12824bd25SMichael Hund /** 22824bd25SMichael Hund * Generic USB driver for report based interrupt in/out devices 32824bd25SMichael Hund * like LD Didactic's USB devices. LD Didactic's USB devices are 42824bd25SMichael Hund * HID devices which do not use HID report definitons (they use 52824bd25SMichael Hund * raw interrupt in and our reports only for communication). 62824bd25SMichael Hund * 72824bd25SMichael Hund * This driver uses a ring buffer for time critical reading of 82824bd25SMichael Hund * interrupt in reports and provides read and write methods for 92824bd25SMichael Hund * raw interrupt reports (similar to the Windows HID driver). 102824bd25SMichael Hund * Devices based on the book USB COMPLETE by Jan Axelson may need 112824bd25SMichael Hund * such a compatibility to the Windows HID driver. 122824bd25SMichael Hund * 132824bd25SMichael Hund * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> 142824bd25SMichael Hund * 152824bd25SMichael Hund * This program is free software; you can redistribute it and/or 162824bd25SMichael Hund * modify it under the terms of the GNU General Public License as 172824bd25SMichael Hund * published by the Free Software Foundation; either version 2 of 182824bd25SMichael Hund * the License, or (at your option) any later version. 192824bd25SMichael Hund * 202824bd25SMichael Hund * Derived from Lego USB Tower driver 212824bd25SMichael Hund * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> 222824bd25SMichael Hund * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 232824bd25SMichael Hund */ 242824bd25SMichael Hund 252824bd25SMichael Hund #include <linux/kernel.h> 262824bd25SMichael Hund #include <linux/errno.h> 272824bd25SMichael Hund #include <linux/slab.h> 282824bd25SMichael Hund #include <linux/module.h> 294186ecf8SArjan van de Ven #include <linux/mutex.h> 302824bd25SMichael Hund 312824bd25SMichael Hund #include <asm/uaccess.h> 322824bd25SMichael Hund #include <linux/input.h> 332824bd25SMichael Hund #include <linux/usb.h> 342824bd25SMichael Hund #include <linux/poll.h> 352824bd25SMichael Hund 362824bd25SMichael Hund /* Define these values to match your devices */ 372824bd25SMichael Hund #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */ 38ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */ 39ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */ 40ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */ 41ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */ 42ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */ 43ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */ 44ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */ 45ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */ 46ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */ 47ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */ 48ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */ 49ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */ 50ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */ 51ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */ 52ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */ 53ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */ 54ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */ 55ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */ 56ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/ 57ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */ 58ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */ 59ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */ 60ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */ 61ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */ 62ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */ 63ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */ 64ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */ 65ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */ 66ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */ 67ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */ 68ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */ 69ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */ 70ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */ 712824bd25SMichael Hund 722824bd25SMichael Hund #ifdef CONFIG_USB_DYNAMIC_MINORS 732824bd25SMichael Hund #define USB_LD_MINOR_BASE 0 742824bd25SMichael Hund #else 752824bd25SMichael Hund #define USB_LD_MINOR_BASE 176 762824bd25SMichael Hund #endif 772824bd25SMichael Hund 782824bd25SMichael Hund /* table of devices that work with this driver */ 7933b9e162SNémeth Márton static const struct usb_device_id ld_usb_table[] = { 80ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) }, 81ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) }, 82ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) }, 83ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) }, 84ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) }, 85ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) }, 86ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) }, 87ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) }, 88ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) }, 89ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) }, 90ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) }, 91ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) }, 92ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) }, 93ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) }, 94ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) }, 95ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) }, 96ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) }, 97ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) }, 98ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) }, 99ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) }, 100ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) }, 101ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) }, 102ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) }, 103ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) }, 104ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) }, 105ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) }, 106ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) }, 107ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) }, 108ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) }, 109ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) }, 110ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) }, 111ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) }, 1122824bd25SMichael Hund { } /* Terminating entry */ 1132824bd25SMichael Hund }; 1142824bd25SMichael Hund MODULE_DEVICE_TABLE(usb, ld_usb_table); 115ce97cac8SMichael Hund MODULE_VERSION("V0.14"); 1162824bd25SMichael Hund MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); 1172824bd25SMichael Hund MODULE_DESCRIPTION("LD USB Driver"); 1182824bd25SMichael Hund MODULE_LICENSE("GPL"); 1192824bd25SMichael Hund MODULE_SUPPORTED_DEVICE("LD USB Devices"); 1202824bd25SMichael Hund 1212824bd25SMichael Hund /* All interrupt in transfers are collected in a ring buffer to 1222824bd25SMichael Hund * avoid racing conditions and get better performance of the driver. 1232824bd25SMichael Hund */ 1242824bd25SMichael Hund static int ring_buffer_size = 128; 1252824bd25SMichael Hund module_param(ring_buffer_size, int, 0); 1262824bd25SMichael Hund MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); 1272824bd25SMichael Hund 1282824bd25SMichael Hund /* The write_buffer can contain more than one interrupt out transfer. 1292824bd25SMichael Hund */ 1302824bd25SMichael Hund static int write_buffer_size = 10; 1312824bd25SMichael Hund module_param(write_buffer_size, int, 0); 1322824bd25SMichael Hund MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); 1332824bd25SMichael Hund 1342824bd25SMichael Hund /* As of kernel version 2.6.4 ehci-hcd uses an 1352824bd25SMichael Hund * "only one interrupt transfer per frame" shortcut 1362824bd25SMichael Hund * to simplify the scheduling of periodic transfers. 1372824bd25SMichael Hund * This conflicts with our standard 1ms intervals for in and out URBs. 1382824bd25SMichael Hund * We use default intervals of 2ms for in and 2ms for out transfers, 1392824bd25SMichael Hund * which should be fast enough. 1402824bd25SMichael Hund * Increase the interval to allow more devices that do interrupt transfers, 1412824bd25SMichael Hund * or set to 1 to use the standard interval from the endpoint descriptors. 1422824bd25SMichael Hund */ 1432824bd25SMichael Hund static int min_interrupt_in_interval = 2; 1442824bd25SMichael Hund module_param(min_interrupt_in_interval, int, 0); 1452824bd25SMichael Hund MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); 1462824bd25SMichael Hund 1472824bd25SMichael Hund static int min_interrupt_out_interval = 2; 1482824bd25SMichael Hund module_param(min_interrupt_out_interval, int, 0); 1492824bd25SMichael Hund MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); 1502824bd25SMichael Hund 1512824bd25SMichael Hund /* Structure to hold all of our device specific stuff */ 1522824bd25SMichael Hund struct ld_usb { 153ce0d7d3fSDaniel Walker struct mutex mutex; /* locks this structure */ 1542824bd25SMichael Hund struct usb_interface* intf; /* save off the usb interface pointer */ 1552824bd25SMichael Hund 1562824bd25SMichael Hund int open_count; /* number of times this port has been opened */ 1572824bd25SMichael Hund 1582824bd25SMichael Hund char* ring_buffer; 1592824bd25SMichael Hund unsigned int ring_head; 1602824bd25SMichael Hund unsigned int ring_tail; 1612824bd25SMichael Hund 1622824bd25SMichael Hund wait_queue_head_t read_wait; 1632824bd25SMichael Hund wait_queue_head_t write_wait; 1642824bd25SMichael Hund 1652824bd25SMichael Hund char* interrupt_in_buffer; 1662824bd25SMichael Hund struct usb_endpoint_descriptor* interrupt_in_endpoint; 1672824bd25SMichael Hund struct urb* interrupt_in_urb; 1682824bd25SMichael Hund int interrupt_in_interval; 1692824bd25SMichael Hund size_t interrupt_in_endpoint_size; 1702824bd25SMichael Hund int interrupt_in_running; 1712824bd25SMichael Hund int interrupt_in_done; 1729d33efd9SOliver Neukum int buffer_overflow; 1739d33efd9SOliver