100a2430fSAndrzej Pietrasiewicz /* 200a2430fSAndrzej Pietrasiewicz * f_fs.c -- user mode file system API for USB composite function controllers 300a2430fSAndrzej Pietrasiewicz * 400a2430fSAndrzej Pietrasiewicz * Copyright (C) 2010 Samsung Electronics 500a2430fSAndrzej Pietrasiewicz * Author: Michal Nazarewicz <mina86@mina86.com> 600a2430fSAndrzej Pietrasiewicz * 700a2430fSAndrzej Pietrasiewicz * Based on inode.c (GadgetFS) which was: 800a2430fSAndrzej Pietrasiewicz * Copyright (C) 2003-2004 David Brownell 900a2430fSAndrzej Pietrasiewicz * Copyright (C) 2003 Agilent Technologies 1000a2430fSAndrzej Pietrasiewicz * 1100a2430fSAndrzej Pietrasiewicz * This program is free software; you can redistribute it and/or modify 1200a2430fSAndrzej Pietrasiewicz * it under the terms of the GNU General Public License as published by 1300a2430fSAndrzej Pietrasiewicz * the Free Software Foundation; either version 2 of the License, or 1400a2430fSAndrzej Pietrasiewicz * (at your option) any later version. 1500a2430fSAndrzej Pietrasiewicz */ 1600a2430fSAndrzej Pietrasiewicz 1700a2430fSAndrzej Pietrasiewicz 1800a2430fSAndrzej Pietrasiewicz /* #define DEBUG */ 1900a2430fSAndrzej Pietrasiewicz /* #define VERBOSE_DEBUG */ 2000a2430fSAndrzej Pietrasiewicz 2100a2430fSAndrzej Pietrasiewicz #include <linux/blkdev.h> 2200a2430fSAndrzej Pietrasiewicz #include <linux/pagemap.h> 2300a2430fSAndrzej Pietrasiewicz #include <linux/export.h> 2400a2430fSAndrzej Pietrasiewicz #include <linux/hid.h> 2500a2430fSAndrzej Pietrasiewicz #include <linux/module.h> 26e2e40f2cSChristoph Hellwig #include <linux/uio.h> 2700a2430fSAndrzej Pietrasiewicz #include <asm/unaligned.h> 2800a2430fSAndrzej Pietrasiewicz 2900a2430fSAndrzej Pietrasiewicz #include <linux/usb/composite.h> 3000a2430fSAndrzej Pietrasiewicz #include <linux/usb/functionfs.h> 3100a2430fSAndrzej Pietrasiewicz 3200a2430fSAndrzej Pietrasiewicz #include <linux/aio.h> 3300a2430fSAndrzej Pietrasiewicz #include <linux/mmu_context.h> 3400a2430fSAndrzej Pietrasiewicz #include <linux/poll.h> 355e33f6fdSRobert Baldyga #include <linux/eventfd.h> 3600a2430fSAndrzej Pietrasiewicz 3700a2430fSAndrzej Pietrasiewicz #include "u_fs.h" 3800a2430fSAndrzej Pietrasiewicz #include "u_f.h" 3900a2430fSAndrzej Pietrasiewicz #include "u_os_desc.h" 4000a2430fSAndrzej Pietrasiewicz #include "configfs.h" 4100a2430fSAndrzej Pietrasiewicz 4200a2430fSAndrzej Pietrasiewicz #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ 4300a2430fSAndrzej Pietrasiewicz 4400a2430fSAndrzej Pietrasiewicz /* Reference counter handling */ 4500a2430fSAndrzej Pietrasiewicz static void ffs_data_get(struct ffs_data *ffs); 4600a2430fSAndrzej Pietrasiewicz static void ffs_data_put(struct ffs_data *ffs); 4700a2430fSAndrzej Pietrasiewicz /* Creates new ffs_data object. */ 4800a2430fSAndrzej Pietrasiewicz static struct ffs_data *__must_check ffs_data_new(void) __attribute__((malloc)); 4900a2430fSAndrzej Pietrasiewicz 5000a2430fSAndrzej Pietrasiewicz /* Opened counter handling. */ 5100a2430fSAndrzej Pietrasiewicz static void ffs_data_opened(struct ffs_data *ffs); 5200a2430fSAndrzej Pietrasiewicz static void ffs_data_closed(struct ffs_data *ffs); 5300a2430fSAndrzej Pietrasiewicz 5400a2430fSAndrzej Pietrasiewicz /* Called with ffs->mutex held; take over ownership of data. */ 5500a2430fSAndrzej Pietrasiewicz static int __must_check 5600a2430fSAndrzej Pietrasiewicz __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); 5700a2430fSAndrzej Pietrasiewicz static int __must_check 5800a2430fSAndrzej Pietrasiewicz __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); 5900a2430fSAndrzej Pietrasiewicz 6000a2430fSAndrzej Pietrasiewicz 6100a2430fSAndrzej Pietrasiewicz /* The function structure ***************************************************/ 6200a2430fSAndrzej Pietrasiewicz 6300a2430fSAndrzej Pietrasiewicz struct ffs_ep; 6400a2430fSAndrzej Pietrasiewicz 6500a2430fSAndrzej Pietrasiewicz struct ffs_function { 6600a2430fSAndrzej Pietrasiewicz struct usb_configuration *conf; 6700a2430fSAndrzej Pietrasiewicz struct usb_gadget *gadget; 6800a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs; 6900a2430fSAndrzej Pietrasiewicz 7000a2430fSAndrzej Pietrasiewicz struct ffs_ep *eps; 7100a2430fSAndrzej Pietrasiewicz u8 eps_revmap[16]; 7200a2430fSAndrzej Pietrasiewicz short *interfaces_nums; 7300a2430fSAndrzej Pietrasiewicz 7400a2430fSAndrzej Pietrasiewicz struct usb_function function; 7500a2430fSAndrzej Pietrasiewicz }; 7600a2430fSAndrzej Pietrasiewicz 7700a2430fSAndrzej Pietrasiewicz 7800a2430fSAndrzej Pietrasiewicz static struct ffs_function *ffs_func_from_usb(struct usb_function *f) 7900a2430fSAndrzej Pietrasiewicz { 8000a2430fSAndrzej Pietrasiewicz return container_of(f, struct ffs_function, function); 8100a2430fSAndrzej Pietrasiewicz } 8200a2430fSAndrzej Pietrasiewicz 8300a2430fSAndrzej Pietrasiewicz 8400a2430fSAndrzej Pietrasiewicz static inline enum ffs_setup_state 8500a2430fSAndrzej Pietrasiewicz ffs_setup_state_clear_cancelled(struct ffs_data *ffs) 8600a2430fSAndrzej Pietrasiewicz { 8700a2430fSAndrzej Pietrasiewicz return (enum ffs_setup_state) 8800a2430fSAndrzej Pietrasiewicz cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); 8900a2430fSAndrzej Pietrasiewicz } 9000a2430fSAndrzej Pietrasiewicz 9100a2430fSAndrzej Pietrasiewicz 9200a2430fSAndrzej Pietrasiewicz static void ffs_func_eps_disable(struct ffs_function *func); 9300a2430fSAndrzej Pietrasiewicz static int __must_check ffs_func_eps_enable(struct ffs_function *func); 9400a2430fSAndrzej Pietrasiewicz 9500a2430fSAndrzej Pietrasiewicz static int ffs_func_bind(struct usb_configuration *, 9600a2430fSAndrzej Pietrasiewicz struct usb_function *); 9700a2430fSAndrzej Pietrasiewicz static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); 9800a2430fSAndrzej Pietrasiewicz static void ffs_func_disable(struct usb_function *); 9900a2430fSAndrzej Pietrasiewicz static int ffs_func_setup(struct usb_function *, 10000a2430fSAndrzej Pietrasiewicz const struct usb_ctrlrequest *); 10100a2430fSAndrzej Pietrasiewicz static void ffs_func_suspend(struct usb_function *); 10200a2430fSAndrzej Pietrasiewicz static void ffs_func_resume(struct usb_function *); 10300a2430fSAndrzej Pietrasiewicz 10400a2430fSAndrzej Pietrasiewicz 10500a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); 10600a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); 10700a2430fSAndrzej Pietrasiewicz 10800a2430fSAndrzej Pietrasiewicz 10900a2430fSAndrzej Pietrasiewicz /* The endpoints structures *************************************************/ 11000a2430fSAndrzej Pietrasiewicz 11100a2430fSAndrzej Pietrasiewicz struct ffs_ep { 11200a2430fSAndrzej Pietrasiewicz struct usb_ep *ep; /* P: ffs->eps_lock */ 11300a2430fSAndrzej Pietrasiewicz struct usb_request *req; /* P: epfile->mutex */ 11400a2430fSAndrzej Pietrasiewicz 11500a2430fSAndrzej Pietrasiewicz /* [0]: full speed, [1]: high speed, [2]: super speed */ 11600a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *descs[3]; 11700a2430fSAndrzej Pietrasiewicz 11800a2430fSAndrzej Pietrasiewicz u8 num; 11900a2430fSAndrzej Pietrasiewicz 12000a2430fSAndrzej Pietrasiewicz int status; /* P: epfile->mutex */ 12100a2430fSAndrzej Pietrasiewicz }; 12200a2430fSAndrzej Pietrasiewicz 12300a2430fSAndrzej Pietrasiewicz struct ffs_epfile { 12400a2430fSAndrzej Pietrasiewicz /* Protects ep->ep and ep->req. */ 12500a2430fSAndrzej Pietrasiewicz struct mutex mutex; 12600a2430fSAndrzej Pietrasiewicz wait_queue_head_t wait; 12700a2430fSAndrzej Pietrasiewicz 12800a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs; 12900a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep; /* P: ffs->eps_lock */ 13000a2430fSAndrzej Pietrasiewicz 13100a2430fSAndrzej Pietrasiewicz struct dentry *dentry; 13200a2430fSAndrzej Pietrasiewicz 1339353afbbSMichal Nazarewicz /* 1349353afbbSMichal Nazarewicz * Buffer for holding data from partial reads which may happen since 1359353afbbSMichal Nazarewicz * we’re rounding user read requests to a multiple of a max packet size. 1369353afbbSMichal Nazarewicz */ 1379353afbbSMichal Nazarewicz struct ffs_buffer *read_buffer; /* P: epfile->mutex */ 1389353afbbSMichal Nazarewicz 13900a2430fSAndrzej Pietrasiewicz char name[5]; 14000a2430fSAndrzej Pietrasiewicz 14100a2430fSAndrzej Pietrasiewicz unsigned char in; /* P: ffs->eps_lock */ 14200a2430fSAndrzej Pietrasiewicz unsigned char isoc; /* P: ffs->eps_lock */ 14300a2430fSAndrzej Pietrasiewicz 14400a2430fSAndrzej Pietrasiewicz unsigned char _pad; 14500a2430fSAndrzej Pietrasiewicz }; 14600a2430fSAndrzej Pietrasiewicz 1479353afbbSMichal Nazarewicz struct ffs_buffer { 1489353afbbSMichal Nazarewicz size_t length; 1499353afbbSMichal Nazarewicz char *data; 1509353afbbSMichal Nazarewicz char storage[]; 1519353afbbSMichal Nazarewicz }; 1529353afbbSMichal Nazarewicz 15300a2430fSAndrzej Pietrasiewicz /* ffs_io_data structure ***************************************************/ 15400a2430fSAndrzej Pietrasiewicz 15500a2430fSAndrzej Pietrasiewicz struct ffs_io_data { 15600a2430fSAndrzej Pietrasiewicz bool aio; 15700a2430fSAndrzej Pietrasiewicz bool read; 15800a2430fSAndrzej Pietrasiewicz 15900a2430fSAndrzej Pietrasiewicz struct kiocb *kiocb; 160c993c39bSAl Viro struct iov_iter data; 161c993c39bSAl Viro const void *to_free; 162c993c39bSAl Viro char *buf; 16300a2430fSAndrzej Pietrasiewicz 16400a2430fSAndrzej Pietrasiewicz struct mm_struct *mm; 16500a2430fSAndrzej Pietrasiewicz struct work_struct work; 16600a2430fSAndrzej Pietrasiewicz 16700a2430fSAndrzej Pietrasiewicz struct usb_ep *ep; 16800a2430fSAndrzej Pietrasiewicz struct usb_request *req; 1695e33f6fdSRobert Baldyga 1705e33f6fdSRobert Baldyga struct ffs_data *ffs; 17100a2430fSAndrzej Pietrasiewicz }; 17200a2430fSAndrzej Pietrasiewicz 1736d5c1c77SRobert Baldyga struct ffs_desc_helper { 1746d5c1c77SRobert Baldyga struct ffs_data *ffs; 1756d5c1c77SRobert Baldyga unsigned interfaces_count; 1766d5c1c77SRobert Baldyga unsigned eps_count; 1776d5c1c77SRobert Baldyga }; 1786d5c1c77SRobert Baldyga 17900a2430fSAndrzej Pietrasiewicz static int __must_check ffs_epfiles_create(struct ffs_data *ffs); 18000a2430fSAndrzej Pietrasiewicz static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); 18100a2430fSAndrzej Pietrasiewicz 1821bb27cacSAl Viro static struct dentry * 18300a2430fSAndrzej Pietrasiewicz ffs_sb_create_file(struct super_block *sb, const char *name, void *data, 1841bb27cacSAl Viro const struct file_operations *fops); 18500a2430fSAndrzej Pietrasiewicz 18600a2430fSAndrzej Pietrasiewicz /* Devices management *******************************************************/ 18700a2430fSAndrzej Pietrasiewicz 18800a2430fSAndrzej Pietrasiewicz DEFINE_MUTEX(ffs_lock); 18900a2430fSAndrzej Pietrasiewicz EXPORT_SYMBOL_GPL(ffs_lock); 19000a2430fSAndrzej Pietrasiewicz 19100a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_find_dev(const char *name); 19200a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_alloc_dev(void); 19300a2430fSAndrzej Pietrasiewicz static int _ffs_name_dev(struct ffs_dev *dev, const char *name); 19400a2430fSAndrzej Pietrasiewicz static void _ffs_free_dev(struct ffs_dev *dev); 19500a2430fSAndrzej Pietrasiewicz static void *ffs_acquire_dev(const char *dev_name); 19600a2430fSAndrzej Pietrasiewicz static void ffs_release_dev(struct ffs_data *ffs_data); 19700a2430fSAndrzej Pietrasiewicz static int ffs_ready(struct ffs_data *ffs); 19800a2430fSAndrzej Pietrasiewicz static void ffs_closed(struct ffs_data *ffs); 19900a2430fSAndrzej Pietrasiewicz 20000a2430fSAndrzej Pietrasiewicz /* Misc helper functions ****************************************************/ 20100a2430fSAndrzej Pietrasiewicz 20200a2430fSAndrzej Pietrasiewicz static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) 20300a2430fSAndrzej Pietrasiewicz __attribute__((warn_unused_result, nonnull)); 20400a2430fSAndrzej Pietrasiewicz static char *ffs_prepare_buffer(const char __user *buf, size_t len) 20500a2430fSAndrzej Pietrasiewicz __attribute__((warn_unused_result, nonnull)); 20600a2430fSAndrzej Pietrasiewicz 20700a2430fSAndrzej Pietrasiewicz 20800a2430fSAndrzej Pietrasiewicz /* Control file aka ep0 *****************************************************/ 20900a2430fSAndrzej Pietrasiewicz 21000a2430fSAndrzej Pietrasiewicz static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) 21100a2430fSAndrzej Pietrasiewicz { 21200a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = req->context; 21300a2430fSAndrzej Pietrasiewicz 21400a2430fSAndrzej Pietrasiewicz complete_all(&ffs->ep0req_completion); 21500a2430fSAndrzej Pietrasiewicz } 21600a2430fSAndrzej Pietrasiewicz 21700a2430fSAndrzej Pietrasiewicz static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) 21800a2430fSAndrzej Pietrasiewicz { 21900a2430fSAndrzej Pietrasiewicz struct usb_request *req = ffs->ep0req; 22000a2430fSAndrzej Pietrasiewicz int ret; 22100a2430fSAndrzej Pietrasiewicz 22200a2430fSAndrzej Pietrasiewicz req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); 22300a2430fSAndrzej Pietrasiewicz 22400a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 22500a2430fSAndrzej Pietrasiewicz 22600a2430fSAndrzej Pietrasiewicz req->buf = data; 22700a2430fSAndrzej Pietrasiewicz req->length = len; 22800a2430fSAndrzej Pietrasiewicz 22900a2430fSAndrzej Pietrasiewicz /* 23000a2430fSAndrzej Pietrasiewicz * UDC layer requires to provide a buffer even for ZLP, but should 23100a2430fSAndrzej Pietrasiewicz * not use it at all. Let's provide some poisoned pointer to catch 23200a2430fSAndrzej Pietrasiewicz * possible bug in the driver. 23300a2430fSAndrzej Pietrasiewicz */ 23400a2430fSAndrzej Pietrasiewicz if (req->buf == NULL) 23500a2430fSAndrzej Pietrasiewicz req->buf = (void *)0xDEADBABE; 23600a2430fSAndrzej Pietrasiewicz 23700a2430fSAndrzej Pietrasiewicz reinit_completion(&ffs->ep0req_completion); 23800a2430fSAndrzej Pietrasiewicz 23900a2430fSAndrzej Pietrasiewicz ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); 24000a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 24100a2430fSAndrzej Pietrasiewicz return ret; 24200a2430fSAndrzej Pietrasiewicz 24300a2430fSAndrzej Pietrasiewicz ret = wait_for_completion_interruptible(&ffs->ep0req_completion); 24400a2430fSAndrzej Pietrasiewicz if (unlikely(ret)) { 24500a2430fSAndrzej Pietrasiewicz usb_ep_dequeue(ffs->gadget->ep0, req); 24600a2430fSAndrzej Pietrasiewicz return -EINTR; 24700a2430fSAndrzej Pietrasiewicz } 24800a2430fSAndrzej Pietrasiewicz 24900a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_NO_SETUP; 25000a2430fSAndrzej Pietrasiewicz return req->status ? req->status : req->actual; 25100a2430fSAndrzej Pietrasiewicz } 25200a2430fSAndrzej Pietrasiewicz 25300a2430fSAndrzej Pietrasiewicz static int __ffs_ep0_stall(struct ffs_data *ffs) 25400a2430fSAndrzej Pietrasiewicz { 25500a2430fSAndrzej Pietrasiewicz if (ffs->ev.can_stall) { 25600a2430fSAndrzej Pietrasiewicz pr_vdebug("ep0 stall\n"); 25700a2430fSAndrzej Pietrasiewicz usb_ep_set_halt(ffs->gadget->ep0); 25800a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_NO_SETUP; 25900a2430fSAndrzej Pietrasiewicz return -EL2HLT; 26000a2430fSAndrzej Pietrasiewicz } else { 26100a2430fSAndrzej Pietrasiewicz pr_debug("bogus ep0 stall!\n"); 26200a2430fSAndrzej Pietrasiewicz return -ESRCH; 26300a2430fSAndrzej Pietrasiewicz } 26400a2430fSAndrzej Pietrasiewicz } 26500a2430fSAndrzej Pietrasiewicz 26600a2430fSAndrzej Pietrasiewicz static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, 26700a2430fSAndrzej Pietrasiewicz size_t len, loff_t *ptr) 26800a2430fSAndrzej Pietrasiewicz { 26900a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 27000a2430fSAndrzej Pietrasiewicz ssize_t ret; 27100a2430fSAndrzej Pietrasiewicz char *data; 27200a2430fSAndrzej Pietrasiewicz 27300a2430fSAndrzej Pietrasiewicz ENTER(); 27400a2430fSAndrzej Pietrasiewicz 27500a2430fSAndrzej Pietrasiewicz /* Fast check if setup was canceled */ 27600a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) 27700a2430fSAndrzej Pietrasiewicz return -EIDRM; 27800a2430fSAndrzej Pietrasiewicz 27900a2430fSAndrzej Pietrasiewicz /* Acquire mutex */ 28000a2430fSAndrzej Pietrasiewicz ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); 28100a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 28200a2430fSAndrzej Pietrasiewicz return ret; 28300a2430fSAndrzej Pietrasiewicz 28400a2430fSAndrzej Pietrasiewicz /* Check state */ 28500a2430fSAndrzej Pietrasiewicz switch (ffs->state) { 28600a2430fSAndrzej Pietrasiewicz case FFS_READ_DESCRIPTORS: 28700a2430fSAndrzej Pietrasiewicz case FFS_READ_STRINGS: 28800a2430fSAndrzej Pietrasiewicz /* Copy data */ 28900a2430fSAndrzej Pietrasiewicz if (unlikely(len < 16)) { 29000a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 29100a2430fSAndrzej Pietrasiewicz break; 29200a2430fSAndrzej Pietrasiewicz } 29300a2430fSAndrzej Pietrasiewicz 29400a2430fSAndrzej Pietrasiewicz data = ffs_prepare_buffer(buf, len); 29500a2430fSAndrzej Pietrasiewicz if (IS_ERR(data)) { 29600a2430fSAndrzej Pietrasiewicz ret = PTR_ERR(data); 29700a2430fSAndrzej Pietrasiewicz break; 29800a2430fSAndrzej Pietrasiewicz } 29900a2430fSAndrzej Pietrasiewicz 30000a2430fSAndrzej Pietrasiewicz /* Handle data */ 30100a2430fSAndrzej Pietrasiewicz if (ffs->state == FFS_READ_DESCRIPTORS) { 30200a2430fSAndrzej Pietrasiewicz pr_info("read descriptors\n"); 30300a2430fSAndrzej Pietrasiewicz ret = __ffs_data_got_descs(ffs, data, len); 30400a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 30500a2430fSAndrzej Pietrasiewicz break; 30600a2430fSAndrzej Pietrasiewicz 30700a2430fSAndrzej Pietrasiewicz ffs->state = FFS_READ_STRINGS; 30800a2430fSAndrzej Pietrasiewicz ret = len; 30900a2430fSAndrzej Pietrasiewicz } else { 31000a2430fSAndrzej Pietrasiewicz pr_info("read strings\n"); 31100a2430fSAndrzej Pietrasiewicz ret = __ffs_data_got_strings(ffs, data, len); 31200a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 31300a2430fSAndrzej Pietrasiewicz break; 31400a2430fSAndrzej Pietrasiewicz 31500a2430fSAndrzej Pietrasiewicz ret = ffs_epfiles_create(ffs); 31600a2430fSAndrzej Pietrasiewicz if (unlikely(ret)) { 31700a2430fSAndrzej Pietrasiewicz ffs->state = FFS_CLOSING; 31800a2430fSAndrzej Pietrasiewicz break; 31900a2430fSAndrzej Pietrasiewicz } 32000a2430fSAndrzej Pietrasiewicz 32100a2430fSAndrzej Pietrasiewicz ffs->state = FFS_ACTIVE; 32200a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 32300a2430fSAndrzej Pietrasiewicz 32400a2430fSAndrzej Pietrasiewicz ret = ffs_ready(ffs); 32500a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 32600a2430fSAndrzej Pietrasiewicz ffs->state = FFS_CLOSING; 32700a2430fSAndrzej Pietrasiewicz return ret; 32800a2430fSAndrzej Pietrasiewicz } 32900a2430fSAndrzej Pietrasiewicz 33000a2430fSAndrzej Pietrasiewicz return len; 33100a2430fSAndrzej Pietrasiewicz } 33200a2430fSAndrzej Pietrasiewicz break; 33300a2430fSAndrzej Pietrasiewicz 33400a2430fSAndrzej Pietrasiewicz case FFS_ACTIVE: 33500a2430fSAndrzej Pietrasiewicz data = NULL; 33600a2430fSAndrzej Pietrasiewicz /* 33700a2430fSAndrzej Pietrasiewicz * We're called from user space, we can use _irq 33800a2430fSAndrzej Pietrasiewicz * rather then _irqsave 33900a2430fSAndrzej Pietrasiewicz */ 34000a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 34100a2430fSAndrzej Pietrasiewicz switch (ffs_setup_state_clear_cancelled(ffs)) { 34200a2430fSAndrzej Pietrasiewicz case FFS_SETUP_CANCELLED: 34300a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 34400a2430fSAndrzej Pietrasiewicz goto done_spin; 34500a2430fSAndrzej Pietrasiewicz 34600a2430fSAndrzej Pietrasiewicz case FFS_NO_SETUP: 34700a2430fSAndrzej Pietrasiewicz ret = -ESRCH; 34800a2430fSAndrzej Pietrasiewicz goto done_spin; 34900a2430fSAndrzej Pietrasiewicz 35000a2430fSAndrzej Pietrasiewicz case FFS_SETUP_PENDING: 35100a2430fSAndrzej Pietrasiewicz break; 35200a2430fSAndrzej Pietrasiewicz } 35300a2430fSAndrzej Pietrasiewicz 35400a2430fSAndrzej Pietrasiewicz /* FFS_SETUP_PENDING */ 35500a2430fSAndrzej Pietrasiewicz if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { 35600a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 35700a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_stall(ffs); 35800a2430fSAndrzej Pietrasiewicz break; 35900a2430fSAndrzej Pietrasiewicz } 36000a2430fSAndrzej Pietrasiewicz 36100a2430fSAndrzej Pietrasiewicz /* FFS_SETUP_PENDING and not stall */ 36200a2430fSAndrzej Pietrasiewicz len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); 36300a2430fSAndrzej Pietrasiewicz 36400a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 36500a2430fSAndrzej Pietrasiewicz 36600a2430fSAndrzej Pietrasiewicz data = ffs_prepare_buffer(buf, len); 36700a2430fSAndrzej Pietrasiewicz if (IS_ERR(data)) { 36800a2430fSAndrzej Pietrasiewicz ret = PTR_ERR(data); 36900a2430fSAndrzej Pietrasiewicz break; 37000a2430fSAndrzej Pietrasiewicz } 37100a2430fSAndrzej Pietrasiewicz 37200a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 37300a2430fSAndrzej Pietrasiewicz 37400a2430fSAndrzej Pietrasiewicz /* 37500a2430fSAndrzej Pietrasiewicz * We are guaranteed to be still in FFS_ACTIVE state 37600a2430fSAndrzej Pietrasiewicz * but the state of setup could have changed from 37700a2430fSAndrzej Pietrasiewicz * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need 37800a2430fSAndrzej Pietrasiewicz * to check for that. If that happened we copied data 37900a2430fSAndrzej Pietrasiewicz * from user space in vain but it's unlikely. 38000a2430fSAndrzej Pietrasiewicz * 38100a2430fSAndrzej Pietrasiewicz * For sure we are not in FFS_NO_SETUP since this is 38200a2430fSAndrzej Pietrasiewicz * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP 38300a2430fSAndrzej Pietrasiewicz * transition can be performed and it's protected by 38400a2430fSAndrzej Pietrasiewicz * mutex. 38500a2430fSAndrzej Pietrasiewicz */ 38600a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == 38700a2430fSAndrzej Pietrasiewicz FFS_SETUP_CANCELLED) { 38800a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 38900a2430fSAndrzej Pietrasiewicz done_spin: 39000a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 39100a2430fSAndrzej Pietrasiewicz } else { 39200a2430fSAndrzej Pietrasiewicz /* unlocks spinlock */ 39300a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_queue_wait(ffs, data, len); 39400a2430fSAndrzej Pietrasiewicz } 39500a2430fSAndrzej Pietrasiewicz kfree(data); 39600a2430fSAndrzej Pietrasiewicz break; 39700a2430fSAndrzej Pietrasiewicz 39800a2430fSAndrzej Pietrasiewicz default: 39900a2430fSAndrzej Pietrasiewicz ret = -EBADFD; 40000a2430fSAndrzej Pietrasiewicz break; 40100a2430fSAndrzej Pietrasiewicz } 40200a2430fSAndrzej Pietrasiewicz 40300a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 40400a2430fSAndrzej Pietrasiewicz return ret; 40500a2430fSAndrzej Pietrasiewicz } 40600a2430fSAndrzej Pietrasiewicz 40767913bbdSMichal Nazarewicz /* Called with ffs->ev.waitq.lock and ffs->mutex held, both released on exit. */ 40800a2430fSAndrzej Pietrasiewicz static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, 40900a2430fSAndrzej Pietrasiewicz size_t n) 41000a2430fSAndrzej Pietrasiewicz { 41100a2430fSAndrzej Pietrasiewicz /* 41267913bbdSMichal Nazarewicz * n cannot be bigger than ffs->ev.count, which cannot be bigger than 41367913bbdSMichal Nazarewicz * size of ffs->ev.types array (which is four) so that's how much space 41467913bbdSMichal Nazarewicz * we reserve. 