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457163c4c7
We want to get rid of CONFIG_USB_DEBUG, so remove the reliance of the ldusb driver on it. Don't use the custom macro, or a special module parameter, instead, rely on the in-kernel dynamic debugging infrastructure, which is much easier to use, and consistant across the whole kernel. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
818 lines
25 KiB
C
818 lines
25 KiB
C
/**
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* Generic USB driver for report based interrupt in/out devices
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* like LD Didactic's USB devices. LD Didactic's USB devices are
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* HID devices which do not use HID report definitons (they use
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* raw interrupt in and our reports only for communication).
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*
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* This driver uses a ring buffer for time critical reading of
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* interrupt in reports and provides read and write methods for
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* raw interrupt reports (similar to the Windows HID driver).
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* Devices based on the book USB COMPLETE by Jan Axelson may need
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* such a compatibility to the Windows HID driver.
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*
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* Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* Derived from Lego USB Tower driver
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* Copyright (C) 2003 David Glance <advidgsf@sourceforge.net>
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* 2001-2004 Juergen Stuber <starblue@users.sourceforge.net>
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
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#include <linux/input.h>
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#include <linux/usb.h>
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#include <linux/poll.h>
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/* Define these values to match your devices */
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#define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */
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#define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */
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#define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */
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#define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */
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#define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */
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#define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */
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#define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */
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#define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */
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#define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */
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#define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */
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#define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */
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#define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */
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#define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */
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#define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */
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#define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */
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#define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */
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#define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */
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#define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */
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#define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */
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#define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/
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#define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */
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#define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */
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#define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */
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#define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */
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#define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */
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#define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */
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#define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */
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#define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */
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#define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */
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#define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */
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#define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */
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#define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */
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#define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */
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#define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */
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#define USB_VENDOR_ID_VERNIER 0x08f7
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#define USB_DEVICE_ID_VERNIER_GOTEMP 0x0002
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#define USB_DEVICE_ID_VERNIER_SKIP 0x0003
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#define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004
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#define USB_DEVICE_ID_VERNIER_LCSPEC 0x0006
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#ifdef CONFIG_USB_DYNAMIC_MINORS
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#define USB_LD_MINOR_BASE 0
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#else
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#define USB_LD_MINOR_BASE 176
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#endif
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/* table of devices that work with this driver */
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static const struct usb_device_id ld_usb_table[] = {
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) },
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) },
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{ USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_GOTEMP) },
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{ USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
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{ USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
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{ USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LCSPEC) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, ld_usb_table);
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MODULE_VERSION("V0.14");
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MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>");
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MODULE_DESCRIPTION("LD USB Driver");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("LD USB Devices");
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/* All interrupt in transfers are collected in a ring buffer to
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* avoid racing conditions and get better performance of the driver.
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*/
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static int ring_buffer_size = 128;
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module_param(ring_buffer_size, int, 0);
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MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports");
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/* The write_buffer can contain more than one interrupt out transfer.
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*/
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static int write_buffer_size = 10;
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module_param(write_buffer_size, int, 0);
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MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports");
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/* As of kernel version 2.6.4 ehci-hcd uses an
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* "only one interrupt transfer per frame" shortcut
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* to simplify the scheduling of periodic transfers.
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* This conflicts with our standard 1ms intervals for in and out URBs.
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* We use default intervals of 2ms for in and 2ms for out transfers,
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* which should be fast enough.
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* Increase the interval to allow more devices that do interrupt transfers,
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* or set to 1 to use the standard interval from the endpoint descriptors.
