Hello Mr. Harbaum, First of all thanks for the feedback. You did a great job by developing this interface! The PCB is home made but the hardware on the i2c - bus is working perfectly with an ELV Parport interface on a different machine with suse 10.3. I tried to migrate the system to a low power consumption system. The interface is also ported from the tiny to a mega32 and connected to an active powered usb hub. I can see several disconnects and this error occurs directly after an reconnect: This is the actual syslog message: Feb 16 06:25:08 fhz kernel: [43029038.330000] i2c-adapter i2c-1: failure reading status Feb 16 06:25:08 fhz kernel: [43029038.430000] hub 1-1:1.0: port 1 disabled by hub (EMI?), re-enabling... Feb 16 06:25:08 fhz kernel: [43029038.440000] usb 1-1.1: USB disconnect, address 9 Feb 16 06:25:08 fhz kernel: [43029038.530000] usb 1-1.1: new low speed USB device using ehci_hcd and address 10 Feb 16 06:25:08 fhz kernel: [43029038.650000] usb 1-1.1: configuration #1 chosen from 1 choice Feb 16 06:25:08 fhz kernel: [43029038.660000] i2c-tiny-usb 1-1.1:1.0: version 2.05 found at bus 001 address 010 Feb 16 06:25:08 fhz kernel: [43029038.690000] i2c-adapter i2c-1: connected i2c-tiny-usb device Feb 16 06:25:08 fhz kernel: [43029038.690000] usb 1-1.1: New USB device found, idVendor=0403, idProduct=c631 Feb 16 06:25:08 fhz kernel: [43029038.700000] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Feb 16 06:25:08 fhz kernel: [43029038.710000] usb 1-1.1: Product: i2c-tiny-usb Feb 16 06:25:08 fhz kernel: [43029038.710000] usb 1-1.1: Manufacturer: Till Harbaum Feb 16 06:25:08 fhz kernel: [43029104.230000] hub 1-1:1.0: port 1 disabled by hub (EMI?), re-enabling... Feb 16 06:25:08 fhz kernel: [43029104.230000] usb 1-1.1: USB disconnect, address 10 Feb 16 06:25:08 fhz kernel: [43029104.330000] usb 1-1.1: new low speed USB device using ehci_hcd and address 11 Feb 16 06:25:08 fhz kernel: [43029104.450000] usb 1-1.1: configuration #1 chosen from 1 choice Feb 16 06:25:08 fhz kernel: [43029104.460000] i2c-tiny-usb 1-1.1:1.0: version 2.05 found at bus 001 address 011 Feb 16 06:25:08 fhz kernel: [43029104.480000] i2c-adapter i2c-1: connected i2c-tiny-usb device Feb 16 06:25:08 fhz kernel: [43029104.490000] Unable to handle kernel paging request at virtual address 00c0ec10 Feb 16 06:25:08 fhz kernel: [43029104.490000] pgd = c0004000 Feb 16 06:25:08 fhz kernel: [43029104.490000] [00c0ec10] *pgd=00000000 Feb 16 06:25:08 fhz kernel: [43029104.490000] Internal error: Oops: f5 [#2] Feb 16 06:25:08 fhz kernel: [43029104.490000] Modules linked in: ipv6 nfsd auth_rpcgss exportfs nfs lockd nfs_acl sunrpc nls_utf8 ntfs nls_base ext2 evdev usbhid ftdi_sio i2c_tiny_usb hid ff_memless ixp4xx_eth usbserial ixp4xx_npe firmware_class ixp4xx_beeper ixp4xx_qmgr ohci_hcd ext3 jbd mbcache sd_mod ehci_hcd usb_storage usbcore scsi_mod Feb 16 06:25:08 fhz kernel: [43029104.490000] CPU: 0 Tainted: G D (2.6.26-1-ixp4xx #1) Feb 16 06:25:08 fhz kernel: [43029104.490000] PC is at __up+0x10/0x4c Feb 16 06:25:08 fhz kernel: [43029104.490000] LR is at up+0x3c/0x44 Feb 16 06:25:08 fhz kernel: [43029104.490000] pc : [<c021ccec>] lr : [<c0056bc8>] psr: 00000093 Feb 16 06:25:08 fhz kernel: [43029104.490000] sp : c0e5dd38 ip : c0e5dd48 fp : c0e5dd44 Feb 16 06:25:08 fhz kernel: [43029104.490000] r10: c0f44ce0 r9 : 00000000 r8 : bf03b9dc Feb 16 06:25:08 fhz kernel: [43029104.490000] r7 : 00000000 r6 : c0ec10c8 r5 : 00000001 r4 : 60000013 Feb 16 06:25:08 fhz kernel: [43029104.490000] r3 : c0ec10cc r2 : 00c0ec10 r1 : 00000041 r0 : c0ec10c8 Feb 16 06:25:08 fhz kernel: [43029104.490000] Flags: nzcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel Feb 16 06:25:08 fhz kernel: [43029104.490000] Control: 0000397f Table: 00734000 DAC: 00000017 Feb 16 06:25:08 fhz kernel: [43029104.490000] Process khubd (pid: 289, stack limit = 0xc0e5c268) Feb 16 06:25:08 fhz kernel: [43029104.490000] Stack: (0xc0e5dd38 to 0xc0e5e000) Feb 16 06:25:08 fhz kernel: [43029104.490000] dd20: c0e5dd5c c0e5dd48 Feb 16 06:25:08 fhz kernel: [43029104.490000] dd40: c0056bc8 c021cce8 c0ec1020 c0ec1020 c0e5dd7c c0e5dd60 c0172218 c0056b98 Feb 16 06:25:08 fhz kernel: [43029104.490000] dd60: c0ea6000 bf03b9f4 c0ec1020 c0ec10ac c0e5dd94 c0e5dd80 c01711b0 c01721bc Feb 16 06:25:08 fhz kernel: [43029104.490000] dd80: c0ec1020 c0ea6000 c0e5ddcc c0e5dd98 c0170050 c017118c c0ea6060 c0ec1088 Feb 16 06:25:08 fhz kernel: [43029104.490000] dda0: c013e008 c0ec1000 c0ea6000 c0f47800 00000000 00000000 00000000 c0f44ce0 Feb 16 06:25:08 fhz kernel: [43029104.490000] ddc0: c0e5de2c c0e5ddd0 bf024310 c016fd20 00000001 00000000 00000000 00000000 Feb 16 06:25:08 fhz kernel: [43029104.490000] dde0: 00001388 c0e5ddfc c09f41e0 00000001 00000000 c0f47804 c0f47800 00000001 Feb 16 06:25:08 fhz kernel: [43029104.490000] de00: c0ea60ec c0ea6000 00000001 bf03bfbc 00000000 bf03b8a8 00000000 c0e57400 Feb 16 06:25:08 fhz kernel: [43029104.490000] de20: c0e5de54 c0e5de30 bf02b0c0 bf023f14 00000000 00000000 c0e5de64 c0ea6060 Feb 16 06:25:08 fhz kernel: [43029104.490000] de40: c0172170 bf03bfbc c0e5de64 c0e5de58 bf025438 bf02b078 c0e5de84 c0e5de68 Feb 16 06:25:08 fhz kernel: [43029104.490000] de60: c0172048 bf0253fc c0217ed0 00000000 c0172170 c0ea6060 c0e5de94 c0e5de88 Feb 16 06:25:08 fhz kernel: [43029104.490000] de80: c0172180 c0171f60 c0e5dec4 c0e5de98 c017137c c017217c 000000d0 c0e62f28 Feb 16 06:25:08 fhz kernel: [43029104.490000] dea0: c0e62f28 c0e09dd4 c0e173a0 c0ea6060 c0ea6060 c0ea6108 c0e5dee4 c0e5dec8 Feb 16 06:25:08 fhz kernel: [43029104.490000] dec0: c017220c c0171338 c0ea6060 bf03b9f4 c0ea6060 c0ea60ec c0e5defc c0e5dee8 What I also noticed is when I do an i2cdetect the bus type of the interface is shown as dummy. Normaly the type is i2c. Thanks, Thomas. Am Montag 09 Februar 2009 20:29:04 schrieb Till Harbaum: > Hi, > > this is an unknown problem. In fact it's the first time i ever got an error > report for the device. And therefore there isn't any patch. > > There seems to be a usb write error. This is a diy hardware. There may > be several reasons causing such problems: > > Hardware problems on the i2c-tiny-usb: > - Have correct zener diodes (fast ones!) been used? > - Is the PCB home made? If yes is it really reliable? > - How long is the usb cable? > > General problems: > - What is connected to the i2c-tiny-usb? > - How much power does it draw? > - Is the nslu really able to power everything