15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * LEGO USB Tower driver 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net> 61da177e4SLinus Torvalds * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * derived from USB Skeleton driver - 0.5 91da177e4SLinus Torvalds * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * History: 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * 2001-10-13 - 0.1 js 141da177e4SLinus Torvalds * - first version 151da177e4SLinus Torvalds * 2001-11-03 - 0.2 js 161da177e4SLinus Torvalds * - simplified buffering, one-shot URBs for writing 171da177e4SLinus Torvalds * 2001-11-10 - 0.3 js 181da177e4SLinus Torvalds * - removed IOCTL (setting power/mode is more complicated, postponed) 191da177e4SLinus Torvalds * 2001-11-28 - 0.4 js 201da177e4SLinus Torvalds * - added vendor commands for mode of operation and power level in open 211da177e4SLinus Torvalds * 2001-12-04 - 0.5 js 221da177e4SLinus Torvalds * - set IR mode by default (by oversight 0.4 set VLL mode) 231da177e4SLinus Torvalds * 2002-01-11 - 0.5? pcchan 241da177e4SLinus Torvalds * - make read buffer reusable and work around bytes_to_write issue between 251da177e4SLinus Torvalds * uhci and legusbtower 261da177e4SLinus Torvalds * 2002-09-23 - 0.52 david (david@csse.uwa.edu.au) 271da177e4SLinus Torvalds * - imported into lejos project 281da177e4SLinus Torvalds * - changed wake_up to wake_up_interruptible 291da177e4SLinus Torvalds * - changed to use lego0 rather than tower0 30441b62c1SHarvey Harrison * - changed dbg() to use __func__ rather than deprecated __func__ 311da177e4SLinus Torvalds * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au) 321da177e4SLinus Torvalds * - changed read and write to write everything or 331da177e4SLinus Torvalds * timeout (from a patch by Chris Riesen and Brett Thaeler driver) 341da177e4SLinus Torvalds * - added ioctl functionality to set timeouts 351da177e4SLinus Torvalds * 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au) 361da177e4SLinus Torvalds * - initial import into LegoUSB project 371da177e4SLinus Torvalds * - merge of existing LegoUSB.c driver 381da177e4SLinus Torvalds * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au) 391da177e4SLinus Torvalds * - port to 2.6 style driver 401da177e4SLinus Torvalds * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net> 411da177e4SLinus Torvalds * - fix locking 421da177e4SLinus Torvalds * - unlink read URBs which are no longer needed 431da177e4SLinus Torvalds * - allow increased buffer size, eliminates need for timeout on write 441da177e4SLinus Torvalds * - have read URB running continuously 451da177e4SLinus Torvalds * - added poll 461da177e4SLinus Torvalds * - forbid seeking 471da177e4SLinus Torvalds * - added nonblocking I/O 48441b62c1SHarvey Harrison * - changed back __func__ to __func__ 491da177e4SLinus Torvalds * - read and log tower firmware version 501da177e4SLinus Torvalds * - reset tower on probe, avoids failure of first write 511da177e4SLinus Torvalds * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net> 521da177e4SLinus Torvalds * - timeout read now only after inactivity, shorten default accordingly 531da177e4SLinus Torvalds * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net> 541da177e4SLinus Torvalds * - log major, minor instead of possibly confusing device filename 551da177e4SLinus Torvalds * - whitespace cleanup 561da177e4SLinus Torvalds * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net> 571da177e4SLinus Torvalds * - normalize whitespace in debug messages 581da177e4SLinus Torvalds * - take care about endianness in control message responses 591da177e4SLinus Torvalds * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net> 601da177e4SLinus Torvalds * - make default intervals longer to accommodate current EHCI driver 611da177e4SLinus Torvalds * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net> 621da177e4SLinus Torvalds * - replaced atomic_t by memory barriers 631da177e4SLinus Torvalds * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net> 641da177e4SLinus Torvalds * - wait for completion of write urb in release (needed for remotecontrol) 651da177e4SLinus Torvalds * - corrected poll for write direction (missing negation) 661da177e4SLinus Torvalds * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net> 671da177e4SLinus Torvalds * - make device locking interruptible 681da177e4SLinus Torvalds * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net> 691da177e4SLinus Torvalds * - check for valid udev on resubmitting and unlinking urbs 701da177e4SLinus Torvalds * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net> 711da177e4SLinus Torvalds * - move reset into open to clean out spurious data 721da177e4SLinus Torvalds */ 731da177e4SLinus Torvalds 7438726bf5SGreg Kroah-Hartman #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7538726bf5SGreg Kroah-Hartman 761da177e4SLinus Torvalds #include <linux/kernel.h> 771da177e4SLinus Torvalds #include <linux/errno.h> 781da177e4SLinus Torvalds #include <linux/slab.h> 791da177e4SLinus Torvalds #include <linux/module.h> 801da177e4SLinus Torvalds #include <linux/completion.h> 814186ecf8SArjan van de Ven #include <linux/mutex.h> 827c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 831da177e4SLinus Torvalds #include <linux/usb.h> 841da177e4SLinus Torvalds #include <linux/poll.h> 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" 881da177e4SLinus Torvalds #define DRIVER_DESC "LEGO USB Tower Driver" 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* The defaults are chosen to work with the latest versions of leJOS and NQC. 921da177e4SLinus Torvalds */ 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* Some legacy software likes to receive packets in one piece. 