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path: root/drivers/usb/gadget/g_ffs.c
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Diffstat (limited to 'drivers/usb/gadget/g_ffs.c')
-rw-r--r--drivers/usb/gadget/g_ffs.c200
1 files changed, 176 insertions, 24 deletions
diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c
index a85eaf40b948..d3ace9002a6a 100644
--- a/drivers/usb/gadget/g_ffs.c
+++ b/drivers/usb/gadget/g_ffs.c
@@ -67,6 +67,15 @@ MODULE_LICENSE("GPL");
#define GFS_VENDOR_ID 0x1d6b /* Linux Foundation */
#define GFS_PRODUCT_ID 0x0105 /* FunctionFS Gadget */
+#define GFS_MAX_DEVS 10
+
+struct gfs_ffs_obj {
+ const char *name;
+ bool mounted;
+ bool desc_ready;
+ struct ffs_data *ffs_data;
+};
+
static struct usb_device_descriptor gfs_dev_desc = {
.bLength = sizeof gfs_dev_desc,
.bDescriptorType = USB_DT_DEVICE,
@@ -78,12 +87,17 @@ static struct usb_device_descriptor gfs_dev_desc = {
.idProduct = cpu_to_le16(GFS_PRODUCT_ID),
};
+static char *func_names[GFS_MAX_DEVS];
+static unsigned int func_num;
+
module_param_named(bDeviceClass, gfs_dev_desc.bDeviceClass, byte, 0644);
MODULE_PARM_DESC(bDeviceClass, "USB Device class");
module_param_named(bDeviceSubClass, gfs_dev_desc.bDeviceSubClass, byte, 0644);
MODULE_PARM_DESC(bDeviceSubClass, "USB Device subclass");
module_param_named(bDeviceProtocol, gfs_dev_desc.bDeviceProtocol, byte, 0644);
MODULE_PARM_DESC(bDeviceProtocol, "USB Device protocol");
+module_param_array_named(functions, func_names, charp, &func_num, 0);
+MODULE_PARM_DESC(functions, "USB Functions list");
static const struct usb_descriptor_header *gfs_otg_desc[] = {
(const struct usb_descriptor_header *)
@@ -158,13 +172,34 @@ static struct usb_composite_driver gfs_driver = {
.iProduct = DRIVER_DESC,
};
-static struct ffs_data *gfs_ffs_data;
-static unsigned long gfs_registered;
+static DEFINE_MUTEX(gfs_lock);
+static unsigned int missing_funcs;
+static bool gfs_ether_setup;
+static bool gfs_registered;
+static bool gfs_single_func;
+static struct gfs_ffs_obj *ffs_tab;
static int __init gfs_init(void)
{
+ int i;
+
ENTER();
+ if (!func_num) {
+ gfs_single_func = true;
+ func_num = 1;
+ }
+
+ ffs_tab = kcalloc(func_num, sizeof *ffs_tab, GFP_KERNEL);
+ if (!ffs_tab)
+ return -ENOMEM;
+
+ if (!gfs_single_func)
+ for (i = 0; i < func_num; i++)
+ ffs_tab[i].name = func_names[i];
+
+ missing_funcs = func_num;
+
return functionfs_init();
}
module_init(gfs_init);
@@ -172,63 +207,165 @@ module_init(gfs_init);
static void __exit gfs_exit(void)
{
ENTER();
+ mutex_lock(&gfs_lock);
- if (test_and_clear_bit(0, &gfs_registered))
+ if (gfs_registered)
usb_composite_unregister(&gfs_driver);
+ gfs_registered = false;
functionfs_cleanup();
+
+ mutex_unlock(&gfs_lock);
+ kfree(ffs_tab);
}
module_exit(gfs_exit);
+static struct gfs_ffs_obj *gfs_find_dev(const char *dev_name)
+{
+ int i;
+
+ ENTER();
+
+ if (gfs_single_func)
+ return &ffs_tab[0];
+
+ for (i = 0; i < func_num; i++)
+ if (strcmp(ffs_tab[i].name, dev_name) == 0)
+ return &ffs_tab[i];
+
+ return NULL;
+}
+
static int functionfs_ready_callback(struct ffs_data *ffs)
{
+ struct gfs_ffs_obj *ffs_obj;
int ret;
ENTER();
+ mutex_lock(&gfs_lock);
+
+ ffs_obj = ffs->private_data;
+ if (!ffs_obj) {
+ ret = -EINVAL;
+ goto done;
+ }
+
+ if (WARN_ON(ffs_obj->desc_ready)) {
+ ret = -EBUSY;
+ goto done;
+ }
+ ffs_obj->desc_ready = true;
+ ffs_obj->ffs_data = ffs;
- if (WARN_ON(test_and_set_bit(0, &gfs_registered)))
- return -EBUSY;
+ if (--missing_funcs) {
+ ret = 0;
+ goto done;
+ }
+
+ if (gfs_registered) {
+ ret = -EBUSY;
+ goto done;
+ }
+ gfs_registered = true;
- gfs_ffs_data = ffs;
ret = usb_composite_probe(&gfs_driver, gfs_bind);
if (unlikely(ret < 0))
- clear_bit(0, &gfs_registered);