Neukum spinlock_t rbsl; 1742824bd25SMichael Hund 1752824bd25SMichael Hund char* interrupt_out_buffer; 1762824bd25SMichael Hund struct usb_endpoint_descriptor* interrupt_out_endpoint; 1772824bd25SMichael Hund struct urb* interrupt_out_urb; 1782824bd25SMichael Hund int interrupt_out_interval; 1792824bd25SMichael Hund size_t interrupt_out_endpoint_size; 1802824bd25SMichael Hund int interrupt_out_busy; 1812824bd25SMichael Hund }; 1822824bd25SMichael Hund 1832824bd25SMichael Hund static struct usb_driver ld_usb_driver; 1842824bd25SMichael Hund 1852824bd25SMichael Hund /** 1862824bd25SMichael Hund * ld_usb_abort_transfers 1872824bd25SMichael Hund * aborts transfers and frees associated data structures 1882824bd25SMichael Hund */ 1892824bd25SMichael Hund static void ld_usb_abort_transfers(struct ld_usb *dev) 1902824bd25SMichael Hund { 1912824bd25SMichael Hund /* shutdown transfer */ 1922824bd25SMichael Hund if (dev->interrupt_in_running) { 1932824bd25SMichael Hund dev->interrupt_in_running = 0; 1942824bd25SMichael Hund if (dev->intf) 1952824bd25SMichael Hund usb_kill_urb(dev->interrupt_in_urb); 1962824bd25SMichael Hund } 1972824bd25SMichael Hund if (dev->interrupt_out_busy) 1982824bd25SMichael Hund if (dev->intf) 1992824bd25SMichael Hund usb_kill_urb(dev->interrupt_out_urb); 2002824bd25SMichael Hund } 2012824bd25SMichael Hund 2022824bd25SMichael Hund /** 2032824bd25SMichael Hund * ld_usb_delete 2042824bd25SMichael Hund */ 2052824bd25SMichael Hund static void ld_usb_delete(struct ld_usb *dev) 2062824bd25SMichael Hund { 2072824bd25SMichael Hund ld_usb_abort_transfers(dev); 2082824bd25SMichael Hund 2092824bd25SMichael Hund /* free data structures */ 2102824bd25SMichael Hund usb_free_urb(dev->interrupt_in_urb); 2112824bd25SMichael Hund usb_free_urb(dev->interrupt_out_urb); 2122824bd25SMichael Hund kfree(dev->ring_buffer); 2132824bd25SMichael Hund kfree(dev->interrupt_in_buffer); 2142824bd25SMichael Hund kfree(dev->interrupt_out_buffer); 2152824bd25SMichael Hund kfree(dev); 2162824bd25SMichael Hund } 2172824bd25SMichael Hund 2182824bd25SMichael Hund /** 2192824bd25SMichael Hund * ld_usb_interrupt_in_callback 2202824bd25SMichael Hund */ 2217d12e780SDavid Howells static void ld_usb_interrupt_in_callback(struct urb *urb) 2222824bd25SMichael Hund { 2232824bd25SMichael Hund struct ld_usb *dev = urb->context; 2242824bd25SMichael Hund size_t *actual_buffer; 2252824bd25SMichael Hund unsigned int next_ring_head; 226491c021eSGreg Kroah-Hartman int status = urb->status; 2272824bd25SMichael Hund int retval; 2282824bd25SMichael Hund 229491c021eSGreg Kroah-Hartman if (status) { 230491c021eSGreg Kroah-Hartman if (status == -ENOENT || 231491c021eSGreg Kroah-Hartman status == -ECONNRESET || 232491c021eSGreg Kroah-Hartman status == -ESHUTDOWN) { 2332824bd25SMichael Hund goto exit; 2342824bd25SMichael Hund } else { 235457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, 236457163c4SGreg Kroah-Hartman "%s: nonzero status received: %d\n", __func__, 237457163c4SGreg Kroah-Hartman status); 2389d33efd9SOliver Neukum spin_lock(&dev->rbsl); 2392824bd25SMichael Hund goto resubmit; /* maybe we can recover */ 2402824bd25SMichael Hund } 2412824bd25SMichael Hund } 2422824bd25SMichael Hund 2439d33efd9SOliver Neukum spin_lock(&dev->rbsl); 2442824bd25SMichael Hund if (urb->actual_length > 0) { 2452824bd25SMichael Hund next_ring_head = (dev->ring_head+1) % ring_buffer_size; 2462824bd25SMichael Hund if (next_ring_head != dev->ring_tail) { 2472824bd25SMichael Hund actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 2482824bd25SMichael Hund /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ 2492824bd25SMichael Hund *actual_buffer = urb->actual_length; 2502824bd25SMichael Hund memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); 2512824bd25SMichael Hund dev->ring_head = next_ring_head; 252457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, "%s: received %d bytes\n", 253441b62c1SHarvey Harrison __func__, urb->actual_length); 2549d33efd9SOliver Neukum } else { 2552824bd25SMichael Hund dev_warn(&dev->intf->dev, 2562824bd25SMichael Hund "Ring buffer overflow, %d bytes dropped\n", 2572824bd25SMichael Hund urb->actual_length); 2589d33efd9SOliver Neukum dev->buffer_overflow = 1; 2599d33efd9SOliver Neukum } 2602824bd25SMichael Hund } 2612824bd25SMichael Hund 2622824bd25SMichael Hund resubmit: 2632824bd25SMichael Hund /* resubmit if we're still running */ 2649d33efd9SOliver Neukum if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) { 2652824bd25SMichael Hund retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 2669d33efd9SOliver Neukum if (retval) { 2672824bd25SMichael Hund dev_err(&dev->intf->dev, 2682824bd25SMichael Hund "usb_submit_urb failed (%d)\n", retval); 2699d33efd9SOliver Neukum dev->buffer_overflow = 1; 2702824bd25SMichael Hund } 2719d33efd9SOliver Neukum } 2729d33efd9SOliver Neukum spin_unlock(&dev->rbsl); 2732824bd25SMichael Hund exit: 2742824bd25SMichael Hund dev->interrupt_in_done = 1; 2752824bd25SMichael Hund wake_up_interruptible(&dev->read_wait); 2762824bd25SMichael Hund } 2772824bd25SMichael Hund 2782824bd25SMichael Hund /** 2792824bd25SMichael Hund * ld_usb_interrupt_out_callback 2802824bd25SMichael Hund */ 2817d12e780SDavid Howells static void ld_usb_interrupt_out_callback(struct urb *urb) 2822824bd25SMichael Hund { 2832824bd25SMichael Hund struct ld_usb *dev = urb->context; 284491c021eSGreg Kroah-Hartman int status = urb->status; 2852824bd25SMichael Hund 2862824bd25SMichael Hund /* sync/async unlink faults aren't errors */ 287491c021eSGreg Kroah-Hartman if (status && !