On Wed, 20 Feb 2019 18:20:52 +0300
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> 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.
>
> 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@xxxxxxxxxxxxxxx>
Hi Andy,
I sort of agree that there is no obvious reason to limit it to
DT. One corner that is unfortunate is that we have ACPI DSDT with
_OFT providing the same thing. Neither is 'standard' as such.
Also, could we have an example of what the DSDT would look like
to provide this for a device? I'm too lazy to figure it out for
myself given you probably already know off the top of your head ;)
Thanks,
Jonathan
> ---
> drivers/iio/accel/kxsd9.c | 2 +-
> drivers/iio/gyro/mpu3050-core.c | 2 +-
> drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 2 +-
> drivers/iio/industrialio-core.c | 46 +++++++++-------------
> drivers/iio/magnetometer/ak8974.c | 2 +-
> drivers/iio/magnetometer/ak8975.c | 2 +-
> include/linux/iio/iio.h | 4 +-
> 7 files changed, 25 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
> index 0c0df4fce420..f73404ca715e 100644
> --- a/drivers/iio/accel/kxsd9.c
> +++ b/drivers/iio/accel/kxsd9.c
> @@ -420,7 +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,
> + ret = iio_read_mount_matrix(dev,
> "mount-matrix",
> &st->orientation);
> if (ret)
> diff --git a/drivers/iio/gyro/mpu3050-core.c b/drivers/iio/gyro/mpu3050-core.c
> index 77fac81a3adc..0a7d0dde020e 100644
> --- a/drivers/iio/gyro/mpu3050-core.c
> +++ b/drivers/iio/gyro/mpu3050-core.c
> @@ -1149,7 +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",
> + 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..e2c8e8ca324a 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> @@ -990,7 +990,7 @@ 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",
> + result = iio_read_mount_matrix(dev, "mount-matrix",
> &st->orientation);
> if (result) {
> dev_err(dev, "Failed to retrieve mounting matrix %d\n",
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 4f5cd9f60870..3baede140d69 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..9bf21e5fe3fc 100644
> --- a/drivers/iio/magnetometer/ak8974.c
> +++ b/drivers/iio/magnetometer/ak8974.c
> @@ -733,7 +733,7 @@ static int ak8974_probe(struct i2c_client *i2c,
> ak8974->i2c = i2c;
> mutex_init(&ak8974->lock);
>
> - ret = of_iio_read_mount_matrix(&i2c->dev,
> + ret = iio_read_mount_matrix(&i2c->dev,
> "mount-matrix",
> &ak8974->orientation);
> if (ret)
> diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
> index d430b80808ef..dca20df1310e 100644
> --- a/drivers/iio/magnetometer/ak8975.c
> +++ b/drivers/iio/magnetometer/ak8975.c
> @@ -911,7 +911,7 @@ static int ak8975_probe(struct i2c_client *client,
> data->eoc_irq = 0;
>
> if (!pdata) {
> - err = of_iio_read_mount_matrix(&client->dev,
> + err = iio_read_mount_matrix(&client->dev,
> "mount-matrix",
> &data->orientation);
> if (err)
> 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,
