_frstdata);
+
+ if (!st->chip_info->has_oversampling)
+ return 0;
+
+ st->gpio_os = devm_gpiod_get_array_optional(dev,
+ "adi,oversampling-ratio",
+ GPIOD_OUT_LOW);
+ return PTR_ERR_OR_ZERO(st->gpio_os);
+}
+
+/*
+ * The BUSY signal indicates when conversions are in progress, so when a rising
+ * edge of CONVST is applied, BUSY goes logic high and transitions low at the
+ * end of the entire conversion process. The falling edge of the BUSY signal
+ * triggers this interrupt.
+ */
+static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
+{
+ struct iio_dev *indio_dev = dev_id;
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ if (iio_buffer_enabled(indio_dev)) {
+ gpiod_set_value(st->gpio_convst, 0);
+ iio_trigger_poll_chained(st->trig);
+ } else {
+ complete(&st->completion);
+ }
+
+ return IRQ_HANDLED;
+};
+
+static int ad7606_validate_trigger(struct iio_dev *indio_dev,
+ struct iio_trigger *trig)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ if (st->trig != trig)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int ad7606_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ iio_triggered_buffer_postenable(indio_dev);
+ gpiod_set_value(st->gpio_convst, 1);
+
+ return 0;
+}
+
+static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct ad7606_state *st = iio_priv(indio_dev);
+ int ret;
+
+ reinit_completion(&st->completion);
+ gpiod_set_value(st->gpio_convst, 1);
+ ret = wait_for_completion_timeout(&st->completion,
+ msecs_to_jiffies(1000));
+ gpiod_set_value(st->gpio_convst, 0);
+
+ return iio_triggered_buffer_predisable(indio_dev);
+}
+
+static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
+ .postenable = &ad7606_buffer_postenable,
+ .predisable = &ad7606_buffer_predisable,
+};
+
+static const struct iio_info ad7606_info_no_os_or_range = {
+ .read_raw = &ad7606_read_raw,
+ .validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_info ad7606_info_os_and_range = {
+ .read_raw = &ad7606_read_raw,
+ .write_raw = &ad7606_write_raw,
+ .attrs = &ad7606_attribute_group_os_and_range,
+ .validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_info ad7606_info_os = {
+ .read_raw = &ad7606_read_raw,
+ .write_raw = &ad7606_write_raw,
+ .attrs = &ad7606_attribute_group_os,
+ .validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_info ad7606_info_range = {
+ .read_raw = &ad7606_read_raw,
+ .write_raw = &ad7606_write_raw,
+ .attrs = &ad7606_attribute_group_range,
+ .validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_trigger_ops ad7606_trigger_ops = {
+ .validate_device = iio_trigger_validate_own_device,
+};
+
+static void ad7606_regulator_disable(void *data)
+{
+ struct ad7606_state *st = data;
+
+ regulator_disable(st->reg);
+}
+
+int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
+ const char *name, unsigned int id,
+ const struct ad7606_bus_ops *bops)
+{
+ struct ad7606_state *st;
+ int ret;
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+ dev_set_drvdata(dev, indio_dev);
+
+ st->dev = dev;
+ mutex_init(&st->lock);
+ st->bops = bops;
+ st->base_address = base_address;
+ st->oversampling = 1;
+
+ st->reg = devm_regulator_get(dev, "avcc");
+ if (IS_ERR(st->reg))
+ return PTR_ERR(st->reg);
+
+ ret = regulator_enable(st->reg);
+ if (ret) {
+ dev_err(dev, "Failed to enable specified AVcc supply\n");
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(dev, ad7606_regulator_disable, st);
+ if (ret)
+ return ret;
+
+ st->chip_info = &ad7606_chip_info_tbl[id];
+
+ ret = ad7606_request_gpios(st);
+ if (ret)
+ return ret;
+
+ indio_dev->dev.parent = dev;
+ if (st->gpio_os) {
+ if (st->gpio_range)
+ indio_dev->info = &ad7606_info_os_and_range;
+ else
+ indio_dev->info = &ad7606_info_os;
+ } else {
+ if (st->gpio_range)
+ indio_dev->info = &ad7606_info_range;
+ else
+ indio_dev->info = &ad7606_info_no_os_or_range;
+ }
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->name = name;
