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path: root/drivers/iio/frequency/adf4350.c
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Diffstat (limited to 'drivers/iio/frequency/adf4350.c')
-rw-r--r--drivers/iio/frequency/adf4350.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index 409c9c47161e..82c050a3899d 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -48,6 +48,13 @@ struct adf4350_state {
unsigned long regs_hw[6];
unsigned long long freq_req;
/*
+ * Lock to protect the state of the device from potential concurrent
+ * writes. The device is configured via a sequence of SPI writes,
+ * and this lock is meant to prevent the start of another sequence
+ * before another one has finished.
+ */
+ struct mutex lock;
+ /*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
@@ -99,7 +106,7 @@ static int adf4350_reg_access(struct iio_dev *indio_dev,
if (reg > ADF4350_REG5)
return -EINVAL;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
if (readval == NULL) {
st->regs[reg] = writeval & ~(BIT(0) | BIT(1) | BIT(2));
ret = adf4350_sync_config(st);
@@ -107,7 +114,7 @@ static int adf4350_reg_access(struct iio_dev *indio_dev,
*readval = st->regs_hw[reg];
ret = 0;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret;
}
@@ -254,7 +261,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
if (ret)
return ret;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
switch ((u32)private) {
case ADF4350_FREQ:
ret = adf4350_set_freq(st, readin);
@@ -295,7 +302,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
default:
ret = -EINVAL;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret ? ret : len;
}
@@ -309,7 +316,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
unsigned long long val;
int ret = 0;
- mutex_lock(&indio_dev->mlock);
+ mutex_lock(&st->lock);
switch ((u32)private) {
case ADF4350_FREQ:
val = (u64)((st->r0_int * st->r1_mod) + st->r0_fract) *
@@ -338,7 +345,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
ret = -EINVAL;
val = 0;
}
- mutex_unlock(&indio_dev->mlock);
+ mutex_unlock(&st->lock);
return ret < 0 ? ret : sprintf(buf, "%llu\n", val);
}
@@ -539,6 +546,8 @@ static int adf4350_probe(struct spi_device *spi)
indio_dev->channels = &adf4350_chan;
indio_dev->num_channels = 1;
+ mutex_init(&st->lock);
+
st->chspc = pdata->channel_spacing;
if (clk) {
st->clk = clk;