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EC_CMD_PWM_SET_DUTY / EC_CMD_PWM_GET_DUTY were recently added and are not yet in use. Future-proof these commands by taking a 16-bit duty cycle parameter and converting it between the [0-100] percent used by internal EC functions. BUG=chromium:615109 BRANCH=None TEST=Manual on chell. `ectool pwmsetduty kb 65535` - Verify KB backlight goes to 100% `ectool pwmgetduty kb` - Prints 65535 `ectool pwmgetduty 0` - Prints 65535 `ectool pwmsetduty 0 0` - Verify KB backlight goes to 0% `ectool pwmgetduty kb` - Prints 0 `ectool pwmgetduty disp` - Error res 3 (unsupported PWM type) `ectool pwmsetduty 1` - Error res 3 (non-existent PWM index) `ectool pwmsetduty kb 6550` + `ectool pwmgetduty kb` - Prints 6553 (round up) `ectool pwmsetduty kb 6560` + `ectool pwmgetduty kb` - Prints 6553 (round down) Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: Ic6996fc6e1e69359274b2f9a1120ee7002db991c Reviewed-on: https://chromium-review.googlesource.com/347608 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Tested-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Brian Norris <briannorris@chromium.org>