[gpio] how to modify / display GPIO status through ADB shell

1. Show GPIO state :

1.1 MT6983 after (kernel-5.10) The format is as follows

cat proc/mtk_gpio/soc.pinctrl

Same format MT6885 after , Note that reading requires root jurisdiction

1.2 MT6885 The following format is shown

cat /sys/devices/platform/pinctrl/mt_gpio
PIN: (MODE)(DIR)(DOUT)(DIN)(DRIVE)(SMT)(IES)(PULL_EN)(PULL_SEL)(R1 R0)

for example (kernel-4.14 DRIVE The column width is 2, List the others 1, other kernel Version column width is 1, Pay attention to correspondence )：

cat sys/devices/platform/pinctrl/mt_gpio

pins base: 285, pins count: 227
PIN: (MODE)(DIR)(DOUT)(DIN)(DRIVE)(SMT)(IES)(PULL_EN)(PULL_SEL)(R1 R0)
000: 0001001111
001: 0000001110
002: 0000001110
…

NOTE：

For each platform mt_gpio There may be differences in the paths of , You can use the following command to find

adb shell

find sys/ -name “mt_gpio”

for example ：mt6763 platform

find sys/ -name “mt_gpio” Output is as follows

sys/devices/platform/10005000.pinctrl/mt_gpio

1.3 MT6763 The following format is shown

cat /sys/devices/platform/XXX.pinctrl/mt_gpio //XXX.pinctrl It's platform specific

PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )

for example ：mt6763 platform

adb shell “cat /sys/devices/platform/10005000.pinctrl/mt_gpio” Output is as follows ：

PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] )

0: 000111110

1: 010000110

2: 000010110

…

1.4 Older platforms

cd /sys/class/misc/mtgpio perhaps cd /sys/devices/virtual/misc/mtgpio

cat pins

A、 If show The format is xx: x x x x x x x x （ The colon is followed by 8 A digital ）

The corresponding meanings are as follows ：

PIN: [MODE] [PULL_SEL] [DIN] [DOUT] [PULL_EN] [DIR] [IES] [SMT]

B、 If show The format is xx: x x x x x x x （ The colon is followed by 7 A digital ） // some kernel-3.10

The corresponding meanings are as follows ：

PIN: [MODE] [PULL_SEL] [DOUT] [PULL_EN] [DIR] [IES]

2. Meaning of each description item

PIN IO Number

[MODE] At present pin In mode

[DIR] 0：input pin, 1：output pin

[DOUT] Output value

[DIN] The input values

[PULL_EN] Only right input pin It works , Enable up / The drop-down

[PULL_SEL] Only right input pin It works ,1： Pull up 0： The drop-down

[IES] Input enable ,1：input Signal valid 0：input Invalid signal

[SMT] Enable Schmitt trigger

[DRIVE] Driving ability , Generally, it can be taken as 0～7

([R1] [R0]) At present GPIO pin Of （ Up and down ） Enable state of parallel resistance

1 0 Express enable R1,disable R0

0 1 Express disable R1,enable R0

1 1 Express enable R1, enable R0

Don't print it out , Represents the current GPIO pin I won't support it PUPD condition , That is, there is only one pull-up resistor 、 A pull-down resistor

DTS Settings related issues in ：

Support PUPD Of GPIO pin Set up , give an example ：

bias-pull-up=<MTK_PUPD_SET_R1R0_01>// Pull up R0

bias-pull-down=<MTK_PUPD_SET_R1R0_10> // The drop-down R1

bias-disabled;// Neither pull up nor pull down

I won't support it PUPD Of GPIO pin Set up , give an example ：

bias-pull-up;// Pull up

bias-pull-down;// The drop-down

bias-disabled;// Neither pull up nor pull down

3. Set up GPIO state :

3.1 MT6885(kernel-4.14)：

The setting method is the same as MT6885 identical , Write in the same way after changing permissions proc/mtk_gpio/soc.pinctrl that will do .

3.2 MT6885(kernel-4.14)：

Set command and MT6779 equally , But pay attention to mt_gpio The node attribute is read-only , as follows ,

       -r--r--r-- 1 root root 4096 2019-07-01 08:20 sys/devices/platform/pinctrl/mt_gpio

Before setting , need root(user Version not available root jurisdiction ) after ,chmod 0664 mt_gpio Change node properties .

