From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/usb/mtu3/mtu3_gadget.c | 772 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 772 insertions(+) create mode 100644 drivers/usb/mtu3/mtu3_gadget.c (limited to 'drivers/usb/mtu3/mtu3_gadget.c') diff --git a/drivers/usb/mtu3/mtu3_gadget.c b/drivers/usb/mtu3/mtu3_gadget.c new file mode 100644 index 000000000..80236e7b0 --- /dev/null +++ b/drivers/usb/mtu3/mtu3_gadget.c @@ -0,0 +1,772 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * mtu3_gadget.c - MediaTek usb3 DRD peripheral support + * + * Copyright (C) 2016 MediaTek Inc. + * + * Author: Chunfeng Yun + */ + +#include "mtu3.h" +#include "mtu3_trace.h" + +void mtu3_req_complete(struct mtu3_ep *mep, + struct usb_request *req, int status) +__releases(mep->mtu->lock) +__acquires(mep->mtu->lock) +{ + struct mtu3_request *mreq = to_mtu3_request(req); + struct mtu3 *mtu = mreq->mtu; + + list_del(&mreq->list); + if (req->status == -EINPROGRESS) + req->status = status; + + trace_mtu3_req_complete(mreq); + spin_unlock(&mtu->lock); + + /* ep0 makes use of PIO, needn't unmap it */ + if (mep->epnum) + usb_gadget_unmap_request(&mtu->g, req, mep->is_in); + + dev_dbg(mtu->dev, "%s complete req: %p, sts %d, %d/%d\n", + mep->name, req, req->status, req->actual, req->length); + + usb_gadget_giveback_request(&mep->ep, req); + spin_lock(&mtu->lock); +} + +static void nuke(struct mtu3_ep *mep, const int status) +{ + struct mtu3_request *mreq = NULL; + + if (list_empty(&mep->req_list)) + return; + + dev_dbg(mep->mtu->dev, "abort %s's req: sts %d\n", mep->name, status); + + /* exclude EP0 */ + if (mep->epnum) + mtu3_qmu_flush(mep); + + while (!list_empty(&mep->req_list)) { + mreq = list_first_entry(&mep->req_list, + struct mtu3_request, list); + mtu3_req_complete(mep, &mreq->request, status); + } +} + +static int mtu3_ep_enable(struct mtu3_ep *mep) +{ + const struct usb_endpoint_descriptor *desc; + const struct usb_ss_ep_comp_descriptor *comp_desc; + struct mtu3 *mtu = mep->mtu; + u32 interval = 0; + u32 mult = 0; + u32 burst = 0; + int ret; + + desc = mep->desc; + comp_desc = mep->comp_desc; + mep->type = usb_endpoint_type(desc); + mep->maxp = usb_endpoint_maxp(desc); + + switch (mtu->g.speed) { + case USB_SPEED_SUPER: + case USB_SPEED_SUPER_PLUS: + if (usb_endpoint_xfer_int(desc) || + usb_endpoint_xfer_isoc(desc)) { + interval = desc->bInterval; + interval = clamp_val(interval, 1, 16); + if (usb_endpoint_xfer_isoc(desc) && comp_desc) + mult = comp_desc->bmAttributes; + } + if (comp_desc) + burst = comp_desc->bMaxBurst; + + break; + case USB_SPEED_HIGH: + if (usb_endpoint_xfer_isoc(desc) || + usb_endpoint_xfer_int(desc)) { + interval = desc->bInterval; + interval = clamp_val(interval, 1, 16); + mult = usb_endpoint_maxp_mult(desc) - 1; + } + break; + case USB_SPEED_FULL: + if (usb_endpoint_xfer_isoc(desc)) + interval = clamp_val(desc->bInterval, 1, 16); + else if (usb_endpoint_xfer_int(desc)) + interval = clamp_val(desc->bInterval, 1, 255); + + break; + default: + break; /*others are ignored */ + } + + dev_dbg(mtu->dev, "%s maxp:%d, interval:%d, burst:%d, mult:%d\n", + __func__, mep->maxp, interval, burst, mult); + + mep->ep.maxpacket = mep->maxp; + mep->ep.desc = desc; + mep->ep.comp_desc = comp_desc; + + /* slot mainly affects bulk/isoc transfer, so ignore int */ + mep->slot = usb_endpoint_xfer_int(desc) ? 