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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/staging/iio/Documentation | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/staging/iio/Documentation')
-rw-r--r-- | drivers/staging/iio/Documentation/inkernel.txt | 58 | ||||
-rw-r--r-- | drivers/staging/iio/Documentation/sysfs-bus-iio-adc-ad7280a | 21 | ||||
-rw-r--r-- | drivers/staging/iio/Documentation/sysfs-bus-iio-dds | 96 |
3 files changed, 175 insertions, 0 deletions
diff --git a/drivers/staging/iio/Documentation/inkernel.txt b/drivers/staging/iio/Documentation/inkernel.txt new file mode 100644 index 0000000000..ab528409bb --- /dev/null +++ b/drivers/staging/iio/Documentation/inkernel.txt @@ -0,0 +1,58 @@ +Industrial I/O Subsystem in kernel consumers. + +The IIO subsystem can act as a layer under other elements of the kernel +providing a means of obtaining ADC type readings or of driving DAC type +signals. The functionality supported will grow as use cases arise. + +Describing the channel mapping (iio/machine.h) + +Channel associations are described using: + +struct iio_map { + const char *adc_channel_label; + const char *consumer_dev_name; + const char *consumer_channel; +}; + +adc_channel_label identifies the channel on the IIO device by being +matched against the datasheet_name field of the iio_chan_spec. + +consumer_dev_name allows identification of the consumer device. +This are then used to find the channel mapping from the consumer device (see +below). + +Finally consumer_channel is a string identifying the channel to the consumer. +(Perhaps 'battery_voltage' or similar). + +An array of these structures is then passed to the IIO driver. + +Supporting in kernel interfaces in the driver (driver.h) + +The driver must provide datasheet_name values for its channels and +must pass the iio_map structures and a pointer to its own iio_dev structure + on to the core via a call to iio_map_array_register. On removal, +iio_map_array_unregister reverses this process. + +The result of this is that the IIO core now has all the information needed +to associate a given channel with the consumer requesting it. + +Acting as an IIO consumer (consumer.h) + +The consumer first has to obtain an iio_channel structure from the core +by calling iio_channel_get(). The correct channel is identified by: + +* matching dev or dev_name against consumer_dev and consumer_dev_name +* matching consumer_channel against consumer_channel in the map + +There are then a number of functions that can be used to get information +about this channel such as it's current reading. + +e.g. +iio_read_channel_raw() - get a reading +iio_get_channel_type() - get the type of channel + +There is also provision for retrieving all of the channels associated +with a given consumer. This is useful for generic drivers such as +iio_hwmon where the number and naming of channels is not known by the +consumer driver. To do this, use iio_channel_get_all. + diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-adc-ad7280a b/drivers/staging/iio/Documentation/sysfs-bus-iio-adc-ad7280a new file mode 100644 index 0000000000..863d385671 --- /dev/null +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-adc-ad7280a @@ -0,0 +1,21 @@ +What: /sys/bus/iio/devices/deviceX/inY-inZ_balance_switch_en +KernelVersion: 3.0.0 +Contact: linux-iio@vger.kernel.org +Description: + Writing 1 enables the cell balance output switch corresponding + to input Y. Writing 0 disables it. If the inY-inZ_balance_timer + is set to a none zero value, the corresponding switch will + enable for the programmed amount of time, before it + automatically disables. + +What: /sys/bus/iio/devices/deviceX/inY-inZ_balance_timer +KernelVersion: 3.0.0 +Contact: linux-iio@vger.kernel.org +Description: + The inY-inZ_balance_timer file allows the user to program + individual times for each cell balance output. The AD7280A + allows the user to set the timer to a value from 0 minutes to + 36.9 minutes. The resolution of the timer is 71.5 sec. + The value written is the on-time in milliseconds. When the + timer value is set 0, the timer is disabled. The cell balance + outputs are controlled only by inY-inZ_balance_switch_en. diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-dds b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds new file mode 100644 index 0000000000..ee8c509c67 --- /dev/null +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds @@ -0,0 +1,96 @@ + +What: /sys/bus/iio/devices/.../out_altvoltageX_frequencyY +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Stores frequency into tuning word Y. + There will be more than one out_altvoltageX_frequencyY file, + which allows for pin controlled FSK Frequency Shift Keying + (out_altvoltageX_pincontrol_frequency_en is active) or the user + can control the desired active tuning word by writing Y to the + out_altvoltageX_frequencysymbol file. + +What: /sys/bus/iio/devices/.../out_altvoltageX_frequencyY_scale +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Scale to be applied to out_altvoltageX_frequencyY in order to + obtain the desired value in Hz. If shared across all frequency + registers Y is not present. It is also possible X is not present + if shared across all channels. + +What: /sys/bus/iio/devices/.../out_altvoltageX_frequencysymbol +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Specifies the active output frequency tuning word. The value + corresponds to the Y in out_altvoltageX_frequencyY. + To exit this mode the user can write + out_altvoltageX_pincontrol_frequency_en or + out_altvoltageX_out_enable file. + +What: /sys/bus/iio/devices/.../out_altvoltageX_phaseY +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Stores phase into Y. + There will be more than one out_altvoltageX_phaseY file, which + allows for pin controlled PSK Phase Shift Keying + (out_altvoltageX_pincontrol_phase_en is active) or the user can + control the desired phase Y which is added to the phase + accumulator output by writing Y to the phase_en file. + +What: /sys/bus/iio/devices/.../out_altvoltageX_phaseY_scale +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Scale to be applied to out_altvoltageX_phaseY in order to obtain + the desired value in rad. If shared across all phase registers + Y is not present. It is also possible X is not present if + shared across all channels. + +What: /sys/bus/iio/devices/.../out_altvoltageX_phasesymbol +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Specifies the active phase Y which is added to the phase + accumulator output. The value corresponds to the Y in + out_altvoltageX_phaseY. To exit this mode the user can write + out_altvoltageX_pincontrol_phase_en or disable file. + +What: /sys/bus/iio/devices/.../out_altvoltageX_pincontrol_en +What: /sys/bus/iio/devices/.../out_altvoltageX_pincontrol_frequency_en +What: /sys/bus/iio/devices/.../out_altvoltageX_pincontrol_phase_en +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + out_altvoltageX_pincontrol_en: Both, the active frequency and + phase is controlled by the respective phase and frequency + control inputs. In case the device in features independent + controls, then there are dedicated files + (out_altvoltageX_pincontrol_frequency_en, + out_altvoltageX_pincontrol_phase_en). + +What: /sys/bus/iio/devices/.../out_altvoltageX_out_enable +What: /sys/bus/iio/devices/.../out_altvoltageX_outY_enable +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + out_altvoltageX_outY_enable controls signal generation on + output Y of channel X. Y may be suppressed if all channels are + controlled together. + +What: /sys/bus/iio/devices/.../out_altvoltageX_outY_wavetype +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Specifies the output waveform. + (sine, triangle, ramp, square, ...) + For a list of available output waveform options read + available_output_modes. + +What: /sys/bus/iio/devices/.../out_altvoltageX_outY_wavetype_available +KernelVersion: 2.6.37 +Contact: linux-iio@vger.kernel.org +Description: + Lists all available output waveform options. |