mirror of
https://github.com/koreader/koreader
synced 2024-11-13 19:11:25 +00:00
9c8e55b3e5
* Notification: Drop the fencing from #10083; it never actually helped, and had subtle side-effects we could do without. * VirtualKeyBoard: Flash on close, otherwise, some of the fast refresh glitches may be burned into the working buffer until a flash. Making sure we flash ourselves prevent it from sticking around on the page ;). * util: Move `writeToSysfs` to base (i.e., `ffi/util`), as we need it there (and it actually makes more sense there anyway ;p). * Bump base for https://github.com/koreader/koreader-base/pull/1645, which is where the actual workaround (hopefully) lives. Re #8414, #9806, #10558
135 lines
4.3 KiB
Lua
135 lines
4.3 KiB
Lua
-- Generic frontlight SysFS interface.
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-- This also supports the natural light, which consists of additional
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-- red and green light LEDs.
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local dbg = require("dbg")
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local ffiUtil = require("ffi/util")
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local SysfsLight = {
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frontlight_white = nil,
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frontlight_red = nil,
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frontlight_green = nil,
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frontlight_mixer = nil,
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frontlight_ioctl = nil,
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nl_min = nil,
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nl_max = nil,
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nl_inverted = nil,
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current_brightness = 0,
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current_warmth = 0,
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white_gain = 25,
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red_gain = 24,
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green_gain = 24,
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white_offset = -25,
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red_offset = 0,
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green_offset = -65,
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exponent = 0.25,
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}
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function SysfsLight:new(o)
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o = o or {}
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setmetatable(o, self)
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self.__index = self
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if o.init then o:init() end
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return o
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end
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function SysfsLight:setBrightness(brightness)
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self:setNaturalBrightness(brightness, nil)
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end
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dbg:guard(SysfsLight, 'setBrightness',
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function(self, brightness)
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assert(brightness >= 0 and brightness <= 100,
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"Wrong brightness value given!")
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end)
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function SysfsLight:setWarmth(warmth)
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self:setNaturalBrightness(nil, warmth)
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end
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dbg:guard(SysfsLight, 'setWarmth',
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function(self, warmth)
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assert(warmth >= 0 and warmth <= 100,
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"Wrong warmth value given!")
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end)
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--- @note: warmth is already in the *native* scale!
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function SysfsLight:setNaturalBrightness(brightness, warmth)
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local set_brightness = true
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local set_warmth = true
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if not brightness then
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set_brightness = false
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brightness = self.current_brightness
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end
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if not warmth then
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set_warmth = false
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warmth = self.current_warmth
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end
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-- Newer devices use a mixer instead of writting values per color.
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if self.frontlight_mixer then
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if set_brightness then
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-- Prefer the ioctl, as it's much lower latency.
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if self.frontlight_ioctl then
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self.frontlight_ioctl:setBrightness(brightness)
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else
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ffiUtil.writeToSysfs(brightness, self.frontlight_white)
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end
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end
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-- The mixer might be using inverted values... (cold is nl_max, warm is nl_min)
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if set_warmth then
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if self.nl_inverted then
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ffiUtil.writeToSysfs(self.nl_max - warmth, self.frontlight_mixer)
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else
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ffiUtil.writeToSysfs(warmth, self.frontlight_mixer)
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end
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end
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else
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local red = 0
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local green = 0
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local white = 0
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if brightness > 0 then
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-- On Nickel, the values for white/red/green are roughly linearly dependent
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-- on the 4th root of brightness and warmth.
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white = math.min(self.white_gain * (brightness * (100 - warmth))^self.exponent + self.white_offset, 255)
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end
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if warmth > 0 then
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local brightness_warmth_exp = (brightness * warmth)^self.exponent
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red = math.min(self.red_gain * brightness_warmth_exp + self.red_offset, 255)
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green = math.min(self.green_gain * brightness_warmth_exp + self.green_offset, 255)
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end
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white = math.max(white, 0)
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red = math.max(red, 0)
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green = math.max(green, 0)
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self:_set_light_value(self.frontlight_white, math.floor(white))
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self:_set_light_value(self.frontlight_green, math.floor(green))
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self:_set_light_value(self.frontlight_red, math.floor(red))
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end
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self.current_brightness = brightness
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self.current_warmth = warmth
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end
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dbg:guard(SysfsLight, 'setNaturalBrightness',
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function(self, brightness, warmth)
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assert(brightness == nil or (brightness >= 0 and brightness <= 100),
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"Wrong brightness value given!")
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assert(warmth == nil or (warmth >= 0 and warmth <= 100),
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"Wrong warmth value given!")
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end)
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function SysfsLight:_set_light_value(sysfs_directory, value)
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if not sysfs_directory then return end
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-- bl_power is '31' when the light is turned on, '0' otherwise.
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if (value > 0) then
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ffiUtil.writeToSysfs(31, sysfs_directory .. "/bl_power")
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else
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ffiUtil.writeToSysfs(0, sysfs_directory .. "/bl_power")
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end
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ffiUtil.writeToSysfs(value, sysfs_directory .. "/brightness")
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end
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return SysfsLight
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