0 : mtu->slot; + + ret = mtu3_config_ep(mtu, mep, interval, burst, mult); + if (ret < 0) + return ret; + + ret = mtu3_gpd_ring_alloc(mep); + if (ret < 0) { + mtu3_deconfig_ep(mtu, mep); + return ret; + } + + mtu3_qmu_start(mep); + + return 0; +} + +static int mtu3_ep_disable(struct mtu3_ep *mep) +{ + struct mtu3 *mtu = mep->mtu; + + mtu3_qmu_stop(mep); + + /* abort all pending requests */ + nuke(mep, -ESHUTDOWN); + mtu3_deconfig_ep(mtu, mep); + mtu3_gpd_ring_free(mep); + + mep->desc = NULL; + mep->ep.desc = NULL; + mep->comp_desc = NULL; + mep->type = 0; + mep->flags = 0; + + return 0; +} + +static int mtu3_gadget_ep_enable(struct usb_ep *ep, + const struct usb_endpoint_descriptor *desc) +{ + struct mtu3_ep *mep; + struct mtu3 *mtu; + unsigned long flags; + int ret = -EINVAL; + + if (!ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) { + pr_debug("%s invalid parameters\n", __func__); + return -EINVAL; + } + + if (!desc->wMaxPacketSize) { + pr_debug("%s missing wMaxPacketSize\n", __func__); + return -EINVAL; + } + mep = to_mtu3_ep(ep); + mtu = mep->mtu; + + /* check ep number and direction against endpoint */ + if (usb_endpoint_num(desc) != mep->epnum) + return -EINVAL; + + if (!!usb_endpoint_dir_in(desc) ^ !!mep->is_in) + return -EINVAL; + + dev_dbg(mtu->dev, "%s %s\n", __func__, ep->name); + + if (mep->flags & MTU3_EP_ENABLED) { + dev_WARN_ONCE(mtu->dev, true, "%s is already enabled\n", + mep->name); + return 0; + } + + spin_lock_irqsave(&mtu->lock, flags); + mep->desc = desc; + mep->comp_desc = ep->comp_desc; + + ret = mtu3_ep_enable(mep); + if (ret) + goto error; + + mep->flags = MTU3_EP_ENABLED; + mtu->active_ep++; + +error: + spin_unlock_irqrestore(&mtu->lock, flags); + + dev_dbg(mtu->dev, "%s active_ep=%d\n", __func__, mtu->active_ep); + trace_mtu3_gadget_ep_enable(mep); + + return ret; +} + +static int mtu3_gadget_ep_disable(struct usb_ep *ep) +{ + struct mtu3_ep *mep = to_mtu3_ep(ep); + struct mtu3 *mtu = mep->mtu; + unsigned long flags; + + dev_dbg(mtu->dev, "%s %s\n", __func__, mep->name); + trace_mtu3_gadget_ep_disable(mep); + + if (!(mep->flags & MTU3_EP_ENABLED)) { + dev_warn(mtu->dev, "%s is already disabled\n", mep->name); + return 0; + } + + spin_lock_irqsave(&mtu->lock, flags); + mtu3_ep_disable(mep); + mep->flags = 0; + mtu->active_ep--; + spin_unlock_irqrestore(&(mtu->lock), flags); + + dev_dbg(mtu->dev, "%s active_ep=%d, mtu3 is_active=%d\n", + __func__, mtu->active_ep, mtu->is_active); + + return 0; +} + +struct usb_request *mtu3_alloc_request(struct usb_ep *ep, gfp_t gfp_flags) +{ + struct mtu3_ep *mep = to_mtu3_ep(ep); + struct mtu3_request *mreq; + + mreq = kzalloc(sizeof(*mreq), gfp_flags); + if (!mreq) + return NULL; + + mreq->request.dma = DMA_ADDR_INVALID; + mreq->epnum = mep->epnum; + mreq->mep = mep; + INIT_LIST_HEAD(&mreq->list); + trace_mtu3_alloc_request(mreq); + + return &mreq->request; +} + +void mtu3_free_request(struct usb_ep *ep, struct usb_request *req) +{ + struct mtu3_request *mreq = to_mtu3_request(req); + + trace_mtu3_free_request(mreq); + kfree(mreq); +} + +static