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 { 1601da177e4SLinus Torvalds __le16 size; /* little-endian */ 1611da177e4SLinus Torvalds __u8 err_code; 1621da177e4SLinus Torvalds __u8 spare; 1631da177e4SLinus Torvalds } __attribute__ ((packed)); 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds struct tower_get_version_reply { 1661da177e4SLinus Torvalds __le16 size; /* little-endian */ 1671da177e4SLinus Torvalds __u8 err_code; 1681da177e4SLinus Torvalds __u8 spare; 1691da177e4SLinus Torvalds __u8 major; 1701da177e4SLinus Torvalds __u8 minor; 1711da177e4SLinus Torvalds __le16 build_no; /* little-endian */ 1721da177e4SLinus Torvalds } __attribute__ ((packed)); 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 */ 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds char* read_buffer; 1951da177e4SLinus Torvalds size_t read_buffer_length; /* this much came in */ 1961da177e4SLinus Torvalds size_t read_packet_length; /* this much will be returned on read */ 1971da177e4SLinus Torvalds spinlock_t read_buffer_lock; 1981da177e4SLinus Torvalds int packet_timeout_jiffies; 1991da177e4SLinus Torvalds unsigned long read_last_arrival; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds wait_queue_head_t read_wait; 2021da177e4SLinus Torvalds wait_queue_head_t write_wait; 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds char* interrupt_in_buffer; 2051da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_in_endpoint; 2061da177e4SLinus Torvalds struct urb* interrupt_in_urb; 2071da177e4SLinus Torvalds int interrupt_in_interval; 2081da177e4SLinus Torvalds int interrupt_in_running; 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_abort_transfers (struct lego_usb_tower *dev); 2301da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev); 2317d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb); 2327d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb); 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); 2351da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface); 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds /* file operations needed when we register this driver */ 239066202ddSLuiz Fernando N. Capitulino static const struct file_operations tower_fops = { 2401da177e4SLinus Torvalds .owner = THIS_MODULE, 2411da177e4SLinus Torvalds .read = tower_read, 2421da177e4SLinus Torvalds .write = tower_write, 2431da177e4SLinus Torvalds .open = tower_open, 2441da177e4SLinus Torvalds .release = tower_release, 2451da177e4SLinus Torvalds .poll = tower_poll, 2461da177e4SLinus Torvalds .llseek = tower_llseek, 2471da177e4SLinus Torvalds }; 2481da177e4SLinus Torvalds 2492c9ede55SAl Viro static char *legousbtower_devnode(struct device *dev, umode_t *mode) 250f7a386c5SKay Sievers { 251f7a386c5SKay Sievers return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 252f7a386c5SKay Sievers } 253f7a386c5SKay Sievers 2541da177e4SLinus Torvalds /* 2551da177e4SLinus Torvalds * usb class driver info in order to get a minor number from the usb core, 256d6e5bcf4SGreg Kroah-Hartman * and to have the device registered with the driver core 2571da177e4SLinus Torvalds */ 2581da177e4SLinus Torvalds static struct usb_class_driver tower_class = { 259d6e5bcf4SGreg Kroah-Hartman .name = "legousbtower%d", 260e454cea2SKay Sievers .devnode = legousbtower_devnode, 2611da177e4SLinus Torvalds .fops = &tower_fops, 2621da177e4SLinus Torvalds .minor_base = LEGO_USB_TOWER_MINOR_BASE, 2631da177e4SLinus Torvalds }; 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds /* usb specific object needed to register this driver with the usb subsystem */ 2671da177e4SLinus Torvalds static struct usb_driver tower_driver = { 2681da177e4SLinus Torvalds .name = "legousbtower", 2691da177e4SLinus Torvalds .probe = tower_probe, 2701da177e4SLinus Torvalds .disconnect = tower_disconnect, 2711da177e4SLinus Torvalds .id_table = tower_table, 2721da177e4SLinus Torvalds }; 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds /** 2761da177e4SLinus Torvalds * lego_usb_tower_debug_data 2771da177e4SLinus Torvalds */ 2784dae9963SGreg Kroah-Hartman static inline void lego_usb_tower_debug_data(struct device *dev, 2794dae9963SGreg Kroah-Hartman const char *function, int size, 2804dae9963SGreg Kroah-Hartman const unsigned char *data) 2811da177e4SLinus Torvalds { 2824dae9963SGreg Kroah-Hartman dev_dbg(dev, "%s - length = %d, data = %*ph\n", 2834dae9963SGreg Kroah-Hartman function, size, size, data); 2841da177e4SLinus Torvalds } 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds /** 2881da177e4SLinus Torvalds * tower_delete 2891da177e4SLinus Torvalds */ 2901da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev) 2911da177e4SLinus Torvalds { 2921da177e4SLinus Torvalds tower_abort_transfers (dev); 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /* free data structures */ 2951da177e4SLinus Torvalds usb_free_urb(dev->interrupt_in_urb); 2961da177e4SLinus Torvalds usb_free_urb(dev->interrupt_out_urb); 2971da177e4SLinus Torvalds kfree (dev->read_buffer); 2981da177e4SLinus Torvalds kfree (dev->interrupt_in_buffer); 2991da177e4SLinus Torvalds kfree (dev->interrupt_out_buffer); 3001da177e4SLinus Torvalds kfree (dev); 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds /** 3051da177e4SLinus Torvalds * tower_open 3061da177e4SLinus Torvalds */ 3071da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file) 3081da177e4SLinus Torvalds { 3091da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 3101da177e4SLinus Torvalds int subminor; 3111da177e4SLinus Torvalds int retval = 0; 3121da177e4SLinus Torvalds struct usb_interface *interface; 313942a4873SMaksim Salau struct tower_reset_reply *reset_reply; 3141da177e4SLinus Torvalds int result; 3151da177e4SLinus Torvalds 316942a4873SMaksim Salau reset_reply = kmalloc(sizeof(*reset_reply), GFP_KERNEL); 317942a4873SMaksim Salau 318942a4873SMaksim Salau if (!reset_reply) { 319942a4873SMaksim Salau retval = -ENOMEM; 320942a4873SMaksim Salau goto exit; 321942a4873SMaksim Salau } 322942a4873SMaksim Salau 3231da177e4SLinus Torvalds nonseekable_open(inode, file); 3241da177e4SLinus Torvalds subminor = iminor(inode); 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds interface = usb_find_interface (&tower_driver, subminor); 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds if (!interface) { 32938726bf5SGreg Kroah-Hartman pr_err("error, can't find device for minor %d\n", subminor); 3301da177e4SLinus Torvalds retval = -ENODEV; 331d4ead16fSAlan Stern goto exit; 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 3351da177e4SLinus Torvalds if (!dev) { 3361da177e4SLinus Torvalds retval = -ENODEV; 337d4ead16fSAlan Stern goto exit; 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds /* lock this device */ 34118bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 3421da177e4SLinus Torvalds retval = -ERESTARTSYS; 343d4ead16fSAlan Stern goto exit; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 34678663eccSOliver Neukum 3471da177e4SLinus Torvalds /* allow opening only once */ 3481da177e4SLinus Torvalds if (dev->open_count) { 3491da177e4SLinus Torvalds retval = -EBUSY; 3501da177e4SLinus Torvalds goto unlock_exit; 3511da177e4SLinus Torvalds } 3521da177e4SLinus Torvalds dev->open_count = 1; 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds /* reset the tower */ 3551da177e4SLinus Torvalds result = usb_control_msg (dev->udev, 3561da177e4SLinus Torvalds usb_rcvctrlpipe(dev->udev, 0), 3571da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_RESET, 3581da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 3591da177e4SLinus Torvalds 0, 3601da177e4SLinus Torvalds 0, 361942a4873SMaksim Salau reset_reply, 362942a4873SMaksim Salau sizeof(*reset_reply), 3631da177e4SLinus Torvalds 1000); 3641da177e4SLinus Torvalds if (result < 0) { 3659d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3669d974b2aSGreg Kroah-Hartman "LEGO USB Tower reset control request failed\n"); 3671da177e4SLinus Torvalds retval = result; 3681da177e4SLinus Torvalds goto unlock_exit; 3691da177e4SLinus Torvalds } 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds /* initialize in direction */ 3721da177e4SLinus Torvalds dev->read_buffer_length = 0; 3731da177e4SLinus Torvalds dev->read_packet_length = 0; 3741da177e4SLinus Torvalds usb_fill_int_urb (dev->interrupt_in_urb, 3751da177e4SLinus Torvalds dev->udev, 3761da177e4SLinus Torvalds usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), 3771da177e4SLinus Torvalds dev->interrupt_in_buffer, 37829cc8897SKuninori Morimoto usb_endpoint_maxp(dev->interrupt_in_endpoint), 3791da177e4SLinus Torvalds tower_interrupt_in_callback, 3801da177e4SLinus Torvalds dev, 3811da177e4SLinus Torvalds dev->interrupt_in_interval); 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds