w1-gpio?

smilfinken
 
Posts: 1
Joined: Wed Feb 04, 2015 9:22 am

w1-gpio?

Wed Feb 04, 2015 9:31 am

Hi!

I've been trying to get my vocore to read from a 1-wire temperature sensor (DS18B20), but I'm unable to successfully load the kernel modules for this. Is there a trick or setting I am unaware of to make this work?

I'm currently using a default 14.07 openwrt image (I've also tried using trunk and a custom 14.07 with the relevant modules compiled in), the kernel modules specifically loaded are wire, w1-gpio, w1-therm and w1-gpio-custom. When loading w1-gpio-custom I get an error like so:

Code: Select all
[   15.690000] w1-gpio w1-gpio.0: no of_node; not parsing pinctrl DT
[   15.690000] w1-gpio w1-gpio.0: no of_node; not parsing pinctrl DT
[   15.690000] w1-gpio w1-gpio.0: unable to select pin group
[   15.700000] ------------[ cut here ]------------
[   15.710000] WARNING: at drivers/gpio/gpiolib.c:126 gpio_to_desc+0x2c/0x54()
[   15.730000] invalid GPIO -2
[   15.730000] Modules linked in: w1_gpio(+) rt2x00soc rt2x00mmio rt2x00lib pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv4 mac8n
[   15.870000] CPU: 0 PID: 528 Comm: kmodloader Not tainted 3.10.49 #3
[   15.880000] Stack : 00000000 00000000 00000000 00000000 8032afbe 00000037 818c2fb8 80320000
[   15.880000]    802789ac 802bab73 00000210 80323820 818c2fb8 80320000 00000000 00000011
[   15.880000]    00000124 8021b168 00000003 801836c4 80288f1c 80320000 8027a004 80c2fc14
[   15.880000]    00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   15.880000]    00000000 00000000 00000000 00000000 00000000 00000000 00000000 80c2fba0
[   15.880000]    ...
[   15.950000] Call Trace:
[   15.960000] [<801c077c>] show_stack+0x48/0x70
[   15.960000] [<8022b98c>] warn_slowpath_common+0x78/0xa8
[   15.970000] [<8022b9e8>] warn_slowpath_fmt+0x2c/0x38
[   15.980000] [<800ed294>] gpio_to_desc+0x2c/0x54
[   15.990000] [<800ecbe4>] gpio_request+0x14/0x2c
[   16.000000] [<80dbe220>] 0x80dbe220
[   16.010000]
[   16.010000] ---[ end trace 496087b69f973b04 ]---
[   16.020000] gpiod_request: invalid GPIO
[   16.030000] w1-gpio w1-gpio.0: gpio_request (pin) failed
[   16.040000] w1-gpio: probe of w1-gpio.0 failed with error -22


I've connected the sensor to the GPIO 00 pin, and supplied these parameters to the module:
Code: Select all
w1-gpio-custom bus0=0,0,0


Any ideas, please?

Vonger
 
Posts: 721
Joined: Sun Oct 19, 2014 6:00 am

Re: w1-gpio?

Thu Feb 19, 2015 9:27 am

Such problem might caused by driver.
Looks like the GPIO setting/dts is not correct.

szkrisz
 
Posts: 2
Joined: Fri Jan 08, 2016 12:52 pm

Re: w1-gpio?

Thu Jan 14, 2016 2:07 pm

Hi.

Did you solve the problem? I have a similar issue with it.

Thank You!

Vonger
 
Posts: 721
Joined: Sun Oct 19, 2014 6:00 am

Re: w1-gpio?

Sun Jan 17, 2016 8:28 am

szkrisz wrote:Hi.

Did you solve the problem? I have a similar issue with it.

Thank You!


I think the most simple way is to use an already exported GPIO in VoCore.
Please check VOCORE.dts in openwrt source code for the exported GPIO.

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