15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 28443f2d2SAndrzej Pietrasiewicz /* 38443f2d2SAndrzej Pietrasiewicz * inode.c -- user mode filesystem api for usb gadget controllers 48443f2d2SAndrzej Pietrasiewicz * 58443f2d2SAndrzej Pietrasiewicz * Copyright (C) 2003-2004 David Brownell 68443f2d2SAndrzej Pietrasiewicz * Copyright (C) 2003 Agilent Technologies 78443f2d2SAndrzej Pietrasiewicz */ 88443f2d2SAndrzej Pietrasiewicz 98443f2d2SAndrzej Pietrasiewicz 108443f2d2SAndrzej Pietrasiewicz /* #define VERBOSE_DEBUG */ 118443f2d2SAndrzej Pietrasiewicz 128443f2d2SAndrzej Pietrasiewicz #include <linux/init.h> 138443f2d2SAndrzej Pietrasiewicz #include <linux/module.h> 148443f2d2SAndrzej Pietrasiewicz #include <linux/fs.h> 15e5d82a73SDavid Howells #include <linux/fs_context.h> 168443f2d2SAndrzej Pietrasiewicz #include <linux/pagemap.h> 178443f2d2SAndrzej Pietrasiewicz #include <linux/uts.h> 188443f2d2SAndrzej Pietrasiewicz #include <linux/wait.h> 198443f2d2SAndrzej Pietrasiewicz #include <linux/compiler.h> 207c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 218443f2d2SAndrzej Pietrasiewicz #include <linux/sched.h> 228443f2d2SAndrzej Pietrasiewicz #include <linux/slab.h> 238443f2d2SAndrzej Pietrasiewicz #include <linux/poll.h> 248443f2d2SAndrzej Pietrasiewicz #include <linux/mmu_context.h> 258443f2d2SAndrzej Pietrasiewicz #include <linux/aio.h> 26e2e40f2cSChristoph Hellwig #include <linux/uio.h> 27b7ddc981SElena Reshetova #include <linux/refcount.h> 28520b72fcSAlan Stern #include <linux/delay.h> 298443f2d2SAndrzej Pietrasiewicz #include <linux/device.h> 308443f2d2SAndrzej Pietrasiewicz #include <linux/moduleparam.h> 318443f2d2SAndrzej Pietrasiewicz 328443f2d2SAndrzej Pietrasiewicz #include <linux/usb/gadgetfs.h> 338443f2d2SAndrzej Pietrasiewicz #include <linux/usb/gadget.h> 348443f2d2SAndrzej Pietrasiewicz 358443f2d2SAndrzej Pietrasiewicz 368443f2d2SAndrzej Pietrasiewicz /* 378443f2d2SAndrzej Pietrasiewicz * The gadgetfs API maps each endpoint to a file descriptor so that you 388443f2d2SAndrzej Pietrasiewicz * can use standard synchronous read/write calls for I/O. There's some 398443f2d2SAndrzej Pietrasiewicz * O_NONBLOCK and O_ASYNC/FASYNC style i/o support. Example usermode 408443f2d2SAndrzej Pietrasiewicz * drivers show how this works in practice. You can also use AIO to 418443f2d2SAndrzej Pietrasiewicz * eliminate I/O gaps between requests, to help when streaming data. 428443f2d2SAndrzej Pietrasiewicz * 438443f2d2SAndrzej Pietrasiewicz * Key parts that must be USB-specific are protocols defining how the 448443f2d2SAndrzej Pietrasiewicz * read/write operations relate to the hardware state machines. There 458443f2d2SAndrzej Pietrasiewicz * are two types of files. One type is for the device, implementing ep0. 468443f2d2SAndrzej Pietrasiewicz * The other type is for each IN or OUT endpoint. In both cases, the 478443f2d2SAndrzej Pietrasiewicz * user mode driver must configure the hardware before using it. 488443f2d2SAndrzej Pietrasiewicz * 498443f2d2SAndrzej Pietrasiewicz * - First, dev_config() is called when /dev/gadget/$CHIP is configured 508443f2d2SAndrzej Pietrasiewicz * (by writing configuration and device descriptors). Afterwards it 518443f2d2SAndrzej Pietrasiewicz * may serve as a source of device events, used to handle all control 528443f2d2SAndrzej Pietrasiewicz * requests other than basic enumeration. 538443f2d2SAndrzej Pietrasiewicz * 548443f2d2SAndrzej Pietrasiewicz * - Then, after a SET_CONFIGURATION control request, ep_config() is 558443f2d2SAndrzej Pietrasiewicz * called when each /dev/gadget/ep* file is configured (by writing 568443f2d2SAndrzej Pietrasiewicz * endpoint descriptors). Afterwards these files are used to write() 578443f2d2SAndrzej Pietrasiewicz * IN data or to read() OUT data. To halt the endpoint, a "wrong 588443f2d2SAndrzej Pietrasiewicz * direction" request is issued (like reading an IN endpoint). 598443f2d2SAndrzej Pietrasiewicz * 608443f2d2SAndrzej Pietrasiewicz * Unlike "usbfs" the only ioctl()s are for things that are rare, and maybe 618443f2d2SAndrzej Pietrasiewicz * not possible on all hardware. For example, precise fault handling with 628443f2d2SAndrzej Pietrasiewicz * respect to data left in endpoint fifos after aborted operations; or 638443f2d2SAndrzej Pietrasiewicz * selective clearing of endpoint halts, to implement SET_INTERFACE. 648443f2d2SAndrzej Pietrasiewicz */ 658443f2d2SAndrzej Pietrasiewicz 668443f2d2SAndrzej Pietrasiewicz #define DRIVER_DESC "USB Gadget filesystem" 678443f2d2SAndrzej Pietrasiewicz #define DRIVER_VERSION "24 Aug 2004" 688443f2d2SAndrzej Pietrasiewicz 698443f2d2SAndrzej Pietrasiewicz static const char driver_desc [] = DRIVER_DESC; 708443f2d2SAndrzej Pietrasiewicz static const char shortname [] = "gadgetfs"; 718443f2d2SAndrzej Pietrasiewicz 728443f2d2SAndrzej Pietrasiewicz MODULE_DESCRIPTION (DRIVER_DESC); 738443f2d2SAndrzej Pietrasiewicz MODULE_AUTHOR ("David Brownell"); 748443f2d2SAndrzej Pietrasiewicz MODULE_LICENSE ("GPL"); 758443f2d2SAndrzej Pietrasiewicz 76d4461a60SAl Viro static int ep_open(struct inode *, struct file *); 77d4461a60SAl Viro 788443f2d2SAndrzej Pietrasiewicz 798443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 808443f2d2SAndrzej Pietrasiewicz 818443f2d2SAndrzej Pietrasiewicz #define GADGETFS_MAGIC 0xaee71ee7 828443f2d2SAndrzej Pietrasiewicz 838443f2d2SAndrzej Pietrasiewicz /* /dev/gadget/$CHIP represents ep0 and the whole device */ 848443f2d2SAndrzej Pietrasiewicz enum ep0_state { 858a1115ffSMasahiro Yamada /* DISABLED is the initial state. */ 868443f2d2SAndrzej Pietrasiewicz STATE_DEV_DISABLED = 0, 878443f2d2SAndrzej Pietrasiewicz 888443f2d2SAndrzej Pietrasiewicz /* Only one open() of /dev/gadget/$CHIP; only one file tracks 898443f2d2SAndrzej Pietrasiewicz * ep0/device i/o modes and binding to the controller. Driver 908443f2d2SAndrzej Pietrasiewicz * must always write descriptors to initialize the device, then 918443f2d2SAndrzej Pietrasiewicz * the device becomes UNCONNECTED until enumeration. 928443f2d2SAndrzej Pietrasiewicz */ 938443f2d2SAndrzej Pietrasiewicz STATE_DEV_OPENED, 948443f2d2SAndrzej Pietrasiewicz 958443f2d2SAndrzej Pietrasiewicz /* From then on, ep0 fd is in either of two basic modes: 968443f2d2SAndrzej Pietrasiewicz * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it 978443f2d2SAndrzej Pietrasiewicz * - SETUP: read/write will transfer control data and succeed; 988443f2d2SAndrzej Pietrasiewicz * or if "wrong direction", performs protocol stall 998443f2d2SAndrzej Pietrasiewicz */ 1008443f2d2SAndrzej Pietrasiewicz STATE_DEV_UNCONNECTED, 1018443f2d2SAndrzej Pietrasiewicz STATE_DEV_CONNECTED, 1028443f2d2SAndrzej Pietrasiewicz STATE_DEV_SETUP, 1038443f2d2SAndrzej Pietrasiewicz 1048443f2d2SAndrzej Pietrasiewicz /* UNBOUND means the driver closed ep0, so the device won't be 1058443f2d2SAndrzej Pietrasiewicz * accessible again (DEV_DISABLED) until all fds are closed. 1068443f2d2SAndrzej Pietrasiewicz */ 1078443f2d2SAndrzej Pietrasiewicz STATE_DEV_UNBOUND, 1088443f2d2SAndrzej Pietrasiewicz }; 1098443f2d2SAndrzej Pietrasiewicz 1108443f2d2SAndrzej Pietrasiewicz /* enough for the whole queue: most events invalidate others */ 1118443f2d2SAndrzej Pietrasiewicz #define N_EVENT 5 1128443f2d2SAndrzej Pietrasiewicz 1138443f2d2SAndrzej Pietrasiewicz struct dev_data { 1148443f2d2SAndrzej Pietrasiewicz spinlock_t lock; 115b7ddc981SElena Reshetova refcount_t count; 116520b72fcSAlan Stern int udc_usage; 1178443f2d2SAndrzej Pietrasiewicz enum ep0_state state; /* P: lock */ 1188443f2d2SAndrzej Pietrasiewicz struct usb_gadgetfs_event event [N_EVENT]; 1198443f2d2SAndrzej Pietrasiewicz unsigned ev_next; 1208443f2d2SAndrzej Pietrasiewicz struct fasync_struct *fasync; 1218443f2d2SAndrzej Pietrasiewicz u8 current_config; 1228443f2d2SAndrzej Pietrasiewicz 1238443f2d2SAndrzej Pietrasiewicz /* drivers reading ep0 MUST handle control requests (SETUP) 1248443f2d2SAndrzej Pietrasiewicz * reported that way; else the host will time out. 1258443f2d2SAndrzej Pietrasiewicz */ 1268443f2d2SAndrzej Pietrasiewicz unsigned usermode_setup : 1, 1278443f2d2SAndrzej Pietrasiewicz setup_in : 1, 1288443f2d2SAndrzej Pietrasiewicz setup_can_stall : 1, 1298443f2d2SAndrzej Pietrasiewicz setup_out_ready : 1, 1308443f2d2SAndrzej Pietrasiewicz setup_out_error : 1, 1317b0a271dSMarek Szyprowski setup_abort : 1, 1327b0a271dSMarek Szyprowski gadget_registered : 1; 1338443f2d2SAndrzej Pietrasiewicz unsigned setup_wLength; 1348443f2d2SAndrzej Pietrasiewicz 1358443f2d2SAndrzej Pietrasiewicz /* the rest is basically write-once */ 1368443f2d2SAndrzej Pietrasiewicz struct usb_config_descriptor *config, *hs_config; 1378443f2d2SAndrzej Pietrasiewicz struct usb_device_descriptor *dev; 1388443f2d2SAndrzej Pietrasiewicz struct usb_request *req; 1398443f2d2SAndrzej Pietrasiewicz struct usb_gadget *gadget; 1408443f2d2SAndrzej Pietrasiewicz struct list_head epfiles; 1418443f2d2SAndrzej Pietrasiewicz void *buf; 1428443f2d2SAndrzej Pietrasiewicz wait_queue_head_t wait; 1438443f2d2SAndrzej Pietrasiewicz struct super_block *sb; 1448443f2d2SAndrzej Pietrasiewicz struct dentry *dentry; 1458443f2d2SAndrzej Pietrasiewicz 1468443f2d2SAndrzej Pietrasiewicz /* except this scratch i/o buffer for ep0 */ 1478443f2d2SAndrzej Pietrasiewicz u8 rbuf [256]; 1488443f2d2SAndrzej Pietrasiewicz }; 1498443f2d2SAndrzej Pietrasiewicz 1508443f2d2SAndrzej Pietrasiewicz static inline void get_dev (struct dev_data *data) 1518443f2d2SAndrzej Pietrasiewicz { 152b7ddc981SElena Reshetova refcount_inc (&data->count); 1538443f2d2SAndrzej Pietrasiewicz } 1548443f2d2SAndrzej Pietrasiewicz 1558443f2d2SAndrzej Pietrasiewicz static void put_dev (struct dev_data *data) 1568443f2d2SAndrzej Pietrasiewicz { 157b7ddc981SElena Reshetova if (likely (!refcount_dec_and_test (&data->count))) 1588443f2d2SAndrzej Pietrasiewicz return; 1598443f2d2SAndrzej Pietrasiewicz /* needs no more cleanup */ 1608443f2d2SAndrzej Pietrasiewicz BUG_ON (waitqueue_active (&data->wait)); 1618443f2d2SAndrzej Pietrasiewicz kfree (data); 1628443f2d2SAndrzej Pietrasiewicz } 1638443f2d2SAndrzej Pietrasiewicz 1648443f2d2SAndrzej Pietrasiewicz static struct dev_data *dev_new (void) 1658443f2d2SAndrzej Pietrasiewicz { 1668443f2d2SAndrzej Pietrasiewicz struct dev_data *dev; 1678443f2d2SAndrzej Pietrasiewicz 1688443f2d2SAndrzej Pietrasiewicz dev = kzalloc(sizeof(*dev), GFP_KERNEL); 1698443f2d2SAndrzej Pietrasiewicz if (!dev) 1708443f2d2SAndrzej Pietrasiewicz return NULL; 1718443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_DISABLED; 172b7ddc981SElena Reshetova refcount_set (&dev->count, 1); 1738443f2d2SAndrzej Pietrasiewicz spin_lock_init (&dev->lock); 1748443f2d2SAndrzej Pietrasiewicz INIT_LIST_HEAD (&dev->epfiles); 1758443f2d2SAndrzej Pietrasiewicz init_waitqueue_head (&dev->wait); 1768443f2d2SAndrzej Pietrasiewicz return dev; 1778443f2d2SAndrzej Pietrasiewicz } 1788443f2d2SAndrzej Pietrasiewicz 1798443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 1808443f2d2SAndrzej Pietrasiewicz 1818443f2d2SAndrzej Pietrasiewicz /* other /dev/gadget/$ENDPOINT files represent endpoints */ 1828443f2d2SAndrzej Pietrasiewicz enum ep_state { 1838443f2d2SAndrzej Pietrasiewicz STATE_EP_DISABLED = 0, 1848443f2d2SAndrzej Pietrasiewicz STATE_EP_READY, 1858443f2d2SAndrzej Pietrasiewicz STATE_EP_ENABLED, 1868443f2d2SAndrzej Pietrasiewicz STATE_EP_UNBOUND, 1878443f2d2SAndrzej Pietrasiewicz }; 1888443f2d2SAndrzej Pietrasiewicz 1898443f2d2SAndrzej Pietrasiewicz struct ep_data { 1908443f2d2SAndrzej Pietrasiewicz struct mutex lock; 1918443f2d2SAndrzej Pietrasiewicz enum ep_state state; 1928d66db50SElena Reshetova refcount_t count; 1938443f2d2SAndrzej Pietrasiewicz struct dev_data *dev; 1948443f2d2SAndrzej Pietrasiewicz /* must hold dev->lock before accessing ep or req */ 1958443f2d2SAndrzej Pietrasiewicz struct usb_ep *ep; 1968443f2d2SAndrzej Pietrasiewicz struct usb_request *req; 1978443f2d2SAndrzej Pietrasiewicz ssize_t status; 1988443f2d2SAndrzej Pietrasiewicz char name [16]; 1998443f2d2SAndrzej Pietrasiewicz struct usb_endpoint_descriptor desc, hs_desc; 2008443f2d2SAndrzej Pietrasiewicz struct list_head epfiles; 2018443f2d2SAndrzej Pietrasiewicz wait_queue_head_t wait; 2028443f2d2SAndrzej Pietrasiewicz struct dentry *dentry; 2038443f2d2SAndrzej Pietrasiewicz }; 2048443f2d2SAndrzej Pietrasiewicz 2058443f2d2SAndrzej Pietrasiewicz static inline void get_ep (struct ep_data *data) 2068443f2d2SAndrzej Pietrasiewicz { 2078d66db50SElena Reshetova refcount_inc (&data->count); 2088443f2d2SAndrzej Pietrasiewicz } 2098443f2d2SAndrzej Pietrasiewicz 2108443f2d2SAndrzej Pietrasiewicz static void put_ep (struct ep_data *data) 2118443f2d2SAndrzej Pietrasiewicz { 2128d66db50SElena Reshetova if (likely (!refcount_dec_and_test (&data->count))) 2138443f2d2SAndrzej Pietrasiewicz return; 2148443f2d2SAndrzej Pietrasiewicz put_dev (data->dev); 2158443f2d2SAndrzej Pietrasiewicz /* needs no more cleanup */ 2168443f2d2SAndrzej Pietrasiewicz BUG_ON (!list_empty (&data->epfiles)); 2178443f2d2SAndrzej Pietrasiewicz BUG_ON (waitqueue_active (&data->wait)); 2188443f2d2SAndrzej Pietrasiewicz kfree (data); 2198443f2d2SAndrzej Pietrasiewicz } 2208443f2d2SAndrzej Pietrasiewicz 2218443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 2228443f2d2SAndrzej Pietrasiewicz 2238443f2d2SAndrzej Pietrasiewicz /* most "how to use the hardware" policy choices are in userspace: 2248443f2d2SAndrzej Pietrasiewicz * mapping endpoint roles (which the driver needs) to the capabilities 2258443f2d2SAndrzej Pietrasiewicz * which the usb controller has. most of those capabilities are exposed 2268443f2d2SAndrzej Pietrasiewicz * implicitly, starting with the driver name and then endpoint names. 2278443f2d2SAndrzej Pietrasiewicz */ 2288443f2d2SAndrzej Pietrasiewicz 2298443f2d2SAndrzej Pietrasiewicz static const char *CHIP; 2308443f2d2SAndrzej Pietrasiewicz 2318443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 2328443f2d2SAndrzej Pietrasiewicz 2338443f2d2SAndrzej Pietrasiewicz /* NOTE: don't use dev_printk calls before binding to the gadget 2348443f2d2SAndrzej Pietrasiewicz * at the end of ep0 configuration, or after unbind. 