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*/
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static int min_interrupt_in_interval = 2;
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module_param(min_interrupt_in_interval, int, 0);
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MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms");
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static int min_interrupt_out_interval = 2;
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module_param(min_interrupt_out_interval, int, 0);
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MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms");
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/* Structure to hold all of our device specific stuff */
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struct ld_usb {
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struct mutex mutex; /* locks this structure */
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struct usb_interface* intf; /* save off the usb interface pointer */
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int open_count; /* number of times this port has been opened */
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char* ring_buffer;
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unsigned int ring_head;
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unsigned int ring_tail;
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wait_queue_head_t read_wait;
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wait_queue_head_t write_wait;
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char* interrupt_in_buffer;
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struct usb_endpoint_descriptor* interrupt_in_endpoint;
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struct urb* interrupt_in_urb;
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int interrupt_in_interval;
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size_t interrupt_in_endpoint_size;
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int interrupt_in_running;
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int interrupt_in_done;
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int buffer_overflow;
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spinlock_t rbsl;
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char* interrupt_out_buffer;
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struct usb_endpoint_descriptor* interrupt_out_endpoint;
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struct urb* interrupt_out_urb;
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int interrupt_out_interval;
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size_t interrupt_out_endpoint_size;
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int interrupt_out_busy;
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};
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static struct usb_driver ld_usb_driver;
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/**
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* ld_usb_abort_transfers
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* aborts transfers and frees associated data structures
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*/
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static void ld_usb_abort_transfers(struct ld_usb *dev)
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{
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/* shutdown transfer */
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if (dev->interrupt_in_running) {
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dev->interrupt_in_running = 0;
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if (dev->intf)
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usb_kill_urb(dev->interrupt_in_urb);
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}
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if (dev->interrupt_out_busy)
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if (dev->intf)
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usb_kill_urb(dev->interrupt_out_urb);
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}
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/**
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* ld_usb_delete
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*/
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static void ld_usb_delete(struct ld_usb *dev)
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{
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ld_usb_abort_transfers(dev);
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/* free data structures */
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usb_free_urb(dev->interrupt_in_urb);
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usb_free_urb(dev->interrupt_out_urb);
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kfree(dev->ring_buffer);
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kfree(dev->interrupt_in_buffer);
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kfree(dev->interrupt_out_buffer);
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kfree(dev);
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}
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/**
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* ld_usb_interrupt_in_callback
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*/
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static void ld_usb_interrupt_in_callback(struct urb *urb)
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{
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struct ld_usb *dev = urb->context;
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size_t *actual_buffer;
