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 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/completion.h> 844186ecf8SArjan van de Ven #include <linux/mutex.h> 851da177e4SLinus Torvalds #include <asm/uaccess.h> 861da177e4SLinus Torvalds #include <linux/usb.h> 871da177e4SLinus Torvalds #include <linux/poll.h> 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds #ifdef CONFIG_USB_DEBUG 911da177e4SLinus Torvalds static int debug = 4; 921da177e4SLinus Torvalds #else 931da177e4SLinus Torvalds static int debug = 0; 941da177e4SLinus Torvalds #endif 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* Use our own dbg macro */ 971da177e4SLinus Torvalds #undef dbg 981da177e4SLinus Torvalds #define dbg(lvl, format, arg...) do { if (debug >= lvl) printk(KERN_DEBUG __FILE__ ": " format "\n", ## arg); } while (0) 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds /* Version Information */ 1021da177e4SLinus Torvalds #define DRIVER_VERSION "v0.96" 1031da177e4SLinus Torvalds #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" 1041da177e4SLinus Torvalds #define DRIVER_DESC "LEGO USB Tower Driver" 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds /* Module parameters */ 1071da177e4SLinus Torvalds module_param(debug, int, S_IRUGO | S_IWUSR); 1081da177e4SLinus Torvalds MODULE_PARM_DESC(debug, "Debug enabled or not"); 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* The defaults are chosen to work with the latest versions of leJOS and NQC. 1111da177e4SLinus Torvalds */ 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* Some legacy software likes to receive packets in one piece. 1141da177e4SLinus Torvalds * In this case read_buffer_size should exceed the maximal packet length 1151da177e4SLinus Torvalds * (417 for datalog uploads), and packet_timeout should be set. 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds static int read_buffer_size = 480; 1181da177e4SLinus Torvalds module_param(read_buffer_size, int, 0); 1191da177e4SLinus Torvalds MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* Some legacy software likes to send packets in one piece. 1221da177e4SLinus Torvalds * In this case write_buffer_size should exceed the maximal packet length 1231da177e4SLinus Torvalds * (417 for firmware and program downloads). 1241da177e4SLinus Torvalds * A problem with long writes is that the following read may time out 1251da177e4SLinus Torvalds * if the software is not prepared to wait long enough. 1261da177e4SLinus Torvalds */ 1271da177e4SLinus Torvalds static int write_buffer_size = 480; 1281da177e4SLinus Torvalds module_param(write_buffer_size, int, 0); 1291da177e4SLinus Torvalds MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds /* Some legacy software expects reads to contain whole LASM packets. 1321da177e4SLinus Torvalds * To achieve this, characters which arrive before a packet timeout 1331da177e4SLinus Torvalds * occurs will be returned in a single read operation. 1341da177e4SLinus Torvalds * A problem with long reads is that the software may time out 1351da177e4SLinus Torvalds * if it is not prepared to wait long enough. 1361da177e4SLinus Torvalds * The packet timeout should be greater than the time between the 1371da177e4SLinus Torvalds * reception of subsequent characters, which should arrive about 1381da177e4SLinus Torvalds * every 5ms for the standard 2400 baud. 1391da177e4SLinus Torvalds * Set it to 0 to disable. 1401da177e4SLinus Torvalds */ 1411da177e4SLinus Torvalds static int packet_timeout = 50; 1421da177e4SLinus Torvalds module_param(packet_timeout, int, 0); 1431da177e4SLinus Torvalds MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* Some legacy software expects blocking reads to time out. 1461da177e4SLinus Torvalds * Timeout occurs after the specified time of read and write inactivity. 1471da177e4SLinus Torvalds * Set it to 0 to disable. 1481da177e4SLinus Torvalds */ 1491da177e4SLinus Torvalds static int read_timeout = 200; 1501da177e4SLinus Torvalds module_param(read_timeout, int, 0); 1511da177e4SLinus Torvalds MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* As of kernel version 2.6.4 ehci-hcd uses an 1541da177e4SLinus Torvalds * "only one interrupt transfer per frame" shortcut 1551da177e4SLinus Torvalds * to simplify the scheduling of periodic transfers. 1561da177e4SLinus Torvalds * This conflicts with our standard 1ms intervals for in and out URBs. 1571da177e4SLinus Torvalds * We use default intervals of 2ms for in and 8ms for out transfers, 1581da177e4SLinus Torvalds * which is fast enough for 2400 baud and allows a small additional load. 1591da177e4SLinus Torvalds * Increase the interval to allow more devices that do interrupt transfers, 1601da177e4SLinus Torvalds * or set to 0 to use the standard interval from the endpoint descriptors. 1611da177e4SLinus Torvalds */ 1621da177e4SLinus Torvalds static int interrupt_in_interval = 2; 1631da177e4SLinus Torvalds module_param(interrupt_in_interval, int, 0); 1641da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds static int interrupt_out_interval = 8; 1671da177e4SLinus Torvalds module_param(interrupt_out_interval, int, 0); 1681da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds /* Define these values to match your device */ 1711da177e4SLinus Torvalds #define LEGO_USB_TOWER_VENDOR_ID 0x0694 1721da177e4SLinus Torvalds #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds /* Vendor requests */ 1751da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_RESET 0x04 1761da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds struct tower_reset_reply { 1791da177e4SLinus Torvalds __le16 size; /* little-endian */ 1801da177e4SLinus Torvalds __u8 err_code; 