3.3 MT6768,MT6779：

Single set command ：
echo [option] $pin_num $value > /sys/devices/platform/pinctrl/mt_gpio

[option] Indicates the status to be set , Optional value ：mode,dir,out,pullen,pullsel,ies,smt,driving

$pin_num Represents the setting of gpio Number
$value Indicates the value to be written

for example ：

echo mode 99 6 > /sys/devices/platform/pinctrl/mt_gpio
echo dir 99 1 > /sys/devices/platform/pinctrl/mt_gpio
echo out 99 1 > /sys/devices/platform/pinctrl/mt_gpio
echo pullen 99 1 > /sys/devices/platform/pinctrl/mt_gpio

NOTE： Set up pullen when ,
For pin with 2 pull resistors, $value can be 0 (R1=0, R0=0), 1 (R1=0, R0=1), 2 (R1=1, R0=0), 3 (R1=1, R0=1)
For pin with 1 pull resistor, $value can be 0 or 1

Set all commands at once ：

echo set $pin_num $mode $dir $dout $din $driving $smt $ies $pullen $pullsel > /sys/devices/platform/pinctrl/mt_gpio

echo set $pin_num $mode $dir $dout $din $driving $smt $ies $pullen $pullsel $r1 $r0 > /sys/devices/platform/pinctrl/mt_gpio

NOTE：

Set all attributes in a single command
Note1: all attributes shall not be separated with space
Note2: all attributes is 1 digit except $driving is 2 digits
Note3: din cannot be changed, $din is leaved here for convenience of command typing. Therefore, user can change fields from read string (obtained via cat mt_gpio) without removing $din

3.4 MT6763 Settings after ：

Single set command （ Refer to the above description ）：

echo mode $pin_num $value > /sys/devices/platform/10005000.pinctrl/mt_gpio

echo dir $pin_num $value > /sys/devices/platform/10005000.pinctrl/mt_gpio

echo dout $pin_num $value > /sys/devices/platform/10005000.pinctrl/mt_gpio

echo pullen $pin_num $value > /sys/devices/platform/10005000.pinctrl/mt_gpio
For pin with 2 pull resistors, $value can be 0 (R1=0, R0=0), 1 (R1=0, R0=1), 2 (R1=1, R0=0), 3 (R1=1, R0=1)
For pin with 1 pull resistor, $value can be 0 or 1

echo pullsel $pin_num $value > /sys/devices/platform/10005000.pinctrl/mt_gpio

One time settings are as follows ：

echo set $pin_num $mode $dir $dout $din $pullen $pullsel $ies $smt $driving > /sys/devices/platform/10005000.pinctrl/mt_gpio

echo set $pin_num $mode $dir $dout $din $pullen $pullsel $ies $smt $driving $r1 $r0 > /sys/devices/platform/10005000.pinctrl/mt_gpio

Set all attributes in a single command
Note1: all all attributes shall not be separated with space
Note2: din cannot be changed, $din is leaved here for convenience of command typing. Therefore, user can change fields from read string (obtained via cat mt_gpio) without removing $din

for example ：

Set up GPIO99 mode 3

#echo mode 99 3 > mt_gpio

Set up GPIO99 dir out

#echo dir 99 1 > mt_gpio

Set up GPIO99 dir in

#echo dir 99 0 > mt_gpio

…

MT6763 Set all at once ：

#echo set 99 000011110 > /sys/devices/platform/10005000.pinctrl/mt_gpio

3.5 Settings for older platforms ：

Set separately GPIO One of the information of is as follows ：

echo -wmode num x > pin //num: pin number x: the mode 0~7
echo -wpsel num x > pin //x: 1,pull up; 0,pull down
echo -wdout num x > pin //x:1,high; 0,low
echo -wpen num x > pin //x: 1,pull enable; 0,pull disable
echo -wies num x > pin //x: 1,ies enable; 0, ies disable
echo -wdir num x > pin //x: 1,output; 0,input

One time settings GPIO All item values of are as follows ：

echo -w=num:x x x x x x x > pin //x： [MODE] [PSEL] [DOUT] [PEN] [DIR] [IES] [SMT]
Like some of the above kenrel-3.10 Can only show Come out now pin Of 7 A number of GPIO One time settings for GPIO Values
echo -w=num:x x x x x x > pin //x: [MODE] [PSEL] [DOUT] [PEN] [DIR] [IES]

for example ：

adb shell “echo “-w=99:0 1 0 0 0 1 0” >/sys/devices/virtual/misc/mtgpio/pin”