15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 22824bd25SMichael Hund /** 32824bd25SMichael Hund * Generic USB driver for report based interrupt in/out devices 42824bd25SMichael Hund * like LD Didactic's USB devices. LD Didactic's USB devices are 52824bd25SMichael Hund * HID devices which do not use HID report definitons (they use 62824bd25SMichael Hund * raw interrupt in and our reports only for communication). 72824bd25SMichael Hund * 82824bd25SMichael Hund * This driver uses a ring buffer for time critical reading of 92824bd25SMichael Hund * interrupt in reports and provides read and write methods for 102824bd25SMichael Hund * raw interrupt reports (similar to the Windows HID driver). 112824bd25SMichael Hund * Devices based on the book USB COMPLETE by Jan Axelson may need 122824bd25SMichael Hund * such a compatibility to the Windows HID driver. 132824bd25SMichael Hund * 142824bd25SMichael Hund * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> 152824bd25SMichael Hund * 162824bd25SMichael Hund * Derived from Lego USB Tower driver 172824bd25SMichael Hund * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> 182824bd25SMichael Hund * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> 192824bd25SMichael Hund */ 202824bd25SMichael Hund 212824bd25SMichael Hund #include <linux/kernel.h> 222824bd25SMichael Hund #include <linux/errno.h> 232824bd25SMichael Hund #include <linux/slab.h> 242824bd25SMichael Hund #include <linux/module.h> 254186ecf8SArjan van de Ven #include <linux/mutex.h> 262824bd25SMichael Hund 277c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 282824bd25SMichael Hund #include <linux/input.h> 292824bd25SMichael Hund #include <linux/usb.h> 302824bd25SMichael Hund #include <linux/poll.h> 312824bd25SMichael Hund 322824bd25SMichael Hund /* Define these values to match your devices */ 332824bd25SMichael Hund #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */ 34ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */ 35ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */ 36ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */ 37ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */ 38ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */ 39ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */ 40ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */ 41ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */ 42ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */ 43ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */ 44ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */ 4552ad2bd8SKarsten Koop #define USB_DEVICE_ID_LD_POWERANALYSERCASSY 0x1040 /* USB Product ID of Power Analyser CASSY */ 4652ad2bd8SKarsten Koop #define USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY 0x1042 /* USB Product ID of Converter Controller CASSY */ 4752ad2bd8SKarsten Koop #define USB_DEVICE_ID_LD_MACHINETESTCASSY 0x1043 /* USB Product ID of Machine Test CASSY */ 48ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */ 49ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */ 50ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */ 51ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */ 52ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */ 53ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */ 54ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */ 55ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/ 56ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */ 57ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */ 58ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */ 59ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */ 60ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */ 61ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */ 62ba3e66e9SMichael Hund #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */ 63ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */ 64ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */ 65ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */ 66ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */ 67ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */ 68ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */ 69ce97cac8SMichael Hund #define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */ 702824bd25SMichael Hund 712824bd25SMichael Hund #ifdef CONFIG_USB_DYNAMIC_MINORS 722824bd25SMichael Hund #define USB_LD_MINOR_BASE 0 732824bd25SMichael Hund #else 742824bd25SMichael Hund #define USB_LD_MINOR_BASE 176 752824bd25SMichael Hund #endif 762824bd25SMichael Hund 772824bd25SMichael Hund /* table of devices that work with this driver */ 7833b9e162SNémeth Márton static const struct usb_device_id ld_usb_table[] = { 79ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) }, 80ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) }, 81ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) }, 82ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) }, 83ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) }, 84ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) }, 85ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) }, 86ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) }, 87ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) }, 88ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) }, 89ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) }, 9052ad2bd8SKarsten Koop { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERANALYSERCASSY) }, 9152ad2bd8SKarsten Koop { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY) }, 9252ad2bd8SKarsten Koop { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETESTCASSY) }, 93ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) }, 94ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) }, 95ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) }, 96ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) }, 97ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) }, 98ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) }, 99ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) }, 100ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) }, 101ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) }, 102ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) }, 103ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) }, 104ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) }, 105ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) }, 106ba3e66e9SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) }, 107ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) }, 108ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) }, 109ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) }, 110ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) }, 111ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) }, 112ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) }, 113ce97cac8SMichael Hund { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) }, 1142824bd25SMichael Hund { } /* Terminating entry */ 1152824bd25SMichael Hund }; 1162824bd25SMichael Hund MODULE_DEVICE_TABLE(usb, ld_usb_table); 1172824bd25SMichael Hund MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); 1182824bd25SMichael Hund MODULE_DESCRIPTION("LD USB Driver"); 1192824bd25SMichael Hund MODULE_LICENSE("GPL"); 1202824bd25SMichael Hund MODULE_SUPPORTED_DEVICE("LD USB Devices"); 1212824bd25SMichael Hund 1222824bd25SMichael Hund /* All interrupt in transfers are collected in a ring buffer to 1232824bd25SMichael Hund * avoid racing conditions and get better performance of the driver. 1242824bd25SMichael Hund */ 1252824bd25SMichael Hund static int ring_buffer_size = 128; 1263d1a4673SMilian Reichardt module_param(ring_buffer_size, int, 0000); 1272824bd25SMichael Hund MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); 1282824bd25SMichael Hund 1292824bd25SMichael Hund /* The write_buffer can contain more than one interrupt out transfer. 1302824bd25SMichael Hund */ 1312824bd25SMichael Hund static int write_buffer_size = 10; 1323d1a4673SMilian Reichardt module_param(write_buffer_size, int, 0000); 1332824bd25SMichael Hund MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); 1342824bd25SMichael Hund 1352824bd25SMichael Hund /* As of kernel version 2.6.4 ehci-hcd uses an 1362824bd25SMichael Hund * "only one interrupt transfer per frame" shortcut 1372824bd25SMichael Hund * to simplify the scheduling of periodic transfers. 1382824bd25SMichael Hund * This conflicts with our standard 1ms intervals for in and out URBs. 1392824bd25SMichael Hund * We use default intervals of 2ms for in and 2ms for out transfers, 1402824bd25SMichael Hund * which should be fast enough. 1412824bd25SMichael Hund * Increase the interval to allow more devices that do interrupt transfers, 1422824bd25SMichael Hund * or set to 1 to use the standard interval from the endpoint descriptors. 1432824bd25SMichael Hund */ 1442824bd25SMichael Hund static int min_interrupt_in_interval = 2; 1453d1a4673SMilian Reichardt module_param(min_interrupt_in_interval, int, 0000); 1462824bd25SMichael Hund MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); 1472824bd25SMichael Hund 1482824bd25SMichael Hund static int min_interrupt_out_interval = 2; 1493d1a4673SMilian Reichardt module_param(min_interrupt_out_interval, int, 0000); 1502824bd25SMichael Hund MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); 1512824bd25SMichael Hund 1522824bd25SMichael Hund /* Structure to hold all of our device specific stuff */ 1532824bd25SMichael Hund struct ld_usb { 154ce0d7d3fSDaniel Walker struct mutex mutex; /* locks this structure */ 1552824bd25SMichael Hund struct usb_interface *intf; /* save off the usb interface pointer */ 1562824bd25SMichael Hund 1572824bd25SMichael Hund int open_count; /* number of times this port has been opened */ 1582824bd25SMichael Hund 1592824bd25SMichael Hund char *ring_buffer; 1602824bd25SMichael Hund unsigned int ring_head; 1612824bd25SMichael Hund unsigned int ring_tail; 1622824bd25SMichael Hund 1632824bd25SMichael Hund wait_queue_head_t read_wait; 1642824bd25SMichael Hund wait_queue_head_t write_wait; 1652824bd25SMichael Hund 1662824bd25SMichael