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 <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
index 503fa61..331435a 100644 (file)
--- 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 34fc85c..009efb8 100644 (file)
--- 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 0875a7e..f0a0aae 100644 (file)
--- 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);
 }