int mtu3_gadget_queue(struct usb_ep *ep, + struct usb_request *req, gfp_t gfp_flags) +{ + struct mtu3_ep *mep = to_mtu3_ep(ep); + struct mtu3_request *mreq = to_mtu3_request(req); + struct mtu3 *mtu = mep->mtu; + unsigned long flags; + int ret = 0; + + if (!req->buf) + return -ENODATA; + + if (mreq->mep != mep) + return -EINVAL; + + dev_dbg(mtu->dev, "%s %s EP%d(%s), req=%p, maxp=%d, len#%d\n", + __func__, mep->is_in ? "TX" : "RX", mreq->epnum, ep->name, + mreq, ep->maxpacket, mreq->request.length); + + if (req->length > GPD_BUF_SIZE || + (mtu->gen2cp && req->length > GPD_BUF_SIZE_EL)) { + dev_warn(mtu->dev, + "req length > supported MAX:%d requested:%d\n", + mtu->gen2cp ? GPD_BUF_SIZE_EL : GPD_BUF_SIZE, + req->length); + return -EOPNOTSUPP; + } + + /* don't queue if the ep is down */ + if (!mep->desc) { + dev_dbg(mtu->dev, "req=%p queued to %s while it's disabled\n", + req, ep->name); + return -ESHUTDOWN; + } + + mreq->mtu = mtu; + mreq->request.actual = 0; + mreq->request.status = -EINPROGRESS; + + ret = usb_gadget_map_request(&mtu->g, req, mep->is_in); + if (ret) { + dev_err(mtu->dev, "dma mapping failed\n"); + return ret; + } + + spin_lock_irqsave(&mtu->lock, flags); + + if (mtu3_prepare_transfer(mep)) { + ret = -EAGAIN; + goto error; + } + + list_add_tail(&mreq->list, &mep->req_list); + mtu3_insert_gpd(mep, mreq); + mtu3_qmu_resume(mep); + +error: + spin_unlock_irqrestore(&mtu->lock, flags); + trace_mtu3_gadget_queue(mreq); + + return ret; +} + +static int mtu3_gadget_dequeue(struct usb_ep *ep, struct usb_request *req) +{ + struct mtu3_ep *mep = to_mtu3_ep(ep); + struct mtu3_request *mreq = to_mtu3_request(req); + struct mtu3_request *r; + struct mtu3 *mtu = mep->mtu; + unsigned long flags; + int ret = 0; + + if (mreq->mep != mep) + return -EINVAL; + + dev_dbg(mtu->dev, "%s : req=%p\n", __func__, req); + trace_mtu3_gadget_dequeue(mreq); + + spin_lock_irqsave(&mtu->lock, flags); + + list_for_each_entry(r, &mep->req_list, list) { + if (r == mreq) + break; + } + if (r != mreq) { + dev_dbg(mtu->dev, "req=%p not queued to %s\n", req, ep->name); + ret = -EINVAL; + goto done; + } + + mtu3_qmu_flush(mep); /* REVISIT: set BPS ?? */ + mtu3_req_complete(mep, req, -ECONNRESET); + mtu3_qmu_start(mep); + +done: + spin_unlock_irqrestore(&mtu->lock, flags); + + return ret; +} + +/* + * Set or clear the halt bit of an EP. + * A halted EP won't TX/RX any data but will queue requests. + */ +static int mtu3_gadget_ep_set_halt(struct usb_ep *ep, int value) +{ + struct mtu3_ep *mep = to_mtu3_ep(ep); + struct mtu3 *mtu = mep->mtu; + struct mtu3_request *mreq; + unsigned long flags; + int ret = 0; + + dev_dbg(mtu->dev, "%s : %s...", __func__, ep->name); + + spin_lock_irqsave(&mtu->lock, flags); + + if (mep->type == USB_ENDPOINT_XFER_ISOC) { + ret = -EINVAL; + goto done; + } + + mreq = next_request(mep); + if (value) { + /* + * If there is not request for TX-EP, QMU will not transfer + * data to TX-FIFO, so no need check whether TX-FIFO + * holds bytes or not here + */ + if (mreq) { + dev_dbg(mtu->dev, "req in progress, cannot halt %s\n", + ep->name); + ret = -EAGAIN; + goto done; + } + } else { + mep->flags &= ~MTU3_EP_WEDGE; + } + + dev_dbg(mtu->dev, "%s %s stall\n", ep->name, value ? "set" : "clear"); + + mtu3_ep_stall_set(mep, value); + +done: + spin_unlock_irqrestore(&mtu->lock, flags); + trace_mtu3_gadget_ep_set_halt(mep); + + return ret; +} + +/* Sets the halt feature with the clear requests ignored */ +static int mtu3_gadget_ep_set_wedge(struct usb_ep *ep) +{ + struct mtu3_ep *mep = to_mtu3_ep(ep); + + mep->flags |= MTU3_EP_WEDGE; + + return usb_ep_set_halt(ep); +} + +static const struct usb_ep_ops mtu3_ep_ops = { + .enable = mtu3_gadget_ep_enable, + .disable = mtu3_gadget_ep_disable, + .alloc_request = mtu3_alloc_request, + .free_request = mtu3_free_request, + .queue = mtu3_gadget_queue, + .dequeue = mtu3_gadget_dequeue, + .set_halt = mtu3_gadget_ep_set_halt, + .set_wedge = mtu3_gadget_ep_set_wedge, +}; + +static int mtu3_gadget_get_frame(struct usb_gadget *gadget) +{ + struct mtu3 *mtu = gadget_to_mtu3(gadget); + + return (int)mtu3_readl(mtu->mac_base, U3D_USB20_FRAME_NUM); +} + +static void function_wake_notif(struct mtu3 *mtu, u8 intf) +{ + mtu3_writel(mtu->mac_base, U3D_DEV_NOTIF_0, + TYPE_FUNCTION_WAKE | DEV_NOTIF_VAL_FW(intf)); + mtu3_setbits(mtu->mac_base, U3D_DEV_NOTIF_0, SEND_DEV_NOTIF); +} + +static int mtu3_gadget_wakeup(struct usb_gadget *gadget) +{ + struct mtu3 *mtu = gadget_to_mtu3(gadget); + unsigned long flags; + + dev_dbg(mtu->dev, "%s\n", __func__); + + /* remote wakeup feature is not enabled by host */ + if (!mtu->may_wakeup) + return -EOPNOTSUPP; + + spin_lock_irqsave(&mtu->lock, flags); + if (mtu->g.speed >= USB_SPEED_SUPER) { + /* + * class driver may do function wakeup even UFP is in U0, + * and UX_EXIT only takes effect in U1/U2/U3; + */ + mtu3_setbits(mtu->mac_base, U3D_LINK_POWER_CONTROL, UX_EXIT); + /* + * Assume there's only one function on the composite device + * and enable remote wake for the first interface. + * FIXME if the IAD (interface association descriptor) shows + * there is more than one function. + */ + function_wake_notif(mtu, 0); + } else { + mtu3_setbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME); + spin_unlock_irqrestore(&mtu->lock, flags); + usleep_range(10000, 11000); + spin_lock_irqsave(&mtu->lock, flags); + mtu3_clrbits(mtu->mac_base, U3D_POWER_MANAGEMENT, RESUME); + } + spin_unlock_irqrestore(&mtu->lock, flags); + return 0; +} + +static int mtu3_gadget_set_self_powered(struct usb_gadget *gadget, + int is_selfpowered) +{ + struct mtu3 *mtu = gadget_to_mtu3(gadget); + + mtu->is_self_powered = !!is_selfpowered; + return 0; +} + +static int mtu3_gadget_pullup(struct usb_gadget *gadget, int is_on) +{ + struct mtu3 *mtu = gadget_to_mtu3(gadget); + unsigned long flags; + + dev_dbg(mtu->dev, "%s (%s) for %sactive device\n", __func__, + is_on ? "on" : "off", mtu->is_active ? "" : "in"); + + pm_runtime_get_sync(mtu->dev); + + /* we'd rather not pullup unless the device is active. */ + spin_lock_irqsave(&mtu->lock, flags); + + is_on = !!is_on; + if (!mtu->is_active) { + /* save it for mtu3_start() to process the request */ + mtu->softconnect = is_on; + } else if (is_on != mtu->softconnect) { + mtu->softconnect = is_on; + mtu3_dev_on_off(mtu, is_on); + } + + spin_unlock_irqrestore(&mtu->lock, flags); + pm_runtime_put(mtu->dev); + + return 