15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 200a2430fSAndrzej Pietrasiewicz /* 300a2430fSAndrzej Pietrasiewicz * f_fs.c -- user mode file system API for USB composite function controllers 400a2430fSAndrzej Pietrasiewicz * 500a2430fSAndrzej Pietrasiewicz * Copyright (C) 2010 Samsung Electronics 600a2430fSAndrzej Pietrasiewicz * Author: Michal Nazarewicz <mina86@mina86.com> 700a2430fSAndrzej Pietrasiewicz * 800a2430fSAndrzej Pietrasiewicz * Based on inode.c (GadgetFS) which was: 900a2430fSAndrzej Pietrasiewicz * Copyright (C) 2003-2004 David Brownell 1000a2430fSAndrzej Pietrasiewicz * Copyright (C) 2003 Agilent Technologies 1100a2430fSAndrzej Pietrasiewicz */ 1200a2430fSAndrzej Pietrasiewicz 1300a2430fSAndrzej Pietrasiewicz 1400a2430fSAndrzej Pietrasiewicz /* #define DEBUG */ 1500a2430fSAndrzej Pietrasiewicz /* #define VERBOSE_DEBUG */ 1600a2430fSAndrzej Pietrasiewicz 1700a2430fSAndrzej Pietrasiewicz #include <linux/blkdev.h> 1800a2430fSAndrzej Pietrasiewicz #include <linux/pagemap.h> 1900a2430fSAndrzej Pietrasiewicz #include <linux/export.h> 2000a2430fSAndrzej Pietrasiewicz #include <linux/hid.h> 21772a7a72SAndrzej Pietrasiewicz #include <linux/mm.h> 2200a2430fSAndrzej Pietrasiewicz #include <linux/module.h> 23772a7a72SAndrzej Pietrasiewicz #include <linux/scatterlist.h> 24174cd4b1SIngo Molnar #include <linux/sched/signal.h> 25e2e40f2cSChristoph Hellwig #include <linux/uio.h> 26772a7a72SAndrzej Pietrasiewicz #include <linux/vmalloc.h> 2700a2430fSAndrzej Pietrasiewicz #include <asm/unaligned.h> 2800a2430fSAndrzej Pietrasiewicz 297f7c548cSVincent Pelletier #include <linux/usb/ccid.h> 3000a2430fSAndrzej Pietrasiewicz #include <linux/usb/composite.h> 3100a2430fSAndrzej Pietrasiewicz #include <linux/usb/functionfs.h> 3200a2430fSAndrzej Pietrasiewicz 3300a2430fSAndrzej Pietrasiewicz #include <linux/aio.h> 3400a2430fSAndrzej Pietrasiewicz #include <linux/mmu_context.h> 3500a2430fSAndrzej Pietrasiewicz #include <linux/poll.h> 365e33f6fdSRobert Baldyga #include <linux/eventfd.h> 3700a2430fSAndrzej Pietrasiewicz 3800a2430fSAndrzej Pietrasiewicz #include "u_fs.h" 3900a2430fSAndrzej Pietrasiewicz #include "u_f.h" 4000a2430fSAndrzej Pietrasiewicz #include "u_os_desc.h" 4100a2430fSAndrzej Pietrasiewicz #include "configfs.h" 4200a2430fSAndrzej Pietrasiewicz 4300a2430fSAndrzej Pietrasiewicz #define FUNCTIONFS_MAGIC 0xa647361 /* Chosen by a honest dice roll ;) */ 4400a2430fSAndrzej Pietrasiewicz 4500a2430fSAndrzej Pietrasiewicz /* Reference counter handling */ 4600a2430fSAndrzej Pietrasiewicz static void ffs_data_get(struct ffs_data *ffs); 4700a2430fSAndrzej Pietrasiewicz static void ffs_data_put(struct ffs_data *ffs); 4800a2430fSAndrzej Pietrasiewicz /* Creates new ffs_data object. */ 49addfc582SJohn Keeping static struct ffs_data *__must_check ffs_data_new(const char *dev_name) 50addfc582SJohn Keeping __attribute__((malloc)); 5100a2430fSAndrzej Pietrasiewicz 5200a2430fSAndrzej Pietrasiewicz /* Opened counter handling. */ 5300a2430fSAndrzej Pietrasiewicz static void ffs_data_opened(struct ffs_data *ffs); 5400a2430fSAndrzej Pietrasiewicz static void ffs_data_closed(struct ffs_data *ffs); 5500a2430fSAndrzej Pietrasiewicz 5600a2430fSAndrzej Pietrasiewicz /* Called with ffs->mutex held; take over ownership of data. */ 5700a2430fSAndrzej Pietrasiewicz static int __must_check 5800a2430fSAndrzej Pietrasiewicz __ffs_data_got_descs(struct ffs_data *ffs, char *data, size_t len); 5900a2430fSAndrzej Pietrasiewicz static int __must_check 6000a2430fSAndrzej Pietrasiewicz __ffs_data_got_strings(struct ffs_data *ffs, char *data, size_t len); 6100a2430fSAndrzej Pietrasiewicz 6200a2430fSAndrzej Pietrasiewicz 6300a2430fSAndrzej Pietrasiewicz /* The function structure ***************************************************/ 6400a2430fSAndrzej Pietrasiewicz 6500a2430fSAndrzej Pietrasiewicz struct ffs_ep; 6600a2430fSAndrzej Pietrasiewicz 6700a2430fSAndrzej Pietrasiewicz struct ffs_function { 6800a2430fSAndrzej Pietrasiewicz struct usb_configuration *conf; 6900a2430fSAndrzej Pietrasiewicz struct usb_gadget *gadget; 7000a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs; 7100a2430fSAndrzej Pietrasiewicz 7200a2430fSAndrzej Pietrasiewicz struct ffs_ep *eps; 7300a2430fSAndrzej Pietrasiewicz u8 eps_revmap[16]; 7400a2430fSAndrzej Pietrasiewicz short *interfaces_nums; 7500a2430fSAndrzej Pietrasiewicz 7600a2430fSAndrzej Pietrasiewicz struct usb_function function; 7700a2430fSAndrzej Pietrasiewicz }; 7800a2430fSAndrzej Pietrasiewicz 7900a2430fSAndrzej Pietrasiewicz 8000a2430fSAndrzej Pietrasiewicz static struct ffs_function *ffs_func_from_usb(struct usb_function *f) 8100a2430fSAndrzej Pietrasiewicz { 8200a2430fSAndrzej Pietrasiewicz return container_of(f, struct ffs_function, function); 8300a2430fSAndrzej Pietrasiewicz } 8400a2430fSAndrzej Pietrasiewicz 8500a2430fSAndrzej Pietrasiewicz 8600a2430fSAndrzej Pietrasiewicz static inline enum ffs_setup_state 8700a2430fSAndrzej Pietrasiewicz ffs_setup_state_clear_cancelled(struct ffs_data *ffs) 8800a2430fSAndrzej Pietrasiewicz { 8900a2430fSAndrzej Pietrasiewicz return (enum ffs_setup_state) 9000a2430fSAndrzej Pietrasiewicz cmpxchg(&ffs->setup_state, FFS_SETUP_CANCELLED, FFS_NO_SETUP); 9100a2430fSAndrzej Pietrasiewicz } 9200a2430fSAndrzej Pietrasiewicz 9300a2430fSAndrzej Pietrasiewicz 9400a2430fSAndrzej Pietrasiewicz static void ffs_func_eps_disable(struct ffs_function *func); 9500a2430fSAndrzej Pietrasiewicz static int __must_check ffs_func_eps_enable(struct ffs_function *func); 9600a2430fSAndrzej Pietrasiewicz 9700a2430fSAndrzej Pietrasiewicz static int ffs_func_bind(struct usb_configuration *, 9800a2430fSAndrzej Pietrasiewicz struct usb_function *); 9900a2430fSAndrzej Pietrasiewicz static int ffs_func_set_alt(struct usb_function *, unsigned, unsigned); 10000a2430fSAndrzej Pietrasiewicz static void ffs_func_disable(struct usb_function *); 10100a2430fSAndrzej Pietrasiewicz static int ffs_func_setup(struct usb_function *, 10200a2430fSAndrzej Pietrasiewicz const struct usb_ctrlrequest *); 10354dfce6dSFelix Hädicke static bool ffs_func_req_match(struct usb_function *, 1041a00b457SFelix Hädicke const struct usb_ctrlrequest *, 1051a00b457SFelix Hädicke bool config0); 10600a2430fSAndrzej Pietrasiewicz static void ffs_func_suspend(struct usb_function *); 10700a2430fSAndrzej Pietrasiewicz static void ffs_func_resume(struct usb_function *); 10800a2430fSAndrzej Pietrasiewicz 10900a2430fSAndrzej Pietrasiewicz 11000a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_ep(struct ffs_function *func, u8 num); 11100a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf); 11200a2430fSAndrzej Pietrasiewicz 11300a2430fSAndrzej Pietrasiewicz 11400a2430fSAndrzej Pietrasiewicz /* The endpoints structures *************************************************/ 11500a2430fSAndrzej Pietrasiewicz 11600a2430fSAndrzej Pietrasiewicz struct ffs_ep { 11700a2430fSAndrzej Pietrasiewicz struct usb_ep *ep; /* P: ffs->eps_lock */ 11800a2430fSAndrzej Pietrasiewicz struct usb_request *req; /* P: epfile->mutex */ 11900a2430fSAndrzej Pietrasiewicz 12000a2430fSAndrzej Pietrasiewicz /* [0]: full speed, [1]: high speed, [2]: super speed */ 12100a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *descs[3]; 12200a2430fSAndrzej Pietrasiewicz 12300a2430fSAndrzej Pietrasiewicz u8 num; 12400a2430fSAndrzej Pietrasiewicz 12500a2430fSAndrzej Pietrasiewicz int status; /* P: epfile->mutex */ 12600a2430fSAndrzej Pietrasiewicz }; 12700a2430fSAndrzej Pietrasiewicz 12800a2430fSAndrzej Pietrasiewicz struct ffs_epfile { 12900a2430fSAndrzej Pietrasiewicz /* Protects ep->ep and ep->req. */ 13000a2430fSAndrzej Pietrasiewicz struct mutex mutex; 13100a2430fSAndrzej Pietrasiewicz 13200a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs; 13300a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep; /* P: ffs->eps_lock */ 13400a2430fSAndrzej Pietrasiewicz 13500a2430fSAndrzej Pietrasiewicz struct dentry *dentry; 13600a2430fSAndrzej Pietrasiewicz 1379353afbbSMichal Nazarewicz /* 1389353afbbSMichal Nazarewicz * Buffer for holding data from partial reads which may happen since 1399353afbbSMichal Nazarewicz * we’re rounding user read requests to a multiple of a max packet size. 140a9e6f83cSMichal Nazarewicz * 141a9e6f83cSMichal Nazarewicz * The pointer is initialised with NULL value and may be set by 142a9e6f83cSMichal Nazarewicz * __ffs_epfile_read_data function to point to a temporary buffer. 143a9e6f83cSMichal Nazarewicz * 144a9e6f83cSMichal Nazarewicz * In normal operation, calls to __ffs_epfile_read_buffered will consume 145a9e6f83cSMichal Nazarewicz * data from said buffer and eventually free it. Importantly, while the 146a9e6f83cSMichal Nazarewicz * function is using the buffer, it sets the pointer to NULL. This is 147a9e6f83cSMichal Nazarewicz * all right since __ffs_epfile_read_data and __ffs_epfile_read_buffered 148a9e6f83cSMichal Nazarewicz * can never run concurrently (they are synchronised by epfile->mutex) 149a9e6f83cSMichal Nazarewicz * so the latter will not assign a new value to the pointer. 150a9e6f83cSMichal Nazarewicz * 151a9e6f83cSMichal Nazarewicz * Meanwhile ffs_func_eps_disable frees the buffer (if the pointer is 152a9e6f83cSMichal Nazarewicz * valid) and sets the pointer to READ_BUFFER_DROP value. This special 153a9e6f83cSMichal Nazarewicz * value is crux of the synchronisation between ffs_func_eps_disable and 154a9e6f83cSMichal Nazarewicz * __ffs_epfile_read_data. 155a9e6f83cSMichal Nazarewicz * 156a9e6f83cSMichal Nazarewicz * Once __ffs_epfile_read_data is about to finish it will try to set the 157a9e6f83cSMichal Nazarewicz * pointer back to its old value (as described above), but seeing as the 158a9e6f83cSMichal Nazarewicz * pointer is not-NULL (namely READ_BUFFER_DROP) it will instead free 159a9e6f83cSMichal Nazarewicz * the buffer. 160a9e6f83cSMichal Nazarewicz * 161a9e6f83cSMichal Nazarewicz * == State transitions == 162a9e6f83cSMichal Nazarewicz * 163a9e6f83cSMichal Nazarewicz * • ptr == NULL: (initial state) 164a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP 165a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffered: nop 166a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_data allocates temp buffer: go to ptr == buf 167a9e6f83cSMichal Nazarewicz * ◦ reading finishes: n/a, not in ‘and reading’ state 168a9e6f83cSMichal Nazarewicz * • ptr == DROP: 169a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffer_free: nop 170a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffered: go to ptr == NULL 171a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_data allocates temp buffer: free buf, nop 172a9e6f83cSMichal Nazarewicz * ◦ reading finishes: n/a, not in ‘and reading’ state 173a9e6f83cSMichal Nazarewicz * • ptr == buf: 174a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffer_free: free buf, go to ptr == DROP 175a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffered: go to ptr == NULL and reading 176a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_data: n/a, __ffs_epfile_read_buffered 177a9e6f83cSMichal Nazarewicz * is always called first 178a9e6f83cSMichal Nazarewicz * ◦ reading finishes: n/a, not in ‘and reading’ state 179a9e6f83cSMichal Nazarewicz * • ptr == NULL and reading: 180a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffer_free: go to ptr == DROP and reading 181a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffered: n/a, mutex is held 182a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_data: n/a, mutex is held 183a9e6f83cSMichal Nazarewicz * ◦ reading finishes and … 184a9e6f83cSMichal Nazarewicz * … all data read: free buf, go to ptr == NULL 185a9e6f83cSMichal Nazarewicz * … otherwise: go to ptr == buf and reading 186a9e6f83cSMichal Nazarewicz * • ptr == DROP and reading: 187a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffer_free: nop 188a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_buffered: n/a, mutex is held 189a9e6f83cSMichal Nazarewicz * ◦ __ffs_epfile_read_data: n/a, mutex is held 190a9e6f83cSMichal Nazarewicz * ◦ reading finishes: free buf, go to ptr == DROP 1919353afbbSMichal Nazarewicz */ 192a9e6f83cSMichal Nazarewicz struct ffs_buffer *read_buffer; 193a9e6f83cSMichal Nazarewicz #define READ_BUFFER_DROP ((struct ffs_buffer *)ERR_PTR(-ESHUTDOWN)) 1949353afbbSMichal Nazarewicz 19500a2430fSAndrzej Pietrasiewicz char name[5]; 19600a2430fSAndrzej Pietrasiewicz 19700a2430fSAndrzej Pietrasiewicz unsigned char in; /* P: ffs->eps_lock */ 19800a2430fSAndrzej Pietrasiewicz unsigned char isoc; /* P: ffs->eps_lock */ 19900a2430fSAndrzej Pietrasiewicz 20000a2430fSAndrzej Pietrasiewicz unsigned char _pad; 20100a2430fSAndrzej Pietrasiewicz }; 20200a2430fSAndrzej Pietrasiewicz 2039353afbbSMichal Nazarewicz struct ffs_buffer { 2049353afbbSMichal Nazarewicz size_t length; 2059353afbbSMichal Nazarewicz char *data; 2069353afbbSMichal Nazarewicz char storage[]; 2079353afbbSMichal Nazarewicz }; 2089353afbbSMichal Nazarewicz 20900a2430fSAndrzej Pietrasiewicz /* ffs_io_data structure ***************************************************/ 21000a2430fSAndrzej Pietrasiewicz 21100a2430fSAndrzej Pietrasiewicz struct ffs_io_data { 21200a2430fSAndrzej Pietrasiewicz bool aio; 21300a2430fSAndrzej Pietrasiewicz bool read; 21400a2430fSAndrzej Pietrasiewicz 21500a2430fSAndrzej Pietrasiewicz struct kiocb *kiocb; 216c993c39bSAl Viro struct iov_iter data; 217c993c39bSAl Viro const void *to_free; 218c993c39bSAl Viro char *buf; 21900a2430fSAndrzej Pietrasiewicz 22000a2430fSAndrzej Pietrasiewicz struct mm_struct *mm; 22100a2430fSAndrzej Pietrasiewicz struct work_struct work; 22200a2430fSAndrzej Pietrasiewicz 22300a2430fSAndrzej Pietrasiewicz struct usb_ep *ep; 22400a2430fSAndrzej Pietrasiewicz struct usb_request *req; 225772a7a72SAndrzej Pietrasiewicz struct sg_table sgt; 226772a7a72SAndrzej Pietrasiewicz bool use_sg; 2275e33f6fdSRobert Baldyga 2285e33f6fdSRobert Baldyga struct ffs_data *ffs; 22900a2430fSAndrzej Pietrasiewicz }; 23000a2430fSAndrzej Pietrasiewicz 2316d5c1c77SRobert Baldyga struct ffs_desc_helper { 2326d5c1c77SRobert Baldyga struct ffs_data *ffs; 2336d5c1c77SRobert Baldyga unsigned interfaces_count; 2346d5c1c77SRobert Baldyga unsigned eps_count; 2356d5c1c77SRobert Baldyga }; 2366d5c1c77SRobert Baldyga 23700a2430fSAndrzej Pietrasiewicz static int __must_check ffs_epfiles_create(struct ffs_data *ffs); 23800a2430fSAndrzej Pietrasiewicz static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count); 23900a2430fSAndrzej Pietrasiewicz 2401bb27cacSAl Viro static struct dentry * 24100a2430fSAndrzej Pietrasiewicz ffs_sb_create_file(struct super_block *sb, const char *name, void *data, 2421bb27cacSAl Viro const struct file_operations *fops); 24300a2430fSAndrzej Pietrasiewicz 24400a2430fSAndrzej Pietrasiewicz /* Devices management *******************************************************/ 24500a2430fSAndrzej Pietrasiewicz 24600a2430fSAndrzej Pietrasiewicz DEFINE_MUTEX(ffs_lock); 24700a2430fSAndrzej Pietrasiewicz EXPORT_SYMBOL_GPL(ffs_lock); 24800a2430fSAndrzej Pietrasiewicz 24900a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_find_dev(const char *name); 25000a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_alloc_dev(void); 25100a2430fSAndrzej Pietrasiewicz static void _ffs_free_dev(struct ffs_dev *dev); 25200a2430fSAndrzej Pietrasiewicz static void *ffs_acquire_dev(const char *dev_name); 25300a2430fSAndrzej Pietrasiewicz static void ffs_release_dev(struct ffs_data *ffs_data); 25400a2430fSAndrzej Pietrasiewicz static int ffs_ready(struct ffs_data *ffs); 25500a2430fSAndrzej Pietrasiewicz static void ffs_closed(struct ffs_data *ffs); 25600a2430fSAndrzej Pietrasiewicz 25700a2430fSAndrzej Pietrasiewicz /* Misc helper functions ****************************************************/ 25800a2430fSAndrzej Pietrasiewicz 25900a2430fSAndrzej Pietrasiewicz static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) 26000a2430fSAndrzej Pietrasiewicz __attribute__((warn_unused_result, nonnull)); 26100a2430fSAndrzej Pietrasiewicz static char *ffs_prepare_buffer(const char __user *buf, size_t len) 26200a2430fSAndrzej Pietrasiewicz __attribute__((warn_unused_result, nonnull)); 26300a2430fSAndrzej Pietrasiewicz 26400a2430fSAndrzej Pietrasiewicz 26500a2430fSAndrzej Pietrasiewicz /* Control file aka ep0 *****************************************************/ 26600a2430fSAndrzej Pietrasiewicz 26700a2430fSAndrzej Pietrasiewicz static void ffs_ep0_complete(struct usb_ep *ep, struct usb_request *req) 26800a2430fSAndrzej Pietrasiewicz { 26900a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = req->context; 27000a2430fSAndrzej Pietrasiewicz 2715bdcde90SDaniel Wagner complete(&ffs->ep0req_completion); 27200a2430fSAndrzej Pietrasiewicz } 27300a2430fSAndrzej Pietrasiewicz 27400a2430fSAndrzej Pietrasiewicz static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) 275c40619bbSVincent Pelletier __releases(&ffs->ev.waitq.lock) 27600a2430fSAndrzej Pietrasiewicz { 27700a2430fSAndrzej Pietrasiewicz struct usb_request *req = ffs->ep0req; 27800a2430fSAndrzej Pietrasiewicz int ret; 27900a2430fSAndrzej Pietrasiewicz 28000a2430fSAndrzej Pietrasiewicz req->zero = len < le16_to_cpu(ffs->ev.setup.wLength); 28100a2430fSAndrzej Pietrasiewicz 28200a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 28300a2430fSAndrzej Pietrasiewicz 28400a2430fSAndrzej Pietrasiewicz req->buf = data; 28500a2430fSAndrzej Pietrasiewicz req->length = len; 28600a2430fSAndrzej Pietrasiewicz 28700a2430fSAndrzej Pietrasiewicz /* 28800a2430fSAndrzej Pietrasiewicz * UDC layer requires to provide a buffer even for ZLP, but should 28900a2430fSAndrzej Pietrasiewicz * not use it at all. Let's provide some poisoned pointer to catch 29000a2430fSAndrzej Pietrasiewicz * possible bug in the driver. 29100a2430fSAndrzej Pietrasiewicz */ 29200a2430fSAndrzej Pietrasiewicz if (req->buf == NULL) 29300a2430fSAndrzej Pietrasiewicz req->buf = (void *)0xDEADBABE; 29400a2430fSAndrzej Pietrasiewicz 29500a2430fSAndrzej Pietrasiewicz reinit_completion(&ffs->ep0req_completion); 29600a2430fSAndrzej Pietrasiewicz 29700a2430fSAndrzej Pietrasiewicz ret = usb_ep_queue(ffs->gadget->ep0, req, GFP_ATOMIC); 29800a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 29900a2430fSAndrzej Pietrasiewicz return ret; 30000a2430fSAndrzej Pietrasiewicz 30100a2430fSAndrzej Pietrasiewicz ret = wait_for_completion_interruptible(&ffs->ep0req_completion); 30200a2430fSAndrzej Pietrasiewicz if (unlikely(ret)) { 30300a2430fSAndrzej Pietrasiewicz usb_ep_dequeue(ffs->gadget->ep0, req); 30400a2430fSAndrzej Pietrasiewicz return -EINTR; 30500a2430fSAndrzej Pietrasiewicz } 30600a2430fSAndrzej Pietrasiewicz 30700a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_NO_SETUP; 30800a2430fSAndrzej Pietrasiewicz return req->status ? req->status : req->actual; 30900a2430fSAndrzej Pietrasiewicz } 31000a2430fSAndrzej Pietrasiewicz 31100a2430fSAndrzej Pietrasiewicz static int __ffs_ep0_stall(struct ffs_data *ffs) 31200a2430fSAndrzej Pietrasiewicz { 31300a2430fSAndrzej Pietrasiewicz if (ffs->ev.can_stall) { 31400a2430fSAndrzej Pietrasiewicz pr_vdebug("ep0 stall\n"); 31500a2430fSAndrzej Pietrasiewicz usb_ep_set_halt(ffs->gadget->ep0); 31600a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_NO_SETUP; 31700a2430fSAndrzej Pietrasiewicz return -EL2HLT; 31800a2430fSAndrzej Pietrasiewicz } else { 31900a2430fSAndrzej Pietrasiewicz pr_debug("bogus ep0 stall!\n"); 32000a2430fSAndrzej Pietrasiewicz return -ESRCH; 32100a2430fSAndrzej Pietrasiewicz } 32200a2430fSAndrzej Pietrasiewicz } 32300a2430fSAndrzej Pietrasiewicz 32400a2430fSAndrzej Pietrasiewicz static ssize_t ffs_ep0_write(struct file *file, const char __user *buf, 32500a2430fSAndrzej Pietrasiewicz size_t len, loff_t *ptr) 32600a2430fSAndrzej Pietrasiewicz { 32700a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 32800a2430fSAndrzej Pietrasiewicz ssize_t ret; 32900a2430fSAndrzej Pietrasiewicz char *data; 33000a2430fSAndrzej Pietrasiewicz 33100a2430fSAndrzej Pietrasiewicz ENTER(); 33200a2430fSAndrzej Pietrasiewicz 33300a2430fSAndrzej Pietrasiewicz /* Fast check if setup was canceled */ 33400a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) 33500a2430fSAndrzej Pietrasiewicz return -EIDRM; 33600a2430fSAndrzej Pietrasiewicz 33700a2430fSAndrzej Pietrasiewicz /* Acquire mutex */ 33800a2430fSAndrzej Pietrasiewicz ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); 33900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 34000a2430fSAndrzej Pietrasiewicz return ret; 34100a2430fSAndrzej Pietrasiewicz 34200a2430fSAndrzej Pietrasiewicz /* Check state */ 34300a2430fSAndrzej Pietrasiewicz switch (ffs->state) { 34400a2430fSAndrzej Pietrasiewicz case FFS_READ_DESCRIPTORS: 34500a2430fSAndrzej Pietrasiewicz case FFS_READ_STRINGS: 34600a2430fSAndrzej Pietrasiewicz /* Copy data */ 34700a2430fSAndrzej Pietrasiewicz if (unlikely(len < 16)) { 34800a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 34900a2430fSAndrzej Pietrasiewicz break; 35000a2430fSAndrzej Pietrasiewicz } 35100a2430fSAndrzej Pietrasiewicz 35200a2430fSAndrzej Pietrasiewicz data = ffs_prepare_buffer(buf, len); 35300a2430fSAndrzej Pietrasiewicz if (IS_ERR(data)) { 35400a2430fSAndrzej Pietrasiewicz ret = PTR_ERR(data); 35500a2430fSAndrzej Pietrasiewicz break; 35600a2430fSAndrzej Pietrasiewicz } 35700a2430fSAndrzej Pietrasiewicz 35800a2430fSAndrzej Pietrasiewicz /* Handle data */ 35900a2430fSAndrzej Pietrasiewicz if (ffs->state == FFS_READ_DESCRIPTORS) { 36000a2430fSAndrzej Pietrasiewicz pr_info("read descriptors\n"); 36100a2430fSAndrzej Pietrasiewicz ret = __ffs_data_got_descs(ffs, data, len); 36200a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 36300a2430fSAndrzej Pietrasiewicz break; 36400a2430fSAndrzej Pietrasiewicz 36500a2430fSAndrzej Pietrasiewicz ffs->state = FFS_READ_STRINGS; 36600a2430fSAndrzej Pietrasiewicz ret = len; 36700a2430fSAndrzej Pietrasiewicz } else { 36800a2430fSAndrzej Pietrasiewicz pr_info("read strings\n"); 36900a2430fSAndrzej Pietrasiewicz ret = __ffs_data_got_strings(ffs, data, len); 37000a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 37100a2430fSAndrzej Pietrasiewicz break; 37200a2430fSAndrzej Pietrasiewicz 37300a2430fSAndrzej Pietrasiewicz ret = ffs_epfiles_create(ffs); 37400a2430fSAndrzej Pietrasiewicz if (unlikely(ret)) { 37500a2430fSAndrzej Pietrasiewicz ffs->state = FFS_CLOSING; 37600a2430fSAndrzej Pietrasiewicz break; 37700a2430fSAndrzej Pietrasiewicz } 37800a2430fSAndrzej Pietrasiewicz 37900a2430fSAndrzej Pietrasiewicz ffs->state = FFS_ACTIVE; 38000a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 38100a2430fSAndrzej Pietrasiewicz 38200a2430fSAndrzej Pietrasiewicz ret = ffs_ready(ffs); 38300a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 38400a2430fSAndrzej Pietrasiewicz ffs->state = FFS_CLOSING; 38500a2430fSAndrzej Pietrasiewicz return ret; 38600a2430fSAndrzej Pietrasiewicz } 38700a2430fSAndrzej Pietrasiewicz 38800a2430fSAndrzej Pietrasiewicz return len; 38900a2430fSAndrzej Pietrasiewicz } 39000a2430fSAndrzej Pietrasiewicz break; 39100a2430fSAndrzej Pietrasiewicz 39200a2430fSAndrzej Pietrasiewicz case FFS_ACTIVE: 39300a2430fSAndrzej Pietrasiewicz data = NULL; 39400a2430fSAndrzej Pietrasiewicz /* 39500a2430fSAndrzej Pietrasiewicz * We're called from user space, we can use _irq 39600a2430fSAndrzej Pietrasiewicz * rather then _irqsave 39700a2430fSAndrzej Pietrasiewicz */ 39800a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 39900a2430fSAndrzej Pietrasiewicz switch (ffs_setup_state_clear_cancelled(ffs)) { 40000a2430fSAndrzej Pietrasiewicz case FFS_SETUP_CANCELLED: 40100a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 40200a2430fSAndrzej Pietrasiewicz goto done_spin; 40300a2430fSAndrzej Pietrasiewicz 40400a2430fSAndrzej Pietrasiewicz case FFS_NO_SETUP: 40500a2430fSAndrzej Pietrasiewicz ret = -ESRCH; 40600a2430fSAndrzej Pietrasiewicz goto done_spin; 40700a2430fSAndrzej Pietrasiewicz 40800a2430fSAndrzej Pietrasiewicz case FFS_SETUP_PENDING: 40900a2430fSAndrzej Pietrasiewicz break; 41000a2430fSAndrzej Pietrasiewicz } 41100a2430fSAndrzej Pietrasiewicz 41200a2430fSAndrzej Pietrasiewicz /* FFS_SETUP_PENDING */ 41300a2430fSAndrzej Pietrasiewicz if (!(ffs->ev.setup.bRequestType & USB_DIR_IN)) { 41400a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 41500a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_stall(ffs); 41600a2430fSAndrzej Pietrasiewicz break; 41700a2430fSAndrzej Pietrasiewicz } 41800a2430fSAndrzej Pietrasiewicz 41900a2430fSAndrzej Pietrasiewicz /* FFS_SETUP_PENDING and not stall */ 42000a2430fSAndrzej Pietrasiewicz len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); 42100a2430fSAndrzej Pietrasiewicz 42200a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 42300a2430fSAndrzej Pietrasiewicz 42400a2430fSAndrzej Pietrasiewicz data = ffs_prepare_buffer(buf, len); 42500a2430fSAndrzej Pietrasiewicz if (IS_ERR(data)) { 42600a2430fSAndrzej Pietrasiewicz ret = PTR_ERR(data); 42700a2430fSAndrzej Pietrasiewicz break; 42800a2430fSAndrzej Pietrasiewicz } 42900a2430fSAndrzej Pietrasiewicz 43000a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 43100a2430fSAndrzej Pietrasiewicz 43200a2430fSAndrzej Pietrasiewicz /* 43300a2430fSAndrzej Pietrasiewicz * We are guaranteed to be still in FFS_ACTIVE state 43400a2430fSAndrzej Pietrasiewicz * but the state of setup could have changed from 43500a2430fSAndrzej Pietrasiewicz * FFS_SETUP_PENDING to FFS_SETUP_CANCELLED so we need 43600a2430fSAndrzej Pietrasiewicz * to check for that. If that happened we copied data 43700a2430fSAndrzej Pietrasiewicz * from user space in vain but it's unlikely. 43800a2430fSAndrzej Pietrasiewicz * 43900a2430fSAndrzej Pietrasiewicz * For sure we are not in FFS_NO_SETUP since this is 44000a2430fSAndrzej Pietrasiewicz * the only place FFS_SETUP_PENDING -> FFS_NO_SETUP 44100a2430fSAndrzej Pietrasiewicz * transition can be performed and it's protected by 44200a2430fSAndrzej Pietrasiewicz * mutex. 