diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-driver-intc_sar')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-intc_sar | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-intc_sar b/Documentation/ABI/testing/sysfs-driver-intc_sar new file mode 100644 index 000000000000..ec334b0e5ed9 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intc_sar @@ -0,0 +1,54 @@ +What: /sys/bus/platform/devices/INTC1092:00/intc_reg +Date: August 2021 +KernelVersion: 5.15 +Contact: Shravan S <s.shravan@intel.com>, + An Sudhakar <sudhakar.an@intel.com> +Description: + Specific Absorption Rate (SAR) regulatory mode is typically + derived based on information like mcc (Mobile Country Code) and + mnc (Mobile Network Code) that is available for the currently + attached LTE network. A userspace application is required to set + the current SAR regulatory mode on the Dynamic SAR driver using + this sysfs node. Such an application can also read back using + this sysfs node, the currently configured regulatory mode value + from the Dynamic SAR driver. + + Acceptable regulatory modes are: + == ==== + 0 FCC + 1 CE + 2 ISED + == ==== + + - The regulatory mode value has one of the above values. + - The default regulatory mode used in the driver is 0. + +What: /sys/bus/platform/devices/INTC1092:00/intc_data +Date: August 2021 +KernelVersion: 5.15 +Contact: Shravan S <s.shravan@intel.com>, + An Sudhakar <sudhakar.an@intel.com> +Description: + This sysfs entry is used to retrieve Dynamic SAR information + emitted/maintained by a BIOS that supports Dynamic SAR. + + The retrieved information is in the order given below: + - device_mode + - bandtable_index + - antennatable_index + - sartable_index + + The above information is sent as integer values separated + by a single space. This information can then be pushed to a + WWAN modem that uses this to control the transmit signal + level using the Band/Antenna/SAR table index information. + These parameters are derived/decided by aggregating + device-mode like laptop/tablet/clamshell etc. and the + proximity-sensor data available to the embedded controller on + given host. The regulatory mode configured on Dynamic SAR + driver also influences these values. + + The userspace applications can poll for changes to this file + using POLLPRI event on file-descriptor (fd) obtained by opening + this sysfs entry. Application can then read this information from + the sysfs node and consume the given information. |