patch "iio: magnetometer: st_magn: fix drdy line configuration for LIS3MDL" added to staging-linus

This is a note to let you know that I've just added the patch titled

iio: magnetometer: st_magn: fix drdy line configuration for LIS3MDL

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Lorenzo Bianconi <[email protected]>
Date: Tue, 29 Aug 2017 13:45:11 +0200
Subject: iio: magnetometer: st_magn: fix drdy line configuration for LIS3MDL

Data-ready line in LIS3MDL is routed to drdy pin and it is not possible to select a different INT pin. st_sensors_set_dataready_irq() assumes that if drdy int address is not exported in register map, irq trigger is not supported by the sensor and hw_irq_trigger is always false. Based on this configuration st_sensors_irq_thread does not consume generated interrupt causing an unhandled irq.
Fix this taking into account status register address in st_sensors_set_dataready_irq()

---
 drivers/iio/common/st_sensors/st_sensors_core.c | 11 ++++++++++-
 drivers/iio/magnetometer/st_magn_core.c         |  4 ++++
 2 files changed, 14 insertions(+), 1 deletion(-)

index d99bb1460fe2..02e833b14db0 100644
@@ -463,8 +463,17 @@ int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
 	u8 drdy_mask;
 	struct st_sensor_data *sdata = iio_priv(indio_dev);
 
-	if (!sdata->sensor_settings->drdy_irq.addr)
+	if (!sdata->sensor_settings->drdy_irq.addr) {
+		/*
+		 * there are some devices (e.g. LIS3MDL) where drdy line is
+		 * routed to a given pin and it is not possible to select a
+		 * different one. Take into account irq status register
+		 * to understand if irq trigger can be properly supported
+		 */
+		if (sdata->sensor_settings->drdy_irq.addr_stat_drdy)
+			sdata->hw_irq_trigger = enable;
 		return 0;
+	}
 
 	/* Enable/Disable the interrupt generator 1. */
 	if (sdata->sensor_settings->drdy_irq.ig1.en_addr > 0) {

index 703e77008652..2e36d746f5bc 100644
@@ -315,6 +315,10 @@ static const struct st_sensor_settings st_magn_sensors_settings[] = {
 				},
 			},
 		},
+		.drdy_irq = {
+			/* drdy line is routed drdy pin */
+			.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
+		},
 		.multi_read_bit = true,
 		.bootime = 2,
 	},

2.14.1