15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * LEGO USB Tower driver 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 2003 David Glance <davidgsf@sourceforge.net> 61da177e4SLinus Torvalds * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * derived from USB Skeleton driver - 0.5 91da177e4SLinus Torvalds * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * History: 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * 2001-10-13 - 0.1 js 141da177e4SLinus Torvalds * - first version 151da177e4SLinus Torvalds * 2001-11-03 - 0.2 js 161da177e4SLinus Torvalds * - simplified buffering, one-shot URBs for writing 171da177e4SLinus Torvalds * 2001-11-10 - 0.3 js 181da177e4SLinus Torvalds * - removed IOCTL (setting power/mode is more complicated, postponed) 191da177e4SLinus Torvalds * 2001-11-28 - 0.4 js 201da177e4SLinus Torvalds * - added vendor commands for mode of operation and power level in open 211da177e4SLinus Torvalds * 2001-12-04 - 0.5 js 221da177e4SLinus Torvalds * - set IR mode by default (by oversight 0.4 set VLL mode) 231da177e4SLinus Torvalds * 2002-01-11 - 0.5? pcchan 241da177e4SLinus Torvalds * - make read buffer reusable and work around bytes_to_write issue between 251da177e4SLinus Torvalds * uhci and legusbtower 261da177e4SLinus Torvalds * 2002-09-23 - 0.52 david (david@csse.uwa.edu.au) 271da177e4SLinus Torvalds * - imported into lejos project 281da177e4SLinus Torvalds * - changed wake_up to wake_up_interruptible 291da177e4SLinus Torvalds * - changed to use lego0 rather than tower0 30441b62c1SHarvey Harrison * - changed dbg() to use __func__ rather than deprecated __func__ 311da177e4SLinus Torvalds * 2003-01-12 - 0.53 david (david@csse.uwa.edu.au) 321da177e4SLinus Torvalds * - changed read and write to write everything or 331da177e4SLinus Torvalds * timeout (from a patch by Chris Riesen and Brett Thaeler driver) 341da177e4SLinus Torvalds * - added ioctl functionality to set timeouts 351da177e4SLinus Torvalds * 2003-07-18 - 0.54 davidgsf (david@csse.uwa.edu.au) 361da177e4SLinus Torvalds * - initial import into LegoUSB project 371da177e4SLinus Torvalds * - merge of existing LegoUSB.c driver 381da177e4SLinus Torvalds * 2003-07-18 - 0.56 davidgsf (david@csse.uwa.edu.au) 391da177e4SLinus Torvalds * - port to 2.6 style driver 401da177e4SLinus Torvalds * 2004-02-29 - 0.6 Juergen Stuber <starblue@users.sourceforge.net> 411da177e4SLinus Torvalds * - fix locking 421da177e4SLinus Torvalds * - unlink read URBs which are no longer needed 431da177e4SLinus Torvalds * - allow increased buffer size, eliminates need for timeout on write 441da177e4SLinus Torvalds * - have read URB running continuously 451da177e4SLinus Torvalds * - added poll 461da177e4SLinus Torvalds * - forbid seeking 471da177e4SLinus Torvalds * - added nonblocking I/O 48441b62c1SHarvey Harrison * - changed back __func__ to __func__ 491da177e4SLinus Torvalds * - read and log tower firmware version 501da177e4SLinus Torvalds * - reset tower on probe, avoids failure of first write 511da177e4SLinus Torvalds * 2004-03-09 - 0.7 Juergen Stuber <starblue@users.sourceforge.net> 521da177e4SLinus Torvalds * - timeout read now only after inactivity, shorten default accordingly 531da177e4SLinus Torvalds * 2004-03-11 - 0.8 Juergen Stuber <starblue@users.sourceforge.net> 541da177e4SLinus Torvalds * - log major, minor instead of possibly confusing device filename 551da177e4SLinus Torvalds * - whitespace cleanup 561da177e4SLinus Torvalds * 2004-03-12 - 0.9 Juergen Stuber <starblue@users.sourceforge.net> 571da177e4SLinus Torvalds * - normalize whitespace in debug messages 581da177e4SLinus Torvalds * - take care about endianness in control message responses 591da177e4SLinus Torvalds * 2004-03-13 - 0.91 Juergen Stuber <starblue@users.sourceforge.net> 601da177e4SLinus Torvalds * - make default intervals longer to accommodate current EHCI driver 611da177e4SLinus Torvalds * 2004-03-19 - 0.92 Juergen Stuber <starblue@users.sourceforge.net> 621da177e4SLinus Torvalds * - replaced atomic_t by memory barriers 631da177e4SLinus Torvalds * 2004-04-21 - 0.93 Juergen Stuber <starblue@users.sourceforge.net> 641da177e4SLinus Torvalds * - wait for completion of write urb in release (needed for remotecontrol) 651da177e4SLinus Torvalds * - corrected poll for write direction (missing negation) 661da177e4SLinus Torvalds * 2004-04-22 - 0.94 Juergen Stuber <starblue@users.sourceforge.net> 671da177e4SLinus Torvalds * - make device locking interruptible 681da177e4SLinus Torvalds * 2004-04-30 - 0.95 Juergen Stuber <starblue@users.sourceforge.net> 691da177e4SLinus Torvalds * - check for valid udev on resubmitting and unlinking urbs 701da177e4SLinus Torvalds * 2004-08-03 - 0.96 Juergen Stuber <starblue@users.sourceforge.net> 711da177e4SLinus Torvalds * - move reset into open to clean out spurious data 721da177e4SLinus Torvalds */ 731da177e4SLinus Torvalds 7438726bf5SGreg Kroah-Hartman #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7538726bf5SGreg Kroah-Hartman 761da177e4SLinus Torvalds #include <linux/kernel.h> 771da177e4SLinus Torvalds #include <linux/errno.h> 781da177e4SLinus Torvalds #include <linux/slab.h> 791da177e4SLinus Torvalds #include <linux/module.h> 801da177e4SLinus Torvalds #include <linux/completion.h> 814186ecf8SArjan van de Ven #include <linux/mutex.h> 827c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 831da177e4SLinus Torvalds #include <linux/usb.h> 841da177e4SLinus Torvalds #include <linux/poll.h> 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds #define DRIVER_AUTHOR "Juergen Stuber <starblue@sourceforge.net>" 881da177e4SLinus Torvalds #define DRIVER_DESC "LEGO USB Tower Driver" 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds /* The defaults are chosen to work with the latest versions of leJOS and NQC. 921da177e4SLinus Torvalds */ 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* Some legacy software likes to receive packets in one piece. 951da177e4SLinus Torvalds * In this case read_buffer_size should exceed the maximal packet length 961da177e4SLinus Torvalds * (417 for datalog uploads), and packet_timeout should be set. 971da177e4SLinus Torvalds */ 981da177e4SLinus Torvalds static int read_buffer_size = 480; 991da177e4SLinus Torvalds module_param(read_buffer_size, int, 0); 1001da177e4SLinus Torvalds MODULE_PARM_DESC(read_buffer_size, "Read buffer size"); 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* Some legacy software likes to send packets in one piece. 