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 341da177e4SLinus Torvalds * - changed dbg() to use __func__ rather than deprecated __FUNCTION__ 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 521da177e4SLinus Torvalds * - changed back __func__ to __FUNCTION__ 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 781da177e4SLinus Torvalds #include <linux/kernel.h> 791da177e4SLinus Torvalds #include <linux/errno.h> 801da177e4SLinus Torvalds #include <linux/init.h> 811da177e4SLinus Torvalds #include <linux/slab.h> 821da177e4SLinus Torvalds #include <linux/module.h> 831da177e4SLinus Torvalds #include <linux/smp_lock.h> 841da177e4SLinus Torvalds #include <linux/completion.h> 854186ecf8SArjan van de Ven #include <linux/mutex.h> 861da177e4SLinus Torvalds #include <asm/uaccess.h> 871da177e4SLinus Torvalds #include <linux/usb.h> 881da177e4SLinus Torvalds #include <linux/poll.h> 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds #ifdef CONFIG_USB_DEBUG 921da177e4SLinus Torvalds static int debug = 4; 931da177e4SLinus Torvalds #else 941da177e4SLinus Torvalds static int debug = 0; 951da177e4SLinus Torvalds #endif 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* Use our own dbg macro */ 981da177e4SLinus Torvalds #undef dbg 991da177e4SLinus Torvalds #define dbg(lvl, format, arg...) do { if (debug >= lvl) printk(KERN_DEBUG __FILE__ ": " format "\n", ## arg); } while (0) 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* Version Information */ 1031da177e4SLinus Torvalds #define DRIVER_VERSION "v0.96" 1041da177e4SLinus Torvalds #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" 1051da177e4SLinus Torvalds #define DRIVER_DESC "LEGO USB Tower Driver" 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* Module parameters */ 1081da177e4SLinus Torvalds module_param(debug, int, S_IRUGO | S_IWUSR); 1091da177e4SLinus Torvalds MODULE_PARM_DESC(debug, "Debug enabled or not"); 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* The defaults are chosen to work with the latest versions of leJOS and NQC. 1121da177e4SLinus Torvalds */ 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* Some legacy software likes to receive packets in one piece. 1151da177e4SLinus Torvalds * In this case read_buffer_size should exceed the maximal packet length 1161da177e4SLinus Torvalds * (417 for datalog uploads), and packet_timeout should be set. 1171da177e4SLinus Torvalds */ 1181da177e4SLinus Torvalds static int read_buffer_size = 480; 1191da177e4SLinus Torvalds module_param(read_buffer_size, int, 0); 1201da177e4SLinus Torvalds MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* Some legacy software likes to send packets in one piece. 1231da177e4SLinus Torvalds * In this case write_buffer_size should exceed the maximal packet length 1241da177e4SLinus Torvalds * (417 for firmware and program downloads). 1251da177e4SLinus Torvalds * A problem with long writes is that the following read may time out 1261da177e4SLinus Torvalds * if the software is not prepared to wait long enough. 1271da177e4SLinus Torvalds */ 1281da177e4SLinus Torvalds static int write_buffer_size = 480; 1291da177e4SLinus Torvalds module_param(write_buffer_size, int, 0); 1301da177e4SLinus Torvalds MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds /* Some legacy software expects reads to contain whole LASM packets. 1331da177e4SLinus Torvalds * To achieve this, characters which arrive before a packet timeout 1341da177e4SLinus Torvalds * occurs will be returned in a single read operation. 1351da177e4SLinus Torvalds * A problem with long reads is that the software may time out 1361da177e4SLinus Torvalds * if it is not prepared to wait long enough. 1371da177e4SLinus Torvalds * The packet timeout should be greater than the time between the 1381da177e4SLinus Torvalds * reception of subsequent characters, which should arrive about 1391da177e4SLinus Torvalds * every 5ms for the standard 2400 baud. 1401da177e4SLinus Torvalds * Set it to 0 to disable. 1411da177e4SLinus Torvalds */ 1421da177e4SLinus Torvalds static int packet_timeout = 50; 1431da177e4SLinus Torvalds module_param(packet_timeout, int, 0); 1441da177e4SLinus Torvalds MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* Some legacy software expects blocking reads to time out. 1471da177e4SLinus Torvalds * Timeout occurs after the specified time of read and write inactivity. 1481da177e4SLinus Torvalds * Set it to 0 to disable. 1491da177e4SLinus Torvalds */ 1501da177e4SLinus Torvalds static int read_timeout = 200; 1511da177e4SLinus Torvalds module_param(read_timeout, int, 0); 1521da177e4SLinus Torvalds MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds /* As of kernel version 2.6.4 ehci-hcd uses an 1551da177e4SLinus Torvalds * "only one interrupt transfer per frame" shortcut 1561da177e4SLinus Torvalds * to simplify the scheduling of periodic transfers. 1571da177e4SLinus Torvalds * This conflicts with our standard 1ms intervals for in and out URBs. 1581da177e4SLinus Torvalds * We use default intervals of 2ms for in and 8ms for out transfers, 1591da177e4SLinus Torvalds * which is fast enough for 2400 baud and allows a small additional load. 1601da177e4SLinus Torvalds * Increase the interval to allow more devices that do interrupt transfers, 1611da177e4SLinus Torvalds * or set to 0 to use the standard interval from the endpoint descriptors. 