Merge tag 'iio-for-4.12c' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Third set of new device support, cleanups and features for IIO in the 4.12 cycle

Somewhat dominated in patch numbers of last of the outreachy application
window related patches (they are still coming, despite window being closed
which is good to see!)

Good set of new drivers as well.

New device support
* ASPEED ADC
  - new driver
* cpcap PMIC ADC
  - new driver
* hid-humidity
  - driver for HID compatible humidity sensors.
* ltc2497 ADC
  - new driver
* mpu6050
  - bring bindings up to date and add trivial support for 9250
* rockchip-saradc
  - update bindings to cover rk3328
* vl6180 light, proximity and time of flight sensor.
  - new driver

Features
* meson-saradc
  - add calibration

Cleanup and minor fixes
* ad5504
  - constify attribute_group structure
  - drop casting of void *
* ad7150
  - replace some shifts of 1 by BIT macro usage
* ad7152
  - blank lines between function definitions
* ad7280a
  - octal permissions.
* ad7606
  - replace use of core mlock mutex with a local lock
* ad7746
  - replace some shifts of 1 by BIT macro usage
  - function parameter alignment
  - drop some excessive brackets (introduced in last pull request)
* ad7753
  - white space cleanup
* ad7754
  - includes in alphabetical order and groupped appropriately.
  - change from missuse of internal mlock mutex to using the buffer lock to
  also protect values during frequency update.
* ad779x
  - constify attribute_group structures
* ad9832
  - octal permissions
* adis16060
  - remove use of core mlock mutex in favour of adding a local
  _spi_write_then_read which can use the local buffer protection lock.
  - fix naming of above function.
* adis16203
  - remove locking during reads of calibbias that doesn't protect anything
  not protected elsewhere.
* adis16209
  - remove unnecessary braces in single statement if
* adis16240
  - remove unnecessary braces in single statement if
* adt7136
  - drop excess blank lines and put some in between functions.
* ams-iaq
  - replace comma with semi colon. Not actual bug, just unusual syntax.
* apds9960
  - constify attribute group structure
* as3935
  - constify attribute group structure
* bm1750
  - constify attribute group structure
* cros_ec
  - devm version of triggered buffer setup to simplify code.
* exynos
  - drop casting of void *
* hdc100x
  - constify attribute_group structure
* hid-accel
  - fix wrong scale for newly introduced gravity sensor.
* hts221
  - drop casting of void *
* hx711
  - constify attribute_group structure
* imx7d_adc
  - drop casting of void *
* lm35333
  - constify attribute_group structure
* lsm6dsx
  - drop casting of void *
  - hold ODR configuration until enabling to avoid a race condition.
* max1027
  - drop casting of void *
* max11100
  - fix a comma where semicolon was intended (no actual bug, just odd)
* max1363
  - constify attribute_group structure
* ms sensors
  - drop casting of void *
* rockchip_saradc
  - drop casting of void *
* sun4i-gpadc
  - fix missing dependency on THERMAL or presence of stubs (issue only
  introduced in pervious set)
  - drop casting of void *
* tsl2x7x
  - fix wrong standard deviation calc.  Note these aren't actually used for
  anything at the moment so bug didn't really matter.
  - constify attribute group structure.
* vf610adc
  - drop casting of void *
* vz89x
  - replace comma with semicolon. Not actual bug, just odd syntax.
* zpa2326
  - drop casting of void *