1031da177e4SLinus Torvalds * In this case write_buffer_size should exceed the maximal packet length 1041da177e4SLinus Torvalds * (417 for firmware and program downloads). 1051da177e4SLinus Torvalds * A problem with long writes is that the following read may time out 1061da177e4SLinus Torvalds * if the software is not prepared to wait long enough. 1071da177e4SLinus Torvalds */ 1081da177e4SLinus Torvalds static int write_buffer_size = 480; 1091da177e4SLinus Torvalds module_param(write_buffer_size, int, 0); 1101da177e4SLinus Torvalds MODULE_PARM_DESC(write_buffer_size, "Write buffer size"); 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds /* Some legacy software expects reads to contain whole LASM packets. 1131da177e4SLinus Torvalds * To achieve this, characters which arrive before a packet timeout 1141da177e4SLinus Torvalds * occurs will be returned in a single read operation. 1151da177e4SLinus Torvalds * A problem with long reads is that the software may time out 1161da177e4SLinus Torvalds * if it is not prepared to wait long enough. 1171da177e4SLinus Torvalds * The packet timeout should be greater than the time between the 1181da177e4SLinus Torvalds * reception of subsequent characters, which should arrive about 1191da177e4SLinus Torvalds * every 5ms for the standard 2400 baud. 1201da177e4SLinus Torvalds * Set it to 0 to disable. 1211da177e4SLinus Torvalds */ 1221da177e4SLinus Torvalds static int packet_timeout = 50; 1231da177e4SLinus Torvalds module_param(packet_timeout, int, 0); 1241da177e4SLinus Torvalds MODULE_PARM_DESC(packet_timeout, "Packet timeout in ms"); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* Some legacy software expects blocking reads to time out. 1271da177e4SLinus Torvalds * Timeout occurs after the specified time of read and write inactivity. 1281da177e4SLinus Torvalds * Set it to 0 to disable. 1291da177e4SLinus Torvalds */ 1301da177e4SLinus Torvalds static int read_timeout = 200; 1311da177e4SLinus Torvalds module_param(read_timeout, int, 0); 1321da177e4SLinus Torvalds MODULE_PARM_DESC(read_timeout, "Read timeout in ms"); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* As of kernel version 2.6.4 ehci-hcd uses an 1351da177e4SLinus Torvalds * "only one interrupt transfer per frame" shortcut 1361da177e4SLinus Torvalds * to simplify the scheduling of periodic transfers. 1371da177e4SLinus Torvalds * This conflicts with our standard 1ms intervals for in and out URBs. 1381da177e4SLinus Torvalds * We use default intervals of 2ms for in and 8ms for out transfers, 1391da177e4SLinus Torvalds * which is fast enough for 2400 baud and allows a small additional load. 1401da177e4SLinus Torvalds * Increase the interval to allow more devices that do interrupt transfers, 1411da177e4SLinus Torvalds * or set to 0 to use the standard interval from the endpoint descriptors. 1421da177e4SLinus Torvalds */ 1431da177e4SLinus Torvalds static int interrupt_in_interval = 2; 1441da177e4SLinus Torvalds module_param(interrupt_in_interval, int, 0); 1451da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_in_interval, "Interrupt in interval in ms"); 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds static int interrupt_out_interval = 8; 1481da177e4SLinus Torvalds module_param(interrupt_out_interval, int, 0); 1491da177e4SLinus Torvalds MODULE_PARM_DESC(interrupt_out_interval, "Interrupt out interval in ms"); 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds /* Define these values to match your device */ 1521da177e4SLinus Torvalds #define LEGO_USB_TOWER_VENDOR_ID 0x0694 1531da177e4SLinus Torvalds #define LEGO_USB_TOWER_PRODUCT_ID 0x0001 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* Vendor requests */ 1561da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_RESET 0x04 1571da177e4SLinus Torvalds #define LEGO_USB_TOWER_REQUEST_GET_VERSION 0xFD 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds struct tower_reset_reply { 1601da177e4SLinus Torvalds __le16 size; /* little-endian */ 1611da177e4SLinus Torvalds __u8 err_code; 1621da177e4SLinus Torvalds __u8 spare; 1631da177e4SLinus Torvalds } __attribute__ ((packed)); 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds struct tower_get_version_reply { 1661da177e4SLinus Torvalds __le16 size; /* little-endian */ 1671da177e4SLinus Torvalds __u8 err_code; 1681da177e4SLinus Torvalds __u8 spare; 1691da177e4SLinus Torvalds __u8 major; 1701da177e4SLinus Torvalds __u8 minor; 1711da177e4SLinus Torvalds __le16 build_no; /* little-endian */ 1721da177e4SLinus Torvalds } __attribute__ ((packed)); 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvalds /* table of devices that work with this driver */ 17633b9e162SNémeth Márton static const struct usb_device_id tower_table[] = { 1771da177e4SLinus Torvalds { USB_DEVICE(LEGO_USB_TOWER_VENDOR_ID, LEGO_USB_TOWER_PRODUCT_ID) }, 1781da177e4SLinus Torvalds { } /* Terminating entry */ 1791da177e4SLinus Torvalds }; 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds MODULE_DEVICE_TABLE (usb, tower_table); 18278663eccSOliver Neukum static DEFINE_MUTEX(open_disc_mutex); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds #define LEGO_USB_TOWER_MINOR_BASE 160 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds /* Structure to hold all of our device specific stuff */ 1881da177e4SLinus Torvalds struct lego_usb_tower { 18918bcbcfeSDaniel Walker struct mutex lock; /* locks this structure */ 1901da177e4SLinus Torvalds struct usb_device* udev; /* save off the usb device pointer */ 1911da177e4SLinus Torvalds unsigned char minor; /* the starting minor number for this device */ 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvalds int open_count; /* number of times this port has been opened */ 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds char* read_buffer; 1961da177e4SLinus Torvalds size_t read_buffer_length; /* this much came in */ 1971da177e4SLinus Torvalds size_t read_packet_length; /* this much will be returned on read */ 1981da177e4SLinus Torvalds spinlock_t read_buffer_lock; 1991da177e4SLinus Torvalds int packet_timeout_jiffies; 