44300a2430fSAndrzej Pietrasiewicz */ 44400a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == 44500a2430fSAndrzej Pietrasiewicz FFS_SETUP_CANCELLED) { 44600a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 44700a2430fSAndrzej Pietrasiewicz done_spin: 44800a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 44900a2430fSAndrzej Pietrasiewicz } else { 45000a2430fSAndrzej Pietrasiewicz /* unlocks spinlock */ 45100a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_queue_wait(ffs, data, len); 45200a2430fSAndrzej Pietrasiewicz } 45300a2430fSAndrzej Pietrasiewicz kfree(data); 45400a2430fSAndrzej Pietrasiewicz break; 45500a2430fSAndrzej Pietrasiewicz 45600a2430fSAndrzej Pietrasiewicz default: 45700a2430fSAndrzej Pietrasiewicz ret = -EBADFD; 45800a2430fSAndrzej Pietrasiewicz break; 45900a2430fSAndrzej Pietrasiewicz } 46000a2430fSAndrzej Pietrasiewicz 46100a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 46200a2430fSAndrzej Pietrasiewicz return ret; 46300a2430fSAndrzej Pietrasiewicz } 46400a2430fSAndrzej Pietrasiewicz 46567913bbdSMichal Nazarewicz /* Called with ffs->ev.waitq.lock and ffs->mutex held, both released on exit. */ 46600a2430fSAndrzej Pietrasiewicz static ssize_t __ffs_ep0_read_events(struct ffs_data *ffs, char __user *buf, 46700a2430fSAndrzej Pietrasiewicz size_t n) 468c40619bbSVincent Pelletier __releases(&ffs->ev.waitq.lock) 46900a2430fSAndrzej Pietrasiewicz { 47000a2430fSAndrzej Pietrasiewicz /* 47167913bbdSMichal Nazarewicz * n cannot be bigger than ffs->ev.count, which cannot be bigger than 47267913bbdSMichal Nazarewicz * size of ffs->ev.types array (which is four) so that's how much space 47367913bbdSMichal Nazarewicz * we reserve. 47400a2430fSAndrzej Pietrasiewicz */ 47567913bbdSMichal Nazarewicz struct usb_functionfs_event events[ARRAY_SIZE(ffs->ev.types)]; 47667913bbdSMichal Nazarewicz const size_t size = n * sizeof *events; 47700a2430fSAndrzej Pietrasiewicz unsigned i = 0; 47800a2430fSAndrzej Pietrasiewicz 47967913bbdSMichal Nazarewicz memset(events, 0, size); 48000a2430fSAndrzej Pietrasiewicz 48100a2430fSAndrzej Pietrasiewicz do { 48200a2430fSAndrzej Pietrasiewicz events[i].type = ffs->ev.types[i]; 48300a2430fSAndrzej Pietrasiewicz if (events[i].type == FUNCTIONFS_SETUP) { 48400a2430fSAndrzej Pietrasiewicz events[i].u.setup = ffs->ev.setup; 48500a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_SETUP_PENDING; 48600a2430fSAndrzej Pietrasiewicz } 48700a2430fSAndrzej Pietrasiewicz } while (++i < n); 48800a2430fSAndrzej Pietrasiewicz 48900a2430fSAndrzej Pietrasiewicz ffs->ev.count -= n; 49067913bbdSMichal Nazarewicz if (ffs->ev.count) 49100a2430fSAndrzej Pietrasiewicz memmove(ffs->ev.types, ffs->ev.types + n, 49200a2430fSAndrzej Pietrasiewicz ffs->ev.count * sizeof *ffs->ev.types); 49300a2430fSAndrzej Pietrasiewicz 49400a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 49500a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 49600a2430fSAndrzej Pietrasiewicz 4977fe9a937SDaniel Walter return unlikely(copy_to_user(buf, events, size)) ? -EFAULT : size; 49800a2430fSAndrzej Pietrasiewicz } 49900a2430fSAndrzej Pietrasiewicz 50000a2430fSAndrzej Pietrasiewicz static ssize_t ffs_ep0_read(struct file *file, char __user *buf, 50100a2430fSAndrzej Pietrasiewicz size_t len, loff_t *ptr) 50200a2430fSAndrzej Pietrasiewicz { 50300a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 50400a2430fSAndrzej Pietrasiewicz char *data = NULL; 50500a2430fSAndrzej Pietrasiewicz size_t n; 50600a2430fSAndrzej Pietrasiewicz int ret; 50700a2430fSAndrzej Pietrasiewicz 50800a2430fSAndrzej Pietrasiewicz ENTER(); 50900a2430fSAndrzej Pietrasiewicz 51000a2430fSAndrzej Pietrasiewicz /* Fast check if setup was canceled */ 51100a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == FFS_SETUP_CANCELLED) 51200a2430fSAndrzej Pietrasiewicz return -EIDRM; 51300a2430fSAndrzej Pietrasiewicz 51400a2430fSAndrzej Pietrasiewicz /* Acquire mutex */ 51500a2430fSAndrzej Pietrasiewicz ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); 51600a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 51700a2430fSAndrzej Pietrasiewicz return ret; 51800a2430fSAndrzej Pietrasiewicz 51900a2430fSAndrzej Pietrasiewicz /* Check state */ 52000a2430fSAndrzej Pietrasiewicz if (ffs->state != FFS_ACTIVE) { 52100a2430fSAndrzej Pietrasiewicz ret = -EBADFD; 52200a2430fSAndrzej Pietrasiewicz goto done_mutex; 52300a2430fSAndrzej Pietrasiewicz } 52400a2430fSAndrzej Pietrasiewicz 52500a2430fSAndrzej Pietrasiewicz /* 52600a2430fSAndrzej Pietrasiewicz * We're called from user space, we can use _irq rather then 52700a2430fSAndrzej Pietrasiewicz * _irqsave 52800a2430fSAndrzej Pietrasiewicz */ 52900a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 53000a2430fSAndrzej Pietrasiewicz 53100a2430fSAndrzej Pietrasiewicz switch (ffs_setup_state_clear_cancelled(ffs)) { 53200a2430fSAndrzej Pietrasiewicz case FFS_SETUP_CANCELLED: 53300a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 53400a2430fSAndrzej Pietrasiewicz break; 53500a2430fSAndrzej Pietrasiewicz 53600a2430fSAndrzej Pietrasiewicz case FFS_NO_SETUP: 53700a2430fSAndrzej Pietrasiewicz n = len / sizeof(struct usb_functionfs_event); 53800a2430fSAndrzej Pietrasiewicz if (unlikely(!n)) { 53900a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 54000a2430fSAndrzej Pietrasiewicz break; 54100a2430fSAndrzej Pietrasiewicz } 54200a2430fSAndrzej Pietrasiewicz 54300a2430fSAndrzej Pietrasiewicz if ((file->f_flags & O_NONBLOCK) && !ffs->ev.count) { 54400a2430fSAndrzej Pietrasiewicz ret = -EAGAIN; 54500a2430fSAndrzej Pietrasiewicz break; 54600a2430fSAndrzej Pietrasiewicz } 54700a2430fSAndrzej Pietrasiewicz 54800a2430fSAndrzej Pietrasiewicz if (wait_event_interruptible_exclusive_locked_irq(ffs->ev.waitq, 54900a2430fSAndrzej Pietrasiewicz ffs->ev.count)) { 55000a2430fSAndrzej Pietrasiewicz ret = -EINTR; 55100a2430fSAndrzej Pietrasiewicz break; 55200a2430fSAndrzej Pietrasiewicz } 55300a2430fSAndrzej Pietrasiewicz 554c40619bbSVincent Pelletier /* unlocks spinlock */ 55500a2430fSAndrzej Pietrasiewicz return __ffs_ep0_read_events(ffs, buf, 55600a2430fSAndrzej Pietrasiewicz min(n, (size_t)ffs->ev.count)); 55700a2430fSAndrzej Pietrasiewicz 55800a2430fSAndrzej Pietrasiewicz case FFS_SETUP_PENDING: 55900a2430fSAndrzej Pietrasiewicz if (ffs->ev.setup.bRequestType & USB_DIR_IN) { 56000a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 56100a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_stall(ffs); 56200a2430fSAndrzej Pietrasiewicz goto done_mutex; 56300a2430fSAndrzej Pietrasiewicz } 56400a2430fSAndrzej Pietrasiewicz 56500a2430fSAndrzej Pietrasiewicz len = min(len, (size_t)le16_to_cpu(ffs->ev.setup.wLength)); 56600a2430fSAndrzej Pietrasiewicz 56700a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 56800a2430fSAndrzej Pietrasiewicz 56900a2430fSAndrzej Pietrasiewicz if (likely(len)) { 57000a2430fSAndrzej Pietrasiewicz data = kmalloc(len, GFP_KERNEL); 57100a2430fSAndrzej Pietrasiewicz if (unlikely(!data)) { 57200a2430fSAndrzej Pietrasiewicz ret = -ENOMEM; 57300a2430fSAndrzej Pietrasiewicz goto done_mutex; 57400a2430fSAndrzej Pietrasiewicz } 57500a2430fSAndrzej Pietrasiewicz } 57600a2430fSAndrzej Pietrasiewicz 57700a2430fSAndrzej Pietrasiewicz spin_lock_irq(&ffs->ev.waitq.lock); 57800a2430fSAndrzej Pietrasiewicz 57900a2430fSAndrzej Pietrasiewicz /* See ffs_ep0_write() */ 58000a2430fSAndrzej Pietrasiewicz if (ffs_setup_state_clear_cancelled(ffs) == 58100a2430fSAndrzej Pietrasiewicz FFS_SETUP_CANCELLED) { 58200a2430fSAndrzej Pietrasiewicz ret = -EIDRM; 58300a2430fSAndrzej Pietrasiewicz break; 58400a2430fSAndrzej Pietrasiewicz } 58500a2430fSAndrzej Pietrasiewicz 58600a2430fSAndrzej Pietrasiewicz /* unlocks spinlock */ 58700a2430fSAndrzej Pietrasiewicz ret = __ffs_ep0_queue_wait(ffs, data, len); 5887fe9a937SDaniel Walter if (likely(ret > 0) && unlikely(copy_to_user(buf, data, len))) 58900a2430fSAndrzej Pietrasiewicz ret = -EFAULT; 59000a2430fSAndrzej Pietrasiewicz goto done_mutex; 59100a2430fSAndrzej Pietrasiewicz 59200a2430fSAndrzej Pietrasiewicz default: 59300a2430fSAndrzej Pietrasiewicz ret = -EBADFD; 59400a2430fSAndrzej Pietrasiewicz break; 59500a2430fSAndrzej Pietrasiewicz } 59600a2430fSAndrzej Pietrasiewicz 59700a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&ffs->ev.waitq.lock); 59800a2430fSAndrzej Pietrasiewicz done_mutex: 59900a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 60000a2430fSAndrzej Pietrasiewicz kfree(data); 60100a2430fSAndrzej Pietrasiewicz return ret; 60200a2430fSAndrzej Pietrasiewicz } 60300a2430fSAndrzej Pietrasiewicz 60400a2430fSAndrzej Pietrasiewicz static int ffs_ep0_open(struct inode *inode, struct file *file) 60500a2430fSAndrzej Pietrasiewicz { 60600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = inode->i_private; 60700a2430fSAndrzej Pietrasiewicz 60800a2430fSAndrzej Pietrasiewicz ENTER(); 60900a2430fSAndrzej Pietrasiewicz 61000a2430fSAndrzej Pietrasiewicz if (unlikely(ffs->state == FFS_CLOSING)) 61100a2430fSAndrzej Pietrasiewicz return -EBUSY; 61200a2430fSAndrzej Pietrasiewicz 61300a2430fSAndrzej Pietrasiewicz file->private_data = ffs; 61400a2430fSAndrzej Pietrasiewicz ffs_data_opened(ffs); 61500a2430fSAndrzej Pietrasiewicz 61600a2430fSAndrzej Pietrasiewicz return 0; 61700a2430fSAndrzej Pietrasiewicz } 61800a2430fSAndrzej Pietrasiewicz 61900a2430fSAndrzej Pietrasiewicz static int ffs_ep0_release(struct inode *inode, struct file *file) 62000a2430fSAndrzej Pietrasiewicz { 62100a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 62200a2430fSAndrzej Pietrasiewicz 62300a2430fSAndrzej Pietrasiewicz ENTER(); 62400a2430fSAndrzej Pietrasiewicz 62500a2430fSAndrzej Pietrasiewicz ffs_data_closed(ffs); 62600a2430fSAndrzej Pietrasiewicz 62700a2430fSAndrzej Pietrasiewicz return 0; 62800a2430fSAndrzej Pietrasiewicz } 62900a2430fSAndrzej Pietrasiewicz 63000a2430fSAndrzej Pietrasiewicz static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value) 63100a2430fSAndrzej Pietrasiewicz { 63200a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 63300a2430fSAndrzej Pietrasiewicz struct usb_gadget *gadget = ffs->gadget; 63400a2430fSAndrzej Pietrasiewicz long ret; 63500a2430fSAndrzej Pietrasiewicz 63600a2430fSAndrzej Pietrasiewicz ENTER(); 63700a2430fSAndrzej Pietrasiewicz 63800a2430fSAndrzej Pietrasiewicz if (code == FUNCTIONFS_INTERFACE_REVMAP) { 63900a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs->func; 64000a2430fSAndrzej Pietrasiewicz ret = func ? ffs_func_revmap_intf(func, value) : -ENODEV; 64100a2430fSAndrzej Pietrasiewicz } else if (gadget && gadget->ops->ioctl) { 64200a2430fSAndrzej Pietrasiewicz ret = gadget->ops->ioctl(gadget, code, value); 64300a2430fSAndrzej Pietrasiewicz } else { 64400a2430fSAndrzej Pietrasiewicz ret = -ENOTTY; 64500a2430fSAndrzej Pietrasiewicz } 64600a2430fSAndrzej Pietrasiewicz 64700a2430fSAndrzej Pietrasiewicz return ret; 64800a2430fSAndrzej Pietrasiewicz } 64900a2430fSAndrzej Pietrasiewicz 650afc9a42bSAl Viro static __poll_t ffs_ep0_poll(struct file *file, poll_table *wait) 65100a2430fSAndrzej Pietrasiewicz { 65200a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = file->private_data; 653a9a08845SLinus Torvalds __poll_t mask = EPOLLWRNORM; 65400a2430fSAndrzej Pietrasiewicz int ret; 65500a2430fSAndrzej Pietrasiewicz 65600a2430fSAndrzej Pietrasiewicz poll_wait(file, &ffs->ev.waitq, wait); 65700a2430fSAndrzej Pietrasiewicz 65800a2430fSAndrzej Pietrasiewicz ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK); 65900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 66000a2430fSAndrzej Pietrasiewicz return mask; 66100a2430fSAndrzej Pietrasiewicz 66200a2430fSAndrzej Pietrasiewicz switch (ffs->state) { 66300a2430fSAndrzej Pietrasiewicz case FFS_READ_DESCRIPTORS: 66400a2430fSAndrzej Pietrasiewicz case FFS_READ_STRINGS: 665a9a08845SLinus Torvalds mask |= EPOLLOUT; 66600a2430fSAndrzej Pietrasiewicz break; 66700a2430fSAndrzej Pietrasiewicz 66800a2430fSAndrzej Pietrasiewicz case FFS_ACTIVE: 66900a2430fSAndrzej Pietrasiewicz switch (ffs->setup_state) { 67000a2430fSAndrzej Pietrasiewicz case FFS_NO_SETUP: 67100a2430fSAndrzej Pietrasiewicz if (ffs->ev.count) 672a9a08845SLinus Torvalds mask |= EPOLLIN; 67300a2430fSAndrzej Pietrasiewicz break; 67400a2430fSAndrzej Pietrasiewicz 67500a2430fSAndrzej Pietrasiewicz case FFS_SETUP_PENDING: 67600a2430fSAndrzej Pietrasiewicz case FFS_SETUP_CANCELLED: 677a9a08845SLinus Torvalds mask |= (EPOLLIN | EPOLLOUT); 67800a2430fSAndrzej Pietrasiewicz break; 67900a2430fSAndrzej Pietrasiewicz } 68000a2430fSAndrzej Pietrasiewicz case FFS_CLOSING: 68100a2430fSAndrzej Pietrasiewicz break; 68218d6b32fSRobert Baldyga case FFS_DEACTIVATED: 68318d6b32fSRobert Baldyga break; 68400a2430fSAndrzej Pietrasiewicz } 68500a2430fSAndrzej Pietrasiewicz 68600a2430fSAndrzej Pietrasiewicz mutex_unlock(&ffs->mutex); 68700a2430fSAndrzej Pietrasiewicz 68800a2430fSAndrzej Pietrasiewicz return mask; 68900a2430fSAndrzej Pietrasiewicz } 69000a2430fSAndrzej Pietrasiewicz 69100a2430fSAndrzej Pietrasiewicz static const struct file_operations ffs_ep0_operations = { 69200a2430fSAndrzej Pietrasiewicz .llseek = no_llseek, 69300a2430fSAndrzej Pietrasiewicz 69400a2430fSAndrzej Pietrasiewicz .open = ffs_ep0_open, 69500a2430fSAndrzej Pietrasiewicz .write = ffs_ep0_write, 69600a2430fSAndrzej Pietrasiewicz .read = ffs_ep0_read, 69700a2430fSAndrzej Pietrasiewicz .release = ffs_ep0_release, 69800a2430fSAndrzej Pietrasiewicz .unlocked_ioctl = ffs_ep0_ioctl, 69900a2430fSAndrzej Pietrasiewicz .poll = ffs_ep0_poll, 70000a2430fSAndrzej Pietrasiewicz }; 70100a2430fSAndrzej Pietrasiewicz 70200a2430fSAndrzej Pietrasiewicz 70300a2430fSAndrzej Pietrasiewicz /* "Normal" endpoints operations ********************************************/ 70400a2430fSAndrzej Pietrasiewicz 70500a2430fSAndrzej Pietrasiewicz static void ffs_epfile_io_complete(struct usb_ep *_ep, struct usb_request *req) 70600a2430fSAndrzej Pietrasiewicz { 70700a2430fSAndrzej Pietrasiewicz ENTER(); 70800a2430fSAndrzej Pietrasiewicz if (likely(req->context)) { 70900a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = _ep->driver_data; 71000a2430fSAndrzej Pietrasiewicz ep->status = req->status ? req->status : req->actual; 71100a2430fSAndrzej Pietrasiewicz complete(req->context); 71200a2430fSAndrzej Pietrasiewicz } 71300a2430fSAndrzej Pietrasiewicz } 71400a2430fSAndrzej Pietrasiewicz 715c662a31bSMichal Nazarewicz static ssize_t ffs_copy_to_iter(void *data, int data_len, struct iov_iter *iter) 716c662a31bSMichal Nazarewicz { 717c662a31bSMichal Nazarewicz ssize_t ret = copy_to_iter(data, data_len, iter); 718c662a31bSMichal Nazarewicz if (likely(ret == data_len)) 719c662a31bSMichal Nazarewicz return ret; 720c662a31bSMichal Nazarewicz 721c662a31bSMichal Nazarewicz if (unlikely(iov_iter_count(iter))) 722c662a31bSMichal Nazarewicz return -EFAULT; 723c662a31bSMichal Nazarewicz 724c662a31bSMichal Nazarewicz /* 725c662a31bSMichal Nazarewicz * Dear user space developer! 726c662a31bSMichal Nazarewicz * 727c662a31bSMichal Nazarewicz * TL;DR: To stop getting below error message in your kernel log, change 728c662a31bSMichal Nazarewicz * user space code using functionfs to align read buffers to a max 729c662a31bSMichal Nazarewicz * packet size. 730c662a31bSMichal Nazarewicz * 731c662a31bSMichal Nazarewicz * Some UDCs (e.g. dwc3) require request sizes to be a multiple of a max 732c662a31bSMichal Nazarewicz * packet size. When unaligned buffer is passed to functionfs, it 733c662a31bSMichal Nazarewicz * internally uses a larger, aligned buffer so that such UDCs are happy. 734c662a31bSMichal Nazarewicz * 735c662a31bSMichal Nazarewicz * Unfortunately, this means that host may send more data than was 736c662a31bSMichal Nazarewicz * requested in read(2) system call. f_fs doesn’t know what to do with 737c662a31bSMichal Nazarewicz * that excess data so it simply drops it. 738c662a31bSMichal Nazarewicz * 739c662a31bSMichal Nazarewicz * Was the buffer aligned in the first place, no such problem would 740c662a31bSMichal Nazarewicz * happen. 741c662a31bSMichal Nazarewicz * 7429353afbbSMichal Nazarewicz * Data may be dropped only in AIO reads. Synchronous reads are handled 7439353afbbSMichal Nazarewicz * by splitting a request into multiple parts. This splitting may still 7449353afbbSMichal Nazarewicz * be a problem though so it’s likely best to align the buffer 7459353afbbSMichal Nazarewicz * regardless of it being AIO or not.. 7469353afbbSMichal Nazarewicz * 747c662a31bSMichal Nazarewicz * This only affects OUT endpoints, i.e. reading data with a read(2), 748c662a31bSMichal Nazarewicz * aio_read(2) etc. system calls. Writing data to an IN endpoint is not 749c662a31bSMichal Nazarewicz * affected. 750c662a31bSMichal Nazarewicz */ 751c662a31bSMichal Nazarewicz pr_err("functionfs read size %d > requested size %zd, dropping excess data. " 752c662a31bSMichal Nazarewicz "Align read buffer size to max packet size to avoid the problem.\n", 753c662a31bSMichal Nazarewicz data_len, ret); 754c662a31bSMichal Nazarewicz 755c662a31bSMichal Nazarewicz return ret; 756c662a31bSMichal Nazarewicz } 757c662a31bSMichal Nazarewicz 758772a7a72SAndrzej Pietrasiewicz /* 759772a7a72SAndrzej Pietrasiewicz * allocate a virtually contiguous buffer and create a scatterlist describing it 760772a7a72SAndrzej Pietrasiewicz * @sg_table - pointer to a place to be filled with sg_table contents 761772a7a72SAndrzej Pietrasiewicz * @size - required buffer size 762772a7a72SAndrzej Pietrasiewicz */ 763772a7a72SAndrzej Pietrasiewicz static void *ffs_build_sg_list(struct sg_table *sgt, size_t sz) 764772a7a72SAndrzej Pietrasiewicz { 765772a7a72SAndrzej Pietrasiewicz struct page **pages; 766772a7a72SAndrzej Pietrasiewicz void *vaddr, *ptr; 767772a7a72SAndrzej Pietrasiewicz unsigned int n_pages; 768772a7a72SAndrzej Pietrasiewicz int i; 769772a7a72SAndrzej Pietrasiewicz 770772a7a72SAndrzej Pietrasiewicz vaddr = vmalloc(sz); 771772a7a72SAndrzej Pietrasiewicz if (!vaddr) 772772a7a72SAndrzej Pietrasiewicz return NULL; 773772a7a72SAndrzej Pietrasiewicz 774772a7a72SAndrzej Pietrasiewicz n_pages = PAGE_ALIGN(sz) >> PAGE_SHIFT; 775772a7a72SAndrzej Pietrasiewicz pages = kvmalloc_array(n_pages, sizeof(struct page *), GFP_KERNEL); 776772a7a72SAndrzej Pietrasiewicz if (!pages) { 777772a7a72SAndrzej Pietrasiewicz vfree(vaddr); 778772a7a72SAndrzej Pietrasiewicz 779772a7a72SAndrzej Pietrasiewicz return NULL; 780772a7a72SAndrzej Pietrasiewicz } 781772a7a72SAndrzej Pietrasiewicz for (i = 0, ptr = vaddr; i < n_pages; ++i, ptr += PAGE_SIZE) 782772a7a72SAndrzej Pietrasiewicz pages[i] = vmalloc_to_page(ptr); 783772a7a72SAndrzej Pietrasiewicz 784772a7a72SAndrzej Pietrasiewicz if (sg_alloc_table_from_pages(sgt, pages, n_pages, 0, sz, GFP_KERNEL)) { 785772a7a72SAndrzej Pietrasiewicz kvfree(pages); 786772a7a72SAndrzej Pietrasiewicz vfree(vaddr); 787772a7a72SAndrzej Pietrasiewicz 788772a7a72SAndrzej Pietrasiewicz return NULL; 789772a7a72SAndrzej Pietrasiewicz } 790772a7a72SAndrzej Pietrasiewicz kvfree(pages); 791772a7a72SAndrzej Pietrasiewicz 792772a7a72SAndrzej Pietrasiewicz return vaddr; 793772a7a72SAndrzej Pietrasiewicz } 794772a7a72SAndrzej Pietrasiewicz 795772a7a72SAndrzej Pietrasiewicz static inline void *ffs_alloc_buffer(struct ffs_io_data *io_data, 796772a7a72SAndrzej Pietrasiewicz size_t data_len) 797772a7a72SAndrzej Pietrasiewicz { 798772a7a72SAndrzej Pietrasiewicz if (io_data->use_sg) 799772a7a72SAndrzej Pietrasiewicz return ffs_build_sg_list(&io_data->sgt, data_len); 800772a7a72SAndrzej Pietrasiewicz 801772a7a72SAndrzej Pietrasiewicz return kmalloc(data_len, GFP_KERNEL); 802772a7a72SAndrzej Pietrasiewicz } 803772a7a72SAndrzej Pietrasiewicz 804772a7a72SAndrzej Pietrasiewicz static inline void ffs_free_buffer(struct ffs_io_data *io_data) 805772a7a72SAndrzej Pietrasiewicz { 806772a7a72SAndrzej Pietrasiewicz if (!io_data->buf) 807772a7a72SAndrzej Pietrasiewicz return; 808772a7a72SAndrzej Pietrasiewicz 809772a7a72SAndrzej Pietrasiewicz if (io_data->use_sg) { 810772a7a72SAndrzej Pietrasiewicz sg_free_table(&io_data->sgt); 811772a7a72SAndrzej Pietrasiewicz vfree(io_data->buf); 812772a7a72SAndrzej Pietrasiewicz } else { 813772a7a72SAndrzej Pietrasiewicz kfree(io_data->buf); 814772a7a72SAndrzej Pietrasiewicz } 815772a7a72SAndrzej Pietrasiewicz } 816772a7a72SAndrzej Pietrasiewicz 81700a2430fSAndrzej Pietrasiewicz static void ffs_user_copy_worker(struct work_struct *work) 81800a2430fSAndrzej Pietrasiewicz { 81900a2430fSAndrzej Pietrasiewicz struct ffs_io_data *io_data = container_of(work, struct ffs_io_data, 82000a2430fSAndrzej Pietrasiewicz work); 82100a2430fSAndrzej Pietrasiewicz int ret = io_data->req->status ? io_data->req->status : 82200a2430fSAndrzej Pietrasiewicz io_data->req->actual; 82338740a5bSLars-Peter Clausen bool kiocb_has_eventfd = io_data->kiocb->ki_flags & IOCB_EVENTFD; 82400a2430fSAndrzej Pietrasiewicz 82500a2430fSAndrzej Pietrasiewicz if (io_data->read && ret > 0) { 8264058ebf3SLars-Peter Clausen mm_segment_t oldfs = get_fs(); 8274058ebf3SLars-Peter Clausen 8284058ebf3SLars-Peter Clausen set_fs(USER_DS); 82900a2430fSAndrzej Pietrasiewicz use_mm(io_data->mm); 830c662a31bSMichal Nazarewicz ret = ffs_copy_to_iter(io_data->buf, ret, &io_data->data); 83100a2430fSAndrzej Pietrasiewicz unuse_mm(io_data->mm); 8324058ebf3SLars-Peter Clausen set_fs(oldfs); 83300a2430fSAndrzej Pietrasiewicz } 83400a2430fSAndrzej Pietrasiewicz 83504b2fa9fSChristoph Hellwig io_data->kiocb->ki_complete(io_data->kiocb, ret, ret); 83600a2430fSAndrzej Pietrasiewicz 83738740a5bSLars-Peter Clausen if (io_data->ffs->ffs_eventfd && !kiocb_has_eventfd) 8385e33f6fdSRobert Baldyga eventfd_signal(io_data->ffs->ffs_eventfd, 1); 8395e33f6fdSRobert Baldyga 84000a2430fSAndrzej Pietrasiewicz usb_ep_free_request(io_data->ep, io_data->req); 84100a2430fSAndrzej Pietrasiewicz 84200a2430fSAndrzej Pietrasiewicz if (io_data->read) 843c993c39bSAl Viro kfree(io_data->to_free); 844772a7a72SAndrzej Pietrasiewicz ffs_free_buffer(io_data); 84500a2430fSAndrzej Pietrasiewicz kfree(io_data); 84600a2430fSAndrzej Pietrasiewicz } 84700a2430fSAndrzej Pietrasiewicz 84800a2430fSAndrzej Pietrasiewicz static void ffs_epfile_async_io_complete(struct usb_ep *_ep, 84900a2430fSAndrzej Pietrasiewicz struct usb_request *req) 85000a2430fSAndrzej Pietrasiewicz { 85100a2430fSAndrzej Pietrasiewicz struct ffs_io_data *io_data = req->context; 852addfc582SJohn Keeping struct ffs_data *ffs = io_data->ffs; 85300a2430fSAndrzej Pietrasiewicz 85400a2430fSAndrzej Pietrasiewicz ENTER(); 85500a2430fSAndrzej Pietrasiewicz 85600a2430fSAndrzej Pietrasiewicz INIT_WORK(&io_data->work, ffs_user_copy_worker); 857addfc582SJohn Keeping queue_work(ffs->io_completion_wq, &io_data->work); 85800a2430fSAndrzej Pietrasiewicz } 85900a2430fSAndrzej Pietrasiewicz 860a9e6f83cSMichal Nazarewicz static void __ffs_epfile_read_buffer_free(struct ffs_epfile *epfile) 861a9e6f83cSMichal Nazarewicz { 862a9e6f83cSMichal Nazarewicz /* 863a9e6f83cSMichal Nazarewicz * See comment in struct ffs_epfile for full read_buffer pointer 864a9e6f83cSMichal Nazarewicz * synchronisation story. 865a9e6f83cSMichal Nazarewicz */ 866a9e6f83cSMichal Nazarewicz struct ffs_buffer *buf = xchg(&epfile->read_buffer, READ_BUFFER_DROP); 867a9e6f83cSMichal Nazarewicz if (buf && buf != READ_BUFFER_DROP) 868a9e6f83cSMichal Nazarewicz kfree(buf); 869a9e6f83cSMichal Nazarewicz } 870a9e6f83cSMichal Nazarewicz 8719353afbbSMichal Nazarewicz /* Assumes epfile->mutex is held. */ 8729353afbbSMichal Nazarewicz static ssize_t __ffs_epfile_read_buffered(struct ffs_epfile *epfile, 8739353afbbSMichal Nazarewicz struct iov_iter *iter) 8749353afbbSMichal Nazarewicz { 875a9e6f83cSMichal Nazarewicz /* 876a9e6f83cSMichal Nazarewicz * Null out epfile->read_buffer so ffs_func_eps_disable does not free 877a9e6f83cSMichal Nazarewicz * the buffer while we are using it. See comment in struct ffs_epfile 878a9e6f83cSMichal Nazarewicz * for full read_buffer pointer synchronisation story. 879a9e6f83cSMichal Nazarewicz */ 880a9e6f83cSMichal Nazarewicz struct ffs_buffer *buf = xchg(&epfile->read_buffer, NULL); 8819353afbbSMichal Nazarewicz ssize_t ret; 882a9e6f83cSMichal Nazarewicz if (!buf || buf == READ_BUFFER_DROP) 8839353afbbSMichal Nazarewicz return 0; 8849353afbbSMichal Nazarewicz 8859353afbbSMichal Nazarewicz ret = copy_to_iter(buf->data, buf->length, iter); 8869353afbbSMichal Nazarewicz if (buf->length == ret) { 8879353afbbSMichal Nazarewicz kfree(buf); 888a9e6f83cSMichal Nazarewicz return ret; 889a9e6f83cSMichal Nazarewicz } 890a9e6f83cSMichal Nazarewicz 891a9e6f83cSMichal Nazarewicz if (unlikely(iov_iter_count(iter))) { 8929353afbbSMichal Nazarewicz ret = -EFAULT; 8939353afbbSMichal Nazarewicz } else { 8949353afbbSMichal Nazarewicz buf->length -= ret; 8959353afbbSMichal Nazarewicz buf->data += ret; 8969353afbbSMichal Nazarewicz } 897a9e6f83cSMichal Nazarewicz 898a9e6f83cSMichal Nazarewicz if (cmpxchg(&epfile->read_buffer, NULL, buf)) 899a9e6f83cSMichal Nazarewicz kfree(buf); 900a9e6f83cSMichal Nazarewicz 9019353afbbSMichal Nazarewicz return ret; 9029353afbbSMichal Nazarewicz } 9039353afbbSMichal Nazarewicz 9049353afbbSMichal Nazarewicz /* Assumes epfile->mutex is held. */ 9059353afbbSMichal Nazarewicz static ssize_t __ffs_epfile_read_data(struct ffs_epfile *epfile, 9069353afbbSMichal Nazarewicz void *data, int data_len, 9079353afbbSMichal Nazarewicz struct iov_iter *iter) 9089353afbbSMichal Nazarewicz { 9099353afbbSMichal Nazarewicz struct ffs_buffer *buf; 9109353afbbSMichal Nazarewicz 9119353afbbSMichal Nazarewicz ssize_t ret = copy_to_iter(data, data_len, iter); 9129353afbbSMichal Nazarewicz if (likely(data_len == ret)) 9139353afbbSMichal Nazarewicz return ret; 9149353afbbSMichal Nazarewicz 9159353afbbSMichal Nazarewicz if (unlikely(iov_iter_count(iter))) 9169353afbbSMichal Nazarewicz return -EFAULT; 9179353afbbSMichal Nazarewicz 9189353afbbSMichal Nazarewicz /* See ffs_copy_to_iter for more context. */ 9199353afbbSMichal Nazarewicz pr_warn("functionfs read size %d > requested size %zd, splitting request into multiple reads.", 9209353afbbSMichal Nazarewicz data_len, ret); 9219353afbbSMichal Nazarewicz 9229353afbbSMichal Nazarewicz data_len -= ret; 9239353afbbSMichal Nazarewicz buf = kmalloc(sizeof(*buf) + data_len, GFP_KERNEL); 92444963d64SDan Carpenter if (!buf) 92544963d64SDan Carpenter return -ENOMEM; 9269353afbbSMichal Nazarewicz buf->length = data_len; 9279353afbbSMichal Nazarewicz buf->data = buf->storage; 9289353afbbSMichal Nazarewicz memcpy(buf->storage, data + ret, data_len); 929a9e6f83cSMichal Nazarewicz 930a9e6f83cSMichal Nazarewicz /* 931a9e6f83cSMichal Nazarewicz * At this point read_buffer is NULL or READ_BUFFER_DROP (if 932a9e6f83cSMichal Nazarewicz * ffs_func_eps_disable has been called in the meanwhile). See comment 933a9e6f83cSMichal Nazarewicz * in struct ffs_epfile for full read_buffer pointer synchronisation 934a9e6f83cSMichal Nazarewicz * story. 