1811da177e4SLinus Torvalds __u8 spare; 1821da177e4SLinus Torvalds } __attribute__ ((packed)); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds struct tower_get_version_reply { 1851da177e4SLinus Torvalds __le16 size; /* little-endian */ 1861da177e4SLinus Torvalds __u8 err_code; 1871da177e4SLinus Torvalds __u8 spare; 1881da177e4SLinus Torvalds __u8 major; 1891da177e4SLinus Torvalds __u8 minor; 1901da177e4SLinus Torvalds __le16 build_no; /* little-endian */ 1911da177e4SLinus Torvalds } __attribute__ ((packed)); 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds /* table of devices that work with this driver */ 1951da177e4SLinus Torvalds static struct usb_device_id tower_table [] = { 1961da177e4SLinus Torvalds { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, 1971da177e4SLinus Torvalds { } /* Terminating entry */ 1981da177e4SLinus Torvalds }; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, tower_table); 20178663eccSOliver Neukum static DEFINE_MUTEX(open_disc_mutex); 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 { 20818bcbcfeSDaniel Walker struct mutex lock; /* 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); 2517d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb); 2527d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb); 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 /* file operations needed when we register this driver */ 259066202ddSLuiz Fernando N. Capitulino static const struct file_operations tower_fops = { 2601da177e4SLinus Torvalds .owner = THIS_MODULE, 2611da177e4SLinus Torvalds .read = tower_read, 2621da177e4SLinus Torvalds .write = tower_write, 2631da177e4SLinus Torvalds .open = tower_open, 2641da177e4SLinus Torvalds .release = tower_release, 2651da177e4SLinus Torvalds .poll = tower_poll, 2661da177e4SLinus Torvalds .llseek = tower_llseek, 2671da177e4SLinus Torvalds }; 2681da177e4SLinus Torvalds 269e454cea2SKay Sievers static char *legousbtower_devnode(struct device *dev, mode_t *mode) 270f7a386c5SKay Sievers { 271f7a386c5SKay Sievers return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 272f7a386c5SKay Sievers } 273f7a386c5SKay Sievers 2741da177e4SLinus Torvalds /* 2751da177e4SLinus Torvalds * usb class driver info in order to get a minor number from the usb core, 276d6e5bcf4SGreg Kroah-Hartman * and to have the device registered with the driver core 2771da177e4SLinus Torvalds */ 2781da177e4SLinus Torvalds static struct usb_class_driver tower_class = { 279d6e5bcf4SGreg Kroah-Hartman .name = "legousbtower%d", 280e454cea2SKay Sievers .devnode = legousbtower_devnode, 2811da177e4SLinus Torvalds .fops = &tower_fops, 2821da177e4SLinus Torvalds .minor_base = LEGO_USB_TOWER_MINOR_BASE, 2831da177e4SLinus Torvalds }; 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds 2861da177e4SLinus Torvalds /* usb specific object needed to register this driver with the usb subsystem */ 2871da177e4SLinus Torvalds static struct usb_driver tower_driver = { 2881da177e4SLinus Torvalds .name = "legousbtower", 2891da177e4SLinus Torvalds .probe = tower_probe, 2901da177e4SLinus Torvalds .disconnect = tower_disconnect, 2911da177e4SLinus Torvalds .id_table = tower_table, 2921da177e4SLinus Torvalds }; 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds /** 2961da177e4SLinus Torvalds * lego_usb_tower_debug_data 2971da177e4SLinus Torvalds */ 2981da177e4SLinus Torvalds static inline void lego_usb_tower_debug_data (int level, const char *function, int size, const unsigned char *data) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds int i; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds if (debug < level) 3031da177e4SLinus Torvalds return; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds printk (KERN_DEBUG __FILE__": %s - length = %d, data = ", function, size); 3061da177e4SLinus Torvalds for (i = 0; i < size; ++i) { 3071da177e4SLinus Torvalds printk ("%.2x ", data[i]); 3081da177e4SLinus Torvalds } 3091da177e4SLinus Torvalds printk ("\n"); 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds /** 3141da177e4SLinus Torvalds * tower_delete 3151da177e4SLinus Torvalds */ 3161da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev) 3171da177e4SLinus Torvalds { 318441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds tower_abort_transfers (dev); 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds /* free data structures */ 3231da177e4SLinus Torvalds usb_free_urb(dev->interrupt_in_urb); 3241da177e4SLinus Torvalds usb_free_urb(dev->interrupt_out_urb); 3251da177e4SLinus Torvalds kfree (dev->read_buffer); 3261da177e4SLinus Torvalds kfree (dev->interrupt_in_buffer); 3271da177e4SLinus Torvalds kfree (dev->interrupt_out_buffer); 3281da177e4SLinus Torvalds kfree (dev); 3291da177e4SLinus Torvalds 330441b62c1SHarvey Harrison dbg(2, "%s: leave", __func__); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds /** 3351da177e4SLinus Torvalds * tower_open 3361da177e4SLinus Torvalds */ 3371da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file) 3381da177e4SLinus Torvalds { 3391da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 3401da177e4SLinus Torvalds int subminor; 3411da177e4SLinus Torvalds int retval = 0; 3421da177e4SLinus Torvalds struct usb_interface *interface; 3431da177e4SLinus Torvalds struct tower_reset_reply reset_reply; 3441da177e4SLinus Torvalds int result; 3451da177e4SLinus Torvalds 346441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds nonseekable_open(inode, file); 3491da177e4SLinus Torvalds subminor = iminor(inode); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds interface = usb_find_interface (&tower_driver, subminor); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds if (!interface) { 