disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/iio/dac/ad5380.c
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@@ -1,10 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Analog devices AD5380, AD5381, AD5382, AD5383, AD5390, AD5391, AD5392
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  * multi-channel Digital to Analog Converters driver
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  *
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  * Copyright 2011 Analog Devices Inc.
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- *
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- * Licensed under the GPL-2.
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  */
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 #include <linux/device.h>
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@@ -52,6 +51,7 @@
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  * @vref_reg:		vref supply regulator
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  * @vref:		actual reference voltage used in uA
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  * @pwr_down:		whether the chip is currently in power down mode
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+ * @lock:		lock to protect the data buffer during regmap ops
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  */
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 struct ad5380_state {
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@@ -60,6 +60,7 @@
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 	struct regulator		*vref_reg;
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 	int				vref;
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 	bool				pwr_down;
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+	struct mutex			lock;
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 };
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 enum ad5380_type {
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@@ -99,7 +100,7 @@
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 	if (ret)
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 		return ret;
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-	mutex_lock(&indio_dev->mlock);
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+	mutex_lock(&st->lock);
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 	if (pwr_down)
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 		ret = regmap_write(st->regmap, AD5380_REG_SF_PWR_DOWN, 0);
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@@ -108,7 +109,7 @@
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 	st->pwr_down = pwr_down;
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-	mutex_unlock(&indio_dev->mlock);
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+	mutex_unlock(&st->lock);
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 	return ret ? ret : len;
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 }
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@@ -239,7 +240,7 @@
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 	.write_raw = ad5380_write_raw,
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 };
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-static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
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+static const struct iio_chan_spec_ext_info ad5380_ext_info[] = {
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 	{
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 		.name = "powerdown",
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 		.read = ad5380_read_dac_powerdown,
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@@ -385,12 +386,13 @@
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 	st->chip_info = &ad5380_chip_info_tbl[type];
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 	st->regmap = regmap;
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-	indio_dev->dev.parent = dev;
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 	indio_dev->name = name;
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 	indio_dev->info = &ad5380_info;
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 	indio_dev->modes = INDIO_DIRECT_MODE;
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 	indio_dev->num_channels = st->chip_info->num_channels;
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+	mutex_init(&st->lock);
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+
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 	ret = ad5380_alloc_channels(indio_dev);
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 	if (ret) {
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 		dev_err(dev, "Failed to allocate channel spec: %d\n", ret);