11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * LEGO USB Tower driver 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net> 51da177e4SLinus Torvalds * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 81da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License as 91da177e4SLinus Torvalds * published by the Free Software Foundation; either version 2 of 101da177e4SLinus Torvalds * the License, or (at your option) any later version. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * derived from USB Skeleton driver - 0.5 131da177e4SLinus Torvalds * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * History: 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * 2001-10-13 - 0.1 js 181da177e4SLinus Torvalds * - first version 191da177e4SLinus Torvalds * 2001-11-03 - 0.2 js 201da177e4SLinus Torvalds * - simplified buffering, one-shot URBs for writing 211da177e4SLinus Torvalds * 2001-11-10 - 0.3 js 221da177e4SLinus Torvalds * - removed IOCTL (setting power/mode is more complicated, postponed) 231da177e4SLinus Torvalds * 2001-11-28 - 0.4 js 241da177e4SLinus Torvalds * - added vendor commands for mode of operation and power level in open 251da177e4SLinus Torvalds * 2001-12-04 - 0.5 js 261da177e4SLinus Torvalds * - set IR mode by default (by oversight 0.4 set VLL mode) 271da177e4SLinus Torvalds * 2002-01-11 - 0.5? pcchan 281da177e4SLinus Torvalds * - make read buffer reusable and work around bytes_to_write issue between 291da177e4SLinus Torvalds * uhci and legusbtower 301da177e4SLinus Torvalds * 2002-09-23 - 0.52 david (david@csse.uwa.edu.au) 311da177e4SLinus Torvalds * - imported into lejos project 321da177e4SLinus Torvalds * - changed wake_up to wake_up_interruptible 331da177e4SLinus Torvalds * - changed to use lego0 rather than tower0 34441b62c1SHarvey Harrison * - changed dbg() to use __func__ rather than deprecated __func__ 351da177e4SLinus Torvalds * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au) 361da177e4SLinus Torvalds * - changed read and write to write everything or 371da177e4SLinus Torvalds * timeout (from a patch by Chris Riesen and Brett Thaeler driver) 381da177e4SLinus Torvalds * - added ioctl functionality to set timeouts 391da177e4SLinus Torvalds * 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au) 401da177e4SLinus Torvalds * - initial import into LegoUSB project 411da177e4SLinus Torvalds * - merge of existing LegoUSB.c driver 421da177e4SLinus Torvalds * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au) 431da177e4SLinus Torvalds * - port to 2.6 style driver 441da177e4SLinus Torvalds * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net> 451da177e4SLinus Torvalds * - fix locking 461da177e4SLinus Torvalds * - unlink read URBs which are no longer needed 471da177e4SLinus Torvalds * - allow increased buffer size, eliminates need for timeout on write 481da177e4SLinus Torvalds * - have read URB running continuously 491da177e4SLinus Torvalds * - added poll 501da177e4SLinus Torvalds * - forbid seeking 511da177e4SLinus Torvalds * - added nonblocking I/O 52441b62c1SHarvey Harrison * - changed back __func__ to __func__ 531da177e4SLinus Torvalds * - read and log tower firmware version 541da177e4SLinus Torvalds * - reset tower on probe, avoids failure of first write 551da177e4SLinus Torvalds * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net> 561da177e4SLinus Torvalds * - timeout read now only after inactivity, shorten default accordingly 571da177e4SLinus Torvalds * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net> 581da177e4SLinus Torvalds * - log major, minor instead of possibly confusing device filename 591da177e4SLinus Torvalds * - whitespace cleanup 601da177e4SLinus Torvalds * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net> 611da177e4SLinus Torvalds * - normalize whitespace in debug messages 621da177e4SLinus Torvalds * - take care about endianness in control message responses 631da177e4SLinus Torvalds * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net> 641da177e4SLinus Torvalds * - make default intervals longer to accommodate current EHCI driver 651da177e4SLinus Torvalds * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net> 661da177e4SLinus Torvalds * - replaced atomic_t by memory barriers 671da177e4SLinus Torvalds * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net> 681da177e4SLinus Torvalds * - wait for completion of write urb in release (needed for remotecontrol) 691da177e4SLinus Torvalds * - corrected poll for write direction (missing negation) 701da177e4SLinus Torvalds * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net> 711da177e4SLinus Torvalds * - make device locking interruptible 721da177e4SLinus Torvalds * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net> 731da177e4SLinus Torvalds * - check for valid udev on resubmitting and unlinking urbs 741da177e4SLinus Torvalds * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net> 751da177e4SLinus Torvalds * - move reset into open to clean out spurious data 761da177e4SLinus Torvalds */ 771da177e4SLinus Torvalds 7838726bf5SGreg Kroah-Hartman #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7938726bf5SGreg Kroah-Hartman 801da177e4SLinus Torvalds #include <linux/kernel.h> 811da177e4SLinus Torvalds #include <linux/errno.h> 821da177e4SLinus Torvalds #include <linux/slab.h> 831da177e4SLinus Torvalds #include <linux/module.h> 841da177e4SLinus Torvalds #include <linux/completion.h> 854186ecf8SArjan van de Ven #include <linux/mutex.h> 867c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 871da177e4SLinus Torvalds #include <linux/usb.h> 881da177e4SLinus Torvalds #include <linux/poll.h> 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* Version Information */ 921da177e4SLinus Torvalds #define DRIVER_VERSION "v0.96" 931da177e4SLinus Torvalds #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" 941da177e4SLinus Torvalds #define DRIVER_DESC "LEGO USB Tower Driver" 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* The defaults are chosen to work with the latest versions of leJOS and NQC. 