3541da177e4SLinus Torvalds err ("%s - error, can't find device for minor %d", 355441b62c1SHarvey Harrison __func__, subminor); 3561da177e4SLinus Torvalds retval = -ENODEV; 357d4ead16fSAlan Stern goto exit; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 36078663eccSOliver Neukum mutex_lock(&open_disc_mutex); 3611da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds if (!dev) { 36478663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3651da177e4SLinus Torvalds retval = -ENODEV; 366d4ead16fSAlan Stern goto exit; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds /* lock this device */ 37018bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 37178663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3721da177e4SLinus Torvalds retval = -ERESTARTSYS; 373d4ead16fSAlan Stern goto exit; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds 37678663eccSOliver Neukum 3771da177e4SLinus Torvalds /* allow opening only once */ 3781da177e4SLinus Torvalds if (dev->open_count) { 37978663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3801da177e4SLinus Torvalds retval = -EBUSY; 3811da177e4SLinus Torvalds goto unlock_exit; 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds dev->open_count = 1; 38478663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds /* reset the tower */ 3871da177e4SLinus Torvalds result = usb_control_msg (dev->udev, 3881da177e4SLinus Torvalds usb_rcvctrlpipe(dev->udev, 0), 3891da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_RESET, 3901da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 3911da177e4SLinus Torvalds 0, 3921da177e4SLinus Torvalds 0, 3931da177e4SLinus Torvalds &reset_reply, 3941da177e4SLinus Torvalds sizeof(reset_reply), 3951da177e4SLinus Torvalds 1000); 3961da177e4SLinus Torvalds if (result < 0) { 3971da177e4SLinus Torvalds err("LEGO USB Tower reset control request failed"); 3981da177e4SLinus Torvalds retval = result; 3991da177e4SLinus Torvalds goto unlock_exit; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* initialize in direction */ 4031da177e4SLinus Torvalds dev->read_buffer_length = 0; 4041da177e4SLinus Torvalds dev->read_packet_length = 0; 4051da177e4SLinus Torvalds usb_fill_int_urb (dev->interrupt_in_urb, 4061da177e4SLinus Torvalds dev->udev, 4071da177e4SLinus Torvalds usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), 4081da177e4SLinus Torvalds dev->interrupt_in_buffer, 4091da177e4SLinus Torvalds le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), 4101da177e4SLinus Torvalds tower_interrupt_in_callback, 4111da177e4SLinus Torvalds dev, 4121da177e4SLinus Torvalds dev->interrupt_in_interval); 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds dev->interrupt_in_running = 1; 4151da177e4SLinus Torvalds dev->interrupt_in_done = 0; 4161da177e4SLinus Torvalds mb(); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); 4191da177e4SLinus Torvalds if (retval) { 4201da177e4SLinus Torvalds err("Couldn't submit interrupt_in_urb %d", retval); 4211da177e4SLinus Torvalds dev->interrupt_in_running = 0; 4221da177e4SLinus Torvalds dev->open_count = 0; 4231da177e4SLinus Torvalds goto unlock_exit; 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /* save device in the file's private structure */ 4271da177e4SLinus Torvalds file->private_data = dev; 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds unlock_exit: 43018bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4311da177e4SLinus Torvalds 432d4ead16fSAlan Stern exit: 433441b62c1SHarvey Harrison dbg(2, "%s: leave, return value %d ", __func__, retval); 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds return retval; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /** 4391da177e4SLinus Torvalds * tower_release 4401da177e4SLinus Torvalds */ 4411da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file) 4421da177e4SLinus Torvalds { 4431da177e4SLinus Torvalds struct lego_usb_tower *dev; 4441da177e4SLinus Torvalds int retval = 0; 4451da177e4SLinus Torvalds 446441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds dev = (struct lego_usb_tower *)file->private_data; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds if (dev == NULL) { 451441b62c1SHarvey Harrison dbg(1, "%s: object is NULL", __func__); 4521da177e4SLinus Torvalds retval = -ENODEV; 45378663eccSOliver Neukum goto exit_nolock; 4541da177e4SLinus Torvalds } 4551da177e4SLinus Torvalds 45678663eccSOliver Neukum mutex_lock(&open_disc_mutex); 45718bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 4581da177e4SLinus Torvalds retval = -ERESTARTSYS; 4591da177e4SLinus Torvalds goto exit; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds if (dev->open_count != 1) { 463441b62c1SHarvey Harrison dbg(1, "%s: device not opened exactly once", __func__); 4641da177e4SLinus Torvalds retval = -ENODEV; 4651da177e4SLinus Torvalds goto unlock_exit; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds if (dev->udev == NULL) { 4681da177e4SLinus Torvalds /* the device was unplugged before the file was released */ 46918bcbcfeSDaniel Walker 47018bcbcfeSDaniel Walker /* unlock here as tower_delete frees dev */ 47118bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4721da177e4SLinus Torvalds tower_delete (dev); 4731da177e4SLinus Torvalds goto exit; 4741da177e4SLinus Torvalds } 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds /* wait until write transfer is finished */ 4771da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 4781da177e4SLinus Torvalds wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds tower_abort_transfers (dev); 4811da177e4SLinus Torvalds dev->open_count = 0; 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds unlock_exit: 