staging: iio: adc: ad7192: use driver private lock to protect hardware state changes (2db82e32) · Commits · 戴 / test

drivers/staging/iio/adc/ad7192.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -162,6 +162,7 @@ struct ad7192_state {
		u32 scale_avail[8][2];
		u8 gpocon;
		u8 devid;
		struct mutex lock; /* protect sensor state */

		struct ad_sigma_delta sd;
		};
		@@ -461,10 +462,10 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
		case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_VOLTAGE:
		mutex_lock(&indio_dev->mlock);
		mutex_lock(&st->lock);
		*val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
		*val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
		mutex_unlock(&indio_dev->mlock);
		mutex_unlock(&st->lock);
		return IIO_VAL_INT_PLUS_NANO;
		case IIO_TEMP:
		*val = 0;
		@@ -508,6 +509,7 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
		switch (mask) {
		case IIO_CHAN_INFO_SCALE:
		ret = -EINVAL;
		mutex_lock(&st->lock);
		for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
		if (val2 == st->scale_avail[i][1]) {
		ret = 0;
		@@ -521,6 +523,7 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
		ad7192_calibrate_all(st);
		break;
		}
		mutex_unlock(&st->lock);
		break;
		case IIO_CHAN_INFO_SAMP_FREQ:
		if (!val) {
		@@ -630,6 +633,8 @@ static int ad7192_probe(struct spi_device *spi)

		st = iio_priv(indio_dev);

		mutex_init(&st->lock);

		st->avdd = devm_regulator_get(&spi->dev, "avdd");
		if (IS_ERR(st->avdd))
		return PTR_ERR(st->avdd);