1621da177e4SLinus Torvalds */ 1631da177e4SLinus Torvalds static int interrupt_in_interval = 2; 1641da177e4SLinus Torvalds module_param(interrupt_in_interval, int, 0); 1651da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds static int interrupt_out_interval = 8; 1681da177e4SLinus Torvalds module_param(interrupt_out_interval, int, 0); 1691da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds /* Define these values to match your device */ 1721da177e4SLinus Torvalds #define LEGO_USB_TOWER_VENDOR_ID 0x0694 1731da177e4SLinus Torvalds #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* Vendor requests */ 1761da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_RESET 0x04 1771da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds struct tower_reset_reply { 1801da177e4SLinus Torvalds __le16 size; /* little-endian */ 1811da177e4SLinus Torvalds __u8 err_code; 1821da177e4SLinus Torvalds __u8 spare; 1831da177e4SLinus Torvalds } __attribute__ ((packed)); 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds struct tower_get_version_reply { 1861da177e4SLinus Torvalds __le16 size; /* little-endian */ 1871da177e4SLinus Torvalds __u8 err_code; 1881da177e4SLinus Torvalds __u8 spare; 1891da177e4SLinus Torvalds __u8 major; 1901da177e4SLinus Torvalds __u8 minor; 1911da177e4SLinus Torvalds __le16 build_no; /* little-endian */ 1921da177e4SLinus Torvalds } __attribute__ ((packed)); 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds /* table of devices that work with this driver */ 1961da177e4SLinus Torvalds static struct usb_device_id tower_table [] = { 1971da177e4SLinus Torvalds { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, 1981da177e4SLinus Torvalds { } /* Terminating entry */ 1991da177e4SLinus Torvalds }; 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, tower_table); 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds #define LEGO_USB_TOWER_MINOR_BASE 160 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds 2061da177e4SLinus Torvalds /* Structure to hold all of our device specific stuff */ 2071da177e4SLinus Torvalds struct lego_usb_tower { 2081da177e4SLinus Torvalds struct semaphore sem; /* locks this structure */ 2091da177e4SLinus Torvalds struct usb_device* udev; /* save off the usb device pointer */ 2101da177e4SLinus Torvalds unsigned char minor; /* the starting minor number for this device */ 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds int open_count; /* number of times this port has been opened */ 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds char* read_buffer; 2151da177e4SLinus Torvalds size_t read_buffer_length; /* this much came in */ 2161da177e4SLinus Torvalds size_t read_packet_length; /* this much will be returned on read */ 2171da177e4SLinus Torvalds spinlock_t read_buffer_lock; 2181da177e4SLinus Torvalds int packet_timeout_jiffies; 2191da177e4SLinus Torvalds unsigned long read_last_arrival; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds wait_queue_head_t read_wait; 2221da177e4SLinus Torvalds wait_queue_head_t write_wait; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds char* interrupt_in_buffer; 2251da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_in_endpoint; 2261da177e4SLinus Torvalds struct urb* interrupt_in_urb; 2271da177e4SLinus Torvalds int interrupt_in_interval; 2281da177e4SLinus Torvalds int interrupt_in_running; 2291da177e4SLinus Torvalds int interrupt_in_done; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds char* interrupt_out_buffer; 2321da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_out_endpoint; 2331da177e4SLinus Torvalds struct urb* interrupt_out_urb; 2341da177e4SLinus Torvalds int interrupt_out_interval; 2351da177e4SLinus Torvalds int interrupt_out_busy; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds }; 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds 2401da177e4SLinus Torvalds /* local function prototypes */ 2411da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos); 2421da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos); 2431da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev); 2441da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file); 2451da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file); 2461da177e4SLinus Torvalds static unsigned int tower_poll (struct file *file, poll_table *wait); 2471da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence); 2481da177e4SLinus Torvalds 2491da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev); 2501da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev); 2511da177e4SLinus Torvalds static void tower_interrupt_in_callback (struct urb *urb, struct pt_regs *regs); 2521da177e4SLinus Torvalds static void tower_interrupt_out_callback (struct urb *urb, struct pt_regs *regs); 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); 2551da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface); 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds /* prevent races between open() and disconnect */ 2594186ecf8SArjan van de Ven static DEFINE_MUTEX (disconnect_mutex); 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds /* file operations needed when we register this driver */ 262066202ddSLuiz Fernando N. Capitulino static const struct file_operations tower_fops = { 2631da177e4SLinus Torvalds .owner = THIS_MODULE, 2641da177e4SLinus Torvalds .read = tower_read, 2651da177e4SLinus Torvalds .write = tower_write, 2661da177e4SLinus Torvalds .open = tower_open, 2671da177e4SLinus Torvalds .release = tower_release, 2681da177e4SLinus Torvalds .poll = tower_poll, 2691da177e4SLinus Torvalds .llseek = tower_llseek, 2701da177e4SLinus Torvalds }; 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds /* 2731da177e4SLinus Torvalds * usb class driver info in order to get a minor number from the usb core, 274d6e5bcf4SGreg Kroah-Hartman * and to have the device registered with the driver core 2751da177e4SLinus Torvalds */ 2761da177e4SLinus Torvalds static struct usb_class_driver tower_class = { 277d6e5bcf4SGreg Kroah-Hartman .name = "legousbtower%d", 2781da177e4SLinus Torvalds .fops = &tower_fops, 2791da177e4SLinus Torvalds .minor_base = LEGO_USB_TOWER_MINOR_BASE, 2801da177e4SLinus Torvalds }; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds /* usb specific object needed to register this driver with the usb subsystem */ 2841da177e4SLinus Torvalds static struct usb_driver tower_driver = { 2851da177e4SLinus Torvalds .name = "legousbtower", 2861da177e4SLinus Torvalds .probe = tower_probe, 2871da177e4SLinus Torvalds .disconnect = tower_disconnect, 2881da177e4SLinus Torvalds .id_table = tower_table, 2891da177e4SLinus Torvalds }; 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /** 2931da177e4SLinus Torvalds * lego_usb_tower_debug_data 2941da177e4SLinus Torvalds */ 2951da177e4SLinus Torvalds static inline void lego_usb_tower_debug_data (int level, const char *function, int size, const unsigned char *data) 2961da177e4SLinus Torvalds { 2971da177e4SLinus Torvalds int i; 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds if (debug < level) 3001da177e4SLinus Torvalds return; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", function, size); 3031da177e4SLinus Torvalds for (i = 0; i < size; ++i) { 3041da177e4SLinus Torvalds printk ("%.2x ", data[i]); 3051da177e4SLinus Torvalds } 3061da177e4SLinus Torvalds printk ("\n"); 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds /** 3111da177e4SLinus Torvalds * tower_delete 3121da177e4SLinus Torvalds */ 3131da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev) 3141da177e4SLinus Torvalds { 3151da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds tower_abort_transfers (dev); 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds /* free data structures */ 3201da177e4SLinus Torvalds if (dev->interrupt_in_urb != NULL) { 3211da177e4SLinus Torvalds usb_free_urb (dev->interrupt_in_urb); 3221da177e4SLinus Torvalds } 3231da177e4SLinus Torvalds if (dev->interrupt_out_urb != NULL) { 3241da177e4SLinus Torvalds usb_free_urb (dev->interrupt_out_urb); 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds kfree (dev->read_buffer); 3271da177e4SLinus Torvalds kfree (dev->interrupt_in_buffer); 3281da177e4SLinus Torvalds kfree (dev->interrupt_out_buffer); 3291da177e4SLinus Torvalds kfree (dev); 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds dbg(2, "%s: leave", __FUNCTION__); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds /** 3361da177e4SLinus Torvalds * tower_open 3371da177e4SLinus Torvalds */ 3381da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file) 3391da177e4SLinus Torvalds { 3401da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 3411da177e4SLinus Torvalds int subminor; 3421da177e4SLinus Torvalds int retval = 0; 3431da177e4SLinus Torvalds struct usb_interface *interface; 3441da177e4SLinus Torvalds struct tower_reset_reply reset_reply; 3451da177e4SLinus Torvalds int result; 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds nonseekable_open(inode, file); 3501da177e4SLinus Torvalds subminor = iminor(inode); 3511da177e4SLinus Torvalds 3524186ecf8SArjan van de Ven mutex_lock (&disconnect_mutex); 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds interface = usb_find_interface (&tower_driver, subminor); 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds if (!interface) { 3571da177e4SLinus Torvalds err ("%s - error, can't find device for minor %d", 3581da177e4SLinus Torvalds __FUNCTION__, subminor); 3591da177e4SLinus Torvalds retval = -ENODEV; 3601da177e4SLinus Torvalds goto unlock_disconnect_exit; 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvalds if (!dev) { 3661da177e4SLinus Torvalds retval = -ENODEV; 3671da177e4SLinus Torvalds goto unlock_disconnect_exit; 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds /* lock this device */ 3711da177e4SLinus Torvalds if (down_interruptible (&dev->sem)) { 3721da177e4SLinus Torvalds retval = -ERESTARTSYS; 3731da177e4SLinus Torvalds goto unlock_disconnect_exit; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds /* allow opening only once */ 3771da177e4SLinus Torvalds if (dev->open_count) { 3781da177e4SLinus Torvalds retval = -EBUSY; 3791da177e4SLinus Torvalds goto unlock_exit; 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds dev->open_count = 1; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* reset the tower */ 3841da177e4SLinus Torvalds result = usb_control_msg (dev->udev, 3851da177e4SLinus Torvalds usb_rcvctrlpipe(dev->udev, 0), 3861da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_RESET, 3871da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 3881da177e4SLinus Torvalds 0, 3891da177e4SLinus Torvalds 0, 3901da177e4SLinus Torvalds &reset_reply, 3911da177e4SLinus Torvalds sizeof(reset_reply), 3921da177e4SLinus Torvalds 1000); 3931da177e4SLinus Torvalds if (result < 0) { 3941da177e4SLinus Torvalds err("LEGO USB Tower reset control request failed"); 3951da177e4SLinus Torvalds retval = result; 3961da177e4SLinus Torvalds goto unlock_exit; 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* initialize in direction */ 4001da177e4SLinus Torvalds dev->read_buffer_length = 0; 4011da177e4SLinus Torvalds dev->read_packet_length = 0; 4021da177e4SLinus Torvalds usb_fill_int_urb (dev->interrupt_in_urb, 4031da177e4SLinus Torvalds dev->udev, 4041da177e4SLinus Torvalds usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), 4051da177e4SLinus Torvalds dev->interrupt_in_buffer, 4061da177e4SLinus Torvalds le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 4071da177e4SLinus Torvalds tower_interrupt_in_callback, 4081da177e4SLinus Torvalds dev, 4091da177e4SLinus Torvalds dev->interrupt_in_interval); 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds dev->interrupt_in_running = 1; 4121da177e4SLinus Torvalds dev->interrupt_in_done = 0; 4131da177e4SLinus Torvalds mb(); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); 4161da177e4SLinus Torvalds if (retval) { 4171da177e4SLinus Torvalds err("Couldn't submit interrupt_in_urb %d", retval); 4181da177e4SLinus Torvalds dev->interrupt_in_running = 0; 4191da177e4SLinus Torvalds dev->open_count = 0; 4201da177e4SLinus Torvalds goto unlock_exit; 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* save device in the file's private structure */ 4241da177e4SLinus Torvalds file->private_data = dev; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds unlock_exit: 4271da177e4SLinus Torvalds up (&dev->sem); 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds unlock_disconnect_exit: 4304186ecf8SArjan van de Ven mutex_unlock (&disconnect_mutex); 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds dbg(2, "%s: leave, return value %d ", __FUNCTION__, retval); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds return retval; 4351da177e4SLinus Torvalds } 