diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/Makefile | 2 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/f_tcm.c | 286 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/tcm.h | 2 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/u_tcm.h | 50 | ||||
| -rw-r--r-- | drivers/usb/gadget/legacy/tcm_usb_gadget.c | 1 |
6 files changed, 339 insertions, 5 deletions
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig index 33834aa..5bf50db 100644 --- a/drivers/usb/gadget/Kconfig +++ b/drivers/usb/gadget/Kconfig @@ -199,6 +199,9 @@ config USB_F_HID config USB_F_PRINTER tristate +config USB_F_TCM + tristate + choice tristate "USB Gadget Drivers" default USB_ETH diff --git a/drivers/usb/gadget/function/Makefile b/drivers/usb/gadget/function/Makefile index bd7def5..cb8c225 100644 --- a/drivers/usb/gadget/function/Makefile +++ b/drivers/usb/gadget/function/Makefile @@ -44,3 +44,5 @@ usb_f_hid-y := f_hid.o obj-$(CONFIG_USB_F_HID) += usb_f_hid.o usb_f_printer-y := f_printer.o obj-$(CONFIG_USB_F_PRINTER) += usb_f_printer.o +usb_f_tcm-y := f_tcm.o +obj-$(CONFIG_USB_F_TCM) += usb_f_tcm.o diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c index ce246bc..3b1ba89 100644 --- a/drivers/usb/gadget/function/f_tcm.c +++ b/drivers/usb/gadget/function/f_tcm.c @@ -22,6 +22,21 @@ #include <asm/unaligned.h> #include "tcm.h" +#include "u_tcm.h" + +#ifndef USBF_TCM_INCLUDED + +#define TPG_INSTANCES 1 + +struct tpg_instance { + struct usb_function_instance *func_inst; + struct usbg_tpg *tpg; +}; + +static struct tpg_instance tpg_instances[TPG_INSTANCES]; + +static DEFINE_MUTEX(tpg_instances_lock); +#endif static inline struct f_uas *to_f_uas(struct usb_function *f) { @@ -1371,6 +1386,10 @@ static struct se_portal_group *usbg_make_tpg( struct usbg_tpg *tpg; unsigned long tpgt; int ret; +#ifndef USBF_TCM_INCLUDED + struct f_tcm_opts *opts; + unsigned i; +#endif if (strstr(name, "tpgt_") != name) return ERR_PTR(-EINVAL); @@ -1381,14 +1400,40 @@ static struct se_portal_group *usbg_make_tpg( pr_err("gadgets, you can't do this here.\n"); return ERR_PTR(-EBUSY); } +#ifndef USBF_TCM_INCLUDED + ret = -ENODEV; + mutex_lock(&tpg_instances_lock); + for (i = 0; i < TPG_INSTANCES; ++i) + if (tpg_instances[i].func_inst && !tpg_instances[i].tpg) + break; + if (i == TPG_INSTANCES) + goto unlock_inst; + + opts = container_of(tpg_instances[i].func_inst, struct f_tcm_opts, + func_inst); + mutex_lock(&opts->dep_lock); + if (!opts->ready) + goto unlock_dep; + + if (opts->has_dep && !try_module_get(opts->dependent)) + goto unlock_dep; +#endif tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL); + ret = -ENOMEM; if (!tpg) +#ifdef USBF_TCM_INCLUDED return ERR_PTR(-ENOMEM); +#else + goto unref_dep; +#endif mutex_init(&tpg->tpg_mutex); atomic_set(&tpg->tpg_port_count, 0); tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1); if (!tpg->workqueue) { +#ifndef USBF_TCM_INCLUDED + goto free_tpg; +#endif kfree(tpg); return NULL; } @@ -1402,12 +1447,35 @@ static struct se_portal_group *usbg_make_tpg( */ ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SAS); if (ret < 0) { +#ifndef USBF_TCM_INCLUDED + goto free_workqueue; +#endif destroy_workqueue(tpg->workqueue); kfree(tpg); return