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iio: accel: bma220: add i2c watchdog feature

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Sometimes the sensor gets stuck and enters a condition in which it pulls
SDA low, thus making the entire i2c bus unusable.
This problem is mitigated by activating a 1ms watchdog implemented in
the sensor.

Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Petre Rodan 2025-10-05 16:12:24 +03:00 committed by Jonathan Cameron
parent 7a23e6d922
commit 3499375209
1 changed files with 14 additions and 0 deletions
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14
drivers/iio/accel/bma220_core.c
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@ -11,6 +11,7 @@
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
@ -356,6 +357,12 @@ static int bma220_power(struct bma220_data *data, bool up)
return -EBUSY;
}
static int bma220_set_wdt(struct bma220_data *data, const u8 val)
{
return regmap_update_bits(data->regmap, BMA220_REG_WDT, BMA220_WDT_MASK,
FIELD_PREP(BMA220_WDT_MASK, val));
}
static int bma220_init(struct device *dev, struct bma220_data *data)
{
int ret;
@ -384,6 +391,13 @@ static int bma220_init(struct device *dev, struct bma220_data *data)
if (ret)
return dev_err_probe(dev, ret, "Failed to soft reset chip\n");
if (i2c_verify_client(dev)) {
ret = bma220_set_wdt(data, BMA220_WDT_1MS);
if (ret)
return dev_err_probe(dev, ret,
"Failed to set i2c watchdog\n");
}
return 0;
}