| Message ID | 8e380fbe6853bfebd067cdeba2e65e83a3df2922.1623318855.git.sean@mess.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | IR driver for USB-UIRT device | expand |
Hi Sean,
I love your patch! Perhaps something to improve:
[auto build test WARNING on linuxtv-media/master]
[also build test WARNING on usb-serial/usb-next usb/usb-testing peter.chen-usb/for-usb-next v5.13-rc6 next-20210617]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135
base: git://linuxtv.org/media_tree.git master
config: powerpc64-randconfig-r012-20210617 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc64 cross compiling tool for clang build
# apt-get install binutils-powerpc64-linux-gnu
# https://github.com/0day-ci/linux/commit/17d3a0332baecb0359e05e8ae755478c7a1a4468
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135
git checkout 17d3a0332baecb0359e05e8ae755478c7a1a4468
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
In file included from drivers/media/rc/uirt.c:11:
In file included from include/linux/completion.h:12:
In file included from include/linux/swait.h:5:
In file included from include/linux/list.h:9:
In file included from include/linux/kernel.h:12:
In file included from include/linux/bitops.h:32:
In file included from arch/powerpc/include/asm/bitops.h:62:
arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined]
#define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
^
<built-in>:310:9: note: previous definition is here
#define __lwsync __builtin_ppc_lwsync
^
>> drivers/media/rc/uirt.c:639:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!urb)
^~~~
drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here
return err;
^~~
drivers/media/rc/uirt.c:639:2: note: remove the 'if' if its condition is always false
if (!urb)
^~~~~~~~~
drivers/media/rc/uirt.c:630:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!urb)
^~~~
drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here
return err;
^~~
drivers/media/rc/uirt.c:630:2: note: remove the 'if' if its condition is always false
if (!urb)
^~~~~~~~~
drivers/media/rc/uirt.c:626:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!rc)
^~~
drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here
return err;
^~~
drivers/media/rc/uirt.c:626:2: note: remove the 'if' if its condition is always false
if (!rc)
^~~~~~~~
drivers/media/rc/uirt.c:622:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!uirt->out)
^~~~~~~~~~
drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here
return err;
^~~
drivers/media/rc/uirt.c:622:2: note: remove the 'if' if its condition is always false
if (!uirt->out)
^~~~~~~~~~~~~~~
drivers/media/rc/uirt.c:618:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (!uirt->in)
^~~~~~~~~
drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here
return err;
^~~
drivers/media/rc/uirt.c:618:2: note: remove the 'if' if its condition is always false
if (!uirt->in)
^~~~~~~~~~~~~~
drivers/media/rc/uirt.c:604:15: note: initialize the variable 'err' to silence this warning
int pipe, err;
^
= 0
6 warnings generated.
vim +639 drivers/media/rc/uirt.c
594
595 static int uirt_probe(struct usb_interface *intf,
596 const struct usb_device_id *id)
597 {
598 struct usb_device *usbdev = interface_to_usbdev(intf);
599 struct usb_endpoint_descriptor *ep_in;
600 struct usb_endpoint_descriptor *ep_out;
601 struct uirt *uirt;
602 struct rc_dev *rc;
603 struct urb *urb;
604 int pipe, err;
605
606 if (usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out, NULL, NULL) ||
607 usb_endpoint_maxp(ep_in) != MAX_PACKET ||
608 usb_endpoint_maxp(ep_out) != MAX_PACKET) {
609 dev_err(&intf->dev, "required endpoints not found\n");
610 return -ENODEV;
611 }
612
613 uirt = kzalloc(sizeof(*uirt), GFP_KERNEL);
614 if (!uirt)
615 return -ENOMEM;
616
617 uirt->in = kmalloc(MAX_PACKET, GFP_KERNEL);
618 if (!uirt->in)
619 goto free_uirt;
620
621 uirt->out = kmalloc(MAX_PACKET, GFP_KERNEL);
622 if (!uirt->out)
623 goto free_uirt;
624
625 rc = rc_allocate_device(RC_DRIVER_IR_RAW);
626 if (!rc)
627 goto free_uirt;
628
629 urb = usb_alloc_urb(0, GFP_KERNEL);
630 if (!urb)
631 goto free_rcdev;
632
633 pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress);
634 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->in, MAX_PACKET,
635 uirt_in_callback, uirt);
636 uirt->urb_in = urb;
637
638 urb = usb_alloc_urb(0, GFP_KERNEL);
> 639 if (!urb)
640 goto free_rcdev;
641
642 pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress);
643 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->out, MAX_PACKET,
644 uirt_out_callback, uirt);
645
646 uirt->dev = &intf->dev;
647 uirt->usbdev = usbdev;
648 uirt->rc = rc;
649 uirt->urb_out = urb;
650 uirt->rx_state = RX_STATE_INTERSPACE_HIGH;
651
652 err = usb_submit_urb(uirt->urb_in, GFP_KERNEL);
653 if (err != 0) {
654 dev_err(uirt->dev, "failed to submit read urb: %d\n", err);
655 goto free_rcdev;
656 }
657
658 err = init_ftdi(usbdev);
659 if (err) {
660 dev_err(uirt->dev, "failed to setup ftdi: %d\n", err);
661 goto kill_urbs;
662 }
663
664 err = uirt_setup(uirt);
665 if (err)
666 goto kill_urbs;
667
668 usb_make_path(usbdev, uirt->phys, sizeof(uirt->phys));
669
670 rc->device_name = "USB-UIRT";
671 rc->driver_name = KBUILD_MODNAME;
672 rc->input_phys = uirt->phys;
673 usb_to_input_id(usbdev, &rc->input_id);
674 rc->dev.parent = &intf->dev;
675 rc->priv = uirt;
676 rc->tx_ir = uirt_tx;
677 rc->s_tx_carrier = uirt_set_tx_carrier;
678 rc->s_learning_mode = uirt_set_rx_wideband;
679 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
680 rc->map_name = RC_MAP_RC6_MCE;
681 rc->rx_resolution = UNIT_US;
682 rc->timeout = IR_TIMEOUT;
683
684 uirt_set_tx_carrier(rc, 38000);
685
686 err = rc_register_device(rc);
687 if (err)
688 goto kill_urbs;
689
690 usb_set_intfdata(intf, uirt);
691
692 return 0;
693
694 kill_urbs:
695 usb_kill_urb(uirt->urb_in);
696 usb_kill_urb(uirt->urb_out);
697 free_rcdev:
698 usb_free_urb(uirt->urb_in);
699 usb_free_urb(uirt->urb_out);
700 rc_free_device(rc);
701 free_uirt:
702 kfree(uirt->in);
703 kfree(uirt->out);
704 kfree(uirt);
705 return err;
706 }
707
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