Hund char *interrupt_in_buffer; 1672824bd25SMichael Hund struct usb_endpoint_descriptor *interrupt_in_endpoint; 1682824bd25SMichael Hund struct urb *interrupt_in_urb; 1692824bd25SMichael Hund int interrupt_in_interval; 1702824bd25SMichael Hund size_t interrupt_in_endpoint_size; 1712824bd25SMichael Hund int interrupt_in_running; 1722824bd25SMichael Hund int interrupt_in_done; 1739d33efd9SOliver Neukum int buffer_overflow; 1749d33efd9SOliver Neukum spinlock_t rbsl; 1752824bd25SMichael Hund 1762824bd25SMichael Hund char *interrupt_out_buffer; 1772824bd25SMichael Hund struct usb_endpoint_descriptor *interrupt_out_endpoint; 1782824bd25SMichael Hund struct urb *interrupt_out_urb; 1792824bd25SMichael Hund int interrupt_out_interval; 1802824bd25SMichael Hund size_t interrupt_out_endpoint_size; 1812824bd25SMichael Hund int interrupt_out_busy; 1822824bd25SMichael Hund }; 1832824bd25SMichael Hund 1842824bd25SMichael Hund static struct usb_driver ld_usb_driver; 1852824bd25SMichael Hund 1862824bd25SMichael Hund /** 1872824bd25SMichael Hund * ld_usb_abort_transfers 1882824bd25SMichael Hund * aborts transfers and frees associated data structures 1892824bd25SMichael Hund */ 1902824bd25SMichael Hund static void ld_usb_abort_transfers(struct ld_usb *dev) 1912824bd25SMichael Hund { 1922824bd25SMichael Hund /* shutdown transfer */ 1932824bd25SMichael Hund if (dev->interrupt_in_running) { 1942824bd25SMichael Hund dev->interrupt_in_running = 0; 1952824bd25SMichael Hund if (dev->intf) 1962824bd25SMichael Hund usb_kill_urb(dev->interrupt_in_urb); 1972824bd25SMichael Hund } 1982824bd25SMichael Hund if (dev->interrupt_out_busy) 1992824bd25SMichael Hund if (dev->intf) 2002824bd25SMichael Hund usb_kill_urb(dev->interrupt_out_urb); 2012824bd25SMichael Hund } 2022824bd25SMichael Hund 2032824bd25SMichael Hund /** 2042824bd25SMichael Hund * ld_usb_delete 2052824bd25SMichael Hund */ 2062824bd25SMichael Hund static void ld_usb_delete(struct ld_usb *dev) 2072824bd25SMichael Hund { 2082824bd25SMichael Hund ld_usb_abort_transfers(dev); 2092824bd25SMichael Hund 2102824bd25SMichael Hund /* free data structures */ 2112824bd25SMichael Hund usb_free_urb(dev->interrupt_in_urb); 2122824bd25SMichael Hund usb_free_urb(dev->interrupt_out_urb); 2132824bd25SMichael Hund kfree(dev->ring_buffer); 2142824bd25SMichael Hund kfree(dev->interrupt_in_buffer); 2152824bd25SMichael Hund kfree(dev->interrupt_out_buffer); 2162824bd25SMichael Hund kfree(dev); 2172824bd25SMichael Hund } 2182824bd25SMichael Hund 2192824bd25SMichael Hund /** 2202824bd25SMichael Hund * ld_usb_interrupt_in_callback 2212824bd25SMichael Hund */ 2227d12e780SDavid Howells static void ld_usb_interrupt_in_callback(struct urb *urb) 2232824bd25SMichael Hund { 2242824bd25SMichael Hund struct ld_usb *dev = urb->context; 2252824bd25SMichael Hund size_t *actual_buffer; 2262824bd25SMichael Hund unsigned int next_ring_head; 227491c021eSGreg Kroah-Hartman int status = urb->status; 2282824bd25SMichael Hund int retval; 2292824bd25SMichael Hund 230491c021eSGreg Kroah-Hartman if (status) { 231491c021eSGreg Kroah-Hartman if (status == -ENOENT || 232491c021eSGreg Kroah-Hartman status == -ECONNRESET || 233491c021eSGreg Kroah-Hartman status == -ESHUTDOWN) { 2342824bd25SMichael Hund goto exit; 2352824bd25SMichael Hund } else { 236457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, 237457163c4SGreg Kroah-Hartman "%s: nonzero status received: %d\n", __func__, 238457163c4SGreg Kroah-Hartman status); 2399d33efd9SOliver Neukum spin_lock(&dev->rbsl); 2402824bd25SMichael Hund goto resubmit; /* maybe we can recover */ 2412824bd25SMichael Hund } 2422824bd25SMichael Hund } 2432824bd25SMichael Hund 2449d33efd9SOliver Neukum spin_lock(&dev->rbsl); 2452824bd25SMichael Hund if (urb->actual_length > 0) { 2462824bd25SMichael Hund next_ring_head = (dev->ring_head+1) % ring_buffer_size; 2472824bd25SMichael Hund if (next_ring_head != dev->ring_tail) { 2482824bd25SMichael Hund actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_head * (sizeof(size_t)+dev->interrupt_in_endpoint_size)); 2492824bd25SMichael Hund /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ 2502824bd25SMichael Hund *actual_buffer = urb->actual_length; 2512824bd25SMichael Hund memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); 2522824bd25SMichael Hund dev->ring_head = next_ring_head; 253457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, "%s: received %d bytes\n", 254441b62c1SHarvey Harrison __func__, urb->actual_length); 2559d33efd9SOliver Neukum } else { 2562824bd25SMichael Hund dev_warn(&dev->intf->dev, 2572824bd25SMichael Hund "Ring buffer overflow, %d bytes dropped\n", 2582824bd25SMichael Hund urb->actual_length); 2599d33efd9SOliver Neukum dev->buffer_overflow = 1; 2609d33efd9SOliver Neukum } 2612824bd25SMichael Hund } 2622824bd25SMichael Hund 2632824bd25SMichael Hund resubmit: 2642824bd25SMichael Hund /* resubmit if we're still running */ 2659d33efd9SOliver Neukum if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) { 2662824bd25SMichael Hund retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); 