via usb? > (e.g. what happens if the i2c-tiny-usb is connected > through a self powered hub?) > > Maybe the arm kernel barfs on i2c/usb transfer problems? > > Till > > Am Montag 09 Februar 2009 schrieb Martin Michlmayr: > > Hi Till and other I2C developers, > > > > Thomas Koch, a Debian user, reported the following backtrace with > > 2.6.26 related to i2c and possibly related to the i2c-tiny-usb driver. > > This is on an ARM device. > > > > Do you know if this is a known issue for which a patch is available in > > newer kernels, or is this a new bug? > > > > > [42994982.810000] Unable to handle kernel paging request at virtual > > > address 692f7473 [42994982.810000] pgd = c1da0000 > > > [42994982.810000] [692f7473] *pgd=00000000 > > > [42994982.810000] Internal error: Oops: f3 [#2] > > > [42994982.810000] Modules linked in: ipv6 nfsd auth_rpcgss exportfs nfs > > > lockd nfs_acl sunrpc nls_utf8 ntfs nls_base ext2 evdev ftdi_sio usbhid > > > hid i2c_tiny_usb ff_memless usbserial ixp4xx_eth ixp4xx_npe > > > firmware_class ixp4xx_qmgr ixp4xx_beeper ohci_hcd ext3 jbd mbcache > > > sd_mod ehci_hcd usb_storage usbcorescsi_mod [42994982.810000] CPU: 0 > > > Tainted: G D (2.6.26-1-ixp4xx #1) [42994982.810000] PC is at > > > module_put+0x20/0x48 > > > [42994982.810000] LR is at i2c_put_adapter+0x14/0x18 > > > [42994982.810000] pc : [<c0060b00>] lr : [<c01940f4>] psr: > > > 20000093 [42994982.810000] sp : c0fc3c68 ip : c0fc3c78 fp : c0fc3c74 > > > [42994982.810000] r10: c18d3dd8 r9 : c1c0d120 r8 : 00000000 > > > [42994982.810000] r7 : c1c1a208 r6 : 00000008 r5 : c1daaac0 r4 : > > > c13fe000 [42994982.810000] r3 : 20000093 r2 : 20000013 r1 : c1daaac0 > > > r0 : 692f7373 [42994982.810000] Flags: nzCv IRQs off FIQs on Mode > > > SVC_32 ISA ARM Segment user [42994982.810000] Control: 0000397f > > > Table: 01da0000 DAC: 00000015 [42994982.810000] Process hcontrol (pid: > > > 2671, stack limit = 0xc0fc2268) [42994982.810000] Stack: (0xc0fc3c68 to > > > 0xc0fc4000) > > > [42994982.810000] 3c60: c0fc3c84 c0fc3c78 c01940f4 > > > c0060aec c0fc3c9c c0fc3c88 [42994982.810000] 3c80: c0195d94 c01940ec > > > c1daaac0 c0f0ea60 c0fc3cd4 c0fc3ca0 c009813c c0195d84 [42994982.810000] > > > 3ca0: 00000000 c0ef9d30 00000000 c1daaac0 c1c1a200 00000000 c1c1a208 > > > 00000000 [42994982.810000] 3cc0: 000000f3 00000001 c0fc3ce4 c0fc3cd8 > > > c00984c4 c0098090 c0fc3d04 c0fc3ce8 [42994982.810000] 3ce0: c0094dd0 > > > c009849c c0f16e00 c1c1a200 00000003 0000000c c0fc3d2c c0fc3d08 > > > [42994982.810000] 3d00: c0040980 c0094d64 c0f16e00 c0fc2000 c1e68060 > > > 0000000b c01941f8 00000008 [42994982.810000] 3d20: c0fc3d3c c0fc3d30 > > > c0040a00 c0040904 c0fc3d54 c0fc3d40 c0041cf8 c00409e4 [42994982.810000] > > > 3d40: c003e550 c003e420 c0fc3d64 c0fc3d58 c0029de4 c0041aec c0fc3d84 > > > c0fc3d68 [42994982.810000] 3d60: c002c460 c0029b70 c0fc3ea0 000000f3 > > > 692f7265 c0fc3ea0 c0fc3dac c0fc3d88 [42994982.810000] 3d80: c002c718 > > > c002c400 e5933000 c021db38 00000013 00000000 e5933000 00000000 > > > [42994982.810000] 3da0: c0fc3dec c0fc3db0 c002e584 c002c6b4 00000000 > > > c02c0a68 28841963 0000b229 [42994982.810000] 3dc0: c0fc3df4 ffffffff > > > c02bc1bc 000000f3 c0fc3ea0 692f7265 