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = st->chip_info->num_channels;
+
+ ret = ad7606_reset(st);
+ if (ret)
+ dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
+
+ st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
+ indio_dev->name, indio_dev->id);
+ if (st->trig == NULL)
+ return -ENOMEM;
+
+ st->trig->ops = &ad7606_trigger_ops;
+ st->trig->dev.parent = dev;
+ iio_trigger_set_drvdata(st->trig, indio_dev);
+ ret = devm_iio_trigger_register(dev, st->trig);
+ if (ret)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(st->trig);
+
+ init_completion(&st->completion);
+
+ ret = devm_request_threaded_irq(dev, irq,
+ NULL,
+ &ad7606_interrupt,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ name, indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
+ &iio_pollfunc_store_time,
+ &ad7606_trigger_handler,
+ &ad7606_buffer_ops);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(dev, indio_dev);
+
+}
+EXPORT_SYMBOL_GPL(ad7606_probe);
+
+#ifdef CONFIG_PM_SLEEP
+
+static int ad7606_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ if (st->gpio_standby) {
+ gpiod_set_value(st->gpio_range, 1);
+ gpiod_set_value(st->gpio_standby, 0);
+ }
+
+ return 0;
+}
+
+static int ad7606_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ if (st->gpio_standby) {
+ gpiod_set_value(st->gpio_range, st->range);
+ gpiod_set_value(st->gpio_standby, 1);
+ ad7606_reset(st);
+ }
+
+ return 0;
+}
+
+SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
+EXPORT_SYMBOL_GPL(ad7606_pm_ops);
+
+#endif
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
new file mode 100644
index 0000000..40433af
--- /dev/null
+++ b/drivers/iio/adc/ad7606.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * AD7606 ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#ifndef IIO_ADC_AD7606_H_
+#define IIO_ADC_AD7606_H_
+
+/**
+ * struct ad7606_chip_info - chip specific information
+ * @channels: channel specification
+ * @num_channels: number of channels
+ * @has_oversampling: whether the device has oversampling support
+ */
+struct ad7606_chip_info {
+ const struct iio_chan_spec *channels;
+ unsigned int num_channels;
+ bool has_oversampling;
+};
+
+/**
+ * struct ad7606_state - driver instance specific data
+ * @dev pointer to kernel device
+ * @chip_info entry in the table of chips that describes this device
+ * @reg regulator info for the the power supply of the device
+ * @bops bus operations (SPI or parallel)
+ * @range voltage range selection, selects which scale to apply
+ * @oversampling oversampling selection
+ * @base_address address from where to read data in parallel operation
+ * @lock protect sensor state from concurrent accesses to GPIOs
+ * @gpio_convst GPIO descriptor for conversion start signal (CONVST)
+ * @gpio_reset GPIO descriptor for device hard-reset
+ * @gpio_range GPIO descriptor for range selection
+ * @gpio_standby GPIO descriptor for stand-by signal (STBY),
+ * controls power-down mode of device
+ * @gpio_frstdata GPIO descriptor for reading from device when data
+ * is being read on the first channel
+ * @gpio_os GPIO descriptors to control oversampling on the device
+ * @complete completion to indicate end of conversion
+ * @trig The IIO trigger associated with the device.
+ * @data buffer for reading data from the device
+ */
+struct ad7606_state {
+ struct device *dev;
+ const struct ad7606_chip_info *chip_info;
+ struct regulator *reg;
+ const struct ad7606_bus_ops *bops;
+ unsigned int range;
+ unsigned int oversampling;
+ void __iomem *base_address;
+
+ struct mutex lock; /* protect sensor state */
+ struct gpio_desc *gpio_convst;
+ struct gpio_desc *gpio_reset;
+ struct gpio_desc *gpio_range;
+ struct gpio_desc *gpio_standby;
+ struct gpio_desc *gpio_frstdata;
+ struct gpio_descs *gpio_os;
+ struct iio_trigger *trig;
+ struct completion completion;
+
+ /*
+ * DMA (thus cache coherency maintenance) requires the
+ * transfer buffers to live in their own cache lines.