dev->interrupt_in_running = 1; 3841da177e4SLinus Torvalds dev->interrupt_in_done = 0; 3851da177e4SLinus Torvalds mb(); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); 3881da177e4SLinus Torvalds if (retval) { 3899d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3909d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_in_urb %d\n", retval); 3911da177e4SLinus Torvalds dev->interrupt_in_running = 0; 3921da177e4SLinus Torvalds dev->open_count = 0; 3931da177e4SLinus Torvalds goto unlock_exit; 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds /* save device in the file's private structure */ 3971da177e4SLinus Torvalds file->private_data = dev; 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds unlock_exit: 40018bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4011da177e4SLinus Torvalds 402d4ead16fSAlan Stern exit: 403942a4873SMaksim Salau kfree(reset_reply); 4041da177e4SLinus Torvalds return retval; 4051da177e4SLinus Torvalds } 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds /** 4081da177e4SLinus Torvalds * tower_release 4091da177e4SLinus Torvalds */ 4101da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds struct lego_usb_tower *dev; 4131da177e4SLinus Torvalds int retval = 0; 4141da177e4SLinus Torvalds 4155bd6e8b3SJoe Perches dev = file->private_data; 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds if (dev == NULL) { 4181da177e4SLinus Torvalds retval = -ENODEV; 41933a78132SJohan Hovold goto exit; 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds 42218bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 4231da177e4SLinus Torvalds retval = -ERESTARTSYS; 4241da177e4SLinus Torvalds goto exit; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds if (dev->open_count != 1) { 428fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: device not opened exactly once\n", 429fef526caSGreg Kroah-Hartman __func__); 4301da177e4SLinus Torvalds retval = -ENODEV; 4311da177e4SLinus Torvalds goto unlock_exit; 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds if (dev->udev == NULL) { 4341da177e4SLinus Torvalds /* the device was unplugged before the file was released */ 43518bcbcfeSDaniel Walker 43618bcbcfeSDaniel Walker /* unlock here as tower_delete frees dev */ 43718bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4381da177e4SLinus Torvalds tower_delete (dev); 4391da177e4SLinus Torvalds goto exit; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* wait until write transfer is finished */ 4431da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 4441da177e4SLinus Torvalds wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds tower_abort_transfers (dev); 4471da177e4SLinus Torvalds dev->open_count = 0; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds unlock_exit: 45018bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4511da177e4SLinus Torvalds exit: 4521da177e4SLinus Torvalds return retval; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /** 4571da177e4SLinus Torvalds * tower_abort_transfers 4581da177e4SLinus Torvalds * aborts transfers and frees associated data structures 4591da177e4SLinus Torvalds */ 4601da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev) 4611da177e4SLinus Torvalds { 462fef526caSGreg Kroah-Hartman if (dev == NULL) 463d26f6e57SGreg Kroah-Hartman return; 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds /* shutdown transfer */ 4661da177e4SLinus Torvalds if (dev->interrupt_in_running) { 4671da177e4SLinus Torvalds dev->interrupt_in_running = 0; 4681da177e4SLinus Torvalds mb(); 469f53510e8SMariusz Kozlowski if (dev->udev) 4701da177e4SLinus Torvalds usb_kill_urb (dev->interrupt_in_urb); 4711da177e4SLinus Torvalds } 472f53510e8SMariusz Kozlowski if (dev->interrupt_out_busy && dev->udev) 4731da177e4SLinus Torvalds usb_kill_urb(dev->interrupt_out_urb); 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds /** 4781da177e4SLinus Torvalds * tower_check_for_read_packet 4791da177e4SLinus Torvalds * 4801da177e4SLinus Torvalds * To get correct semantics for signals and non-blocking I/O 4811da177e4SLinus Torvalds * with packetizing we pretend not to see any data in the read buffer 4821da177e4SLinus Torvalds * until it has been there unchanged for at least 4831da177e4SLinus Torvalds * dev->packet_timeout_jiffies, or until the buffer is full. 4841da177e4SLinus Torvalds */ 