diff options
Diffstat (limited to 'drivers/usb/gadget/composite.c')
| -rw-r--r-- | drivers/usb/gadget/composite.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 8a1c3752f75f..9d7a1fabc482 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -28,6 +28,12 @@ * with the relevant device-wide data. */ +static struct usb_gadget_strings **get_containers_gs( + struct usb_gadget_string_container *uc) +{ + return (struct usb_gadget_strings **)uc->stash; +} + /** * next_ep_desc() - advance to the next EP descriptor * @t: currect pointer within descriptor array @@ -904,6 +910,7 @@ static int get_string(struct usb_composite_dev *cdev, void *buf, u16 language, int id) { struct usb_composite_driver *composite = cdev->driver; + struct usb_gadget_string_container *uc; struct usb_configuration *c; struct usb_function *f; int len; @@ -946,6 +953,15 @@ static int get_string(struct usb_composite_dev *cdev, return s->bLength; } + list_for_each_entry(uc, &cdev->gstrings, list) { + struct usb_gadget_strings **sp; + + sp = get_containers_gs(uc); + len = lookup_string(sp, buf, language, id); + if (len > 0) + return len; + } + /* String IDs are device-scoped, so we look up each string * table we're told about. These lookups are infrequent; * simpler-is-better here. @@ -1031,6 +1047,119 @@ int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str) } EXPORT_SYMBOL_GPL(usb_string_ids_tab); +static struct usb_gadget_string_container *copy_gadget_strings( + struct usb_gadget_strings **sp, unsigned n_gstrings, + unsigned n_strings) +{ + struct usb_gadget_string_container *uc; + struct usb_gadget_strings **gs_array; + struct usb_gadget_strings *gs; + struct usb_string *s; + unsigned mem; + unsigned n_gs; + unsigned n_s; + void *stash; + + mem = sizeof(*uc); + mem += sizeof(void *) * (n_gstrings + 1); + mem += sizeof(struct usb_gadget_strings) * n_gstrings; + mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings); + uc = kmalloc(mem, GFP_KERNEL); + if (!uc) + return ERR_PTR(-ENOMEM); + gs_array = get_containers_gs(uc); + stash = uc->stash; + stash += sizeof(void *) * (n_gstrings + 1); + for (n_gs = 0; n_gs < n_gstrings; n_gs++) { + struct usb_string *org_s; + + gs_array[n_gs] = stash; + gs = gs_array[n_gs]; + stash += sizeof(struct usb_gadget_strings); + gs->language = sp[n_gs]->language; + gs->strings = stash; + org_s = sp[n_gs]->strings; + + for (n_s = 0; n_s < n_strings; n_s++) { + s = stash; + stash += sizeof(struct usb_string); + if (org_s->s) + s->s = org_s->s; + else + s->s = ""; + org_s++; + } + s = stash; + s->s = NULL; + stash += sizeof(struct usb_string); + + } + gs_array[n_gs] = NULL; + return uc; +} + +/** + * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids + * @cdev: the device whose string descriptor IDs are being allocated + * and attached. + * @sp: an array of usb_gadget_strings to attach. + * @n_strings: number of entries in each usb_strings array (sp[]->strings) + * + * This function will create a deep copy of usb_gadget_strings and usb_string + * and attach it to the cdev. The actual string (usb_string.s) will not be + * copied but only a referenced will be made. The struct usb_gadget_strings + * array may contain multiple languges and should be NULL terminated. + * The ->language pointer of each struct usb_gadget_strings has to contain the + * same amount of entries. + * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first + * usb_string entry of es-ES containts the translation of the first usb_string + * entry of en-US. Therefore both entries become the same id assign. + */ +struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev, + struct usb_gadget_strings **sp, unsigned n_strings) +{ + struct usb_gadget_string_container *uc; + struct usb_gadget_strings **n_gs; + unsigned n_gstrings = 0; + unsigned i; + int ret; + + for (i = 0; sp[i]; i++) + n_gstrings++; + + if (!n_gstrings) + return ERR_PTR(-EINVAL); + + uc = copy_gadget_strings(sp, n_gstrings, n_strings); + if (IS_ERR(uc)) + return ERR_PTR(PTR_ERR(uc)); + + n_gs = get_containers_gs(uc); + ret = usb_string_ids_tab(cdev, n_gs[0]->strings); + if (ret) + goto err; + + for (i = 1; i < n_gstrings; i++) { + struct usb_string *m_s; + struct usb_string *s; + unsigned n; + + m_s = n_gs[0]->strings; + s = n_gs[i]->strings; + for (n = 0; n < n_strings; n++) { + s->id = m_s->id; + s++; + m_s++; + } + } + list_add_tail(&uc->list, &cdev->gstrings); + return n_gs[0]->strings; +err: + kfree(uc); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(usb_gstrings_attach); + /** * usb_string_ids_n() - allocate unused string IDs in batch * @c: the device whose string descriptor IDs are being allocated @@ -1377,6 +1506,7 @@ static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL); static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver) { struct usb_composite_dev *cdev = get_gadget_data(gadget); + struct usb_gadget_string_container *uc, *tmp; /* composite_disconnect() must already have been called * by the underlying peripheral controller driver! @@ -1391,6 +1521,10 @@ static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver) struct usb_configuration, list); remove_config(cdev, c); } + list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) { + list_del(&uc->list); + kfree(uc); + } if (cdev->driver->unbind && unbind_driver) cdev->driver->unbind(cdev); @@ -1514,6 +1648,7 @@ static int composite_bind(struct usb_gadget *gadget, cdev->gadget = gadget; set_gadget_data(gadget, cdev); INIT_LIST_HEAD(&cdev->configs); + INIT_LIST_HEAD(&cdev->gstrings); status = composite_dev_prepare(composite, cdev); if (status) |