subject:"\[PATCH v9 4\/5\] iio\: trigger\: Introduce IIO hrtimer based trigger"

Re: [PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

2015-10-24 Thread Matt Ranostay

Tested-by: Matt Ranostay 

On Fri, Oct 23, 2015 at 5:32 AM, Daniel Baluta  wrote:
> This patch registers a new IIO software trigger interrupt source
> based on high resolution timers.
>
> Notice that if configfs is enabled we create sampling_frequency
> attribute allowing users to change hrtimer period (1/sampling_frequency).
>
> The IIO hrtimer trigger has a long history, this patch is based on
> an older version from Marten and Lars-Peter.
>
> Signed-off-by: Marten Svanfeldt 
> Signed-off-by: Lars-Peter Clausen 
> Signed-off-by: Daniel Baluta 
> ---
>  drivers/iio/trigger/Kconfig|  10 ++
>  drivers/iio/trigger/Makefile   |   2 +
>  drivers/iio/trigger/iio-trig-hrtimer.c | 193 
> +
>  3 files changed, 205 insertions(+)
>  create mode 100644 drivers/iio/trigger/iio-trig-hrtimer.c
>
> diff --git a/drivers/iio/trigger/Kconfig b/drivers/iio/trigger/Kconfig
> index 7999612..519e677 100644
> --- a/drivers/iio/trigger/Kconfig
> +++ b/drivers/iio/trigger/Kconfig
> @@ -5,6 +5,16 @@
>
>  menu "Triggers - standalone"
>
> +config IIO_HRTIMER_TRIGGER
> +   tristate "High resolution timer trigger"
> +   depends on IIO_SW_TRIGGER
> +   help
> + Provides a frequency based IIO trigger using high resolution
> + timers as interrupt source.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called iio-trig-hrtimer.
> +
>  config IIO_INTERRUPT_TRIGGER
> tristate "Generic interrupt trigger"
> help
> diff --git a/drivers/iio/trigger/Makefile b/drivers/iio/trigger/Makefile
> index 0694dae..fe06eb5 100644
> --- a/drivers/iio/trigger/Makefile
> +++ b/drivers/iio/trigger/Makefile
> @@ -3,5 +3,7 @@
>  #
>
>  # When adding new entries keep the list in alphabetical order
> +
> +obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o
>  obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
>  obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o
> diff --git a/drivers/iio/trigger/iio-trig-hrtimer.c 
> b/drivers/iio/trigger/iio-trig-hrtimer.c
> new file mode 100644
> index 000..5e6d451
> --- /dev/null
> +++ b/drivers/iio/trigger/iio-trig-hrtimer.c
> @@ -0,0 +1,193 @@
> +/**
> + * The industrial I/O periodic hrtimer trigger driver
> + *
> + * Copyright (C) Intuitive Aerial AB
> + * Written by Marten Svanfeldt, mar...@intuitiveaerial.com
> + * Copyright (C) 2012, Analog Device Inc.
> + * Author: Lars-Peter Clausen 
> + * Copyright (C) 2015, Intel Corporation
> + *
> + * 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.
> + *
> + */
> +#include 
> +#include 
> +#include 
> +
> +#include 
> +#include 
> +#include 
> +
> +/* default sampling frequency - 100Hz */
> +#define HRTIMER_DEFAULT_SAMPLING_FREQUENCY 100
> +
> +struct iio_hrtimer_info {
> +   struct iio_sw_trigger swt;
> +   struct hrtimer timer;
> +   unsigned long sampling_frequency;
> +   ktime_t period;
> +};
> +
> +static struct config_item_type iio_hrtimer_type = {
> +   .ct_owner = THIS_MODULE,
> +};
> +
> +static
> +ssize_t iio_hrtimer_show_sampling_frequency(struct device *dev,
> +   struct device_attribute *attr,
> +   char *buf)
> +{
> +   struct iio_trigger *trig = to_iio_trigger(dev);
> +   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
> +
> +   return snprintf(buf, PAGE_SIZE, "%lu\n", info->sampling_frequency);
> +}
> +
> +static
> +ssize_t iio_hrtimer_store_sampling_frequency(struct device *dev,
> +struct device_attribute *attr,
> +const char *buf, size_t len)
> +{
> +   struct iio_trigger *trig = to_iio_trigger(dev);
> +   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
> +   unsigned long val;
> +   int ret;
> +
> +   ret = kstrtoul(buf, 10, );
> +   if (ret)
> +   return ret;
> +
> +   if (!val || val > NSEC_PER_SEC)
> +   return -EINVAL;
> +
> +   info->sampling_frequency = val;
> +   info->period = ktime_set(0, NSEC_PER_SEC / val);
> +
> +   return len;
> +}
> +
> +static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
> +  iio_hrtimer_show_sampling_frequency,
> +  iio_hrtimer_store_sampling_frequency);
> +
> +static struct attribute *iio_hrtimer_attrs[] = {
> +   _attr_sampling_frequency.attr,
> +   NULL
> +};
> +
> +static const struct attribute_group iio_hrtimer_attr_group = {
> +   .attrs = iio_hrtimer_attrs,
> +};
> +
> +static const struct attribute_group *iio_hrtimer_attr_groups[] = {
> +   _hrtimer_attr_group,
> +   NULL
> +};
> +
> +static enum hrtimer_restart iio_hrtimer_trig_handler(struct hrtimer *timer)
> +{
> +

