linux-kernel - [PATCH 07/15] iio: sx9310: Use long instead of int for channel bitmaps

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Date:   Tue, 28 Jul 2020 09:12:50 -0600
From:   Daniel Campello <campello@...omium.org>
To:     LKML <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Daniel Campello <campello@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Enrico Granata <egranata@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Stephen Boyd <swboyd@...omium.org>, linux-iio@...r.kernel.org
Subject: [PATCH 07/15] iio: sx9310: Use long instead of int for channel bitmaps

Uses for_each_set_bit() macro to loop over channel bitmaps.

Signed-off-by: Daniel Campello <campello@...omium.org>
---

 drivers/iio/proximity/sx9310.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index fb5c16f2aa6b1a..2465064971d0a7 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -136,7 +136,8 @@ struct sx9310_data {
 	/* 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;
 	int channel_users[SX9310_NUM_CHANNELS];
 	unsigned int whoami;
 };
@@ -279,15 +280,16 @@ 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;
 	}
@@ -538,13 +540,13 @@ static void sx9310_push_events(struct iio_dev *indio_dev)
 		return;
 	}
 
-	for (chan = 0; chan < SX9310_NUM_CHANNELS; chan++) {
+	for_each_set_bit(chan, &data->chan_event, SX9310_NUM_CHANNELS) {
 		int dir;
 		u64 ev;
-		bool new_prox = val & BIT(chan);
+		bool new_prox;
+
+		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;
@@ -712,13 +714,13 @@ 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;
 	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);
-- 
2.28.0.rc0.142.g3c755180ce-goog