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unsigned int next_ring_head;
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int status = urb->status;
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int retval;
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if (status) {
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if (status == -ENOENT ||
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status == -ECONNRESET ||
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status == -ESHUTDOWN) {
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goto exit;
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} else {
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dev_dbg(&dev->intf->dev,
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"%s: nonzero status received: %d\n", __func__,
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status);
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spin_lock(&dev->rbsl);
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goto resubmit; /* maybe we can recover */
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}
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}
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spin_lock(&dev->rbsl);
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if (urb->actual_length > 0) {
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next_ring_head = (dev->ring_head+1) % ring_buffer_size;
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if (next_ring_head != dev->ring_tail) {
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actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_head*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
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/* actual_buffer gets urb->actual_length + interrupt_in_buffer */
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*actual_buffer = urb->actual_length;
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memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length);
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dev->ring_head = next_ring_head;
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dev_dbg(&dev->intf->dev, "%s: received %d bytes\n",
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__func__, urb->actual_length);
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} else {
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dev_warn(&dev->intf->dev,
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"Ring buffer overflow, %d bytes dropped\n",
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urb->actual_length);
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dev->buffer_overflow = 1;
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}
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}
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resubmit:
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/* resubmit if we're still running */
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if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) {
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retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC);
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if (retval) {
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dev_err(&dev->intf->dev,
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"usb_submit_urb failed (%d)\n", retval);
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dev->buffer_overflow = 1;
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}
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}
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spin_unlock(&dev->rbsl);
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exit:
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dev->interrupt_in_done = 1;
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wake_up_interruptible(&dev->read_wait);
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}
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/**
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* ld_usb_interrupt_out_callback
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*/
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static void ld_usb_interrupt_out_callback(struct urb *urb)
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{
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struct ld_usb *dev = urb->context;
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int status = urb->status;
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/* sync/async unlink faults aren't errors */
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if (status && !(status == -ENOENT ||
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status == -ECONNRESET ||
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status == -ESHUTDOWN))
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dev_dbg(&dev->intf->dev,
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"%s - nonzero write interrupt status received: %d\n",
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__func__, status);
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dev->interrupt_out_busy = 0;
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wake_up_interruptible(&dev->write_wait);
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}
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/**
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* ld_usb_open
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*/
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static int ld_usb_open(struct inode *inode, struct file *file)
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{
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struct ld_usb *dev;
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int subminor;