Re: [PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

2015-10-24 Thread Matt Ranostay

Tested-by: Matt Ranostay 

On Fri, Oct 23, 2015 at 5:32 AM, Daniel Baluta  wrote:
> This patch registers a new IIO software trigger interrupt source
> based on high resolution timers.
>
> Notice that if configfs is enabled we create sampling_frequency
> attribute allowing users to change hrtimer period (1/sampling_frequency).
>
> The IIO hrtimer trigger has a long history, this patch is based on
> an older version from Marten and Lars-Peter.
>
> Signed-off-by: Marten Svanfeldt 
> Signed-off-by: Lars-Peter Clausen 
> Signed-off-by: Daniel Baluta 
> ---
>  drivers/iio/trigger/Kconfig|  10 ++
>  drivers/iio/trigger/Makefile   |   2 +
>  drivers/iio/trigger/iio-trig-hrtimer.c | 193 
> +
>  3 files changed, 205 insertions(+)
>  create mode 100644 drivers/iio/trigger/iio-trig-hrtimer.c
>
> diff --git a/drivers/iio/trigger/Kconfig b/drivers/iio/trigger/Kconfig
> index 7999612..519e677 100644
> --- a/drivers/iio/trigger/Kconfig
> +++ b/drivers/iio/trigger/Kconfig
> @@ -5,6 +5,16 @@
>
>  menu "Triggers - standalone"
>
> +config IIO_HRTIMER_TRIGGER
> +   tristate "High resolution timer trigger"
> +   depends on IIO_SW_TRIGGER
> +   help
> + Provides a frequency based IIO trigger using high resolution
> + timers as interrupt source.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called iio-trig-hrtimer.
> +
>  config IIO_INTERRUPT_TRIGGER
> tristate "Generic interrupt trigger"
> help
> diff --git a/drivers/iio/trigger/Makefile b/drivers/iio/trigger/Makefile
> index 0694dae..fe06eb5 100644
> --- a/drivers/iio/trigger/Makefile
> +++ b/drivers/iio/trigger/Makefile
> @@ -3,5 +3,7 @@
>  #
>
>  # When adding new entries keep the list in alphabetical order
> +
> +obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o
>  obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
>  obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o
> diff --git a/drivers/iio/trigger/iio-trig-hrtimer.c 
> b/drivers/iio/trigger/iio-trig-hrtimer.c
> new file mode 100644
> index 000..5e6d451
> --- /dev/null
> +++ b/drivers/iio/trigger/iio-trig-hrtimer.c
> @@ -0,0 +1,193 @@
> +/**
> + * The industrial I/O periodic hrtimer trigger driver
> + *
> + * Copyright (C) Intuitive Aerial AB
> + * Written by Marten Svanfeldt, mar...@intuitiveaerial.com
> + * Copyright (C) 2012, Analog Device Inc.
> + * Author: Lars-Peter Clausen 
> + * Copyright (C) 2015, Intel Corporation
> + *
> + * 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.
> + *
> + */
> +#include 
> +#include 
> +#include 
> +
> +#include 
> +#include 
> +#include 
> +
> +/* default sampling frequency - 100Hz */
> +#define HRTIMER_DEFAULT_SAMPLING_FREQUENCY 100
> +
> +struct iio_hrtimer_info {
> +   struct iio_sw_trigger swt;
> +   struct hrtimer timer;
> +   unsigned long sampling_frequency;
> +   ktime_t period;
> +};
> +
> +static struct config_item_type iio_hrtimer_type = {
> +   .ct_owner = THIS_MODULE,
> +};
> +
> +static
> +ssize_t iio_hrtimer_show_sampling_frequency(struct device *dev,
> +   struct device_attribute *attr,
> +   char *buf)
> +{
> +   struct iio_trigger *trig = to_iio_trigger(dev);
> +   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
> +
> +   return snprintf(buf, PAGE_SIZE, "%lu\n", info->sampling_frequency);
> +}
> +
> +static
> +ssize_t iio_hrtimer_store_sampling_frequency(struct device *dev,
> +struct device_attribute *attr,
> +const char *buf, size_t len)
> +{
> +   struct iio_trigger *trig = to_iio_trigger(dev);
> +   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
> +   unsigned long val;
> +   int ret;
> +
> +   ret = kstrtoul(buf, 10, );
> +   if (ret)
> +   return ret;
> +
> +   if (!val || val > NSEC_PER_SEC)
> +   return -EINVAL;
> +
> +   info->sampling_frequency = val;
> +   info->period = ktime_set(0, NSEC_PER_SEC / val);
> +
> +   return len;
> +}
> +
> +static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
> +  iio_hrtimer_show_sampling_frequency,
> +  iio_hrtimer_store_sampling_frequency);
> +
> +static struct attribute *iio_hrtimer_attrs[] = {
> +   _attr_sampling_frequency.attr,
> +   NULL
> +};
> +
> +static const struct attribute_group iio_hrtimer_attr_group = {
> +   .attrs = iio_hrtimer_attrs,
> +};
> +
> +static const struct attribute_group *iio_hrtimer_attr_groups[] = {
> +

[PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

2015-10-23 Thread Daniel Baluta

This patch registers a new IIO software trigger interrupt source
based on high resolution timers.

Notice that if configfs is enabled we create sampling_frequency
attribute allowing users to change hrtimer period (1/sampling_frequency).

The IIO hrtimer trigger has a long history, this patch is based on
an older version from Marten and Lars-Peter.

Signed-off-by: Marten Svanfeldt 
Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Daniel Baluta 
---
 drivers/iio/trigger/Kconfig|  10 ++
 drivers/iio/trigger/Makefile   |   2 +
 drivers/iio/trigger/iio-trig-hrtimer.c | 193 +
 3 files changed, 205 insertions(+)
 create mode 100644 drivers/iio/trigger/iio-trig-hrtimer.c

diff --git a/drivers/iio/trigger/Kconfig b/drivers/iio/trigger/Kconfig
index 7999612..519e677 100644
--- a/drivers/iio/trigger/Kconfig
+++ b/drivers/iio/trigger/Kconfig
@@ -5,6 +5,16 @@
 
 menu "Triggers - standalone"
 
+config IIO_HRTIMER_TRIGGER
+   tristate "High resolution timer trigger"
+   depends on IIO_SW_TRIGGER
+   help
+ Provides a frequency based IIO trigger using high resolution
+ timers as interrupt source.
+
+ To compile this driver as a module, choose M here: the
+ module will be called iio-trig-hrtimer.
+
 config IIO_INTERRUPT_TRIGGER
tristate "Generic interrupt trigger"
help
diff --git a/drivers/iio/trigger/Makefile b/drivers/iio/trigger/Makefile
index 0694dae..fe06eb5 100644
--- a/drivers/iio/trigger/Makefile
+++ b/drivers/iio/trigger/Makefile
@@ -3,5 +3,7 @@
 #
 