0; +} + +static int mtu3_gadget_start(struct usb_gadget *gadget, + struct usb_gadget_driver *driver) +{ + struct mtu3 *mtu = gadget_to_mtu3(gadget); + unsigned long flags; + + if (mtu->gadget_driver) { + dev_err(mtu->dev, "%s is already bound to %s\n", + mtu->g.name, mtu->gadget_driver->driver.name); + return -EBUSY; + } + + dev_dbg(mtu->dev, "bind driver %s\n", driver->function); + pm_runtime_get_sync(mtu->dev); + + spin_lock_irqsave(&mtu->lock, flags); + + mtu->softconnect = 0; + mtu->gadget_driver = driver; + + if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL) + mtu3_start(mtu); + + spin_unlock_irqrestore(&mtu->lock, flags); + pm_runtime_put(mtu->dev); + + return 0; +} + +static void stop_activity(struct mtu3 *mtu) +{ + struct usb_gadget_driver *driver = mtu->gadget_driver; + int i; + + /* don't disconnect if it's not connected */ + if (mtu->g.speed == USB_SPEED_UNKNOWN) + driver = NULL; + else + mtu->g.speed = USB_SPEED_UNKNOWN; + + /* deactivate the hardware */ + if (mtu->softconnect) { + mtu->softconnect = 0; + mtu3_dev_on_off(mtu, 0); + } + + /* + * killing any outstanding requests will quiesce the driver; + * then report disconnect + */ + nuke(mtu->ep0, -ESHUTDOWN); + for (i = 1; i < mtu->num_eps; i++) { + nuke(mtu->in_eps + i, -ESHUTDOWN); + nuke(mtu->out_eps + i, -ESHUTDOWN); + } + + if (driver) { + spin_unlock(&mtu->lock); + driver->disconnect(&mtu->g); + spin_lock(&mtu->lock); + } +} + +static int mtu3_gadget_stop(struct usb_gadget *g) +{ + struct mtu3 *mtu = gadget_to_mtu3(g); + unsigned long flags; + + dev_dbg(mtu->dev, "%s\n", __func__); + + spin_lock_irqsave(&mtu->lock, flags); + + stop_activity(mtu); + mtu->gadget_driver = NULL; + + if (mtu->ssusb->dr_mode == USB_DR_MODE_PERIPHERAL) + mtu3_stop(mtu); + + spin_unlock_irqrestore(&mtu->lock, flags); + + synchronize_irq(mtu->irq); + return 0; +} + +static void +mtu3_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed) +{ + struct mtu3 *mtu = gadget_to_mtu3(g); + unsigned long flags; + + dev_dbg(mtu->dev, "%s %s\n", __func__, usb_speed_string(speed)); + + spin_lock_irqsave(&mtu->lock, flags); + mtu->speed = speed; + spin_unlock_irqrestore(&mtu->lock, flags); +} + +static void mtu3_gadget_async_callbacks(struct usb_gadget *g, bool enable) +{ + struct mtu3 *mtu = gadget_to_mtu3(g); + unsigned long flags; + + dev_dbg(mtu->dev, "%s %s\n", __func__, enable ? "en" : "dis"); + + spin_lock_irqsave(&mtu->lock, flags); + mtu->async_callbacks = enable; + spin_unlock_irqrestore(&mtu->lock, flags); +} + +static const struct usb_gadget_ops mtu3_gadget_ops = { + .get_frame = mtu3_gadget_get_frame, + .wakeup = mtu3_gadget_wakeup, + .set_selfpowered = mtu3_gadget_set_self_powered, + .pullup = mtu3_gadget_pullup, + .udc_start = mtu3_gadget_start, + .udc_stop = mtu3_gadget_stop, + .udc_set_speed = mtu3_gadget_set_speed, + .udc_async_callbacks = mtu3_gadget_async_callbacks, +}; + +static void mtu3_state_reset(struct mtu3 *mtu) +{ + mtu->address = 0; + mtu->ep0_state = MU3D_EP0_STATE_SETUP; + mtu->may_wakeup = 0; + mtu->u1_enable = 0; + mtu->u2_enable = 0; + mtu->delayed_status = false; + mtu->test_mode = false; +} + +static void init_hw_ep(struct