2358443f2d2SAndrzej Pietrasiewicz */ 2368443f2d2SAndrzej Pietrasiewicz 2378443f2d2SAndrzej Pietrasiewicz /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */ 2388443f2d2SAndrzej Pietrasiewicz #define xprintk(d,level,fmt,args...) \ 2398443f2d2SAndrzej Pietrasiewicz printk(level "%s: " fmt , shortname , ## args) 2408443f2d2SAndrzej Pietrasiewicz 2418443f2d2SAndrzej Pietrasiewicz #ifdef DEBUG 2428443f2d2SAndrzej Pietrasiewicz #define DBG(dev,fmt,args...) \ 2438443f2d2SAndrzej Pietrasiewicz xprintk(dev , KERN_DEBUG , fmt , ## args) 2448443f2d2SAndrzej Pietrasiewicz #else 2458443f2d2SAndrzej Pietrasiewicz #define DBG(dev,fmt,args...) \ 2468443f2d2SAndrzej Pietrasiewicz do { } while (0) 2478443f2d2SAndrzej Pietrasiewicz #endif /* DEBUG */ 2488443f2d2SAndrzej Pietrasiewicz 2498443f2d2SAndrzej Pietrasiewicz #ifdef VERBOSE_DEBUG 2508443f2d2SAndrzej Pietrasiewicz #define VDEBUG DBG 2518443f2d2SAndrzej Pietrasiewicz #else 2528443f2d2SAndrzej Pietrasiewicz #define VDEBUG(dev,fmt,args...) \ 2538443f2d2SAndrzej Pietrasiewicz do { } while (0) 2548443f2d2SAndrzej Pietrasiewicz #endif /* DEBUG */ 2558443f2d2SAndrzej Pietrasiewicz 2568443f2d2SAndrzej Pietrasiewicz #define ERROR(dev,fmt,args...) \ 2578443f2d2SAndrzej Pietrasiewicz xprintk(dev , KERN_ERR , fmt , ## args) 2588443f2d2SAndrzej Pietrasiewicz #define INFO(dev,fmt,args...) \ 2598443f2d2SAndrzej Pietrasiewicz xprintk(dev , KERN_INFO , fmt , ## args) 2608443f2d2SAndrzej Pietrasiewicz 2618443f2d2SAndrzej Pietrasiewicz 2628443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 2638443f2d2SAndrzej Pietrasiewicz 2648443f2d2SAndrzej Pietrasiewicz /* SYNCHRONOUS ENDPOINT OPERATIONS (bulk/intr/iso) 2658443f2d2SAndrzej Pietrasiewicz * 2668443f2d2SAndrzej Pietrasiewicz * After opening, configure non-control endpoints. Then use normal 2678443f2d2SAndrzej Pietrasiewicz * stream read() and write() requests; and maybe ioctl() to get more 2688443f2d2SAndrzej Pietrasiewicz * precise FIFO status when recovering from cancellation. 2698443f2d2SAndrzej Pietrasiewicz */ 2708443f2d2SAndrzej Pietrasiewicz 2718443f2d2SAndrzej Pietrasiewicz static void epio_complete (struct usb_ep *ep, struct usb_request *req) 2728443f2d2SAndrzej Pietrasiewicz { 2738443f2d2SAndrzej Pietrasiewicz struct ep_data *epdata = ep->driver_data; 2748443f2d2SAndrzej Pietrasiewicz 2758443f2d2SAndrzej Pietrasiewicz if (!req->context) 2768443f2d2SAndrzej Pietrasiewicz return; 2778443f2d2SAndrzej Pietrasiewicz if (req->status) 2788443f2d2SAndrzej Pietrasiewicz epdata->status = req->status; 2798443f2d2SAndrzej Pietrasiewicz else 2808443f2d2SAndrzej Pietrasiewicz epdata->status = req->actual; 2818443f2d2SAndrzej Pietrasiewicz complete ((struct completion *)req->context); 2828443f2d2SAndrzej Pietrasiewicz } 2838443f2d2SAndrzej Pietrasiewicz 2848443f2d2SAndrzej Pietrasiewicz /* tasklock endpoint, returning when it's connected. 2858443f2d2SAndrzej Pietrasiewicz * still need dev->lock to use epdata->ep. 2868443f2d2SAndrzej Pietrasiewicz */ 2878443f2d2SAndrzej Pietrasiewicz static int 288d4461a60SAl Viro get_ready_ep (unsigned f_flags, struct ep_data *epdata, bool is_write) 2898443f2d2SAndrzej Pietrasiewicz { 2908443f2d2SAndrzej Pietrasiewicz int val; 2918443f2d2SAndrzej Pietrasiewicz 2928443f2d2SAndrzej Pietrasiewicz if (f_flags & O_NONBLOCK) { 2938443f2d2SAndrzej Pietrasiewicz if (!mutex_trylock(&epdata->lock)) 2948443f2d2SAndrzej Pietrasiewicz goto nonblock; 295d4461a60SAl Viro if (epdata->state != STATE_EP_ENABLED && 296d4461a60SAl Viro (!is_write || epdata->state != STATE_EP_READY)) { 2978443f2d2SAndrzej Pietrasiewicz mutex_unlock(&epdata->lock); 2988443f2d2SAndrzej Pietrasiewicz nonblock: 2998443f2d2SAndrzej Pietrasiewicz val = -EAGAIN; 3008443f2d2SAndrzej Pietrasiewicz } else 3018443f2d2SAndrzej Pietrasiewicz val = 0; 3028443f2d2SAndrzej Pietrasiewicz return val; 3038443f2d2SAndrzej Pietrasiewicz } 3048443f2d2SAndrzej Pietrasiewicz 3058443f2d2SAndrzej Pietrasiewicz val = mutex_lock_interruptible(&epdata->lock); 3068443f2d2SAndrzej Pietrasiewicz if (val < 0) 3078443f2d2SAndrzej Pietrasiewicz return val; 3088443f2d2SAndrzej Pietrasiewicz 3098443f2d2SAndrzej Pietrasiewicz switch (epdata->state) { 3108443f2d2SAndrzej Pietrasiewicz case STATE_EP_ENABLED: 311d4461a60SAl Viro return 0; 312d4461a60SAl Viro case STATE_EP_READY: /* not configured yet */ 313d4461a60SAl Viro if (is_write) 314d4461a60SAl Viro return 0; 315d4461a60SAl Viro // FALLTHRU 316d4461a60SAl Viro case STATE_EP_UNBOUND: /* clean disconnect */ 3178443f2d2SAndrzej Pietrasiewicz break; 3188443f2d2SAndrzej Pietrasiewicz // case STATE_EP_DISABLED: /* "can't happen" */ 3198443f2d2SAndrzej Pietrasiewicz default: /* error! */ 3208443f2d2SAndrzej Pietrasiewicz pr_debug ("%s: ep %p not available, state %d\n", 3218443f2d2SAndrzej Pietrasiewicz shortname, epdata, epdata->state); 3228443f2d2SAndrzej Pietrasiewicz } 323d4461a60SAl Viro mutex_unlock(&epdata->lock); 324d4461a60SAl Viro return -ENODEV; 3258443f2d2SAndrzej Pietrasiewicz } 3268443f2d2SAndrzej Pietrasiewicz 3278443f2d2SAndrzej Pietrasiewicz static ssize_t 3288443f2d2SAndrzej Pietrasiewicz ep_io (struct ep_data *epdata, void *buf, unsigned len) 3298443f2d2SAndrzej Pietrasiewicz { 3308443f2d2SAndrzej Pietrasiewicz DECLARE_COMPLETION_ONSTACK (done); 3318443f2d2SAndrzej Pietrasiewicz int value; 3328443f2d2SAndrzej Pietrasiewicz 3338443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&epdata->dev->lock); 3348443f2d2SAndrzej Pietrasiewicz if (likely (epdata->ep != NULL)) { 3358443f2d2SAndrzej Pietrasiewicz struct usb_request *req = epdata->req; 3368443f2d2SAndrzej Pietrasiewicz 3378443f2d2SAndrzej Pietrasiewicz req->context = &done; 3388443f2d2SAndrzej Pietrasiewicz req->complete = epio_complete; 3398443f2d2SAndrzej Pietrasiewicz req->buf = buf; 3408443f2d2SAndrzej Pietrasiewicz req->length = len; 3418443f2d2SAndrzej Pietrasiewicz value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC); 3428443f2d2SAndrzej Pietrasiewicz } else 3438443f2d2SAndrzej Pietrasiewicz value = -ENODEV; 3448443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&epdata->dev->lock); 3458443f2d2SAndrzej Pietrasiewicz 3468443f2d2SAndrzej Pietrasiewicz if (likely (value == 0)) { 347c1d51dd5SThomas Gleixner value = wait_for_completion_interruptible(&done); 3488443f2d2SAndrzej Pietrasiewicz if (value != 0) { 3498443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&epdata->dev->lock); 3508443f2d2SAndrzej Pietrasiewicz if (likely (epdata->ep != NULL)) { 3518443f2d2SAndrzej Pietrasiewicz DBG (epdata->dev, "%s i/o interrupted\n", 3528443f2d2SAndrzej Pietrasiewicz epdata->name); 3538443f2d2SAndrzej Pietrasiewicz usb_ep_dequeue (epdata->ep, epdata->req); 3548443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&epdata->dev->lock); 3558443f2d2SAndrzej Pietrasiewicz 356c1d51dd5SThomas Gleixner wait_for_completion(&done); 3578443f2d2SAndrzej Pietrasiewicz if (epdata->status == -ECONNRESET) 3588443f2d2SAndrzej Pietrasiewicz epdata->status = -EINTR; 3598443f2d2SAndrzej Pietrasiewicz } else { 3608443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&epdata->dev->lock); 3618443f2d2SAndrzej Pietrasiewicz 3628443f2d2SAndrzej Pietrasiewicz DBG (epdata->dev, "endpoint gone\n"); 3638443f2d2SAndrzej Pietrasiewicz epdata->status = -ENODEV; 3648443f2d2SAndrzej Pietrasiewicz } 3658443f2d2SAndrzej Pietrasiewicz } 3668443f2d2SAndrzej Pietrasiewicz return epdata->status; 3678443f2d2SAndrzej Pietrasiewicz } 3688443f2d2SAndrzej Pietrasiewicz return value; 3698443f2d2SAndrzej Pietrasiewicz } 3708443f2d2SAndrzej Pietrasiewicz 3718443f2d2SAndrzej Pietrasiewicz static int 3728443f2d2SAndrzej Pietrasiewicz ep_release (struct inode *inode, struct file *fd) 3738443f2d2SAndrzej Pietrasiewicz { 3748443f2d2SAndrzej Pietrasiewicz struct ep_data *data = fd->private_data; 3758443f2d2SAndrzej Pietrasiewicz int value; 3768443f2d2SAndrzej Pietrasiewicz 3778443f2d2SAndrzej Pietrasiewicz value = mutex_lock_interruptible(&data->lock); 3788443f2d2SAndrzej Pietrasiewicz if (value < 0) 3798443f2d2SAndrzej Pietrasiewicz return value; 3808443f2d2SAndrzej Pietrasiewicz 3818443f2d2SAndrzej Pietrasiewicz /* clean up if this can be reopened */ 3828443f2d2SAndrzej Pietrasiewicz if (data->state != STATE_EP_UNBOUND) { 3838443f2d2SAndrzej Pietrasiewicz data->state = STATE_EP_DISABLED; 3848443f2d2SAndrzej Pietrasiewicz data->desc.bDescriptorType = 0; 3858443f2d2SAndrzej Pietrasiewicz data->hs_desc.bDescriptorType = 0; 3868443f2d2SAndrzej Pietrasiewicz usb_ep_disable(data->ep); 3878443f2d2SAndrzej Pietrasiewicz } 3888443f2d2SAndrzej Pietrasiewicz mutex_unlock(&data->lock); 3898443f2d2SAndrzej Pietrasiewicz put_ep (data); 3908443f2d2SAndrzej Pietrasiewicz return 0; 3918443f2d2SAndrzej Pietrasiewicz } 3928443f2d2SAndrzej Pietrasiewicz 3938443f2d2SAndrzej Pietrasiewicz static long ep_ioctl(struct file *fd, unsigned code, unsigned long value) 3948443f2d2SAndrzej Pietrasiewicz { 3958443f2d2SAndrzej Pietrasiewicz struct ep_data *data = fd->private_data; 3968443f2d2SAndrzej Pietrasiewicz int status; 3978443f2d2SAndrzej Pietrasiewicz 398d4461a60SAl Viro if ((status = get_ready_ep (fd->f_flags, data, false)) < 0) 3998443f2d2SAndrzej Pietrasiewicz return status; 4008443f2d2SAndrzej Pietrasiewicz 4018443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&data->dev->lock); 4028443f2d2SAndrzej Pietrasiewicz if (likely (data->ep != NULL)) { 4038443f2d2SAndrzej Pietrasiewicz switch (code) { 4048443f2d2SAndrzej Pietrasiewicz case GADGETFS_FIFO_STATUS: 4058443f2d2SAndrzej Pietrasiewicz status = usb_ep_fifo_status (data->ep); 4068443f2d2SAndrzej Pietrasiewicz break; 4078443f2d2SAndrzej Pietrasiewicz case GADGETFS_FIFO_FLUSH: 4088443f2d2SAndrzej Pietrasiewicz usb_ep_fifo_flush (data->ep); 4098443f2d2SAndrzej Pietrasiewicz break; 4108443f2d2SAndrzej Pietrasiewicz case GADGETFS_CLEAR_HALT: 4118443f2d2SAndrzej Pietrasiewicz status = usb_ep_clear_halt (data->ep); 4128443f2d2SAndrzej Pietrasiewicz break; 4138443f2d2SAndrzej Pietrasiewicz default: 4148443f2d2SAndrzej Pietrasiewicz status = -ENOTTY; 4158443f2d2SAndrzej Pietrasiewicz } 4168443f2d2SAndrzej Pietrasiewicz } else 4178443f2d2SAndrzej Pietrasiewicz status = -ENODEV; 4188443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&data->dev->lock); 4198443f2d2SAndrzej Pietrasiewicz mutex_unlock(&data->lock); 4208443f2d2SAndrzej Pietrasiewicz return status; 4218443f2d2SAndrzej Pietrasiewicz } 4228443f2d2SAndrzej Pietrasiewicz 4238443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 4248443f2d2SAndrzej Pietrasiewicz 4258443f2d2SAndrzej Pietrasiewicz /* ASYNCHRONOUS ENDPOINT I/O OPERATIONS (bulk/intr/iso) */ 4268443f2d2SAndrzej Pietrasiewicz 4278443f2d2SAndrzej Pietrasiewicz struct kiocb_priv { 4288443f2d2SAndrzej Pietrasiewicz struct usb_request *req; 4298443f2d2SAndrzej Pietrasiewicz struct ep_data *epdata; 4308443f2d2SAndrzej Pietrasiewicz struct kiocb *iocb; 4318443f2d2SAndrzej Pietrasiewicz struct mm_struct *mm; 4328443f2d2SAndrzej Pietrasiewicz struct work_struct work; 4338443f2d2SAndrzej Pietrasiewicz void *buf; 4347fe3976eSAl Viro struct iov_iter to; 4357fe3976eSAl Viro const void *to_free; 4368443f2d2SAndrzej Pietrasiewicz unsigned actual; 4378443f2d2SAndrzej Pietrasiewicz }; 4388443f2d2SAndrzej Pietrasiewicz 4398443f2d2SAndrzej Pietrasiewicz static int ep_aio_cancel(struct kiocb *iocb) 4408443f2d2SAndrzej Pietrasiewicz { 4418443f2d2SAndrzej Pietrasiewicz struct kiocb_priv *priv = iocb->private; 4428443f2d2SAndrzej Pietrasiewicz struct ep_data *epdata; 4438443f2d2SAndrzej Pietrasiewicz int value; 4448443f2d2SAndrzej Pietrasiewicz 4458443f2d2SAndrzej Pietrasiewicz local_irq_disable(); 4468443f2d2SAndrzej Pietrasiewicz epdata = priv->epdata; 4478443f2d2SAndrzej Pietrasiewicz // spin_lock(&epdata->dev->lock); 4488443f2d2SAndrzej Pietrasiewicz if (likely(epdata && epdata->ep && priv->req)) 4498443f2d2SAndrzej Pietrasiewicz value = usb_ep_dequeue (epdata->ep, priv->req); 4508443f2d2SAndrzej Pietrasiewicz else 4518443f2d2SAndrzej Pietrasiewicz value = -EINVAL; 4528443f2d2SAndrzej Pietrasiewicz // spin_unlock(&epdata->dev->lock); 4538443f2d2SAndrzej Pietrasiewicz local_irq_enable(); 4548443f2d2SAndrzej Pietrasiewicz 4558443f2d2SAndrzej Pietrasiewicz return value; 4568443f2d2SAndrzej Pietrasiewicz } 4578443f2d2SAndrzej Pietrasiewicz 4588443f2d2SAndrzej Pietrasiewicz static void ep_user_copy_worker(struct work_struct *work) 4598443f2d2SAndrzej Pietrasiewicz { 4608443f2d2SAndrzej Pietrasiewicz struct kiocb_priv *priv = container_of(work, struct kiocb_priv, work); 4618443f2d2SAndrzej Pietrasiewicz struct mm_struct *mm = priv->mm; 4628443f2d2SAndrzej Pietrasiewicz struct kiocb *iocb = priv->iocb; 4638443f2d2SAndrzej Pietrasiewicz size_t ret; 4648443f2d2SAndrzej Pietrasiewicz 4658443f2d2SAndrzej Pietrasiewicz use_mm(mm); 4667fe3976eSAl Viro ret = copy_to_iter(priv->buf, priv->actual, &priv->to); 4678443f2d2SAndrzej Pietrasiewicz unuse_mm(mm); 4687fe3976eSAl Viro if (!ret) 4697fe3976eSAl Viro ret = -EFAULT; 4708443f2d2SAndrzej Pietrasiewicz 4718443f2d2SAndrzej Pietrasiewicz /* completing the iocb can drop the ctx and mm, don't touch mm after */ 47204b2fa9fSChristoph Hellwig iocb->ki_complete(iocb, ret, ret); 4738443f2d2SAndrzej Pietrasiewicz 4748443f2d2SAndrzej Pietrasiewicz kfree(priv->buf); 4757fe3976eSAl Viro kfree(priv->to_free); 4768443f2d2SAndrzej Pietrasiewicz kfree(priv); 4778443f2d2SAndrzej Pietrasiewicz } 4788443f2d2SAndrzej Pietrasiewicz 4798443f2d2SAndrzej Pietrasiewicz static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req) 4808443f2d2SAndrzej Pietrasiewicz { 4818443f2d2SAndrzej Pietrasiewicz struct kiocb *iocb = req->context; 4828443f2d2SAndrzej Pietrasiewicz struct kiocb_priv *priv = iocb->private; 4838443f2d2SAndrzej Pietrasiewicz struct ep_data *epdata = priv->epdata; 4848443f2d2SAndrzej Pietrasiewicz 4858443f2d2SAndrzej Pietrasiewicz /* lock against disconnect (and ideally, cancel) */ 4868443f2d2SAndrzej Pietrasiewicz spin_lock(&epdata->dev->lock); 4878443f2d2SAndrzej Pietrasiewicz priv->req = NULL; 4888443f2d2SAndrzej Pietrasiewicz priv->epdata = NULL; 4898443f2d2SAndrzej Pietrasiewicz 4908443f2d2SAndrzej Pietrasiewicz /* if this was a write or a read returning no data then we 4918443f2d2SAndrzej Pietrasiewicz * don't need to copy anything to userspace, so we can 4928443f2d2SAndrzej Pietrasiewicz * complete the aio request immediately. 