2679d33efd9SOliver Neukum if (retval) { 2682824bd25SMichael Hund dev_err(&dev->intf->dev, 2692824bd25SMichael Hund "usb_submit_urb failed (%d)\n", retval); 2709d33efd9SOliver Neukum dev->buffer_overflow = 1; 2712824bd25SMichael Hund } 2729d33efd9SOliver Neukum } 2739d33efd9SOliver Neukum spin_unlock(&dev->rbsl); 2742824bd25SMichael Hund exit: 2752824bd25SMichael Hund dev->interrupt_in_done = 1; 2762824bd25SMichael Hund wake_up_interruptible(&dev->read_wait); 2772824bd25SMichael Hund } 2782824bd25SMichael Hund 2792824bd25SMichael Hund /** 2802824bd25SMichael Hund * ld_usb_interrupt_out_callback 2812824bd25SMichael Hund */ 2827d12e780SDavid Howells static void ld_usb_interrupt_out_callback(struct urb *urb) 2832824bd25SMichael Hund { 2842824bd25SMichael Hund struct ld_usb *dev = urb->context; 285491c021eSGreg Kroah-Hartman int status = urb->status; 2862824bd25SMichael Hund 2872824bd25SMichael Hund /* sync/async unlink faults aren't errors */ 288491c021eSGreg Kroah-Hartman if (status && !(status == -ENOENT || 289491c021eSGreg Kroah-Hartman status == -ECONNRESET || 290491c021eSGreg Kroah-Hartman status == -ESHUTDOWN)) 291457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, 2922824bd25SMichael Hund "%s - nonzero write interrupt status received: %d\n", 293441b62c1SHarvey Harrison __func__, status); 2942824bd25SMichael Hund 2952824bd25SMichael Hund dev->interrupt_out_busy = 0; 2962824bd25SMichael Hund wake_up_interruptible(&dev->write_wait); 2972824bd25SMichael Hund } 2982824bd25SMichael Hund 2992824bd25SMichael Hund /** 3002824bd25SMichael Hund * ld_usb_open 3012824bd25SMichael Hund */ 3022824bd25SMichael Hund static int ld_usb_open(struct inode *inode, struct file *file) 3032824bd25SMichael Hund { 3042824bd25SMichael Hund struct ld_usb *dev; 3052824bd25SMichael Hund int subminor; 306d4ead16fSAlan Stern int retval; 3072824bd25SMichael Hund struct usb_interface *interface; 3082824bd25SMichael Hund 3092824bd25SMichael Hund nonseekable_open(inode, file); 3102824bd25SMichael Hund subminor = iminor(inode); 3112824bd25SMichael Hund 3122824bd25SMichael Hund interface = usb_find_interface(&ld_usb_driver, subminor); 3132824bd25SMichael Hund 3142824bd25SMichael Hund if (!interface) { 315b22862e5SGreg Kroah-Hartman printk(KERN_ERR "%s - error, can't find device for minor %d\n", 316441b62c1SHarvey Harrison __func__, subminor); 317d4ead16fSAlan Stern return -ENODEV; 3182824bd25SMichael Hund } 3192824bd25SMichael Hund 3202824bd25SMichael Hund dev = usb_get_intfdata(interface); 3212824bd25SMichael Hund 3226248c52fSOliver Neukum if (!dev) 323d4ead16fSAlan Stern return -ENODEV; 3242824bd25SMichael Hund 3252824bd25SMichael Hund /* lock this device */ 3266248c52fSOliver Neukum if (mutex_lock_interruptible(&dev->mutex)) 327d4ead16fSAlan Stern return -ERESTARTSYS; 3282824bd25SMichael Hund 3292824bd25SMichael Hund /* allow opening only once */ 3302824bd25SMichael Hund if (dev->open_count) { 3312824bd25SMichael Hund retval = -EBUSY; 3322824bd25SMichael Hund goto unlock_exit; 3332824bd25SMichael Hund } 3342824bd25SMichael Hund dev->open_count = 1; 3352824bd25SMichael Hund 3362824bd25SMichael Hund /* initialize in direction */ 3372824bd25SMichael Hund dev->ring_head = 0; 3382824bd25SMichael Hund dev->ring_tail = 0; 3399d33efd9SOliver Neukum dev->buffer_overflow = 0; 3402824bd25SMichael Hund usb_fill_int_urb(dev->interrupt_in_urb, 3412824bd25SMichael Hund interface_to_usbdev(interface), 3422824bd25SMichael Hund usb_rcvintpipe(interface_to_usbdev(interface), 3432824bd25SMichael Hund dev->interrupt_in_endpoint->bEndpointAddress), 3442824bd25SMichael Hund dev->interrupt_in_buffer, 3452824bd25SMichael Hund dev->interrupt_in_endpoint_size, 3462824bd25SMichael Hund ld_usb_interrupt_in_callback, 3472824bd25SMichael Hund dev, 3482824bd25SMichael Hund dev->interrupt_in_interval); 3492824bd25SMichael Hund 3502824bd25SMichael Hund dev->interrupt_in_running = 1; 3512824bd25SMichael Hund dev->interrupt_in_done = 0; 3522824bd25SMichael Hund 3532824bd25SMichael Hund retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 3542824bd25SMichael Hund if (retval) { 3552824bd25SMichael Hund dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); 3562824bd25SMichael Hund dev->interrupt_in_running = 0; 3572824bd25SMichael Hund dev->open_count = 0; 3582824bd25SMichael Hund goto unlock_exit; 3592824bd25SMichael Hund } 3602824bd25SMichael Hund 3612824bd25SMichael Hund /* save device in the file's private structure */ 3622824bd25SMichael Hund file->private_data = dev; 3632824bd25SMichael Hund 3642824bd25SMichael Hund unlock_exit: 365ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 3662824bd25SMichael Hund 3672824bd25SMichael Hund return retval; 3682824bd25SMichael Hund } 3692824bd25SMichael Hund 3702824bd25SMichael Hund /** 3712824bd25SMichael Hund * ld_usb_release 3722824bd25SMichael Hund */ 3732824bd25SMichael Hund static int ld_usb_release(struct inode *inode, struct file *file) 3742824bd25SMichael Hund { 3752824bd25SMichael Hund struct ld_usb *dev; 3762824bd25SMichael Hund int retval = 0; 