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* Some legacy software likes to receive packets in one piece. 1011da177e4SLinus Torvalds * In this case read_buffer_size should exceed the maximal packet length 1021da177e4SLinus Torvalds * (417 for datalog uploads), and packet_timeout should be set. 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds static int read_buffer_size = 480; 1051da177e4SLinus Torvalds module_param(read_buffer_size, int, 0); 1061da177e4SLinus Torvalds MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* Some legacy software likes to send packets in one piece. 1091da177e4SLinus Torvalds * In this case write_buffer_size should exceed the maximal packet length 1101da177e4SLinus Torvalds * (417 for firmware and program downloads). 1111da177e4SLinus Torvalds * A problem with long writes is that the following read may time out 1121da177e4SLinus Torvalds * if the software is not prepared to wait long enough. 1131da177e4SLinus Torvalds */ 1141da177e4SLinus Torvalds static int write_buffer_size = 480; 1151da177e4SLinus Torvalds module_param(write_buffer_size, int, 0); 1161da177e4SLinus Torvalds MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds /* Some legacy software expects reads to contain whole LASM packets. 1191da177e4SLinus Torvalds * To achieve this, characters which arrive before a packet timeout 1201da177e4SLinus Torvalds * occurs will be returned in a single read operation. 1211da177e4SLinus Torvalds * A problem with long reads is that the software may time out 1221da177e4SLinus Torvalds * if it is not prepared to wait long enough. 1231da177e4SLinus Torvalds * The packet timeout should be greater than the time between the 1241da177e4SLinus Torvalds * reception of subsequent characters, which should arrive about 1251da177e4SLinus Torvalds * every 5ms for the standard 2400 baud. 1261da177e4SLinus Torvalds * Set it to 0 to disable. 1271da177e4SLinus Torvalds */ 1281da177e4SLinus Torvalds static int packet_timeout = 50; 1291da177e4SLinus Torvalds module_param(packet_timeout, int, 0); 1301da177e4SLinus Torvalds MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* Some legacy software expects blocking reads to time out. 1331da177e4SLinus Torvalds * Timeout occurs after the specified time of read and write inactivity. 1341da177e4SLinus Torvalds * Set it to 0 to disable. 1351da177e4SLinus Torvalds */ 1361da177e4SLinus Torvalds static int read_timeout = 200; 1371da177e4SLinus Torvalds module_param(read_timeout, int, 0); 1381da177e4SLinus Torvalds MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* As of kernel version 2.6.4 ehci-hcd uses an 1411da177e4SLinus Torvalds * "only one interrupt transfer per frame" shortcut 1421da177e4SLinus Torvalds * to simplify the scheduling of periodic transfers. 1431da177e4SLinus Torvalds * This conflicts with our standard 1ms intervals for in and out URBs. 1441da177e4SLinus Torvalds * We use default intervals of 2ms for in and 8ms for out transfers, 1451da177e4SLinus Torvalds * which is fast enough for 2400 baud and allows a small additional load. 1461da177e4SLinus Torvalds * Increase the interval to allow more devices that do interrupt transfers, 1471da177e4SLinus Torvalds * or set to 0 to use the standard interval from the endpoint descriptors. 1481da177e4SLinus Torvalds */ 1491da177e4SLinus Torvalds static int interrupt_in_interval = 2; 1501da177e4SLinus Torvalds module_param(interrupt_in_interval, int, 0); 1511da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds static int interrupt_out_interval = 8; 1541da177e4SLinus Torvalds module_param(interrupt_out_interval, int, 0); 1551da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* Define these values to match your device */ 1581da177e4SLinus Torvalds #define LEGO_USB_TOWER_VENDOR_ID 0x0694 1591da177e4SLinus Torvalds #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* Vendor requests */ 1621da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_RESET 0x04 1631da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds struct tower_reset_reply { 1661da177e4SLinus Torvalds __le16 size; /* little-endian */ 1671da177e4SLinus Torvalds __u8 err_code; 1681da177e4SLinus Torvalds __u8 spare; 1691da177e4SLinus Torvalds } __attribute__ ((packed)); 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds struct tower_get_version_reply { 1721da177e4SLinus Torvalds __le16 size; /* little-endian */ 1731da177e4SLinus Torvalds __u8 err_code; 1741da177e4SLinus Torvalds __u8 spare; 1751da177e4SLinus Torvalds __u8 major; 1761da177e4SLinus Torvalds __u8 minor; 1771da177e4SLinus Torvalds __le16 build_no; /* little-endian */ 1781da177e4SLinus Torvalds } __attribute__ ((packed)); 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* table of devices that work with this driver */ 18233b9e162SNémeth Márton static const struct usb_device_id tower_table[] = { 1831da177e4SLinus Torvalds { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, 1841da177e4SLinus Torvalds { } /* Terminating entry */ 1851da177e4SLinus Torvalds }; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, tower_table); 18878663eccSOliver Neukum static DEFINE_MUTEX(open_disc_mutex); 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds #define LEGO_USB_TOWER_MINOR_BASE 160 