4851da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev) 4861da177e4SLinus Torvalds { 4871da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 4881da177e4SLinus Torvalds if (!packet_timeout 4891da177e4SLinus Torvalds || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) 4901da177e4SLinus Torvalds || dev->read_buffer_length == read_buffer_size) { 4911da177e4SLinus Torvalds dev->read_packet_length = dev->read_buffer_length; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds dev->interrupt_in_done = 0; 4941da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 4951da177e4SLinus Torvalds } 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds /** 4991da177e4SLinus Torvalds * tower_poll 5001da177e4SLinus Torvalds */ 501afc9a42bSAl Viro static __poll_t tower_poll (struct file *file, poll_table *wait) 5021da177e4SLinus Torvalds { 5031da177e4SLinus Torvalds struct lego_usb_tower *dev; 504afc9a42bSAl Viro __poll_t mask = 0; 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds dev = file->private_data; 5071da177e4SLinus Torvalds 508d35b4ce1SOliver Neukum if (!dev->udev) 509a9a08845SLinus Torvalds return EPOLLERR | EPOLLHUP; 510d35b4ce1SOliver Neukum 5111da177e4SLinus Torvalds poll_wait(file, &dev->read_wait, wait); 5121da177e4SLinus Torvalds poll_wait(file, &dev->write_wait, wait); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5151da177e4SLinus Torvalds if (dev->read_packet_length > 0) { 516a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds if (!dev->interrupt_out_busy) { 519a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 5201da177e4SLinus Torvalds } 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds return mask; 5231da177e4SLinus Torvalds } 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds /** 5271da177e4SLinus Torvalds * tower_llseek 5281da177e4SLinus Torvalds */ 5291da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence) 5301da177e4SLinus Torvalds { 5311da177e4SLinus Torvalds return -ESPIPE; /* unseekable */ 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /** 5361da177e4SLinus Torvalds * tower_read 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds struct lego_usb_tower *dev; 5411da177e4SLinus Torvalds size_t bytes_to_read; 5421da177e4SLinus Torvalds int i; 5431da177e4SLinus Torvalds int retval = 0; 5441da177e4SLinus Torvalds unsigned long timeout = 0; 5451da177e4SLinus Torvalds 5465bd6e8b3SJoe Perches dev = file->private_data; 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds /* lock this object */ 54918bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 5501da177e4SLinus Torvalds retval = -ERESTARTSYS; 5511da177e4SLinus Torvalds goto exit; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 5551da177e4SLinus Torvalds if (dev->udev == NULL) { 5561da177e4SLinus Torvalds retval = -ENODEV; 55738726bf5SGreg Kroah-Hartman pr_err("No device or device unplugged %d\n", retval); 5581da177e4SLinus Torvalds goto unlock_exit; 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds /* verify that we actually have some data to read */ 5621da177e4SLinus Torvalds if (count == 0) { 563fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "read request of 0 bytes\n"); 5641da177e4SLinus Torvalds goto unlock_exit; 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds if (read_timeout) { 5688f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds /* wait for data */ 5721da177e4SLinus Torvalds tower_check_for_read_packet (dev); 5731da177e4SLinus Torvalds while (dev->read_packet_length == 0) { 5741da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 5751da177e4SLinus Torvalds retval = -EAGAIN; 5761da177e4SLinus Torvalds goto unlock_exit; 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); 5791da177e4SLinus Torvalds if (retval < 0) { 5801da177e4SLinus Torvalds goto unlock_exit; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds /* reset read timeout during read or write activity */ 5841da177e4SLinus Torvalds if (read_timeout 5851da177e4SLinus Torvalds && (dev->read_buffer_length || dev->interrupt_out_busy)) { 5868f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds /* check for read timeout */ 5891da177e4SLinus Torvalds if (read_timeout && time_after (jiffies, timeout)) { 5901da177e4SLinus Torvalds retval = -ETIMEDOUT; 5911da177e4SLinus Torvalds goto unlock_exit; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds tower_check_for_read_packet (dev); 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvalds /* copy the data from read_buffer into userspace */ 5971da177e4SLinus Torvalds bytes_to_read = min(count, dev->read_packet_length); 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { 6001da177e4SLinus Torvalds retval = -EFAULT; 6011da177e4SLinus Torvalds goto unlock_exit; 6021da177e4SLinus Torvalds } 6031da177e4SLinus Torvalds 6041da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 6051da177e4SLinus Torvalds dev->read_buffer_length -= bytes_to_read; 6061da177e4SLinus Torvalds dev->read_packet_length -= bytes_to_read; 6071da177e4SLinus Torvalds for (i=0; i<dev->read_buffer_length; i++) { 6081da177e4SLinus Torvalds dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds retval = bytes_to_read; 6131da177e4SLinus Torvalds 6141da177e4SLinus Torvalds unlock_exit: 6151da177e4SLinus Torvalds /* unlock the device */ 61618bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds exit: 6191da177e4SLinus Torvalds return retval; 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds /** 6241da177e4SLinus Torvalds * tower_write 6251da177e4SLinus Torvalds */ 6261da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 6271da177e4SLinus Torvalds { 6281da177e4SLinus Torvalds struct lego_usb_tower *dev; 6291da177e4SLinus Torvalds size_t bytes_to_write; 6301da177e4SLinus Torvalds int retval = 0; 6311da177e4SLinus Torvalds 6325bd6e8b3SJoe Perches dev = file->private_data; 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* lock this object */ 63518bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 6361da177e4SLinus Torvalds retval = -ERESTARTSYS; 6371da177e4SLinus Torvalds goto exit; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6411da177e4SLinus Torvalds if (dev->udev == NULL) { 6421da177e4SLinus Torvalds retval = -ENODEV; 64338726bf5SGreg Kroah-Hartman pr_err("No device or device unplugged %d\n", retval); 6441da177e4SLinus Torvalds goto unlock_exit; 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds /* verify that we actually have some data to write */ 6481da177e4SLinus Torvalds if (count == 0) { 649fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "write request of 0 bytes\n"); 6501da177e4SLinus Torvalds goto unlock_exit; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvalds /* wait until previous transfer is finished */ 6541da177e4SLinus Torvalds while (dev->interrupt_out_busy) { 6551da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 6561da177e4SLinus Torvalds retval = -EAGAIN; 6571da177e4SLinus Torvalds goto unlock_exit; 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); 6601da177e4SLinus Torvalds if (retval) { 6611da177e4SLinus Torvalds goto unlock_exit; 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds /* write the data into interrupt_out_buffer from userspace */ 6661da177e4SLinus Torvalds bytes_to_write = min_t(int, count, write_buffer_size); 6675b5e0928SAlexey Dobriyan dev_dbg(&dev->udev->dev, "%s: count = %zd, bytes_to_write = %zd\n", 668fef526caSGreg Kroah-Hartman __func__, count, bytes_to_write); 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { 6711da177e4SLinus Torvalds retval = -EFAULT; 6721da177e4SLinus Torvalds goto unlock_exit; 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* send off the urb */ 6761da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_out_urb, 6771da177e4SLinus Torvalds dev->udev, 6781da177e4SLinus Torvalds usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 6791da177e4SLinus Torvalds dev->interrupt_out_buffer, 6801da177e4SLinus Torvalds bytes_to_write, 6811da177e4SLinus Torvalds tower_interrupt_out_callback, 6821da177e4SLinus Torvalds dev, 6831da177e4SLinus Torvalds dev->interrupt_out_interval); 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds dev->interrupt_out_busy = 1; 6861da177e4SLinus Torvalds wmb(); 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); 6891da177e4SLinus Torvalds if (retval) { 6901da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 6919d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 6929d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_out_urb %d\n", retval); 6931da177e4SLinus Torvalds goto unlock_exit; 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds retval = bytes_to_write; 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds unlock_exit: 6981da177e4SLinus Torvalds /* unlock the device */ 69918bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds exit: 7021da177e4SLinus Torvalds return retval; 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds /** 7071da177e4SLinus Torvalds * tower_interrupt_in_callback 7081da177e4SLinus Torvalds */ 7097d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb) 7101da177e4SLinus Torvalds { 711cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 71264771a0fSGreg Kroah-Hartman int status = urb->status; 7131da177e4SLinus Torvalds int retval; 7144327059aSSebastian Andrzej Siewior unsigned long flags; 7151da177e4SLinus Torvalds 7164dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7174dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7181da177e4SLinus Torvalds 71964771a0fSGreg Kroah-Hartman if (status) { 72064771a0fSGreg Kroah-Hartman if (status == -ENOENT || 72164771a0fSGreg Kroah-Hartman status == -ECONNRESET || 72264771a0fSGreg Kroah-Hartman status == -ESHUTDOWN) { 7231da177e4SLinus Torvalds goto exit; 7241da177e4SLinus Torvalds } else { 725fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 726fef526caSGreg Kroah-Hartman "%s: nonzero status received: %d\n", __func__, 727fef526caSGreg Kroah-Hartman status); 7281da177e4SLinus Torvalds goto resubmit; /* maybe we can recover */ 7291da177e4SLinus Torvalds } 7301da177e4SLinus Torvalds } 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds if (urb->actual_length > 0) { 7334327059aSSebastian Andrzej Siewior spin_lock_irqsave(&dev->read_buffer_lock, flags); 7341da177e4SLinus Torvalds if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { 7351da177e4SLinus Torvalds memcpy (dev->read_buffer + dev->read_buffer_length, 7361da177e4SLinus Torvalds dev->interrupt_in_buffer, 7371da177e4SLinus Torvalds urb->actual_length); 7381da177e4SLinus Torvalds dev->read_buffer_length += urb->actual_length; 7391da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 740fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: received %d bytes\n", 741fef526caSGreg Kroah-Hartman __func__, urb->actual_length); 7421da177e4SLinus Torvalds } else { 74338726bf5SGreg Kroah-Hartman pr_warn("read_buffer overflow, %d bytes dropped\n", 74438726bf5SGreg Kroah-Hartman urb->actual_length); 7451da177e4SLinus Torvalds } 7464327059aSSebastian Andrzej Siewior spin_unlock_irqrestore(&dev->read_buffer_lock, flags); 7471da177e4SLinus Torvalds } 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds resubmit: 7501da177e4SLinus Torvalds /* resubmit if we're still running */ 7511da177e4SLinus Torvalds if (dev->interrupt_in_running && dev->udev) { 7521da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); 7539d974b2aSGreg Kroah-Hartman if (retval) 7549d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 7559d974b2aSGreg Kroah-Hartman "%s: usb_submit_urb failed (%d)\n", 7569d974b2aSGreg Kroah-Hartman __func__, retval); 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds exit: 7601da177e4SLinus Torvalds dev->interrupt_in_done = 1; 7611da177e4SLinus Torvalds wake_up_interruptible (&dev->read_wait); 7621da177e4SLinus Torvalds } 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds /** 7661da177e4SLinus Torvalds * tower_interrupt_out_callback 7671da177e4SLinus Torvalds */ 7687d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb) 7691da177e4SLinus Torvalds { 770cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 77164771a0fSGreg Kroah-Hartman int status = urb->status; 7721da177e4SLinus Torvalds 7734dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7744dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /* sync/async unlink faults aren't errors */ 77764771a0fSGreg Kroah-Hartman if (status && !(status == -ENOENT || 77864771a0fSGreg Kroah-Hartman status == -ECONNRESET || 77964771a0fSGreg Kroah-Hartman status == -ESHUTDOWN)) { 780fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 781fef526caSGreg Kroah-Hartman "%s: nonzero write bulk status received: %d\n", __func__, 782fef526caSGreg Kroah-Hartman status); 7831da177e4SLinus Torvalds } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7861da177e4SLinus Torvalds wake_up_interruptible(&dev->write_wait); 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /** 7911da177e4SLinus Torvalds * tower_probe 7921da177e4SLinus Torvalds * 7931da177e4SLinus Torvalds * Called by the usb core when a new device is connected that it thinks 7941da177e4SLinus