41500a2430fSAndrzej Pietrasiewicz */ 41667913bbdSMichal Nazarewicz struct usb_functionfs_event events[ARRAY_SIZE(ffs->ev.types)]; 41767913bbdSMichal Nazarewicz const size_t size = n * sizeof *events; 41800a2430fSAndrzej Pietrasiewicz unsigned i = 0; 41900a2430fSAndrzej Pietrasiewicz 42067913bbdSMichal Nazarewicz memset(events, 0, size); 42100a2430fSAndrzej Pietrasiewicz 42200a2430fSAndrzej Pietrasiewicz do { 42300a2430fSAndrzej Pietrasiewicz events[i].type = ffs->ev.types[i]; 42400a2430fSAndrzej Pietrasiewicz if (events[i].type == FUNCTIONFS_SETUP) { 42500a2430fSAndrzej Pietrasiewicz events[i].u.setup = ffs->ev.setup; 42600a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_SETUP_PENDING; 42700a2430fSAndrzej Pietrasiewicz } 42800a2430fSAndrzej Pietrasiewicz } while (++i < n); 42900a2430fSAndrzej Pietrasiewicz 43000a2430fSAndrzej Pietrasiewicz ffs->ev.count -= n; 43167913bbdSMichal Nazarewicz if (ffs->ev.count) 43200a2430fSAndrzej Pietrasiewicz memmove(ffs->ev.types, ffs->ev.types + n, 43300a2430fSAndrzej Pietrasiewicz ffs->ev.count * sizeof *ffs->ev.types); 43400a2430fSAndrzej Pietrasiewicz 43500a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 43600a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 43700a2430fSAndrzej Pietrasiewicz 4387fe9a937SDaniel Walter return unlikely(copy_to_user(buf, events, size)) ? -EFAULT : size; 43900a2430fSAndrzej Pietrasiewicz } 44000a2430fSAndrzej Pietrasiewicz 44100a2430fSAndrzej Pietrasiewicz static ssize_t ffs_ep0_read(struct file *file, char __user *buf, 44200a2430fSAndrzej Pietrasiewicz size_t len, loff_t *ptr) 44300a2430fSAndrzej Pietrasiewicz { 44400a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 44500a2430fSAndrzej Pietrasiewicz char *data = NULL; 44600a2430fSAndrzej Pietrasiewicz size_t n; 44700a2430fSAndrzej Pietrasiewicz int ret; 44800a2430fSAndrzej Pietrasiewicz 44900a2430fSAndrzej Pietrasiewicz ENTER(); 45000a2430fSAndrzej Pietrasiewicz 45100a2430fSAndrzej Pietrasiewicz /* Fast check if setup was canceled */ 45200a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) 45300a2430fSAndrzej Pietrasiewicz return -EIDRM; 45400a2430fSAndrzej Pietrasiewicz 45500a2430fSAndrzej Pietrasiewicz /* Acquire mutex */ 45600a2430fSAndrzej Pietrasiewicz ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); 45700a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 45800a2430fSAndrzej Pietrasiewicz return ret; 45900a2430fSAndrzej Pietrasiewicz 46000a2430fSAndrzej Pietrasiewicz /* Check state */ 46100a2430fSAndrzej Pietrasiewicz if (ffs->state != FFS_ACTIVE) { 46200a2430fSAndrzej Pietrasiewicz ret = -EBADFD; 46300a2430fSAndrzej Pietrasiewicz goto done_mutex; 46400a2430fSAndrzej Pietrasiewicz } 46500a2430fSAndrzej Pietrasiewicz 46600a2430fSAndrzej Pietrasiewicz /* 46700a2430fSAndrzej Pietrasiewicz * We're called from user space, we can use _irq rather then 46800a2430fSAndrzej Pietrasiewicz * _irqsave 46900a2430fSAndrzej Pietrasiewicz */ 47000a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 47100a2430fSAndrzej Pietrasiewicz 47200a2430fSAndrzej Pietrasiewicz switch (ffs_setup_state_clear_cancelled(ffs)) { 47300a2430fSAndrzej Pietrasiewicz case FFS_SETUP_CANCELLED: 47400a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 47500a2430fSAndrzej Pietrasiewicz break; 47600a2430fSAndrzej Pietrasiewicz 47700a2430fSAndrzej Pietrasiewicz case FFS_NO_SETUP: 47800a2430fSAndrzej Pietrasiewicz n = len / sizeof(struct usb_functionfs_event); 47900a2430fSAndrzej Pietrasiewicz if (unlikely(!n)) { 48000a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 48100a2430fSAndrzej Pietrasiewicz break; 48200a2430fSAndrzej Pietrasiewicz } 48300a2430fSAndrzej Pietrasiewicz 48400a2430fSAndrzej Pietrasiewicz if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { 48500a2430fSAndrzej Pietrasiewicz ret = -EAGAIN; 48600a2430fSAndrzej Pietrasiewicz break; 48700a2430fSAndrzej Pietrasiewicz } 48800a2430fSAndrzej Pietrasiewicz 48900a2430fSAndrzej Pietrasiewicz if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, 49000a2430fSAndrzej Pietrasiewicz ffs->ev.count)) { 49100a2430fSAndrzej Pietrasiewicz ret = -EINTR; 49200a2430fSAndrzej Pietrasiewicz break; 49300a2430fSAndrzej Pietrasiewicz } 49400a2430fSAndrzej Pietrasiewicz 49500a2430fSAndrzej Pietrasiewicz return __ffs_ep0_read_events(ffs, buf, 49600a2430fSAndrzej Pietrasiewicz min(n, (size_t)ffs->ev.count)); 49700a2430fSAndrzej Pietrasiewicz 49800a2430fSAndrzej Pietrasiewicz case FFS_SETUP_PENDING: 49900a2430fSAndrzej Pietrasiewicz if (ffs->ev.setup.bRequestType & USB_DIR_IN) { 50000a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 50100a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_stall(ffs); 50200a2430fSAndrzej Pietrasiewicz goto done_mutex; 50300a2430fSAndrzej Pietrasiewicz } 50400a2430fSAndrzej Pietrasiewicz 50500a2430fSAndrzej Pietrasiewicz len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); 50600a2430fSAndrzej Pietrasiewicz 50700a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 50800a2430fSAndrzej Pietrasiewicz 50900a2430fSAndrzej Pietrasiewicz if (likely(len)) { 51000a2430fSAndrzej Pietrasiewicz data = kmalloc(len, GFP_KERNEL); 51100a2430fSAndrzej Pietrasiewicz if (unlikely(!data)) { 51200a2430fSAndrzej Pietrasiewicz ret = -ENOMEM; 51300a2430fSAndrzej Pietrasiewicz goto done_mutex; 51400a2430fSAndrzej Pietrasiewicz } 51500a2430fSAndrzej Pietrasiewicz } 51600a2430fSAndrzej Pietrasiewicz 51700a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 51800a2430fSAndrzej Pietrasiewicz 51900a2430fSAndrzej Pietrasiewicz /* See ffs_ep0_write() */ 52000a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == 52100a2430fSAndrzej Pietrasiewicz FFS_SETUP_CANCELLED) { 52200a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 52300a2430fSAndrzej Pietrasiewicz break; 52400a2430fSAndrzej Pietrasiewicz } 52500a2430fSAndrzej Pietrasiewicz 52600a2430fSAndrzej Pietrasiewicz /* unlocks spinlock */ 52700a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_queue_wait(ffs, data, len); 5287fe9a937SDaniel Walter if (likely(ret > 0) && unlikely(copy_to_user(buf, data, len))) 52900a2430fSAndrzej Pietrasiewicz ret = -EFAULT; 53000a2430fSAndrzej Pietrasiewicz goto done_mutex; 53100a2430fSAndrzej Pietrasiewicz 53200a2430fSAndrzej Pietrasiewicz default: 53300a2430fSAndrzej Pietrasiewicz ret = -EBADFD; 53400a2430fSAndrzej Pietrasiewicz break; 53500a2430fSAndrzej Pietrasiewicz } 53600a2430fSAndrzej Pietrasiewicz 53700a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 53800a2430fSAndrzej Pietrasiewicz done_mutex: 53900a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 54000a2430fSAndrzej Pietrasiewicz kfree(data); 54100a2430fSAndrzej Pietrasiewicz return ret; 54200a2430fSAndrzej Pietrasiewicz } 54300a2430fSAndrzej Pietrasiewicz 54400a2430fSAndrzej Pietrasiewicz static int ffs_ep0_open(struct inode *inode, struct file *file) 54500a2430fSAndrzej Pietrasiewicz { 54600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = inode->i_private; 54700a2430fSAndrzej Pietrasiewicz 54800a2430fSAndrzej Pietrasiewicz ENTER(); 54900a2430fSAndrzej Pietrasiewicz 55000a2430fSAndrzej Pietrasiewicz if (unlikely(ffs->state == FFS_CLOSING)) 55100a2430fSAndrzej Pietrasiewicz return -EBUSY; 55200a2430fSAndrzej Pietrasiewicz 55300a2430fSAndrzej Pietrasiewicz file->private_data = ffs; 55400a2430fSAndrzej Pietrasiewicz ffs_data_opened(ffs); 55500a2430fSAndrzej Pietrasiewicz 55600a2430fSAndrzej Pietrasiewicz return 0; 55700a2430fSAndrzej Pietrasiewicz } 55800a2430fSAndrzej Pietrasiewicz 55900a2430fSAndrzej Pietrasiewicz static int ffs_ep0_release(struct inode *inode, struct file *file) 56000a2430fSAndrzej Pietrasiewicz { 56100a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 56200a2430fSAndrzej Pietrasiewicz 56300a2430fSAndrzej Pietrasiewicz ENTER(); 56400a2430fSAndrzej Pietrasiewicz 56500a2430fSAndrzej Pietrasiewicz ffs_data_closed(ffs); 56600a2430fSAndrzej Pietrasiewicz 56700a2430fSAndrzej Pietrasiewicz return 0; 56800a2430fSAndrzej Pietrasiewicz } 56900a2430fSAndrzej Pietrasiewicz 57000a2430fSAndrzej Pietrasiewicz static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) 57100a2430fSAndrzej Pietrasiewicz { 57200a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 57300a2430fSAndrzej Pietrasiewicz struct usb_gadget *gadget = ffs->gadget; 57400a2430fSAndrzej Pietrasiewicz long ret; 57500a2430fSAndrzej Pietrasiewicz 57600a2430fSAndrzej Pietrasiewicz ENTER(); 57700a2430fSAndrzej Pietrasiewicz 57800a2430fSAndrzej Pietrasiewicz if (code == FUNCTIONFS_INTERFACE_REVMAP) { 57900a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs->func; 58000a2430fSAndrzej Pietrasiewicz ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; 58100a2430fSAndrzej Pietrasiewicz } else if (gadget && gadget->ops->ioctl) { 58200a2430fSAndrzej Pietrasiewicz ret = gadget->ops->ioctl(gadget, code, value); 58300a2430fSAndrzej Pietrasiewicz } else { 58400a2430fSAndrzej Pietrasiewicz ret = -ENOTTY; 58500a2430fSAndrzej Pietrasiewicz } 58600a2430fSAndrzej Pietrasiewicz 58700a2430fSAndrzej Pietrasiewicz return ret; 58800a2430fSAndrzej Pietrasiewicz } 58900a2430fSAndrzej Pietrasiewicz 59000a2430fSAndrzej Pietrasiewicz static unsigned int ffs_ep0_poll(struct file *file, poll_table *wait) 59100a2430fSAndrzej Pietrasiewicz { 59200a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 59300a2430fSAndrzej Pietrasiewicz unsigned int mask = POLLWRNORM; 59400a2430fSAndrzej Pietrasiewicz int ret; 59500a2430fSAndrzej Pietrasiewicz 59600a2430fSAndrzej Pietrasiewicz poll_wait(file, &ffs->ev.waitq, wait); 59700a2430fSAndrzej Pietrasiewicz 59800a2430fSAndrzej Pietrasiewicz ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); 59900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 60000a2430fSAndrzej Pietrasiewicz return mask; 60100a2430fSAndrzej Pietrasiewicz 60200a2430fSAndrzej Pietrasiewicz switch (ffs->state) { 60300a2430fSAndrzej Pietrasiewicz case FFS_READ_DESCRIPTORS: 60400a2430fSAndrzej Pietrasiewicz case FFS_READ_STRINGS: 60500a2430fSAndrzej Pietrasiewicz mask |= POLLOUT; 60600a2430fSAndrzej Pietrasiewicz break; 60700a2430fSAndrzej Pietrasiewicz 60800a2430fSAndrzej Pietrasiewicz case FFS_ACTIVE: 60900a2430fSAndrzej Pietrasiewicz switch (ffs->setup_state) { 61000a2430fSAndrzej Pietrasiewicz case FFS_NO_SETUP: 61100a2430fSAndrzej Pietrasiewicz if (ffs->ev.count) 61200a2430fSAndrzej Pietrasiewicz mask |= POLLIN; 61300a2430fSAndrzej Pietrasiewicz break; 61400a2430fSAndrzej Pietrasiewicz 61500a2430fSAndrzej Pietrasiewicz case FFS_SETUP_PENDING: 61600a2430fSAndrzej Pietrasiewicz case FFS_SETUP_CANCELLED: 61700a2430fSAndrzej Pietrasiewicz mask |= (POLLIN | POLLOUT); 61800a2430fSAndrzej Pietrasiewicz break; 61900a2430fSAndrzej Pietrasiewicz } 62000a2430fSAndrzej Pietrasiewicz case FFS_CLOSING: 62100a2430fSAndrzej Pietrasiewicz break; 62218d6b32fSRobert Baldyga case FFS_DEACTIVATED: 62318d6b32fSRobert Baldyga break; 62400a2430fSAndrzej Pietrasiewicz } 62500a2430fSAndrzej Pietrasiewicz 62600a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 62700a2430fSAndrzej Pietrasiewicz 62800a2430fSAndrzej Pietrasiewicz return mask; 62900a2430fSAndrzej Pietrasiewicz } 63000a2430fSAndrzej Pietrasiewicz 63100a2430fSAndrzej Pietrasiewicz static const struct file_operations ffs_ep0_operations = { 63200a2430fSAndrzej Pietrasiewicz .llseek = no_llseek, 63300a2430fSAndrzej Pietrasiewicz 63400a2430fSAndrzej Pietrasiewicz .open = ffs_ep0_open, 63500a2430fSAndrzej Pietrasiewicz .write = ffs_ep0_write, 63600a2430fSAndrzej Pietrasiewicz .read = ffs_ep0_read, 63700a2430fSAndrzej Pietrasiewicz .release = ffs_ep0_release, 63800a2430fSAndrzej Pietrasiewicz .unlocked_ioctl = ffs_ep0_ioctl, 63900a2430fSAndrzej Pietrasiewicz .poll = ffs_ep0_poll, 64000a2430fSAndrzej Pietrasiewicz }; 64100a2430fSAndrzej Pietrasiewicz 64200a2430fSAndrzej Pietrasiewicz 64300a2430fSAndrzej Pietrasiewicz /* "Normal" endpoints operations ********************************************/ 64400a2430fSAndrzej Pietrasiewicz 64500a2430fSAndrzej Pietrasiewicz static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) 64600a2430fSAndrzej Pietrasiewicz { 64700a2430fSAndrzej Pietrasiewicz ENTER(); 64800a2430fSAndrzej Pietrasiewicz if (likely(req->context)) { 64900a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = _ep->driver_data; 65000a2430fSAndrzej Pietrasiewicz ep->status = req->status ? req->status : req->actual; 65100a2430fSAndrzej Pietrasiewicz complete(req->context); 65200a2430fSAndrzej Pietrasiewicz } 65300a2430fSAndrzej Pietrasiewicz } 65400a2430fSAndrzej Pietrasiewicz 655c662a31bSMichal Nazarewicz static ssize_t ffs_copy_to_iter(void *data, int data_len, struct iov_iter *iter) 656c662a31bSMichal Nazarewicz { 657c662a31bSMichal Nazarewicz ssize_t ret = copy_to_iter(data, data_len, iter); 658c662a31bSMichal Nazarewicz if (likely(ret == data_len)) 659c662a31bSMichal Nazarewicz return ret; 660c662a31bSMichal Nazarewicz 661c662a31bSMichal Nazarewicz if (unlikely(iov_iter_count(iter))) 662c662a31bSMichal Nazarewicz return -EFAULT; 663c662a31bSMichal Nazarewicz 664c662a31bSMichal Nazarewicz /* 665c662a31bSMichal Nazarewicz * Dear user space developer! 666c662a31bSMichal Nazarewicz * 667c662a31bSMichal Nazarewicz * TL;DR: To stop getting below error message in your kernel log, change 668c662a31bSMichal Nazarewicz * user space code using functionfs to align read buffers to a max 669c662a31bSMichal Nazarewicz * packet size. 670c662a31bSMichal Nazarewicz * 671c662a31bSMichal Nazarewicz * Some UDCs (e.g. dwc3) require request sizes to be a multiple of a max 672c662a31bSMichal Nazarewicz * packet size. When unaligned buffer is passed to functionfs, it 673c662a31bSMichal Nazarewicz * internally uses a larger, aligned buffer so that such UDCs are happy. 674c662a31bSMichal Nazarewicz * 675c662a31bSMichal Nazarewicz * Unfortunately, this means that host may send more data than was 676c662a31bSMichal Nazarewicz * requested in read(2) system call. f_fs doesn’t know what to do with 677c662a31bSMichal Nazarewicz * that excess data so it simply drops it. 678c662a31bSMichal Nazarewicz * 679c662a31bSMichal Nazarewicz * Was the buffer aligned in the first place, no such problem would 680c662a31bSMichal Nazarewicz * happen. 681c662a31bSMichal Nazarewicz * 6829353afbbSMichal Nazarewicz * Data may be dropped only in AIO reads. Synchronous reads are handled 6839353afbbSMichal Nazarewicz * by splitting a request into multiple parts. This splitting may still 6849353afbbSMichal Nazarewicz * be a problem though so it’s likely best to align the buffer 6859353afbbSMichal Nazarewicz * regardless of it being AIO or not.. 6869353afbbSMichal Nazarewicz * 687c662a31bSMichal Nazarewicz * This only affects OUT endpoints, i.e. reading data with a read(2), 688c662a31bSMichal Nazarewicz * aio_read(2) etc. system calls. Writing data to an IN endpoint is not 689c662a31bSMichal Nazarewicz * affected. 690c662a31bSMichal Nazarewicz */ 691c662a31bSMichal Nazarewicz pr_err("functionfs read size %d > requested size %zd, dropping excess data. " 692c662a31bSMichal Nazarewicz "Align read buffer size to max packet size to avoid the problem.\n", 693c662a31bSMichal Nazarewicz data_len, ret); 694c662a31bSMichal Nazarewicz 695c662a31bSMichal Nazarewicz return ret; 696c662a31bSMichal Nazarewicz } 697c662a31bSMichal Nazarewicz 69800a2430fSAndrzej Pietrasiewicz static void ffs_user_copy_worker(struct work_struct *work) 69900a2430fSAndrzej Pietrasiewicz { 70000a2430fSAndrzej Pietrasiewicz struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, 70100a2430fSAndrzej Pietrasiewicz work); 70200a2430fSAndrzej Pietrasiewicz int ret = io_data->req->status ? io_data->req->status : 70300a2430fSAndrzej Pietrasiewicz io_data->req->actual; 70438740a5bSLars-Peter Clausen bool kiocb_has_eventfd = io_data->kiocb->ki_flags & IOCB_EVENTFD; 70500a2430fSAndrzej Pietrasiewicz 70600a2430fSAndrzej Pietrasiewicz if (io_data->read && ret > 0) { 70700a2430fSAndrzej Pietrasiewicz use_mm(io_data->mm); 708c662a31bSMichal Nazarewicz ret = ffs_copy_to_iter(io_data->buf, ret, &io_data->data); 70900a2430fSAndrzej Pietrasiewicz unuse_mm(io_data->mm); 71000a2430fSAndrzej Pietrasiewicz } 71100a2430fSAndrzej Pietrasiewicz 71204b2fa9fSChristoph Hellwig io_data->kiocb->ki_complete(io_data->kiocb, ret, ret); 71300a2430fSAndrzej Pietrasiewicz 71438740a5bSLars-Peter Clausen if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd) 7155e33f6fdSRobert Baldyga eventfd_signal(io_data->ffs->ffs_eventfd, 1); 7165e33f6fdSRobert Baldyga 71700a2430fSAndrzej Pietrasiewicz usb_ep_free_request(io_data->ep, io_data->req); 71800a2430fSAndrzej Pietrasiewicz 71900a2430fSAndrzej Pietrasiewicz if (io_data->read) 720c993c39bSAl Viro kfree(io_data->to_free); 72100a2430fSAndrzej Pietrasiewicz kfree(io_data->buf); 72200a2430fSAndrzej Pietrasiewicz kfree(io_data); 72300a2430fSAndrzej Pietrasiewicz } 72400a2430fSAndrzej Pietrasiewicz 72500a2430fSAndrzej Pietrasiewicz static void ffs_epfile_async_io_complete(struct usb_ep *_ep, 72600a2430fSAndrzej Pietrasiewicz struct usb_request *req) 72700a2430fSAndrzej Pietrasiewicz { 72800a2430fSAndrzej Pietrasiewicz struct ffs_io_data *io_data = req->context; 72900a2430fSAndrzej Pietrasiewicz 73000a2430fSAndrzej Pietrasiewicz ENTER(); 73100a2430fSAndrzej Pietrasiewicz 73200a2430fSAndrzej Pietrasiewicz INIT_WORK(&io_data->work, ffs_user_copy_worker); 73300a2430fSAndrzej Pietrasiewicz schedule_work(&io_data->work); 73400a2430fSAndrzej Pietrasiewicz } 73500a2430fSAndrzej Pietrasiewicz 7369353afbbSMichal Nazarewicz /* Assumes epfile->mutex is held. */ 7379353afbbSMichal Nazarewicz static ssize_t __ffs_epfile_read_buffered(struct ffs_epfile *epfile, 7389353afbbSMichal Nazarewicz struct iov_iter *iter) 7399353afbbSMichal Nazarewicz { 7409353afbbSMichal Nazarewicz struct ffs_buffer *buf = epfile->read_buffer; 7419353afbbSMichal Nazarewicz ssize_t ret; 7429353afbbSMichal Nazarewicz if (!buf) 7439353afbbSMichal Nazarewicz return 0; 7449353afbbSMichal Nazarewicz 7459353afbbSMichal Nazarewicz ret = copy_to_iter(buf->data, buf->length, iter); 7469353afbbSMichal Nazarewicz if (buf->length == ret) { 7479353afbbSMichal Nazarewicz kfree(buf); 7489353afbbSMichal Nazarewicz epfile->read_buffer = NULL; 7499353afbbSMichal Nazarewicz } else if (unlikely(iov_iter_count(iter))) { 7509353afbbSMichal Nazarewicz ret = -EFAULT; 7519353afbbSMichal Nazarewicz } else { 7529353afbbSMichal Nazarewicz buf->length -= ret; 7539353afbbSMichal Nazarewicz buf->data += ret; 7549353afbbSMichal Nazarewicz } 7559353afbbSMichal Nazarewicz return ret; 7569353afbbSMichal Nazarewicz } 7579353afbbSMichal Nazarewicz 7589353afbbSMichal Nazarewicz /* Assumes epfile->mutex is held. */ 7599353afbbSMichal Nazarewicz static ssize_t __ffs_epfile_read_data(struct ffs_epfile *epfile, 7609353afbbSMichal Nazarewicz void *data, int data_len, 7619353afbbSMichal Nazarewicz struct iov_iter *iter) 7629353afbbSMichal Nazarewicz { 7639353afbbSMichal Nazarewicz struct ffs_buffer *buf; 7649353afbbSMichal Nazarewicz 7659353afbbSMichal Nazarewicz ssize_t ret = copy_to_iter(data, data_len, iter); 7669353afbbSMichal Nazarewicz if (likely(data_len == ret)) 7679353afbbSMichal Nazarewicz return ret; 7689353afbbSMichal Nazarewicz 7699353afbbSMichal Nazarewicz if (unlikely(iov_iter_count(iter))) 7709353afbbSMichal Nazarewicz return -EFAULT; 7719353afbbSMichal Nazarewicz 7729353afbbSMichal Nazarewicz /* See ffs_copy_to_iter for more context. */ 7739353afbbSMichal Nazarewicz pr_warn("functionfs read size %d > requested size %zd, splitting request into multiple reads.", 7749353afbbSMichal Nazarewicz data_len, ret); 7759353afbbSMichal Nazarewicz 7769353afbbSMichal Nazarewicz data_len -= ret; 7779353afbbSMichal Nazarewicz buf = kmalloc(sizeof(*buf) + data_len, GFP_KERNEL); 77844963d64SDan Carpenter if (!buf) 77944963d64SDan Carpenter return -ENOMEM; 7809353afbbSMichal Nazarewicz buf->length = data_len; 7819353afbbSMichal Nazarewicz buf->data = buf->storage; 7829353afbbSMichal Nazarewicz memcpy(buf->storage, data + ret, data_len); 7839353afbbSMichal Nazarewicz epfile->read_buffer = buf; 7849353afbbSMichal Nazarewicz 7859353afbbSMichal Nazarewicz return ret; 7869353afbbSMichal Nazarewicz } 7879353afbbSMichal Nazarewicz 78800a2430fSAndrzej Pietrasiewicz static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) 78900a2430fSAndrzej Pietrasiewicz { 79000a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = file->private_data; 791ae76e134SMichal Nazarewicz struct usb_request *req; 79200a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep; 79300a2430fSAndrzej Pietrasiewicz char *data = NULL; 794c0d31b3cSDavid Cohen ssize_t ret, data_len = -EINVAL; 79500a2430fSAndrzej Pietrasiewicz int halt; 79600a2430fSAndrzej Pietrasiewicz 79700a2430fSAndrzej Pietrasiewicz /* Are we still active? */ 798b3591f67SMichal Nazarewicz if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) 799b3591f67SMichal Nazarewicz return -ENODEV; 80000a2430fSAndrzej Pietrasiewicz 80100a2430fSAndrzej Pietrasiewicz /* Wait for endpoint to be enabled */ 80200a2430fSAndrzej Pietrasiewicz ep = epfile->ep; 80300a2430fSAndrzej Pietrasiewicz if (!ep) { 804b3591f67SMichal Nazarewicz if (file->f_flags & O_NONBLOCK) 805b3591f67SMichal Nazarewicz return -EAGAIN; 80600a2430fSAndrzej Pietrasiewicz 80700a2430fSAndrzej Pietrasiewicz ret = wait_event_interruptible(epfile->wait, (ep = epfile->ep)); 808b3591f67SMichal Nazarewicz if (ret) 809b3591f67SMichal Nazarewicz return -EINTR; 81000a2430fSAndrzej Pietrasiewicz } 81100a2430fSAndrzej Pietrasiewicz 81200a2430fSAndrzej Pietrasiewicz /* Do we halt? */ 81300a2430fSAndrzej Pietrasiewicz halt = (!io_data->read == !epfile->in); 814b3591f67SMichal Nazarewicz if (halt && epfile->isoc) 815b3591f67SMichal Nazarewicz return -EINVAL; 81600a2430fSAndrzej Pietrasiewicz 8179353afbbSMichal Nazarewicz /* We will be using request and read_buffer */ 8189353afbbSMichal Nazarewicz ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); 8199353afbbSMichal Nazarewicz if (unlikely(ret)) 8209353afbbSMichal Nazarewicz goto error; 8219353afbbSMichal Nazarewicz 82200a2430fSAndrzej Pietrasiewicz /* Allocate & copy */ 82300a2430fSAndrzej Pietrasiewicz if (!halt) { 8249353afbbSMichal Nazarewicz struct usb_gadget *gadget; 8259353afbbSMichal Nazarewicz 8269353afbbSMichal Nazarewicz /* 8279353afbbSMichal Nazarewicz * Do we have buffered data from previous partial read? Check 8289353afbbSMichal Nazarewicz * that for synchronous case only because we do not have 8299353afbbSMichal Nazarewicz * facility to ‘wake up’ a pending asynchronous read and push 8309353afbbSMichal Nazarewicz * buffered data to it which we would need to make things behave 8319353afbbSMichal Nazarewicz * consistently. 8329353afbbSMichal Nazarewicz */ 8339353afbbSMichal Nazarewicz if (!io_data->aio && io_data->read) { 8349353afbbSMichal Nazarewicz ret = __ffs_epfile_read_buffered(epfile, &io_data->data); 8359353afbbSMichal Nazarewicz if (ret) 8369353afbbSMichal Nazarewicz goto error_mutex; 8379353afbbSMichal Nazarewicz } 8389353afbbSMichal Nazarewicz 83900a2430fSAndrzej Pietrasiewicz /* 84000a2430fSAndrzej Pietrasiewicz * if we _do_ wait above, the epfile->ffs->gadget might be NULL 841ae76e134SMichal Nazarewicz * before the waiting completes, so do not assign to 'gadget' 842ae76e134SMichal Nazarewicz * earlier 84300a2430fSAndrzej Pietrasiewicz */ 8449353afbbSMichal Nazarewicz gadget = epfile->ffs->gadget; 84500a2430fSAndrzej Pietrasiewicz 84600a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 84700a2430fSAndrzej Pietrasiewicz /* In the meantime, endpoint got disabled or changed. */ 84800a2430fSAndrzej Pietrasiewicz if (epfile->ep != ep) { 8499353afbbSMichal Nazarewicz ret = -ESHUTDOWN; 8509353afbbSMichal Nazarewicz goto error_lock; 85100a2430fSAndrzej Pietrasiewicz } 852c993c39bSAl Viro data_len = iov_iter_count(&io_data->data); 85300a2430fSAndrzej Pietrasiewicz /* 85400a2430fSAndrzej Pietrasiewicz * Controller may require buffer size to be aligned to 85500a2430fSAndrzej Pietrasiewicz * maxpacketsize of an out endpoint. 85600a2430fSAndrzej Pietrasiewicz */ 857c993c39bSAl Viro if (io_data->read) 858c993c39bSAl Viro data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); 85900a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 86000a2430fSAndrzej Pietrasiewicz 86100a2430fSAndrzej Pietrasiewicz data = kmalloc(data_len, GFP_KERNEL); 8629353afbbSMichal Nazarewicz if (unlikely(!data)) { 8639353afbbSMichal Nazarewicz ret = -ENOMEM; 8649353afbbSMichal Nazarewicz goto error_mutex; 8659353afbbSMichal Nazarewicz } 8669353afbbSMichal Nazarewicz if (!io_data->read && 8679353afbbSMichal Nazarewicz copy_from_iter(data, data_len, &io_data->data) != data_len) { 86800a2430fSAndrzej Pietrasiewicz ret = -EFAULT; 8699353afbbSMichal Nazarewicz goto error_mutex; 87000a2430fSAndrzej Pietrasiewicz } 87100a2430fSAndrzej Pietrasiewicz } 87200a2430fSAndrzej Pietrasiewicz 87300a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 87400a2430fSAndrzej Pietrasiewicz 87500a2430fSAndrzej Pietrasiewicz if (epfile->ep != ep) { 87600a2430fSAndrzej Pietrasiewicz /* In the meantime, endpoint got disabled or changed. */ 87700a2430fSAndrzej Pietrasiewicz ret = -ESHUTDOWN; 87800a2430fSAndrzej Pietrasiewicz } else if (halt) { 87900a2430fSAndrzej Pietrasiewicz /* Halt */ 88000a2430fSAndrzej Pietrasiewicz if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) 88100a2430fSAndrzej Pietrasiewicz usb_ep_set_halt(ep->ep); 88200a2430fSAndrzej Pietrasiewicz ret = -EBADMSG; 883ae76e134SMichal Nazarewicz } else if (unlikely(data_len == -EINVAL)) { 884c0d31b3cSDavid Cohen /* 885c0d31b3cSDavid Cohen * Sanity Check: even though data_len can't be used 886c0d31b3cSDavid Cohen * uninitialized at the time I write this comment, some 887c0d31b3cSDavid Cohen * compilers complain about this situation. 888c0d31b3cSDavid Cohen * In order to keep the code clean from warnings, data_len is 889c0d31b3cSDavid Cohen * being initialized to -EINVAL during its declaration, which 890c0d31b3cSDavid Cohen * means we can't rely on compiler anymore to warn no future 891c0d31b3cSDavid Cohen * changes won't result in data_len being used uninitialized. 