935a9e6f83cSMichal Nazarewicz */ 936a9e6f83cSMichal Nazarewicz if (unlikely(cmpxchg(&epfile->read_buffer, NULL, buf))) 937a9e6f83cSMichal Nazarewicz kfree(buf); 9389353afbbSMichal Nazarewicz 9399353afbbSMichal Nazarewicz return ret; 9409353afbbSMichal Nazarewicz } 9419353afbbSMichal Nazarewicz 94200a2430fSAndrzej Pietrasiewicz static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) 94300a2430fSAndrzej Pietrasiewicz { 94400a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = file->private_data; 945ae76e134SMichal Nazarewicz struct usb_request *req; 94600a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep; 94700a2430fSAndrzej Pietrasiewicz char *data = NULL; 948c0d31b3cSDavid Cohen ssize_t ret, data_len = -EINVAL; 94900a2430fSAndrzej Pietrasiewicz int halt; 95000a2430fSAndrzej Pietrasiewicz 95100a2430fSAndrzej Pietrasiewicz /* Are we still active? */ 952b3591f67SMichal Nazarewicz if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) 953b3591f67SMichal Nazarewicz return -ENODEV; 95400a2430fSAndrzej Pietrasiewicz 95500a2430fSAndrzej Pietrasiewicz /* Wait for endpoint to be enabled */ 95600a2430fSAndrzej Pietrasiewicz ep = epfile->ep; 95700a2430fSAndrzej Pietrasiewicz if (!ep) { 958b3591f67SMichal Nazarewicz if (file->f_flags & O_NONBLOCK) 959b3591f67SMichal Nazarewicz return -EAGAIN; 96000a2430fSAndrzej Pietrasiewicz 961e16828cfSJerry Zhang ret = wait_event_interruptible( 962e16828cfSJerry Zhang epfile->ffs->wait, (ep = epfile->ep)); 963b3591f67SMichal Nazarewicz if (ret) 964b3591f67SMichal Nazarewicz return -EINTR; 96500a2430fSAndrzej Pietrasiewicz } 96600a2430fSAndrzej Pietrasiewicz 96700a2430fSAndrzej Pietrasiewicz /* Do we halt? */ 96800a2430fSAndrzej Pietrasiewicz halt = (!io_data->read == !epfile->in); 969b3591f67SMichal Nazarewicz if (halt && epfile->isoc) 970b3591f67SMichal Nazarewicz return -EINVAL; 97100a2430fSAndrzej Pietrasiewicz 9729353afbbSMichal Nazarewicz /* We will be using request and read_buffer */ 9739353afbbSMichal Nazarewicz ret = ffs_mutex_lock(&epfile->mutex, file->f_flags & O_NONBLOCK); 9749353afbbSMichal Nazarewicz if (unlikely(ret)) 9759353afbbSMichal Nazarewicz goto error; 9769353afbbSMichal Nazarewicz 97700a2430fSAndrzej Pietrasiewicz /* Allocate & copy */ 97800a2430fSAndrzej Pietrasiewicz if (!halt) { 9799353afbbSMichal Nazarewicz struct usb_gadget *gadget; 9809353afbbSMichal Nazarewicz 9819353afbbSMichal Nazarewicz /* 9829353afbbSMichal Nazarewicz * Do we have buffered data from previous partial read? Check 9839353afbbSMichal Nazarewicz * that for synchronous case only because we do not have 9849353afbbSMichal Nazarewicz * facility to ‘wake up’ a pending asynchronous read and push 9859353afbbSMichal Nazarewicz * buffered data to it which we would need to make things behave 9869353afbbSMichal Nazarewicz * consistently. 9879353afbbSMichal Nazarewicz */ 9889353afbbSMichal Nazarewicz if (!io_data->aio && io_data->read) { 9899353afbbSMichal Nazarewicz ret = __ffs_epfile_read_buffered(epfile, &io_data->data); 9909353afbbSMichal Nazarewicz if (ret) 9919353afbbSMichal Nazarewicz goto error_mutex; 9929353afbbSMichal Nazarewicz } 9939353afbbSMichal Nazarewicz 99400a2430fSAndrzej Pietrasiewicz /* 99500a2430fSAndrzej Pietrasiewicz * if we _do_ wait above, the epfile->ffs->gadget might be NULL 996ae76e134SMichal Nazarewicz * before the waiting completes, so do not assign to 'gadget' 997ae76e134SMichal Nazarewicz * earlier 99800a2430fSAndrzej Pietrasiewicz */ 9999353afbbSMichal Nazarewicz gadget = epfile->ffs->gadget; 100000a2430fSAndrzej Pietrasiewicz 100100a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 100200a2430fSAndrzej Pietrasiewicz /* In the meantime, endpoint got disabled or changed. */ 100300a2430fSAndrzej Pietrasiewicz if (epfile->ep != ep) { 10049353afbbSMichal Nazarewicz ret = -ESHUTDOWN; 10059353afbbSMichal Nazarewicz goto error_lock; 100600a2430fSAndrzej Pietrasiewicz } 1007c993c39bSAl Viro data_len = iov_iter_count(&io_data->data); 100800a2430fSAndrzej Pietrasiewicz /* 100900a2430fSAndrzej Pietrasiewicz * Controller may require buffer size to be aligned to 101000a2430fSAndrzej Pietrasiewicz * maxpacketsize of an out endpoint. 101100a2430fSAndrzej Pietrasiewicz */ 1012c993c39bSAl Viro if (io_data->read) 1013c993c39bSAl Viro data_len = usb_ep_align_maybe(gadget, ep->ep, data_len); 10144833a94eSFei Yang 10154833a94eSFei Yang io_data->use_sg = gadget->sg_supported && data_len > PAGE_SIZE; 101600a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 101700a2430fSAndrzej Pietrasiewicz 1018772a7a72SAndrzej Pietrasiewicz data = ffs_alloc_buffer(io_data, data_len); 10199353afbbSMichal Nazarewicz if (unlikely(!data)) { 10209353afbbSMichal Nazarewicz ret = -ENOMEM; 10219353afbbSMichal Nazarewicz goto error_mutex; 10229353afbbSMichal Nazarewicz } 10239353afbbSMichal Nazarewicz if (!io_data->read && 1024cbbd26b8SAl Viro !copy_from_iter_full(data, data_len, &io_data->data)) { 102500a2430fSAndrzej Pietrasiewicz ret = -EFAULT; 10269353afbbSMichal Nazarewicz goto error_mutex; 102700a2430fSAndrzej Pietrasiewicz } 102800a2430fSAndrzej Pietrasiewicz } 102900a2430fSAndrzej Pietrasiewicz 103000a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 103100a2430fSAndrzej Pietrasiewicz 103200a2430fSAndrzej Pietrasiewicz if (epfile->ep != ep) { 103300a2430fSAndrzej Pietrasiewicz /* In the meantime, endpoint got disabled or changed. */ 103400a2430fSAndrzej Pietrasiewicz ret = -ESHUTDOWN; 103500a2430fSAndrzej Pietrasiewicz } else if (halt) { 1036cdff9f8eSJerry Zhang ret = usb_ep_set_halt(ep->ep); 1037cdff9f8eSJerry Zhang if (!ret) 103800a2430fSAndrzej Pietrasiewicz ret = -EBADMSG; 1039ae76e134SMichal Nazarewicz } else if (unlikely(data_len == -EINVAL)) { 1040c0d31b3cSDavid Cohen /* 1041c0d31b3cSDavid Cohen * Sanity Check: even though data_len can't be used 1042c0d31b3cSDavid Cohen * uninitialized at the time I write this comment, some 1043c0d31b3cSDavid Cohen * compilers complain about this situation. 1044c0d31b3cSDavid Cohen * In order to keep the code clean from warnings, data_len is 1045c0d31b3cSDavid Cohen * being initialized to -EINVAL during its declaration, which 1046c0d31b3cSDavid Cohen * means we can't rely on compiler anymore to warn no future 1047c0d31b3cSDavid Cohen * changes won't result in data_len being used uninitialized. 1048c0d31b3cSDavid Cohen * For such reason, we're adding this redundant sanity check 1049c0d31b3cSDavid Cohen * here. 1050c0d31b3cSDavid Cohen */ 1051c0d31b3cSDavid Cohen WARN(1, "%s: data_len == -EINVAL\n", __func__); 1052c0d31b3cSDavid Cohen ret = -EINVAL; 1053ae76e134SMichal Nazarewicz } else if (!io_data->aio) { 1054ae76e134SMichal Nazarewicz DECLARE_COMPLETION_ONSTACK(done); 1055ef150884SDu, Changbin bool interrupted = false; 1056ae76e134SMichal Nazarewicz 1057ae76e134SMichal Nazarewicz req = ep->req; 1058772a7a72SAndrzej Pietrasiewicz if (io_data->use_sg) { 1059772a7a72SAndrzej Pietrasiewicz req->buf = NULL; 1060772a7a72SAndrzej Pietrasiewicz req->sg = io_data->sgt.sgl; 1061772a7a72SAndrzej Pietrasiewicz req->num_sgs = io_data->sgt.nents; 1062772a7a72SAndrzej Pietrasiewicz } else { 1063ae76e134SMichal Nazarewicz req->buf = data; 1064772a7a72SAndrzej Pietrasiewicz } 1065ae76e134SMichal Nazarewicz req->length = data_len; 1066ae76e134SMichal Nazarewicz 1067772a7a72SAndrzej Pietrasiewicz io_data->buf = data; 1068772a7a72SAndrzej Pietrasiewicz 1069ae76e134SMichal Nazarewicz req->context = &done; 1070ae76e134SMichal Nazarewicz req->complete = ffs_epfile_io_complete; 1071ae76e134SMichal Nazarewicz 1072ae76e134SMichal Nazarewicz ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); 1073ae76e134SMichal Nazarewicz if (unlikely(ret < 0)) 1074c0d31b3cSDavid Cohen goto error_lock; 1075ae76e134SMichal Nazarewicz 1076ae76e134SMichal Nazarewicz spin_unlock_irq(&epfile->ffs->eps_lock); 1077ae76e134SMichal Nazarewicz 1078ae76e134SMichal Nazarewicz if (unlikely(wait_for_completion_interruptible(&done))) { 1079ef150884SDu, Changbin /* 1080ef150884SDu, Changbin * To avoid race condition with ffs_epfile_io_complete, 1081ef150884SDu, Changbin * dequeue the request first then check 1082ef150884SDu, Changbin * status. usb_ep_dequeue API should guarantee no race 1083ef150884SDu, Changbin * condition with req->complete callback. 1084ef150884SDu, Changbin */ 1085ae76e134SMichal Nazarewicz usb_ep_dequeue(ep->ep, req); 108654f64d5cSJohn Stultz wait_for_completion(&done); 1087ef150884SDu, Changbin interrupted = ep->status < 0; 1088c0d31b3cSDavid Cohen } 1089c0d31b3cSDavid Cohen 1090c662a31bSMichal Nazarewicz if (interrupted) 1091c662a31bSMichal Nazarewicz ret = -EINTR; 1092c662a31bSMichal Nazarewicz else if (io_data->read && ep->status > 0) 10939353afbbSMichal Nazarewicz ret = __ffs_epfile_read_data(epfile, data, ep->status, 1094c662a31bSMichal Nazarewicz &io_data->data); 1095c662a31bSMichal Nazarewicz else 1096c662a31bSMichal Nazarewicz ret = ep->status; 1097ae76e134SMichal Nazarewicz goto error_mutex; 109830bf90ccSVincent Pelletier } else if (!(req = usb_ep_alloc_request(ep->ep, GFP_ATOMIC))) { 10993163c79eSMichal Nazarewicz ret = -ENOMEM; 1100ae76e134SMichal Nazarewicz } else { 1101772a7a72SAndrzej Pietrasiewicz if (io_data->use_sg) { 1102772a7a72SAndrzej Pietrasiewicz req->buf = NULL; 1103772a7a72SAndrzej Pietrasiewicz req->sg = io_data->sgt.sgl; 1104772a7a72SAndrzej Pietrasiewicz req->num_sgs = io_data->sgt.nents; 1105772a7a72SAndrzej Pietrasiewicz } else { 110600a2430fSAndrzej Pietrasiewicz req->buf = data; 1107772a7a72SAndrzej Pietrasiewicz } 1108c0d31b3cSDavid Cohen req->length = data_len; 110900a2430fSAndrzej Pietrasiewicz 111000a2430fSAndrzej Pietrasiewicz io_data->buf = data; 111100a2430fSAndrzej Pietrasiewicz io_data->ep = ep->ep; 111200a2430fSAndrzej Pietrasiewicz io_data->req = req; 11135e33f6fdSRobert Baldyga io_data->ffs = epfile->ffs; 111400a2430fSAndrzej Pietrasiewicz 111500a2430fSAndrzej Pietrasiewicz req->context = io_data; 111600a2430fSAndrzej Pietrasiewicz req->complete = ffs_epfile_async_io_complete; 111700a2430fSAndrzej Pietrasiewicz 111800a2430fSAndrzej Pietrasiewicz ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC); 111900a2430fSAndrzej Pietrasiewicz if (unlikely(ret)) { 112000a2430fSAndrzej Pietrasiewicz usb_ep_free_request(ep->ep, req); 112100a2430fSAndrzej Pietrasiewicz goto error_lock; 112200a2430fSAndrzej Pietrasiewicz } 1123ae76e134SMichal Nazarewicz 112400a2430fSAndrzej Pietrasiewicz ret = -EIOCBQUEUED; 112500a2430fSAndrzej Pietrasiewicz /* 1126ae76e134SMichal Nazarewicz * Do not kfree the buffer in this function. It will be freed 1127ae76e134SMichal Nazarewicz * by ffs_user_copy_worker. 112800a2430fSAndrzej Pietrasiewicz */ 1129ae76e134SMichal Nazarewicz data = NULL; 113000a2430fSAndrzej Pietrasiewicz } 113100a2430fSAndrzej Pietrasiewicz 113200a2430fSAndrzej Pietrasiewicz error_lock: 113300a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 1134ae76e134SMichal Nazarewicz error_mutex: 113500a2430fSAndrzej Pietrasiewicz mutex_unlock(&epfile->mutex); 113600a2430fSAndrzej Pietrasiewicz error: 113773103c7fSFei Yang if (ret != -EIOCBQUEUED) /* don't free if there is iocb queued */ 1138772a7a72SAndrzej Pietrasiewicz ffs_free_buffer(io_data); 113900a2430fSAndrzej Pietrasiewicz return ret; 114000a2430fSAndrzej Pietrasiewicz } 114100a2430fSAndrzej Pietrasiewicz 114200a2430fSAndrzej Pietrasiewicz static int 114300a2430fSAndrzej Pietrasiewicz ffs_epfile_open(struct inode *inode, struct file *file) 114400a2430fSAndrzej Pietrasiewicz { 114500a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = inode->i_private; 114600a2430fSAndrzej Pietrasiewicz 114700a2430fSAndrzej Pietrasiewicz ENTER(); 114800a2430fSAndrzej Pietrasiewicz 114900a2430fSAndrzej Pietrasiewicz if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) 115000a2430fSAndrzej Pietrasiewicz return -ENODEV; 115100a2430fSAndrzej Pietrasiewicz 115200a2430fSAndrzej Pietrasiewicz file->private_data = epfile; 115300a2430fSAndrzej Pietrasiewicz ffs_data_opened(epfile->ffs); 115400a2430fSAndrzej Pietrasiewicz 115500a2430fSAndrzej Pietrasiewicz return 0; 115600a2430fSAndrzej Pietrasiewicz } 115700a2430fSAndrzej Pietrasiewicz 115800a2430fSAndrzej Pietrasiewicz static int ffs_aio_cancel(struct kiocb *kiocb) 115900a2430fSAndrzej Pietrasiewicz { 116000a2430fSAndrzej Pietrasiewicz struct ffs_io_data *io_data = kiocb->private; 1161a9c85903SShen Jing struct ffs_epfile *epfile = kiocb->ki_filp->private_data; 116200a2430fSAndrzej Pietrasiewicz int value; 116300a2430fSAndrzej Pietrasiewicz 116400a2430fSAndrzej Pietrasiewicz ENTER(); 116500a2430fSAndrzej Pietrasiewicz 1166a9c85903SShen Jing spin_lock_irq(&epfile->ffs->eps_lock); 1167a9c85903SShen Jing 1168a9c85903SShen Jing if (likely(io_data && io_data->ep && io_data->req)) 1169a9c85903SShen Jing value = usb_ep_dequeue(io_data->ep, io_data->req); 1170a9c85903SShen Jing else 117100a2430fSAndrzej Pietrasiewicz value = -EINVAL; 1172a9c85903SShen Jing 1173a9c85903SShen Jing spin_unlock_irq(&epfile->ffs->eps_lock); 117400a2430fSAndrzej Pietrasiewicz 117500a2430fSAndrzej Pietrasiewicz return value; 117600a2430fSAndrzej Pietrasiewicz } 117700a2430fSAndrzej Pietrasiewicz 117870e60d91SAl Viro static ssize_t ffs_epfile_write_iter(struct kiocb *kiocb, struct iov_iter *from) 117900a2430fSAndrzej Pietrasiewicz { 118070e60d91SAl Viro struct ffs_io_data io_data, *p = &io_data; 1181de2080d4SAl Viro ssize_t res; 118200a2430fSAndrzej Pietrasiewicz 118300a2430fSAndrzej Pietrasiewicz ENTER(); 118400a2430fSAndrzej Pietrasiewicz 118570e60d91SAl Viro if (!is_sync_kiocb(kiocb)) { 118670e60d91SAl Viro p = kmalloc(sizeof(io_data), GFP_KERNEL); 118770e60d91SAl Viro if (unlikely(!p)) 118800a2430fSAndrzej Pietrasiewicz return -ENOMEM; 118970e60d91SAl Viro p->aio = true; 119070e60d91SAl Viro } else { 119170e60d91SAl Viro p->aio = false; 119270e60d91SAl Viro } 119300a2430fSAndrzej Pietrasiewicz 119470e60d91SAl Viro p->read = false; 119570e60d91SAl Viro p->kiocb = kiocb; 119670e60d91SAl Viro p->data = *from; 119770e60d91SAl Viro p->mm = current->mm; 119800a2430fSAndrzej Pietrasiewicz 119970e60d91SAl Viro kiocb->private = p; 120000a2430fSAndrzej Pietrasiewicz 12014088acf1SRui Miguel Silva if (p->aio) 120200a2430fSAndrzej Pietrasiewicz kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); 120300a2430fSAndrzej Pietrasiewicz 120470e60d91SAl Viro res = ffs_epfile_io(kiocb->ki_filp, p); 120570e60d91SAl Viro if (res == -EIOCBQUEUED) 120670e60d91SAl Viro return res; 120770e60d91SAl Viro if (p->aio) 120870e60d91SAl Viro kfree(p); 120970e60d91SAl Viro else 121070e60d91SAl Viro *from = p->data; 1211de2080d4SAl Viro return res; 121200a2430fSAndrzej Pietrasiewicz } 121300a2430fSAndrzej Pietrasiewicz 121470e60d91SAl Viro static ssize_t ffs_epfile_read_iter(struct kiocb *kiocb, struct iov_iter *to) 121500a2430fSAndrzej Pietrasiewicz { 121670e60d91SAl Viro struct ffs_io_data io_data, *p = &io_data; 1217de2080d4SAl Viro ssize_t res; 121800a2430fSAndrzej Pietrasiewicz 121900a2430fSAndrzej Pietrasiewicz ENTER(); 122000a2430fSAndrzej Pietrasiewicz 122170e60d91SAl Viro if (!is_sync_kiocb(kiocb)) { 122270e60d91SAl Viro p = kmalloc(sizeof(io_data), GFP_KERNEL); 122370e60d91SAl Viro if (unlikely(!p)) 122400a2430fSAndrzej Pietrasiewicz return -ENOMEM; 122570e60d91SAl Viro p->aio = true; 122670e60d91SAl Viro } else { 122770e60d91SAl Viro p->aio = false; 122800a2430fSAndrzej Pietrasiewicz } 122900a2430fSAndrzej Pietrasiewicz 123070e60d91SAl Viro p->read = true; 123170e60d91SAl Viro p->kiocb = kiocb; 123270e60d91SAl Viro if (p->aio) { 123370e60d91SAl Viro p->to_free = dup_iter(&p->data, to, GFP_KERNEL); 123470e60d91SAl Viro if (!p->to_free) { 123570e60d91SAl Viro kfree(p); 123670e60d91SAl Viro return -ENOMEM; 123770e60d91SAl Viro } 123870e60d91SAl Viro } else { 123970e60d91SAl Viro p->data = *to; 124070e60d91SAl Viro p->to_free = NULL; 124170e60d91SAl Viro } 124270e60d91SAl Viro p->mm = current->mm; 124300a2430fSAndrzej Pietrasiewicz 124470e60d91SAl Viro kiocb->private = p; 124500a2430fSAndrzej Pietrasiewicz 12464088acf1SRui Miguel Silva if (p->aio) 124700a2430fSAndrzej Pietrasiewicz kiocb_set_cancel_fn(kiocb, ffs_aio_cancel); 124800a2430fSAndrzej Pietrasiewicz 124970e60d91SAl Viro res = ffs_epfile_io(kiocb->ki_filp, p); 125070e60d91SAl Viro if (res == -EIOCBQUEUED) 125170e60d91SAl Viro return res; 125270e60d91SAl Viro 125370e60d91SAl Viro if (p->aio) { 125470e60d91SAl Viro kfree(p->to_free); 125570e60d91SAl Viro kfree(p); 125670e60d91SAl Viro } else { 125770e60d91SAl Viro *to = p->data; 1258de2080d4SAl Viro } 1259de2080d4SAl Viro return res; 126000a2430fSAndrzej Pietrasiewicz } 126100a2430fSAndrzej Pietrasiewicz 126200a2430fSAndrzej Pietrasiewicz static int 126300a2430fSAndrzej Pietrasiewicz ffs_epfile_release(struct inode *inode, struct file *file) 126400a2430fSAndrzej Pietrasiewicz { 126500a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = inode->i_private; 126600a2430fSAndrzej Pietrasiewicz 126700a2430fSAndrzej Pietrasiewicz ENTER(); 126800a2430fSAndrzej Pietrasiewicz 1269a9e6f83cSMichal Nazarewicz __ffs_epfile_read_buffer_free(epfile); 127000a2430fSAndrzej Pietrasiewicz ffs_data_closed(epfile->ffs); 127100a2430fSAndrzej Pietrasiewicz 127200a2430fSAndrzej Pietrasiewicz return 0; 127300a2430fSAndrzej Pietrasiewicz } 127400a2430fSAndrzej Pietrasiewicz 127500a2430fSAndrzej Pietrasiewicz static long ffs_epfile_ioctl(struct file *file, unsigned code, 127600a2430fSAndrzej Pietrasiewicz unsigned long value) 127700a2430fSAndrzej Pietrasiewicz { 127800a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = file->private_data; 1279222155deSJerry Zhang struct ffs_ep *ep; 128000a2430fSAndrzej Pietrasiewicz int ret; 128100a2430fSAndrzej Pietrasiewicz 128200a2430fSAndrzej Pietrasiewicz ENTER(); 128300a2430fSAndrzej Pietrasiewicz 128400a2430fSAndrzej Pietrasiewicz if (WARN_ON(epfile->ffs->state != FFS_ACTIVE)) 128500a2430fSAndrzej Pietrasiewicz return -ENODEV; 128600a2430fSAndrzej Pietrasiewicz 1287222155deSJerry Zhang /* Wait for endpoint to be enabled */ 1288222155deSJerry Zhang ep = epfile->ep; 1289222155deSJerry Zhang if (!ep) { 1290222155deSJerry Zhang if (file->f_flags & O_NONBLOCK) 1291222155deSJerry Zhang return -EAGAIN; 1292222155deSJerry Zhang 1293e16828cfSJerry Zhang ret = wait_event_interruptible( 1294e16828cfSJerry Zhang epfile->ffs->wait, (ep = epfile->ep)); 1295222155deSJerry Zhang if (ret) 1296222155deSJerry Zhang return -EINTR; 1297222155deSJerry Zhang } 1298222155deSJerry Zhang 129900a2430fSAndrzej Pietrasiewicz spin_lock_irq(&epfile->ffs->eps_lock); 1300222155deSJerry Zhang 1301222155deSJerry Zhang /* In the meantime, endpoint got disabled or changed. */ 1302222155deSJerry Zhang if (epfile->ep != ep) { 1303222155deSJerry Zhang spin_unlock_irq(&epfile->ffs->eps_lock); 1304222155deSJerry Zhang return -ESHUTDOWN; 1305222155deSJerry Zhang } 1306222155deSJerry Zhang 130700a2430fSAndrzej Pietrasiewicz switch (code) { 130800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_FIFO_STATUS: 130900a2430fSAndrzej Pietrasiewicz ret = usb_ep_fifo_status(epfile->ep->ep); 131000a2430fSAndrzej Pietrasiewicz break; 131100a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_FIFO_FLUSH: 131200a2430fSAndrzej Pietrasiewicz usb_ep_fifo_flush(epfile->ep->ep); 131300a2430fSAndrzej Pietrasiewicz ret = 0; 131400a2430fSAndrzej Pietrasiewicz break; 131500a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_CLEAR_HALT: 131600a2430fSAndrzej Pietrasiewicz ret = usb_ep_clear_halt(epfile->ep->ep); 131700a2430fSAndrzej Pietrasiewicz break; 131800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_ENDPOINT_REVMAP: 131900a2430fSAndrzej Pietrasiewicz ret = epfile->ep->num; 132000a2430fSAndrzej Pietrasiewicz break; 1321c559a353SRobert Baldyga case FUNCTIONFS_ENDPOINT_DESC: 1322c559a353SRobert Baldyga { 1323c559a353SRobert Baldyga int desc_idx; 1324c559a353SRobert Baldyga struct usb_endpoint_descriptor *desc; 1325c559a353SRobert Baldyga 1326c559a353SRobert Baldyga switch (epfile->ffs->gadget->speed) { 1327c559a353SRobert Baldyga case USB_SPEED_SUPER: 1328c559a353SRobert Baldyga desc_idx = 2; 1329c559a353SRobert Baldyga break; 1330c559a353SRobert Baldyga case USB_SPEED_HIGH: 1331c559a353SRobert Baldyga desc_idx = 1; 1332c559a353SRobert Baldyga break; 1333c559a353SRobert Baldyga default: 1334c559a353SRobert Baldyga desc_idx = 0; 1335c559a353SRobert Baldyga } 1336c559a353SRobert Baldyga desc = epfile->ep->descs[desc_idx]; 1337c559a353SRobert Baldyga 1338c559a353SRobert Baldyga spin_unlock_irq(&epfile->ffs->eps_lock); 1339c40619bbSVincent Pelletier ret = copy_to_user((void __user *)value, desc, desc->bLength); 1340c559a353SRobert Baldyga if (ret) 1341c559a353SRobert Baldyga ret = -EFAULT; 1342c559a353SRobert Baldyga return ret; 1343c559a353SRobert Baldyga } 134400a2430fSAndrzej Pietrasiewicz default: 134500a2430fSAndrzej Pietrasiewicz ret = -ENOTTY; 134600a2430fSAndrzej Pietrasiewicz } 134700a2430fSAndrzej Pietrasiewicz spin_unlock_irq(&epfile->ffs->eps_lock); 134800a2430fSAndrzej Pietrasiewicz 134900a2430fSAndrzej Pietrasiewicz return ret; 135000a2430fSAndrzej Pietrasiewicz } 135100a2430fSAndrzej Pietrasiewicz 13526819e323SJerry Zhang #ifdef CONFIG_COMPAT 13536819e323SJerry Zhang static long ffs_epfile_compat_ioctl(struct file *file, unsigned code, 13546819e323SJerry Zhang unsigned long value) 13556819e323SJerry Zhang { 13566819e323SJerry Zhang return ffs_epfile_ioctl(file, code, value); 13576819e323SJerry Zhang } 13586819e323SJerry Zhang #endif 13596819e323SJerry Zhang 136000a2430fSAndrzej Pietrasiewicz static const struct file_operations ffs_epfile_operations = { 136100a2430fSAndrzej Pietrasiewicz .llseek = no_llseek, 136200a2430fSAndrzej Pietrasiewicz 136300a2430fSAndrzej Pietrasiewicz .open = ffs_epfile_open, 136470e60d91SAl Viro .write_iter = ffs_epfile_write_iter, 136570e60d91SAl Viro .read_iter = ffs_epfile_read_iter, 136600a2430fSAndrzej Pietrasiewicz .release = ffs_epfile_release, 136700a2430fSAndrzej Pietrasiewicz .unlocked_ioctl = ffs_epfile_ioctl, 13686819e323SJerry Zhang #ifdef CONFIG_COMPAT 13696819e323SJerry Zhang .compat_ioctl = ffs_epfile_compat_ioctl, 13706819e323SJerry Zhang #endif 137100a2430fSAndrzej Pietrasiewicz }; 137200a2430fSAndrzej Pietrasiewicz 137300a2430fSAndrzej Pietrasiewicz 137400a2430fSAndrzej Pietrasiewicz /* File system and super block operations ***********************************/ 137500a2430fSAndrzej Pietrasiewicz 137600a2430fSAndrzej Pietrasiewicz /* 137700a2430fSAndrzej Pietrasiewicz * Mounting the file system creates a controller file, used first for 137800a2430fSAndrzej Pietrasiewicz * function configuration then later for event monitoring. 137900a2430fSAndrzej Pietrasiewicz */ 138000a2430fSAndrzej Pietrasiewicz 138100a2430fSAndrzej Pietrasiewicz static struct inode *__must_check 138200a2430fSAndrzej Pietrasiewicz ffs_sb_make_inode(struct super_block *sb, void *data, 138300a2430fSAndrzej Pietrasiewicz const struct file_operations *fops, 138400a2430fSAndrzej Pietrasiewicz const struct inode_operations *iops, 138500a2430fSAndrzej Pietrasiewicz struct ffs_file_perms *perms) 138600a2430fSAndrzej Pietrasiewicz { 138700a2430fSAndrzej Pietrasiewicz struct inode *inode; 138800a2430fSAndrzej Pietrasiewicz 138900a2430fSAndrzej Pietrasiewicz ENTER(); 139000a2430fSAndrzej Pietrasiewicz 139100a2430fSAndrzej Pietrasiewicz inode = new_inode(sb); 139200a2430fSAndrzej Pietrasiewicz 139300a2430fSAndrzej Pietrasiewicz if (likely(inode)) { 139495582b00SDeepa Dinamani struct timespec64 ts = current_time(inode); 139500a2430fSAndrzej Pietrasiewicz 139600a2430fSAndrzej Pietrasiewicz inode->i_ino = get_next_ino(); 139700a2430fSAndrzej Pietrasiewicz inode->i_mode = perms->mode; 139800a2430fSAndrzej Pietrasiewicz inode->i_uid = perms->uid; 139900a2430fSAndrzej Pietrasiewicz inode->i_gid = perms->gid; 1400078cd827SDeepa Dinamani inode->i_atime = ts; 1401078cd827SDeepa Dinamani inode->i_mtime = ts; 1402078cd827SDeepa Dinamani inode->i_ctime = ts; 140300a2430fSAndrzej Pietrasiewicz inode->i_private = data; 140400a2430fSAndrzej Pietrasiewicz if (fops) 140500a2430fSAndrzej Pietrasiewicz inode->i_fop = fops; 140600a2430fSAndrzej Pietrasiewicz if (iops) 140700a2430fSAndrzej Pietrasiewicz inode->i_op = iops; 140800a2430fSAndrzej Pietrasiewicz } 140900a2430fSAndrzej Pietrasiewicz 141000a2430fSAndrzej Pietrasiewicz return inode; 141100a2430fSAndrzej Pietrasiewicz } 141200a2430fSAndrzej Pietrasiewicz 141300a2430fSAndrzej Pietrasiewicz /* Create "regular" file */ 14141bb27cacSAl Viro static struct dentry *ffs_sb_create_file(struct super_block *sb, 141500a2430fSAndrzej Pietrasiewicz const char *name, void *data, 14161bb27cacSAl Viro const struct file_operations *fops) 141700a2430fSAndrzej Pietrasiewicz { 141800a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = sb->s_fs_info; 141900a2430fSAndrzej Pietrasiewicz struct dentry *dentry; 142000a2430fSAndrzej Pietrasiewicz struct inode *inode; 142100a2430fSAndrzej Pietrasiewicz 142200a2430fSAndrzej Pietrasiewicz ENTER(); 142300a2430fSAndrzej Pietrasiewicz 142400a2430fSAndrzej Pietrasiewicz dentry = d_alloc_name(sb->s_root, name); 142500a2430fSAndrzej Pietrasiewicz if (unlikely(!dentry)) 142600a2430fSAndrzej Pietrasiewicz return NULL; 142700a2430fSAndrzej Pietrasiewicz 142800a2430fSAndrzej Pietrasiewicz inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms); 142900a2430fSAndrzej Pietrasiewicz if (unlikely(!inode)) { 143000a2430fSAndrzej Pietrasiewicz dput(dentry); 143100a2430fSAndrzej Pietrasiewicz return NULL; 143200a2430fSAndrzej Pietrasiewicz } 143300a2430fSAndrzej Pietrasiewicz 143400a2430fSAndrzej Pietrasiewicz d_add(dentry, inode); 14351bb27cacSAl Viro return dentry; 143600a2430fSAndrzej Pietrasiewicz } 143700a2430fSAndrzej Pietrasiewicz 143800a2430fSAndrzej Pietrasiewicz /* Super block */ 143900a2430fSAndrzej Pietrasiewicz static const struct super_operations ffs_sb_operations = { 144000a2430fSAndrzej Pietrasiewicz .statfs = simple_statfs, 144100a2430fSAndrzej Pietrasiewicz .drop_inode = generic_delete_inode, 144200a2430fSAndrzej Pietrasiewicz }; 144300a2430fSAndrzej Pietrasiewicz 144400a2430fSAndrzej Pietrasiewicz struct ffs_sb_fill_data { 144500a2430fSAndrzej Pietrasiewicz struct ffs_file_perms perms; 144600a2430fSAndrzej Pietrasiewicz umode_t root_mode; 144700a2430fSAndrzej Pietrasiewicz const char *dev_name; 144818d6b32fSRobert Baldyga bool no_disconnect; 144900a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs_data; 145000a2430fSAndrzej Pietrasiewicz }; 145100a2430fSAndrzej Pietrasiewicz 145200a2430fSAndrzej Pietrasiewicz static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) 145300a2430fSAndrzej Pietrasiewicz { 145400a2430fSAndrzej Pietrasiewicz struct ffs_sb_fill_data *data = _data; 145500a2430fSAndrzej Pietrasiewicz struct inode *inode; 145600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = data->ffs_data; 145700a2430fSAndrzej Pietrasiewicz 145800a2430fSAndrzej Pietrasiewicz ENTER(); 145900a2430fSAndrzej Pietrasiewicz 146000a2430fSAndrzej Pietrasiewicz ffs->sb = sb; 146100a2430fSAndrzej Pietrasiewicz data->ffs_data = NULL; 146200a2430fSAndrzej Pietrasiewicz sb->s_fs_info = ffs; 146309cbfeafSKirill A. Shutemov sb->s_blocksize = PAGE_SIZE; 146409cbfeafSKirill A. Shutemov sb->s_blocksize_bits = PAGE_SHIFT; 146500a2430fSAndrzej Pietrasiewicz sb->s_magic = FUNCTIONFS_MAGIC; 146600a2430fSAndrzej Pietrasiewicz sb->s_op = &ffs_sb_operations; 146700a2430fSAndrzej Pietrasiewicz sb->s_time_gran = 1; 146800a2430fSAndrzej Pietrasiewicz 146900a2430fSAndrzej Pietrasiewicz /* Root inode */ 147000a2430fSAndrzej Pietrasiewicz data->perms.mode = data->root_mode; 147100a2430fSAndrzej Pietrasiewicz inode = ffs_sb_make_inode(sb, NULL, 147200a2430fSAndrzej Pietrasiewicz &simple_dir_operations, 147300a2430fSAndrzej Pietrasiewicz &simple_dir_inode_operations, 147400a2430fSAndrzej Pietrasiewicz &data->perms); 147500a2430fSAndrzej Pietrasiewicz sb->s_root = d_make_root(inode); 147600a2430fSAndrzej Pietrasiewicz if (unlikely(!sb->s_root)) 147700a2430fSAndrzej Pietrasiewicz return -ENOMEM; 147800a2430fSAndrzej Pietrasiewicz 147900a2430fSAndrzej Pietrasiewicz /* EP0 file */ 148000a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs_sb_create_file(sb, "ep0", ffs, 14811bb27cacSAl Viro &ffs_ep0_operations))) 148200a2430fSAndrzej Pietrasiewicz return -ENOMEM; 148300a2430fSAndrzej Pietrasiewicz 148400a2430fSAndrzej Pietrasiewicz return 0; 148500a2430fSAndrzej Pietrasiewicz } 148600a2430fSAndrzej Pietrasiewicz 148700a2430fSAndrzej Pietrasiewicz static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) 148800a2430fSAndrzej Pietrasiewicz { 148900a2430fSAndrzej Pietrasiewicz ENTER(); 149000a2430fSAndrzej Pietrasiewicz 149100a2430fSAndrzej Pietrasiewicz if (!opts || !