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds /* Structure to hold all of our device specific stuff */ 1941da177e4SLinus Torvalds struct lego_usb_tower { 19518bcbcfeSDaniel Walker struct mutex lock; /* locks this structure */ 1961da177e4SLinus Torvalds struct usb_device* udev; /* save off the usb device pointer */ 1971da177e4SLinus Torvalds unsigned char minor; /* the starting minor number for this device */ 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds int open_count; /* number of times this port has been opened */ 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds char* read_buffer; 2021da177e4SLinus Torvalds size_t read_buffer_length; /* this much came in */ 2031da177e4SLinus Torvalds size_t read_packet_length; /* this much will be returned on read */ 2041da177e4SLinus Torvalds spinlock_t read_buffer_lock; 2051da177e4SLinus Torvalds int packet_timeout_jiffies; 2061da177e4SLinus Torvalds unsigned long read_last_arrival; 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds wait_queue_head_t read_wait; 2091da177e4SLinus Torvalds wait_queue_head_t write_wait; 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds char* interrupt_in_buffer; 2121da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_in_endpoint; 2131da177e4SLinus Torvalds struct urb* interrupt_in_urb; 2141da177e4SLinus Torvalds int interrupt_in_interval; 2151da177e4SLinus Torvalds int interrupt_in_running; 2161da177e4SLinus Torvalds int interrupt_in_done; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds char* interrupt_out_buffer; 2191da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_out_endpoint; 2201da177e4SLinus Torvalds struct urb* interrupt_out_urb; 2211da177e4SLinus Torvalds int interrupt_out_interval; 2221da177e4SLinus Torvalds int interrupt_out_busy; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds }; 2251da177e4SLinus Torvalds 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds /* local function prototypes */ 2281da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos); 2291da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos); 2301da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev); 2311da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file); 2321da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file); 2331da177e4SLinus Torvalds static unsigned int tower_poll (struct file *file, poll_table *wait); 2341da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence); 2351da177e4SLinus Torvalds 2361da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev); 2371da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev); 2387d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb); 2397d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb); 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); 2421da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* file operations needed when we register this driver */ 246066202ddSLuiz Fernando N. Capitulino static const struct file_operations tower_fops = { 2471da177e4SLinus Torvalds .owner = THIS_MODULE, 2481da177e4SLinus Torvalds .read = tower_read, 2491da177e4SLinus Torvalds .write = tower_write, 2501da177e4SLinus Torvalds .open = tower_open, 2511da177e4SLinus Torvalds .release = tower_release, 2521da177e4SLinus Torvalds .poll = tower_poll, 2531da177e4SLinus Torvalds .llseek = tower_llseek, 2541da177e4SLinus Torvalds }; 2551da177e4SLinus Torvalds 2562c9ede55SAl Viro static char *legousbtower_devnode(struct device *dev, umode_t *mode) 257f7a386c5SKay Sievers { 258f7a386c5SKay Sievers return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 259f7a386c5SKay Sievers } 260f7a386c5SKay Sievers 2611da177e4SLinus Torvalds /* 2621da177e4SLinus Torvalds * usb class driver info in order to get a minor number from the usb core, 263d6e5bcf4SGreg Kroah-Hartman * and to have the device registered with the driver core 2641da177e4SLinus Torvalds */ 2651da177e4SLinus Torvalds static struct usb_class_driver tower_class = { 266d6e5bcf4SGreg Kroah-Hartman .name = "legousbtower%d", 267e454cea2SKay Sievers .devnode = legousbtower_devnode, 2681da177e4SLinus Torvalds .fops = &tower_fops, 2691da177e4SLinus Torvalds .minor_base = LEGO_USB_TOWER_MINOR_BASE, 2701da177e4SLinus Torvalds }; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds /* usb specific object needed to register this driver with the usb subsystem */ 2741da177e4SLinus Torvalds static struct usb_driver tower_driver = { 2751da177e4SLinus Torvalds .name = "legousbtower", 2761da177e4SLinus Torvalds .probe = tower_probe, 2771da177e4SLinus Torvalds .disconnect = tower_disconnect, 2781da177e4SLinus Torvalds .id_table = tower_table, 2791da177e4SLinus Torvalds }; 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds /** 2831da177e4SLinus Torvalds * lego_usb_tower_debug_data 2841da177e4SLinus Torvalds */ 2854dae9963SGreg Kroah-Hartman static inline void lego_usb_tower_debug_data(struct device *dev, 2864dae9963SGreg Kroah-Hartman const char *function, int size, 2874dae9963SGreg Kroah-Hartman const unsigned char *data) 2881da177e4SLinus Torvalds { 2894dae9963SGreg Kroah-Hartman dev_dbg(dev, "%s - length = %d, data = %*ph\n", 2904dae9963SGreg Kroah-Hartman function, size, size, data); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /** 2951da177e4SLinus Torvalds * tower_delete 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev) 2981da177e4SLinus Torvalds { 2991da177e4SLinus Torvalds tower_abort_transfers (dev); 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds /* free data structures */ 3021da177e4SLinus Torvalds usb_free_urb(dev->interrupt_in_urb); 3031da177e4SLinus Torvalds usb_free_urb(dev->interrupt_out_urb); 3041da177e4SLinus Torvalds