Re: [PATCH v2 2/2] hwmon: (asus_rog_ryujin) Add pwm1_enable for the Ryujin III pump

[Guenter Roeck <linux@roeck-us.net>]

On Mon, Sep 28, 2026 at 07:41:06AM -0400, Zac Lanzon wrote:
> Once pwm1 has been written, nothing in the driver hands the RYUJIN III
> pump back to its internal controller, and user space cannot tell which
> source controls the pump.
> 
> Expose the pump control source as pwm1_enable, read from the cooler
> duty report: 1 when the pump follows pwm1, 2 when it is handed to its
> internal controller, which follows the PWM of the header its 4-pin
> cable is plugged into. Writing 2 sends the reported duties with source
> 0, and writing 1 sends them with source 1, with the same neighbouring
> duty write as pwm1. Other values return -EINVAL. Writing pwm1 still
> selects source 1. The attribute is not created for the RYUJIN II.
> 
> With changes in both directions, source changes can follow each other
> closely. The cooler ignored a source change sent 500 ms or less after
> the previous one (7 of 7 trials) and applied one sent 1 s or more after
> it (5 of 5). Its duty report showed a change within 1.1 s of the
> command in every trial. So a write that changes the source now waits
> until 1 s has passed since the previous change, then polls the duty
> report every 100 ms until it shows the new source, and fails with
> -ETIMEDOUT after 2 s. pump_source is only taken from the report. Other
> writes are unaffected.
> 
> Measured on a RYUJIN III 360 (firmware AURJ2-S750-0108) with the pump
> cable on AIO_PUMP and the header PWM set through nct6775 (pump rpm):
> 
>                                      header 50%  header 80%  pwm1_enable
>   driver loaded, internal controller    2160        3090          2
>   pwm1 = 40%                            1725        1740          1
>   pwm1_enable = 2                       2130        3090          2
>   pwm1_enable = 1                       1740        1740          1
>   pwm1_enable = 2, then pwm1 = 60%      2475                      1
>   driver reloaded, pump on USB          1740        1740          1
> 
> Written back to back, each source change took 0.95 to 1.07 s, and the
> sequences ended as requested in 2 of 2 runs each: pwm1_enable = 2 then
> pwm1 = 60% with the pump at 60% on USB, pwm1_enable = 1, 2, 1 on USB,
> and pwm1 = 60% then pwm1_enable = 2 on the internal controller.
> 
> From power-on (measured with v1 of this patch; v2 changes only how the
> wait is computed, and the first source change after loading never
> waits), with the header at 100%, pwm1_enable read 2, read 1 after
> pwm1 = 40% (pump at 1710 rpm), and writing 2 handed the pump back to
> its internal controller (3585 rpm).
> 
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Zac Lanzon <lanzonza@gmail.com>

Applied.

Thanks,
Guenter