+ gfs_registered = false;
+
+done:
+ mutex_unlock(&gfs_lock);
return ret;
}
static void functionfs_closed_callback(struct ffs_data *ffs)
{
+ struct gfs_ffs_obj *ffs_obj;
+
ENTER();
+ mutex_lock(&gfs_lock);
- if (test_and_clear_bit(0, &gfs_registered))
+ ffs_obj = ffs->private_data;
+ if (!ffs_obj)
+ goto done;
+
+ ffs_obj->desc_ready = false;
+ missing_funcs++;
+
+ if (gfs_registered)
usb_composite_unregister(&gfs_driver);
+ gfs_registered = false;
+
+done:
+ mutex_unlock(&gfs_lock);
}
-static int functionfs_check_dev_callback(const char *dev_name)
+static void *functionfs_acquire_dev_callback(const char *dev_name)
{
- return 0;
+ struct gfs_ffs_obj *ffs_dev;
+
+ ENTER();
+ mutex_lock(&gfs_lock);
+
+ ffs_dev = gfs_find_dev(dev_name);
+ if (!ffs_dev) {
+ ffs_dev = ERR_PTR(-ENODEV);
+ goto done;
+ }
+
+ if (ffs_dev->mounted) {
+ ffs_dev = ERR_PTR(-EBUSY);
+ goto done;
+ }
+ ffs_dev->mounted = true;
+
+done:
+ mutex_unlock(&gfs_lock);
+ return ffs_dev;
}
+static void functionfs_release_dev_callback(struct ffs_data *ffs_data)
+{
+ struct gfs_ffs_obj *ffs_dev;
+
+ ENTER();
+ mutex_lock(&gfs_lock);
+
+ ffs_dev = ffs_data->private_data;
+ if (ffs_dev)
+ ffs_dev->mounted = false;
+
+ mutex_unlock(&gfs_lock);
+}
+
+/*
+ * It is assumed that gfs_bind is called from a context where gfs_lock is held
+ */
static int gfs_bind(struct usb_composite_dev *cdev)
{
int ret, i;
ENTER();
- if (WARN_ON(!gfs_ffs_data))
+ if (missing_funcs)
return -ENODEV;
ret = gether_setup(cdev->gadget, gfs_hostaddr);
if (unlikely(ret < 0))
goto error_quick;
+ gfs_ether_setup = true;
ret = usb_string_ids_tab(cdev, gfs_strings);
if (unlikely(ret < 0))
goto error;
- ret = functionfs_bind(gfs_ffs_data, cdev);
- if (unlikely(ret < 0))
- goto error;
+ for (i = func_num; --i; ) {
+ ret = functionfs_bind(ffs_tab[i].ffs_data, cdev);
+ if (unlikely(ret < 0)) {
+ while (++i < func_num)
+ functionfs_unbind(ffs_tab[i].ffs_data);
+ goto error;
+ }
+ }
for (i = 0; i < ARRAY_SIZE(gfs_configurations); ++i) {
struct gfs_configuration *c = gfs_configurations + i;
@@ -246,16 +383,22 @@ static int gfs_bind(struct usb_composite_dev *cdev)
return 0;
error_unbind:
- functionfs_unbind(gfs_ffs_data);
+ for (i = 0; i < func_num; i++)
+ functionfs_unbind(ffs_tab[i].ffs_data);
error:
gether_cleanup();
error_quick:
- gfs_ffs_data = NULL;
+ gfs_ether_setup = false;
return ret;
}
+/*
+ * It is assumed that gfs_unbind is called from a context where gfs_lock is held
+ */
static int gfs_unbind(struct usb_composite_dev *cdev)
{
+ int i;
+
ENTER();
/*
@@ -266,22 +409,29 @@ static int gfs_unbind(struct usb_composite_dev *cdev)
* from composite on orror recovery, but what you're gonna
* do...?
*/
- if (gfs_ffs_data) {
+ if (gfs_ether_setup)
gether_cleanup();
- functionfs_unbind(gfs_ffs_data);
- gfs_ffs_data = NULL;
- }
+ gfs_ether_setup = false;
+
+ for (i = func_num; --i; )
+ if (ffs_tab[i].ffs_data)
+ functionfs_unbind(ffs_tab[i].ffs_data);
return 0;
}
+/*
+ * It is assumed that gfs_do_config is called from a context where
+ * gfs_lock is held
+ */
static int gfs_do_config(struct usb_configuration *c)
{
struct gfs_configuration *gc =
container_of(c, struct gfs_configuration, c);
+ int i;
int ret;
- if (WARN_ON(!gfs_ffs_data))
+ if (missing_funcs)
return -ENODEV;
if (gadget_is_otg(c->cdev->gadget)) {
@@ -295,9 +445,11 @@ static int gfs_do_config(struct usb_configuration *c)
return ret;
}
- ret = functionfs_bind_config(c->cdev, c, gfs_ffs_data);
- if (unlikely(ret < 0))
- return ret;
+ for (i = 0; i < func_num; i++) {
+ ret = functionfs_bind_config(c->cdev, c, ffs_tab[i].ffs_data);
+ if (unlikely(ret < 0))
+ return ret;
+ }
/*
* After previous do_configs there may be some invalid
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 11:06:20 +0000