On Fri, Jun 18, 2021 at 06:18:06AM +0800, kernel test robot wrote: > Hi Sean, > > I love your patch! Perhaps something to improve: > > [auto build test WARNING on linuxtv-media/master] > [also build test WARNING on usb-serial/usb-next usb/usb-testing peter.chen-usb/for-usb-next v5.13-rc6 next-20210617] > [If your patch is applied to the wrong git tree, kindly drop us a note. > And when submitting patch, we suggest to use '--base' as documented in > https://git-scm.com/docs/git-format-patch] > > url: https://github.com/0day-ci/linux/commits/Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135 > base: git://linuxtv.org/media_tree.git master > config: powerpc64-randconfig-r012-20210617 (attached as .config) > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # install powerpc64 cross compiling tool for clang build > # apt-get install binutils-powerpc64-linux-gnu > # https://github.com/0day-ci/linux/commit/17d3a0332baecb0359e05e8ae755478c7a1a4468 > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135 > git checkout 17d3a0332baecb0359e05e8ae755478c7a1a4468 > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp@intel.com> > > All warnings (new ones prefixed by >>): > > In file included from drivers/media/rc/uirt.c:11: > In file included from include/linux/completion.h:12: > In file included from include/linux/swait.h:5: > In file included from include/linux/list.h:9: > In file included from include/linux/kernel.h:12: > In file included from include/linux/bitops.h:32: > In file included from arch/powerpc/include/asm/bitops.h:62: > arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] > #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") > ^ > <built-in>:310:9: note: previous definition is here > #define __lwsync __builtin_ppc_lwsync > ^ > >> drivers/media/rc/uirt.c:639:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > if (!urb) > ^~~~ > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > return err; This is interesting. clang is right here, there are error paths where err is not initialized. gcc-11.1 does not pick this up for some reason. The error path should be an immediate dominator so it shouldn't be complicated to detect. I'll send out a v5 with this issue fixed. Sean > ^~~ > drivers/media/rc/uirt.c:639:2: note: remove the 'if' if its condition is always false > if (!urb) > ^~~~~~~~~ > drivers/media/rc/uirt.c:630:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > if (!urb) > ^~~~ > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > return err; > ^~~ > drivers/media/rc/uirt.c:630:2: note: remove the 'if' if its condition is always false > if (!urb) > ^~~~~~~~~ > drivers/media/rc/uirt.c:626:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > if (!rc) > ^~~ > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > return err; > ^~~ > drivers/media/rc/uirt.c:626:2: note: remove the 'if' if its condition is always false > if (!rc) > ^~~~~~~~ > drivers/media/rc/uirt.c:622:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > if (!uirt->out) > ^~~~~~~~~~ > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > return err; > ^~~ > drivers/media/rc/uirt.c:622:2: note: remove the 'if' if its condition is always false > if (!uirt->out) > ^~~~~~~~~~~~~~~ > drivers/media/rc/uirt.c:618:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > if (!uirt->in) > ^~~~~~~~~ > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > return err; > ^~~ > drivers/media/rc/uirt.c:618:2: note: remove the 'if' if its condition is always false > if (!uirt->in) > ^~~~~~~~~~~~~~ > drivers/media/rc/uirt.c:604:15: note: initialize the variable 'err' to silence this warning > int pipe, err; > ^ > = 0 > 6 warnings generated. > > > vim +639 drivers/media/rc/uirt.c > > 594 > 595 static int uirt_probe(struct usb_interface *intf, > 596 const struct usb_device_id *id) > 597 { > 598 struct usb_device *usbdev = interface_to_usbdev(intf); > 599 struct usb_endpoint_descriptor *ep_in; > 600 struct usb_endpoint_descriptor *ep_out; > 601 struct uirt *uirt; > 602 struct rc_dev *rc; > 603 struct urb *urb; > 604 int pipe, err; > 605 > 606 if (usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out, NULL, NULL) || > 607 usb_endpoint_maxp(ep_in) != MAX_PACKET || > 608 usb_endpoint_maxp(ep_out) != MAX_PACKET) { > 609 dev_err(&intf->dev, "required endpoints not found\n"); > 610 return -ENODEV; > 611 } > 612 > 613 uirt = kzalloc(sizeof(*uirt), GFP_KERNEL); > 614 if (!uirt) > 615 return -ENOMEM; > 616 > 617 uirt->in = kmalloc(MAX_PACKET, GFP_KERNEL); > 618 if (!uirt->in) > 619 goto free_uirt; > 620 > 621 uirt->out = kmalloc(MAX_PACKET, GFP_KERNEL); > 622 if (!uirt->out) > 623 goto free_uirt; > 624 > 625 rc = rc_allocate_device(RC_DRIVER_IR_RAW); > 626 if (!rc) > 627 goto free_uirt; > 628 > 629 urb = usb_alloc_urb(0, GFP_KERNEL); > 630 if (!urb) > 631 goto free_rcdev; > 632 > 633 pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress); > 634 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->in, MAX_PACKET, > 635 uirt_in_callback, uirt); > 636 uirt->urb_in = urb; > 637 > 638 urb = usb_alloc_urb(0, GFP_KERNEL); > > 639 if (!urb) > 640 goto free_rcdev; > 641 > 642 pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress); > 643 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->out, MAX_PACKET, > 644 uirt_out_callback, uirt); > 645 > 646 uirt->dev = &intf->dev; > 647 uirt->usbdev = usbdev; > 648 uirt->rc = rc; > 649 uirt->urb_out = urb; > 650 uirt->rx_state = RX_STATE_INTERSPACE_HIGH; > 651 > 652 err = usb_submit_urb(uirt->urb_in, GFP_KERNEL); > 653 if (err != 0) { > 654 dev_err(uirt->dev, "failed to submit read urb: %d\n", err); > 655 goto free_rcdev; > 656 } > 657 > 658 err = init_ftdi(usbdev); > 659 if (err) { > 660 dev_err(uirt->dev, "failed to setup ftdi: %d\n", err); > 661 goto kill_urbs; > 662 } > 663 > 664 err = uirt_setup(uirt); > 665 if (err) > 666 goto kill_urbs; > 667 > 668 usb_make_path(usbdev, uirt->phys, sizeof(uirt->phys)); > 669 > 670 rc->device_name = "USB-UIRT"; > 671 rc->driver_name = KBUILD_MODNAME; > 672 rc->input_phys = uirt->phys; > 673 usb_to_input_id(usbdev, &rc->input_id); > 674 rc->dev.parent = &intf->dev; > 675 rc->priv = uirt; > 676 rc->tx_ir = uirt_tx; > 677 rc->s_tx_carrier = uirt_set_tx_carrier; > 678 rc->s_learning_mode = uirt_set_rx_wideband; > 679 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; > 680 rc->map_name = RC_MAP_RC6_MCE; > 681 rc->rx_resolution = UNIT_US; > 682 rc->timeout = IR_TIMEOUT; > 683 > 684 uirt_set_tx_carrier(rc, 38000); > 685 > 686 err = rc_register_device(rc); > 687 if (err) > 688 goto kill_urbs; > 689 > 690 usb_set_intfdata(intf, uirt); > 691 > 692 return 0; > 693 > 694 kill_urbs: > 695 usb_kill_urb(uirt->urb_in); > 696 usb_kill_urb(uirt->urb_out); > 697 free_rcdev: > 698 usb_free_urb(uirt->urb_in); > 699 usb_free_urb(uirt->urb_out); > 700 rc_free_device(rc); > 701 free_uirt: > 702 kfree(uirt->in); > 703 kfree(uirt->out); > 704 kfree(uirt); > 705 return err; > 706 } > 707 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