4938443f2d2SAndrzej Pietrasiewicz */ 4947fe3976eSAl Viro if (priv->to_free == NULL || unlikely(req->actual == 0)) { 4958443f2d2SAndrzej Pietrasiewicz kfree(req->buf); 4967fe3976eSAl Viro kfree(priv->to_free); 4978443f2d2SAndrzej Pietrasiewicz kfree(priv); 4988443f2d2SAndrzej Pietrasiewicz iocb->private = NULL; 4998443f2d2SAndrzej Pietrasiewicz /* aio_complete() reports bytes-transferred _and_ faults */ 50004b2fa9fSChristoph Hellwig 50104b2fa9fSChristoph Hellwig iocb->ki_complete(iocb, req->actual ? req->actual : req->status, 5028443f2d2SAndrzej Pietrasiewicz req->status); 5038443f2d2SAndrzej Pietrasiewicz } else { 5048443f2d2SAndrzej Pietrasiewicz /* ep_copy_to_user() won't report both; we hide some faults */ 5058443f2d2SAndrzej Pietrasiewicz if (unlikely(0 != req->status)) 5068443f2d2SAndrzej Pietrasiewicz DBG(epdata->dev, "%s fault %d len %d\n", 5078443f2d2SAndrzej Pietrasiewicz ep->name, req->status, req->actual); 5088443f2d2SAndrzej Pietrasiewicz 5098443f2d2SAndrzej Pietrasiewicz priv->buf = req->buf; 5108443f2d2SAndrzej Pietrasiewicz priv->actual = req->actual; 5117fe3976eSAl Viro INIT_WORK(&priv->work, ep_user_copy_worker); 5128443f2d2SAndrzej Pietrasiewicz schedule_work(&priv->work); 5138443f2d2SAndrzej Pietrasiewicz } 5148443f2d2SAndrzej Pietrasiewicz 5158443f2d2SAndrzej Pietrasiewicz usb_ep_free_request(ep, req); 516520b72fcSAlan Stern spin_unlock(&epdata->dev->lock); 5178443f2d2SAndrzej Pietrasiewicz put_ep(epdata); 5188443f2d2SAndrzej Pietrasiewicz } 5198443f2d2SAndrzej Pietrasiewicz 5207fe3976eSAl Viro static ssize_t ep_aio(struct kiocb *iocb, 5217fe3976eSAl Viro struct kiocb_priv *priv, 5228443f2d2SAndrzej Pietrasiewicz struct ep_data *epdata, 5237fe3976eSAl Viro char *buf, 5247fe3976eSAl Viro size_t len) 5258443f2d2SAndrzej Pietrasiewicz { 5268443f2d2SAndrzej Pietrasiewicz struct usb_request *req; 5278443f2d2SAndrzej Pietrasiewicz ssize_t value; 5288443f2d2SAndrzej Pietrasiewicz 5298443f2d2SAndrzej Pietrasiewicz iocb->private = priv; 5308443f2d2SAndrzej Pietrasiewicz priv->iocb = iocb; 5318443f2d2SAndrzej Pietrasiewicz 5328443f2d2SAndrzej Pietrasiewicz kiocb_set_cancel_fn(iocb, ep_aio_cancel); 5338443f2d2SAndrzej Pietrasiewicz get_ep(epdata); 5348443f2d2SAndrzej Pietrasiewicz priv->epdata = epdata; 5358443f2d2SAndrzej Pietrasiewicz priv->actual = 0; 5368443f2d2SAndrzej Pietrasiewicz priv->mm = current->mm; /* mm teardown waits for iocbs in exit_aio() */ 5378443f2d2SAndrzej Pietrasiewicz 5388443f2d2SAndrzej Pietrasiewicz /* each kiocb is coupled to one usb_request, but we can't 5398443f2d2SAndrzej Pietrasiewicz * allocate or submit those if the host disconnected. 5408443f2d2SAndrzej Pietrasiewicz */ 5418443f2d2SAndrzej Pietrasiewicz spin_lock_irq(&epdata->dev->lock); 5427fe3976eSAl Viro value = -ENODEV; 543327b21daSMathieu Laurendeau if (unlikely(epdata->ep == NULL)) 5447fe3976eSAl Viro goto fail; 5457fe3976eSAl Viro 5468443f2d2SAndrzej Pietrasiewicz req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC); 5477fe3976eSAl Viro value = -ENOMEM; 5487fe3976eSAl Viro if (unlikely(!req)) 5497fe3976eSAl Viro goto fail; 5507fe3976eSAl Viro 5518443f2d2SAndrzej Pietrasiewicz priv->req = req; 5528443f2d2SAndrzej Pietrasiewicz req->buf = buf; 5538443f2d2SAndrzej Pietrasiewicz req->length = len; 5548443f2d2SAndrzej Pietrasiewicz req->complete = ep_aio_complete; 5558443f2d2SAndrzej Pietrasiewicz req->context = iocb; 5568443f2d2SAndrzej Pietrasiewicz value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC); 5577fe3976eSAl Viro if (unlikely(0 != value)) { 5588443f2d2SAndrzej Pietrasiewicz usb_ep_free_request(epdata->ep, req); 5597fe3976eSAl Viro goto fail; 5607fe3976eSAl Viro } 5618443f2d2SAndrzej Pietrasiewicz spin_unlock_irq(&epdata->dev->lock); 5627fe3976eSAl Viro return -EIOCBQUEUED; 5638443f2d2SAndrzej Pietrasiewicz 5647fe3976eSAl Viro fail: 5657fe3976eSAl Viro spin_unlock_irq(&epdata->dev->lock); 5667fe3976eSAl Viro kfree(priv->to_free); 5678443f2d2SAndrzej Pietrasiewicz kfree(priv); 5688443f2d2SAndrzej Pietrasiewicz put_ep(epdata); 5698443f2d2SAndrzej Pietrasiewicz return value; 5708443f2d2SAndrzej Pietrasiewicz } 5718443f2d2SAndrzej Pietrasiewicz 5728443f2d2SAndrzej Pietrasiewicz static ssize_t 5737fe3976eSAl Viro ep_read_iter(struct kiocb *iocb, struct iov_iter *to) 5748443f2d2SAndrzej Pietrasiewicz { 5757fe3976eSAl Viro struct file *file = iocb->ki_filp; 5767fe3976eSAl Viro struct ep_data *epdata = file->private_data; 5777fe3976eSAl Viro size_t len = iov_iter_count(to); 5787fe3976eSAl Viro ssize_t value; 5798443f2d2SAndrzej Pietrasiewicz char *buf; 5808443f2d2SAndrzej Pietrasiewicz 581d4461a60SAl Viro if ((value = get_ready_ep(file->f_flags, epdata, false)) < 0) 5827fe3976eSAl Viro return value; 5837fe3976eSAl Viro 5847fe3976eSAl Viro /* halt any endpoint by doing a "wrong direction" i/o call */ 5857fe3976eSAl Viro if (usb_endpoint_dir_in(&epdata->desc)) { 5867fe3976eSAl Viro if (usb_endpoint_xfer_isoc(&epdata->desc) || 5877fe3976eSAl Viro !is_sync_kiocb(iocb)) { 5887fe3976eSAl Viro mutex_unlock(&epdata->lock); 5898443f2d2SAndrzej Pietrasiewicz return -EINVAL; 5907fe3976eSAl Viro } 5917fe3976eSAl Viro DBG (epdata->dev, "%s halt\n", epdata->name); 5927fe3976eSAl Viro spin_lock_irq(&epdata->dev->lock); 5937fe3976eSAl Viro if (likely(epdata->ep != NULL)) 5947fe3976eSAl Viro usb_ep_set_halt(epdata->ep); 5957fe3976eSAl Viro spin_unlock_irq(&epdata->dev->lock); 5967fe3976eSAl Viro mutex_unlock(&epdata->lock); 5977fe3976eSAl Viro return -EBADMSG; 5987fe3976eSAl Viro } 5998443f2d2SAndrzej Pietrasiewicz 6007fe3976eSAl Viro buf = kmalloc(len, GFP_KERNEL); 6017fe3976eSAl Viro if (unlikely(!buf)) { 6027fe3976eSAl Viro mutex_unlock(&epdata->lock); 6038443f2d2SAndrzej Pietrasiewicz return -ENOMEM; 6047fe3976eSAl Viro } 6057fe3976eSAl Viro if (is_sync_kiocb(iocb)) { 6067fe3976eSAl Viro value = ep_io(epdata, buf, len); 60763196e98SBinyamin Sharet if (value >= 0 && (copy_to_iter(buf, value, to) != value)) 6087fe3976eSAl Viro value = -EFAULT; 6097fe3976eSAl Viro } else { 6107fe3976eSAl Viro struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL); 6117fe3976eSAl Viro value = -ENOMEM; 6127fe3976eSAl Viro if (!priv) 6137fe3976eSAl Viro goto fail; 6147fe3976eSAl Viro priv->to_free = dup_iter(&priv->to, to, GFP_KERNEL); 6157fe3976eSAl Viro if (!priv->to_free) { 6167fe3976eSAl Viro kfree(priv); 6177fe3976eSAl Viro goto fail; 6187fe3976eSAl Viro } 6197fe3976eSAl Viro value = ep_aio(iocb, priv, epdata, buf, len); 6207fe3976eSAl Viro if (value == -EIOCBQUEUED) 6217fe3976eSAl Viro buf = NULL; 6227fe3976eSAl Viro } 6237fe3976eSAl Viro fail: 6247fe3976eSAl Viro kfree(buf); 6257fe3976eSAl Viro mutex_unlock(&epdata->lock); 6267fe3976eSAl Viro return value; 6278443f2d2SAndrzej Pietrasiewicz } 6288443f2d2SAndrzej Pietrasiewicz 629d4461a60SAl Viro static ssize_t ep_config(struct ep_data *, const char *, size_t); 630d4461a60SAl Viro 6318443f2d2SAndrzej Pietrasiewicz static ssize_t 6327fe3976eSAl Viro ep_write_iter(struct kiocb *iocb, struct iov_iter *from) 6338443f2d2SAndrzej Pietrasiewicz { 6347fe3976eSAl Viro struct file *file = iocb->ki_filp; 6357fe3976eSAl Viro struct ep_data *epdata = file->private_data; 6367fe3976eSAl Viro size_t len = iov_iter_count(from); 637d4461a60SAl Viro bool configured; 6387fe3976eSAl Viro ssize_t value; 6398443f2d2SAndrzej Pietrasiewicz char *buf; 6408443f2d2SAndrzej Pietrasiewicz 641d4461a60SAl Viro if ((value = get_ready_ep(file->f_flags, epdata, true)) < 0) 6427fe3976eSAl Viro return value; 6437fe3976eSAl Viro 644d4461a60SAl Viro configured = epdata->state == STATE_EP_ENABLED; 645d4461a60SAl Viro 6467fe3976eSAl Viro /* halt any endpoint by doing a "wrong direction" i/o call */ 647d4461a60SAl Viro if (configured && !usb_endpoint_dir_in(&epdata->desc)) { 6487fe3976eSAl Viro if (usb_endpoint_xfer_isoc(&epdata->desc) || 6497fe3976eSAl Viro !is_sync_kiocb(iocb)) { 6507fe3976eSAl Viro mutex_unlock(&epdata->lock); 6518443f2d2SAndrzej Pietrasiewicz return -EINVAL; 6527fe3976eSAl Viro } 6537fe3976eSAl Viro DBG (epdata->dev, "%s halt\n", epdata->name); 6547fe3976eSAl Viro spin_lock_irq(&epdata->dev->lock); 6557fe3976eSAl Viro if (likely(epdata->ep != NULL)) 6567fe3976eSAl Viro usb_ep_set_halt(epdata->ep); 6577fe3976eSAl Viro spin_unlock_irq(&epdata->dev->lock); 6587fe3976eSAl Viro mutex_unlock(&epdata->lock); 6597fe3976eSAl Viro return -EBADMSG; 6607fe3976eSAl Viro } 6618443f2d2SAndrzej Pietrasiewicz 6627fe3976eSAl Viro buf = kmalloc(len, GFP_KERNEL); 6637fe3976eSAl Viro if (unlikely(!buf)) { 6647fe3976eSAl Viro mutex_unlock(&epdata->lock); 6658443f2d2SAndrzej Pietrasiewicz return -ENOMEM; 6667fe3976eSAl Viro } 6678443f2d2SAndrzej Pietrasiewicz 668cbbd26b8SAl Viro if (unlikely(!copy_from_iter_full(buf, len, from))) { 6697fe3976eSAl Viro value = -EFAULT; 6707fe3976eSAl Viro goto out; 6717fe3976eSAl Viro } 6727fe3976eSAl Viro 673d4461a60SAl Viro if (unlikely(!configured)) { 674d4461a60SAl Viro value = ep_config(epdata, buf, len); 675d4461a60SAl Viro } else if (is_sync_kiocb(iocb)) { 6767fe3976eSAl Viro value = ep_io(epdata, buf, len); 6777fe3976eSAl Viro } else { 6787fe3976eSAl Viro struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL); 6797fe3976eSAl Viro value = -ENOMEM; 6807fe3976eSAl Viro if (priv) { 6817fe3976eSAl Viro value = ep_aio(iocb, priv, epdata, buf, len); 6827fe3976eSAl Viro if (value == -EIOCBQUEUED) 6837fe3976eSAl Viro buf = NULL; 6847fe3976eSAl Viro } 6857fe3976eSAl Viro } 6867fe3976eSAl Viro out: 6878443f2d2SAndrzej Pietrasiewicz kfree(buf); 6887fe3976eSAl Viro mutex_unlock(&epdata->lock); 6897fe3976eSAl Viro return value; 6908443f2d2SAndrzej Pietrasiewicz } 6918443f2d2SAndrzej Pietrasiewicz 6928443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 6938443f2d2SAndrzej Pietrasiewicz 6948443f2d2SAndrzej Pietrasiewicz /* used after endpoint configuration */ 6958443f2d2SAndrzej Pietrasiewicz static const struct file_operations ep_io_operations = { 6968443f2d2SAndrzej Pietrasiewicz .owner = THIS_MODULE, 6978443f2d2SAndrzej Pietrasiewicz 698d4461a60SAl Viro .open = ep_open, 699d4461a60SAl Viro .release = ep_release, 700d4461a60SAl Viro .llseek = no_llseek, 7018443f2d2SAndrzej Pietrasiewicz .unlocked_ioctl = ep_ioctl, 7027fe3976eSAl Viro .read_iter = ep_read_iter, 7037fe3976eSAl Viro .write_iter = ep_write_iter, 7048443f2d2SAndrzej Pietrasiewicz }; 7058443f2d2SAndrzej Pietrasiewicz 7068443f2d2SAndrzej Pietrasiewicz /* ENDPOINT INITIALIZATION 7078443f2d2SAndrzej Pietrasiewicz * 7088443f2d2SAndrzej Pietrasiewicz * fd = open ("/dev/gadget/$ENDPOINT", O_RDWR) 7098443f2d2SAndrzej Pietrasiewicz * status = write (fd, descriptors, sizeof descriptors) 7108443f2d2SAndrzej Pietrasiewicz * 7118443f2d2SAndrzej Pietrasiewicz * That write establishes the endpoint configuration, configuring 7128443f2d2SAndrzej Pietrasiewicz * the controller to process bulk, interrupt, or isochronous transfers 7138443f2d2SAndrzej Pietrasiewicz * at the right maxpacket size, and so on. 7148443f2d2SAndrzej Pietrasiewicz * 7158443f2d2SAndrzej Pietrasiewicz * The descriptors are message type 1, identified by a host order u32 7168443f2d2SAndrzej Pietrasiewicz * at the beginning of what's written. Descriptor order is: full/low 7178443f2d2SAndrzej Pietrasiewicz * speed descriptor, then optional high speed descriptor. 7188443f2d2SAndrzej Pietrasiewicz */ 7198443f2d2SAndrzej Pietrasiewicz static ssize_t 720d4461a60SAl Viro ep_config (struct ep_data *data, const char *buf, size_t len) 7218443f2d2SAndrzej Pietrasiewicz { 7228443f2d2SAndrzej Pietrasiewicz struct usb_ep *ep; 7238443f2d2SAndrzej Pietrasiewicz u32 tag; 7248443f2d2SAndrzej Pietrasiewicz int value, length = len; 7258443f2d2SAndrzej Pietrasiewicz 7268443f2d2SAndrzej Pietrasiewicz if (data->state != STATE_EP_READY) { 7278443f2d2SAndrzej Pietrasiewicz value = -EL2HLT; 7288443f2d2SAndrzej Pietrasiewicz goto fail; 7298443f2d2SAndrzej Pietrasiewicz } 7308443f2d2SAndrzej Pietrasiewicz 7318443f2d2SAndrzej Pietrasiewicz value = len; 7328443f2d2SAndrzej Pietrasiewicz if (len < USB_DT_ENDPOINT_SIZE + 4) 7338443f2d2SAndrzej Pietrasiewicz goto fail0; 7348443f2d2SAndrzej Pietrasiewicz 7358443f2d2SAndrzej Pietrasiewicz /* we might need to change message format someday */ 736d4461a60SAl Viro memcpy(&tag, buf, 4); 7378443f2d2SAndrzej Pietrasiewicz if (tag != 1) { 7388443f2d2SAndrzej Pietrasiewicz DBG(data->dev, "config %s, bad tag %d\n", data->name, tag); 7398443f2d2SAndrzej Pietrasiewicz goto fail0; 7408443f2d2SAndrzej Pietrasiewicz } 7418443f2d2SAndrzej Pietrasiewicz buf += 4; 7428443f2d2SAndrzej Pietrasiewicz len -= 4; 7438443f2d2SAndrzej Pietrasiewicz 7448443f2d2SAndrzej Pietrasiewicz /* NOTE: audio endpoint extensions not accepted here; 7458443f2d2SAndrzej Pietrasiewicz * just don't include the extra bytes. 7468443f2d2SAndrzej Pietrasiewicz */ 7478443f2d2SAndrzej Pietrasiewicz 7488443f2d2SAndrzej Pietrasiewicz /* full/low speed descriptor, then high speed */ 749d4461a60SAl Viro memcpy(&data->desc, buf, USB_DT_ENDPOINT_SIZE); 7508443f2d2SAndrzej Pietrasiewicz if (data->desc.bLength != USB_DT_ENDPOINT_SIZE 7518443f2d2SAndrzej Pietrasiewicz || data->desc.bDescriptorType != USB_DT_ENDPOINT) 7528443f2d2SAndrzej Pietrasiewicz goto fail0; 7538443f2d2SAndrzej Pietrasiewicz if (len != USB_DT_ENDPOINT_SIZE) { 7548443f2d2SAndrzej Pietrasiewicz if (len != 2 * USB_DT_ENDPOINT_SIZE) 7558443f2d2SAndrzej Pietrasiewicz goto fail0; 756d4461a60SAl Viro memcpy(&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE, 757d4461a60SAl Viro USB_DT_ENDPOINT_SIZE); 7588443f2d2SAndrzej Pietrasiewicz if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE 7598443f2d2SAndrzej Pietrasiewicz || data->hs_desc.bDescriptorType 7608443f2d2SAndrzej Pietrasiewicz != USB_DT_ENDPOINT) { 7618443f2d2SAndrzej Pietrasiewicz DBG(data->dev, "config %s, bad hs length or type\n", 7628443f2d2SAndrzej Pietrasiewicz data->name); 7638443f2d2SAndrzej Pietrasiewicz goto fail0; 7648443f2d2SAndrzej Pietrasiewicz } 7658443f2d2SAndrzej Pietrasiewicz } 7668443f2d2SAndrzej Pietrasiewicz 7678443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&data->dev->lock); 7688443f2d2SAndrzej Pietrasiewicz if (data->dev->state == STATE_DEV_UNBOUND) { 7698443f2d2SAndrzej Pietrasiewicz value = -ENOENT; 7708443f2d2SAndrzej Pietrasiewicz goto gone; 7711ee7eeadSGreg Kroah-Hartman } else { 7721ee7eeadSGreg Kroah-Hartman ep = data->ep; 7731ee7eeadSGreg Kroah-Hartman if (ep == NULL) { 7748443f2d2SAndrzej Pietrasiewicz value = -ENODEV; 7758443f2d2SAndrzej Pietrasiewicz goto gone; 7768443f2d2SAndrzej Pietrasiewicz } 7771ee7eeadSGreg Kroah-Hartman } 7788443f2d2SAndrzej Pietrasiewicz switch (data->dev->gadget->speed) { 7798443f2d2SAndrzej Pietrasiewicz case USB_SPEED_LOW: 7808443f2d2SAndrzej Pietrasiewicz case USB_SPEED_FULL: 7818443f2d2SAndrzej Pietrasiewicz ep->desc = &data->desc; 7828443f2d2SAndrzej Pietrasiewicz break; 7838443f2d2SAndrzej Pietrasiewicz case USB_SPEED_HIGH: 7848443f2d2SAndrzej Pietrasiewicz /* fails if caller didn't provide that descriptor... */ 7858443f2d2SAndrzej Pietrasiewicz ep->desc = &data->hs_desc; 7868443f2d2SAndrzej Pietrasiewicz break; 7878443f2d2SAndrzej Pietrasiewicz default: 7888443f2d2SAndrzej Pietrasiewicz DBG(data->dev, "unconnected, %s init abandoned\n", 7898443f2d2SAndrzej Pietrasiewicz data->name); 7908443f2d2SAndrzej Pietrasiewicz value = -EINVAL; 791d4461a60SAl Viro goto gone; 7928443f2d2SAndrzej Pietrasiewicz } 793d4461a60SAl Viro value = usb_ep_enable(ep); 7948443f2d2SAndrzej Pietrasiewicz if (value == 0) { 795d4461a60SAl Viro data->state = STATE_EP_ENABLED; 7968443f2d2SAndrzej Pietrasiewicz value = length; 7978443f2d2SAndrzej Pietrasiewicz } 7988443f2d2SAndrzej Pietrasiewicz gone: 7998443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&data->dev->lock); 8008443f2d2SAndrzej Pietrasiewicz if (value < 0) { 8018443f2d2SAndrzej Pietrasiewicz fail: 8028443f2d2SAndrzej Pietrasiewicz data->desc.bDescriptorType = 0; 8038443f2d2SAndrzej Pietrasiewicz data->hs_desc.bDescriptorType = 0; 8048443f2d2SAndrzej Pietrasiewicz } 8058443f2d2SAndrzej Pietrasiewicz return value; 8068443f2d2SAndrzej Pietrasiewicz fail0: 8078443f2d2SAndrzej Pietrasiewicz value = -EINVAL; 8088443f2d2SAndrzej Pietrasiewicz goto fail; 8098443f2d2SAndrzej Pietrasiewicz } 8108443f2d2SAndrzej Pietrasiewicz 8118443f2d2SAndrzej Pietrasiewicz static int 8128443f2d2SAndrzej Pietrasiewicz ep_open (struct inode *inode, struct file *fd) 8138443f2d2SAndrzej Pietrasiewicz { 8148443f2d2SAndrzej Pietrasiewicz struct ep_data *data = inode->i_private; 8158443f2d2SAndrzej Pietrasiewicz int value = -EBUSY; 8168443f2d2SAndrzej Pietrasiewicz 8178443f2d2SAndrzej Pietrasiewicz if (mutex_lock_interruptible(&data->lock) != 0) 8188443f2d2SAndrzej Pietrasiewicz return -EINTR; 8198443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&data->dev->lock); 8208443f2d2SAndrzej Pietrasiewicz if (data->dev->state == STATE_DEV_UNBOUND) 8218443f2d2SAndrzej Pietrasiewicz value = -ENOENT; 8228443f2d2SAndrzej Pietrasiewicz else if (data->state == STATE_EP_DISABLED) { 8238443f2d2SAndrzej Pietrasiewicz value = 0; 8248443f2d2SAndrzej Pietrasiewicz data->state = STATE_EP_READY; 8258443f2d2SAndrzej Pietrasiewicz get_ep (data); 8268443f2d2SAndrzej Pietrasiewicz fd->private_data = data; 8278443f2d2SAndrzej Pietrasiewicz VDEBUG (data->dev, "%s ready\n", data->name); 8288443f2d2SAndrzej Pietrasiewicz } else 8298443f2d2SAndrzej Pietrasiewicz DBG (data->dev, "%s state %d\n", 8308443f2d2SAndrzej Pietrasiewicz data->name, data->state); 8318443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&data->dev->lock); 8328443f2d2SAndrzej Pietrasiewicz mutex_unlock(&data->lock); 8338443f2d2SAndrzej Pietrasiewicz return value; 8348443f2d2SAndrzej Pietrasiewicz } 8358443f2d2SAndrzej Pietrasiewicz 8368443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 8378443f2d2SAndrzej Pietrasiewicz 8388443f2d2SAndrzej Pietrasiewicz /* EP0 IMPLEMENTATION can be partly in userspace. 