(status == -ENOENT || 288491c021eSGreg Kroah-Hartman status == -ECONNRESET || 289491c021eSGreg Kroah-Hartman status == -ESHUTDOWN)) 290457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, 2912824bd25SMichael Hund "%s - nonzero write interrupt status received: %d\n", 292441b62c1SHarvey Harrison __func__, status); 2932824bd25SMichael Hund 2942824bd25SMichael Hund dev->interrupt_out_busy = 0; 2952824bd25SMichael Hund wake_up_interruptible(&dev->write_wait); 2962824bd25SMichael Hund } 2972824bd25SMichael Hund 2982824bd25SMichael Hund /** 2992824bd25SMichael Hund * ld_usb_open 3002824bd25SMichael Hund */ 3012824bd25SMichael Hund static int ld_usb_open(struct inode *inode, struct file *file) 3022824bd25SMichael Hund { 3032824bd25SMichael Hund struct ld_usb *dev; 3042824bd25SMichael Hund int subminor; 305d4ead16fSAlan Stern int retval; 3062824bd25SMichael Hund struct usb_interface *interface; 3072824bd25SMichael Hund 3082824bd25SMichael Hund nonseekable_open(inode, file); 3092824bd25SMichael Hund subminor = iminor(inode); 3102824bd25SMichael Hund 3112824bd25SMichael Hund interface = usb_find_interface(&ld_usb_driver, subminor); 3122824bd25SMichael Hund 3132824bd25SMichael Hund if (!interface) { 314b22862e5SGreg Kroah-Hartman printk(KERN_ERR "%s - error, can't find device for minor %d\n", 315441b62c1SHarvey Harrison __func__, subminor); 316d4ead16fSAlan Stern return -ENODEV; 3172824bd25SMichael Hund } 3182824bd25SMichael Hund 3192824bd25SMichael Hund dev = usb_get_intfdata(interface); 3202824bd25SMichael Hund 3216248c52fSOliver Neukum if (!dev) 322d4ead16fSAlan Stern return -ENODEV; 3232824bd25SMichael Hund 3242824bd25SMichael Hund /* lock this device */ 3256248c52fSOliver Neukum if (mutex_lock_interruptible(&dev->mutex)) 326d4ead16fSAlan Stern return -ERESTARTSYS; 3272824bd25SMichael Hund 3282824bd25SMichael Hund /* allow opening only once */ 3292824bd25SMichael Hund if (dev->open_count) { 3302824bd25SMichael Hund retval = -EBUSY; 3312824bd25SMichael Hund goto unlock_exit; 3322824bd25SMichael Hund } 3332824bd25SMichael Hund dev->open_count = 1; 3342824bd25SMichael Hund 3352824bd25SMichael Hund /* initialize in direction */ 3362824bd25SMichael Hund dev->ring_head = 0; 3372824bd25SMichael Hund dev->ring_tail = 0; 3389d33efd9SOliver Neukum dev->buffer_overflow = 0; 3392824bd25SMichael Hund usb_fill_int_urb(dev->interrupt_in_urb, 3402824bd25SMichael Hund interface_to_usbdev(interface), 3412824bd25SMichael Hund usb_rcvintpipe(interface_to_usbdev(interface), 3422824bd25SMichael Hund dev->interrupt_in_endpoint->bEndpointAddress), 3432824bd25SMichael Hund dev->interrupt_in_buffer, 3442824bd25SMichael Hund dev->interrupt_in_endpoint_size, 3452824bd25SMichael Hund ld_usb_interrupt_in_callback, 3462824bd25SMichael Hund dev, 3472824bd25SMichael Hund dev->interrupt_in_interval); 3482824bd25SMichael Hund 3492824bd25SMichael Hund dev->interrupt_in_running = 1; 3502824bd25SMichael Hund dev->interrupt_in_done = 0; 3512824bd25SMichael Hund 3522824bd25SMichael Hund retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 3532824bd25SMichael Hund if (retval) { 3542824bd25SMichael Hund dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); 3552824bd25SMichael Hund dev->interrupt_in_running = 0; 3562824bd25SMichael Hund dev->open_count = 0; 3572824bd25SMichael Hund goto unlock_exit; 3582824bd25SMichael Hund } 3592824bd25SMichael Hund 3602824bd25SMichael Hund /* save device in the file's private structure */ 3612824bd25SMichael Hund file->private_data = dev; 3622824bd25SMichael Hund 3632824bd25SMichael Hund unlock_exit: 364ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 3652824bd25SMichael Hund 3662824bd25SMichael Hund return retval; 3672824bd25SMichael Hund } 3682824bd25SMichael Hund 3692824bd25SMichael Hund /** 3702824bd25SMichael Hund * ld_usb_release 3712824bd25SMichael Hund */ 3722824bd25SMichael Hund static int ld_usb_release(struct inode *inode, struct file *file) 3732824bd25SMichael Hund { 3742824bd25SMichael Hund struct ld_usb *dev; 3752824bd25SMichael Hund int retval = 0; 3762824bd25SMichael Hund 3772824bd25SMichael Hund dev = file->private_data; 3782824bd25SMichael Hund 3792824bd25SMichael Hund if (dev == NULL) { 3802824bd25SMichael Hund retval = -ENODEV; 3812824bd25SMichael Hund goto exit; 3822824bd25SMichael Hund } 3832824bd25SMichael Hund 384ce0d7d3fSDaniel Walker if (mutex_lock_interruptible(&dev->mutex)) { 3852824bd25SMichael Hund retval = -ERESTARTSYS; 3862824bd25SMichael Hund goto exit; 3872824bd25SMichael Hund } 3882824bd25SMichael Hund 3892824bd25SMichael Hund if (dev->open_count != 1) { 3902824bd25SMichael