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0001-iio-Move-IIO-Dummy-Driver-out-of-staging.patch
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0001-iio-Move-IIO-Dummy-Driver-out-of-staging.patch
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From 31f154e322c25d545b1137069e87aa950fb44fbb Mon Sep 17 00:00:00 2001
Message-Id: <31f154e322c25d545b1137069e87aa950fb44fbb.1444394358.git.cristina.opriceana@gmail.com>
From: Cristina Opriceana <cristina.opriceana@gmail.com>
Date: Fri, 9 Oct 2015 15:24:14 +0300
Subject: [PATCH] iio: Move IIO Dummy Driver out of staging
This patch moves the reference IIO dummy driver from drivers/staging/iio
into a separate folder, drivers/iio/dummy and adds the proper Kconfig
and Makefile for it.
A new config menu entry, called IIO dummy driver, has been also added
in the Industrial I/O support menu, corresponding to this driver.
Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
---
drivers/iio/Kconfig | 1 +
drivers/iio/Makefile | 1 +
drivers/iio/dummy/Kconfig | 35 ++
drivers/iio/dummy/Makefile | 10 +
drivers/iio/dummy/iio_dummy_evgen.c | 262 +++++++++
drivers/iio/dummy/iio_dummy_evgen.h | 13 +
drivers/iio/dummy/iio_simple_dummy.c | 748 ++++++++++++++++++++++++++
drivers/iio/dummy/iio_simple_dummy.h | 129 +++++
drivers/iio/dummy/iio_simple_dummy_events.c | 276 ++++++++++
drivers/staging/iio/Kconfig | 54 +-
drivers/staging/iio/Makefile | 10 +-
drivers/staging/iio/iio_dummy_evgen.c | 262 ---------
drivers/staging/iio/iio_dummy_evgen.h | 13 -
drivers/staging/iio/iio_simple_dummy.c | 748 --------------------------
drivers/staging/iio/iio_simple_dummy.h | 129 -----
drivers/staging/iio/iio_simple_dummy_events.c | 276 ----------
16 files changed, 1507 insertions(+), 1460 deletions(-)
create mode 100644 drivers/iio/dummy/Kconfig
create mode 100644 drivers/iio/dummy/Makefile
create mode 100644 drivers/iio/dummy/iio_dummy_evgen.c
create mode 100644 drivers/iio/dummy/iio_dummy_evgen.h
create mode 100644 drivers/iio/dummy/iio_simple_dummy.c
create mode 100644 drivers/iio/dummy/iio_simple_dummy.h
create mode 100644 drivers/iio/dummy/iio_simple_dummy_events.c
delete mode 100644 drivers/staging/iio/iio_dummy_evgen.c
delete mode 100644 drivers/staging/iio/iio_dummy_evgen.h
delete mode 100644 drivers/staging/iio/iio_simple_dummy.c
delete mode 100644 drivers/staging/iio/iio_simple_dummy.h
delete mode 100644 drivers/staging/iio/iio_simple_dummy_events.c
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 66792e7..6b8c77c9 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -50,6 +50,7 @@ source "drivers/iio/amplifiers/Kconfig"
source "drivers/iio/chemical/Kconfig"
source "drivers/iio/common/Kconfig"
source "drivers/iio/dac/Kconfig"
+source "drivers/iio/dummy/Kconfig"
source "drivers/iio/frequency/Kconfig"
source "drivers/iio/gyro/Kconfig"
source "drivers/iio/humidity/Kconfig"
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index aeca726..6769f2f 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -16,6 +16,7 @@ obj-y += buffer/
obj-y += chemical/
obj-y += common/
obj-y += dac/
+obj-y += dummy/
obj-y += gyro/
obj-y += frequency/
obj-y += humidity/
diff --git a/drivers/iio/dummy/Kconfig b/drivers/iio/dummy/Kconfig
new file mode 100644
index 0000000..e8676aa
--- /dev/null
+++ b/drivers/iio/dummy/Kconfig
@@ -0,0 +1,35 @@
+#
+# Industrial I/O subsystem Dummy Driver configuration
+#
+menu "IIO dummy driver"
+ depends on IIO
+
+config IIO_DUMMY_EVGEN
+ tristate
+
+config IIO_SIMPLE_DUMMY
+ tristate "An example driver with no hardware requirements"
+ help
+ Driver intended mainly as documentation for how to write
+ a driver. May also be useful for testing userspace code
+ without hardware.
