Currently the ad7606 buffer handling code resides in its own source file.
But this file contains only 4 small functions of which half are just
wrappers around other functions. Buffer support is also always enabled for
this driver, so move them over to the main source file. This reduces the
amount of boilerplate code.
Also rename the main function from ad7606_core.c to ad7606.c since there is
only a single file now.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
# Makefile for industrial I/O ADC drivers
#
-ad7606-y := ad7606_core.o ad7606_ring.o
obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
obj-$(CONFIG_AD7606) += ad7606.o
--- /dev/null
+/*
+ * 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"
+
+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 = st->range * 2;
+ *val2 = st->chip_info->channels[0].scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ *val = st->oversampling;
+ return IIO_VAL_INT;
+ }
+ return -EINVAL;
+}
+
+static ssize_t ad7606_show_range(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad7606_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%u\n", st->range);
+}
+
+static ssize_t ad7606_store_range(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad7606_state *st = iio_priv(indio_dev);
+ unsigned long lval;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &lval);
+ if (ret)
+ return ret;
+
+ if (!(lval == 5000 || lval == 10000))
+ return -EINVAL;
+
+ mutex_lock(&indio_dev->mlock);
+ gpiod_set_value(st->gpio_range, lval == 10000);
+ st->range = lval;
+ mutex_unlock(&indio_dev->mlock);
+
+ return count;
+}
+
+static IIO_DEVICE_ATTR(in_voltage_range, S_IRUGO | S_IWUSR,
+ ad7606_show_range, ad7606_store_range, 0);
+static IIO_CONST_ATTR(in_voltage_range_available, "5000 10000");
+
+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;
+
+ switch (mask) {
+ 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(&indio_dev->mlock);
+ gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
+ values);
+ st->oversampling = val;
+ mutex_unlock(&indio_dev->mlock);
+
+ 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_range.dev_attr.attr,
+ &iio_const_attr_in_voltage_range_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_range.dev_attr.attr,
+ &iio_const_attr_in_voltage_range_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_range = {
+ .attrs = ad7606_attributes_range,
+};
+
+#define AD7606_CHANNEL(num) \
+ { \
+ .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 = \
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
+ .scan_index = num, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .endianness = IIO_CPU, \
+ }, \
+ }
+
+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_AD7606_8] = {
+ .channels = ad7606_channels,
+ .num_channels = 9,
+ },
+ [ID_AD7606_6] = {
+ .channels = ad7606_channels,
+ .num_channels = 7,
+ },
+ [ID_AD7606_4] = {
+ .channels = ad7606_channels,
+ .num_channels = 5,
+ },
+};
+
+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);
+
+ st->gpio_os = devm_gpiod_get_array_optional(dev, "oversampling-ratio",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(st->gpio_os))
+ return PTR_ERR(st->gpio_os);
+
+ return 0;
+}
+
+/**
+ * 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 = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &ad7606_read_raw,
+};
+
+static const struct iio_info ad7606_info_os_and_range = {
+ .driver_module = THIS_MODULE,
+ .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 = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &ad7606_read_raw,
+ .write_raw = &ad7606_write_raw,
+ .attrs = &ad7606_attribute_group_os,
+};
+
+static const struct iio_info ad7606_info_range = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &ad7606_read_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;
+ st->bops = bops;
+ st->base_address = base_address;
+ st->range = 5000;
+ st->oversampling = 1;
+ INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring);
+
+ st->reg = devm_regulator_get(dev, "vcc");
+ if (!IS_ERR(st->reg)) {
+ ret = regulator_enable(st->reg);
+ if (ret)
+ return ret;
+ }
+
+ ret = ad7606_request_gpios(st);
+ if (ret)
+ goto error_disable_reg;
+
+ st->chip_info = &ad7606_chip_info_tbl[id];
+
+ 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:
+ if (!IS_ERR(st->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);
+ if (!IS_ERR(st->reg))
+ 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 == 10000);
+ 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 <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL v2");
const char *name, unsigned int id,
const struct ad7606_bus_ops *bops);
int ad7606_remove(struct device *dev, int irq);
-int ad7606_reset(struct ad7606_state *st);
-int ad7606_read_samples(struct ad7606_state *st);
enum ad7606_supported_device_ids {
ID_AD7606_8,
ID_AD7606_4
};
-int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev);
-void ad7606_ring_cleanup(struct iio_dev *indio_dev);
-
#ifdef CONFIG_PM_SLEEP
extern const struct dev_pm_ops ad7606_pm_ops;
#define AD7606_PM_OPS (&ad7606_pm_ops)
