Staging: iio: Move evgen interrupt generation to irq_work
Enhance interrupt generation in the dummy driver and expand its usage by introducing the irq_work infrastructure to trigger an interrupt. This way, the irq_work_queue() wrapper permits calling both of the top half and threaded part from a hard irq context, unlike handle_nested_irq(), which only calls the threaded part. As an outcome, the driver succeeds in simulating real hardware interrupts, while keeping the normal interrupt flow. Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com> Acked-by: Daniel Baluta <daniel.baluta@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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cd8d97774f
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fd2bb310ca
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@ -24,9 +24,21 @@
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#include "iio_dummy_evgen.h"
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/irq_work.h>
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/* Fiddly bit of faking and irq without hardware */
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#define IIO_EVENTGEN_NO 10
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/**
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* struct iio_dummy_handle_irq - helper struct to simulate interrupt generation
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* @work: irq_work used to run handlers from hardirq context
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* @irq: fake irq line number to trigger an interrupt
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*/
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struct iio_dummy_handle_irq {
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struct irq_work work;
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int irq;
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};
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/**
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* struct iio_dummy_evgen - evgen state
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* @chip: irq chip we are faking
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@ -35,6 +47,7 @@
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* @inuse: mask of which irqs are connected
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* @regs: irq regs we are faking
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* @lock: protect the evgen state
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* @handler: helper for a 'hardware-like' interrupt simulation
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*/
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struct iio_dummy_eventgen {
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struct irq_chip chip;
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@ -43,6 +56,7 @@ struct iio_dummy_eventgen {
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bool inuse[IIO_EVENTGEN_NO];
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struct iio_dummy_regs regs[IIO_EVENTGEN_NO];
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struct mutex lock;
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struct iio_dummy_handle_irq handler;
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};
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/* We can only ever have one instance of this 'device' */
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@ -67,6 +81,14 @@ static void iio_dummy_event_irqunmask(struct irq_data *d)
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evgen->enabled[d->irq - evgen->base] = true;
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}
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static void iio_dummy_work_handler(struct irq_work *work)
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{
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struct iio_dummy_handle_irq *irq_handler;
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irq_handler = container_of(work, struct iio_dummy_handle_irq, work);
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handle_simple_irq(irq_handler->irq, irq_to_desc(irq_handler->irq));
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}
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static int iio_dummy_evgen_create(void)
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{
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int ret, i;
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@ -91,6 +113,7 @@ static int iio_dummy_evgen_create(void)
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IRQ_NOREQUEST | IRQ_NOAUTOEN,
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IRQ_NOPROBE);
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}
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init_irq_work(&iio_evgen->handler.work, iio_dummy_work_handler);
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mutex_init(&iio_evgen->lock);
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return 0;
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}
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@ -169,8 +192,9 @@ static ssize_t iio_evgen_poke(struct device *dev,
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iio_evgen->regs[this_attr->address].reg_id = this_attr->address;
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iio_evgen->regs[this_attr->address].reg_data = event;
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iio_evgen->handler.irq = iio_evgen->base + this_attr->address;
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if (iio_evgen->enabled[this_attr->address])
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handle_nested_irq(iio_evgen->base + this_attr->address);
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irq_work_queue(&iio_evgen->handler.work);
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return len;
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}
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@ -46,6 +46,7 @@ struct iio_dummy_state {
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int event_irq;
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int event_val;
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bool event_en;
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s64 event_timestamp;
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#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
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};
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@ -153,6 +153,15 @@ int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
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return 0;
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}
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static irqreturn_t iio_simple_dummy_get_timestamp(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct iio_dummy_state *st = iio_priv(indio_dev);
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st->event_timestamp = iio_get_time_ns();
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return IRQ_HANDLED;
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}
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/**
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* iio_simple_dummy_event_handler() - identify and pass on event
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* @irq: irq of event line
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@ -177,7 +186,7 @@ static irqreturn_t iio_simple_dummy_event_handler(int irq, void *private)
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IIO_EVENT_CODE(IIO_VOLTAGE, 0, 0,
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IIO_EV_DIR_RISING,
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IIO_EV_TYPE_THRESH, 0, 0, 0),
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iio_get_time_ns());
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st->event_timestamp);
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break;
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case 1:
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if (st->activity_running > st->event_val)
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@ -187,7 +196,7 @@ static irqreturn_t iio_simple_dummy_event_handler(int irq, void *private)
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IIO_EV_DIR_RISING,
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IIO_EV_TYPE_THRESH,
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0, 0, 0),
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iio_get_time_ns());
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st->event_timestamp);
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break;
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case 2:
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if (st->activity_walking < st->event_val)
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@ -197,14 +206,14 @@ static irqreturn_t iio_simple_dummy_event_handler(int irq, void *private)
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IIO_EV_DIR_FALLING,
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IIO_EV_TYPE_THRESH,
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0, 0, 0),
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iio_get_time_ns());
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st->event_timestamp);
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break;
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case 3:
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iio_push_event(indio_dev,
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IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
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IIO_EV_DIR_NONE,
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IIO_EV_TYPE_CHANGE, 0, 0, 0),
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iio_get_time_ns());
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st->event_timestamp);
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break;
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default:
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break;
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@ -238,7 +247,7 @@ int iio_simple_dummy_events_register(struct iio_dev *indio_dev)
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st->regs = iio_dummy_evgen_get_regs(st->event_irq);
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ret = request_threaded_irq(st->event_irq,
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NULL,
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&iio_simple_dummy_get_timestamp,
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&iio_simple_dummy_event_handler,
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IRQF_ONESHOT,
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"iio_simple_event",
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