+
+if IIO_SIMPLE_DUMMY
+
+config IIO_SIMPLE_DUMMY_EVENTS
+ bool "Event generation support"
+ select IIO_DUMMY_EVGEN
+ help
+ Add some dummy events to the simple dummy driver.
+
+config IIO_SIMPLE_DUMMY_BUFFER
+ bool "Buffered capture support"
+ select IIO_BUFFER
+ select IIO_TRIGGER
+ select IIO_KFIFO_BUF
+ help
+ Add buffered data capture to the simple dummy driver.
+
+endif # IIO_SIMPLE_DUMMY
+
+endmenu
diff --git a/drivers/iio/dummy/Makefile b/drivers/iio/dummy/Makefile
new file mode 100644
index 0000000..0765e93
--- /dev/null
+++ b/drivers/iio/dummy/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for the IIO Dummy Driver
+#
+
+obj-$(CONFIG_IIO_SIMPLE_DUMMY) += iio_dummy.o
+iio_dummy-y := iio_simple_dummy.o
+iio_dummy-$(CONFIG_IIO_SIMPLE_DUMMY_EVENTS) += iio_simple_dummy_events.o
+iio_dummy-$(CONFIG_IIO_SIMPLE_DUMMY_BUFFER) += iio_simple_dummy_buffer.o
+
+obj-$(CONFIG_IIO_DUMMY_EVGEN) += iio_dummy_evgen.o
diff --git a/drivers/iio/dummy/iio_dummy_evgen.c b/drivers/iio/dummy/iio_dummy_evgen.c
new file mode 100644
index 0000000..9e83f34
--- /dev/null
+++ b/drivers/iio/dummy/iio_dummy_evgen.c
@@ -0,0 +1,262 @@
+/**
+ * Copyright (c) 2011 Jonathan Cameron
+ *
+ * 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.
+ *
+ * Companion module to the iio simple dummy example driver.
+ * The purpose of this is to generate 'fake' event interrupts thus
+ * allowing that driver's code to be as close as possible to that of
+ * a normal driver talking to hardware. The approach used here
+ * is not intended to be general and just happens to work for this
+ * particular use case.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/sysfs.h>
+
+#include "iio_dummy_evgen.h"
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/irq_work.h>
+
+/* Fiddly bit of faking and irq without hardware */
+#define IIO_EVENTGEN_NO 10
+
+/**
+ * struct iio_dummy_handle_irq - helper struct to simulate interrupt generation
+ * @work: irq_work used to run handlers from hardirq context
+ * @irq: fake irq line number to trigger an interrupt
+ */
+struct iio_dummy_handle_irq {
+ struct irq_work work;
+ int irq;
+};
+
+/**
+ * struct iio_dummy_evgen - evgen state
+ * @chip: irq chip we are faking
+ * @base: base of irq range
+ * @enabled: mask of which irqs are enabled
+ * @inuse: mask of which irqs are connected
+ * @regs: irq regs we are faking
+ * @lock: protect the evgen state
+ * @handler: helper for a 'hardware-like' interrupt simulation
+ */
+struct iio_dummy_eventgen {
+ struct irq_chip chip;
+ int base;
+ bool enabled[IIO_EVENTGEN_NO];
+ bool inuse[IIO_EVENTGEN_NO];