+++ /dev/null
-/*
- * 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 "ad7606.h"
-
-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;
-}
-
-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 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 = st->range * 2;
- *val2 = st->chip_info->channels[0].scan_type.realbits;
- return IIO_VAL_FRACTIONAL_LOG2;
- case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
- *val = st->oversampling;
- return IIO_VAL_INT;
- }
- return -EINVAL;
-}
-
-static ssize_t ad7606_show_range(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
-
- return sprintf(buf, "%u\n", st->range);
-}
-
-static ssize_t ad7606_store_range(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad7606_state *st = iio_priv(indio_dev);
- unsigned long lval;
- int ret;
-
- ret = kstrtoul(buf, 10, &lval);
- if (ret)
- return ret;
-
- if (!(lval == 5000 || lval == 10000))
- return -EINVAL;
-
- mutex_lock(&indio_dev->mlock);
- gpiod_set_value(st->gpio_range, lval == 10000);
- st->range = lval;
- mutex_unlock(&indio_dev->mlock);
-
- return count;
-}
-
-static IIO_DEVICE_ATTR(in_voltage_range, S_IRUGO | S_IWUSR,
- ad7606_show_range, ad7606_store_range, 0);
-static IIO_CONST_ATTR(in_voltage_range_available, "5000 10000");
-
-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;
-
- switch (mask) {
- 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(&indio_dev->mlock);
- gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
- values);
- st->oversampling = val;
- mutex_unlock(&indio_dev->mlock);
-
- 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_range.dev_attr.attr,
- &iio_const_attr_in_voltage_range_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_range.dev_attr.attr,
- &iio_const_attr_in_voltage_range_available.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad7606_attribute_group_range = {
- .attrs = ad7606_attributes_range,
-};
-
-#define AD7606_CHANNEL(num) \
- { \
- .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 = \
- BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
- .scan_index = num, \
- .scan_type = { \
- .sign = 's', \
- .realbits = 16, \
- .storagebits = 16, \
- .endianness = IIO_CPU, \
- }, \
- }
-
-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_AD7606_8] = {
- .channels = ad7606_channels,
- .num_channels = 9,
- },
- [ID_AD7606_6] = {
- .channels = ad7606_channels,
- .num_channels = 7,
- },
- [ID_AD7606_4] = {
- .channels = ad7606_channels,
- .num_channels = 5,
- },
-};
-
-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);
-
- st->gpio_os = devm_gpiod_get_array_optional(dev, "oversampling-ratio",
- GPIOD_OUT_LOW);
- if (IS_ERR(st->gpio_os))
- return PTR_ERR(st->gpio_os);
-
- return 0;
-}
-
-/**
- * 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 = {
- .driver_module = THIS_MODULE,
- .read_raw = &ad7606_read_raw,
-};
-
-static const struct iio_info ad7606_info_os_and_range = {
- .driver_module = THIS_MODULE,
- .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 = {
- .driver_module = THIS_MODULE,
- .read_raw = &ad7606_read_raw,
- .write_raw = &ad7606_write_raw,
- .attrs = &ad7606_attribute_group_os,
-};
-
-static const struct iio_info ad7606_info_range = {
- .driver_module = THIS_MODULE,
- .read_raw = &ad7606_read_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;
- st->bops = bops;
- st->base_address = base_address;
- st->range = 5000;
- st->oversampling = 1;
-
- st->reg = devm_regulator_get(dev, "vcc");
- if (!IS_ERR(st->reg)) {
- ret = regulator_enable(st->reg);
- if (ret)
- return ret;
- }
-
- ret = ad7606_request_gpios(st);
- if (ret)
- goto error_disable_reg;
-
- st->chip_info = &ad7606_chip_info_tbl[id];
-
- 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 = ad7606_register_ring_funcs_and_init(indio_dev);
- 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:
- ad7606_ring_cleanup(indio_dev);
-
-error_free_irq:
- free_irq(irq, indio_dev);
-
-error_disable_reg:
- if (!IS_ERR(st->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);
- ad7606_ring_cleanup(indio_dev);
-
- free_irq(irq, indio_dev);
- if (!IS_ERR(st->reg))
- 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 == 10000);
- 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 <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
-MODULE_LICENSE("GPL v2");
+++ /dev/null
-/*
- * Copyright 2011-2012 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- *
- */
-
-#include <linux/interrupt.h>
-#include <linux/gpio.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-
-#include "ad7606.h"
-
-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);
-}
-
-int ad7606_register_ring_funcs_and_init(struct iio_dev *indio_dev)
-{
- struct ad7606_state *st = iio_priv(indio_dev);
-
- INIT_WORK(&st->poll_work, &ad7606_poll_bh_to_ring);
-
- return iio_triggered_buffer_setup(indio_dev, &ad7606_trigger_handler,
- NULL, NULL);
-}
-
-void ad7606_ring_cleanup(struct iio_dev *indio_dev)
-{
- iio_triggered_buffer_cleanup(indio_dev);
-}
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff