Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758144Ab1CaOx3 (ORCPT ); Thu, 31 Mar 2011 10:53:29 -0400 Received: from ppsw-50.csi.cam.ac.uk ([131.111.8.150]:57444 "EHLO ppsw-50.csi.cam.ac.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758069Ab1CaOwz (ORCPT ); Thu, 31 Mar 2011 10:52:55 -0400 X-Cam-AntiVirus: no malware found X-Cam-SpamDetails: not scanned X-Cam-ScannerInfo: http://www.cam.ac.uk/cs/email/scanner/ From: Jonathan Cameron To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: arnd@arndb.de, tglx@linutronix.de, Jonathan Cameron Subject: [PATCH 19/21] staging:iio:lis3l02dq move to threaded trigger handling. Date: Thu, 31 Mar 2011 15:54:13 +0100 Message-Id: <1301583255-28468-20-git-send-email-jic23@cam.ac.uk> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <1301583255-28468-1-git-send-email-jic23@cam.ac.uk> References: <1301583255-28468-1-git-send-email-jic23@cam.ac.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8054 Lines: 227 Signed-off-by: Jonathan Cameron --- drivers/staging/iio/accel/lis3l02dq.h | 2 - drivers/staging/iio/accel/lis3l02dq_core.c | 2 - drivers/staging/iio/accel/lis3l02dq_ring.c | 96 ++++++++++----------------- 3 files changed, 36 insertions(+), 64 deletions(-) diff --git a/drivers/staging/iio/accel/lis3l02dq.h b/drivers/staging/iio/accel/lis3l02dq.h index 6d73325..e7f64bd 100644 --- a/drivers/staging/iio/accel/lis3l02dq.h +++ b/drivers/staging/iio/accel/lis3l02dq.h @@ -150,7 +150,6 @@ Form of high byte dependant on justification set in ctrl reg */ * struct lis3l02dq_state - device instance specific data * @helper: data and func pointer allowing generic functions * @us: actual spi_device - * @inter: used to check if new interrupt has been triggered * @trig: data ready trigger registered with iio * @tx: transmit buffer * @rx: recieve buffer @@ -159,7 +158,6 @@ Form of high byte dependant on justification set in ctrl reg */ struct lis3l02dq_state { struct iio_sw_ring_helper_state help; struct spi_device *us; - bool inter; struct iio_trigger *trig; u8 *tx; u8 *rx; diff --git a/drivers/staging/iio/accel/lis3l02dq_core.c b/drivers/staging/iio/accel/lis3l02dq_core.c index 2bded87..46f0633 100644 --- a/drivers/staging/iio/accel/lis3l02dq_core.c +++ b/drivers/staging/iio/accel/lis3l02dq_core.c @@ -15,7 +15,6 @@ #include #include #include -#include #include #include #include @@ -726,7 +725,6 @@ static int __devinit lis3l02dq_probe(struct spi_device *spi) } if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) { - st->inter = 0; ret = lis3l02dq_probe_trigger(st->help.indio_dev); if (ret) goto error_uninitialize_ring; diff --git a/drivers/staging/iio/accel/lis3l02dq_ring.c b/drivers/staging/iio/accel/lis3l02dq_ring.c index 9b15cad..04a0265 100644 --- a/drivers/staging/iio/accel/lis3l02dq_ring.c +++ b/drivers/staging/iio/accel/lis3l02dq_ring.c @@ -29,31 +29,10 @@ static inline u16 combine_8_to_16(u8 lower, u8 upper) } /** - * lis3l02dq_poll_func_th() top half interrupt handler called by trigger - * @private_data: iio_dev - **/ -static void lis3l02dq_poll_func_th(struct iio_dev *indio_dev, s64 time) -{ - struct iio_sw_ring_helper_state *h - = iio_dev_get_devdata(indio_dev); - struct lis3l02dq_state *st = lis3l02dq_h_to_s(h); - /* in this case we need to slightly extend the helper function */ - iio_sw_poll_func_th(indio_dev, time); - - /* Indicate that this interrupt is being handled */ - /* Technically this is trigger related, but without this - * handler running there is currently now way for the interrupt - * to clear. - */ - st->inter = 1; -} - -/** * lis3l02dq_data_rdy_trig_poll() the event handler for the data rdy trig **/ static irqreturn_t lis3l02dq_data_rdy_trig_poll(int irq, void *private) { - disable_irq_nosync(irq); iio_trigger_poll(private, iio_get_time_ns()); return IRQ_HANDLED; @@ -153,15 +132,16 @@ static int lis3l02dq_read_all(struct lis3l02dq_state *st, u8 *rx_array) return ret; } -static void lis3l02dq_trigger_bh_to_ring(struct work_struct *work_s) +static irqreturn_t lis3l02dq_trigger_handler(int irq, void *p) { - struct iio_sw_ring_helper_state *h - = container_of(work_s, struct iio_sw_ring_helper_state, - work_trigger_to_ring); - struct lis3l02dq_state *st = lis3l02dq_h_to_s(h); + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->private_data; + struct iio_sw_ring_helper_state *h = iio_dev_get_devdata(indio_dev); - st->inter = 0; - iio_sw_trigger_bh_to_ring(work_s); + h->last_timestamp = iio_get_time_ns(); + iio_sw_trigger_to_ring(h); + + return IRQ_HANDLED; } static int lis3l02dq_get_ring_element(struct iio_sw_ring_helper_state *h, @@ -271,10 +251,10 @@ static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig, u8 t; __lis3l02dq_write_data_ready_config(&st->help.indio_dev->dev, state); if (state == false) { - /* possible quirk with handler currently worked around - by ensuring the work queue is empty */ - flush_scheduled_work(); - /* Clear any outstanding ready events */ + /* + * A possible quirk with teh handler is currently worked around + * by ensuring outstanding read events are cleared. + */ ret = lis3l02dq_read_all(st, NULL); } lis3l02dq_spi_read_reg_8(st->help.indio_dev, @@ -297,32 +277,15 @@ static const struct attribute_group lis3l02dq_trigger_attr_group = { /** * lis3l02dq_trig_try_reen() try renabling irq for data rdy trigger * @trig: the datardy trigger - * - * As the trigger may occur on any data element being updated it is - * really rather likely to occur during the read from the previous - * trigger event. The only way to discover if this has occured on - * boards not supporting level interrupts is to take a look at the line. - * If it is indicating another interrupt and we don't seem to have a - * handler looking at it, then we need to notify the core that we need - * to tell the triggering core to try reading all these again. - **/ + */ static int lis3l02dq_trig_try_reen(struct iio_trigger *trig) { struct lis3l02dq_state *st = trig->private_data; - enable_irq(st->us->irq); /* If gpio still high (or high again) */ + /* In theory possible we will need to do this several times */ if (gpio_get_value(irq_to_gpio(st->us->irq))) - if (st->inter == 0) { - /* already interrupt handler dealing with it */ - disable_irq_nosync(st->us->irq); - if (st->inter == 1) { - /* interrupt handler snuck in between test - * and disable */ - enable_irq(st->us->irq); - return 0; - } - return -EAGAIN; - } + lis3l02dq_read_all(st, NULL); + /* irq reenabled so success! */ return 0; } @@ -333,14 +296,16 @@ int lis3l02dq_probe_trigger(struct iio_dev *indio_dev) struct iio_sw_ring_helper_state *h = iio_dev_get_devdata(indio_dev); struct lis3l02dq_state *st = lis3l02dq_h_to_s(h); + char *name; - st->trig = iio_allocate_trigger(); + name = kasprintf(GFP_KERNEL, + "lis3l02dq-dev%d", + indio_dev->id); + st->trig = iio_allocate_trigger_named(name); if (!st->trig) return -ENOMEM; - st->trig->name = kasprintf(GFP_KERNEL, - "lis3l02dq-dev%d", - indio_dev->id); + st->trig->name = name; if (!st->trig->name) { ret = -ENOMEM; goto error_free_trig; @@ -379,6 +344,7 @@ void lis3l02dq_remove_trigger(struct iio_dev *indio_dev) void lis3l02dq_unconfigure_ring(struct iio_dev *indio_dev) { + kfree(indio_dev->pollfunc->name); kfree(indio_dev->pollfunc); lis3l02dq_free_buf(indio_dev->ring); } @@ -458,7 +424,7 @@ int lis3l02dq_configure_ring(struct iio_dev *indio_dev) int ret; struct iio_sw_ring_helper_state *h = iio_dev_get_devdata(indio_dev); struct iio_ring_buffer *ring; - INIT_WORK(&h->work_trigger_to_ring, lis3l02dq_trigger_bh_to_ring); + h->get_ring_element = &lis3l02dq_get_ring_element; ring = lis3l02dq_alloc_buf(indio_dev); @@ -481,9 +447,19 @@ int lis3l02dq_configure_ring(struct iio_dev *indio_dev) iio_scan_mask_set(ring, 1); iio_scan_mask_set(ring, 2); - ret = iio_alloc_pollfunc(indio_dev, NULL, &lis3l02dq_poll_func_th); - if (ret) + /* Functions are NULL as we set handler below */ + indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL); + + if (indio_dev->pollfunc == NULL) { + ret = -ENOMEM; goto error_iio_sw_rb_free; + } + indio_dev->pollfunc->private_data = indio_dev; + indio_dev->pollfunc->handler = &lis3l02dq_trigger_handler; + indio_dev->pollfunc->type = IRQF_ONESHOT; + indio_dev->pollfunc->name + = kasprintf(GFP_KERNEL, "lis3l02dq_consumer%d", indio_dev->id); + indio_dev->modes |= INDIO_RING_TRIGGERED; return 0; -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/