NULL; } +#ifndef USBF_TCM_INCLUDED + tpg_instances[i].tpg = tpg; + tpg->fi = tpg_instances[i].func_inst; + mutex_unlock(&opts->dep_lock); + mutex_unlock(&tpg_instances_lock); +#endif the_only_tpg_I_currently_have = tpg; return &tpg->se_tpg; +#ifndef USBF_TCM_INCLUDED +free_workqueue: + destroy_workqueue(tpg->workqueue); +free_tpg: + kfree(tpg); +unref_dep: + module_put(opts->dependent); +unlock_dep: + mutex_unlock(&opts->dep_lock); +unlock_inst: + mutex_unlock(&tpg_instances_lock); + + return ERR_PTR(ret); +#endif } static int tcm_usbg_drop_nexus(struct usbg_tpg *); @@ -1416,10 +1484,29 @@ static void usbg_drop_tpg(struct se_portal_group *se_tpg) { struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg); +#ifndef USBF_TCM_INCLUDED + unsigned i; + struct f_tcm_opts *opts; +#endif tcm_usbg_drop_nexus(tpg); core_tpg_deregister(se_tpg); destroy_workqueue(tpg->workqueue); + +#ifndef USBF_TCM_INCLUDED + mutex_lock(&tpg_instances_lock); + for (i = 0; i < TPG_INSTANCES; ++i) + if (tpg_instances[i].tpg == tpg) + break; + if (i < TPG_INSTANCES) + tpg_instances[i].tpg = NULL; + opts = container_of(tpg_instances[i].func_inst, + struct f_tcm_opts, func_inst); + mutex_lock(&opts->dep_lock); + module_put(opts->dependent); + mutex_unlock(&opts->dep_lock); + mutex_unlock(&tpg_instances_lock); +#endif kfree(tpg); the_only_tpg_I_currently_have = NULL; } @@ -1440,6 +1527,7 @@ static struct se_wwn *usbg_make_tport( tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL); if (!(tport)) return ERR_PTR(-ENOMEM); + tport->tport_wwpn = wwpn; snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name); return &tport->tport_wwn; @@ -1978,9 +2066,32 @@ static int tcm_bind(struct usb_configuration *c, struct usb_function *f) struct f_uas *fu = to_f_uas(f); struct usb_gadget *gadget = c->cdev->gadget; struct usb_ep *ep; +#ifndef USBF_TCM_INCLUDED + struct f_tcm_opts *opts; +#endif int iface; int ret; +#ifndef USBF_TCM_INCLUDED + opts = container_of(f->fi, struct f_tcm_opts, func_inst); + + mutex_lock(&opts->dep_lock); + if (!opts->can_attach) { + mutex_unlock(&opts->dep_lock); + return -ENODEV; + } + mutex_unlock(&opts->dep_lock); +#endif + if (tcm_us_strings[0].id == 0) { + ret = usb_string_ids_tab(c->cdev, tcm_us_strings); + if (ret < 0) + return ret; + + bot_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_BBB].id; + uasp_intf_desc.iInterface = + tcm_us_strings[USB_G_STR_INT_UAS].id; + } + iface = usb_interface_id(c, f); if (iface < 0) return iface; @@ -2038,7 +2149,9 @@ ep_fail: return -ENOTSUPP; } -static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) +#ifdef USBF_TCM_INCLUDED + +static void tcm_old_unbind(struct usb_configuration *c, struct usb_function *f) { struct f_uas *fu = to_f_uas(f); @@ -2046,6 +2159,8 @@ static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) kfree(fu); } +#endif + struct guas_setup_wq { struct work_struct work; struct f_uas *fu; @@ -2114,6 +2229,8 @@ static int tcm_setup(struct usb_function *f, return usbg_bot_setup(f, ctrl); } +#ifdef USBF_TCM_INCLUDED + static int tcm_bind_config(struct usb_configuration *c) { struct f_uas *fu; @@ -2124,16 +2241,13 @@ static int tcm_bind_config(struct usb_configuration *c) return -ENOMEM; fu->function.name = "Target Function"; fu->function.bind = tcm_bind; - fu->function.unbind = tcm_unbind; + fu->function.unbind = tcm_old_unbind; fu->function.set_alt = tcm_set_alt; fu->function.setup = tcm_setup; fu->function.disable = tcm_disable; fu->function.strings = tcm_strings; fu->tpg = the_only_tpg_I_currently_have; - bot_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_BBB].id; - uasp_intf_desc.iInterface = tcm_us_strings[USB_G_STR_INT_UAS].id; - ret = usb_add_function(c, &fu->function); if (ret) goto err; @@ -2143,3 +2257,165 @@ err: kfree(fu); return ret; } + +#else + +static void tcm_free_inst(struct usb_function_instance *f) +{ + struct f_tcm_opts *opts; + unsigned i; + + opts = container_of(f, struct f_tcm_opts, func_inst); + + mutex_lock(&tpg_instances_lock); + for (i = 0; i < TPG_INSTANCES; ++i) + if (tpg_instances[i].func_inst == f) + break; + if (i < TPG_INSTANCES) + tpg_instances[i].func_inst = NULL; + mutex_unlock(&tpg_instances_lock); + + kfree(opts); +} + +static int usbg_attach(struct usbg_tpg *tpg) +{ + struct usb_function_instance *f = tpg->fi; + struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); + + if (opts->tcm_register_callback) + return opts->tcm_register_callback(f); + + return 0; +} + +static void usbg_detach(struct usbg_tpg *tpg) +{ + struct usb_function_instance *f = tpg->fi; + struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); + + if (opts->tcm_unregister_callback) + opts->tcm_unregister_callback(f); +} + +static int tcm_set_name(struct usb_function_instance *f, const char *name) +{ + struct f_tcm_opts *opts = container_of(f, struct f_tcm_opts, func_inst); + + pr_debug("tcm: Activating %s\n", name); + + mutex_lock(&opts->dep_lock); + opts->ready = true; + mutex_unlock(&opts->dep_lock); + + return 0; +} + +static struct usb_function_instance *tcm_alloc_inst(void) +{ + struct f_tcm_opts *opts; + int i; + + + opts = kzalloc(sizeof(*opts), GFP_KERNEL); + if (!opts) + return ERR_PTR(-ENOMEM); + + mutex_lock(&tpg_instances_lock); + for (i = 0; i < TPG_INSTANCES; ++i) + if (!tpg_instances[i].func_inst) + break; + + if (i == TPG_INSTANCES) { + mutex_unlock(&tpg_instances_lock); + kfree(opts); + return ERR_PTR(-EBUSY); + } + tpg_instances[i].func_inst = &opts->func_inst; + mutex_unlock(&tpg_instances_lock); + + mutex_init(&opts->dep_lock); + opts->func_inst.set_inst_name = tcm_set_name; + opts->func_inst.free_func_inst = tcm_free_inst; + + return &opts->func_inst; +} + +static void tcm_free(struct usb_function *f) +{ + struct f_uas *tcm = to_f_uas(f); + + kfree(tcm); +} + +static void tcm_unbind(struct usb_configuration *c, struct usb_function *f) +{ + usb_free_all_descriptors(f); +} + +static struct usb_function *tcm_alloc(struct usb_function_instance *fi) +{ + struct f_uas *fu; + struct f_tcm_opts *opts; + unsigned i; + + mutex_lock(&tpg_instances_lock); + for (i = 0; i < TPG_INSTANCES; ++i) + if (tpg_instances[i].func_inst == fi) + break; + if (i == TPG_INSTANCES) { + mutex_unlock(&tpg_instances_lock); + return ERR_PTR(-ENODEV); + } + + opts = container_of(fi, struct f_tcm_opts, func_inst); + + fu = kzalloc(sizeof(*fu), GFP_KERNEL); + if (!fu) { + mutex_unlock(&tpg_instances_lock); + return ERR_PTR(-ENOMEM); + } + + fu->function.name = "Target Function"; + fu->function.bind = tcm_bind; + fu->function.unbind = tcm_unbind; + fu->function.set_alt = tcm_set_alt; + fu->function.setup = tcm_setup; + fu->function.disable = tcm_disable; + fu->function.strings = tcm_strings; + fu->function.free_func = tcm_free; + fu->tpg = tpg_instances[i].tpg; + mutex_unlock(&tpg_instances_lock); + + return &fu->function; +} + +DECLARE_USB_FUNCTION(tcm, tcm_alloc_inst, tcm_alloc); + +static int tcm_init(void) +{ + int ret; + + ret = usb_function_register(&tcmusb_func); + if (ret) + return ret; + + ret = target_register_template(&usbg_ops); + if (ret) + usb_function_unregister(&tcmusb_func); + + return ret; +} +module_init(tcm_init); + +static void tcm_exit(void) +{ + target_unregister_template(&usbg_ops); + usb_function_unregister(&tcmusb_func); +} +module_exit(tcm_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Sebastian Andrzej Siewior"); + +#endif diff --git a/drivers/usb/gadget/function/tcm.h b/drivers/usb/gadget/function/tcm.h index c2c3a0f..0b8ff6d 100644 --- a/drivers/usb/gadget/function/tcm.h +++ b/drivers/usb/gadget/function/tcm.h @@ -39,6 +39,8 @@ struct usbg_tpg { u32 gadget_connect; struct tcm_usbg_nexus *tpg_nexus; atomic_t tpg_port_count; + + struct usb_function_instance *fi; }; struct usbg_tport { diff --git a/drivers/usb/gadget/function/u_tcm.h b/drivers/usb/gadget/function/u_tcm.h new file mode 100644 index 0000000..0bd751e --- /dev/null +++ b/drivers/usb/gadget/function/u_tcm.h @@ -0,0 +1,50 @@ +/* + * u_tcm.h + * + * Utility definitions for the tcm function + * + * Copyright (c) 2015 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Author: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef U_TCM_H +#define U_TCM_H + +#include <linux/usb/composite.h> + +/** + * @dependent: optional dependent module. Meant for legacy gadget. + * If non-null its refcount will be increased when a tpg is created and + * decreased when tpg is dropped. + * @dep_lock: lock for dependent module operations. + * @ready: true if the dependent module information is set. + * @can_attach: true a function can be bound to gadget + * @has_dep: true if there is a dependent module + * + */ +struct f_tcm_opts { + struct usb_function_instance func_inst; + struct module *dependent; + struct mutex dep_lock; + bool ready; + bool can_attach; + bool has_dep; + + /* + * Callbacks to be removed when legacy tcm gadget disappears. + * + * If you use the new function registration interface + * programmatically, you MUST set these callbacks to + * something sensible (e.g. probe/remove the composite). + */ + int (*tcm_register_callback)(struct usb_function_instance *); + void (*tcm_unregister_callback)(struct usb_function_instance *); +}; + +#endif /* U_TCM_H */ diff --git a/drivers/usb/gadget/legacy/tcm_usb_gadget.c b/drivers/usb/gadget/legacy/tcm_usb_gadget.c index e6c601a..f042df4 100644 --- a/drivers/usb/gadget/legacy/tcm_usb_gadget.c +++ b/drivers/usb/gadget/legacy/tcm_usb_gadget.c @@ -24,6 +24,7 @@ USB_GADGET_COMPOSITE_OPTIONS(); /* #include to be removed when new function registration interface is used */ +#define USBF_TCM_INCLUDED #include "../function/f_tcm.c" #define UAS_VENDOR_ID 0x0525 /* NetChip */ |