First set of IIO fixes for the 4.5 cycle.

This set comprises those not dependent on patches in the 4.5 merge cycle.
 A second set will follow shortly with ones that are.
 
 * core in kernel interfaces
   - fix a possible NULL dereference that is a theoretical possibility
     via odd usage of iio_channel_release. Pretty much a hardening of
     the interface, but observed in the wild with the twl4030_charger
     driver.
 * acpi-als
   - report the data as processed as it is in lux.  This fixes a wrong
     use of the IIO ABI.  However, old _raw version retained to avoid
     breaking any userspace in the wild that is relying on that (none
     known but it doesn't hurt us much to retain it)
 * ade7753
   - fix some error handling to avoid use of unitialized data.
 * ltr501
   - use a signed return type for ltr501_match_samp_freq so as to allow
     returning of an error code.
 * mcp4725
   - set name field of struct iio_dev to ensure the sysfs name attribute
     doesn't give NULL.
 * mpl115
   - temperature offset sign is wrong.
 * stk8ba50
   - IIO_TRIGGER dependency added
 * ti_am335x_adc
   - Label buffer as a software buffer. It's actually a hybrid of a
     true hardware buffer feeding a kfifo, but the meaning of these fields
     has changed a little recently and in this case it should be labeled
     a software buffer ensure it is allowed to use the kfifo.
 * vf610_adc
   - HAS_IOMEM dependency
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Merge tag 'iio-fixes-for-4.5a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-linus

Jonathan writes:

First set of IIO fixes for the 4.5 cycle.

This set comprises those not dependent on patches in the 4.5 merge cycle.
A second set will follow shortly with ones that are.

* core in kernel interfaces
  - fix a possible NULL dereference that is a theoretical possibility
    via odd usage of iio_channel_release. Pretty much a hardening of
    the interface, but observed in the wild with the twl4030_charger
    driver.
* acpi-als
  - report the data as processed as it is in lux.  This fixes a wrong
    use of the IIO ABI.  However, old _raw version retained to avoid
    breaking any userspace in the wild that is relying on that (none
    known but it doesn't hurt us much to retain it)
* ade7753
  - fix some error handling to avoid use of unitialized data.
* ltr501
  - use a signed return type for ltr501_match_samp_freq so as to allow
    returning of an error code.
* mcp4725
  - set name field of struct iio_dev to ensure the sysfs name attribute
    doesn't give NULL.
* mpl115
  - temperature offset sign is wrong.
* stk8ba50
  - IIO_TRIGGER dependency added
* ti_am335x_adc
  - Label buffer as a software buffer. It's actually a hybrid of a
    true hardware buffer feeding a kfifo, but the meaning of these fields
    has changed a little recently and in this case it should be labeled
    a software buffer ensure it is allowed to use the kfifo.
* vf610_adc
  - HAS_IOMEM dependency

drivers/iio/accel/Kconfig

@@ -213,6 +213,7 @@ config STK8312
 config STK8BA50
 	tristate "Sensortek STK8BA50 3-Axis Accelerometer Driver"
 	depends on I2C
+	depends on IIO_TRIGGER
 	help
 	  Say yes here to get support for the Sensortek STK8BA50 3-axis
 	  accelerometer.

drivers/iio/adc/Kconfig

@@ -409,6 +409,7 @@ config TWL6030_GPADC
 config VF610_ADC
 	tristate "Freescale vf610 ADC driver"
 	depends on OF
+	depends on HAS_IOMEM
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help

drivers/iio/adc/ti_am335x_adc.c

@@ -289,7 +289,7 @@ static int tiadc_iio_buffered_hardware_setup(struct iio_dev *indio_dev,
 		goto error_kfifo_free;
 
 	indio_dev->setup_ops = setup_ops;
-	indio_dev->modes |= INDIO_BUFFER_HARDWARE;
+	indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
 
 	return 0;
 

drivers/iio/dac/mcp4725.c

@@ -300,6 +300,7 @@ static int mcp4725_probe(struct i2c_client *client,
 	data->client = client;
 
 	indio_dev->dev.parent = &client->dev;
+	indio_dev->name = id->name;
 	indio_dev->info = &mcp4725_info;
 	indio_dev->channels = &mcp4725_channel;
 	indio_dev->num_channels = 1;

drivers/iio/inkern.c

@@ -349,6 +349,8 @@ EXPORT_SYMBOL_GPL(iio_channel_get);
 
 void iio_channel_release(struct iio_channel *channel)
 {
+	if (!channel)
+		return;
 	iio_device_put(channel->indio_dev);
 	kfree(channel);
 }

drivers/iio/light/acpi-als.c

@@ -54,7 +54,9 @@ static const struct iio_chan_spec acpi_als_channels[] = {
 			.realbits	= 32,
 			.storagebits	= 32,
 		},
-		.info_mask_separate	= BIT(IIO_CHAN_INFO_RAW),
+		/* _RAW is here for backward ABI compatibility */
+		.info_mask_separate	= BIT(IIO_CHAN_INFO_RAW) |
+					  BIT(IIO_CHAN_INFO_PROCESSED),
 	},
 };
 
@@ -152,7 +154,7 @@ static int acpi_als_read_raw(struct iio_dev *indio_dev,
 	s32 temp_val;
 	int ret;
 
-	if (mask != IIO_CHAN_INFO_RAW)
+	if ((mask != IIO_CHAN_INFO_PROCESSED) && (mask != IIO_CHAN_INFO_RAW))
 		return -EINVAL;
 
 	/* we support only illumination (_ALI) so far. */

drivers/iio/light/ltr501.c

@@ -180,7 +180,7 @@ static const struct ltr501_samp_table ltr501_ps_samp_table[] = {
 			{500000, 2000000}
 };
 
-static unsigned int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
+static int ltr501_match_samp_freq(const struct ltr501_samp_table *tab,
 					   int len, int val, int val2)
 {
 	int i, freq;

drivers/iio/pressure/mpl115.c

@@ -117,7 +117,7 @@ static int mpl115_read_raw(struct iio_dev *indio_dev,
 		*val = ret >> 6;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_OFFSET:
-		*val = 605;
+		*val = -605;
 		*val2 = 750000;
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_SCALE:

drivers/staging/iio/meter/ade7753.c

@@ -217,8 +217,12 @@ static ssize_t ade7753_write_16bit(struct device *dev,
 static int ade7753_reset(struct device *dev)
 {
 	u16 val;
+	int ret;
+
+	ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
+	if (ret)
+		return ret;
 
-	ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
 	val |= BIT(6); /* Software Chip Reset */
 
 	return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);
@@ -343,8 +347,12 @@ static int ade7753_set_irq(struct device *dev, bool enable)
 static int ade7753_stop_device(struct device *dev)
 {
 	u16 val;
+	int ret;
+
+	ret = ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
+	if (ret)
+		return ret;
 
-	ade7753_spi_read_reg_16(dev, ADE7753_MODE, &val);
 	val |= BIT(4);  /* AD converters can be turned off */
 
 	return ade7753_spi_write_reg_16(dev, ADE7753_MODE, val);