2001da177e4SLinus Torvalds unsigned long read_last_arrival; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds wait_queue_head_t read_wait; 2031da177e4SLinus Torvalds wait_queue_head_t write_wait; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds char* interrupt_in_buffer; 2061da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_in_endpoint; 2071da177e4SLinus Torvalds struct urb* interrupt_in_urb; 2081da177e4SLinus Torvalds int interrupt_in_interval; 2091da177e4SLinus Torvalds int interrupt_in_running; 2101da177e4SLinus Torvalds int interrupt_in_done; 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds char* interrupt_out_buffer; 2131da177e4SLinus Torvalds struct usb_endpoint_descriptor* interrupt_out_endpoint; 2141da177e4SLinus Torvalds struct urb* interrupt_out_urb; 2151da177e4SLinus Torvalds int interrupt_out_interval; 2161da177e4SLinus Torvalds int interrupt_out_busy; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds }; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds /* local function prototypes */ 2221da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos); 2231da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos); 2241da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev); 2251da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file); 2261da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file); 227afc9a42bSAl Viro static __poll_t tower_poll (struct file *file, poll_table *wait); 2281da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence); 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev); 2311da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev); 2327d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb); 2337d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb); 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id); 2361da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface); 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds /* file operations needed when we register this driver */ 240066202ddSLuiz Fernando N. Capitulino static const struct file_operations tower_fops = { 2411da177e4SLinus Torvalds .owner = THIS_MODULE, 2421da177e4SLinus Torvalds .read = tower_read, 2431da177e4SLinus Torvalds .write = tower_write, 2441da177e4SLinus Torvalds .open = tower_open, 2451da177e4SLinus Torvalds .release = tower_release, 2461da177e4SLinus Torvalds .poll = tower_poll, 2471da177e4SLinus Torvalds .llseek = tower_llseek, 2481da177e4SLinus Torvalds }; 2491da177e4SLinus Torvalds 2502c9ede55SAl Viro static char *legousbtower_devnode(struct device *dev, umode_t *mode) 251f7a386c5SKay Sievers { 252f7a386c5SKay Sievers return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); 253f7a386c5SKay Sievers } 254f7a386c5SKay Sievers 2551da177e4SLinus Torvalds /* 2561da177e4SLinus Torvalds * usb class driver info in order to get a minor number from the usb core, 257d6e5bcf4SGreg Kroah-Hartman * and to have the device registered with the driver core 2581da177e4SLinus Torvalds */ 2591da177e4SLinus Torvalds static struct usb_class_driver tower_class = { 260d6e5bcf4SGreg Kroah-Hartman .name = "legousbtower%d", 261e454cea2SKay Sievers .devnode = legousbtower_devnode, 2621da177e4SLinus Torvalds .fops = &tower_fops, 2631da177e4SLinus Torvalds .minor_base = LEGO_USB_TOWER_MINOR_BASE, 2641da177e4SLinus Torvalds }; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds /* usb specific object needed to register this driver with the usb subsystem */ 2681da177e4SLinus Torvalds static struct usb_driver tower_driver = { 2691da177e4SLinus Torvalds .name = "legousbtower", 2701da177e4SLinus Torvalds .probe = tower_probe, 2711da177e4SLinus Torvalds .disconnect = tower_disconnect, 2721da177e4SLinus Torvalds .id_table = tower_table, 2731da177e4SLinus Torvalds }; 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds /** 2771da177e4SLinus Torvalds * lego_usb_tower_debug_data 2781da177e4SLinus Torvalds */ 2794dae9963SGreg Kroah-Hartman static inline void lego_usb_tower_debug_data(struct device *dev, 2804dae9963SGreg Kroah-Hartman const char *function, int size, 2814dae9963SGreg Kroah-Hartman const unsigned char *data) 2821da177e4SLinus Torvalds { 2834dae9963SGreg Kroah-Hartman dev_dbg(dev, "%s - length = %d, data = %*ph\n", 2844dae9963SGreg Kroah-Hartman function, size, size, data); 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /** 2891da177e4SLinus Torvalds * tower_delete 2901da177e4SLinus Torvalds */ 2911da177e4SLinus Torvalds static inline void tower_delete (struct lego_usb_tower *dev) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds tower_abort_transfers (dev); 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds /* free data structures */ 2961da177e4SLinus Torvalds usb_free_urb(dev->interrupt_in_urb); 2971da177e4SLinus Torvalds usb_free_urb(dev->interrupt_out_urb); 2981da177e4SLinus Torvalds kfree (dev->read_buffer); 2991da177e4SLinus Torvalds kfree (dev->interrupt_in_buffer); 3001da177e4SLinus Torvalds kfree (dev->interrupt_out_buffer); 3011da177e4SLinus Torvalds kfree (dev); 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /** 3061da177e4SLinus Torvalds * tower_open 3071da177e4SLinus Torvalds */ 3081da177e4SLinus Torvalds static int tower_open (struct inode *inode, struct file *file) 3091da177e4SLinus Torvalds { 3101da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 3111da177e4SLinus Torvalds int subminor; 3121da177e4SLinus Torvalds int retval = 0; 3131da177e4SLinus Torvalds struct usb_interface *interface; 314942a4873SMaksim Salau struct tower_reset_reply *reset_reply; 3151da177e4SLinus Torvalds int result; 3161da177e4SLinus Torvalds 317942a4873SMaksim Salau reset_reply = kmalloc(sizeof(*reset_reply), GFP_KERNEL); 318942a4873SMaksim Salau 319942a4873SMaksim Salau if (!reset_reply) { 320942a4873SMaksim Salau retval = -ENOMEM; 321942a4873SMaksim Salau goto exit; 322942a4873SMaksim Salau } 323942a4873SMaksim Salau 3241da177e4SLinus Torvalds nonseekable_open(inode, file); 3251da177e4SLinus Torvalds subminor = iminor(inode); 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds interface = usb_find_interface (&tower_driver, subminor); 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds if (!interface) { 33038726bf5SGreg Kroah-Hartman pr_err("error, can't find device for minor %d\n", subminor); 3311da177e4SLinus Torvalds retval = -ENODEV; 332d4ead16fSAlan Stern goto exit; 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds 33578663eccSOliver Neukum mutex_lock(&open_disc_mutex); 3361da177e4SLinus Torvalds dev = usb_get_intfdata(interface); 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds if (!dev) { 33978663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3401da177e4SLinus Torvalds retval = -ENODEV; 341d4ead16fSAlan Stern goto exit; 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* lock this device */ 34518bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 34678663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3471da177e4SLinus Torvalds retval = -ERESTARTSYS; 348d4ead16fSAlan Stern goto exit; 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 35178663eccSOliver Neukum 3521da177e4SLinus Torvalds /* allow opening only once */ 3531da177e4SLinus Torvalds if (dev->open_count) { 35478663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3551da177e4SLinus Torvalds retval = -EBUSY; 3561da177e4SLinus Torvalds goto unlock_exit; 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds dev->open_count = 1; 35978663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 3601da177e4SLinus Torvalds 3611da177e4SLinus Torvalds /* reset the tower */ 3621da177e4SLinus Torvalds result = usb_control_msg (dev->udev, 3631da177e4SLinus Torvalds usb_rcvctrlpipe(dev->udev, 0), 3641da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_RESET, 3651da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 3661da177e4SLinus Torvalds 0, 3671da177e4SLinus Torvalds 0, 368942a4873SMaksim Salau reset_reply, 369942a4873SMaksim Salau sizeof(*reset_reply), 3701da177e4SLinus Torvalds 1000); 3711da177e4SLinus Torvalds if (result < 0) { 3729d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3739d974b2aSGreg Kroah-Hartman "LEGO USB Tower reset control request failed\n"); 3741da177e4SLinus Torvalds retval = result; 3751da177e4SLinus Torvalds goto unlock_exit; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* initialize in direction */ 3791da177e4SLinus Torvalds dev->read_buffer_length = 0; 3801da177e4SLinus Torvalds dev->read_packet_length = 0; 3811da177e4SLinus Torvalds usb_fill_int_urb (dev->interrupt_in_urb, 3821da177e4SLinus Torvalds dev->udev, 3831da177e4SLinus Torvalds usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress), 3841da177e4SLinus Torvalds dev->interrupt_in_buffer, 38529cc8897SKuninori Morimoto usb_endpoint_maxp(dev->interrupt_in_endpoint), 3861da177e4SLinus Torvalds tower_interrupt_in_callback, 3871da177e4SLinus Torvalds dev, 3881da177e4SLinus Torvalds dev->interrupt_in_interval); 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds dev->interrupt_in_running = 1; 3911da177e4SLinus Torvalds dev->interrupt_in_done = 0; 3921da177e4SLinus Torvalds mb(); 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_KERNEL); 3951da177e4SLinus Torvalds if (retval) { 3969d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 3979d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_in_urb %d\n", retval); 3981da177e4SLinus Torvalds dev->interrupt_in_running = 0; 3991da177e4SLinus Torvalds dev->open_count = 0; 4001da177e4SLinus Torvalds goto unlock_exit; 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds 4031da177e4SLinus Torvalds /* save device in the file's private structure */ 4041da177e4SLinus Torvalds file->private_data = dev; 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds unlock_exit: 40718bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4081da177e4SLinus Torvalds 409d4ead16fSAlan Stern exit: 410942a4873SMaksim Salau kfree(reset_reply); 4111da177e4SLinus Torvalds return retval; 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds 4141da177e4SLinus Torvalds /** 4151da177e4SLinus Torvalds * tower_release 4161da177e4SLinus Torvalds */ 4171da177e4SLinus Torvalds static int tower_release (struct inode *inode, struct file *file) 4181da177e4SLinus Torvalds { 4191da177e4SLinus Torvalds struct lego_usb_tower *dev; 4201da177e4SLinus Torvalds int retval = 0; 4211da177e4SLinus Torvalds 4225bd6e8b3SJoe Perches dev = file->private_data; 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds if (dev == NULL) { 4251da177e4SLinus Torvalds retval = -ENODEV; 42678663eccSOliver Neukum goto exit_nolock; 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 42978663eccSOliver Neukum mutex_lock(&open_disc_mutex); 43018bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 4311da177e4SLinus Torvalds retval = -ERESTARTSYS; 4321da177e4SLinus Torvalds goto exit; 4331da177e4SLinus Torvalds } 4341da177e4SLinus Torvalds 4351da177e4SLinus Torvalds if (dev->open_count != 1) { 436fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: device not opened exactly once\n", 437fef526caSGreg Kroah-Hartman __func__); 4381da177e4SLinus Torvalds retval = -ENODEV; 4391da177e4SLinus Torvalds goto unlock_exit; 4401da177e4SLinus Torvalds } 4411da177e4SLinus Torvalds if (dev->udev == NULL) { 4421da177e4SLinus Torvalds /* the device was unplugged before the file was released */ 44318bcbcfeSDaniel Walker 44418bcbcfeSDaniel Walker /* unlock here as tower_delete frees dev */ 44518bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4461da177e4SLinus Torvalds tower_delete (dev); 4471da177e4SLinus Torvalds goto exit; 4481da177e4SLinus Torvalds } 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds /* wait until write transfer is finished */ 4511da177e4SLinus Torvalds if (dev->interrupt_out_busy) { 4521da177e4SLinus Torvalds wait_event_interruptible_timeout (dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds tower_abort_transfers (dev); 4551da177e4SLinus Torvalds dev->open_count = 0; 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds unlock_exit: 45818bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds exit: 46178663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 46278663eccSOliver Neukum exit_nolock: 4631da177e4SLinus Torvalds return retval; 4641da177e4SLinus Torvalds } 4651da177e4SLinus Torvalds 4661da177e4SLinus Torvalds 4671da177e4SLinus Torvalds /** 4681da177e4SLinus Torvalds * tower_abort_transfers 4691da177e4SLinus Torvalds * aborts transfers and frees associated data structures 4701da177e4SLinus Torvalds */ 4711da177e4SLinus