+ * 8 * 16-bit samples + 64-bit timestamp
+ */
+ unsigned short data[12] ____cacheline_aligned;
+};
+
+/**
+ * struct ad7606_bus_ops - driver bus operations
+ * @read_block function pointer for reading blocks of data
+ */
+struct ad7606_bus_ops {
+ /* more methods added in future? */
+ int (*read_block)(struct device *dev, int num, void *data);
+};
+
+int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
+ const char *name, unsigned int id,
+ const struct ad7606_bus_ops *bops);
+
+enum ad7606_supported_device_ids {
+ ID_AD7605_4,
+ ID_AD7606_8,
+ ID_AD7606_6,
+ ID_AD7606_4
+};
+
+#ifdef CONFIG_PM_SLEEP
+extern const struct dev_pm_ops ad7606_pm_ops;
+#define AD7606_PM_OPS (&ad7606_pm_ops)
+#else
+#define AD7606_PM_OPS NULL
+#endif
+
+#endif /* IIO_ADC_AD7606_H_ */
diff --git a/drivers/iio/adc/ad7606_par.c b/drivers/iio/adc/ad7606_par.c
new file mode 100644
index 0000000..32c7069
--- /dev/null
+++ b/drivers/iio/adc/ad7606_par.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD7606 Parallel Interface ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <linux/iio/iio.h>
+#include "ad7606.h"
+
+static int ad7606_par16_read_block(struct device *dev,
+ int count, void *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ insw((unsigned long)st->base_address, buf, count);
+
+ return 0;
+}
+
+static const struct ad7606_bus_ops ad7606_par16_bops = {
+ .read_block = ad7606_par16_read_block,
+};
+
+static int ad7606_par8_read_block(struct device *dev,
+ int count, void *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ insb((unsigned long)st->base_address, buf, count * 2);
+
+ return 0;
+}
+
+static const struct ad7606_bus_ops ad7606_par8_bops = {
+ .read_block = ad7606_par8_read_block,
+};
+
+static int ad7606_par_probe(struct platform_device *pdev)
+{
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+ struct resource *res;
+ void __iomem *addr;
+ resource_size_t remap_size;
+ int irq;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "no irq: %d\n", irq);
+ return irq;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(addr))
+ return PTR_ERR(addr);
+
+ remap_size = resource_size(res);
+
+ return ad7606_probe(&pdev->dev, irq, addr,
+ id->name, id->driver_data,
+ remap_size > 1 ? &ad7606_par16_bops :
+ &ad7606_par8_bops);
+}
+
+static const struct platform_device_id ad7606_driver_ids[] = {
+ { .name = "ad7605-4", .driver_data = ID_AD7605_4, },
+ { .name = "ad7606-4", .driver_data = ID_AD7606_4, },
+ { .name = "ad7606-6", .driver_data = ID_AD7606_6, },
+ { .name = "ad7606-8", .driver_data = ID_AD7606_8, },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
+
+static const struct of_device_id ad7606_of_match[] = {
+ { .compatible = "adi,ad7605-4" },
+ { .compatible = "adi,ad7606-4" },
+ { .compatible = "adi,ad7606-6" },
+ { .compatible = "adi,ad7606-8" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ad7606_of_match);
+
+static struct platform_driver ad7606_driver = {
+ .probe = ad7606_par_probe,
+ .id_table = ad7606_driver_ids,
+ .driver = {
+ .name = "ad7606",
+ .pm = AD7606_PM_OPS,
+ .of_match_table = ad7606_of_match,
+ },
+};
+module_platform_driver(ad7606_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/adc/ad7606_spi.c b/drivers/iio/adc/ad7606_spi.c
new file mode 100644
index 0000000..6bb1867
--- /dev/null
+++ b/drivers/iio/adc/ad7606_spi.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD7606 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+#include <linux/err.h>
+
+#include <linux/iio/iio.h>
+#include "ad7606.h"
+
+#define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */
+
+static int ad7606_spi_read_block(struct device *dev,
+ int count, void *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ int i, ret;
+ unsigned short *data = buf;
+ __be16 *bdata = buf;
+
+ ret = spi_read(spi, buf, count * 2);
+ if (ret < 0) {
+ dev_err(&spi->dev, "SPI read error\n");
+ return ret;
+ }
+
+ for (i = 0; i < count; i++)
+ data[i] = be16_to_cpu(bdata[i]);
+
+ return 0;
+}
+
+static const struct ad7606_bus_ops ad7606_spi_bops = {
+ .read_block = ad7606_spi_read_block,
+};
+
+static int ad7606_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+
+ return ad7606_probe(&spi->dev, spi->irq, NULL,
+ id->name, id->driver_data,
+ &ad7606_spi_bops);
+}
+
+static const struct spi_device_id ad7606_id_table[] = {
+ { "ad7605-4", ID_AD7605_4 },
+ { "ad7606-4", ID_AD7606_4 },
+ { "ad7606-6", ID_AD7606_6 },
+ { "ad7606-8", ID_AD7606_8 },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad7606_id_table);
+
+static const struct of_device_id ad7606_of_match[] = {
+ { .compatible = "adi,ad7605-4" },
+ { .compatible = "adi,ad7606-4" },
+ { .compatible = "adi,ad7606-6" },
+ { .compatible = "adi,ad7606-8" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ad7606_of_match);
+
+static struct spi_driver ad7606_driver = {
+ .driver = {
+ .name = "ad7606",
+ .of_match_table = ad7606_of_match,
+ .pm = AD7606_PM_OPS,
+ },
+ .probe = ad7606_spi_probe,
+ .id_table = ad7606_id_table,
+};
+module_spi_driver(ad7606_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index 9d3062a..2c05adb 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -3,40 +3,6 @@
#
menu "Analog to digital converters"
-config AD7606
- tristate "Analog Devices AD7606 ADC driver"
- depends on GPIOLIB || COMPILE_TEST
- depends on HAS_IOMEM
- select IIO_BUFFER
- select IIO_TRIGGERED_BUFFER
- help
- Say yes here to build support for Analog Devices:
- ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
-
- To compile this driver as a module, choose M here: the
- module will be called ad7606.