*opts) 149200a2430fSAndrzej Pietrasiewicz return 0; 149300a2430fSAndrzej Pietrasiewicz 149400a2430fSAndrzej Pietrasiewicz for (;;) { 149500a2430fSAndrzej Pietrasiewicz unsigned long value; 149600a2430fSAndrzej Pietrasiewicz char *eq, *comma; 149700a2430fSAndrzej Pietrasiewicz 149800a2430fSAndrzej Pietrasiewicz /* Option limit */ 149900a2430fSAndrzej Pietrasiewicz comma = strchr(opts, ','); 150000a2430fSAndrzej Pietrasiewicz if (comma) 150100a2430fSAndrzej Pietrasiewicz *comma = 0; 150200a2430fSAndrzej Pietrasiewicz 150300a2430fSAndrzej Pietrasiewicz /* Value limit */ 150400a2430fSAndrzej Pietrasiewicz eq = strchr(opts, '='); 150500a2430fSAndrzej Pietrasiewicz if (unlikely(!eq)) { 150600a2430fSAndrzej Pietrasiewicz pr_err("'=' missing in %s\n", opts); 150700a2430fSAndrzej Pietrasiewicz return -EINVAL; 150800a2430fSAndrzej Pietrasiewicz } 150900a2430fSAndrzej Pietrasiewicz *eq = 0; 151000a2430fSAndrzej Pietrasiewicz 151100a2430fSAndrzej Pietrasiewicz /* Parse value */ 151200a2430fSAndrzej Pietrasiewicz if (kstrtoul(eq + 1, 0, &value)) { 151300a2430fSAndrzej Pietrasiewicz pr_err("%s: invalid value: %s\n", opts, eq + 1); 151400a2430fSAndrzej Pietrasiewicz return -EINVAL; 151500a2430fSAndrzej Pietrasiewicz } 151600a2430fSAndrzej Pietrasiewicz 151700a2430fSAndrzej Pietrasiewicz /* Interpret option */ 151800a2430fSAndrzej Pietrasiewicz switch (eq - opts) { 151918d6b32fSRobert Baldyga case 13: 152018d6b32fSRobert Baldyga if (!memcmp(opts, "no_disconnect", 13)) 152118d6b32fSRobert Baldyga data->no_disconnect = !!value; 152218d6b32fSRobert Baldyga else 152318d6b32fSRobert Baldyga goto invalid; 152418d6b32fSRobert Baldyga break; 152500a2430fSAndrzej Pietrasiewicz case 5: 152600a2430fSAndrzej Pietrasiewicz if (!memcmp(opts, "rmode", 5)) 152700a2430fSAndrzej Pietrasiewicz data->root_mode = (value & 0555) | S_IFDIR; 152800a2430fSAndrzej Pietrasiewicz else if (!memcmp(opts, "fmode", 5)) 152900a2430fSAndrzej Pietrasiewicz data->perms.mode = (value & 0666) | S_IFREG; 153000a2430fSAndrzej Pietrasiewicz else 153100a2430fSAndrzej Pietrasiewicz goto invalid; 153200a2430fSAndrzej Pietrasiewicz break; 153300a2430fSAndrzej Pietrasiewicz 153400a2430fSAndrzej Pietrasiewicz case 4: 153500a2430fSAndrzej Pietrasiewicz if (!memcmp(opts, "mode", 4)) { 153600a2430fSAndrzej Pietrasiewicz data->root_mode = (value & 0555) | S_IFDIR; 153700a2430fSAndrzej Pietrasiewicz data->perms.mode = (value & 0666) | S_IFREG; 153800a2430fSAndrzej Pietrasiewicz } else { 153900a2430fSAndrzej Pietrasiewicz goto invalid; 154000a2430fSAndrzej Pietrasiewicz } 154100a2430fSAndrzej Pietrasiewicz break; 154200a2430fSAndrzej Pietrasiewicz 154300a2430fSAndrzej Pietrasiewicz case 3: 154400a2430fSAndrzej Pietrasiewicz if (!memcmp(opts, "uid", 3)) { 154500a2430fSAndrzej Pietrasiewicz data->perms.uid = make_kuid(current_user_ns(), value); 154600a2430fSAndrzej Pietrasiewicz if (!uid_valid(data->perms.uid)) { 154700a2430fSAndrzej Pietrasiewicz pr_err("%s: unmapped value: %lu\n", opts, value); 154800a2430fSAndrzej Pietrasiewicz return -EINVAL; 154900a2430fSAndrzej Pietrasiewicz } 155000a2430fSAndrzej Pietrasiewicz } else if (!memcmp(opts, "gid", 3)) { 155100a2430fSAndrzej Pietrasiewicz data->perms.gid = make_kgid(current_user_ns(), value); 155200a2430fSAndrzej Pietrasiewicz if (!gid_valid(data->perms.gid)) { 155300a2430fSAndrzej Pietrasiewicz pr_err("%s: unmapped value: %lu\n", opts, value); 155400a2430fSAndrzej Pietrasiewicz return -EINVAL; 155500a2430fSAndrzej Pietrasiewicz } 155600a2430fSAndrzej Pietrasiewicz } else { 155700a2430fSAndrzej Pietrasiewicz goto invalid; 155800a2430fSAndrzej Pietrasiewicz } 155900a2430fSAndrzej Pietrasiewicz break; 156000a2430fSAndrzej Pietrasiewicz 156100a2430fSAndrzej Pietrasiewicz default: 156200a2430fSAndrzej Pietrasiewicz invalid: 156300a2430fSAndrzej Pietrasiewicz pr_err("%s: invalid option\n", opts); 156400a2430fSAndrzej Pietrasiewicz return -EINVAL; 156500a2430fSAndrzej Pietrasiewicz } 156600a2430fSAndrzej Pietrasiewicz 156700a2430fSAndrzej Pietrasiewicz /* Next iteration */ 156800a2430fSAndrzej Pietrasiewicz if (!comma) 156900a2430fSAndrzej Pietrasiewicz break; 157000a2430fSAndrzej Pietrasiewicz opts = comma + 1; 157100a2430fSAndrzej Pietrasiewicz } 157200a2430fSAndrzej Pietrasiewicz 157300a2430fSAndrzej Pietrasiewicz return 0; 157400a2430fSAndrzej Pietrasiewicz } 157500a2430fSAndrzej Pietrasiewicz 157600a2430fSAndrzej Pietrasiewicz /* "mount -t functionfs dev_name /dev/function" ends up here */ 157700a2430fSAndrzej Pietrasiewicz 157800a2430fSAndrzej Pietrasiewicz static struct dentry * 157900a2430fSAndrzej Pietrasiewicz ffs_fs_mount(struct file_system_type *t, int flags, 158000a2430fSAndrzej Pietrasiewicz const char *dev_name, void *opts) 158100a2430fSAndrzej Pietrasiewicz { 158200a2430fSAndrzej Pietrasiewicz struct ffs_sb_fill_data data = { 158300a2430fSAndrzej Pietrasiewicz .perms = { 158400a2430fSAndrzej Pietrasiewicz .mode = S_IFREG | 0600, 158500a2430fSAndrzej Pietrasiewicz .uid = GLOBAL_ROOT_UID, 158600a2430fSAndrzej Pietrasiewicz .gid = GLOBAL_ROOT_GID, 158700a2430fSAndrzej Pietrasiewicz }, 158800a2430fSAndrzej Pietrasiewicz .root_mode = S_IFDIR | 0500, 158918d6b32fSRobert Baldyga .no_disconnect = false, 159000a2430fSAndrzej Pietrasiewicz }; 159100a2430fSAndrzej Pietrasiewicz struct dentry *rv; 159200a2430fSAndrzej Pietrasiewicz int ret; 159300a2430fSAndrzej Pietrasiewicz void *ffs_dev; 159400a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs; 159500a2430fSAndrzej Pietrasiewicz 159600a2430fSAndrzej Pietrasiewicz ENTER(); 159700a2430fSAndrzej Pietrasiewicz 159800a2430fSAndrzej Pietrasiewicz ret = ffs_fs_parse_opts(&data, opts); 159900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 160000a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 160100a2430fSAndrzej Pietrasiewicz 1602addfc582SJohn Keeping ffs = ffs_data_new(dev_name); 160300a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs)) 160400a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 160500a2430fSAndrzej Pietrasiewicz ffs->file_perms = data.perms; 160618d6b32fSRobert Baldyga ffs->no_disconnect = data.no_disconnect; 160700a2430fSAndrzej Pietrasiewicz 160800a2430fSAndrzej Pietrasiewicz ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); 160900a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs->dev_name)) { 161000a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 161100a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 161200a2430fSAndrzej Pietrasiewicz } 161300a2430fSAndrzej Pietrasiewicz 161400a2430fSAndrzej Pietrasiewicz ffs_dev = ffs_acquire_dev(dev_name); 161500a2430fSAndrzej Pietrasiewicz if (IS_ERR(ffs_dev)) { 161600a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 161700a2430fSAndrzej Pietrasiewicz return ERR_CAST(ffs_dev); 161800a2430fSAndrzej Pietrasiewicz } 161900a2430fSAndrzej Pietrasiewicz ffs->private_data = ffs_dev; 162000a2430fSAndrzej Pietrasiewicz data.ffs_data = ffs; 162100a2430fSAndrzej Pietrasiewicz 162200a2430fSAndrzej Pietrasiewicz rv = mount_nodev(t, flags, &data, ffs_sb_fill); 162300a2430fSAndrzej Pietrasiewicz if (IS_ERR(rv) && data.ffs_data) { 162400a2430fSAndrzej Pietrasiewicz ffs_release_dev(data.ffs_data); 162500a2430fSAndrzej Pietrasiewicz ffs_data_put(data.ffs_data); 162600a2430fSAndrzej Pietrasiewicz } 162700a2430fSAndrzej Pietrasiewicz return rv; 162800a2430fSAndrzej Pietrasiewicz } 162900a2430fSAndrzej Pietrasiewicz 163000a2430fSAndrzej Pietrasiewicz static void 163100a2430fSAndrzej Pietrasiewicz ffs_fs_kill_sb(struct super_block *sb) 163200a2430fSAndrzej Pietrasiewicz { 163300a2430fSAndrzej Pietrasiewicz ENTER(); 163400a2430fSAndrzej Pietrasiewicz 163500a2430fSAndrzej Pietrasiewicz kill_litter_super(sb); 163600a2430fSAndrzej Pietrasiewicz if (sb->s_fs_info) { 163700a2430fSAndrzej Pietrasiewicz ffs_release_dev(sb->s_fs_info); 163818d6b32fSRobert Baldyga ffs_data_closed(sb->s_fs_info); 163900a2430fSAndrzej Pietrasiewicz } 164000a2430fSAndrzej Pietrasiewicz } 164100a2430fSAndrzej Pietrasiewicz 164200a2430fSAndrzej Pietrasiewicz static struct file_system_type ffs_fs_type = { 164300a2430fSAndrzej Pietrasiewicz .owner = THIS_MODULE, 164400a2430fSAndrzej Pietrasiewicz .name = "functionfs", 164500a2430fSAndrzej Pietrasiewicz .mount = ffs_fs_mount, 164600a2430fSAndrzej Pietrasiewicz .kill_sb = ffs_fs_kill_sb, 164700a2430fSAndrzej Pietrasiewicz }; 164800a2430fSAndrzej Pietrasiewicz MODULE_ALIAS_FS("functionfs"); 164900a2430fSAndrzej Pietrasiewicz 165000a2430fSAndrzej Pietrasiewicz 165100a2430fSAndrzej Pietrasiewicz /* Driver's main init/cleanup functions *************************************/ 165200a2430fSAndrzej Pietrasiewicz 165300a2430fSAndrzej Pietrasiewicz static int functionfs_init(void) 165400a2430fSAndrzej Pietrasiewicz { 165500a2430fSAndrzej Pietrasiewicz int ret; 165600a2430fSAndrzej Pietrasiewicz 165700a2430fSAndrzej Pietrasiewicz ENTER(); 165800a2430fSAndrzej Pietrasiewicz 165900a2430fSAndrzej Pietrasiewicz ret = register_filesystem(&ffs_fs_type); 166000a2430fSAndrzej Pietrasiewicz if (likely(!ret)) 166100a2430fSAndrzej Pietrasiewicz pr_info("file system registered\n"); 166200a2430fSAndrzej Pietrasiewicz else 166300a2430fSAndrzej Pietrasiewicz pr_err("failed registering file system (%d)\n", ret); 166400a2430fSAndrzej Pietrasiewicz 166500a2430fSAndrzej Pietrasiewicz return ret; 166600a2430fSAndrzej Pietrasiewicz } 166700a2430fSAndrzej Pietrasiewicz 166800a2430fSAndrzej Pietrasiewicz static void functionfs_cleanup(void) 166900a2430fSAndrzej Pietrasiewicz { 167000a2430fSAndrzej Pietrasiewicz ENTER(); 167100a2430fSAndrzej Pietrasiewicz 167200a2430fSAndrzej Pietrasiewicz pr_info("unloading\n"); 167300a2430fSAndrzej Pietrasiewicz unregister_filesystem(&ffs_fs_type); 167400a2430fSAndrzej Pietrasiewicz } 167500a2430fSAndrzej Pietrasiewicz 167600a2430fSAndrzej Pietrasiewicz 167700a2430fSAndrzej Pietrasiewicz /* ffs_data and ffs_function construction and destruction code **************/ 167800a2430fSAndrzej Pietrasiewicz 167900a2430fSAndrzej Pietrasiewicz static void ffs_data_clear(struct ffs_data *ffs); 168000a2430fSAndrzej Pietrasiewicz static void ffs_data_reset(struct ffs_data *ffs); 168100a2430fSAndrzej Pietrasiewicz 168200a2430fSAndrzej Pietrasiewicz static void ffs_data_get(struct ffs_data *ffs) 168300a2430fSAndrzej Pietrasiewicz { 168400a2430fSAndrzej Pietrasiewicz ENTER(); 168500a2430fSAndrzej Pietrasiewicz 168643938613SElena Reshetova refcount_inc(&ffs->ref); 168700a2430fSAndrzej Pietrasiewicz } 168800a2430fSAndrzej Pietrasiewicz 168900a2430fSAndrzej Pietrasiewicz static void ffs_data_opened(struct ffs_data *ffs) 169000a2430fSAndrzej Pietrasiewicz { 169100a2430fSAndrzej Pietrasiewicz ENTER(); 169200a2430fSAndrzej Pietrasiewicz 169343938613SElena Reshetova refcount_inc(&ffs->ref); 169418d6b32fSRobert Baldyga if (atomic_add_return(1, &ffs->opened) == 1 && 169518d6b32fSRobert Baldyga ffs->state == FFS_DEACTIVATED) { 169618d6b32fSRobert Baldyga ffs->state = FFS_CLOSING; 169718d6b32fSRobert Baldyga ffs_data_reset(ffs); 169818d6b32fSRobert Baldyga } 169900a2430fSAndrzej Pietrasiewicz } 170000a2430fSAndrzej Pietrasiewicz 170100a2430fSAndrzej Pietrasiewicz static void ffs_data_put(struct ffs_data *ffs) 170200a2430fSAndrzej Pietrasiewicz { 170300a2430fSAndrzej Pietrasiewicz ENTER(); 170400a2430fSAndrzej Pietrasiewicz 170543938613SElena Reshetova if (unlikely(refcount_dec_and_test(&ffs->ref))) { 170600a2430fSAndrzej Pietrasiewicz pr_info("%s(): freeing\n", __func__); 170700a2430fSAndrzej Pietrasiewicz ffs_data_clear(ffs); 170800a2430fSAndrzej Pietrasiewicz BUG_ON(waitqueue_active(&ffs->ev.waitq) || 1709e16828cfSJerry Zhang waitqueue_active(&ffs->ep0req_completion.wait) || 1710e16828cfSJerry Zhang waitqueue_active(&ffs->wait)); 1711addfc582SJohn Keeping destroy_workqueue(ffs->io_completion_wq); 171200a2430fSAndrzej Pietrasiewicz kfree(ffs->dev_name); 171300a2430fSAndrzej Pietrasiewicz kfree(ffs); 171400a2430fSAndrzej Pietrasiewicz } 171500a2430fSAndrzej Pietrasiewicz } 171600a2430fSAndrzej Pietrasiewicz 171700a2430fSAndrzej Pietrasiewicz static void ffs_data_closed(struct ffs_data *ffs) 171800a2430fSAndrzej Pietrasiewicz { 171900a2430fSAndrzej Pietrasiewicz ENTER(); 172000a2430fSAndrzej Pietrasiewicz 172100a2430fSAndrzej Pietrasiewicz if (atomic_dec_and_test(&ffs->opened)) { 172218d6b32fSRobert Baldyga if (ffs->no_disconnect) { 172318d6b32fSRobert Baldyga ffs->state = FFS_DEACTIVATED; 172418d6b32fSRobert Baldyga if (ffs->epfiles) { 172518d6b32fSRobert Baldyga ffs_epfiles_destroy(ffs->epfiles, 172618d6b32fSRobert Baldyga ffs->eps_count); 172718d6b32fSRobert Baldyga ffs->epfiles = NULL; 172818d6b32fSRobert Baldyga } 172918d6b32fSRobert Baldyga if (ffs->setup_state == FFS_SETUP_PENDING) 173018d6b32fSRobert Baldyga __ffs_ep0_stall(ffs); 173118d6b32fSRobert Baldyga } else { 173218d6b32fSRobert Baldyga ffs->state = FFS_CLOSING; 173318d6b32fSRobert Baldyga ffs_data_reset(ffs); 173418d6b32fSRobert Baldyga } 173518d6b32fSRobert Baldyga } 173618d6b32fSRobert Baldyga if (atomic_read(&ffs->opened) < 0) { 173700a2430fSAndrzej Pietrasiewicz ffs->state = FFS_CLOSING; 173800a2430fSAndrzej Pietrasiewicz ffs_data_reset(ffs); 173900a2430fSAndrzej Pietrasiewicz } 174000a2430fSAndrzej Pietrasiewicz 174100a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 174200a2430fSAndrzej Pietrasiewicz } 174300a2430fSAndrzej Pietrasiewicz 1744addfc582SJohn Keeping static struct ffs_data *ffs_data_new(const char *dev_name) 174500a2430fSAndrzej Pietrasiewicz { 174600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = kzalloc(sizeof *ffs, GFP_KERNEL); 174700a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs)) 174800a2430fSAndrzej Pietrasiewicz return NULL; 174900a2430fSAndrzej Pietrasiewicz 175000a2430fSAndrzej Pietrasiewicz ENTER(); 175100a2430fSAndrzej Pietrasiewicz 1752addfc582SJohn Keeping ffs->io_completion_wq = alloc_ordered_workqueue("%s", 0, dev_name); 1753addfc582SJohn Keeping if (!ffs->io_completion_wq) { 1754addfc582SJohn Keeping kfree(ffs); 1755addfc582SJohn Keeping return NULL; 1756addfc582SJohn Keeping } 1757addfc582SJohn Keeping 175843938613SElena Reshetova refcount_set(&ffs->ref, 1); 175900a2430fSAndrzej Pietrasiewicz atomic_set(&ffs->opened, 0); 176000a2430fSAndrzej Pietrasiewicz ffs->state = FFS_READ_DESCRIPTORS; 176100a2430fSAndrzej Pietrasiewicz mutex_init(&ffs->mutex); 176200a2430fSAndrzej Pietrasiewicz spin_lock_init(&ffs->eps_lock); 176300a2430fSAndrzej Pietrasiewicz init_waitqueue_head(&ffs->ev.waitq); 1764e16828cfSJerry Zhang init_waitqueue_head(&ffs->wait); 176500a2430fSAndrzej Pietrasiewicz init_completion(&ffs->ep0req_completion); 176600a2430fSAndrzej Pietrasiewicz 176700a2430fSAndrzej Pietrasiewicz /* XXX REVISIT need to update it in some places, or do we? */ 176800a2430fSAndrzej Pietrasiewicz ffs->ev.can_stall = 1; 176900a2430fSAndrzej Pietrasiewicz 177000a2430fSAndrzej Pietrasiewicz return ffs; 177100a2430fSAndrzej Pietrasiewicz } 177200a2430fSAndrzej Pietrasiewicz 177300a2430fSAndrzej Pietrasiewicz static void ffs_data_clear(struct ffs_data *ffs) 177400a2430fSAndrzej Pietrasiewicz { 177500a2430fSAndrzej Pietrasiewicz ENTER(); 177600a2430fSAndrzej Pietrasiewicz 177700a2430fSAndrzej Pietrasiewicz ffs_closed(ffs); 177800a2430fSAndrzej Pietrasiewicz 177900a2430fSAndrzej Pietrasiewicz BUG_ON(ffs->gadget); 178000a2430fSAndrzej Pietrasiewicz 178100a2430fSAndrzej Pietrasiewicz if (ffs->epfiles) 178200a2430fSAndrzej Pietrasiewicz ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count); 178300a2430fSAndrzej Pietrasiewicz 17845e33f6fdSRobert Baldyga if (ffs->ffs_eventfd) 17855e33f6fdSRobert Baldyga eventfd_ctx_put(ffs->ffs_eventfd); 17865e33f6fdSRobert Baldyga 178700a2430fSAndrzej Pietrasiewicz kfree(ffs->raw_descs_data); 178800a2430fSAndrzej Pietrasiewicz kfree(ffs->raw_strings); 178900a2430fSAndrzej Pietrasiewicz kfree(ffs->stringtabs); 179000a2430fSAndrzej Pietrasiewicz } 179100a2430fSAndrzej Pietrasiewicz 179200a2430fSAndrzej Pietrasiewicz static void ffs_data_reset(struct ffs_data *ffs) 179300a2430fSAndrzej Pietrasiewicz { 179400a2430fSAndrzej Pietrasiewicz ENTER(); 179500a2430fSAndrzej Pietrasiewicz 179600a2430fSAndrzej Pietrasiewicz ffs_data_clear(ffs); 179700a2430fSAndrzej Pietrasiewicz 179800a2430fSAndrzej Pietrasiewicz ffs->epfiles = NULL; 179900a2430fSAndrzej Pietrasiewicz ffs->raw_descs_data = NULL; 180000a2430fSAndrzej Pietrasiewicz ffs->raw_descs = NULL; 180100a2430fSAndrzej Pietrasiewicz ffs->raw_strings = NULL; 180200a2430fSAndrzej Pietrasiewicz ffs->stringtabs = NULL; 180300a2430fSAndrzej Pietrasiewicz 180400a2430fSAndrzej Pietrasiewicz ffs->raw_descs_length = 0; 180500a2430fSAndrzej Pietrasiewicz ffs->fs_descs_count = 0; 180600a2430fSAndrzej Pietrasiewicz ffs->hs_descs_count = 0; 180700a2430fSAndrzej Pietrasiewicz ffs->ss_descs_count = 0; 180800a2430fSAndrzej Pietrasiewicz 180900a2430fSAndrzej Pietrasiewicz ffs->strings_count = 0; 181000a2430fSAndrzej Pietrasiewicz ffs->interfaces_count = 0; 181100a2430fSAndrzej Pietrasiewicz ffs->eps_count = 0; 181200a2430fSAndrzej Pietrasiewicz 181300a2430fSAndrzej Pietrasiewicz ffs->ev.count = 0; 181400a2430fSAndrzej Pietrasiewicz 181500a2430fSAndrzej Pietrasiewicz ffs->state = FFS_READ_DESCRIPTORS; 181600a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_NO_SETUP; 181700a2430fSAndrzej Pietrasiewicz ffs->flags = 0; 181800a2430fSAndrzej Pietrasiewicz } 181900a2430fSAndrzej Pietrasiewicz 182000a2430fSAndrzej Pietrasiewicz 182100a2430fSAndrzej Pietrasiewicz static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev) 182200a2430fSAndrzej Pietrasiewicz { 182300a2430fSAndrzej Pietrasiewicz struct usb_gadget_strings **lang; 182400a2430fSAndrzej Pietrasiewicz int first_id; 182500a2430fSAndrzej Pietrasiewicz 182600a2430fSAndrzej Pietrasiewicz ENTER(); 182700a2430fSAndrzej Pietrasiewicz 182800a2430fSAndrzej Pietrasiewicz if (WARN_ON(ffs->state != FFS_ACTIVE 182900a2430fSAndrzej Pietrasiewicz || test_and_set_bit(FFS_FL_BOUND, &ffs->flags))) 183000a2430fSAndrzej Pietrasiewicz return -EBADFD; 183100a2430fSAndrzej Pietrasiewicz 183200a2430fSAndrzej Pietrasiewicz first_id = usb_string_ids_n(cdev, ffs->strings_count); 183300a2430fSAndrzej Pietrasiewicz if (unlikely(first_id < 0)) 183400a2430fSAndrzej Pietrasiewicz return first_id; 183500a2430fSAndrzej Pietrasiewicz 183600a2430fSAndrzej Pietrasiewicz ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL); 183700a2430fSAndrzej Pietrasiewicz if (unlikely(!ffs->ep0req)) 183800a2430fSAndrzej Pietrasiewicz return -ENOMEM; 183900a2430fSAndrzej Pietrasiewicz ffs->ep0req->complete = ffs_ep0_complete; 184000a2430fSAndrzej Pietrasiewicz ffs->ep0req->context = ffs; 184100a2430fSAndrzej Pietrasiewicz 184200a2430fSAndrzej Pietrasiewicz lang = ffs->stringtabs; 184361fe2d75SGreg Kroah-Hartman if (lang) { 184461fe2d75SGreg Kroah-Hartman for (; *lang; ++lang) { 184500a2430fSAndrzej Pietrasiewicz struct usb_string *str = (*lang)->strings; 184600a2430fSAndrzej Pietrasiewicz int id = first_id; 184700a2430fSAndrzej Pietrasiewicz for (; str->s; ++id, ++str) 184800a2430fSAndrzej Pietrasiewicz str->id = id; 184900a2430fSAndrzej Pietrasiewicz } 185061fe2d75SGreg Kroah-Hartman } 185100a2430fSAndrzej Pietrasiewicz 185200a2430fSAndrzej Pietrasiewicz ffs->gadget = cdev->gadget; 185300a2430fSAndrzej Pietrasiewicz ffs_data_get(ffs); 185400a2430fSAndrzej Pietrasiewicz return 0; 185500a2430fSAndrzej Pietrasiewicz } 185600a2430fSAndrzej Pietrasiewicz 185700a2430fSAndrzej Pietrasiewicz static void functionfs_unbind(struct ffs_data *ffs) 185800a2430fSAndrzej Pietrasiewicz { 185900a2430fSAndrzej Pietrasiewicz ENTER(); 186000a2430fSAndrzej Pietrasiewicz 186100a2430fSAndrzej Pietrasiewicz if (!WARN_ON(!ffs->gadget)) { 186200a2430fSAndrzej Pietrasiewicz usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req); 186300a2430fSAndrzej Pietrasiewicz ffs->ep0req = NULL; 186400a2430fSAndrzej Pietrasiewicz ffs->gadget = NULL; 186500a2430fSAndrzej Pietrasiewicz clear_bit(FFS_FL_BOUND, &ffs->flags); 186600a2430fSAndrzej Pietrasiewicz ffs_data_put(ffs); 186700a2430fSAndrzej Pietrasiewicz } 186800a2430fSAndrzej Pietrasiewicz } 186900a2430fSAndrzej Pietrasiewicz 187000a2430fSAndrzej Pietrasiewicz static int ffs_epfiles_create(struct ffs_data *ffs) 187100a2430fSAndrzej Pietrasiewicz { 187200a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile, *epfiles; 187300a2430fSAndrzej Pietrasiewicz unsigned i, count; 187400a2430fSAndrzej Pietrasiewicz 187500a2430fSAndrzej Pietrasiewicz ENTER(); 187600a2430fSAndrzej Pietrasiewicz 187700a2430fSAndrzej Pietrasiewicz count = ffs->eps_count; 187800a2430fSAndrzej Pietrasiewicz epfiles = kcalloc(count, sizeof(*epfiles), GFP_KERNEL); 187900a2430fSAndrzej Pietrasiewicz if (!epfiles) 188000a2430fSAndrzej Pietrasiewicz return -ENOMEM; 188100a2430fSAndrzej Pietrasiewicz 188200a2430fSAndrzej Pietrasiewicz epfile = epfiles; 188300a2430fSAndrzej Pietrasiewicz for (i = 1; i <= count; ++i, ++epfile) { 188400a2430fSAndrzej Pietrasiewicz epfile->ffs = ffs; 188500a2430fSAndrzej Pietrasiewicz mutex_init(&epfile->mutex); 18861b0bf88fSRobert Baldyga if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) 1887acba23feSMario Schuknecht sprintf(epfile->name, "ep%02x", ffs->eps_addrmap[i]); 18881b0bf88fSRobert Baldyga else 1889acba23feSMario Schuknecht sprintf(epfile->name, "ep%u", i); 1890acba23feSMario Schuknecht epfile->dentry = ffs_sb_create_file(ffs->sb, epfile->name, 18911bb27cacSAl Viro epfile, 18921bb27cacSAl Viro &ffs_epfile_operations); 18931bb27cacSAl Viro if (unlikely(!epfile->dentry)) { 189400a2430fSAndrzej Pietrasiewicz ffs_epfiles_destroy(epfiles, i - 1); 189500a2430fSAndrzej Pietrasiewicz return -ENOMEM; 189600a2430fSAndrzej Pietrasiewicz } 189700a2430fSAndrzej Pietrasiewicz } 189800a2430fSAndrzej Pietrasiewicz 189900a2430fSAndrzej Pietrasiewicz ffs->epfiles = epfiles; 190000a2430fSAndrzej Pietrasiewicz return 0; 190100a2430fSAndrzej Pietrasiewicz } 190200a2430fSAndrzej Pietrasiewicz 190300a2430fSAndrzej Pietrasiewicz static void ffs_epfiles_destroy(struct ffs_epfile *epfiles, unsigned count) 190400a2430fSAndrzej Pietrasiewicz { 190500a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = epfiles; 190600a2430fSAndrzej Pietrasiewicz 190700a2430fSAndrzej Pietrasiewicz ENTER(); 190800a2430fSAndrzej Pietrasiewicz 190900a2430fSAndrzej Pietrasiewicz for (; count; --count, ++epfile) { 1910e16828cfSJerry Zhang BUG_ON(mutex_is_locked(&epfile->mutex)); 191100a2430fSAndrzej Pietrasiewicz if (epfile->dentry) { 191200a2430fSAndrzej Pietrasiewicz d_delete(epfile->dentry); 191300a2430fSAndrzej Pietrasiewicz dput(epfile->dentry); 191400a2430fSAndrzej Pietrasiewicz epfile->dentry = NULL; 191500a2430fSAndrzej Pietrasiewicz } 191600a2430fSAndrzej Pietrasiewicz } 191700a2430fSAndrzej Pietrasiewicz 191800a2430fSAndrzej Pietrasiewicz kfree(epfiles); 191900a2430fSAndrzej Pietrasiewicz } 192000a2430fSAndrzej Pietrasiewicz 192100a2430fSAndrzej Pietrasiewicz static void ffs_func_eps_disable(struct ffs_function *func) 192200a2430fSAndrzej Pietrasiewicz { 192300a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = func->eps; 192400a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = func->ffs->epfiles; 192500a2430fSAndrzej Pietrasiewicz unsigned count = func->ffs->eps_count; 192600a2430fSAndrzej Pietrasiewicz unsigned long flags; 192700a2430fSAndrzej Pietrasiewicz 19289353afbbSMichal Nazarewicz spin_lock_irqsave(&func->ffs->eps_lock, flags); 192908f37148SVincent Pelletier while (count--) { 193000a2430fSAndrzej Pietrasiewicz /* pending requests get nuked */ 193100a2430fSAndrzej Pietrasiewicz if (likely(ep->ep)) 193200a2430fSAndrzej Pietrasiewicz usb_ep_disable(ep->ep); 193300a2430fSAndrzej Pietrasiewicz ++ep; 193418d6b32fSRobert Baldyga 193518d6b32fSRobert Baldyga if (epfile) { 1936a9e6f83cSMichal Nazarewicz epfile->ep = NULL; 1937a9e6f83cSMichal Nazarewicz __ffs_epfile_read_buffer_free(epfile); 193800a2430fSAndrzej Pietrasiewicz ++epfile; 193918d6b32fSRobert Baldyga } 194008f37148SVincent Pelletier } 1941a9e6f83cSMichal Nazarewicz spin_unlock_irqrestore(&func->ffs->eps_lock, flags); 194200a2430fSAndrzej Pietrasiewicz } 194300a2430fSAndrzej Pietrasiewicz 194400a2430fSAndrzej Pietrasiewicz static int ffs_func_eps_enable(struct ffs_function *func) 194500a2430fSAndrzej Pietrasiewicz { 194600a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 194700a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = func->eps; 194800a2430fSAndrzej Pietrasiewicz struct ffs_epfile *epfile = ffs->epfiles; 194900a2430fSAndrzej Pietrasiewicz unsigned count = ffs->eps_count; 195000a2430fSAndrzej Pietrasiewicz unsigned long flags; 195100a2430fSAndrzej Pietrasiewicz int ret = 0; 195200a2430fSAndrzej Pietrasiewicz 195300a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&func->ffs->eps_lock, flags); 195408f37148SVincent Pelletier while(count--) { 195500a2430fSAndrzej Pietrasiewicz ep->ep->driver_data = ep; 19562bfa0719SFelipe Balbi 1957675272d0SJack Pham ret = config_ep_by_speed(func->gadget, &func->function, ep->ep); 1958675272d0SJack Pham if (ret) { 1959675272d0SJack Pham pr_err("%s: config_ep_by_speed(%s) returned %d\n", 1960675272d0SJack Pham __func__, ep->ep->name, ret); 1961675272d0SJack Pham break; 1962b7f73850SWilliam Wu } 19632bfa0719SFelipe Balbi 196400a2430fSAndrzej Pietrasiewicz ret = usb_ep_enable(ep->ep); 196500a2430fSAndrzej Pietrasiewicz if (likely(!ret)) { 196600a2430fSAndrzej Pietrasiewicz epfile->ep = ep; 1967675272d0SJack Pham epfile->in = usb_endpoint_dir_in(ep->ep->desc); 1968675272d0SJack Pham epfile->isoc = usb_endpoint_xfer_isoc(ep->ep->desc); 196900a2430fSAndrzej Pietrasiewicz } else { 197000a2430fSAndrzej Pietrasiewicz break; 197100a2430fSAndrzej Pietrasiewicz } 197200a2430fSAndrzej Pietrasiewicz 197300a2430fSAndrzej Pietrasiewicz ++ep; 197400a2430fSAndrzej Pietrasiewicz ++epfile; 197508f37148SVincent Pelletier } 1976e16828cfSJerry Zhang 1977e16828cfSJerry Zhang wake_up_interruptible(&ffs->wait); 197800a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&func->ffs->eps_lock, flags); 197900a2430fSAndrzej Pietrasiewicz 198000a2430fSAndrzej Pietrasiewicz return ret; 198100a2430fSAndrzej Pietrasiewicz } 198200a2430fSAndrzej Pietrasiewicz 198300a2430fSAndrzej Pietrasiewicz 198400a2430fSAndrzej Pietrasiewicz /* Parsing and building descriptors and strings *****************************/ 198500a2430fSAndrzej Pietrasiewicz 198600a2430fSAndrzej Pietrasiewicz /* 198700a2430fSAndrzej Pietrasiewicz * This validates if data pointed by data is a valid USB descriptor as 198800a2430fSAndrzej Pietrasiewicz * well as record how many interfaces, endpoints and strings are 198900a2430fSAndrzej Pietrasiewicz * required by given configuration. Returns address after the 199000a2430fSAndrzej Pietrasiewicz * descriptor or NULL if data is invalid. 