892c0d31b3cSDavid Cohen * For such reason, we're adding this redundant sanity check 893c0d31b3cSDavid Cohen * here. 894c0d31b3cSDavid Cohen */ 895c0d31b3cSDavid Cohen WARN(1, "%s: data_len == -EINVAL\n", __func__); 896c0d31b3cSDavid Cohen ret = -EINVAL; 897ae76e134SMichal Nazarewicz } else if (!io_data->aio) { 898ae76e134SMichal Nazarewicz DECLARE_COMPLETION_ONSTACK(done); 899ef150884SDu, Changbin bool interrupted = false; 900ae76e134SMichal Nazarewicz 901ae76e134SMichal Nazarewicz req = ep->req; 902ae76e134SMichal Nazarewicz req->buf = data; 903ae76e134SMichal Nazarewicz req->length = data_len; 904ae76e134SMichal Nazarewicz 905ae76e134SMichal Nazarewicz req->context = &done; 906ae76e134SMichal Nazarewicz req->complete = ffs_epfile_io_complete; 907ae76e134SMichal Nazarewicz 908ae76e134SMichal Nazarewicz ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); 909ae76e134SMichal Nazarewicz if (unlikely(ret < 0)) 910c0d31b3cSDavid Cohen goto error_lock; 911ae76e134SMichal Nazarewicz 912ae76e134SMichal Nazarewicz spin_unlock_irq(&epfile->ffs->eps_lock); 913ae76e134SMichal Nazarewicz 914ae76e134SMichal Nazarewicz if (unlikely(wait_for_completion_interruptible(&done))) { 915ef150884SDu, Changbin /* 916ef150884SDu, Changbin * To avoid race condition with ffs_epfile_io_complete, 917ef150884SDu, Changbin * dequeue the request first then check 918ef150884SDu, Changbin * status. usb_ep_dequeue API should guarantee no race 919ef150884SDu, Changbin * condition with req->complete callback. 920ef150884SDu, Changbin */ 921ae76e134SMichal Nazarewicz usb_ep_dequeue(ep->ep, req); 922ef150884SDu, Changbin interrupted = ep->status < 0; 923c0d31b3cSDavid Cohen } 924c0d31b3cSDavid Cohen 925c662a31bSMichal Nazarewicz if (interrupted) 926c662a31bSMichal Nazarewicz ret = -EINTR; 927c662a31bSMichal Nazarewicz else if (io_data->read && ep->status > 0) 9289353afbbSMichal Nazarewicz ret = __ffs_epfile_read_data(epfile, data, ep->status, 929c662a31bSMichal Nazarewicz &io_data->data); 930c662a31bSMichal Nazarewicz else 931c662a31bSMichal Nazarewicz ret = ep->status; 932ae76e134SMichal Nazarewicz goto error_mutex; 933ae76e134SMichal Nazarewicz } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_KERNEL))) { 9343163c79eSMichal Nazarewicz ret = -ENOMEM; 935ae76e134SMichal Nazarewicz } else { 93600a2430fSAndrzej Pietrasiewicz req->buf = data; 937c0d31b3cSDavid Cohen req->length = data_len; 93800a2430fSAndrzej Pietrasiewicz 93900a2430fSAndrzej Pietrasiewicz io_data->buf = data; 94000a2430fSAndrzej Pietrasiewicz io_data->ep = ep->ep; 94100a2430fSAndrzej Pietrasiewicz io_data->req = req; 9425e33f6fdSRobert Baldyga io_data->ffs = epfile->ffs; 94300a2430fSAndrzej Pietrasiewicz 94400a2430fSAndrzej Pietrasiewicz req->context = io_data; 94500a2430fSAndrzej Pietrasiewicz req->complete = ffs_epfile_async_io_complete; 94600a2430fSAndrzej Pietrasiewicz 94700a2430fSAndrzej Pietrasiewicz ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); 94800a2430fSAndrzej Pietrasiewicz if (unlikely(ret)) { 94900a2430fSAndrzej Pietrasiewicz usb_ep_free_request(ep->ep, req); 95000a2430fSAndrzej Pietrasiewicz goto error_lock; 95100a2430fSAndrzej Pietrasiewicz } 952ae76e134SMichal Nazarewicz 95300a2430fSAndrzej Pietrasiewicz ret = -EIOCBQUEUED; 95400a2430fSAndrzej Pietrasiewicz /* 955ae76e134SMichal Nazarewicz * Do not kfree the buffer in this function. It will be freed 956ae76e134SMichal Nazarewicz * by ffs_user_copy_worker. 95700a2430fSAndrzej Pietrasiewicz */ 958ae76e134SMichal Nazarewicz data = NULL; 95900a2430fSAndrzej Pietrasiewicz } 96000a2430fSAndrzej Pietrasiewicz 96100a2430fSAndrzej Pietrasiewicz error_lock: 96200a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 963ae76e134SMichal Nazarewicz error_mutex: 96400a2430fSAndrzej Pietrasiewicz mutex_unlock(&epfile->mutex); 96500a2430fSAndrzej Pietrasiewicz error: 96600a2430fSAndrzej Pietrasiewicz kfree(data); 96700a2430fSAndrzej Pietrasiewicz return ret; 96800a2430fSAndrzej Pietrasiewicz } 96900a2430fSAndrzej Pietrasiewicz 97000a2430fSAndrzej Pietrasiewicz static int 97100a2430fSAndrzej Pietrasiewicz ffs_epfile_open(struct inode *inode, struct file *file) 97200a2430fSAndrzej Pietrasiewicz { 97300a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = inode->i_private; 97400a2430fSAndrzej Pietrasiewicz 97500a2430fSAndrzej Pietrasiewicz ENTER(); 97600a2430fSAndrzej Pietrasiewicz 97700a2430fSAndrzej Pietrasiewicz if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) 97800a2430fSAndrzej Pietrasiewicz return -ENODEV; 97900a2430fSAndrzej Pietrasiewicz 98000a2430fSAndrzej Pietrasiewicz file->private_data = epfile; 98100a2430fSAndrzej Pietrasiewicz ffs_data_opened(epfile->ffs); 98200a2430fSAndrzej Pietrasiewicz 98300a2430fSAndrzej Pietrasiewicz return 0; 98400a2430fSAndrzej Pietrasiewicz } 98500a2430fSAndrzej Pietrasiewicz 98600a2430fSAndrzej Pietrasiewicz static int ffs_aio_cancel(struct kiocb *kiocb) 98700a2430fSAndrzej Pietrasiewicz { 98800a2430fSAndrzej Pietrasiewicz struct ffs_io_data *io_data = kiocb->private; 98900a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = kiocb->ki_filp->private_data; 99000a2430fSAndrzej Pietrasiewicz int value; 99100a2430fSAndrzej Pietrasiewicz 99200a2430fSAndrzej Pietrasiewicz ENTER(); 99300a2430fSAndrzej Pietrasiewicz 99400a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 99500a2430fSAndrzej Pietrasiewicz 99600a2430fSAndrzej Pietrasiewicz if (likely(io_data && io_data->ep && io_data->req)) 99700a2430fSAndrzej Pietrasiewicz value = usb_ep_dequeue(io_data->ep, io_data->req); 99800a2430fSAndrzej Pietrasiewicz else 99900a2430fSAndrzej Pietrasiewicz value = -EINVAL; 100000a2430fSAndrzej Pietrasiewicz 100100a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 100200a2430fSAndrzej Pietrasiewicz 100300a2430fSAndrzej Pietrasiewicz return value; 100400a2430fSAndrzej Pietrasiewicz } 100500a2430fSAndrzej Pietrasiewicz 100670e60d91SAl Viro static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) 100700a2430fSAndrzej Pietrasiewicz { 100870e60d91SAl Viro struct ffs_io_data io_data, *p = &io_data; 1009de2080d4SAl Viro ssize_t res; 101000a2430fSAndrzej Pietrasiewicz 101100a2430fSAndrzej Pietrasiewicz ENTER(); 101200a2430fSAndrzej Pietrasiewicz 101370e60d91SAl Viro if (!is_sync_kiocb(kiocb)) { 101470e60d91SAl Viro p = kmalloc(sizeof(io_data), GFP_KERNEL); 101570e60d91SAl Viro if (unlikely(!p)) 101600a2430fSAndrzej Pietrasiewicz return -ENOMEM; 101770e60d91SAl Viro p->aio = true; 101870e60d91SAl Viro } else { 101970e60d91SAl Viro p->aio = false; 102070e60d91SAl Viro } 102100a2430fSAndrzej Pietrasiewicz 102270e60d91SAl Viro p->read = false; 102370e60d91SAl Viro p->kiocb = kiocb; 102470e60d91SAl Viro p->data = *from; 102570e60d91SAl Viro p->mm = current->mm; 102600a2430fSAndrzej Pietrasiewicz 102770e60d91SAl Viro kiocb->private = p; 102800a2430fSAndrzej Pietrasiewicz 10294088acf1SRui Miguel Silva if (p->aio) 103000a2430fSAndrzej Pietrasiewicz kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); 103100a2430fSAndrzej Pietrasiewicz 103270e60d91SAl Viro res = ffs_epfile_io(kiocb->ki_filp, p); 103370e60d91SAl Viro if (res == -EIOCBQUEUED) 103470e60d91SAl Viro return res; 103570e60d91SAl Viro if (p->aio) 103670e60d91SAl Viro kfree(p); 103770e60d91SAl Viro else 103870e60d91SAl Viro *from = p->data; 1039de2080d4SAl Viro return res; 104000a2430fSAndrzej Pietrasiewicz } 104100a2430fSAndrzej Pietrasiewicz 104270e60d91SAl Viro static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) 104300a2430fSAndrzej Pietrasiewicz { 104470e60d91SAl Viro struct ffs_io_data io_data, *p = &io_data; 1045de2080d4SAl Viro ssize_t res; 104600a2430fSAndrzej Pietrasiewicz 104700a2430fSAndrzej Pietrasiewicz ENTER(); 104800a2430fSAndrzej Pietrasiewicz 104970e60d91SAl Viro if (!is_sync_kiocb(kiocb)) { 105070e60d91SAl Viro p = kmalloc(sizeof(io_data), GFP_KERNEL); 105170e60d91SAl Viro if (unlikely(!p)) 105200a2430fSAndrzej Pietrasiewicz return -ENOMEM; 105370e60d91SAl Viro p->aio = true; 105470e60d91SAl Viro } else { 105570e60d91SAl Viro p->aio = false; 105600a2430fSAndrzej Pietrasiewicz } 105700a2430fSAndrzej Pietrasiewicz 105870e60d91SAl Viro p->read = true; 105970e60d91SAl Viro p->kiocb = kiocb; 106070e60d91SAl Viro if (p->aio) { 106170e60d91SAl Viro p->to_free = dup_iter(&p->data, to, GFP_KERNEL); 106270e60d91SAl Viro if (!p->to_free) { 106370e60d91SAl Viro kfree(p); 106470e60d91SAl Viro return -ENOMEM; 106570e60d91SAl Viro } 106670e60d91SAl Viro } else { 106770e60d91SAl Viro p->data = *to; 106870e60d91SAl Viro p->to_free = NULL; 106970e60d91SAl Viro } 107070e60d91SAl Viro p->mm = current->mm; 107100a2430fSAndrzej Pietrasiewicz 107270e60d91SAl Viro kiocb->private = p; 107300a2430fSAndrzej Pietrasiewicz 10744088acf1SRui Miguel Silva if (p->aio) 107500a2430fSAndrzej Pietrasiewicz kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); 107600a2430fSAndrzej Pietrasiewicz 107770e60d91SAl Viro res = ffs_epfile_io(kiocb->ki_filp, p); 107870e60d91SAl Viro if (res == -EIOCBQUEUED) 107970e60d91SAl Viro return res; 108070e60d91SAl Viro 108170e60d91SAl Viro if (p->aio) { 108270e60d91SAl Viro kfree(p->to_free); 108370e60d91SAl Viro kfree(p); 108470e60d91SAl Viro } else { 108570e60d91SAl Viro *to = p->data; 1086de2080d4SAl Viro } 1087de2080d4SAl Viro return res; 108800a2430fSAndrzej Pietrasiewicz } 108900a2430fSAndrzej Pietrasiewicz 109000a2430fSAndrzej Pietrasiewicz static int 109100a2430fSAndrzej Pietrasiewicz ffs_epfile_release(struct inode *inode, struct file *file) 109200a2430fSAndrzej Pietrasiewicz { 109300a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = inode->i_private; 109400a2430fSAndrzej Pietrasiewicz 109500a2430fSAndrzej Pietrasiewicz ENTER(); 109600a2430fSAndrzej Pietrasiewicz 10979353afbbSMichal Nazarewicz kfree(epfile->read_buffer); 10989353afbbSMichal Nazarewicz epfile->read_buffer = NULL; 109900a2430fSAndrzej Pietrasiewicz ffs_data_closed(epfile->ffs); 110000a2430fSAndrzej Pietrasiewicz 110100a2430fSAndrzej Pietrasiewicz return 0; 110200a2430fSAndrzej Pietrasiewicz } 110300a2430fSAndrzej Pietrasiewicz 110400a2430fSAndrzej Pietrasiewicz static long ffs_epfile_ioctl(struct file *file, unsigned code, 110500a2430fSAndrzej Pietrasiewicz unsigned long value) 110600a2430fSAndrzej Pietrasiewicz { 110700a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = file->private_data; 110800a2430fSAndrzej Pietrasiewicz int ret; 110900a2430fSAndrzej Pietrasiewicz 111000a2430fSAndrzej Pietrasiewicz ENTER(); 111100a2430fSAndrzej Pietrasiewicz 111200a2430fSAndrzej Pietrasiewicz if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) 111300a2430fSAndrzej Pietrasiewicz return -ENODEV; 111400a2430fSAndrzej Pietrasiewicz 111500a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 111600a2430fSAndrzej Pietrasiewicz if (likely(epfile->ep)) { 111700a2430fSAndrzej Pietrasiewicz switch (code) { 111800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_FIFO_STATUS: 111900a2430fSAndrzej Pietrasiewicz ret = usb_ep_fifo_status(epfile->ep->ep); 112000a2430fSAndrzej Pietrasiewicz break; 112100a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_FIFO_FLUSH: 112200a2430fSAndrzej Pietrasiewicz usb_ep_fifo_flush(epfile->ep->ep); 112300a2430fSAndrzej Pietrasiewicz ret = 0; 112400a2430fSAndrzej Pietrasiewicz break; 112500a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_CLEAR_HALT: 112600a2430fSAndrzej Pietrasiewicz ret = usb_ep_clear_halt(epfile->ep->ep); 112700a2430fSAndrzej Pietrasiewicz break; 112800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_ENDPOINT_REVMAP: 112900a2430fSAndrzej Pietrasiewicz ret = epfile->ep->num; 113000a2430fSAndrzej Pietrasiewicz break; 1131c559a353SRobert Baldyga case FUNCTIONFS_ENDPOINT_DESC: 1132c559a353SRobert Baldyga { 1133c559a353SRobert Baldyga int desc_idx; 1134c559a353SRobert Baldyga struct usb_endpoint_descriptor *desc; 1135c559a353SRobert Baldyga 1136c559a353SRobert Baldyga switch (epfile->ffs->gadget->speed) { 1137c559a353SRobert Baldyga case USB_SPEED_SUPER: 1138c559a353SRobert Baldyga desc_idx = 2; 1139c559a353SRobert Baldyga break; 1140c559a353SRobert Baldyga case USB_SPEED_HIGH: 1141c559a353SRobert Baldyga desc_idx = 1; 1142c559a353SRobert Baldyga break; 1143c559a353SRobert Baldyga default: 1144c559a353SRobert Baldyga desc_idx = 0; 1145c559a353SRobert Baldyga } 1146c559a353SRobert Baldyga desc = epfile->ep->descs[desc_idx]; 1147c559a353SRobert Baldyga 1148c559a353SRobert Baldyga spin_unlock_irq(&epfile->ffs->eps_lock); 1149c559a353SRobert Baldyga ret = copy_to_user((void *)value, desc, sizeof(*desc)); 1150c559a353SRobert Baldyga if (ret) 1151c559a353SRobert Baldyga ret = -EFAULT; 1152c559a353SRobert Baldyga return ret; 1153c559a353SRobert Baldyga } 115400a2430fSAndrzej Pietrasiewicz default: 115500a2430fSAndrzej Pietrasiewicz ret = -ENOTTY; 115600a2430fSAndrzej Pietrasiewicz } 115700a2430fSAndrzej Pietrasiewicz } else { 115800a2430fSAndrzej Pietrasiewicz ret = -ENODEV; 115900a2430fSAndrzej Pietrasiewicz } 116000a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 116100a2430fSAndrzej Pietrasiewicz 116200a2430fSAndrzej Pietrasiewicz return ret; 116300a2430fSAndrzej Pietrasiewicz } 116400a2430fSAndrzej Pietrasiewicz 116500a2430fSAndrzej Pietrasiewicz static const struct file_operations ffs_epfile_operations = { 116600a2430fSAndrzej Pietrasiewicz .llseek = no_llseek, 116700a2430fSAndrzej Pietrasiewicz 116800a2430fSAndrzej Pietrasiewicz .open = ffs_epfile_open, 116970e60d91SAl Viro .write_iter = ffs_epfile_write_iter, 117070e60d91SAl Viro .read_iter = ffs_epfile_read_iter, 117100a2430fSAndrzej Pietrasiewicz .release = ffs_epfile_release, 117200a2430fSAndrzej Pietrasiewicz .unlocked_ioctl = ffs_epfile_ioctl, 117300a2430fSAndrzej Pietrasiewicz }; 117400a2430fSAndrzej Pietrasiewicz 117500a2430fSAndrzej Pietrasiewicz 117600a2430fSAndrzej Pietrasiewicz /* File system and super block operations ***********************************/ 117700a2430fSAndrzej Pietrasiewicz 117800a2430fSAndrzej Pietrasiewicz /* 117900a2430fSAndrzej Pietrasiewicz * Mounting the file system creates a controller file, used first for 118000a2430fSAndrzej Pietrasiewicz * function configuration then later for event monitoring. 118100a2430fSAndrzej Pietrasiewicz */ 118200a2430fSAndrzej Pietrasiewicz 118300a2430fSAndrzej Pietrasiewicz static struct inode *__must_check 118400a2430fSAndrzej Pietrasiewicz ffs_sb_make_inode(struct super_block *sb, void *data, 118500a2430fSAndrzej Pietrasiewicz const struct file_operations *fops, 118600a2430fSAndrzej Pietrasiewicz const struct inode_operations *iops, 118700a2430fSAndrzej Pietrasiewicz struct ffs_file_perms *perms) 118800a2430fSAndrzej Pietrasiewicz { 118900a2430fSAndrzej Pietrasiewicz struct inode *inode; 119000a2430fSAndrzej Pietrasiewicz 119100a2430fSAndrzej Pietrasiewicz ENTER(); 119200a2430fSAndrzej Pietrasiewicz 119300a2430fSAndrzej Pietrasiewicz inode = new_inode(sb); 119400a2430fSAndrzej Pietrasiewicz 119500a2430fSAndrzej Pietrasiewicz if (likely(inode)) { 1196078cd827SDeepa Dinamani struct timespec ts = current_time(inode); 119700a2430fSAndrzej Pietrasiewicz 119800a2430fSAndrzej Pietrasiewicz inode->i_ino = get_next_ino(); 119900a2430fSAndrzej Pietrasiewicz inode->i_mode = perms->mode; 120000a2430fSAndrzej Pietrasiewicz inode->i_uid = perms->uid; 120100a2430fSAndrzej Pietrasiewicz inode->i_gid = perms->gid; 1202078cd827SDeepa Dinamani inode->i_atime = ts; 1203078cd827SDeepa Dinamani inode->i_mtime = ts; 1204078cd827SDeepa Dinamani inode->i_ctime = ts; 120500a2430fSAndrzej Pietrasiewicz inode->i_private = data; 120600a2430fSAndrzej Pietrasiewicz if (fops) 120700a2430fSAndrzej Pietrasiewicz inode->i_fop = fops; 120800a2430fSAndrzej Pietrasiewicz if (iops) 120900a2430fSAndrzej Pietrasiewicz inode->i_op = iops; 121000a2430fSAndrzej Pietrasiewicz } 121100a2430fSAndrzej Pietrasiewicz 121200a2430fSAndrzej Pietrasiewicz return inode; 121300a2430fSAndrzej Pietrasiewicz } 121400a2430fSAndrzej Pietrasiewicz 121500a2430fSAndrzej Pietrasiewicz /* Create "regular" file */ 12161bb27cacSAl Viro static struct dentry *ffs_sb_create_file(struct super_block *sb, 121700a2430fSAndrzej Pietrasiewicz const char *name, void *data, 12181bb27cacSAl Viro const struct file_operations *fops) 121900a2430fSAndrzej Pietrasiewicz { 122000a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = sb->s_fs_info; 122100a2430fSAndrzej Pietrasiewicz struct dentry *dentry; 122200a2430fSAndrzej Pietrasiewicz struct inode *inode; 122300a2430fSAndrzej Pietrasiewicz 122400a2430fSAndrzej Pietrasiewicz ENTER(); 122500a2430fSAndrzej Pietrasiewicz 122600a2430fSAndrzej Pietrasiewicz dentry = d_alloc_name(sb->s_root, name); 122700a2430fSAndrzej Pietrasiewicz if (unlikely(!dentry)) 122800a2430fSAndrzej Pietrasiewicz return NULL; 122900a2430fSAndrzej Pietrasiewicz 123000a2430fSAndrzej Pietrasiewicz inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); 123100a2430fSAndrzej Pietrasiewicz if (unlikely(!inode)) { 123200a2430fSAndrzej Pietrasiewicz dput(dentry); 123300a2430fSAndrzej Pietrasiewicz return NULL; 123400a2430fSAndrzej Pietrasiewicz } 123500a2430fSAndrzej Pietrasiewicz 123600a2430fSAndrzej Pietrasiewicz d_add(dentry, inode); 12371bb27cacSAl Viro return dentry; 123800a2430fSAndrzej Pietrasiewicz } 123900a2430fSAndrzej Pietrasiewicz 124000a2430fSAndrzej Pietrasiewicz /* Super block */ 124100a2430fSAndrzej Pietrasiewicz static const struct super_operations ffs_sb_operations = { 124200a2430fSAndrzej Pietrasiewicz .statfs = simple_statfs, 124300a2430fSAndrzej Pietrasiewicz .drop_inode = generic_delete_inode, 124400a2430fSAndrzej Pietrasiewicz }; 124500a2430fSAndrzej Pietrasiewicz 124600a2430fSAndrzej Pietrasiewicz struct ffs_sb_fill_data { 124700a2430fSAndrzej Pietrasiewicz struct ffs_file_perms perms; 124800a2430fSAndrzej Pietrasiewicz umode_t root_mode; 124900a2430fSAndrzej Pietrasiewicz const char *dev_name; 125018d6b32fSRobert Baldyga bool no_disconnect; 125100a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs_data; 125200a2430fSAndrzej Pietrasiewicz }; 125300a2430fSAndrzej Pietrasiewicz 125400a2430fSAndrzej Pietrasiewicz static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) 125500a2430fSAndrzej Pietrasiewicz { 125600a2430fSAndrzej Pietrasiewicz struct ffs_sb_fill_data *data = _data; 125700a2430fSAndrzej Pietrasiewicz struct inode *inode; 125800a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = data->ffs_data; 125900a2430fSAndrzej Pietrasiewicz 126000a2430fSAndrzej Pietrasiewicz ENTER(); 126100a2430fSAndrzej Pietrasiewicz 126200a2430fSAndrzej Pietrasiewicz ffs->sb = sb; 126300a2430fSAndrzej Pietrasiewicz data->ffs_data = NULL; 126400a2430fSAndrzej Pietrasiewicz sb->s_fs_info = ffs; 126509cbfeafSKirill A. Shutemov sb->s_blocksize = PAGE_SIZE; 126609cbfeafSKirill A. Shutemov sb->s_blocksize_bits = PAGE_SHIFT; 126700a2430fSAndrzej Pietrasiewicz sb->s_magic = FUNCTIONFS_MAGIC; 126800a2430fSAndrzej Pietrasiewicz sb->s_op = &ffs_sb_operations; 126900a2430fSAndrzej Pietrasiewicz sb->s_time_gran = 1; 127000a2430fSAndrzej Pietrasiewicz 127100a2430fSAndrzej Pietrasiewicz /* Root inode */ 127200a2430fSAndrzej Pietrasiewicz data->perms.mode = data->root_mode; 127300a2430fSAndrzej Pietrasiewicz inode = ffs_sb_make_inode(sb, NULL, 127400a2430fSAndrzej Pietrasiewicz &simple_dir_operations, 127500a2430fSAndrzej Pietrasiewicz &simple_dir_inode_operations, 127600a2430fSAndrzej Pietrasiewicz &data->perms); 127700a2430fSAndrzej Pietrasiewicz sb->s_root = d_make_root(inode); 127800a2430fSAndrzej Pietrasiewicz if (unlikely(!sb->s_root)) 127900a2430fSAndrzej Pietrasiewicz return -ENOMEM; 128000a2430fSAndrzej Pietrasiewicz 128100a2430fSAndrzej Pietrasiewicz /* EP0 file */ 128200a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, 12831bb27cacSAl Viro &ffs_ep0_operations))) 128400a2430fSAndrzej Pietrasiewicz return -ENOMEM; 128500a2430fSAndrzej Pietrasiewicz 128600a2430fSAndrzej Pietrasiewicz return 0; 128700a2430fSAndrzej Pietrasiewicz } 128800a2430fSAndrzej Pietrasiewicz 128900a2430fSAndrzej Pietrasiewicz static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) 129000a2430fSAndrzej Pietrasiewicz { 129100a2430fSAndrzej Pietrasiewicz ENTER(); 129200a2430fSAndrzej Pietrasiewicz 129300a2430fSAndrzej Pietrasiewicz if (!opts || !*opts) 129400a2430fSAndrzej Pietrasiewicz return 0; 129500a2430fSAndrzej Pietrasiewicz 129600a2430fSAndrzej Pietrasiewicz for (;;) { 129700a2430fSAndrzej Pietrasiewicz unsigned long value; 129800a2430fSAndrzej Pietrasiewicz char *eq, *comma; 129900a2430fSAndrzej Pietrasiewicz 130000a2430fSAndrzej Pietrasiewicz /* Option limit */ 130100a2430fSAndrzej Pietrasiewicz comma = strchr(opts, ','); 130200a2430fSAndrzej Pietrasiewicz if (comma) 130300a2430fSAndrzej Pietrasiewicz *comma = 0; 130400a2430fSAndrzej Pietrasiewicz 130500a2430fSAndrzej Pietrasiewicz /* Value limit */ 130600a2430fSAndrzej Pietrasiewicz eq = strchr(opts, '='); 130700a2430fSAndrzej Pietrasiewicz if (unlikely(!eq)) { 130800a2430fSAndrzej Pietrasiewicz pr_err("'=' missing in %s\n", opts); 130900a2430fSAndrzej Pietrasiewicz return -EINVAL; 131000a2430fSAndrzej Pietrasiewicz } 131100a2430fSAndrzej Pietrasiewicz *eq = 0; 131200a2430fSAndrzej Pietrasiewicz 131300a2430fSAndrzej Pietrasiewicz /* Parse value */ 131400a2430fSAndrzej Pietrasiewicz if (kstrtoul(eq + 1, 0, &value)) { 131500a2430fSAndrzej Pietrasiewicz pr_err("%s: invalid value: %s\n", opts, eq + 1); 131600a2430fSAndrzej Pietrasiewicz return -EINVAL; 131700a2430fSAndrzej Pietrasiewicz } 131800a2430fSAndrzej Pietrasiewicz 131900a2430fSAndrzej Pietrasiewicz /* Interpret option */ 132000a2430fSAndrzej Pietrasiewicz switch (eq - opts) { 132118d6b32fSRobert Baldyga case 13: 132218d6b32fSRobert Baldyga if (!memcmp(opts, "no_disconnect", 13)) 132318d6b32fSRobert Baldyga data->no_disconnect = !!value; 132418d6b32fSRobert Baldyga else 132518d6b32fSRobert Baldyga goto invalid; 132618d6b32fSRobert Baldyga break; 132700a2430fSAndrzej Pietrasiewicz case 5: 132800a2430fSAndrzej Pietrasiewicz if (!memcmp(opts, "rmode", 5)) 132900a2430fSAndrzej Pietrasiewicz data->root_mode = (value & 0555) | S_IFDIR; 133000a2430fSAndrzej Pietrasiewicz else if (!memcmp(opts, "fmode", 5)) 133100a2430fSAndrzej Pietrasiewicz data->perms.mode = (value & 0666) | S_IFREG; 133200a2430fSAndrzej Pietrasiewicz else 133300a2430fSAndrzej Pietrasiewicz goto invalid; 133400a2430fSAndrzej Pietrasiewicz break; 133500a2430fSAndrzej Pietrasiewicz 133600a2430fSAndrzej Pietrasiewicz case 4: 133700a2430fSAndrzej Pietrasiewicz if (!memcmp(opts, "mode", 4)) { 133800a2430fSAndrzej Pietrasiewicz data->root_mode = (value & 0555) | S_IFDIR; 133900a2430fSAndrzej Pietrasiewicz data->perms.mode = (value & 0666) | S_IFREG; 134000a2430fSAndrzej Pietrasiewicz } else { 134100a2430fSAndrzej Pietrasiewicz goto invalid; 134200a2430fSAndrzej Pietrasiewicz } 134300a2430fSAndrzej Pietrasiewicz break; 134400a2430fSAndrzej Pietrasiewicz 134500a2430fSAndrzej Pietrasiewicz case 3: 134600a2430fSAndrzej Pietrasiewicz if (!memcmp(opts, "uid", 3)) { 134700a2430fSAndrzej Pietrasiewicz data->perms.uid = make_kuid(current_user_ns(), value); 134800a2430fSAndrzej Pietrasiewicz if (!uid_valid(data->perms.uid)) { 134900a2430fSAndrzej Pietrasiewicz pr_err("%s: unmapped value: %lu\n", opts, value); 135000a2430fSAndrzej Pietrasiewicz return -EINVAL; 135100a2430fSAndrzej Pietrasiewicz } 135200a2430fSAndrzej Pietrasiewicz } else if (!memcmp(opts, "gid", 3)) { 135300a2430fSAndrzej Pietrasiewicz data->perms.gid = make_kgid(current_user_ns(), value); 135400a2430fSAndrzej Pietrasiewicz if (!gid_valid(data->perms.gid)) { 135500a2430fSAndrzej Pietrasiewicz pr_err("%s: unmapped value: %lu\n", opts, value); 135600a2430fSAndrzej Pietrasiewicz return -EINVAL; 135700a2430fSAndrzej Pietrasiewicz } 135800a2430fSAndrzej Pietrasiewicz } else { 135900a2430fSAndrzej Pietrasiewicz goto invalid; 136000a2430fSAndrzej Pietrasiewicz } 136100a2430fSAndrzej Pietrasiewicz break; 136200a2430fSAndrzej Pietrasiewicz 136300a2430fSAndrzej Pietrasiewicz default: 136400a2430fSAndrzej Pietrasiewicz invalid: 136500a2430fSAndrzej Pietrasiewicz pr_err("%s: invalid option\n", opts); 136600a2430fSAndrzej Pietrasiewicz return -EINVAL; 136700a2430fSAndrzej Pietrasiewicz } 136800a2430fSAndrzej Pietrasiewicz 136900a2430fSAndrzej Pietrasiewicz /* Next iteration */ 137000a2430fSAndrzej Pietrasiewicz if (!comma) 137100a2430fSAndrzej Pietrasiewicz break; 137200a2430fSAndrzej Pietrasiewicz opts = comma + 1; 137300a2430fSAndrzej Pietrasiewicz } 137400a2430fSAndrzej Pietrasiewicz 137500a2430fSAndrzej Pietrasiewicz return 0; 137600a2430fSAndrzej Pietrasiewicz } 137700a2430fSAndrzej Pietrasiewicz 137800a2430fSAndrzej Pietrasiewicz /* "mount -t functionfs dev_name /dev/function" ends up here */ 137900a2430fSAndrzej Pietrasiewicz 138000a2430fSAndrzej Pietrasiewicz static struct dentry * 138100a2430fSAndrzej Pietrasiewicz ffs_fs_mount(struct file_system_type *t, int flags, 138200a2430fSAndrzej Pietrasiewicz const char *dev_name, void *opts) 138300a2430fSAndrzej Pietrasiewicz { 138400a2430fSAndrzej Pietrasiewicz struct ffs_sb_fill_data data = { 138500a2430fSAndrzej Pietrasiewicz .perms = { 138600a2430fSAndrzej Pietrasiewicz .mode = S_IFREG | 0600, 138700a2430fSAndrzej Pietrasiewicz .uid = GLOBAL_ROOT_UID, 138800a2430fSAndrzej Pietrasiewicz .gid = GLOBAL_ROOT_GID, 138900a2430fSAndrzej Pietrasiewicz }, 139000a2430fSAndrzej Pietrasiewicz .root_mode = S_IFDIR | 0500, 139118d6b32fSRobert Baldyga .no_disconnect = false, 139200a2430fSAndrzej Pietrasiewicz }; 139300a2430fSAndrzej Pietrasiewicz struct dentry *rv; 139400a2430fSAndrzej Pietrasiewicz int ret; 139500a2430fSAndrzej Pietrasiewicz void *ffs_dev; 139600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs; 139700a2430fSAndrzej Pietrasiewicz 139800a2430fSAndrzej Pietrasiewicz ENTER(); 139900a2430fSAndrzej Pietrasiewicz 140000a2430fSAndrzej Pietrasiewicz ret = ffs_fs_parse_opts(&data, opts); 140100a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 140200a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 140300a2430fSAndrzej Pietrasiewicz 140400a2430fSAndrzej Pietrasiewicz ffs = ffs_data_new(); 140500a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs)) 140600a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 140700a2430fSAndrzej Pietrasiewicz ffs->file_perms = data.perms; 140818d6b32fSRobert Baldyga ffs->no_disconnect = data.no_disconnect; 140900a2430fSAndrzej Pietrasiewicz 141000a2430fSAndrzej Pietrasiewicz ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); 141100a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs->dev_name)) { 141200a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 141300a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 141400a2430fSAndrzej Pietrasiewicz } 141500a2430fSAndrzej Pietrasiewicz 141600a2430fSAndrzej Pietrasiewicz ffs_dev = ffs_acquire_dev(dev_name); 141700a2430fSAndrzej Pietrasiewicz if (IS_ERR(ffs_dev)) { 141800a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 141900a2430fSAndrzej Pietrasiewicz return ERR_CAST(ffs_dev); 142000a2430fSAndrzej Pietrasiewicz } 142100a2430fSAndrzej Pietrasiewicz ffs->private_data = ffs_dev; 142200a2430fSAndrzej Pietrasiewicz data.ffs_data = ffs; 142300a2430fSAndrzej Pietrasiewicz 142400a2430fSAndrzej Pietrasiewicz rv = mount_nodev(t, flags, &data, ffs_sb_fill); 142500a2430fSAndrzej Pietrasiewicz if (IS_ERR(rv) && data.ffs_data) { 142600a2430fSAndrzej Pietrasiewicz ffs_release_dev(data.ffs_data); 142700a2430fSAndrzej Pietrasiewicz ffs_data_put(data.ffs_data); 142800a2430fSAndrzej Pietrasiewicz } 142900a2430fSAndrzej Pietrasiewicz return rv; 143000a2430fSAndrzej Pietrasiewicz } 143100a2430fSAndrzej Pietrasiewicz 143200a2430fSAndrzej Pietrasiewicz static void 143300a2430fSAndrzej Pietrasiewicz ffs_fs_kill_sb(struct super_block *sb) 143400a2430fSAndrzej Pietrasiewicz { 143500a2430fSAndrzej Pietrasiewicz ENTER(); 143600a2430fSAndrzej Pietrasiewicz 143700a2430fSAndrzej Pietrasiewicz kill_litter_super(sb); 143800a2430fSAndrzej Pietrasiewicz if (sb->s_fs_info) { 143900a2430fSAndrzej Pietrasiewicz ffs_release_dev(sb->s_fs_info); 144018d6b32fSRobert Baldyga ffs_data_closed(sb->s_fs_info); 144100a2430fSAndrzej Pietrasiewicz ffs_data_put(sb->s_fs_info); 144200a2430fSAndrzej Pietrasiewicz } 144300a2430fSAndrzej Pietrasiewicz } 144400a2430fSAndrzej Pietrasiewicz 144500a2430fSAndrzej Pietrasiewicz static struct file_system_type ffs_fs_type = { 144600a2430fSAndrzej Pietrasiewicz .owner = THIS_MODULE, 144700a2430fSAndrzej Pietrasiewicz .name = "functionfs", 144800a2430fSAndrzej Pietrasiewicz .mount = ffs_fs_mount, 144900a2430fSAndrzej Pietrasiewicz .kill_sb = ffs_fs_kill_sb, 145000a2430fSAndrzej Pietrasiewicz }; 145100a2430fSAndrzej Pietrasiewicz MODULE_ALIAS_FS("functionfs"); 145200a2430fSAndrzej Pietrasiewicz 145300a2430fSAndrzej Pietrasiewicz 145400a2430fSAndrzej Pietrasiewicz /* Driver's main init/cleanup functions *************************************/ 145500a2430fSAndrzej Pietrasiewicz 145600a2430fSAndrzej Pietrasiewicz static int functionfs_init(void) 145700a2430fSAndrzej Pietrasiewicz { 145800a2430fSAndrzej Pietrasiewicz int ret; 145900a2430fSAndrzej Pietrasiewicz 146000a2430fSAndrzej Pietrasiewicz ENTER(); 146100a2430fSAndrzej Pietrasiewicz 146200a2430fSAndrzej Pietrasiewicz ret = register_filesystem(&ffs_fs_type); 146300a2430fSAndrzej Pietrasiewicz if (likely(!ret)) 146400a2430fSAndrzej Pietrasiewicz pr_info("file system registered\n"); 146500a2430fSAndrzej Pietrasiewicz else 146600a2430fSAndrzej Pietrasiewicz pr_err("failed registering file system (%d)\n", ret); 146700a2430fSAndrzej Pietrasiewicz 146800a2430fSAndrzej Pietrasiewicz return ret; 146900a2430fSAndrzej Pietrasiewicz } 147000a2430fSAndrzej Pietrasiewicz 147100a2430fSAndrzej Pietrasiewicz static void functionfs_cleanup(void) 147200a2430fSAndrzej Pietrasiewicz { 147300a2430fSAndrzej Pietrasiewicz ENTER(); 147400a2430fSAndrzej Pietrasiewicz 147500a2430fSAndrzej Pietrasiewicz pr_info("unloading\n"); 147600a2430fSAndrzej Pietrasiewicz unregister_filesystem(&ffs_fs_type); 147700a2430fSAndrzej Pietrasiewicz } 147800a2430fSAndrzej Pietrasiewicz 147900a2430fSAndrzej Pietrasiewicz 148000a2430fSAndrzej Pietrasiewicz /* ffs_data and ffs_function construction and destruction code **************/ 148100a2430fSAndrzej Pietrasiewicz 148200a2430fSAndrzej Pietrasiewicz static void ffs_data_clear(struct ffs_data *ffs); 148300a2430fSAndrzej Pietrasiewicz static void ffs_data_reset(struct ffs_data *ffs); 148400a2430fSAndrzej Pietrasiewicz 148500a2430fSAndrzej Pietrasiewicz static void ffs_data_get(struct ffs_data *ffs) 148600a2430fSAndrzej Pietrasiewicz { 148700a2430fSAndrzej Pietrasiewicz ENTER(); 148800a2430fSAndrzej Pietrasiewicz 148900a2430fSAndrzej Pietrasiewicz atomic_inc(&ffs->ref); 149000a2430fSAndrzej Pietrasiewicz } 149100a2430fSAndrzej Pietrasiewicz 149200a2430fSAndrzej Pietrasiewicz static void ffs_data_opened(struct ffs_data *ffs) 149300a2430fSAndrzej Pietrasiewicz { 149400a2430fSAndrzej Pietrasiewicz ENTER(); 149500a2430fSAndrzej Pietrasiewicz 149600a2430fSAndrzej Pietrasiewicz atomic_inc(&ffs->ref); 149718d6b32fSRobert Baldyga if (atomic_add_return(1, &ffs->opened) == 1 && 149818d6b32fSRobert Baldyga ffs->state == FFS_DEACTIVATED) { 149918d6b32fSRobert Baldyga ffs->state = FFS_CLOSING; 150018d6b32fSRobert Baldyga ffs_data_reset(ffs); 150118d6b32fSRobert Baldyga } 150200a2430fSAndrzej Pietrasiewicz } 150300a2430fSAndrzej Pietrasiewicz 150400a2430fSAndrzej Pietrasiewicz static void ffs_data_put(struct ffs_data *ffs) 150500a2430fSAndrzej Pietrasiewicz { 150600a2430fSAndrzej Pietrasiewicz ENTER(); 150700a2430fSAndrzej Pietrasiewicz 150800a2430fSAndrzej Pietrasiewicz if (unlikely(atomic_dec_and_test(&ffs->ref))) { 150900a2430fSAndrzej Pietrasiewicz pr_info("%s(): freeing\n", __func__); 151000a2430fSAndrzej Pietrasiewicz ffs_data_clear(ffs); 151100a2430fSAndrzej Pietrasiewicz BUG_ON(waitqueue_active(&ffs->ev.waitq) || 151200a2430fSAndrzej Pietrasiewicz waitqueue_active(&ffs->ep0req_completion.wait)); 151300a2430fSAndrzej Pietrasiewicz kfree(ffs->dev_name); 151400a2430fSAndrzej Pietrasiewicz kfree(ffs); 151500a2430fSAndrzej Pietrasiewicz } 151600a2430fSAndrzej Pietrasiewicz } 151700a2430fSAndrzej Pietrasiewicz 151800a2430fSAndrzej Pietrasiewicz static void ffs_data_closed(struct ffs_data *ffs) 151900a2430fSAndrzej Pietrasiewicz { 152000a2430fSAndrzej Pietrasiewicz ENTER(); 152100a2430fSAndrzej Pietrasiewicz 152200a2430fSAndrzej Pietrasiewicz if (atomic_dec_and_test(&ffs->opened)) { 152318d6b32fSRobert Baldyga if (ffs->no_disconnect) { 152418d6b32fSRobert Baldyga ffs->state = FFS_DEACTIVATED; 152518d6b32fSRobert Baldyga if (ffs->epfiles) { 152618d6b32fSRobert Baldyga ffs_epfiles_destroy(ffs->epfiles, 152718d6b32fSRobert Baldyga ffs->eps_count); 152818d6b32fSRobert Baldyga ffs->epfiles = NULL; 152918d6b32fSRobert Baldyga } 153018d6b32fSRobert Baldyga if (ffs->setup_state == FFS_SETUP_PENDING) 153118d6b32fSRobert Baldyga __ffs_ep0_stall(ffs); 153218d6b32fSRobert Baldyga } else { 153318d6b32fSRobert Baldyga ffs->state = FFS_CLOSING; 153418d6b32fSRobert Baldyga ffs_data_reset(ffs); 153518d6b32fSRobert Baldyga } 153618d6b32fSRobert Baldyga } 153718d6b32fSRobert Baldyga if (atomic_read(&ffs->opened) < 0) { 153800a2430fSAndrzej Pietrasiewicz ffs->state = FFS_CLOSING; 153900a2430fSAndrzej Pietrasiewicz ffs_data_reset(ffs); 154000a2430fSAndrzej Pietrasiewicz } 154100a2430fSAndrzej Pietrasiewicz 154200a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 154300a2430fSAndrzej Pietrasiewicz } 154400a2430fSAndrzej Pietrasiewicz 154500a2430fSAndrzej Pietrasiewicz static struct ffs_data *ffs_data_new(void) 154600a2430fSAndrzej Pietrasiewicz { 154700a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); 154800a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs)) 154900a2430fSAndrzej Pietrasiewicz return NULL; 155000a2430fSAndrzej Pietrasiewicz 155100a2430fSAndrzej Pietrasiewicz ENTER(); 155200a2430fSAndrzej Pietrasiewicz 155300a2430fSAndrzej Pietrasiewicz atomic_set(&ffs->ref, 1); 155400a2430fSAndrzej Pietrasiewicz atomic_set(&ffs->opened, 0); 155500a2430fSAndrzej Pietrasiewicz ffs->state = FFS_READ_DESCRIPTORS; 155600a2430fSAndrzej Pietrasiewicz mutex_init(&ffs->mutex); 155700a2430fSAndrzej Pietrasiewicz spin_lock_init(&ffs->eps_lock); 155800a2430fSAndrzej Pietrasiewicz init_waitqueue_head(&ffs->ev.waitq); 155900a2430fSAndrzej Pietrasiewicz init_completion(&ffs->ep0req_completion); 156000a2430fSAndrzej Pietrasiewicz 156100a2430fSAndrzej Pietrasiewicz /* XXX REVISIT need to update it in some places, or do we? */ 156200a2430fSAndrzej Pietrasiewicz ffs->ev.can_stall = 1; 156300a2430fSAndrzej Pietrasiewicz 156400a2430fSAndrzej Pietrasiewicz return ffs; 156500a2430fSAndrzej Pietrasiewicz } 156600a2430fSAndrzej Pietrasiewicz 156700a2430fSAndrzej Pietrasiewicz static void ffs_data_clear(struct ffs_data *ffs) 156800a2430fSAndrzej Pietrasiewicz { 156900a2430fSAndrzej Pietrasiewicz ENTER(); 157000a2430fSAndrzej Pietrasiewicz 157100a2430fSAndrzej Pietrasiewicz ffs_closed(ffs); 157200a2430fSAndrzej Pietrasiewicz 157300a2430fSAndrzej Pietrasiewicz BUG_ON(ffs->gadget); 157400a2430fSAndrzej Pietrasiewicz 157500a2430fSAndrzej Pietrasiewicz if (ffs->epfiles) 157600a2430fSAndrzej Pietrasiewicz ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); 157700a2430fSAndrzej Pietrasiewicz 15785e33f6fdSRobert Baldyga if (ffs->ffs_eventfd) 15795e33f6fdSRobert Baldyga eventfd_ctx_put(ffs->ffs_eventfd); 15805e33f6fdSRobert Baldyga 158100a2430fSAndrzej Pietrasiewicz kfree(ffs->raw_descs_data); 158200a2430fSAndrzej Pietrasiewicz kfree(ffs->raw_strings); 158300a2430fSAndrzej Pietrasiewicz kfree(ffs->stringtabs); 158400a2430fSAndrzej Pietrasiewicz } 158500a2430fSAndrzej Pietrasiewicz 158600a2430fSAndrzej Pietrasiewicz static void ffs_data_reset(struct ffs_data *ffs) 158700a2430fSAndrzej Pietrasiewicz { 158800a2430fSAndrzej Pietrasiewicz ENTER(); 158900a2430fSAndrzej Pietrasiewicz 159000a2430fSAndrzej Pietrasiewicz ffs_data_clear(ffs); 159100a2430fSAndrzej Pietrasiewicz 159200a2430fSAndrzej Pietrasiewicz ffs->epfiles = NULL; 159300a2430fSAndrzej Pietrasiewicz ffs->raw_descs_data = NULL; 159400a2430fSAndrzej Pietrasiewicz ffs->raw_descs = NULL; 159500a2430fSAndrzej Pietrasiewicz ffs->raw_strings = NULL; 159600a2430fSAndrzej Pietrasiewicz ffs->stringtabs = NULL; 159700a2430fSAndrzej Pietrasiewicz 159800a2430fSAndrzej Pietrasiewicz ffs->raw_descs_length = 0; 159900a2430fSAndrzej Pietrasiewicz ffs->fs_descs_count = 0; 160000a2430fSAndrzej Pietrasiewicz ffs->hs_descs_count = 0; 160100a2430fSAndrzej Pietrasiewicz ffs->ss_descs_count = 0; 160200a2430fSAndrzej Pietrasiewicz 160300a2430fSAndrzej Pietrasiewicz ffs->strings_count = 0; 160400a2430fSAndrzej Pietrasiewicz ffs->interfaces_count = 0; 160500a2430fSAndrzej Pietrasiewicz ffs->eps_count = 0; 160600a2430fSAndrzej Pietrasiewicz 160700a2430fSAndrzej Pietrasiewicz ffs->ev.count = 0; 160800a2430fSAndrzej Pietrasiewicz 160900a2430fSAndrzej Pietrasiewicz ffs->state = FFS_READ_DESCRIPTORS; 161000a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_NO_SETUP; 161100a2430fSAndrzej Pietrasiewicz ffs->flags = 0; 161200a2430fSAndrzej Pietrasiewicz } 161300a2430fSAndrzej Pietrasiewicz 161400a2430fSAndrzej Pietrasiewicz 161500a2430fSAndrzej Pietrasiewicz static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) 161600a2430fSAndrzej Pietrasiewicz { 161700a2430fSAndrzej Pietrasiewicz struct usb_gadget_strings **lang; 161800a2430fSAndrzej Pietrasiewicz int first_id; 161900a2430fSAndrzej Pietrasiewicz 162000a2430fSAndrzej Pietrasiewicz ENTER(); 162100a2430fSAndrzej Pietrasiewicz 162200a2430fSAndrzej Pietrasiewicz if (WARN_ON(ffs->state != FFS_ACTIVE 162300a2430fSAndrzej Pietrasiewicz || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) 162400a2430fSAndrzej Pietrasiewicz return -EBADFD; 162500a2430fSAndrzej Pietrasiewicz 162600a2430fSAndrzej Pietrasiewicz first_id = usb_string_ids_n(cdev, ffs->strings_count); 162700a2430fSAndrzej Pietrasiewicz if (unlikely(first_id < 0)) 162800a2430fSAndrzej Pietrasiewicz return first_id; 162900a2430fSAndrzej Pietrasiewicz 163000a2430fSAndrzej Pietrasiewicz ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 163100a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs->ep0req)) 163200a2430fSAndrzej Pietrasiewicz return -ENOMEM; 163300a2430fSAndrzej Pietrasiewicz ffs->ep0req->complete = ffs_ep0_complete; 163400a2430fSAndrzej Pietrasiewicz ffs->ep0req->context = ffs; 163500a2430fSAndrzej Pietrasiewicz 163600a2430fSAndrzej Pietrasiewicz lang = ffs->stringtabs; 163761fe2d75SGreg Kroah-Hartman if (lang) { 163861fe2d75SGreg Kroah-Hartman for (; *lang; ++lang) { 163900a2430fSAndrzej Pietrasiewicz struct usb_string *str = (*lang)->strings; 164000a2430fSAndrzej Pietrasiewicz int id = first_id; 164100a2430fSAndrzej Pietrasiewicz for (; str->s; ++id, ++str) 164200a2430fSAndrzej Pietrasiewicz str->id = id; 164300a2430fSAndrzej Pietrasiewicz } 164461fe2d75SGreg Kroah-Hartman } 164500a2430fSAndrzej Pietrasiewicz 164600a2430fSAndrzej Pietrasiewicz ffs->gadget = cdev->gadget; 164700a2430fSAndrzej Pietrasiewicz ffs_data_get(ffs); 164800a2430fSAndrzej Pietrasiewicz return 0; 164900a2430fSAndrzej Pietrasiewicz } 165000a2430fSAndrzej Pietrasiewicz 165100a2430fSAndrzej Pietrasiewicz static void functionfs_unbind(struct ffs_data *ffs) 165200a2430fSAndrzej Pietrasiewicz { 165300a2430fSAndrzej Pietrasiewicz ENTER(); 165400a2430fSAndrzej Pietrasiewicz 165500a2430fSAndrzej Pietrasiewicz if (!WARN_ON(!ffs->gadget)) { 165600a2430fSAndrzej Pietrasiewicz usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); 165700a2430fSAndrzej Pietrasiewicz ffs->ep0req = NULL; 165800a2430fSAndrzej Pietrasiewicz ffs->gadget = NULL; 165900a2430fSAndrzej Pietrasiewicz clear_bit(FFS_FL_BOUND, &ffs->flags); 166000a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 166100a2430fSAndrzej Pietrasiewicz } 166200a2430fSAndrzej Pietrasiewicz } 166300a2430fSAndrzej Pietrasiewicz 166400a2430fSAndrzej Pietrasiewicz static int ffs_epfiles_create(struct ffs_data *ffs) 166500a2430fSAndrzej Pietrasiewicz { 166600a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile, *epfiles; 166700a2430fSAndrzej Pietrasiewicz unsigned i, count; 166800a2430fSAndrzej Pietrasiewicz 166900a2430fSAndrzej Pietrasiewicz ENTER(); 167000a2430fSAndrzej Pietrasiewicz 167100a2430fSAndrzej Pietrasiewicz count = ffs->eps_count; 167200a2430fSAndrzej Pietrasiewicz epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); 167300a2430fSAndrzej Pietrasiewicz if (!epfiles) 167400a2430fSAndrzej Pietrasiewicz return -ENOMEM; 167500a2430fSAndrzej Pietrasiewicz 167600a2430fSAndrzej Pietrasiewicz epfile = epfiles; 167700a2430fSAndrzej Pietrasiewicz for (i = 1; i <= count; ++i, ++epfile) { 167800a2430fSAndrzej Pietrasiewicz epfile->ffs = ffs; 167900a2430fSAndrzej Pietrasiewicz mutex_init(&epfile->mutex); 168000a2430fSAndrzej Pietrasiewicz init_waitqueue_head(&epfile->wait); 16811b0bf88fSRobert Baldyga if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) 1682acba23feSMario Schuknecht sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]); 16831b0bf88fSRobert Baldyga else 1684acba23feSMario Schuknecht sprintf(epfile->name, "ep%u", i); 1685acba23feSMario Schuknecht epfile->dentry = ffs_sb_create_file(ffs->sb, epfile->name, 16861bb27cacSAl Viro epfile, 16871bb27cacSAl Viro &ffs_epfile_operations); 16881bb27cacSAl Viro if (unlikely(!epfile->dentry)) { 168900a2430fSAndrzej Pietrasiewicz ffs_epfiles_destroy(epfiles, i - 1); 169000a2430fSAndrzej Pietrasiewicz return -ENOMEM; 169100a2430fSAndrzej Pietrasiewicz } 169200a2430fSAndrzej Pietrasiewicz } 169300a2430fSAndrzej Pietrasiewicz 169400a2430fSAndrzej Pietrasiewicz ffs->epfiles = epfiles; 169500a2430fSAndrzej Pietrasiewicz return 0; 169600a2430fSAndrzej Pietrasiewicz } 169700a2430fSAndrzej Pietrasiewicz 169800a2430fSAndrzej Pietrasiewicz static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) 169900a2430fSAndrzej Pietrasiewicz { 170000a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = epfiles; 170100a2430fSAndrzej Pietrasiewicz 170200a2430fSAndrzej Pietrasiewicz ENTER(); 170300a2430fSAndrzej Pietrasiewicz 170400a2430fSAndrzej Pietrasiewicz for (; count; --count, ++epfile) { 170500a2430fSAndrzej Pietrasiewicz BUG_ON(mutex_is_locked(&epfile->mutex) || 170600a2430fSAndrzej Pietrasiewicz waitqueue_active(&epfile->wait)); 170700a2430fSAndrzej Pietrasiewicz if (epfile->dentry) { 170800a2430fSAndrzej Pietrasiewicz d_delete(epfile->dentry); 170900a2430fSAndrzej Pietrasiewicz dput(epfile->dentry); 171000a2430fSAndrzej Pietrasiewicz epfile->dentry = NULL; 171100a2430fSAndrzej Pietrasiewicz } 171200a2430fSAndrzej Pietrasiewicz } 171300a2430fSAndrzej Pietrasiewicz 171400a2430fSAndrzej Pietrasiewicz kfree(epfiles); 171500a2430fSAndrzej Pietrasiewicz } 171600a2430fSAndrzej Pietrasiewicz 171700a2430fSAndrzej Pietrasiewicz static void ffs_func_eps_disable(struct ffs_function *func) 171800a2430fSAndrzej Pietrasiewicz { 171900a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = func->eps; 172000a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = func->ffs->epfiles; 172100a2430fSAndrzej Pietrasiewicz unsigned count = func->ffs->eps_count; 172200a2430fSAndrzej Pietrasiewicz unsigned long flags; 172300a2430fSAndrzej Pietrasiewicz 172400a2430fSAndrzej Pietrasiewicz do { 17259353afbbSMichal Nazarewicz if (epfile) 17269353afbbSMichal Nazarewicz mutex_lock(&epfile->mutex); 17279353afbbSMichal Nazarewicz spin_lock_irqsave(&func->ffs->eps_lock, flags); 172800a2430fSAndrzej Pietrasiewicz /* pending requests get nuked */ 172900a2430fSAndrzej Pietrasiewicz if (likely(ep->ep)) 173000a2430fSAndrzej Pietrasiewicz usb_ep_disable(ep->ep); 173100a2430fSAndrzej Pietrasiewicz ++ep; 17329353afbbSMichal Nazarewicz spin_unlock_irqrestore(&func->ffs->eps_lock, flags); 173318d6b32fSRobert Baldyga 173418d6b32fSRobert Baldyga if (epfile) { 173518d6b32fSRobert Baldyga epfile->ep = NULL; 17369353afbbSMichal Nazarewicz kfree(epfile->read_buffer); 17379353afbbSMichal Nazarewicz epfile->read_buffer = NULL; 17389353afbbSMichal Nazarewicz mutex_unlock(&epfile->mutex); 173900a2430fSAndrzej Pietrasiewicz ++epfile; 174018d6b32fSRobert Baldyga } 174100a2430fSAndrzej Pietrasiewicz } while (--count); 174200a2430fSAndrzej Pietrasiewicz } 174300a2430fSAndrzej Pietrasiewicz 174400a2430fSAndrzej Pietrasiewicz static int ffs_func_eps_enable(struct ffs_function *func) 174500a2430fSAndrzej Pietrasiewicz { 174600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 174700a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = func->eps; 174800a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = ffs->epfiles; 174900a2430fSAndrzej Pietrasiewicz unsigned count = ffs->eps_count; 175000a2430fSAndrzej Pietrasiewicz unsigned long flags; 175100a2430fSAndrzej Pietrasiewicz int ret = 0; 175200a2430fSAndrzej Pietrasiewicz 175300a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&func->ffs->eps_lock, flags); 175400a2430fSAndrzej Pietrasiewicz do { 175500a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *ds; 175600a2430fSAndrzej Pietrasiewicz int desc_idx; 175700a2430fSAndrzej Pietrasiewicz 175800a2430fSAndrzej Pietrasiewicz if (ffs->gadget->speed == USB_SPEED_SUPER) 175900a2430fSAndrzej Pietrasiewicz desc_idx = 2; 176000a2430fSAndrzej Pietrasiewicz else if (ffs->gadget->speed == USB_SPEED_HIGH) 176100a2430fSAndrzej Pietrasiewicz desc_idx = 1; 176200a2430fSAndrzej Pietrasiewicz else 176300a2430fSAndrzej Pietrasiewicz desc_idx = 0; 176400a2430fSAndrzej Pietrasiewicz 176500a2430fSAndrzej Pietrasiewicz /* fall-back to lower speed if desc missing for current speed */ 176600a2430fSAndrzej Pietrasiewicz do { 176700a2430fSAndrzej Pietrasiewicz ds = ep->descs[desc_idx]; 176800a2430fSAndrzej Pietrasiewicz } while (!ds && --desc_idx >= 0); 176900a2430fSAndrzej Pietrasiewicz 177000a2430fSAndrzej Pietrasiewicz if (!ds) { 177100a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 177200a2430fSAndrzej Pietrasiewicz break; 177300a2430fSAndrzej Pietrasiewicz } 177400a2430fSAndrzej Pietrasiewicz 177500a2430fSAndrzej Pietrasiewicz ep->ep->driver_data = ep; 177600a2430fSAndrzej Pietrasiewicz ep->ep->desc = ds; 177700a2430fSAndrzej Pietrasiewicz ret = usb_ep_enable(ep->ep); 177800a2430fSAndrzej Pietrasiewicz if (likely(!ret)) { 177900a2430fSAndrzej Pietrasiewicz epfile->ep = ep; 178000a2430fSAndrzej Pietrasiewicz epfile->in = usb_endpoint_dir_in(ds); 178100a2430fSAndrzej Pietrasiewicz epfile->isoc = usb_endpoint_xfer_isoc(ds); 178200a2430fSAndrzej Pietrasiewicz } else { 178300a2430fSAndrzej Pietrasiewicz break; 178400a2430fSAndrzej Pietrasiewicz } 178500a2430fSAndrzej Pietrasiewicz 178600a2430fSAndrzej Pietrasiewicz wake_up(&epfile->wait); 178700a2430fSAndrzej Pietrasiewicz 178800a2430fSAndrzej Pietrasiewicz ++ep; 178900a2430fSAndrzej Pietrasiewicz ++epfile; 179000a2430fSAndrzej Pietrasiewicz } while (--count); 179100a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&func->ffs->eps_lock, flags); 179200a2430fSAndrzej Pietrasiewicz 179300a2430fSAndrzej Pietrasiewicz return ret; 179400a2430fSAndrzej Pietrasiewicz } 179500a2430fSAndrzej Pietrasiewicz 179600a2430fSAndrzej Pietrasiewicz 179700a2430fSAndrzej Pietrasiewicz /* Parsing and building descriptors and strings *****************************/ 179800a2430fSAndrzej Pietrasiewicz 179900a2430fSAndrzej Pietrasiewicz /* 180000a2430fSAndrzej Pietrasiewicz * This validates if data pointed by data is a valid USB descriptor as 180100a2430fSAndrzej Pietrasiewicz * well as record how many interfaces, endpoints and strings are 180200a2430fSAndrzej Pietrasiewicz * required by given configuration. Returns address after the 180300a2430fSAndrzej Pietrasiewicz * descriptor or NULL if data is invalid. 180400a2430fSAndrzej Pietrasiewicz */ 180500a2430fSAndrzej Pietrasiewicz 180600a2430fSAndrzej Pietrasiewicz enum ffs_entity_type { 180700a2430fSAndrzej Pietrasiewicz FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT 180800a2430fSAndrzej Pietrasiewicz }; 180900a2430fSAndrzej Pietrasiewicz 181000a2430fSAndrzej Pietrasiewicz enum ffs_os_desc_type { 181100a2430fSAndrzej Pietrasiewicz FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP 181200a2430fSAndrzej Pietrasiewicz }; 181300a2430fSAndrzej Pietrasiewicz 181400a2430fSAndrzej Pietrasiewicz typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, 181500a2430fSAndrzej Pietrasiewicz u8 *valuep, 181600a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *desc, 181700a2430fSAndrzej Pietrasiewicz void *priv); 181800a2430fSAndrzej Pietrasiewicz 181900a2430fSAndrzej Pietrasiewicz typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, 182000a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h, void *data, 182100a2430fSAndrzej Pietrasiewicz unsigned len, void *priv); 182200a2430fSAndrzej Pietrasiewicz 182300a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_single_desc(char *data, unsigned len, 182400a2430fSAndrzej Pietrasiewicz ffs_entity_callback entity, 182500a2430fSAndrzej Pietrasiewicz void *priv) 182600a2430fSAndrzej Pietrasiewicz { 182700a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *_ds = (void *)data; 182800a2430fSAndrzej Pietrasiewicz u8 length; 182900a2430fSAndrzej Pietrasiewicz int ret; 183000a2430fSAndrzej Pietrasiewicz 183100a2430fSAndrzej Pietrasiewicz ENTER(); 183200a2430fSAndrzej Pietrasiewicz 183300a2430fSAndrzej Pietrasiewicz /* At least two bytes are required: length and type */ 183400a2430fSAndrzej Pietrasiewicz if (len < 2) { 183500a2430fSAndrzej Pietrasiewicz pr_vdebug("descriptor too short\n"); 183600a2430fSAndrzej Pietrasiewicz return -EINVAL; 183700a2430fSAndrzej Pietrasiewicz } 183800a2430fSAndrzej Pietrasiewicz 183900a2430fSAndrzej Pietrasiewicz /* If we have at least as many bytes as the descriptor takes? */ 184000a2430fSAndrzej Pietrasiewicz length = _ds->bLength; 184100a2430fSAndrzej Pietrasiewicz if (len < length) { 184200a2430fSAndrzej Pietrasiewicz pr_vdebug("descriptor longer then available data\n"); 184300a2430fSAndrzej Pietrasiewicz return -EINVAL; 184400a2430fSAndrzej Pietrasiewicz } 184500a2430fSAndrzej Pietrasiewicz 184600a2430fSAndrzej Pietrasiewicz #define __entity_check_INTERFACE(val) 1 184700a2430fSAndrzej Pietrasiewicz #define __entity_check_STRING(val) (val) 184800a2430fSAndrzej Pietrasiewicz #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) 184900a2430fSAndrzej Pietrasiewicz #define __entity(type, val) do { \ 185000a2430fSAndrzej Pietrasiewicz pr_vdebug("entity " #type "(%02x)\n", (val)); \ 185100a2430fSAndrzej Pietrasiewicz if (unlikely(!