+ struct iio_dummy_regs regs[IIO_EVENTGEN_NO];
+ struct mutex lock;
+ struct iio_dummy_handle_irq handler;
+};
+
+/* We can only ever have one instance of this 'device' */
+static struct iio_dummy_eventgen *iio_evgen;
+static const char *iio_evgen_name = "iio_dummy_evgen";
+
+static void iio_dummy_event_irqmask(struct irq_data *d)
+{
+ struct irq_chip *chip = irq_data_get_irq_chip(d);
+ struct iio_dummy_eventgen *evgen =
+ container_of(chip, struct iio_dummy_eventgen, chip);
+
+ evgen->enabled[d->irq - evgen->base] = false;
+}
+
+static void iio_dummy_event_irqunmask(struct irq_data *d)
+{
+ struct irq_chip *chip = irq_data_get_irq_chip(d);
+ struct iio_dummy_eventgen *evgen =
+ container_of(chip, struct iio_dummy_eventgen, chip);
+
+ evgen->enabled[d->irq - evgen->base] = true;
+}
+
+static void iio_dummy_work_handler(struct irq_work *work)
+{
+ struct iio_dummy_handle_irq *irq_handler;
+
+ irq_handler = container_of(work, struct iio_dummy_handle_irq, work);
+ handle_simple_irq(irq_to_desc(irq_handler->irq));
+}
+
+static int iio_dummy_evgen_create(void)
+{
+ int ret, i;
+
+ iio_evgen = kzalloc(sizeof(*iio_evgen), GFP_KERNEL);
+ if (!iio_evgen)
+ return -ENOMEM;
+
+ iio_evgen->base = irq_alloc_descs(-1, 0, IIO_EVENTGEN_NO, 0);
+ if (iio_evgen->base < 0) {
+ ret = iio_evgen->base;
+ kfree(iio_evgen);
+ return ret;
+ }
+ iio_evgen->chip.name = iio_evgen_name;
+ iio_evgen->chip.irq_mask = &iio_dummy_event_irqmask;
+ iio_evgen->chip.irq_unmask = &iio_dummy_event_irqunmask;
+ for (i = 0; i < IIO_EVENTGEN_NO; i++) {
+ irq_set_chip(iio_evgen->base + i, &iio_evgen->chip);
+ irq_set_handler(iio_evgen->base + i, &handle_simple_irq);
+ irq_modify_status(iio_evgen->base + i,
+ IRQ_NOREQUEST | IRQ_NOAUTOEN,
+ IRQ_NOPROBE);
+ }
+ init_irq_work(&iio_evgen->handler.work, iio_dummy_work_handler);
+ mutex_init(&iio_evgen->lock);
+ return 0;
+}
+
+/**
+ * iio_dummy_evgen_get_irq() - get an evgen provided irq for a device
+ *
+ * This function will give a free allocated irq to a client device.
+ * That irq can then be caused to 'fire' by using the associated sysfs file.
+ */
+int iio_dummy_evgen_get_irq(void)
+{
+ int i, ret = 0;
+
+ if (!iio_evgen)
+ return -ENODEV;
+
+ mutex_lock(&iio_evgen->lock);
+ for (i = 0; i < IIO_EVENTGEN_NO; i++)
+ if (!iio_evgen->inuse[i]) {
+ ret = iio_evgen->base + i;
+ iio_evgen->inuse[i] = true;
+ break;
+ }
+ mutex_unlock(&iio_evgen->lock);
+ if (i == IIO_EVENTGEN_NO)
+ return -ENOMEM;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_dummy_evgen_get_irq);
+
+/**
+ * iio_dummy_evgen_release_irq() - give the irq back.
