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path: root/drivers/usb/gadget
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Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/function/f_fs.c2
-rw-r--r--drivers/usb/gadget/function/u_ether.c3
-rw-r--r--drivers/usb/gadget/udc/amd5536udc_pci.c3
-rw-r--r--drivers/usb/gadget/udc/core.c71
-rw-r--r--drivers/usb/gadget/udc/renesas_usb3.c4
5 files changed, 54 insertions, 29 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index a13c946e0663..f41a385a5c42 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -3535,6 +3535,7 @@ static void ffs_func_unbind(struct usb_configuration *c,
/* Drain any pending AIO completions */
drain_workqueue(ffs->io_completion_wq);
+ ffs_event_add(ffs, FUNCTIONFS_UNBIND);
if (!--opts->refcnt)
functionfs_unbind(ffs);
@@ -3559,7 +3560,6 @@ static void ffs_func_unbind(struct usb_configuration *c,
func->function.ssp_descriptors = NULL;
func->interfaces_nums = NULL;
- ffs_event_add(ffs, FUNCTIONFS_UNBIND);
}
static struct usb_function *ffs_alloc(struct usb_function_instance *fi)
diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 6956ad8ba8dd..a366abb45623 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -17,6 +17,7 @@
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
+#include <linux/string_helpers.h>
#include <linux/usb/composite.h>
#include "u_ether.h"
@@ -965,6 +966,8 @@ int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len)
dev = netdev_priv(net);
snprintf(host_addr, len, "%pm", dev->host_mac);
+ string_upper(host_addr, host_addr);
+
return strlen(host_addr);
}
EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc);
diff --git a/drivers/usb/gadget/udc/amd5536udc_pci.c b/drivers/usb/gadget/udc/amd5536udc_pci.c
index c80f9bd51b75..a36913ae31f9 100644
--- a/drivers/usb/gadget/udc/amd5536udc_pci.c
+++ b/drivers/usb/gadget/udc/amd5536udc_pci.c
@@ -170,6 +170,9 @@ static int udc_pci_probe(
retval = -ENODEV;
goto err_probe;
}
+
+ udc = dev;
+
return 0;
err_probe:
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 4641153e9706..83fd1de14784 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -37,10 +37,14 @@ static const struct bus_type gadget_bus_type;
* @vbus: for udcs who care about vbus status, this value is real vbus status;
* for udcs who do not care about vbus status, this value is always true
* @started: the UDC's started state. True if the UDC had started.
- * @connect_lock: protects udc->vbus, udc->started, gadget->connect, gadget->deactivate related
- * functions. usb_gadget_connect_locked, usb_gadget_disconnect_locked,
- * usb_udc_connect_control_locked, usb_gadget_udc_start_locked, usb_gadget_udc_stop_locked are
- * called with this lock held.
+ * @allow_connect: Indicates whether UDC is allowed to be pulled up.
+ * Set/cleared by gadget_(un)bind_driver() after gadget driver is bound or
+ * unbound.
+ * @connect_lock: protects udc->started, gadget->connect,
+ * gadget->allow_connect and gadget->deactivate. The routines
+ * usb_gadget_connect_locked(), usb_gadget_disconnect_locked(),
+ * usb_udc_connect_control_locked(), usb_gadget_udc_start_locked() and
+ * usb_gadget_udc_stop_locked() are called with this lock held.
*
* This represents the internal data structure which is used by the UDC-class
* to hold information about udc driver and gadget together.
@@ -52,6 +56,8 @@ struct usb_udc {
struct list_head list;
bool vbus;
bool started;
+ bool allow_connect;
+ struct work_struct vbus_work;
struct mutex connect_lock;
};
@@ -692,7 +698,6 @@ out:
}
EXPORT_SYMBOL_GPL(usb_gadget_vbus_disconnect);
-/* Internal version of usb_gadget_connect needs to be called with connect_lock held. */
static int usb_gadget_connect_locked(struct usb_gadget *gadget)
__must_hold(&gadget->udc->connect_lock)
{
@@ -703,15 +708,12 @@ static int usb_gadget_connect_locked(struct usb_gadget *gadget)
goto out;
}
- if (gadget->connected)
- goto out;
-
- if (gadget->deactivated || !gadget->udc->started) {
+ if (gadget->deactivated || !gadget->udc->allow_connect || !gadget->udc->started) {
/*
- * If gadget is deactivated we only save new state.
- * Gadget will be connected automatically after activation.
- *
- * udc first needs to be started before gadget can be pulled up.
+ * If the gadget isn't usable (because it is deactivated,
+ * unbound, or not yet started), we only save the new state.
+ * The gadget will be connected automatically when it is
+ * activated/bound/started.
*/
gadget->connected = true;
goto out;
@@ -749,7 +751,6 @@ int usb_gadget_connect(struct usb_gadget *gadget)
}
EXPORT_SYMBOL_GPL(usb_gadget_connect);
-/* Internal version of usb_gadget_disconnect needs to be called with connect_lock held. */
static int usb_gadget_disconnect_locked(struct usb_gadget *gadget)
__must_hold(&gadget->udc->connect_lock)
{
@@ -767,8 +768,6 @@ static int usb_gadget_disconnect_locked(struct usb_gadget *gadget)
/*
* If gadget is deactivated we only save new state.
* Gadget will stay disconnected after activation.
- *
- * udc should have been started before gadget being pulled down.