kfree (dev->read_buffer); 3051da177e4SLinus Torvalds kfree (dev->interrupt_in_buffer); 3061da177e4SLinus Torvalds kfree (dev->interrupt_out_buffer); 3071da177e4SLinus Torvalds kfree (dev); 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds /** 3121da177e4SLinus Torvalds * tower_open 3131da177e4SLinus Torvalds */ 3141da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file) 3151da177e4SLinus Torvalds { 3161da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 3171da177e4SLinus Torvalds int subminor; 3181da177e4SLinus Torvalds int retval = 0; 3191da177e4SLinus Torvalds struct usb_interface *interface; 3201da177e4SLinus Torvalds struct tower_reset_reply reset_reply; 3211da177e4SLinus Torvalds int result; 3221da177e4SLinus Torvalds 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 33478663eccSOliver Neukum mutex_lock(&open_disc_mutex); 3351da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if (!dev) { 33878663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3391da177e4SLinus Torvalds retval = -ENODEV; 340d4ead16fSAlan Stern goto exit; 3411da177e4SLinus Torvalds } 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* lock this device */ 34418bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 34578663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3461da177e4SLinus Torvalds retval = -ERESTARTSYS; 347d4ead16fSAlan Stern goto exit; 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 35078663eccSOliver Neukum 3511da177e4SLinus Torvalds /* allow opening only once */ 3521da177e4SLinus Torvalds if (dev->open_count) { 35378663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3541da177e4SLinus Torvalds retval = -EBUSY; 3551da177e4SLinus Torvalds goto unlock_exit; 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds dev->open_count = 1; 35878663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds /* reset the tower */ 3611da177e4SLinus Torvalds result = usb_control_msg (dev->udev, 3621da177e4SLinus Torvalds usb_rcvctrlpipe(dev->udev, 0), 3631da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_RESET, 3641da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 3651da177e4SLinus Torvalds 0, 3661da177e4SLinus Torvalds 0, 3671da177e4SLinus Torvalds &reset_reply, 3681da177e4SLinus Torvalds sizeof(reset_reply), 3691da177e4SLinus Torvalds 1000); 3701da177e4SLinus Torvalds if (result < 0) { 3719d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3729d974b2aSGreg Kroah-Hartman "LEGO USB Tower reset control request failed\n"); 3731da177e4SLinus Torvalds retval = result; 3741da177e4SLinus Torvalds goto unlock_exit; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds /* initialize in direction */ 3781da177e4SLinus Torvalds dev->read_buffer_length = 0; 3791da177e4SLinus Torvalds dev->read_packet_length = 0; 3801da177e4SLinus Torvalds usb_fill_int_urb (dev->interrupt_in_urb, 3811da177e4SLinus Torvalds dev->udev, 3821da177e4SLinus Torvalds usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), 3831da177e4SLinus Torvalds dev->interrupt_in_buffer, 38429cc8897SKuninori Morimoto usb_endpoint_maxp(dev->interrupt_in_endpoint), 3851da177e4SLinus Torvalds tower_interrupt_in_callback, 3861da177e4SLinus Torvalds dev, 3871da177e4SLinus Torvalds dev->interrupt_in_interval); 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds dev->interrupt_in_running = 1; 3901da177e4SLinus Torvalds dev->interrupt_in_done = 0; 3911da177e4SLinus Torvalds mb(); 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); 3941da177e4SLinus Torvalds if (retval) { 3959d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3969d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_in_urb %d\n", retval); 3971da177e4SLinus Torvalds dev->interrupt_in_running = 0; 3981da177e4SLinus Torvalds dev->open_count = 0; 3991da177e4SLinus Torvalds goto unlock_exit; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* save device in the file's private structure */ 4031da177e4SLinus Torvalds file->private_data = dev; 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds unlock_exit: 40618bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4071da177e4SLinus Torvalds 408d4ead16fSAlan Stern exit: 4091da177e4SLinus Torvalds return retval; 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds /** 4131da177e4SLinus Torvalds * tower_release 4141da177e4SLinus Torvalds */ 4151da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file) 4161da177e4SLinus Torvalds { 4171da177e4SLinus Torvalds struct lego_usb_tower *dev; 4181da177e4SLinus Torvalds int retval = 0; 4191da177e4SLinus Torvalds 4205bd6e8b3SJoe Perches dev = file->private_data; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds if (dev == NULL) { 4231da177e4SLinus Torvalds retval = -ENODEV; 42478663eccSOliver Neukum goto exit_nolock; 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds 42778663eccSOliver Neukum mutex_lock(&open_disc_mutex); 42818bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 4291da177e4SLinus Torvalds retval = -ERESTARTSYS; 4301da177e4SLinus Torvalds goto exit; 4311da177e4SLinus Torvalds } 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds if (dev->open_count != 1) { 434fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: device not opened exactly once\n", 435fef526caSGreg Kroah-Hartman __func__); 4361da177e4SLinus Torvalds retval = -ENODEV; 4371da177e4SLinus Torvalds goto unlock_exit; 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds if (dev->udev == NULL) { 4401da177e4SLinus Torvalds /* the device was unplugged before the file was released */ 44118bcbcfeSDaniel Walker 44218bcbcfeSDaniel Walker /* unlock here as tower_delete frees dev */ 44318bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4441da177e4SLinus