 # When adding new entries keep the list in alphabetical order
+
+obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o
 obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
 obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o
diff --git a/drivers/iio/trigger/iio-trig-hrtimer.c 
b/drivers/iio/trigger/iio-trig-hrtimer.c
new file mode 100644
index 000..5e6d451
--- /dev/null
+++ b/drivers/iio/trigger/iio-trig-hrtimer.c
@@ -0,0 +1,193 @@
+/**
+ * The industrial I/O periodic hrtimer trigger driver
+ *
+ * Copyright (C) Intuitive Aerial AB
+ * Written by Marten Svanfeldt, mar...@intuitiveaerial.com
+ * Copyright (C) 2012, Analog Device Inc.
+ * Author: Lars-Peter Clausen 
+ * Copyright (C) 2015, Intel Corporation
+ *
+ * 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.
+ *
+ */
+#include 
+#include 
+#include 
+
+#include 
+#include 
+#include 
+
+/* default sampling frequency - 100Hz */
+#define HRTIMER_DEFAULT_SAMPLING_FREQUENCY 100
+
+struct iio_hrtimer_info {
+   struct iio_sw_trigger swt;
+   struct hrtimer timer;
+   unsigned long sampling_frequency;
+   ktime_t period;
+};
+
+static struct config_item_type iio_hrtimer_type = {
+   .ct_owner = THIS_MODULE,
+};
+
+static
+ssize_t iio_hrtimer_show_sampling_frequency(struct device *dev,
+   struct device_attribute *attr,
+   char *buf)
+{
+   struct iio_trigger *trig = to_iio_trigger(dev);
+   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
+
+   return snprintf(buf, PAGE_SIZE, "%lu\n", info->sampling_frequency);
+}
+
+static
+ssize_t iio_hrtimer_store_sampling_frequency(struct device *dev,
+struct device_attribute *attr,
+const char *buf, size_t len)
+{
+   struct iio_trigger *trig = to_iio_trigger(dev);
+   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
+   unsigned long val;
+   int ret;
+
+   ret = kstrtoul(buf, 10, );
+   if (ret)
+   return ret;
+
+   if (!val || val > NSEC_PER_SEC)
+   return -EINVAL;
+
+   info->sampling_frequency = val;
+   info->period = ktime_set(0, NSEC_PER_SEC / val);
+
+   return len;
+}
+
+static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
+  iio_hrtimer_show_sampling_frequency,
+  iio_hrtimer_store_sampling_frequency);
+
+static struct attribute *iio_hrtimer_attrs[] = {
+   _attr_sampling_frequency.attr,
+   NULL
+};
+
+static const struct attribute_group iio_hrtimer_attr_group = {
+   .attrs = iio_hrtimer_attrs,
+};
+
+static const struct attribute_group *iio_hrtimer_attr_groups[] = {
+   _hrtimer_attr_group,
+   NULL
+};
+
+static enum hrtimer_restart iio_hrtimer_trig_handler(struct hrtimer *timer)
+{
+   struct iio_hrtimer_info *info;
+
+   info = container_of(timer, struct iio_hrtimer_info, timer);
+
+   hrtimer_forward_now(timer, info->period);
+   iio_trigger_poll(info->swt.trigger);
+
+   return HRTIMER_RESTART;
+}
+
+static int iio_trig_hrtimer_set_state(struct iio_trigger *trig, bool state)
+{
+   struct iio_hrtimer_info *trig_info;
+
+

[PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

2015-10-23 Thread Daniel Baluta

This patch registers a new IIO software trigger interrupt source
based on high resolution timers.

Notice that if configfs is enabled we create sampling_frequency
attribute allowing users to change hrtimer period (1/sampling_frequency).

The IIO hrtimer trigger has a long history, this patch is based on
an older version from Marten and Lars-Peter.

Signed-off-by: Marten Svanfeldt 
Signed-off-by: Lars-Peter Clausen 
Signed-off-by: Daniel Baluta 
---
 drivers/iio/trigger/Kconfig|  10 ++
 drivers/iio/trigger/Makefile   |   2 +
 drivers/iio/trigger/iio-trig-hrtimer.c | 193 +
 3 files changed, 205 insertions(+)
 create mode 100644 drivers/iio/trigger/iio-trig-hrtimer.c

diff --git a/drivers/iio/trigger/Kconfig b/drivers/iio/trigger/Kconfig
index 7999612..519e677 100644
--- a/drivers/iio/trigger/Kconfig
+++ b/drivers/iio/trigger/Kconfig
@@ -5,6 +5,16 @@
 
 menu "Triggers - standalone"
 