199100a2430fSAndrzej Pietrasiewicz */ 199200a2430fSAndrzej Pietrasiewicz 199300a2430fSAndrzej Pietrasiewicz enum ffs_entity_type { 199400a2430fSAndrzej Pietrasiewicz FFS_DESCRIPTOR, FFS_INTERFACE, FFS_STRING, FFS_ENDPOINT 199500a2430fSAndrzej Pietrasiewicz }; 199600a2430fSAndrzej Pietrasiewicz 199700a2430fSAndrzej Pietrasiewicz enum ffs_os_desc_type { 199800a2430fSAndrzej Pietrasiewicz FFS_OS_DESC, FFS_OS_DESC_EXT_COMPAT, FFS_OS_DESC_EXT_PROP 199900a2430fSAndrzej Pietrasiewicz }; 200000a2430fSAndrzej Pietrasiewicz 200100a2430fSAndrzej Pietrasiewicz typedef int (*ffs_entity_callback)(enum ffs_entity_type entity, 200200a2430fSAndrzej Pietrasiewicz u8 *valuep, 200300a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *desc, 200400a2430fSAndrzej Pietrasiewicz void *priv); 200500a2430fSAndrzej Pietrasiewicz 200600a2430fSAndrzej Pietrasiewicz typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, 200700a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h, void *data, 200800a2430fSAndrzej Pietrasiewicz unsigned len, void *priv); 200900a2430fSAndrzej Pietrasiewicz 201000a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_single_desc(char *data, unsigned len, 201100a2430fSAndrzej Pietrasiewicz ffs_entity_callback entity, 20127f7c548cSVincent Pelletier void *priv, int *current_class) 201300a2430fSAndrzej Pietrasiewicz { 201400a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *_ds = (void *)data; 201500a2430fSAndrzej Pietrasiewicz u8 length; 201600a2430fSAndrzej Pietrasiewicz int ret; 201700a2430fSAndrzej Pietrasiewicz 201800a2430fSAndrzej Pietrasiewicz ENTER(); 201900a2430fSAndrzej Pietrasiewicz 202000a2430fSAndrzej Pietrasiewicz /* At least two bytes are required: length and type */ 202100a2430fSAndrzej Pietrasiewicz if (len < 2) { 202200a2430fSAndrzej Pietrasiewicz pr_vdebug("descriptor too short\n"); 202300a2430fSAndrzej Pietrasiewicz return -EINVAL; 202400a2430fSAndrzej Pietrasiewicz } 202500a2430fSAndrzej Pietrasiewicz 202600a2430fSAndrzej Pietrasiewicz /* If we have at least as many bytes as the descriptor takes? */ 202700a2430fSAndrzej Pietrasiewicz length = _ds->bLength; 202800a2430fSAndrzej Pietrasiewicz if (len < length) { 202900a2430fSAndrzej Pietrasiewicz pr_vdebug("descriptor longer then available data\n"); 203000a2430fSAndrzej Pietrasiewicz return -EINVAL; 203100a2430fSAndrzej Pietrasiewicz } 203200a2430fSAndrzej Pietrasiewicz 203300a2430fSAndrzej Pietrasiewicz #define __entity_check_INTERFACE(val) 1 203400a2430fSAndrzej Pietrasiewicz #define __entity_check_STRING(val) (val) 203500a2430fSAndrzej Pietrasiewicz #define __entity_check_ENDPOINT(val) ((val) & USB_ENDPOINT_NUMBER_MASK) 203600a2430fSAndrzej Pietrasiewicz #define __entity(type, val) do { \ 203700a2430fSAndrzej Pietrasiewicz pr_vdebug("entity " #type "(%02x)\n", (val)); \ 203800a2430fSAndrzej Pietrasiewicz if (unlikely(!__entity_check_ ##type(val))) { \ 203900a2430fSAndrzej Pietrasiewicz pr_vdebug("invalid entity's value\n"); \ 204000a2430fSAndrzej Pietrasiewicz return -EINVAL; \ 204100a2430fSAndrzej Pietrasiewicz } \ 204200a2430fSAndrzej Pietrasiewicz ret = entity(FFS_ ##type, &val, _ds, priv); \ 204300a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { \ 204400a2430fSAndrzej Pietrasiewicz pr_debug("entity " #type "(%02x); ret = %d\n", \ 204500a2430fSAndrzej Pietrasiewicz (val), ret); \ 204600a2430fSAndrzej Pietrasiewicz return ret; \ 204700a2430fSAndrzej Pietrasiewicz } \ 204800a2430fSAndrzej Pietrasiewicz } while (0) 204900a2430fSAndrzej Pietrasiewicz 205000a2430fSAndrzej Pietrasiewicz /* Parse descriptor depending on type. */ 205100a2430fSAndrzej Pietrasiewicz switch (_ds->bDescriptorType) { 205200a2430fSAndrzej Pietrasiewicz case USB_DT_DEVICE: 205300a2430fSAndrzej Pietrasiewicz case USB_DT_CONFIG: 205400a2430fSAndrzej Pietrasiewicz case USB_DT_STRING: 205500a2430fSAndrzej Pietrasiewicz case USB_DT_DEVICE_QUALIFIER: 205600a2430fSAndrzej Pietrasiewicz /* function can't have any of those */ 205700a2430fSAndrzej Pietrasiewicz pr_vdebug("descriptor reserved for gadget: %d\n", 205800a2430fSAndrzej Pietrasiewicz _ds->bDescriptorType); 205900a2430fSAndrzej Pietrasiewicz return -EINVAL; 206000a2430fSAndrzej Pietrasiewicz 206100a2430fSAndrzej Pietrasiewicz case USB_DT_INTERFACE: { 206200a2430fSAndrzej Pietrasiewicz struct usb_interface_descriptor *ds = (void *)_ds; 206300a2430fSAndrzej Pietrasiewicz pr_vdebug("interface descriptor\n"); 206400a2430fSAndrzej Pietrasiewicz if (length != sizeof *ds) 206500a2430fSAndrzej Pietrasiewicz goto inv_length; 206600a2430fSAndrzej Pietrasiewicz 206700a2430fSAndrzej Pietrasiewicz __entity(INTERFACE, ds->bInterfaceNumber); 206800a2430fSAndrzej Pietrasiewicz if (ds->iInterface) 206900a2430fSAndrzej Pietrasiewicz __entity(STRING, ds->iInterface); 20707f7c548cSVincent Pelletier *current_class = ds->bInterfaceClass; 207100a2430fSAndrzej Pietrasiewicz } 207200a2430fSAndrzej Pietrasiewicz break; 207300a2430fSAndrzej Pietrasiewicz 207400a2430fSAndrzej Pietrasiewicz case USB_DT_ENDPOINT: { 207500a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *ds = (void *)_ds; 207600a2430fSAndrzej Pietrasiewicz pr_vdebug("endpoint descriptor\n"); 207700a2430fSAndrzej Pietrasiewicz if (length != USB_DT_ENDPOINT_SIZE && 207800a2430fSAndrzej Pietrasiewicz length != USB_DT_ENDPOINT_AUDIO_SIZE) 207900a2430fSAndrzej Pietrasiewicz goto inv_length; 208000a2430fSAndrzej Pietrasiewicz __entity(ENDPOINT, ds->bEndpointAddress); 208100a2430fSAndrzej Pietrasiewicz } 208200a2430fSAndrzej Pietrasiewicz break; 208300a2430fSAndrzej Pietrasiewicz 20847f7c548cSVincent Pelletier case USB_TYPE_CLASS | 0x01: 20857f7c548cSVincent Pelletier if (*current_class == USB_INTERFACE_CLASS_HID) { 208600a2430fSAndrzej Pietrasiewicz pr_vdebug("hid descriptor\n"); 208700a2430fSAndrzej Pietrasiewicz if (length != sizeof(struct hid_descriptor)) 208800a2430fSAndrzej Pietrasiewicz goto inv_length; 208900a2430fSAndrzej Pietrasiewicz break; 20907f7c548cSVincent Pelletier } else if (*current_class == USB_INTERFACE_CLASS_CCID) { 20917f7c548cSVincent Pelletier pr_vdebug("ccid descriptor\n"); 20927f7c548cSVincent Pelletier if (length != sizeof(struct ccid_descriptor)) 20937f7c548cSVincent Pelletier goto inv_length; 20947f7c548cSVincent Pelletier break; 20957f7c548cSVincent Pelletier } else { 20967f7c548cSVincent Pelletier pr_vdebug("unknown descriptor: %d for class %d\n", 20977f7c548cSVincent Pelletier _ds->bDescriptorType, *current_class); 20987f7c548cSVincent Pelletier return -EINVAL; 20997f7c548cSVincent Pelletier } 210000a2430fSAndrzej Pietrasiewicz 210100a2430fSAndrzej Pietrasiewicz case USB_DT_OTG: 210200a2430fSAndrzej Pietrasiewicz if (length != sizeof(struct usb_otg_descriptor)) 210300a2430fSAndrzej Pietrasiewicz goto inv_length; 210400a2430fSAndrzej Pietrasiewicz break; 210500a2430fSAndrzej Pietrasiewicz 210600a2430fSAndrzej Pietrasiewicz case USB_DT_INTERFACE_ASSOCIATION: { 210700a2430fSAndrzej Pietrasiewicz struct usb_interface_assoc_descriptor *ds = (void *)_ds; 210800a2430fSAndrzej Pietrasiewicz pr_vdebug("interface association descriptor\n"); 210900a2430fSAndrzej Pietrasiewicz if (length != sizeof *ds) 211000a2430fSAndrzej Pietrasiewicz goto inv_length; 211100a2430fSAndrzej Pietrasiewicz if (ds->iFunction) 211200a2430fSAndrzej Pietrasiewicz __entity(STRING, ds->iFunction); 211300a2430fSAndrzej Pietrasiewicz } 211400a2430fSAndrzej Pietrasiewicz break; 211500a2430fSAndrzej Pietrasiewicz 211600a2430fSAndrzej Pietrasiewicz case USB_DT_SS_ENDPOINT_COMP: 211700a2430fSAndrzej Pietrasiewicz pr_vdebug("EP SS companion descriptor\n"); 211800a2430fSAndrzej Pietrasiewicz if (length != sizeof(struct usb_ss_ep_comp_descriptor)) 211900a2430fSAndrzej Pietrasiewicz goto inv_length; 212000a2430fSAndrzej Pietrasiewicz break; 212100a2430fSAndrzej Pietrasiewicz 212200a2430fSAndrzej Pietrasiewicz case USB_DT_OTHER_SPEED_CONFIG: 212300a2430fSAndrzej Pietrasiewicz case USB_DT_INTERFACE_POWER: 212400a2430fSAndrzej Pietrasiewicz case USB_DT_DEBUG: 212500a2430fSAndrzej Pietrasiewicz case USB_DT_SECURITY: 212600a2430fSAndrzej Pietrasiewicz case USB_DT_CS_RADIO_CONTROL: 212700a2430fSAndrzej Pietrasiewicz /* TODO */ 212800a2430fSAndrzej Pietrasiewicz pr_vdebug("unimplemented descriptor: %d\n", _ds->bDescriptorType); 212900a2430fSAndrzej Pietrasiewicz return -EINVAL; 213000a2430fSAndrzej Pietrasiewicz 213100a2430fSAndrzej Pietrasiewicz default: 213200a2430fSAndrzej Pietrasiewicz /* We should never be here */ 213300a2430fSAndrzej Pietrasiewicz pr_vdebug("unknown descriptor: %d\n", _ds->bDescriptorType); 213400a2430fSAndrzej Pietrasiewicz return -EINVAL; 213500a2430fSAndrzej Pietrasiewicz 213600a2430fSAndrzej Pietrasiewicz inv_length: 213700a2430fSAndrzej Pietrasiewicz pr_vdebug("invalid length: %d (descriptor %d)\n", 213800a2430fSAndrzej Pietrasiewicz _ds->bLength, _ds->bDescriptorType); 213900a2430fSAndrzej Pietrasiewicz return -EINVAL; 214000a2430fSAndrzej Pietrasiewicz } 214100a2430fSAndrzej Pietrasiewicz 214200a2430fSAndrzej Pietrasiewicz #undef __entity 214300a2430fSAndrzej Pietrasiewicz #undef __entity_check_DESCRIPTOR 214400a2430fSAndrzej Pietrasiewicz #undef __entity_check_INTERFACE 214500a2430fSAndrzej Pietrasiewicz #undef __entity_check_STRING 214600a2430fSAndrzej Pietrasiewicz #undef __entity_check_ENDPOINT 214700a2430fSAndrzej Pietrasiewicz 214800a2430fSAndrzej Pietrasiewicz return length; 214900a2430fSAndrzej Pietrasiewicz } 215000a2430fSAndrzej Pietrasiewicz 215100a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, 215200a2430fSAndrzej Pietrasiewicz ffs_entity_callback entity, void *priv) 215300a2430fSAndrzej Pietrasiewicz { 215400a2430fSAndrzej Pietrasiewicz const unsigned _len = len; 215500a2430fSAndrzej Pietrasiewicz unsigned long num = 0; 21567f7c548cSVincent Pelletier int current_class = -1; 215700a2430fSAndrzej Pietrasiewicz 215800a2430fSAndrzej Pietrasiewicz ENTER(); 215900a2430fSAndrzej Pietrasiewicz 216000a2430fSAndrzej Pietrasiewicz for (;;) { 216100a2430fSAndrzej Pietrasiewicz int ret; 216200a2430fSAndrzej Pietrasiewicz 216300a2430fSAndrzej Pietrasiewicz if (num == count) 216400a2430fSAndrzej Pietrasiewicz data = NULL; 216500a2430fSAndrzej Pietrasiewicz 216600a2430fSAndrzej Pietrasiewicz /* Record "descriptor" entity */ 216700a2430fSAndrzej Pietrasiewicz ret = entity(FFS_DESCRIPTOR, (u8 *)num, (void *)data, priv); 216800a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 216900a2430fSAndrzej Pietrasiewicz pr_debug("entity DESCRIPTOR(%02lx); ret = %d\n", 217000a2430fSAndrzej Pietrasiewicz num, ret); 217100a2430fSAndrzej Pietrasiewicz return ret; 217200a2430fSAndrzej Pietrasiewicz } 217300a2430fSAndrzej Pietrasiewicz 217400a2430fSAndrzej Pietrasiewicz if (!data) 217500a2430fSAndrzej Pietrasiewicz return _len - len; 217600a2430fSAndrzej Pietrasiewicz 21777f7c548cSVincent Pelletier ret = ffs_do_single_desc(data, len, entity, priv, 21787f7c548cSVincent Pelletier ¤t_class); 217900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 218000a2430fSAndrzej Pietrasiewicz pr_debug("%s returns %d\n", __func__, ret); 218100a2430fSAndrzej Pietrasiewicz return ret; 218200a2430fSAndrzej Pietrasiewicz } 218300a2430fSAndrzej Pietrasiewicz 218400a2430fSAndrzej Pietrasiewicz len -= ret; 218500a2430fSAndrzej Pietrasiewicz data += ret; 218600a2430fSAndrzej Pietrasiewicz ++num; 218700a2430fSAndrzej Pietrasiewicz } 218800a2430fSAndrzej Pietrasiewicz } 218900a2430fSAndrzej Pietrasiewicz 219000a2430fSAndrzej Pietrasiewicz static int __ffs_data_do_entity(enum ffs_entity_type type, 219100a2430fSAndrzej Pietrasiewicz u8 *valuep, struct usb_descriptor_header *desc, 219200a2430fSAndrzej Pietrasiewicz void *priv) 219300a2430fSAndrzej Pietrasiewicz { 21946d5c1c77SRobert Baldyga struct ffs_desc_helper *helper = priv; 21956d5c1c77SRobert Baldyga struct usb_endpoint_descriptor *d; 219600a2430fSAndrzej Pietrasiewicz 219700a2430fSAndrzej Pietrasiewicz ENTER(); 219800a2430fSAndrzej Pietrasiewicz 219900a2430fSAndrzej Pietrasiewicz switch (type) { 220000a2430fSAndrzej Pietrasiewicz case FFS_DESCRIPTOR: 220100a2430fSAndrzej Pietrasiewicz break; 220200a2430fSAndrzej Pietrasiewicz 220300a2430fSAndrzej Pietrasiewicz case FFS_INTERFACE: 220400a2430fSAndrzej Pietrasiewicz /* 220500a2430fSAndrzej Pietrasiewicz * Interfaces are indexed from zero so if we 220600a2430fSAndrzej Pietrasiewicz * encountered interface "n" then there are at least 220700a2430fSAndrzej Pietrasiewicz * "n+1" interfaces. 220800a2430fSAndrzej Pietrasiewicz */ 22096d5c1c77SRobert Baldyga if (*valuep >= helper->interfaces_count) 22106d5c1c77SRobert Baldyga helper->interfaces_count = *valuep + 1; 221100a2430fSAndrzej Pietrasiewicz break; 221200a2430fSAndrzej Pietrasiewicz 221300a2430fSAndrzej Pietrasiewicz case FFS_STRING: 221400a2430fSAndrzej Pietrasiewicz /* 221596a420d2SVincent Pelletier * Strings are indexed from 1 (0 is reserved 221696a420d2SVincent Pelletier * for languages list) 221700a2430fSAndrzej Pietrasiewicz */ 22186d5c1c77SRobert Baldyga if (*valuep > helper->ffs->strings_count) 22196d5c1c77SRobert Baldyga helper->ffs->strings_count = *valuep; 222000a2430fSAndrzej Pietrasiewicz break; 222100a2430fSAndrzej Pietrasiewicz 222200a2430fSAndrzej Pietrasiewicz case FFS_ENDPOINT: 22236d5c1c77SRobert Baldyga d = (void *)desc; 22246d5c1c77SRobert Baldyga helper->eps_count++; 222541dc9ac1SVincent Pelletier if (helper->eps_count >= FFS_MAX_EPS_COUNT) 22266d5c1c77SRobert Baldyga return -EINVAL; 22276d5c1c77SRobert Baldyga /* Check if descriptors for any speed were already parsed */ 22286d5c1c77SRobert Baldyga if (!helper->ffs->eps_count && !helper->ffs->interfaces_count) 22296d5c1c77SRobert Baldyga helper->ffs->eps_addrmap[helper->eps_count] = 22306d5c1c77SRobert Baldyga d->bEndpointAddress; 22316d5c1c77SRobert Baldyga else if (helper->ffs->eps_addrmap[helper->eps_count] != 22326d5c1c77SRobert Baldyga d->bEndpointAddress) 22336d5c1c77SRobert Baldyga return -EINVAL; 223400a2430fSAndrzej Pietrasiewicz break; 223500a2430fSAndrzej Pietrasiewicz } 223600a2430fSAndrzej Pietrasiewicz 223700a2430fSAndrzej Pietrasiewicz return 0; 223800a2430fSAndrzej Pietrasiewicz } 223900a2430fSAndrzej Pietrasiewicz 224000a2430fSAndrzej Pietrasiewicz static int __ffs_do_os_desc_header(enum ffs_os_desc_type *next_type, 224100a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *desc) 224200a2430fSAndrzej Pietrasiewicz { 224300a2430fSAndrzej Pietrasiewicz u16 bcd_version = le16_to_cpu(desc->bcdVersion); 224400a2430fSAndrzej Pietrasiewicz u16 w_index = le16_to_cpu(desc->wIndex); 224500a2430fSAndrzej Pietrasiewicz 224600a2430fSAndrzej Pietrasiewicz if (bcd_version != 1) { 224700a2430fSAndrzej Pietrasiewicz pr_vdebug("unsupported os descriptors version: %d", 224800a2430fSAndrzej Pietrasiewicz bcd_version); 224900a2430fSAndrzej Pietrasiewicz return -EINVAL; 225000a2430fSAndrzej Pietrasiewicz } 225100a2430fSAndrzej Pietrasiewicz switch (w_index) { 225200a2430fSAndrzej Pietrasiewicz case 0x4: 225300a2430fSAndrzej Pietrasiewicz *next_type = FFS_OS_DESC_EXT_COMPAT; 225400a2430fSAndrzej Pietrasiewicz break; 225500a2430fSAndrzej Pietrasiewicz case 0x5: 225600a2430fSAndrzej Pietrasiewicz *next_type = FFS_OS_DESC_EXT_PROP; 225700a2430fSAndrzej Pietrasiewicz break; 225800a2430fSAndrzej Pietrasiewicz default: 225900a2430fSAndrzej Pietrasiewicz pr_vdebug("unsupported os descriptor type: %d", w_index); 226000a2430fSAndrzej Pietrasiewicz return -EINVAL; 226100a2430fSAndrzej Pietrasiewicz } 226200a2430fSAndrzej Pietrasiewicz 226300a2430fSAndrzej Pietrasiewicz return sizeof(*desc); 226400a2430fSAndrzej Pietrasiewicz } 226500a2430fSAndrzej Pietrasiewicz 226600a2430fSAndrzej Pietrasiewicz /* 226700a2430fSAndrzej Pietrasiewicz * Process all extended compatibility/extended property descriptors 226800a2430fSAndrzej Pietrasiewicz * of a feature descriptor 226900a2430fSAndrzej Pietrasiewicz */ 227000a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_single_os_desc(char *data, unsigned len, 227100a2430fSAndrzej Pietrasiewicz enum ffs_os_desc_type type, 227200a2430fSAndrzej Pietrasiewicz u16 feature_count, 227300a2430fSAndrzej Pietrasiewicz ffs_os_desc_callback entity, 227400a2430fSAndrzej Pietrasiewicz void *priv, 227500a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h) 227600a2430fSAndrzej Pietrasiewicz { 227700a2430fSAndrzej Pietrasiewicz int ret; 227800a2430fSAndrzej Pietrasiewicz const unsigned _len = len; 227900a2430fSAndrzej Pietrasiewicz 228000a2430fSAndrzej Pietrasiewicz ENTER(); 228100a2430fSAndrzej Pietrasiewicz 228200a2430fSAndrzej Pietrasiewicz /* loop over all ext compat/ext prop descriptors */ 228300a2430fSAndrzej Pietrasiewicz while (feature_count--) { 228400a2430fSAndrzej Pietrasiewicz ret = entity(type, h, data, len, priv); 228500a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 228600a2430fSAndrzej Pietrasiewicz pr_debug("bad OS descriptor, type: %d\n", type); 228700a2430fSAndrzej Pietrasiewicz return ret; 228800a2430fSAndrzej Pietrasiewicz } 228900a2430fSAndrzej Pietrasiewicz data += ret; 229000a2430fSAndrzej Pietrasiewicz len -= ret; 229100a2430fSAndrzej Pietrasiewicz } 229200a2430fSAndrzej Pietrasiewicz return _len - len; 229300a2430fSAndrzej Pietrasiewicz } 229400a2430fSAndrzej Pietrasiewicz 229500a2430fSAndrzej Pietrasiewicz /* Process a number of complete Feature Descriptors (Ext Compat or Ext Prop) */ 229600a2430fSAndrzej Pietrasiewicz static int __must_check ffs_do_os_descs(unsigned count, 229700a2430fSAndrzej Pietrasiewicz char *data, unsigned len, 229800a2430fSAndrzej Pietrasiewicz ffs_os_desc_callback entity, void *priv) 229900a2430fSAndrzej Pietrasiewicz { 230000a2430fSAndrzej Pietrasiewicz const unsigned _len = len; 230100a2430fSAndrzej Pietrasiewicz unsigned long num = 0; 230200a2430fSAndrzej Pietrasiewicz 230300a2430fSAndrzej Pietrasiewicz ENTER(); 230400a2430fSAndrzej Pietrasiewicz 230500a2430fSAndrzej Pietrasiewicz for (num = 0; num < count; ++num) { 230600a2430fSAndrzej Pietrasiewicz int ret; 230700a2430fSAndrzej Pietrasiewicz enum ffs_os_desc_type type; 230800a2430fSAndrzej Pietrasiewicz u16 feature_count; 230900a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *desc = (void *)data; 231000a2430fSAndrzej Pietrasiewicz 231100a2430fSAndrzej Pietrasiewicz if (len < sizeof(*desc)) 231200a2430fSAndrzej Pietrasiewicz return -EINVAL; 231300a2430fSAndrzej Pietrasiewicz 231400a2430fSAndrzej Pietrasiewicz /* 231500a2430fSAndrzej Pietrasiewicz * Record "descriptor" entity. 231600a2430fSAndrzej Pietrasiewicz * Process dwLength, bcdVersion, wIndex, get b/wCount. 231700a2430fSAndrzej Pietrasiewicz * Move the data pointer to the beginning of extended 231800a2430fSAndrzej Pietrasiewicz * compatibilities proper or extended properties proper 231900a2430fSAndrzej Pietrasiewicz * portions of the data 232000a2430fSAndrzej Pietrasiewicz */ 232100a2430fSAndrzej Pietrasiewicz if (le32_to_cpu(desc->dwLength) > len) 232200a2430fSAndrzej Pietrasiewicz return -EINVAL; 232300a2430fSAndrzej Pietrasiewicz 232400a2430fSAndrzej Pietrasiewicz ret = __ffs_do_os_desc_header(&type, desc); 232500a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 232600a2430fSAndrzej Pietrasiewicz pr_debug("entity OS_DESCRIPTOR(%02lx); ret = %d\n", 232700a2430fSAndrzej Pietrasiewicz num, ret); 232800a2430fSAndrzej Pietrasiewicz return ret; 232900a2430fSAndrzej Pietrasiewicz } 233000a2430fSAndrzej Pietrasiewicz /* 233100a2430fSAndrzej Pietrasiewicz * 16-bit hex "?? 00" Little Endian looks like 8-bit hex "??" 233200a2430fSAndrzej Pietrasiewicz */ 233300a2430fSAndrzej Pietrasiewicz feature_count = le16_to_cpu(desc->wCount); 233400a2430fSAndrzej Pietrasiewicz if (type == FFS_OS_DESC_EXT_COMPAT && 233500a2430fSAndrzej Pietrasiewicz (feature_count > 255 || desc->Reserved)) 233600a2430fSAndrzej Pietrasiewicz return -EINVAL; 233700a2430fSAndrzej Pietrasiewicz len -= ret; 233800a2430fSAndrzej Pietrasiewicz data += ret; 233900a2430fSAndrzej Pietrasiewicz 234000a2430fSAndrzej Pietrasiewicz /* 234100a2430fSAndrzej Pietrasiewicz * Process all function/property descriptors 234200a2430fSAndrzej Pietrasiewicz * of this Feature Descriptor 234300a2430fSAndrzej Pietrasiewicz */ 234400a2430fSAndrzej Pietrasiewicz ret = ffs_do_single_os_desc(data, len, type, 234500a2430fSAndrzej Pietrasiewicz feature_count, entity, priv, desc); 234600a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) { 234700a2430fSAndrzej Pietrasiewicz pr_debug("%s returns %d\n", __func__, ret); 234800a2430fSAndrzej Pietrasiewicz return ret; 234900a2430fSAndrzej Pietrasiewicz } 235000a2430fSAndrzej Pietrasiewicz 235100a2430fSAndrzej Pietrasiewicz len -= ret; 235200a2430fSAndrzej Pietrasiewicz data += ret; 235300a2430fSAndrzej Pietrasiewicz } 235400a2430fSAndrzej Pietrasiewicz return _len - len; 235500a2430fSAndrzej Pietrasiewicz } 235600a2430fSAndrzej Pietrasiewicz 235700a2430fSAndrzej Pietrasiewicz /** 235800a2430fSAndrzej Pietrasiewicz * Validate contents of the buffer from userspace related to OS descriptors. 235900a2430fSAndrzej Pietrasiewicz */ 236000a2430fSAndrzej Pietrasiewicz static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, 236100a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h, void *data, 236200a2430fSAndrzej Pietrasiewicz unsigned len, void *priv) 236300a2430fSAndrzej Pietrasiewicz { 236400a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = priv; 236500a2430fSAndrzej Pietrasiewicz u8 length; 236600a2430fSAndrzej Pietrasiewicz 236700a2430fSAndrzej Pietrasiewicz ENTER(); 236800a2430fSAndrzej Pietrasiewicz 236900a2430fSAndrzej Pietrasiewicz switch (type) { 237000a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_COMPAT: { 237100a2430fSAndrzej Pietrasiewicz struct usb_ext_compat_desc *d = data; 237200a2430fSAndrzej Pietrasiewicz int i; 237300a2430fSAndrzej Pietrasiewicz 237400a2430fSAndrzej Pietrasiewicz if (len < sizeof(*d) || 2375a3acc696SJohn Keeping d->bFirstInterfaceNumber >= ffs->interfaces_count) 237600a2430fSAndrzej Pietrasiewicz return -EINVAL; 2377a3acc696SJohn Keeping if (d->Reserved1 != 1) { 2378a3acc696SJohn Keeping /* 2379a3acc696SJohn Keeping * According to the spec, Reserved1 must be set to 1 2380a3acc696SJohn Keeping * but older kernels incorrectly rejected non-zero 2381a3acc696SJohn Keeping * values. We fix it here to avoid returning EINVAL 2382a3acc696SJohn Keeping * in response to values we used to accept. 2383a3acc696SJohn Keeping */ 2384a3acc696SJohn Keeping pr_debug("usb_ext_compat_desc::Reserved1 forced to 1\n"); 2385a3acc696SJohn Keeping d->Reserved1 = 1; 2386a3acc696SJohn Keeping } 238700a2430fSAndrzej Pietrasiewicz for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) 238800a2430fSAndrzej Pietrasiewicz if (d->Reserved2[i]) 238900a2430fSAndrzej Pietrasiewicz return -EINVAL; 239000a2430fSAndrzej Pietrasiewicz 239100a2430fSAndrzej Pietrasiewicz length = sizeof(struct usb_ext_compat_desc); 239200a2430fSAndrzej Pietrasiewicz } 239300a2430fSAndrzej Pietrasiewicz break; 239400a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_PROP: { 239500a2430fSAndrzej Pietrasiewicz struct usb_ext_prop_desc *d = data; 239600a2430fSAndrzej Pietrasiewicz u32 type, pdl; 239700a2430fSAndrzej Pietrasiewicz u16 pnl; 239800a2430fSAndrzej Pietrasiewicz 239900a2430fSAndrzej Pietrasiewicz if (len < sizeof(*d) || h->interface >= ffs->interfaces_count) 240000a2430fSAndrzej Pietrasiewicz return -EINVAL; 240100a2430fSAndrzej Pietrasiewicz length = le32_to_cpu(d->dwSize); 240283e526f2SVincent Pelletier if (len < length) 240383e526f2SVincent Pelletier return -EINVAL; 240400a2430fSAndrzej Pietrasiewicz type = le32_to_cpu(d->dwPropertyDataType); 240500a2430fSAndrzej Pietrasiewicz if (type < USB_EXT_PROP_UNICODE || 240600a2430fSAndrzej Pietrasiewicz type > USB_EXT_PROP_UNICODE_MULTI) { 240700a2430fSAndrzej Pietrasiewicz pr_vdebug("unsupported os descriptor property type: %d", 240800a2430fSAndrzej Pietrasiewicz type); 240900a2430fSAndrzej Pietrasiewicz return -EINVAL; 241000a2430fSAndrzej Pietrasiewicz } 241100a2430fSAndrzej Pietrasiewicz pnl = le16_to_cpu(d->wPropertyNameLength); 241283e526f2SVincent Pelletier if (length < 14 + pnl) { 241383e526f2SVincent Pelletier pr_vdebug("invalid os descriptor length: %d pnl:%d (descriptor %d)\n", 241483e526f2SVincent Pelletier length, pnl, type); 241583e526f2SVincent Pelletier return -EINVAL; 241683e526f2SVincent Pelletier } 2417c40619bbSVincent Pelletier pdl = le32_to_cpu(*(__le32 *)((u8 *)data + 10 + pnl)); 241800a2430fSAndrzej Pietrasiewicz if (length != 14 + pnl + pdl) { 241900a2430fSAndrzej Pietrasiewicz pr_vdebug("invalid os descriptor length: %d pnl:%d pdl:%d (descriptor %d)\n", 242000a2430fSAndrzej Pietrasiewicz length, pnl, pdl, type); 242100a2430fSAndrzej Pietrasiewicz return -EINVAL; 242200a2430fSAndrzej Pietrasiewicz } 242300a2430fSAndrzej Pietrasiewicz ++ffs->ms_os_descs_ext_prop_count; 242400a2430fSAndrzej Pietrasiewicz /* property name reported to the host as "WCHAR"s */ 242500a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_name_len += pnl * 2; 242600a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_data_len += pdl; 242700a2430fSAndrzej Pietrasiewicz } 242800a2430fSAndrzej Pietrasiewicz break; 242900a2430fSAndrzej Pietrasiewicz default: 243000a2430fSAndrzej Pietrasiewicz pr_vdebug("unknown descriptor: %d\n", type); 243100a2430fSAndrzej Pietrasiewicz return -EINVAL; 243200a2430fSAndrzej Pietrasiewicz } 243300a2430fSAndrzej Pietrasiewicz return length; 243400a2430fSAndrzej Pietrasiewicz } 243500a2430fSAndrzej Pietrasiewicz 243600a2430fSAndrzej Pietrasiewicz static int __ffs_data_got_descs(struct ffs_data *ffs, 243700a2430fSAndrzej Pietrasiewicz char *const _data, size_t len) 243800a2430fSAndrzej Pietrasiewicz { 243900a2430fSAndrzej Pietrasiewicz char *data = _data, *raw_descs; 244000a2430fSAndrzej Pietrasiewicz unsigned os_descs_count = 0, counts[3], flags; 244100a2430fSAndrzej Pietrasiewicz int ret = -EINVAL, i; 24426d5c1c77SRobert Baldyga struct ffs_desc_helper helper; 244300a2430fSAndrzej Pietrasiewicz 244400a2430fSAndrzej Pietrasiewicz ENTER(); 244500a2430fSAndrzej Pietrasiewicz 244600a2430fSAndrzej Pietrasiewicz if (get_unaligned_le32(data + 4) != len) 244700a2430fSAndrzej Pietrasiewicz goto error; 244800a2430fSAndrzej Pietrasiewicz 244900a2430fSAndrzej Pietrasiewicz switch (get_unaligned_le32(data)) { 245000a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_DESCRIPTORS_MAGIC: 245100a2430fSAndrzej Pietrasiewicz flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC; 245200a2430fSAndrzej Pietrasiewicz data += 8; 245300a2430fSAndrzej Pietrasiewicz len -= 8; 245400a2430fSAndrzej Pietrasiewicz break; 245500a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_DESCRIPTORS_MAGIC_V2: 245600a2430fSAndrzej Pietrasiewicz flags = get_unaligned_le32(data + 8); 24571b0bf88fSRobert Baldyga ffs->user_flags = flags; 245800a2430fSAndrzej Pietrasiewicz if (flags & ~(FUNCTIONFS_HAS_FS_DESC | 245900a2430fSAndrzej Pietrasiewicz FUNCTIONFS_HAS_HS_DESC | 246000a2430fSAndrzej Pietrasiewicz FUNCTIONFS_HAS_SS_DESC | 24611b0bf88fSRobert Baldyga FUNCTIONFS_HAS_MS_OS_DESC | 24625e33f6fdSRobert Baldyga FUNCTIONFS_VIRTUAL_ADDR | 246354dfce6dSFelix Hädicke FUNCTIONFS_EVENTFD | 24644368c28aSFelix Hädicke FUNCTIONFS_ALL_CTRL_RECIP | 24654368c28aSFelix Hädicke FUNCTIONFS_CONFIG0_SETUP)) { 246600a2430fSAndrzej Pietrasiewicz ret = -ENOSYS; 246700a2430fSAndrzej Pietrasiewicz goto error; 246800a2430fSAndrzej Pietrasiewicz } 246900a2430fSAndrzej Pietrasiewicz data += 12; 247000a2430fSAndrzej Pietrasiewicz len -= 12; 247100a2430fSAndrzej Pietrasiewicz break; 247200a2430fSAndrzej Pietrasiewicz default: 247300a2430fSAndrzej Pietrasiewicz goto error; 247400a2430fSAndrzej Pietrasiewicz } 247500a2430fSAndrzej Pietrasiewicz 24765e33f6fdSRobert Baldyga if (flags & FUNCTIONFS_EVENTFD) { 24775e33f6fdSRobert Baldyga if (len < 4) 24785e33f6fdSRobert Baldyga goto error; 24795e33f6fdSRobert Baldyga ffs->ffs_eventfd = 24805e33f6fdSRobert Baldyga eventfd_ctx_fdget((int)get_unaligned_le32(data)); 24815e33f6fdSRobert Baldyga if (IS_ERR(ffs->ffs_eventfd)) { 24825e33f6fdSRobert Baldyga ret = PTR_ERR(ffs->ffs_eventfd); 24835e33f6fdSRobert Baldyga ffs->ffs_eventfd = NULL; 24845e33f6fdSRobert Baldyga goto error; 24855e33f6fdSRobert Baldyga } 24865e33f6fdSRobert Baldyga data += 4; 24875e33f6fdSRobert Baldyga len -= 4; 24885e33f6fdSRobert Baldyga } 24895e33f6fdSRobert Baldyga 249000a2430fSAndrzej Pietrasiewicz /* Read fs_count, hs_count and ss_count (if present) */ 249100a2430fSAndrzej Pietrasiewicz for (i = 0; i < 3; ++i) { 249200a2430fSAndrzej Pietrasiewicz if (!