48418bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4851da177e4SLinus Torvalds 4861da177e4SLinus Torvalds exit: 48778663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 48878663eccSOliver Neukum exit_nolock: 489441b62c1SHarvey Harrison dbg(2, "%s: leave, return value %d", __func__, retval); 4901da177e4SLinus Torvalds return retval; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds /** 4951da177e4SLinus Torvalds * tower_abort_transfers 4961da177e4SLinus Torvalds * aborts transfers and frees associated data structures 4971da177e4SLinus Torvalds */ 4981da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev) 4991da177e4SLinus Torvalds { 500441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds if (dev == NULL) { 503441b62c1SHarvey Harrison dbg(1, "%s: dev is null", __func__); 5041da177e4SLinus Torvalds goto exit; 5051da177e4SLinus Torvalds } 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /* shutdown transfer */ 5081da177e4SLinus Torvalds if (dev->interrupt_in_running) { 5091da177e4SLinus Torvalds dev->interrupt_in_running = 0; 5101da177e4SLinus Torvalds mb(); 511f53510e8SMariusz Kozlowski if (dev->udev) 5121da177e4SLinus Torvalds usb_kill_urb (dev->interrupt_in_urb); 5131da177e4SLinus Torvalds } 514f53510e8SMariusz Kozlowski if (dev->interrupt_out_busy && dev->udev) 5151da177e4SLinus Torvalds usb_kill_urb(dev->interrupt_out_urb); 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds exit: 518441b62c1SHarvey Harrison dbg(2, "%s: leave", __func__); 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds /** 5231da177e4SLinus Torvalds * tower_check_for_read_packet 5241da177e4SLinus Torvalds * 5251da177e4SLinus Torvalds * To get correct semantics for signals and non-blocking I/O 5261da177e4SLinus Torvalds * with packetizing we pretend not to see any data in the read buffer 5271da177e4SLinus Torvalds * until it has been there unchanged for at least 5281da177e4SLinus Torvalds * dev->packet_timeout_jiffies, or until the buffer is full. 5291da177e4SLinus Torvalds */ 5301da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev) 5311da177e4SLinus Torvalds { 5321da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 5331da177e4SLinus Torvalds if (!packet_timeout 5341da177e4SLinus Torvalds || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) 5351da177e4SLinus Torvalds || dev->read_buffer_length == read_buffer_size) { 5361da177e4SLinus Torvalds dev->read_packet_length = dev->read_buffer_length; 5371da177e4SLinus Torvalds } 5381da177e4SLinus Torvalds dev->interrupt_in_done = 0; 5391da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds /** 5441da177e4SLinus Torvalds * tower_poll 5451da177e4SLinus Torvalds */ 5461da177e4SLinus Torvalds static unsigned int tower_poll (struct file *file, poll_table *wait) 5471da177e4SLinus Torvalds { 5481da177e4SLinus Torvalds struct lego_usb_tower *dev; 5491da177e4SLinus Torvalds unsigned int mask = 0; 5501da177e4SLinus Torvalds 551441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds dev = file->private_data; 5541da177e4SLinus Torvalds 555d35b4ce1SOliver Neukum if (!dev->udev) 556d35b4ce1SOliver Neukum return POLLERR | POLLHUP; 557d35b4ce1SOliver Neukum 5581da177e4SLinus Torvalds poll_wait(file, &dev->read_wait, wait); 5591da177e4SLinus Torvalds poll_wait(file, &dev->write_wait, wait); 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5621da177e4SLinus Torvalds if (dev->read_packet_length > 0) { 5631da177e4SLinus Torvalds mask |= POLLIN | POLLRDNORM; 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds if (!dev->interrupt_out_busy) { 5661da177e4SLinus Torvalds mask |= POLLOUT | POLLWRNORM; 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds 569441b62c1SHarvey Harrison dbg(2, "%s: leave, mask = %d", __func__, mask); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds return mask; 5721da177e4SLinus Torvalds } 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds /** 5761da177e4SLinus Torvalds * tower_llseek 5771da177e4SLinus Torvalds */ 5781da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence) 5791da177e4SLinus Torvalds { 5801da177e4SLinus Torvalds return -ESPIPE; /* unseekable */ 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds 5841da177e4SLinus Torvalds /** 5851da177e4SLinus Torvalds * tower_read 5861da177e4SLinus Torvalds */ 5871da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) 5881da177e4SLinus Torvalds { 5891da177e4SLinus Torvalds struct lego_usb_tower *dev; 5901da177e4SLinus Torvalds size_t bytes_to_read; 5911da177e4SLinus Torvalds int i; 5921da177e4SLinus Torvalds int retval = 0; 5931da177e4SLinus Torvalds unsigned long timeout = 0; 5941da177e4SLinus Torvalds 595441b62c1SHarvey Harrison dbg(2, "%s: enter, count = %Zd", __func__, count); 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvalds dev = (struct lego_usb_tower *)file->private_data; 5981da177e4SLinus Torvalds 5991da177e4SLinus Torvalds /* lock this object */ 60018bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 6011da177e4SLinus Torvalds retval = -ERESTARTSYS; 6021da177e4SLinus Torvalds goto exit; 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6061da177e4SLinus Torvalds if (dev->udev == NULL) { 6071da177e4SLinus Torvalds retval = -ENODEV; 6081da177e4SLinus Torvalds err("No device or device unplugged %d", retval); 6091da177e4SLinus Torvalds goto unlock_exit; 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds /* verify that we actually have some data to read */ 6131da177e4SLinus Torvalds if (count == 0) { 614441b62c1SHarvey Harrison dbg(1, "%s: read request of 0 bytes", __func__); 6151da177e4SLinus Torvalds goto unlock_exit; 6161da177e4SLinus Torvalds } 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds if (read_timeout) { 