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int retval;
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struct usb_interface *interface;
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nonseekable_open(inode, file);
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subminor = iminor(inode);
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interface = usb_find_interface(&ld_usb_driver, subminor);
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if (!interface) {
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printk(KERN_ERR "%s - error, can't find device for minor %d\n",
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__func__, subminor);
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return -ENODEV;
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}
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dev = usb_get_intfdata(interface);
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if (!dev)
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return -ENODEV;
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/* lock this device */
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if (mutex_lock_interruptible(&dev->mutex))
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return -ERESTARTSYS;
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/* allow opening only once */
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if (dev->open_count) {
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retval = -EBUSY;
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goto unlock_exit;
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}
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dev->open_count = 1;
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/* initialize in direction */
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dev->ring_head = 0;
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dev->ring_tail = 0;
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dev->buffer_overflow = 0;
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usb_fill_int_urb(dev->interrupt_in_urb,
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interface_to_usbdev(interface),
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usb_rcvintpipe(interface_to_usbdev(interface),
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dev->interrupt_in_endpoint->bEndpointAddress),
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dev->interrupt_in_buffer,
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dev->interrupt_in_endpoint_size,
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ld_usb_interrupt_in_callback,
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dev,
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dev->interrupt_in_interval);
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dev->interrupt_in_running = 1;
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dev->interrupt_in_done = 0;
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retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
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if (retval) {
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dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval);
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dev->interrupt_in_running = 0;
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dev->open_count = 0;
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goto unlock_exit;
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}
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/* save device in the file's private structure */
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file->private_data = dev;
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unlock_exit:
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mutex_unlock(&dev->mutex);
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return retval;
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}
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/**
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* ld_usb_release
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*/
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static int ld_usb_release(struct inode *inode, struct file *file)
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{
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struct ld_usb *dev;
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int retval = 0;
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dev = file->private_data;
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if (dev == NULL) {
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retval = -ENODEV;
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goto exit;
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}
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if (mutex_lock_interruptible(&dev->mutex)) {
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retval = -ERESTARTSYS;
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goto exit;
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}
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if (dev->open_count != 1) {
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retval = -ENODEV;
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goto unlock_exit;
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}
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if (dev->intf == NULL) {
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/* the device was unplugged before the file was released */
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mutex_unlock(&dev->mutex);
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/* unlock here as ld_usb_delete frees dev */
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ld_usb_delete(dev);