4361da177e4SLinus Torvalds 4371da177e4SLinus Torvalds /** 4381da177e4SLinus Torvalds * tower_release 4391da177e4SLinus Torvalds */ 4401da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file) 4411da177e4SLinus Torvalds { 4421da177e4SLinus Torvalds struct lego_usb_tower *dev; 4431da177e4SLinus Torvalds int retval = 0; 4441da177e4SLinus Torvalds 4451da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 4461da177e4SLinus Torvalds 4471da177e4SLinus Torvalds dev = (struct lego_usb_tower *)file->private_data; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds if (dev == NULL) { 4501da177e4SLinus Torvalds dbg(1, "%s: object is NULL", __FUNCTION__); 4511da177e4SLinus Torvalds retval = -ENODEV; 4521da177e4SLinus Torvalds goto exit; 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds if (down_interruptible (&dev->sem)) { 4561da177e4SLinus Torvalds retval = -ERESTARTSYS; 4571da177e4SLinus Torvalds goto exit; 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds if (dev->open_count != 1) { 4611da177e4SLinus Torvalds dbg(1, "%s: device not opened exactly once", __FUNCTION__); 4621da177e4SLinus Torvalds retval = -ENODEV; 4631da177e4SLinus Torvalds goto unlock_exit; 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds if (dev->udev == NULL) { 4661da177e4SLinus Torvalds /* the device was unplugged before the file was released */ 4671da177e4SLinus Torvalds up (&dev->sem); /* unlock here as tower_delete frees dev */ 4681da177e4SLinus Torvalds tower_delete (dev); 4691da177e4SLinus Torvalds goto exit; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* wait until write transfer is finished */ 4731da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 4741da177e4SLinus Torvalds wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds tower_abort_transfers (dev); 4771da177e4SLinus Torvalds dev->open_count = 0; 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds unlock_exit: 4801da177e4SLinus Torvalds up (&dev->sem); 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds exit: 4831da177e4SLinus Torvalds dbg(2, "%s: leave, return value %d", __FUNCTION__, retval); 4841da177e4SLinus Torvalds return retval; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /** 4891da177e4SLinus Torvalds * tower_abort_transfers 4901da177e4SLinus Torvalds * aborts transfers and frees associated data structures 4911da177e4SLinus Torvalds */ 4921da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev) 4931da177e4SLinus Torvalds { 4941da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds if (dev == NULL) { 4971da177e4SLinus Torvalds dbg(1, "%s: dev is null", __FUNCTION__); 4981da177e4SLinus Torvalds goto exit; 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5011da177e4SLinus Torvalds /* shutdown transfer */ 5021da177e4SLinus Torvalds if (dev->interrupt_in_running) { 5031da177e4SLinus Torvalds dev->interrupt_in_running = 0; 5041da177e4SLinus Torvalds mb(); 5051da177e4SLinus Torvalds if (dev->interrupt_in_urb != NULL && dev->udev) { 5061da177e4SLinus Torvalds usb_kill_urb (dev->interrupt_in_urb); 5071da177e4SLinus Torvalds } 5081da177e4SLinus Torvalds } 5091da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 5101da177e4SLinus Torvalds if (dev->interrupt_out_urb != NULL && dev->udev) { 5111da177e4SLinus Torvalds usb_kill_urb (dev->interrupt_out_urb); 5121da177e4SLinus Torvalds } 5131da177e4SLinus Torvalds } 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds exit: 5161da177e4SLinus Torvalds dbg(2, "%s: leave", __FUNCTION__); 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /** 5211da177e4SLinus Torvalds * tower_check_for_read_packet 5221da177e4SLinus Torvalds * 5231da177e4SLinus Torvalds * To get correct semantics for signals and non-blocking I/O 5241da177e4SLinus Torvalds * with packetizing we pretend not to see any data in the read buffer 5251da177e4SLinus Torvalds * until it has been there unchanged for at least 5261da177e4SLinus Torvalds * dev->packet_timeout_jiffies, or until the buffer is full. 5271da177e4SLinus Torvalds */ 5281da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev) 5291da177e4SLinus Torvalds { 5301da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 5311da177e4SLinus Torvalds if (!packet_timeout 5321da177e4SLinus Torvalds || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) 5331da177e4SLinus Torvalds || dev->read_buffer_length == read_buffer_size) { 5341da177e4SLinus Torvalds dev->read_packet_length = dev->read_buffer_length; 5351da177e4SLinus Torvalds } 5361da177e4SLinus Torvalds dev->interrupt_in_done = 0; 5371da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds /** 5421da177e4SLinus Torvalds * tower_poll 5431da177e4SLinus Torvalds */ 5441da177e4SLinus Torvalds static unsigned int tower_poll (struct file *file, poll_table *wait) 5451da177e4SLinus Torvalds { 5461da177e4SLinus Torvalds struct lego_usb_tower *dev; 5471da177e4SLinus Torvalds unsigned int mask = 0; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds dev = file->private_data; 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds poll_wait(file, &dev->read_wait, wait); 5541da177e4SLinus Torvalds poll_wait(file, &dev->write_wait, wait); 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5571da177e4SLinus Torvalds if (dev->read_packet_length > 0) { 5581da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds if (!dev->interrupt_out_busy) { 5611da177e4SLinus Torvalds mask |= POLLOUT | POLLWRNORM; 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds dbg(2, "%s: leave, mask = %d", __FUNCTION__, mask); 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvalds return mask; 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /** 5711da177e4SLinus Torvalds * tower_llseek 5721da177e4SLinus Torvalds */ 5731da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence) 5741da177e4SLinus Torvalds { 5751da177e4SLinus Torvalds return -ESPIPE; /* unseekable */ 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /** 5801da177e4SLinus Torvalds * tower_read 5811da177e4SLinus Torvalds */ 5821da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) 