951da177e4SLinus Torvalds * In this case read_buffer_size should exceed the maximal packet length 961da177e4SLinus Torvalds * (417 for datalog uploads), and packet_timeout should be set. 971da177e4SLinus Torvalds */ 981da177e4SLinus Torvalds static int read_buffer_size = 480; 991da177e4SLinus Torvalds module_param(read_buffer_size, int, 0); 1001da177e4SLinus Torvalds MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* Some legacy software likes to send packets in one piece. 1031da177e4SLinus Torvalds * In this case write_buffer_size should exceed the maximal packet length 1041da177e4SLinus Torvalds * (417 for firmware and program downloads). 1051da177e4SLinus Torvalds * A problem with long writes is that the following read may time out 1061da177e4SLinus Torvalds * if the software is not prepared to wait long enough. 1071da177e4SLinus Torvalds */ 1081da177e4SLinus Torvalds static int write_buffer_size = 480; 1091da177e4SLinus Torvalds module_param(write_buffer_size, int, 0); 1101da177e4SLinus Torvalds MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* Some legacy software expects reads to contain whole LASM packets. 1131da177e4SLinus Torvalds * To achieve this, characters which arrive before a packet timeout 1141da177e4SLinus Torvalds * occurs will be returned in a single read operation. 1151da177e4SLinus Torvalds * A problem with long reads is that the software may time out 1161da177e4SLinus Torvalds * if it is not prepared to wait long enough. 1171da177e4SLinus Torvalds * The packet timeout should be greater than the time between the 1181da177e4SLinus Torvalds * reception of subsequent characters, which should arrive about 1191da177e4SLinus Torvalds * every 5ms for the standard 2400 baud. 1201da177e4SLinus Torvalds * Set it to 0 to disable. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds static int packet_timeout = 50; 1231da177e4SLinus Torvalds module_param(packet_timeout, int, 0); 1241da177e4SLinus Torvalds MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* Some legacy software expects blocking reads to time out. 1271da177e4SLinus Torvalds * Timeout occurs after the specified time of read and write inactivity. 1281da177e4SLinus Torvalds * Set it to 0 to disable. 1291da177e4SLinus Torvalds */ 1301da177e4SLinus Torvalds static int read_timeout = 200; 1311da177e4SLinus Torvalds module_param(read_timeout, int, 0); 1321da177e4SLinus Torvalds MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* As of kernel version 2.6.4 ehci-hcd uses an 1351da177e4SLinus Torvalds * "only one interrupt transfer per frame" shortcut 1361da177e4SLinus Torvalds * to simplify the scheduling of periodic transfers. 1371da177e4SLinus Torvalds * This conflicts with our standard 1ms intervals for in and out URBs. 1381da177e4SLinus Torvalds * We use default intervals of 2ms for in and 8ms for out transfers, 1391da177e4SLinus Torvalds * which is fast enough for 2400 baud and allows a small additional load. 1401da177e4SLinus Torvalds * Increase the interval to allow more devices that do interrupt transfers, 1411da177e4SLinus Torvalds * or set to 0 to use the standard interval from the endpoint descriptors. 1421da177e4SLinus Torvalds */ 1431da177e4SLinus Torvalds static int interrupt_in_interval = 2; 1441da177e4SLinus Torvalds module_param(interrupt_in_interval, int, 0); 1451da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static int interrupt_out_interval = 8; 1481da177e4SLinus Torvalds module_param(interrupt_out_interval, int, 0); 1491da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* Define these values to match your device */ 1521da177e4SLinus Torvalds #define LEGO_USB_TOWER_VENDOR_ID 0x0694 1531da177e4SLinus Torvalds #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* Vendor requests */ 1561da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_RESET 0x04 1571da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds struct tower_reset_reply { 16072877248SJohan Hovold __le16 size; 1611da177e4SLinus Torvalds __u8 err_code; 1621da177e4SLinus Torvalds __u8 spare; 163a76c234fSJohan Hovold }; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds struct tower_get_version_reply { 16672877248SJohan Hovold __le16 size; 1671da177e4SLinus Torvalds __u8 err_code; 1681da177e4SLinus Torvalds __u8 spare; 1691da177e4SLinus Torvalds __u8 major; 1701da177e4SLinus Torvalds __u8 minor; 17172877248SJohan Hovold __le16 build_no; 172a76c234fSJohan Hovold }; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* table of devices that work with this driver */ 17633b9e162SNémeth Márton static const struct usb_device_id tower_table[] = { 1771da177e4SLinus Torvalds { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, 1781da177e4SLinus Torvalds { } /* Terminating entry */ 1791da177e4SLinus Torvalds }; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds MODULE_DEVICE_TABLE(usb, tower_table); 1821da177e4SLinus Torvalds 1831da177e4SLinus Torvalds #define LEGO_USB_TOWER_MINOR_BASE 160 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds /* Structure to hold all of our device specific stuff */ 1871da177e4SLinus Torvalds struct lego_usb_tower { 18818bcbcfeSDaniel Walker struct mutex lock; /* locks this structure */ 1891da177e4SLinus Torvalds struct usb_device *udev; /* save off the usb device pointer */ 1901da177e4SLinus Torvalds unsigned char minor; /* the starting minor number for this device */ 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds int open_count; /* number of times this port has been opened */ 193cd81e6faSJohan Hovold unsigned