-
-config AD7606_IFACE_PARALLEL
- tristate "parallel interface support"
- depends on AD7606
- help
- Say yes here to include parallel interface support on the AD7606
- ADC driver.
-
- To compile this driver as a module, choose M here: the
- module will be called ad7606_parallel.
-
-config AD7606_IFACE_SPI
- tristate "spi interface support"
- depends on AD7606
- depends on SPI
- help
- Say yes here to include parallel interface support on the AD7606
- ADC driver.
-
- To compile this driver as a module, choose M here: the
- module will be called ad7606_spi.
-
config AD7780
tristate "Analog Devices AD7780 and similar ADCs driver"
depends on SPI
diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
index ebe83c1..57a18e7 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -3,9 +3,6 @@
# Makefile for industrial I/O ADC drivers
#
-obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
-obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
-obj-$(CONFIG_AD7606) += ad7606.o
obj-$(CONFIG_AD7780) += ad7780.o
obj-$(CONFIG_AD7816) += ad7816.o
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
deleted file mode 100644
index 0b728b6..0000000
--- a/drivers/staging/iio/adc/ad7606.c
+++ /dev/null
@@ -1,565 +0,0 @@
-/*
- * AD7606 SPI ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/regulator/consumer.h>
-#include <linux/err.h>
-#include <linux/gpio/consumer.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-
-#include "ad7606.h"
-
-/*
- * Scales are computed as 5000/32768 and 10000/32768 respectively,
- * so that when applied to the raw values they provide mV values
- */
-static const unsigned int scale_avail[2][2] = {
- {0, 152588}, {0, 305176}
-};
-
-static int ad7606_reset(struct ad7606_state *st)
-{
- if (st->gpio_reset) {
- gpiod_set_value(st->gpio_reset, 1);
- ndelay(100); /* t_reset >= 100ns */
- gpiod_set_value(st->gpio_reset, 0);
- return 0;
- }
-
- return -ENODEV;
-}
-
-static int ad7606_read_samples(struct ad7606_state *st)
-{
- unsigned int num = st->chip_info->num_channels;
- u16 *data = st->data;
- int ret;
-
- /*
- * The frstdata signal is set to high while and after reading the sample
- * of the first channel and low for all other channels. This can be used
- * to check that the incoming data is correctly aligned. During normal
- * operation the data should never become unaligned, but some glitch or
- * electrostatic discharge might cause an extra read or clock cycle.
- * Monitoring the frstdata signal allows to recover from such failure
- * situations.
- */
-
- if (st->gpio_frstdata) {
- ret = st->bops->read_block(st->dev, 1, data);
- if (ret)
- return ret;
-
- if (!gpiod_get_value(st->gpio_frstdata)) {
- ad7606_reset(st);
- return -EIO;
- }
-
- data++;
- num--;
- }
-
- return st->bops->read_block(st->dev, num, data);
-}
-
-static irqreturn_t ad7606_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct ad7606_state *st = iio_priv(pf->indio_dev);
-
- gpiod_set_value(st->gpio_convst, 1);
-
- return IRQ_HANDLED;
-}
-
-/**
- * ad7606_poll_bh_to_ring() bh of trigger launched polling to ring buffer
- * @work_s: the work struct through which this was scheduled
- *
- * Currently there is no option in this driver to disable the saving of
- * timestamps within the ring.
- * I think the one copy of this at a time was to avoid problems if the
- * trigger was set far too high and the reads then locked up the computer.
