diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-trigger-sysfs b/drivers/staging/iio/Documentation/sysfs-bus-iio-trigger-sysfs new file mode 100644 index 000000000000..5235e6c749ab --- /dev/null +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-trigger-sysfs @@ -0,0 +1,11 @@ +What: /sys/bus/iio/devices/triggerX/trigger_now +KernelVersion: 2.6.38 +Contact: linux-iio@vger.kernel.org +Description: + This file is provided by the iio-trig-sysfs stand-alone trigger + driver. Writing this file with any value triggers an event + driven driver, associated with this trigger, to capture data + into an in kernel buffer. This approach can be valuable during + automated testing or in situations, where other trigger methods + are not applicable. For example no RTC or spare GPIOs. + X is the IIO index of the trigger. diff --git a/drivers/staging/iio/trigger/Kconfig b/drivers/staging/iio/trigger/Kconfig index d842a584a3af..3a82013e2b8b 100644 --- a/drivers/staging/iio/trigger/Kconfig +++ b/drivers/staging/iio/trigger/Kconfig @@ -18,4 +18,14 @@ config IIO_GPIO_TRIGGER help Provides support for using GPIO pins as IIO triggers. +config IIO_SYSFS_TRIGGER + tristate "SYSFS trigger" + depends on SYSFS + help + Provides support for using SYSFS entry as IIO triggers. + If unsure, say N (but it's safe to say "Y"). + + To compile this driver as a module, choose M here: the + module will be called iio-trig-sysfs. + endif # IIO_TRIGGER diff --git a/drivers/staging/iio/trigger/Makefile b/drivers/staging/iio/trigger/Makefile index 10aeca5e347a..504b9c07970c 100644 --- a/drivers/staging/iio/trigger/Makefile +++ b/drivers/staging/iio/trigger/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_IIO_PERIODIC_RTC_TRIGGER) += iio-trig-periodic-rtc.o obj-$(CONFIG_IIO_GPIO_TRIGGER) += iio-trig-gpio.o +obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o diff --git a/drivers/staging/iio/trigger/iio-trig-sysfs.c b/drivers/staging/iio/trigger/iio-trig-sysfs.c new file mode 100644 index 000000000000..127a2a33e4db --- /dev/null +++ b/drivers/staging/iio/trigger/iio-trig-sysfs.c @@ -0,0 +1,108 @@ +/* + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + * + */ + +#include +#include +#include +#include + +#include "../iio.h" +#include "../trigger.h" + +static ssize_t iio_sysfs_trigger_poll(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct iio_trigger *trig = dev_get_drvdata(dev); + iio_trigger_poll(trig, 0); + + return count; +} + +static DEVICE_ATTR(trigger_now, S_IWUSR, NULL, iio_sysfs_trigger_poll); +static IIO_TRIGGER_NAME_ATTR; + +static struct attribute *iio_sysfs_trigger_attrs[] = { + &dev_attr_trigger_now.attr, + &dev_attr_name.attr, + NULL, +}; + +static const struct attribute_group iio_sysfs_trigger_attr_group = { + .attrs = iio_sysfs_trigger_attrs, +}; + +static int __devinit iio_sysfs_trigger_probe(struct platform_device *pdev) +{ + struct iio_trigger *trig; + int ret; + + trig = iio_allocate_trigger(); + if (!trig) { + ret = -ENOMEM; + goto out1; + } + + trig->control_attrs = &iio_sysfs_trigger_attr_group; + trig->owner = THIS_MODULE; + trig->name = kasprintf(GFP_KERNEL, "sysfstrig%d", pdev->id); + if (trig->name == NULL) { + ret = -ENOMEM; + goto out2; + } + + ret = iio_trigger_register(trig); + if (ret) + goto out3; + + platform_set_drvdata(pdev, trig); + + return 0; +out3: + kfree(trig->name); +out2: + iio_put_trigger(trig); +out1: + + return ret; +} + +static int __devexit iio_sysfs_trigger_remove(struct platform_device *pdev) +{ + struct iio_trigger *trig = platform_get_drvdata(pdev); + + iio_trigger_unregister(trig); + kfree(trig->name); + iio_put_trigger(trig); + + return 0; +} + +static struct platform_driver iio_sysfs_trigger_driver = { + .driver = { + .name = "iio_sysfs_trigger", + .owner = THIS_MODULE, + }, + .probe = iio_sysfs_trigger_probe, + .remove = __devexit_p(iio_sysfs_trigger_remove), +}; + +static int __init iio_sysfs_trig_init(void) +{ + return platform_driver_register(&iio_sysfs_trigger_driver); +} +module_init(iio_sysfs_trig_init); + +static void __exit iio_sysfs_trig_exit(void) +{ + platform_driver_unregister(&iio_sysfs_trigger_driver); +} +module_exit(iio_sysfs_trig_exit); + +MODULE_AUTHOR("Michael Hennerich "); +MODULE_DESCRIPTION("Sysfs based trigger for the iio subsystem"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:iio-trig-sysfs");