long disconnected:1; 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds char *read_buffer; 1961da177e4SLinus Torvalds size_t read_buffer_length; /* this much came in */ 1971da177e4SLinus Torvalds size_t read_packet_length; /* this much will be returned on read */ 1981da177e4SLinus Torvalds spinlock_t read_buffer_lock; 1991da177e4SLinus Torvalds int packet_timeout_jiffies; 2001da177e4SLinus Torvalds unsigned long read_last_arrival; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds wait_queue_head_t read_wait; 2031da177e4SLinus Torvalds wait_queue_head_t write_wait; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds char *interrupt_in_buffer; 2061da177e4SLinus Torvalds struct usb_endpoint_descriptor *interrupt_in_endpoint; 2071da177e4SLinus Torvalds struct urb *interrupt_in_urb; 2081da177e4SLinus Torvalds int interrupt_in_interval; 2091da177e4SLinus Torvalds int interrupt_in_done; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds char *interrupt_out_buffer; 2121da177e4SLinus Torvalds struct usb_endpoint_descriptor *interrupt_out_endpoint; 2131da177e4SLinus Torvalds struct urb *interrupt_out_urb; 2141da177e4SLinus Torvalds int interrupt_out_interval; 2151da177e4SLinus Torvalds int interrupt_out_busy; 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds }; 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* local function prototypes */ 2211da177e4SLinus Torvalds static ssize_t tower_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos); 2221da177e4SLinus Torvalds static ssize_t tower_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos); 2231da177e4SLinus Torvalds static inline void tower_delete(struct lego_usb_tower *dev); 2241da177e4SLinus Torvalds static int tower_open(struct inode *inode, struct file *file); 2251da177e4SLinus Torvalds static int tower_release(struct inode *inode, struct file *file); 226afc9a42bSAl Viro static __poll_t tower_poll(struct file *file, poll_table *wait); 2271da177e4SLinus Torvalds static loff_t tower_llseek(struct file *file, loff_t off, int whence); 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds static void tower_check_for_read_packet(struct lego_usb_tower *dev); 2307d12e780SDavid Howells static void tower_interrupt_in_callback(struct urb *urb); 2317d12e780SDavid Howells static void tower_interrupt_out_callback(struct urb *urb); 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds static int tower_probe(struct usb_interface *interface, const struct usb_device_id *id); 2341da177e4SLinus Torvalds static void tower_disconnect(struct usb_interface *interface); 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* file operations needed when we register this driver */ 238066202ddSLuiz Fernando N. Capitulino static const struct file_operations tower_fops = { 2391da177e4SLinus Torvalds .owner = THIS_MODULE, 2401da177e4SLinus Torvalds .read = tower_read, 2411da177e4SLinus Torvalds .write = tower_write, 2421da177e4SLinus Torvalds .open = tower_open, 2431da177e4SLinus Torvalds .release = tower_release, 2441da177e4SLinus Torvalds .poll = tower_poll, 2451da177e4SLinus Torvalds .llseek = tower_llseek, 2461da177e4SLinus Torvalds }; 2471da177e4SLinus Torvalds 2482c9ede55SAl Viro static char *legousbtower_devnode(struct device *dev, umode_t *mode) 249f7a386c5SKay Sievers { 250f7a386c5SKay Sievers return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 251f7a386c5SKay Sievers } 252f7a386c5SKay Sievers 2531da177e4SLinus Torvalds /* 2541da177e4SLinus Torvalds * usb class driver info in order to get a minor number from the usb core, 255d6e5bcf4SGreg Kroah-Hartman * and to have the device registered with the driver core 2561da177e4SLinus Torvalds */ 2571da177e4SLinus Torvalds static struct usb_class_driver tower_class = { 258d6e5bcf4SGreg Kroah-Hartman .name = "legousbtower%d", 259e454cea2SKay Sievers .devnode = legousbtower_devnode, 2601da177e4SLinus Torvalds .fops = &tower_fops, 2611da177e4SLinus Torvalds .minor_base = LEGO_USB_TOWER_MINOR_BASE, 2621da177e4SLinus Torvalds }; 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds /* usb specific object needed to register this driver with the usb subsystem */ 2661da177e4SLinus Torvalds static struct usb_driver tower_driver = { 2671da177e4SLinus Torvalds .name = "legousbtower", 2681da177e4SLinus Torvalds .probe = tower_probe, 2691da177e4SLinus Torvalds .disconnect = tower_disconnect, 2701da177e4SLinus Torvalds .id_table = tower_table, 2711da177e4SLinus Torvalds }; 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds /** 2751da177e4SLinus Torvalds * lego_usb_tower_debug_data 2761da177e4SLinus Torvalds */ 2774dae9963SGreg Kroah-Hartman static inline void lego_usb_tower_debug_data(struct device *dev, 2784dae9963SGreg Kroah-Hartman const char *function, int size, 2794dae9963SGreg Kroah-Hartman const unsigned char *data) 2801da177e4SLinus Torvalds { 2814dae9963SGreg Kroah-Hartman dev_dbg(dev, "%s - length = %d, data = %*ph\n", 2824dae9963SGreg Kroah-Hartman function, size, size, data); 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds /** 2871da177e4SLinus Torvalds * tower_delete 2881da177e4SLinus Torvalds */ 2891da177e4SLinus Torvalds static inline void tower_delete(struct lego_usb_tower *dev) 2901da177e4SLinus Torvalds { 2911da177e4SLinus Torvalds /* free data structures */ 2921da177e4SLinus Torvalds usb_free_urb(dev->interrupt_in_urb); 2931da177e4SLinus Torvalds usb_free_urb(dev->interrupt_out_urb); 2941da177e4SLinus Torvalds kfree(dev->read_buffer); 2951da177e4SLinus Torvalds kfree(dev->interrupt_in_buffer); 2961da177e4SLinus Torvalds kfree(dev->interrupt_out_buffer); 297726b55d0SJohan Hovold usb_put_dev(dev->udev); 