6191da177e4SLinus Torvalds timeout = jiffies + read_timeout * HZ / 1000; 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds /* wait for data */ 6231da177e4SLinus Torvalds tower_check_for_read_packet (dev); 6241da177e4SLinus Torvalds while (dev->read_packet_length == 0) { 6251da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 6261da177e4SLinus Torvalds retval = -EAGAIN; 6271da177e4SLinus Torvalds goto unlock_exit; 6281da177e4SLinus Torvalds } 6291da177e4SLinus Torvalds retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); 6301da177e4SLinus Torvalds if (retval < 0) { 6311da177e4SLinus Torvalds goto unlock_exit; 6321da177e4SLinus Torvalds } 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /* reset read timeout during read or write activity */ 6351da177e4SLinus Torvalds if (read_timeout 6361da177e4SLinus Torvalds && (dev->read_buffer_length || dev->interrupt_out_busy)) { 6371da177e4SLinus Torvalds timeout = jiffies + read_timeout * HZ / 1000; 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds /* check for read timeout */ 6401da177e4SLinus Torvalds if (read_timeout && time_after (jiffies, timeout)) { 6411da177e4SLinus Torvalds retval = -ETIMEDOUT; 6421da177e4SLinus Torvalds goto unlock_exit; 6431da177e4SLinus Torvalds } 6441da177e4SLinus Torvalds tower_check_for_read_packet (dev); 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds /* copy the data from read_buffer into userspace */ 6481da177e4SLinus Torvalds bytes_to_read = min(count, dev->read_packet_length); 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { 6511da177e4SLinus Torvalds retval = -EFAULT; 6521da177e4SLinus Torvalds goto unlock_exit; 6531da177e4SLinus Torvalds } 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 6561da177e4SLinus Torvalds dev->read_buffer_length -= bytes_to_read; 6571da177e4SLinus Torvalds dev->read_packet_length -= bytes_to_read; 6581da177e4SLinus Torvalds for (i=0; i<dev->read_buffer_length; i++) { 6591da177e4SLinus Torvalds dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; 6601da177e4SLinus Torvalds } 6611da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds retval = bytes_to_read; 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds unlock_exit: 6661da177e4SLinus Torvalds /* unlock the device */ 66718bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvalds exit: 670441b62c1SHarvey Harrison dbg(2, "%s: leave, return value %d", __func__, retval); 6711da177e4SLinus Torvalds return retval; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /** 6761da177e4SLinus Torvalds * tower_write 6771da177e4SLinus Torvalds */ 6781da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 6791da177e4SLinus Torvalds { 6801da177e4SLinus Torvalds struct lego_usb_tower *dev; 6811da177e4SLinus Torvalds size_t bytes_to_write; 6821da177e4SLinus Torvalds int retval = 0; 6831da177e4SLinus Torvalds 684441b62c1SHarvey Harrison dbg(2, "%s: enter, count = %Zd", __func__, count); 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds dev = (struct lego_usb_tower *)file->private_data; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds /* lock this object */ 68918bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 6901da177e4SLinus Torvalds retval = -ERESTARTSYS; 6911da177e4SLinus Torvalds goto exit; 6921da177e4SLinus Torvalds } 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6951da177e4SLinus Torvalds if (dev->udev == NULL) { 6961da177e4SLinus Torvalds retval = -ENODEV; 6971da177e4SLinus Torvalds err("No device or device unplugged %d", retval); 6981da177e4SLinus Torvalds goto unlock_exit; 6991da177e4SLinus Torvalds } 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /* verify that we actually have some data to write */ 7021da177e4SLinus Torvalds if (count == 0) { 703441b62c1SHarvey Harrison dbg(1, "%s: write request of 0 bytes", __func__); 7041da177e4SLinus Torvalds goto unlock_exit; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds /* wait until previous transfer is finished */ 7081da177e4SLinus Torvalds while (dev->interrupt_out_busy) { 7091da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 7101da177e4SLinus Torvalds retval = -EAGAIN; 7111da177e4SLinus Torvalds goto unlock_exit; 7121da177e4SLinus Torvalds } 7131da177e4SLinus Torvalds retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); 7141da177e4SLinus Torvalds if (retval) { 7151da177e4SLinus Torvalds goto unlock_exit; 7161da177e4SLinus Torvalds } 7171da177e4SLinus Torvalds } 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds /* write the data into interrupt_out_buffer from userspace */ 7201da177e4SLinus Torvalds bytes_to_write = min_t(int, count, write_buffer_size); 721441b62c1SHarvey Harrison dbg(4, "%s: count = %Zd, bytes_to_write = %Zd", __func__, count, bytes_to_write); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { 7241da177e4SLinus Torvalds retval = -EFAULT; 7251da177e4SLinus Torvalds goto unlock_exit; 7261da177e4SLinus Torvalds } 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvalds /* send off the urb */ 7291da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_out_urb, 7301da177e4SLinus Torvalds dev->udev, 7311da177e4SLinus Torvalds usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 7321da177e4SLinus Torvalds dev->interrupt_out_buffer, 7331da177e4SLinus Torvalds bytes_to_write, 7341da177e4SLinus Torvalds tower_interrupt_out_callback, 7351da177e4SLinus Torvalds dev, 7361da177e4SLinus Torvalds dev->interrupt_out_interval); 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds dev->interrupt_out_busy = 1; 7391da177e4SLinus Torvalds wmb(); 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); 7421da177e4SLinus Torvalds if (retval) { 