Hund retval = -ENODEV; 3912824bd25SMichael Hund goto unlock_exit; 3922824bd25SMichael Hund } 3932824bd25SMichael Hund if (dev->intf == NULL) { 3942824bd25SMichael Hund /* the device was unplugged before the file was released */ 395ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 3962824bd25SMichael Hund /* unlock here as ld_usb_delete frees dev */ 3972824bd25SMichael Hund ld_usb_delete(dev); 3982824bd25SMichael Hund goto exit; 3992824bd25SMichael Hund } 4002824bd25SMichael Hund 4012824bd25SMichael Hund /* wait until write transfer is finished */ 4022824bd25SMichael Hund if (dev->interrupt_out_busy) 4032824bd25SMichael Hund wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4042824bd25SMichael Hund ld_usb_abort_transfers(dev); 4052824bd25SMichael Hund dev->open_count = 0; 4062824bd25SMichael Hund 4072824bd25SMichael Hund unlock_exit: 408ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 4092824bd25SMichael Hund 4102824bd25SMichael Hund exit: 4112824bd25SMichael Hund return retval; 4122824bd25SMichael Hund } 4132824bd25SMichael Hund 4142824bd25SMichael Hund /** 4152824bd25SMichael Hund * ld_usb_poll 4162824bd25SMichael Hund */ 4172824bd25SMichael Hund static unsigned int ld_usb_poll(struct file *file, poll_table *wait) 4182824bd25SMichael Hund { 4192824bd25SMichael Hund struct ld_usb *dev; 4202824bd25SMichael Hund unsigned int mask = 0; 4212824bd25SMichael Hund 4222824bd25SMichael Hund dev = file->private_data; 4232824bd25SMichael Hund 424d12b85e7SOliver Neukum if (!dev->intf) 425d12b85e7SOliver Neukum return POLLERR | POLLHUP; 426d12b85e7SOliver Neukum 4272824bd25SMichael Hund poll_wait(file, &dev->read_wait, wait); 4282824bd25SMichael Hund poll_wait(file, &dev->write_wait, wait); 4292824bd25SMichael Hund 4302824bd25SMichael Hund if (dev->ring_head != dev->ring_tail) 4312824bd25SMichael Hund mask |= POLLIN | POLLRDNORM; 4322824bd25SMichael Hund if (!dev->interrupt_out_busy) 4332824bd25SMichael Hund mask |= POLLOUT | POLLWRNORM; 4342824bd25SMichael Hund 4352824bd25SMichael Hund return mask; 4362824bd25SMichael Hund } 4372824bd25SMichael Hund 4382824bd25SMichael Hund /** 4392824bd25SMichael Hund * ld_usb_read 4402824bd25SMichael Hund */ 4412824bd25SMichael Hund static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, 4422824bd25SMichael Hund loff_t *ppos) 4432824bd25SMichael Hund { 4442824bd25SMichael Hund struct ld_usb *dev; 4452824bd25SMichael Hund size_t *actual_buffer; 4462824bd25SMichael Hund size_t bytes_to_read; 4472824bd25SMichael Hund int retval = 0; 4489d33efd9SOliver Neukum int rv; 4492824bd25SMichael Hund 4502824bd25SMichael Hund dev = file->private_data; 4512824bd25SMichael Hund 4522824bd25SMichael Hund /* verify that we actually have some data to read */ 4532824bd25SMichael Hund if (count == 0) 4542824bd25SMichael Hund goto exit; 4552824bd25SMichael Hund 4562824bd25SMichael Hund /* lock this object */ 457ce0d7d3fSDaniel Walker if (mutex_lock_interruptible(&dev->mutex)) { 4582824bd25SMichael Hund retval = -ERESTARTSYS; 4592824bd25SMichael Hund goto exit; 4602824bd25SMichael Hund } 4612824bd25SMichael Hund 4622824bd25SMichael Hund /* verify that the device wasn't unplugged */ 4632824bd25SMichael Hund if (dev->intf == NULL) { 4642824bd25SMichael Hund retval = -ENODEV; 465b22862e5SGreg Kroah-Hartman printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); 4662824bd25SMichael Hund goto unlock_exit; 4672824bd25SMichael Hund } 4682824bd25SMichael Hund 4692824bd25SMichael Hund /* wait for data */ 4709d33efd9SOliver Neukum spin_lock_irq(&dev->rbsl); 4712824bd25SMichael Hund if (dev->ring_head == dev->ring_tail) { 4729d33efd9SOliver Neukum dev->interrupt_in_done = 0; 4739d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 4742824bd25SMichael Hund if (file->f_flags & O_NONBLOCK) { 4752824bd25SMichael Hund retval = -EAGAIN; 4762824bd25SMichael Hund goto unlock_exit; 4772824bd25SMichael Hund } 4782824bd25SMichael Hund retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); 4792824bd25SMichael Hund if (retval < 0) 4802824bd25SMichael Hund goto unlock_exit; 4819d33efd9SOliver Neukum } else { 4829d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 4832824bd25SMichael Hund } 4842824bd25SMichael Hund 4852824bd25SMichael Hund /* actual_buffer contains actual_length + interrupt_in_buffer */ 4862824bd25SMichael Hund actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size)); 4872824bd25SMichael Hund bytes_to_read = min(count, *actual_buffer); 4882824bd25SMichael Hund if (bytes_to_read < *actual_buffer) 489dd7d5008SAlexey Dobriyan dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n", 4902824bd25SMichael Hund *actual_buffer-bytes_to_read); 4912824bd25SMichael Hund 4922824bd25SMichael Hund /* copy one interrupt_in_buffer from ring_buffer into userspace */ 4932824bd25SMichael Hund if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { 4942824bd25SMichael Hund retval = -EFAULT; 4952824bd25SMichael Hund goto unlock_exit; 4962824bd25SMichael Hund } 4972824bd25SMichael Hund dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; 4982824bd25SMichael Hund 4992824bd25SMichael