5831da177e4SLinus Torvalds { 5841da177e4SLinus Torvalds struct lego_usb_tower *dev; 5851da177e4SLinus Torvalds size_t bytes_to_read; 5861da177e4SLinus Torvalds int i; 5871da177e4SLinus Torvalds int retval = 0; 5881da177e4SLinus Torvalds unsigned long timeout = 0; 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds dbg(2, "%s: enter, count = %Zd", __FUNCTION__, count); 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds dev = (struct lego_usb_tower *)file->private_data; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds /* lock this object */ 5951da177e4SLinus Torvalds if (down_interruptible (&dev->sem)) { 5961da177e4SLinus Torvalds retval = -ERESTARTSYS; 5971da177e4SLinus Torvalds goto exit; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6011da177e4SLinus Torvalds if (dev->udev == NULL) { 6021da177e4SLinus Torvalds retval = -ENODEV; 6031da177e4SLinus Torvalds err("No device or device unplugged %d", retval); 6041da177e4SLinus Torvalds goto unlock_exit; 6051da177e4SLinus Torvalds } 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds /* verify that we actually have some data to read */ 6081da177e4SLinus Torvalds if (count == 0) { 6091da177e4SLinus Torvalds dbg(1, "%s: read request of 0 bytes", __FUNCTION__); 6101da177e4SLinus Torvalds goto unlock_exit; 6111da177e4SLinus Torvalds } 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds if (read_timeout) { 6141da177e4SLinus Torvalds timeout = jiffies + read_timeout * HZ / 1000; 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds 6171da177e4SLinus Torvalds /* wait for data */ 6181da177e4SLinus Torvalds tower_check_for_read_packet (dev); 6191da177e4SLinus Torvalds while (dev->read_packet_length == 0) { 6201da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 6211da177e4SLinus Torvalds retval = -EAGAIN; 6221da177e4SLinus Torvalds goto unlock_exit; 6231da177e4SLinus Torvalds } 6241da177e4SLinus Torvalds retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); 6251da177e4SLinus Torvalds if (retval < 0) { 6261da177e4SLinus Torvalds goto unlock_exit; 6271da177e4SLinus Torvalds } 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds /* reset read timeout during read or write activity */ 6301da177e4SLinus Torvalds if (read_timeout 6311da177e4SLinus Torvalds && (dev->read_buffer_length || dev->interrupt_out_busy)) { 6321da177e4SLinus Torvalds timeout = jiffies + read_timeout * HZ / 1000; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds /* check for read timeout */ 6351da177e4SLinus Torvalds if (read_timeout && time_after (jiffies, timeout)) { 6361da177e4SLinus Torvalds retval = -ETIMEDOUT; 6371da177e4SLinus Torvalds goto unlock_exit; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds tower_check_for_read_packet (dev); 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds /* copy the data from read_buffer into userspace */ 6431da177e4SLinus Torvalds bytes_to_read = min(count, dev->read_packet_length); 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { 6461da177e4SLinus Torvalds retval = -EFAULT; 6471da177e4SLinus Torvalds goto unlock_exit; 6481da177e4SLinus Torvalds } 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 6511da177e4SLinus Torvalds dev->read_buffer_length -= bytes_to_read; 6521da177e4SLinus Torvalds dev->read_packet_length -= bytes_to_read; 6531da177e4SLinus Torvalds for (i=0; i<dev->read_buffer_length; i++) { 6541da177e4SLinus Torvalds dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; 6551da177e4SLinus Torvalds } 6561da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds retval = bytes_to_read; 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds unlock_exit: 6611da177e4SLinus Torvalds /* unlock the device */ 6621da177e4SLinus Torvalds up (&dev->sem); 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds exit: 6651da177e4SLinus Torvalds dbg(2, "%s: leave, return value %d", __FUNCTION__, retval); 6661da177e4SLinus Torvalds return retval; 6671da177e4SLinus Torvalds } 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds /** 6711da177e4SLinus Torvalds * tower_write 6721da177e4SLinus Torvalds */ 6731da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 6741da177e4SLinus Torvalds { 6751da177e4SLinus Torvalds struct lego_usb_tower *dev; 6761da177e4SLinus Torvalds size_t bytes_to_write; 6771da177e4SLinus Torvalds int retval = 0; 6781da177e4SLinus Torvalds 6791da177e4SLinus Torvalds dbg(2, "%s: enter, count = %Zd", __FUNCTION__, count); 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds dev = (struct lego_usb_tower *)file->private_data; 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* lock this object */ 6841da177e4SLinus Torvalds if (down_interruptible (&dev->sem)) { 6851da177e4SLinus Torvalds retval = -ERESTARTSYS; 6861da177e4SLinus Torvalds goto exit; 6871da177e4SLinus Torvalds } 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6901da177e4SLinus Torvalds if (dev->udev == NULL) { 6911da177e4SLinus Torvalds retval = -ENODEV; 6921da177e4SLinus Torvalds err("No device or device unplugged %d", retval); 6931da177e4SLinus Torvalds goto unlock_exit; 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds /* verify that we actually have some data to write */ 6971da177e4SLinus Torvalds if (count == 0) { 6981da177e4SLinus Torvalds dbg(1, "%s: write request of 0 bytes", __FUNCTION__); 6991da177e4SLinus Torvalds goto unlock_exit; 7001da177e4SLinus Torvalds } 7011da177e4SLinus Torvalds 7021da177e4SLinus Torvalds /* wait until previous transfer is finished */ 7031da177e4SLinus Torvalds while (dev->interrupt_out_busy) { 7041da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 7051da177e4SLinus Torvalds retval = -EAGAIN; 7061da177e4SLinus Torvalds goto unlock_exit; 7071da177e4SLinus Torvalds } 7081da177e4SLinus Torvalds retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); 7091da177e4SLinus Torvalds if (retval) { 7101da177e4SLinus Torvalds goto unlock_exit; 7111da177e4SLinus Torvalds } 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds 7141da177e4SLinus Torvalds /* write the data into interrupt_out_buffer from