+ * @irq: irq being returned to the pool
+ *
+ * Used by client driver instances to give the irqs back when they disconnect
+ */
+void iio_dummy_evgen_release_irq(int irq)
+{
+ mutex_lock(&iio_evgen->lock);
+ iio_evgen->inuse[irq - iio_evgen->base] = false;
+ mutex_unlock(&iio_evgen->lock);
+}
+EXPORT_SYMBOL_GPL(iio_dummy_evgen_release_irq);
+
+struct iio_dummy_regs *iio_dummy_evgen_get_regs(int irq)
+{
+ return &iio_evgen->regs[irq - iio_evgen->base];
+}
+EXPORT_SYMBOL_GPL(iio_dummy_evgen_get_regs);
+
+static void iio_dummy_evgen_free(void)
+{
+ irq_free_descs(iio_evgen->base, IIO_EVENTGEN_NO);
+ kfree(iio_evgen);
+}
+
+static void iio_evgen_release(struct device *dev)
+{
+ iio_dummy_evgen_free();
+}
+
+static ssize_t iio_evgen_poke(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ unsigned long event;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &event);
+ if (ret)
+ return ret;
+
+ iio_evgen->regs[this_attr->address].reg_id = this_attr->address;
+ iio_evgen->regs[this_attr->address].reg_data = event;
+
+ iio_evgen->handler.irq = iio_evgen->base + this_attr->address;
+ if (iio_evgen->enabled[this_attr->address])
+ irq_work_queue(&iio_evgen->handler.work);
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR(poke_ev0, S_IWUSR, NULL, &iio_evgen_poke, 0);
+static IIO_DEVICE_ATTR(poke_ev1, S_IWUSR, NULL, &iio_evgen_poke, 1);
+static IIO_DEVICE_ATTR(poke_ev2, S_IWUSR, NULL, &iio_evgen_poke, 2);
+static IIO_DEVICE_ATTR(poke_ev3, S_IWUSR, NULL, &iio_evgen_poke, 3);
+static IIO_DEVICE_ATTR(poke_ev4, S_IWUSR, NULL, &iio_evgen_poke, 4);
+static IIO_DEVICE_ATTR(poke_ev5, S_IWUSR, NULL, &iio_evgen_poke, 5);
+static IIO_DEVICE_ATTR(poke_ev6, S_IWUSR, NULL, &iio_evgen_poke, 6);
+static IIO_DEVICE_ATTR(poke_ev7, S_IWUSR, NULL, &iio_evgen_poke, 7);
+static IIO_DEVICE_ATTR(poke_ev8, S_IWUSR, NULL, &iio_evgen_poke, 8);
+static IIO_DEVICE_ATTR(poke_ev9, S_IWUSR, NULL, &iio_evgen_poke, 9);
+
+static struct attribute *iio_evgen_attrs[] = {
+ &iio_dev_attr_poke_ev0.dev_attr.attr,
+ &iio_dev_attr_poke_ev1.dev_attr.attr,
+ &iio_dev_attr_poke_ev2.dev_attr.attr,
+ &iio_dev_attr_poke_ev3.dev_attr.attr,
+ &iio_dev_attr_poke_ev4.dev_attr.attr,
+ &iio_dev_attr_poke_ev5.dev_attr.attr,
+ &iio_dev_attr_poke_ev6.dev_attr.attr,
+ &iio_dev_attr_poke_ev7.dev_attr.attr,
+ &iio_dev_attr_poke_ev8.dev_attr.attr,
+ &iio_dev_attr_poke_ev9.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group iio_evgen_group = {
+ .attrs = iio_evgen_attrs,
+};
+
+static const struct attribute_group *iio_evgen_groups[] = {
+ &iio_evgen_group,
+ NULL
+};
+
+static struct device iio_evgen_dev = {
+ .bus = &iio_bus_type,
+ .groups = iio_evgen_groups,
+ .release = &iio_evgen_release,
+};
+
+static __init int iio_dummy_evgen_init(void)
+{
+ int ret = iio_dummy_evgen_create();
+
+ if (ret < 0)
+ return ret;
+ device_initialize(&iio_evgen_dev);
+ dev_set_name(&iio_evgen_dev, "iio_evgen");
+ return device_add(&iio_evgen_dev);
+}
+module_init(iio_dummy_evgen_init);
+
+static __exit void iio_dummy_evgen_exit(void)
+{
+ device_unregister(&iio_evgen_dev);
+}
+module_exit(iio_dummy_evgen_exit);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
+MODULE_DESCRIPTION("IIO dummy driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/dummy/iio_dummy_evgen.h b/drivers/iio/dummy/iio_dummy_evgen.h
new file mode 100644
index 0000000..d044b94
--- /dev/null
+++ b/drivers/iio/dummy/iio_dummy_evgen.h
@@ -0,0 +1,13 @@