8398443f2d2SAndrzej Pietrasiewicz * 8408443f2d2SAndrzej Pietrasiewicz * Drivers that use this facility receive various events, including 8418443f2d2SAndrzej Pietrasiewicz * control requests the kernel doesn't handle. Drivers that don't 8428443f2d2SAndrzej Pietrasiewicz * use this facility may be too simple-minded for real applications. 8438443f2d2SAndrzej Pietrasiewicz */ 8448443f2d2SAndrzej Pietrasiewicz 8458443f2d2SAndrzej Pietrasiewicz static inline void ep0_readable (struct dev_data *dev) 8468443f2d2SAndrzej Pietrasiewicz { 8478443f2d2SAndrzej Pietrasiewicz wake_up (&dev->wait); 8488443f2d2SAndrzej Pietrasiewicz kill_fasync (&dev->fasync, SIGIO, POLL_IN); 8498443f2d2SAndrzej Pietrasiewicz } 8508443f2d2SAndrzej Pietrasiewicz 8518443f2d2SAndrzej Pietrasiewicz static void clean_req (struct usb_ep *ep, struct usb_request *req) 8528443f2d2SAndrzej Pietrasiewicz { 8538443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = ep->driver_data; 8548443f2d2SAndrzej Pietrasiewicz 8558443f2d2SAndrzej Pietrasiewicz if (req->buf != dev->rbuf) { 8568443f2d2SAndrzej Pietrasiewicz kfree(req->buf); 8578443f2d2SAndrzej Pietrasiewicz req->buf = dev->rbuf; 8588443f2d2SAndrzej Pietrasiewicz } 8598443f2d2SAndrzej Pietrasiewicz req->complete = epio_complete; 8608443f2d2SAndrzej Pietrasiewicz dev->setup_out_ready = 0; 8618443f2d2SAndrzej Pietrasiewicz } 8628443f2d2SAndrzej Pietrasiewicz 8638443f2d2SAndrzej Pietrasiewicz static void ep0_complete (struct usb_ep *ep, struct usb_request *req) 8648443f2d2SAndrzej Pietrasiewicz { 8658443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = ep->driver_data; 8668443f2d2SAndrzej Pietrasiewicz unsigned long flags; 8678443f2d2SAndrzej Pietrasiewicz int free = 1; 8688443f2d2SAndrzej Pietrasiewicz 8698443f2d2SAndrzej Pietrasiewicz /* for control OUT, data must still get to userspace */ 8708443f2d2SAndrzej Pietrasiewicz spin_lock_irqsave(&dev->lock, flags); 8718443f2d2SAndrzej Pietrasiewicz if (!dev->setup_in) { 8728443f2d2SAndrzej Pietrasiewicz dev->setup_out_error = (req->status != 0); 8738443f2d2SAndrzej Pietrasiewicz if (!dev->setup_out_error) 8748443f2d2SAndrzej Pietrasiewicz free = 0; 8758443f2d2SAndrzej Pietrasiewicz dev->setup_out_ready = 1; 8768443f2d2SAndrzej Pietrasiewicz ep0_readable (dev); 8778443f2d2SAndrzej Pietrasiewicz } 8788443f2d2SAndrzej Pietrasiewicz 8798443f2d2SAndrzej Pietrasiewicz /* clean up as appropriate */ 8808443f2d2SAndrzej Pietrasiewicz if (free && req->buf != &dev->rbuf) 8818443f2d2SAndrzej Pietrasiewicz clean_req (ep, req); 8828443f2d2SAndrzej Pietrasiewicz req->complete = epio_complete; 8838443f2d2SAndrzej Pietrasiewicz spin_unlock_irqrestore(&dev->lock, flags); 8848443f2d2SAndrzej Pietrasiewicz } 8858443f2d2SAndrzej Pietrasiewicz 8868443f2d2SAndrzej Pietrasiewicz static int setup_req (struct usb_ep *ep, struct usb_request *req, u16 len) 8878443f2d2SAndrzej Pietrasiewicz { 8888443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = ep->driver_data; 8898443f2d2SAndrzej Pietrasiewicz 8908443f2d2SAndrzej Pietrasiewicz if (dev->setup_out_ready) { 8918443f2d2SAndrzej Pietrasiewicz DBG (dev, "ep0 request busy!\n"); 8928443f2d2SAndrzej Pietrasiewicz return -EBUSY; 8938443f2d2SAndrzej Pietrasiewicz } 8948443f2d2SAndrzej Pietrasiewicz if (len > sizeof (dev->rbuf)) 8958443f2d2SAndrzej Pietrasiewicz req->buf = kmalloc(len, GFP_ATOMIC); 8968443f2d2SAndrzej Pietrasiewicz if (req->buf == NULL) { 8978443f2d2SAndrzej Pietrasiewicz req->buf = dev->rbuf; 8988443f2d2SAndrzej Pietrasiewicz return -ENOMEM; 8998443f2d2SAndrzej Pietrasiewicz } 9008443f2d2SAndrzej Pietrasiewicz req->complete = ep0_complete; 9018443f2d2SAndrzej Pietrasiewicz req->length = len; 9028443f2d2SAndrzej Pietrasiewicz req->zero = 0; 9038443f2d2SAndrzej Pietrasiewicz return 0; 9048443f2d2SAndrzej Pietrasiewicz } 9058443f2d2SAndrzej Pietrasiewicz 9068443f2d2SAndrzej Pietrasiewicz static ssize_t 9078443f2d2SAndrzej Pietrasiewicz ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) 9088443f2d2SAndrzej Pietrasiewicz { 9098443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 9108443f2d2SAndrzej Pietrasiewicz ssize_t retval; 9118443f2d2SAndrzej Pietrasiewicz enum ep0_state state; 9128443f2d2SAndrzej Pietrasiewicz 9138443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 91496b62a57SAlan Stern if (dev->state <= STATE_DEV_OPENED) { 91596b62a57SAlan Stern retval = -EINVAL; 91696b62a57SAlan Stern goto done; 91796b62a57SAlan Stern } 9188443f2d2SAndrzej Pietrasiewicz 9198443f2d2SAndrzej Pietrasiewicz /* report fd mode change before acting on it */ 9208443f2d2SAndrzej Pietrasiewicz if (dev->setup_abort) { 9218443f2d2SAndrzej Pietrasiewicz dev->setup_abort = 0; 9228443f2d2SAndrzej Pietrasiewicz retval = -EIDRM; 9238443f2d2SAndrzej Pietrasiewicz goto done; 9248443f2d2SAndrzej Pietrasiewicz } 9258443f2d2SAndrzej Pietrasiewicz 9268443f2d2SAndrzej Pietrasiewicz /* control DATA stage */ 9278443f2d2SAndrzej Pietrasiewicz if ((state = dev->state) == STATE_DEV_SETUP) { 9288443f2d2SAndrzej Pietrasiewicz 9298443f2d2SAndrzej Pietrasiewicz if (dev->setup_in) { /* stall IN */ 9308443f2d2SAndrzej Pietrasiewicz VDEBUG(dev, "ep0in stall\n"); 9318443f2d2SAndrzej Pietrasiewicz (void) usb_ep_set_halt (dev->gadget->ep0); 9328443f2d2SAndrzej Pietrasiewicz retval = -EL2HLT; 9338443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_CONNECTED; 9348443f2d2SAndrzej Pietrasiewicz 9358443f2d2SAndrzej Pietrasiewicz } else if (len == 0) { /* ack SET_CONFIGURATION etc */ 9368443f2d2SAndrzej Pietrasiewicz struct usb_ep *ep = dev->gadget->ep0; 9378443f2d2SAndrzej Pietrasiewicz struct usb_request *req = dev->req; 9388443f2d2SAndrzej Pietrasiewicz 939d246dcb2SBin Liu if ((retval = setup_req (ep, req, 0)) == 0) { 940520b72fcSAlan Stern ++dev->udc_usage; 941d246dcb2SBin Liu spin_unlock_irq (&dev->lock); 942d246dcb2SBin Liu retval = usb_ep_queue (ep, req, GFP_KERNEL); 943d246dcb2SBin Liu spin_lock_irq (&dev->lock); 944520b72fcSAlan Stern --dev->udc_usage; 945d246dcb2SBin Liu } 9468443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_CONNECTED; 9478443f2d2SAndrzej Pietrasiewicz 9488443f2d2SAndrzej Pietrasiewicz /* assume that was SET_CONFIGURATION */ 9498443f2d2SAndrzej Pietrasiewicz if (dev->current_config) { 9508443f2d2SAndrzej Pietrasiewicz unsigned power; 9518443f2d2SAndrzej Pietrasiewicz 9528443f2d2SAndrzej Pietrasiewicz if (gadget_is_dualspeed(dev->gadget) 9538443f2d2SAndrzej Pietrasiewicz && (dev->gadget->speed 9548443f2d2SAndrzej Pietrasiewicz == USB_SPEED_HIGH)) 9558443f2d2SAndrzej Pietrasiewicz power = dev->hs_config->bMaxPower; 9568443f2d2SAndrzej Pietrasiewicz else 9578443f2d2SAndrzej Pietrasiewicz power = dev->config->bMaxPower; 9588443f2d2SAndrzej Pietrasiewicz usb_gadget_vbus_draw(dev->gadget, 2 * power); 9598443f2d2SAndrzej Pietrasiewicz } 9608443f2d2SAndrzej Pietrasiewicz 9618443f2d2SAndrzej Pietrasiewicz } else { /* collect OUT data */ 9628443f2d2SAndrzej Pietrasiewicz if ((fd->f_flags & O_NONBLOCK) != 0 9638443f2d2SAndrzej Pietrasiewicz && !dev->setup_out_ready) { 9648443f2d2SAndrzej Pietrasiewicz retval = -EAGAIN; 9658443f2d2SAndrzej Pietrasiewicz goto done; 9668443f2d2SAndrzej Pietrasiewicz } 9678443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 9688443f2d2SAndrzej Pietrasiewicz retval = wait_event_interruptible (dev->wait, 9698443f2d2SAndrzej Pietrasiewicz dev->setup_out_ready != 0); 9708443f2d2SAndrzej Pietrasiewicz 9718443f2d2SAndrzej Pietrasiewicz /* FIXME state could change from under us */ 9728443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 9738443f2d2SAndrzej Pietrasiewicz if (retval) 9748443f2d2SAndrzej Pietrasiewicz goto done; 9758443f2d2SAndrzej Pietrasiewicz 9768443f2d2SAndrzej Pietrasiewicz if (dev->state != STATE_DEV_SETUP) { 9778443f2d2SAndrzej Pietrasiewicz retval = -ECANCELED; 9788443f2d2SAndrzej Pietrasiewicz goto done; 9798443f2d2SAndrzej Pietrasiewicz } 9808443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_CONNECTED; 9818443f2d2SAndrzej Pietrasiewicz 9828443f2d2SAndrzej Pietrasiewicz if (dev->setup_out_error) 9838443f2d2SAndrzej Pietrasiewicz retval = -EIO; 9848443f2d2SAndrzej Pietrasiewicz else { 9858443f2d2SAndrzej Pietrasiewicz len = min (len, (size_t)dev->req->actual); 9866e76c01eSAlan Stern ++dev->udc_usage; 9876e76c01eSAlan Stern spin_unlock_irq(&dev->lock); 9888443f2d2SAndrzej Pietrasiewicz if (copy_to_user (buf, dev->req->buf, len)) 9898443f2d2SAndrzej Pietrasiewicz retval = -EFAULT; 9908443f2d2SAndrzej Pietrasiewicz else 9918443f2d2SAndrzej Pietrasiewicz retval = len; 9926e76c01eSAlan Stern spin_lock_irq(&dev->lock); 9936e76c01eSAlan Stern --dev->udc_usage; 9948443f2d2SAndrzej Pietrasiewicz clean_req (dev->gadget->ep0, dev->req); 9958443f2d2SAndrzej Pietrasiewicz /* NOTE userspace can't yet choose to stall */ 9968443f2d2SAndrzej Pietrasiewicz } 9978443f2d2SAndrzej Pietrasiewicz } 9988443f2d2SAndrzej Pietrasiewicz goto done; 9998443f2d2SAndrzej Pietrasiewicz } 10008443f2d2SAndrzej Pietrasiewicz 10018443f2d2SAndrzej Pietrasiewicz /* else normal: return event data */ 10028443f2d2SAndrzej Pietrasiewicz if (len < sizeof dev->event [0]) { 10038443f2d2SAndrzej Pietrasiewicz retval = -EINVAL; 10048443f2d2SAndrzej Pietrasiewicz goto done; 10058443f2d2SAndrzej Pietrasiewicz } 10068443f2d2SAndrzej Pietrasiewicz len -= len % sizeof (struct usb_gadgetfs_event); 10078443f2d2SAndrzej Pietrasiewicz dev->usermode_setup = 1; 10088443f2d2SAndrzej Pietrasiewicz 10098443f2d2SAndrzej Pietrasiewicz scan: 10108443f2d2SAndrzej Pietrasiewicz /* return queued events right away */ 10118443f2d2SAndrzej Pietrasiewicz if (dev->ev_next != 0) { 10128443f2d2SAndrzej Pietrasiewicz unsigned i, n; 10138443f2d2SAndrzej Pietrasiewicz 10148443f2d2SAndrzej Pietrasiewicz n = len / sizeof (struct usb_gadgetfs_event); 10158443f2d2SAndrzej Pietrasiewicz if (dev->ev_next < n) 10168443f2d2SAndrzej Pietrasiewicz n = dev->ev_next; 10178443f2d2SAndrzej Pietrasiewicz 10188443f2d2SAndrzej Pietrasiewicz /* ep0 i/o has special semantics during STATE_DEV_SETUP */ 10198443f2d2SAndrzej Pietrasiewicz for (i = 0; i < n; i++) { 10208443f2d2SAndrzej Pietrasiewicz if (dev->event [i].type == GADGETFS_SETUP) { 10218443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_SETUP; 10228443f2d2SAndrzej Pietrasiewicz n = i + 1; 10238443f2d2SAndrzej Pietrasiewicz break; 10248443f2d2SAndrzej Pietrasiewicz } 10258443f2d2SAndrzej Pietrasiewicz } 10268443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 10278443f2d2SAndrzej Pietrasiewicz len = n * sizeof (struct usb_gadgetfs_event); 10288443f2d2SAndrzej Pietrasiewicz if (copy_to_user (buf, &dev->event, len)) 10298443f2d2SAndrzej Pietrasiewicz retval = -EFAULT; 10308443f2d2SAndrzej Pietrasiewicz else 10318443f2d2SAndrzej Pietrasiewicz retval = len; 10328443f2d2SAndrzej Pietrasiewicz if (len > 0) { 10338443f2d2SAndrzej Pietrasiewicz /* NOTE this doesn't guard against broken drivers; 10348443f2d2SAndrzej Pietrasiewicz * concurrent ep0 readers may lose events. 