1 Emulator for DELL0501 UART attached backlight
2 ----------------------------------------------
3
4 Dell All In One (AIO) models released after 20
5 board connected to an UART.
6
7 In DSDT this uart port will be defined as:
8
9 Name (_HID, "DELL0501")
10 Name (_CID, EisaId ("PNP0501")
11
12 With the DELL0501 indicating that we are deali
13 the backlight controller board attached.
14
15 This small emulator allows testing
16 the drivers/platform/x86/dell/dell-uart-backli
17 to an actual Dell All In One.
18
19 This requires:
20 1. A (desktop) PC with a 16550 UART on the mot
21 connector connected to this UART.
22 2. A DB9 NULL modem cable.
23 3. A second DB9 serial port, this can e.g. be
24 with a DB9 connector plugged into the same
25 4. A DSDT overlay for the desktop PC replacing
26 ACPI Device() with "DELL0501" and adding a
27 DSDT.patch for an example of the necessary
28
29 With everything setup and the NULL modem cable
30 the 2 serial ports run:
31
32 ./dell-uart-backlight-emulator <path-to-/dev/t
33
34 For example when using an USB to serial conver
35
36 ./dell-uart-backlight-emulator /dev/ttyUSB0
37
38 And then (re)load the dell-uart-backlight driv
39
40 sudo rmmod dell-uart-backlight; sudo modprobe
41
42 After this check "dmesg" to see if the driver
43 the firmware version string from the emulator.
44 should be a /sys/class/backlight/dell_uart_bac
45 and writes to the brightness or bl_power files
46 by matching output from the emulator.
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