userspace */ 7151da177e4SLinus Torvalds bytes_to_write = min_t(int, count, write_buffer_size); 7161da177e4SLinus Torvalds dbg(4, "%s: count = %Zd, bytes_to_write = %Zd", __FUNCTION__, count, bytes_to_write); 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { 7191da177e4SLinus Torvalds retval = -EFAULT; 7201da177e4SLinus Torvalds goto unlock_exit; 7211da177e4SLinus Torvalds } 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds /* send off the urb */ 7241da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_out_urb, 7251da177e4SLinus Torvalds dev->udev, 7261da177e4SLinus Torvalds usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 7271da177e4SLinus Torvalds dev->interrupt_out_buffer, 7281da177e4SLinus Torvalds bytes_to_write, 7291da177e4SLinus Torvalds tower_interrupt_out_callback, 7301da177e4SLinus Torvalds dev, 7311da177e4SLinus Torvalds dev->interrupt_out_interval); 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds dev->interrupt_out_busy = 1; 7341da177e4SLinus Torvalds wmb(); 7351da177e4SLinus Torvalds 7361da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); 7371da177e4SLinus Torvalds if (retval) { 7381da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7391da177e4SLinus Torvalds err("Couldn't submit interrupt_out_urb %d", retval); 7401da177e4SLinus Torvalds goto unlock_exit; 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds retval = bytes_to_write; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds unlock_exit: 7451da177e4SLinus Torvalds /* unlock the device */ 7461da177e4SLinus Torvalds up (&dev->sem); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds exit: 7491da177e4SLinus Torvalds dbg(2, "%s: leave, return value %d", __FUNCTION__, retval); 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds return retval; 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds /** 7561da177e4SLinus Torvalds * tower_interrupt_in_callback 7571da177e4SLinus Torvalds */ 7581da177e4SLinus Torvalds static void tower_interrupt_in_callback (struct urb *urb, struct pt_regs *regs) 7591da177e4SLinus Torvalds { 7601da177e4SLinus Torvalds struct lego_usb_tower *dev = (struct lego_usb_tower *)urb->context; 7611da177e4SLinus Torvalds int retval; 7621da177e4SLinus Torvalds 7631da177e4SLinus Torvalds dbg(4, "%s: enter, status %d", __FUNCTION__, urb->status); 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds lego_usb_tower_debug_data(5, __FUNCTION__, urb->actual_length, urb->transfer_buffer); 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds if (urb->status) { 7681da177e4SLinus Torvalds if (urb->status == -ENOENT || 7691da177e4SLinus Torvalds urb->status == -ECONNRESET || 7701da177e4SLinus Torvalds urb->status == -ESHUTDOWN) { 7711da177e4SLinus Torvalds goto exit; 7721da177e4SLinus Torvalds } else { 7731da177e4SLinus Torvalds dbg(1, "%s: nonzero status received: %d", __FUNCTION__, urb->status); 7741da177e4SLinus Torvalds goto resubmit; /* maybe we can recover */ 7751da177e4SLinus Torvalds } 7761da177e4SLinus Torvalds } 7771da177e4SLinus Torvalds 7781da177e4SLinus Torvalds if (urb->actual_length > 0) { 7791da177e4SLinus Torvalds spin_lock (&dev->read_buffer_lock); 7801da177e4SLinus Torvalds if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { 7811da177e4SLinus Torvalds memcpy (dev->read_buffer + dev->read_buffer_length, 7821da177e4SLinus Torvalds dev->interrupt_in_buffer, 7831da177e4SLinus Torvalds urb->actual_length); 7841da177e4SLinus Torvalds dev->read_buffer_length += urb->actual_length; 7851da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 7861da177e4SLinus Torvalds dbg(3, "%s: received %d bytes", __FUNCTION__, urb->actual_length); 7871da177e4SLinus Torvalds } else { 7881da177e4SLinus Torvalds printk(KERN_WARNING "%s: read_buffer overflow, %d bytes dropped", __FUNCTION__, urb->actual_length); 7891da177e4SLinus Torvalds } 7901da177e4SLinus Torvalds spin_unlock (&dev->read_buffer_lock); 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 7931da177e4SLinus Torvalds resubmit: 7941da177e4SLinus Torvalds /* resubmit if we're still running */ 7951da177e4SLinus Torvalds if (dev->interrupt_in_running && dev->udev) { 7961da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); 7971da177e4SLinus Torvalds if (retval) { 7981da177e4SLinus Torvalds err("%s: usb_submit_urb failed (%d)", __FUNCTION__, retval); 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds } 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds exit: 8031da177e4SLinus Torvalds dev->interrupt_in_done = 1; 8041da177e4SLinus Torvalds wake_up_interruptible (&dev->read_wait); 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvalds lego_usb_tower_debug_data(5, __FUNCTION__, urb->actual_length, urb->transfer_buffer); 8071da177e4SLinus Torvalds dbg(4, "%s: leave, status %d", __FUNCTION__, urb->status); 8081da177e4SLinus Torvalds } 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvalds /** 8121da177e4SLinus Torvalds * tower_interrupt_out_callback 8131da177e4SLinus Torvalds */ 8141da177e4SLinus Torvalds static void tower_interrupt_out_callback (struct urb *urb, struct pt_regs *regs) 8151da177e4SLinus Torvalds { 8161da177e4SLinus Torvalds struct lego_usb_tower *dev = (struct lego_usb_tower *)urb->context; 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds dbg(4, "%s: enter, status %d", __FUNCTION__, urb->status); 8191da177e4SLinus Torvalds lego_usb_tower_debug_data(5, __FUNCTION__, urb->actual_length, urb->transfer_buffer); 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds /* sync/async unlink faults aren't errors */ 8221da177e4SLinus Torvalds if (urb->status && !