(flags & (1 << i))) { 249300a2430fSAndrzej Pietrasiewicz counts[i] = 0; 249400a2430fSAndrzej Pietrasiewicz } else if (len < 4) { 249500a2430fSAndrzej Pietrasiewicz goto error; 249600a2430fSAndrzej Pietrasiewicz } else { 249700a2430fSAndrzej Pietrasiewicz counts[i] = get_unaligned_le32(data); 249800a2430fSAndrzej Pietrasiewicz data += 4; 249900a2430fSAndrzej Pietrasiewicz len -= 4; 250000a2430fSAndrzej Pietrasiewicz } 250100a2430fSAndrzej Pietrasiewicz } 250200a2430fSAndrzej Pietrasiewicz if (flags & (1 << i)) { 250383e526f2SVincent Pelletier if (len < 4) { 250483e526f2SVincent Pelletier goto error; 250583e526f2SVincent Pelletier } 250600a2430fSAndrzej Pietrasiewicz os_descs_count = get_unaligned_le32(data); 250700a2430fSAndrzej Pietrasiewicz data += 4; 250800a2430fSAndrzej Pietrasiewicz len -= 4; 250900a2430fSAndrzej Pietrasiewicz }; 251000a2430fSAndrzej Pietrasiewicz 251100a2430fSAndrzej Pietrasiewicz /* Read descriptors */ 251200a2430fSAndrzej Pietrasiewicz raw_descs = data; 25136d5c1c77SRobert Baldyga helper.ffs = ffs; 251400a2430fSAndrzej Pietrasiewicz for (i = 0; i < 3; ++i) { 251500a2430fSAndrzej Pietrasiewicz if (!counts[i]) 251600a2430fSAndrzej Pietrasiewicz continue; 25176d5c1c77SRobert Baldyga helper.interfaces_count = 0; 25186d5c1c77SRobert Baldyga helper.eps_count = 0; 251900a2430fSAndrzej Pietrasiewicz ret = ffs_do_descs(counts[i], data, len, 25206d5c1c77SRobert Baldyga __ffs_data_do_entity, &helper); 252100a2430fSAndrzej Pietrasiewicz if (ret < 0) 252200a2430fSAndrzej Pietrasiewicz goto error; 25236d5c1c77SRobert Baldyga if (!ffs->eps_count && !ffs->interfaces_count) { 25246d5c1c77SRobert Baldyga ffs->eps_count = helper.eps_count; 25256d5c1c77SRobert Baldyga ffs->interfaces_count = helper.interfaces_count; 25266d5c1c77SRobert Baldyga } else { 25276d5c1c77SRobert Baldyga if (ffs->eps_count != helper.eps_count) { 25286d5c1c77SRobert Baldyga ret = -EINVAL; 25296d5c1c77SRobert Baldyga goto error; 25306d5c1c77SRobert Baldyga } 25316d5c1c77SRobert Baldyga if (ffs->interfaces_count != helper.interfaces_count) { 25326d5c1c77SRobert Baldyga ret = -EINVAL; 25336d5c1c77SRobert Baldyga goto error; 25346d5c1c77SRobert Baldyga } 25356d5c1c77SRobert Baldyga } 253600a2430fSAndrzej Pietrasiewicz data += ret; 253700a2430fSAndrzej Pietrasiewicz len -= ret; 253800a2430fSAndrzej Pietrasiewicz } 253900a2430fSAndrzej Pietrasiewicz if (os_descs_count) { 254000a2430fSAndrzej Pietrasiewicz ret = ffs_do_os_descs(os_descs_count, data, len, 254100a2430fSAndrzej Pietrasiewicz __ffs_data_do_os_desc, ffs); 254200a2430fSAndrzej Pietrasiewicz if (ret < 0) 254300a2430fSAndrzej Pietrasiewicz goto error; 254400a2430fSAndrzej Pietrasiewicz data += ret; 254500a2430fSAndrzej Pietrasiewicz len -= ret; 254600a2430fSAndrzej Pietrasiewicz } 254700a2430fSAndrzej Pietrasiewicz 254800a2430fSAndrzej Pietrasiewicz if (raw_descs == data || len) { 254900a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 255000a2430fSAndrzej Pietrasiewicz goto error; 255100a2430fSAndrzej Pietrasiewicz } 255200a2430fSAndrzej Pietrasiewicz 255300a2430fSAndrzej Pietrasiewicz ffs->raw_descs_data = _data; 255400a2430fSAndrzej Pietrasiewicz ffs->raw_descs = raw_descs; 255500a2430fSAndrzej Pietrasiewicz ffs->raw_descs_length = data - raw_descs; 255600a2430fSAndrzej Pietrasiewicz ffs->fs_descs_count = counts[0]; 255700a2430fSAndrzej Pietrasiewicz ffs->hs_descs_count = counts[1]; 255800a2430fSAndrzej Pietrasiewicz ffs->ss_descs_count = counts[2]; 255900a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_count = os_descs_count; 256000a2430fSAndrzej Pietrasiewicz 256100a2430fSAndrzej Pietrasiewicz return 0; 256200a2430fSAndrzej Pietrasiewicz 256300a2430fSAndrzej Pietrasiewicz error: 256400a2430fSAndrzej Pietrasiewicz kfree(_data); 256500a2430fSAndrzej Pietrasiewicz return ret; 256600a2430fSAndrzej Pietrasiewicz } 256700a2430fSAndrzej Pietrasiewicz 256800a2430fSAndrzej Pietrasiewicz static int __ffs_data_got_strings(struct ffs_data *ffs, 256900a2430fSAndrzej Pietrasiewicz char *const _data, size_t len) 257000a2430fSAndrzej Pietrasiewicz { 257100a2430fSAndrzej Pietrasiewicz u32 str_count, needed_count, lang_count; 257200a2430fSAndrzej Pietrasiewicz struct usb_gadget_strings **stringtabs, *t; 257300a2430fSAndrzej Pietrasiewicz const char *data = _data; 2574872ce511SMichal Nazarewicz struct usb_string *s; 257500a2430fSAndrzej Pietrasiewicz 257600a2430fSAndrzej Pietrasiewicz ENTER(); 257700a2430fSAndrzej Pietrasiewicz 257883e526f2SVincent Pelletier if (unlikely(len < 16 || 257983e526f2SVincent Pelletier get_unaligned_le32(data) != FUNCTIONFS_STRINGS_MAGIC || 258000a2430fSAndrzej Pietrasiewicz get_unaligned_le32(data + 4) != len)) 258100a2430fSAndrzej Pietrasiewicz goto error; 258200a2430fSAndrzej Pietrasiewicz str_count = get_unaligned_le32(data + 8); 258300a2430fSAndrzej Pietrasiewicz lang_count = get_unaligned_le32(data + 12); 258400a2430fSAndrzej Pietrasiewicz 258500a2430fSAndrzej Pietrasiewicz /* if one is zero the other must be zero */ 258600a2430fSAndrzej Pietrasiewicz if (unlikely(!str_count != !lang_count)) 258700a2430fSAndrzej Pietrasiewicz goto error; 258800a2430fSAndrzej Pietrasiewicz 258900a2430fSAndrzej Pietrasiewicz /* Do we have at least as many strings as descriptors need? */ 259000a2430fSAndrzej Pietrasiewicz needed_count = ffs->strings_count; 259100a2430fSAndrzej Pietrasiewicz if (unlikely(str_count < needed_count)) 259200a2430fSAndrzej Pietrasiewicz goto error; 259300a2430fSAndrzej Pietrasiewicz 259400a2430fSAndrzej Pietrasiewicz /* 259500a2430fSAndrzej Pietrasiewicz * If we don't need any strings just return and free all 259600a2430fSAndrzej Pietrasiewicz * memory. 259700a2430fSAndrzej Pietrasiewicz */ 259800a2430fSAndrzej Pietrasiewicz if (!needed_count) { 259900a2430fSAndrzej Pietrasiewicz kfree(_data); 260000a2430fSAndrzej Pietrasiewicz return 0; 260100a2430fSAndrzej Pietrasiewicz } 260200a2430fSAndrzej Pietrasiewicz 260300a2430fSAndrzej Pietrasiewicz /* Allocate everything in one chunk so there's less maintenance. */ 260400a2430fSAndrzej Pietrasiewicz { 260500a2430fSAndrzej Pietrasiewicz unsigned i = 0; 260600a2430fSAndrzej Pietrasiewicz vla_group(d); 260700a2430fSAndrzej Pietrasiewicz vla_item(d, struct usb_gadget_strings *, stringtabs, 260800a2430fSAndrzej Pietrasiewicz lang_count + 1); 260900a2430fSAndrzej Pietrasiewicz vla_item(d, struct usb_gadget_strings, stringtab, lang_count); 261000a2430fSAndrzej Pietrasiewicz vla_item(d, struct usb_string, strings, 261100a2430fSAndrzej Pietrasiewicz lang_count*(needed_count+1)); 261200a2430fSAndrzej Pietrasiewicz 261300a2430fSAndrzej Pietrasiewicz char *vlabuf = kmalloc(vla_group_size(d), GFP_KERNEL); 261400a2430fSAndrzej Pietrasiewicz 261500a2430fSAndrzej Pietrasiewicz if (unlikely(!vlabuf)) { 261600a2430fSAndrzej Pietrasiewicz kfree(_data); 261700a2430fSAndrzej Pietrasiewicz return -ENOMEM; 261800a2430fSAndrzej Pietrasiewicz } 261900a2430fSAndrzej Pietrasiewicz 262000a2430fSAndrzej Pietrasiewicz /* Initialize the VLA pointers */ 262100a2430fSAndrzej Pietrasiewicz stringtabs = vla_ptr(vlabuf, d, stringtabs); 262200a2430fSAndrzej Pietrasiewicz t = vla_ptr(vlabuf, d, stringtab); 262300a2430fSAndrzej Pietrasiewicz i = lang_count; 262400a2430fSAndrzej Pietrasiewicz do { 262500a2430fSAndrzej Pietrasiewicz *stringtabs++ = t++; 262600a2430fSAndrzej Pietrasiewicz } while (--i); 262700a2430fSAndrzej Pietrasiewicz *stringtabs = NULL; 262800a2430fSAndrzej Pietrasiewicz 262900a2430fSAndrzej Pietrasiewicz /* stringtabs = vlabuf = d_stringtabs for later kfree */ 263000a2430fSAndrzej Pietrasiewicz stringtabs = vla_ptr(vlabuf, d, stringtabs); 263100a2430fSAndrzej Pietrasiewicz t = vla_ptr(vlabuf, d, stringtab); 263200a2430fSAndrzej Pietrasiewicz s = vla_ptr(vlabuf, d, strings); 263300a2430fSAndrzej Pietrasiewicz } 263400a2430fSAndrzej Pietrasiewicz 263500a2430fSAndrzej Pietrasiewicz /* For each language */ 263600a2430fSAndrzej Pietrasiewicz data += 16; 263700a2430fSAndrzej Pietrasiewicz len -= 16; 263800a2430fSAndrzej Pietrasiewicz 263900a2430fSAndrzej Pietrasiewicz do { /* lang_count > 0 so we can use do-while */ 264000a2430fSAndrzej Pietrasiewicz unsigned needed = needed_count; 264100a2430fSAndrzej Pietrasiewicz 264200a2430fSAndrzej Pietrasiewicz if (unlikely(len < 3)) 264300a2430fSAndrzej Pietrasiewicz goto error_free; 264400a2430fSAndrzej Pietrasiewicz t->language = get_unaligned_le16(data); 264500a2430fSAndrzej Pietrasiewicz t->strings = s; 264600a2430fSAndrzej Pietrasiewicz ++t; 264700a2430fSAndrzej Pietrasiewicz 264800a2430fSAndrzej Pietrasiewicz data += 2; 264900a2430fSAndrzej Pietrasiewicz len -= 2; 265000a2430fSAndrzej Pietrasiewicz 265100a2430fSAndrzej Pietrasiewicz /* For each string */ 265200a2430fSAndrzej Pietrasiewicz do { /* str_count > 0 so we can use do-while */ 265300a2430fSAndrzej Pietrasiewicz size_t length = strnlen(data, len); 265400a2430fSAndrzej Pietrasiewicz 265500a2430fSAndrzej Pietrasiewicz if (unlikely(length == len)) 265600a2430fSAndrzej Pietrasiewicz goto error_free; 265700a2430fSAndrzej Pietrasiewicz 265800a2430fSAndrzej Pietrasiewicz /* 265900a2430fSAndrzej Pietrasiewicz * User may provide more strings then we need, 266000a2430fSAndrzej Pietrasiewicz * if that's the case we simply ignore the 266100a2430fSAndrzej Pietrasiewicz * rest 266200a2430fSAndrzej Pietrasiewicz */ 266300a2430fSAndrzej Pietrasiewicz if (likely(needed)) { 266400a2430fSAndrzej Pietrasiewicz /* 266500a2430fSAndrzej Pietrasiewicz * s->id will be set while adding 266600a2430fSAndrzej Pietrasiewicz * function to configuration so for 266700a2430fSAndrzej Pietrasiewicz * now just leave garbage here. 266800a2430fSAndrzej Pietrasiewicz */ 266900a2430fSAndrzej Pietrasiewicz s->s = data; 267000a2430fSAndrzej Pietrasiewicz --needed; 267100a2430fSAndrzej Pietrasiewicz ++s; 267200a2430fSAndrzej Pietrasiewicz } 267300a2430fSAndrzej Pietrasiewicz 267400a2430fSAndrzej Pietrasiewicz data += length + 1; 267500a2430fSAndrzej Pietrasiewicz len -= length + 1; 267600a2430fSAndrzej Pietrasiewicz } while (--str_count); 267700a2430fSAndrzej Pietrasiewicz 267800a2430fSAndrzej Pietrasiewicz s->id = 0; /* terminator */ 267900a2430fSAndrzej Pietrasiewicz s->s = NULL; 268000a2430fSAndrzej Pietrasiewicz ++s; 268100a2430fSAndrzej Pietrasiewicz 268200a2430fSAndrzej Pietrasiewicz } while (--lang_count); 268300a2430fSAndrzej Pietrasiewicz 268400a2430fSAndrzej Pietrasiewicz /* Some garbage left? */ 268500a2430fSAndrzej Pietrasiewicz if (unlikely(len)) 268600a2430fSAndrzej Pietrasiewicz goto error_free; 268700a2430fSAndrzej Pietrasiewicz 268800a2430fSAndrzej Pietrasiewicz /* Done! */ 268900a2430fSAndrzej Pietrasiewicz ffs->stringtabs = stringtabs; 269000a2430fSAndrzej Pietrasiewicz ffs->raw_strings = _data; 269100a2430fSAndrzej Pietrasiewicz 269200a2430fSAndrzej Pietrasiewicz return 0; 269300a2430fSAndrzej Pietrasiewicz 269400a2430fSAndrzej Pietrasiewicz error_free: 269500a2430fSAndrzej Pietrasiewicz kfree(stringtabs); 269600a2430fSAndrzej Pietrasiewicz error: 269700a2430fSAndrzej Pietrasiewicz kfree(_data); 269800a2430fSAndrzej Pietrasiewicz return -EINVAL; 269900a2430fSAndrzej Pietrasiewicz } 270000a2430fSAndrzej Pietrasiewicz 270100a2430fSAndrzej Pietrasiewicz 270200a2430fSAndrzej Pietrasiewicz /* Events handling and management *******************************************/ 270300a2430fSAndrzej Pietrasiewicz 270400a2430fSAndrzej Pietrasiewicz static void __ffs_event_add(struct ffs_data *ffs, 270500a2430fSAndrzej Pietrasiewicz enum usb_functionfs_event_type type) 270600a2430fSAndrzej Pietrasiewicz { 270700a2430fSAndrzej Pietrasiewicz enum usb_functionfs_event_type rem_type1, rem_type2 = type; 270800a2430fSAndrzej Pietrasiewicz int neg = 0; 270900a2430fSAndrzej Pietrasiewicz 271000a2430fSAndrzej Pietrasiewicz /* 271100a2430fSAndrzej Pietrasiewicz * Abort any unhandled setup 271200a2430fSAndrzej Pietrasiewicz * 271300a2430fSAndrzej Pietrasiewicz * We do not need to worry about some cmpxchg() changing value 271400a2430fSAndrzej Pietrasiewicz * of ffs->setup_state without holding the lock because when 271500a2430fSAndrzej Pietrasiewicz * state is FFS_SETUP_PENDING cmpxchg() in several places in 271600a2430fSAndrzej Pietrasiewicz * the source does nothing. 271700a2430fSAndrzej Pietrasiewicz */ 271800a2430fSAndrzej Pietrasiewicz if (ffs->setup_state == FFS_SETUP_PENDING) 271900a2430fSAndrzej Pietrasiewicz ffs->setup_state = FFS_SETUP_CANCELLED; 272000a2430fSAndrzej Pietrasiewicz 272167913bbdSMichal Nazarewicz /* 272267913bbdSMichal Nazarewicz * Logic of this function guarantees that there are at most four pending 272367913bbdSMichal Nazarewicz * evens on ffs->ev.types queue. This is important because the queue 272467913bbdSMichal Nazarewicz * has space for four elements only and __ffs_ep0_read_events function 272567913bbdSMichal Nazarewicz * depends on that limit as well. If more event types are added, those 272667913bbdSMichal Nazarewicz * limits have to be revisited or guaranteed to still hold. 272767913bbdSMichal Nazarewicz */ 272800a2430fSAndrzej Pietrasiewicz switch (type) { 272900a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_RESUME: 273000a2430fSAndrzej Pietrasiewicz rem_type2 = FUNCTIONFS_SUSPEND; 273100a2430fSAndrzej Pietrasiewicz /* FALL THROUGH */ 273200a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_SUSPEND: 273300a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_SETUP: 273400a2430fSAndrzej Pietrasiewicz rem_type1 = type; 273500a2430fSAndrzej Pietrasiewicz /* Discard all similar events */ 273600a2430fSAndrzej Pietrasiewicz break; 273700a2430fSAndrzej Pietrasiewicz 273800a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_BIND: 273900a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_UNBIND: 274000a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_DISABLE: 274100a2430fSAndrzej Pietrasiewicz case FUNCTIONFS_ENABLE: 274200a2430fSAndrzej Pietrasiewicz /* Discard everything other then power management. */ 274300a2430fSAndrzej Pietrasiewicz rem_type1 = FUNCTIONFS_SUSPEND; 274400a2430fSAndrzej Pietrasiewicz rem_type2 = FUNCTIONFS_RESUME; 274500a2430fSAndrzej Pietrasiewicz neg = 1; 274600a2430fSAndrzej Pietrasiewicz break; 274700a2430fSAndrzej Pietrasiewicz 274800a2430fSAndrzej Pietrasiewicz default: 2749fe00bcbfSMichal Nazarewicz WARN(1, "%d: unknown event, this should not happen\n", type); 2750fe00bcbfSMichal Nazarewicz return; 275100a2430fSAndrzej Pietrasiewicz } 275200a2430fSAndrzej Pietrasiewicz 275300a2430fSAndrzej Pietrasiewicz { 275400a2430fSAndrzej Pietrasiewicz u8 *ev = ffs->ev.types, *out = ev; 275500a2430fSAndrzej Pietrasiewicz unsigned n = ffs->ev.count; 275600a2430fSAndrzej Pietrasiewicz for (; n; --n, ++ev) 275700a2430fSAndrzej Pietrasiewicz if ((*ev == rem_type1 || *ev == rem_type2) == neg) 275800a2430fSAndrzej Pietrasiewicz *out++ = *ev; 275900a2430fSAndrzej Pietrasiewicz else 276000a2430fSAndrzej Pietrasiewicz pr_vdebug("purging event %d\n", *ev); 276100a2430fSAndrzej Pietrasiewicz ffs->ev.count = out - ffs->ev.types; 276200a2430fSAndrzej Pietrasiewicz } 276300a2430fSAndrzej Pietrasiewicz 276400a2430fSAndrzej Pietrasiewicz pr_vdebug("adding event %d\n", type); 276500a2430fSAndrzej Pietrasiewicz ffs->ev.types[ffs->ev.count++] = type; 276600a2430fSAndrzej Pietrasiewicz wake_up_locked(&ffs->ev.waitq); 27675e33f6fdSRobert Baldyga if (ffs->ffs_eventfd) 27685e33f6fdSRobert Baldyga eventfd_signal(ffs->ffs_eventfd, 1); 276900a2430fSAndrzej Pietrasiewicz } 277000a2430fSAndrzej Pietrasiewicz 277100a2430fSAndrzej Pietrasiewicz static void ffs_event_add(struct ffs_data *ffs, 277200a2430fSAndrzej Pietrasiewicz enum usb_functionfs_event_type type) 277300a2430fSAndrzej Pietrasiewicz { 277400a2430fSAndrzej Pietrasiewicz unsigned long flags; 277500a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&ffs->ev.waitq.lock, flags); 277600a2430fSAndrzej Pietrasiewicz __ffs_event_add(ffs, type); 277700a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); 277800a2430fSAndrzej Pietrasiewicz } 277900a2430fSAndrzej Pietrasiewicz 278000a2430fSAndrzej Pietrasiewicz /* Bind/unbind USB function hooks *******************************************/ 278100a2430fSAndrzej Pietrasiewicz 27826d5c1c77SRobert Baldyga static int ffs_ep_addr2idx(struct ffs_data *ffs, u8 endpoint_address) 27836d5c1c77SRobert Baldyga { 27846d5c1c77SRobert Baldyga int i; 27856d5c1c77SRobert Baldyga 27866d5c1c77SRobert Baldyga for (i = 1; i < ARRAY_SIZE(ffs->eps_addrmap); ++i) 27876d5c1c77SRobert Baldyga if (ffs->eps_addrmap[i] == endpoint_address) 27886d5c1c77SRobert Baldyga return i; 27896d5c1c77SRobert Baldyga return -ENOENT; 27906d5c1c77SRobert Baldyga } 27916d5c1c77SRobert Baldyga 279200a2430fSAndrzej Pietrasiewicz static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep, 279300a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *desc, 279400a2430fSAndrzej Pietrasiewicz void *priv) 279500a2430fSAndrzej Pietrasiewicz { 279600a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor *ds = (void *)desc; 279700a2430fSAndrzej Pietrasiewicz struct ffs_function *func = priv; 279800a2430fSAndrzej Pietrasiewicz struct ffs_ep *ffs_ep; 279985b06f5eSDan Carpenter unsigned ep_desc_id; 280085b06f5eSDan Carpenter int idx; 280100a2430fSAndrzej Pietrasiewicz static const char *speed_names[] = { "full", "high", "super" }; 280200a2430fSAndrzej Pietrasiewicz 280300a2430fSAndrzej Pietrasiewicz if (type != FFS_DESCRIPTOR) 280400a2430fSAndrzej Pietrasiewicz return 0; 280500a2430fSAndrzej Pietrasiewicz 280600a2430fSAndrzej Pietrasiewicz /* 280700a2430fSAndrzej Pietrasiewicz * If ss_descriptors is not NULL, we are reading super speed 280800a2430fSAndrzej Pietrasiewicz * descriptors; if hs_descriptors is not NULL, we are reading high 280900a2430fSAndrzej Pietrasiewicz * speed descriptors; otherwise, we are reading full speed 281000a2430fSAndrzej Pietrasiewicz * descriptors. 281100a2430fSAndrzej Pietrasiewicz */ 281200a2430fSAndrzej Pietrasiewicz if (func->function.ss_descriptors) { 281300a2430fSAndrzej Pietrasiewicz ep_desc_id = 2; 281400a2430fSAndrzej Pietrasiewicz func->function.ss_descriptors[(long)valuep] = desc; 281500a2430fSAndrzej Pietrasiewicz } else if (func->function.hs_descriptors) { 281600a2430fSAndrzej Pietrasiewicz ep_desc_id = 1; 281700a2430fSAndrzej Pietrasiewicz func->function.hs_descriptors[(long)valuep] = desc; 281800a2430fSAndrzej Pietrasiewicz } else { 281900a2430fSAndrzej Pietrasiewicz ep_desc_id = 0; 282000a2430fSAndrzej Pietrasiewicz func->function.fs_descriptors[(long)valuep] = desc; 282100a2430fSAndrzej Pietrasiewicz } 282200a2430fSAndrzej Pietrasiewicz 282300a2430fSAndrzej Pietrasiewicz if (!desc || desc->bDescriptorType != USB_DT_ENDPOINT) 282400a2430fSAndrzej Pietrasiewicz return 0; 282500a2430fSAndrzej Pietrasiewicz 28266d5c1c77SRobert Baldyga idx = ffs_ep_addr2idx(func->ffs, ds->bEndpointAddress) - 1; 28276d5c1c77SRobert Baldyga if (idx < 0) 28286d5c1c77SRobert Baldyga return idx; 28296d5c1c77SRobert Baldyga 283000a2430fSAndrzej Pietrasiewicz ffs_ep = func->eps + idx; 283100a2430fSAndrzej Pietrasiewicz 283200a2430fSAndrzej Pietrasiewicz if (unlikely(ffs_ep->descs[ep_desc_id])) { 283300a2430fSAndrzej Pietrasiewicz pr_err("two %sspeed descriptors for EP %d\n", 283400a2430fSAndrzej Pietrasiewicz speed_names[ep_desc_id], 283500a2430fSAndrzej Pietrasiewicz ds->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 283600a2430fSAndrzej Pietrasiewicz return -EINVAL; 283700a2430fSAndrzej Pietrasiewicz } 283800a2430fSAndrzej Pietrasiewicz ffs_ep->descs[ep_desc_id] = ds; 283900a2430fSAndrzej Pietrasiewicz 284000a2430fSAndrzej Pietrasiewicz ffs_dump_mem(": Original ep desc", ds, ds->bLength); 284100a2430fSAndrzej Pietrasiewicz if (ffs_ep->ep) { 284200a2430fSAndrzej Pietrasiewicz ds->bEndpointAddress = ffs_ep->descs[0]->bEndpointAddress; 284300a2430fSAndrzej Pietrasiewicz if (!ds->wMaxPacketSize) 284400a2430fSAndrzej Pietrasiewicz ds->wMaxPacketSize = ffs_ep->descs[0]->wMaxPacketSize; 284500a2430fSAndrzej Pietrasiewicz } else { 284600a2430fSAndrzej Pietrasiewicz struct usb_request *req; 284700a2430fSAndrzej Pietrasiewicz struct usb_ep *ep; 28481b0bf88fSRobert Baldyga u8 bEndpointAddress; 2849bdcc03ceSAndrzej Pietrasiewicz u16 wMaxPacketSize; 285000a2430fSAndrzej Pietrasiewicz 28511b0bf88fSRobert Baldyga /* 28521b0bf88fSRobert Baldyga * We back up bEndpointAddress because autoconfig overwrites 28531b0bf88fSRobert Baldyga * it with physical endpoint address. 28541b0bf88fSRobert Baldyga */ 28551b0bf88fSRobert Baldyga bEndpointAddress = ds->bEndpointAddress; 2856bdcc03ceSAndrzej Pietrasiewicz /* 2857bdcc03ceSAndrzej Pietrasiewicz * We back up wMaxPacketSize because autoconfig treats 2858bdcc03ceSAndrzej Pietrasiewicz * endpoint descriptors as if they were full speed. 2859bdcc03ceSAndrzej Pietrasiewicz */ 2860bdcc03ceSAndrzej Pietrasiewicz wMaxPacketSize = ds->wMaxPacketSize; 286100a2430fSAndrzej Pietrasiewicz pr_vdebug("autoconfig\n"); 286200a2430fSAndrzej Pietrasiewicz ep = usb_ep_autoconfig(func->gadget, ds); 286300a2430fSAndrzej Pietrasiewicz if (unlikely(!ep)) 286400a2430fSAndrzej Pietrasiewicz return -ENOTSUPP; 286500a2430fSAndrzej Pietrasiewicz ep->driver_data = func->eps + idx; 286600a2430fSAndrzej Pietrasiewicz 286700a2430fSAndrzej Pietrasiewicz req = usb_ep_alloc_request(ep, GFP_KERNEL); 286800a2430fSAndrzej Pietrasiewicz if (unlikely(!req)) 286900a2430fSAndrzej Pietrasiewicz return -ENOMEM; 287000a2430fSAndrzej Pietrasiewicz 287100a2430fSAndrzej Pietrasiewicz ffs_ep->ep = ep; 287200a2430fSAndrzej Pietrasiewicz ffs_ep->req = req; 287300a2430fSAndrzej Pietrasiewicz func->eps_revmap[ds->bEndpointAddress & 287400a2430fSAndrzej Pietrasiewicz USB_ENDPOINT_NUMBER_MASK] = idx + 1; 28751b0bf88fSRobert Baldyga /* 28761b0bf88fSRobert Baldyga * If we use virtual address mapping, we restore 28771b0bf88fSRobert Baldyga * original bEndpointAddress value. 28781b0bf88fSRobert Baldyga */ 28791b0bf88fSRobert Baldyga if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) 28801b0bf88fSRobert Baldyga ds->bEndpointAddress = bEndpointAddress; 2881bdcc03ceSAndrzej Pietrasiewicz /* 2882bdcc03ceSAndrzej Pietrasiewicz * Restore wMaxPacketSize which was potentially 2883bdcc03ceSAndrzej Pietrasiewicz * overwritten by autoconfig. 2884bdcc03ceSAndrzej Pietrasiewicz */ 2885bdcc03ceSAndrzej Pietrasiewicz ds->wMaxPacketSize = wMaxPacketSize; 288600a2430fSAndrzej Pietrasiewicz } 288700a2430fSAndrzej Pietrasiewicz ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength); 288800a2430fSAndrzej Pietrasiewicz 288900a2430fSAndrzej Pietrasiewicz return 0; 289000a2430fSAndrzej Pietrasiewicz } 289100a2430fSAndrzej Pietrasiewicz 289200a2430fSAndrzej Pietrasiewicz static int __ffs_func_bind_do_nums(enum ffs_entity_type type, u8 *valuep, 289300a2430fSAndrzej Pietrasiewicz struct usb_descriptor_header *desc, 289400a2430fSAndrzej Pietrasiewicz void *priv) 289500a2430fSAndrzej Pietrasiewicz { 289600a2430fSAndrzej Pietrasiewicz struct ffs_function *func = priv; 289700a2430fSAndrzej Pietrasiewicz unsigned idx; 289800a2430fSAndrzej Pietrasiewicz u8 newValue; 289900a2430fSAndrzej Pietrasiewicz 290000a2430fSAndrzej Pietrasiewicz switch (type) { 290100a2430fSAndrzej Pietrasiewicz default: 290200a2430fSAndrzej Pietrasiewicz case FFS_DESCRIPTOR: 290300a2430fSAndrzej Pietrasiewicz /* Handled in previous pass by __ffs_func_bind_do_descs() */ 290400a2430fSAndrzej Pietrasiewicz return 0; 290500a2430fSAndrzej Pietrasiewicz 290600a2430fSAndrzej Pietrasiewicz case FFS_INTERFACE: 290700a2430fSAndrzej Pietrasiewicz idx = *valuep; 290800a2430fSAndrzej Pietrasiewicz if (func->interfaces_nums[idx] < 0) { 290900a2430fSAndrzej Pietrasiewicz int id = usb_interface_id(func->conf, &func->function); 291000a2430fSAndrzej Pietrasiewicz if (unlikely(id < 0)) 291100a2430fSAndrzej Pietrasiewicz return id; 291200a2430fSAndrzej Pietrasiewicz func->interfaces_nums[idx] = id; 291300a2430fSAndrzej Pietrasiewicz } 291400a2430fSAndrzej Pietrasiewicz newValue = func->interfaces_nums[idx]; 291500a2430fSAndrzej Pietrasiewicz break; 291600a2430fSAndrzej Pietrasiewicz 291700a2430fSAndrzej Pietrasiewicz case FFS_STRING: 291800a2430fSAndrzej Pietrasiewicz /* String' IDs are allocated when fsf_data is bound to cdev */ 291900a2430fSAndrzej Pietrasiewicz newValue = func->ffs->stringtabs[0]->strings[*valuep - 1].id; 292000a2430fSAndrzej Pietrasiewicz break; 292100a2430fSAndrzej Pietrasiewicz 292200a2430fSAndrzej Pietrasiewicz case FFS_ENDPOINT: 292300a2430fSAndrzej Pietrasiewicz /* 292400a2430fSAndrzej Pietrasiewicz * USB_DT_ENDPOINT are handled in 292500a2430fSAndrzej Pietrasiewicz * __ffs_func_bind_do_descs(). 