10358443f2d2SAndrzej Pietrasiewicz */ 10368443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 10378443f2d2SAndrzej Pietrasiewicz if (dev->ev_next > n) { 10388443f2d2SAndrzej Pietrasiewicz memmove(&dev->event[0], &dev->event[n], 10398443f2d2SAndrzej Pietrasiewicz sizeof (struct usb_gadgetfs_event) 10408443f2d2SAndrzej Pietrasiewicz * (dev->ev_next - n)); 10418443f2d2SAndrzej Pietrasiewicz } 10428443f2d2SAndrzej Pietrasiewicz dev->ev_next -= n; 10438443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 10448443f2d2SAndrzej Pietrasiewicz } 10458443f2d2SAndrzej Pietrasiewicz return retval; 10468443f2d2SAndrzej Pietrasiewicz } 10478443f2d2SAndrzej Pietrasiewicz if (fd->f_flags & O_NONBLOCK) { 10488443f2d2SAndrzej Pietrasiewicz retval = -EAGAIN; 10498443f2d2SAndrzej Pietrasiewicz goto done; 10508443f2d2SAndrzej Pietrasiewicz } 10518443f2d2SAndrzej Pietrasiewicz 10528443f2d2SAndrzej Pietrasiewicz switch (state) { 10538443f2d2SAndrzej Pietrasiewicz default: 10548443f2d2SAndrzej Pietrasiewicz DBG (dev, "fail %s, state %d\n", __func__, state); 10558443f2d2SAndrzej Pietrasiewicz retval = -ESRCH; 10568443f2d2SAndrzej Pietrasiewicz break; 10578443f2d2SAndrzej Pietrasiewicz case STATE_DEV_UNCONNECTED: 10588443f2d2SAndrzej Pietrasiewicz case STATE_DEV_CONNECTED: 10598443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 10608443f2d2SAndrzej Pietrasiewicz DBG (dev, "%s wait\n", __func__); 10618443f2d2SAndrzej Pietrasiewicz 10628443f2d2SAndrzej Pietrasiewicz /* wait for events */ 10638443f2d2SAndrzej Pietrasiewicz retval = wait_event_interruptible (dev->wait, 10648443f2d2SAndrzej Pietrasiewicz dev->ev_next != 0); 10658443f2d2SAndrzej Pietrasiewicz if (retval < 0) 10668443f2d2SAndrzej Pietrasiewicz return retval; 10678443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 10688443f2d2SAndrzej Pietrasiewicz goto scan; 10698443f2d2SAndrzej Pietrasiewicz } 10708443f2d2SAndrzej Pietrasiewicz 10718443f2d2SAndrzej Pietrasiewicz done: 10728443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 10738443f2d2SAndrzej Pietrasiewicz return retval; 10748443f2d2SAndrzej Pietrasiewicz } 10758443f2d2SAndrzej Pietrasiewicz 10768443f2d2SAndrzej Pietrasiewicz static struct usb_gadgetfs_event * 10778443f2d2SAndrzej Pietrasiewicz next_event (struct dev_data *dev, enum usb_gadgetfs_event_type type) 10788443f2d2SAndrzej Pietrasiewicz { 10798443f2d2SAndrzej Pietrasiewicz struct usb_gadgetfs_event *event; 10808443f2d2SAndrzej Pietrasiewicz unsigned i; 10818443f2d2SAndrzej Pietrasiewicz 10828443f2d2SAndrzej Pietrasiewicz switch (type) { 10838443f2d2SAndrzej Pietrasiewicz /* these events purge the queue */ 10848443f2d2SAndrzej Pietrasiewicz case GADGETFS_DISCONNECT: 10858443f2d2SAndrzej Pietrasiewicz if (dev->state == STATE_DEV_SETUP) 10868443f2d2SAndrzej Pietrasiewicz dev->setup_abort = 1; 10878443f2d2SAndrzej Pietrasiewicz // FALL THROUGH 10888443f2d2SAndrzej Pietrasiewicz case GADGETFS_CONNECT: 10898443f2d2SAndrzej Pietrasiewicz dev->ev_next = 0; 10908443f2d2SAndrzej Pietrasiewicz break; 10918443f2d2SAndrzej Pietrasiewicz case GADGETFS_SETUP: /* previous request timed out */ 10928443f2d2SAndrzej Pietrasiewicz case GADGETFS_SUSPEND: /* same effect */ 10938443f2d2SAndrzej Pietrasiewicz /* these events can't be repeated */ 10948443f2d2SAndrzej Pietrasiewicz for (i = 0; i != dev->ev_next; i++) { 10958443f2d2SAndrzej Pietrasiewicz if (dev->event [i].type != type) 10968443f2d2SAndrzej Pietrasiewicz continue; 10978443f2d2SAndrzej Pietrasiewicz DBG(dev, "discard old event[%d] %d\n", i, type); 10988443f2d2SAndrzej Pietrasiewicz dev->ev_next--; 10998443f2d2SAndrzej Pietrasiewicz if (i == dev->ev_next) 11008443f2d2SAndrzej Pietrasiewicz break; 11018443f2d2SAndrzej Pietrasiewicz /* indices start at zero, for simplicity */ 11028443f2d2SAndrzej Pietrasiewicz memmove (&dev->event [i], &dev->event [i + 1], 11038443f2d2SAndrzej Pietrasiewicz sizeof (struct usb_gadgetfs_event) 11048443f2d2SAndrzej Pietrasiewicz * (dev->ev_next - i)); 11058443f2d2SAndrzej Pietrasiewicz } 11068443f2d2SAndrzej Pietrasiewicz break; 11078443f2d2SAndrzej Pietrasiewicz default: 11088443f2d2SAndrzej Pietrasiewicz BUG (); 11098443f2d2SAndrzej Pietrasiewicz } 11108443f2d2SAndrzej Pietrasiewicz VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type); 11118443f2d2SAndrzej Pietrasiewicz event = &dev->event [dev->ev_next++]; 11128443f2d2SAndrzej Pietrasiewicz BUG_ON (dev->ev_next > N_EVENT); 11138443f2d2SAndrzej Pietrasiewicz memset (event, 0, sizeof *event); 11148443f2d2SAndrzej Pietrasiewicz event->type = type; 11158443f2d2SAndrzej Pietrasiewicz return event; 11168443f2d2SAndrzej Pietrasiewicz } 11178443f2d2SAndrzej Pietrasiewicz 11188443f2d2SAndrzej Pietrasiewicz static ssize_t 11198443f2d2SAndrzej Pietrasiewicz ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) 11208443f2d2SAndrzej Pietrasiewicz { 11218443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 11228443f2d2SAndrzej Pietrasiewicz ssize_t retval = -ESRCH; 11238443f2d2SAndrzej Pietrasiewicz 11248443f2d2SAndrzej Pietrasiewicz /* report fd mode change before acting on it */ 11258443f2d2SAndrzej Pietrasiewicz if (dev->setup_abort) { 11268443f2d2SAndrzej Pietrasiewicz dev->setup_abort = 0; 11278443f2d2SAndrzej Pietrasiewicz retval = -EIDRM; 11288443f2d2SAndrzej Pietrasiewicz 11298443f2d2SAndrzej Pietrasiewicz /* data and/or status stage for control request */ 11308443f2d2SAndrzej Pietrasiewicz } else if (dev->state == STATE_DEV_SETUP) { 11318443f2d2SAndrzej Pietrasiewicz 1132faab5098SAlan Stern len = min_t(size_t, len, dev->setup_wLength); 11338443f2d2SAndrzej Pietrasiewicz if (dev->setup_in) { 11348443f2d2SAndrzej Pietrasiewicz retval = setup_req (dev->gadget->ep0, dev->req, len); 11358443f2d2SAndrzej Pietrasiewicz if (retval == 0) { 11368443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_CONNECTED; 1137520b72fcSAlan Stern ++dev->udc_usage; 11388443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 11398443f2d2SAndrzej Pietrasiewicz if (copy_from_user (dev->req->buf, buf, len)) 11408443f2d2SAndrzej Pietrasiewicz retval = -EFAULT; 11418443f2d2SAndrzej Pietrasiewicz else { 11428443f2d2SAndrzej Pietrasiewicz if (len < dev->setup_wLength) 11438443f2d2SAndrzej Pietrasiewicz dev->req->zero = 1; 11448443f2d2SAndrzej Pietrasiewicz retval = usb_ep_queue ( 11458443f2d2SAndrzej Pietrasiewicz dev->gadget->ep0, dev->req, 11468443f2d2SAndrzej Pietrasiewicz GFP_KERNEL); 11478443f2d2SAndrzej Pietrasiewicz } 11488443f2d2SAndrzej Pietrasiewicz spin_lock_irq(&dev->lock); 1149520b72fcSAlan Stern --dev->udc_usage; 1150b7bd98b7SDavid Eccher if (retval < 0) { 11518443f2d2SAndrzej Pietrasiewicz clean_req (dev->gadget->ep0, dev->req); 11528443f2d2SAndrzej Pietrasiewicz } else 11538443f2d2SAndrzej Pietrasiewicz retval = len; 11548443f2d2SAndrzej Pietrasiewicz 11558443f2d2SAndrzej Pietrasiewicz return retval; 11568443f2d2SAndrzej Pietrasiewicz } 11578443f2d2SAndrzej Pietrasiewicz 11588443f2d2SAndrzej Pietrasiewicz /* can stall some OUT transfers */ 11598443f2d2SAndrzej Pietrasiewicz } else if (dev->setup_can_stall) { 11608443f2d2SAndrzej Pietrasiewicz VDEBUG(dev, "ep0out stall\n"); 11618443f2d2SAndrzej Pietrasiewicz (void) usb_ep_set_halt (dev->gadget->ep0); 11628443f2d2SAndrzej Pietrasiewicz retval = -EL2HLT; 11638443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_CONNECTED; 11648443f2d2SAndrzej Pietrasiewicz } else { 11658443f2d2SAndrzej Pietrasiewicz DBG(dev, "bogus ep0out stall!\n"); 11668443f2d2SAndrzej Pietrasiewicz } 11678443f2d2SAndrzej Pietrasiewicz } else 11688443f2d2SAndrzej Pietrasiewicz DBG (dev, "fail %s, state %d\n", __func__, dev->state); 11698443f2d2SAndrzej Pietrasiewicz 11708443f2d2SAndrzej Pietrasiewicz return retval; 11718443f2d2SAndrzej Pietrasiewicz } 11728443f2d2SAndrzej Pietrasiewicz 11738443f2d2SAndrzej Pietrasiewicz static int 11748443f2d2SAndrzej Pietrasiewicz ep0_fasync (int f, struct file *fd, int on) 11758443f2d2SAndrzej Pietrasiewicz { 11768443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 11778443f2d2SAndrzej Pietrasiewicz // caller must F_SETOWN before signal delivery happens 11788443f2d2SAndrzej Pietrasiewicz VDEBUG (dev, "%s %s\n", __func__, on ? "on" : "off"); 11798443f2d2SAndrzej Pietrasiewicz return fasync_helper (f, fd, on, &dev->fasync); 11808443f2d2SAndrzej Pietrasiewicz } 11818443f2d2SAndrzej Pietrasiewicz 11828443f2d2SAndrzej Pietrasiewicz static struct usb_gadget_driver gadgetfs_driver; 11838443f2d2SAndrzej Pietrasiewicz 11848443f2d2SAndrzej Pietrasiewicz static int 11858443f2d2SAndrzej Pietrasiewicz dev_release (struct inode *inode, struct file *fd) 11868443f2d2SAndrzej Pietrasiewicz { 11878443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 11888443f2d2SAndrzej Pietrasiewicz 11898443f2d2SAndrzej Pietrasiewicz /* closing ep0 === shutdown all */ 11908443f2d2SAndrzej Pietrasiewicz 1191f50b878fSAlan Stern if (dev->gadget_registered) { 11928443f2d2SAndrzej Pietrasiewicz usb_gadget_unregister_driver (&gadgetfs_driver); 1193f50b878fSAlan Stern dev->gadget_registered = false; 1194f50b878fSAlan Stern } 11958443f2d2SAndrzej Pietrasiewicz 11968443f2d2SAndrzej Pietrasiewicz /* at this point "good" hardware has disconnected the 11978443f2d2SAndrzej Pietrasiewicz * device from USB; the host won't see it any more. 11988443f2d2SAndrzej Pietrasiewicz * alternatively, all host requests will time out. 11998443f2d2SAndrzej Pietrasiewicz */ 12008443f2d2SAndrzej Pietrasiewicz 12018443f2d2SAndrzej Pietrasiewicz kfree (dev->buf); 12028443f2d2SAndrzej Pietrasiewicz dev->buf = NULL; 12038443f2d2SAndrzej Pietrasiewicz 120461fe2d75SGreg Kroah-Hartman /* other endpoints were all decoupled from this device */ 120561fe2d75SGreg Kroah-Hartman spin_lock_irq(&dev->lock); 120661fe2d75SGreg Kroah-Hartman dev->state = STATE_DEV_DISABLED; 120761fe2d75SGreg Kroah-Hartman spin_unlock_irq(&dev->lock); 120861fe2d75SGreg Kroah-Hartman 120961fe2d75SGreg Kroah-Hartman put_dev (dev); 12108443f2d2SAndrzej Pietrasiewicz return 0; 12118443f2d2SAndrzej Pietrasiewicz } 12128443f2d2SAndrzej Pietrasiewicz 1213afc9a42bSAl Viro static __poll_t 12148443f2d2SAndrzej Pietrasiewicz ep0_poll (struct file *fd, poll_table *wait) 12158443f2d2SAndrzej Pietrasiewicz { 12168443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 1217afc9a42bSAl Viro __poll_t mask = 0; 12188443f2d2SAndrzej Pietrasiewicz 121996b62a57SAlan Stern if (dev->state <= STATE_DEV_OPENED) 122096b62a57SAlan Stern return DEFAULT_POLLMASK; 122196b62a57SAlan Stern 12228443f2d2SAndrzej Pietrasiewicz poll_wait(fd, &dev->wait, wait); 12238443f2d2SAndrzej Pietrasiewicz 12248443f2d2SAndrzej Pietrasiewicz spin_lock_irq(&dev->lock); 12258443f2d2SAndrzej Pietrasiewicz 12268443f2d2SAndrzej Pietrasiewicz /* report fd mode change before acting on it */ 12278443f2d2SAndrzej Pietrasiewicz if (dev->setup_abort) { 12288443f2d2SAndrzej Pietrasiewicz dev->setup_abort = 0; 1229a9a08845SLinus Torvalds mask = EPOLLHUP; 12308443f2d2SAndrzej Pietrasiewicz goto out; 12318443f2d2SAndrzej Pietrasiewicz } 12328443f2d2SAndrzej Pietrasiewicz 12338443f2d2SAndrzej Pietrasiewicz if (dev->state == STATE_DEV_SETUP) { 12348443f2d2SAndrzej Pietrasiewicz if (dev->setup_in || dev->setup_can_stall) 1235a9a08845SLinus Torvalds mask = EPOLLOUT; 12368443f2d2SAndrzej Pietrasiewicz } else { 12378443f2d2SAndrzej Pietrasiewicz if (dev->ev_next != 0) 1238a9a08845SLinus Torvalds mask = EPOLLIN; 12398443f2d2SAndrzej Pietrasiewicz } 12408443f2d2SAndrzej Pietrasiewicz out: 12418443f2d2SAndrzej Pietrasiewicz spin_unlock_irq(&dev->lock); 12428443f2d2SAndrzej Pietrasiewicz return mask; 12438443f2d2SAndrzej Pietrasiewicz } 12448443f2d2SAndrzej Pietrasiewicz 12458443f2d2SAndrzej Pietrasiewicz static long dev_ioctl (struct file *fd, unsigned code, unsigned long value) 12468443f2d2SAndrzej Pietrasiewicz { 12478443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 12488443f2d2SAndrzej Pietrasiewicz struct usb_gadget *gadget = dev->gadget; 12498443f2d2SAndrzej Pietrasiewicz long ret = -ENOTTY; 12508443f2d2SAndrzej Pietrasiewicz 1251520b72fcSAlan Stern spin_lock_irq(&dev->lock); 1252520b72fcSAlan Stern if (dev->state == STATE_DEV_OPENED || 1253520b72fcSAlan Stern dev->state == STATE_DEV_UNBOUND) { 1254520b72fcSAlan Stern /* Not bound to a UDC */ 1255520b72fcSAlan Stern } else if (gadget->ops->ioctl) { 1256520b72fcSAlan Stern ++dev->udc_usage; 1257520b72fcSAlan Stern spin_unlock_irq(&dev->lock); 1258520b72fcSAlan Stern 12598443f2d2SAndrzej Pietrasiewicz ret = gadget->ops->ioctl (gadget, code, value); 12608443f2d2SAndrzej Pietrasiewicz 1261520b72fcSAlan Stern spin_lock_irq(&dev->lock); 1262520b72fcSAlan Stern --dev->udc_usage; 1263520b72fcSAlan Stern } 1264520b72fcSAlan Stern spin_unlock_irq(&dev->lock); 1265520b72fcSAlan Stern 12668443f2d2SAndrzej Pietrasiewicz return ret; 12678443f2d2SAndrzej Pietrasiewicz } 12688443f2d2SAndrzej Pietrasiewicz 12698443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 12708443f2d2SAndrzej Pietrasiewicz 12718443f2d2SAndrzej Pietrasiewicz /* The in-kernel gadget driver handles most ep0 issues, in particular 12728443f2d2SAndrzej Pietrasiewicz * enumerating the single configuration (as provided from user space). 12738443f2d2SAndrzej Pietrasiewicz * 12748443f2d2SAndrzej Pietrasiewicz * Unrecognized ep0 requests may be handled in user space. 12758443f2d2SAndrzej Pietrasiewicz */ 12768443f2d2SAndrzej Pietrasiewicz 12778443f2d2SAndrzej Pietrasiewicz static void make_qualifier (struct dev_data *dev) 12788443f2d2SAndrzej Pietrasiewicz { 12798443f2d2SAndrzej Pietrasiewicz struct usb_qualifier_descriptor qual; 12808443f2d2SAndrzej Pietrasiewicz struct usb_device_descriptor *desc; 12818443f2d2SAndrzej Pietrasiewicz 12828443f2d2SAndrzej Pietrasiewicz qual.bLength = sizeof qual; 12838443f2d2SAndrzej Pietrasiewicz qual.bDescriptorType = USB_DT_DEVICE_QUALIFIER; 12848443f2d2SAndrzej Pietrasiewicz qual.bcdUSB = cpu_to_le16 (0x0200); 12858443f2d2SAndrzej Pietrasiewicz 12868443f2d2SAndrzej Pietrasiewicz desc = dev->dev; 12878443f2d2SAndrzej Pietrasiewicz qual.bDeviceClass = desc->bDeviceClass; 12888443f2d2SAndrzej Pietrasiewicz qual.bDeviceSubClass = desc->bDeviceSubClass; 12898443f2d2SAndrzej Pietrasiewicz qual.bDeviceProtocol = desc->bDeviceProtocol; 12908443f2d2SAndrzej Pietrasiewicz 12918443f2d2SAndrzej Pietrasiewicz /* assumes ep0 uses the same value for both speeds ... */ 12928443f2d2SAndrzej Pietrasiewicz qual.bMaxPacketSize0 = dev->gadget->ep0->maxpacket; 12938443f2d2SAndrzej Pietrasiewicz 12948443f2d2SAndrzej Pietrasiewicz qual.bNumConfigurations = 1; 12958443f2d2SAndrzej Pietrasiewicz qual.bRESERVED = 0; 12968443f2d2SAndrzej Pietrasiewicz 12978443f2d2SAndrzej Pietrasiewicz memcpy (dev->rbuf, &qual, sizeof qual); 12988443f2d2SAndrzej Pietrasiewicz } 12998443f2d2SAndrzej Pietrasiewicz 13008443f2d2SAndrzej Pietrasiewicz static int 13018443f2d2SAndrzej Pietrasiewicz config_buf (struct dev_data *dev, u8 type, unsigned index) 13028443f2d2SAndrzej Pietrasiewicz { 13038443f2d2SAndrzej Pietrasiewicz int len; 13048443f2d2SAndrzej Pietrasiewicz int hs = 0; 13058443f2d2SAndrzej Pietrasiewicz 13068443f2d2SAndrzej Pietrasiewicz /* only one configuration */ 13078443f2d2SAndrzej Pietrasiewicz if (index > 0) 13088443f2d2SAndrzej Pietrasiewicz return -EINVAL; 13098443f2d2SAndrzej Pietrasiewicz 13108443f2d2SAndrzej Pietrasiewicz if (gadget_is_dualspeed(dev->gadget)) { 13118443f2d2SAndrzej Pietrasiewicz hs = (dev->gadget->speed == USB_SPEED_HIGH); 13128443f2d2SAndrzej Pietrasiewicz if (type == USB_DT_OTHER_SPEED_CONFIG) 13138443f2d2SAndrzej Pietrasiewicz hs = !hs; 13148443f2d2SAndrzej Pietrasiewicz } 13158443f2d2SAndrzej Pietrasiewicz if (hs) { 13168443f2d2SAndrzej Pietrasiewicz dev->req->buf = dev->hs_config; 13178443f2d2SAndrzej Pietrasiewicz len = le16_to_cpu(dev->hs_config->wTotalLength); 13188443f2d2SAndrzej Pietrasiewicz } else { 13198443f2d2SAndrzej Pietrasiewicz dev->req->buf = dev->config; 13208443f2d2SAndrzej Pietrasiewicz len = le16_to_cpu(dev->config->wTotalLength); 13218443f2d2SAndrzej Pietrasiewicz } 13228443f2d2SAndrzej Pietrasiewicz ((u8 *)dev->req->buf) [1] = type; 13238443f2d2SAndrzej Pietrasiewicz return len; 13248443f2d2SAndrzej Pietrasiewicz } 13258443f2d2SAndrzej Pietrasiewicz 13268443f2d2SAndrzej Pietrasiewicz static int 13278443f2d2SAndrzej Pietrasiewicz gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 13288443f2d2SAndrzej Pietrasiewicz { 13298443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = get_gadget_data (gadget); 13308443f2d2SAndrzej Pietrasiewicz struct usb_request *req = dev->req; 13318443f2d2SAndrzej Pietrasiewicz int value = -EOPNOTSUPP; 13328443f2d2SAndrzej Pietrasiewicz struct usb_gadgetfs_event *event; 13338443f2d2SAndrzej Pietrasiewicz u16 w_value = le16_to_cpu(ctrl->wValue); 13348443f2d2SAndrzej Pietrasiewicz u16 w_length = le16_to_cpu(ctrl->wLength); 13358443f2d2SAndrzej Pietrasiewicz 13368443f2d2SAndrzej Pietrasiewicz spin_lock (&dev->lock); 13378443f2d2SAndrzej Pietrasiewicz dev->setup_abort = 0; 13388443f2d2SAndrzej Pietrasiewicz if (dev->state == STATE_DEV_UNCONNECTED) { 13398443f2d2SAndrzej Pietrasiewicz if (gadget_is_dualspeed(gadget) 13408443f2d2SAndrzej Pietrasiewicz && gadget->speed == USB_SPEED_HIGH 13418443f2d2SAndrzej Pietrasiewicz && dev->hs_config == NULL) { 13428443f2d2SAndrzej Pietrasiewicz spin_unlock(&dev->lock); 13438443f2d2SAndrzej Pietrasiewicz ERROR (dev, "no high speed config??