diff options
Diffstat (limited to 'drivers/staging/iio/adc/max1363_ring.c')
-rw-r--r-- | drivers/staging/iio/adc/max1363_ring.c | 66 |
1 files changed, 26 insertions, 40 deletions
diff --git a/drivers/staging/iio/adc/max1363_ring.c b/drivers/staging/iio/adc/max1363_ring.c index 405f729d76ff..a387a9986388 100644 --- a/drivers/staging/iio/adc/max1363_ring.c +++ b/drivers/staging/iio/adc/max1363_ring.c @@ -9,8 +9,6 @@ */ #include <linux/interrupt.h> -#include <linux/gpio.h> -#include <linux/workqueue.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/kernel.h> @@ -105,36 +103,11 @@ static int max1363_ring_preenable(struct iio_dev *indio_dev) return 0; } - -/** - * max1363_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 max1363_poll_func_th(struct iio_dev *indio_dev, s64 time) +static irqreturn_t max1363_trigger_handler(int irq, void *p) { + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->private_data; struct max1363_state *st = iio_priv(indio_dev); - - schedule_work(&st->poll_work); - - return; -} -/** - * max1363_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 max1363_poll_bh_to_ring(struct work_struct *work_s) -{ - struct max1363_state *st = container_of(work_s, struct max1363_state, - poll_work); - struct iio_dev *indio_dev = iio_priv_to_dev(st); struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring); s64 time_ns; __u8 *rxbuf; @@ -150,20 +123,16 @@ static void max1363_poll_bh_to_ring(struct work_struct *work_s) if (d_size % sizeof(s64)) d_size += sizeof(s64) - (d_size % sizeof(s64)); - /* Ensure only one copy of this function running at a time */ - if (atomic_inc_return(&st->protect_ring) > 1) - return; - /* Monitor mode prevents reading. Whilst not currently implemented * might as well have this test in here in the meantime as it does * no harm. */ if (numvals == 0) - return; + return IRQ_HANDLED; rxbuf = kmalloc(d_size, GFP_KERNEL); if (rxbuf == NULL) - return; + return -ENOMEM; if (st->chip_info->bits != 8) b_sent = i2c_master_recv(st->client, rxbuf, numvals*2); else @@ -177,8 +146,10 @@ static void max1363_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; } @@ -194,19 +165,33 @@ int max1363_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, &max1363_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 = &max1363_trigger_handler; + indio_dev->pollfunc->type = IRQF_ONESHOT; + indio_dev->pollfunc->name = + kasprintf(GFP_KERNEL, "%s_consumer%d", + st->client->name, indio_dev->id); + if (indio_dev->pollfunc->name == NULL) { + ret = -ENOMEM; + goto error_free_pollfunc; + } /* Ring buffer functions - here trigger setup related */ indio_dev->ring->postenable = &iio_triggered_ring_postenable; indio_dev->ring->preenable = &max1363_ring_preenable; indio_dev->ring->predisable = &iio_triggered_ring_predisable; - INIT_WORK(&st->poll_work, &max1363_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: @@ -221,6 +206,7 @@ void max1363_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); } |