15 files changed, 76 insertions, 88 deletions

diff --git a/drivers/staging/iio/accel/adis16203.c b/drivers/staging/iio/accel/adis16203.c
index b59755aedd8b..faa2869b5431 100644
--- a/drivers/staging/iio/accel/adis16203.c
+++ b/drivers/staging/iio/accel/adis16203.c
@@ -203,17 +203,14 @@ static int adis16203_read_raw(struct iio_dev *indio_dev,
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_CALIBBIAS:
 		bits = 14;
-		mutex_lock(&indio_dev->mlock);
 		addr = adis16203_addresses[chan->scan_index];
 		ret = adis_read_reg_16(st, addr, &val16);
 		if (ret) {
-			mutex_unlock(&indio_dev->mlock);
 			return ret;
 		}
 		val16 &= (1 << bits) - 1;
 		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 		*val = val16;
-		mutex_unlock(&indio_dev->mlock);
 		return IIO_VAL_INT;
 	default:
 		return -EINVAL;
diff --git a/drivers/staging/iio/accel/adis16209.c b/drivers/staging/iio/accel/adis16209.c
index 52fa2e0511be..8485c024e3f5 100644
--- a/drivers/staging/iio/accel/adis16209.c
+++ b/drivers/staging/iio/accel/adis16209.c
@@ -255,9 +255,8 @@ static int adis16209_read_raw(struct iio_dev *indio_dev,
 		}
 		addr = adis16209_addresses[chan->scan_index][0];
 		ret = adis_read_reg_16(st, addr, &val16);
-		if (ret) {
+		if (ret)
 			return ret;
-		}
 		val16 &= (1 << bits) - 1;
 		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 		*val = val16;
diff --git a/drivers/staging/iio/accel/adis16240.c b/drivers/staging/iio/accel/adis16240.c
index 6e3c95c9c3f6..109cd94b5ac3 100644
--- a/drivers/staging/iio/accel/adis16240.c
+++ b/drivers/staging/iio/accel/adis16240.c
@@ -290,9 +290,8 @@ static int adis16240_read_raw(struct iio_dev *indio_dev,
 		bits = 10;
 		addr = adis16240_addresses[chan->scan_index][0];
 		ret = adis_read_reg_16(st, addr, &val16);
-		if (ret) {
+		if (ret)
 			return ret;
-		}
 		val16 &= (1 << bits) - 1;
 		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 		*val = val16;
@@ -301,9 +300,8 @@ static int adis16240_read_raw(struct iio_dev *indio_dev,
 		bits = 10;
 		addr = adis16240_addresses[chan->scan_index][1];
 		ret = adis_read_reg_16(st, addr, &val16);
-		if (ret) {
+		if (ret)
 			return ret;
-		}
 		val16 &= (1 << bits) - 1;
 		val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
 		*val = val16;
diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
index 6a85e284c8a4..d5ab83f0236d 100644
--- a/drivers/staging/iio/adc/ad7280a.c
+++ b/drivers/staging/iio/adc/ad7280a.c
@@ -560,7 +560,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
 			st->iio_attr[cnt].address =
 				AD7280A_DEVADDR(dev) << 8 | ch;
 			st->iio_attr[cnt].dev_attr.attr.mode =
-				S_IWUSR | S_IRUGO;
+				0644;
 			st->iio_attr[cnt].dev_attr.show =
 				ad7280_show_balance_sw;
 			st->iio_attr[cnt].dev_attr.store =
@@ -577,7 +577,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
 				AD7280A_DEVADDR(dev) << 8 |
 				(AD7280A_CB1_TIMER + ch);
 			st->iio_attr[cnt].dev_attr.attr.mode =
-				S_IWUSR | S_IRUGO;
+				0644;
 			st->iio_attr[cnt].dev_attr.show =
 				ad7280_show_balance_timer;
 			st->iio_attr[cnt].dev_attr.store =
@@ -746,26 +746,26 @@ out:
 
 static IIO_DEVICE_ATTR_NAMED(in_thresh_low_value,
 		in_voltage-voltage_thresh_low_value,
-		S_IRUGO | S_IWUSR,
+		0644,
 		ad7280_read_channel_config,
 		ad7280_write_channel_config,
 		AD7280A_CELL_UNDERVOLTAGE);
 
 static IIO_DEVICE_ATTR_NAMED(in_thresh_high_value,
 		in_voltage-voltage_thresh_high_value,
-		S_IRUGO | S_IWUSR,
+		0644,
 		ad7280_read_channel_config,
 		ad7280_write_channel_config,
 		AD7280A_CELL_OVERVOLTAGE);
 
 static IIO_DEVICE_ATTR(in_temp_thresh_low_value,
-		S_IRUGO | S_IWUSR,
+		0644,
 		ad7280_read_channel_config,
 		ad7280_write_channel_config,
 		AD7280A_AUX_ADC_UNDERVOLTAGE);
 
 static IIO_DEVICE_ATTR(in_temp_thresh_high_value,
-		S_IRUGO | S_IWUSR,
+		0644,
 		ad7280_read_channel_config,
 		ad7280_write_channel_config,
 		AD7280A_AUX_ADC_OVERVOLTAGE);
diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
index 9dbfa64b1e53..18f5f139117e 100644
--- a/drivers/staging/iio/adc/ad7606.c
+++ b/drivers/staging/iio/adc/ad7606.c
@@ -208,7 +208,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
 	switch (mask) {
 	case IIO_CHAN_INFO_SCALE:
 		ret = -EINVAL;
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(&st->lock);
 		for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
 			if (val2 == scale_avail[i][1]) {
 				gpiod_set_value(st->gpio_range, i);
@@ -217,7 +217,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
 				ret = 0;
 				break;
 			}
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(&st->lock);
 
 		return ret;
 	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
@@ -231,11 +231,11 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
 		values[1] = (ret >> 1) & 1;
 		values[2] = (ret >> 2) & 1;
 