292600a2430fSAndrzej Pietrasiewicz */ 292700a2430fSAndrzej Pietrasiewicz if (desc->bDescriptorType == USB_DT_ENDPOINT) 292800a2430fSAndrzej Pietrasiewicz return 0; 292900a2430fSAndrzej Pietrasiewicz 293000a2430fSAndrzej Pietrasiewicz idx = (*valuep & USB_ENDPOINT_NUMBER_MASK) - 1; 293100a2430fSAndrzej Pietrasiewicz if (unlikely(!func->eps[idx].ep)) 293200a2430fSAndrzej Pietrasiewicz return -EINVAL; 293300a2430fSAndrzej Pietrasiewicz 293400a2430fSAndrzej Pietrasiewicz { 293500a2430fSAndrzej Pietrasiewicz struct usb_endpoint_descriptor **descs; 293600a2430fSAndrzej Pietrasiewicz descs = func->eps[idx].descs; 293700a2430fSAndrzej Pietrasiewicz newValue = descs[descs[0] ? 0 : 1]->bEndpointAddress; 293800a2430fSAndrzej Pietrasiewicz } 293900a2430fSAndrzej Pietrasiewicz break; 294000a2430fSAndrzej Pietrasiewicz } 294100a2430fSAndrzej Pietrasiewicz 294200a2430fSAndrzej Pietrasiewicz pr_vdebug("%02x -> %02x\n", *valuep, newValue); 294300a2430fSAndrzej Pietrasiewicz *valuep = newValue; 294400a2430fSAndrzej Pietrasiewicz return 0; 294500a2430fSAndrzej Pietrasiewicz } 294600a2430fSAndrzej Pietrasiewicz 294700a2430fSAndrzej Pietrasiewicz static int __ffs_func_bind_do_os_desc(enum ffs_os_desc_type type, 294800a2430fSAndrzej Pietrasiewicz struct usb_os_desc_header *h, void *data, 294900a2430fSAndrzej Pietrasiewicz unsigned len, void *priv) 295000a2430fSAndrzej Pietrasiewicz { 295100a2430fSAndrzej Pietrasiewicz struct ffs_function *func = priv; 295200a2430fSAndrzej Pietrasiewicz u8 length = 0; 295300a2430fSAndrzej Pietrasiewicz 295400a2430fSAndrzej Pietrasiewicz switch (type) { 295500a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_COMPAT: { 295600a2430fSAndrzej Pietrasiewicz struct usb_ext_compat_desc *desc = data; 295700a2430fSAndrzej Pietrasiewicz struct usb_os_desc_table *t; 295800a2430fSAndrzej Pietrasiewicz 295900a2430fSAndrzej Pietrasiewicz t = &func->function.os_desc_table[desc->bFirstInterfaceNumber]; 296000a2430fSAndrzej Pietrasiewicz t->if_id = func->interfaces_nums[desc->bFirstInterfaceNumber]; 296100a2430fSAndrzej Pietrasiewicz memcpy(t->os_desc->ext_compat_id, &desc->CompatibleID, 296200a2430fSAndrzej Pietrasiewicz ARRAY_SIZE(desc->CompatibleID) + 296300a2430fSAndrzej Pietrasiewicz ARRAY_SIZE(desc->SubCompatibleID)); 296400a2430fSAndrzej Pietrasiewicz length = sizeof(*desc); 296500a2430fSAndrzej Pietrasiewicz } 296600a2430fSAndrzej Pietrasiewicz break; 296700a2430fSAndrzej Pietrasiewicz case FFS_OS_DESC_EXT_PROP: { 296800a2430fSAndrzej Pietrasiewicz struct usb_ext_prop_desc *desc = data; 296900a2430fSAndrzej Pietrasiewicz struct usb_os_desc_table *t; 297000a2430fSAndrzej Pietrasiewicz struct usb_os_desc_ext_prop *ext_prop; 297100a2430fSAndrzej Pietrasiewicz char *ext_prop_name; 297200a2430fSAndrzej Pietrasiewicz char *ext_prop_data; 297300a2430fSAndrzej Pietrasiewicz 297400a2430fSAndrzej Pietrasiewicz t = &func->function.os_desc_table[h->interface]; 297500a2430fSAndrzej Pietrasiewicz t->if_id = func->interfaces_nums[h->interface]; 297600a2430fSAndrzej Pietrasiewicz 297700a2430fSAndrzej Pietrasiewicz ext_prop = func->ffs->ms_os_descs_ext_prop_avail; 297800a2430fSAndrzej Pietrasiewicz func->ffs->ms_os_descs_ext_prop_avail += sizeof(*ext_prop); 297900a2430fSAndrzej Pietrasiewicz 298000a2430fSAndrzej Pietrasiewicz ext_prop->type = le32_to_cpu(desc->dwPropertyDataType); 298100a2430fSAndrzej Pietrasiewicz ext_prop->name_len = le16_to_cpu(desc->wPropertyNameLength); 2982c40619bbSVincent Pelletier ext_prop->data_len = le32_to_cpu(*(__le32 *) 298300a2430fSAndrzej Pietrasiewicz usb_ext_prop_data_len_ptr(data, ext_prop->name_len)); 298400a2430fSAndrzej Pietrasiewicz length = ext_prop->name_len + ext_prop->data_len + 14; 298500a2430fSAndrzej Pietrasiewicz 298600a2430fSAndrzej Pietrasiewicz ext_prop_name = func->ffs->ms_os_descs_ext_prop_name_avail; 298700a2430fSAndrzej Pietrasiewicz func->ffs->ms_os_descs_ext_prop_name_avail += 298800a2430fSAndrzej Pietrasiewicz ext_prop->name_len; 298900a2430fSAndrzej Pietrasiewicz 299000a2430fSAndrzej Pietrasiewicz ext_prop_data = func->ffs->ms_os_descs_ext_prop_data_avail; 299100a2430fSAndrzej Pietrasiewicz func->ffs->ms_os_descs_ext_prop_data_avail += 299200a2430fSAndrzej Pietrasiewicz ext_prop->data_len; 299300a2430fSAndrzej Pietrasiewicz memcpy(ext_prop_data, 299400a2430fSAndrzej Pietrasiewicz usb_ext_prop_data_ptr(data, ext_prop->name_len), 299500a2430fSAndrzej Pietrasiewicz ext_prop->data_len); 299600a2430fSAndrzej Pietrasiewicz /* unicode data reported to the host as "WCHAR"s */ 299700a2430fSAndrzej Pietrasiewicz switch (ext_prop->type) { 299800a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE: 299900a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE_ENV: 300000a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE_LINK: 300100a2430fSAndrzej Pietrasiewicz case USB_EXT_PROP_UNICODE_MULTI: 300200a2430fSAndrzej Pietrasiewicz ext_prop->data_len *= 2; 300300a2430fSAndrzej Pietrasiewicz break; 300400a2430fSAndrzej Pietrasiewicz } 300500a2430fSAndrzej Pietrasiewicz ext_prop->data = ext_prop_data; 300600a2430fSAndrzej Pietrasiewicz 300700a2430fSAndrzej Pietrasiewicz memcpy(ext_prop_name, usb_ext_prop_name_ptr(data), 300800a2430fSAndrzej Pietrasiewicz ext_prop->name_len); 300900a2430fSAndrzej Pietrasiewicz /* property name reported to the host as "WCHAR"s */ 301000a2430fSAndrzej Pietrasiewicz ext_prop->name_len *= 2; 301100a2430fSAndrzej Pietrasiewicz ext_prop->name = ext_prop_name; 301200a2430fSAndrzej Pietrasiewicz 301300a2430fSAndrzej Pietrasiewicz t->os_desc->ext_prop_len += 301400a2430fSAndrzej Pietrasiewicz ext_prop->name_len + ext_prop->data_len + 14; 301500a2430fSAndrzej Pietrasiewicz ++t->os_desc->ext_prop_count; 301600a2430fSAndrzej Pietrasiewicz list_add_tail(&ext_prop->entry, &t->os_desc->ext_prop); 301700a2430fSAndrzej Pietrasiewicz } 301800a2430fSAndrzej Pietrasiewicz break; 301900a2430fSAndrzej Pietrasiewicz default: 302000a2430fSAndrzej Pietrasiewicz pr_vdebug("unknown descriptor: %d\n", type); 302100a2430fSAndrzej Pietrasiewicz } 302200a2430fSAndrzej Pietrasiewicz 302300a2430fSAndrzej Pietrasiewicz return length; 302400a2430fSAndrzej Pietrasiewicz } 302500a2430fSAndrzej Pietrasiewicz 302600a2430fSAndrzej Pietrasiewicz static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f, 302700a2430fSAndrzej Pietrasiewicz struct usb_configuration *c) 302800a2430fSAndrzej Pietrasiewicz { 302900a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 303000a2430fSAndrzej Pietrasiewicz struct f_fs_opts *ffs_opts = 303100a2430fSAndrzej Pietrasiewicz container_of(f->fi, struct f_fs_opts, func_inst); 303200a2430fSAndrzej Pietrasiewicz int ret; 303300a2430fSAndrzej Pietrasiewicz 303400a2430fSAndrzej Pietrasiewicz ENTER(); 303500a2430fSAndrzej Pietrasiewicz 303600a2430fSAndrzej Pietrasiewicz /* 303700a2430fSAndrzej Pietrasiewicz * Legacy gadget triggers binding in functionfs_ready_callback, 303800a2430fSAndrzej Pietrasiewicz * which already uses locking; taking the same lock here would 303900a2430fSAndrzej Pietrasiewicz * cause a deadlock. 304000a2430fSAndrzej Pietrasiewicz * 304100a2430fSAndrzej Pietrasiewicz * Configfs-enabled gadgets however do need ffs_dev_lock. 304200a2430fSAndrzej Pietrasiewicz */ 304300a2430fSAndrzej Pietrasiewicz if (!ffs_opts->no_configfs) 304400a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 304500a2430fSAndrzej Pietrasiewicz ret = ffs_opts->dev->desc_ready ? 0 : -ENODEV; 304600a2430fSAndrzej Pietrasiewicz func->ffs = ffs_opts->dev->ffs_data; 304700a2430fSAndrzej Pietrasiewicz if (!ffs_opts->no_configfs) 304800a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 304900a2430fSAndrzej Pietrasiewicz if (ret) 305000a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 305100a2430fSAndrzej Pietrasiewicz 305200a2430fSAndrzej Pietrasiewicz func->conf = c; 305300a2430fSAndrzej Pietrasiewicz func->gadget = c->cdev->gadget; 305400a2430fSAndrzej Pietrasiewicz 305500a2430fSAndrzej Pietrasiewicz /* 305600a2430fSAndrzej Pietrasiewicz * in drivers/usb/gadget/configfs.c:configfs_composite_bind() 305700a2430fSAndrzej Pietrasiewicz * configurations are bound in sequence with list_for_each_entry, 305800a2430fSAndrzej Pietrasiewicz * in each configuration its functions are bound in sequence 305900a2430fSAndrzej Pietrasiewicz * with list_for_each_entry, so we assume no race condition 306000a2430fSAndrzej Pietrasiewicz * with regard to ffs_opts->bound access 306100a2430fSAndrzej Pietrasiewicz */ 306200a2430fSAndrzej Pietrasiewicz if (!ffs_opts->refcnt) { 306300a2430fSAndrzej Pietrasiewicz ret = functionfs_bind(func->ffs, c->cdev); 306400a2430fSAndrzej Pietrasiewicz if (ret) 306500a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 306600a2430fSAndrzej Pietrasiewicz } 306700a2430fSAndrzej Pietrasiewicz ffs_opts->refcnt++; 306800a2430fSAndrzej Pietrasiewicz func->function.strings = func->ffs->stringtabs; 306900a2430fSAndrzej Pietrasiewicz 307000a2430fSAndrzej Pietrasiewicz return ffs_opts; 307100a2430fSAndrzej Pietrasiewicz } 307200a2430fSAndrzej Pietrasiewicz 307300a2430fSAndrzej Pietrasiewicz static int _ffs_func_bind(struct usb_configuration *c, 307400a2430fSAndrzej Pietrasiewicz struct usb_function *f) 307500a2430fSAndrzej Pietrasiewicz { 307600a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 307700a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 307800a2430fSAndrzej Pietrasiewicz 307900a2430fSAndrzej Pietrasiewicz const int full = !!func->ffs->fs_descs_count; 30806cf439e0SJack Pham const int high = !!func->ffs->hs_descs_count; 30816cf439e0SJack Pham const int super = !!func->ffs->ss_descs_count; 308200a2430fSAndrzej Pietrasiewicz 308300a2430fSAndrzej Pietrasiewicz int fs_len, hs_len, ss_len, ret, i; 30840015f915SDan Carpenter struct ffs_ep *eps_ptr; 308500a2430fSAndrzej Pietrasiewicz 308600a2430fSAndrzej Pietrasiewicz /* Make it a single chunk, less management later on */ 308700a2430fSAndrzej Pietrasiewicz vla_group(d); 308800a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct ffs_ep, eps, ffs->eps_count); 308900a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_descriptor_header *, fs_descs, 309000a2430fSAndrzej Pietrasiewicz full ? ffs->fs_descs_count + 1 : 0); 309100a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_descriptor_header *, hs_descs, 309200a2430fSAndrzej Pietrasiewicz high ? ffs->hs_descs_count + 1 : 0); 309300a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs, 309400a2430fSAndrzej Pietrasiewicz super ? ffs->ss_descs_count + 1 : 0); 309500a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, short, inums, ffs->interfaces_count); 309600a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_os_desc_table, os_desc_table, 309700a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0); 309800a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char[16], ext_compat, 309900a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0); 310000a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_os_desc, os_desc, 310100a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0); 310200a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, struct usb_os_desc_ext_prop, ext_prop, 310300a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_count); 310400a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char, ext_prop_name, 310500a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_name_len); 310600a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char, ext_prop_data, 310700a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_data_len); 310800a2430fSAndrzej Pietrasiewicz vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length); 310900a2430fSAndrzej Pietrasiewicz char *vlabuf; 311000a2430fSAndrzej Pietrasiewicz 311100a2430fSAndrzej Pietrasiewicz ENTER(); 311200a2430fSAndrzej Pietrasiewicz 311300a2430fSAndrzej Pietrasiewicz /* Has descriptors only for speeds gadget does not support */ 311400a2430fSAndrzej Pietrasiewicz if (unlikely(!(full | high | super))) 311500a2430fSAndrzej Pietrasiewicz return -ENOTSUPP; 311600a2430fSAndrzej Pietrasiewicz 311700a2430fSAndrzej Pietrasiewicz /* Allocate a single chunk, less management later on */ 311800a2430fSAndrzej Pietrasiewicz vlabuf = kzalloc(vla_group_size(d), GFP_KERNEL); 311900a2430fSAndrzej Pietrasiewicz if (unlikely(!vlabuf)) 312000a2430fSAndrzej Pietrasiewicz return -ENOMEM; 312100a2430fSAndrzej Pietrasiewicz 312200a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_avail = vla_ptr(vlabuf, d, ext_prop); 312300a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_name_avail = 312400a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, ext_prop_name); 312500a2430fSAndrzej Pietrasiewicz ffs->ms_os_descs_ext_prop_data_avail = 312600a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, ext_prop_data); 312700a2430fSAndrzej Pietrasiewicz 312800a2430fSAndrzej Pietrasiewicz /* Copy descriptors */ 312900a2430fSAndrzej Pietrasiewicz memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs, 313000a2430fSAndrzej Pietrasiewicz ffs->raw_descs_length); 313100a2430fSAndrzej Pietrasiewicz 313200a2430fSAndrzej Pietrasiewicz memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz); 31330015f915SDan Carpenter eps_ptr = vla_ptr(vlabuf, d, eps); 31340015f915SDan Carpenter for (i = 0; i < ffs->eps_count; i++) 31350015f915SDan Carpenter eps_ptr[i].num = -1; 313600a2430fSAndrzej Pietrasiewicz 313700a2430fSAndrzej Pietrasiewicz /* Save pointers 313800a2430fSAndrzej Pietrasiewicz * d_eps == vlabuf, func->eps used to kfree vlabuf later 313900a2430fSAndrzej Pietrasiewicz */ 314000a2430fSAndrzej Pietrasiewicz func->eps = vla_ptr(vlabuf, d, eps); 314100a2430fSAndrzej Pietrasiewicz func->interfaces_nums = vla_ptr(vlabuf, d, inums); 314200a2430fSAndrzej Pietrasiewicz 314300a2430fSAndrzej Pietrasiewicz /* 314400a2430fSAndrzej Pietrasiewicz * Go through all the endpoint descriptors and allocate 314500a2430fSAndrzej Pietrasiewicz * endpoints first, so that later we can rewrite the endpoint 314600a2430fSAndrzej Pietrasiewicz * numbers without worrying that it may be described later on. 314700a2430fSAndrzej Pietrasiewicz */ 314800a2430fSAndrzej Pietrasiewicz if (likely(full)) { 314900a2430fSAndrzej Pietrasiewicz func->function.fs_descriptors = vla_ptr(vlabuf, d, fs_descs); 315000a2430fSAndrzej Pietrasiewicz fs_len = ffs_do_descs(ffs->fs_descs_count, 315100a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs), 315200a2430fSAndrzej Pietrasiewicz d_raw_descs__sz, 315300a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_descs, func); 315400a2430fSAndrzej Pietrasiewicz if (unlikely(fs_len < 0)) { 315500a2430fSAndrzej Pietrasiewicz ret = fs_len; 315600a2430fSAndrzej Pietrasiewicz goto error; 315700a2430fSAndrzej Pietrasiewicz } 315800a2430fSAndrzej Pietrasiewicz } else { 315900a2430fSAndrzej Pietrasiewicz fs_len = 0; 316000a2430fSAndrzej Pietrasiewicz } 316100a2430fSAndrzej Pietrasiewicz 316200a2430fSAndrzej Pietrasiewicz if (likely(high)) { 316300a2430fSAndrzej Pietrasiewicz func->function.hs_descriptors = vla_ptr(vlabuf, d, hs_descs); 316400a2430fSAndrzej Pietrasiewicz hs_len = ffs_do_descs(ffs->hs_descs_count, 316500a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs) + fs_len, 316600a2430fSAndrzej Pietrasiewicz d_raw_descs__sz - fs_len, 316700a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_descs, func); 316800a2430fSAndrzej Pietrasiewicz if (unlikely(hs_len < 0)) { 316900a2430fSAndrzej Pietrasiewicz ret = hs_len; 317000a2430fSAndrzej Pietrasiewicz goto error; 317100a2430fSAndrzej Pietrasiewicz } 317200a2430fSAndrzej Pietrasiewicz } else { 317300a2430fSAndrzej Pietrasiewicz hs_len = 0; 317400a2430fSAndrzej Pietrasiewicz } 317500a2430fSAndrzej Pietrasiewicz 317600a2430fSAndrzej Pietrasiewicz if (likely(super)) { 317700a2430fSAndrzej Pietrasiewicz func->function.ss_descriptors = vla_ptr(vlabuf, d, ss_descs); 317800a2430fSAndrzej Pietrasiewicz ss_len = ffs_do_descs(ffs->ss_descs_count, 317900a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs) + fs_len + hs_len, 318000a2430fSAndrzej Pietrasiewicz d_raw_descs__sz - fs_len - hs_len, 318100a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_descs, func); 318200a2430fSAndrzej Pietrasiewicz if (unlikely(ss_len < 0)) { 318300a2430fSAndrzej Pietrasiewicz ret = ss_len; 318400a2430fSAndrzej Pietrasiewicz goto error; 318500a2430fSAndrzej Pietrasiewicz } 318600a2430fSAndrzej Pietrasiewicz } else { 318700a2430fSAndrzej Pietrasiewicz ss_len = 0; 318800a2430fSAndrzej Pietrasiewicz } 318900a2430fSAndrzej Pietrasiewicz 319000a2430fSAndrzej Pietrasiewicz /* 319100a2430fSAndrzej Pietrasiewicz * Now handle interface numbers allocation and interface and 319200a2430fSAndrzej Pietrasiewicz * endpoint numbers rewriting. We can do that in one go 319300a2430fSAndrzej Pietrasiewicz * now. 319400a2430fSAndrzej Pietrasiewicz */ 319500a2430fSAndrzej Pietrasiewicz ret = ffs_do_descs(ffs->fs_descs_count + 319600a2430fSAndrzej Pietrasiewicz (high ? ffs->hs_descs_count : 0) + 319700a2430fSAndrzej Pietrasiewicz (super ? ffs->ss_descs_count : 0), 319800a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs), d_raw_descs__sz, 319900a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_nums, func); 320000a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 320100a2430fSAndrzej Pietrasiewicz goto error; 320200a2430fSAndrzej Pietrasiewicz 320300a2430fSAndrzej Pietrasiewicz func->function.os_desc_table = vla_ptr(vlabuf, d, os_desc_table); 3204c6010c8bSJim Lin if (c->cdev->use_os_string) { 320500a2430fSAndrzej Pietrasiewicz for (i = 0; i < ffs->interfaces_count; ++i) { 320600a2430fSAndrzej Pietrasiewicz struct usb_os_desc *desc; 320700a2430fSAndrzej Pietrasiewicz 320800a2430fSAndrzej Pietrasiewicz desc = func->function.os_desc_table[i].os_desc = 320900a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, os_desc) + 321000a2430fSAndrzej Pietrasiewicz i * sizeof(struct usb_os_desc); 321100a2430fSAndrzej Pietrasiewicz desc->ext_compat_id = 321200a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, ext_compat) + i * 16; 321300a2430fSAndrzej Pietrasiewicz INIT_LIST_HEAD(&desc->ext_prop); 321400a2430fSAndrzej Pietrasiewicz } 321500a2430fSAndrzej Pietrasiewicz ret = ffs_do_os_descs(ffs->ms_os_descs_count, 321600a2430fSAndrzej Pietrasiewicz vla_ptr(vlabuf, d, raw_descs) + 321700a2430fSAndrzej Pietrasiewicz fs_len + hs_len + ss_len, 3218c6010c8bSJim Lin d_raw_descs__sz - fs_len - hs_len - 3219c6010c8bSJim Lin ss_len, 322000a2430fSAndrzej Pietrasiewicz __ffs_func_bind_do_os_desc, func); 322100a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 322200a2430fSAndrzej Pietrasiewicz goto error; 3223c6010c8bSJim Lin } 322400a2430fSAndrzej Pietrasiewicz func->function.os_desc_n = 322500a2430fSAndrzej Pietrasiewicz c->cdev->use_os_string ? ffs->interfaces_count : 0; 322600a2430fSAndrzej Pietrasiewicz 322700a2430fSAndrzej Pietrasiewicz /* And we're done */ 322800a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_BIND); 322900a2430fSAndrzej Pietrasiewicz return 0; 323000a2430fSAndrzej Pietrasiewicz 323100a2430fSAndrzej Pietrasiewicz error: 323200a2430fSAndrzej Pietrasiewicz /* XXX Do we need to release all claimed endpoints here? */ 323300a2430fSAndrzej Pietrasiewicz return ret; 323400a2430fSAndrzej Pietrasiewicz } 323500a2430fSAndrzej Pietrasiewicz 323600a2430fSAndrzej Pietrasiewicz static int ffs_func_bind(struct usb_configuration *c, 323700a2430fSAndrzej Pietrasiewicz struct usb_function *f) 323800a2430fSAndrzej Pietrasiewicz { 323900a2430fSAndrzej Pietrasiewicz struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c); 324055d81121SRobert Baldyga struct ffs_function *func = ffs_func_from_usb(f); 324155d81121SRobert Baldyga int ret; 324200a2430fSAndrzej Pietrasiewicz 324300a2430fSAndrzej Pietrasiewicz if (IS_ERR(ffs_opts)) 324400a2430fSAndrzej Pietrasiewicz return PTR_ERR(ffs_opts); 324500a2430fSAndrzej Pietrasiewicz 324655d81121SRobert Baldyga ret = _ffs_func_bind(c, f); 324755d81121SRobert Baldyga if (ret && !--ffs_opts->refcnt) 324855d81121SRobert Baldyga functionfs_unbind(func->ffs); 324955d81121SRobert Baldyga 325055d81121SRobert Baldyga return ret; 325100a2430fSAndrzej Pietrasiewicz } 325200a2430fSAndrzej Pietrasiewicz 325300a2430fSAndrzej Pietrasiewicz 325400a2430fSAndrzej Pietrasiewicz /* Other USB function hooks *************************************************/ 325500a2430fSAndrzej Pietrasiewicz 325618d6b32fSRobert Baldyga static void ffs_reset_work(struct work_struct *work) 325718d6b32fSRobert Baldyga { 325818d6b32fSRobert Baldyga struct ffs_data *ffs = container_of(work, 325918d6b32fSRobert Baldyga struct ffs_data, reset_work); 326018d6b32fSRobert Baldyga ffs_data_reset(ffs); 326118d6b32fSRobert Baldyga } 326218d6b32fSRobert Baldyga 326300a2430fSAndrzej Pietrasiewicz static int ffs_func_set_alt(struct usb_function *f, 326400a2430fSAndrzej Pietrasiewicz unsigned interface, unsigned alt) 326500a2430fSAndrzej Pietrasiewicz { 326600a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 326700a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 326800a2430fSAndrzej Pietrasiewicz int ret = 0, intf; 326900a2430fSAndrzej Pietrasiewicz 327000a2430fSAndrzej Pietrasiewicz if (alt != (unsigned)-1) { 327100a2430fSAndrzej Pietrasiewicz intf = ffs_func_revmap_intf(func, interface); 327200a2430fSAndrzej Pietrasiewicz if (unlikely(intf < 0)) 327300a2430fSAndrzej Pietrasiewicz return intf; 327400a2430fSAndrzej Pietrasiewicz } 327500a2430fSAndrzej Pietrasiewicz 327600a2430fSAndrzej Pietrasiewicz if (ffs->func) 327700a2430fSAndrzej Pietrasiewicz ffs_func_eps_disable(ffs->func); 327800a2430fSAndrzej Pietrasiewicz 327918d6b32fSRobert Baldyga if (ffs->state == FFS_DEACTIVATED) { 328018d6b32fSRobert Baldyga ffs->state = FFS_CLOSING; 328118d6b32fSRobert Baldyga INIT_WORK(&ffs->reset_work, ffs_reset_work); 328218d6b32fSRobert Baldyga schedule_work(&ffs->reset_work); 328318d6b32fSRobert Baldyga return -ENODEV; 328418d6b32fSRobert Baldyga } 328518d6b32fSRobert Baldyga 328600a2430fSAndrzej Pietrasiewicz if (ffs->state != FFS_ACTIVE) 328700a2430fSAndrzej Pietrasiewicz return -ENODEV; 328800a2430fSAndrzej Pietrasiewicz 328900a2430fSAndrzej Pietrasiewicz if (alt == (unsigned)-1) { 329000a2430fSAndrzej Pietrasiewicz ffs->func = NULL; 329100a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_DISABLE); 329200a2430fSAndrzej Pietrasiewicz return 0; 329300a2430fSAndrzej Pietrasiewicz } 329400a2430fSAndrzej Pietrasiewicz 329500a2430fSAndrzej Pietrasiewicz ffs->func = func; 329600a2430fSAndrzej Pietrasiewicz ret = ffs_func_eps_enable(func); 329700a2430fSAndrzej Pietrasiewicz if (likely(ret >= 0)) 329800a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_ENABLE); 329900a2430fSAndrzej Pietrasiewicz return ret; 330000a2430fSAndrzej Pietrasiewicz } 330100a2430fSAndrzej Pietrasiewicz 330200a2430fSAndrzej Pietrasiewicz static void ffs_func_disable(struct usb_function *f) 330300a2430fSAndrzej Pietrasiewicz { 330400a2430fSAndrzej Pietrasiewicz ffs_func_set_alt(f, 0, (unsigned)-1); 330500a2430fSAndrzej Pietrasiewicz } 330600a2430fSAndrzej Pietrasiewicz 330700a2430fSAndrzej Pietrasiewicz static int ffs_func_setup(struct usb_function *f, 330800a2430fSAndrzej Pietrasiewicz const struct usb_ctrlrequest *creq) 330900a2430fSAndrzej Pietrasiewicz { 331000a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 331100a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 331200a2430fSAndrzej Pietrasiewicz unsigned long flags; 331300a2430fSAndrzej Pietrasiewicz int ret; 331400a2430fSAndrzej Pietrasiewicz 331500a2430fSAndrzej Pietrasiewicz ENTER(); 331600a2430fSAndrzej Pietrasiewicz 331700a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->bRequestType = %02x\n", creq->bRequestType); 331800a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->bRequest = %02x\n", creq->bRequest); 331900a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->wValue = %04x\n", le16_to_cpu(creq->wValue)); 332000a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->wIndex = %04x\n", le16_to_cpu(creq->wIndex)); 332100a2430fSAndrzej Pietrasiewicz pr_vdebug("creq->wLength = %04x\n", le16_to_cpu(creq->wLength)); 332200a2430fSAndrzej Pietrasiewicz 332300a2430fSAndrzej Pietrasiewicz /* 332400a2430fSAndrzej Pietrasiewicz * Most requests directed to interface go through here 332500a2430fSAndrzej Pietrasiewicz * (notable exceptions are set/get interface) so we need to 332600a2430fSAndrzej Pietrasiewicz * handle them. All other either handled by composite or 332700a2430fSAndrzej Pietrasiewicz * passed to usb_configuration->setup() (if one is set). No 332800a2430fSAndrzej Pietrasiewicz * matter, we will handle requests directed to endpoint here 332954dfce6dSFelix Hädicke * as well (as it's straightforward). Other request recipient 333054dfce6dSFelix Hädicke * types are only handled when the user flag FUNCTIONFS_ALL_CTRL_RECIP 333154dfce6dSFelix Hädicke * is being used. 333200a2430fSAndrzej Pietrasiewicz */ 333300a2430fSAndrzej Pietrasiewicz if (ffs->state != FFS_ACTIVE) 333400a2430fSAndrzej Pietrasiewicz return -ENODEV; 333500a2430fSAndrzej Pietrasiewicz 333600a2430fSAndrzej Pietrasiewicz switch (creq->bRequestType & USB_RECIP_MASK) { 333700a2430fSAndrzej Pietrasiewicz case USB_RECIP_INTERFACE: 333800a2430fSAndrzej Pietrasiewicz ret = ffs_func_revmap_intf(func, le16_to_cpu(creq->wIndex)); 333900a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 334000a2430fSAndrzej Pietrasiewicz return ret; 334100a2430fSAndrzej Pietrasiewicz break; 334200a2430fSAndrzej Pietrasiewicz 334300a2430fSAndrzej Pietrasiewicz case USB_RECIP_ENDPOINT: 334400a2430fSAndrzej Pietrasiewicz ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex)); 334500a2430fSAndrzej Pietrasiewicz if (unlikely(ret < 0)) 334600a2430fSAndrzej Pietrasiewicz return ret; 33471b0bf88fSRobert Baldyga if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR) 33481b0bf88fSRobert Baldyga ret = func->ffs->eps_addrmap[ret]; 334900a2430fSAndrzej Pietrasiewicz break; 335000a2430fSAndrzej Pietrasiewicz 335100a2430fSAndrzej Pietrasiewicz default: 335254dfce6dSFelix Hädicke if (func->ffs->user_flags & FUNCTIONFS_ALL_CTRL_RECIP) 335354dfce6dSFelix Hädicke ret = le16_to_cpu(creq->wIndex); 335454dfce6dSFelix Hädicke else 335500a2430fSAndrzej Pietrasiewicz return -EOPNOTSUPP; 335600a2430fSAndrzej Pietrasiewicz } 335700a2430fSAndrzej Pietrasiewicz 335800a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&ffs->ev.waitq.lock, flags); 335900a2430fSAndrzej Pietrasiewicz ffs->ev.setup = *creq; 336000a2430fSAndrzej Pietrasiewicz ffs->ev.setup.wIndex = cpu_to_le16(ret); 336100a2430fSAndrzej Pietrasiewicz __ffs_event_add(ffs, FUNCTIONFS_SETUP); 336200a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&ffs->ev.waitq.lock, flags); 336300a2430fSAndrzej Pietrasiewicz 33644d644abfSJerry Zhang return creq->wLength == 0 ? USB_GADGET_DELAYED_STATUS : 0; 336500a2430fSAndrzej Pietrasiewicz } 336600a2430fSAndrzej Pietrasiewicz 336754dfce6dSFelix Hädicke static bool ffs_func_req_match(struct usb_function *f, 33681a00b457SFelix Hädicke const struct usb_ctrlrequest *creq, 33691a00b457SFelix Hädicke bool config0) 337054dfce6dSFelix Hädicke { 337154dfce6dSFelix Hädicke struct ffs_function *func = ffs_func_from_usb(f); 337254dfce6dSFelix Hädicke 33734368c28aSFelix Hädicke if (config0 && !