Torvalds * this driver might be interested in. 7951da177e4SLinus Torvalds */ 7961da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id) 7971da177e4SLinus Torvalds { 7989d974b2aSGreg Kroah-Hartman struct device *idev = &interface->dev; 7991da177e4SLinus Torvalds struct usb_device *udev = interface_to_usbdev(interface); 8001da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 801942a4873SMaksim Salau struct tower_get_version_reply *get_version_reply = NULL; 8021da177e4SLinus Torvalds int retval = -ENOMEM; 8031da177e4SLinus Torvalds int result; 8041da177e4SLinus Torvalds 805093cf723SSteven Cole /* allocate memory for our device state and initialize it */ 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvalds dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); 8081da177e4SLinus Torvalds 80949d8ffabSWolfram Sang if (!dev) 8101da177e4SLinus Torvalds goto exit; 8111da177e4SLinus Torvalds 81218bcbcfeSDaniel Walker mutex_init(&dev->lock); 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds dev->udev = udev; 8151da177e4SLinus Torvalds dev->open_count = 0; 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds dev->read_buffer = NULL; 8181da177e4SLinus Torvalds dev->read_buffer_length = 0; 8191da177e4SLinus Torvalds dev->read_packet_length = 0; 8201da177e4SLinus Torvalds spin_lock_init (&dev->read_buffer_lock); 8218f7e9473SNicholas Mc Guire dev->packet_timeout_jiffies = msecs_to_jiffies(packet_timeout); 8221da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 8231da177e4SLinus Torvalds 8241da177e4SLinus Torvalds init_waitqueue_head (&dev->read_wait); 8251da177e4SLinus Torvalds init_waitqueue_head (&dev->write_wait); 8261da177e4SLinus Torvalds 8271da177e4SLinus Torvalds dev->interrupt_in_buffer = NULL; 8281da177e4SLinus Torvalds dev->interrupt_in_endpoint = NULL; 8291da177e4SLinus Torvalds dev->interrupt_in_urb = NULL; 8301da177e4SLinus Torvalds dev->interrupt_in_running = 0; 8311da177e4SLinus Torvalds dev->interrupt_in_done = 0; 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds dev->interrupt_out_buffer = NULL; 8341da177e4SLinus Torvalds dev->interrupt_out_endpoint = NULL; 8351da177e4SLinus Torvalds dev->interrupt_out_urb = NULL; 8361da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 8371da177e4SLinus Torvalds 8389b181166SJohan Hovold result = usb_find_common_endpoints_reverse(interface->cur_altsetting, 8399b181166SJohan Hovold NULL, NULL, 8409b181166SJohan Hovold &dev->interrupt_in_endpoint, 8419b181166SJohan Hovold &dev->interrupt_out_endpoint); 8429b181166SJohan Hovold if (result) { 8439b181166SJohan Hovold dev_err(idev, "interrupt endpoints not found\n"); 8449b181166SJohan Hovold retval = result; 8451da177e4SLinus Torvalds goto error; 8461da177e4SLinus Torvalds } 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); 84949d8ffabSWolfram Sang if (!dev->read_buffer) 8501da177e4SLinus Torvalds goto error; 85129cc8897SKuninori Morimoto dev->interrupt_in_buffer = kmalloc (usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL); 85249d8ffabSWolfram Sang if (!dev->interrupt_in_buffer) 8531da177e4SLinus Torvalds goto error; 8541da177e4SLinus Torvalds dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 855a131f41fSWolfram Sang if (!dev->interrupt_in_urb) 8561da177e4SLinus Torvalds goto error; 8571da177e4SLinus Torvalds dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); 85849d8ffabSWolfram Sang if (!dev->interrupt_out_buffer) 8591da177e4SLinus Torvalds goto error; 8601da177e4SLinus Torvalds dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 861a131f41fSWolfram Sang if (!dev->interrupt_out_urb) 8621da177e4SLinus Torvalds goto error; 8631da177e4SLinus Torvalds dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 8641da177e4SLinus Torvalds dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 8651da177e4SLinus Torvalds 866942a4873SMaksim Salau get_version_reply = kmalloc(sizeof(*get_version_reply), GFP_KERNEL); 867942a4873SMaksim Salau 868942a4873SMaksim Salau if (!get_version_reply) { 869942a4873SMaksim Salau retval = -ENOMEM; 870942a4873SMaksim Salau goto error; 871942a4873SMaksim Salau } 872942a4873SMaksim Salau 8731da177e4SLinus Torvalds /* get the firmware version and log it */ 8741da177e4SLinus Torvalds result = usb_control_msg (udev, 8751da177e4SLinus Torvalds usb_rcvctrlpipe(udev, 0), 8761da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_GET_VERSION, 