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goto exit;
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}
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/* wait until write transfer is finished */
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if (dev->interrupt_out_busy)
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wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ);
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ld_usb_abort_transfers(dev);
|
|
dev->open_count = 0;
|
|
|
|
unlock_exit:
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ld_usb_poll
|
|
*/
|
|
static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct ld_usb *dev;
|
|
unsigned int mask = 0;
|
|
|
|
dev = file->private_data;
|
|
|
|
if (!dev->intf)
|
|
return POLLERR | POLLHUP;
|
|
|
|
poll_wait(file, &dev->read_wait, wait);
|
|
poll_wait(file, &dev->write_wait, wait);
|
|
|
|
if (dev->ring_head != dev->ring_tail)
|
|
mask |= POLLIN | POLLRDNORM;
|
|
if (!dev->interrupt_out_busy)
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
|
return mask;
|
|
}
|
|
|
|
/**
|
|
* ld_usb_read
|
|
*/
|
|
static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct ld_usb *dev;
|
|
size_t *actual_buffer;
|
|
size_t bytes_to_read;
|
|
int retval = 0;
|
|
int rv;
|
|
|
|
dev = file->private_data;
|
|
|
|
/* verify that we actually have some data to read */
|
|
if (count == 0)
|
|
goto exit;
|
|
|
|
/* lock this object */
|
|
if (mutex_lock_interruptible(&dev->mutex)) {
|
|
retval = -ERESTARTSYS;
|
|
goto exit;
|
|
}
|
|
|
|
/* verify that the device wasn't unplugged */
|
|
if (dev->intf == NULL) {
|
|
retval = -ENODEV;
|
|
printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
|
|
goto unlock_exit;
|
|
}
|
|
|
|
/* wait for data */
|
|
spin_lock_irq(&dev->rbsl);
|
|
if (dev->ring_head == dev->ring_tail) {
|
|
dev->interrupt_in_done = 0;
|
|
spin_unlock_irq(&dev->rbsl);
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
goto unlock_exit;
|
|
}
|
|
retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done);
|
|
if (retval < 0)
|
|
goto unlock_exit;
|
|
} else {
|
|
spin_unlock_irq(&dev->rbsl);
|
|
}
|
|
|
|
/* actual_buffer contains actual_length + interrupt_in_buffer */
|
|
actual_buffer = (size_t*)(dev->ring_buffer + dev->ring_tail*(sizeof(size_t)+dev->interrupt_in_endpoint_size));
|
|
bytes_to_read = min(count, *actual_buffer);
|
|
if (bytes_to_read < *actual_buffer)
|
|
dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
|
|
*actual_buffer-bytes_to_read);
|
|
|
|
/* copy one interrupt_in_buffer from ring_buffer into userspace */
|
|
if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) {
|
|
retval = -EFAULT;
|
|
goto unlock_exit;
|
|
}
|
|
dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size;
|
|
|
|
retval = bytes_to_read;
|
|
|
|
spin_lock_irq(&dev->rbsl);
|
|
if (dev->buffer_overflow) {
|
|
dev->buffer_overflow = 0;
|
|
spin_unlock_irq(&dev->rbsl);
|
|
rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
|
|
if (rv < 0)
|
|
dev->buffer_overflow = 1;
|
|
} else {
|
|
spin_unlock_irq(&dev->rbsl);
|
|
}
|
|
|
|
unlock_exit:
|
|
/* unlock the device */
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ld_usb_write
|
|
*/
|
|
static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct ld_usb *dev;
|
|
size_t bytes_to_write;
|
|
int retval = 0;
|
|
|
|
dev = file->private_data;
|
|
|
|
/* verify that we actually have some data to write */
|
|
if (count == 0)
|
|
goto exit;
|
|
|
|
/* lock this object */
|
|
if (mutex_lock_interruptible(&dev->mutex)) {
|
|
retval = -ERESTARTSYS;
|
|
goto exit;
|
|
}
|
|
|
|
/* verify that the device wasn't unplugged */
|
|
if (dev->intf == NULL) {
|
|
retval = -ENODEV;
|
|
printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval);
|
|
goto unlock_exit;
|
|
}
|
|
|
|
/* wait until previous transfer is finished */
|
|
if (dev->interrupt_out_busy) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
goto unlock_exit;
|
|
}
|
|
retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy);
|
|
if (retval < 0) {
|
|
goto unlock_exit;
|
|
}
|
|
}
|
|
|
|
/* write the data into interrupt_out_buffer from userspace */
|
|
bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
|
|
if (bytes_to_write < count)
|
|
dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n",count-bytes_to_write);
|
|
dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
|
|
__func__, count, bytes_to_write);
|
|
|
|
if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {
|
|
retval = -EFAULT;
|
|
goto unlock_exit;
|
|
}
|
|
|
|
if (dev->interrupt_out_endpoint == NULL) {
|
|
/* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
|
|
retval = usb_control_msg(interface_to_usbdev(dev->intf),
|
|
usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
|
|
9,
|
|
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
|
|
1 << 8, 0,
|
|
dev->interrupt_out_buffer,
|
|
bytes_to_write,
|
|
USB_CTRL_SET_TIMEOUT * HZ);
|
|
if (retval < 0)
|
|
dev_err(&dev->intf->dev,
|
|
"Couldn't submit HID_REQ_SET_REPORT %d\n",
|
|
retval);
|
|
goto unlock_exit;
|
|
}
|
|
|
|
/* send off the urb */
|
|
usb_fill_int_urb(dev->interrupt_out_urb,
|
|
interface_to_usbdev(dev->intf),
|
|
usb_sndintpipe(interface_to_usbdev(dev->intf),
|
|
dev->interrupt_out_endpoint->bEndpointAddress),
|
|
dev->interrupt_out_buffer,
|
|
bytes_to_write,
|
|
ld_usb_interrupt_out_callback,
|
|
dev,
|
|
dev->interrupt_out_interval);
|
|
|
|
dev->interrupt_out_busy = 1;
|
|
wmb();
|
|
|
|
retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
|
|
if (retval) {
|
|
dev->interrupt_out_busy = 0;
|
|
dev_err(&dev->intf->dev,
|
|
"Couldn't submit interrupt_out_urb %d\n", retval);
|
|
goto unlock_exit;
|
|
}
|
|
retval = bytes_to_write;
|
|
|
|
unlock_exit:
|
|
/* unlock the device */