- **/
-static void ad7606_poll_bh_to_ring(struct work_struct *work_s)
-{
- struct ad7606_state *st = container_of(work_s, struct ad7606_state,
- poll_work);
- struct iio_dev *indio_dev = iio_priv_to_dev(st);
- int ret;
-
- ret = ad7606_read_samples(st);
- if (ret == 0)
- iio_push_to_buffers_with_timestamp(indio_dev, st->data,
- iio_get_time_ns(indio_dev));
-
- gpiod_set_value(st->gpio_convst, 0);
- iio_trigger_notify_done(indio_dev->trig);
-}
-
-static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
-{
- struct ad7606_state *st = iio_priv(indio_dev);
- int ret;
-
- st->done = false;
- gpiod_set_value(st->gpio_convst, 1);
-
- ret = wait_event_interruptible(st->wq_data_avail, st->done);
- if (ret)
- goto error_ret;
-
- ret = ad7606_read_samples(st);
- if (ret == 0)
- ret = st->data[ch];
-
-error_ret:
- gpiod_set_value(st->gpio_convst, 0);
-
- return ret;
-}
-
-static int ad7606_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- int ret;
- struct ad7606_state *st = iio_priv(indio_dev);
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- return ret;
-
- ret = ad7606_scan_direct(indio_dev, chan->address);
- iio_device_release_direct_mode(indio_dev);
-
- if (ret < 0)
- return ret;
- *val = (short)ret;
- return IIO_VAL_INT;
- case IIO_CHAN_INFO_SCALE:
- *val = scale_avail[st->range][0];
- *val2 = scale_avail[st->range][1];
- return IIO_VAL_INT_PLUS_MICRO;
- case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
- *val = st->oversampling;
- return IIO_VAL_INT;
- }
- return -EINVAL;
-}
-
-static ssize_t in_voltage_scale_available_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- int i, len = 0;
-
- for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
- len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06u ",
- scale_avail[i][0], scale_avail[i][1]);
-
- buf[len - 1] = '\n';
-
- return len;
-}
-
-static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
-
-static int ad7606_oversampling_get_index(unsigned int val)
-{
- unsigned char supported[] = {1, 2, 4, 8, 16, 32, 64};
- int i;
-
- for (i = 0; i < ARRAY_SIZE(supported); i++)
- if (val == supported[i])
- return i;
-
- return -EINVAL;
-}
-
-static int ad7606_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
-{
- struct ad7606_state *st = iio_priv(indio_dev);
- int values[3];
- int ret, i;
-
- switch (mask) {
- case IIO_CHAN_INFO_SCALE:
- ret = -EINVAL;
- mutex_lock(&st->lock);
- for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
- if (val2 == scale_avail[i][1]) {
- gpiod_set_value(st->gpio_range, i);
- st->range = i;
-
- ret = 0;
- break;
- }
- mutex_unlock(&st->lock);
-
- return ret;
- case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
- if (val2)
- return -EINVAL;
- ret = ad7606_oversampling_get_index(val);
- if (ret < 0)
- return ret;
-
- values[0] = (ret >> 0) & 1;
- values[1] = (ret >> 1) & 1;
- values[2] = (ret >> 2) & 1;
-
- mutex_lock(&st->lock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
- st->oversampling = val;
- mutex_unlock(&st->lock);
-
- return 0;
- default:
- return -EINVAL;
- }
-}
-
-static IIO_CONST_ATTR(oversampling_ratio_available, "1 2 4 8 16 32 64");
-
-static struct attribute *ad7606_attributes_os_and_range[] = {
- &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
- &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7606_attribute_group_os_and_range = {
- .attrs = ad7606_attributes_os_and_range,
-};
-
-static struct attribute *ad7606_attributes_os[] = {
- &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7606_attribute_group_os = {
- .attrs = ad7606_attributes_os,
-};
-
-static struct attribute *ad7606_attributes_range[] = {
- &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7606_attribute_group_range = {
- .attrs = ad7606_attributes_range,
-};
-
-#define AD760X_CHANNEL(num, mask) \
- { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .channel = num, \
- .address = num, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
- .info_mask_shared_by_all = mask, \
- .scan_index = num, \
- .scan_type = { \
- .sign = 's', \
- .realbits = 16, \
- .storagebits = 16, \
- .endianness = IIO_CPU, \
- }, \
- }
-
-#define AD7605_CHANNEL(num) \
- AD760X_CHANNEL(num, 0)
-
-#define AD7606_CHANNEL(num) \
- AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
-
-static const struct iio_chan_spec ad7605_channels[] = {
- IIO_CHAN_SOFT_TIMESTAMP(4),
- AD7605_CHANNEL(0),
- AD7605_CHANNEL(1),
- AD7605_CHANNEL(2),
- AD7605_CHANNEL(3),
-};
-
-static const struct iio_chan_spec ad7606_channels[] = {
- IIO_CHAN_SOFT_TIMESTAMP(8),