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(&st->lock);
 		gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
 				      values);
 		st->oversampling = val;
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(&st->lock);
 
 		return 0;
 	default:
@@ -413,6 +413,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
 	st = iio_priv(indio_dev);
 
 	st->dev = dev;
+	mutex_init(&st->lock);
 	st->bops = bops;
 	st->base_address = base_address;
 	/* tied to logic low, analog input range is +/- 5V */
diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h
index 746f9553d2ba..acaed8d5379c 100644
--- a/drivers/staging/iio/adc/ad7606.h
+++ b/drivers/staging/iio/adc/ad7606.h
@@ -14,6 +14,7 @@
  * @name:		identification string for chip
  * @channels:		channel specification
  * @num_channels:	number of channels
+ * @lock		protect sensor state
  */
 
 struct ad7606_chip_info {
@@ -23,6 +24,7 @@ struct ad7606_chip_info {
 
 /**
  * struct ad7606_state - driver instance specific data
+ * @lock		protect sensor state
  */
 
 struct ad7606_state {
@@ -37,6 +39,7 @@ struct ad7606_state {
 	bool				done;
 	void __iomem			*base_address;
 
+	struct mutex			lock; /* protect sensor state */
 	struct gpio_desc		*gpio_convst;
 	struct gpio_desc		*gpio_reset;
 	struct gpio_desc		*gpio_range;
diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
index aa251c245981..b2bce26499f5 100644
--- a/drivers/staging/iio/addac/adt7316.c
+++ b/drivers/staging/iio/addac/adt7316.c
@@ -244,7 +244,6 @@ static ssize_t _adt7316_store_enabled(struct adt7316_chip_info *chip,
 	chip->config1 = config1;
 
 	return ret;
-
 }
 
 static ssize_t adt7316_store_enabled(struct device *dev,
@@ -434,7 +433,6 @@ static ssize_t adt7316_store_ad_channel(struct device *dev,
 		config2 = chip->config2 & (~ADT7316_AD_SINGLE_CH_MASK);
 	}
 
-
 	config2 |= data;
 
 	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
@@ -725,7 +723,6 @@ static IIO_DEVICE_ATTR(AIN_internal_Vref, 0644,
 		adt7316_store_AIN_internal_Vref,
 		0);
 
-
 static ssize_t adt7316_show_enable_prop_DACA(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
@@ -925,7 +922,6 @@ static ssize_t adt7316_show_all_DAC_update_modes(struct device *dev,
 static IIO_DEVICE_ATTR(all_DAC_update_modes, 0444,
 		adt7316_show_all_DAC_update_modes, NULL, 0);
 
-
 static ssize_t adt7316_store_update_DAC(struct device *dev,
 		struct device_attribute *attr,
 		const char *buf,
@@ -1867,6 +1863,7 @@ static ssize_t adt7316_set_int_mask(struct device *dev,
 
 	return len;
 }
+
 static inline ssize_t adt7316_show_ad_bound(struct device *dev,
 		struct device_attribute *attr,
 		char *buf)
diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
index ca72af3e9d4b..a6f249e9c1e1 100644
--- a/drivers/staging/iio/cdc/ad7150.c
+++ b/drivers/staging/iio/cdc/ad7150.c
@@ -232,7 +232,7 @@ static int ad7150_write_event_config(struct iio_dev *indio_dev,
 	if (ret < 0)
 		goto error_ret;
 