*/
gadget->connected = false;
goto out;
@@ -829,10 +828,10 @@ int usb_gadget_deactivate(struct usb_gadget *gadget)
{
int ret = 0;
+ mutex_lock(&gadget->udc->connect_lock);
if (gadget->deactivated)
- goto out;
+ goto unlock;
- mutex_lock(&gadget->udc->connect_lock);
if (gadget->connected) {
ret = usb_gadget_disconnect_locked(gadget);
if (ret)
@@ -848,7 +847,6 @@ int usb_gadget_deactivate(struct usb_gadget *gadget)
unlock:
mutex_unlock(&gadget->udc->connect_lock);
-out:
trace_usb_gadget_deactivate(gadget, ret);
return ret;
@@ -868,10 +866,10 @@ int usb_gadget_activate(struct usb_gadget *gadget)
{
int ret = 0;
+ mutex_lock(&gadget->udc->connect_lock);
if (!gadget->deactivated)
- goto out;
+ goto unlock;
- mutex_lock(&gadget->udc->connect_lock);
gadget->deactivated = false;
/*
@@ -882,7 +880,8 @@ int usb_gadget_activate(struct usb_gadget *gadget)
ret = usb_gadget_connect_locked(gadget);
mutex_unlock(&gadget->udc->connect_lock);
-out:
+unlock:
+ mutex_unlock(&gadget->udc->connect_lock);
trace_usb_gadget_activate(gadget, ret);
return ret;
@@ -1124,12 +1123,21 @@ EXPORT_SYMBOL_GPL(usb_gadget_set_state);
/* Acquire connect_lock before calling this function. */
static void usb_udc_connect_control_locked(struct usb_udc *udc) __must_hold(&udc->connect_lock)
{
- if (udc->vbus && udc->started)
+ if (udc->vbus)
usb_gadget_connect_locked(udc->gadget);
else
usb_gadget_disconnect_locked(udc->gadget);
}
+static void vbus_event_work(struct work_struct *work)
+{
+ struct usb_udc *udc = container_of(work, struct usb_udc, vbus_work);
+
+ mutex_lock(&udc->connect_lock);
+ usb_udc_connect_control_locked(udc);
+ mutex_unlock(&udc->connect_lock);
+}
+
/**
* usb_udc_vbus_handler - updates the udc core vbus status, and try to
* connect or disconnect gadget
@@ -1138,17 +1146,23 @@ static void usb_udc_connect_control_locked(struct usb_udc *udc) __must_hold(&udc
*
* The udc driver calls it when it wants to connect or disconnect gadget
* according to vbus status.
+ *
+ * This function can be invoked from interrupt context by irq handlers of
+ * the gadget drivers, however, usb_udc_connect_control() has to run in
+ * non-atomic context due to the following:
+ * a. Some of the gadget driver implementations expect the ->pullup
+ * callback to be invoked in non-atomic context.
+ * b. usb_gadget_disconnect() acquires udc_lock which is a mutex.
+ * Hence offload invocation of usb_udc_connect_control() to workqueue.
*/
void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status)
{
struct usb_udc *udc = gadget->udc;
- mutex_lock(&udc->connect_lock);
if (udc) {
udc->vbus = status;
- usb_udc_connect_control_locked(udc);
+ schedule_work(&udc->vbus_work);
}
- mutex_unlock(&udc->connect_lock);
}
EXPORT_SYMBOL_GPL(usb_udc_vbus_handler);
@@ -1381,6 +1395,7 @@ int usb_add_gadget(struct usb_gadget *gadget)
mutex_lock(&udc_lock);
list_add_tail(&udc->list, &udc_list);
mutex_unlock(&udc_lock);
+ INIT_WORK(&udc->vbus_work, vbus_event_work);
ret = device_add(&udc->dev);
if (ret)
@@ -1512,6 +1527,7 @@ void usb_del_gadget(struct usb_gadget *gadget)
flush_work(&gadget->work);
device_del(&gadget->dev);
ida_free(&gadget_id_numbers, gadget->id_number);
+ cancel_work_sync(&udc->vbus_work);
device_unregister(&udc->dev);
}
EXPORT_SYMBOL_GPL(usb_del_gadget);
@@ -1583,6 +1599,7 @@ static int gadget_bind_driver(struct device *dev)
goto err_start;
}
usb_gadget_enable_async_callbacks(udc);
+ udc->allow_connect = true;
usb_udc_connect_control_locked(udc);
mutex_unlock(&udc->connect_lock);
@@ -1615,6 +1632,8 @@ static void gadget_unbind_driver(struct device *dev)
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
+ udc->allow_connect = false;
+ cancel_work_sync(&udc->vbus_work);
mutex_lock(&udc->connect_lock);
usb_gadget_disconnect_locked(gadget);
usb_gadget_disable_async_callbacks(udc);
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index aac8bc185afa..eb008e873361 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2877,9 +2877,9 @@ static int renesas_usb3_probe(struct platform_device *pdev)
struct rzv2m_usb3drd *ddata = dev_get_drvdata(pdev->dev.parent);
usb3->drd_reg = ddata->reg;
- ret = devm_request_irq(ddata->dev, ddata->drd_irq,
+ ret = devm_request_irq(&pdev->dev, ddata->drd_irq,
renesas_usb3_otg_irq, 0,
- dev_name(ddata->dev), usb3);
+ dev_name(&pdev->dev), usb3);
if (ret < 0)
return ret;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-30 07:09:08 +0300