Hund retval = bytes_to_read; 5002824bd25SMichael Hund 5019d33efd9SOliver Neukum spin_lock_irq(&dev->rbsl); 5029d33efd9SOliver Neukum if (dev->buffer_overflow) { 5039d33efd9SOliver Neukum dev->buffer_overflow = 0; 5049d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 5059d33efd9SOliver Neukum rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 5069d33efd9SOliver Neukum if (rv < 0) 5079d33efd9SOliver Neukum dev->buffer_overflow = 1; 5089d33efd9SOliver Neukum } else { 5099d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 5109d33efd9SOliver Neukum } 5119d33efd9SOliver Neukum 5122824bd25SMichael Hund unlock_exit: 5132824bd25SMichael Hund /* unlock the device */ 514ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 5152824bd25SMichael Hund 5162824bd25SMichael Hund exit: 5172824bd25SMichael Hund return retval; 5182824bd25SMichael Hund } 5192824bd25SMichael Hund 5202824bd25SMichael Hund /** 5212824bd25SMichael Hund * ld_usb_write 5222824bd25SMichael Hund */ 5232824bd25SMichael Hund static ssize_t ld_usb_write(struct file *file, const char __user *buffer, 5242824bd25SMichael Hund size_t count, loff_t *ppos) 5252824bd25SMichael Hund { 5262824bd25SMichael Hund struct ld_usb *dev; 5272824bd25SMichael Hund size_t bytes_to_write; 5282824bd25SMichael Hund int retval = 0; 5292824bd25SMichael Hund 5302824bd25SMichael Hund dev = file->private_data; 5312824bd25SMichael Hund 5322824bd25SMichael Hund /* verify that we actually have some data to write */ 5332824bd25SMichael Hund if (count == 0) 5342824bd25SMichael Hund goto exit; 5352824bd25SMichael Hund 5362824bd25SMichael Hund /* lock this object */ 537ce0d7d3fSDaniel Walker if (mutex_lock_interruptible(&dev->mutex)) { 5382824bd25SMichael Hund retval = -ERESTARTSYS; 5392824bd25SMichael Hund goto exit; 5402824bd25SMichael Hund } 5412824bd25SMichael Hund 5422824bd25SMichael Hund /* verify that the device wasn't unplugged */ 5432824bd25SMichael Hund if (dev->intf == NULL) { 5442824bd25SMichael Hund retval = -ENODEV; 545b22862e5SGreg Kroah-Hartman printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); 5462824bd25SMichael Hund goto unlock_exit; 5472824bd25SMichael Hund } 5482824bd25SMichael Hund 5492824bd25SMichael Hund /* wait until previous transfer is finished */ 5502824bd25SMichael Hund if (dev->interrupt_out_busy) { 5512824bd25SMichael Hund if (file->f_flags & O_NONBLOCK) { 5522824bd25SMichael Hund retval = -EAGAIN; 5532824bd25SMichael Hund goto unlock_exit; 5542824bd25SMichael Hund } 5552824bd25SMichael Hund retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); 5562824bd25SMichael Hund if (retval < 0) { 5572824bd25SMichael Hund goto unlock_exit; 5582824bd25SMichael Hund } 5592824bd25SMichael Hund } 5602824bd25SMichael Hund 5612824bd25SMichael Hund /* write the data into interrupt_out_buffer from userspace */ 5622824bd25SMichael Hund bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); 5632824bd25SMichael Hund if (bytes_to_write < count) 564dd7d5008SAlexey Dobriyan dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write); 565457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", 566457163c4SGreg Kroah-Hartman __func__, count, bytes_to_write); 5672824bd25SMichael Hund 5682824bd25SMichael Hund if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 5692824bd25SMichael Hund retval = -EFAULT; 5702824bd25SMichael Hund goto unlock_exit; 5712824bd25SMichael Hund } 5722824bd25SMichael Hund 5732824bd25SMichael Hund if (dev->interrupt_out_endpoint == NULL) { 5742824bd25SMichael Hund /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ 5752824bd25SMichael Hund retval = usb_control_msg(interface_to_usbdev(dev->intf), 5762824bd25SMichael Hund usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), 5772824bd25SMichael Hund 9, 5782824bd25SMichael Hund USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 5792824bd25SMichael Hund 1 << 8, 0, 5802824bd25SMichael Hund dev->interrupt_out_buffer, 5812824bd25SMichael Hund bytes_to_write, 5822824bd25SMichael Hund USB_CTRL_SET_TIMEOUT * HZ); 5832824bd25SMichael Hund if (retval < 0) 584b22862e5SGreg Kroah-Hartman dev_err(&dev->intf->dev, 585b22862e5SGreg Kroah-Hartman "Couldn't submit HID_REQ_SET_REPORT %d\n", 586b22862e5SGreg Kroah-Hartman retval); 5872824bd25SMichael Hund goto unlock_exit; 5882824bd25SMichael Hund } 5892824bd25SMichael Hund 5902824bd25SMichael Hund /* send off the urb */ 5912824bd25SMichael Hund usb_fill_int_urb(dev->interrupt_out_urb, 5922824bd25SMichael Hund interface_to_usbdev(dev->intf), 5932824bd25SMichael Hund usb_sndintpipe(interface_to_usbdev(dev->intf), 5942824bd25SMichael Hund dev->interrupt_out_endpoint->bEndpointAddress), 5952824bd25SMichael Hund dev->interrupt_out_buffer, 5962824bd25SMichael Hund bytes_to_write, 5972824bd25SMichael Hund ld_usb_interrupt_out_callback, 5982824bd25SMichael Hund dev, 5992824bd25SMichael Hund dev->interrupt_out_interval); 6002824bd25SMichael Hund 6012824bd25SMichael Hund dev->interrupt_out_busy = 1; 6022824bd25SMichael Hund wmb(); 6032824bd25SMichael Hund 6042824bd25SMichael Hund retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 