2981da177e4SLinus Torvalds kfree(dev); 2991da177e4SLinus Torvalds } 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds /** 3031da177e4SLinus Torvalds * tower_open 3041da177e4SLinus Torvalds */ 3051da177e4SLinus Torvalds static int tower_open(struct inode *inode, struct file *file) 3061da177e4SLinus Torvalds { 3071da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 3081da177e4SLinus Torvalds int subminor; 3091da177e4SLinus Torvalds int retval = 0; 3101da177e4SLinus Torvalds struct usb_interface *interface; 311942a4873SMaksim Salau struct tower_reset_reply *reset_reply; 3121da177e4SLinus Torvalds int result; 3131da177e4SLinus Torvalds 314942a4873SMaksim Salau reset_reply = kmalloc(sizeof(*reset_reply), GFP_KERNEL); 315942a4873SMaksim Salau 316942a4873SMaksim Salau if (!reset_reply) { 317942a4873SMaksim Salau retval = -ENOMEM; 318942a4873SMaksim Salau goto exit; 319942a4873SMaksim Salau } 320942a4873SMaksim Salau 3211da177e4SLinus Torvalds nonseekable_open(inode, file); 3221da177e4SLinus Torvalds subminor = iminor(inode); 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds interface = usb_find_interface(&tower_driver, subminor); 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds if (!interface) { 32738726bf5SGreg Kroah-Hartman pr_err("error, can't find device for minor %d\n", subminor); 3281da177e4SLinus Torvalds retval = -ENODEV; 329d4ead16fSAlan Stern goto exit; 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 3331da177e4SLinus Torvalds if (!dev) { 3341da177e4SLinus Torvalds retval = -ENODEV; 335d4ead16fSAlan Stern goto exit; 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds /* lock this device */ 33918bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 3401da177e4SLinus Torvalds retval = -ERESTARTSYS; 341d4ead16fSAlan Stern goto exit; 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 34478663eccSOliver Neukum 3451da177e4SLinus Torvalds /* allow opening only once */ 3461da177e4SLinus Torvalds if (dev->open_count) { 3471da177e4SLinus Torvalds retval = -EBUSY; 3481da177e4SLinus Torvalds goto unlock_exit; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds /* reset the tower */ 3521da177e4SLinus Torvalds result = usb_control_msg(dev->udev, 3531da177e4SLinus Torvalds usb_rcvctrlpipe(dev->udev, 0), 3541da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_RESET, 3551da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 3561da177e4SLinus Torvalds 0, 3571da177e4SLinus Torvalds 0, 358942a4873SMaksim Salau reset_reply, 359942a4873SMaksim Salau sizeof(*reset_reply), 3601da177e4SLinus Torvalds 1000); 3611da177e4SLinus Torvalds if (result < 0) { 3629d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3639d974b2aSGreg Kroah-Hartman "LEGO USB Tower reset control request failed\n"); 3641da177e4SLinus Torvalds retval = result; 3651da177e4SLinus Torvalds goto unlock_exit; 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds /* initialize in direction */ 3691da177e4SLinus Torvalds dev->read_buffer_length = 0; 3701da177e4SLinus Torvalds dev->read_packet_length = 0; 3711da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_in_urb, 3721da177e4SLinus Torvalds dev->udev, 3731da177e4SLinus Torvalds usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), 3741da177e4SLinus Torvalds dev->interrupt_in_buffer, 37529cc8897SKuninori Morimoto usb_endpoint_maxp(dev->interrupt_in_endpoint), 3761da177e4SLinus Torvalds tower_interrupt_in_callback, 3771da177e4SLinus Torvalds dev, 3781da177e4SLinus Torvalds dev->interrupt_in_interval); 3791da177e4SLinus Torvalds 3801da177e4SLinus Torvalds dev->interrupt_in_done = 0; 3811da177e4SLinus Torvalds mb(); 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 3841da177e4SLinus Torvalds if (retval) { 3859d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3869d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_in_urb %d\n", retval); 3871da177e4SLinus Torvalds goto unlock_exit; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds /* save device in the file's private structure */ 3911da177e4SLinus Torvalds file->private_data = dev; 3921da177e4SLinus Torvalds 3930b074f69SJohan Hovold dev->open_count = 1; 3940b074f69SJohan Hovold 3951da177e4SLinus Torvalds unlock_exit: 39618bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 3971da177e4SLinus Torvalds 398d4ead16fSAlan Stern exit: 399942a4873SMaksim Salau kfree(reset_reply); 4001da177e4SLinus Torvalds return retval; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /** 4041da177e4SLinus Torvalds * tower_release 4051da177e4SLinus Torvalds */ 4061da177e4SLinus Torvalds static int tower_release(struct inode *inode, struct file *file) 4071da177e4SLinus Torvalds { 4081da177e4SLinus Torvalds struct lego_usb_tower *dev; 4091da177e4SLinus Torvalds int retval = 0; 4101da177e4SLinus Torvalds 4115bd6e8b3SJoe Perches dev = file->private_data; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds if (dev == NULL) { 4141da177e4SLinus Torvalds retval = -ENODEV; 41533a78132SJohan Hovold goto exit; 4161da177e4SLinus Torvalds } 4171da177e4SLinus Torvalds 418b6c03e5fSJohan Hovold mutex_lock(&dev->lock); 4191da177e4SLinus Torvalds 420cd81e6faSJohan Hovold if (dev->disconnected) { 4211da177e4SLinus Torvalds /* the device was unplugged before the file was released */ 42218bcbcfeSDaniel Walker 42318bcbcfeSDaniel Walker /* unlock here as tower_delete frees dev */ 42418bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4251da177e4SLinus Torvalds tower_delete(dev); 4261da177e4SLinus Torvalds goto exit; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* wait until write transfer is finished */ 4301da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 