7431da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7441da177e4SLinus Torvalds err("Couldn't submit interrupt_out_urb %d", retval); 7451da177e4SLinus Torvalds goto unlock_exit; 7461da177e4SLinus Torvalds } 7471da177e4SLinus Torvalds retval = bytes_to_write; 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvalds unlock_exit: 7501da177e4SLinus Torvalds /* unlock the device */ 75118bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds exit: 754441b62c1SHarvey Harrison dbg(2, "%s: leave, return value %d", __func__, retval); 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds return retval; 7571da177e4SLinus Torvalds } 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds /** 7611da177e4SLinus Torvalds * tower_interrupt_in_callback 7621da177e4SLinus Torvalds */ 7637d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb) 7641da177e4SLinus Torvalds { 765cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 76664771a0fSGreg Kroah-Hartman int status = urb->status; 7671da177e4SLinus Torvalds int retval; 7681da177e4SLinus Torvalds 769441b62c1SHarvey Harrison dbg(4, "%s: enter, status %d", __func__, status); 7701da177e4SLinus Torvalds 771441b62c1SHarvey Harrison lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); 7721da177e4SLinus Torvalds 77364771a0fSGreg Kroah-Hartman if (status) { 77464771a0fSGreg Kroah-Hartman if (status == -ENOENT || 77564771a0fSGreg Kroah-Hartman status == -ECONNRESET || 77664771a0fSGreg Kroah-Hartman status == -ESHUTDOWN) { 7771da177e4SLinus Torvalds goto exit; 7781da177e4SLinus Torvalds } else { 779441b62c1SHarvey Harrison dbg(1, "%s: nonzero status received: %d", __func__, status); 7801da177e4SLinus Torvalds goto resubmit; /* maybe we can recover */ 7811da177e4SLinus Torvalds } 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds if (urb->actual_length > 0) { 7851da177e4SLinus Torvalds spin_lock (&dev->read_buffer_lock); 7861da177e4SLinus Torvalds if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { 7871da177e4SLinus Torvalds memcpy (dev->read_buffer + dev->read_buffer_length, 7881da177e4SLinus Torvalds dev->interrupt_in_buffer, 7891da177e4SLinus Torvalds urb->actual_length); 7901da177e4SLinus Torvalds dev->read_buffer_length += urb->actual_length; 7911da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 792441b62c1SHarvey Harrison dbg(3, "%s: received %d bytes", __func__, urb->actual_length); 7931da177e4SLinus Torvalds } else { 794441b62c1SHarvey Harrison printk(KERN_WARNING "%s: read_buffer overflow, %d bytes dropped", __func__, urb->actual_length); 7951da177e4SLinus Torvalds } 7961da177e4SLinus Torvalds spin_unlock (&dev->read_buffer_lock); 7971da177e4SLinus Torvalds } 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds resubmit: 8001da177e4SLinus Torvalds /* resubmit if we're still running */ 8011da177e4SLinus Torvalds if (dev->interrupt_in_running && dev->udev) { 8021da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); 8031da177e4SLinus Torvalds if (retval) { 804441b62c1SHarvey Harrison err("%s: usb_submit_urb failed (%d)", __func__, retval); 8051da177e4SLinus Torvalds } 8061da177e4SLinus Torvalds } 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds exit: 8091da177e4SLinus Torvalds dev->interrupt_in_done = 1; 8101da177e4SLinus Torvalds wake_up_interruptible (&dev->read_wait); 8111da177e4SLinus Torvalds 812441b62c1SHarvey Harrison lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); 813441b62c1SHarvey Harrison dbg(4, "%s: leave, status %d", __func__, status); 8141da177e4SLinus Torvalds } 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds /** 8181da177e4SLinus Torvalds * tower_interrupt_out_callback 8191da177e4SLinus Torvalds */ 8207d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb) 8211da177e4SLinus Torvalds { 822cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 82364771a0fSGreg Kroah-Hartman int status = urb->status; 8241da177e4SLinus Torvalds 825441b62c1SHarvey Harrison dbg(4, "%s: enter, status %d", __func__, status); 826441b62c1SHarvey Harrison lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /* sync/async unlink faults aren't errors */ 82964771a0fSGreg Kroah-Hartman if (status && !(status == -ENOENT || 83064771a0fSGreg Kroah-Hartman status == -ECONNRESET || 83164771a0fSGreg Kroah-Hartman status == -ESHUTDOWN)) { 8321da177e4SLinus Torvalds dbg(1, "%s - nonzero write bulk status received: %d", 833441b62c1SHarvey Harrison __func__, status); 8341da177e4SLinus Torvalds } 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 8371da177e4SLinus Torvalds wake_up_interruptible(&dev->write_wait); 8381da177e4SLinus Torvalds 839441b62c1SHarvey Harrison lego_usb_tower_debug_data(5, __func__, urb->actual_length, urb->transfer_buffer); 840441b62c1SHarvey Harrison dbg(4, "%s: leave, status %d", __func__, status); 8411da177e4SLinus Torvalds } 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds /** 8451da177e4SLinus Torvalds * tower_probe 8461da177e4SLinus Torvalds * 8471da177e4SLinus Torvalds * Called by the usb core when a new device is connected that it thinks 8481da177e4SLinus Torvalds * this driver might be interested in. 8491da177e4SLinus Torvalds */ 8501da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id) 8511da177e4SLinus Torvalds { 8521da177e4SLinus Torvalds struct usb_device *udev = interface_to_usbdev(interface); 8531da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 8541da177e4SLinus Torvalds struct usb_host_interface *iface_desc; 8551da177e4SLinus Torvalds struct usb_endpoint_descriptor* endpoint; 8561da177e4SLinus Torvalds struct tower_get_version_reply get_version_reply; 8571da177e4SLinus Torvalds int i; 8581da177e4SLinus Torvalds int retval = -ENOMEM; 8591da177e4SLinus Torvalds int result; 8601da177e4SLinus Torvalds 861441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 8621da177e4SLinus Torvalds 8631b29a375SGreg Kroah-Hartman if (udev == NULL) 8641b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "udev is NULL.