diff options
Diffstat (limited to 'kernel/drivers/staging/iio/meter/ade7758_trigger.c')
-rw-r--r-- | kernel/drivers/staging/iio/meter/ade7758_trigger.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/kernel/drivers/staging/iio/meter/ade7758_trigger.c b/kernel/drivers/staging/iio/meter/ade7758_trigger.c new file mode 100644 index 000000000..5b35a7f08 --- /dev/null +++ b/kernel/drivers/staging/iio/meter/ade7758_trigger.c @@ -0,0 +1,109 @@ +/* + * ADE7758 Poly Phase Multifunction Energy Metering IC driver + * + * Copyright 2010-2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/spi/spi.h> +#include <linux/export.h> + +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include "ade7758.h" + +/** + * ade7758_data_rdy_trig_poll() the event handler for the data rdy trig + **/ +static irqreturn_t ade7758_data_rdy_trig_poll(int irq, void *private) +{ + disable_irq_nosync(irq); + iio_trigger_poll(private); + + return IRQ_HANDLED; +} + +/** + * ade7758_data_rdy_trigger_set_state() set datardy interrupt state + **/ +static int ade7758_data_rdy_trigger_set_state(struct iio_trigger *trig, + bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + + dev_dbg(&indio_dev->dev, "%s (%d)\n", __func__, state); + return ade7758_set_irq(&indio_dev->dev, state); +} + +/** + * ade7758_trig_try_reen() try renabling irq for data rdy trigger + * @trig: the datardy trigger + **/ +static int ade7758_trig_try_reen(struct iio_trigger *trig) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + struct ade7758_state *st = iio_priv(indio_dev); + + enable_irq(st->us->irq); + /* irq reenabled so success! */ + return 0; +} + +static const struct iio_trigger_ops ade7758_trigger_ops = { + .owner = THIS_MODULE, + .set_trigger_state = &ade7758_data_rdy_trigger_set_state, + .try_reenable = &ade7758_trig_try_reen, +}; + +int ade7758_probe_trigger(struct iio_dev *indio_dev) +{ + struct ade7758_state *st = iio_priv(indio_dev); + int ret; + + st->trig = iio_trigger_alloc("%s-dev%d", + spi_get_device_id(st->us)->name, + indio_dev->id); + if (!st->trig) { + ret = -ENOMEM; + goto error_ret; + } + + ret = request_irq(st->us->irq, + ade7758_data_rdy_trig_poll, + IRQF_TRIGGER_LOW, + spi_get_device_id(st->us)->name, + st->trig); + if (ret) + goto error_free_trig; + + st->trig->dev.parent = &st->us->dev; + st->trig->ops = &ade7758_trigger_ops; + iio_trigger_set_drvdata(st->trig, indio_dev); + ret = iio_trigger_register(st->trig); + + /* select default trigger */ + indio_dev->trig = iio_trigger_get(st->trig); + if (ret) + goto error_free_irq; + + return 0; + +error_free_irq: + free_irq(st->us->irq, st->trig); +error_free_trig: + iio_trigger_free(st->trig); +error_ret: + return ret; +} + +void ade7758_remove_trigger(struct iio_dev *indio_dev) +{ + struct ade7758_state *st = iio_priv(indio_dev); + + iio_trigger_unregister(st->trig); + free_irq(st->us->irq, st->trig); + iio_trigger_free(st->trig); +} |