Torvalds tower_delete (dev); 4451da177e4SLinus Torvalds goto exit; 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds /* wait until write transfer is finished */ 4491da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 4501da177e4SLinus Torvalds wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4511da177e4SLinus Torvalds } 4521da177e4SLinus Torvalds tower_abort_transfers (dev); 4531da177e4SLinus Torvalds dev->open_count = 0; 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds unlock_exit: 45618bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds exit: 45978663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 46078663eccSOliver Neukum exit_nolock: 4611da177e4SLinus Torvalds return retval; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds /** 4661da177e4SLinus Torvalds * tower_abort_transfers 4671da177e4SLinus Torvalds * aborts transfers and frees associated data structures 4681da177e4SLinus Torvalds */ 4691da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev) 4701da177e4SLinus Torvalds { 471fef526caSGreg Kroah-Hartman if (dev == NULL) 472d26f6e57SGreg Kroah-Hartman return; 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds /* shutdown transfer */ 4751da177e4SLinus Torvalds if (dev->interrupt_in_running) { 4761da177e4SLinus Torvalds dev->interrupt_in_running = 0; 4771da177e4SLinus Torvalds mb(); 478f53510e8SMariusz Kozlowski if (dev->udev) 4791da177e4SLinus Torvalds usb_kill_urb (dev->interrupt_in_urb); 4801da177e4SLinus Torvalds } 481f53510e8SMariusz Kozlowski if (dev->interrupt_out_busy && dev->udev) 4821da177e4SLinus Torvalds usb_kill_urb(dev->interrupt_out_urb); 4831da177e4SLinus Torvalds } 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds /** 4871da177e4SLinus Torvalds * tower_check_for_read_packet 4881da177e4SLinus Torvalds * 4891da177e4SLinus Torvalds * To get correct semantics for signals and non-blocking I/O 4901da177e4SLinus Torvalds * with packetizing we pretend not to see any data in the read buffer 4911da177e4SLinus Torvalds * until it has been there unchanged for at least 4921da177e4SLinus Torvalds * dev->packet_timeout_jiffies, or until the buffer is full. 4931da177e4SLinus Torvalds */ 4941da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev) 4951da177e4SLinus Torvalds { 4961da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 4971da177e4SLinus Torvalds if (!packet_timeout 4981da177e4SLinus Torvalds || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) 4991da177e4SLinus Torvalds || dev->read_buffer_length == read_buffer_size) { 5001da177e4SLinus Torvalds dev->read_packet_length = dev->read_buffer_length; 5011da177e4SLinus Torvalds } 5021da177e4SLinus Torvalds dev->interrupt_in_done = 0; 5031da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /** 5081da177e4SLinus Torvalds * tower_poll 5091da177e4SLinus Torvalds */ 5101da177e4SLinus Torvalds static unsigned int tower_poll (struct file *file, poll_table *wait) 5111da177e4SLinus Torvalds { 5121da177e4SLinus Torvalds struct lego_usb_tower *dev; 5131da177e4SLinus Torvalds unsigned int mask = 0; 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds dev = file->private_data; 5161da177e4SLinus Torvalds 517d35b4ce1SOliver Neukum if (!dev->udev) 518d35b4ce1SOliver Neukum return POLLERR | POLLHUP; 519d35b4ce1SOliver Neukum 5201da177e4SLinus Torvalds poll_wait(file, &dev->read_wait, wait); 5211da177e4SLinus Torvalds poll_wait(file, &dev->write_wait, wait); 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5241da177e4SLinus Torvalds if (dev->read_packet_length > 0) { 5251da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 5261da177e4SLinus Torvalds } 5271da177e4SLinus Torvalds if (!dev->interrupt_out_busy) { 5281da177e4SLinus Torvalds mask |= POLLOUT | POLLWRNORM; 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds return mask; 5321da177e4SLinus Torvalds } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds /** 5361da177e4SLinus Torvalds * tower_llseek 5371da177e4SLinus Torvalds */ 5381da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence) 5391da177e4SLinus Torvalds { 5401da177e4SLinus Torvalds return -ESPIPE; /* unseekable */ 5411da177e4SLinus Torvalds } 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds /** 5451da177e4SLinus Torvalds * tower_read 5461da177e4SLinus Torvalds */ 5471da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) 5481da177e4SLinus Torvalds { 5491da177e4SLinus Torvalds struct lego_usb_tower *dev; 5501da177e4SLinus Torvalds size_t bytes_to_read; 5511da177e4SLinus Torvalds int i; 5521da177e4SLinus Torvalds int retval = 0; 5531da177e4SLinus Torvalds unsigned long timeout = 0; 5541da177e4SLinus Torvalds 5555bd6e8b3SJoe Perches dev = file->private_data; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds /* lock this object */ 55818bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 5591da177e4SLinus Torvalds retval = -ERESTARTSYS; 5601da177e4SLinus Torvalds goto exit; 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 5641da177e4SLinus Torvalds if (dev->udev == NULL) { 5651da177e4SLinus Torvalds retval = -ENODEV; 56638726bf5SGreg Kroah-Hartman pr_err("No device or device unplugged %d\n", retval); 5671da177e4SLinus Torvalds goto unlock_exit; 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* verify that we actually have some data to read */ 5711da177e4SLinus Torvalds if (count == 0) { 572fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "read request of 0 bytes\n"); 5731da177e4SLinus Torvalds goto unlock_exit; 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds if (read_timeout) { 5778f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5781da177e4SLinus Torvalds } 5791da177e4SLinus Torvalds 5801da177e4SLinus Torvalds /* wait for data */ 5811da177e4SLinus Torvalds tower_check_for_read_packet (dev); 5821da177e4SLinus Torvalds while (dev->read_packet_length == 0) { 5831da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 5841da177e4SLinus Torvalds retval = -EAGAIN; 5851da177e4SLinus Torvalds goto unlock_exit; 5861da177e4SLinus Torvalds } 5871da177e4SLinus Torvalds retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); 5881da177e4SLinus Torvalds if (retval < 0) { 5891da177e4SLinus Torvalds goto unlock_exit; 5901da177e4SLinus Torvalds } 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds /* reset read timeout during read or write activity */ 5931da177e4SLinus Torvalds if (read_timeout 5941da177e4SLinus Torvalds && (dev->read_buffer_length || dev->interrupt_out_busy)) { 5958f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds /* check for read timeout */ 5981da177e4SLinus Torvalds if (read_timeout && time_after (jiffies, timeout)) { 5991da177e4SLinus Torvalds retval = -ETIMEDOUT; 6001da177e4SLinus Torvalds goto unlock_exit; 6011da177e4SLinus Torvalds } 6021da177e4SLinus Torvalds tower_check_for_read_packet (dev); 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds /* copy the data from read_buffer into userspace */ 6061da177e4SLinus Torvalds bytes_to_read = min(count, dev->read_packet_length); 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { 6091da177e4SLinus Torvalds retval = -EFAULT; 6101da177e4SLinus Torvalds goto unlock_exit; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 6141da177e4SLinus Torvalds dev->read_buffer_length -= bytes_to_read; 6151da177e4SLinus Torvalds dev->read_packet_length -= bytes_to_read; 6161da177e4SLinus Torvalds for (i=0; i<dev->read_buffer_length; i++) { 6171da177e4SLinus Torvalds dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; 6181da177e4SLinus Torvalds } 6191da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds retval = bytes_to_read; 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds unlock_exit: 6241da177e4SLinus Torvalds /* unlock the device */ 62518bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds exit: 6281da177e4SLinus Torvalds return retval; 6291da177e4SLinus Torvalds } 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /** 6331da177e4SLinus Torvalds * tower_write 6341da177e4SLinus Torvalds */ 6351da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 6361da177e4SLinus Torvalds { 6371da177e4SLinus Torvalds struct lego_usb_tower *dev; 6381da177e4SLinus Torvalds size_t bytes_to_write; 6391da177e4SLinus Torvalds int retval = 0; 6401da177e4SLinus Torvalds 6415bd6e8b3SJoe Perches dev = file->private_data; 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /* lock this object */ 64418bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 6451da177e4SLinus Torvalds retval = -ERESTARTSYS; 6461da177e4SLinus Torvalds goto exit; 6471da177e4SLinus Torvalds } 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6501da177e4SLinus Torvalds if (dev->udev == NULL) { 6511da177e4SLinus Torvalds retval = -ENODEV; 65238726bf5SGreg Kroah-Hartman pr_err("No device or device unplugged %d\n", retval); 6531da177e4SLinus Torvalds goto unlock_exit; 6541da177e4SLinus Torvalds } 6551da177e4SLinus Torvalds 6561da177e4SLinus Torvalds /* verify that we actually have some data to write */ 6571da177e4SLinus Torvalds if (count == 0) { 658fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "write request of 0 bytes\n"); 6591da177e4SLinus Torvalds goto unlock_exit; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds /* wait until previous transfer is finished */ 6631da177e4SLinus Torvalds while (dev->interrupt_out_busy) { 6641da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 6651da177e4SLinus Torvalds retval = -EAGAIN; 6661da177e4SLinus Torvalds goto unlock_exit; 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); 6691da177e4SLinus Torvalds if (retval) { 6701da177e4SLinus Torvalds goto unlock_exit; 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds /* write the data into interrupt_out_buffer from userspace */ 6751da177e4SLinus Torvalds bytes_to_write = min_t(int, count, write_buffer_size); 6765b5e0928SAlexey Dobriyan dev_dbg(&dev->udev->dev, "%s: count = %zd, bytes_to_write = %zd\n", 677fef526caSGreg Kroah-Hartman __func__, count, bytes_to_write); 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { 6801da177e4SLinus Torvalds retval = -EFAULT; 6811da177e4SLinus Torvalds goto unlock_exit; 6821da177e4SLinus Torvalds } 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds /* send off the urb */ 6851da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_out_urb, 6861da177e4SLinus Torvalds dev->udev, 6871da177e4SLinus Torvalds usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 6881da177e4SLinus Torvalds dev->interrupt_out_buffer, 6891da177e4SLinus Torvalds bytes_to_write, 6901da177e4SLinus Torvalds tower_interrupt_out_callback, 6911da177e4SLinus Torvalds dev, 6921da177e4SLinus Torvalds dev->interrupt_out_interval); 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds dev->interrupt_out_busy = 1; 6951da177e4SLinus Torvalds wmb(); 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); 6981da177e4SLinus Torvalds if (retval) { 6991da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7009d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 7019d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_out_urb %d\n", retval); 7021da177e4SLinus Torvalds goto unlock_exit; 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds retval = bytes_to_write; 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds unlock_exit: 7071da177e4SLinus