\n"); 8651da177e4SLinus Torvalds 866093cf723SSteven Cole /* allocate memory for our device state and initialize it */ 8671da177e4SLinus Torvalds 8681da177e4SLinus Torvalds dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds if (dev == NULL) { 8711da177e4SLinus Torvalds err ("Out of memory"); 8721da177e4SLinus Torvalds goto exit; 8731da177e4SLinus Torvalds } 8741da177e4SLinus Torvalds 87518bcbcfeSDaniel Walker mutex_init(&dev->lock); 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds dev->udev = udev; 8781da177e4SLinus Torvalds dev->open_count = 0; 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds dev->read_buffer = NULL; 8811da177e4SLinus Torvalds dev->read_buffer_length = 0; 8821da177e4SLinus Torvalds dev->read_packet_length = 0; 8831da177e4SLinus Torvalds spin_lock_init (&dev->read_buffer_lock); 8841da177e4SLinus Torvalds dev->packet_timeout_jiffies = packet_timeout * HZ / 1000; 8851da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds init_waitqueue_head (&dev->read_wait); 8881da177e4SLinus Torvalds init_waitqueue_head (&dev->write_wait); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds dev->interrupt_in_buffer = NULL; 8911da177e4SLinus Torvalds dev->interrupt_in_endpoint = NULL; 8921da177e4SLinus Torvalds dev->interrupt_in_urb = NULL; 8931da177e4SLinus Torvalds dev->interrupt_in_running = 0; 8941da177e4SLinus Torvalds dev->interrupt_in_done = 0; 8951da177e4SLinus Torvalds 8961da177e4SLinus Torvalds dev->interrupt_out_buffer = NULL; 8971da177e4SLinus Torvalds dev->interrupt_out_endpoint = NULL; 8981da177e4SLinus Torvalds dev->interrupt_out_urb = NULL; 8991da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 9001da177e4SLinus Torvalds 9011da177e4SLinus Torvalds iface_desc = interface->cur_altsetting; 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds /* set up the endpoint information */ 9041da177e4SLinus Torvalds for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 9051da177e4SLinus Torvalds endpoint = &iface_desc->endpoint[i].desc; 9061da177e4SLinus Torvalds 907240661c5SLuiz Fernando N. Capitulino if (usb_endpoint_xfer_int(endpoint)) { 908240661c5SLuiz Fernando N. Capitulino if (usb_endpoint_dir_in(endpoint)) 9091da177e4SLinus Torvalds dev->interrupt_in_endpoint = endpoint; 910240661c5SLuiz Fernando N. Capitulino else 9111da177e4SLinus Torvalds dev->interrupt_out_endpoint = endpoint; 9121da177e4SLinus Torvalds } 9131da177e4SLinus Torvalds } 9141da177e4SLinus Torvalds if(dev->interrupt_in_endpoint == NULL) { 9151da177e4SLinus Torvalds err("interrupt in endpoint not found"); 9161da177e4SLinus Torvalds goto error; 9171da177e4SLinus Torvalds } 9181da177e4SLinus Torvalds if (dev->interrupt_out_endpoint == NULL) { 9191da177e4SLinus Torvalds err("interrupt out endpoint not found"); 9201da177e4SLinus Torvalds goto error; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); 9241da177e4SLinus Torvalds if (!dev->read_buffer) { 9251da177e4SLinus Torvalds err("Couldn't allocate read_buffer"); 9261da177e4SLinus Torvalds goto error; 9271da177e4SLinus Torvalds } 9281da177e4SLinus Torvalds dev->interrupt_in_buffer = kmalloc (le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize), GFP_KERNEL); 9291da177e4SLinus Torvalds if (!dev->interrupt_in_buffer) { 9301da177e4SLinus Torvalds err("Couldn't allocate interrupt_in_buffer"); 9311da177e4SLinus Torvalds goto error; 9321da177e4SLinus Torvalds } 9331da177e4SLinus Torvalds dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 9341da177e4SLinus Torvalds if (!dev->interrupt_in_urb) { 9351da177e4SLinus Torvalds err("Couldn't allocate interrupt_in_urb"); 9361da177e4SLinus Torvalds goto error; 9371da177e4SLinus Torvalds } 9381da177e4SLinus Torvalds dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); 9391da177e4SLinus Torvalds if (!dev->interrupt_out_buffer) { 9401da177e4SLinus Torvalds err("Couldn't allocate interrupt_out_buffer"); 9411da177e4SLinus Torvalds goto error; 9421da177e4SLinus Torvalds } 9431da177e4SLinus Torvalds dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 9441da177e4SLinus Torvalds if (!dev->interrupt_out_urb) { 9451da177e4SLinus Torvalds err("Couldn't allocate interrupt_out_urb"); 9461da177e4SLinus Torvalds goto error; 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 9491da177e4SLinus Torvalds dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds /* we can register the device now, as it is ready */ 9521da177e4SLinus Torvalds usb_set_intfdata (interface, dev); 9531da177e4SLinus Torvalds 9541da177e4SLinus Torvalds retval = usb_register_dev (interface, &tower_class); 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds if (retval) { 9571da177e4SLinus Torvalds /* something prevented us from registering this driver */ 9581da177e4SLinus Torvalds err ("Not able to get a minor for this device."); 9591da177e4SLinus Torvalds usb_set_intfdata (interface, NULL); 9601da177e4SLinus Torvalds goto error; 9611da177e4SLinus Torvalds } 9621da177e4SLinus Torvalds dev->minor = interface->minor; 9631da177e4SLinus Torvalds 9641da177e4SLinus Torvalds /* let the user know what node this device is now attached to */ 9651b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " 9661b29a375SGreg Kroah-Hartman "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), 9671b29a375SGreg Kroah-Hartman USB_MAJOR, dev->minor); 9681da177e4SLinus Torvalds 9691da177e4SLinus Torvalds /* get the firmware version and log it */ 9701da177e4SLinus Torvalds result = usb_control_msg (udev, 9711da177e4SLinus Torvalds usb_rcvctrlpipe(udev, 0), 9721da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_GET_VERSION, 9731da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 9741da177e4SLinus Torvalds 0, 9751da177e4SLinus Torvalds 0, 9761da177e4SLinus Torvalds &get_version_reply, 9771da177e4SLinus Torvalds sizeof(get_version_reply), 9781da177e4SLinus Torvalds 1000); 9791da177e4SLinus Torvalds if (result < 0) { 9801da177e4SLinus Torvalds err("LEGO USB Tower get version control request failed"); 9811da177e4SLinus Torvalds retval = result; 9821da177e4SLinus Torvalds goto error; 9831da177e4SLinus Torvalds } 9841b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower firmware version is %d.