| Date | Sat, 21 Dec 2019 19:20:57 +0100 | From | Pavel Machek <> | Subject | Re: [RFC 00/25] arm64: realtek: Add Xnano X5 and implement TM1628/FD628/AiP1618 LED controllers |
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Hi!
> This patch series implements the LED controllers found in some RTD1295 based > TV set-top boxes. > > Ever since I've had mainline Linux kernels booting on my Zidoo X9S TV box, > it's been bugging me that it kept displaying "boot" on its front display. > A hot lead was a TM1628 chip on the front display's daughterboard, which > English and Chinese datasheets were available for. The biggest > hurdle
Fun :-).
> It goes on to add a "text" attribute to the driver that enables DT-configured > seven-segment displays; I was expecting to find precedence in auxdisplay > subsystem but came up empty. So my driver currently integrates its own > generic (but incomplete) character-to-8-segments mapping, as well as in a > second step a combined-characters-to-8-segments mapping, which then gets > mapped to the chipset's available output lines. Doing this as sysfs > device
I did not investigate this in great detail; but if it is displaying characters, auxdisplay is probably right subsystem to handle that. I guess LEDs can still take the low-level parts...
Oh, and common dimming for many LEDs is seen on other hardware, too (Turris routers). Not sure how to handle that, either :-(.
Best regards, Pavel
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