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
/* file operations needed when we register this driver */
|
|
static const struct file_operations ld_usb_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = ld_usb_read,
|
|
.write = ld_usb_write,
|
|
.open = ld_usb_open,
|
|
.release = ld_usb_release,
|
|
.poll = ld_usb_poll,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
/*
|
|
* usb class driver info in order to get a minor number from the usb core,
|
|
* and to have the device registered with the driver core
|
|
*/
|
|
static struct usb_class_driver ld_usb_class = {
|
|
.name = "ldusb%d",
|
|
.fops = &ld_usb_fops,
|
|
.minor_base = USB_LD_MINOR_BASE,
|
|
};
|
|
|
|
/**
|
|
* ld_usb_probe
|
|
*
|
|
* Called by the usb core when a new device is connected that it thinks
|
|
* this driver might be interested in.
|
|
*/
|
|
static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(intf);
|
|
struct ld_usb *dev = NULL;
|
|
struct usb_host_interface *iface_desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
char *buffer;
|
|
int i;
|
|
int retval = -ENOMEM;
|
|
|
|
/* allocate memory for our device state and initialize it */
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (dev == NULL) {
|
|
dev_err(&intf->dev, "Out of memory\n");
|
|
goto exit;
|
|
}
|
|
mutex_init(&dev->mutex);
|
|
spin_lock_init(&dev->rbsl);
|
|
dev->intf = intf;
|
|
init_waitqueue_head(&dev->read_wait);
|
|
init_waitqueue_head(&dev->write_wait);
|
|
|
|
/* workaround for early firmware versions on fast computers */
|
|
if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) &&
|
|
((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) ||
|
|
(le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) &&
|
|
(le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) {
|
|
buffer = kmalloc(256, GFP_KERNEL);
|
|
if (buffer == NULL) {
|
|
dev_err(&intf->dev, "Couldn't allocate string buffer\n");
|
|
goto error;
|
|
}
|
|
/* usb_string makes SETUP+STALL to leave always ControlReadLoop */
|
|
usb_string(udev, 255, buffer, 256);
|
|
kfree(buffer);
|
|
}
|
|
|
|
iface_desc = intf->cur_altsetting;
|
|
|
|
/* set up the endpoint information */
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
|
|
if (usb_endpoint_is_int_in(endpoint))
|
|
dev->interrupt_in_endpoint = endpoint;
|
|
|
|
if (usb_endpoint_is_int_out(endpoint))
|
|
dev->interrupt_out_endpoint = endpoint;
|
|
}
|
|
if (dev->interrupt_in_endpoint == NULL) {
|
|
dev_err(&intf->dev, "Interrupt in endpoint not found\n");
|
|
goto error;
|
|
}
|
|
if (dev->interrupt_out_endpoint == NULL)
|
|
dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n");
|
|
|
|
dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
|
|
dev->ring_buffer = kmalloc(ring_buffer_size*(sizeof(size_t)+dev->interrupt_in_endpoint_size), GFP_KERNEL);
|
|
if (!dev->ring_buffer) {
|
|
dev_err(&intf->dev, "Couldn't allocate ring_buffer\n");
|
|
goto error;
|
|
}
|
|
dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL);
|
|
if (!dev->interrupt_in_buffer) {
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_in_buffer\n");
|
|
goto error;
|
|
}
|
|
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!dev->interrupt_in_urb) {
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_in_urb\n");
|
|
goto error;
|
|
}
|
|
dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) :
|
|
udev->descriptor.bMaxPacketSize0;
|
|
dev->interrupt_out_buffer = kmalloc(write_buffer_size*dev->interrupt_out_endpoint_size, GFP_KERNEL);
|
|
if (!dev->interrupt_out_buffer) {
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_out_buffer\n");
|
|
goto error;
|
|
}
|
|
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!dev->interrupt_out_urb) {
|
|
dev_err(&intf->dev, "Couldn't allocate interrupt_out_urb\n");
|
|
goto error;
|
|
}
|
|
dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
|
|
if (dev->interrupt_out_endpoint)
|
|
dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
|
|
|
|
/* we can register the device now, as it is ready */
|
|
usb_set_intfdata(intf, dev);
|
|
|
|
retval = usb_register_dev(intf, &ld_usb_class);
|
|
if (retval) {
|
|
/* something prevented us from registering this driver */
|
|
dev_err(&intf->dev, "Not able to get a minor for this device.\n");
|
|
usb_set_intfdata(intf, NULL);
|
|
goto error;
|
|
}
|
|
|
|
/* let the user know what node this device is now attached to */
|
|
dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n",
|
|
(intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor);
|
|
|
|
exit:
|
|
return retval;
|
|
|
|
error:
|
|
ld_usb_delete(dev);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* ld_usb_disconnect
|
|
*
|
|
* Called by the usb core when the device is removed from the system.
|
|
*/
|
|
static void ld_usb_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct ld_usb *dev;
|
|
int minor;
|
|
|
|
dev = usb_get_intfdata(intf);
|
|
usb_set_intfdata(intf, NULL);
|
|
|
|
minor = intf->minor;
|
|
|
|
/* give back our minor */
|
|
usb_deregister_dev(intf, &ld_usb_class);
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
/* if the device is not opened, then we clean up right now */
|
|
if (!dev->open_count) {
|
|
mutex_unlock(&dev->mutex);
|
|
ld_usb_delete(dev);
|
|
} else {
|
|
dev->intf = NULL;
|
|
/* wake up pollers */
|
|
wake_up_interruptible_all(&dev->read_wait);
|
|
wake_up_interruptible_all(&dev->write_wait);
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
dev_info(&intf->dev, "LD USB Device #%d now disconnected\n",
|
|
(minor - USB_LD_MINOR_BASE));
|
|
}
|
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */
|
|
static struct usb_driver ld_usb_driver = {
|
|
.name = "ldusb",
|
|
.probe = ld_usb_probe,
|
|
.disconnect = ld_usb_disconnect,
|
|
.id_table = ld_usb_table,
|
|
};
|
|
|
|
module_usb_driver(ld_usb_driver);
|
|
|