On 20/05/16 11:31, Roger Quadros wrote: > On 18/05/16 15:59, Roger Quadros wrote: >> Hi Peter, >> >> On 18/05/16 10:45, Peter Chen wrote: >>> >>> >>> On Mon, May 16, 2016 at 5:00 PM, Roger Quadros <rogerq@xxxxxx <mailto:rogerq@xxxxxx>> wrote: >>> >>> On 13/05/16 13:03, Roger Quadros wrote: >>> > It provides APIs for the following tasks >>> > >>> > - Registering an OTG/dual-role capable controller >>> > - Registering Host and Gadget controllers to OTG core >>> > - Providing inputs to and kicking the OTG state machine >>> > >>> > Provide a dual-role device (DRD) state machine. >>> > DRD mode is a reduced functionality OTG mode. In this mode >>> > we don't support SRP, HNP and dynamic role-swap. >>> > >>> > In DRD operation, the controller mode (Host or Peripheral) >>> > is decided based on the ID pin status. Once a cable plug (Type-A >>> > or Type-B) is attached the controller selects the state >>> > and doesn't change till the cable in unplugged and a different >>> > cable type is inserted. >>> > >>> > As we don't need most of the complex OTG states and OTG timers >>> > we implement a lean DRD state machine in usb-otg.c. >>> > The DRD state machine is only interested in 2 hardware inputs >>> > 'id' and 'b_sess_vld'. >>> > >>> > Signed-off-by: Roger Quadros <rogerq@xxxxxx <mailto:rogerq@xxxxxx>> >>> > --- >>> > drivers/usb/common/Makefile | 2 +- >>> > drivers/usb/common/usb-otg.c | 1042 ++++++++++++++++++++++++++++++++++++++++++ >>> > drivers/usb/core/Kconfig | 4 +- >>> > include/linux/usb/gadget.h | 2 + >>> > include/linux/usb/hcd.h | 1 + >>> > include/linux/usb/otg-fsm.h | 7 + >>> > include/linux/usb/otg.h | 154 ++++++- >>> > 7 files changed, 1206 insertions(+), 6 deletions(-) >>> > create mode 100644 drivers/usb/common/usb-otg.c >>> >>> >>> This patch causes the following build issues when CONFIG_USB_GADGET=m, CONFIG_USB=m, >>> CONFIG_USB_COMMON=m and CONFIG_USB_OTG=y >>> >>> ERROR: "usb_otg_register_gadget" [drivers/usb/gadget/udc/udc-core.ko] undefined! >>> ERROR: "usb_otg_unregister_gadget" [drivers/usb/gadget/udc/udc-core.ko] undefined! >>> ERROR: "usb_otg_register_hcd" [drivers/usb/core/usbcore.ko] undefined! >>> ERROR: "usb_otg_unregister_hcd" [drivers/usb/core/usbcore.ko] undefined! >>> ERROR: "otg_statemachine" [drivers/usb/chipidea/ci_hdrc.ko] undefined! >>> scripts/Makefile.modpost:91: recipe for target '__modpost' failed >>> make[1]: *** [__modpost] Error 1 >>> Makefile:1141: recipe for target 'modules' failed >>> make: *** [modules] Error 2 >>> make: *** Waiting for unfinished jobs.... >>> >>> drivers/built-in.o: In function `drd_set_state': >>> usb-otg.c:(.text+0x2b4242): undefined reference to `usb_otg_state_string' >>> drivers/built-in.o: In function `drd_statemachine': >>> (.text+0x2b4b4c): undefined reference to `usb_otg_state_string' >>> Makefile:937: recipe for target 'vmlinux' failed >>> >>> I'll fix it up with the following diff. >>> >>> diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile >>> index dca7856..16a5b55 100644 >>> --- a/drivers/usb/Makefile >>> +++ b/drivers/usb/Makefile >>> @@ -59,5 +59,6 @@ obj-$(CONFIG_USB_RENESAS_USBHS) += renesas_usbhs/ >>> obj-$(CONFIG_USB_GADGET) += gadget/ >>> >>> obj-$(CONFIG_USB_COMMON) += common/ >>> +obj-$(CONFIG_USB_OTG) += common/ >>> >>> obj-$(CONFIG_USBIP_CORE) += usbip/ >>> diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c >>> index 77048aa..17e449e 100644 >>> --- a/drivers/usb/common/usb-otg.c >>> +++ b/drivers/usb/common/usb-otg.c >>> @@ -56,6 +56,30 @@ static int usb_otg_hcd_is_primary_hcd(struct usb_hcd *hcd) >>> return hcd == hcd->primary_hcd; >>> } >>> >>> +static const char *otg_state_string(enum usb_otg_state state) >>> +{ >>> + static const char *const names[] = { >>> + [OTG_STATE_A_IDLE] = "a_idle", >>> + [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", >>> + [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", >>> + [OTG_STATE_A_HOST] = "a_host", >>> + [OTG_STATE_A_SUSPEND] = "a_suspend", >>> + [OTG_STATE_A_PERIPHERAL] = "a_peripheral", >>> + [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", >>> + [OTG_STATE_A_VBUS_ERR] = "a_vbus_err", >>> + [OTG_STATE_B_IDLE] = "b_idle", >>> + [OTG_STATE_B_SRP_INIT] = "b_srp_init", >>> + [OTG_STATE_B_PERIPHERAL] = "b_peripheral", >>> + [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", >>> + [OTG_STATE_B_HOST] = "b_host", >>> + }; >>> + >>> + if (state < 0 || state >= ARRAY_SIZE(names)) >>> + return "UNDEFINED"; >>> + >>> + return names[state]; >>> +} >>> + >>> >>> >>> >>> From my point, make another copy for otg stuff is not a good way, >>> could we make folder under usb/ named otg for dedicated otg stuffs, >>> in that case, build otg stuffs can not depend on USB_COMMON. >> >> OK. I can try that. I'll delete otg_state_string from usb-common.c and >> move it into usb/otg/usb-otg.c >> >> I'll also move usb-otg-fsm.c to usb/otg/. > > But we can't delete usb_otg_state_string() from usb-common.c. That is used at a > number of places whether OTG is enabled or not. > > One option is to make usb-common built in when otg is enabled. What do you say? > This should also get solved if we make USB_OTG tristate so that it is same as USB_COMMON. However I haven't had success in making Kconfig behave like this. USB_OTG = y if USB == y && GADGET = m USB_OTG = y if USB == m && GADGET = y Is there any Kconfig trickery to get this behaviour? cheers, -roger > cheers, > -roger > >>> /** >>> * Check if the OTG device is in our wait list and return >>> * otg_wait_data, else NULL. >>> @@ -433,7 +457,7 @@ static void drd_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state) >>> >>> fsm->state_changed = 1; >>> dev_dbg(otg->dev, "otg: set state: %s\n", >>> - usb_otg_state_string(new_state)); >>> + otg_state_string(new_state)); >>> switch (new_state) { >>> case OTG_STATE_B_IDLE: >>> drd_set_protocol(fsm, PROTO_UNDEF); >>> @@ -449,7 +473,7 @@ static void drd_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state) >>> break; >>> default: >>> dev_warn(otg->dev, "%s: otg: invalid state: %s\n", >>> - __func__, usb_otg_state_string(new_state)); >>> + __func__, otg_state_string(new_state)); >>> break; >>> } >>> >>> @@ -507,7 +531,7 @@ int drd_statemachine(struct usb_otg *otg) >>> >>> default: >>> dev_err(otg->dev, "%s: otg: invalid usb-drd state: %s\n", >>> - __func__, usb_otg_state_string(state)); >>> + __func__, otg_state_string(state)); >>> break; >>> } >>> >>> -- >>> cheers, >>> -roger >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-usb" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx <mailto:majordomo@xxxxxxxxxxxxxxx> >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >>> >>> >>> >>> -- >>> BR, >>> Peter Chen >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-omap" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