__entity_check_ ##type(val))) { \ 185200a2430fSAndrzej Pietrasiewicz pr_vdebug("invalid entity's value\n"); \ 185300a2430fSAndrzej Pietrasiewicz return -EINVAL; \ 185400a2430fSAndrzej Pietrasiewicz } \ 185500a2430fSAndrzej Pietrasiewicz ret = entity(FFS_ ##type, &val, _ds, priv); \ 185600a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { \ 185700a2430fSAndrzej Pietrasiewicz pr_debug("entity " #type "(%02x); ret = %d\n", \ 185800a2430fSAndrzej Pietrasiewicz (val), ret); \ 185900a2430fSAndrzej Pietrasiewicz return ret; \ 186000a2430fSAndrzej Pietrasiewicz } \ 186100a2430fSAndrzej Pietrasiewicz } while (0) 186200a2430fSAndrzej Pietrasiewicz 186300a2430fSAndrzej Pietrasiewicz /* Parse descriptor depending on type. */ 186400a2430fSAndrzej Pietrasiewicz switch (_ds->bDescriptorType) { 186500a2430fSAndrzej Pietrasiewicz case USB_DT_DEVICE: 186600a2430fSAndrzej Pietrasiewicz case USB_DT_CONFIG: 186700a2430fSAndrzej Pietrasiewicz case USB_DT_STRING: 186800a2430fSAndrzej Pietrasiewicz case USB_DT_DEVICE_QUALIFIER: 186900a2430fSAndrzej Pietrasiewicz /* function can't have any of those */ 187000a2430fSAndrzej Pietrasiewicz pr_vdebug("descriptor reserved for gadget: %d\n", 187100a2430fSAndrzej Pietrasiewicz _ds->bDescriptorType); 187200a2430fSAndrzej Pietrasiewicz return -EINVAL; 187300a2430fSAndrzej Pietrasiewicz 187400a2430fSAndrzej Pietrasiewicz case USB_DT_INTERFACE: { 187500a2430fSAndrzej Pietrasiewicz struct usb_interface_descriptor *ds = (void *)_ds; 187600a2430fSAndrzej Pietrasiewicz pr_vdebug("interface descriptor\n"); 187700a2430fSAndrzej Pietrasiewicz if (length != sizeof *ds) 187800a2430fSAndrzej Pietrasiewicz goto inv_length; 187900a2430fSAndrzej Pietrasiewicz 188000a2430fSAndrzej Pietrasiewicz __entity(INTERFACE, ds->bInterfaceNumber); 188100a2430fSAndrzej Pietrasiewicz if (ds->iInterface) 188200a2430fSAndrzej Pietrasiewicz __entity(STRING, ds->iInterface); 188300a2430fSAndrzej Pietrasiewicz } 188400a2430fSAndrzej Pietrasiewicz break; 188500a2430fSAndrzej Pietrasiewicz 188600a2430fSAndrzej Pietrasiewicz case USB_DT_ENDPOINT: { 188700a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *ds = (void *)_ds; 188800a2430fSAndrzej Pietrasiewicz pr_vdebug("endpoint descriptor\n"); 188900a2430fSAndrzej Pietrasiewicz if (length != USB_DT_ENDPOINT_SIZE && 189000a2430fSAndrzej Pietrasiewicz length != USB_DT_ENDPOINT_AUDIO_SIZE) 189100a2430fSAndrzej Pietrasiewicz goto inv_length; 189200a2430fSAndrzej Pietrasiewicz __entity(ENDPOINT, ds->bEndpointAddress); 189300a2430fSAndrzej Pietrasiewicz } 189400a2430fSAndrzej Pietrasiewicz break; 189500a2430fSAndrzej Pietrasiewicz 189600a2430fSAndrzej Pietrasiewicz case HID_DT_HID: 189700a2430fSAndrzej Pietrasiewicz pr_vdebug("hid descriptor\n"); 189800a2430fSAndrzej Pietrasiewicz if (length != sizeof(struct hid_descriptor)) 189900a2430fSAndrzej Pietrasiewicz goto inv_length; 190000a2430fSAndrzej Pietrasiewicz break; 190100a2430fSAndrzej Pietrasiewicz 190200a2430fSAndrzej Pietrasiewicz case USB_DT_OTG: 190300a2430fSAndrzej Pietrasiewicz if (length != sizeof(struct usb_otg_descriptor)) 190400a2430fSAndrzej Pietrasiewicz goto inv_length; 190500a2430fSAndrzej Pietrasiewicz break; 190600a2430fSAndrzej Pietrasiewicz 190700a2430fSAndrzej Pietrasiewicz case USB_DT_INTERFACE_ASSOCIATION: { 190800a2430fSAndrzej Pietrasiewicz struct usb_interface_assoc_descriptor *ds = (void *)_ds; 190900a2430fSAndrzej Pietrasiewicz pr_vdebug("interface association descriptor\n"); 191000a2430fSAndrzej Pietrasiewicz if (length != sizeof *ds) 191100a2430fSAndrzej Pietrasiewicz goto inv_length; 191200a2430fSAndrzej Pietrasiewicz if (ds->iFunction) 191300a2430fSAndrzej Pietrasiewicz __entity(STRING, ds->iFunction); 191400a2430fSAndrzej Pietrasiewicz } 191500a2430fSAndrzej Pietrasiewicz break; 191600a2430fSAndrzej Pietrasiewicz 191700a2430fSAndrzej Pietrasiewicz case USB_DT_SS_ENDPOINT_COMP: 191800a2430fSAndrzej Pietrasiewicz pr_vdebug("EP SS companion descriptor\n"); 191900a2430fSAndrzej Pietrasiewicz if (length != sizeof(struct usb_ss_ep_comp_descriptor)) 192000a2430fSAndrzej Pietrasiewicz goto inv_length; 192100a2430fSAndrzej Pietrasiewicz break; 192200a2430fSAndrzej Pietrasiewicz 192300a2430fSAndrzej Pietrasiewicz case USB_DT_OTHER_SPEED_CONFIG: 192400a2430fSAndrzej Pietrasiewicz case USB_DT_INTERFACE_POWER: 192500a2430fSAndrzej Pietrasiewicz case USB_DT_DEBUG: 192600a2430fSAndrzej Pietrasiewicz case USB_DT_SECURITY: 192700a2430fSAndrzej Pietrasiewicz case USB_DT_CS_RADIO_CONTROL: 192800a2430fSAndrzej Pietrasiewicz /* TODO */ 192900a2430fSAndrzej Pietrasiewicz pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); 193000a2430fSAndrzej Pietrasiewicz return -EINVAL; 193100a2430fSAndrzej Pietrasiewicz 193200a2430fSAndrzej Pietrasiewicz default: 193300a2430fSAndrzej Pietrasiewicz /* We should never be here */ 193400a2430fSAndrzej Pietrasiewicz pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); 193500a2430fSAndrzej Pietrasiewicz return -EINVAL; 193600a2430fSAndrzej Pietrasiewicz 193700a2430fSAndrzej Pietrasiewicz inv_length: 193800a2430fSAndrzej Pietrasiewicz pr_vdebug("invalid length: %d (descriptor %d)\n", 193900a2430fSAndrzej Pietrasiewicz _ds->bLength, _ds->bDescriptorType); 194000a2430fSAndrzej Pietrasiewicz return -EINVAL; 194100a2430fSAndrzej Pietrasiewicz } 194200a2430fSAndrzej Pietrasiewicz 194300a2430fSAndrzej Pietrasiewicz #undef __entity 194400a2430fSAndrzej Pietrasiewicz #undef __entity_check_DESCRIPTOR 194500a2430fSAndrzej Pietrasiewicz #undef __entity_check_INTERFACE 194600a2430fSAndrzej Pietrasiewicz #undef __entity_check_STRING 194700a2430fSAndrzej Pietrasiewicz #undef __entity_check_ENDPOINT 194800a2430fSAndrzej Pietrasiewicz 194900a2430fSAndrzej Pietrasiewicz return length; 195000a2430fSAndrzej Pietrasiewicz } 195100a2430fSAndrzej Pietrasiewicz 195200a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, 195300a2430fSAndrzej Pietrasiewicz ffs_entity_callback entity, void *priv) 195400a2430fSAndrzej Pietrasiewicz { 195500a2430fSAndrzej Pietrasiewicz const unsigned _len = len; 195600a2430fSAndrzej Pietrasiewicz unsigned long num = 0; 195700a2430fSAndrzej Pietrasiewicz 195800a2430fSAndrzej Pietrasiewicz ENTER(); 195900a2430fSAndrzej Pietrasiewicz 196000a2430fSAndrzej Pietrasiewicz for (;;) { 196100a2430fSAndrzej Pietrasiewicz int ret; 196200a2430fSAndrzej Pietrasiewicz 196300a2430fSAndrzej Pietrasiewicz if (num == count) 196400a2430fSAndrzej Pietrasiewicz data = NULL; 196500a2430fSAndrzej Pietrasiewicz 196600a2430fSAndrzej Pietrasiewicz /* Record "descriptor" entity */ 196700a2430fSAndrzej Pietrasiewicz ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); 196800a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 196900a2430fSAndrzej Pietrasiewicz pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", 197000a2430fSAndrzej Pietrasiewicz num, ret); 197100a2430fSAndrzej Pietrasiewicz return ret; 197200a2430fSAndrzej Pietrasiewicz } 197300a2430fSAndrzej Pietrasiewicz 197400a2430fSAndrzej Pietrasiewicz if (!data) 197500a2430fSAndrzej Pietrasiewicz return _len - len; 197600a2430fSAndrzej Pietrasiewicz 197700a2430fSAndrzej Pietrasiewicz ret = ffs_do_single_desc(data, len, entity, priv); 197800a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 197900a2430fSAndrzej Pietrasiewicz pr_debug("%s returns %d\n", __func__, ret); 198000a2430fSAndrzej Pietrasiewicz return ret; 198100a2430fSAndrzej Pietrasiewicz } 198200a2430fSAndrzej Pietrasiewicz 198300a2430fSAndrzej Pietrasiewicz len -= ret; 198400a2430fSAndrzej Pietrasiewicz data += ret; 198500a2430fSAndrzej Pietrasiewicz ++num; 198600a2430fSAndrzej Pietrasiewicz } 198700a2430fSAndrzej Pietrasiewicz } 198800a2430fSAndrzej Pietrasiewicz 198900a2430fSAndrzej Pietrasiewicz static int __ffs_data_do_entity(enum ffs_entity_type type, 199000a2430fSAndrzej Pietrasiewicz u8 *valuep, struct usb_descriptor_header *desc, 199100a2430fSAndrzej Pietrasiewicz void *priv) 199200a2430fSAndrzej Pietrasiewicz { 19936d5c1c77SRobert Baldyga struct ffs_desc_helper *helper = priv; 19946d5c1c77SRobert Baldyga struct usb_endpoint_descriptor *d; 199500a2430fSAndrzej Pietrasiewicz 199600a2430fSAndrzej Pietrasiewicz ENTER(); 199700a2430fSAndrzej Pietrasiewicz 199800a2430fSAndrzej Pietrasiewicz switch (type) { 199900a2430fSAndrzej Pietrasiewicz case FFS_DESCRIPTOR: 200000a2430fSAndrzej Pietrasiewicz break; 200100a2430fSAndrzej Pietrasiewicz 200200a2430fSAndrzej Pietrasiewicz case FFS_INTERFACE: 200300a2430fSAndrzej Pietrasiewicz /* 200400a2430fSAndrzej Pietrasiewicz * Interfaces are indexed from zero so if we 200500a2430fSAndrzej Pietrasiewicz * encountered interface "n" then there are at least 200600a2430fSAndrzej Pietrasiewicz * "n+1" interfaces. 200700a2430fSAndrzej Pietrasiewicz */ 20086d5c1c77SRobert Baldyga if (*valuep >= helper->interfaces_count) 20096d5c1c77SRobert Baldyga helper->interfaces_count = *valuep + 1; 201000a2430fSAndrzej Pietrasiewicz break; 201100a2430fSAndrzej Pietrasiewicz 201200a2430fSAndrzej Pietrasiewicz case FFS_STRING: 201300a2430fSAndrzej Pietrasiewicz /* 201400a2430fSAndrzej Pietrasiewicz * Strings are indexed from 1 (0 is magic ;) reserved 201500a2430fSAndrzej Pietrasiewicz * for languages list or some such) 201600a2430fSAndrzej Pietrasiewicz */ 20176d5c1c77SRobert Baldyga if (*valuep > helper->ffs->strings_count) 20186d5c1c77SRobert Baldyga helper->ffs->strings_count = *valuep; 201900a2430fSAndrzej Pietrasiewicz break; 202000a2430fSAndrzej Pietrasiewicz 202100a2430fSAndrzej Pietrasiewicz case FFS_ENDPOINT: 20226d5c1c77SRobert Baldyga d = (void *)desc; 20236d5c1c77SRobert Baldyga helper->eps_count++; 20246d5c1c77SRobert Baldyga if (helper->eps_count >= 15) 20256d5c1c77SRobert Baldyga return -EINVAL; 20266d5c1c77SRobert Baldyga /* Check if descriptors for any speed were already parsed */ 20276d5c1c77SRobert Baldyga if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) 20286d5c1c77SRobert Baldyga helper->ffs->eps_addrmap[helper->eps_count] = 20296d5c1c77SRobert Baldyga d->bEndpointAddress; 20306d5c1c77SRobert Baldyga else if (helper->ffs->eps_addrmap[helper->eps_count] != 20316d5c1c77SRobert Baldyga d->bEndpointAddress) 20326d5c1c77SRobert Baldyga return -EINVAL; 203300a2430fSAndrzej Pietrasiewicz break; 203400a2430fSAndrzej Pietrasiewicz } 203500a2430fSAndrzej Pietrasiewicz 203600a2430fSAndrzej Pietrasiewicz return 0; 203700a2430fSAndrzej Pietrasiewicz } 203800a2430fSAndrzej Pietrasiewicz 203900a2430fSAndrzej Pietrasiewicz static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, 204000a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *desc) 204100a2430fSAndrzej Pietrasiewicz { 204200a2430fSAndrzej Pietrasiewicz u16 bcd_version = le16_to_cpu(desc->bcdVersion); 204300a2430fSAndrzej Pietrasiewicz u16 w_index = le16_to_cpu(desc->wIndex); 204400a2430fSAndrzej Pietrasiewicz 204500a2430fSAndrzej Pietrasiewicz if (bcd_version != 1) { 204600a2430fSAndrzej Pietrasiewicz pr_vdebug("unsupported os descriptors version: %d", 204700a2430fSAndrzej Pietrasiewicz bcd_version); 204800a2430fSAndrzej Pietrasiewicz return -EINVAL; 204900a2430fSAndrzej Pietrasiewicz } 205000a2430fSAndrzej Pietrasiewicz switch (w_index) { 205100a2430fSAndrzej Pietrasiewicz case 0x4: 205200a2430fSAndrzej Pietrasiewicz *next_type = FFS_OS_DESC_EXT_COMPAT; 205300a2430fSAndrzej Pietrasiewicz break; 205400a2430fSAndrzej Pietrasiewicz case 0x5: 205500a2430fSAndrzej Pietrasiewicz *next_type = FFS_OS_DESC_EXT_PROP; 205600a2430fSAndrzej Pietrasiewicz break; 205700a2430fSAndrzej Pietrasiewicz default: 205800a2430fSAndrzej Pietrasiewicz pr_vdebug("unsupported os descriptor type: %d", w_index); 205900a2430fSAndrzej Pietrasiewicz return -EINVAL; 206000a2430fSAndrzej Pietrasiewicz } 206100a2430fSAndrzej Pietrasiewicz 206200a2430fSAndrzej Pietrasiewicz return sizeof(*desc); 206300a2430fSAndrzej Pietrasiewicz } 206400a2430fSAndrzej Pietrasiewicz 206500a2430fSAndrzej Pietrasiewicz /* 206600a2430fSAndrzej Pietrasiewicz * Process all extended compatibility/extended property descriptors 206700a2430fSAndrzej Pietrasiewicz * of a feature descriptor 206800a2430fSAndrzej Pietrasiewicz */ 206900a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_single_os_desc(char *data, unsigned len, 207000a2430fSAndrzej Pietrasiewicz enum ffs_os_desc_type type, 207100a2430fSAndrzej Pietrasiewicz u16 feature_count, 207200a2430fSAndrzej Pietrasiewicz ffs_os_desc_callback entity, 207300a2430fSAndrzej Pietrasiewicz void *priv, 207400a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h) 207500a2430fSAndrzej Pietrasiewicz { 207600a2430fSAndrzej Pietrasiewicz int ret; 207700a2430fSAndrzej Pietrasiewicz const unsigned _len = len; 207800a2430fSAndrzej Pietrasiewicz 207900a2430fSAndrzej Pietrasiewicz ENTER(); 208000a2430fSAndrzej Pietrasiewicz 208100a2430fSAndrzej Pietrasiewicz /* loop over all ext compat/ext prop descriptors */ 208200a2430fSAndrzej Pietrasiewicz while (feature_count--) { 208300a2430fSAndrzej Pietrasiewicz ret = entity(type, h, data, len, priv); 208400a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 208500a2430fSAndrzej Pietrasiewicz pr_debug("bad OS descriptor, type: %d\n", type); 208600a2430fSAndrzej Pietrasiewicz return ret; 208700a2430fSAndrzej Pietrasiewicz } 208800a2430fSAndrzej Pietrasiewicz data += ret; 208900a2430fSAndrzej Pietrasiewicz len -= ret; 209000a2430fSAndrzej Pietrasiewicz } 209100a2430fSAndrzej Pietrasiewicz return _len - len; 209200a2430fSAndrzej Pietrasiewicz } 209300a2430fSAndrzej Pietrasiewicz 209400a2430fSAndrzej Pietrasiewicz /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ 209500a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_os_descs(unsigned count, 209600a2430fSAndrzej Pietrasiewicz char *data, unsigned len, 209700a2430fSAndrzej Pietrasiewicz ffs_os_desc_callback entity, void *priv) 209800a2430fSAndrzej Pietrasiewicz { 209900a2430fSAndrzej Pietrasiewicz const unsigned _len = len; 210000a2430fSAndrzej Pietrasiewicz unsigned long num = 0; 210100a2430fSAndrzej Pietrasiewicz 210200a2430fSAndrzej Pietrasiewicz ENTER(); 210300a2430fSAndrzej Pietrasiewicz 210400a2430fSAndrzej Pietrasiewicz for (num = 0; num < count; ++num) { 210500a2430fSAndrzej Pietrasiewicz int ret; 210600a2430fSAndrzej Pietrasiewicz enum ffs_os_desc_type type; 210700a2430fSAndrzej Pietrasiewicz u16 feature_count; 210800a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *desc = (void *)data; 210900a2430fSAndrzej Pietrasiewicz 211000a2430fSAndrzej Pietrasiewicz if (len < sizeof(*desc)) 211100a2430fSAndrzej Pietrasiewicz return -EINVAL; 211200a2430fSAndrzej Pietrasiewicz 211300a2430fSAndrzej Pietrasiewicz /* 211400a2430fSAndrzej Pietrasiewicz * Record "descriptor" entity. 211500a2430fSAndrzej Pietrasiewicz * Process dwLength, bcdVersion, wIndex, get b/wCount. 211600a2430fSAndrzej Pietrasiewicz * Move the data pointer to the beginning of extended 211700a2430fSAndrzej Pietrasiewicz * compatibilities proper or extended properties proper 211800a2430fSAndrzej Pietrasiewicz * portions of the data 211900a2430fSAndrzej Pietrasiewicz */ 212000a2430fSAndrzej Pietrasiewicz if (le32_to_cpu(desc->dwLength) > len) 212100a2430fSAndrzej Pietrasiewicz return -EINVAL; 212200a2430fSAndrzej Pietrasiewicz 212300a2430fSAndrzej Pietrasiewicz ret = __ffs_do_os_desc_header(&type, desc); 212400a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 212500a2430fSAndrzej Pietrasiewicz pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", 212600a2430fSAndrzej Pietrasiewicz num, ret); 212700a2430fSAndrzej Pietrasiewicz return ret; 212800a2430fSAndrzej Pietrasiewicz } 212900a2430fSAndrzej Pietrasiewicz /* 213000a2430fSAndrzej Pietrasiewicz * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" 213100a2430fSAndrzej Pietrasiewicz */ 213200a2430fSAndrzej Pietrasiewicz feature_count = le16_to_cpu(desc->wCount); 213300a2430fSAndrzej Pietrasiewicz if (type == FFS_OS_DESC_EXT_COMPAT && 213400a2430fSAndrzej Pietrasiewicz (feature_count > 255 || desc->Reserved)) 213500a2430fSAndrzej Pietrasiewicz return -EINVAL; 213600a2430fSAndrzej Pietrasiewicz len -= ret; 213700a2430fSAndrzej Pietrasiewicz data += ret; 213800a2430fSAndrzej Pietrasiewicz 213900a2430fSAndrzej Pietrasiewicz /* 214000a2430fSAndrzej Pietrasiewicz * Process all function/property descriptors 214100a2430fSAndrzej Pietrasiewicz * of this Feature Descriptor 214200a2430fSAndrzej Pietrasiewicz */ 214300a2430fSAndrzej Pietrasiewicz ret = ffs_do_single_os_desc(data, len, type, 214400a2430fSAndrzej Pietrasiewicz feature_count, entity, priv, desc); 214500a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 214600a2430fSAndrzej Pietrasiewicz pr_debug("%s returns %d\n", __func__, ret); 214700a2430fSAndrzej Pietrasiewicz return ret; 214800a2430fSAndrzej Pietrasiewicz } 214900a2430fSAndrzej Pietrasiewicz 215000a2430fSAndrzej Pietrasiewicz len -= ret; 215100a2430fSAndrzej Pietrasiewicz data += ret; 215200a2430fSAndrzej Pietrasiewicz } 215300a2430fSAndrzej Pietrasiewicz return _len - len; 215400a2430fSAndrzej Pietrasiewicz } 215500a2430fSAndrzej Pietrasiewicz 215600a2430fSAndrzej Pietrasiewicz /** 215700a2430fSAndrzej Pietrasiewicz * Validate contents of the buffer from userspace related to OS descriptors. 215800a2430fSAndrzej Pietrasiewicz */ 215900a2430fSAndrzej Pietrasiewicz static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, 216000a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h, void *data, 216100a2430fSAndrzej Pietrasiewicz unsigned len, void *priv) 216200a2430fSAndrzej Pietrasiewicz { 216300a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = priv; 216400a2430fSAndrzej Pietrasiewicz u8 length; 216500a2430fSAndrzej Pietrasiewicz 216600a2430fSAndrzej Pietrasiewicz ENTER(); 216700a2430fSAndrzej Pietrasiewicz 216800a2430fSAndrzej Pietrasiewicz switch (type) { 216900a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_COMPAT: { 217000a2430fSAndrzej Pietrasiewicz struct usb_ext_compat_desc *d = data; 217100a2430fSAndrzej Pietrasiewicz int i; 217200a2430fSAndrzej Pietrasiewicz 217300a2430fSAndrzej Pietrasiewicz if (len < sizeof(*d) || 217400a2430fSAndrzej Pietrasiewicz d->bFirstInterfaceNumber >= ffs->interfaces_count || 217553642399SJim Lin !d->Reserved1) 217600a2430fSAndrzej Pietrasiewicz return -EINVAL; 217700a2430fSAndrzej Pietrasiewicz for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) 217800a2430fSAndrzej Pietrasiewicz if (d->Reserved2[i]) 217900a2430fSAndrzej Pietrasiewicz return -EINVAL; 218000a2430fSAndrzej Pietrasiewicz 218100a2430fSAndrzej Pietrasiewicz length = sizeof(struct usb_ext_compat_desc); 218200a2430fSAndrzej Pietrasiewicz } 218300a2430fSAndrzej Pietrasiewicz break; 218400a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_PROP: { 218500a2430fSAndrzej Pietrasiewicz struct usb_ext_prop_desc *d = data; 218600a2430fSAndrzej Pietrasiewicz u32 type, pdl; 218700a2430fSAndrzej Pietrasiewicz u16 pnl; 218800a2430fSAndrzej Pietrasiewicz 218900a2430fSAndrzej Pietrasiewicz if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) 219000a2430fSAndrzej Pietrasiewicz return -EINVAL; 219100a2430fSAndrzej Pietrasiewicz length = le32_to_cpu(d->dwSize); 219200a2430fSAndrzej Pietrasiewicz type = le32_to_cpu(d->dwPropertyDataType); 219300a2430fSAndrzej Pietrasiewicz if (type < USB_EXT_PROP_UNICODE || 219400a2430fSAndrzej Pietrasiewicz type > USB_EXT_PROP_UNICODE_MULTI) { 219500a2430fSAndrzej Pietrasiewicz pr_vdebug("unsupported os descriptor property type: %d", 219600a2430fSAndrzej Pietrasiewicz type); 219700a2430fSAndrzej Pietrasiewicz return -EINVAL; 219800a2430fSAndrzej Pietrasiewicz } 219900a2430fSAndrzej Pietrasiewicz pnl = le16_to_cpu(d->wPropertyNameLength); 220000a2430fSAndrzej Pietrasiewicz pdl = le32_to_cpu(*(u32 *)((u8 *)data + 10 + pnl)); 220100a2430fSAndrzej Pietrasiewicz if (length != 14 + pnl + pdl) { 220200a2430fSAndrzej Pietrasiewicz pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", 220300a2430fSAndrzej Pietrasiewicz length, pnl, pdl, type); 220400a2430fSAndrzej Pietrasiewicz return -EINVAL; 220500a2430fSAndrzej Pietrasiewicz } 220600a2430fSAndrzej Pietrasiewicz ++ffs->ms_os_descs_ext_prop_count; 220700a2430fSAndrzej Pietrasiewicz /* property name reported to the host as "WCHAR"s */ 220800a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_name_len += pnl * 2; 220900a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_data_len += pdl; 221000a2430fSAndrzej Pietrasiewicz } 221100a2430fSAndrzej Pietrasiewicz break; 221200a2430fSAndrzej Pietrasiewicz default: 221300a2430fSAndrzej Pietrasiewicz pr_vdebug("unknown descriptor: %d\n", type); 221400a2430fSAndrzej Pietrasiewicz return -EINVAL; 221500a2430fSAndrzej Pietrasiewicz } 221600a2430fSAndrzej Pietrasiewicz return length; 221700a2430fSAndrzej Pietrasiewicz } 221800a2430fSAndrzej Pietrasiewicz 221900a2430fSAndrzej Pietrasiewicz static int __ffs_data_got_descs(struct ffs_data *ffs, 222000a2430fSAndrzej Pietrasiewicz char *const _data, size_t len) 222100a2430fSAndrzej Pietrasiewicz { 222200a2430fSAndrzej Pietrasiewicz char *data = _data, *raw_descs; 222300a2430fSAndrzej Pietrasiewicz unsigned os_descs_count = 0, counts[3], flags; 222400a2430fSAndrzej Pietrasiewicz int ret = -EINVAL, i; 22256d5c1c77SRobert Baldyga struct ffs_desc_helper helper; 222600a2430fSAndrzej Pietrasiewicz 222700a2430fSAndrzej Pietrasiewicz ENTER(); 222800a2430fSAndrzej Pietrasiewicz 222900a2430fSAndrzej Pietrasiewicz if (get_unaligned_le32(data + 4) != len) 223000a2430fSAndrzej Pietrasiewicz goto error; 223100a2430fSAndrzej Pietrasiewicz 223200a2430fSAndrzej Pietrasiewicz switch (get_unaligned_le32(data)) { 223300a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_DESCRIPTORS_MAGIC: 223400a2430fSAndrzej Pietrasiewicz flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; 223500a2430fSAndrzej Pietrasiewicz data += 8; 223600a2430fSAndrzej Pietrasiewicz len -= 8; 223700a2430fSAndrzej Pietrasiewicz break; 223800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: 223900a2430fSAndrzej Pietrasiewicz flags = get_unaligned_le32(data + 8); 22401b0bf88fSRobert Baldyga ffs->user_flags = flags; 224100a2430fSAndrzej Pietrasiewicz if (flags & ~(FUNCTIONFS_HAS_FS_DESC | 224200a2430fSAndrzej Pietrasiewicz FUNCTIONFS_HAS_HS_DESC | 224300a2430fSAndrzej Pietrasiewicz FUNCTIONFS_HAS_SS_DESC | 22441b0bf88fSRobert Baldyga FUNCTIONFS_HAS_MS_OS_DESC | 22455e33f6fdSRobert Baldyga FUNCTIONFS_VIRTUAL_ADDR | 22465e33f6fdSRobert Baldyga FUNCTIONFS_EVENTFD)) { 224700a2430fSAndrzej Pietrasiewicz ret = -ENOSYS; 224800a2430fSAndrzej Pietrasiewicz goto error; 224900a2430fSAndrzej Pietrasiewicz } 225000a2430fSAndrzej Pietrasiewicz data += 12; 225100a2430fSAndrzej Pietrasiewicz len -= 12; 225200a2430fSAndrzej Pietrasiewicz break; 225300a2430fSAndrzej Pietrasiewicz default: 225400a2430fSAndrzej Pietrasiewicz goto error; 225500a2430fSAndrzej Pietrasiewicz } 225600a2430fSAndrzej Pietrasiewicz 22575e33f6fdSRobert Baldyga if (flags & FUNCTIONFS_EVENTFD) { 22585e33f6fdSRobert Baldyga if (len < 4) 22595e33f6fdSRobert Baldyga goto error; 22605e33f6fdSRobert Baldyga ffs->ffs_eventfd = 22615e33f6fdSRobert Baldyga eventfd_ctx_fdget((int)get_unaligned_le32(data)); 22625e33f6fdSRobert Baldyga if (IS_ERR(ffs->ffs_eventfd)) { 22635e33f6fdSRobert Baldyga ret = PTR_ERR(ffs->ffs_eventfd); 22645e33f6fdSRobert Baldyga ffs->ffs_eventfd = NULL; 22655e33f6fdSRobert Baldyga goto error; 22665e33f6fdSRobert Baldyga } 22675e33f6fdSRobert Baldyga data += 4; 22685e33f6fdSRobert Baldyga len -= 4; 22695e33f6fdSRobert Baldyga } 22705e33f6fdSRobert Baldyga 227100a2430fSAndrzej Pietrasiewicz /* Read fs_count, hs_count and ss_count (if present) */ 227200a2430fSAndrzej Pietrasiewicz for (i = 0; i < 3; ++i) { 227300a2430fSAndrzej Pietrasiewicz if (!