+#ifndef _IIO_DUMMY_EVGEN_H_
+#define _IIO_DUMMY_EVGEN_H_
+
+struct iio_dummy_regs {
+ u32 reg_id;
+ u32 reg_data;
+};
+
+struct iio_dummy_regs *iio_dummy_evgen_get_regs(int irq);
+int iio_dummy_evgen_get_irq(void);
+void iio_dummy_evgen_release_irq(int irq);
+
+#endif /* _IIO_DUMMY_EVGEN_H_ */
diff --git a/drivers/iio/dummy/iio_simple_dummy.c b/drivers/iio/dummy/iio_simple_dummy.c
new file mode 100644
index 0000000..381f90f
--- /dev/null
+++ b/drivers/iio/dummy/iio_simple_dummy.c
@@ -0,0 +1,748 @@
+/**
+ * Copyright (c) 2011 Jonathan Cameron
+ *
+ * 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.
+ *
+ * A reference industrial I/O driver to illustrate the functionality available.
+ *
+ * There are numerous real drivers to illustrate the finer points.
+ * The purpose of this driver is to provide a driver with far more comments
+ * and explanatory notes than any 'real' driver would have.
+ * Anyone starting out writing an IIO driver should first make sure they
+ * understand all of this driver except those bits specifically marked
+ * as being present to allow us to 'fake' the presence of hardware.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/iio/buffer.h>
+#include "iio_simple_dummy.h"
+
+/*
+ * A few elements needed to fake a bus for this driver
+ * Note instances parameter controls how many of these
+ * dummy devices are registered.
+ */
+static unsigned instances = 1;
+module_param(instances, uint, 0);
+
+/* Pointer array used to fake bus elements */
+static struct iio_dev **iio_dummy_devs;
+
+/* Fake a name for the part number, usually obtained from the id table */
+static const char *iio_dummy_part_number = "iio_dummy_part_no";
+
+/**
+ * struct iio_dummy_accel_calibscale - realworld to register mapping
+ * @val: first value in read_raw - here integer part.
+ * @val2: second value in read_raw etc - here micro part.
+ * @regval: register value - magic device specific numbers.
+ */
+struct iio_dummy_accel_calibscale {
+ int val;
+ int val2;
+ int regval; /* what would be written to hardware */
+};
+
+static const struct iio_dummy_accel_calibscale dummy_scales[] = {
+ { 0, 100, 0x8 }, /* 0.000100 */
+ { 0, 133, 0x7 }, /* 0.000133 */
+ { 733, 13, 0x9 }, /* 733.000013 */
+};
+
+#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
+
+/*
+ * simple event - triggered when value rises above
+ * a threshold
+ */
+static const struct iio_event_spec iio_dummy_event = {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
+};
+
+/*
+ * simple step detect event - triggered when a step is detected
+ */
+static const struct iio_event_spec step_detect_event = {
+ .type = IIO_EV_TYPE_CHANGE,
+ .dir = IIO_EV_DIR_NONE,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+};
+
+/*
+ * simple transition event - triggered when the reported running confidence
+ * value rises above a threshold value
+ */
+static const struct iio_event_spec iio_running_event = {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
+};
+
+/*
+ * simple transition event - triggered when the reported walking confidence
+ * value falls under a threshold value
+ */
+static const struct iio_event_spec iio_walking_event = {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE),
+};
+#endif
+
+/*
+ * iio_dummy_channels - Description of available channels
+ *
+ * This array of structures tells the IIO core about what the device
+ * actually provides for a given channel.
