From 36177c03186aa6e8ec4eb3c398df23ad5783604d Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Wed, 18 May 2011 14:41:40 +0100 Subject: [PATCH] staging:iio:adc:ad799x move to irqchip based trigger handling. Untested. Also cleared out last_timestamp as it isn't used anywhere. Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/adc/ad799x.h | 3 -- drivers/staging/iio/adc/ad799x_core.c | 3 +- drivers/staging/iio/adc/ad799x_ring.c | 61 ++++++++++++--------------- 3 files changed, 28 insertions(+), 39 deletions(-) diff --git a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h index 503fa61501f9..331435a8cacd 100644 --- a/drivers/staging/iio/adc/ad799x.h +++ b/drivers/staging/iio/adc/ad799x.h @@ -113,12 +113,9 @@ struct ad799x_state { struct iio_dev *indio_dev; struct i2c_client *client; const struct ad799x_chip_info *chip_info; - struct work_struct poll_work; - atomic_t protect_ring; size_t d_size; struct iio_trigger *trig; struct regulator *reg; - s64 last_timestamp; u16 int_vref_mv; unsigned id; char *name; diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c index 34fc85cb22dd..009efb85d0bb 100644 --- a/drivers/staging/iio/adc/ad799x_core.c +++ b/drivers/staging/iio/adc/ad799x_core.c @@ -767,7 +767,6 @@ static int __devinit ad799x_probe(struct i2c_client *client, /* this is only used for device removal purposes */ i2c_set_clientdata(client, st); - atomic_set(&st->protect_ring, 0); st->id = id->driver_data; st->chip_info = &ad799x_chip_info_tbl[st->id]; st->config = st->chip_info->default_config; @@ -797,7 +796,7 @@ static int __devinit ad799x_probe(struct i2c_client *client, st->indio_dev->dev.parent = &client->dev; st->indio_dev->attrs = st->chip_info->dev_attrs; st->indio_dev->event_attrs = st->chip_info->event_attrs; - + st->indio_dev->name = id->name; st->indio_dev->dev_data = (void *)(st); st->indio_dev->driver_module = THIS_MODULE; st->indio_dev->modes = INDIO_DIRECT_MODE; diff --git a/drivers/staging/iio/adc/ad799x_ring.c b/drivers/staging/iio/adc/ad799x_ring.c index 0875a7ef67a5..f0a0aae00412 100644 --- a/drivers/staging/iio/adc/ad799x_ring.c +++ b/drivers/staging/iio/adc/ad799x_ring.c @@ -99,34 +99,17 @@ static int ad799x_ring_preenable(struct iio_dev *indio_dev) } /** - * ad799x_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 ad799x_poll_func_th(struct iio_dev *indio_dev, s64 time) -{ - struct ad799x_state *st = indio_dev->dev_data; - - schedule_work(&st->poll_work); - - return; -} -/** - * ad799x_poll_bh_to_ring() bh of trigger launched polling to ring buffer - * @work_s: the work struct through which this was scheduled + * ad799x_trigger_handler() bh of trigger launched polling to ring buffer * * 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 ad799x_poll_bh_to_ring(struct work_struct *work_s) + +static irqreturn_t ad799x_trigger_handler(int irq, void *p) { - struct ad799x_state *st = container_of(work_s, struct ad799x_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 ad799x_state *st = iio_dev_get_devdata(indio_dev); struct iio_ring_buffer *ring = indio_dev->ring; struct iio_sw_ring_buffer *ring_sw = iio_to_sw_ring(indio_dev->ring); s64 time_ns; @@ -134,13 +117,9 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) int b_sent; u8 cmd; - /* Ensure only one copy of this function running at a time */ - if (atomic_inc_return(&st->protect_ring) > 1) - return; - rxbuf = kmalloc(st->d_size, GFP_KERNEL); if (rxbuf == NULL) - return; + return -ENOMEM; switch (st->id) { case ad7991: @@ -176,7 +155,9 @@ static void ad799x_poll_bh_to_ring(struct work_struct *work_s) ring->access.store_to(&ring_sw->buf, rxbuf, time_ns); done: kfree(rxbuf); - atomic_dec(&st->protect_ring); + if (b_sent < 0) + return b_sent; + return IRQ_HANDLED; } @@ -192,10 +173,21 @@ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev) } /* Effectively select the ring buffer implementation */ iio_ring_sw_register_funcs(&st->indio_dev->ring->access); - ret = iio_alloc_pollfunc(indio_dev, NULL, &ad799x_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 = &ad799x_trigger_handler; + indio_dev->pollfunc->type = IRQF_ONESHOT; + indio_dev->pollfunc->name = + kasprintf(GFP_KERNEL, "%s_consumer%d", indio_dev->name, + indio_dev->id); + if (indio_dev->pollfunc->name == NULL) { + ret = -ENOMEM; + goto error_free_poll_func; + } /* Ring buffer functions - here trigger setup related */ indio_dev->ring->preenable = &ad799x_ring_preenable; @@ -203,13 +195,13 @@ int ad799x_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, &ad799x_poll_bh_to_ring); - indio_dev->ring->scan_el_attrs = st->chip_info->scan_attrs; /* Flag that polled ring buffering is possible */ indio_dev->modes |= INDIO_RING_TRIGGERED; return 0; +error_free_poll_func: + kfree(indio_dev->pollfunc); error_deallocate_sw_rb: iio_sw_rb_free(indio_dev->ring); error_ret: @@ -224,6 +216,7 @@ void ad799x_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); } -- 2.20.1