BMC/Intel-BMC/linux.git/include/linux/iio/iio.h, branch dev-4.10

iio: inkern: add helpers to query available values from channels

2016-11-13T11:40:26+00:00

Specifically a helper for reading the available maximum raw value of a channel and a helper for forwarding read_avail requests for raw values from one iio driver to an iio channel that is consumed. These rather specific helpers are in turn built with generic helpers making it easy to build more helpers for available values as needed. Signed-off-by: Peter Rosin Signed-off-by: Jonathan Cameron

iio:core: add a callback to allow drivers to provide _available attributes

2016-11-13T11:40:25+00:00

A large number of attributes can only take a limited range of values. Currently in IIO this is handled by directly registering additional *_available attributes thus providing this information to userspace. It is desirable to provide this information via the core for much the same reason this was done for the actual channel information attributes in the first place. If it isn't there, then it can only really be accessed from userspace. Other in kernel IIO consumers have no access to what valid parameters are. Two forms are currently supported: * list of values in one particular IIO_VAL_* format. e.g. 1.300000 1.500000 1.730000 * range specification with a step size: e.g. [1.000000 0.500000 2.500000] equivalent to 1.000000 1.5000000 2.000000 2.500000 An addition set of masks are used to allow different sharing rules for the *_available attributes generated. This allows for example: in_accel_x_offset in_accel_y_offset in_accel_offset_available. We could have gone with having a specification for each and every info_mask element but that would have meant changing the existing userspace ABI. This approach does not. Signed-off-by: Jonathan Cameron [forward ported, added some docs and fixed buffer overflows /peda] Acked-by: Daniel Baluta Signed-off-by: Peter Rosin Signed-off-by: Jonathan Cameron

iio: Declare event_attrs field of iio_info structure as const

2016-10-01T13:37:35+00:00

The event_attrs field of iio_info structure is only initialized once whenever an object of iio_info is created. After that this field is never modified again anywhere in the kernel. So, declare event_attrs field of iio_info as a const struct attribute_group. Checked for occurences throughout the kernel using grep and coccinelle. Signed-off-by: Bhumika Goyal Signed-off-by: Jonathan Cameron

iio: add resource managed triggered buffer init helpers

2016-09-04T14:42:46+00:00

Add resource managed devm_iio_triggered_buffer_setup() and devm_iio_triggered_buffer_cleanup() to automatically clean up triggered buffers setup by IIO drivers, thus leading to simplified IIO drivers code. Signed-off-by: Gregor Boirie Signed-off-by: Jonathan Cameron

iio: trigger: allow immutable triggers to be assigned

2016-09-03T14:31:55+00:00

There are times when an assigned trigger to a device shouldn't ever change after intialization. Examples of this being used is when an provider device has a trigger that is assigned to an ADC, which uses it populate data into a callback buffer. Signed-off-by: Matt Ranostay Signed-off-by: Jonathan Cameron

iio:core: timestamping clock selection support

2016-06-30T18:41:38+00:00

Adds a new per-device sysfs attribute "current_timestamp_clock" to allow userspace to select a particular POSIX clock for buffered samples and events timestamping. Following clocks, as listed in clock_gettime(2), are supported: CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW, CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and CLOCK_TAI. Signed-off-by: Gregor Boirie Acked-by: Sanchayan Maity Signed-off-by: Jonathan Cameron

iio:core: mounting matrix support

2016-04-23T21:13:05+00:00

Expose a rotation matrix to indicate userspace the chip placement with respect to the overall hardware system. This is needed to adjust coordinates sampled from a sensor chip when its position deviates from the main hardware system. Final coordinates computation is delegated to userspace since: * computation may involve floating point arithmetics ; * it allows an application to combine adjustments with arbitrary transformations. This 3 dimentional space rotation matrix is expressed as 3x3 array of strings to support floating point numbers. It may be retrieved from a "[_][_]mount_matrix" sysfs attribute file. It is declared into a device / driver specific DTS property or platform data. Signed-off-by: Gregor Boirie Signed-off-by: Jonathan Cameron

iio: core: implement iio_device_{claim|release}_direct_mode()

2016-03-12T11:17:19+00:00

It is often the case that the driver wants to be sure a device stays in direct mode while it is executing a task or series of tasks. To accomplish this today, the driver performs this sequence: 1) take the device state lock, 2) verify it is not in a buffered mode, 3) execute some tasks, and 4) release that lock. This patch introduces a pair of helper functions that simplify these steps and make it more semantically expressive. iio_device_claim_direct_mode() If the device is not in any buffered mode it is guaranteed to stay that way until iio_release_direct_mode() is called. iio_device_release_direct_mode() Release the claim. Device is no longer guaranteed to stay in direct mode. Signed-off-by: Alison Schofield Signed-off-by: Jonathan Cameron

iio: Fix typos in the struct iio_event_spec documentation comments

2016-02-17T21:11:08+00:00

This patch fixes a few minor typos in the documentation comments for the scan_type member of the iio_event_spec structure. The sign member name was improperly capitalized as "Sign" in the comments. The storagebits member name was improperly listed as "storage_bits" in the comments. The endianness member entry in the comments was moved after the repeat member entry in order to maintain consistency with the actual struct iio_event_spec layout. Signed-off-by: William Breathitt Gray Signed-off-by: Jonathan Cameron

iio: Fix documentation for iio_dev mlock

2016-02-08T18:34:32+00:00

mlock *must* be used by core and drivers to protect access to devices state changes. Signed-off-by: Daniel Baluta Signed-off-by: Jonathan Cameron