[PATCH v2 01/10] iio: Allow to read mount matrix from ACPI

H. Nikolaus Schaller
2019-02-21T17:03:42Z

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Currently mount matrix is allowed in Device Tree, though there is
no technical issue to extend it to support ACPI.

Convert the function to use device_property_read_string_array() and
thus allow to read mount matrix from ACPI if available.

Example of use in _DSD method:

Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () { "mount-matrix", Package() {
"1", "0", "0",
"0", "0.866", "0.5",
"0", "-0.5", "0.866",
} },
}
})

At the same time drop the "of" prefix from its name and
convert current users.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/iio/accel/kxsd9.c | 4 +-
drivers/iio/gyro/mpu3050-core.c | 3 +-
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 4 +-
drivers/iio/industrialio-core.c | 46 +++++++++-------------
drivers/iio/magnetometer/ak8974.c | 5 +--
drivers/iio/magnetometer/ak8975.c | 5 +--
include/linux/iio/iio.h | 4 +-
7 files changed, 28 insertions(+), 43 deletions(-)

diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
index 0c0df4fce420..70c60db62247 100644
--- a/drivers/iio/accel/kxsd9.c
+++ b/drivers/iio/accel/kxsd9.c
@@ -420,9 +420,7 @@ int kxsd9_common_probe(struct device *dev,
indio_dev->available_scan_masks = kxsd9_scan_masks;

/* Read the mounting matrix, if present */
- ret = of_iio_read_mount_matrix(dev,
- "mount-matrix",
- &st->orientation);
+ ret = iio_read_mount_matrix(dev, "mount-matrix", &st->orientation);
if (ret)
return ret;

diff --git a/drivers/iio/gyro/mpu3050-core.c b/drivers/iio/gyro/mpu3050-core.c
index 77fac81a3adc..8200e48f561b 100644
--- a/drivers/iio/gyro/mpu3050-core.c
+++ b/drivers/iio/gyro/mpu3050-core.c
@@ -1149,8 +1149,7 @@ int mpu3050_common_probe(struct device *dev,
mpu3050->divisor = 99;

/* Read the mounting matrix, if present */
- ret = of_iio_read_mount_matrix(dev, "mount-matrix",
- &mpu3050->orientation);
+ ret = iio_read_mount_matrix(dev, "mount-matrix", &mpu3050->orientation);
if (ret)
return ret;

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 1e428c196a82..533d1f8321ac 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -990,8 +990,8 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,

pdata = dev_get_platdata(dev);
if (!pdata) {
- result = of_iio_read_mount_matrix(dev, "mount-matrix",
- &st->orientation);
+ result = iio_read_mount_matrix(dev, "mount-matrix",
+ &st->orientation);
if (result) {
dev_err(dev, "Failed to retrieve mounting matrix %d\n",
result);
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 4f5cd9f60870..0a40f1df49c7 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -19,6 +19,7 @@
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/poll.h>
+#include <linux/property.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/cdev.h>
@@ -525,8 +526,8 @@ ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
EXPORT_SYMBOL_GPL(iio_show_mount_matrix);

/**
- * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
- * device-tree "mount-matrix" property
+ * iio_read_mount_matrix() - retrieve iio device mounting matrix from
+ * device "mount-matrix" property
* @dev: device the mounting matrix property is assigned to
* @propname: device specific mounting matrix property name
* @matrix: where to store retrieved matrix
@@ -536,40 +537,29 @@ EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
*
* Return: 0 if success, or a negative error code on failure.
*/
-#ifdef CONFIG_OF
-int of_iio_read_mount_matrix(const struct device *dev,
- const char *propname,
- struct iio_mount_matrix *matrix)
+int iio_read_mount_matrix(struct device *dev, const char *propname,
+ struct iio_mount_matrix *matrix)
{
- if (dev->of_node) {
- int err = of_property_read_string_array(dev->of_node,
- propname, matrix->rotation,
- ARRAY_SIZE(iio_mount_idmatrix.rotation));
+ size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
+ int err;

- if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
- return 0;
+ err = device_property_read_string_array(dev, propname,
+ matrix->rotation, len);
+ if (err == len)
+ return 0;

- if (err >= 0)
- /* Invalid number of matrix entries. */
- return -EINVAL;
+ if (err >= 0)
+ /* Invalid number of matrix entries. */
+ return -EINVAL;

- if (err != -EINVAL)
- /* Invalid matrix declaration format. */
- return err;
- }
+ if (err != -EINVAL)
+ /* Invalid matrix declaration format. */
+ return err;

/* Matrix was not declared at all: fallback to identity. */
return iio_setup_mount_idmatrix(dev, matrix);
}
-#else
-int of_iio_read_mount_matrix(const struct device *dev,
- const char *propname,
- struct iio_mount_matrix *matrix)
-{
- return iio_setup_mount_idmatrix(dev, matrix);
-}
-#endif
-EXPORT_SYMBOL(of_iio_read_mount_matrix);
+EXPORT_SYMBOL(iio_read_mount_matrix);

static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
int size, const int *vals)
diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c
index 93be1f4c0f27..f4d0a6c0fde7 100644
--- a/drivers/iio/magnetometer/ak8974.c
+++ b/drivers/iio/magnetometer/ak8974.c
@@ -733,9 +733,8 @@ static int ak8974_probe(struct i2c_client *i2c,
ak8974->i2c = i2c;
mutex_init(&ak8974->lock);

- ret = of_iio_read_mount_matrix(&i2c->dev,
- "mount-matrix",
- &ak8974->orientation);
+ ret = iio_read_mount_matrix(&i2c->dev, "mount-matrix",
+ &ak8974->orientation);
if (ret)
return ret;

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index d430b80808ef..db7214ac514c 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -911,9 +911,8 @@ static int ak8975_probe(struct i2c_client *client,
data->eoc_irq = 0;

if (!pdata) {
- err = of_iio_read_mount_matrix(&client->dev,
- "mount-matrix",
- &data->orientation);
+ err = iio_read_mount_matrix(&client->dev, "mount-matrix",
+ &data->orientation);
if (err)
return err;
} else
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index a74cb177dc6f..bb10c1bee301 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -130,8 +130,8 @@ struct iio_mount_matrix {

ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv,
const struct iio_chan_spec *chan, char *buf);
-int of_iio_read_mount_matrix(const struct device *dev, const char *propname,
- struct iio_mount_matrix *matrix);
+int iio_read_mount_matrix(struct device *dev, const char *propname,
+ struct iio_mount_matrix *matrix);

typedef const struct iio_mount_matrix *
(iio_get_mount_matrix_t)(const struct iio_dev *indio_dev,
--
2.19.1