mtu3 *mtu, struct mtu3_ep *mep, + u32 epnum, u32 is_in) +{ + mep->epnum = epnum; + mep->mtu = mtu; + mep->is_in = is_in; + + INIT_LIST_HEAD(&mep->req_list); + + sprintf(mep->name, "ep%d%s", epnum, + !epnum ? "" : (is_in ? "in" : "out")); + + mep->ep.name = mep->name; + INIT_LIST_HEAD(&mep->ep.ep_list); + + /* initialize maxpacket as SS */ + if (!epnum) { + usb_ep_set_maxpacket_limit(&mep->ep, 512); + mep->ep.caps.type_control = true; + mep->ep.ops = &mtu3_ep0_ops; + mtu->g.ep0 = &mep->ep; + } else { + usb_ep_set_maxpacket_limit(&mep->ep, 1024); + mep->ep.caps.type_iso = true; + mep->ep.caps.type_bulk = true; + mep->ep.caps.type_int = true; + mep->ep.ops = &mtu3_ep_ops; + list_add_tail(&mep->ep.ep_list, &mtu->g.ep_list); + } + + dev_dbg(mtu->dev, "%s, name=%s, maxp=%d\n", __func__, mep->ep.name, + mep->ep.maxpacket); + + if (!epnum) { + mep->ep.caps.dir_in = true; + mep->ep.caps.dir_out = true; + } else if (is_in) { + mep->ep.caps.dir_in = true; + } else { + mep->ep.caps.dir_out = true; + } +} + +static void mtu3_gadget_init_eps(struct mtu3 *mtu) +{ + u8 epnum; + + /* initialize endpoint list just once */ + INIT_LIST_HEAD(&(mtu->g.ep_list)); + + dev_dbg(mtu->dev, "%s num_eps(1 for a pair of tx&rx ep)=%d\n", + __func__, mtu->num_eps); + + init_hw_ep(mtu, mtu->ep0, 0, 0); + for (epnum = 1; epnum < mtu->num_eps; epnum++) { + init_hw_ep(mtu, mtu->in_eps + epnum, epnum, 1); + init_hw_ep(mtu, mtu->out_eps + epnum, epnum, 0); + } +} + +int mtu3_gadget_setup(struct mtu3 *mtu) +{ + mtu->g.ops = &mtu3_gadget_ops; + mtu->g.max_speed = mtu->max_speed; + mtu->g.speed = USB_SPEED_UNKNOWN; + mtu->g.sg_supported = 0; + mtu->g.name = MTU3_DRIVER_NAME; + mtu->g.irq = mtu->irq; + mtu->is_active = 0; + mtu->delayed_status = false; + + mtu3_gadget_init_eps(mtu); + + return usb_add_gadget_udc(mtu->dev, &mtu->g); +} + +void mtu3_gadget_cleanup(struct mtu3 *mtu) +{ + usb_del_gadget_udc(&mtu->g); +} + +void mtu3_gadget_resume(struct mtu3 *mtu) +{ + dev_dbg(mtu->dev, "gadget RESUME\n"); + if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->resume) { + spin_unlock(&mtu->lock); + mtu->gadget_driver->resume(&mtu->g); + spin_lock(&mtu->lock); + } +} + +/* called when SOF packets stop for 3+ msec or enters U3 */ +void mtu3_gadget_suspend(struct mtu3 *mtu) +{ + dev_dbg(mtu->dev, "gadget SUSPEND\n"); + if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->suspend) { + spin_unlock(&mtu->lock); + mtu->gadget_driver->suspend(&mtu->g); + spin_lock(&mtu->lock); + } +} + +/* called when VBUS drops below session threshold, and in other cases */ +void mtu3_gadget_disconnect(struct mtu3 *mtu) +{ + dev_dbg(mtu->dev, "gadget DISCONNECT\n"); + if (mtu->async_callbacks && mtu->gadget_driver && mtu->gadget_driver->disconnect) { + spin_unlock(&mtu->lock); + mtu->gadget_driver->disconnect(&mtu->g); + spin_lock(&mtu->lock); + } + + mtu3_state_reset(mtu); + usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED); +} + +void mtu3_gadget_reset(struct mtu3 *mtu) +{ + dev_dbg(mtu->dev, "gadget RESET\n"); + + /* report disconnect, if we didn't flush EP state */ + if (mtu->g.speed != USB_SPEED_UNKNOWN) + mtu3_gadget_disconnect(mtu); + else + mtu3_state_reset(mtu); +} -- cgit v1.2.3