+ */
+static const struct iio_chan_spec iio_dummy_channels[] = {
+ /* indexed ADC channel in_voltage0_raw etc */
+ {
+ .type = IIO_VOLTAGE,
+ /* Channel has a numeric index of 0 */
+ .indexed = 1,
+ .channel = 0,
+ /* What other information is available? */
+ .info_mask_separate =
+ /*
+ * in_voltage0_raw
+ * Raw (unscaled no bias removal etc) measurement
+ * from the device.
+ */
+ BIT(IIO_CHAN_INFO_RAW) |
+ /*
+ * in_voltage0_offset
+ * Offset for userspace to apply prior to scale
+ * when converting to standard units (microvolts)
+ */
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ /*
+ * in_voltage0_scale
+ * Multipler for userspace to apply post offset
+ * when converting to standard units (microvolts)
+ */
+ BIT(IIO_CHAN_INFO_SCALE),
+ /*
+ * sampling_frequency
+ * The frequency in Hz at which the channels are sampled
+ */
+ .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ /* The ordering of elements in the buffer via an enum */
+ .scan_index = voltage0,
+ .scan_type = { /* Description of storage in buffer */
+ .sign = 'u', /* unsigned */
+ .realbits = 13, /* 13 bits */
+ .storagebits = 16, /* 16 bits used for storage */
+ .shift = 0, /* zero shift */
+ },
+#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
+ .event_spec = &iio_dummy_event,
+ .num_event_specs = 1,
+#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
+ },
+ /* Differential ADC channel in_voltage1-voltage2_raw etc*/
+ {
+ .type = IIO_VOLTAGE,
+ .differential = 1,
+ /*
+ * Indexing for differential channels uses channel
+ * for the positive part, channel2 for the negative.
+ */
+ .indexed = 1,
+ .channel = 1,
+ .channel2 = 2,
+ /*
+ * in_voltage1-voltage2_raw
+ * Raw (unscaled no bias removal etc) measurement
+ * from the device.
+ */
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ /*
+ * in_voltage-voltage_scale
+ * Shared version of scale - shared by differential
+ * input channels of type IIO_VOLTAGE.
+ */
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ /*
+ * sampling_frequency
+ * The frequency in Hz at which the channels are sampled
+ */
+ .scan_index = diffvoltage1m2,
+ .scan_type = { /* Description of storage in buffer */
+ .sign = 's', /* signed */
+ .realbits = 12, /* 12 bits */
+ .storagebits = 16, /* 16 bits used for storage */
+ .shift = 0, /* zero shift */
+ },
+ },
+ /* Differential ADC channel in_voltage3-voltage4_raw etc*/
+ {
+ .type = IIO_VOLTAGE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 3,
+ .channel2 = 4,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = diffvoltage3m4,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 11,
+ .storagebits = 16,
+ .shift = 0,
+ },
+ },
+ /*
+ * 'modified' (i.e. axis specified) acceleration channel
+ * in_accel_z_raw
+ */
+ {
+ .type = IIO_ACCEL,
+ .modified = 1,
+ /* Channel 2 is use for modifiers */
+ .channel2 = IIO_MOD_X,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ /*
+ * Internal bias and gain correction values. Applied
+ * by the hardware or driver prior to userspace
+ * seeing the readings. Typically part of hardware
+ * calibration.
+ */
+ BIT(IIO_CHAN_INFO_CALIBSCALE) |
+ BIT(IIO_CHAN_INFO_CALIBBIAS),
+ .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = accelx,
+ .scan_type = { /* Description of storage in buffer */
+ .sign = 's', /* signed */
+ .realbits = 16, /* 16 bits */
+ .storagebits = 16, /* 16 bits used for storage */
+ .shift = 0, /* zero shift */
+ },
+ },
+ /*
+ * Convenience macro for timestamps. 4 is the index in
+ * the buffer.
