359 lines
11 KiB
Go
359 lines
11 KiB
Go
// Copyright 2016 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package chip
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"periph.io/x/periph"
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"periph.io/x/periph/conn/gpio"
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"periph.io/x/periph/conn/gpio/gpioreg"
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"periph.io/x/periph/conn/pin"
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"periph.io/x/periph/conn/pin/pinreg"
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"periph.io/x/periph/host/allwinner"
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"periph.io/x/periph/host/distro"
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"periph.io/x/periph/host/fs"
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)
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// C.H.I.P. hardware pins.
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var (
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TEMP_SENSOR = &pin.BasicPin{N: "TEMP_SENSOR"}
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PWR_SWITCH = &pin.BasicPin{N: "PWR_SWITCH"}
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// XIO "gpio" pins attached to the pcf8574 I²C port extender.
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XIO0, XIO1, XIO2, XIO3, XIO4, XIO5, XIO6, XIO7 gpio.PinIO
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)
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// The U13 header is opposite the power LED.
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//
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// The alternate pin functionality is described at pages 322-323 of
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// https://github.com/NextThingCo/CHIP-Hardware/raw/master/CHIP%5Bv1_0%5D/CHIPv1_0-BOM-Datasheets/Allwinner%20R8%20User%20Manual%20V1.1.pdf
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var (
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U13_1 = pin.GROUND //
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U13_2 = pin.DC_IN //
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U13_3 = pin.V5 // (filtered)
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U13_4 = pin.GROUND //
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U13_5 = pin.V3_3 //
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U13_6 = TEMP_SENSOR // Analog temp sensor input
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U13_7 = pin.V1_8 //
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U13_8 = pin.BAT_PLUS // External LiPo battery
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U13_9 = allwinner.PB16 // I2C1_SDA
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U13_10 = PWR_SWITCH // Power button
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U13_11 = allwinner.PB15 // I2C1_SCL
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U13_12 = pin.GROUND //
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U13_13 = allwinner.X1 // Touch screen X1
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U13_14 = allwinner.X2 // Touch screen X2
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U13_15 = allwinner.Y1 // Touch screen Y1
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U13_16 = allwinner.Y2 // Touch screen Y2
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U13_17 = allwinner.PD2 // LCD-D2; UART2_TX firmware probe for 1-wire to detect DIP at boot; http://docs.getchip.com/dip.html#dip-identification
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U13_18 = allwinner.PB2 // PWM0; EINT16
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U13_19 = allwinner.PD4 // LCD-D4; UART2_CTS
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U13_20 = allwinner.PD3 // LCD-D3; UART2_RX
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U13_21 = allwinner.PD6 // LCD-D6
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U13_22 = allwinner.PD5 // LCD-D5
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U13_23 = allwinner.PD10 // LCD-D10
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U13_24 = allwinner.PD7 // LCD-D7
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U13_25 = allwinner.PD12 // LCD-D12
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U13_26 = allwinner.PD11 // LCD-D11
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U13_27 = allwinner.PD14 // LCD-D14
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U13_28 = allwinner.PD13 // LCD-D13
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U13_29 = allwinner.PD18 // LCD-D18
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U13_30 = allwinner.PD15 // LCD-D15
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U13_31 = allwinner.PD20 // LCD-D20
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U13_32 = allwinner.PD19 // LCD-D19
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U13_33 = allwinner.PD22 // LCD-D22
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U13_34 = allwinner.PD21 // LCD-D21
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U13_35 = allwinner.PD24 // LCD-CLK
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U13_36 = allwinner.PD23 // LCD-D23
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U13_37 = allwinner.PD26 // LCD-VSYNC
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U13_38 = allwinner.PD27 // LCD-HSYNC
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U13_39 = pin.GROUND //
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U13_40 = allwinner.PD25 // LCD-DE: RGB666 data
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)
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// The U14 header is right next to the power LED.