60000013 00000000 [42994982.810000] > > > 3de0: c0fc3e9c c0fc3df0 c00251f0 c002e150 c005b76c c02bc4cc c0fc3e24 > > > c0fc3e08 [42994982.810000] 3e00: c003080c c00307a8 c02c1680 c02c1680 > > > 00000005 00000000 c0fc3e3c c0fc3e28 [42994982.810000] 3e20: c0043e2c > > > c0037468 00000005 00000005 c0fc3e5c c0fc3e40 c002504c c0043dd4 > > > [42994982.810000] 3e40: c005b878 ffffffff 0000001f 00000020 c0fc3eec > > > c0fc3e60 c00256b0 c002500c [42994982.810000] 3e60: 00000001 c02c0a70 > > > c0f374c0 00000001 2883b65f 0000b229 c0fc3f10 ffffffff [42994982.810000] > > > 3e80: c0fc3ed4 be932b55 c051d360 c0025c48 c0fc3f04 c0fc3ea0 c002566c > > > c00251c0 [42994982.810000] 3ea0: c0fc2028 c0fc3f0c 00000001 692f7265 > > > c1c73a08 00000001 be932b55 c051d360 [42994982.810000] 3ec0: c0025c48 > > > c0fc2000 00000000 c0fc3f04 c0fc3f08 c0fc3ee8 c0194cd4 c01941f8 > > > [42994982.810000] 3ee0: a0000013 ffffffff 00000001 00000001 be932b55 > > > c051d360 c0fc3f2c c0fc3f08 [42994982.810000] 3f00: c0194cd4 c01941ec > > > c0fc3f4c 0001004b c13f0001 c051d360 be932b55 fffffff4 [42994982.810000] > > > 3f20: c0fc3f4c c0fc3f30 c01961ac c0194c98 c1daaac0 be932b55 c0fc3f78 > > > 00000001 [42994982.810000] 3f40: c0fc3f74 c0fc3f50 c0097778 c0196170 > > > 006d6561 00000a6f c1daaac0 fffffff7 [42994982.810000] 3f60: 00000000 > > > 00000000 c0fc3fa4 c0fc3f78 c0097c44 c00976d0 00000000 00000000 > > > [42994982.810000] 3f80: 00000000 00000000 0000d6fc 00000000 000090a0 > > > 00000003 00000000 c0fc3fa8 [42994982.810000] 3fa0: c0025aa0 c0097c0c > > > 0000d6fc 00000000 00000003 be932b55 00000001 be932b55 [42994982.810000] > > > 3fc0: 0000d6fc 00000000 000090a0 00000003 00000000 00000000 40025000 > > > be932b6c [42994982.810000] 3fe0: 00000000 be932a40 0000b4ac 40209eac > > > 40000010 00000003 0002003d 00000000 [42994982.810000] Backtrace: > > > [42994982.810000] [<c0060ae0>] (module_put+0x0/0x48) from [<c01940f4>] > > > (i2c_put_adapter+0x14/0x18) [42994982.810000] [<c01940e0>] > > > (i2c_put_adapter+0x0/0x18) from [<c0195d94>] (i2cdev_release+0x1c/0x30) > > > [42994982.810000] [<c0195d78>] (i2cdev_release+0x0/0x30) from > > > [<c009813c>] (__fput+0xb8/0x178) [42994982.810000] r5:c0f0ea60 > > > r4:c1daaac0 > > > [42994982.810000] [<c0098084>] (__fput+0x0/0x178) from [<c00984c4>] > > > (fput+0x34/0x38) [42994982.810000] [<c0098490>] (fput+0x0/0x38) from > > > [<c0094dd0>] (filp_close+0x78/0x84) [42994982.810000] [<c0094d58>] > > > (filp_close+0x0/0x84) from [<c0040980>] (put_files_struct+0x88/0xe0) > > > [42994982.810000] r6:0000000c r5:00000003 r4:c1c1a200 > > > [42994982.810000] [<c00408f8>] (put_files_struct+0x0/0xe0) from > > > [<c0040a00>] (exit_files+0x28/0x2c) [42994982.810000] r8:00000008 > > > r7:c01941f8 r6:0000000b r5:c1e68060 r4:c0fc2000 [42994982.810000] > > > [<c00409d8>] (exit_files+0x0/0x2c) from [<c0041cf8>] > > > (do_exit+0x218/0x6a4) [42994982.810000] [<c0041ae0>] > > > (do_exit+0x0/0x6a4) from [<c0029de4>] (die+0x280/0x304) > > > [42994982.810000] [<c0029b64>] (die+0x0/0x304) from [<c002c460>] > > > (__do_kernel_fault+0x6c/0x80) [42994982.810000] [<c002c3f4>] > > > (__do_kernel_fault+0x0/0x80) from [<c002c718>] (do_bad_area+0x70/0x7c) > > > [42994982.810000] r7:c0fc3ea0 