- AD7606_CHANNEL(0),
- AD7606_CHANNEL(1),
- AD7606_CHANNEL(2),
- AD7606_CHANNEL(3),
- AD7606_CHANNEL(4),
- AD7606_CHANNEL(5),
- AD7606_CHANNEL(6),
- AD7606_CHANNEL(7),
-};
-
-static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
- /*
- * More devices added in future
- */
- [ID_AD7605_4] = {
- .channels = ad7605_channels,
- .num_channels = 5,
- },
- [ID_AD7606_8] = {
- .channels = ad7606_channels,
- .num_channels = 9,
- .has_oversampling = true,
- },
- [ID_AD7606_6] = {
- .channels = ad7606_channels,
- .num_channels = 7,
- .has_oversampling = true,
- },
- [ID_AD7606_4] = {
- .channels = ad7606_channels,
- .num_channels = 5,
- .has_oversampling = true,
- },
-};
-
-static int ad7606_request_gpios(struct ad7606_state *st)
-{
- struct device *dev = st->dev;
-
- st->gpio_convst = devm_gpiod_get(dev, "conversion-start",
- GPIOD_OUT_LOW);
- if (IS_ERR(st->gpio_convst))
- return PTR_ERR(st->gpio_convst);
-
- st->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
- if (IS_ERR(st->gpio_reset))
- return PTR_ERR(st->gpio_reset);
-
- st->gpio_range = devm_gpiod_get_optional(dev, "range", GPIOD_OUT_LOW);
- if (IS_ERR(st->gpio_range))
- return PTR_ERR(st->gpio_range);
-
- st->gpio_standby = devm_gpiod_get_optional(dev, "standby",
- GPIOD_OUT_HIGH);
- if (IS_ERR(st->gpio_standby))
- return PTR_ERR(st->gpio_standby);
-
- st->gpio_frstdata = devm_gpiod_get_optional(dev, "first-data",
- GPIOD_IN);
- if (IS_ERR(st->gpio_frstdata))
- return PTR_ERR(st->gpio_frstdata);
-
- if (!st->chip_info->has_oversampling)
- return 0;
-
- st->gpio_os = devm_gpiod_get_array_optional(dev, "oversampling-ratio",
- GPIOD_OUT_LOW);
- return PTR_ERR_OR_ZERO(st->gpio_os);
-}
-
-/**
- * Interrupt handler
- */
-static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
-{
- struct iio_dev *indio_dev = dev_id;
- struct ad7606_state *st = iio_priv(indio_dev);
-
- if (iio_buffer_enabled(indio_dev)) {
- schedule_work(&st->poll_work);
- } else {
- st->done = true;
- wake_up_interruptible(&st->wq_data_avail);
- }
-
- return IRQ_HANDLED;
-};
-
-static const struct iio_info ad7606_info_no_os_or_range = {
- .read_raw = &ad7606_read_raw,
-};
-
-static const struct iio_info ad7606_info_os_and_range = {
- .read_raw = &ad7606_read_raw,
- .write_raw = &ad7606_write_raw,
- .attrs = &ad7606_attribute_group_os_and_range,
-};
-
-static const struct iio_info ad7606_info_os = {
- .read_raw = &ad7606_read_raw,
- .write_raw = &ad7606_write_raw,
- .attrs = &ad7606_attribute_group_os,
-};
-
-static const struct iio_info ad7606_info_range = {
- .read_raw = &ad7606_read_raw,
- .write_raw = &ad7606_write_raw,
- .attrs = &ad7606_attribute_group_range,
-};
-
-int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
- const char *name, unsigned int id,
- const struct ad7606_bus_ops *bops)
-{
- struct ad7606_state *st;
- int ret;
- struct iio_dev *indio_dev;
-
- indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
- if (!indio_dev)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
-
- st->dev = dev;
- mutex_init(&st->lock);
- st->bops = bops;
- st->base_address = base_address;
- /* tied to logic low, analog input range is +/- 5V */
- st->range = 0;
- st->oversampling = 1;
- INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring);
-
- st->reg = devm_regulator_get(dev, "avcc");
- if (IS_ERR(st->reg))
- return PTR_ERR(st->reg);
-
- ret = regulator_enable(st->reg);
- if (ret) {
- dev_err(dev, "Failed to enable specified AVcc supply\n");
- return ret;
- }
-
- st->chip_info = &ad7606_chip_info_tbl[id];
-
- ret = ad7606_request_gpios(st);
- if (ret)
- goto error_disable_reg;
-
- indio_dev->dev.parent = dev;
- if (st->gpio_os) {
- if (st->gpio_range)
- indio_dev->info = &ad7606_info_os_and_range;
- else
- indio_dev->info = &ad7606_info_os;
- } else {
- if (st->gpio_range)
- indio_dev->info = &ad7606_info_range;
- else
- indio_dev->info = &ad7606_info_no_os_or_range;
- }
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->name = name;
- indio_dev->channels = st->chip_info->channels;
- indio_dev->num_channels = st->chip_info->num_channels;
-
- init_waitqueue_head(&st->wq_data_avail);
-
- ret = ad7606_reset(st);
- if (ret)
- dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
-
- ret = request_irq(irq, ad7606_interrupt, IRQF_TRIGGER_FALLING, name,
- indio_dev);
- if (ret)
- goto error_disable_reg;
-
- ret = iio_triggered_buffer_setup(indio_dev, &ad7606_trigger_handler,
- NULL, NULL);
- if (ret)
- goto error_free_irq;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_unregister_ring;
-