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var (
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U14_1 = pin.GROUND //
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U14_2 = pin.V5 // (filtered)
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U14_3 = allwinner.PG3 // UART1_TX; EINT3
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U14_4 = allwinner.HP_LEFT // Headphone left output
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U14_5 = allwinner.PG4 // UART1_RX; EINT4
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U14_6 = allwinner.HP_COM // Headphone amp out
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U14_7 = allwinner.FEL // Boot mode selection
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U14_8 = allwinner.HP_RIGHT // Headphone right output
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U14_9 = pin.V3_3 //
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U14_10 = allwinner.MIC_GND // Microphone ground
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U14_11 = allwinner.KEY_ADC // LRADC Low res analog to digital
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U14_12 = allwinner.MIC_IN // Microphone input
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U14_13 = XIO0 // gpio via I²C controller
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U14_14 = XIO1 // gpio via I²C controller
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U14_15 = XIO2 // gpio via I²C controller
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U14_16 = XIO3 // gpio via I²C controller
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U14_17 = XIO4 // gpio via I²C controller
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U14_18 = XIO5 // gpio via I²C controller
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U14_19 = XIO6 // gpio via I²C controller
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U14_20 = XIO7 // gpio via I²C controller
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U14_21 = pin.GROUND //
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U14_22 = pin.GROUND //
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U14_23 = allwinner.PG1 // GPS_CLK; AP-EINT1
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U14_24 = allwinner.PB3 // IR_TX; AP-EINT3 (EINT17)
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U14_25 = allwinner.PB18 // I2C2_SDA
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U14_26 = allwinner.PB17 // I2C2_SCL
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U14_27 = allwinner.PE0 // CSIPCK: CMOS serial interface; SPI2_CS0; EINT14
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U14_28 = allwinner.PE1 // CSICK: CMOS serial interface; SPI2_CLK; EINT15
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U14_29 = allwinner.PE2 // CSIHSYNC; SPI2_MOSI
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U14_30 = allwinner.PE3 // CSIVSYNC; SPI2_MISO
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U14_31 = allwinner.PE4 // CSID0
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U14_32 = allwinner.PE5 // CSID1
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U14_33 = allwinner.PE6 // CSID2
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U14_34 = allwinner.PE7 // CSID3
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U14_35 = allwinner.PE8 // CSID4
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U14_36 = allwinner.PE9 // CSID5
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U14_37 = allwinner.PE10 // CSID6; UART1_RX
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U14_38 = allwinner.PE11 // CSID7; UART1_TX
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U14_39 = pin.GROUND //
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U14_40 = pin.GROUND //
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)
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// Present returns true if running on a NextThing Co's C.H.I.P. board.
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//
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// It looks for "C.H.I.P" in the device tree. The following information is
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// expected in the device dtree:
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// root@chip2:/proc/device-tree# od -c compatible
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// 0000000 n e x t t h i n g , c h i p \0 a
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// 0000020 l l w i n n e r , s u n 5 i - r
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// 0000040 8 \0
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// root@chip2:/proc/device-tree# od -c model
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// 0000000 N e x t T h i n g C . H . I .
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// 0000020 P . \0
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func Present() bool {
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return strings.Contains(distro.DTModel(), "C.H.I.P")
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}
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//
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// aliases is a list of aliases for the various gpio pins, this allows users to
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// refer to pins using the documented and labeled names instead of some GPIOnnn
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// name. The map key is the alias and the value is the real pin name.