3772824bd25SMichael Hund 3782824bd25SMichael Hund dev = file->private_data; 3792824bd25SMichael Hund 3802824bd25SMichael Hund if (dev == NULL) { 3812824bd25SMichael Hund retval = -ENODEV; 3822824bd25SMichael Hund goto exit; 3832824bd25SMichael Hund } 3842824bd25SMichael Hund 385ce0d7d3fSDaniel Walker if (mutex_lock_interruptible(&dev->mutex)) { 3862824bd25SMichael Hund retval = -ERESTARTSYS; 3872824bd25SMichael Hund goto exit; 3882824bd25SMichael Hund } 3892824bd25SMichael Hund 3902824bd25SMichael Hund if (dev->open_count != 1) { 3912824bd25SMichael Hund retval = -ENODEV; 3922824bd25SMichael Hund goto unlock_exit; 3932824bd25SMichael Hund } 3942824bd25SMichael Hund if (dev->intf == NULL) { 3952824bd25SMichael Hund /* the device was unplugged before the file was released */ 396ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 3972824bd25SMichael Hund /* unlock here as ld_usb_delete frees dev */ 3982824bd25SMichael Hund ld_usb_delete(dev); 3992824bd25SMichael Hund goto exit; 4002824bd25SMichael Hund } 4012824bd25SMichael Hund 4022824bd25SMichael Hund /* wait until write transfer is finished */ 4032824bd25SMichael Hund if (dev->interrupt_out_busy) 4042824bd25SMichael Hund wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); 4052824bd25SMichael Hund ld_usb_abort_transfers(dev); 4062824bd25SMichael Hund dev->open_count = 0; 4072824bd25SMichael Hund 4082824bd25SMichael Hund unlock_exit: 409ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 4102824bd25SMichael Hund 4112824bd25SMichael Hund exit: 4122824bd25SMichael Hund return retval; 4132824bd25SMichael Hund } 4142824bd25SMichael Hund 4152824bd25SMichael Hund /** 4162824bd25SMichael Hund * ld_usb_poll 4172824bd25SMichael Hund */ 418afc9a42bSAl Viro static __poll_t ld_usb_poll(struct file *file, poll_table *wait) 4192824bd25SMichael Hund { 4202824bd25SMichael Hund struct ld_usb *dev; 421afc9a42bSAl Viro __poll_t mask = 0; 4222824bd25SMichael Hund 4232824bd25SMichael Hund dev = file->private_data; 4242824bd25SMichael Hund 425d12b85e7SOliver Neukum if (!dev->intf) 426a9a08845SLinus Torvalds return EPOLLERR | EPOLLHUP; 427d12b85e7SOliver Neukum 4282824bd25SMichael Hund poll_wait(file, &dev->read_wait, wait); 4292824bd25SMichael Hund poll_wait(file, &dev->write_wait, wait); 4302824bd25SMichael Hund 4312824bd25SMichael Hund if (dev->ring_head != dev->ring_tail) 432a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; 4332824bd25SMichael Hund if (!dev->interrupt_out_busy) 434a9a08845SLinus Torvalds mask |= EPOLLOUT | EPOLLWRNORM; 4352824bd25SMichael Hund 4362824bd25SMichael Hund return mask; 4372824bd25SMichael Hund } 4382824bd25SMichael Hund 4392824bd25SMichael Hund /** 4402824bd25SMichael Hund * ld_usb_read 4412824bd25SMichael Hund */ 4422824bd25SMichael Hund static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, 4432824bd25SMichael Hund loff_t *ppos) 4442824bd25SMichael Hund { 4452824bd25SMichael Hund struct ld_usb *dev; 4462824bd25SMichael Hund size_t *actual_buffer; 4472824bd25SMichael Hund size_t bytes_to_read; 4482824bd25SMichael Hund int retval = 0; 4499d33efd9SOliver Neukum int rv; 4502824bd25SMichael Hund 4512824bd25SMichael Hund dev = file->private_data; 4522824bd25SMichael Hund 4532824bd25SMichael Hund /* verify that we actually have some data to read */ 4542824bd25SMichael Hund if (count == 0) 4552824bd25SMichael Hund goto exit; 4562824bd25SMichael Hund 4572824bd25SMichael Hund /* lock this object */ 458ce0d7d3fSDaniel Walker if (mutex_lock_interruptible(&dev->mutex)) { 4592824bd25SMichael Hund retval = -ERESTARTSYS; 4602824bd25SMichael Hund goto exit; 4612824bd25SMichael Hund } 4622824bd25SMichael Hund 4632824bd25SMichael Hund /* verify that the device wasn't unplugged */ 4642824bd25SMichael Hund if (dev->intf == NULL) { 4652824bd25SMichael Hund retval = -ENODEV; 466b22862e5SGreg Kroah-Hartman printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); 4672824bd25SMichael Hund goto unlock_exit; 4682824bd25SMichael Hund } 4692824bd25SMichael Hund 4702824bd25SMichael Hund /* wait for data */ 4719d33efd9SOliver Neukum spin_lock_irq(&dev->rbsl); 4722824bd25SMichael Hund if (dev->ring_head == dev->ring_tail) { 4739d33efd9SOliver Neukum dev->interrupt_in_done = 0; 4749d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 4752824bd25SMichael Hund if (file->f_flags & O_NONBLOCK) { 4762824bd25SMichael Hund retval = -EAGAIN; 4772824bd25SMichael Hund goto unlock_exit; 4782824bd25SMichael Hund } 4792824bd25SMichael Hund retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); 4802824bd25SMichael Hund if (retval < 0) 4812824bd25SMichael Hund goto unlock_exit; 4829d33efd9SOliver Neukum } else { 4839d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 4842824bd25SMichael Hund } 4852824bd25SMichael Hund 4862824bd25SMichael Hund /* actual_buffer contains actual_length + interrupt_in_buffer */ 4872824bd25SMichael Hund actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_tail * (sizeof(size_t)+dev->interrupt_in_endpoint_size)); 4882824bd25SMichael Hund bytes_to_read = min(count, *actual_buffer); 4892824bd25SMichael Hund