Hello,
I'm trying to use Edgeport sensors on my Openwrt router (Atheros MIPS CPU
with 3.3.8 kernel). It does not work and I have enabled debug output below:
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.170000] usb 1-1: new full-speed
USB device number 10 using ehci-platform
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.460000] io_ti 1-1:1.0:
Edgeport TI 1 port adapter converter detected
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.470000]
drivers/usb/serial/io_ti.c: choose_config - Number of Interfaces = 1
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.480000]
drivers/usb/serial/io_ti.c: choose_config - MAX Power = 80
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.490000]
drivers/usb/serial/io_ti.c: download_fw - RUNNING IN DOWNLOAD MODE
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.490000]
drivers/usb/serial/io_ti.c: read_download_mem - @ 0 for 1
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.510000]
drivers/usb/serial/io_ti.c: read_download_mem - @ 2 for 4
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.510000]
drivers/usb/serial/io_ti.c: read_download_mem - @ 2 for 4
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.530000] usb 1-1:
read_download_mem - length = 4, data = 06 e4 c9 fb
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.530000]
drivers/usb/serial/io_ti.c: check_i2c_image - structure too big,
erroring out.
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.540000]
drivers/usb/serial/io_ti.c: download_fw - DOWNLOAD MODE -- BAD I2C
Feb 11 20:28:42 10.0.0.254 kernel: [5650055.550000] io_ti: probe of
1-1:1.0 failed with error -5
When I plug the sensor on my x86 server, it works:
...
Feb 11 20:13:35 red kernel: [801958.038659]
/build/linux-vnts0_/linux-3.2.54/drivers/usb/serial/io_ti.c:
download_fw - RUNNING IN DOWNLOAD MODE
Feb 11 20:13:35 red kernel: [801958.038664]
/build/linux-vnts0_/linux-3.2.54/drivers/usb/serial/io_ti.c:
read_download_mem - @ 0 for 1
Feb 11 20:13:35 red kernel: [801958.043284]
/build/linux-vnts0_/linux-3.2.54/drivers/usb/serial/io_ti.c:
read_download_mem - @ 2 for 4
Feb 11 20:13:35 red kernel: [801958.043292]
/build/linux-vnts0_/linux-3.2.54/drivers/usb/serial/io_ti.c:
read_download_mem - @ 2 for 4
Feb 11 20:13:35 red kernel: [801958.047275] usb 3-1:
read_download_mem - length = 4, data = 01 09 00 b0
Feb 11 20:13:35 red kernel: [801958.047288]
/build/linux-vnts0_/linux-3.2.54/drivers/usb/serial/io_ti.c:
check_i2c_image Type =0x1
Feb 11 20:13:35 red kernel: [801958.047294]
/build/linux-vnts0_/linux-3.2.54/drivers/usb/serial/io_ti.c:
read_download_mem - @ 6 for 9
...
...
And the rest of the init continues properly.
I've created a little libusb perl script to debug the device, and found that
I could simulate the MIPS bug if I would send a read_download_mem address in
LE format instead of BE, e.g.:
$dev->control_msg((64 + 0 + 128), 0x92 , 0x82, 0x200, $bytes, 4, 1000);
=> OK returns 01 09 00 b0
$dev->control_msg((64 + 0 + 128), 0x92 , 0x82, 0x0002, $bytes, 4, 1000);
=> BAD returns 06 e4 c9 fb
In the io_ti driver, in read_download_mem(), we have:
be_start_address = cpu_to_be16(start_address);
status = ti_vread_sync(dev, UMPC_MEMORY_READ,
(__u16)address_type,
(__force __u16)be_start_address,
buffer, read_length);
Of course cpu_to_be16() has no effect on MIPS BE, and that's the cause of
the bug.
I don't know if it should be replaced with a swab16() or something else, I'm
not a kernel expert :) and there are a few other lines to fix.
Would could fix this bug, or would give me some advice on how to fix it?
Best regards,
--
L.Drolez.
http://www.aopensource.com - The Android Open Source Portal
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