431a0cd1df9SJohan Hovold wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 432a0cd1df9SJohan Hovold 2 * HZ); 4331da177e4SLinus Torvalds } 434aa6f3832SJohan Hovold 435aa6f3832SJohan Hovold /* shutdown transfers */ 436aa6f3832SJohan Hovold usb_kill_urb(dev->interrupt_in_urb); 437aa6f3832SJohan Hovold usb_kill_urb(dev->interrupt_out_urb); 438aa6f3832SJohan Hovold 4391da177e4SLinus Torvalds dev->open_count = 0; 4401da177e4SLinus Torvalds 44118bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4421da177e4SLinus Torvalds exit: 4431da177e4SLinus Torvalds return retval; 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds 4461da177e4SLinus Torvalds /** 4471da177e4SLinus Torvalds * tower_check_for_read_packet 4481da177e4SLinus Torvalds * 4491da177e4SLinus Torvalds * To get correct semantics for signals and non-blocking I/O 4501da177e4SLinus Torvalds * with packetizing we pretend not to see any data in the read buffer 4511da177e4SLinus Torvalds * until it has been there unchanged for at least 4521da177e4SLinus Torvalds * dev->packet_timeout_jiffies, or until the buffer is full. 4531da177e4SLinus Torvalds */ 4541da177e4SLinus Torvalds static void tower_check_for_read_packet(struct lego_usb_tower *dev) 4551da177e4SLinus Torvalds { 4561da177e4SLinus Torvalds spin_lock_irq(&dev->read_buffer_lock); 4571da177e4SLinus Torvalds if (!packet_timeout 4581da177e4SLinus Torvalds || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) 4591da177e4SLinus Torvalds || dev->read_buffer_length == read_buffer_size) { 4601da177e4SLinus Torvalds dev->read_packet_length = dev->read_buffer_length; 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds dev->interrupt_in_done = 0; 4631da177e4SLinus Torvalds spin_unlock_irq(&dev->read_buffer_lock); 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds /** 4681da177e4SLinus Torvalds * tower_poll 4691da177e4SLinus Torvalds */ 470afc9a42bSAl Viro static __poll_t tower_poll(struct file *file, poll_table *wait) 4711da177e4SLinus Torvalds { 4721da177e4SLinus Torvalds struct lego_usb_tower *dev; 473afc9a42bSAl Viro __poll_t mask = 0; 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds dev = file->private_data; 4761da177e4SLinus Torvalds 477cd81e6faSJohan Hovold if (dev->disconnected) 478a9a08845SLinus Torvalds return EPOLLERR | EPOLLHUP; 479d35b4ce1SOliver Neukum 4801da177e4SLinus Torvalds poll_wait(file, &dev->read_wait, wait); 4811da177e4SLinus Torvalds poll_wait(file, &dev->write_wait, wait); 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds tower_check_for_read_packet(dev); 4841da177e4SLinus Torvalds if (dev->read_packet_length > 0) { 485a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 4861da177e4SLinus Torvalds } 4871da177e4SLinus Torvalds if (!dev->interrupt_out_busy) { 488a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds return mask; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds 4951da177e4SLinus Torvalds /** 4961da177e4SLinus Torvalds * tower_llseek 4971da177e4SLinus Torvalds */ 4981da177e4SLinus Torvalds static loff_t tower_llseek(struct file *file, loff_t off, int whence) 4991da177e4SLinus Torvalds { 5001da177e4SLinus Torvalds return -ESPIPE; /* unseekable */ 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /** 5051da177e4SLinus Torvalds * tower_read 5061da177e4SLinus Torvalds */ 5071da177e4SLinus Torvalds static ssize_t tower_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) 5081da177e4SLinus Torvalds { 5091da177e4SLinus Torvalds struct lego_usb_tower *dev; 5101da177e4SLinus Torvalds size_t bytes_to_read; 5111da177e4SLinus Torvalds int i; 5121da177e4SLinus Torvalds int retval = 0; 5131da177e4SLinus Torvalds unsigned long timeout = 0; 5141da177e4SLinus Torvalds 5155bd6e8b3SJoe Perches dev = file->private_data; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* lock this object */ 51818bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 5191da177e4SLinus Torvalds retval = -ERESTARTSYS; 5201da177e4SLinus Torvalds goto exit; 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 524cd81e6faSJohan Hovold if (dev->disconnected) { 5251da177e4SLinus Torvalds retval = -ENODEV; 5261da177e4SLinus Torvalds goto unlock_exit; 5271da177e4SLinus Torvalds } 5281da177e4SLinus Torvalds 5291da177e4SLinus Torvalds /* verify that we actually have some data to read */ 5301da177e4SLinus Torvalds if (count == 0) { 531fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "read request of 0 bytes\n"); 5321da177e4SLinus Torvalds goto unlock_exit; 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds if (read_timeout) { 5368f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds /* wait for data */ 5401da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5411da177e4SLinus Torvalds while (dev->read_packet_length == 0) { 5421da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 5431da177e4SLinus Torvalds retval = -EAGAIN; 5441da177e4SLinus Torvalds goto unlock_exit; 5451da177e4SLinus Torvalds } 5461da177e4SLinus Torvalds retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); 5471da177e4SLinus Torvalds if (retval < 0) { 5481da177e4SLinus Torvalds goto unlock_exit; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* reset read timeout during read or write activity */ 5521da177e4SLinus Torvalds if (read_timeout 5531da177e4SLinus Torvalds && (dev->read_buffer_length || dev->interrupt_out_busy)) { 5548f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5551da177e4SLinus Torvalds } 5561da177e4SLinus Torvalds /* check for read timeout */ 5571da177e4SLinus Torvalds if (read_timeout && time_after(jiffies, timeout)) { 5581da177e4SLinus Torvalds retval = -ETIMEDOUT; 5591da177e4SLinus