%d " 9851b29a375SGreg Kroah-Hartman "build %d\n", get_version_reply.major, 9861da177e4SLinus Torvalds get_version_reply.minor, 9871da177e4SLinus Torvalds le16_to_cpu(get_version_reply.build_no)); 9881da177e4SLinus Torvalds 9891da177e4SLinus Torvalds 9901da177e4SLinus Torvalds exit: 991441b62c1SHarvey Harrison dbg(2, "%s: leave, return value 0x%.8lx (dev)", __func__, (long) dev); 9921da177e4SLinus Torvalds 9931da177e4SLinus Torvalds return retval; 9941da177e4SLinus Torvalds 9951da177e4SLinus Torvalds error: 9961da177e4SLinus Torvalds tower_delete(dev); 9971da177e4SLinus Torvalds return retval; 9981da177e4SLinus Torvalds } 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds /** 10021da177e4SLinus Torvalds * tower_disconnect 10031da177e4SLinus Torvalds * 10041da177e4SLinus Torvalds * Called by the usb core when the device is removed from the system. 10051da177e4SLinus Torvalds */ 10061da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface) 10071da177e4SLinus Torvalds { 10081da177e4SLinus Torvalds struct lego_usb_tower *dev; 10091da177e4SLinus Torvalds int minor; 10101da177e4SLinus Torvalds 1011441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 10121da177e4SLinus Torvalds 10131da177e4SLinus Torvalds dev = usb_get_intfdata (interface); 101478663eccSOliver Neukum mutex_lock(&open_disc_mutex); 10151da177e4SLinus Torvalds usb_set_intfdata (interface, NULL); 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds minor = dev->minor; 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds /* give back our minor */ 10201da177e4SLinus Torvalds usb_deregister_dev (interface, &tower_class); 10211da177e4SLinus Torvalds 102218bcbcfeSDaniel Walker mutex_lock(&dev->lock); 102378663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 1024d4ead16fSAlan Stern 10251da177e4SLinus Torvalds /* if the device is not opened, then we clean up right now */ 10261da177e4SLinus Torvalds if (!dev->open_count) { 102718bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 10281da177e4SLinus Torvalds tower_delete (dev); 10291da177e4SLinus Torvalds } else { 10301da177e4SLinus Torvalds dev->udev = NULL; 1031d35b4ce1SOliver Neukum /* wake up pollers */ 1032d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->read_wait); 1033d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->write_wait); 103418bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n", 10381b29a375SGreg Kroah-Hartman (minor - LEGO_USB_TOWER_MINOR_BASE)); 10391da177e4SLinus Torvalds 1040441b62c1SHarvey Harrison dbg(2, "%s: leave", __func__); 10411da177e4SLinus Torvalds } 10421da177e4SLinus Torvalds 10431da177e4SLinus Torvalds 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /** 10461da177e4SLinus Torvalds * lego_usb_tower_init 10471da177e4SLinus Torvalds */ 10481da177e4SLinus Torvalds static int __init lego_usb_tower_init(void) 10491da177e4SLinus Torvalds { 10501da177e4SLinus Torvalds int result; 10511da177e4SLinus Torvalds int retval = 0; 10521da177e4SLinus Torvalds 1053441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 10541da177e4SLinus Torvalds 10551da177e4SLinus Torvalds /* register this driver with the USB subsystem */ 10561da177e4SLinus Torvalds result = usb_register(&tower_driver); 10571da177e4SLinus Torvalds if (result < 0) { 10581da177e4SLinus Torvalds err("usb_register failed for the "__FILE__" driver. Error number %d", result); 10591da177e4SLinus Torvalds retval = -1; 10601da177e4SLinus Torvalds goto exit; 10611da177e4SLinus Torvalds } 10621da177e4SLinus Torvalds 10631b29a375SGreg Kroah-Hartman printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" 10641b29a375SGreg Kroah-Hartman DRIVER_DESC "\n"); 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds exit: 1067441b62c1SHarvey Harrison dbg(2, "%s: leave, return value %d", __func__, retval); 10681da177e4SLinus Torvalds 10691da177e4SLinus Torvalds return retval; 10701da177e4SLinus Torvalds } 10711da177e4SLinus Torvalds 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds /** 10741da177e4SLinus Torvalds * lego_usb_tower_exit 10751da177e4SLinus Torvalds */ 10761da177e4SLinus Torvalds static void __exit lego_usb_tower_exit(void) 10771da177e4SLinus Torvalds { 1078441b62c1SHarvey Harrison dbg(2, "%s: enter", __func__); 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds /* deregister this driver with the USB subsystem */ 10811da177e4SLinus Torvalds usb_deregister (&tower_driver); 10821da177e4SLinus Torvalds 1083441b62c1SHarvey Harrison dbg(2, "%s: leave", __func__); 10841da177e4SLinus Torvalds } 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds module_init (lego_usb_tower_init); 10871da177e4SLinus Torvalds module_exit (lego_usb_tower_exit); 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds MODULE_AUTHOR(DRIVER_AUTHOR); 10901da177e4SLinus Torvalds MODULE_DESCRIPTION(DRIVER_DESC); 10911da177e4SLinus Torvalds #ifdef MODULE_LICENSE 10921da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 10931da177e4SLinus Torvalds #endif 1094