From 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 13 May 2024 10:30:14 +0000
Subject: [PATCH] modify sin led gpio
---
kernel/drivers/iio/dac/ad5764.c | 19 ++++++++++---------
1 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/kernel/drivers/iio/dac/ad5764.c b/kernel/drivers/iio/dac/ad5764.c
index 9333177..ae089b9 100644
--- a/kernel/drivers/iio/dac/ad5764.c
+++ b/kernel/drivers/iio/dac/ad5764.c
@@ -1,10 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Analog devices AD5764, AD5764R, AD5744, AD5744R quad-channel
* Digital to Analog Converters driver
*
* Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
*/
#include <linux/device.h>
@@ -34,9 +33,8 @@
* struct ad5764_chip_info - chip specific information
* @int_vref: Value of the internal reference voltage in uV - 0 if external
* reference voltage is used
- * @channel channel specification
+ * @channels: channel specification
*/
-
struct ad5764_chip_info {
unsigned long int_vref;
const struct iio_chan_spec *channels;
@@ -47,6 +45,7 @@
* @spi: spi_device
* @chip_info: chip info
* @vref_reg: vref supply regulators
+ * @lock: lock to protect the data buffer during SPI ops
* @data: spi transfer buffers
*/
@@ -54,6 +53,7 @@
struct spi_device *spi;
const struct ad5764_chip_info *chip_info;
struct regulator_bulk_data vref_reg[2];
+ struct mutex lock;
/*
* DMA (thus cache coherency maintenance) requires the
@@ -127,11 +127,11 @@
struct ad5764_state *st = iio_priv(indio_dev);
int ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->data[0].d32 = cpu_to_be32((reg << 16) | val);
ret = spi_write(st->spi, &st->data[0].d8[1], 3);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -152,7 +152,7 @@
},
};
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));
@@ -160,7 +160,7 @@
if (ret >= 0)
*val = be32_to_cpu(st->data[1].d32) & 0xffff;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -289,13 +289,14 @@
st->spi = spi;
st->chip_info = &ad5764_chip_infos[type];
- indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5764_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->num_channels = AD5764_NUM_CHANNELS;
indio_dev->channels = st->chip_info->channels;
+ mutex_init(&st->lock);
+
if (st->chip_info->int_vref == 0) {
st->vref_reg[0].supply = "vrefAB";
st->vref_reg[1].supply = "vrefCD";
--
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