if (bytes_to_read < *actual_buffer) 490dd7d5008SAlexey Dobriyan dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n", 4912824bd25SMichael Hund *actual_buffer-bytes_to_read); 4922824bd25SMichael Hund 4932824bd25SMichael Hund /* copy one interrupt_in_buffer from ring_buffer into userspace */ 4942824bd25SMichael Hund if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { 4952824bd25SMichael Hund retval = -EFAULT; 4962824bd25SMichael Hund goto unlock_exit; 4972824bd25SMichael Hund } 4982824bd25SMichael Hund dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; 4992824bd25SMichael Hund 5002824bd25SMichael Hund retval = bytes_to_read; 5012824bd25SMichael Hund 5029d33efd9SOliver Neukum spin_lock_irq(&dev->rbsl); 5039d33efd9SOliver Neukum if (dev->buffer_overflow) { 5049d33efd9SOliver Neukum dev->buffer_overflow = 0; 5059d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 5069d33efd9SOliver Neukum rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); 5079d33efd9SOliver Neukum if (rv < 0) 5089d33efd9SOliver Neukum dev->buffer_overflow = 1; 5099d33efd9SOliver Neukum } else { 5109d33efd9SOliver Neukum spin_unlock_irq(&dev->rbsl); 5119d33efd9SOliver Neukum } 5129d33efd9SOliver Neukum 5132824bd25SMichael Hund unlock_exit: 5142824bd25SMichael Hund /* unlock the device */ 515ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 5162824bd25SMichael Hund 5172824bd25SMichael Hund exit: 5182824bd25SMichael Hund return retval; 5192824bd25SMichael Hund } 5202824bd25SMichael Hund 5212824bd25SMichael Hund /** 5222824bd25SMichael Hund * ld_usb_write 5232824bd25SMichael Hund */ 5242824bd25SMichael Hund static ssize_t ld_usb_write(struct file *file, const char __user *buffer, 5252824bd25SMichael Hund size_t count, loff_t *ppos) 5262824bd25SMichael Hund { 5272824bd25SMichael Hund struct ld_usb *dev; 5282824bd25SMichael Hund size_t bytes_to_write; 5292824bd25SMichael Hund int retval = 0; 5302824bd25SMichael Hund 5312824bd25SMichael Hund dev = file->private_data; 5322824bd25SMichael Hund 5332824bd25SMichael Hund /* verify that we actually have some data to write */ 5342824bd25SMichael Hund if (count == 0) 5352824bd25SMichael Hund goto exit; 5362824bd25SMichael Hund 5372824bd25SMichael Hund /* lock this object */ 538ce0d7d3fSDaniel Walker if (mutex_lock_interruptible(&dev->mutex)) { 5392824bd25SMichael Hund retval = -ERESTARTSYS; 5402824bd25SMichael Hund goto exit; 5412824bd25SMichael Hund } 5422824bd25SMichael Hund 5432824bd25SMichael Hund /* verify that the device wasn't unplugged */ 5442824bd25SMichael Hund if (dev->intf == NULL) { 5452824bd25SMichael Hund retval = -ENODEV; 546b22862e5SGreg Kroah-Hartman printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); 5472824bd25SMichael Hund goto unlock_exit; 5482824bd25SMichael Hund } 5492824bd25SMichael Hund 5502824bd25SMichael Hund /* wait until previous transfer is finished */ 5512824bd25SMichael Hund if (dev->interrupt_out_busy) { 5522824bd25SMichael Hund if (file->f_flags & O_NONBLOCK) { 5532824bd25SMichael Hund retval = -EAGAIN; 5542824bd25SMichael Hund goto unlock_exit; 5552824bd25SMichael Hund } 5562824bd25SMichael Hund retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); 5572824bd25SMichael Hund if (retval < 0) { 5582824bd25SMichael Hund goto unlock_exit; 5592824bd25SMichael Hund } 5602824bd25SMichael Hund } 5612824bd25SMichael Hund 5622824bd25SMichael Hund /* write the data into interrupt_out_buffer from userspace */ 5632824bd25SMichael Hund bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); 5642824bd25SMichael Hund if (bytes_to_write < count) 565dd7d5008SAlexey Dobriyan dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n", count-bytes_to_write); 566457163c4SGreg Kroah-Hartman dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", 567457163c4SGreg Kroah-Hartman __func__, count, bytes_to_write); 5682824bd25SMichael Hund 5692824bd25SMichael Hund if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { 5702824bd25SMichael Hund retval = -EFAULT; 5712824bd25SMichael Hund goto unlock_exit; 5722824bd25SMichael Hund } 5732824bd25SMichael Hund 5742824bd25SMichael Hund if (dev->interrupt_out_endpoint == NULL) { 5752824bd25SMichael Hund /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ 5762824bd25SMichael Hund retval = usb_control_msg(interface_to_usbdev(dev->intf), 5772824bd25SMichael Hund usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), 5782824bd25SMichael Hund 9, 5792824bd25SMichael Hund USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, 5802824bd25SMichael Hund 1 << 8, 0, 5812824bd25SMichael Hund dev->interrupt_out_buffer, 5822824bd25SMichael Hund bytes_to_write, 5832824bd25SMichael Hund USB_CTRL_SET_TIMEOUT * HZ); 5842824bd25SMichael Hund if (retval < 0) 585b22862e5SGreg Kroah-Hartman dev_err(&dev->intf->dev, 586b22862e5SGreg Kroah-Hartman "Couldn't submit HID_REQ_SET_REPORT %d\n", 587b22862e5SGreg Kroah-Hartman retval); 5882824bd25SMichael Hund goto unlock_exit; 5892824bd25SMichael Hund } 5902824bd25SMichael Hund 5912824bd25SMichael Hund /* send off the urb */ 5922824bd25SMichael Hund