- dev_set_drvdata(dev, indio_dev);
-
- return 0;
-error_unregister_ring:
- iio_triggered_buffer_cleanup(indio_dev);
-
-error_free_irq:
- free_irq(irq, indio_dev);
-
-error_disable_reg:
- regulator_disable(st->reg);
- return ret;
-}
-EXPORT_SYMBOL_GPL(ad7606_probe);
-
-int ad7606_remove(struct device *dev, int irq)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- iio_triggered_buffer_cleanup(indio_dev);
-
- free_irq(irq, indio_dev);
- regulator_disable(st->reg);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(ad7606_remove);
-
-#ifdef CONFIG_PM_SLEEP
-
-static int ad7606_suspend(struct device *dev)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
-
- if (st->gpio_standby) {
- gpiod_set_value(st->gpio_range, 1);
- gpiod_set_value(st->gpio_standby, 0);
- }
-
- return 0;
-}
-
-static int ad7606_resume(struct device *dev)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
-
- if (st->gpio_standby) {
- gpiod_set_value(st->gpio_range, st->range);
- gpiod_set_value(st->gpio_standby, 1);
- ad7606_reset(st);
- }
-
- return 0;
-}
-
-SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
-EXPORT_SYMBOL_GPL(ad7606_pm_ops);
-
-#endif
-
-MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
-MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h
deleted file mode 100644
index 8618805..0000000
--- a/drivers/staging/iio/adc/ad7606.h
+++ /dev/null
@@ -1,106 +0,0 @@
-/*
- * AD7606 ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#ifndef IIO_ADC_AD7606_H_
-#define IIO_ADC_AD7606_H_
-
-/**
- * struct ad7606_chip_info - chip specific information
- * @channels: channel specification
- * @num_channels: number of channels
- * @has_oversampling: whether the device has oversampling support
- */
-
-struct ad7606_chip_info {
- const struct iio_chan_spec *channels;
- unsigned int num_channels;
- bool has_oversampling;
-};
-
-/**
- * struct ad7606_state - driver instance specific data
- * @dev pointer to kernel device
- * @chip_info entry in the table of chips that describes this device
- * @reg regulator info for the the power supply of the device
- * @poll_work work struct for continuously reading data from the device
- * into an IIO triggered buffer
- * @wq_data_avail wait queue struct for buffer mode
- * @bops bus operations (SPI or parallel)
- * @range voltage range selection, selects which scale to apply
- * @oversampling oversampling selection
- * @done marks whether reading data is done
- * @base_address address from where to read data in parallel operation
- * @lock protect sensor state from concurrent accesses to GPIOs
- * @gpio_convst GPIO descriptor for conversion start signal (CONVST)
- * @gpio_reset GPIO descriptor for device hard-reset
- * @gpio_range GPIO descriptor for range selection
- * @gpio_standby GPIO descriptor for stand-by signal (STBY),
- * controls power-down mode of device
- * @gpio_frstdata GPIO descriptor for reading from device when data
- * is being read on the first channel
- * @gpio_os GPIO descriptors to control oversampling on the device
- * @data buffer for reading data from the device
- */
-
-struct ad7606_state {
- struct device *dev;
- const struct ad7606_chip_info *chip_info;
- struct regulator *reg;
- struct work_struct poll_work;
- wait_queue_head_t wq_data_avail;
- const struct ad7606_bus_ops *bops;
- unsigned int range;
- unsigned int oversampling;
- bool done;
- void __iomem *base_address;
-
- struct mutex lock; /* protect sensor state */
- struct gpio_desc *gpio_convst;
- struct gpio_desc *gpio_reset;
- struct gpio_desc *gpio_range;
- struct gpio_desc *gpio_standby;
- struct gpio_desc *gpio_frstdata;
- struct gpio_descs *gpio_os;
-
- /*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
- * 8 * 16-bit samples + 64-bit timestamp
- */
- unsigned short data[12] ____cacheline_aligned;
-};
-
-/**
- * struct ad7606_bus_ops - driver bus operations
- * @read_block function pointer for reading blocks of data
- */
-struct ad7606_bus_ops {
- /* more methods added in future? */
- int (*read_block)(struct device *dev, int num, void *data);
-};
-
-int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
- const char *name, unsigned int id,
- const struct ad7606_bus_ops *bops);
-int ad7606_remove(struct device *dev, int irq);
-
-enum ad7606_supported_device_ids {
- ID_AD7605_4,
- ID_AD7606_8,
- ID_AD7606_6,
- ID_AD7606_4
-};
-
-#ifdef CONFIG_PM_SLEEP
-extern const struct dev_pm_ops ad7606_pm_ops;
-#define AD7606_PM_OPS (&ad7606_pm_ops)
-#else
-#define AD7606_PM_OPS NULL
-#endif
-
-#endif /* IIO_ADC_AD7606_H_ */
