This commit overhauls the CC1101 RF driver to address physical hardware
constraints, prevent register wrap-around overflows, and support accurate
dBm power scaling via the standard IOCTL interface.
What this change does:
1. Adds WLIOC_MSK and WLIOC_4FSK modulation support in `ioctl.h` and driver.
2. Replaces static PATABLE initialization with a dynamic Ramp-up curve
generator `cc1101_ioctl_apply_power()` based on lab calibration data.
3. Modifies WLIOC_SETTXPOWER and WLIOC_GETTXPOWER to process actual dBm
values with a nearest-match algorithm instead of raw array indices.
4. Removes DEBUGASSERT on user-space IOCTL pointers and replaces them
with strict -EFAULT checks.
5. Implements saturation clamping (e.g., mantissa to 256-511) to prevent
bitrate and frequency deviation calculation overflows.
6. Rebuilds volatile PATABLE memory upon SLEEP mode wake-up.
Why it is necessary & what it fixes:
- Fixes severe OOK modulation distortion and FSK spectral splatter caused
by statically assigned PATABLE indices.
- Fixes potential kernel panic in flat builds when IOCTL receives a NULL
pointer from user space.
- Fixes register wrap-around (silent failures) when users pass
out-of-bounds baud rate or FDEV values.
- Prevents RF silence after SLEEP mode due to PATABLE volatility.
- Resolves inaccurate power output when changing frequencies dynamically.
Impact:
Changes the behavior of CC1101 TX power and modulation IOCTLs to strictly
comply with standard `wlioc` definitions. Improves overall driver stability
and hardware safety.
Signed-off-by: Chip L. <chplee@gmail.com>
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