r6:692f7265 r5:000000f3 r4:c0fc3ea0 > > > [42994982.810000] [<c002c6a8>] (do_bad_area+0x0/0x7c) from [<c002e584>] > > > (do_alignment+0x440/0x59c) [42994982.810000] r6:00000000 r5:e5933000 > > > r4:00000000 > > > [42994982.810000] [<c002e144>] (do_alignment+0x0/0x59c) from > > > [<c00251f0>] (do_DataAbort+0x3c/0xa0) [42994982.810000] [<c00251b4>] > > > (do_DataAbort+0x0/0xa0) from [<c002566c>] (__dabt_svc+0x4c/0x60) > > > [42994982.810000] Exception stack(0xc0fc3ea0 to 0xc0fc3ee8) > > > [42994982.810000] 3ea0: c0fc2028 c0fc3f0c 00000001 692f7265 c1c73a08 > > > 00000001 be932b55 c051d360 [42994982.810000] 3ec0: c0025c48 c0fc2000 > > > 00000000 c0fc3f04 c0fc3f08 c0fc3ee8 c0194cd4 c01941f8 [42994982.810000] > > > 3ee0: a0000013 ffffffff > > > [42994982.810000] r8:c0025c48 r7:c051d360 r6:be932b55 r5:c0fc3ed4 > > > r4:ffffffff [42994982.810000] [<c01941e0>] (i2c_transfer+0x0/0x98) from > > > [<c0194cd4>] (i2c_master_recv+0x48/0x58) [42994982.810000] r7:c051d360 > > > r6:be932b55 r5:00000001 r4:00000001 [42994982.810000] [<c0194c8c>] > > > (i2c_master_recv+0x0/0x58) from [<c01961ac>] (i2cdev_read+0x48/0xa0) > > > [42994982.810000] r4:fffffff4 > > > [42994982.810000] [<c0196164>] (i2cdev_read+0x0/0xa0) from [<c0097778>] > > > (vfs_read+0xb4/0x18c) [42994982.810000] r7:00000001 r6:c0fc3f78 > > > r5:be932b55 r4:c1daaac0 [42994982.810000] [<c00976c4>] > > > (vfs_read+0x0/0x18c) from [<c0097c44>] (sys_read+0x44/0x70) > > > [42994982.810000] r7:00000000 r6:00000000 r5:fffffff7 r4:c1daaac0 > > > [42994982.810000] [<c0097c00>] (sys_read+0x0/0x70) from [<c0025aa0>] > > > (ret_fast_syscall+0x0/0x2c) [42994982.810000] r7:00000003 r6:000090a0 > > > r5:00000000 r4:0000d6fc [42994982.810000] Code: 0a00000b e10f2000 > > > e3823080 e121f003 (e5903100) [42994983.440000] ---[ end trace > > > 051f259b86cac584 ]--- > > > > and: > > > > * Thomas Koch <tom-koch@xxxxxx> [2009-02-04 05:12]: > > > > Can you please tell us more: when does this happen, how often, how > > > > reliably can you reproduce this problem, etc? > > > > > > This happens several times a day. > > > The system is a linksys nslu2. > > > It looks like it has something to do with the i2c-tiny-usb driver. > > > > > > [43177942.750000] i2c-adapter i2c-1: failure writing data > > > [43177942.880000] hub 1-1:1.0: port 1 disabled by hub (EMI?), > > > re-enabling... [43177942.880000] usb 1-1.1: USB disconnect, address 17 > > > [43177942.970000] usb 1-1.1: new low speed USB device using ehci_hcd > > > and address 18 > > > [43177943.090000] usb 1-1.1: configuration #1 chosen from 1 choice > > > [43177943.100000] i2c-tiny-usb 1-1.1:1.0: version 2.05 found at bus 001 > > > address 018 > > > [43177943.130000] i2c-adapter i2c-1: connected i2c-tiny-usb device > > > [43177943.140000] usb 1-1.1: New USB device found, idVendor=0403, > > > idProduct=c631 > > > [43177943.140000] usb 1-1.1: New USB device strings: Mfr=1, Product=2, > > > SerialNumber=0 > > > [43177943.150000] usb 1-1.1: Product: i2c-tiny-usb > > > [43177943.160000] usb 1-1.1: Manufacturer: Till Harbaum > > > > > > Most of the time I can see it after the device is registered again. > > > > > > Thanks, > > > Thomas -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