On 6/18/2021 1:44 AM, Sean Young wrote: > On Fri, Jun 18, 2021 at 06:18:06AM +0800, kernel test robot wrote: >> Hi Sean, >> >> I love your patch! Perhaps something to improve: >> >> [auto build test WARNING on linuxtv-media/master] >> [also build test WARNING on usb-serial/usb-next usb/usb-testing peter.chen-usb/for-usb-next v5.13-rc6 next-20210617] >> [If your patch is applied to the wrong git tree, kindly drop us a note. >> And when submitting patch, we suggest to use '--base' as documented in >> https://git-scm.com/docs/git-format-patch] >> >> url: https://github.com/0day-ci/linux/commits/Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135 >> base: git://linuxtv.org/media_tree.git master >> config: powerpc64-randconfig-r012-20210617 (attached as .config) >> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) >> reproduce (this is a W=1 build): >> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross >> chmod +x ~/bin/make.cross >> # install powerpc64 cross compiling tool for clang build >> # apt-get install binutils-powerpc64-linux-gnu >> # https://github.com/0day-ci/linux/commit/17d3a0332baecb0359e05e8ae755478c7a1a4468 >> git remote add linux-review https://github.com/0day-ci/linux >> git fetch --no-tags linux-review Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135 >> git checkout 17d3a0332baecb0359e05e8ae755478c7a1a4468 >> # save the attached .config to linux build tree >> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 >> >> If you fix the issue, kindly add following tag as appropriate >> Reported-by: kernel test robot <lkp@intel.com> >> >> All warnings (new ones prefixed by >>): >> >> In file included from drivers/media/rc/uirt.c:11: >> In file included from include/linux/completion.h:12: >> In file included from include/linux/swait.h:5: >> In file included from include/linux/list.h:9: >> In file included from include/linux/kernel.h:12: >> In file included from include/linux/bitops.h:32: >> In file included from arch/powerpc/include/asm/bitops.h:62: >> arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] >> #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") >> ^ >> <built-in>:310:9: note: previous definition is here >> #define __lwsync __builtin_ppc_lwsync >> ^ >>>> drivers/media/rc/uirt.c:639:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] >> if (!urb) >> ^~~~ >> drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here >> return err; > > This is interesting. clang is right here, there are error paths where err is > not initialized. gcc-11.1 does not pick this up for some reason. The error path > should be an immediate dominator so it shouldn't be complicated to detect. The reason GCC does not warn about this is due to commit 78a5255ffb6a ("Stop the ad-hoc games with -Wno-maybe-initialized"), which disables the GCC version of this warning except with W=2, which very few people use. You could use 'KCFLAGS=-Wmaybe-uninitialized' to try and see the same warning. Cheers, Nathan > I'll send out a v5 with this issue fixed. > > Sean > >> ^~~ >> drivers/media/rc/uirt.c:639:2: note: remove the 'if' if its condition is always false >> if (!urb) >> ^~~~~~~~~ >> drivers/media/rc/uirt.c:630:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] >> if (!urb) >> ^~~~ >> drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here >> return err; >> ^~~ >> drivers/media/rc/uirt.c:630:2: note: remove the 'if' if its condition is always false >> if (!urb) >> ^~~~~~~~~ >> drivers/media/rc/uirt.c:626:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] >> if (!rc) >> ^~~ >> drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here >> return err; >> ^~~ >> drivers/media/rc/uirt.c:626:2: note: remove the 'if' if its condition is always false >> if (!rc) >> ^~~~~~~~ >> drivers/media/rc/uirt.c:622:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] >> if (!uirt->out) >> ^~~~~~~~~~ >> drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here >> return err; >> ^~~ >> drivers/media/rc/uirt.c:622:2: note: remove the 'if' if its condition is always false >> if (!uirt->out) >> ^~~~~~~~~~~~~~~ >> drivers/media/rc/uirt.c:618:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] >> if (!uirt->in) >> ^~~~~~~~~ >> drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here >> return err; >> ^~~ >> drivers/media/rc/uirt.c:618:2: note: remove the 'if' if its condition is always false >> if (!uirt->in) >> ^~~~~~~~~~~~~~ >> drivers/media/rc/uirt.c:604:15: note: initialize the variable 'err' to silence this warning >> int pipe, err; >> ^ >> = 0 >> 6 warnings generated. >> >> >> vim +639 drivers/media/rc/uirt.c >> >> 594 >> 595 static int uirt_probe(struct usb_interface *intf, >> 596 const struct usb_device_id *id) >> 597 { >> 598 struct usb_device *usbdev = interface_to_usbdev(intf); >> 599 struct usb_endpoint_descriptor *ep_in; >> 600 struct usb_endpoint_descriptor *ep_out; >> 601 struct uirt *uirt; >> 602 struct rc_dev *rc; >> 603 struct urb *urb; >> 604 int pipe, err; >> 605 >> 606 if (usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out, NULL, NULL) || >> 607 usb_endpoint_maxp(ep_in) != MAX_PACKET || >> 608 usb_endpoint_maxp(ep_out) != MAX_PACKET) { >> 609 dev_err(&intf->dev, "required endpoints not found\n"); >> 610 return -ENODEV; >> 611 } >> 612 >> 613 uirt = kzalloc(sizeof(*uirt), GFP_KERNEL); >> 614 if (!uirt) >> 615 return -ENOMEM; >> 616 >> 617 uirt->in = kmalloc(MAX_PACKET, GFP_KERNEL); >> 618 if (!uirt->in) >> 619 goto free_uirt; >> 620 >> 621 uirt->out = kmalloc(MAX_PACKET, GFP_KERNEL); >> 622 if (!uirt->out) >> 623 goto free_uirt; >> 624 >> 625 rc = rc_allocate_device(RC_DRIVER_IR_RAW); >> 626 if (!rc) >> 627 goto free_uirt; >> 628 >> 629 urb = usb_alloc_urb(0, GFP_KERNEL); >> 630 if (!urb) >> 631 goto free_rcdev; >> 632 >> 633 pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress); >> 634 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->in, MAX_PACKET, >> 635 uirt_in_callback, uirt); >> 636 uirt->urb_in = urb; >> 637 >> 638 urb = usb_alloc_urb(0, GFP_KERNEL); >> > 639 if (!urb) >> 640 goto free_rcdev; >> 641 >> 642 pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress); >> 643 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->out, MAX_PACKET, >> 644 uirt_out_callback, uirt); >> 645 >> 646 uirt->dev = &intf->dev; >> 647 uirt->usbdev = usbdev; >> 648 uirt->rc = rc; >> 649 uirt->urb_out = urb; >> 650 uirt->rx_state = RX_STATE_INTERSPACE_HIGH; >> 651 >> 652 err = usb_submit_urb(uirt->urb_in, GFP_KERNEL); >> 653 if (err != 0) { >> 654 dev_err(uirt->dev, "failed to submit read urb: %d\n", err); >> 655 goto free_rcdev; >> 656 } >> 657 >> 658 err = init_ftdi(usbdev); >> 659 if (err) { >> 660 dev_err(uirt->dev, "failed to setup ftdi: %d\n", err); >> 661 goto kill_urbs; >> 662 } >> 663 >> 664 err = uirt_setup(uirt); >> 665 if (err) >> 666 goto kill_urbs; >> 667 >> 668 usb_make_path(usbdev, uirt->phys, sizeof(uirt->phys)); >> 669 >> 670 rc->device_name = "USB-UIRT"; >> 671 rc->driver_name = KBUILD_MODNAME; >> 672 rc->input_phys = uirt->phys; >> 673 usb_to_input_id(usbdev, &rc->input_id); >> 674 rc->dev.parent = &intf->dev; >> 675 rc->priv = uirt; >> 676 rc->tx_ir = uirt_tx; >> 677 rc->s_tx_carrier = uirt_set_tx_carrier; >> 678 rc->s_learning_mode = uirt_set_rx_wideband; >> 679 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; >> 680 rc->map_name = RC_MAP_RC6_MCE; >> 681 rc->rx_resolution = UNIT_US; >> 682 rc->timeout = IR_TIMEOUT; >> 683 >> 684 uirt_set_tx_carrier(rc, 38000); >> 685 >> 686 err = rc_register_device(rc); >> 687 if (err) >> 688 goto kill_urbs; >> 689 >> 690 usb_set_intfdata(intf, uirt); >> 691 >> 692 return 0; >> 693 >> 694 kill_urbs: >> 695 usb_kill_urb(uirt->urb_in); >> 696 usb_kill_urb(uirt->urb_out); >> 697 free_rcdev: >> 698 usb_free_urb(uirt->urb_in); >> 699 usb_free_urb(uirt->urb_out); >> 700 rc_free_device(rc); >> 701 free_uirt: >> 702 kfree(uirt->in); >> 703 kfree(uirt->out); >> 704 kfree(uirt); >> 705 return err; >> 706 } >> 707 >> >> --- >> 0-DAY CI Kernel Test Service, Intel Corporation >> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org > >
On Fri, Jun 18, 2021 at 10:04:58AM -0700, Nathan Chancellor wrote: > On 6/18/2021 1:44 AM, Sean Young wrote: > > On Fri, Jun 18, 2021 at 06:18:06AM +0800, kernel test robot wrote: > > > Hi Sean, > > > > > > I love your patch! Perhaps something to improve: > > > > > > [auto build test WARNING on linuxtv-media/master] > > > [also build test WARNING on usb-serial/usb-next usb/usb-testing peter.chen-usb/for-usb-next v5.13-rc6 next-20210617] > > > [If your patch is applied to the wrong git tree, kindly drop us a note. > > > And when submitting patch, we suggest to use '--base' as documented in > > > https://git-scm.com/docs/git-format-patch] > > > > > > url: https://github.com/0day-ci/linux/commits/Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135 > > > base: git://linuxtv.org/media_tree.git master > > > config: powerpc64-randconfig-r012-20210617 (attached as .config) > > > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) > > > reproduce (this is a W=1 build): > > > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > > > chmod +x ~/bin/make.cross > > > # install powerpc64 cross compiling tool for clang build > > > # apt-get install binutils-powerpc64-linux-gnu > > > # https://github.com/0day-ci/linux/commit/17d3a0332baecb0359e05e8ae755478c7a1a4468 > > > git remote add linux-review https://github.com/0day-ci/linux > > > git fetch --no-tags linux-review Sean-Young/IR-driver-for-USB-UIRT-device/20210616-182135 > > > git checkout 17d3a0332baecb0359e05e8ae755478c7a1a4468 > > > # save the attached .config to linux build tree > > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 > > > > > > If you fix the issue, kindly add following tag as appropriate > > > Reported-by: kernel test robot <lkp@intel.com> > > > > > > All warnings (new ones prefixed by >>): > > > > > > In file included from drivers/media/rc/uirt.c:11: > > > In file included from include/linux/completion.h:12: > > > In file included from include/linux/swait.h:5: > > > In file included from include/linux/list.h:9: > > > In file included from include/linux/kernel.h:12: > > > In file included from include/linux/bitops.h:32: > > > In file included from arch/powerpc/include/asm/bitops.h:62: > > > arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] > > > #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") > > > ^ > > > <built-in>:310:9: note: previous definition is here > > > #define __lwsync __builtin_ppc_lwsync > > > ^ > > > > > drivers/media/rc/uirt.c:639:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > > > if (!urb) > > > ^~~~ > > > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > > > return err; > > > > This is interesting. clang is right here, there are error paths where err is > > not initialized. gcc-11.1 does not pick this up for some reason. The error path > > should be an immediate dominator so it shouldn't be complicated to detect. > > The reason GCC does not warn about this is due to commit 78a5255ffb6a ("Stop > the ad-hoc games with -Wno-maybe-initialized"), which disables the GCC > version of this warning except with W=2, which very few people use. You > could use 'KCFLAGS=-Wmaybe-uninitialized' to try and see the same warning. You're right, this is exactly the issue here. When running with W=2 or KCFLAGS=-Wmaybe-uninitialized you do get the warning. There are paths where err are initialized, so gcc correctly says: warning: ‘err’ may be used uninitialized in this function [-Wmaybe-uninitialized] Thanks, Sean > > Cheers, > Nathan > > > I'll send out a v5 with this issue fixed. > > > > Sean > > > > > ^~~ > > > drivers/media/rc/uirt.c:639:2: note: remove the 'if' if its condition is always false > > > if (!urb) > > > ^~~~~~~~~ > > > drivers/media/rc/uirt.c:630:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > > > if (!urb) > > > ^~~~ > > > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > > > return err; > > > ^~~ > > > drivers/media/rc/uirt.c:630:2: note: remove the 'if' if its condition is always false > > > if (!urb) > > > ^~~~~~~~~ > > > drivers/media/rc/uirt.c:626:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > > > if (!rc) > > > ^~~ > > > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > > > return err; > > > ^~~ > > > drivers/media/rc/uirt.c:626:2: note: remove the 'if' if its condition is always false > > > if (!rc) > > > ^~~~~~~~ > > > drivers/media/rc/uirt.c:622:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > > > if (!uirt->out) > > > ^~~~~~~~~~ > > > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > > > return err; > > > ^~~ > > > drivers/media/rc/uirt.c:622:2: note: remove the 'if' if its condition is always false > > > if (!uirt->out) > > > ^~~~~~~~~~~~~~~ > > > drivers/media/rc/uirt.c:618:6: warning: variable 'err' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] > > > if (!uirt->in) > > > ^~~~~~~~~ > > > drivers/media/rc/uirt.c:705:9: note: uninitialized use occurs here > > > return err; > > > ^~~ > > > drivers/media/rc/uirt.c:618:2: note: remove the 'if' if its condition is always false > > > if (!uirt->in) > > > ^~~~~~~~~~~~~~ > > > drivers/media/rc/uirt.c:604:15: note: initialize the variable 'err' to silence this warning > > > int pipe, err; > > > ^ > > > = 0 > > > 6 warnings generated. > > > > > > > > > vim +639 drivers/media/rc/uirt.c > > > > > > 594 > > > 595 static int uirt_probe(struct usb_interface *intf, > > > 596 const struct usb_device_id *id) > > > 597 { > > > 598 struct usb_device *usbdev = interface_to_usbdev(intf); > > > 599 struct usb_endpoint_descriptor *ep_in; > > > 600 struct usb_endpoint_descriptor *ep_out; > > > 601 struct uirt *uirt; > > > 602 struct rc_dev *rc; > > > 603 struct urb *urb; > > > 604 int pipe, err; > > > 605 > > > 606 if (usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out, NULL, NULL) || > > > 607 usb_endpoint_maxp(ep_in) != MAX_PACKET || > > > 608 usb_endpoint_maxp(ep_out) != MAX_PACKET) { > > > 609 dev_err(&intf->dev, "required endpoints not found\n"); > > > 610 return -ENODEV; > > > 611 } > > > 612 > > > 613 uirt = kzalloc(sizeof(*uirt), GFP_KERNEL); > > > 614 if (!uirt) > > > 615 return -ENOMEM; > > > 616 > > > 617 uirt->in = kmalloc(MAX_PACKET, GFP_KERNEL); > > > 618 if (!uirt->in) > > > 619 goto free_uirt; > > > 620 > > > 621 uirt->out = kmalloc(MAX_PACKET, GFP_KERNEL); > > > 622 if (!uirt->out) > > > 623 goto free_uirt; > > > 624 > > > 625 rc = rc_allocate_device(RC_DRIVER_IR_RAW); > > > 626 if (!rc) > > > 627 goto free_uirt; > > > 628 > > > 629 urb = usb_alloc_urb(0, GFP_KERNEL); > > > 630 if (!urb) > > > 631 goto free_rcdev; > > > 632 > > > 633 pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress); > > > 634 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->in, MAX_PACKET, > > > 635 uirt_in_callback, uirt); > > > 636 uirt->urb_in = urb; > > > 637 > > > 638 urb = usb_alloc_urb(0, GFP_KERNEL); > > > > 639 if (!urb) > > > 640 goto free_rcdev; > > > 641 > > > 642 pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress); > > > 643 usb_fill_bulk_urb(urb, usbdev, pipe, uirt->out, MAX_PACKET, > > > 644 uirt_out_callback, uirt); > > > 645 > > > 646 uirt->dev = &intf->dev; > > > 647 uirt->usbdev = usbdev; > > > 648 uirt->rc = rc; > > > 649 uirt->urb_out = urb; > > > 650 uirt->rx_state = RX_STATE_INTERSPACE_HIGH; > > > 651 > > > 652 err = usb_submit_urb(uirt->urb_in, GFP_KERNEL); > > > 653 if (err != 0) { > > > 654 dev_err(uirt->dev, "failed to submit read urb: %d\n", err); > > > 655 goto free_rcdev; > > > 656 } > > > 657 > > > 658 err = init_ftdi(usbdev); > > > 659 if (err) { > > > 660 dev_err(uirt->dev, "failed to setup ftdi: %d\n", err); > > > 661 goto kill_urbs; > > > 662 } > > > 663 > > > 664 err = uirt_setup(uirt); > > > 665 if (err) > > > 666 goto kill_urbs; > > > 667 > > > 668 usb_make_path(usbdev, uirt->phys, sizeof(uirt->phys)); > > > 669 > > > 670 rc->device_name = "USB-UIRT"; > > > 671 rc->driver_name = KBUILD_MODNAME; > > > 672 rc->input_phys = uirt->phys; > > > 673 usb_to_input_id(usbdev, &rc->input_id); > > > 674 rc->dev.parent = &intf->dev; > > > 675 rc->priv = uirt; > > > 676 rc->tx_ir = uirt_tx; > > > 677 rc->s_tx_carrier = uirt_set_tx_carrier; > > > 678 rc->s_learning_mode = uirt_set_rx_wideband; > > > 679 rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; > > > 680 rc->map_name = RC_MAP_RC6_MCE; > > > 681 rc->rx_resolution = UNIT_US; > > > 682 rc->timeout = IR_TIMEOUT; > > > 683 > > > 684 uirt_set_tx_carrier(rc, 38000); > > > 685 > > > 686 err = rc_register_device(rc); > > > 687 if (err) > > > 688 goto kill_urbs; > > > 689 > > > 690 usb_set_intfdata(intf, uirt); > > > 691 > > > 692 return 0; > > > 693 > > > 694 kill_urbs: > > > 695 usb_kill_urb(uirt->urb_in); > > > 696 usb_kill_urb(uirt->urb_out); > > > 697 free_rcdev: > > > 698 usb_free_urb(uirt->urb_in); > > > 699 usb_free_urb(uirt->urb_out); > > > 700 rc_free_device(rc); > > > 701 free_uirt: > > > 702 kfree(uirt->in); > > > 703 kfree(uirt->out); > > > 704 kfree(uirt); > > > 705 return err; > > > 706 } > > > 707 > > > > > > --- > > > 0-DAY CI Kernel Test Service, Intel Corporation > > > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org > > > >
diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig index d0a8326b75c2..cb1a2c65f920 100644 --- a/drivers/media/rc/Kconfig +++ b/drivers/media/rc/Kconfig @@ -471,6 +471,17 @@ config IR_TOY To compile this driver as a module, choose M here: the module will be called ir_toy. +config IR_UIRT + tristate "USB-UIRT" + depends on RC_CORE + depends on USB_ARCH_HAS_HCD + help + Say Y here if you want to use the USB-UIRT. See + http://www.usbuirt.com/ + + To compile this driver as a module, choose M here: the module will be + called uirt. + endif #RC_DEVICES endif #RC_CORE diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile index 692e9b6b203f..068036698747 100644 --- a/drivers/media/rc/Makefile +++ b/drivers/media/rc/Makefile @@ -50,3 +50,4 @@ obj-$(CONFIG_IR_SIR) += sir_ir.o obj-$(CONFIG_IR_MTK) += mtk-cir.o obj-$(CONFIG_RC_XBOX_DVD) += xbox_remote.o obj-$(CONFIG_IR_TOY) += ir_toy.o +obj-$(CONFIG_IR_UIRT) += uirt.o diff --git a/drivers/media/rc/uirt.c b/drivers/media/rc/uirt.c new file mode 100644 index 000000000000..975cf464113e --- /dev/null +++ b/drivers/media/rc/uirt.c @@ -0,0 +1,740 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +/* + * USB-UIRT + * + * Copyright (C) 2021 Sean Young <sean@mess.org> + * + * See http://www.usbuirt.com/USB-UIRT%20Command%20Protocol.doc + */ + +#include <linux/completion.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/slab.h> +#include <linux/usb/input.h> + +#include <media/rc-core.h> + +/* Copied from drivers/usb/serial/ftdi_sio.h */ +#define FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE 0x40 +#define FTDI_SIO_SET_BAUDRATE_REQUEST 3 + +#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST FTDI_SIO_SET_LATENCY_TIMER +#define FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE 0x40 + +#define FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE 0x40 +#define FTDI_SIO_SET_FLOW_CTRL_REQUEST FTDI_SIO_SET_FLOW_CTRL + +#define FTDI_SIO_SET_FLOW_CTRL 2 /* Set flow control register */ +#define FTDI_SIO_SET_LATENCY_TIMER 9 /* Set the latency timer */ + +#define FTDI_SIO_RTS_CTS_HS BIT(8) +#define FTDI_RS0_CTS BIT(4) + +static const u8 CMD_GETVERSION[] = { 0x23, 0xdd }; +static const u8 CMD_SETMODERAW[] = { 0x21, 0xdf }; +static const u8 CMD_SETWIDEBAND[] = { 0x24, 0xdc }; + +#define UNIT_US 50 +#define IR_TIMEOUT 12500 +#define MAX_PACKET 64 + +enum cmd_state { + CMD_STATE_GETVERSION, + CMD_STATE_SETMODERAW, + CMD_STATE_SETMODEWIDEBAND, + CMD_STATE_IRDATA, + CMD_STATE_DOTXRAW, + CMD_STATE_STREAMING_TX, +}; + +enum rx_state { + RX_STATE_INTERSPACE_HIGH, + RX_STATE_INTERSPACE_LOW, + RX_STATE_ON_HIGH, + RX_STATE_ON_LOW, + RX_STATE_FREQ_HIGH, + RX_STATE_FREQ_LOW, + RX_STATE_OFF_HIGH, + RX_STATE_OFF_LOW, +}; + +struct uirt { + struct device *dev; + struct usb_device *usbdev; + + struct rc_dev *rc; + struct urb *urb_in, *urb_out; + + u8 *in; + u8 *out; + struct completion cmd_done; + u8 freq; + u8 high; + bool wideband; + u32 last_duration; + + enum cmd_state cmd_state; + enum rx_state rx_state; + + void *tx_buf; + u32 tx_len; + + char phys[64]; +}; + +// read IR in raw mode +static void uirt_raw_mode(struct uirt *uirt, u32 offset, u32 len) +{ + uint i, duration; + + for (i = offset; i < len; i++) { + switch (uirt->rx_state) { + case RX_STATE_INTERSPACE_HIGH: + uirt->rx_state = RX_STATE_INTERSPACE_LOW; + break; + case RX_STATE_INTERSPACE_LOW: + uirt->rx_state = RX_STATE_ON_HIGH; + break; + case RX_STATE_ON_HIGH: + duration = uirt->in[i]; + if (duration == 0) + duration = 1; + + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .duration = duration * UNIT_US, + .pulse = true, + })); + + uirt->rx_state = RX_STATE_OFF_HIGH; + break; + case RX_STATE_OFF_HIGH: + if (uirt->in[i] == 0xff) { + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .duration = IR_TIMEOUT, + .timeout = true, + })); + uirt->rx_state = RX_STATE_INTERSPACE_HIGH; + break; + } + + duration = uirt->in[i]; + if (duration == 0) + duration = 1; + + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .duration = duration * UNIT_US, + .pulse = false, + })); + uirt->rx_state = RX_STATE_ON_HIGH; + break; + default: + WARN(1, "unreachable state"); + uirt->rx_state = RX_STATE_INTERSPACE_HIGH; + break; + } + } + + ir_raw_event_handle(uirt->rc); +} + +// Read IR in wideband mode. The byte stream is delivered in packets, +// and the values which come in two bytes may straddle two packets +static void uirt_wideband(struct uirt *uirt, u32 offset, u32 len) +{ + uint i, duration, carrier, pulses; + + for (i = offset; i < len; i++) { + switch (uirt->rx_state) { + case RX_STATE_INTERSPACE_HIGH: + uirt->rx_state = RX_STATE_INTERSPACE_LOW; + break; + case RX_STATE_INTERSPACE_LOW: + uirt->rx_state = RX_STATE_ON_HIGH; + break; + case RX_STATE_ON_HIGH: + uirt->high = uirt->in[i]; + uirt->rx_state = RX_STATE_ON_LOW; + break; + case RX_STATE_ON_LOW: + // duration is in 400ns units + duration = (uirt->high << 8) | uirt->in[i]; + if (duration < 3) + duration = 3; + uirt->last_duration = duration; + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .duration = DIV_ROUND_CLOSEST(duration * 2, 5), + .pulse = true, + })); + uirt->rx_state = RX_STATE_FREQ_HIGH; + break; + case RX_STATE_FREQ_HIGH: + if (uirt->in[i] & 0x80) { + uirt->high = uirt->in[i] & 0x7f; + uirt->rx_state = RX_STATE_FREQ_LOW; + break; + } + + uirt->high = 0; + fallthrough; + case RX_STATE_FREQ_LOW: + pulses = (uirt->high << 8) | uirt->in[i]; + if (pulses && uirt->last_duration) { + dev_dbg(uirt->dev, "carrier duration %u pulses %u", + uirt->last_duration, pulses); + + // calculate the Hz of pulses in duration 400ns units + carrier = DIV_ROUND_CLOSEST_ULL(pulses * 10000000ull, + uirt->last_duration * 4); + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .carrier = carrier, + .carrier_report = true, + })); + } + uirt->rx_state = RX_STATE_OFF_HIGH; + break; + case RX_STATE_OFF_HIGH: + if (uirt->in[i] == 0xff) { + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .duration = IR_TIMEOUT, + .timeout = true, + })); + uirt->rx_state = RX_STATE_INTERSPACE_HIGH; + } else { + uirt->high = uirt->in[i]; + uirt->rx_state = RX_STATE_OFF_LOW; + } + break; + case RX_STATE_OFF_LOW: + // duration is in 400ns units + duration = (uirt->high << 8) | uirt->in[i]; + if (duration < 3) + duration = 3; + ir_raw_event_store(uirt->rc, &((struct ir_raw_event) { + .duration = DIV_ROUND_CLOSEST(duration * 2, 5), + .pulse = false, + })); + uirt->rx_state = RX_STATE_ON_HIGH; + break; + } + } + + ir_raw_event_handle(uirt->rc); +} + +static void uirt_response(struct uirt *uirt, u32 len) +{ + int offset = 2; + int