\n"); 13448443f2d2SAndrzej Pietrasiewicz return -EINVAL; 13458443f2d2SAndrzej Pietrasiewicz } 13468443f2d2SAndrzej Pietrasiewicz 13478443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_CONNECTED; 13488443f2d2SAndrzej Pietrasiewicz 13498443f2d2SAndrzej Pietrasiewicz INFO (dev, "connected\n"); 13508443f2d2SAndrzej Pietrasiewicz event = next_event (dev, GADGETFS_CONNECT); 13518443f2d2SAndrzej Pietrasiewicz event->u.speed = gadget->speed; 13528443f2d2SAndrzej Pietrasiewicz ep0_readable (dev); 13538443f2d2SAndrzej Pietrasiewicz 13548443f2d2SAndrzej Pietrasiewicz /* host may have given up waiting for response. we can miss control 13558443f2d2SAndrzej Pietrasiewicz * requests handled lower down (device/endpoint status and features); 13568443f2d2SAndrzej Pietrasiewicz * then ep0_{read,write} will report the wrong status. controller 13578443f2d2SAndrzej Pietrasiewicz * driver will have aborted pending i/o. 13588443f2d2SAndrzej Pietrasiewicz */ 13598443f2d2SAndrzej Pietrasiewicz } else if (dev->state == STATE_DEV_SETUP) 13608443f2d2SAndrzej Pietrasiewicz dev->setup_abort = 1; 13618443f2d2SAndrzej Pietrasiewicz 13628443f2d2SAndrzej Pietrasiewicz req->buf = dev->rbuf; 13638443f2d2SAndrzej Pietrasiewicz req->context = NULL; 13648443f2d2SAndrzej Pietrasiewicz value = -EOPNOTSUPP; 13658443f2d2SAndrzej Pietrasiewicz switch (ctrl->bRequest) { 13668443f2d2SAndrzej Pietrasiewicz 13678443f2d2SAndrzej Pietrasiewicz case USB_REQ_GET_DESCRIPTOR: 13688443f2d2SAndrzej Pietrasiewicz if (ctrl->bRequestType != USB_DIR_IN) 13698443f2d2SAndrzej Pietrasiewicz goto unrecognized; 13708443f2d2SAndrzej Pietrasiewicz switch (w_value >> 8) { 13718443f2d2SAndrzej Pietrasiewicz 13728443f2d2SAndrzej Pietrasiewicz case USB_DT_DEVICE: 13738443f2d2SAndrzej Pietrasiewicz value = min (w_length, (u16) sizeof *dev->dev); 13748443f2d2SAndrzej Pietrasiewicz dev->dev->bMaxPacketSize0 = dev->gadget->ep0->maxpacket; 13758443f2d2SAndrzej Pietrasiewicz req->buf = dev->dev; 13768443f2d2SAndrzej Pietrasiewicz break; 13778443f2d2SAndrzej Pietrasiewicz case USB_DT_DEVICE_QUALIFIER: 13788443f2d2SAndrzej Pietrasiewicz if (!dev->hs_config) 13798443f2d2SAndrzej Pietrasiewicz break; 13808443f2d2SAndrzej Pietrasiewicz value = min (w_length, (u16) 13818443f2d2SAndrzej Pietrasiewicz sizeof (struct usb_qualifier_descriptor)); 13828443f2d2SAndrzej Pietrasiewicz make_qualifier (dev); 13838443f2d2SAndrzej Pietrasiewicz break; 13848443f2d2SAndrzej Pietrasiewicz case USB_DT_OTHER_SPEED_CONFIG: 13858443f2d2SAndrzej Pietrasiewicz // FALLTHROUGH 13868443f2d2SAndrzej Pietrasiewicz case USB_DT_CONFIG: 13878443f2d2SAndrzej Pietrasiewicz value = config_buf (dev, 13888443f2d2SAndrzej Pietrasiewicz w_value >> 8, 13898443f2d2SAndrzej Pietrasiewicz w_value & 0xff); 13908443f2d2SAndrzej Pietrasiewicz if (value >= 0) 13918443f2d2SAndrzej Pietrasiewicz value = min (w_length, (u16) value); 13928443f2d2SAndrzej Pietrasiewicz break; 13938443f2d2SAndrzej Pietrasiewicz case USB_DT_STRING: 13948443f2d2SAndrzej Pietrasiewicz goto unrecognized; 13958443f2d2SAndrzej Pietrasiewicz 13968443f2d2SAndrzej Pietrasiewicz default: // all others are errors 13978443f2d2SAndrzej Pietrasiewicz break; 13988443f2d2SAndrzej Pietrasiewicz } 13998443f2d2SAndrzej Pietrasiewicz break; 14008443f2d2SAndrzej Pietrasiewicz 14018443f2d2SAndrzej Pietrasiewicz /* currently one config, two speeds */ 14028443f2d2SAndrzej Pietrasiewicz case USB_REQ_SET_CONFIGURATION: 14038443f2d2SAndrzej Pietrasiewicz if (ctrl->bRequestType != 0) 14048443f2d2SAndrzej Pietrasiewicz goto unrecognized; 14058443f2d2SAndrzej Pietrasiewicz if (0 == (u8) w_value) { 14068443f2d2SAndrzej Pietrasiewicz value = 0; 14078443f2d2SAndrzej Pietrasiewicz dev->current_config = 0; 14088443f2d2SAndrzej Pietrasiewicz usb_gadget_vbus_draw(gadget, 8 /* mA */ ); 14098443f2d2SAndrzej Pietrasiewicz // user mode expected to disable endpoints 14108443f2d2SAndrzej Pietrasiewicz } else { 14118443f2d2SAndrzej Pietrasiewicz u8 config, power; 14128443f2d2SAndrzej Pietrasiewicz 14138443f2d2SAndrzej Pietrasiewicz if (gadget_is_dualspeed(gadget) 14148443f2d2SAndrzej Pietrasiewicz && gadget->speed == USB_SPEED_HIGH) { 14158443f2d2SAndrzej Pietrasiewicz config = dev->hs_config->bConfigurationValue; 14168443f2d2SAndrzej Pietrasiewicz power = dev->hs_config->bMaxPower; 14178443f2d2SAndrzej Pietrasiewicz } else { 14188443f2d2SAndrzej Pietrasiewicz config = dev->config->bConfigurationValue; 14198443f2d2SAndrzej Pietrasiewicz power = dev->config->bMaxPower; 14208443f2d2SAndrzej Pietrasiewicz } 14218443f2d2SAndrzej Pietrasiewicz 14228443f2d2SAndrzej Pietrasiewicz if (config == (u8) w_value) { 14238443f2d2SAndrzej Pietrasiewicz value = 0; 14248443f2d2SAndrzej Pietrasiewicz dev->current_config = config; 14258443f2d2SAndrzej Pietrasiewicz usb_gadget_vbus_draw(gadget, 2 * power); 14268443f2d2SAndrzej Pietrasiewicz } 14278443f2d2SAndrzej Pietrasiewicz } 14288443f2d2SAndrzej Pietrasiewicz 14298443f2d2SAndrzej Pietrasiewicz /* report SET_CONFIGURATION like any other control request, 14308443f2d2SAndrzej Pietrasiewicz * except that usermode may not stall this. the next 14318443f2d2SAndrzej Pietrasiewicz * request mustn't be allowed start until this finishes: 14328443f2d2SAndrzej Pietrasiewicz * endpoints and threads set up, etc. 14338443f2d2SAndrzej Pietrasiewicz * 14348443f2d2SAndrzej Pietrasiewicz * NOTE: older PXA hardware (before PXA 255: without UDCCFR) 14358443f2d2SAndrzej Pietrasiewicz * has bad/racey automagic that prevents synchronizing here. 14368443f2d2SAndrzej Pietrasiewicz * even kernel mode drivers often miss them. 14378443f2d2SAndrzej Pietrasiewicz */ 14388443f2d2SAndrzej Pietrasiewicz if (value == 0) { 14398443f2d2SAndrzej Pietrasiewicz INFO (dev, "configuration #%d\n", dev->current_config); 14408443f2d2SAndrzej Pietrasiewicz usb_gadget_set_state(gadget, USB_STATE_CONFIGURED); 14418443f2d2SAndrzej Pietrasiewicz if (dev->usermode_setup) { 14428443f2d2SAndrzej Pietrasiewicz dev->setup_can_stall = 0; 14438443f2d2SAndrzej Pietrasiewicz goto delegate; 14448443f2d2SAndrzej Pietrasiewicz } 14458443f2d2SAndrzej Pietrasiewicz } 14468443f2d2SAndrzej Pietrasiewicz break; 14478443f2d2SAndrzej Pietrasiewicz 14488443f2d2SAndrzej Pietrasiewicz #ifndef CONFIG_USB_PXA25X 14498443f2d2SAndrzej Pietrasiewicz /* PXA automagically handles this request too */ 14508443f2d2SAndrzej Pietrasiewicz case USB_REQ_GET_CONFIGURATION: 14518443f2d2SAndrzej Pietrasiewicz if (ctrl->bRequestType != 0x80) 14528443f2d2SAndrzej Pietrasiewicz goto unrecognized; 14538443f2d2SAndrzej Pietrasiewicz *(u8 *)req->buf = dev->current_config; 14548443f2d2SAndrzej Pietrasiewicz value = min (w_length, (u16) 1); 14558443f2d2SAndrzej Pietrasiewicz break; 14568443f2d2SAndrzej Pietrasiewicz #endif 14578443f2d2SAndrzej Pietrasiewicz 14588443f2d2SAndrzej Pietrasiewicz default: 14598443f2d2SAndrzej Pietrasiewicz unrecognized: 14608443f2d2SAndrzej Pietrasiewicz VDEBUG (dev, "%s req%02x.%02x v%04x i%04x l%d\n", 14618443f2d2SAndrzej Pietrasiewicz dev->usermode_setup ? "delegate" : "fail", 14628443f2d2SAndrzej Pietrasiewicz ctrl->bRequestType, ctrl->bRequest, 14638443f2d2SAndrzej Pietrasiewicz w_value, le16_to_cpu(ctrl->wIndex), w_length); 14648443f2d2SAndrzej Pietrasiewicz 14658443f2d2SAndrzej Pietrasiewicz /* if there's an ep0 reader, don't stall */ 14668443f2d2SAndrzej Pietrasiewicz if (dev->usermode_setup) { 14678443f2d2SAndrzej Pietrasiewicz dev->setup_can_stall = 1; 14688443f2d2SAndrzej Pietrasiewicz delegate: 14698443f2d2SAndrzej Pietrasiewicz dev->setup_in = (ctrl->bRequestType & USB_DIR_IN) 14708443f2d2SAndrzej Pietrasiewicz ? 1 : 0; 14718443f2d2SAndrzej Pietrasiewicz dev->setup_wLength = w_length; 14728443f2d2SAndrzej Pietrasiewicz dev->setup_out_ready = 0; 14738443f2d2SAndrzej Pietrasiewicz dev->setup_out_error = 0; 14748443f2d2SAndrzej Pietrasiewicz 14758443f2d2SAndrzej Pietrasiewicz /* read DATA stage for OUT right away */ 14768443f2d2SAndrzej Pietrasiewicz if (unlikely (!dev->setup_in && w_length)) { 14778443f2d2SAndrzej Pietrasiewicz value = setup_req (gadget->ep0, dev->req, 14788443f2d2SAndrzej Pietrasiewicz w_length); 14798443f2d2SAndrzej Pietrasiewicz if (value < 0) 14808443f2d2SAndrzej Pietrasiewicz break; 1481d246dcb2SBin Liu 1482520b72fcSAlan Stern ++dev->udc_usage; 1483d246dcb2SBin Liu spin_unlock (&dev->lock); 14848443f2d2SAndrzej Pietrasiewicz value = usb_ep_queue (gadget->ep0, dev->req, 1485d246dcb2SBin Liu GFP_KERNEL); 1486d246dcb2SBin Liu spin_lock (&dev->lock); 1487520b72fcSAlan Stern --dev->udc_usage; 14888443f2d2SAndrzej Pietrasiewicz if (value < 0) { 14898443f2d2SAndrzej Pietrasiewicz clean_req (gadget->ep0, dev->req); 14908443f2d2SAndrzej Pietrasiewicz break; 14918443f2d2SAndrzej Pietrasiewicz } 14928443f2d2SAndrzej Pietrasiewicz 14938443f2d2SAndrzej Pietrasiewicz /* we can't currently stall these */ 14948443f2d2SAndrzej Pietrasiewicz dev->setup_can_stall = 0; 14958443f2d2SAndrzej Pietrasiewicz } 14968443f2d2SAndrzej Pietrasiewicz 14978443f2d2SAndrzej Pietrasiewicz /* state changes when reader collects event */ 14988443f2d2SAndrzej Pietrasiewicz event = next_event (dev, GADGETFS_SETUP); 14998443f2d2SAndrzej Pietrasiewicz event->u.setup = *ctrl; 15008443f2d2SAndrzej Pietrasiewicz ep0_readable (dev); 15018443f2d2SAndrzej Pietrasiewicz spin_unlock (&dev->lock); 15028443f2d2SAndrzej Pietrasiewicz return 0; 15038443f2d2SAndrzej Pietrasiewicz } 15048443f2d2SAndrzej Pietrasiewicz } 15058443f2d2SAndrzej Pietrasiewicz 15068443f2d2SAndrzej Pietrasiewicz /* proceed with data transfer and status phases? */ 15078443f2d2SAndrzej Pietrasiewicz if (value >= 0 && dev->state != STATE_DEV_SETUP) { 15088443f2d2SAndrzej Pietrasiewicz req->length = value; 15098443f2d2SAndrzej Pietrasiewicz req->zero = value < w_length; 1510d246dcb2SBin Liu 1511520b72fcSAlan Stern ++dev->udc_usage; 1512d246dcb2SBin Liu spin_unlock (&dev->lock); 1513d246dcb2SBin Liu value = usb_ep_queue (gadget->ep0, req, GFP_KERNEL); 1514520b72fcSAlan Stern spin_lock(&dev->lock); 1515520b72fcSAlan Stern --dev->udc_usage; 1516520b72fcSAlan Stern spin_unlock(&dev->lock); 15178443f2d2SAndrzej Pietrasiewicz if (value < 0) { 15188443f2d2SAndrzej Pietrasiewicz DBG (dev, "ep_queue --> %d\n", value); 15198443f2d2SAndrzej Pietrasiewicz req->status = 0; 15208443f2d2SAndrzej Pietrasiewicz } 1521d246dcb2SBin Liu return value; 15228443f2d2SAndrzej Pietrasiewicz } 15238443f2d2SAndrzej Pietrasiewicz 15248443f2d2SAndrzej Pietrasiewicz /* device stalls when value < 0 */ 15258443f2d2SAndrzej Pietrasiewicz spin_unlock (&dev->lock); 15268443f2d2SAndrzej Pietrasiewicz return value; 15278443f2d2SAndrzej Pietrasiewicz } 15288443f2d2SAndrzej Pietrasiewicz 15298443f2d2SAndrzej Pietrasiewicz static void destroy_ep_files (struct dev_data *dev) 15308443f2d2SAndrzej Pietrasiewicz { 15318443f2d2SAndrzej Pietrasiewicz DBG (dev, "%s %d\n", __func__, dev->state); 15328443f2d2SAndrzej Pietrasiewicz 15338443f2d2SAndrzej Pietrasiewicz /* dev->state must prevent interference */ 15348443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 15358443f2d2SAndrzej Pietrasiewicz while (!list_empty(&dev->epfiles)) { 15368443f2d2SAndrzej Pietrasiewicz struct ep_data *ep; 15378443f2d2SAndrzej Pietrasiewicz struct inode *parent; 15388443f2d2SAndrzej Pietrasiewicz struct dentry *dentry; 15398443f2d2SAndrzej Pietrasiewicz 15408443f2d2SAndrzej Pietrasiewicz /* break link to FS */ 15418443f2d2SAndrzej Pietrasiewicz ep = list_first_entry (&dev->epfiles, struct ep_data, epfiles); 15428443f2d2SAndrzej Pietrasiewicz list_del_init (&ep->epfiles); 1543520b72fcSAlan Stern spin_unlock_irq (&dev->lock); 1544520b72fcSAlan Stern 15458443f2d2SAndrzej Pietrasiewicz dentry = ep->dentry; 15468443f2d2SAndrzej Pietrasiewicz ep->dentry = NULL; 154775c3cfa8SDavid Howells parent = d_inode(dentry->d_parent); 15488443f2d2SAndrzej Pietrasiewicz 15498443f2d2SAndrzej Pietrasiewicz /* break link to controller */ 1550520b72fcSAlan Stern mutex_lock(&ep->lock); 15518443f2d2SAndrzej Pietrasiewicz if (ep->state == STATE_EP_ENABLED) 15528443f2d2SAndrzej Pietrasiewicz (void) usb_ep_disable (ep->ep); 15538443f2d2SAndrzej Pietrasiewicz ep->state = STATE_EP_UNBOUND; 15548443f2d2SAndrzej Pietrasiewicz usb_ep_free_request (ep->ep, ep->req); 15558443f2d2SAndrzej Pietrasiewicz ep->ep = NULL; 1556520b72fcSAlan Stern mutex_unlock(&ep->lock); 1557520b72fcSAlan Stern 15588443f2d2SAndrzej Pietrasiewicz wake_up (&ep->wait); 15598443f2d2SAndrzej Pietrasiewicz put_ep (ep); 15608443f2d2SAndrzej Pietrasiewicz 15618443f2d2SAndrzej Pietrasiewicz /* break link to dcache */ 15625955102cSAl Viro inode_lock(parent); 15638443f2d2SAndrzej Pietrasiewicz d_delete (dentry); 15648443f2d2SAndrzej Pietrasiewicz dput (dentry); 15655955102cSAl Viro inode_unlock(parent); 15668443f2d2SAndrzej Pietrasiewicz 15678443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 15688443f2d2SAndrzej Pietrasiewicz } 15698443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 15708443f2d2SAndrzej Pietrasiewicz } 15718443f2d2SAndrzej Pietrasiewicz 15728443f2d2SAndrzej Pietrasiewicz 1573fb6c3225SAl Viro static struct dentry * 15748443f2d2SAndrzej Pietrasiewicz gadgetfs_create_file (struct super_block *sb, char const *name, 1575fb6c3225SAl Viro void *data, const struct file_operations *fops); 15768443f2d2SAndrzej Pietrasiewicz 15778443f2d2SAndrzej Pietrasiewicz static int activate_ep_files (struct dev_data *dev) 15788443f2d2SAndrzej Pietrasiewicz { 15798443f2d2SAndrzej Pietrasiewicz struct usb_ep *ep; 15808443f2d2SAndrzej Pietrasiewicz struct ep_data *data; 15818443f2d2SAndrzej Pietrasiewicz 15828443f2d2SAndrzej Pietrasiewicz gadget_for_each_ep (ep, dev->gadget) { 15838443f2d2SAndrzej Pietrasiewicz 15848443f2d2SAndrzej Pietrasiewicz data = kzalloc(sizeof(*data), GFP_KERNEL); 15858443f2d2SAndrzej Pietrasiewicz if (!data) 15868443f2d2SAndrzej Pietrasiewicz goto enomem0; 15878443f2d2SAndrzej Pietrasiewicz data->state = STATE_EP_DISABLED; 15888443f2d2SAndrzej Pietrasiewicz mutex_init(&data->lock); 15898443f2d2SAndrzej Pietrasiewicz