(func->ffs->user_flags & FUNCTIONFS_CONFIG0_SETUP)) 33741a00b457SFelix Hädicke return false; 33751a00b457SFelix Hädicke 337654dfce6dSFelix Hädicke switch (creq->bRequestType & USB_RECIP_MASK) { 337754dfce6dSFelix Hädicke case USB_RECIP_INTERFACE: 337805e78c69SFelix Hädicke return (ffs_func_revmap_intf(func, 337905e78c69SFelix Hädicke le16_to_cpu(creq->wIndex)) >= 0); 338054dfce6dSFelix Hädicke case USB_RECIP_ENDPOINT: 338105e78c69SFelix Hädicke return (ffs_func_revmap_ep(func, 338205e78c69SFelix Hädicke le16_to_cpu(creq->wIndex)) >= 0); 338354dfce6dSFelix Hädicke default: 338454dfce6dSFelix Hädicke return (bool) (func->ffs->user_flags & 338554dfce6dSFelix Hädicke FUNCTIONFS_ALL_CTRL_RECIP); 338654dfce6dSFelix Hädicke } 338754dfce6dSFelix Hädicke } 338854dfce6dSFelix Hädicke 338900a2430fSAndrzej Pietrasiewicz static void ffs_func_suspend(struct usb_function *f) 339000a2430fSAndrzej Pietrasiewicz { 339100a2430fSAndrzej Pietrasiewicz ENTER(); 339200a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_SUSPEND); 339300a2430fSAndrzej Pietrasiewicz } 339400a2430fSAndrzej Pietrasiewicz 339500a2430fSAndrzej Pietrasiewicz static void ffs_func_resume(struct usb_function *f) 339600a2430fSAndrzej Pietrasiewicz { 339700a2430fSAndrzej Pietrasiewicz ENTER(); 339800a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs_func_from_usb(f)->ffs, FUNCTIONFS_RESUME); 339900a2430fSAndrzej Pietrasiewicz } 340000a2430fSAndrzej Pietrasiewicz 340100a2430fSAndrzej Pietrasiewicz 340200a2430fSAndrzej Pietrasiewicz /* Endpoint and interface numbers reverse mapping ***************************/ 340300a2430fSAndrzej Pietrasiewicz 340400a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_ep(struct ffs_function *func, u8 num) 340500a2430fSAndrzej Pietrasiewicz { 340600a2430fSAndrzej Pietrasiewicz num = func->eps_revmap[num & USB_ENDPOINT_NUMBER_MASK]; 340700a2430fSAndrzej Pietrasiewicz return num ? num : -EDOM; 340800a2430fSAndrzej Pietrasiewicz } 340900a2430fSAndrzej Pietrasiewicz 341000a2430fSAndrzej Pietrasiewicz static int ffs_func_revmap_intf(struct ffs_function *func, u8 intf) 341100a2430fSAndrzej Pietrasiewicz { 341200a2430fSAndrzej Pietrasiewicz short *nums = func->interfaces_nums; 341300a2430fSAndrzej Pietrasiewicz unsigned count = func->ffs->interfaces_count; 341400a2430fSAndrzej Pietrasiewicz 341500a2430fSAndrzej Pietrasiewicz for (; count; --count, ++nums) { 341600a2430fSAndrzej Pietrasiewicz if (*nums >= 0 && *nums == intf) 341700a2430fSAndrzej Pietrasiewicz return nums - func->interfaces_nums; 341800a2430fSAndrzej Pietrasiewicz } 341900a2430fSAndrzej Pietrasiewicz 342000a2430fSAndrzej Pietrasiewicz return -EDOM; 342100a2430fSAndrzej Pietrasiewicz } 342200a2430fSAndrzej Pietrasiewicz 342300a2430fSAndrzej Pietrasiewicz 342400a2430fSAndrzej Pietrasiewicz /* Devices management *******************************************************/ 342500a2430fSAndrzej Pietrasiewicz 342600a2430fSAndrzej Pietrasiewicz static LIST_HEAD(ffs_devices); 342700a2430fSAndrzej Pietrasiewicz 342800a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_do_find_dev(const char *name) 342900a2430fSAndrzej Pietrasiewicz { 343000a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 343100a2430fSAndrzej Pietrasiewicz 3432ea920bb4SMichal Nazarewicz if (!name) 3433ea920bb4SMichal Nazarewicz return NULL; 3434ea920bb4SMichal Nazarewicz 343500a2430fSAndrzej Pietrasiewicz list_for_each_entry(dev, &ffs_devices, entry) { 343600a2430fSAndrzej Pietrasiewicz if (strcmp(dev->name, name) == 0) 343700a2430fSAndrzej Pietrasiewicz return dev; 343800a2430fSAndrzej Pietrasiewicz } 343900a2430fSAndrzej Pietrasiewicz 344000a2430fSAndrzej Pietrasiewicz return NULL; 344100a2430fSAndrzej Pietrasiewicz } 344200a2430fSAndrzej Pietrasiewicz 344300a2430fSAndrzej Pietrasiewicz /* 344400a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 344500a2430fSAndrzej Pietrasiewicz */ 344600a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_get_single_dev(void) 344700a2430fSAndrzej Pietrasiewicz { 344800a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 344900a2430fSAndrzej Pietrasiewicz 345000a2430fSAndrzej Pietrasiewicz if (list_is_singular(&ffs_devices)) { 345100a2430fSAndrzej Pietrasiewicz dev = list_first_entry(&ffs_devices, struct ffs_dev, entry); 345200a2430fSAndrzej Pietrasiewicz if (dev->single) 345300a2430fSAndrzej Pietrasiewicz return dev; 345400a2430fSAndrzej Pietrasiewicz } 345500a2430fSAndrzej Pietrasiewicz 345600a2430fSAndrzej Pietrasiewicz return NULL; 345700a2430fSAndrzej Pietrasiewicz } 345800a2430fSAndrzej Pietrasiewicz 345900a2430fSAndrzej Pietrasiewicz /* 346000a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 346100a2430fSAndrzej Pietrasiewicz */ 346200a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_find_dev(const char *name) 346300a2430fSAndrzej Pietrasiewicz { 346400a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 346500a2430fSAndrzej Pietrasiewicz 346600a2430fSAndrzej Pietrasiewicz dev = _ffs_get_single_dev(); 346700a2430fSAndrzej Pietrasiewicz if (dev) 346800a2430fSAndrzej Pietrasiewicz return dev; 346900a2430fSAndrzej Pietrasiewicz 347000a2430fSAndrzej Pietrasiewicz return _ffs_do_find_dev(name); 347100a2430fSAndrzej Pietrasiewicz } 347200a2430fSAndrzej Pietrasiewicz 347300a2430fSAndrzej Pietrasiewicz /* Configfs support *********************************************************/ 347400a2430fSAndrzej Pietrasiewicz 347500a2430fSAndrzej Pietrasiewicz static inline struct f_fs_opts *to_ffs_opts(struct config_item *item) 347600a2430fSAndrzej Pietrasiewicz { 347700a2430fSAndrzej Pietrasiewicz return container_of(to_config_group(item), struct f_fs_opts, 347800a2430fSAndrzej Pietrasiewicz func_inst.group); 347900a2430fSAndrzej Pietrasiewicz } 348000a2430fSAndrzej Pietrasiewicz 348100a2430fSAndrzej Pietrasiewicz static void ffs_attr_release(struct config_item *item) 348200a2430fSAndrzej Pietrasiewicz { 348300a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts = to_ffs_opts(item); 348400a2430fSAndrzej Pietrasiewicz 348500a2430fSAndrzej Pietrasiewicz usb_put_function_instance(&opts->func_inst); 348600a2430fSAndrzej Pietrasiewicz } 348700a2430fSAndrzej Pietrasiewicz 348800a2430fSAndrzej Pietrasiewicz static struct configfs_item_operations ffs_item_ops = { 348900a2430fSAndrzej Pietrasiewicz .release = ffs_attr_release, 349000a2430fSAndrzej Pietrasiewicz }; 349100a2430fSAndrzej Pietrasiewicz 349297363902SBhumika Goyal static const struct config_item_type ffs_func_type = { 349300a2430fSAndrzej Pietrasiewicz .ct_item_ops = &ffs_item_ops, 349400a2430fSAndrzej Pietrasiewicz .ct_owner = THIS_MODULE, 349500a2430fSAndrzej Pietrasiewicz }; 349600a2430fSAndrzej Pietrasiewicz 349700a2430fSAndrzej Pietrasiewicz 349800a2430fSAndrzej Pietrasiewicz /* Function registration interface ******************************************/ 349900a2430fSAndrzej Pietrasiewicz 350000a2430fSAndrzej Pietrasiewicz static void ffs_free_inst(struct usb_function_instance *f) 350100a2430fSAndrzej Pietrasiewicz { 350200a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts; 350300a2430fSAndrzej Pietrasiewicz 350400a2430fSAndrzej Pietrasiewicz opts = to_f_fs_opts(f); 350500a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 350600a2430fSAndrzej Pietrasiewicz _ffs_free_dev(opts->dev); 350700a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 350800a2430fSAndrzej Pietrasiewicz kfree(opts); 350900a2430fSAndrzej Pietrasiewicz } 351000a2430fSAndrzej Pietrasiewicz 351100a2430fSAndrzej Pietrasiewicz static int ffs_set_inst_name(struct usb_function_instance *fi, const char *name) 351200a2430fSAndrzej Pietrasiewicz { 3513ea920bb4SMichal Nazarewicz if (strlen(name) >= FIELD_SIZEOF(struct ffs_dev, name)) 351400a2430fSAndrzej Pietrasiewicz return -ENAMETOOLONG; 3515ea920bb4SMichal Nazarewicz return ffs_name_dev(to_f_fs_opts(fi)->dev, name); 351600a2430fSAndrzej Pietrasiewicz } 351700a2430fSAndrzej Pietrasiewicz 351800a2430fSAndrzej Pietrasiewicz static struct usb_function_instance *ffs_alloc_inst(void) 351900a2430fSAndrzej Pietrasiewicz { 352000a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts; 352100a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 352200a2430fSAndrzej Pietrasiewicz 352300a2430fSAndrzej Pietrasiewicz opts = kzalloc(sizeof(*opts), GFP_KERNEL); 352400a2430fSAndrzej Pietrasiewicz if (!opts) 352500a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 352600a2430fSAndrzej Pietrasiewicz 352700a2430fSAndrzej Pietrasiewicz opts->func_inst.set_inst_name = ffs_set_inst_name; 352800a2430fSAndrzej Pietrasiewicz opts->func_inst.free_func_inst = ffs_free_inst; 352900a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 353000a2430fSAndrzej Pietrasiewicz dev = _ffs_alloc_dev(); 353100a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 353200a2430fSAndrzej Pietrasiewicz if (IS_ERR(dev)) { 353300a2430fSAndrzej Pietrasiewicz kfree(opts); 353400a2430fSAndrzej Pietrasiewicz return ERR_CAST(dev); 353500a2430fSAndrzej Pietrasiewicz } 353600a2430fSAndrzej Pietrasiewicz opts->dev = dev; 353700a2430fSAndrzej Pietrasiewicz dev->opts = opts; 353800a2430fSAndrzej Pietrasiewicz 353900a2430fSAndrzej Pietrasiewicz config_group_init_type_name(&opts->func_inst.group, "", 354000a2430fSAndrzej Pietrasiewicz &ffs_func_type); 354100a2430fSAndrzej Pietrasiewicz return &opts->func_inst; 354200a2430fSAndrzej Pietrasiewicz } 354300a2430fSAndrzej Pietrasiewicz 354400a2430fSAndrzej Pietrasiewicz static void ffs_free(struct usb_function *f) 354500a2430fSAndrzej Pietrasiewicz { 354600a2430fSAndrzej Pietrasiewicz kfree(ffs_func_from_usb(f)); 354700a2430fSAndrzej Pietrasiewicz } 354800a2430fSAndrzej Pietrasiewicz 354900a2430fSAndrzej Pietrasiewicz static void ffs_func_unbind(struct usb_configuration *c, 355000a2430fSAndrzej Pietrasiewicz struct usb_function *f) 355100a2430fSAndrzej Pietrasiewicz { 355200a2430fSAndrzej Pietrasiewicz struct ffs_function *func = ffs_func_from_usb(f); 355300a2430fSAndrzej Pietrasiewicz struct ffs_data *ffs = func->ffs; 355400a2430fSAndrzej Pietrasiewicz struct f_fs_opts *opts = 355500a2430fSAndrzej Pietrasiewicz container_of(f->fi, struct f_fs_opts, func_inst); 355600a2430fSAndrzej Pietrasiewicz struct ffs_ep *ep = func->eps; 355700a2430fSAndrzej Pietrasiewicz unsigned count = ffs->eps_count; 355800a2430fSAndrzej Pietrasiewicz unsigned long flags; 355900a2430fSAndrzej Pietrasiewicz 356000a2430fSAndrzej Pietrasiewicz ENTER(); 356100a2430fSAndrzej Pietrasiewicz if (ffs->func == func) { 356200a2430fSAndrzej Pietrasiewicz ffs_func_eps_disable(func); 356300a2430fSAndrzej Pietrasiewicz ffs->func = NULL; 356400a2430fSAndrzej Pietrasiewicz } 356500a2430fSAndrzej Pietrasiewicz 356600a2430fSAndrzej Pietrasiewicz if (!--opts->refcnt) 356700a2430fSAndrzej Pietrasiewicz functionfs_unbind(ffs); 356800a2430fSAndrzej Pietrasiewicz 356900a2430fSAndrzej Pietrasiewicz /* cleanup after autoconfig */ 357000a2430fSAndrzej Pietrasiewicz spin_lock_irqsave(&func->ffs->eps_lock, flags); 357108f37148SVincent Pelletier while (count--) { 357200a2430fSAndrzej Pietrasiewicz if (ep->ep && ep->req) 357300a2430fSAndrzej Pietrasiewicz usb_ep_free_request(ep->ep, ep->req); 357400a2430fSAndrzej Pietrasiewicz ep->req = NULL; 357500a2430fSAndrzej Pietrasiewicz ++ep; 357608f37148SVincent Pelletier } 357700a2430fSAndrzej Pietrasiewicz spin_unlock_irqrestore(&func->ffs->eps_lock, flags); 357800a2430fSAndrzej Pietrasiewicz kfree(func->eps); 357900a2430fSAndrzej Pietrasiewicz func->eps = NULL; 358000a2430fSAndrzej Pietrasiewicz /* 358100a2430fSAndrzej Pietrasiewicz * eps, descriptors and interfaces_nums are allocated in the 358200a2430fSAndrzej Pietrasiewicz * same chunk so only one free is required. 358300a2430fSAndrzej Pietrasiewicz */ 358400a2430fSAndrzej Pietrasiewicz func->function.fs_descriptors = NULL; 358500a2430fSAndrzej Pietrasiewicz func->function.hs_descriptors = NULL; 358600a2430fSAndrzej Pietrasiewicz func->function.ss_descriptors = NULL; 358700a2430fSAndrzej Pietrasiewicz func->interfaces_nums = NULL; 358800a2430fSAndrzej Pietrasiewicz 358900a2430fSAndrzej Pietrasiewicz ffs_event_add(ffs, FUNCTIONFS_UNBIND); 359000a2430fSAndrzej Pietrasiewicz } 359100a2430fSAndrzej Pietrasiewicz 359200a2430fSAndrzej Pietrasiewicz static struct usb_function *ffs_alloc(struct usb_function_instance *fi) 359300a2430fSAndrzej Pietrasiewicz { 359400a2430fSAndrzej Pietrasiewicz struct ffs_function *func; 359500a2430fSAndrzej Pietrasiewicz 359600a2430fSAndrzej Pietrasiewicz ENTER(); 359700a2430fSAndrzej Pietrasiewicz 359800a2430fSAndrzej Pietrasiewicz func = kzalloc(sizeof(*func), GFP_KERNEL); 359900a2430fSAndrzej Pietrasiewicz if (unlikely(!func)) 360000a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 360100a2430fSAndrzej Pietrasiewicz 360200a2430fSAndrzej Pietrasiewicz func->function.name = "Function FS Gadget"; 360300a2430fSAndrzej Pietrasiewicz 360400a2430fSAndrzej Pietrasiewicz func->function.bind = ffs_func_bind; 360500a2430fSAndrzej Pietrasiewicz func->function.unbind = ffs_func_unbind; 360600a2430fSAndrzej Pietrasiewicz func->function.set_alt = ffs_func_set_alt; 360700a2430fSAndrzej Pietrasiewicz func->function.disable = ffs_func_disable; 360800a2430fSAndrzej Pietrasiewicz func->function.setup = ffs_func_setup; 360954dfce6dSFelix Hädicke func->function.req_match = ffs_func_req_match; 361000a2430fSAndrzej Pietrasiewicz func->function.suspend = ffs_func_suspend; 361100a2430fSAndrzej Pietrasiewicz func->function.resume = ffs_func_resume; 361200a2430fSAndrzej Pietrasiewicz func->function.free_func = ffs_free; 361300a2430fSAndrzej Pietrasiewicz 361400a2430fSAndrzej Pietrasiewicz return &func->function; 361500a2430fSAndrzej Pietrasiewicz } 361600a2430fSAndrzej Pietrasiewicz 361700a2430fSAndrzej Pietrasiewicz /* 361800a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 361900a2430fSAndrzej Pietrasiewicz */ 362000a2430fSAndrzej Pietrasiewicz static struct ffs_dev *_ffs_alloc_dev(void) 362100a2430fSAndrzej Pietrasiewicz { 362200a2430fSAndrzej Pietrasiewicz struct ffs_dev *dev; 362300a2430fSAndrzej Pietrasiewicz int ret; 362400a2430fSAndrzej Pietrasiewicz 362500a2430fSAndrzej Pietrasiewicz if (_ffs_get_single_dev()) 362600a2430fSAndrzej Pietrasiewicz return ERR_PTR(-EBUSY); 362700a2430fSAndrzej Pietrasiewicz 362800a2430fSAndrzej Pietrasiewicz dev = kzalloc(sizeof(*dev), GFP_KERNEL); 362900a2430fSAndrzej Pietrasiewicz if (!dev) 363000a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 363100a2430fSAndrzej Pietrasiewicz 363200a2430fSAndrzej Pietrasiewicz if (list_empty(&ffs_devices)) { 363300a2430fSAndrzej Pietrasiewicz ret = functionfs_init(); 363400a2430fSAndrzej Pietrasiewicz if (ret) { 363500a2430fSAndrzej Pietrasiewicz kfree(dev); 363600a2430fSAndrzej Pietrasiewicz return ERR_PTR(ret); 363700a2430fSAndrzej Pietrasiewicz } 363800a2430fSAndrzej Pietrasiewicz } 363900a2430fSAndrzej Pietrasiewicz 364000a2430fSAndrzej Pietrasiewicz list_add(&dev->entry, &ffs_devices); 364100a2430fSAndrzej Pietrasiewicz 364200a2430fSAndrzej Pietrasiewicz return dev; 364300a2430fSAndrzej Pietrasiewicz } 364400a2430fSAndrzej Pietrasiewicz 364500a2430fSAndrzej Pietrasiewicz int ffs_name_dev(struct ffs_dev *dev, const char *name) 364600a2430fSAndrzej Pietrasiewicz { 3647ea920bb4SMichal Nazarewicz struct ffs_dev *existing; 3648ea920bb4SMichal Nazarewicz int ret = 0; 364900a2430fSAndrzej Pietrasiewicz 365000a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 3651ea920bb4SMichal Nazarewicz 3652ea920bb4SMichal Nazarewicz existing = _ffs_do_find_dev(name); 3653ea920bb4SMichal Nazarewicz if (!existing) 3654ea920bb4SMichal Nazarewicz strlcpy(dev->name, name, ARRAY_SIZE(dev->name)); 3655ea920bb4SMichal Nazarewicz else if (existing != dev) 3656ea920bb4SMichal Nazarewicz ret = -EBUSY; 3657ea920bb4SMichal Nazarewicz 365800a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 365900a2430fSAndrzej Pietrasiewicz 366000a2430fSAndrzej Pietrasiewicz return ret; 366100a2430fSAndrzej Pietrasiewicz } 366200a2430fSAndrzej Pietrasiewicz EXPORT_SYMBOL_GPL(ffs_name_dev); 366300a2430fSAndrzej Pietrasiewicz 366400a2430fSAndrzej Pietrasiewicz int ffs_single_dev(struct ffs_dev *dev) 366500a2430fSAndrzej Pietrasiewicz { 366600a2430fSAndrzej Pietrasiewicz int ret; 366700a2430fSAndrzej Pietrasiewicz 366800a2430fSAndrzej Pietrasiewicz ret = 0; 366900a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 367000a2430fSAndrzej Pietrasiewicz 367100a2430fSAndrzej Pietrasiewicz if (!list_is_singular(&ffs_devices)) 367200a2430fSAndrzej Pietrasiewicz ret = -EBUSY; 367300a2430fSAndrzej Pietrasiewicz else 367400a2430fSAndrzej Pietrasiewicz dev->single = true; 367500a2430fSAndrzej Pietrasiewicz 367600a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 367700a2430fSAndrzej Pietrasiewicz return ret; 367800a2430fSAndrzej Pietrasiewicz } 367900a2430fSAndrzej Pietrasiewicz EXPORT_SYMBOL_GPL(ffs_single_dev); 368000a2430fSAndrzej Pietrasiewicz 368100a2430fSAndrzej Pietrasiewicz /* 368200a2430fSAndrzej Pietrasiewicz * ffs_lock must be taken by the caller of this function 368300a2430fSAndrzej Pietrasiewicz */ 368400a2430fSAndrzej Pietrasiewicz static void _ffs_free_dev(struct ffs_dev *dev) 368500a2430fSAndrzej Pietrasiewicz { 368600a2430fSAndrzej Pietrasiewicz list_del(&dev->entry); 36873262ad82SJim Baxter 36883262ad82SJim Baxter /* Clear the private_data pointer to stop incorrect dev access */ 36893262ad82SJim Baxter if (dev->ffs_data) 36903262ad82SJim Baxter dev->ffs_data->private_data = NULL; 36913262ad82SJim Baxter 369200a2430fSAndrzej Pietrasiewicz kfree(dev); 369300a2430fSAndrzej Pietrasiewicz if (list_empty(&ffs_devices)) 369400a2430fSAndrzej Pietrasiewicz functionfs_cleanup(); 369500a2430fSAndrzej Pietrasiewicz } 369600a2430fSAndrzej Pietrasiewicz 369700a2430fSAndrzej Pietrasiewicz static void *ffs_acquire_dev(const char *dev_name) 369800a2430fSAndrzej Pietrasiewicz { 369900a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_dev; 370000a2430fSAndrzej Pietrasiewicz 370100a2430fSAndrzej Pietrasiewicz ENTER(); 370200a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 370300a2430fSAndrzej Pietrasiewicz 370400a2430fSAndrzej Pietrasiewicz ffs_dev = _ffs_find_dev(dev_name); 370500a2430fSAndrzej Pietrasiewicz if (!ffs_dev) 370600a2430fSAndrzej Pietrasiewicz ffs_dev = ERR_PTR(-ENOENT); 370700a2430fSAndrzej Pietrasiewicz else if (ffs_dev->mounted) 370800a2430fSAndrzej Pietrasiewicz ffs_dev = ERR_PTR(-EBUSY); 370900a2430fSAndrzej Pietrasiewicz else if (ffs_dev->ffs_acquire_dev_callback && 371000a2430fSAndrzej Pietrasiewicz ffs_dev->ffs_acquire_dev_callback(ffs_dev)) 371100a2430fSAndrzej Pietrasiewicz ffs_dev = ERR_PTR(-ENOENT); 371200a2430fSAndrzej Pietrasiewicz else 371300a2430fSAndrzej Pietrasiewicz ffs_dev->mounted = true; 371400a2430fSAndrzej Pietrasiewicz 371500a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 371600a2430fSAndrzej Pietrasiewicz return ffs_dev; 371700a2430fSAndrzej Pietrasiewicz } 371800a2430fSAndrzej Pietrasiewicz 371900a2430fSAndrzej Pietrasiewicz static void ffs_release_dev(struct ffs_data *ffs_data) 372000a2430fSAndrzej Pietrasiewicz { 372100a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_dev; 372200a2430fSAndrzej Pietrasiewicz 372300a2430fSAndrzej Pietrasiewicz ENTER(); 372400a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 372500a2430fSAndrzej Pietrasiewicz 372600a2430fSAndrzej Pietrasiewicz ffs_dev = ffs_data->private_data; 372700a2430fSAndrzej Pietrasiewicz if (ffs_dev) { 372800a2430fSAndrzej Pietrasiewicz ffs_dev->mounted = false; 372900a2430fSAndrzej Pietrasiewicz 373000a2430fSAndrzej Pietrasiewicz if (ffs_dev->ffs_release_dev_callback) 373100a2430fSAndrzej Pietrasiewicz ffs_dev->ffs_release_dev_callback(ffs_dev); 373200a2430fSAndrzej Pietrasiewicz } 373300a2430fSAndrzej Pietrasiewicz 373400a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 373500a2430fSAndrzej Pietrasiewicz } 373600a2430fSAndrzej Pietrasiewicz 373700a2430fSAndrzej Pietrasiewicz static int ffs_ready(struct ffs_data *ffs) 373800a2430fSAndrzej Pietrasiewicz { 373900a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_obj; 374000a2430fSAndrzej Pietrasiewicz int ret = 0; 374100a2430fSAndrzej Pietrasiewicz 374200a2430fSAndrzej Pietrasiewicz ENTER(); 374300a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 374400a2430fSAndrzej Pietrasiewicz 374500a2430fSAndrzej Pietrasiewicz ffs_obj = ffs->private_data; 374600a2430fSAndrzej Pietrasiewicz if (!ffs_obj) { 374700a2430fSAndrzej Pietrasiewicz ret = -EINVAL; 374800a2430fSAndrzej Pietrasiewicz goto done; 374900a2430fSAndrzej Pietrasiewicz } 375000a2430fSAndrzej Pietrasiewicz if (WARN_ON(ffs_obj->desc_ready)) { 375100a2430fSAndrzej Pietrasiewicz ret = -EBUSY; 375200a2430fSAndrzej Pietrasiewicz goto done; 375300a2430fSAndrzej Pietrasiewicz } 375400a2430fSAndrzej Pietrasiewicz 375500a2430fSAndrzej Pietrasiewicz ffs_obj->desc_ready = true; 375600a2430fSAndrzej Pietrasiewicz ffs_obj->ffs_data = ffs; 375700a2430fSAndrzej Pietrasiewicz 375849a79d8bSKrzysztof Opasiak if (ffs_obj->ffs_ready_callback) { 375900a2430fSAndrzej Pietrasiewicz ret = ffs_obj->ffs_ready_callback(ffs); 376049a79d8bSKrzysztof Opasiak if (ret) 376149a79d8bSKrzysztof Opasiak goto done; 376249a79d8bSKrzysztof Opasiak } 376300a2430fSAndrzej Pietrasiewicz 376449a79d8bSKrzysztof Opasiak set_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags); 376500a2430fSAndrzej Pietrasiewicz done: 376600a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 376700a2430fSAndrzej Pietrasiewicz return ret; 376800a2430fSAndrzej Pietrasiewicz } 376900a2430fSAndrzej Pietrasiewicz 377000a2430fSAndrzej Pietrasiewicz static void ffs_closed(struct ffs_data *ffs) 377100a2430fSAndrzej Pietrasiewicz { 377200a2430fSAndrzej Pietrasiewicz struct ffs_dev *ffs_obj; 3773f14e9ad1SRui Miguel Silva struct f_fs_opts *opts; 3774b3ce3ce0SBaolin Wang struct config_item *ci; 377500a2430fSAndrzej Pietrasiewicz 377600a2430fSAndrzej Pietrasiewicz ENTER(); 377700a2430fSAndrzej Pietrasiewicz ffs_dev_lock(); 377800a2430fSAndrzej Pietrasiewicz 377900a2430fSAndrzej Pietrasiewicz ffs_obj = ffs->private_data; 378000a2430fSAndrzej Pietrasiewicz if (!ffs_obj) 378100a2430fSAndrzej Pietrasiewicz goto done; 378200a2430fSAndrzej Pietrasiewicz 378300a2430fSAndrzej Pietrasiewicz ffs_obj->desc_ready = false; 3784cdafb6d8SAndrew Gabbasov ffs_obj->ffs_data = NULL; 378500a2430fSAndrzej Pietrasiewicz 378649a79d8bSKrzysztof Opasiak if (test_and_clear_bit(FFS_FL_CALL_CLOSED_CALLBACK, &ffs->flags) && 378749a79d8bSKrzysztof Opasiak ffs_obj->ffs_closed_callback) 378800a2430fSAndrzej Pietrasiewicz ffs_obj->ffs_closed_callback(ffs); 378900a2430fSAndrzej Pietrasiewicz 3790f14e9ad1SRui Miguel Silva if (ffs_obj->opts) 3791f14e9ad1SRui Miguel Silva opts = ffs_obj->opts; 3792f14e9ad1SRui Miguel Silva else 3793f14e9ad1SRui Miguel Silva goto done; 3794f14e9ad1SRui Miguel Silva 3795f14e9ad1SRui Miguel Silva if (opts->no_configfs || !opts->func_inst.group.cg_item.ci_parent 37962c935bc5SPeter Zijlstra || !kref_read(&opts->func_inst.group.cg_item.ci_kref)) 379700a2430fSAndrzej Pietrasiewicz goto done; 379800a2430fSAndrzej Pietrasiewicz 3799b3ce3ce0SBaolin Wang ci = opts->func_inst.group.cg_item.ci_parent->ci_parent; 3800b3ce3ce0SBaolin Wang ffs_dev_unlock(); 3801b3ce3ce0SBaolin Wang 3802ce5bf9a5SHemant Kumar if (test_bit(FFS_FL_BOUND, &ffs->flags)) 3803b3ce3ce0SBaolin Wang unregister_gadget_item(ci); 3804b3ce3ce0SBaolin Wang return; 380500a2430fSAndrzej Pietrasiewicz done: 380600a2430fSAndrzej Pietrasiewicz ffs_dev_unlock(); 380700a2430fSAndrzej Pietrasiewicz } 380800a2430fSAndrzej Pietrasiewicz 380900a2430fSAndrzej Pietrasiewicz /* Misc helper functions ****************************************************/ 381000a2430fSAndrzej Pietrasiewicz 381100a2430fSAndrzej Pietrasiewicz static int ffs_mutex_lock(struct mutex *mutex, unsigned nonblock) 381200a2430fSAndrzej Pietrasiewicz { 381300a2430fSAndrzej Pietrasiewicz return nonblock 381400a2430fSAndrzej Pietrasiewicz ? likely(mutex_trylock(mutex)) ? 0 : -EAGAIN 381500a2430fSAndrzej Pietrasiewicz : mutex_lock_interruptible(mutex); 381600a2430fSAndrzej Pietrasiewicz } 381700a2430fSAndrzej Pietrasiewicz 381800a2430fSAndrzej Pietrasiewicz static char *ffs_prepare_buffer(const char __user *buf, size_t len) 381900a2430fSAndrzej Pietrasiewicz { 382000a2430fSAndrzej Pietrasiewicz char *data; 382100a2430fSAndrzej Pietrasiewicz 382200a2430fSAndrzej Pietrasiewicz if (unlikely(!len)) 382300a2430fSAndrzej Pietrasiewicz return NULL; 382400a2430fSAndrzej Pietrasiewicz 382500a2430fSAndrzej Pietrasiewicz data = kmalloc(len, GFP_KERNEL); 382600a2430fSAndrzej Pietrasiewicz if (unlikely(!data)) 382700a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM); 382800a2430fSAndrzej Pietrasiewicz 38297fe9a937SDaniel Walter if (unlikely(copy_from_user(data, buf, len))) { 383000a2430fSAndrzej Pietrasiewicz kfree(data); 383100a2430fSAndrzej Pietrasiewicz return ERR_PTR(-EFAULT); 383200a2430fSAndrzej Pietrasiewicz } 383300a2430fSAndrzej Pietrasiewicz 383400a2430fSAndrzej Pietrasiewicz pr_vdebug("Buffer from user space:\n"); 383500a2430fSAndrzej Pietrasiewicz ffs_dump_mem("", data, len); 383600a2430fSAndrzej Pietrasiewicz 383700a2430fSAndrzej Pietrasiewicz return data; 383800a2430fSAndrzej Pietrasiewicz } 383900a2430fSAndrzej Pietrasiewicz 384000a2430fSAndrzej Pietrasiewicz DECLARE_USB_FUNCTION_INIT(ffs, ffs_alloc_inst, ffs_alloc); 384100a2430fSAndrzej Pietrasiewicz MODULE_LICENSE("GPL"); 384200a2430fSAndrzej Pietrasiewicz MODULE_AUTHOR("Michal Nazarewicz"); 3843