(urb->status == -ENOENT || 8231da177e4SLinus Torvalds urb->status == -ECONNRESET || 8241da177e4SLinus Torvalds urb->status == -ESHUTDOWN)) { 8251da177e4SLinus Torvalds dbg(1, "%s - nonzero write bulk status received: %d", 8261da177e4SLinus Torvalds __FUNCTION__, urb->status); 8271da177e4SLinus Torvalds } 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 8301da177e4SLinus Torvalds wake_up_interruptible(&dev->write_wait); 8311da177e4SLinus Torvalds 8321da177e4SLinus Torvalds lego_usb_tower_debug_data(5, __FUNCTION__, urb->actual_length, urb->transfer_buffer); 8331da177e4SLinus Torvalds dbg(4, "%s: leave, status %d", __FUNCTION__, urb->status); 8341da177e4SLinus Torvalds } 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds /** 8381da177e4SLinus Torvalds * tower_probe 8391da177e4SLinus Torvalds * 8401da177e4SLinus Torvalds * Called by the usb core when a new device is connected that it thinks 8411da177e4SLinus Torvalds * this driver might be interested in. 8421da177e4SLinus Torvalds */ 8431da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id) 8441da177e4SLinus Torvalds { 8451da177e4SLinus Torvalds struct usb_device *udev = interface_to_usbdev(interface); 8461da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 8471da177e4SLinus Torvalds struct usb_host_interface *iface_desc; 8481da177e4SLinus Torvalds struct usb_endpoint_descriptor* endpoint; 8491da177e4SLinus Torvalds struct tower_get_version_reply get_version_reply; 8501da177e4SLinus Torvalds int i; 8511da177e4SLinus Torvalds int retval = -ENOMEM; 8521da177e4SLinus Torvalds int result; 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 8551da177e4SLinus Torvalds 8561da177e4SLinus Torvalds if (udev == NULL) { 8571da177e4SLinus Torvalds info ("udev is NULL."); 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds 860093cf723SSteven Cole /* allocate memory for our device state and initialize it */ 8611da177e4SLinus Torvalds 8621da177e4SLinus Torvalds dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds if (dev == NULL) { 8651da177e4SLinus Torvalds err ("Out of memory"); 8661da177e4SLinus Torvalds goto exit; 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds init_MUTEX (&dev->sem); 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds dev->udev = udev; 8721da177e4SLinus Torvalds dev->open_count = 0; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds dev->read_buffer = NULL; 8751da177e4SLinus Torvalds dev->read_buffer_length = 0; 8761da177e4SLinus Torvalds dev->read_packet_length = 0; 8771da177e4SLinus Torvalds spin_lock_init (&dev->read_buffer_lock); 8781da177e4SLinus Torvalds dev->packet_timeout_jiffies = packet_timeout * HZ / 1000; 8791da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds init_waitqueue_head (&dev->read_wait); 8821da177e4SLinus Torvalds init_waitqueue_head (&dev->write_wait); 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds dev->interrupt_in_buffer = NULL; 8851da177e4SLinus Torvalds dev->interrupt_in_endpoint = NULL; 8861da177e4SLinus Torvalds dev->interrupt_in_urb = NULL; 8871da177e4SLinus Torvalds dev->interrupt_in_running = 0; 8881da177e4SLinus Torvalds dev->interrupt_in_done = 0; 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds dev->interrupt_out_buffer = NULL; 8911da177e4SLinus Torvalds dev->interrupt_out_endpoint = NULL; 8921da177e4SLinus Torvalds dev->interrupt_out_urb = NULL; 8931da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds iface_desc = interface->cur_altsetting; 8961da177e4SLinus Torvalds 8971da177e4SLinus Torvalds /* set up the endpoint information */ 8981da177e4SLinus Torvalds for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 8991da177e4SLinus Torvalds endpoint = &iface_desc->endpoint[i].desc; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) && 9021da177e4SLinus Torvalds ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 9031da177e4SLinus Torvalds dev->interrupt_in_endpoint = endpoint; 9041da177e4SLinus Torvalds } 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) && 9071da177e4SLinus Torvalds ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { 9081da177e4SLinus Torvalds dev->interrupt_out_endpoint = endpoint; 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds } 9111da177e4SLinus Torvalds if(dev->interrupt_in_endpoint == NULL) { 9121da177e4SLinus Torvalds err("interrupt in endpoint not found"); 9131da177e4SLinus Torvalds goto error; 9141da177e4SLinus Torvalds } 9151da177e4SLinus Torvalds if (dev->interrupt_out_endpoint == NULL) { 9161da177e4SLinus Torvalds err("interrupt out endpoint not found"); 9171da177e4SLinus Torvalds goto error; 9181da177e4SLinus Torvalds } 9191da177e4SLinus Torvalds 9201da177e4SLinus Torvalds dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); 9211da177e4SLinus Torvalds if (!dev->read_buffer) { 9221da177e4SLinus Torvalds err("Couldn't allocate read_buffer"); 9231da177e4SLinus Torvalds goto error; 9241da177e4SLinus Torvalds } 9251da177e4SLinus Torvalds dev->interrupt_in_buffer = kmalloc (le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), GFP_KERNEL); 9261da177e4SLinus Torvalds if (!dev->interrupt_in_buffer) { 9271da177e4SLinus Torvalds err("Couldn't allocate interrupt_in_buffer"); 9281da177e4SLinus Torvalds goto error; 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 9311da177e4SLinus Torvalds if (!dev->interrupt_in_urb) { 9321da177e4SLinus Torvalds err("Couldn't allocate interrupt_in_urb"); 9331da177e4SLinus Torvalds goto error; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); 9361da177e4SLinus Torvalds if (!dev->interrupt_out_buffer) { 9371da177e4SLinus Torvalds err("Couldn't allocate interrupt_out_buffer"); 9381da177e4SLinus Torvalds goto error; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 9411da177e4SLinus Torvalds if (!dev->interrupt_out_urb) { 9421da177e4SLinus Torvalds err("Couldn't allocate interrupt_out_urb"); 9431da177e4SLinus Torvalds goto error; 9441da177e4SLinus Torvalds } 9451da177e4SLinus Torvalds dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 9461da177e4SLinus Torvalds dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds /* we can register the device now, as it is ready */ 9491da177e4SLinus Torvalds usb_set_intfdata (interface, dev); 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds retval = usb_register_dev (interface, &tower_class); 9521da177e4SLinus Torvalds 9531da177e4SLinus Torvalds if (retval) { 9541da177e4SLinus Torvalds /* something prevented us from registering this driver */ 9551da177e4SLinus Torvalds err ("Not able to get a minor