init_waitqueue_head (&data->wait); 15908443f2d2SAndrzej Pietrasiewicz 15918443f2d2SAndrzej Pietrasiewicz strncpy (data->name, ep->name, sizeof (data->name) - 1); 15928d66db50SElena Reshetova refcount_set (&data->count, 1); 15938443f2d2SAndrzej Pietrasiewicz data->dev = dev; 15948443f2d2SAndrzej Pietrasiewicz get_dev (dev); 15958443f2d2SAndrzej Pietrasiewicz 15968443f2d2SAndrzej Pietrasiewicz data->ep = ep; 15978443f2d2SAndrzej Pietrasiewicz ep->driver_data = data; 15988443f2d2SAndrzej Pietrasiewicz 15998443f2d2SAndrzej Pietrasiewicz data->req = usb_ep_alloc_request (ep, GFP_KERNEL); 16008443f2d2SAndrzej Pietrasiewicz if (!data->req) 16018443f2d2SAndrzej Pietrasiewicz goto enomem1; 16028443f2d2SAndrzej Pietrasiewicz 1603fb6c3225SAl Viro data->dentry = gadgetfs_create_file (dev->sb, data->name, 1604d4461a60SAl Viro data, &ep_io_operations); 1605fb6c3225SAl Viro if (!data->dentry) 16068443f2d2SAndrzej Pietrasiewicz goto enomem2; 16078443f2d2SAndrzej Pietrasiewicz list_add_tail (&data->epfiles, &dev->epfiles); 16088443f2d2SAndrzej Pietrasiewicz } 16098443f2d2SAndrzej Pietrasiewicz return 0; 16108443f2d2SAndrzej Pietrasiewicz 16118443f2d2SAndrzej Pietrasiewicz enomem2: 16128443f2d2SAndrzej Pietrasiewicz usb_ep_free_request (ep, data->req); 16138443f2d2SAndrzej Pietrasiewicz enomem1: 16148443f2d2SAndrzej Pietrasiewicz put_dev (dev); 16158443f2d2SAndrzej Pietrasiewicz kfree (data); 16168443f2d2SAndrzej Pietrasiewicz enomem0: 16178443f2d2SAndrzej Pietrasiewicz DBG (dev, "%s enomem\n", __func__); 16188443f2d2SAndrzej Pietrasiewicz destroy_ep_files (dev); 16198443f2d2SAndrzej Pietrasiewicz return -ENOMEM; 16208443f2d2SAndrzej Pietrasiewicz } 16218443f2d2SAndrzej Pietrasiewicz 16228443f2d2SAndrzej Pietrasiewicz static void 16238443f2d2SAndrzej Pietrasiewicz gadgetfs_unbind (struct usb_gadget *gadget) 16248443f2d2SAndrzej Pietrasiewicz { 16258443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = get_gadget_data (gadget); 16268443f2d2SAndrzej Pietrasiewicz 16278443f2d2SAndrzej Pietrasiewicz DBG (dev, "%s\n", __func__); 16288443f2d2SAndrzej Pietrasiewicz 16298443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 16308443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_UNBOUND; 1631520b72fcSAlan Stern while (dev->udc_usage > 0) { 1632520b72fcSAlan Stern spin_unlock_irq(&dev->lock); 1633520b72fcSAlan Stern usleep_range(1000, 2000); 1634520b72fcSAlan Stern spin_lock_irq(&dev->lock); 1635520b72fcSAlan Stern } 16368443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 16378443f2d2SAndrzej Pietrasiewicz 16388443f2d2SAndrzej Pietrasiewicz destroy_ep_files (dev); 16398443f2d2SAndrzej Pietrasiewicz gadget->ep0->driver_data = NULL; 16408443f2d2SAndrzej Pietrasiewicz set_gadget_data (gadget, NULL); 16418443f2d2SAndrzej Pietrasiewicz 16428443f2d2SAndrzej Pietrasiewicz /* we've already been disconnected ... no i/o is active */ 16438443f2d2SAndrzej Pietrasiewicz if (dev->req) 16448443f2d2SAndrzej Pietrasiewicz usb_ep_free_request (gadget->ep0, dev->req); 16458443f2d2SAndrzej Pietrasiewicz DBG (dev, "%s done\n", __func__); 16468443f2d2SAndrzej Pietrasiewicz put_dev (dev); 16478443f2d2SAndrzej Pietrasiewicz } 16488443f2d2SAndrzej Pietrasiewicz 16498443f2d2SAndrzej Pietrasiewicz static struct dev_data *the_device; 16508443f2d2SAndrzej Pietrasiewicz 16518443f2d2SAndrzej Pietrasiewicz static int gadgetfs_bind(struct usb_gadget *gadget, 16528443f2d2SAndrzej Pietrasiewicz struct usb_gadget_driver *driver) 16538443f2d2SAndrzej Pietrasiewicz { 16548443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = the_device; 16558443f2d2SAndrzej Pietrasiewicz 16568443f2d2SAndrzej Pietrasiewicz if (!dev) 16578443f2d2SAndrzej Pietrasiewicz return -ESRCH; 16588443f2d2SAndrzej Pietrasiewicz if (0 != strcmp (CHIP, gadget->name)) { 16598443f2d2SAndrzej Pietrasiewicz pr_err("%s expected %s controller not %s\n", 16608443f2d2SAndrzej Pietrasiewicz shortname, CHIP, gadget->name); 16618443f2d2SAndrzej Pietrasiewicz return -ENODEV; 16628443f2d2SAndrzej Pietrasiewicz } 16638443f2d2SAndrzej Pietrasiewicz 16648443f2d2SAndrzej Pietrasiewicz set_gadget_data (gadget, dev); 16658443f2d2SAndrzej Pietrasiewicz dev->gadget = gadget; 16668443f2d2SAndrzej Pietrasiewicz gadget->ep0->driver_data = dev; 16678443f2d2SAndrzej Pietrasiewicz 16688443f2d2SAndrzej Pietrasiewicz /* preallocate control response and buffer */ 16698443f2d2SAndrzej Pietrasiewicz dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL); 16708443f2d2SAndrzej Pietrasiewicz if (!dev->req) 16718443f2d2SAndrzej Pietrasiewicz goto enomem; 16728443f2d2SAndrzej Pietrasiewicz dev->req->context = NULL; 16738443f2d2SAndrzej Pietrasiewicz dev->req->complete = epio_complete; 16748443f2d2SAndrzej Pietrasiewicz 16758443f2d2SAndrzej Pietrasiewicz if (activate_ep_files (dev) < 0) 16768443f2d2SAndrzej Pietrasiewicz goto enomem; 16778443f2d2SAndrzej Pietrasiewicz 16788443f2d2SAndrzej Pietrasiewicz INFO (dev, "bound to %s driver\n", gadget->name); 16798443f2d2SAndrzej Pietrasiewicz spin_lock_irq(&dev->lock); 16808443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_UNCONNECTED; 16818443f2d2SAndrzej Pietrasiewicz spin_unlock_irq(&dev->lock); 16828443f2d2SAndrzej Pietrasiewicz get_dev (dev); 16838443f2d2SAndrzej Pietrasiewicz return 0; 16848443f2d2SAndrzej Pietrasiewicz 16858443f2d2SAndrzej Pietrasiewicz enomem: 16868443f2d2SAndrzej Pietrasiewicz gadgetfs_unbind (gadget); 16878443f2d2SAndrzej Pietrasiewicz return -ENOMEM; 16888443f2d2SAndrzej Pietrasiewicz } 16898443f2d2SAndrzej Pietrasiewicz 16908443f2d2SAndrzej Pietrasiewicz static void 16918443f2d2SAndrzej Pietrasiewicz gadgetfs_disconnect (struct usb_gadget *gadget) 16928443f2d2SAndrzej Pietrasiewicz { 16938443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = get_gadget_data (gadget); 16948443f2d2SAndrzej Pietrasiewicz unsigned long flags; 16958443f2d2SAndrzej Pietrasiewicz 16968443f2d2SAndrzej Pietrasiewicz spin_lock_irqsave (&dev->lock, flags); 16978443f2d2SAndrzej Pietrasiewicz if (dev->state == STATE_DEV_UNCONNECTED) 16988443f2d2SAndrzej Pietrasiewicz goto exit; 16998443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_UNCONNECTED; 17008443f2d2SAndrzej Pietrasiewicz 17018443f2d2SAndrzej Pietrasiewicz INFO (dev, "disconnected\n"); 17028443f2d2SAndrzej Pietrasiewicz next_event (dev, GADGETFS_DISCONNECT); 17038443f2d2SAndrzej Pietrasiewicz ep0_readable (dev); 17048443f2d2SAndrzej Pietrasiewicz exit: 17058443f2d2SAndrzej Pietrasiewicz spin_unlock_irqrestore (&dev->lock, flags); 17068443f2d2SAndrzej Pietrasiewicz } 17078443f2d2SAndrzej Pietrasiewicz 17088443f2d2SAndrzej Pietrasiewicz static void 17098443f2d2SAndrzej Pietrasiewicz gadgetfs_suspend (struct usb_gadget *gadget) 17108443f2d2SAndrzej Pietrasiewicz { 17118443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = get_gadget_data (gadget); 1712f16443a0SAlan Stern unsigned long flags; 17138443f2d2SAndrzej Pietrasiewicz 17148443f2d2SAndrzej Pietrasiewicz INFO (dev, "suspended from state %d\n", dev->state); 1715f16443a0SAlan Stern spin_lock_irqsave(&dev->lock, flags); 17168443f2d2SAndrzej Pietrasiewicz switch (dev->state) { 17178443f2d2SAndrzej Pietrasiewicz case STATE_DEV_SETUP: // VERY odd... host died?? 17188443f2d2SAndrzej Pietrasiewicz case STATE_DEV_CONNECTED: 17198443f2d2SAndrzej Pietrasiewicz case STATE_DEV_UNCONNECTED: 17208443f2d2SAndrzej Pietrasiewicz next_event (dev, GADGETFS_SUSPEND); 17218443f2d2SAndrzej Pietrasiewicz ep0_readable (dev); 17228443f2d2SAndrzej Pietrasiewicz /* FALLTHROUGH */ 17238443f2d2SAndrzej Pietrasiewicz default: 17248443f2d2SAndrzej Pietrasiewicz break; 17258443f2d2SAndrzej Pietrasiewicz } 1726f16443a0SAlan Stern spin_unlock_irqrestore(&dev->lock, flags); 17278443f2d2SAndrzej Pietrasiewicz } 17288443f2d2SAndrzej Pietrasiewicz 17298443f2d2SAndrzej Pietrasiewicz static struct usb_gadget_driver gadgetfs_driver = { 17308443f2d2SAndrzej Pietrasiewicz .function = (char *) driver_desc, 17318443f2d2SAndrzej Pietrasiewicz .bind = gadgetfs_bind, 17328443f2d2SAndrzej Pietrasiewicz .unbind = gadgetfs_unbind, 17338443f2d2SAndrzej Pietrasiewicz .setup = gadgetfs_setup, 17340eba4550SPeter Chen .reset = gadgetfs_disconnect, 17358443f2d2SAndrzej Pietrasiewicz .disconnect = gadgetfs_disconnect, 17368443f2d2SAndrzej Pietrasiewicz .suspend = gadgetfs_suspend, 17378443f2d2SAndrzej Pietrasiewicz 17388443f2d2SAndrzej Pietrasiewicz .driver = { 17398443f2d2SAndrzej Pietrasiewicz .name = (char *) shortname, 17408443f2d2SAndrzej Pietrasiewicz }, 17418443f2d2SAndrzej Pietrasiewicz }; 17428443f2d2SAndrzej Pietrasiewicz 17438443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 17448443f2d2SAndrzej Pietrasiewicz /* DEVICE INITIALIZATION 17458443f2d2SAndrzej Pietrasiewicz * 17468443f2d2SAndrzej Pietrasiewicz * fd = open ("/dev/gadget/$CHIP", O_RDWR) 17478443f2d2SAndrzej Pietrasiewicz * status = write (fd, descriptors, sizeof descriptors) 17488443f2d2SAndrzej Pietrasiewicz * 17498443f2d2SAndrzej Pietrasiewicz * That write establishes the device configuration, so the kernel can 17508443f2d2SAndrzej Pietrasiewicz * bind to the controller ... guaranteeing it can handle enumeration 17518443f2d2SAndrzej Pietrasiewicz * at all necessary speeds. Descriptor order is: 17528443f2d2SAndrzej Pietrasiewicz * 17538443f2d2SAndrzej Pietrasiewicz * . message tag (u32, host order) ... for now, must be zero; it 17548443f2d2SAndrzej Pietrasiewicz * would change to support features like multi-config devices 17558443f2d2SAndrzej Pietrasiewicz * . full/low speed config ... all wTotalLength bytes (with interface, 17568443f2d2SAndrzej Pietrasiewicz * class, altsetting, endpoint, and other descriptors) 17578443f2d2SAndrzej Pietrasiewicz * . high speed config ... all descriptors, for high speed operation; 17588443f2d2SAndrzej Pietrasiewicz * this one's optional except for high-speed hardware 17598443f2d2SAndrzej Pietrasiewicz * . device descriptor 17608443f2d2SAndrzej Pietrasiewicz * 17618443f2d2SAndrzej Pietrasiewicz * Endpoints are not yet enabled. Drivers must wait until device 17628443f2d2SAndrzej Pietrasiewicz * configuration and interface altsetting changes create 17638443f2d2SAndrzej Pietrasiewicz * the need to configure (or unconfigure) them. 17648443f2d2SAndrzej Pietrasiewicz * 17658443f2d2SAndrzej Pietrasiewicz * After initialization, the device stays active for as long as that 17668443f2d2SAndrzej Pietrasiewicz * $CHIP file is open. Events must then be read from that descriptor, 17678443f2d2SAndrzej Pietrasiewicz * such as configuration notifications. 17688443f2d2SAndrzej Pietrasiewicz */ 17698443f2d2SAndrzej Pietrasiewicz 17701c069b05SAlan Stern static int is_valid_config(struct usb_config_descriptor *config, 17711c069b05SAlan Stern unsigned int total) 17728443f2d2SAndrzej Pietrasiewicz { 17738443f2d2SAndrzej Pietrasiewicz return config->bDescriptorType == USB_DT_CONFIG 17748443f2d2SAndrzej Pietrasiewicz && config->bLength == USB_DT_CONFIG_SIZE 17751c069b05SAlan Stern && total >= USB_DT_CONFIG_SIZE 17768443f2d2SAndrzej Pietrasiewicz && config->bConfigurationValue != 0 17778443f2d2SAndrzej Pietrasiewicz && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0 17788443f2d2SAndrzej Pietrasiewicz && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0; 17798443f2d2SAndrzej Pietrasiewicz /* FIXME if gadget->is_otg, _must_ include an otg descriptor */ 17808443f2d2SAndrzej Pietrasiewicz /* FIXME check lengths: walk to end */ 17818443f2d2SAndrzej Pietrasiewicz } 17828443f2d2SAndrzej Pietrasiewicz 17838443f2d2SAndrzej Pietrasiewicz static ssize_t 17848443f2d2SAndrzej Pietrasiewicz dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr) 17858443f2d2SAndrzej Pietrasiewicz { 17868443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = fd->private_data; 17878443f2d2SAndrzej Pietrasiewicz ssize_t value = len, length = len; 17888443f2d2SAndrzej Pietrasiewicz unsigned total; 17898443f2d2SAndrzej Pietrasiewicz u32 tag; 17908443f2d2SAndrzej Pietrasiewicz char *kbuf; 17918443f2d2SAndrzej Pietrasiewicz 179296b62a57SAlan Stern spin_lock_irq(&dev->lock); 179396b62a57SAlan Stern if (dev->state > STATE_DEV_OPENED) { 179496b62a57SAlan Stern value = ep0_write(fd, buf, len, ptr); 179596b62a57SAlan Stern spin_unlock_irq(&dev->lock); 179696b62a57SAlan Stern return value; 179796b62a57SAlan Stern } 179896b62a57SAlan Stern spin_unlock_irq(&dev->lock); 179996b62a57SAlan Stern 18000994b0a2SGreg Kroah-Hartman if ((len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4)) || 18010994b0a2SGreg Kroah-Hartman (len > PAGE_SIZE * 4)) 18028443f2d2SAndrzej Pietrasiewicz return -EINVAL; 18038443f2d2SAndrzej Pietrasiewicz 18048443f2d2SAndrzej Pietrasiewicz /* we might need to change message format someday */ 18058443f2d2SAndrzej Pietrasiewicz if (copy_from_user (&tag, buf, 4)) 18068443f2d2SAndrzej Pietrasiewicz return -EFAULT; 18078443f2d2SAndrzej Pietrasiewicz if (tag != 0) 18088443f2d2SAndrzej Pietrasiewicz return -EINVAL; 18098443f2d2SAndrzej Pietrasiewicz buf += 4; 18108443f2d2SAndrzej Pietrasiewicz length -= 4; 18118443f2d2SAndrzej Pietrasiewicz 18128443f2d2SAndrzej Pietrasiewicz kbuf = memdup_user(buf, length); 18138443f2d2SAndrzej Pietrasiewicz if (IS_ERR(kbuf)) 18148443f2d2SAndrzej Pietrasiewicz return PTR_ERR(kbuf); 18158443f2d2SAndrzej Pietrasiewicz 18168443f2d2SAndrzej Pietrasiewicz spin_lock_irq (&dev->lock); 18178443f2d2SAndrzej Pietrasiewicz value = -EINVAL; 1818b6e7aeeaSChristophe JAILLET if (dev->buf) { 1819b6e7aeeaSChristophe JAILLET kfree(kbuf); 18208443f2d2SAndrzej Pietrasiewicz goto fail; 1821b6e7aeeaSChristophe JAILLET } 18228443f2d2SAndrzej Pietrasiewicz dev->buf = kbuf; 18238443f2d2SAndrzej Pietrasiewicz 18248443f2d2SAndrzej Pietrasiewicz /* full or low speed config */ 18258443f2d2SAndrzej Pietrasiewicz dev->config = (void *) kbuf; 18268443f2d2SAndrzej Pietrasiewicz total = le16_to_cpu(dev->config->wTotalLength); 18271c069b05SAlan Stern if (!is_valid_config(dev->config, total) || 18281c069b05SAlan Stern total > length - USB_DT_DEVICE_SIZE) 18298443f2d2SAndrzej Pietrasiewicz goto fail; 18308443f2d2SAndrzej Pietrasiewicz kbuf += total; 18318443f2d2SAndrzej Pietrasiewicz length -= total; 18328443f2d2SAndrzej Pietrasiewicz 18338443f2d2SAndrzej Pietrasiewicz /* optional high speed config */ 18348443f2d2SAndrzej Pietrasiewicz if (kbuf [1] == USB_DT_CONFIG) { 18358443f2d2SAndrzej Pietrasiewicz dev->hs_config = (void *) kbuf; 18368443f2d2SAndrzej Pietrasiewicz total = le16_to_cpu(dev->hs_config->wTotalLength); 18371c069b05SAlan Stern if (!is_valid_config(dev->hs_config, total) || 18381c069b05SAlan Stern total > length - USB_DT_DEVICE_SIZE) 18398443f2d2SAndrzej Pietrasiewicz goto fail; 18408443f2d2SAndrzej Pietrasiewicz kbuf += total; 18418443f2d2SAndrzej Pietrasiewicz length -= total; 1842add333a8SAlan Stern } else { 1843add333a8SAlan Stern dev->hs_config = NULL; 18448443f2d2SAndrzej Pietrasiewicz } 18458443f2d2SAndrzej Pietrasiewicz 18468443f2d2SAndrzej Pietrasiewicz /* could support multiple configs, using another encoding! */ 18478443f2d2SAndrzej Pietrasiewicz 18488443f2d2SAndrzej Pietrasiewicz /* device descriptor (tweaked for paranoia) */ 18498443f2d2SAndrzej Pietrasiewicz if (length != USB_DT_DEVICE_SIZE) 18508443f2d2SAndrzej Pietrasiewicz goto fail; 18518443f2d2SAndrzej Pietrasiewicz dev->dev = (void *)kbuf; 18528443f2d2SAndrzej Pietrasiewicz if (dev->dev->bLength != USB_DT_DEVICE_SIZE 18538443f2d2SAndrzej Pietrasiewicz || dev->dev->bDescriptorType != USB_DT_DEVICE 18548443f2d2SAndrzej Pietrasiewicz || dev->dev->bNumConfigurations != 1) 18558443f2d2SAndrzej Pietrasiewicz goto fail; 18568443f2d2SAndrzej Pietrasiewicz dev->dev->bcdUSB = cpu_to_le16 (0x0200); 18578443f2d2SAndrzej Pietrasiewicz 18588443f2d2SAndrzej Pietrasiewicz /* triggers gadgetfs_bind(); then we can enumerate. */ 18598443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 18608443f2d2SAndrzej Pietrasiewicz if (dev->hs_config) 18618443f2d2SAndrzej Pietrasiewicz gadgetfs_driver.max_speed = USB_SPEED_HIGH; 18628443f2d2SAndrzej Pietrasiewicz else 18638443f2d2SAndrzej Pietrasiewicz gadgetfs_driver.max_speed = USB_SPEED_FULL; 18648443f2d2SAndrzej Pietrasiewicz 18658443f2d2SAndrzej Pietrasiewicz value = usb_gadget_probe_driver(&gadgetfs_driver); 18668443f2d2SAndrzej Pietrasiewicz if (value != 0) { 18678443f2d2SAndrzej Pietrasiewicz kfree (dev->buf); 18688443f2d2SAndrzej Pietrasiewicz dev->buf = NULL; 18698443f2d2SAndrzej Pietrasiewicz } else { 18708443f2d2SAndrzej Pietrasiewicz /* at this point "good" hardware has for the first time 18718443f2d2SAndrzej Pietrasiewicz * let the USB the host see us. alternatively, if users 18728443f2d2SAndrzej Pietrasiewicz * unplug/replug that will clear all the error state. 