modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/drivers/iio/dac/ad5764.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 AD5764, AD5764R, AD5744, AD5744R quad-channel
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  * 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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@@ -34,9 +33,8 @@
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  * struct ad5764_chip_info - chip specific information
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  * @int_vref:	Value of the internal reference voltage in uV - 0 if external
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  *		reference voltage is used
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- * @channel	channel specification
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+ * @channels:	channel specification
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 */
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-
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 struct ad5764_chip_info {
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 	unsigned long int_vref;
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 	const struct iio_chan_spec *channels;
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@@ -47,6 +45,7 @@
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  * @spi:		spi_device
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  * @chip_info:		chip info
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  * @vref_reg:		vref supply regulators
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+ * @lock:		lock to protect the data buffer during SPI ops
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  * @data:		spi transfer buffers
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  */
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@@ -54,6 +53,7 @@
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 	struct spi_device		*spi;
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 	const struct ad5764_chip_info	*chip_info;
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 	struct regulator_bulk_data	vref_reg[2];
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+	struct mutex			lock;
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 	/*
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 	 * DMA (thus cache coherency maintenance) requires the
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@@ -127,11 +127,11 @@
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 	struct ad5764_state *st = iio_priv(indio_dev);
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 	int ret;
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-	mutex_lock(&indio_dev->mlock);
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+	mutex_lock(&st->lock);
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 	st->data[0].d32 = cpu_to_be32((reg << 16) | val);
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 	ret = spi_write(st->spi, &st->data[0].d8[1], 3);
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-	mutex_unlock(&indio_dev->mlock);
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+	mutex_unlock(&st->lock);
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 	return ret;
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 }
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@@ -152,7 +152,7 @@
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 		},
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 	};
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-	mutex_lock(&indio_dev->mlock);
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+	mutex_lock(&st->lock);
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 	st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));
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@@ -160,7 +160,7 @@
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 	if (ret >= 0)
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 		*val = be32_to_cpu(st->data[1].d32) & 0xffff;
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-	mutex_unlock(&indio_dev->mlock);
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+	mutex_unlock(&st->lock);
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 	return ret;
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 }
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@@ -289,13 +289,14 @@
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 	st->spi = spi;
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 	st->chip_info = &ad5764_chip_infos[type];
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-	indio_dev->dev.parent = &spi->dev;
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 	indio_dev->name = spi_get_device_id(spi)->name;
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 	indio_dev->info = &ad5764_info;
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 	indio_dev->modes = INDIO_DIRECT_MODE;
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 	indio_dev->num_channels = AD5764_NUM_CHANNELS;
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 	indio_dev->channels = st->chip_info->channels;
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+	mutex_init(&st->lock);
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+
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 	if (st->chip_info->int_vref == 0) {
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 		st->vref_reg[0].supply = "vrefAB";
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 		st->vref_reg[1].supply = "vrefCD";