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staging:iio:adc:ad7476 move to irqchip based triggering 

Untested

V2: Fixed missing free of pollfunc->name pointed out by
Michael Hennerich.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron 2011-05-18 14:41:25 +01:00 committed by Greg Kroah-Hartman
parent c5e0819e2d
commit f20546e004
3 changed files with 26 additions and 46 deletions
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2
drivers/staging/iio/adc/ad7476.h
View File

@ -28,8 +28,6 @@ struct ad7476_state {
struct spi_device *spi;
const struct ad7476_chip_info *chip_info;
struct regulator *reg;
struct work_struct poll_work;
atomic_t protect_ring;
size_t d_size;
u16 int_vref_mv;
struct spi_transfer xfer;

4
drivers/staging/iio/adc/ad7476_core.c
View File

@ -6,13 +6,10 @@
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
@ -176,7 +173,6 @@ static int __devinit ad7476_probe(struct spi_device *spi)
spi_set_drvdata(spi, st);
atomic_set(&st->protect_ring, 0);
st->spi = spi;
st->indio_dev = iio_allocate_device(0);

66
drivers/staging/iio/adc/ad7476_ring.c
View File

@ -8,13 +8,10 @@
*/
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include "../iio.h"
@ -77,46 +74,19 @@ static int ad7476_ring_preenable(struct iio_dev *indio_dev)
return 0;
}
/**
* ad7476_poll_func_th() th of trigger launched polling to ring buffer
*
* As sampling only occurs on i2c comms occurring, leave timestamping until
* then. Some triggers will generate their own time stamp. Currently
* there is no way of notifying them when no one cares.
**/
static void ad7476_poll_func_th(struct iio_dev *indio_dev, s64 time)
static irqreturn_t ad7476_trigger_handler(int irq, void *p)
{
struct ad7476_state *st = indio_dev->dev_data;
schedule_work(&st->poll_work);
return;
}
/**
* ad7476_poll_bh_to_ring() bh of trigger launched polling to ring buffer
* @work_s: the work struct through which this was scheduled
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
* I think the one copy of this at a time was to avoid problems if the
* trigger was set far too high and the reads then locked up the computer.
**/
static void ad7476_poll_bh_to_ring(struct work_struct *work_s)
{
struct ad7476_state *st = container_of(work_s, struct ad7476_state,
poll_work);
struct iio_dev *indio_dev = st->indio_dev;
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->private_data;
struct ad7476_state *st = iio_dev_get_devdata(indio_dev);
struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring);
s64 time_ns;
__u8 *rxbuf;
int b_sent;
/* Ensure only one copy of this function running at a time */
if (atomic_inc_return(&st->protect_ring) > 1)
return;
rxbuf = kzalloc(st->d_size, GFP_KERNEL);
if (rxbuf == NULL)
return;
return -ENOMEM;
b_sent = spi_read(st->spi, rxbuf,
st->chip_info->channel[0].scan_type.storagebits / 8);
@ -131,8 +101,10 @@ static void ad7476_poll_bh_to_ring(struct work_struct *work_s)
indio_dev->ring->access.store_to(&sw_ring->buf, rxbuf, time_ns);
done:
iio_trigger_notify_done(indio_dev->trig);
kfree(rxbuf);
atomic_dec(&st->protect_ring);
return IRQ_HANDLED;
}
int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
@ -147,9 +119,22 @@ int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
}
/* Effectively select the ring buffer implementation */
iio_ring_sw_register_funcs(&indio_dev->ring->access);
ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7476_poll_func_th);
if (ret)
indio_dev->pollfunc = kzalloc(sizeof(indio_dev->pollfunc), GFP_KERNEL);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_deallocate_sw_rb;
}
indio_dev->pollfunc->private_data = indio_dev;
indio_dev->pollfunc->thread = &ad7476_trigger_handler;
indio_dev->pollfunc->type = IRQF_ONESHOT;
indio_dev->pollfunc->name
= kasprintf(GFP_KERNEL, "%s_consumer%d",
spi_get_device_id(st->spi)->name,
indio_dev->id);
if (indio_dev->pollfunc->name == NULL) {
ret = -ENOMEM;
goto error_free_pollfunc;
}
/* Ring buffer functions - here trigger setup related */
@ -158,11 +143,11 @@ int ad7476_register_ring_funcs_and_init(struct iio_dev *indio_dev)
indio_dev->ring->predisable = &iio_triggered_ring_predisable;
indio_dev->ring->scan_timestamp = true;
INIT_WORK(&st->poll_work, &ad7476_poll_bh_to_ring);
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_RING_TRIGGERED;
return 0;
error_free_pollfunc:
kfree(indio_dev->pollfunc);
error_deallocate_sw_rb:
iio_sw_rb_free(indio_dev->ring);
error_ret:
@ -177,6 +162,7 @@ void ad7476_ring_cleanup(struct iio_dev *indio_dev)
iio_trigger_dettach_poll_func(indio_dev->trig,
indio_dev->pollfunc);
}
kfree(indio_dev->pollfunc->name);
kfree(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->ring);
}