Torvalds /* unlock the device */ 70818bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds exit: 7111da177e4SLinus Torvalds return retval; 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds /** 7161da177e4SLinus Torvalds * tower_interrupt_in_callback 7171da177e4SLinus Torvalds */ 7187d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb) 7191da177e4SLinus Torvalds { 720cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 72164771a0fSGreg Kroah-Hartman int status = urb->status; 7221da177e4SLinus Torvalds int retval; 7231da177e4SLinus Torvalds 7244dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7254dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7261da177e4SLinus Torvalds 72764771a0fSGreg Kroah-Hartman if (status) { 72864771a0fSGreg Kroah-Hartman if (status == -ENOENT || 72964771a0fSGreg Kroah-Hartman status == -ECONNRESET || 73064771a0fSGreg Kroah-Hartman status == -ESHUTDOWN) { 7311da177e4SLinus Torvalds goto exit; 7321da177e4SLinus Torvalds } else { 733fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 734fef526caSGreg Kroah-Hartman "%s: nonzero status received: %d\n", __func__, 735fef526caSGreg Kroah-Hartman status); 7361da177e4SLinus Torvalds goto resubmit; /* maybe we can recover */ 7371da177e4SLinus Torvalds } 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds if (urb->actual_length > 0) { 7411da177e4SLinus Torvalds spin_lock (&dev->read_buffer_lock); 7421da177e4SLinus Torvalds if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { 7431da177e4SLinus Torvalds memcpy (dev->read_buffer + dev->read_buffer_length, 7441da177e4SLinus Torvalds dev->interrupt_in_buffer, 7451da177e4SLinus Torvalds urb->actual_length); 7461da177e4SLinus Torvalds dev->read_buffer_length += urb->actual_length; 7471da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 748fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: received %d bytes\n", 749fef526caSGreg Kroah-Hartman __func__, urb->actual_length); 7501da177e4SLinus Torvalds } else { 75138726bf5SGreg Kroah-Hartman pr_warn("read_buffer overflow, %d bytes dropped\n", 75238726bf5SGreg Kroah-Hartman urb->actual_length); 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds spin_unlock (&dev->read_buffer_lock); 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds resubmit: 7581da177e4SLinus Torvalds /* resubmit if we're still running */ 7591da177e4SLinus Torvalds if (dev->interrupt_in_running && dev->udev) { 7601da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); 7619d974b2aSGreg Kroah-Hartman if (retval) 7629d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 7639d974b2aSGreg Kroah-Hartman "%s: usb_submit_urb failed (%d)\n", 7649d974b2aSGreg Kroah-Hartman __func__, retval); 7651da177e4SLinus Torvalds } 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds exit: 7681da177e4SLinus Torvalds dev->interrupt_in_done = 1; 7691da177e4SLinus Torvalds wake_up_interruptible (&dev->read_wait); 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds /** 7741da177e4SLinus Torvalds * tower_interrupt_out_callback 7751da177e4SLinus Torvalds */ 7767d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb) 7771da177e4SLinus Torvalds { 778cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 77964771a0fSGreg Kroah-Hartman int status = urb->status; 7801da177e4SLinus Torvalds 7814dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7824dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds /* sync/async unlink faults aren't errors */ 78564771a0fSGreg Kroah-Hartman if (status && !(status == -ENOENT || 78664771a0fSGreg Kroah-Hartman status == -ECONNRESET || 78764771a0fSGreg Kroah-Hartman status == -ESHUTDOWN)) { 788fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 789fef526caSGreg Kroah-Hartman "%s: nonzero write bulk status received: %d\n", __func__, 790fef526caSGreg Kroah-Hartman status); 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7941da177e4SLinus Torvalds wake_up_interruptible(&dev->write_wait); 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds /** 7991da177e4SLinus Torvalds * tower_probe 8001da177e4SLinus Torvalds * 8011da177e4SLinus Torvalds * Called by the usb core when a new device is connected that it thinks 8021da177e4SLinus Torvalds * this driver might be interested in. 8031da177e4SLinus Torvalds */ 8041da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id) 8051da177e4SLinus Torvalds { 8069d974b2aSGreg Kroah-Hartman struct device *idev = &interface->dev; 8071da177e4SLinus Torvalds struct usb_device *udev = interface_to_usbdev(interface); 8081da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 8091da177e4SLinus Torvalds struct tower_get_version_reply get_version_reply; 8101da177e4SLinus Torvalds int retval = -ENOMEM; 8111da177e4SLinus Torvalds int result; 8121da177e4SLinus Torvalds 813093cf723SSteven Cole /* allocate memory for our device state and initialize it */ 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); 8161da177e4SLinus Torvalds 81749d8ffabSWolfram Sang if (!dev) 8181da177e4SLinus Torvalds goto exit; 8191da177e4SLinus Torvalds 82018bcbcfeSDaniel Walker mutex_init(&dev->lock); 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds dev->udev = udev; 8231da177e4SLinus Torvalds dev->open_count = 0; 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds dev->read_buffer = NULL; 8261da177e4SLinus Torvalds dev->read_buffer_length = 0; 8271da177e4SLinus Torvalds dev->read_packet_length = 0; 8281da177e4SLinus Torvalds spin_lock_init (&dev->read_buffer_lock); 8298f7e9473SNicholas Mc Guire dev->packet_timeout_jiffies = msecs_to_jiffies(packet_timeout); 8301da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds init_waitqueue_head (&dev->read_wait); 