-	cfg = ret & ~((0x03 << 5) | (0x1 << 7));
+	cfg = ret & ~((0x03 << 5) | BIT(7));
 
 	switch (type) {
 	case IIO_EV_TYPE_MAG_ADAPTIVE:
diff --git a/drivers/staging/iio/cdc/ad7152.c b/drivers/staging/iio/cdc/ad7152.c
index ce0dce85929b..dc6ecd824365 100644
--- a/drivers/staging/iio/cdc/ad7152.c
+++ b/drivers/staging/iio/cdc/ad7152.c
@@ -244,6 +244,7 @@ static int ad7152_write_raw_samp_freq(struct device *dev, int val)
 
 	return ret;
 }
+
 static int ad7152_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int val,
diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index c2c8aa5585e4..cdcb4fccf3fe 100644
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -45,10 +45,10 @@
 #define AD7746_STATUS_RDYCAP		BIT(0)
 
 /* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
-#define AD7746_CAPSETUP_CAPEN		(1 << 7)
-#define AD7746_CAPSETUP_CIN2		(1 << 6) /* AD7746 only */
-#define AD7746_CAPSETUP_CAPDIFF		(1 << 5)
-#define AD7746_CAPSETUP_CACHOP		(1 << 0)
+#define AD7746_CAPSETUP_CAPEN		BIT(7)
+#define AD7746_CAPSETUP_CIN2		BIT(6) /* AD7746 only */
+#define AD7746_CAPSETUP_CAPDIFF		BIT(5)
+#define AD7746_CAPSETUP_CACHOP		BIT(0)
 
 /* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
 #define AD7746_VTSETUP_VTEN		(1 << 7)
@@ -56,9 +56,9 @@
 #define AD7746_VTSETUP_VTMD_EXT_TEMP	(1 << 5)
 #define AD7746_VTSETUP_VTMD_VDD_MON	(2 << 5)
 #define AD7746_VTSETUP_VTMD_EXT_VIN	(3 << 5)
-#define AD7746_VTSETUP_EXTREF		(1 << 4)
-#define AD7746_VTSETUP_VTSHORT		(1 << 1)
-#define AD7746_VTSETUP_VTCHOP		(1 << 0)
+#define AD7746_VTSETUP_EXTREF		BIT(4)
+#define AD7746_VTSETUP_VTSHORT		BIT(1)
+#define AD7746_VTSETUP_VTCHOP		BIT(0)
 
 /* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
 #define AD7746_EXCSETUP_CLKCTRL		BIT(7)
@@ -82,7 +82,7 @@
 #define AD7746_CONF_MODE_GAIN_CAL	(6 << 0)
 
 /* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */
-#define AD7746_CAPDAC_DACEN		(1 << 7)
+#define AD7746_CAPDAC_DACEN		BIT(7)
 #define AD7746_CAPDAC_DACP(x)		((x) & 0x7F)
 
 /*
@@ -547,7 +547,7 @@ static int ad7746_read_raw(struct iio_dev *indio_dev,
 
 		regval = chip->config | AD7746_CONF_MODE_SINGLE_CONV;
 		ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG,
-				regval);
+						regval);
 		if (ret < 0)
 			goto out;
 
diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index 425b8ab06fec..6da46ede7ee0 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -250,22 +250,22 @@ error_ret:
  * see dds.h for further information
  */
 
-static IIO_DEV_ATTR_FREQ(0, 0, S_IWUSR, NULL, ad9832_write, AD9832_FREQ0HM);
-static IIO_DEV_ATTR_FREQ(0, 1, S_IWUSR, NULL, ad9832_write, AD9832_FREQ1HM);
-static IIO_DEV_ATTR_FREQSYMBOL(0, S_IWUSR, NULL, ad9832_write, AD9832_FREQ_SYM);
+static IIO_DEV_ATTR_FREQ(0, 0, 0200, NULL, ad9832_write, AD9832_FREQ0HM);
+static IIO_DEV_ATTR_FREQ(0, 1, 0200, NULL, ad9832_write, AD9832_FREQ1HM);
+static IIO_DEV_ATTR_FREQSYMBOL(0, 0200, NULL, ad9832_write, AD9832_FREQ_SYM);
 static IIO_CONST_ATTR_FREQ_SCALE(0, "1"); /* 1Hz */
 