+ */
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+ /* DAC channel out_voltage0_raw */
+ {
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .scan_index = -1, /* No buffer support */
+ .output = 1,
+ .indexed = 1,
+ .channel = 0,
+ },
+ {
+ .type = IIO_STEPS,
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_ENABLE) |
+ BIT(IIO_CHAN_INFO_CALIBHEIGHT),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .scan_index = -1, /* No buffer support */
+#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
+ .event_spec = &step_detect_event,
+ .num_event_specs = 1,
+#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
+ },
+ {
+ .type = IIO_ACTIVITY,
+ .modified = 1,
+ .channel2 = IIO_MOD_RUNNING,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .scan_index = -1, /* No buffer support */
+#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
+ .event_spec = &iio_running_event,
+ .num_event_specs = 1,
+#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
+ },
+ {
+ .type = IIO_ACTIVITY,
+ .modified = 1,
+ .channel2 = IIO_MOD_WALKING,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .scan_index = -1, /* No buffer support */
+#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
+ .event_spec = &iio_walking_event,
+ .num_event_specs = 1,
+#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
+ },
+};
+
+/**
+ * iio_dummy_read_raw() - data read function.
+ * @indio_dev: the struct iio_dev associated with this device instance
+ * @chan: the channel whose data is to be read
+ * @val: first element of returned value (typically INT)
+ * @val2: second element of returned value (typically MICRO)
+ * @mask: what we actually want to read as per the info_mask_*
+ * in iio_chan_spec.
+ */
+static int iio_dummy_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ struct iio_dummy_state *st = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ mutex_lock(&st->lock);
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: /* magic value - channel value read */
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ if (chan->output) {
+ /* Set integer part to cached value */
+ *val = st->dac_val;
+ ret = IIO_VAL_INT;
+ } else if (chan->differential) {
+ if (chan->channel == 1)
+ *val = st->differential_adc_val[0];
+ else
+ *val = st->differential_adc_val[1];
+ ret = IIO_VAL_INT;
+ } else {
+ *val = st->single_ended_adc_val;
+ ret = IIO_VAL_INT;
+ }
+ break;
+ case IIO_ACCEL:
+ *val = st->accel_val;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_STEPS:
+ *val = st->steps;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_ACTIVITY:
+ switch (chan->channel2) {
+ case IIO_MOD_RUNNING:
+ *val = st->activity_running;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_MOD_WALKING:
+ *val = st->activity_walking;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ /* only single ended adc -> 7 */
+ *val = 7;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ switch (chan->differential) {
+ case 0:
+ /* only single ended adc -> 0.001333 */
+ *val = 0;
+ *val2 = 1333;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case 1:
+ /* all differential adc channels ->
+ * 0.000001344 */
+ *val = 0;
+ *val2 = 1344;
+ ret = IIO_VAL_INT_PLUS_NANO;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ /* only the acceleration axis - read from cache */
+ *val = st->accel_calibbias;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_CALIBSCALE:
+ *val = st->accel_calibscale->val;
+ *val2 = st->accel_calibscale->val2;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = 3;
+ *val2 = 33;
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ case IIO_CHAN_INFO_ENABLE:
+ switch (chan->type) {
+ case IIO_STEPS:
+ *val = st->steps_enabled;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_CALIBHEIGHT:
+ switch (chan->type) {
+ case IIO_STEPS:
+ *val = st->height;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+
+ default:
+ break;
+ }
+ mutex_unlock(&st->lock);
+ return ret;
+}
+
+/**
+ * iio_dummy_write_raw() - data write function.
+ * @indio_dev: the struct iio_dev associated with this device instance
+ * @chan: the channel whose data is to be written
+ * @val: first element of value to set (typically INT)
+ * @val2: second element of value to set (typically MICRO)
+ * @mask: what we actually want to write as per the info_mask_*
+ * in iio_chan_spec.