Torvalds goto unlock_exit; 5601da177e4SLinus Torvalds } 5611da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds /* copy the data from read_buffer into userspace */ 5651da177e4SLinus Torvalds bytes_to_read = min(count, dev->read_packet_length); 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds if (copy_to_user(buffer, dev->read_buffer, bytes_to_read)) { 5681da177e4SLinus Torvalds retval = -EFAULT; 5691da177e4SLinus Torvalds goto unlock_exit; 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds spin_lock_irq(&dev->read_buffer_lock); 5731da177e4SLinus Torvalds dev->read_buffer_length -= bytes_to_read; 5741da177e4SLinus Torvalds dev->read_packet_length -= bytes_to_read; 5751da177e4SLinus Torvalds for (i=0; i<dev->read_buffer_length; i++) { 5761da177e4SLinus Torvalds dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds spin_unlock_irq(&dev->read_buffer_lock); 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds retval = bytes_to_read; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds unlock_exit: 5831da177e4SLinus Torvalds /* unlock the device */ 58418bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds exit: 5871da177e4SLinus Torvalds return retval; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds /** 5921da177e4SLinus Torvalds * tower_write 5931da177e4SLinus Torvalds */ 5941da177e4SLinus Torvalds static ssize_t tower_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 5951da177e4SLinus Torvalds { 5961da177e4SLinus Torvalds struct lego_usb_tower *dev; 5971da177e4SLinus Torvalds size_t bytes_to_write; 5981da177e4SLinus Torvalds int retval = 0; 5991da177e4SLinus Torvalds 6005bd6e8b3SJoe Perches dev = file->private_data; 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds /* lock this object */ 60318bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 6041da177e4SLinus Torvalds retval = -ERESTARTSYS; 6051da177e4SLinus Torvalds goto exit; 6061da177e4SLinus Torvalds } 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 609cd81e6faSJohan Hovold if (dev->disconnected) { 6101da177e4SLinus Torvalds retval = -ENODEV; 6111da177e4SLinus Torvalds goto unlock_exit; 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds /* verify that we actually have some data to write */ 6151da177e4SLinus Torvalds if (count == 0) { 616fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "write request of 0 bytes\n"); 6171da177e4SLinus Torvalds goto unlock_exit; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds 6201da177e4SLinus Torvalds /* wait until previous transfer is finished */ 6211da177e4SLinus Torvalds while (dev->interrupt_out_busy) { 6221da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 6231da177e4SLinus Torvalds retval = -EAGAIN; 6241da177e4SLinus Torvalds goto unlock_exit; 6251da177e4SLinus Torvalds } 626a0cd1df9SJohan Hovold retval = wait_event_interruptible(dev->write_wait, 627a0cd1df9SJohan Hovold !dev->interrupt_out_busy); 6281da177e4SLinus Torvalds if (retval) { 6291da177e4SLinus Torvalds goto unlock_exit; 6301da177e4SLinus Torvalds } 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* write the data into interrupt_out_buffer from userspace */ 6341da177e4SLinus Torvalds bytes_to_write = min_t(int, count, write_buffer_size); 6355b5e0928SAlexey Dobriyan dev_dbg(&dev->udev->dev, "%s: count = %zd, bytes_to_write = %zd\n", 636fef526caSGreg Kroah-Hartman __func__, count, bytes_to_write); 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 6391da177e4SLinus Torvalds retval = -EFAULT; 6401da177e4SLinus Torvalds goto unlock_exit; 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* send off the urb */ 6441da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_out_urb, 6451da177e4SLinus Torvalds dev->udev, 6461da177e4SLinus Torvalds usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 6471da177e4SLinus Torvalds dev->interrupt_out_buffer, 6481da177e4SLinus Torvalds bytes_to_write, 6491da177e4SLinus Torvalds tower_interrupt_out_callback, 6501da177e4SLinus Torvalds dev, 6511da177e4SLinus Torvalds dev->interrupt_out_interval); 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds dev->interrupt_out_busy = 1; 6541da177e4SLinus Torvalds wmb(); 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 6571da177e4SLinus Torvalds if (retval) { 6581da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 6599d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 6609d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_out_urb %d\n", retval); 6611da177e4SLinus Torvalds goto unlock_exit; 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds retval = bytes_to_write; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds unlock_exit: 6661da177e4SLinus Torvalds /* unlock the device */ 66718bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds exit: 6701da177e4SLinus Torvalds return retval; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /** 6751da177e4SLinus Torvalds * tower_interrupt_in_callback 6761da177e4SLinus Torvalds */ 6777d12e780SDavid Howells static void tower_interrupt_in_callback(struct urb *urb) 6781da177e4SLinus Torvalds { 679cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 68064771a0fSGreg Kroah-Hartman int status = urb->status; 6811da177e4SLinus Torvalds int retval; 6824327059aSSebastian Andrzej Siewior unsigned long flags; 6831da177e4SLinus Torvalds 6844dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 6854dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 6861da177e4SLinus Torvalds 68764771a0fSGreg Kroah-Hartman if (status) { 68864771a0fSGreg Kroah-Hartman if (status == -ENOENT || 68964771a0fSGreg Kroah-Hartman status == -ECONNRESET || 69064771a0fSGreg Kroah-Hartman status == -ESHUTDOWN) { 6911da177e4SLinus Torvalds goto exit; 6921da177e4SLinus Torvalds } else { 693fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 694fef526caSGreg Kroah-Hartman "%s: nonzero status received: %d\n", __func__, 695fef526caSGreg Kroah-Hartman status); 6961da177e4SLinus Torvalds goto resubmit; /* maybe we can recover */ 6971da177e4SLinus Torvalds } 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7001da177e4SLinus Torvalds if (urb->actual_length > 0) { 7014327059aSSebastian Andrzej Siewior spin_lock_irqsave(&dev->read_buffer_lock, flags); 7021da177e4SLinus Torvalds if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { 7031da177e4SLinus Torvalds memcpy(dev->read_buffer + dev->read_buffer_length, 7041da177e4SLinus Torvalds dev->interrupt_in_buffer, 7051da177e4SLinus Torvalds urb->actual_length); 7061da177e4SLinus Torvalds dev->read_buffer_length += urb->actual_length; 7071da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 708fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: received %d bytes\n", 709fef526caSGreg Kroah-Hartman __func__, urb->actual_length); 7101da177e4SLinus Torvalds } else { 71138726bf5SGreg Kroah-Hartman pr_warn("read_buffer overflow, %d bytes dropped\n", 71238726bf5SGreg Kroah-Hartman urb->actual_length); 7131da177e4SLinus Torvalds } 7144327059aSSebastian Andrzej Siewior spin_unlock_irqrestore(&dev->read_buffer_lock, flags); 7151da177e4SLinus Torvalds } 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds resubmit: 7181da177e4SLinus Torvalds retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 719728fcd55SJohan Hovold if (retval) { 720728fcd55SJohan Hovold dev_err(&dev->udev->dev, "%s: usb_submit_urb failed (%d)\n", 7219d974b2aSGreg Kroah-Hartman __func__, retval); 7221da177e4SLinus Torvalds } 7231da177e4SLinus Torvalds exit: 7241da177e4SLinus Torvalds dev->interrupt_in_done = 1; 7251da177e4SLinus Torvalds wake_up_interruptible(&dev->read_wait); 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvalds /** 7301da177e4SLinus Torvalds * tower_interrupt_out_callback 7311da177e4SLinus Torvalds */ 7327d12e780SDavid Howells static void tower_interrupt_out_callback(struct urb *urb) 7331da177e4SLinus Torvalds { 734cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 73564771a0fSGreg Kroah-Hartman int status = urb->status; 7361da177e4SLinus Torvalds 7374dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7384dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds /* sync/async unlink faults aren't errors */ 74164771a0fSGreg Kroah-Hartman if (status && !(status == -ENOENT || 74264771a0fSGreg Kroah-Hartman status == -ECONNRESET || 74364771a0fSGreg Kroah-Hartman status == -ESHUTDOWN)) { 744fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 745fef526caSGreg Kroah-Hartman "%s: nonzero write bulk status received: %d\n", __func__, 746fef526caSGreg Kroah-Hartman status); 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7501da177e4SLinus Torvalds wake_up_interruptible(&dev->write_wait); 7511da177e4SLinus Torvalds } 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds /** 7551da177e4SLinus Torvalds * tower_probe 7561da177e4SLinus Torvalds * 7571da177e4SLinus Torvalds * Called by the usb core when a new device is connected that it thinks 7581da177e4SLinus Torvalds * this driver might be interested in. 7591da177e4SLinus Torvalds */ 7601da177e4SLinus Torvalds static int tower_probe(struct usb_interface *interface, const struct usb_device_id *id) 7611da177e4SLinus Torvalds { 7629d974b2aSGreg Kroah-Hartman struct device *idev = &interface->dev; 7631da177e4SLinus Torvalds struct usb_device *udev = interface_to_usbdev(interface); 76430da837aSJohan Hovold struct lego_usb_tower *dev; 765942a4873SMaksim Salau struct tower_get_version_reply *get_version_reply = NULL; 7661da177e4SLinus Torvalds int retval = -ENOMEM; 7671da177e4SLinus Torvalds int result; 7681da177e4SLinus Torvalds 769093cf723SSteven Cole /* allocate memory for our device state and initialize it */ 77030da837aSJohan Hovold dev = kzalloc(sizeof(*dev), GFP_KERNEL); 77149d8ffabSWolfram Sang if (!dev) 7721da177e4SLinus Torvalds goto exit; 7731da177e4SLinus Torvalds 77418bcbcfeSDaniel Walker mutex_init(&dev->lock); 775726b55d0SJohan Hovold dev->udev = usb_get_dev(udev); 7761da177e4SLinus Torvalds spin_lock_init(&dev->read_buffer_lock); 7778f7e9473SNicholas Mc Guire dev->packet_timeout_jiffies = msecs_to_jiffies(packet_timeout); 7781da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 7791da177e4SLinus Torvalds init_waitqueue_head(&dev->read_wait); 7801da177e4SLinus Torvalds init_waitqueue_head(&dev->write_wait); 7811da177e4SLinus Torvalds 7829b181166SJohan Hovold result = usb_find_common_endpoints_reverse(interface->cur_altsetting, 7839b181166SJohan Hovold NULL, NULL, 7849b181166SJohan Hovold &dev->interrupt_in_endpoint, 7859b181166SJohan Hovold &dev->interrupt_out_endpoint); 7869b181166SJohan Hovold if (result) { 7879b181166SJohan Hovold dev_err(idev, "interrupt endpoints not found\n"); 7889b181166SJohan Hovold retval = result; 7891da177e4SLinus Torvalds goto error; 7901da177e4SLinus Torvalds } 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds dev->read_buffer = kmalloc(read_buffer_size, GFP_KERNEL); 79349d8ffabSWolfram Sang if (!dev->read_buffer) 7941da177e4SLinus Torvalds goto error; 79529cc8897SKuninori Morimoto dev->interrupt_in_buffer = kmalloc(usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL); 79649d8ffabSWolfram Sang if (!dev->interrupt_in_buffer) 7971da177e4SLinus Torvalds goto error; 7981da177e4SLinus Torvalds dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 799a131f41fSWolfram Sang if (!dev->interrupt_in_urb) 