(flags & (1 << i))) { 227400a2430fSAndrzej Pietrasiewicz counts[i] = 0; 227500a2430fSAndrzej Pietrasiewicz } else if (len < 4) { 227600a2430fSAndrzej Pietrasiewicz goto error; 227700a2430fSAndrzej Pietrasiewicz } else { 227800a2430fSAndrzej Pietrasiewicz counts[i] = get_unaligned_le32(data); 227900a2430fSAndrzej Pietrasiewicz data += 4; 228000a2430fSAndrzej Pietrasiewicz len -= 4; 228100a2430fSAndrzej Pietrasiewicz } 228200a2430fSAndrzej Pietrasiewicz } 228300a2430fSAndrzej Pietrasiewicz if (flags & (1 << i)) { 228400a2430fSAndrzej Pietrasiewicz os_descs_count = get_unaligned_le32(data); 228500a2430fSAndrzej Pietrasiewicz data += 4; 228600a2430fSAndrzej Pietrasiewicz len -= 4; 228700a2430fSAndrzej Pietrasiewicz }; 228800a2430fSAndrzej Pietrasiewicz 228900a2430fSAndrzej Pietrasiewicz /* Read descriptors */ 229000a2430fSAndrzej Pietrasiewicz raw_descs = data; 22916d5c1c77SRobert Baldyga helper.ffs = ffs; 229200a2430fSAndrzej Pietrasiewicz for (i = 0; i < 3; ++i) { 229300a2430fSAndrzej Pietrasiewicz if (!counts[i]) 229400a2430fSAndrzej Pietrasiewicz continue; 22956d5c1c77SRobert Baldyga helper.interfaces_count = 0; 22966d5c1c77SRobert Baldyga helper.eps_count = 0; 229700a2430fSAndrzej Pietrasiewicz ret = ffs_do_descs(counts[i], data, len, 22986d5c1c77SRobert Baldyga __ffs_data_do_entity, &helper); 229900a2430fSAndrzej Pietrasiewicz if (ret < 0) 230000a2430fSAndrzej Pietrasiewicz goto error; 23016d5c1c77SRobert Baldyga if (!ffs->eps_count && !ffs->interfaces_count) { 23026d5c1c77SRobert Baldyga ffs->eps_count = helper.eps_count; 23036d5c1c77SRobert Baldyga ffs->interfaces_count = helper.interfaces_count; 23046d5c1c77SRobert Baldyga } else { 23056d5c1c77SRobert Baldyga if (ffs->eps_count != helper.eps_count) { 23066d5c1c77SRobert Baldyga ret = -EINVAL; 23076d5c1c77SRobert Baldyga goto error; 23086d5c1c77SRobert Baldyga } 23096d5c1c77SRobert Baldyga if (ffs->interfaces_count != helper.interfaces_count) { 23106d5c1c77SRobert Baldyga ret = -EINVAL; 23116d5c1c77SRobert Baldyga goto error; 23126d5c1c77SRobert Baldyga } 23136d5c1c77SRobert Baldyga } 231400a2430fSAndrzej Pietrasiewicz data += ret; 231500a2430fSAndrzej Pietrasiewicz len -= ret; 231600a2430fSAndrzej Pietrasiewicz } 231700a2430fSAndrzej Pietrasiewicz if (os_descs_count) { 231800a2430fSAndrzej Pietrasiewicz ret = ffs_do_os_descs(os_descs_count, data, len, 231900a2430fSAndrzej Pietrasiewicz __ffs_data_do_os_desc, ffs); 232000a2430fSAndrzej Pietrasiewicz if (ret < 0) 232100a2430fSAndrzej Pietrasiewicz goto error; 232200a2430fSAndrzej Pietrasiewicz data += ret; 232300a2430fSAndrzej Pietrasiewicz len -= ret; 232400a2430fSAndrzej Pietrasiewicz } 232500a2430fSAndrzej Pietrasiewicz 232600a2430fSAndrzej Pietrasiewicz if (raw_descs == data || len) { 232700a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 232800a2430fSAndrzej Pietrasiewicz goto error; 232900a2430fSAndrzej Pietrasiewicz } 233000a2430fSAndrzej Pietrasiewicz 233100a2430fSAndrzej Pietrasiewicz ffs->raw_descs_data = _data; 233200a2430fSAndrzej Pietrasiewicz ffs->raw_descs = raw_descs; 233300a2430fSAndrzej Pietrasiewicz ffs->raw_descs_length = data - raw_descs; 233400a2430fSAndrzej Pietrasiewicz ffs->fs_descs_count = counts[0]; 233500a2430fSAndrzej Pietrasiewicz ffs->hs_descs_count = counts[1]; 233600a2430fSAndrzej Pietrasiewicz ffs->ss_descs_count = counts[2]; 233700a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_count = os_descs_count; 233800a2430fSAndrzej Pietrasiewicz 233900a2430fSAndrzej Pietrasiewicz return 0; 234000a2430fSAndrzej Pietrasiewicz 234100a2430fSAndrzej Pietrasiewicz error: 234200a2430fSAndrzej Pietrasiewicz kfree(_data); 234300a2430fSAndrzej Pietrasiewicz return ret; 234400a2430fSAndrzej Pietrasiewicz } 234500a2430fSAndrzej Pietrasiewicz 234600a2430fSAndrzej Pietrasiewicz static int __ffs_data_got_strings(struct ffs_data *ffs, 234700a2430fSAndrzej Pietrasiewicz char *const _data, size_t len) 234800a2430fSAndrzej Pietrasiewicz { 234900a2430fSAndrzej Pietrasiewicz u32 str_count, needed_count, lang_count; 235000a2430fSAndrzej Pietrasiewicz struct usb_gadget_strings **stringtabs, *t; 235100a2430fSAndrzej Pietrasiewicz const char *data = _data; 2352872ce511SMichal Nazarewicz struct usb_string *s; 235300a2430fSAndrzej Pietrasiewicz 235400a2430fSAndrzej Pietrasiewicz ENTER(); 235500a2430fSAndrzej Pietrasiewicz 235600a2430fSAndrzej Pietrasiewicz if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || 235700a2430fSAndrzej Pietrasiewicz get_unaligned_le32(data + 4) != len)) 235800a2430fSAndrzej Pietrasiewicz goto error; 235900a2430fSAndrzej Pietrasiewicz str_count = get_unaligned_le32(data + 8); 236000a2430fSAndrzej Pietrasiewicz lang_count = get_unaligned_le32(data + 12); 236100a2430fSAndrzej Pietrasiewicz 236200a2430fSAndrzej Pietrasiewicz /* if one is zero the other must be zero */ 236300a2430fSAndrzej Pietrasiewicz if (unlikely(!str_count != !lang_count)) 236400a2430fSAndrzej Pietrasiewicz goto error; 236500a2430fSAndrzej Pietrasiewicz 236600a2430fSAndrzej Pietrasiewicz /* Do we have at least as many strings as descriptors need? */ 236700a2430fSAndrzej Pietrasiewicz needed_count = ffs->strings_count; 236800a2430fSAndrzej Pietrasiewicz if (unlikely(str_count < needed_count)) 236900a2430fSAndrzej Pietrasiewicz goto error; 237000a2430fSAndrzej Pietrasiewicz 237100a2430fSAndrzej Pietrasiewicz /* 237200a2430fSAndrzej Pietrasiewicz * If we don't need any strings just return and free all 237300a2430fSAndrzej Pietrasiewicz * memory. 237400a2430fSAndrzej Pietrasiewicz */ 237500a2430fSAndrzej Pietrasiewicz if (!needed_count) { 237600a2430fSAndrzej Pietrasiewicz kfree(_data); 237700a2430fSAndrzej Pietrasiewicz return 0; 237800a2430fSAndrzej Pietrasiewicz } 237900a2430fSAndrzej Pietrasiewicz 238000a2430fSAndrzej Pietrasiewicz /* Allocate everything in one chunk so there's less maintenance. */ 238100a2430fSAndrzej Pietrasiewicz { 238200a2430fSAndrzej Pietrasiewicz unsigned i = 0; 238300a2430fSAndrzej Pietrasiewicz vla_group(d); 238400a2430fSAndrzej Pietrasiewicz vla_item(d, struct usb_gadget_strings *, stringtabs, 238500a2430fSAndrzej Pietrasiewicz lang_count + 1); 238600a2430fSAndrzej Pietrasiewicz vla_item(d, struct usb_gadget_strings, stringtab, lang_count); 238700a2430fSAndrzej Pietrasiewicz vla_item(d, struct usb_string, strings, 238800a2430fSAndrzej Pietrasiewicz lang_count*(needed_count+1)); 238900a2430fSAndrzej Pietrasiewicz 239000a2430fSAndrzej Pietrasiewicz char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); 239100a2430fSAndrzej Pietrasiewicz 239200a2430fSAndrzej Pietrasiewicz if (unlikely(!vlabuf)) { 239300a2430fSAndrzej Pietrasiewicz kfree(_data); 239400a2430fSAndrzej Pietrasiewicz return -ENOMEM; 239500a2430fSAndrzej Pietrasiewicz } 239600a2430fSAndrzej Pietrasiewicz 239700a2430fSAndrzej Pietrasiewicz /* Initialize the VLA pointers */ 239800a2430fSAndrzej Pietrasiewicz stringtabs = vla_ptr(vlabuf, d, stringtabs); 239900a2430fSAndrzej Pietrasiewicz t = vla_ptr(vlabuf, d, stringtab); 240000a2430fSAndrzej Pietrasiewicz i = lang_count; 240100a2430fSAndrzej Pietrasiewicz do { 240200a2430fSAndrzej Pietrasiewicz *stringtabs++ = t++; 240300a2430fSAndrzej Pietrasiewicz } while (--i); 240400a2430fSAndrzej Pietrasiewicz *stringtabs = NULL; 240500a2430fSAndrzej Pietrasiewicz 240600a2430fSAndrzej Pietrasiewicz /* stringtabs = vlabuf = d_stringtabs for later kfree */ 240700a2430fSAndrzej Pietrasiewicz stringtabs = vla_ptr(vlabuf, d, stringtabs); 240800a2430fSAndrzej Pietrasiewicz t = vla_ptr(vlabuf, d, stringtab); 240900a2430fSAndrzej Pietrasiewicz s = vla_ptr(vlabuf, d, strings); 241000a2430fSAndrzej Pietrasiewicz } 241100a2430fSAndrzej Pietrasiewicz 241200a2430fSAndrzej Pietrasiewicz /* For each language */ 241300a2430fSAndrzej Pietrasiewicz data += 16; 241400a2430fSAndrzej Pietrasiewicz len -= 16; 241500a2430fSAndrzej Pietrasiewicz 241600a2430fSAndrzej Pietrasiewicz do { /* lang_count > 0 so we can use do-while */ 241700a2430fSAndrzej Pietrasiewicz unsigned needed = needed_count; 241800a2430fSAndrzej Pietrasiewicz 241900a2430fSAndrzej Pietrasiewicz if (unlikely(len < 3)) 242000a2430fSAndrzej Pietrasiewicz goto error_free; 242100a2430fSAndrzej Pietrasiewicz t->language = get_unaligned_le16(data); 242200a2430fSAndrzej Pietrasiewicz t->strings = s; 242300a2430fSAndrzej Pietrasiewicz ++t; 242400a2430fSAndrzej Pietrasiewicz 242500a2430fSAndrzej Pietrasiewicz data += 2; 242600a2430fSAndrzej Pietrasiewicz len -= 2; 242700a2430fSAndrzej Pietrasiewicz 242800a2430fSAndrzej Pietrasiewicz /* For each string */ 242900a2430fSAndrzej Pietrasiewicz do { /* str_count > 0 so we can use do-while */ 243000a2430fSAndrzej Pietrasiewicz size_t length = strnlen(data, len); 243100a2430fSAndrzej Pietrasiewicz 243200a2430fSAndrzej Pietrasiewicz if (unlikely(length == len)) 243300a2430fSAndrzej Pietrasiewicz goto error_free; 243400a2430fSAndrzej Pietrasiewicz 243500a2430fSAndrzej Pietrasiewicz /* 243600a2430fSAndrzej Pietrasiewicz * User may provide more strings then we need, 243700a2430fSAndrzej Pietrasiewicz * if that's the case we simply ignore the 243800a2430fSAndrzej Pietrasiewicz * rest 243900a2430fSAndrzej Pietrasiewicz */ 244000a2430fSAndrzej Pietrasiewicz if (likely(needed)) { 244100a2430fSAndrzej Pietrasiewicz /* 244200a2430fSAndrzej Pietrasiewicz * s->id will be set while adding 244300a2430fSAndrzej Pietrasiewicz * function to configuration so for 244400a2430fSAndrzej Pietrasiewicz * now just leave garbage here. 244500a2430fSAndrzej Pietrasiewicz */ 244600a2430fSAndrzej Pietrasiewicz s->s = data; 244700a2430fSAndrzej Pietrasiewicz --needed; 244800a2430fSAndrzej Pietrasiewicz ++s; 244900a2430fSAndrzej Pietrasiewicz } 245000a2430fSAndrzej Pietrasiewicz 245100a2430fSAndrzej Pietrasiewicz data += length + 1; 245200a2430fSAndrzej Pietrasiewicz len -= length + 1; 245300a2430fSAndrzej Pietrasiewicz } while (--str_count); 245400a2430fSAndrzej Pietrasiewicz 245500a2430fSAndrzej Pietrasiewicz s->id = 0; /* terminator */ 245600a2430fSAndrzej Pietrasiewicz s->s = NULL; 245700a2430fSAndrzej Pietrasiewicz ++s; 245800a2430fSAndrzej Pietrasiewicz 245900a2430fSAndrzej Pietrasiewicz } while (--lang_count); 246000a2430fSAndrzej Pietrasiewicz 246100a2430fSAndrzej Pietrasiewicz /* Some garbage left? */ 246200a2430fSAndrzej Pietrasiewicz if (unlikely(len)) 246300a2430fSAndrzej Pietrasiewicz goto error_free; 246400a2430fSAndrzej Pietrasiewicz 246500a2430fSAndrzej Pietrasiewicz /* Done! */ 246600a2430fSAndrzej Pietrasiewicz ffs->stringtabs = stringtabs; 246700a2430fSAndrzej Pietrasiewicz ffs->raw_strings = _data; 246800a2430fSAndrzej Pietrasiewicz 246900a2430fSAndrzej Pietrasiewicz return 0; 247000a2430fSAndrzej Pietrasiewicz 247100a2430fSAndrzej Pietrasiewicz error_free: 247200a2430fSAndrzej Pietrasiewicz kfree(stringtabs); 247300a2430fSAndrzej Pietrasiewicz error: 247400a2430fSAndrzej Pietrasiewicz kfree(_data); 247500a2430fSAndrzej Pietrasiewicz return -EINVAL; 247600a2430fSAndrzej Pietrasiewicz } 247700a2430fSAndrzej Pietrasiewicz 247800a2430fSAndrzej Pietrasiewicz 247900a2430fSAndrzej Pietrasiewicz /* Events handling and management *******************************************/ 248000a2430fSAndrzej Pietrasiewicz 248100a2430fSAndrzej Pietrasiewicz static void __ffs_event_add(struct ffs_data *ffs, 248200a2430fSAndrzej Pietrasiewicz enum usb_functionfs_event_type type) 248300a2430fSAndrzej Pietrasiewicz { 248400a2430fSAndrzej Pietrasiewicz enum usb_functionfs_event_type rem_type1, rem_type2 = type; 248500a2430fSAndrzej Pietrasiewicz int neg = 0; 248600a2430fSAndrzej Pietrasiewicz 248700a2430fSAndrzej Pietrasiewicz /* 248800a2430fSAndrzej Pietrasiewicz * Abort any unhandled setup 248900a2430fSAndrzej Pietrasiewicz * 249000a2430fSAndrzej Pietrasiewicz * We do not need to worry about some cmpxchg() changing value 249100a2430fSAndrzej Pietrasiewicz * of ffs->setup_state without holding the lock because when 249200a2430fSAndrzej Pietrasiewicz * state is FFS_SETUP_PENDING cmpxchg() in several places in 249300a2430fSAndrzej Pietrasiewicz * the source does nothing. 249400a2430fSAndrzej Pietrasiewicz */ 249500a2430fSAndrzej Pietrasiewicz if (ffs->setup_state == FFS_SETUP_PENDING) 249600a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_SETUP_CANCELLED; 249700a2430fSAndrzej Pietrasiewicz 249867913bbdSMichal Nazarewicz /* 249967913bbdSMichal Nazarewicz * Logic of this function guarantees that there are at most four pending 250067913bbdSMichal Nazarewicz * evens on ffs->ev.types queue. This is important because the queue 250167913bbdSMichal Nazarewicz * has space for four elements only and __ffs_ep0_read_events function 250267913bbdSMichal Nazarewicz * depends on that limit as well. If more event types are added, those 250367913bbdSMichal Nazarewicz * limits have to be revisited or guaranteed to still hold. 250467913bbdSMichal Nazarewicz */ 250500a2430fSAndrzej Pietrasiewicz switch (type) { 250600a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_RESUME: 250700a2430fSAndrzej Pietrasiewicz rem_type2 = FUNCTIONFS_SUSPEND; 250800a2430fSAndrzej Pietrasiewicz /* FALL THROUGH */ 250900a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_SUSPEND: 251000a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_SETUP: 251100a2430fSAndrzej Pietrasiewicz rem_type1 = type; 251200a2430fSAndrzej Pietrasiewicz /* Discard all similar events */ 251300a2430fSAndrzej Pietrasiewicz break; 251400a2430fSAndrzej Pietrasiewicz 251500a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_BIND: 251600a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_UNBIND: 251700a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_DISABLE: 251800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_ENABLE: 251900a2430fSAndrzej Pietrasiewicz /* Discard everything other then power management. */ 252000a2430fSAndrzej Pietrasiewicz rem_type1 = FUNCTIONFS_SUSPEND; 252100a2430fSAndrzej Pietrasiewicz rem_type2 = FUNCTIONFS_RESUME; 252200a2430fSAndrzej Pietrasiewicz neg = 1; 252300a2430fSAndrzej Pietrasiewicz break; 252400a2430fSAndrzej Pietrasiewicz 252500a2430fSAndrzej Pietrasiewicz default: 2526fe00bcbfSMichal Nazarewicz WARN(1, "%d: unknown event, this should not happen\n", type); 2527fe00bcbfSMichal Nazarewicz return; 252800a2430fSAndrzej Pietrasiewicz } 252900a2430fSAndrzej Pietrasiewicz 253000a2430fSAndrzej Pietrasiewicz { 253100a2430fSAndrzej Pietrasiewicz u8 *ev = ffs->ev.types, *out = ev; 253200a2430fSAndrzej Pietrasiewicz unsigned n = ffs->ev.count; 253300a2430fSAndrzej Pietrasiewicz for (; n; --n, ++ev) 253400a2430fSAndrzej Pietrasiewicz if ((*ev == rem_type1 || *ev == rem_type2) == neg) 253500a2430fSAndrzej Pietrasiewicz *out++ = *ev; 253600a2430fSAndrzej Pietrasiewicz else 253700a2430fSAndrzej Pietrasiewicz pr_vdebug("purging event %d\n", *ev); 253800a2430fSAndrzej Pietrasiewicz ffs->ev.count = out - ffs->ev.types; 253900a2430fSAndrzej Pietrasiewicz } 254000a2430fSAndrzej Pietrasiewicz 254100a2430fSAndrzej Pietrasiewicz pr_vdebug("adding event %d\n", type); 254200a2430fSAndrzej Pietrasiewicz ffs->ev.types[ffs->ev.count++] = type; 254300a2430fSAndrzej Pietrasiewicz wake_up_locked(&ffs->ev.waitq); 25445e33f6fdSRobert Baldyga if (ffs->ffs_eventfd) 25455e33f6fdSRobert Baldyga eventfd_signal(ffs->ffs_eventfd, 1); 254600a2430fSAndrzej Pietrasiewicz } 254700a2430fSAndrzej Pietrasiewicz 254800a2430fSAndrzej Pietrasiewicz static void ffs_event_add(struct ffs_data *ffs, 254900a2430fSAndrzej Pietrasiewicz enum usb_functionfs_event_type type) 255000a2430fSAndrzej Pietrasiewicz { 255100a2430fSAndrzej Pietrasiewicz unsigned long flags; 255200a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&ffs->ev.waitq.lock, flags); 255300a2430fSAndrzej Pietrasiewicz __ffs_event_add(ffs, type); 255400a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); 255500a2430fSAndrzej Pietrasiewicz } 255600a2430fSAndrzej Pietrasiewicz 255700a2430fSAndrzej Pietrasiewicz /* Bind/unbind USB function hooks *******************************************/ 255800a2430fSAndrzej Pietrasiewicz 25596d5c1c77SRobert Baldyga static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) 25606d5c1c77SRobert Baldyga { 25616d5c1c77SRobert Baldyga int i; 25626d5c1c77SRobert Baldyga 25636d5c1c77SRobert Baldyga for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) 25646d5c1c77SRobert Baldyga if (ffs->eps_addrmap[i] == endpoint_address) 25656d5c1c77SRobert Baldyga return i; 25666d5c1c77SRobert Baldyga return -ENOENT; 25676d5c1c77SRobert Baldyga } 25686d5c1c77SRobert Baldyga 256900a2430fSAndrzej Pietrasiewicz static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, 257000a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *desc, 257100a2430fSAndrzej Pietrasiewicz void *priv) 257200a2430fSAndrzej Pietrasiewicz { 257300a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *ds = (void *)desc; 257400a2430fSAndrzej Pietrasiewicz struct ffs_function *func = priv; 257500a2430fSAndrzej Pietrasiewicz struct ffs_ep *ffs_ep; 257685b06f5eSDan Carpenter unsigned ep_desc_id; 257785b06f5eSDan Carpenter int idx; 257800a2430fSAndrzej Pietrasiewicz static const char *speed_names[] = { "full", "high", "super" }; 257900a2430fSAndrzej Pietrasiewicz 258000a2430fSAndrzej Pietrasiewicz if (type != FFS_DESCRIPTOR) 258100a2430fSAndrzej Pietrasiewicz return 0; 258200a2430fSAndrzej Pietrasiewicz 258300a2430fSAndrzej Pietrasiewicz /* 258400a2430fSAndrzej Pietrasiewicz * If ss_descriptors is not NULL, we are reading super speed 258500a2430fSAndrzej Pietrasiewicz * descriptors; if hs_descriptors is not NULL, we are reading high 258600a2430fSAndrzej Pietrasiewicz * speed descriptors; otherwise, we are reading full speed 258700a2430fSAndrzej Pietrasiewicz * descriptors. 258800a2430fSAndrzej Pietrasiewicz */ 258900a2430fSAndrzej Pietrasiewicz if (func->function.ss_descriptors) { 259000a2430fSAndrzej Pietrasiewicz ep_desc_id = 2; 259100a2430fSAndrzej Pietrasiewicz func->function.ss_descriptors[(long)valuep] = desc; 259200a2430fSAndrzej Pietrasiewicz } else if (func->function.hs_descriptors) { 259300a2430fSAndrzej Pietrasiewicz ep_desc_id = 1; 259400a2430fSAndrzej Pietrasiewicz func->function.hs_descriptors[(long)valuep] = desc; 259500a2430fSAndrzej Pietrasiewicz } else { 259600a2430fSAndrzej Pietrasiewicz ep_desc_id = 0; 259700a2430fSAndrzej Pietrasiewicz func->function.fs_descriptors[(long)valuep] = desc; 259800a2430fSAndrzej Pietrasiewicz } 259900a2430fSAndrzej Pietrasiewicz 260000a2430fSAndrzej Pietrasiewicz if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) 260100a2430fSAndrzej Pietrasiewicz return 0; 260200a2430fSAndrzej Pietrasiewicz 26036d5c1c77SRobert Baldyga idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; 26046d5c1c77SRobert Baldyga if (idx < 0) 26056d5c1c77SRobert Baldyga return idx; 26066d5c1c77SRobert Baldyga 260700a2430fSAndrzej Pietrasiewicz ffs_ep = func->eps + idx; 260800a2430fSAndrzej Pietrasiewicz 260900a2430fSAndrzej Pietrasiewicz if (unlikely(ffs_ep->descs[ep_desc_id])) { 261000a2430fSAndrzej Pietrasiewicz pr_err("two %sspeed descriptors for EP %d\n", 261100a2430fSAndrzej Pietrasiewicz speed_names[ep_desc_id], 261200a2430fSAndrzej Pietrasiewicz ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 261300a2430fSAndrzej Pietrasiewicz return -EINVAL; 261400a2430fSAndrzej Pietrasiewicz } 261500a2430fSAndrzej Pietrasiewicz ffs_ep->descs[ep_desc_id] = ds; 261600a2430fSAndrzej Pietrasiewicz 261700a2430fSAndrzej Pietrasiewicz ffs_dump_mem(": Original ep desc", ds, ds->bLength); 261800a2430fSAndrzej Pietrasiewicz if (ffs_ep->ep) { 261900a2430fSAndrzej Pietrasiewicz ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; 262000a2430fSAndrzej Pietrasiewicz if (!ds->wMaxPacketSize) 262100a2430fSAndrzej Pietrasiewicz ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; 262200a2430fSAndrzej Pietrasiewicz } else { 262300a2430fSAndrzej Pietrasiewicz struct usb_request *req; 262400a2430fSAndrzej Pietrasiewicz struct usb_ep *ep; 26251b0bf88fSRobert Baldyga u8 bEndpointAddress; 262600a2430fSAndrzej Pietrasiewicz 26271b0bf88fSRobert Baldyga /* 26281b0bf88fSRobert Baldyga * We back up bEndpointAddress because autoconfig overwrites 26291b0bf88fSRobert Baldyga * it with physical endpoint address. 26301b0bf88fSRobert Baldyga */ 26311b0bf88fSRobert Baldyga bEndpointAddress = ds->bEndpointAddress; 263200a2430fSAndrzej Pietrasiewicz pr_vdebug("autoconfig\n"); 263300a2430fSAndrzej Pietrasiewicz ep = usb_ep_autoconfig(func->gadget, ds); 263400a2430fSAndrzej Pietrasiewicz if (unlikely(!ep)) 263500a2430fSAndrzej Pietrasiewicz return -ENOTSUPP; 263600a2430fSAndrzej Pietrasiewicz ep->driver_data = func->eps + idx; 263700a2430fSAndrzej Pietrasiewicz 263800a2430fSAndrzej Pietrasiewicz req = usb_ep_alloc_request(ep, GFP_KERNEL); 263900a2430fSAndrzej Pietrasiewicz if (unlikely(!req)) 264000a2430fSAndrzej Pietrasiewicz return -ENOMEM; 264100a2430fSAndrzej Pietrasiewicz 264200a2430fSAndrzej Pietrasiewicz ffs_ep->ep = ep; 264300a2430fSAndrzej Pietrasiewicz ffs_ep->req = req; 264400a2430fSAndrzej Pietrasiewicz func->eps_revmap[ds->bEndpointAddress & 264500a2430fSAndrzej Pietrasiewicz USB_ENDPOINT_NUMBER_MASK] = idx + 1; 26461b0bf88fSRobert Baldyga /* 26471b0bf88fSRobert Baldyga * If we use virtual address mapping, we restore 26481b0bf88fSRobert Baldyga * original bEndpointAddress value. 26491b0bf88fSRobert Baldyga */ 26501b0bf88fSRobert Baldyga if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) 26511b0bf88fSRobert Baldyga ds->bEndpointAddress = bEndpointAddress; 265200a2430fSAndrzej Pietrasiewicz } 265300a2430fSAndrzej Pietrasiewicz ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); 265400a2430fSAndrzej Pietrasiewicz 265500a2430fSAndrzej Pietrasiewicz return 0; 265600a2430fSAndrzej Pietrasiewicz } 265700a2430fSAndrzej Pietrasiewicz 265800a2430fSAndrzej Pietrasiewicz static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, 265900a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *desc, 266000a2430fSAndrzej Pietrasiewicz void *priv) 266100a2430fSAndrzej Pietrasiewicz { 266200a2430fSAndrzej Pietrasiewicz struct ffs_function *func = priv; 266300a2430fSAndrzej Pietrasiewicz unsigned idx; 266400a2430fSAndrzej Pietrasiewicz u8 newValue; 266500a2430fSAndrzej Pietrasiewicz 266600a2430fSAndrzej Pietrasiewicz switch (type) { 266700a2430fSAndrzej Pietrasiewicz default: 266800a2430fSAndrzej Pietrasiewicz case FFS_DESCRIPTOR: 266900a2430fSAndrzej Pietrasiewicz /* Handled in previous pass by __ffs_func_bind_do_descs() */ 267000a2430fSAndrzej Pietrasiewicz return 0; 267100a2430fSAndrzej Pietrasiewicz 267200a2430fSAndrzej Pietrasiewicz case FFS_INTERFACE: 267300a2430fSAndrzej Pietrasiewicz idx = *valuep; 267400a2430fSAndrzej Pietrasiewicz if (func->interfaces_nums[idx] < 0) { 267500a2430fSAndrzej Pietrasiewicz int id = usb_interface_id(func->conf, &func->function); 267600a2430fSAndrzej Pietrasiewicz if (unlikely(id < 0)) 267700a2430fSAndrzej Pietrasiewicz return id; 267800a2430fSAndrzej Pietrasiewicz func->interfaces_nums[idx] = id; 267900a2430fSAndrzej Pietrasiewicz } 268000a2430fSAndrzej Pietrasiewicz newValue = func->interfaces_nums[idx]; 268100a2430fSAndrzej Pietrasiewicz break; 268200a2430fSAndrzej Pietrasiewicz 268300a2430fSAndrzej Pietrasiewicz case FFS_STRING: 268400a2430fSAndrzej Pietrasiewicz /* String' IDs are allocated when fsf_data is bound to cdev */ 268500a2430fSAndrzej Pietrasiewicz newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; 268600a2430fSAndrzej Pietrasiewicz break; 268700a2430fSAndrzej Pietrasiewicz 268800a2430fSAndrzej Pietrasiewicz case FFS_ENDPOINT: 268900a2430fSAndrzej Pietrasiewicz /* 269000a2430fSAndrzej Pietrasiewicz * USB_DT_ENDPOINT are handled in 269100a2430fSAndrzej Pietrasiewicz * __ffs_func_bind_do_descs(). 