Torvalds static void tower_abort_transfers (struct lego_usb_tower *dev) 4721da177e4SLinus Torvalds { 473fef526caSGreg Kroah-Hartman if (dev == NULL) 474d26f6e57SGreg Kroah-Hartman return; 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds /* shutdown transfer */ 4771da177e4SLinus Torvalds if (dev->interrupt_in_running) { 4781da177e4SLinus Torvalds dev->interrupt_in_running = 0; 4791da177e4SLinus Torvalds mb(); 480f53510e8SMariusz Kozlowski if (dev->udev) 4811da177e4SLinus Torvalds usb_kill_urb (dev->interrupt_in_urb); 4821da177e4SLinus Torvalds } 483f53510e8SMariusz Kozlowski if (dev->interrupt_out_busy && dev->udev) 4841da177e4SLinus Torvalds usb_kill_urb(dev->interrupt_out_urb); 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds 4881da177e4SLinus Torvalds /** 4891da177e4SLinus Torvalds * tower_check_for_read_packet 4901da177e4SLinus Torvalds * 4911da177e4SLinus Torvalds * To get correct semantics for signals and non-blocking I/O 4921da177e4SLinus Torvalds * with packetizing we pretend not to see any data in the read buffer 4931da177e4SLinus Torvalds * until it has been there unchanged for at least 4941da177e4SLinus Torvalds * dev->packet_timeout_jiffies, or until the buffer is full. 4951da177e4SLinus Torvalds */ 4961da177e4SLinus Torvalds static void tower_check_for_read_packet (struct lego_usb_tower *dev) 4971da177e4SLinus Torvalds { 4981da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 4991da177e4SLinus Torvalds if (!packet_timeout 5001da177e4SLinus Torvalds || time_after(jiffies, dev->read_last_arrival + dev->packet_timeout_jiffies) 5011da177e4SLinus Torvalds || dev->read_buffer_length == read_buffer_size) { 5021da177e4SLinus Torvalds dev->read_packet_length = dev->read_buffer_length; 5031da177e4SLinus Torvalds } 5041da177e4SLinus Torvalds dev->interrupt_in_done = 0; 5051da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 5061da177e4SLinus Torvalds } 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds /** 5101da177e4SLinus Torvalds * tower_poll 5111da177e4SLinus Torvalds */ 512afc9a42bSAl Viro static __poll_t tower_poll (struct file *file, poll_table *wait) 5131da177e4SLinus Torvalds { 5141da177e4SLinus Torvalds struct lego_usb_tower *dev; 515afc9a42bSAl Viro __poll_t mask = 0; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds dev = file->private_data; 5181da177e4SLinus Torvalds 519d35b4ce1SOliver Neukum if (!dev->udev) 520a9a08845SLinus Torvalds return EPOLLERR | EPOLLHUP; 521d35b4ce1SOliver Neukum 5221da177e4SLinus Torvalds poll_wait(file, &dev->read_wait, wait); 5231da177e4SLinus Torvalds poll_wait(file, &dev->write_wait, wait); 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds tower_check_for_read_packet(dev); 5261da177e4SLinus Torvalds if (dev->read_packet_length > 0) { 527a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds if (!dev->interrupt_out_busy) { 530a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 5311da177e4SLinus Torvalds } 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds return mask; 5341da177e4SLinus Torvalds } 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds 5371da177e4SLinus Torvalds /** 5381da177e4SLinus Torvalds * tower_llseek 5391da177e4SLinus Torvalds */ 5401da177e4SLinus Torvalds static loff_t tower_llseek (struct file *file, loff_t off, int whence) 5411da177e4SLinus Torvalds { 5421da177e4SLinus Torvalds return -ESPIPE; /* unseekable */ 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds /** 5471da177e4SLinus Torvalds * tower_read 5481da177e4SLinus Torvalds */ 5491da177e4SLinus Torvalds static ssize_t tower_read (struct file *file, char __user *buffer, size_t count, loff_t *ppos) 5501da177e4SLinus Torvalds { 5511da177e4SLinus Torvalds struct lego_usb_tower *dev; 5521da177e4SLinus Torvalds size_t bytes_to_read; 5531da177e4SLinus Torvalds int i; 5541da177e4SLinus Torvalds int retval = 0; 5551da177e4SLinus Torvalds unsigned long timeout = 0; 5561da177e4SLinus Torvalds 5575bd6e8b3SJoe Perches dev = file->private_data; 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds /* lock this object */ 56018bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 5611da177e4SLinus Torvalds retval = -ERESTARTSYS; 5621da177e4SLinus Torvalds goto exit; 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 5661da177e4SLinus Torvalds if (dev->udev == NULL) { 5671da177e4SLinus Torvalds retval = -ENODEV; 56838726bf5SGreg Kroah-Hartman pr_err("No device or device unplugged %d\n", retval); 5691da177e4SLinus Torvalds goto unlock_exit; 5701da177e4SLinus Torvalds } 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds /* verify that we actually have some data to read */ 5731da177e4SLinus Torvalds if (count == 0) { 574fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "read request of 0 bytes\n"); 5751da177e4SLinus Torvalds goto unlock_exit; 5761da177e4SLinus Torvalds } 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvalds if (read_timeout) { 5798f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds /* wait for data */ 5831da177e4SLinus Torvalds tower_check_for_read_packet (dev); 5841da177e4SLinus Torvalds while (dev->read_packet_length == 0) { 5851da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 5861da177e4SLinus Torvalds retval = -EAGAIN; 5871da177e4SLinus Torvalds goto unlock_exit; 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds retval = wait_event_interruptible_timeout(dev->read_wait, dev->interrupt_in_done, dev->packet_timeout_jiffies); 5901da177e4SLinus Torvalds if (retval < 0) { 5911da177e4SLinus Torvalds goto unlock_exit; 5921da177e4SLinus Torvalds } 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds /* reset read timeout during read or write activity */ 5951da177e4SLinus Torvalds if (read_timeout 5961da177e4SLinus Torvalds && (dev->read_buffer_length || dev->interrupt_out_busy)) { 5978f7e9473SNicholas Mc Guire timeout = jiffies + msecs_to_jiffies(read_timeout); 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds /* check for read timeout */ 6001da177e4SLinus Torvalds if (read_timeout && time_after (jiffies, timeout)) { 6011da177e4SLinus Torvalds retval = -ETIMEDOUT; 6021da177e4SLinus Torvalds goto unlock_exit; 6031da177e4SLinus Torvalds } 6041da177e4SLinus Torvalds tower_check_for_read_packet (dev); 6051da177e4SLinus Torvalds } 