8001da177e4SLinus Torvalds goto error; 8011da177e4SLinus Torvalds dev->interrupt_out_buffer = kmalloc(write_buffer_size, GFP_KERNEL); 80249d8ffabSWolfram Sang if (!dev->interrupt_out_buffer) 8031da177e4SLinus Torvalds goto error; 8041da177e4SLinus Torvalds dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 805a131f41fSWolfram Sang if (!dev->interrupt_out_urb) 8061da177e4SLinus Torvalds goto error; 8071da177e4SLinus Torvalds dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 8081da177e4SLinus Torvalds dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 8091da177e4SLinus Torvalds 810942a4873SMaksim Salau get_version_reply = kmalloc(sizeof(*get_version_reply), GFP_KERNEL); 811942a4873SMaksim Salau 812942a4873SMaksim Salau if (!get_version_reply) { 813942a4873SMaksim Salau retval = -ENOMEM; 814942a4873SMaksim Salau goto error; 815942a4873SMaksim Salau } 816942a4873SMaksim Salau 8171da177e4SLinus Torvalds /* get the firmware version and log it */ 8181da177e4SLinus Torvalds result = usb_control_msg(udev, 8191da177e4SLinus Torvalds usb_rcvctrlpipe(udev, 0), 8201da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_GET_VERSION, 8211da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 8221da177e4SLinus Torvalds 0, 8231da177e4SLinus Torvalds 0, 824942a4873SMaksim Salau get_version_reply, 825942a4873SMaksim Salau sizeof(*get_version_reply), 8261da177e4SLinus Torvalds 1000); 827fd47a417SDan Carpenter if (result != sizeof(*get_version_reply)) { 8281d427be4SJohan Hovold if (result >= 0) 8291d427be4SJohan Hovold result = -EIO; 8301d427be4SJohan Hovold dev_err(idev, "get version request failed: %d\n", result); 8311da177e4SLinus Torvalds retval = result; 8321da177e4SLinus Torvalds goto error; 8331da177e4SLinus Torvalds } 834942a4873SMaksim Salau dev_info(&interface->dev, 835942a4873SMaksim Salau "LEGO USB Tower firmware version is %d.%d build %d\n", 836942a4873SMaksim Salau get_version_reply->major, 837942a4873SMaksim Salau get_version_reply->minor, 838942a4873SMaksim Salau le16_to_cpu(get_version_reply->build_no)); 8391da177e4SLinus Torvalds 8402fae9e5aSGreg Kroah-Hartman /* we can register the device now, as it is ready */ 8412fae9e5aSGreg Kroah-Hartman usb_set_intfdata(interface, dev); 8422fae9e5aSGreg Kroah-Hartman 8432fae9e5aSGreg Kroah-Hartman retval = usb_register_dev(interface, &tower_class); 8442fae9e5aSGreg Kroah-Hartman 8452fae9e5aSGreg Kroah-Hartman if (retval) { 8462fae9e5aSGreg Kroah-Hartman /* something prevented us from registering this driver */ 8472fae9e5aSGreg Kroah-Hartman dev_err(idev, "Not able to get a minor for this device.\n"); 8482fae9e5aSGreg Kroah-Hartman goto error; 8492fae9e5aSGreg Kroah-Hartman } 8502fae9e5aSGreg Kroah-Hartman dev->minor = interface->minor; 8512fae9e5aSGreg Kroah-Hartman 8522fae9e5aSGreg Kroah-Hartman /* let the user know what node this device is now attached to */ 8532fae9e5aSGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " 8542fae9e5aSGreg Kroah-Hartman "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), 8552fae9e5aSGreg Kroah-Hartman USB_MAJOR, dev->minor); 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvalds exit: 8580bd193d6SMaksim Salau kfree(get_version_reply); 8591da177e4SLinus Torvalds return retval; 8601da177e4SLinus Torvalds 8611da177e4SLinus Torvalds error: 862942a4873SMaksim Salau kfree(get_version_reply); 8631da177e4SLinus Torvalds tower_delete(dev); 8641da177e4SLinus Torvalds return retval; 8651da177e4SLinus Torvalds } 8661da177e4SLinus Torvalds 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds /** 8691da177e4SLinus Torvalds * tower_disconnect 8701da177e4SLinus Torvalds * 8711da177e4SLinus Torvalds * Called by the usb core when the device is removed from the system. 8721da177e4SLinus Torvalds */ 8731da177e4SLinus Torvalds static void tower_disconnect(struct usb_interface *interface) 8741da177e4SLinus Torvalds { 8751da177e4SLinus Torvalds struct lego_usb_tower *dev; 8761da177e4SLinus Torvalds int minor; 8771da177e4SLinus Torvalds 8781da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds minor = dev->minor; 8811da177e4SLinus Torvalds 88233a78132SJohan Hovold /* give back our minor and prevent further open() */ 8831da177e4SLinus Torvalds usb_deregister_dev(interface, &tower_class); 8841da177e4SLinus Torvalds 885cd81e6faSJohan Hovold /* stop I/O */ 886cd81e6faSJohan Hovold usb_poison_urb(dev->interrupt_in_urb); 887cd81e6faSJohan Hovold usb_poison_urb(dev->interrupt_out_urb); 888cd81e6faSJohan Hovold 88918bcbcfeSDaniel Walker mutex_lock(&dev->lock); 890d4ead16fSAlan Stern 8911da177e4SLinus Torvalds /* if the device is not opened, then we clean up right now */ 8921da177e4SLinus Torvalds if (!dev->open_count) { 89318bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 8941da177e4SLinus Torvalds tower_delete(dev); 8951da177e4SLinus Torvalds } else { 896cd81e6faSJohan Hovold dev->disconnected = 1; 897d35b4ce1SOliver Neukum /* wake up pollers */ 898d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->read_wait); 899d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->write_wait); 90018bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 9011da177e4SLinus Torvalds } 9021da177e4SLinus Torvalds 9031b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n", 9041b29a375SGreg Kroah-Hartman (minor - LEGO_USB_TOWER_MINOR_BASE)); 9051da177e4SLinus Torvalds } 9061da177e4SLinus Torvalds 90765db4305SGreg Kroah-Hartman module_usb_driver(tower_driver); 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds MODULE_AUTHOR(DRIVER_AUTHOR); 9101da177e4SLinus Torvalds MODULE_DESCRIPTION(DRIVER_DESC); 9111da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 912