269200a2430fSAndrzej Pietrasiewicz */ 269300a2430fSAndrzej Pietrasiewicz if (desc->bDescriptorType == USB_DT_ENDPOINT) 269400a2430fSAndrzej Pietrasiewicz return 0; 269500a2430fSAndrzej Pietrasiewicz 269600a2430fSAndrzej Pietrasiewicz idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; 269700a2430fSAndrzej Pietrasiewicz if (unlikely(!func->eps[idx].ep)) 269800a2430fSAndrzej Pietrasiewicz return -EINVAL; 269900a2430fSAndrzej Pietrasiewicz 270000a2430fSAndrzej Pietrasiewicz { 270100a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor **descs; 270200a2430fSAndrzej Pietrasiewicz descs = func->eps[idx].descs; 270300a2430fSAndrzej Pietrasiewicz newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; 270400a2430fSAndrzej Pietrasiewicz } 270500a2430fSAndrzej Pietrasiewicz break; 270600a2430fSAndrzej Pietrasiewicz } 270700a2430fSAndrzej Pietrasiewicz 270800a2430fSAndrzej Pietrasiewicz pr_vdebug("%02x -> %02x\n", *valuep, newValue); 270900a2430fSAndrzej Pietrasiewicz *valuep = newValue; 271000a2430fSAndrzej Pietrasiewicz return 0; 271100a2430fSAndrzej Pietrasiewicz } 271200a2430fSAndrzej Pietrasiewicz 271300a2430fSAndrzej Pietrasiewicz static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, 271400a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h, void *data, 271500a2430fSAndrzej Pietrasiewicz unsigned len, void *priv) 271600a2430fSAndrzej Pietrasiewicz { 271700a2430fSAndrzej Pietrasiewicz struct ffs_function *func = priv; 271800a2430fSAndrzej Pietrasiewicz u8 length = 0; 271900a2430fSAndrzej Pietrasiewicz 272000a2430fSAndrzej Pietrasiewicz switch (type) { 272100a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_COMPAT: { 272200a2430fSAndrzej Pietrasiewicz struct usb_ext_compat_desc *desc = data; 272300a2430fSAndrzej Pietrasiewicz struct usb_os_desc_table *t; 272400a2430fSAndrzej Pietrasiewicz 272500a2430fSAndrzej Pietrasiewicz t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; 272600a2430fSAndrzej Pietrasiewicz t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; 272700a2430fSAndrzej Pietrasiewicz memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, 272800a2430fSAndrzej Pietrasiewicz ARRAY_SIZE(desc->CompatibleID) + 272900a2430fSAndrzej Pietrasiewicz ARRAY_SIZE(desc->SubCompatibleID)); 273000a2430fSAndrzej Pietrasiewicz length = sizeof(*desc); 273100a2430fSAndrzej Pietrasiewicz } 273200a2430fSAndrzej Pietrasiewicz break; 273300a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_PROP: { 273400a2430fSAndrzej Pietrasiewicz struct usb_ext_prop_desc *desc = data; 273500a2430fSAndrzej Pietrasiewicz struct usb_os_desc_table *t; 273600a2430fSAndrzej Pietrasiewicz struct usb_os_desc_ext_prop *ext_prop; 273700a2430fSAndrzej Pietrasiewicz char *ext_prop_name; 273800a2430fSAndrzej Pietrasiewicz char *ext_prop_data; 273900a2430fSAndrzej Pietrasiewicz 274000a2430fSAndrzej Pietrasiewicz t = &func->function.os_desc_table[h->interface]; 274100a2430fSAndrzej Pietrasiewicz t->if_id = func->interfaces_nums[h->interface]; 274200a2430fSAndrzej Pietrasiewicz 274300a2430fSAndrzej Pietrasiewicz ext_prop = func->ffs->ms_os_descs_ext_prop_avail; 274400a2430fSAndrzej Pietrasiewicz func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); 274500a2430fSAndrzej Pietrasiewicz 274600a2430fSAndrzej Pietrasiewicz ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); 274700a2430fSAndrzej Pietrasiewicz ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); 274800a2430fSAndrzej Pietrasiewicz ext_prop->data_len = le32_to_cpu(*(u32 *) 274900a2430fSAndrzej Pietrasiewicz usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); 275000a2430fSAndrzej Pietrasiewicz length = ext_prop->name_len + ext_prop->data_len + 14; 275100a2430fSAndrzej Pietrasiewicz 275200a2430fSAndrzej Pietrasiewicz ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; 275300a2430fSAndrzej Pietrasiewicz func->ffs->ms_os_descs_ext_prop_name_avail += 275400a2430fSAndrzej Pietrasiewicz ext_prop->name_len; 275500a2430fSAndrzej Pietrasiewicz 275600a2430fSAndrzej Pietrasiewicz ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; 275700a2430fSAndrzej Pietrasiewicz func->ffs->ms_os_descs_ext_prop_data_avail += 275800a2430fSAndrzej Pietrasiewicz ext_prop->data_len; 275900a2430fSAndrzej Pietrasiewicz memcpy(ext_prop_data, 276000a2430fSAndrzej Pietrasiewicz usb_ext_prop_data_ptr(data, ext_prop->name_len), 276100a2430fSAndrzej Pietrasiewicz ext_prop->data_len); 276200a2430fSAndrzej Pietrasiewicz /* unicode data reported to the host as "WCHAR"s */ 276300a2430fSAndrzej Pietrasiewicz switch (ext_prop->type) { 276400a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE: 276500a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE_ENV: 276600a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE_LINK: 276700a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE_MULTI: 276800a2430fSAndrzej Pietrasiewicz ext_prop->data_len *= 2; 276900a2430fSAndrzej Pietrasiewicz break; 277000a2430fSAndrzej Pietrasiewicz } 277100a2430fSAndrzej Pietrasiewicz ext_prop->data = ext_prop_data; 277200a2430fSAndrzej Pietrasiewicz 277300a2430fSAndrzej Pietrasiewicz memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), 277400a2430fSAndrzej Pietrasiewicz ext_prop->name_len); 277500a2430fSAndrzej Pietrasiewicz /* property name reported to the host as "WCHAR"s */ 277600a2430fSAndrzej Pietrasiewicz ext_prop->name_len *= 2; 277700a2430fSAndrzej Pietrasiewicz ext_prop->name = ext_prop_name; 277800a2430fSAndrzej Pietrasiewicz 277900a2430fSAndrzej Pietrasiewicz t->os_desc->ext_prop_len += 278000a2430fSAndrzej Pietrasiewicz ext_prop->name_len + ext_prop->data_len + 14; 278100a2430fSAndrzej Pietrasiewicz ++t->os_desc->ext_prop_count; 278200a2430fSAndrzej Pietrasiewicz list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); 278300a2430fSAndrzej Pietrasiewicz } 278400a2430fSAndrzej Pietrasiewicz break; 278500a2430fSAndrzej Pietrasiewicz default: 278600a2430fSAndrzej Pietrasiewicz pr_vdebug("unknown descriptor: %d\n", type); 278700a2430fSAndrzej Pietrasiewicz } 278800a2430fSAndrzej Pietrasiewicz 278900a2430fSAndrzej Pietrasiewicz return length; 279000a2430fSAndrzej Pietrasiewicz } 279100a2430fSAndrzej Pietrasiewicz 279200a2430fSAndrzej Pietrasiewicz static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, 279300a2430fSAndrzej Pietrasiewicz struct usb_configuration *c) 279400a2430fSAndrzej Pietrasiewicz { 279500a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 279600a2430fSAndrzej Pietrasiewicz struct f_fs_opts *ffs_opts = 279700a2430fSAndrzej Pietrasiewicz container_of(f->fi, struct f_fs_opts, func_inst); 279800a2430fSAndrzej Pietrasiewicz int ret; 279900a2430fSAndrzej Pietrasiewicz 280000a2430fSAndrzej Pietrasiewicz ENTER(); 280100a2430fSAndrzej Pietrasiewicz 280200a2430fSAndrzej Pietrasiewicz /* 280300a2430fSAndrzej Pietrasiewicz * Legacy gadget triggers binding in functionfs_ready_callback, 280400a2430fSAndrzej Pietrasiewicz * which already uses locking; taking the same lock here would 280500a2430fSAndrzej Pietrasiewicz * cause a deadlock. 280600a2430fSAndrzej Pietrasiewicz * 280700a2430fSAndrzej Pietrasiewicz * Configfs-enabled gadgets however do need ffs_dev_lock. 280800a2430fSAndrzej Pietrasiewicz */ 280900a2430fSAndrzej Pietrasiewicz if (!ffs_opts->no_configfs) 281000a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 281100a2430fSAndrzej Pietrasiewicz ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; 281200a2430fSAndrzej Pietrasiewicz func->ffs = ffs_opts->dev->ffs_data; 281300a2430fSAndrzej Pietrasiewicz if (!ffs_opts->no_configfs) 281400a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 281500a2430fSAndrzej Pietrasiewicz if (ret) 281600a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 281700a2430fSAndrzej Pietrasiewicz 281800a2430fSAndrzej Pietrasiewicz func->conf = c; 281900a2430fSAndrzej Pietrasiewicz func->gadget = c->cdev->gadget; 282000a2430fSAndrzej Pietrasiewicz 282100a2430fSAndrzej Pietrasiewicz /* 282200a2430fSAndrzej Pietrasiewicz * in drivers/usb/gadget/configfs.c:configfs_composite_bind() 282300a2430fSAndrzej Pietrasiewicz * configurations are bound in sequence with list_for_each_entry, 282400a2430fSAndrzej Pietrasiewicz * in each configuration its functions are bound in sequence 282500a2430fSAndrzej Pietrasiewicz * with list_for_each_entry, so we assume no race condition 282600a2430fSAndrzej Pietrasiewicz * with regard to ffs_opts->bound access 282700a2430fSAndrzej Pietrasiewicz */ 282800a2430fSAndrzej Pietrasiewicz if (!ffs_opts->refcnt) { 282900a2430fSAndrzej Pietrasiewicz ret = functionfs_bind(func->ffs, c->cdev); 283000a2430fSAndrzej Pietrasiewicz if (ret) 283100a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 283200a2430fSAndrzej Pietrasiewicz } 283300a2430fSAndrzej Pietrasiewicz ffs_opts->refcnt++; 283400a2430fSAndrzej Pietrasiewicz func->function.strings = func->ffs->stringtabs; 283500a2430fSAndrzej Pietrasiewicz 283600a2430fSAndrzej Pietrasiewicz return ffs_opts; 283700a2430fSAndrzej Pietrasiewicz } 283800a2430fSAndrzej Pietrasiewicz 283900a2430fSAndrzej Pietrasiewicz static int _ffs_func_bind(struct usb_configuration *c, 284000a2430fSAndrzej Pietrasiewicz struct usb_function *f) 284100a2430fSAndrzej Pietrasiewicz { 284200a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 284300a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 284400a2430fSAndrzej Pietrasiewicz 284500a2430fSAndrzej Pietrasiewicz const int full = !!func->ffs->fs_descs_count; 284600a2430fSAndrzej Pietrasiewicz const int high = gadget_is_dualspeed(func->gadget) && 284700a2430fSAndrzej Pietrasiewicz func->ffs->hs_descs_count; 284800a2430fSAndrzej Pietrasiewicz const int super = gadget_is_superspeed(func->gadget) && 284900a2430fSAndrzej Pietrasiewicz func->ffs->ss_descs_count; 285000a2430fSAndrzej Pietrasiewicz 285100a2430fSAndrzej Pietrasiewicz int fs_len, hs_len, ss_len, ret, i; 28520015f915SDan Carpenter struct ffs_ep *eps_ptr; 285300a2430fSAndrzej Pietrasiewicz 285400a2430fSAndrzej Pietrasiewicz /* Make it a single chunk, less management later on */ 285500a2430fSAndrzej Pietrasiewicz vla_group(d); 285600a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); 285700a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, 285800a2430fSAndrzej Pietrasiewicz full ? ffs->fs_descs_count + 1 : 0); 285900a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, 286000a2430fSAndrzej Pietrasiewicz high ? ffs->hs_descs_count + 1 : 0); 286100a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, 286200a2430fSAndrzej Pietrasiewicz super ? ffs->ss_descs_count + 1 : 0); 286300a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, short, inums, ffs->interfaces_count); 286400a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, 286500a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0); 286600a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char[16], ext_compat, 286700a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0); 286800a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_os_desc, os_desc, 286900a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0); 287000a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, 287100a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_count); 287200a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char, ext_prop_name, 287300a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_name_len); 287400a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char, ext_prop_data, 287500a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_data_len); 287600a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); 287700a2430fSAndrzej Pietrasiewicz char *vlabuf; 287800a2430fSAndrzej Pietrasiewicz 287900a2430fSAndrzej Pietrasiewicz ENTER(); 288000a2430fSAndrzej Pietrasiewicz 288100a2430fSAndrzej Pietrasiewicz /* Has descriptors only for speeds gadget does not support */ 288200a2430fSAndrzej Pietrasiewicz if (unlikely(!(full | high | super))) 288300a2430fSAndrzej Pietrasiewicz return -ENOTSUPP; 288400a2430fSAndrzej Pietrasiewicz 288500a2430fSAndrzej Pietrasiewicz /* Allocate a single chunk, less management later on */ 288600a2430fSAndrzej Pietrasiewicz vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); 288700a2430fSAndrzej Pietrasiewicz if (unlikely(!vlabuf)) 288800a2430fSAndrzej Pietrasiewicz return -ENOMEM; 288900a2430fSAndrzej Pietrasiewicz 289000a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); 289100a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_name_avail = 289200a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, ext_prop_name); 289300a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_data_avail = 289400a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, ext_prop_data); 289500a2430fSAndrzej Pietrasiewicz 289600a2430fSAndrzej Pietrasiewicz /* Copy descriptors */ 289700a2430fSAndrzej Pietrasiewicz memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, 289800a2430fSAndrzej Pietrasiewicz ffs->raw_descs_length); 289900a2430fSAndrzej Pietrasiewicz 290000a2430fSAndrzej Pietrasiewicz memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); 29010015f915SDan Carpenter eps_ptr = vla_ptr(vlabuf, d, eps); 29020015f915SDan Carpenter for (i = 0; i < ffs->eps_count; i++) 29030015f915SDan Carpenter eps_ptr[i].num = -1; 290400a2430fSAndrzej Pietrasiewicz 290500a2430fSAndrzej Pietrasiewicz /* Save pointers 290600a2430fSAndrzej Pietrasiewicz * d_eps == vlabuf, func->eps used to kfree vlabuf later 290700a2430fSAndrzej Pietrasiewicz */ 290800a2430fSAndrzej Pietrasiewicz func->eps = vla_ptr(vlabuf, d, eps); 290900a2430fSAndrzej Pietrasiewicz func->interfaces_nums = vla_ptr(vlabuf, d, inums); 291000a2430fSAndrzej Pietrasiewicz 291100a2430fSAndrzej Pietrasiewicz /* 291200a2430fSAndrzej Pietrasiewicz * Go through all the endpoint descriptors and allocate 291300a2430fSAndrzej Pietrasiewicz * endpoints first, so that later we can rewrite the endpoint 291400a2430fSAndrzej Pietrasiewicz * numbers without worrying that it may be described later on. 291500a2430fSAndrzej Pietrasiewicz */ 291600a2430fSAndrzej Pietrasiewicz if (likely(full)) { 291700a2430fSAndrzej Pietrasiewicz func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); 291800a2430fSAndrzej Pietrasiewicz fs_len = ffs_do_descs(ffs->fs_descs_count, 291900a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs), 292000a2430fSAndrzej Pietrasiewicz d_raw_descs__sz, 292100a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_descs, func); 292200a2430fSAndrzej Pietrasiewicz if (unlikely(fs_len < 0)) { 292300a2430fSAndrzej Pietrasiewicz ret = fs_len; 292400a2430fSAndrzej Pietrasiewicz goto error; 292500a2430fSAndrzej Pietrasiewicz } 292600a2430fSAndrzej Pietrasiewicz } else { 292700a2430fSAndrzej Pietrasiewicz fs_len = 0; 292800a2430fSAndrzej Pietrasiewicz } 292900a2430fSAndrzej Pietrasiewicz 293000a2430fSAndrzej Pietrasiewicz if (likely(high)) { 293100a2430fSAndrzej Pietrasiewicz func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); 293200a2430fSAndrzej Pietrasiewicz hs_len = ffs_do_descs(ffs->hs_descs_count, 293300a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs) + fs_len, 293400a2430fSAndrzej Pietrasiewicz d_raw_descs__sz - fs_len, 293500a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_descs, func); 293600a2430fSAndrzej Pietrasiewicz if (unlikely(hs_len < 0)) { 293700a2430fSAndrzej Pietrasiewicz ret = hs_len; 293800a2430fSAndrzej Pietrasiewicz goto error; 293900a2430fSAndrzej Pietrasiewicz } 294000a2430fSAndrzej Pietrasiewicz } else { 294100a2430fSAndrzej Pietrasiewicz hs_len = 0; 294200a2430fSAndrzej Pietrasiewicz } 294300a2430fSAndrzej Pietrasiewicz 294400a2430fSAndrzej Pietrasiewicz if (likely(super)) { 294500a2430fSAndrzej Pietrasiewicz func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); 294600a2430fSAndrzej Pietrasiewicz ss_len = ffs_do_descs(ffs->ss_descs_count, 294700a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, 294800a2430fSAndrzej Pietrasiewicz d_raw_descs__sz - fs_len - hs_len, 294900a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_descs, func); 295000a2430fSAndrzej Pietrasiewicz if (unlikely(ss_len < 0)) { 295100a2430fSAndrzej Pietrasiewicz ret = ss_len; 295200a2430fSAndrzej Pietrasiewicz goto error; 295300a2430fSAndrzej Pietrasiewicz } 295400a2430fSAndrzej Pietrasiewicz } else { 295500a2430fSAndrzej Pietrasiewicz ss_len = 0; 295600a2430fSAndrzej Pietrasiewicz } 295700a2430fSAndrzej Pietrasiewicz 295800a2430fSAndrzej Pietrasiewicz /* 295900a2430fSAndrzej Pietrasiewicz * Now handle interface numbers allocation and interface and 296000a2430fSAndrzej Pietrasiewicz * endpoint numbers rewriting. We can do that in one go 296100a2430fSAndrzej Pietrasiewicz * now. 296200a2430fSAndrzej Pietrasiewicz */ 296300a2430fSAndrzej Pietrasiewicz ret = ffs_do_descs(ffs->fs_descs_count + 296400a2430fSAndrzej Pietrasiewicz (high ? ffs->hs_descs_count : 0) + 296500a2430fSAndrzej Pietrasiewicz (super ? ffs->ss_descs_count : 0), 296600a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, 296700a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_nums, func); 296800a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 296900a2430fSAndrzej Pietrasiewicz goto error; 297000a2430fSAndrzej Pietrasiewicz 297100a2430fSAndrzej Pietrasiewicz func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); 2972c6010c8bSJim Lin if (c->cdev->use_os_string) { 297300a2430fSAndrzej Pietrasiewicz for (i = 0; i < ffs->interfaces_count; ++i) { 297400a2430fSAndrzej Pietrasiewicz struct usb_os_desc *desc; 297500a2430fSAndrzej Pietrasiewicz 297600a2430fSAndrzej Pietrasiewicz desc = func->function.os_desc_table[i].os_desc = 297700a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, os_desc) + 297800a2430fSAndrzej Pietrasiewicz i * sizeof(struct usb_os_desc); 297900a2430fSAndrzej Pietrasiewicz desc->ext_compat_id = 298000a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, ext_compat) + i * 16; 298100a2430fSAndrzej Pietrasiewicz INIT_LIST_HEAD(&desc->ext_prop); 298200a2430fSAndrzej Pietrasiewicz } 298300a2430fSAndrzej Pietrasiewicz ret = ffs_do_os_descs(ffs->ms_os_descs_count, 298400a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs) + 298500a2430fSAndrzej Pietrasiewicz fs_len + hs_len + ss_len, 2986c6010c8bSJim Lin d_raw_descs__sz - fs_len - hs_len - 2987c6010c8bSJim Lin ss_len, 298800a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_os_desc, func); 298900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 299000a2430fSAndrzej Pietrasiewicz goto error; 2991c6010c8bSJim Lin } 299200a2430fSAndrzej Pietrasiewicz func->function.os_desc_n = 299300a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0; 299400a2430fSAndrzej Pietrasiewicz 299500a2430fSAndrzej Pietrasiewicz /* And we're done */ 299600a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_BIND); 299700a2430fSAndrzej Pietrasiewicz return 0; 299800a2430fSAndrzej Pietrasiewicz 299900a2430fSAndrzej Pietrasiewicz error: 300000a2430fSAndrzej Pietrasiewicz /* XXX Do we need to release all claimed endpoints here? */ 300100a2430fSAndrzej Pietrasiewicz return ret; 300200a2430fSAndrzej Pietrasiewicz } 300300a2430fSAndrzej Pietrasiewicz 300400a2430fSAndrzej Pietrasiewicz static int ffs_func_bind(struct usb_configuration *c, 300500a2430fSAndrzej Pietrasiewicz struct usb_function *f) 300600a2430fSAndrzej Pietrasiewicz { 300700a2430fSAndrzej Pietrasiewicz struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); 300855d81121SRobert Baldyga struct ffs_function *func = ffs_func_from_usb(f); 300955d81121SRobert Baldyga int ret; 301000a2430fSAndrzej Pietrasiewicz 301100a2430fSAndrzej Pietrasiewicz if (IS_ERR(ffs_opts)) 301200a2430fSAndrzej Pietrasiewicz return PTR_ERR(ffs_opts); 301300a2430fSAndrzej Pietrasiewicz 301455d81121SRobert Baldyga ret = _ffs_func_bind(c, f); 301555d81121SRobert Baldyga if (ret && !--ffs_opts->refcnt) 301655d81121SRobert Baldyga functionfs_unbind(func->ffs); 301755d81121SRobert Baldyga 301855d81121SRobert Baldyga return ret; 301900a2430fSAndrzej Pietrasiewicz } 302000a2430fSAndrzej Pietrasiewicz 302100a2430fSAndrzej Pietrasiewicz 302200a2430fSAndrzej Pietrasiewicz /* Other USB function hooks *************************************************/ 302300a2430fSAndrzej Pietrasiewicz 302418d6b32fSRobert Baldyga static void ffs_reset_work(struct work_struct *work) 302518d6b32fSRobert Baldyga { 302618d6b32fSRobert Baldyga struct ffs_data *ffs = container_of(work, 302718d6b32fSRobert Baldyga struct ffs_data, reset_work); 302818d6b32fSRobert Baldyga ffs_data_reset(ffs); 302918d6b32fSRobert Baldyga } 303018d6b32fSRobert Baldyga 303100a2430fSAndrzej Pietrasiewicz static int ffs_func_set_alt(struct usb_function *f, 303200a2430fSAndrzej Pietrasiewicz unsigned interface, unsigned alt) 303300a2430fSAndrzej Pietrasiewicz { 303400a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 303500a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 303600a2430fSAndrzej Pietrasiewicz int ret = 0, intf; 303700a2430fSAndrzej Pietrasiewicz 303800a2430fSAndrzej Pietrasiewicz if (alt != (unsigned)-1) { 303900a2430fSAndrzej Pietrasiewicz intf = ffs_func_revmap_intf(func, interface); 304000a2430fSAndrzej Pietrasiewicz if (unlikely(intf < 0)) 304100a2430fSAndrzej Pietrasiewicz return intf; 304200a2430fSAndrzej Pietrasiewicz } 304300a2430fSAndrzej Pietrasiewicz 304400a2430fSAndrzej Pietrasiewicz if (ffs->func) 304500a2430fSAndrzej Pietrasiewicz ffs_func_eps_disable(ffs->func); 304600a2430fSAndrzej Pietrasiewicz 304718d6b32fSRobert Baldyga if (ffs->state == FFS_DEACTIVATED) { 304818d6b32fSRobert Baldyga ffs->state = FFS_CLOSING; 304918d6b32fSRobert Baldyga INIT_WORK(&ffs->reset_work, ffs_reset_work); 305018d6b32fSRobert Baldyga schedule_work(&ffs->reset_work); 305118d6b32fSRobert Baldyga return -ENODEV; 305218d6b32fSRobert Baldyga } 305318d6b32fSRobert Baldyga 305400a2430fSAndrzej Pietrasiewicz if (ffs->state != FFS_ACTIVE) 305500a2430fSAndrzej Pietrasiewicz return -ENODEV; 305600a2430fSAndrzej Pietrasiewicz 305700a2430fSAndrzej Pietrasiewicz if (alt == (unsigned)-1) { 305800a2430fSAndrzej Pietrasiewicz ffs->func = NULL; 305900a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_DISABLE); 306000a2430fSAndrzej Pietrasiewicz return 0; 306100a2430fSAndrzej Pietrasiewicz } 306200a2430fSAndrzej Pietrasiewicz 306300a2430fSAndrzej Pietrasiewicz ffs->func = func; 306400a2430fSAndrzej Pietrasiewicz ret = ffs_func_eps_enable(func); 306500a2430fSAndrzej Pietrasiewicz if (likely(ret >= 0)) 306600a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_ENABLE); 306700a2430fSAndrzej Pietrasiewicz return ret; 306800a2430fSAndrzej Pietrasiewicz } 306900a2430fSAndrzej Pietrasiewicz 307000a2430fSAndrzej Pietrasiewicz static void ffs_func_disable(struct usb_function *f) 307100a2430fSAndrzej Pietrasiewicz { 307200a2430fSAndrzej Pietrasiewicz ffs_func_set_alt(f, 0, (unsigned)-1); 307300a2430fSAndrzej Pietrasiewicz } 307400a2430fSAndrzej Pietrasiewicz 307500a2430fSAndrzej Pietrasiewicz static int ffs_func_setup(struct usb_function *f, 307600a2430fSAndrzej Pietrasiewicz const struct usb_ctrlrequest *creq) 307700a2430fSAndrzej Pietrasiewicz { 307800a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 307900a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 308000a2430fSAndrzej Pietrasiewicz unsigned long flags; 308100a2430fSAndrzej Pietrasiewicz int ret; 308200a2430fSAndrzej Pietrasiewicz 308300a2430fSAndrzej Pietrasiewicz ENTER(); 308400a2430fSAndrzej Pietrasiewicz 308500a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); 308600a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); 308700a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); 308800a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); 308900a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); 309000a2430fSAndrzej Pietrasiewicz 309100a2430fSAndrzej Pietrasiewicz /* 309200a2430fSAndrzej Pietrasiewicz * Most requests directed to interface go through here 309300a2430fSAndrzej Pietrasiewicz * (notable exceptions are set/get interface) so we need to 309400a2430fSAndrzej Pietrasiewicz * handle them. All other either handled by composite or 309500a2430fSAndrzej Pietrasiewicz * passed to usb_configuration->setup() (if one is set). No 309600a2430fSAndrzej Pietrasiewicz * matter, we will handle requests directed to endpoint here 309700a2430fSAndrzej Pietrasiewicz * as well (as it's straightforward) but what to do with any 309800a2430fSAndrzej Pietrasiewicz * other request? 