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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-05 11:42:48 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-05 11:42:48 -0800
commitbe61a0d78449f53519905640ac3a9f24c197cbaf (patch)
tree216a7655e2d6dc8f751214aa93a4863a27954a98 /drivers/iio/inkern.c
parent7be921a226dcbbbd8fb6f5d63bea4856b3a11624 (diff)
parent4e4cd14e7cbead5ca20465f4a7ce973d42434a2f (diff)
downloadlinux-be61a0d78449f53519905640ac3a9f24c197cbaf.tar.bz2
Merge tag 'iio-for-3.19a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes: First round of new drivers, features and cleanups for IIO in the 3.19 cycle. New drivers / supported parts * rockchip - rk3066-tsadc variant * si7020 humidity and temperature sensor * mcp320x - add mcp3001, mcp3002, mcp3004, mcp3008, mcp3201, mcp3202 * bmp280 pressure and temperature sensor * Qualcomm SPMI PMIC current ADC driver * Exynos_adc - support exynos7 New features * vf610-adc - add temperature sensor support * Documentation of current attributes, scaled pressure, offset and scaled humidity, RGBC intensity gain factor and scale applied to differential voltage channels. * Bring iio_event_monitor up to date with newer modifiers. * Add of_xlate function to allow for complex channel mappings from the device tree. * Add -g parameter to generic_buffer example to allow for devices with directly fed (no trigger) buffers. * Move exynos driver over to syscon for PMU register access. Cleanups, fixes for new drivers * lis3l02dq drop an unneeded else. * st sensors - renam st_sensors to st_sensor_settings (for clarity) * st sensors - drop an unused parameter from all the probe utility functions. * vf610 better error handling and tidy up. * si7020 - cleanups following merge * as3935 - drop some unnecessary semicolons. * bmp280 - fix the pressure calculation.
Diffstat (limited to 'drivers/iio/inkern.c')
-rw-r--r--drivers/iio/inkern.c33
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f0846108d006..866fe904cba2 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -100,6 +100,28 @@ static int iio_dev_node_match(struct device *dev, void *data)
return dev->of_node == data && dev->type == &iio_device_type;
}
+/**
+ * __of_iio_simple_xlate - translate iiospec to the IIO channel index
+ * @indio_dev: pointer to the iio_dev structure
+ * @iiospec: IIO specifier as found in the device tree
+ *
+ * This is simple translation function, suitable for the most 1:1 mapped
+ * channels in IIO chips. This function performs only one sanity check:
+ * whether IIO index is less than num_channels (that is specified in the
+ * iio_dev).
+ */
+static int __of_iio_simple_xlate(struct iio_dev *indio_dev,
+ const struct of_phandle_args *iiospec)
+{
+ if (!iiospec->args_count)
+ return 0;
+
+ if (iiospec->args[0] >= indio_dev->num_channels)
+ return -EINVAL;
+
+ return iiospec->args[0];
+}
+
static int __of_iio_channel_get(struct iio_channel *channel,
struct device_node *np, int index)
{
@@ -122,18 +144,19 @@ static int __of_iio_channel_get(struct iio_channel *channel,
indio_dev = dev_to_iio_dev(idev);
channel->indio_dev = indio_dev;
- index = iiospec.args_count ? iiospec.args[0] : 0;
- if (index >= indio_dev->num_channels) {
- err = -EINVAL;
+ if (indio_dev->info->of_xlate)
+ index = indio_dev->info->of_xlate(indio_dev, &iiospec);
+ else
+ index = __of_iio_simple_xlate(indio_dev, &iiospec);
+ if (index < 0)
goto err_put;
- }
channel->channel = &indio_dev->channels[index];
return 0;
err_put:
iio_device_put(indio_dev);
- return err;
+ return index;
}
static struct iio_channel *of_iio_channel_get(struct device_node *np, int index)