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var aliases = map[string]string{
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"AP-EINT1": "PG1",
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"AP-EINT3": "PB3",
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"CSIPCK": "PE0",
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"CSIHSYNC": "PE2",
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"CSID0": "PE4",
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"CSID2": "PE6",
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"CSID4": "PE8",
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"CSID6": "PE10",
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"CSICK": "PE1",
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"CSIVSYNC": "PE3",
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"CSID1": "PE5",
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"CSID3": "PE7",
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"CSID5": "PE9",
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"CSID7": "PE11",
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"LCD-CLK": "PD24",
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"LCD-D10": "PD10",
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"LCD-D11": "PD11",
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"LCD-D12": "PD12",
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"LCD-D13": "PD13",
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"LCD-D14": "PD14",
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"LCD-D15": "PD15",
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"LCD-D18": "PD18",
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"LCD-D19": "PD19",
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"LCD-D2": "PD2",
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"LCD-D20": "PD20",
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"LCD-D21": "PD21",
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"LCD-D22": "PD22",
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"LCD-D23": "PD23",
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"LCD-D3": "PD3",
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"LCD-D4": "PD4",
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"LCD-D5": "PD5",
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"LCD-D6": "PD6",
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"LCD-D7": "PD7",
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"LCD-DE": "PD25",
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"LCD-HSYNC": "PD27",
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"LCD-VSYNC": "PD26",
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"TWI1-SCK": "PB15",
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"TWI1-SDA": "PB16",
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"TWI2-SCK": "PB17",
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"TWI2-SDA": "PB18",
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"UART1-RX": "PG4",
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"UART1-TX": "PG3",
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}
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func init() {
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// These are initialized later by the driver.
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XIO0 = gpio.INVALID
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XIO1 = gpio.INVALID
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XIO2 = gpio.INVALID
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XIO3 = gpio.INVALID
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XIO4 = gpio.INVALID
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XIO5 = gpio.INVALID
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XIO6 = gpio.INVALID
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XIO7 = gpio.INVALID
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// These must be reinitialized.
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U14_13 = XIO0
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U14_14 = XIO1
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U14_15 = XIO2
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U14_16 = XIO3
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U14_17 = XIO4
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U14_18 = XIO5
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U14_19 = XIO6
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U14_20 = XIO7
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}
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// findXIOBase calculates the base of the XIO-P? gpio pins as explained in
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// http://docs.getchip.com/chip.html#kernel-4-3-vs-4-4-gpio-how-to-tell-the-difference
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//
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// The XIO-P? sysfs mapped pin number changed in kernel 4.3, 4.4.11 and again
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// in 4.4.13 so it is better to query sysfs.
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func findXIOBase() int {
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chips, err := filepath.Glob("/sys/class/gpio/gpiochip*/label")
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if err != nil {
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return -1
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}
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for _, item := range chips {
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f, err := fs.Open(item, os.O_RDONLY)
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if err != nil {
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continue
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}
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b, err := ioutil.ReadAll(f)
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if err1 := f.Close(); err == nil {
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err = err1
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}
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if err != nil {
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continue
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}
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if string(b) == "pcf8574a\n" {
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id, err := strconv.Atoi(filepath.Base(filepath.Dir(item))[8:])
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if err != nil {
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return -1
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}
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return id
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}
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}
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return -1
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}
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// driver implements drivers.Driver.
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type driver struct {
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}
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func (d *driver) String() string {
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return "chip"
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}
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func (d *driver) Prerequisites() []string {
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return nil
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}
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func (d *driver) After() []string {
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// has allwinner cpu, needs sysfs for XIO0-XIO7 "gpio" pins
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return []string{"allwinner-gpio", "sysfs-gpio"}
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}
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func (d *driver) Init() (bool, error) {
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if !Present() {
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return false, errors.New("NextThing Co. CHIP board not detected")
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}
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base := findXIOBase()
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if base == -1 {
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return true, errors.New("couldn't find XIO pins base number")
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}
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for i := 0; i < 8; i++ {
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aliases[fmt.Sprintf("XIO-P%d", i)] = fmt.Sprintf("GPIO%d", base+i)
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}
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// At this point the sysfs driver has initialized and discovered its pins,
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// we can now hook-up the appropriate CHIP pins to sysfs gpio pins.
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for alias, real := range aliases {
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if err := gpioreg.RegisterAlias(alias, real); err != nil {
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return true, err
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}
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}
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// These must be explicitly initialized.
