linux-kernel - [PATCH v2] iio: imu/mpu6050: support dual-edge IRQ

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Date:   Mon, 06 Jan 2020 12:17:54 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] iio: imu/mpu6050: support dual-edge IRQ

Make mpu6050 usable on platforms which provide only any-edge interrupts.
This also covers shared interrupt case.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>

---
v2:
   just remove the dev_warn() message

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 2 +-
 drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 0686e41bb8a1..b3d138091f89 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -1241,7 +1241,7 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 	irq_type = irqd_get_trigger_type(desc);
 	if (!irq_type)
 		irq_type = IRQF_TRIGGER_RISING;
-	if (irq_type == IRQF_TRIGGER_RISING)
+	if (irq_type & IRQF_TRIGGER_RISING)	// rising or both-edge
 		st->irq_mask = INV_MPU6050_ACTIVE_HIGH;
 	else if (irq_type == IRQF_TRIGGER_FALLING)
 		st->irq_mask = INV_MPU6050_ACTIVE_LOW;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
index 10d16ec5104b..a4dc2c4a3ca5 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
@@ -183,11 +183,8 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)
 			"failed to ack interrupt\n");
 		goto flush_fifo;
 	}
-	if (!(int_status & INV_MPU6050_BIT_RAW_DATA_RDY_INT)) {
-		dev_warn(regmap_get_device(st->map),
-			"spurious interrupt with status 0x%x\n", int_status);
+	if (!(int_status & INV_MPU6050_BIT_RAW_DATA_RDY_INT))
 		goto end_session;
-	}
 
 	if (!(st->chip_config.accl_fifo_enable |
 		st->chip_config.gyro_fifo_enable |
-- 
2.20.1