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/ad5421.c | 25 ++++++++++++++-----------
1 files changed, 14 insertions(+), 11 deletions(-)
diff --git a/kernel/drivers/iio/dac/ad5421.c b/kernel/drivers/iio/dac/ad5421.c
index 8e9633d..eedf661 100644
--- a/kernel/drivers/iio/dac/ad5421.c
+++ b/kernel/drivers/iio/dac/ad5421.c
@@ -1,9 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* AD5421 Digital to analog converters driver
*
* Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
*/
#include <linux/device.h>
@@ -63,12 +62,14 @@
* @current_range: current range which the device is configured for
* @data: spi transfer buffers
* @fault_mask: software masking of events
+ * @lock: lock to protect the data buffer during SPI ops
*/
struct ad5421_state {
struct spi_device *spi;
unsigned int ctrl;
enum ad5421_current_range current_range;
unsigned int fault_mask;
+ struct mutex lock;
/*
* DMA (thus cache coherency maintenance) requires the
@@ -143,11 +144,12 @@
static int ad5421_write(struct iio_dev *indio_dev, unsigned int reg,
unsigned int val)
{
+ struct ad5421_state *st = iio_priv(indio_dev);
int ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
ret = ad5421_write_unlocked(indio_dev, reg, val);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -167,7 +169,7 @@
},
};
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));
@@ -175,7 +177,7 @@
if (ret >= 0)
ret = be32_to_cpu(st->data[1].d32) & 0xffff;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -186,14 +188,14 @@
struct ad5421_state *st = iio_priv(indio_dev);
unsigned int ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
st->ctrl &= ~clr;
st->ctrl |= set;
ret = ad5421_write_unlocked(indio_dev, AD5421_REG_CTRL, st->ctrl);
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -401,12 +403,12 @@
return -EINVAL;
}
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
if (state)
st->fault_mask |= mask;
else
st->fault_mask &= ~mask;
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return 0;
}
@@ -485,13 +487,14 @@
st->spi = spi;
- indio_dev->dev.parent = &spi->dev;
indio_dev->name = "ad5421";
indio_dev->info = &ad5421_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ad5421_channels;
indio_dev->num_channels = ARRAY_SIZE(ad5421_channels);
+ mutex_init(&st->lock);
+
st->ctrl = AD5421_CTRL_WATCHDOG_DISABLE |
AD5421_CTRL_AUTO_FAULT_READBACK;
--
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