for this device."); 9561da177e4SLinus Torvalds usb_set_intfdata (interface, NULL); 9571da177e4SLinus Torvalds goto error; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds dev->minor = interface->minor; 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds /* let the user know what node this device is now attached to */ 9621da177e4SLinus Torvalds info ("LEGO USB Tower #%d now attached to major %d minor %d", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), USB_MAJOR, dev->minor); 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds /* get the firmware version and log it */ 9651da177e4SLinus Torvalds result = usb_control_msg (udev, 9661da177e4SLinus Torvalds usb_rcvctrlpipe(udev, 0), 9671da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_GET_VERSION, 9681da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 9691da177e4SLinus Torvalds 0, 9701da177e4SLinus Torvalds 0, 9711da177e4SLinus Torvalds &get_version_reply, 9721da177e4SLinus Torvalds sizeof(get_version_reply), 9731da177e4SLinus Torvalds 1000); 9741da177e4SLinus Torvalds if (result < 0) { 9751da177e4SLinus Torvalds err("LEGO USB Tower get version control request failed"); 9761da177e4SLinus Torvalds retval = result; 9771da177e4SLinus Torvalds goto error; 9781da177e4SLinus Torvalds } 9791da177e4SLinus Torvalds info("LEGO USB Tower firmware version is %d.%d build %d", 9801da177e4SLinus Torvalds get_version_reply.major, 9811da177e4SLinus Torvalds get_version_reply.minor, 9821da177e4SLinus Torvalds le16_to_cpu(get_version_reply.build_no)); 9831da177e4SLinus Torvalds 9841da177e4SLinus Torvalds 9851da177e4SLinus Torvalds exit: 9861da177e4SLinus Torvalds dbg(2, "%s: leave, return value 0x%.8lx (dev)", __FUNCTION__, (long) dev); 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds return retval; 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds error: 9911da177e4SLinus Torvalds tower_delete(dev); 9921da177e4SLinus Torvalds return retval; 9931da177e4SLinus Torvalds } 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds 9961da177e4SLinus Torvalds /** 9971da177e4SLinus Torvalds * tower_disconnect 9981da177e4SLinus Torvalds * 9991da177e4SLinus Torvalds * Called by the usb core when the device is removed from the system. 10001da177e4SLinus Torvalds */ 10011da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface) 10021da177e4SLinus Torvalds { 10031da177e4SLinus Torvalds struct lego_usb_tower *dev; 10041da177e4SLinus Torvalds int minor; 10051da177e4SLinus Torvalds 10061da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 10071da177e4SLinus Torvalds 10084186ecf8SArjan van de Ven mutex_lock (&disconnect_mutex); 10091da177e4SLinus Torvalds 10101da177e4SLinus Torvalds dev = usb_get_intfdata (interface); 10111da177e4SLinus Torvalds usb_set_intfdata (interface, NULL); 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds down (&dev->sem); 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds minor = dev->minor; 10171da177e4SLinus Torvalds 10181da177e4SLinus Torvalds /* give back our minor */ 10191da177e4SLinus Torvalds usb_deregister_dev (interface, &tower_class); 10201da177e4SLinus Torvalds 10211da177e4SLinus Torvalds /* if the device is not opened, then we clean up right now */ 10221da177e4SLinus Torvalds if (!dev->open_count) { 10231da177e4SLinus Torvalds up (&dev->sem); 10241da177e4SLinus Torvalds tower_delete (dev); 10251da177e4SLinus Torvalds } else { 10261da177e4SLinus Torvalds dev->udev = NULL; 10271da177e4SLinus Torvalds up (&dev->sem); 10281da177e4SLinus Torvalds } 10291da177e4SLinus Torvalds 10304186ecf8SArjan van de Ven mutex_unlock (&disconnect_mutex); 10311da177e4SLinus Torvalds 10321da177e4SLinus Torvalds info("LEGO USB Tower #%d now disconnected", (minor - LEGO_USB_TOWER_MINOR_BASE)); 10331da177e4SLinus Torvalds 10341da177e4SLinus Torvalds dbg(2, "%s: leave", __FUNCTION__); 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds /** 10401da177e4SLinus Torvalds * lego_usb_tower_init 10411da177e4SLinus Torvalds */ 10421da177e4SLinus Torvalds static int __init lego_usb_tower_init(void) 10431da177e4SLinus Torvalds { 10441da177e4SLinus Torvalds int result; 10451da177e4SLinus Torvalds int retval = 0; 10461da177e4SLinus Torvalds 10471da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 10481da177e4SLinus Torvalds 10491da177e4SLinus Torvalds /* register this driver with the USB subsystem */ 10501da177e4SLinus Torvalds result = usb_register(&tower_driver); 10511da177e4SLinus Torvalds if (result < 0) { 10521da177e4SLinus Torvalds err("usb_register failed for the "__FILE__" driver. Error number %d", result); 10531da177e4SLinus Torvalds retval = -1; 10541da177e4SLinus Torvalds goto exit; 10551da177e4SLinus Torvalds } 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds info(DRIVER_DESC " " DRIVER_VERSION); 10581da177e4SLinus Torvalds 10591da177e4SLinus Torvalds exit: 10601da177e4SLinus Torvalds dbg(2, "%s: leave, return value %d", __FUNCTION__, retval); 10611da177e4SLinus Torvalds 10621da177e4SLinus Torvalds return retval; 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds /** 10671da177e4SLinus Torvalds * lego_usb_tower_exit 10681da177e4SLinus Torvalds */ 10691da177e4SLinus Torvalds static void __exit lego_usb_tower_exit(void) 10701da177e4SLinus Torvalds { 10711da177e4SLinus Torvalds dbg(2, "%s: enter", __FUNCTION__); 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds /* deregister this driver with the USB subsystem */ 10741da177e4SLinus Torvalds usb_deregister (&tower_driver); 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds dbg(2, "%s: leave", __FUNCTION__); 10771da177e4SLinus Torvalds } 10781da177e4SLinus Torvalds 10791da177e4SLinus Torvalds module_init (lego_usb_tower_init); 10801da177e4SLinus Torvalds module_exit (lego_usb_tower_exit); 10811da177e4SLinus Torvalds 10821da177e4SLinus Torvalds MODULE_AUTHOR(DRIVER_AUTHOR); 10831da177e4SLinus Torvalds MODULE_DESCRIPTION(DRIVER_DESC); 10841da177e4SLinus Torvalds #ifdef MODULE_LICENSE 10851da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 10861da177e4SLinus Torvalds #endif 1087