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XIO0 = gpioreg.ByName("XIO-P0")
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XIO1 = gpioreg.ByName("XIO-P1")
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XIO2 = gpioreg.ByName("XIO-P2")
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XIO3 = gpioreg.ByName("XIO-P3")
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XIO4 = gpioreg.ByName("XIO-P4")
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XIO5 = gpioreg.ByName("XIO-P5")
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XIO6 = gpioreg.ByName("XIO-P6")
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XIO7 = gpioreg.ByName("XIO-P7")
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U14_13 = XIO0
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U14_14 = XIO1
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U14_15 = XIO2
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U14_16 = XIO3
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U14_17 = XIO4
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U14_18 = XIO5
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U14_19 = XIO6
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U14_20 = XIO7
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// U13 is one of the 20x2 connectors.
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U13 := [][]pin.Pin{
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{U13_1, U13_2},
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{U13_3, U13_4},
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{U13_5, U13_6},
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{U13_7, U13_8},
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{gpioreg.ByName("TWI1-SDA"), U13_10},
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{gpioreg.ByName("TWI1-SCK"), U13_12},
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{U13_13, U13_14},
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{U13_15, U13_16},
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{gpioreg.ByName("LCD-D2"), gpioreg.ByName("PWM0")},
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{gpioreg.ByName("LCD-D4"), gpioreg.ByName("LCD-D3")},
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{gpioreg.ByName("LCD-D6"), gpioreg.ByName("LCD-D5")},
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{gpioreg.ByName("LCD-D10"), gpioreg.ByName("LCD-D7")},
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{gpioreg.ByName("LCD-D12"), gpioreg.ByName("LCD-D11")},
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{gpioreg.ByName("LCD-D14"), gpioreg.ByName("LCD-D13")},
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{gpioreg.ByName("LCD-D18"), gpioreg.ByName("LCD-D15")},
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{gpioreg.ByName("LCD-D20"), gpioreg.ByName("LCD-D19")},
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{gpioreg.ByName("LCD-D22"), gpioreg.ByName("LCD-D21")},
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{gpioreg.ByName("LCD-CLK"), gpioreg.ByName("LCD-D23")},
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{gpioreg.ByName("LCD-VSYNC"), gpioreg.ByName("LCD-HSYNC")},
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{U13_39, gpioreg.ByName("LCD-DE")},
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}
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if err := pinreg.Register("U13", U13); err != nil {
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return true, err
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}
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// U14 is one of the 20x2 connectors.
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U14 := [][]pin.Pin{
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{U14_1, U14_2},
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{gpioreg.ByName("UART1-TX"), U14_4},
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{gpioreg.ByName("UART1-RX"), U14_6},
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{U14_7, U14_8},
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{U14_9, U14_10},
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{U14_11, U14_12}, // TODO(maruel): switch to LRADC once analog support is added
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{U14_13, U14_14},
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{U14_15, U14_16},
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{U14_17, U14_18},
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{U14_19, U14_20},
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{U14_21, U14_22},
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{gpioreg.ByName("AP-EINT1"), gpioreg.ByName("AP-EINT3")},
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{gpioreg.ByName("TWI2-SDA"), gpioreg.ByName("TWI2-SCK")},
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{gpioreg.ByName("CSIPCK"), gpioreg.ByName("CSICK")},
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{gpioreg.ByName("CSIHSYNC"), gpioreg.ByName("CSIVSYNC")},
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{gpioreg.ByName("CSID0"), gpioreg.ByName("CSID1")},
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{gpioreg.ByName("CSID2"), gpioreg.ByName("CSID3")},
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{gpioreg.ByName("CSID4"), gpioreg.ByName("CSID5")},
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{gpioreg.ByName("CSID6"), gpioreg.ByName("CSID7")},
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{U14_39, U14_40},
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}
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return true, pinreg.Register("U14", U14)
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}
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func init() {
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if isArm {
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periph.MustRegister(&drv)
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}
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}
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var drv driver
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