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds /* copy the data from read_buffer into userspace */ 6081da177e4SLinus Torvalds bytes_to_read = min(count, dev->read_packet_length); 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds if (copy_to_user (buffer, dev->read_buffer, bytes_to_read)) { 6111da177e4SLinus Torvalds retval = -EFAULT; 6121da177e4SLinus Torvalds goto unlock_exit; 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds spin_lock_irq (&dev->read_buffer_lock); 6161da177e4SLinus Torvalds dev->read_buffer_length -= bytes_to_read; 6171da177e4SLinus Torvalds dev->read_packet_length -= bytes_to_read; 6181da177e4SLinus Torvalds for (i=0; i<dev->read_buffer_length; i++) { 6191da177e4SLinus Torvalds dev->read_buffer[i] = dev->read_buffer[i+bytes_to_read]; 6201da177e4SLinus Torvalds } 6211da177e4SLinus Torvalds spin_unlock_irq (&dev->read_buffer_lock); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds retval = bytes_to_read; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds unlock_exit: 6261da177e4SLinus Torvalds /* unlock the device */ 62718bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds exit: 6301da177e4SLinus Torvalds return retval; 6311da177e4SLinus Torvalds } 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds 6341da177e4SLinus Torvalds /** 6351da177e4SLinus Torvalds * tower_write 6361da177e4SLinus Torvalds */ 6371da177e4SLinus Torvalds static ssize_t tower_write (struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 6381da177e4SLinus Torvalds { 6391da177e4SLinus Torvalds struct lego_usb_tower *dev; 6401da177e4SLinus Torvalds size_t bytes_to_write; 6411da177e4SLinus Torvalds int retval = 0; 6421da177e4SLinus Torvalds 6435bd6e8b3SJoe Perches dev = file->private_data; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* lock this object */ 64618bcbcfeSDaniel Walker if (mutex_lock_interruptible(&dev->lock)) { 6471da177e4SLinus Torvalds retval = -ERESTARTSYS; 6481da177e4SLinus Torvalds goto exit; 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds /* verify that the device wasn't unplugged */ 6521da177e4SLinus Torvalds if (dev->udev == NULL) { 6531da177e4SLinus Torvalds retval = -ENODEV; 65438726bf5SGreg Kroah-Hartman pr_err("No device or device unplugged %d\n", retval); 6551da177e4SLinus Torvalds goto unlock_exit; 6561da177e4SLinus Torvalds } 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds /* verify that we actually have some data to write */ 6591da177e4SLinus Torvalds if (count == 0) { 660fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "write request of 0 bytes\n"); 6611da177e4SLinus Torvalds goto unlock_exit; 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds /* wait until previous transfer is finished */ 6651da177e4SLinus Torvalds while (dev->interrupt_out_busy) { 6661da177e4SLinus Torvalds if (file->f_flags & O_NONBLOCK) { 6671da177e4SLinus Torvalds retval = -EAGAIN; 6681da177e4SLinus Torvalds goto unlock_exit; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds retval = wait_event_interruptible (dev->write_wait, !dev->interrupt_out_busy); 6711da177e4SLinus Torvalds if (retval) { 6721da177e4SLinus Torvalds goto unlock_exit; 6731da177e4SLinus Torvalds } 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds /* write the data into interrupt_out_buffer from userspace */ 6771da177e4SLinus Torvalds bytes_to_write = min_t(int, count, write_buffer_size); 6785b5e0928SAlexey Dobriyan dev_dbg(&dev->udev->dev, "%s: count = %zd, bytes_to_write = %zd\n", 679fef526caSGreg Kroah-Hartman __func__, count, bytes_to_write); 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds if (copy_from_user (dev->interrupt_out_buffer, buffer, bytes_to_write)) { 6821da177e4SLinus Torvalds retval = -EFAULT; 6831da177e4SLinus Torvalds goto unlock_exit; 6841da177e4SLinus Torvalds } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds /* send off the urb */ 6871da177e4SLinus Torvalds usb_fill_int_urb(dev->interrupt_out_urb, 6881da177e4SLinus Torvalds dev->udev, 6891da177e4SLinus Torvalds usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress), 6901da177e4SLinus Torvalds dev->interrupt_out_buffer, 6911da177e4SLinus Torvalds bytes_to_write, 6921da177e4SLinus Torvalds tower_interrupt_out_callback, 6931da177e4SLinus Torvalds dev, 6941da177e4SLinus Torvalds dev->interrupt_out_interval); 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds dev->interrupt_out_busy = 1; 6971da177e4SLinus Torvalds wmb(); 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_out_urb, GFP_KERNEL); 7001da177e4SLinus Torvalds if (retval) { 7011da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7029d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 7039d974b2aSGreg Kroah-Hartman "Couldn't submit interrupt_out_urb %d\n", retval); 7041da177e4SLinus Torvalds goto unlock_exit; 7051da177e4SLinus Torvalds } 7061da177e4SLinus Torvalds retval = bytes_to_write; 7071da177e4SLinus Torvalds 7081da177e4SLinus Torvalds unlock_exit: 7091da177e4SLinus Torvalds /* unlock the device */ 71018bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds exit: 7131da177e4SLinus Torvalds return retval; 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds 7171da177e4SLinus Torvalds /** 7181da177e4SLinus Torvalds * tower_interrupt_in_callback 7191da177e4SLinus Torvalds */ 7207d12e780SDavid Howells static void tower_interrupt_in_callback (struct urb *urb) 7211da177e4SLinus Torvalds { 722cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 72364771a0fSGreg Kroah-Hartman int status = urb->status; 7241da177e4SLinus Torvalds int retval; 7254327059aSSebastian Andrzej Siewior unsigned long flags; 7261da177e4SLinus Torvalds 7274dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7284dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7291da177e4SLinus Torvalds 73064771a0fSGreg Kroah-Hartman if (status) { 73164771a0fSGreg Kroah-Hartman if (status == -ENOENT || 73264771a0fSGreg Kroah-Hartman status == -ECONNRESET || 73364771a0fSGreg Kroah-Hartman status == -ESHUTDOWN) { 7341da177e4SLinus Torvalds goto exit; 7351da177e4SLinus Torvalds } else { 736fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 737fef526caSGreg Kroah-Hartman "%s: nonzero status received: %d\n", __func__, 738fef526caSGreg Kroah-Hartman status); 7391da177e4SLinus Torvalds goto resubmit; /* maybe