usb_fill_int_urb(dev->interrupt_out_urb, 5932824bd25SMichael Hund interface_to_usbdev(dev->intf), 5942824bd25SMichael Hund usb_sndintpipe(interface_to_usbdev(dev->intf), 5952824bd25SMichael Hund dev->interrupt_out_endpoint->bEndpointAddress), 5962824bd25SMichael Hund dev->interrupt_out_buffer, 5972824bd25SMichael Hund bytes_to_write, 5982824bd25SMichael Hund ld_usb_interrupt_out_callback, 5992824bd25SMichael Hund dev, 6002824bd25SMichael Hund dev->interrupt_out_interval); 6012824bd25SMichael Hund 6022824bd25SMichael Hund dev->interrupt_out_busy = 1; 6032824bd25SMichael Hund wmb(); 6042824bd25SMichael Hund 6052824bd25SMichael Hund retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); 6062824bd25SMichael Hund if (retval) { 6072824bd25SMichael Hund dev->interrupt_out_busy = 0; 608b22862e5SGreg Kroah-Hartman dev_err(&dev->intf->dev, 609b22862e5SGreg Kroah-Hartman "Couldn't submit interrupt_out_urb %d\n", retval); 6102824bd25SMichael Hund goto unlock_exit; 6112824bd25SMichael Hund } 6122824bd25SMichael Hund retval = bytes_to_write; 6132824bd25SMichael Hund 6142824bd25SMichael Hund unlock_exit: 6152824bd25SMichael Hund /* unlock the device */ 616ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 6172824bd25SMichael Hund 6182824bd25SMichael Hund exit: 6192824bd25SMichael Hund return retval; 6202824bd25SMichael Hund } 6212824bd25SMichael Hund 6222824bd25SMichael Hund /* file operations needed when we register this driver */ 623066202ddSLuiz Fernando N. Capitulino static const struct file_operations ld_usb_fops = { 6242824bd25SMichael Hund .owner = THIS_MODULE, 6252824bd25SMichael Hund .read = ld_usb_read, 6262824bd25SMichael Hund .write = ld_usb_write, 6272824bd25SMichael Hund .open = ld_usb_open, 6282824bd25SMichael Hund .release = ld_usb_release, 6292824bd25SMichael Hund .poll = ld_usb_poll, 6306038f373SArnd Bergmann .llseek = no_llseek, 6312824bd25SMichael Hund }; 6322824bd25SMichael Hund 6332824bd25SMichael Hund /* 6342824bd25SMichael Hund * usb class driver info in order to get a minor number from the usb core, 635595b14cbSGreg Kroah-Hartman * and to have the device registered with the driver core 6362824bd25SMichael Hund */ 6372824bd25SMichael Hund static struct usb_class_driver ld_usb_class = { 6382824bd25SMichael Hund .name = "ldusb%d", 6392824bd25SMichael Hund .fops = &ld_usb_fops, 6402824bd25SMichael Hund .minor_base = USB_LD_MINOR_BASE, 6412824bd25SMichael Hund }; 6422824bd25SMichael Hund 6432824bd25SMichael Hund /** 6442824bd25SMichael Hund * ld_usb_probe 6452824bd25SMichael Hund * 6462824bd25SMichael Hund * Called by the usb core when a new device is connected that it thinks 6472824bd25SMichael Hund * this driver might be interested in. 6482824bd25SMichael Hund */ 6492824bd25SMichael Hund static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) 6502824bd25SMichael Hund { 6512824bd25SMichael Hund struct usb_device *udev = interface_to_usbdev(intf); 6522824bd25SMichael Hund struct ld_usb *dev = NULL; 6532824bd25SMichael Hund struct usb_host_interface *iface_desc; 6542824bd25SMichael Hund char *buffer; 6552824bd25SMichael Hund int retval = -ENOMEM; 6562707ca16SJohan Hovold int res; 6572824bd25SMichael Hund 658b595076aSUwe Kleine-König /* allocate memory for our device state and initialize it */ 6592824bd25SMichael Hund 6601144cf7aSOliver Neukum dev = kzalloc(sizeof(*dev), GFP_KERNEL); 6616714ffaeSWolfram Sang if (!dev) 6622824bd25SMichael Hund goto exit; 663ce0d7d3fSDaniel Walker mutex_init(&dev->mutex); 6649d33efd9SOliver Neukum spin_lock_init(&dev->rbsl); 6652824bd25SMichael Hund dev->intf = intf; 6662824bd25SMichael Hund init_waitqueue_head(&dev->read_wait); 6672824bd25SMichael Hund init_waitqueue_head(&dev->write_wait); 6682824bd25SMichael Hund 6692824bd25SMichael Hund /* workaround for early firmware versions on fast computers */ 6702824bd25SMichael Hund if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && 671ba3e66e9SMichael Hund ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) || 672ba3e66e9SMichael Hund (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) && 6732824bd25SMichael Hund (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { 6742824bd25SMichael Hund buffer = kmalloc(256, GFP_KERNEL); 6756714ffaeSWolfram Sang if (!buffer) 676a6db592eSMichael Hund goto error; 6772824bd25SMichael Hund /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ 6782824bd25SMichael Hund usb_string(udev, 255, buffer, 256); 6792824bd25SMichael Hund kfree(buffer); 6802824bd25SMichael Hund } 6812824bd25SMichael Hund 6822824bd25SMichael Hund iface_desc = intf->cur_altsetting; 6832824bd25SMichael Hund 6842707ca16SJohan Hovold res = usb_find_last_int_in_endpoint(iface_desc, 6852707ca16SJohan Hovold &dev->interrupt_in_endpoint); 6862707ca16SJohan Hovold if (res) { 6872824bd25SMichael Hund dev_err(&intf->dev, "Interrupt in endpoint not found\n"); 6882707ca16SJohan Hovold retval = res; 6892824bd25SMichael Hund goto error; 6902824bd25SMichael Hund } 6912707ca16SJohan Hovold 6922707ca16SJohan Hovold res = usb_find_last_int_out_endpoint(iface_desc, 6932707ca16SJohan Hovold &dev->interrupt_out_endpoint); 6942707ca16SJohan Hovold if (res) 6952824bd25SMichael Hund dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); 6962824bd25SMichael Hund 69729cc8897SKuninori Morimoto dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); 6986da2ec56SKees Cook dev->ring_buffer = 6996da2ec56SKees Cook kmalloc_array(ring_buffer_size, 7006da2ec56SKees Cook sizeof(size_t) + dev->interrupt_in_endpoint_size, 7016da2ec56SKees Cook GFP_KERNEL); 7026714ffaeSWolfram Sang if (!dev->ring_buffer) 7032824bd25SMichael Hund goto error; 7042824bd25SMichael Hund dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); 7056714ffaeSWolfram Sang if (!dev->interrupt_in_buffer) 7062824bd25SMichael Hund goto error; 7072824bd25SMichael Hund dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); 7082d403903SWolfram Sang if (!dev->interrupt_in_urb) 7092824bd25SMichael Hund goto error; 71029cc8897SKuninori Morimoto dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) : 7112824bd25SMichael Hund udev->descriptor.bMaxPacketSize0; 7126da2ec56SKees Cook dev->interrupt_out_buffer = 7136da2ec56SKees Cook kmalloc_array(write_buffer_size, 7146da2ec56SKees Cook dev->interrupt_out_endpoint_size, GFP_KERNEL); 7156714ffaeSWolfram Sang if (!dev->interrupt_out_buffer) 7162824bd25SMichael Hund goto error; 7172824bd25SMichael Hund dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); 7182d403903SWolfram Sang if (!dev->interrupt_out_urb) 7192824bd25SMichael Hund goto error; 7202824bd25SMichael Hund dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; 7212824bd25SMichael Hund if (dev->interrupt_out_endpoint) 7222824bd25SMichael Hund dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; 7232824bd25SMichael Hund 7242824bd25SMichael Hund /* we can register the device now, as it is ready */ 7252824bd25SMichael Hund usb_set_intfdata(intf, dev); 7262824bd25SMichael Hund 7272824bd25SMichael Hund retval = usb_register_dev(intf, &ld_usb_class); 7282824bd25SMichael Hund if (retval) { 7292824bd25SMichael Hund /* something prevented us from registering this driver */ 7302824bd25SMichael Hund dev_err(&intf->dev, "Not able to get a minor for this device.\n"); 7312824bd25SMichael Hund usb_set_intfdata(intf, NULL); 7322824bd25SMichael Hund goto error; 7332824bd25SMichael Hund } 7342824bd25SMichael Hund 7352824bd25SMichael Hund /* let the user know what node this device is now attached to */ 7362824bd25SMichael Hund dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n", 7372824bd25SMichael Hund (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor); 7382824bd25SMichael Hund 7392824bd25SMichael Hund exit: 7402824bd25SMichael Hund return retval; 7412824bd25SMichael Hund 7422824bd25SMichael Hund error: 7432824bd25SMichael Hund ld_usb_delete(dev); 7442824bd25SMichael Hund 7452824bd25SMichael Hund return retval; 7462824bd25SMichael Hund } 7472824bd25SMichael Hund 7482824bd25SMichael Hund /** 7492824bd25SMichael Hund * ld_usb_disconnect 7502824bd25SMichael Hund * 7512824bd25SMichael Hund * Called by the usb core when the device is removed from the system. 7522824bd25SMichael Hund */ 7532824bd25SMichael Hund static void ld_usb_disconnect(struct usb_interface *intf) 7542824bd25SMichael Hund { 7552824bd25SMichael Hund struct ld_usb *dev; 7562824bd25SMichael Hund int minor; 7572824bd25SMichael Hund 7582824bd25SMichael Hund dev = usb_get_intfdata(intf); 7592824bd25SMichael Hund usb_set_intfdata(intf, NULL); 7602824bd25SMichael Hund 7612824bd25SMichael Hund minor = intf->minor; 7622824bd25SMichael Hund 7632824bd25SMichael Hund /* give back our minor */ 7642824bd25SMichael Hund usb_deregister_dev(intf, &ld_usb_class); 7652824bd25SMichael Hund 766ce0d7d3fSDaniel Walker mutex_lock(&dev->mutex); 767d4ead16fSAlan Stern 7682824bd25SMichael Hund /* if the device is not opened, then we clean up right now */ 7692824bd25SMichael Hund if (!dev->open_count) { 770ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 7712824bd25SMichael Hund ld_usb_delete(dev); 7722824bd25SMichael Hund } else { 7732824bd25SMichael Hund dev->intf = NULL; 774d12b85e7SOliver Neukum /* wake up pollers */ 775d12b85e7SOliver Neukum wake_up_interruptible_all(&dev->read_wait); 776d12b85e7SOliver Neukum wake_up_interruptible_all(&dev->write_wait); 777ce0d7d3fSDaniel Walker mutex_unlock(&dev->mutex); 7782824bd25SMichael Hund } 7792824bd25SMichael Hund 7802824bd25SMichael Hund dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", 7812824bd25SMichael Hund (minor - USB_LD_MINOR_BASE)); 7822824bd25SMichael Hund } 7832824bd25SMichael Hund 7842824bd25SMichael Hund /* usb specific object needed to register this driver with the usb subsystem */ 7852824bd25SMichael Hund static struct usb_driver ld_usb_driver = { 7862824bd25SMichael Hund .name = "ldusb", 7872824bd25SMichael Hund .probe = ld_usb_probe, 7882824bd25SMichael Hund .disconnect = ld_usb_disconnect, 7892824bd25SMichael Hund .id_table = ld_usb_table, 7902824bd25SMichael Hund }; 7912824bd25SMichael Hund 79265db4305SGreg Kroah-Hartman module_usb_driver(ld_usb_driver); 7932824bd25SMichael Hund 794