18738443f2d2SAndrzej Pietrasiewicz * 18748443f2d2SAndrzej Pietrasiewicz * note: everything running before here was guaranteed 18758443f2d2SAndrzej Pietrasiewicz * to choke driver model style diagnostics. from here 18768443f2d2SAndrzej Pietrasiewicz * on, they can work ... except in cleanup paths that 18778443f2d2SAndrzej Pietrasiewicz * kick in after the ep0 descriptor is closed. 18788443f2d2SAndrzej Pietrasiewicz */ 18798443f2d2SAndrzej Pietrasiewicz value = len; 18807b0a271dSMarek Szyprowski dev->gadget_registered = true; 18818443f2d2SAndrzej Pietrasiewicz } 18828443f2d2SAndrzej Pietrasiewicz return value; 18838443f2d2SAndrzej Pietrasiewicz 18848443f2d2SAndrzej Pietrasiewicz fail: 18858443f2d2SAndrzej Pietrasiewicz spin_unlock_irq (&dev->lock); 18865b5e0928SAlexey Dobriyan pr_debug ("%s: %s fail %zd, %p\n", shortname, __func__, value, dev); 18878443f2d2SAndrzej Pietrasiewicz kfree (dev->buf); 18888443f2d2SAndrzej Pietrasiewicz dev->buf = NULL; 18898443f2d2SAndrzej Pietrasiewicz return value; 18908443f2d2SAndrzej Pietrasiewicz } 18918443f2d2SAndrzej Pietrasiewicz 18928443f2d2SAndrzej Pietrasiewicz static int 18938443f2d2SAndrzej Pietrasiewicz dev_open (struct inode *inode, struct file *fd) 18948443f2d2SAndrzej Pietrasiewicz { 18958443f2d2SAndrzej Pietrasiewicz struct dev_data *dev = inode->i_private; 18968443f2d2SAndrzej Pietrasiewicz int value = -EBUSY; 18978443f2d2SAndrzej Pietrasiewicz 18988443f2d2SAndrzej Pietrasiewicz spin_lock_irq(&dev->lock); 18998443f2d2SAndrzej Pietrasiewicz if (dev->state == STATE_DEV_DISABLED) { 19008443f2d2SAndrzej Pietrasiewicz dev->ev_next = 0; 19018443f2d2SAndrzej Pietrasiewicz dev->state = STATE_DEV_OPENED; 19028443f2d2SAndrzej Pietrasiewicz fd->private_data = dev; 19038443f2d2SAndrzej Pietrasiewicz get_dev (dev); 19048443f2d2SAndrzej Pietrasiewicz value = 0; 19058443f2d2SAndrzej Pietrasiewicz } 19068443f2d2SAndrzej Pietrasiewicz spin_unlock_irq(&dev->lock); 19078443f2d2SAndrzej Pietrasiewicz return value; 19088443f2d2SAndrzej Pietrasiewicz } 19098443f2d2SAndrzej Pietrasiewicz 191096b62a57SAlan Stern static const struct file_operations ep0_operations = { 19118443f2d2SAndrzej Pietrasiewicz .llseek = no_llseek, 19128443f2d2SAndrzej Pietrasiewicz 19138443f2d2SAndrzej Pietrasiewicz .open = dev_open, 191496b62a57SAlan Stern .read = ep0_read, 19158443f2d2SAndrzej Pietrasiewicz .write = dev_config, 19168443f2d2SAndrzej Pietrasiewicz .fasync = ep0_fasync, 191796b62a57SAlan Stern .poll = ep0_poll, 19188443f2d2SAndrzej Pietrasiewicz .unlocked_ioctl = dev_ioctl, 19198443f2d2SAndrzej Pietrasiewicz .release = dev_release, 19208443f2d2SAndrzej Pietrasiewicz }; 19218443f2d2SAndrzej Pietrasiewicz 19228443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 19238443f2d2SAndrzej Pietrasiewicz 19248443f2d2SAndrzej Pietrasiewicz /* FILESYSTEM AND SUPERBLOCK OPERATIONS 19258443f2d2SAndrzej Pietrasiewicz * 19268443f2d2SAndrzej Pietrasiewicz * Mounting the filesystem creates a controller file, used first for 19278443f2d2SAndrzej Pietrasiewicz * device configuration then later for event monitoring. 19288443f2d2SAndrzej Pietrasiewicz */ 19298443f2d2SAndrzej Pietrasiewicz 19308443f2d2SAndrzej Pietrasiewicz 19318443f2d2SAndrzej Pietrasiewicz /* FIXME PAM etc could set this security policy without mount options 19328443f2d2SAndrzej Pietrasiewicz * if epfiles inherited ownership and permissons from ep0 ... 19338443f2d2SAndrzej Pietrasiewicz */ 19348443f2d2SAndrzej Pietrasiewicz 19358443f2d2SAndrzej Pietrasiewicz static unsigned default_uid; 19368443f2d2SAndrzej Pietrasiewicz static unsigned default_gid; 19378443f2d2SAndrzej Pietrasiewicz static unsigned default_perm = S_IRUSR | S_IWUSR; 19388443f2d2SAndrzej Pietrasiewicz 19398443f2d2SAndrzej Pietrasiewicz module_param (default_uid, uint, 0644); 19408443f2d2SAndrzej Pietrasiewicz module_param (default_gid, uint, 0644); 19418443f2d2SAndrzej Pietrasiewicz module_param (default_perm, uint, 0644); 19428443f2d2SAndrzej Pietrasiewicz 19438443f2d2SAndrzej Pietrasiewicz 19448443f2d2SAndrzej Pietrasiewicz static struct inode * 19458443f2d2SAndrzej Pietrasiewicz gadgetfs_make_inode (struct super_block *sb, 19468443f2d2SAndrzej Pietrasiewicz void *data, const struct file_operations *fops, 19478443f2d2SAndrzej Pietrasiewicz int mode) 19488443f2d2SAndrzej Pietrasiewicz { 19498443f2d2SAndrzej Pietrasiewicz struct inode *inode = new_inode (sb); 19508443f2d2SAndrzej Pietrasiewicz 19518443f2d2SAndrzej Pietrasiewicz if (inode) { 19528443f2d2SAndrzej Pietrasiewicz inode->i_ino = get_next_ino(); 19538443f2d2SAndrzej Pietrasiewicz inode->i_mode = mode; 19548443f2d2SAndrzej Pietrasiewicz inode->i_uid = make_kuid(&init_user_ns, default_uid); 19558443f2d2SAndrzej Pietrasiewicz inode->i_gid = make_kgid(&init_user_ns, default_gid); 19568443f2d2SAndrzej Pietrasiewicz inode->i_atime = inode->i_mtime = inode->i_ctime 1957078cd827SDeepa Dinamani = current_time(inode); 19588443f2d2SAndrzej Pietrasiewicz inode->i_private = data; 19598443f2d2SAndrzej Pietrasiewicz inode->i_fop = fops; 19608443f2d2SAndrzej Pietrasiewicz } 19618443f2d2SAndrzej Pietrasiewicz return inode; 19628443f2d2SAndrzej Pietrasiewicz } 19638443f2d2SAndrzej Pietrasiewicz 19648443f2d2SAndrzej Pietrasiewicz /* creates in fs root directory, so non-renamable and non-linkable. 19658443f2d2SAndrzej Pietrasiewicz * so inode and dentry are paired, until device reconfig. 19668443f2d2SAndrzej Pietrasiewicz */ 1967fb6c3225SAl Viro static struct dentry * 19688443f2d2SAndrzej Pietrasiewicz gadgetfs_create_file (struct super_block *sb, char const *name, 1969fb6c3225SAl Viro void *data, const struct file_operations *fops) 19708443f2d2SAndrzej Pietrasiewicz { 19718443f2d2SAndrzej Pietrasiewicz struct dentry *dentry; 19728443f2d2SAndrzej Pietrasiewicz struct inode *inode; 19738443f2d2SAndrzej Pietrasiewicz 19748443f2d2SAndrzej Pietrasiewicz dentry = d_alloc_name(sb->s_root, name); 19758443f2d2SAndrzej Pietrasiewicz if (!dentry) 19768443f2d2SAndrzej Pietrasiewicz return NULL; 19778443f2d2SAndrzej Pietrasiewicz 19788443f2d2SAndrzej Pietrasiewicz inode = gadgetfs_make_inode (sb, data, fops, 19798443f2d2SAndrzej Pietrasiewicz S_IFREG | (default_perm & S_IRWXUGO)); 19808443f2d2SAndrzej Pietrasiewicz if (!inode) { 19818443f2d2SAndrzej Pietrasiewicz dput(dentry); 19828443f2d2SAndrzej Pietrasiewicz return NULL; 19838443f2d2SAndrzej Pietrasiewicz } 19848443f2d2SAndrzej Pietrasiewicz d_add (dentry, inode); 1985fb6c3225SAl Viro return dentry; 19868443f2d2SAndrzej Pietrasiewicz } 19878443f2d2SAndrzej Pietrasiewicz 19888443f2d2SAndrzej Pietrasiewicz static const struct super_operations gadget_fs_operations = { 19898443f2d2SAndrzej Pietrasiewicz .statfs = simple_statfs, 19908443f2d2SAndrzej Pietrasiewicz .drop_inode = generic_delete_inode, 19918443f2d2SAndrzej Pietrasiewicz }; 19928443f2d2SAndrzej Pietrasiewicz 19938443f2d2SAndrzej Pietrasiewicz static int 1994e5d82a73SDavid Howells gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc) 19958443f2d2SAndrzej Pietrasiewicz { 19968443f2d2SAndrzej Pietrasiewicz struct inode *inode; 19978443f2d2SAndrzej Pietrasiewicz struct dev_data *dev; 19988443f2d2SAndrzej Pietrasiewicz 19998443f2d2SAndrzej Pietrasiewicz if (the_device) 20008443f2d2SAndrzej Pietrasiewicz return -ESRCH; 20018443f2d2SAndrzej Pietrasiewicz 2002175f7121SMarek Szyprowski CHIP = usb_get_gadget_udc_name(); 20038443f2d2SAndrzej Pietrasiewicz if (!CHIP) 20048443f2d2SAndrzej Pietrasiewicz return -ENODEV; 20058443f2d2SAndrzej Pietrasiewicz 20068443f2d2SAndrzej Pietrasiewicz /* superblock */ 200709cbfeafSKirill A. Shutemov sb->s_blocksize = PAGE_SIZE; 200809cbfeafSKirill A. Shutemov sb->s_blocksize_bits = PAGE_SHIFT; 20098443f2d2SAndrzej Pietrasiewicz sb->s_magic = GADGETFS_MAGIC; 20108443f2d2SAndrzej Pietrasiewicz sb->s_op = &gadget_fs_operations; 20118443f2d2SAndrzej Pietrasiewicz sb->s_time_gran = 1; 20128443f2d2SAndrzej Pietrasiewicz 20138443f2d2SAndrzej Pietrasiewicz /* root inode */ 20148443f2d2SAndrzej Pietrasiewicz inode = gadgetfs_make_inode (sb, 20158443f2d2SAndrzej Pietrasiewicz NULL, &simple_dir_operations, 20168443f2d2SAndrzej Pietrasiewicz S_IFDIR | S_IRUGO | S_IXUGO); 20178443f2d2SAndrzej Pietrasiewicz if (!inode) 20188443f2d2SAndrzej Pietrasiewicz goto Enomem; 20198443f2d2SAndrzej Pietrasiewicz inode->i_op = &simple_dir_inode_operations; 20208443f2d2SAndrzej Pietrasiewicz if (!(sb->s_root = d_make_root (inode))) 20218443f2d2SAndrzej Pietrasiewicz goto Enomem; 20228443f2d2SAndrzej Pietrasiewicz 20238443f2d2SAndrzej Pietrasiewicz /* the ep0 file is named after the controller we expect; 20248443f2d2SAndrzej Pietrasiewicz * user mode code can use it for sanity checks, like we do. 20258443f2d2SAndrzej Pietrasiewicz */ 20268443f2d2SAndrzej Pietrasiewicz dev = dev_new (); 20278443f2d2SAndrzej Pietrasiewicz if (!dev) 20288443f2d2SAndrzej Pietrasiewicz goto Enomem; 20298443f2d2SAndrzej Pietrasiewicz 20308443f2d2SAndrzej Pietrasiewicz dev->sb = sb; 203196b62a57SAlan Stern dev->dentry = gadgetfs_create_file(sb, CHIP, dev, &ep0_operations); 2032fb6c3225SAl Viro if (!dev->dentry) { 20338443f2d2SAndrzej Pietrasiewicz put_dev(dev); 20348443f2d2SAndrzej Pietrasiewicz goto Enomem; 20358443f2d2SAndrzej Pietrasiewicz } 20368443f2d2SAndrzej Pietrasiewicz 20378443f2d2SAndrzej Pietrasiewicz /* other endpoint files are available after hardware setup, 20388443f2d2SAndrzej Pietrasiewicz * from binding to a controller. 20398443f2d2SAndrzej Pietrasiewicz */ 20408443f2d2SAndrzej Pietrasiewicz the_device = dev; 20418443f2d2SAndrzej Pietrasiewicz return 0; 20428443f2d2SAndrzej Pietrasiewicz 20438443f2d2SAndrzej Pietrasiewicz Enomem: 20448443f2d2SAndrzej Pietrasiewicz return -ENOMEM; 20458443f2d2SAndrzej Pietrasiewicz } 20468443f2d2SAndrzej Pietrasiewicz 20478443f2d2SAndrzej Pietrasiewicz /* "mount -t gadgetfs path /dev/gadget" ends up here */ 2048e5d82a73SDavid Howells static int gadgetfs_get_tree(struct fs_context *fc) 20498443f2d2SAndrzej Pietrasiewicz { 2050e5d82a73SDavid Howells return get_tree_single(fc, gadgetfs_fill_super); 2051e5d82a73SDavid Howells } 2052e5d82a73SDavid Howells 2053e5d82a73SDavid Howells static const struct fs_context_operations gadgetfs_context_ops = { 2054e5d82a73SDavid Howells .get_tree = gadgetfs_get_tree, 2055e5d82a73SDavid Howells }; 2056e5d82a73SDavid Howells 2057e5d82a73SDavid Howells static int gadgetfs_init_fs_context(struct fs_context *fc) 2058e5d82a73SDavid Howells { 2059e5d82a73SDavid Howells fc->ops = &gadgetfs_context_ops; 2060e5d82a73SDavid Howells return 0; 20618443f2d2SAndrzej Pietrasiewicz } 20628443f2d2SAndrzej Pietrasiewicz 20638443f2d2SAndrzej Pietrasiewicz static void 20648443f2d2SAndrzej Pietrasiewicz gadgetfs_kill_sb (struct super_block *sb) 20658443f2d2SAndrzej Pietrasiewicz { 20668443f2d2SAndrzej Pietrasiewicz kill_litter_super (sb); 20678443f2d2SAndrzej Pietrasiewicz if (the_device) { 20688443f2d2SAndrzej Pietrasiewicz put_dev (the_device); 20698443f2d2SAndrzej Pietrasiewicz the_device = NULL; 20708443f2d2SAndrzej Pietrasiewicz } 2071175f7121SMarek Szyprowski kfree(CHIP); 2072175f7121SMarek Szyprowski CHIP = NULL; 20738443f2d2SAndrzej Pietrasiewicz } 20748443f2d2SAndrzej Pietrasiewicz 20758443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 20768443f2d2SAndrzej Pietrasiewicz 20778443f2d2SAndrzej Pietrasiewicz static struct file_system_type gadgetfs_type = { 20788443f2d2SAndrzej Pietrasiewicz .owner = THIS_MODULE, 20798443f2d2SAndrzej Pietrasiewicz .name = shortname, 2080e5d82a73SDavid Howells .init_fs_context = gadgetfs_init_fs_context, 20818443f2d2SAndrzej Pietrasiewicz .kill_sb = gadgetfs_kill_sb, 20828443f2d2SAndrzej Pietrasiewicz }; 20838443f2d2SAndrzej Pietrasiewicz MODULE_ALIAS_FS("gadgetfs"); 20848443f2d2SAndrzej Pietrasiewicz 20858443f2d2SAndrzej Pietrasiewicz /*----------------------------------------------------------------------*/ 20868443f2d2SAndrzej Pietrasiewicz 20878443f2d2SAndrzej Pietrasiewicz static int __init init (void) 20888443f2d2SAndrzej Pietrasiewicz { 20898443f2d2SAndrzej Pietrasiewicz int status; 20908443f2d2SAndrzej Pietrasiewicz 20918443f2d2SAndrzej Pietrasiewicz status = register_filesystem (&gadgetfs_type); 20928443f2d2SAndrzej Pietrasiewicz if (status == 0) 20938443f2d2SAndrzej Pietrasiewicz pr_info ("%s: %s, version " DRIVER_VERSION "\n", 20948443f2d2SAndrzej Pietrasiewicz shortname, driver_desc); 20958443f2d2SAndrzej Pietrasiewicz return status; 20968443f2d2SAndrzej Pietrasiewicz } 20978443f2d2SAndrzej Pietrasiewicz module_init (init); 20988443f2d2SAndrzej Pietrasiewicz 20998443f2d2SAndrzej Pietrasiewicz static void __exit cleanup (void) 21008443f2d2SAndrzej Pietrasiewicz { 21018443f2d2SAndrzej Pietrasiewicz pr_debug ("unregister %s\n", shortname); 21028443f2d2SAndrzej Pietrasiewicz unregister_filesystem (&gadgetfs_type); 21038443f2d2SAndrzej Pietrasiewicz } 21048443f2d2SAndrzej Pietrasiewicz module_exit (cleanup); 21058443f2d2SAndrzej Pietrasiewicz 2106