we can recover */ 7401da177e4SLinus Torvalds } 7411da177e4SLinus Torvalds } 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds if (urb->actual_length > 0) { 7444327059aSSebastian Andrzej Siewior spin_lock_irqsave(&dev->read_buffer_lock, flags); 7451da177e4SLinus Torvalds if (dev->read_buffer_length + urb->actual_length < read_buffer_size) { 7461da177e4SLinus Torvalds memcpy (dev->read_buffer + dev->read_buffer_length, 7471da177e4SLinus Torvalds dev->interrupt_in_buffer, 7481da177e4SLinus Torvalds urb->actual_length); 7491da177e4SLinus Torvalds dev->read_buffer_length += urb->actual_length; 7501da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 751fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, "%s: received %d bytes\n", 752fef526caSGreg Kroah-Hartman __func__, urb->actual_length); 7531da177e4SLinus Torvalds } else { 75438726bf5SGreg Kroah-Hartman pr_warn("read_buffer overflow, %d bytes dropped\n", 75538726bf5SGreg Kroah-Hartman urb->actual_length); 7561da177e4SLinus Torvalds } 7574327059aSSebastian Andrzej Siewior spin_unlock_irqrestore(&dev->read_buffer_lock, flags); 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds resubmit: 7611da177e4SLinus Torvalds /* resubmit if we're still running */ 7621da177e4SLinus Torvalds if (dev->interrupt_in_running && dev->udev) { 7631da177e4SLinus Torvalds retval = usb_submit_urb (dev->interrupt_in_urb, GFP_ATOMIC); 7649d974b2aSGreg Kroah-Hartman if (retval) 7659d974b2aSGreg Kroah-Hartman dev_err(&dev->udev->dev, 7669d974b2aSGreg Kroah-Hartman "%s: usb_submit_urb failed (%d)\n", 7679d974b2aSGreg Kroah-Hartman __func__, retval); 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds exit: 7711da177e4SLinus Torvalds dev->interrupt_in_done = 1; 7721da177e4SLinus Torvalds wake_up_interruptible (&dev->read_wait); 7731da177e4SLinus Torvalds } 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvalds /** 7771da177e4SLinus Torvalds * tower_interrupt_out_callback 7781da177e4SLinus Torvalds */ 7797d12e780SDavid Howells static void tower_interrupt_out_callback (struct urb *urb) 7801da177e4SLinus Torvalds { 781cdc97792SMing Lei struct lego_usb_tower *dev = urb->context; 78264771a0fSGreg Kroah-Hartman int status = urb->status; 7831da177e4SLinus Torvalds 7844dae9963SGreg Kroah-Hartman lego_usb_tower_debug_data(&dev->udev->dev, __func__, 7854dae9963SGreg Kroah-Hartman urb->actual_length, urb->transfer_buffer); 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvalds /* sync/async unlink faults aren't errors */ 78864771a0fSGreg Kroah-Hartman if (status && !(status == -ENOENT || 78964771a0fSGreg Kroah-Hartman status == -ECONNRESET || 79064771a0fSGreg Kroah-Hartman status == -ESHUTDOWN)) { 791fef526caSGreg Kroah-Hartman dev_dbg(&dev->udev->dev, 792fef526caSGreg Kroah-Hartman "%s: nonzero write bulk status received: %d\n", __func__, 793fef526caSGreg Kroah-Hartman status); 7941da177e4SLinus Torvalds } 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 7971da177e4SLinus Torvalds wake_up_interruptible(&dev->write_wait); 7981da177e4SLinus Torvalds } 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds /** 8021da177e4SLinus Torvalds * tower_probe 8031da177e4SLinus Torvalds * 8041da177e4SLinus Torvalds * Called by the usb core when a new device is connected that it thinks 8051da177e4SLinus Torvalds * this driver might be interested in. 8061da177e4SLinus Torvalds */ 8071da177e4SLinus Torvalds static int tower_probe (struct usb_interface *interface, const struct usb_device_id *id) 8081da177e4SLinus Torvalds { 8099d974b2aSGreg Kroah-Hartman struct device *idev = &interface->dev; 8101da177e4SLinus Torvalds struct usb_device *udev = interface_to_usbdev(interface); 8111da177e4SLinus Torvalds struct lego_usb_tower *dev = NULL; 812942a4873SMaksim Salau struct tower_get_version_reply *get_version_reply = NULL; 8131da177e4SLinus Torvalds int retval = -ENOMEM; 8141da177e4SLinus Torvalds int result; 8151da177e4SLinus Torvalds 816093cf723SSteven Cole /* allocate memory for our device state and initialize it */ 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds dev = kmalloc (sizeof(struct lego_usb_tower), GFP_KERNEL); 8191da177e4SLinus Torvalds 82049d8ffabSWolfram Sang if (!dev) 8211da177e4SLinus Torvalds goto exit; 8221da177e4SLinus Torvalds 82318bcbcfeSDaniel Walker mutex_init(&dev->lock); 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds dev->udev = udev; 8261da177e4SLinus Torvalds dev->open_count = 0; 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds dev->read_buffer = NULL; 8291da177e4SLinus Torvalds dev->read_buffer_length = 0; 8301da177e4SLinus Torvalds dev->read_packet_length = 0; 8311da177e4SLinus Torvalds spin_lock_init (&dev->read_buffer_lock); 8328f7e9473SNicholas Mc Guire dev->packet_timeout_jiffies = msecs_to_jiffies(packet_timeout); 8331da177e4SLinus Torvalds dev->read_last_arrival = jiffies; 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds init_waitqueue_head (&dev->read_wait); 8361da177e4SLinus Torvalds init_waitqueue_head (&dev->write_wait); 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds dev->interrupt_in_buffer = NULL; 8391da177e4SLinus Torvalds dev->interrupt_in_endpoint = NULL; 8401da177e4SLinus Torvalds dev->interrupt_in_urb = NULL; 8411da177e4SLinus Torvalds dev->interrupt_in_running = 0; 8421da177e4SLinus Torvalds dev->interrupt_in_done = 0; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds dev->interrupt_out_buffer = NULL; 8451da177e4SLinus Torvalds dev->interrupt_out_endpoint = NULL; 8461da177e4SLinus Torvalds dev->interrupt_out_urb = NULL; 8471da177e4SLinus Torvalds dev->interrupt_out_busy = 0; 8481da177e4SLinus Torvalds 8499b181166SJohan Hovold result = usb_find_common_endpoints_reverse(interface->cur_altsetting, 8509b181166SJohan Hovold NULL, NULL, 8519b181166SJohan Hovold &dev->interrupt_in_endpoint, 8529b181166SJohan Hovold &dev->interrupt_out_endpoint); 8539b181166SJohan Hovold if (result) { 8549b181166SJohan Hovold dev_err(idev, "interrupt endpoints not found\n"); 8559b181166SJohan Hovold retval = result; 8561da177e4SLinus Torvalds goto error; 8571da177e4SLinus Torvalds } 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvalds dev->read_buffer = kmalloc (read_buffer_size, GFP_KERNEL); 86049d8ffabSWolfram Sang if (!dev->read_buffer) 8611da177e4SLinus