8771da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 8781da177e4SLinus Torvalds 0, 8791da177e4SLinus Torvalds 0, 880942a4873SMaksim Salau get_version_reply, 881942a4873SMaksim Salau sizeof(*get_version_reply), 8821da177e4SLinus Torvalds 1000); 8831d427be4SJohan Hovold if (result < sizeof(*get_version_reply)) { 8841d427be4SJohan Hovold if (result >= 0) 8851d427be4SJohan Hovold result = -EIO; 8861d427be4SJohan Hovold dev_err(idev, "get version request failed: %d\n", result); 8871da177e4SLinus Torvalds retval = result; 8881da177e4SLinus Torvalds goto error; 8891da177e4SLinus Torvalds } 890942a4873SMaksim Salau dev_info(&interface->dev, 891942a4873SMaksim Salau "LEGO USB Tower firmware version is %d.%d build %d\n", 892942a4873SMaksim Salau get_version_reply->major, 893942a4873SMaksim Salau get_version_reply->minor, 894942a4873SMaksim Salau le16_to_cpu(get_version_reply->build_no)); 8951da177e4SLinus Torvalds 8962fae9e5aSGreg Kroah-Hartman /* we can register the device now, as it is ready */ 8972fae9e5aSGreg Kroah-Hartman usb_set_intfdata (interface, dev); 8982fae9e5aSGreg Kroah-Hartman 8992fae9e5aSGreg Kroah-Hartman retval = usb_register_dev (interface, &tower_class); 9002fae9e5aSGreg Kroah-Hartman 9012fae9e5aSGreg Kroah-Hartman if (retval) { 9022fae9e5aSGreg Kroah-Hartman /* something prevented us from registering this driver */ 9032fae9e5aSGreg Kroah-Hartman dev_err(idev, "Not able to get a minor for this device.\n"); 9042fae9e5aSGreg Kroah-Hartman goto error; 9052fae9e5aSGreg Kroah-Hartman } 9062fae9e5aSGreg Kroah-Hartman dev->minor = interface->minor; 9072fae9e5aSGreg Kroah-Hartman 9082fae9e5aSGreg Kroah-Hartman /* let the user know what node this device is now attached to */ 9092fae9e5aSGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " 9102fae9e5aSGreg Kroah-Hartman "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), 9112fae9e5aSGreg Kroah-Hartman USB_MAJOR, dev->minor); 9121da177e4SLinus Torvalds 9131da177e4SLinus Torvalds exit: 9140bd193d6SMaksim Salau kfree(get_version_reply); 9151da177e4SLinus Torvalds return retval; 9161da177e4SLinus Torvalds 9171da177e4SLinus Torvalds error: 918942a4873SMaksim Salau kfree(get_version_reply); 9191da177e4SLinus Torvalds tower_delete(dev); 9201da177e4SLinus Torvalds return retval; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds /** 9251da177e4SLinus Torvalds * tower_disconnect 9261da177e4SLinus Torvalds * 9271da177e4SLinus Torvalds * Called by the usb core when the device is removed from the system. 9281da177e4SLinus Torvalds */ 9291da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface) 9301da177e4SLinus Torvalds { 9311da177e4SLinus Torvalds struct lego_usb_tower *dev; 9321da177e4SLinus Torvalds int minor; 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds dev = usb_get_intfdata (interface); 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds minor = dev->minor; 9371da177e4SLinus Torvalds 93833a78132SJohan Hovold /* give back our minor and prevent further open() */ 9391da177e4SLinus Torvalds usb_deregister_dev (interface, &tower_class); 9401da177e4SLinus Torvalds 94118bcbcfeSDaniel Walker mutex_lock(&dev->lock); 942d4ead16fSAlan Stern 9431da177e4SLinus Torvalds /* if the device is not opened, then we clean up right now */ 9441da177e4SLinus Torvalds if (!dev->open_count) { 94518bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 9461da177e4SLinus Torvalds tower_delete (dev); 9471da177e4SLinus Torvalds } else { 9481da177e4SLinus Torvalds dev->udev = NULL; 949d35b4ce1SOliver Neukum /* wake up pollers */ 950d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->read_wait); 951d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->write_wait); 95218bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 9531da177e4SLinus Torvalds } 9541da177e4SLinus Torvalds 9551b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n", 9561b29a375SGreg Kroah-Hartman (minor - LEGO_USB_TOWER_MINOR_BASE)); 9571da177e4SLinus Torvalds } 9581da177e4SLinus Torvalds 95965db4305SGreg Kroah-Hartman module_usb_driver(tower_driver); 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds MODULE_AUTHOR(DRIVER_AUTHOR); 9621da177e4SLinus Torvalds MODULE_DESCRIPTION(DRIVER_DESC); 9631da177e4SLinus Torvalds #ifdef MODULE_LICENSE 9641da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 9651da177e4SLinus Torvalds #endif 966