-static IIO_DEV_ATTR_PHASE(0, 0, S_IWUSR, NULL, ad9832_write, AD9832_PHASE0H);
-static IIO_DEV_ATTR_PHASE(0, 1, S_IWUSR, NULL, ad9832_write, AD9832_PHASE1H);
-static IIO_DEV_ATTR_PHASE(0, 2, S_IWUSR, NULL, ad9832_write, AD9832_PHASE2H);
-static IIO_DEV_ATTR_PHASE(0, 3, S_IWUSR, NULL, ad9832_write, AD9832_PHASE3H);
-static IIO_DEV_ATTR_PHASESYMBOL(0, S_IWUSR, NULL,
+static IIO_DEV_ATTR_PHASE(0, 0, 0200, NULL, ad9832_write, AD9832_PHASE0H);
+static IIO_DEV_ATTR_PHASE(0, 1, 0200, NULL, ad9832_write, AD9832_PHASE1H);
+static IIO_DEV_ATTR_PHASE(0, 2, 0200, NULL, ad9832_write, AD9832_PHASE2H);
+static IIO_DEV_ATTR_PHASE(0, 3, 0200, NULL, ad9832_write, AD9832_PHASE3H);
+static IIO_DEV_ATTR_PHASESYMBOL(0, 0200, NULL,
 				ad9832_write, AD9832_PHASE_SYM);
 static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /* 2PI/2^12 rad*/
 
-static IIO_DEV_ATTR_PINCONTROL_EN(0, S_IWUSR, NULL,
+static IIO_DEV_ATTR_PINCONTROL_EN(0, 0200, NULL,
 				ad9832_write, AD9832_PINCTRL_EN);
-static IIO_DEV_ATTR_OUT_ENABLE(0, S_IWUSR, NULL,
+static IIO_DEV_ATTR_OUT_ENABLE(0, 0200, NULL,
 				ad9832_write, AD9832_OUTPUT_EN);
 
 static struct attribute *ad9832_attributes[] = {
diff --git a/drivers/staging/iio/gyro/adis16060_core.c b/drivers/staging/iio/gyro/adis16060_core.c
index c9d46e796f79..967524583d8a 100644
--- a/drivers/staging/iio/gyro/adis16060_core.c
+++ b/drivers/staging/iio/gyro/adis16060_core.c
@@ -40,25 +40,20 @@ struct adis16060_state {
 
 static struct iio_dev *adis16060_iio_dev;
 
-static int adis16060_spi_write(struct iio_dev *indio_dev, u8 val)
+static int adis16060_spi_write_then_read(struct iio_dev *indio_dev,
+					 u8 conf, u16 *val)
 {
 	int ret;
 	struct adis16060_state *st = iio_priv(indio_dev);
 
 	mutex_lock(&st->buf_lock);
-	st->buf[2] = val; /* The last 8 bits clocked in are latched */
+	st->buf[2] = conf; /* The last 8 bits clocked in are latched */
 	ret = spi_write(st->us_w, st->buf, 3);
-	mutex_unlock(&st->buf_lock);
-
-	return ret;
-}
-
-static int adis16060_spi_read(struct iio_dev *indio_dev, u16 *val)
-{
-	int ret;
-	struct adis16060_state *st = iio_priv(indio_dev);
 
-	mutex_lock(&st->buf_lock);
+	if (ret < 0) {
+		mutex_unlock(&st->buf_lock);
+		return ret;
+	}
 
 	ret = spi_read(st->us_r, st->buf, 3);
 
@@ -86,17 +81,11 @@ static int adis16060_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		/* Take the iio_dev status lock */
-		mutex_lock(&indio_dev->mlock);
-		ret = adis16060_spi_write(indio_dev, chan->address);
+		ret = adis16060_spi_write_then_read(indio_dev,
+						    chan->address, &tval);
 		if (ret < 0)
-			goto out_unlock;
+			return ret;
 
-		ret = adis16060_spi_read(indio_dev, &tval);
-		if (ret < 0)
-			goto out_unlock;
-
-		mutex_unlock(&indio_dev->mlock);
 		*val = tval;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_OFFSET:
@@ -110,10 +99,6 @@ static int adis16060_read_raw(struct iio_dev *indio_dev,
 	}
 
 	return -EINVAL;
-
-out_unlock:
-	mutex_unlock(&indio_dev->mlock);
-	return ret;
 }
 
 static const struct iio_info adis16060_info = {
diff --git a/drivers/staging/iio/light/tsl2x7x_core.c b/drivers/staging/iio/light/tsl2x7x_core.c
index ea15bc1c300c..af3910bc1b4f 100644
--- a/drivers/staging/iio/light/tsl2x7x_core.c
+++ b/drivers/staging/iio/light/tsl2x7x_core.c
@@ -854,7 +854,7 @@ void tsl2x7x_prox_calculate(int *data, int length,
 		tmp = data[i] - statP->mean;
 		sample_sum += tmp * tmp;
 	}
-	statP->stddev = int_sqrt((long)sample_sum) / length;
+	statP->stddev = int_sqrt((long)sample_sum / length);
 }
 