6052824bd25SMichael Hund if (retval) { 6062824bd25SMichael Hund dev->interrupt_out_busy = 0; 607b22862e5SGreg Kroah-Hartman dev_err(&dev->intf->dev, 608b22862e5SGreg Kroah-Hartman "Couldn't submit interrupt_out_urb %d\n", retval); 6092824bd25SMichael Hund goto unlock_exit; 6102824bd25SMichael Hund } 6112824bd25SMichael Hund retval = bytes_to_write; 6122824bd25SMichael Hund 6132824bd25SMichael Hund unlock_exit: 6142824bd25SMichael Hund /* unlock the device */ 615ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 6162824bd25SMichael Hund 6172824bd25SMichael Hund exit: 6182824bd25SMichael Hund return retval; 6192824bd25SMichael Hund } 6202824bd25SMichael Hund 6212824bd25SMichael Hund /* file operations needed when we register this driver */ 622066202ddSLuiz Fernando N. Capitulino static const struct file_operations ld_usb_fops = { 6232824bd25SMichael Hund .owner = THIS_MODULE, 6242824bd25SMichael Hund .read = ld_usb_read, 6252824bd25SMichael Hund .write = ld_usb_write, 6262824bd25SMichael Hund .open = ld_usb_open, 6272824bd25SMichael Hund .release = ld_usb_release, 6282824bd25SMichael Hund .poll = ld_usb_poll, 6296038f373SArnd Bergmann .llseek = no_llseek, 6302824bd25SMichael Hund }; 6312824bd25SMichael Hund 6322824bd25SMichael Hund /* 6332824bd25SMichael Hund * usb class driver info in order to get a minor number from the usb core, 634595b14cbSGreg Kroah-Hartman * and to have the device registered with the driver core 6352824bd25SMichael Hund */ 6362824bd25SMichael Hund static struct usb_class_driver ld_usb_class = { 6372824bd25SMichael Hund .name = "ldusb%d", 6382824bd25SMichael Hund .fops = &ld_usb_fops, 6392824bd25SMichael Hund .minor_base = USB_LD_MINOR_BASE, 6402824bd25SMichael Hund }; 6412824bd25SMichael Hund 6422824bd25SMichael Hund /** 6432824bd25SMichael Hund * ld_usb_probe 6442824bd25SMichael Hund * 6452824bd25SMichael Hund * Called by the usb core when a new device is connected that it thinks 6462824bd25SMichael Hund * this driver might be interested in. 6472824bd25SMichael Hund */ 6482824bd25SMichael Hund static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) 6492824bd25SMichael Hund { 6502824bd25SMichael Hund struct usb_device *udev = interface_to_usbdev(intf); 6512824bd25SMichael Hund struct ld_usb *dev = NULL; 6522824bd25SMichael Hund struct usb_host_interface *iface_desc; 6532824bd25SMichael Hund struct usb_endpoint_descriptor *endpoint; 6542824bd25SMichael Hund char *buffer; 6552824bd25SMichael Hund int i; 6562824bd25SMichael Hund int retval = -ENOMEM; 6572824bd25SMichael Hund 658b595076aSUwe Kleine-König /* allocate memory for our device state and initialize it */ 6592824bd25SMichael Hund 6601144cf7aSOliver Neukum dev = kzalloc(sizeof(*dev), GFP_KERNEL); 6612824bd25SMichael Hund if (dev == NULL) { 6622824bd25SMichael Hund dev_err(&intf->dev, "Out of memory\n"); 6632824bd25SMichael Hund goto exit; 6642824bd25SMichael Hund } 665ce0d7d3fSDaniel Walker mutex_init(&dev->mutex); 6669d33efd9SOliver Neukum spin_lock_init(&dev->rbsl); 6672824bd25SMichael Hund dev->intf = intf; 6682824bd25SMichael Hund init_waitqueue_head(&dev->read_wait); 6692824bd25SMichael Hund init_waitqueue_head(&dev->write_wait); 6702824bd25SMichael Hund 6712824bd25SMichael Hund /* workaround for early firmware versions on fast computers */ 6722824bd25SMichael Hund if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && 673ba3e66e9SMichael Hund ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) || 674ba3e66e9SMichael Hund (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) && 6752824bd25SMichael Hund (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { 6762824bd25SMichael Hund buffer = kmalloc(256, GFP_KERNEL); 677a6db592eSMichael Hund if (buffer == NULL) { 678a6db592eSMichael Hund dev_err(&intf->dev, "Couldn't allocate string buffer\n"); 679a6db592eSMichael Hund goto error; 680a6db592eSMichael Hund } 6812824bd25SMichael Hund /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ 6822824bd25SMichael Hund usb_string(udev, 255, buffer, 256); 6832824bd25SMichael Hund kfree(buffer); 6842824bd25SMichael Hund } 6852824bd25SMichael Hund 6862824bd25SMichael Hund iface_desc = intf->cur_altsetting; 6872824bd25SMichael Hund 6882824bd25SMichael Hund /* set up the endpoint information */ 6892824bd25SMichael Hund for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { 6902824bd25SMichael Hund endpoint = &iface_desc->endpoint[i].desc; 6912824bd25SMichael Hund 6925482687bSLuiz Fernando N. Capitulino if (usb_endpoint_is_int_in(endpoint)) 6932824bd25SMichael Hund dev->interrupt_in_endpoint = endpoint; 6942824bd25SMichael Hund 6955482687bSLuiz Fernando N. Capitulino if (usb_endpoint_is_int_out(endpoint)) 6962824bd25SMichael Hund dev->interrupt_out_endpoint = endpoint; 6972824bd25SMichael Hund } 6982824bd25SMichael Hund if (dev->interrupt_in_endpoint == NULL) { 6992824bd25SMichael Hund dev_err(&intf->dev, "Interrupt in endpoint not found\n"); 7002824bd25SMichael Hund goto error; 7012824bd25SMichael Hund } 7022824bd25SMichael Hund if (dev->interrupt_out_endpoint == NULL) 7032824bd25SMichael Hund dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); 7042824bd25SMichael Hund 70529cc8897SKuninori Morimoto dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); 7062824bd25SMichael Hund dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL); 7072824bd25SMichael Hund if (!dev->ring_buffer) { 7082824bd25SMichael Hund dev_err(&intf->dev, "Couldn't allocate ring_buffer\n"); 7092824bd25SMichael Hund goto error; 7102824bd25SMichael Hund } 7112824bd25SMichael Hund dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 7122824bd25SMichael Hund if (!dev->interrupt_in_buffer) { 7132824bd25SMichael Hund dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n"); 7142824bd25SMichael Hund goto error; 7152824bd25SMichael Hund } 7162824bd25SMichael Hund dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 7172d403903SWolfram Sang if (!dev->interrupt_in_urb) 7182824bd25SMichael Hund goto error; 71929cc8897SKuninori Morimoto dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) : 7202824bd25SMichael Hund udev->descriptor.bMaxPacketSize0; 7212824bd25SMichael Hund dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL); 7222824bd25SMichael Hund if (!dev->interrupt_out_buffer) { 7232824bd25SMichael Hund dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n"); 7242824bd25SMichael Hund goto error; 7252824bd25SMichael Hund } 7262824bd25SMichael Hund dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 7272d403903SWolfram Sang if (!dev->interrupt_out_urb) 7282824bd25SMichael Hund goto error; 7292824bd25SMichael Hund dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 7302824bd25SMichael Hund if (dev->interrupt_out_endpoint) 7312824bd25SMichael Hund dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 7322824bd25SMichael Hund 7332824bd25SMichael Hund /* we can register the device now, as it is ready */ 7342824bd25SMichael Hund usb_set_intfdata(intf, dev); 7352824bd25SMichael Hund 7362824bd25SMichael Hund retval = usb_register_dev(intf, &ld_usb_class); 7372824bd25SMichael Hund if (retval) { 7382824bd25SMichael Hund /* something prevented us from registering this driver */ 7392824bd25SMichael Hund dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 7402824bd25SMichael Hund usb_set_intfdata(intf, NULL); 7412824bd25SMichael Hund goto error; 7422824bd25SMichael Hund } 7432824bd25SMichael Hund 7442824bd25SMichael Hund /* let the user know what node this device is now attached to */ 7452824bd25SMichael Hund dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n", 7462824bd25SMichael Hund (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor); 7472824bd25SMichael Hund 7482824bd25SMichael Hund exit: 7492824bd25SMichael Hund return retval; 7502824bd25SMichael Hund 7512824bd25SMichael Hund error: 7522824bd25SMichael Hund ld_usb_delete(dev); 7532824bd25SMichael Hund 7542824bd25SMichael Hund return retval; 7552824bd25SMichael Hund } 7562824bd25SMichael Hund 7572824bd25SMichael Hund /** 7582824bd25SMichael Hund * ld_usb_disconnect 7592824bd25SMichael Hund * 7602824bd25SMichael Hund * Called by the usb core when the device is removed from the system. 7612824bd25SMichael Hund */ 7622824bd25SMichael Hund static void ld_usb_disconnect(struct usb_interface *intf) 7632824bd25SMichael Hund { 7642824bd25SMichael Hund struct ld_usb *dev; 7652824bd25SMichael Hund int minor; 7662824bd25SMichael Hund 7672824bd25SMichael Hund dev = usb_get_intfdata(intf); 7682824bd25SMichael Hund usb_set_intfdata(intf, NULL); 7692824bd25SMichael Hund 7702824bd25SMichael Hund minor = intf->minor; 7712824bd25SMichael Hund 7722824bd25SMichael Hund /* give back our minor */ 7732824bd25SMichael Hund usb_deregister_dev(intf, &ld_usb_class); 7742824bd25SMichael Hund 775ce0d7d3fSDaniel Walker mutex_lock(&dev->mutex); 776d4ead16fSAlan Stern 7772824bd25SMichael Hund /* if the device is not opened, then we clean up right now */ 7782824bd25SMichael Hund if (!dev->open_count) { 779ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 7802824bd25SMichael Hund ld_usb_delete(dev); 7812824bd25SMichael Hund } else { 7822824bd25SMichael Hund dev->intf = NULL; 783d12b85e7SOliver Neukum /* wake up pollers */ 784d12b85e7SOliver Neukum wake_up_interruptible_all(&dev->read_wait); 785d12b85e7SOliver Neukum wake_up_interruptible_all(&dev->write_wait); 786ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 7872824bd25SMichael Hund } 7882824bd25SMichael Hund 7892824bd25SMichael Hund dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", 7902824bd25SMichael Hund (minor - USB_LD_MINOR_BASE)); 7912824bd25SMichael Hund } 7922824bd25SMichael Hund 7932824bd25SMichael Hund /* usb specific object needed to register this driver with the usb subsystem */ 7942824bd25SMichael Hund static struct usb_driver ld_usb_driver = { 7952824bd25SMichael Hund .name = "ldusb", 7962824bd25SMichael Hund .probe = ld_usb_probe, 7972824bd25SMichael Hund .disconnect = ld_usb_disconnect, 7982824bd25SMichael Hund .id_table = ld_usb_table, 7992824bd25SMichael Hund }; 8002824bd25SMichael Hund 80165db4305SGreg Kroah-Hartman module_usb_driver(ld_usb_driver); 8022824bd25SMichael Hund 803