linux-kernel - [PATCH 5.7 256/477] iio: light: gp2ap002: Take runtime PM reference on light read

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Message-Id: <20200623195419.674080567@linuxfoundation.org>
Date:   Tue, 23 Jun 2020 21:54:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jonathan Bakker <xc-racer2@...e.ca>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 256/477] iio: light: gp2ap002: Take runtime PM reference on light read

From: Jonathan Bakker <xc-racer2@...e.ca>

[ Upstream commit f6dbf83c17cb223ceabd7c42d441414f3e0e8a86 ]

The light sensor needs the regulators to be enabled which means
the runtime PM needs to be on.  This only happened when the
proximity part of the chip was enabled.

As fallout from this change, only report changes to the prox
state in the interrupt handler when it is explicitly enabled.

Fixes: 97d642e23037 ("iio: light: Add a driver for Sharp GP2AP002x00F")
Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/light/gp2ap002.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/light/gp2ap002.c b/drivers/iio/light/gp2ap002.c
index b7ef16b28280d..7a2679bdc987a 100644
--- a/drivers/iio/light/gp2ap002.c
+++ b/drivers/iio/light/gp2ap002.c
@@ -158,6 +158,9 @@ static irqreturn_t gp2ap002_prox_irq(int irq, void *d)
 	int val;
 	int ret;
 
+	if (!gp2ap002->enabled)
+		goto err_retrig;
+
 	ret = regmap_read(gp2ap002->map, GP2AP002_PROX, &val);
 	if (ret) {
 		dev_err(gp2ap002->dev, "error reading proximity\n");
@@ -247,6 +250,8 @@ static int gp2ap002_read_raw(struct iio_dev *indio_dev,
 	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
 	int ret;
 
+	pm_runtime_get_sync(gp2ap002->dev);
+
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		switch (chan->type) {
@@ -255,13 +260,21 @@ static int gp2ap002_read_raw(struct iio_dev *indio_dev,
 			if (ret < 0)
 				return ret;
 			*val = ret;
-			return IIO_VAL_INT;
+			ret = IIO_VAL_INT;
+			goto out;
 		default:
-			return -EINVAL;
+			ret = -EINVAL;
+			goto out;
 		}
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
 	}
+
+out:
+	pm_runtime_mark_last_busy(gp2ap002->dev);
+	pm_runtime_put_autosuspend(gp2ap002->dev);
+
+	return ret;
 }
 
 static int gp2ap002_init(struct gp2ap002 *gp2ap002)
-- 
2.25.1