309900a2430fSAndrzej Pietrasiewicz */ 310000a2430fSAndrzej Pietrasiewicz if (ffs->state != FFS_ACTIVE) 310100a2430fSAndrzej Pietrasiewicz return -ENODEV; 310200a2430fSAndrzej Pietrasiewicz 310300a2430fSAndrzej Pietrasiewicz switch (creq->bRequestType & USB_RECIP_MASK) { 310400a2430fSAndrzej Pietrasiewicz case USB_RECIP_INTERFACE: 310500a2430fSAndrzej Pietrasiewicz ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); 310600a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 310700a2430fSAndrzej Pietrasiewicz return ret; 310800a2430fSAndrzej Pietrasiewicz break; 310900a2430fSAndrzej Pietrasiewicz 311000a2430fSAndrzej Pietrasiewicz case USB_RECIP_ENDPOINT: 311100a2430fSAndrzej Pietrasiewicz ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); 311200a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 311300a2430fSAndrzej Pietrasiewicz return ret; 31141b0bf88fSRobert Baldyga if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) 31151b0bf88fSRobert Baldyga ret = func->ffs->eps_addrmap[ret]; 311600a2430fSAndrzej Pietrasiewicz break; 311700a2430fSAndrzej Pietrasiewicz 311800a2430fSAndrzej Pietrasiewicz default: 311900a2430fSAndrzej Pietrasiewicz return -EOPNOTSUPP; 312000a2430fSAndrzej Pietrasiewicz } 312100a2430fSAndrzej Pietrasiewicz 312200a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&ffs->ev.waitq.lock, flags); 312300a2430fSAndrzej Pietrasiewicz ffs->ev.setup = *creq; 312400a2430fSAndrzej Pietrasiewicz ffs->ev.setup.wIndex = cpu_to_le16(ret); 312500a2430fSAndrzej Pietrasiewicz __ffs_event_add(ffs, FUNCTIONFS_SETUP); 312600a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); 312700a2430fSAndrzej Pietrasiewicz 312800a2430fSAndrzej Pietrasiewicz return 0; 312900a2430fSAndrzej Pietrasiewicz } 313000a2430fSAndrzej Pietrasiewicz 313100a2430fSAndrzej Pietrasiewicz static void ffs_func_suspend(struct usb_function *f) 313200a2430fSAndrzej Pietrasiewicz { 313300a2430fSAndrzej Pietrasiewicz ENTER(); 313400a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); 313500a2430fSAndrzej Pietrasiewicz } 313600a2430fSAndrzej Pietrasiewicz 313700a2430fSAndrzej Pietrasiewicz static void ffs_func_resume(struct usb_function *f) 313800a2430fSAndrzej Pietrasiewicz { 313900a2430fSAndrzej Pietrasiewicz ENTER(); 314000a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); 314100a2430fSAndrzej Pietrasiewicz } 314200a2430fSAndrzej Pietrasiewicz 314300a2430fSAndrzej Pietrasiewicz 314400a2430fSAndrzej Pietrasiewicz /* Endpoint and interface numbers reverse mapping ***************************/ 314500a2430fSAndrzej Pietrasiewicz 314600a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) 314700a2430fSAndrzej Pietrasiewicz { 314800a2430fSAndrzej Pietrasiewicz num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; 314900a2430fSAndrzej Pietrasiewicz return num ? num : -EDOM; 315000a2430fSAndrzej Pietrasiewicz } 315100a2430fSAndrzej Pietrasiewicz 315200a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) 315300a2430fSAndrzej Pietrasiewicz { 315400a2430fSAndrzej Pietrasiewicz short *nums = func->interfaces_nums; 315500a2430fSAndrzej Pietrasiewicz unsigned count = func->ffs->interfaces_count; 315600a2430fSAndrzej Pietrasiewicz 315700a2430fSAndrzej Pietrasiewicz for (; count; --count, ++nums) { 315800a2430fSAndrzej Pietrasiewicz if (*nums >= 0 && *nums == intf) 315900a2430fSAndrzej Pietrasiewicz return nums - func->interfaces_nums; 316000a2430fSAndrzej Pietrasiewicz } 316100a2430fSAndrzej Pietrasiewicz 316200a2430fSAndrzej Pietrasiewicz return -EDOM; 316300a2430fSAndrzej Pietrasiewicz } 316400a2430fSAndrzej Pietrasiewicz 316500a2430fSAndrzej Pietrasiewicz 316600a2430fSAndrzej Pietrasiewicz /* Devices management *******************************************************/ 316700a2430fSAndrzej Pietrasiewicz 316800a2430fSAndrzej Pietrasiewicz static LIST_HEAD(ffs_devices); 316900a2430fSAndrzej Pietrasiewicz 317000a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_do_find_dev(const char *name) 317100a2430fSAndrzej Pietrasiewicz { 317200a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 317300a2430fSAndrzej Pietrasiewicz 317400a2430fSAndrzej Pietrasiewicz list_for_each_entry(dev, &ffs_devices, entry) { 317500a2430fSAndrzej Pietrasiewicz if (!dev->name || !name) 317600a2430fSAndrzej Pietrasiewicz continue; 317700a2430fSAndrzej Pietrasiewicz if (strcmp(dev->name, name) == 0) 317800a2430fSAndrzej Pietrasiewicz return dev; 317900a2430fSAndrzej Pietrasiewicz } 318000a2430fSAndrzej Pietrasiewicz 318100a2430fSAndrzej Pietrasiewicz return NULL; 318200a2430fSAndrzej Pietrasiewicz } 318300a2430fSAndrzej Pietrasiewicz 318400a2430fSAndrzej Pietrasiewicz /* 318500a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 318600a2430fSAndrzej Pietrasiewicz */ 318700a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_get_single_dev(void) 318800a2430fSAndrzej Pietrasiewicz { 318900a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 319000a2430fSAndrzej Pietrasiewicz 319100a2430fSAndrzej Pietrasiewicz if (list_is_singular(&ffs_devices)) { 319200a2430fSAndrzej Pietrasiewicz dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); 319300a2430fSAndrzej Pietrasiewicz if (dev->single) 319400a2430fSAndrzej Pietrasiewicz return dev; 319500a2430fSAndrzej Pietrasiewicz } 319600a2430fSAndrzej Pietrasiewicz 319700a2430fSAndrzej Pietrasiewicz return NULL; 319800a2430fSAndrzej Pietrasiewicz } 319900a2430fSAndrzej Pietrasiewicz 320000a2430fSAndrzej Pietrasiewicz /* 320100a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 320200a2430fSAndrzej Pietrasiewicz */ 320300a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_find_dev(const char *name) 320400a2430fSAndrzej Pietrasiewicz { 320500a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 320600a2430fSAndrzej Pietrasiewicz 320700a2430fSAndrzej Pietrasiewicz dev = _ffs_get_single_dev(); 320800a2430fSAndrzej Pietrasiewicz if (dev) 320900a2430fSAndrzej Pietrasiewicz return dev; 321000a2430fSAndrzej Pietrasiewicz 321100a2430fSAndrzej Pietrasiewicz return _ffs_do_find_dev(name); 321200a2430fSAndrzej Pietrasiewicz } 321300a2430fSAndrzej Pietrasiewicz 321400a2430fSAndrzej Pietrasiewicz /* Configfs support *********************************************************/ 321500a2430fSAndrzej Pietrasiewicz 321600a2430fSAndrzej Pietrasiewicz static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) 321700a2430fSAndrzej Pietrasiewicz { 321800a2430fSAndrzej Pietrasiewicz return container_of(to_config_group(item), struct f_fs_opts, 321900a2430fSAndrzej Pietrasiewicz func_inst.group); 322000a2430fSAndrzej Pietrasiewicz } 322100a2430fSAndrzej Pietrasiewicz 322200a2430fSAndrzej Pietrasiewicz static void ffs_attr_release(struct config_item *item) 322300a2430fSAndrzej Pietrasiewicz { 322400a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts = to_ffs_opts(item); 322500a2430fSAndrzej Pietrasiewicz 322600a2430fSAndrzej Pietrasiewicz usb_put_function_instance(&opts->func_inst); 322700a2430fSAndrzej Pietrasiewicz } 322800a2430fSAndrzej Pietrasiewicz 322900a2430fSAndrzej Pietrasiewicz static struct configfs_item_operations ffs_item_ops = { 323000a2430fSAndrzej Pietrasiewicz .release = ffs_attr_release, 323100a2430fSAndrzej Pietrasiewicz }; 323200a2430fSAndrzej Pietrasiewicz 323300a2430fSAndrzej Pietrasiewicz static struct config_item_type ffs_func_type = { 323400a2430fSAndrzej Pietrasiewicz .ct_item_ops = &ffs_item_ops, 323500a2430fSAndrzej Pietrasiewicz .ct_owner = THIS_MODULE, 323600a2430fSAndrzej Pietrasiewicz }; 323700a2430fSAndrzej Pietrasiewicz 323800a2430fSAndrzej Pietrasiewicz 323900a2430fSAndrzej Pietrasiewicz /* Function registration interface ******************************************/ 324000a2430fSAndrzej Pietrasiewicz 324100a2430fSAndrzej Pietrasiewicz static void ffs_free_inst(struct usb_function_instance *f) 324200a2430fSAndrzej Pietrasiewicz { 324300a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts; 324400a2430fSAndrzej Pietrasiewicz 324500a2430fSAndrzej Pietrasiewicz opts = to_f_fs_opts(f); 324600a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 324700a2430fSAndrzej Pietrasiewicz _ffs_free_dev(opts->dev); 324800a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 324900a2430fSAndrzej Pietrasiewicz kfree(opts); 325000a2430fSAndrzej Pietrasiewicz } 325100a2430fSAndrzej Pietrasiewicz 325200a2430fSAndrzej Pietrasiewicz #define MAX_INST_NAME_LEN 40 325300a2430fSAndrzej Pietrasiewicz 325400a2430fSAndrzej Pietrasiewicz static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) 325500a2430fSAndrzej Pietrasiewicz { 325600a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts; 325700a2430fSAndrzej Pietrasiewicz char *ptr; 325800a2430fSAndrzej Pietrasiewicz const char *tmp; 325900a2430fSAndrzej Pietrasiewicz int name_len, ret; 326000a2430fSAndrzej Pietrasiewicz 326100a2430fSAndrzej Pietrasiewicz name_len = strlen(name) + 1; 326200a2430fSAndrzej Pietrasiewicz if (name_len > MAX_INST_NAME_LEN) 326300a2430fSAndrzej Pietrasiewicz return -ENAMETOOLONG; 326400a2430fSAndrzej Pietrasiewicz 326500a2430fSAndrzej Pietrasiewicz ptr = kstrndup(name, name_len, GFP_KERNEL); 326600a2430fSAndrzej Pietrasiewicz if (!ptr) 326700a2430fSAndrzej Pietrasiewicz return -ENOMEM; 326800a2430fSAndrzej Pietrasiewicz 326900a2430fSAndrzej Pietrasiewicz opts = to_f_fs_opts(fi); 327000a2430fSAndrzej Pietrasiewicz tmp = NULL; 327100a2430fSAndrzej Pietrasiewicz 327200a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 327300a2430fSAndrzej Pietrasiewicz 327400a2430fSAndrzej Pietrasiewicz tmp = opts->dev->name_allocated ? opts->dev->name : NULL; 327500a2430fSAndrzej Pietrasiewicz ret = _ffs_name_dev(opts->dev, ptr); 327600a2430fSAndrzej Pietrasiewicz if (ret) { 327700a2430fSAndrzej Pietrasiewicz kfree(ptr); 327800a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 327900a2430fSAndrzej Pietrasiewicz return ret; 328000a2430fSAndrzej Pietrasiewicz } 328100a2430fSAndrzej Pietrasiewicz opts->dev->name_allocated = true; 328200a2430fSAndrzej Pietrasiewicz 328300a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 328400a2430fSAndrzej Pietrasiewicz 328500a2430fSAndrzej Pietrasiewicz kfree(tmp); 328600a2430fSAndrzej Pietrasiewicz 328700a2430fSAndrzej Pietrasiewicz return 0; 328800a2430fSAndrzej Pietrasiewicz } 328900a2430fSAndrzej Pietrasiewicz 329000a2430fSAndrzej Pietrasiewicz static struct usb_function_instance *ffs_alloc_inst(void) 329100a2430fSAndrzej Pietrasiewicz { 329200a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts; 329300a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 329400a2430fSAndrzej Pietrasiewicz 329500a2430fSAndrzej Pietrasiewicz opts = kzalloc(sizeof(*opts), GFP_KERNEL); 329600a2430fSAndrzej Pietrasiewicz if (!opts) 329700a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 329800a2430fSAndrzej Pietrasiewicz 329900a2430fSAndrzej Pietrasiewicz opts->func_inst.set_inst_name = ffs_set_inst_name; 330000a2430fSAndrzej Pietrasiewicz opts->func_inst.free_func_inst = ffs_free_inst; 330100a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 330200a2430fSAndrzej Pietrasiewicz dev = _ffs_alloc_dev(); 330300a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 330400a2430fSAndrzej Pietrasiewicz if (IS_ERR(dev)) { 330500a2430fSAndrzej Pietrasiewicz kfree(opts); 330600a2430fSAndrzej Pietrasiewicz return ERR_CAST(dev); 330700a2430fSAndrzej Pietrasiewicz } 330800a2430fSAndrzej Pietrasiewicz opts->dev = dev; 330900a2430fSAndrzej Pietrasiewicz dev->opts = opts; 331000a2430fSAndrzej Pietrasiewicz 331100a2430fSAndrzej Pietrasiewicz config_group_init_type_name(&opts->func_inst.group, "", 331200a2430fSAndrzej Pietrasiewicz &ffs_func_type); 331300a2430fSAndrzej Pietrasiewicz return &opts->func_inst; 331400a2430fSAndrzej Pietrasiewicz } 331500a2430fSAndrzej Pietrasiewicz 331600a2430fSAndrzej Pietrasiewicz static void ffs_free(struct usb_function *f) 331700a2430fSAndrzej Pietrasiewicz { 331800a2430fSAndrzej Pietrasiewicz kfree(ffs_func_from_usb(f)); 331900a2430fSAndrzej Pietrasiewicz } 332000a2430fSAndrzej Pietrasiewicz 332100a2430fSAndrzej Pietrasiewicz static void ffs_func_unbind(struct usb_configuration *c, 332200a2430fSAndrzej Pietrasiewicz struct usb_function *f) 332300a2430fSAndrzej Pietrasiewicz { 332400a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 332500a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 332600a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts = 332700a2430fSAndrzej Pietrasiewicz container_of(f->fi, struct f_fs_opts, func_inst); 332800a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = func->eps; 332900a2430fSAndrzej Pietrasiewicz unsigned count = ffs->eps_count; 333000a2430fSAndrzej Pietrasiewicz unsigned long flags; 333100a2430fSAndrzej Pietrasiewicz 333200a2430fSAndrzej Pietrasiewicz ENTER(); 333300a2430fSAndrzej Pietrasiewicz if (ffs->func == func) { 333400a2430fSAndrzej Pietrasiewicz ffs_func_eps_disable(func); 333500a2430fSAndrzej Pietrasiewicz ffs->func = NULL; 333600a2430fSAndrzej Pietrasiewicz } 333700a2430fSAndrzej Pietrasiewicz 333800a2430fSAndrzej Pietrasiewicz if (!--opts->refcnt) 333900a2430fSAndrzej Pietrasiewicz functionfs_unbind(ffs); 334000a2430fSAndrzej Pietrasiewicz 334100a2430fSAndrzej Pietrasiewicz /* cleanup after autoconfig */ 334200a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&func->ffs->eps_lock, flags); 334300a2430fSAndrzej Pietrasiewicz do { 334400a2430fSAndrzej Pietrasiewicz if (ep->ep && ep->req) 334500a2430fSAndrzej Pietrasiewicz usb_ep_free_request(ep->ep, ep->req); 334600a2430fSAndrzej Pietrasiewicz ep->req = NULL; 334700a2430fSAndrzej Pietrasiewicz ++ep; 334800a2430fSAndrzej Pietrasiewicz } while (--count); 334900a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&func->ffs->eps_lock, flags); 335000a2430fSAndrzej Pietrasiewicz kfree(func->eps); 335100a2430fSAndrzej Pietrasiewicz func->eps = NULL; 335200a2430fSAndrzej Pietrasiewicz /* 335300a2430fSAndrzej Pietrasiewicz * eps, descriptors and interfaces_nums are allocated in the 335400a2430fSAndrzej Pietrasiewicz * same chunk so only one free is required. 335500a2430fSAndrzej Pietrasiewicz */ 335600a2430fSAndrzej Pietrasiewicz func->function.fs_descriptors = NULL; 335700a2430fSAndrzej Pietrasiewicz func->function.hs_descriptors = NULL; 335800a2430fSAndrzej Pietrasiewicz func->function.ss_descriptors = NULL; 335900a2430fSAndrzej Pietrasiewicz func->interfaces_nums = NULL; 336000a2430fSAndrzej Pietrasiewicz 336100a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_UNBIND); 336200a2430fSAndrzej Pietrasiewicz } 336300a2430fSAndrzej Pietrasiewicz 336400a2430fSAndrzej Pietrasiewicz static struct usb_function *ffs_alloc(struct usb_function_instance *fi) 336500a2430fSAndrzej Pietrasiewicz { 336600a2430fSAndrzej Pietrasiewicz struct ffs_function *func; 336700a2430fSAndrzej Pietrasiewicz 336800a2430fSAndrzej Pietrasiewicz ENTER(); 336900a2430fSAndrzej Pietrasiewicz 337000a2430fSAndrzej Pietrasiewicz func = kzalloc(sizeof(*func), GFP_KERNEL); 337100a2430fSAndrzej Pietrasiewicz if (unlikely(!func)) 337200a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 337300a2430fSAndrzej Pietrasiewicz 337400a2430fSAndrzej Pietrasiewicz func->function.name = "Function FS Gadget"; 337500a2430fSAndrzej Pietrasiewicz 337600a2430fSAndrzej Pietrasiewicz func->function.bind = ffs_func_bind; 337700a2430fSAndrzej Pietrasiewicz func->function.unbind = ffs_func_unbind; 337800a2430fSAndrzej Pietrasiewicz func->function.set_alt = ffs_func_set_alt; 337900a2430fSAndrzej Pietrasiewicz func->function.disable = ffs_func_disable; 338000a2430fSAndrzej Pietrasiewicz func->function.setup = ffs_func_setup; 338100a2430fSAndrzej Pietrasiewicz func->function.suspend = ffs_func_suspend; 338200a2430fSAndrzej Pietrasiewicz func->function.resume = ffs_func_resume; 338300a2430fSAndrzej Pietrasiewicz func->function.free_func = ffs_free; 338400a2430fSAndrzej Pietrasiewicz 338500a2430fSAndrzej Pietrasiewicz return &func->function; 338600a2430fSAndrzej Pietrasiewicz } 338700a2430fSAndrzej Pietrasiewicz 338800a2430fSAndrzej Pietrasiewicz /* 338900a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 339000a2430fSAndrzej Pietrasiewicz */ 339100a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_alloc_dev(void) 339200a2430fSAndrzej Pietrasiewicz { 339300a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 339400a2430fSAndrzej Pietrasiewicz int ret; 339500a2430fSAndrzej Pietrasiewicz 339600a2430fSAndrzej Pietrasiewicz if (_ffs_get_single_dev()) 339700a2430fSAndrzej Pietrasiewicz return ERR_PTR(-EBUSY); 339800a2430fSAndrzej Pietrasiewicz 339900a2430fSAndrzej Pietrasiewicz dev = kzalloc(sizeof(*dev), GFP_KERNEL); 340000a2430fSAndrzej Pietrasiewicz if (!dev) 340100a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 340200a2430fSAndrzej Pietrasiewicz 340300a2430fSAndrzej Pietrasiewicz if (list_empty(&ffs_devices)) { 340400a2430fSAndrzej Pietrasiewicz ret = functionfs_init(); 340500a2430fSAndrzej Pietrasiewicz if (ret) { 340600a2430fSAndrzej Pietrasiewicz kfree(dev); 340700a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 340800a2430fSAndrzej Pietrasiewicz } 340900a2430fSAndrzej Pietrasiewicz } 341000a2430fSAndrzej Pietrasiewicz 341100a2430fSAndrzej Pietrasiewicz list_add(&dev->entry, &ffs_devices); 341200a2430fSAndrzej Pietrasiewicz 341300a2430fSAndrzej Pietrasiewicz return dev; 341400a2430fSAndrzej Pietrasiewicz } 341500a2430fSAndrzej Pietrasiewicz 341600a2430fSAndrzej Pietrasiewicz /* 341700a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 341800a2430fSAndrzej Pietrasiewicz * The caller is responsible for "name" being available whenever f_fs needs it 341900a2430fSAndrzej Pietrasiewicz */ 342000a2430fSAndrzej Pietrasiewicz static int _ffs_name_dev(struct ffs_dev *dev, const char *name) 342100a2430fSAndrzej Pietrasiewicz { 342200a2430fSAndrzej Pietrasiewicz struct ffs_dev *existing; 342300a2430fSAndrzej Pietrasiewicz 342400a2430fSAndrzej Pietrasiewicz existing = _ffs_do_find_dev(name); 342500a2430fSAndrzej Pietrasiewicz if (existing) 342600a2430fSAndrzej Pietrasiewicz return -EBUSY; 342700a2430fSAndrzej Pietrasiewicz 342800a2430fSAndrzej Pietrasiewicz dev->name = name; 342900a2430fSAndrzej Pietrasiewicz 343000a2430fSAndrzej Pietrasiewicz return 0; 343100a2430fSAndrzej Pietrasiewicz } 343200a2430fSAndrzej Pietrasiewicz 343300a2430fSAndrzej Pietrasiewicz /* 343400a2430fSAndrzej Pietrasiewicz * The caller is responsible for "name" being available whenever f_fs needs it 343500a2430fSAndrzej Pietrasiewicz */ 343600a2430fSAndrzej Pietrasiewicz int ffs_name_dev(struct ffs_dev *dev, const char *name) 343700a2430fSAndrzej Pietrasiewicz { 343800a2430fSAndrzej Pietrasiewicz int ret; 343900a2430fSAndrzej Pietrasiewicz 344000a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 344100a2430fSAndrzej Pietrasiewicz ret = _ffs_name_dev(dev, name); 344200a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 344300a2430fSAndrzej Pietrasiewicz 344400a2430fSAndrzej Pietrasiewicz return ret; 344500a2430fSAndrzej Pietrasiewicz } 344600a2430fSAndrzej Pietrasiewicz EXPORT_SYMBOL_GPL(ffs_name_dev); 344700a2430fSAndrzej Pietrasiewicz 344800a2430fSAndrzej Pietrasiewicz int ffs_single_dev(struct ffs_dev *dev) 344900a2430fSAndrzej Pietrasiewicz { 345000a2430fSAndrzej Pietrasiewicz int ret; 345100a2430fSAndrzej Pietrasiewicz 345200a2430fSAndrzej Pietrasiewicz ret = 0; 345300a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 345400a2430fSAndrzej Pietrasiewicz 345500a2430fSAndrzej Pietrasiewicz if (!list_is_singular(&ffs_devices)) 345600a2430fSAndrzej Pietrasiewicz ret = -EBUSY; 345700a2430fSAndrzej Pietrasiewicz else 345800a2430fSAndrzej Pietrasiewicz dev->single = true; 345900a2430fSAndrzej Pietrasiewicz 346000a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 346100a2430fSAndrzej Pietrasiewicz return ret; 346200a2430fSAndrzej Pietrasiewicz } 346300a2430fSAndrzej Pietrasiewicz EXPORT_SYMBOL_GPL(ffs_single_dev); 346400a2430fSAndrzej Pietrasiewicz 346500a2430fSAndrzej Pietrasiewicz /* 346600a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 346700a2430fSAndrzej Pietrasiewicz */ 346800a2430fSAndrzej Pietrasiewicz static void _ffs_free_dev(struct ffs_dev *dev) 346900a2430fSAndrzej Pietrasiewicz { 347000a2430fSAndrzej Pietrasiewicz list_del(&dev->entry); 347100a2430fSAndrzej Pietrasiewicz if (dev->name_allocated) 347200a2430fSAndrzej Pietrasiewicz kfree(dev->name); 347300a2430fSAndrzej Pietrasiewicz kfree(dev); 347400a2430fSAndrzej Pietrasiewicz if (list_empty(&ffs_devices)) 347500a2430fSAndrzej Pietrasiewicz functionfs_cleanup(); 347600a2430fSAndrzej Pietrasiewicz } 347700a2430fSAndrzej Pietrasiewicz 347800a2430fSAndrzej Pietrasiewicz static void *ffs_acquire_dev(const char *dev_name) 347900a2430fSAndrzej Pietrasiewicz { 348000a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_dev; 348100a2430fSAndrzej Pietrasiewicz 348200a2430fSAndrzej Pietrasiewicz ENTER(); 348300a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 348400a2430fSAndrzej Pietrasiewicz 348500a2430fSAndrzej Pietrasiewicz ffs_dev = _ffs_find_dev(dev_name); 348600a2430fSAndrzej Pietrasiewicz if (!ffs_dev) 348700a2430fSAndrzej Pietrasiewicz ffs_dev = ERR_PTR(-ENOENT); 348800a2430fSAndrzej Pietrasiewicz else if (ffs_dev->mounted) 348900a2430fSAndrzej Pietrasiewicz ffs_dev = ERR_PTR(-EBUSY); 349000a2430fSAndrzej Pietrasiewicz else if (ffs_dev->ffs_acquire_dev_callback && 349100a2430fSAndrzej Pietrasiewicz ffs_dev->ffs_acquire_dev_callback(ffs_dev)) 349200a2430fSAndrzej Pietrasiewicz ffs_dev = ERR_PTR(-ENOENT); 349300a2430fSAndrzej Pietrasiewicz else 349400a2430fSAndrzej Pietrasiewicz ffs_dev->mounted = true; 349500a2430fSAndrzej Pietrasiewicz 349600a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 349700a2430fSAndrzej Pietrasiewicz return ffs_dev; 349800a2430fSAndrzej Pietrasiewicz } 349900a2430fSAndrzej Pietrasiewicz 350000a2430fSAndrzej Pietrasiewicz static void ffs_release_dev(struct ffs_data *ffs_data) 350100a2430fSAndrzej Pietrasiewicz { 350200a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_dev; 350300a2430fSAndrzej Pietrasiewicz 350400a2430fSAndrzej Pietrasiewicz ENTER(); 350500a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 350600a2430fSAndrzej Pietrasiewicz 350700a2430fSAndrzej Pietrasiewicz ffs_dev = ffs_data->private_data; 350800a2430fSAndrzej Pietrasiewicz if (ffs_dev) { 350900a2430fSAndrzej Pietrasiewicz ffs_dev->mounted = false; 351000a2430fSAndrzej Pietrasiewicz 351100a2430fSAndrzej Pietrasiewicz if (ffs_dev->ffs_release_dev_callback) 351200a2430fSAndrzej Pietrasiewicz ffs_dev->ffs_release_dev_callback(ffs_dev); 351300a2430fSAndrzej Pietrasiewicz } 351400a2430fSAndrzej Pietrasiewicz 351500a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 351600a2430fSAndrzej Pietrasiewicz } 351700a2430fSAndrzej Pietrasiewicz 351800a2430fSAndrzej Pietrasiewicz static int ffs_ready(struct ffs_data *ffs) 351900a2430fSAndrzej Pietrasiewicz { 352000a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_obj; 352100a2430fSAndrzej Pietrasiewicz int ret = 0; 352200a2430fSAndrzej Pietrasiewicz 352300a2430fSAndrzej Pietrasiewicz ENTER(); 352400a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 352500a2430fSAndrzej Pietrasiewicz 352600a2430fSAndrzej Pietrasiewicz ffs_obj = ffs->private_data; 352700a2430fSAndrzej Pietrasiewicz if (!ffs_obj) { 352800a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 352900a2430fSAndrzej Pietrasiewicz goto done; 353000a2430fSAndrzej Pietrasiewicz } 353100a2430fSAndrzej Pietrasiewicz if (WARN_ON(ffs_obj->desc_ready)) { 353200a2430fSAndrzej Pietrasiewicz ret = -EBUSY; 353300a2430fSAndrzej Pietrasiewicz goto done; 353400a2430fSAndrzej Pietrasiewicz } 353500a2430fSAndrzej Pietrasiewicz 353600a2430fSAndrzej Pietrasiewicz ffs_obj->desc_ready = true; 353700a2430fSAndrzej Pietrasiewicz ffs_obj->ffs_data = ffs; 353800a2430fSAndrzej Pietrasiewicz 353949a79d8bSKrzysztof Opasiak if (ffs_obj->ffs_ready_callback) { 354000a2430fSAndrzej Pietrasiewicz ret = ffs_obj->ffs_ready_callback(ffs); 354149a79d8bSKrzysztof Opasiak if (ret) 354249a79d8bSKrzysztof Opasiak goto done; 354349a79d8bSKrzysztof Opasiak } 354400a2430fSAndrzej Pietrasiewicz 354549a79d8bSKrzysztof Opasiak set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); 354600a2430fSAndrzej Pietrasiewicz done: 354700a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 354800a2430fSAndrzej Pietrasiewicz return ret; 354900a2430fSAndrzej Pietrasiewicz } 355000a2430fSAndrzej Pietrasiewicz 355100a2430fSAndrzej Pietrasiewicz static void ffs_closed(struct ffs_data *ffs) 355200a2430fSAndrzej Pietrasiewicz { 355300a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_obj; 3554f14e9ad1SRui Miguel Silva struct f_fs_opts *opts; 355500a2430fSAndrzej Pietrasiewicz 355600a2430fSAndrzej Pietrasiewicz ENTER(); 355700a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 355800a2430fSAndrzej Pietrasiewicz 355900a2430fSAndrzej Pietrasiewicz ffs_obj = ffs->private_data; 356000a2430fSAndrzej Pietrasiewicz if (!ffs_obj) 356100a2430fSAndrzej Pietrasiewicz goto done; 356200a2430fSAndrzej Pietrasiewicz 356300a2430fSAndrzej Pietrasiewicz ffs_obj->desc_ready = false; 356400a2430fSAndrzej Pietrasiewicz 356549a79d8bSKrzysztof Opasiak if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags) && 356649a79d8bSKrzysztof Opasiak ffs_obj->ffs_closed_callback) 356700a2430fSAndrzej Pietrasiewicz ffs_obj->ffs_closed_callback(ffs); 356800a2430fSAndrzej Pietrasiewicz 3569f14e9ad1SRui Miguel Silva if (ffs_obj->opts) 3570f14e9ad1SRui Miguel Silva opts = ffs_obj->opts; 3571f14e9ad1SRui Miguel Silva else 3572f14e9ad1SRui Miguel Silva goto done; 3573f14e9ad1SRui Miguel Silva 3574f14e9ad1SRui Miguel Silva if (opts->no_configfs || !opts->func_inst.group.cg_item.ci_parent 3575f14e9ad1SRui Miguel Silva || !atomic_read(&opts->func_inst.group.cg_item.ci_kref.refcount)) 357600a2430fSAndrzej Pietrasiewicz goto done; 357700a2430fSAndrzej Pietrasiewicz 357800a2430fSAndrzej Pietrasiewicz unregister_gadget_item(ffs_obj->opts-> 357900a2430fSAndrzej Pietrasiewicz func_inst.group.cg_item.ci_parent->ci_parent); 358000a2430fSAndrzej Pietrasiewicz done: 358100a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 358200a2430fSAndrzej Pietrasiewicz } 358300a2430fSAndrzej Pietrasiewicz 358400a2430fSAndrzej Pietrasiewicz /* Misc helper functions ****************************************************/ 358500a2430fSAndrzej Pietrasiewicz 358600a2430fSAndrzej Pietrasiewicz static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) 358700a2430fSAndrzej Pietrasiewicz { 358800a2430fSAndrzej Pietrasiewicz return nonblock 358900a2430fSAndrzej Pietrasiewicz ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN 359000a2430fSAndrzej Pietrasiewicz : mutex_lock_interruptible(mutex); 359100a2430fSAndrzej Pietrasiewicz } 359200a2430fSAndrzej Pietrasiewicz 359300a2430fSAndrzej Pietrasiewicz static char *ffs_prepare_buffer(const char __user *buf, size_t len) 359400a2430fSAndrzej Pietrasiewicz { 359500a2430fSAndrzej Pietrasiewicz char *data; 359600a2430fSAndrzej Pietrasiewicz 359700a2430fSAndrzej Pietrasiewicz if (unlikely(!len)) 359800a2430fSAndrzej Pietrasiewicz return NULL; 359900a2430fSAndrzej Pietrasiewicz 360000a2430fSAndrzej Pietrasiewicz data = kmalloc(len, GFP_KERNEL); 360100a2430fSAndrzej Pietrasiewicz if (unlikely(!data)) 360200a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 360300a2430fSAndrzej Pietrasiewicz 36047fe9a937SDaniel Walter if (unlikely(copy_from_user(data, buf, len))) { 360500a2430fSAndrzej Pietrasiewicz kfree(data); 360600a2430fSAndrzej Pietrasiewicz return ERR_PTR(-EFAULT); 360700a2430fSAndrzej Pietrasiewicz } 360800a2430fSAndrzej Pietrasiewicz 360900a2430fSAndrzej Pietrasiewicz pr_vdebug("Buffer from user space:\n"); 361000a2430fSAndrzej Pietrasiewicz ffs_dump_mem("", data, len); 361100a2430fSAndrzej Pietrasiewicz 361200a2430fSAndrzej Pietrasiewicz return data; 361300a2430fSAndrzej Pietrasiewicz } 361400a2430fSAndrzej Pietrasiewicz 361500a2430fSAndrzej Pietrasiewicz DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); 361600a2430fSAndrzej Pietrasiewicz MODULE_LICENSE("GPL"); 361700a2430fSAndrzej Pietrasiewicz MODULE_AUTHOR("Michal Nazarewicz"); 3618