From: Jonathan Cameron Date: Wed, 18 May 2011 13:41:22 +0000 (+0100) Subject: staging:iio:accel:lis3l02dq move to threaded trigger handling. X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d1dbf01128dd1d675bcbe85da49af6c9a8c56cff;p=deliverable%2Flinux.git staging:iio:accel:lis3l02dq move to threaded trigger handling. V2: Cleaned up handling of name string. Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/accel/lis3l02dq.h b/drivers/staging/iio/accel/lis3l02dq.h index 67f312d0a456..a910f2d430ff 100644 --- a/drivers/staging/iio/accel/lis3l02dq.h +++ b/drivers/staging/iio/accel/lis3l02dq.h @@ -150,7 +150,6 @@ Form of high byte dependent 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: receive buffer @@ -159,7 +158,6 @@ Form of high byte dependent 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 6c5f8a60832e..b1fb0494d756 100644 --- a/drivers/staging/iio/accel/lis3l02dq_core.c +++ b/drivers/staging/iio/accel/lis3l02dq_core.c @@ -15,15 +15,12 @@ #include #include #include -#include #include #include #include #include #include - #include -#include #include "../iio.h" #include "../sysfs.h" @@ -724,7 +721,6 @@ 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; @@ -800,8 +796,6 @@ static int lis3l02dq_remove(struct spi_device *spi) if (ret) goto err_ret; - flush_scheduled_work(); - lis3l02dq_remove_trigger(indio_dev); iio_ring_buffer_unregister(indio_dev->ring); lis3l02dq_unconfigure_ring(indio_dev); diff --git a/drivers/staging/iio/accel/lis3l02dq_ring.c b/drivers/staging/iio/accel/lis3l02dq_ring.c index 9bc2e5f21c92..d261bd612bbd 100644 --- a/drivers/staging/iio/accel/lis3l02dq_ring.c +++ b/drivers/staging/iio/accel/lis3l02dq_ring.c @@ -1,13 +1,11 @@ #include #include #include -#include #include #include #include #include #include -#include #include #include "../iio.h" @@ -28,37 +26,6 @@ static inline u16 combine_8_to_16(u8 lower, u8 upper) return _lower | (_upper << 8); } -/** - * 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; -} - /** * lis3l02dq_read_accel_from_ring() individual acceleration read from ring **/ @@ -153,15 +120,16 @@ 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 = pf->timestamp; + iio_sw_trigger_to_ring(h); + + return IRQ_HANDLED; } static int lis3l02dq_get_ring_element(struct iio_sw_ring_helper_state *h, @@ -236,7 +204,7 @@ __lis3l02dq_write_data_ready_config(struct device *dev, bool state) valold = ret | LIS3L02DQ_REG_CTRL_2_ENABLE_DATA_READY_GENERATION; ret = request_irq(st->us->irq, - lis3l02dq_data_rdy_trig_poll, + &iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING, "lis3l02dq_datardy", st->trig); if (ret) @@ -272,10 +240,10 @@ static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig, __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, @@ -298,32 +266,23 @@ 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 occurred 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); + int i; + /* If gpio still high (or high again) */ - 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; - } + /* In theory possible we will need to do this several times */ + for (i = 0; i < 5; i++) + if (gpio_get_value(irq_to_gpio(st->us->irq))) + lis3l02dq_read_all(st, NULL); + else + break; + if (i == 5) + printk(KERN_INFO + "Failed to clear the interrupt for lis3l02dq\n"); + /* irq reenabled so success! */ return 0; } @@ -334,17 +293,19 @@ 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(); - if (!st->trig) - return -ENOMEM; - - st->trig->name = kasprintf(GFP_KERNEL, - "lis3l02dq-dev%d", - indio_dev->id); - if (!st->trig->name) { + name = kasprintf(GFP_KERNEL, + "lis3l02dq-dev%d", + indio_dev->id); + if (name == NULL) { ret = -ENOMEM; - goto error_free_trig; + goto error_ret; + } + st->trig = iio_allocate_trigger_named(name); + if (!st->trig) { + ret = -ENOMEM; + goto error_free_name; } st->trig->dev.parent = &st->us->dev; @@ -355,15 +316,15 @@ int lis3l02dq_probe_trigger(struct iio_dev *indio_dev) st->trig->control_attrs = &lis3l02dq_trigger_attr_group; ret = iio_trigger_register(st->trig); if (ret) - goto error_free_trig_name; + goto error_free_trig; return 0; -error_free_trig_name: - kfree(st->trig->name); error_free_trig: iio_free_trigger(st->trig); - +error_free_name: + kfree(name); +error_ret: return ret; } @@ -380,6 +341,7 @@ 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); } @@ -459,7 +421,7 @@ 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); @@ -482,9 +444,20 @@ 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->thread = &lis3l02dq_trigger_handler; + indio_dev->pollfunc->h = &iio_pollfunc_store_time; + indio_dev->pollfunc->type = 0; + indio_dev->pollfunc->name + = kasprintf(GFP_KERNEL, "lis3l02dq_consumer%d", indio_dev->id); + indio_dev->modes |= INDIO_RING_TRIGGERED; return 0;