diff --git a/drivers/staging/iio/adc/ad7606_par.c b/drivers/staging/iio/adc/ad7606_par.c
deleted file mode 100644
index 8bd86e7..0000000
--- a/drivers/staging/iio/adc/ad7606_par.c
+++ /dev/null
@@ -1,113 +0,0 @@
-/*
- * AD7606 Parallel Interface ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/types.h>
-#include <linux/err.h>
-#include <linux/io.h>
-
-#include <linux/iio/iio.h>
-#include "ad7606.h"
-
-static int ad7606_par16_read_block(struct device *dev,
- int count, void *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
-
- insw((unsigned long)st->base_address, buf, count);
-
- return 0;
-}
-
-static const struct ad7606_bus_ops ad7606_par16_bops = {
- .read_block = ad7606_par16_read_block,
-};
-
-static int ad7606_par8_read_block(struct device *dev,
- int count, void *buf)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
-
- insb((unsigned long)st->base_address, buf, count * 2);
-
- return 0;
-}
-
-static const struct ad7606_bus_ops ad7606_par8_bops = {
- .read_block = ad7606_par8_read_block,
-};
-
-static int ad7606_par_probe(struct platform_device *pdev)
-{
- const struct platform_device_id *id = platform_get_device_id(pdev);
- struct resource *res;
- void __iomem *addr;
- resource_size_t remap_size;
- int irq;
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0) {
- dev_err(&pdev->dev, "no irq: %d\n", irq);
- return irq;
- }
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- addr = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(addr))
- return PTR_ERR(addr);
-
- remap_size = resource_size(res);
-
- return ad7606_probe(&pdev->dev, irq, addr,
- id->name, id->driver_data,
- remap_size > 1 ? &ad7606_par16_bops :
- &ad7606_par8_bops);
-}
-
-static int ad7606_par_remove(struct platform_device *pdev)
-{
- return ad7606_remove(&pdev->dev, platform_get_irq(pdev, 0));
-}
-
-static const struct platform_device_id ad7606_driver_ids[] = {
- {
- .name = "ad7605-4",
- .driver_data = ID_AD7605_4,
- }, {
- .name = "ad7606-8",
- .driver_data = ID_AD7606_8,
- }, {
- .name = "ad7606-6",
- .driver_data = ID_AD7606_6,
- }, {
- .name = "ad7606-4",
- .driver_data = ID_AD7606_4,
- },
- { }
-};
-
-MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
-
-static struct platform_driver ad7606_driver = {
- .probe = ad7606_par_probe,
- .remove = ad7606_par_remove,
- .id_table = ad7606_driver_ids,
- .driver = {
- .name = "ad7606",
- .pm = AD7606_PM_OPS,
- },
-};
-
-module_platform_driver(ad7606_driver);
-
-MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
-MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/adc/ad7606_spi.c b/drivers/staging/iio/adc/ad7606_spi.c
deleted file mode 100644
index b76ca5a..0000000
--- a/drivers/staging/iio/adc/ad7606_spi.c
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
- * AD7606 SPI ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/module.h>
-#include <linux/spi/spi.h>
-#include <linux/types.h>
-#include <linux/err.h>
-
-#include <linux/iio/iio.h>
-#include "ad7606.h"
-
-#define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */
-
-static int ad7606_spi_read_block(struct device *dev,
- int count, void *buf)
-{
- struct spi_device *spi = to_spi_device(dev);
- int i, ret;
- unsigned short *data = buf;
- __be16 *bdata = buf;
-
- ret = spi_read(spi, buf, count * 2);
- if (ret < 0) {
- dev_err(&spi->dev, "SPI read error\n");
- return ret;
- }
-
- for (i = 0; i < count; i++)
- data[i] = be16_to_cpu(bdata[i]);
-
- return 0;
-}
-
-static const struct ad7606_bus_ops ad7606_spi_bops = {
- .read_block = ad7606_spi_read_block,
-};
-
-static int ad7606_spi_probe(struct spi_device *spi)
-{
- const struct spi_device_id *id = spi_get_device_id(spi);
-
- return ad7606_probe(&spi->dev, spi->irq, NULL,
- id->name, id->driver_data,
- &ad7606_spi_bops);
-}
-
-static int ad7606_spi_remove(struct spi_device *spi)
-{
- return ad7606_remove(&spi->dev, spi->irq);
-}
-
-static const struct spi_device_id ad7606_id[] = {
- {"ad7605-4", ID_AD7605_4},
- {"ad7606-8", ID_AD7606_8},
- {"ad7606-6", ID_AD7606_6},
- {"ad7606-4", ID_AD7606_4},
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad7606_id);
-
-static struct spi_driver ad7606_driver = {
- .driver = {
- .name = "ad7606",
- .pm = AD7606_PM_OPS,
- },
- .probe = ad7606_spi_probe,
- .remove = ad7606_spi_remove,
- .id_table = ad7606_id,
-};
-module_spi_driver(ad7606_driver);
-
-MODULE_AUTHOR("Michael Hennerich <michael.hennerich@...log.com>");
-MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
-MODULE_LICENSE("GPL v2");
--
2.7.4
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