Torvalds goto error; 86229cc8897SKuninori Morimoto dev->interrupt_in_buffer = kmalloc (usb_endpoint_maxp(dev->interrupt_in_endpoint), GFP_KERNEL); 86349d8ffabSWolfram Sang if (!dev->interrupt_in_buffer) 8641da177e4SLinus Torvalds goto error; 8651da177e4SLinus Torvalds dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 866a131f41fSWolfram Sang if (!dev->interrupt_in_urb) 8671da177e4SLinus Torvalds goto error; 8681da177e4SLinus Torvalds dev->interrupt_out_buffer = kmalloc (write_buffer_size, GFP_KERNEL); 86949d8ffabSWolfram Sang if (!dev->interrupt_out_buffer) 8701da177e4SLinus Torvalds goto error; 8711da177e4SLinus Torvalds dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 872a131f41fSWolfram Sang if (!dev->interrupt_out_urb) 8731da177e4SLinus Torvalds goto error; 8741da177e4SLinus Torvalds dev->interrupt_in_interval = interrupt_in_interval ? interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 8751da177e4SLinus Torvalds dev->interrupt_out_interval = interrupt_out_interval ? interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 8761da177e4SLinus Torvalds 877942a4873SMaksim Salau get_version_reply = kmalloc(sizeof(*get_version_reply), GFP_KERNEL); 878942a4873SMaksim Salau 879942a4873SMaksim Salau if (!get_version_reply) { 880942a4873SMaksim Salau retval = -ENOMEM; 881942a4873SMaksim Salau goto error; 882942a4873SMaksim Salau } 883942a4873SMaksim Salau 8841da177e4SLinus Torvalds /* get the firmware version and log it */ 8851da177e4SLinus Torvalds result = usb_control_msg (udev, 8861da177e4SLinus Torvalds usb_rcvctrlpipe(udev, 0), 8871da177e4SLinus Torvalds LEGO_USB_TOWER_REQUEST_GET_VERSION, 8881da177e4SLinus Torvalds USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE, 8891da177e4SLinus Torvalds 0, 8901da177e4SLinus Torvalds 0, 891942a4873SMaksim Salau get_version_reply, 892942a4873SMaksim Salau sizeof(*get_version_reply), 8931da177e4SLinus Torvalds 1000); 8941da177e4SLinus Torvalds if (result < 0) { 8959d974b2aSGreg Kroah-Hartman dev_err(idev, "LEGO USB Tower get version control request failed\n"); 8961da177e4SLinus Torvalds retval = result; 8971da177e4SLinus Torvalds goto error; 8981da177e4SLinus Torvalds } 899942a4873SMaksim Salau dev_info(&interface->dev, 900942a4873SMaksim Salau "LEGO USB Tower firmware version is %d.%d build %d\n", 901942a4873SMaksim Salau get_version_reply->major, 902942a4873SMaksim Salau get_version_reply->minor, 903942a4873SMaksim Salau le16_to_cpu(get_version_reply->build_no)); 9041da177e4SLinus Torvalds 9052fae9e5aSGreg Kroah-Hartman /* we can register the device now, as it is ready */ 9062fae9e5aSGreg Kroah-Hartman usb_set_intfdata (interface, dev); 9072fae9e5aSGreg Kroah-Hartman 9082fae9e5aSGreg Kroah-Hartman retval = usb_register_dev (interface, &tower_class); 9092fae9e5aSGreg Kroah-Hartman 9102fae9e5aSGreg Kroah-Hartman if (retval) { 9112fae9e5aSGreg Kroah-Hartman /* something prevented us from registering this driver */ 9122fae9e5aSGreg Kroah-Hartman dev_err(idev, "Not able to get a minor for this device.\n"); 9132fae9e5aSGreg Kroah-Hartman usb_set_intfdata (interface, NULL); 9142fae9e5aSGreg Kroah-Hartman goto error; 9152fae9e5aSGreg Kroah-Hartman } 9162fae9e5aSGreg Kroah-Hartman dev->minor = interface->minor; 9172fae9e5aSGreg Kroah-Hartman 9182fae9e5aSGreg Kroah-Hartman /* let the user know what node this device is now attached to */ 9192fae9e5aSGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now attached to major " 9202fae9e5aSGreg Kroah-Hartman "%d minor %d\n", (dev->minor - LEGO_USB_TOWER_MINOR_BASE), 9212fae9e5aSGreg Kroah-Hartman USB_MAJOR, dev->minor); 9221da177e4SLinus Torvalds 9231da177e4SLinus Torvalds exit: 9240bd193d6SMaksim Salau kfree(get_version_reply); 9251da177e4SLinus Torvalds return retval; 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds error: 928942a4873SMaksim Salau kfree(get_version_reply); 9291da177e4SLinus Torvalds tower_delete(dev); 9301da177e4SLinus Torvalds return retval; 9311da177e4SLinus Torvalds } 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds 9341da177e4SLinus Torvalds /** 9351da177e4SLinus Torvalds * tower_disconnect 9361da177e4SLinus Torvalds * 9371da177e4SLinus Torvalds * Called by the usb core when the device is removed from the system. 9381da177e4SLinus Torvalds */ 9391da177e4SLinus Torvalds static void tower_disconnect (struct usb_interface *interface) 9401da177e4SLinus Torvalds { 9411da177e4SLinus Torvalds struct lego_usb_tower *dev; 9421da177e4SLinus Torvalds int minor; 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds dev = usb_get_intfdata (interface); 94578663eccSOliver Neukum mutex_lock(&open_disc_mutex); 9461da177e4SLinus Torvalds usb_set_intfdata (interface, NULL); 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds minor = dev->minor; 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds /* give back our minor */ 9511da177e4SLinus Torvalds usb_deregister_dev (interface, &tower_class); 9521da177e4SLinus Torvalds 95318bcbcfeSDaniel Walker mutex_lock(&dev->lock); 95478663eccSOliver Neukum mutex_unlock(&open_disc_mutex); 955d4ead16fSAlan Stern 9561da177e4SLinus Torvalds /* if the device is not opened, then we clean up right now */ 9571da177e4SLinus Torvalds if (!dev->open_count) { 95818bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 9591da177e4SLinus Torvalds tower_delete (dev); 9601da177e4SLinus Torvalds } else { 9611da177e4SLinus Torvalds dev->udev = NULL; 962d35b4ce1SOliver Neukum /* wake up pollers */ 963d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->read_wait); 964d35b4ce1SOliver Neukum wake_up_interruptible_all(&dev->write_wait); 96518bcbcfeSDaniel Walker mutex_unlock(&dev->lock); 9661da177e4SLinus Torvalds } 9671da177e4SLinus Torvalds 9681b29a375SGreg Kroah-Hartman dev_info(&interface->dev, "LEGO USB Tower #%d now disconnected\n", 9691b29a375SGreg Kroah-Hartman (minor - LEGO_USB_TOWER_MINOR_BASE)); 9701da177e4SLinus Torvalds } 9711da177e4SLinus Torvalds 97265db4305SGreg Kroah-Hartman module_usb_driver(tower_driver); 9731da177e4SLinus Torvalds 9741da177e4SLinus Torvalds MODULE_AUTHOR(DRIVER_AUTHOR); 9751da177e4SLinus Torvalds MODULE_DESCRIPTION(DRIVER_DESC); 9761da177e4SLinus Torvalds #ifdef MODULE_LICENSE 9771da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 9781da177e4SLinus Torvalds #endif 979