+config IIO_HRTIMER_TRIGGER
+   tristate "High resolution timer trigger"
+   depends on IIO_SW_TRIGGER
+   help
+ Provides a frequency based IIO trigger using high resolution
+ timers as interrupt source.
+
+ To compile this driver as a module, choose M here: the
+ module will be called iio-trig-hrtimer.
+
 config IIO_INTERRUPT_TRIGGER
tristate "Generic interrupt trigger"
help
diff --git a/drivers/iio/trigger/Makefile b/drivers/iio/trigger/Makefile
index 0694dae..fe06eb5 100644
--- a/drivers/iio/trigger/Makefile
+++ b/drivers/iio/trigger/Makefile
@@ -3,5 +3,7 @@
 #
 
 # When adding new entries keep the list in alphabetical order
+
+obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o
 obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
 obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o
diff --git a/drivers/iio/trigger/iio-trig-hrtimer.c 
b/drivers/iio/trigger/iio-trig-hrtimer.c
new file mode 100644
index 000..5e6d451
--- /dev/null
+++ b/drivers/iio/trigger/iio-trig-hrtimer.c
@@ -0,0 +1,193 @@
+/**
+ * The industrial I/O periodic hrtimer trigger driver
+ *
+ * Copyright (C) Intuitive Aerial AB
+ * Written by Marten Svanfeldt, mar...@intuitiveaerial.com
+ * Copyright (C) 2012, Analog Device Inc.
+ * Author: Lars-Peter Clausen 
+ * Copyright (C) 2015, Intel Corporation
+ *
+ * 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.
+ *
+ */
+#include 
+#include 
+#include 
+
+#include 
+#include 
+#include 
+
+/* default sampling frequency - 100Hz */
+#define HRTIMER_DEFAULT_SAMPLING_FREQUENCY 100
+
+struct iio_hrtimer_info {
+   struct iio_sw_trigger swt;
+   struct hrtimer timer;
+   unsigned long sampling_frequency;
+   ktime_t period;
+};
+
+static struct config_item_type iio_hrtimer_type = {
+   .ct_owner = THIS_MODULE,
+};
+
+static
+ssize_t iio_hrtimer_show_sampling_frequency(struct device *dev,
+   struct device_attribute *attr,
+   char *buf)
+{
+   struct iio_trigger *trig = to_iio_trigger(dev);
+   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
+
+   return snprintf(buf, PAGE_SIZE, "%lu\n", info->sampling_frequency);
+}
+
+static
+ssize_t iio_hrtimer_store_sampling_frequency(struct device *dev,
+struct device_attribute *attr,
+const char *buf, size_t len)
+{
+   struct iio_trigger *trig = to_iio_trigger(dev);
+   struct iio_hrtimer_info *info = iio_trigger_get_drvdata(trig);
+   unsigned long val;
+   int ret;
+
+   ret = kstrtoul(buf, 10, );
+   if (ret)
+   return ret;
+
+   if (!val || val > NSEC_PER_SEC)
+   return -EINVAL;
+
+   info->sampling_frequency = val;
+   info->period = ktime_set(0, NSEC_PER_SEC / val);
+
+   return len;
+}
+
+static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
+  iio_hrtimer_show_sampling_frequency,
+  iio_hrtimer_store_sampling_frequency);
+
+static struct attribute *iio_hrtimer_attrs[] = {
+   _attr_sampling_frequency.attr,
+   NULL
+};
+
+static const struct attribute_group iio_hrtimer_attr_group = {
+   .attrs = iio_hrtimer_attrs,
+};
+
+static const struct attribute_group *iio_hrtimer_attr_groups[] = {
+   _hrtimer_attr_group,
+   NULL
+};
+
+static enum hrtimer_restart iio_hrtimer_trig_handler(struct hrtimer *timer)
+{
+   struct iio_hrtimer_info *info;
+
+   info = container_of(timer, struct iio_hrtimer_info, timer);
+
+   hrtimer_forward_now(timer, info->period);
+   iio_trigger_poll(info->swt.trigger);
+
+   return HRTIMER_RESTART;
+}
+
+static int iio_trig_hrtimer_set_state(struct

Re: [PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

Re: [PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

[PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

[PATCH v9 4/5] iio: trigger: Introduce IIO hrtimer based trigger

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