diff options
Diffstat (limited to 'drivers/usb/gadget/g_ffs.c')
| -rw-r--r-- | drivers/usb/gadget/g_ffs.c | 200 |
1 files changed, 176 insertions, 24 deletions
diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c index a85eaf40b94..d3ace9002a6 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 |