i; + + dev_dbg(uirt->dev, "state:%d data: %*phN\n", uirt->cmd_state, len, uirt->in); + + // Do we have more IR to transmit + if (uirt->cmd_state == CMD_STATE_STREAMING_TX && len >= 2 && + uirt->tx_len && uirt->in[0] & FTDI_RS0_CTS) { + u32 len; + int err; + + len = min_t(u32, uirt->tx_len, MAX_PACKET); + + memcpy(uirt->out, uirt->tx_buf, len); + uirt->urb_out->transfer_buffer_length = len; + + uirt->tx_len -= len; + uirt->tx_buf += len; + + err = usb_submit_urb(uirt->urb_out, GFP_ATOMIC); + if (err != 0) + dev_warn(uirt->dev, + "failed to submit out urb: %d\n", err); + } + + // if we only have two bytes, it just gives us the serial line status + if (len <= 2) + return; + + switch (uirt->cmd_state) { + case CMD_STATE_GETVERSION: + if (len >= 10) { + // check checksum + u8 checksum = 0; + + for (i = 2; i < len; i++) + checksum += uirt->in[i]; + + if (checksum != 0) { + dev_err(uirt->dev, "checksum does not match: %*phN\n", + len, uirt->in); + return; + } + + dev_info(uirt->dev, + "USB-UIRT firmware v%u.%u protocol v%u.%u %02u-%02u-%04u", + uirt->in[2], uirt->in[3], uirt->in[4], + uirt->in[5], uirt->in[6], uirt->in[7], + 2000 + uirt->in[8]); + + complete(&uirt->cmd_done); + uirt->cmd_state = CMD_STATE_IRDATA; + offset += 10; + } + break; + case CMD_STATE_DOTXRAW: + case CMD_STATE_STREAMING_TX: + case CMD_STATE_SETMODERAW: + case CMD_STATE_SETMODEWIDEBAND: + if (len >= 3) { + switch (uirt->in[2]) { + case 0x20: + // 0x20 transmitting is expected during streaming tx + if (uirt->cmd_state == CMD_STATE_STREAMING_TX) + return; + + if (uirt->cmd_state == CMD_STATE_DOTXRAW) + complete(&uirt->cmd_done); + else + dev_err(uirt->dev, "device transmitting"); + break; + case 0x21: + if (uirt->tx_len) { + dev_err(uirt->dev, "tx completed with %u left to send", + uirt->tx_len); + } else { + if (uirt->cmd_state == CMD_STATE_SETMODERAW) + uirt->wideband = false; + if (uirt->cmd_state == CMD_STATE_SETMODEWIDEBAND) + uirt->wideband = true; + + complete(&uirt->cmd_done); + } + break; + case 0x80: + dev_err(uirt->dev, "checksum error"); + break; + case 0x81: + dev_err(uirt->dev, "timeout"); + break; + case 0x82: + dev_err(uirt->dev, "command error"); + break; + default: + dev_err(uirt->dev, "unknown response"); + } + + uirt->cmd_state = CMD_STATE_IRDATA; + offset += 1; + } + default: + break; + } + + if (uirt->wideband) + uirt_wideband(uirt, offset, len); + else + uirt_raw_mode(uirt, offset, len); +} + +static void uirt_out_callback(struct urb *urb) +{ + struct uirt *uirt = urb->context; + + switch (urb->status) { + case 0: + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + return; + case -EPIPE: + default: + dev_warn(uirt->dev, "out urb status: %d\n", urb->status); + break; + } +} + +static void uirt_in_callback(struct urb *urb) +{ + struct uirt *uirt = urb->context; + int ret; + + if (urb->status == 0) + uirt_response(uirt, urb->actual_length); + else + dev_dbg(uirt->dev, "in urb status: %d\n", urb->status); + + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret && ret != -ENODEV) + dev_warn(uirt->dev, "failed to resubmit urb: %d\n", ret); +} + +static int uirt_command(struct uirt *uirt, const u8 *cmd, u32 cmd_len, + enum cmd_state state) +{ + int err; + + init_completion(&uirt->cmd_done); + + uirt->cmd_state = state; + + memcpy(uirt->out, cmd, cmd_len); + uirt->urb_out->transfer_buffer_length = cmd_len; + + err = usb_submit_urb(uirt->urb_out, GFP_KERNEL); + if (err != 0) { + uirt->cmd_state = CMD_STATE_IRDATA; + return err; + } + + if (!wait_for_completion_timeout(&uirt->cmd_done, + msecs_to_jiffies(USB_CTRL_SET_TIMEOUT))) { + usb_kill_urb(uirt->urb_out); + uirt->cmd_state = CMD_STATE_IRDATA; + return -ETIMEDOUT; + } + + return 0; +} + +static int uirt_setup(struct uirt *uirt) +{ + int err; + + err = uirt_command(uirt, CMD_SETMODERAW, sizeof(CMD_SETMODERAW), + CMD_STATE_SETMODERAW); + if (err) { + dev_err(uirt->dev, "set mode raw command failed: %d\n", + err); + return err; + } + + err = uirt_command(uirt, CMD_GETVERSION, + sizeof(CMD_GETVERSION), CMD_STATE_GETVERSION); + if (err != 0) + dev_err(uirt->dev, "get version command failed: %d\n", + err); + + return err; +} + +// IR TX when the data can fit into a single packet (i.e 64 bytes). +// count must be no larger than 24, else we might overflow the buffer. +static int uirt_short_tx(struct rc_dev *rc, uint *txbuf, uint count) +{ + struct uirt *uirt = rc->priv; + u8 out[MAX_PACKET], checksum; + u32 i, dest, width, freq; + int err; + + out[0] = 0x36; // DOTXRAW + out[2] = uirt->freq; // carrier frequency + out[3] = 1; // number of repeats + + dest = 7; + + freq = uirt->freq & 0x7f; + + for (i = 0; i < count; i++) { + // width = (us / freq) * 2.5 + width = DIV_ROUND_CLOSEST(txbuf[i] * 5, freq * 2); + + if (width == 0) + width = 1; + else if (width > 127) + out[dest++] = (width >> 8) | 0x80; + + out[dest++] = width; + } + + // length of RAWSTRUCT + 1 + out[1] = dest - 1; + // number of bytes in encoded pulse/space + out[6] = dest - 7; + + // checksum + for (i = 0, checksum = 0; i < dest; i++) + checksum -= out[i]; + + out[dest++] = checksum; + + uirt->tx_buf = NULL; + uirt->tx_len = 0; + + err = uirt_command(uirt, out, dest, CMD_STATE_DOTXRAW); + if (err != 0) + return err; + + return count; +} + +static int uirt_tx(struct rc_dev *rc, uint *txbuf, uint count) +{ + struct uirt *uirt = rc->priv; + u8 *out; + u32 i, dest, unit_raw, freq, len; + int err; + + // streaming tx does not work for short IR; use non-streaming + // tx for short IR + if (count <= 24) + return uirt_short_tx(rc, txbuf, count); + + out = kmalloc(count * 2 + 3, GFP_KERNEL); + if (!out) + return -ENOMEM; + + out[0] = 0x25; // Streaming Transmit + out[1] = 0xdb; // checksum over command (just the previous byte) + out[2] = uirt->freq; // carrier frequency + + dest = 3; + + freq = uirt->freq & 0x7f; + + for (i = 0; i < count; i++) { + // width = (us / freq) * 2.5 + unit_raw = DIV_ROUND_CLOSEST(txbuf[i] * 5, freq * 2); + + if (unit_raw == 0) + unit_raw = 1; + else if (unit_raw > 127) + out[dest++] = (unit_raw >> 8) | 0x80; + + out[dest++] = unit_raw; + } + + len = min_t(u32, dest, MAX_PACKET); + + uirt->tx_buf = out + len; + uirt->tx_len = dest - len; + + err = uirt_command(uirt, out, len, CMD_STATE_STREAMING_TX); + kfree(out); + if (err != 0) + return err; + + return count; +} + +static int uirt_set_tx_carrier(struct rc_dev *dev, u32 carrier) +{ + struct uirt *uirt = dev->priv; + + if (carrier == 0) + // bit 7 must be 1 for unmodulated, lower bits need to + // be something that makes sense for tx + uirt->freq = 0xc0; + else if (carrier >= 20000 && carrier <= 500000) + // bit 7 must be 0 for modulated + uirt->freq = 2500000 / carrier; + else + return -EINVAL; + + return 0; +} + +static int uirt_set_rx_wideband(struct rc_dev *dev, int enable) +{ + struct uirt *uirt = dev->priv; + int err; + + if (enable) + err = uirt_command(uirt, CMD_SETWIDEBAND, + sizeof(CMD_SETWIDEBAND), + CMD_STATE_SETMODEWIDEBAND); + else + err = uirt_command(uirt, CMD_SETMODERAW, + sizeof(CMD_SETMODERAW), + CMD_STATE_SETMODERAW); + + if (err) { + dev_err(uirt->dev, "set mode command failed: %d\n", + err); + return err; + } + + return 0; +} + +static int init_ftdi(struct usb_device *udev) +{ + int err; + + // set the baud rate + err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + FTDI_SIO_SET_BAUDRATE_REQUEST, + FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE, + 0x4009, 0x0001, + NULL, 0, USB_CTRL_SET_TIMEOUT); + if (err) + return err; + + // enabling rts/cts flow control + err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + FTDI_SIO_SET_FLOW_CTRL_REQUEST, + FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE, + 0, FTDI_SIO_RTS_CTS_HS, + NULL, 0, USB_CTRL_SET_TIMEOUT); + if (err) + return err; + + // Set latency in milliseconds. The USB-UIRT will generate a + // urb every latency milliseconds (IR or not), so this should be + // set as high as possible to reduce interrupts. However, setting + // this value too high will mean there is a preceptible delay for + // IR being processed and a key press being registered. + // + // Choose 50ms as a compromise. + return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + FTDI_SIO_SET_LATENCY_TIMER_REQUEST, + FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE, + 50, 0, + NULL, 0, USB_CTRL_SET_TIMEOUT); +} + +static int uirt_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct usb_device *usbdev = interface_to_usbdev(intf); + struct usb_endpoint_descriptor *ep_in; + struct usb_endpoint_descriptor *ep_out; + struct uirt *uirt; + struct rc_dev *rc; + struct urb *urb; + int pipe, err; + + if (usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out, NULL, NULL) || + usb_endpoint_maxp(ep_in) != MAX_PACKET || + usb_endpoint_maxp(ep_out) != MAX_PACKET) { + dev_err(&intf->dev, "required endpoints not found\n"); + return -ENODEV; + } + + uirt = kzalloc(sizeof(*uirt), GFP_KERNEL); + if (!uirt) + return -ENOMEM; + + uirt->in = kmalloc(MAX_PACKET, GFP_KERNEL); + if (!uirt->in) + goto free_uirt; + + uirt->out = kmalloc(MAX_PACKET, GFP_KERNEL); + if (!uirt->out) + goto free_uirt; + + rc = rc_allocate_device(RC_DRIVER_IR_RAW); + if (!rc) + goto free_uirt; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) + goto free_rcdev; + + pipe = usb_rcvbulkpipe(usbdev, ep_in->bEndpointAddress); + usb_fill_bulk_urb(urb, usbdev, pipe, uirt->in, MAX_PACKET, + uirt_in_callback, uirt); + uirt->urb_in = urb; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) + goto free_rcdev; + + pipe = usb_sndbulkpipe(usbdev, ep_out->bEndpointAddress); + usb_fill_bulk_urb(urb, usbdev, pipe, uirt->out, MAX_PACKET, + uirt_out_callback, uirt); + + uirt->dev = &intf->dev; + uirt->usbdev = usbdev; + uirt->rc = rc; + uirt->urb_out = urb; + uirt->rx_state = RX_STATE_INTERSPACE_HIGH; + + err = usb_submit_urb(uirt->urb_in, GFP_KERNEL); + if (err != 0) { + dev_err(uirt->dev, "failed to submit read urb: %d\n", err); + goto free_rcdev; + } + + err = init_ftdi(usbdev); + if (err) { + dev_err(uirt->dev, "failed to setup ftdi: %d\n", err); + goto kill_urbs; + } + + err = uirt_setup(uirt); + if (err) + goto kill_urbs; + + usb_make_path(usbdev, uirt->phys, sizeof(uirt->phys)); + + rc->device_name = "USB-UIRT"; + rc->driver_name = KBUILD_MODNAME; + rc->input_phys = uirt->phys; + usb_to_input_id(usbdev, &rc->input_id); + rc->dev.parent = &intf->dev; + rc->priv = uirt; + rc->tx_ir = uirt_tx; + rc->s_tx_carrier = uirt_set_tx_carrier; + rc->s_learning_mode = uirt_set_rx_wideband; + rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; + rc->map_name = RC_MAP_RC6_MCE; + rc->rx_resolution = UNIT_US; + rc->timeout = IR_TIMEOUT; + + uirt_set_tx_carrier(rc, 38000); + + err = rc_register_device(rc); + if (err) + goto kill_urbs; + + usb_set_intfdata(intf, uirt); + + return 0; + +kill_urbs: + usb_kill_urb(uirt->urb_in); + usb_kill_urb(uirt->urb_out); +free_rcdev: + usb_free_urb(uirt->urb_in); + usb_free_urb(uirt->urb_out); + rc_free_device(rc); +free_uirt: + kfree(uirt->in); + kfree(uirt->out); + kfree(uirt); + return err; +} + +static void uirt_disconnect(struct usb_interface *intf) +{ + struct uirt *ir = usb_get_intfdata(intf); + + rc_unregister_device(ir->rc); + usb_set_intfdata(intf, NULL); + usb_kill_urb(ir->urb_in); + usb_kill_urb(ir->urb_out); + usb_free_urb(ir->urb_in); + usb_free_urb(ir->urb_out); + kfree(ir->in); + kfree(ir->out); + kfree(ir); +} + +static const struct usb_device_id uirt_table[] = { + { USB_DEVICE(0x0403, 0xf850) }, + { } +}; + +static struct usb_driver uirt_driver = { + .name = KBUILD_MODNAME, + .probe = uirt_probe, + .disconnect = uirt_disconnect, + .id_table = uirt_table, +}; + +module_usb_driver(uirt_driver); + +MODULE_AUTHOR("Sean Young <sean@mess.org>"); +MODULE_DESCRIPTION("USB-UIRT driver"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(usb, uirt_table);
This device uses an ftdi usb serial port, so this driver has a tiny amount of usb ftdi code. It would be preferable to connect this driver via serdev or line-discipline, but unfortunately neither support hotplugging yet. See http://www.usbuirt.com/ Signed-off-by: Sean Young <sean@mess.org> --- drivers/media/rc/Kconfig | 11 + drivers/media/rc/Makefile | 1 + drivers/media/rc/uirt.c | 740 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 752 insertions(+) create mode 100644 drivers/media/rc/uirt.c