 /**
@@ -1676,7 +1676,7 @@ static const struct attribute_group tsl2X7X_device_attr_group_tbl[] = {
 	},
 };
 
-static struct attribute_group tsl2X7X_event_attr_group_tbl[] = {
+static const struct attribute_group tsl2X7X_event_attr_group_tbl[] = {
 	[ALS] = {
 		.attrs = tsl2X7X_ALS_event_attrs,
 		.name = "events",
diff --git a/drivers/staging/iio/meter/ade7753.c b/drivers/staging/iio/meter/ade7753.c
index dfd8b71d6a41..b71fbd313778 100644
--- a/drivers/staging/iio/meter/ade7753.c
+++ b/drivers/staging/iio/meter/ade7753.c
@@ -83,10 +83,10 @@
  * @buf_lock:       mutex to protect tx and rx
  **/
 struct ade7753_state {
-	    struct spi_device   *us;
-		    struct mutex        buf_lock;
-			    u8          tx[ADE7753_MAX_TX] ____cacheline_aligned;
-				    u8          rx[ADE7753_MAX_RX];
+	struct spi_device   *us;
+	struct mutex        buf_lock;
+	u8          tx[ADE7753_MAX_TX] ____cacheline_aligned;
+	u8          rx[ADE7753_MAX_RX];
 };
 
 static int ade7753_spi_write_reg_8(struct device *dev,
diff --git a/drivers/staging/iio/meter/ade7754.c b/drivers/staging/iio/meter/ade7754.c
index c8d2d4c24e9d..32dc50341746 100644
--- a/drivers/staging/iio/meter/ade7754.c
+++ b/drivers/staging/iio/meter/ade7754.c
@@ -6,18 +6,17 @@
  * Licensed under the GPL-2 or later.
  */
 
-#include <linux/interrupt.h>
-#include <linux/irq.h>
 #include <linux/delay.h>
-#include <linux/mutex.h>
 #include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
-#include <linux/list.h>
-#include <linux/module.h>
-
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include "meter.h"
@@ -97,7 +96,7 @@
 /**
  * struct ade7754_state - device instance specific data
  * @us:			actual spi_device
- * @buf_lock:		mutex to protect tx and rx
+ * @buf_lock:		mutex to protect tx, rx and write frequency
  * @tx:			transmit buffer
  * @rx:			receive buffer
  **/
@@ -108,17 +107,25 @@ struct ade7754_state {
 	u8			rx[ADE7754_MAX_RX];
 };
 
-static int ade7754_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val)
+/* Unlocked version of ade7754_spi_write_reg_8 function */
+static int __ade7754_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val)
 {
-	int ret;
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ade7754_state *st = iio_priv(indio_dev);
 
-	mutex_lock(&st->buf_lock);
 	st->tx[0] = ADE7754_WRITE_REG(reg_address);
 	st->tx[1] = val;
+	return spi_write(st->us, st->tx, 2);
+}
+
+static int ade7754_spi_write_reg_8(struct device *dev, u8 reg_address, u8 val)
+{
+	int ret;
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ade7754_state *st = iio_priv(indio_dev);
 
-	ret = spi_write(st->us, st->tx, 2);
+	mutex_lock(&st->buf_lock);
+	ret = __ade7754_spi_write_reg_8(dev, reg_address, val);
 	mutex_unlock(&st->buf_lock);
 
 	return ret;
@@ -513,7 +520,7 @@ static ssize_t ade7754_write_frequency(struct device *dev,
 	if (!val)
 		return -EINVAL;
 
-	mutex_lock(&indio_dev->mlock);
+	mutex_lock(&st->buf_lock);
 
 	t = 26000 / val;
 	if (t > 0)
@@ -531,10 +538,10 @@ static ssize_t ade7754_write_frequency(struct device *dev,
 	reg &= ~(3 << 3);
 	reg |= t << 3;
 
-	ret = ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg);
+	ret = __ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg);
 
 out:
-	mutex_unlock(&indio_dev->mlock);
+	mutex_unlock(&st->buf_lock);
 
 	return ret ? ret : len;
 }