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Date: Tue, 28 Jul 2020 18:03:32 -0700
From: Stephen Boyd <swboyd@...omium.org>
To: Daniel Campello <campello@...omium.org>,
LKML <devicetree@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Cc: Jonathan Cameron <jic23@...nel.org>,
Daniel Campello <campello@...omium.org>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Douglas Anderson <dianders@...omium.org>,
Enrico Granata <egranata@...omium.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 07/14] iio: sx9310: Use long instead of int for channel bitmaps
Quoting Daniel Campello (2020-07-28 16:05:13)
> Uses for_each_set_bit() macro to loop over channel bitmaps.
>
> Signed-off-by: Daniel Campello <campello@...omium.org>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> ---
>
> Changes in v2:
> - Changed prox_stat to chan_prox_stat bitmap.
>
> drivers/iio/proximity/sx9310.c | 38 ++++++++++++++++++----------------
> 1 file changed, 20 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
> index 75e85dcd6b3572..1f04ab8507ec62 100644
> --- a/drivers/iio/proximity/sx9310.c
> +++ b/drivers/iio/proximity/sx9310.c
> @@ -130,14 +130,15 @@ struct sx9310_data {
> * Last reading of the proximity status for each channel.
> * We only send an event to user space when this changes.
> */
> - bool prox_stat[SX9310_NUM_CHANNELS];
> + unsigned long chan_prox_stat;
This can be DECLARE_BITMAP(chan_prox_stat, SX9310_NUM_CHANNELS)
> bool trigger_enabled;
> /* 64-bit data + 64-bit timestamp buffer */
> __be16 buffer[SX9310_NUM_CHANNELS + 4] __aligned(8);
> /* Remember enabled channels and sample rate during suspend. */
> unsigned int suspend_ctrl0;
> struct completion completion;
> - unsigned int chan_read, chan_event;
> + unsigned long chan_read;
> + unsigned long chan_event;
Same for these?
> int channel_users[SX9310_NUM_CHANNELS];
> unsigned int whoami;
> };
> @@ -280,15 +281,16 @@ static const struct regmap_config sx9310_regmap_config = {
> };
>
> static int sx9310_update_chan_en(struct sx9310_data *data,
> - unsigned int chan_read,
> - unsigned int chan_event)
> + unsigned long chan_read,
> + unsigned long chan_event)
> {
> int ret;
> + unsigned long channels = chan_read | chan_event;
>
> - if ((data->chan_read | data->chan_event) != (chan_read | chan_event)) {
> + if ((data->chan_read | data->chan_event) != channels) {
> ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL0,
> SX9310_REG_PROX_CTRL0_SENSOREN_MASK,
> - chan_read | chan_event);
> + channels);
> if (ret)
> return ret;
> }
> @@ -531,6 +533,7 @@ static void sx9310_push_events(struct iio_dev *indio_dev)
> unsigned int val, chan;
> struct sx9310_data *data = iio_priv(indio_dev);
> s64 timestamp = iio_get_time_ns(indio_dev);
> + unsigned long prox_changed;
>
> /* Read proximity state on all channels */
> ret = regmap_read(data->regmap, SX9310_REG_STAT0, &val);
> @@ -539,24 +542,23 @@ static void sx9310_push_events(struct iio_dev *indio_dev)
> return;
> }
>
> - for (chan = 0; chan < SX9310_NUM_CHANNELS; chan++) {
> + /*
> + * Only iterate over channels with changes on proximity status that have
> + * events enabled.
> + */
> + prox_changed = (data->chan_prox_stat ^ val) & data->chan_event;
I was expecting:
bitmap_xor(&prox_changed, &data->chan_prox_stat, &val, SX9310_NUM_CHANNELS);
bitmap_and(&prox_changed, &data->chan_event, SX9310_NUM_CHANNELS);
> +
> + for_each_set_bit(chan, &prox_changed, SX9310_NUM_CHANNELS) {
> int dir;
> u64 ev;
> - bool new_prox = val & BIT(chan);
> -
> - if (!(data->chan_event & BIT(chan)))
> - continue;
> - if (new_prox == data->prox_stat[chan])
> - /* No change on this channel. */
> - continue;
>
> - dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
> + dir = val & BIT(chan) ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
> ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
> IIO_EV_TYPE_THRESH, dir);
>
> iio_push_event(indio_dev, ev, timestamp);
> - data->prox_stat[chan] = new_prox;
> }
> + data->chan_prox_stat = val;
> }
>
> static irqreturn_t sx9310_irq_thread_handler(int irq, void *private)
> @@ -713,13 +715,13 @@ static irqreturn_t sx9310_trigger_handler(int irq, void *private)
> static int sx9310_buffer_preenable(struct iio_dev *indio_dev)
> {
> struct sx9310_data *data = iio_priv(indio_dev);
> - unsigned int channels = 0;
> + unsigned long channels = 0;
Use DECLARE_BITMAP(channels, SX9310_NUM_CHANNELS)?
> int bit, ret;
>
> mutex_lock(&data->mutex);
> for_each_set_bit(bit, indio_dev->active_scan_mask,
> indio_dev->masklength)
> - channels |= BIT(indio_dev->channels[bit].channel);
> + __set_bit(indio_dev->channels[bit].channel, &channels);
>
> ret = sx9310_update_chan_en(data, channels, data->chan_event);
> mutex_unlock(&data->mutex);
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