+ *
+ * Note that all raw writes are assumed IIO_VAL_INT and info mask elements
+ * are assumed to be IIO_INT_PLUS_MICRO unless the callback write_raw_get_fmt
+ * in struct iio_info is provided by the driver.
+ */
+static int iio_dummy_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ int i;
+ int ret = 0;
+ struct iio_dummy_state *st = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ if (chan->output == 0)
+ return -EINVAL;
+
+ /* Locking not required as writing single value */
+ mutex_lock(&st->lock);
+ st->dac_val = val;
+ mutex_unlock(&st->lock);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_STEPS:
+ mutex_lock(&st->lock);
+ st->steps = val;
+ mutex_unlock(&st->lock);
+ return 0;
+ case IIO_ACTIVITY:
+ if (val < 0)
+ val = 0;
+ if (val > 100)
+ val = 100;
+ switch (chan->channel2) {
+ case IIO_MOD_RUNNING:
+ st->activity_running = val;
+ return 0;
+ case IIO_MOD_WALKING:
+ st->activity_walking = val;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_CALIBSCALE:
+ mutex_lock(&st->lock);
+ /* Compare against table - hard matching here */
+ for (i = 0; i < ARRAY_SIZE(dummy_scales); i++)
+ if (val == dummy_scales[i].val &&
+ val2 == dummy_scales[i].val2)
+ break;
+ if (i == ARRAY_SIZE(dummy_scales))
+ ret = -EINVAL;
+ else
+ st->accel_calibscale = &dummy_scales[i];
+ mutex_unlock(&st->lock);
+ return ret;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ mutex_lock(&st->lock);
+ st->accel_calibbias = val;
+ mutex_unlock(&st->lock);
+ return 0;
+ case IIO_CHAN_INFO_ENABLE:
+ switch (chan->type) {
+ case IIO_STEPS:
+ mutex_lock(&st->lock);
+ st->steps_enabled = val;
+ mutex_unlock(&st->lock);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_CALIBHEIGHT:
+ switch (chan->type) {
+ case IIO_STEPS:
+ st->height = val;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ default:
+ return -EINVAL;
+ }
+}
+
+/*
+ * Device type specific information.
+ */
+static const struct iio_info iio_dummy_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &iio_dummy_read_raw,
+ .write_raw = &iio_dummy_write_raw,
+#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
+ .read_event_config = &iio_simple_dummy_read_event_config,
+ .write_event_config = &iio_simple_dummy_write_event_config,
+ .read_event_value = &iio_simple_dummy_read_event_value,
+ .write_event_value = &iio_simple_dummy_write_event_value,
+#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
+};
+
+/**
+ * iio_dummy_init_device() - device instance specific init
+ * @indio_dev: the iio device structure
+ *
+ * Most drivers have one of these to set up default values,
+ * reset the device to known state etc.
+ */
+static int iio_dummy_init_device(struct iio_dev *indio_dev)
+{
+ struct iio_dummy_state *st = iio_priv(indio_dev);
+
+ st->dac_val = 0;
+ st->single_ended_adc_val = 73;
+ st->differential_adc_val[0] = 33;
+ st->differential_adc_val[1] = -34;
+ st->accel_val = 34;
+ st->accel_calibbias = -7;
+ st->accel_calibscale = &dummy_scales[0];
+ st->steps = 47;
+ st->activity_running = 98;
+ st->activity_walking = 4;
+
+ return 0;
+}
+
+/**
+ * iio_dummy_probe() - device instance probe
+ * @index: an id number for this instance.
+ *
+ * Arguments are bus type specific.
+ * I2C: iio_dummy_probe(struct i2c_client *client,
+ * const struct i2c_device_id *id)
+ * SPI: iio_dummy_probe(struct spi_device *spi)
+ */
+static int iio_dummy_probe(int index)
+{
+ int ret;
+ struct iio_dev *indio_dev;
+ struct iio_dummy_state *st;
+