8331da177e4SLinus Torvalds init_waitqueue_head (&dev->write_wait); 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds dev->interrupt_in_buffer = NULL; 8361da177e4SLinus Torvalds dev->interrupt_in_endpoint = NULL; 8371da177e4SLinus Torvalds dev->interrupt_in_urb = NULL; 8381da177e4SLinus Torvalds dev->interrupt_in_running = 0; 8391da177e4SLinus Torvalds dev->interrupt_in_done = 0; 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds dev->interrupt_out_buffer = NULL; 8421da177e4SLinus Torvalds dev->interrupt_out_endpoint = NULL; 8431da177e4SLinus Torvalds dev->interrupt_out_urb = NULL; 8441da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 8451da177e4SLinus Torvalds 8469b181166SJohan Hovold result = usb_find_common_endpoints_reverse(interface->cur_altsetting, 8479b181166SJohan Hovold NULL, NULL, 8489b181166SJohan Hovold &dev->interrupt_in_endpoint, 8499b181166SJohan Hovold &dev->interrupt_out_endpoint); 8509b181166SJohan Hovold if (result) { 8519b181166SJohan Hovold dev_err(idev, "interrupt endpoints not found\n"); 8529b181166SJohan Hovold retval = result; 8531da177e4SLinus Torvalds goto error; 8541da177e4SLinus Torvalds } 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); 85749d8ffabSWolfram Sang if (!dev->read_buffer) 8581da177e4SLinus Torvalds goto error; 85929cc8897SKuninori Morimoto dev->interrupt_in_buffer = kmalloc (usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL); 86049d8ffabSWolfram Sang if (!dev->interrupt_in_buffer) 8611da177e4SLinus Torvalds goto error; 8621da177e4SLinus Torvalds dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 863a131f41fSWolfram Sang if (!dev->interrupt_in_urb) 8641da177e4SLinus Torvalds goto error; 8651da177e4SLinus Torvalds dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); 86649d8ffabSWolfram Sang if (!dev->interrupt_out_buffer) 8671da177e4SLinus Torvalds goto error; 8681da177e4SLinus Torvalds dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 869a131f41fSWolfram Sang if (!dev->interrupt_out_urb) 8701da177e4SLinus Torvalds goto error; 8711da177e4SLinus Torvalds dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 8721da177e4SLinus Torvalds dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds /* get the firmware version and log it */ 8751da177e4SLinus Torvalds result = usb_control_msg (udev, 8761da177e4SLinus Torvalds usb_rcvctrlpipe(udev, 0), 8771da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_GET_VERSION, 8781da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 8791da177e4SLinus Torvalds 0, 8801da177e4SLinus Torvalds 0, 8811da177e4SLinus Torvalds &get_version_reply, 8821da177e4SLinus Torvalds sizeof(get_version_reply), 8831da177e4SLinus Torvalds 1000); 8841da177e4SLinus Torvalds if (result < 0) { 8859d974b2aSGreg Kroah-Hartman dev_err(idev, "LEGO USB Tower get version control request failed\n"); 8861da177e4SLinus Torvalds retval = result; 8871da177e4SLinus Torvalds goto error; 8881da177e4SLinus Torvalds } 8891b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower firmware version is %d.%d " 8901b29a375SGreg Kroah-Hartman "build %d\n", get_version_reply.major, 8911da177e4SLinus Torvalds get_version_reply.minor, 8921da177e4SLinus Torvalds le16_to_cpu(get_version_reply.build_no)); 8931da177e4SLinus Torvalds 8942fae9e5aSGreg Kroah-Hartman /* we can register the device now, as it is ready */ 8952fae9e5aSGreg Kroah-Hartman usb_set_intfdata (interface, dev); 8962fae9e5aSGreg Kroah-Hartman 8972fae9e5aSGreg Kroah-Hartman retval = usb_register_dev (interface, &tower_class); 8982fae9e5aSGreg Kroah-Hartman 8992fae9e5aSGreg Kroah-Hartman if (retval) { 9002fae9e5aSGreg Kroah-Hartman /* something prevented us from registering this driver */ 9012fae9e5aSGreg Kroah-Hartman dev_err(idev, "Not able to get a minor for this device.\n"); 9022fae9e5aSGreg Kroah-Hartman usb_set_intfdata (interface, NULL); 9032fae9e5aSGreg Kroah-Hartman goto error; 9042fae9e5aSGreg Kroah-Hartman } 9052fae9e5aSGreg Kroah-Hartman dev->minor = interface->minor; 9062fae9e5aSGreg Kroah-Hartman 9072fae9e5aSGreg Kroah-Hartman /* let the user know what node this device is now attached to */ 9082fae9e5aSGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " 9092fae9e5aSGreg Kroah-Hartman "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), 9102fae9e5aSGreg Kroah-Hartman USB_MAJOR, dev->minor); 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds exit: 9131da177e4SLinus Torvalds return retval; 9141da177e4SLinus Torvalds 9151da177e4SLinus Torvalds error: 9161da177e4SLinus Torvalds tower_delete(dev); 9171da177e4SLinus Torvalds return retval; 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds /** 9221da177e4SLinus Torvalds * tower_disconnect 9231da177e4SLinus Torvalds * 9241da177e4SLinus Torvalds * Called by the usb core when the device is removed from the system. 9251da177e4SLinus Torvalds */ 9261da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface) 9271da177e4SLinus Torvalds { 9281da177e4SLinus Torvalds struct lego_usb_tower *dev; 9291da177e4SLinus Torvalds int minor; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds dev = usb_get_intfdata (interface); 93278663eccSOliver Neukum mutex_lock(&open_disc_mutex); 9331da177e4SLinus Torvalds usb_set_intfdata (interface, NULL); 9341da177e4SLinus Torvalds 9351da177e4SLinus Torvalds minor = dev->minor; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds /* give back our minor */ 9381da177e4SLinus Torvalds usb_deregister_dev (interface, &tower_class); 9391da177e4SLinus Torvalds 94018bcbcfeSDaniel Walker mutex_lock(&dev->lock); 94178663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 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