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795 lines
24 KiB
795 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
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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 <[email protected]> |
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* |
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* Derived from Lego USB Tower driver |
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* Copyright (C) 2003 David Glance <[email protected]> |
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* 2001-2004 Juergen Stuber <[email protected]> |
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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/slab.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
|
|
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#include <linux/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_POWERANALYSERCASSY 0x1040 /* USB Product ID of Power Analyser CASSY */ |
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#define USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY 0x1042 /* USB Product ID of Converter Controller CASSY */ |
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#define USB_DEVICE_ID_LD_MACHINETESTCASSY 0x1043 /* USB Product ID of Machine Test CASSY */ |
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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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#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_POWERANALYSERCASSY) }, |
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY) }, |
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{ USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETESTCASSY) }, |
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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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{ } /* Terminating entry */ |
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}; |
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MODULE_DEVICE_TABLE(usb, ld_usb_table); |
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MODULE_AUTHOR("Michael Hund <[email protected]>"); |
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MODULE_DESCRIPTION("LD USB Driver"); |
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MODULE_LICENSE("GPL"); |
|
|
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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, 0000); |
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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, 0000); |
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MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); |
|
|
|
/* 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, 0000); |
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MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); |
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|
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static int min_interrupt_out_interval = 2; |
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module_param(min_interrupt_out_interval, int, 0000); |
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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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unsigned long disconnected:1; |
|
|
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int open_count; /* number of times this port has been opened */ |
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|
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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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|
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wait_queue_head_t read_wait; |
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wait_queue_head_t write_wait; |
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|
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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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|
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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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|
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static struct usb_driver ld_usb_driver; |
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|
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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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usb_kill_urb(dev->interrupt_in_urb); |
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} |
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if (dev->interrupt_out_busy) |
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usb_kill_urb(dev->interrupt_out_urb); |
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} |
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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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/* 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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/* |
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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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unsigned long flags; |
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int retval; |
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|
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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_irqsave(&dev->rbsl, flags); |
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goto resubmit; /* maybe we can recover */ |
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} |
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} |
|
|
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spin_lock_irqsave(&dev->rbsl, flags); |
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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)); |
|
/* actual_buffer gets urb->actual_length + interrupt_in_buffer */ |
|
*actual_buffer = urb->actual_length; |
|
memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); |
|
dev->ring_head = next_ring_head; |
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dev_dbg(&dev->intf->dev, "%s: received %d bytes\n", |
|
__func__, urb->actual_length); |
|
} else { |
|
dev_warn(&dev->intf->dev, |
|
"Ring buffer overflow, %d bytes dropped\n", |
|
urb->actual_length); |
|
dev->buffer_overflow = 1; |
|
} |
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} |
|
|
|
resubmit: |
|
/* resubmit if we're still running */ |
|
if (dev->interrupt_in_running && !dev->buffer_overflow) { |
|
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); |
|
if (retval) { |
|
dev_err(&dev->intf->dev, |
|
"usb_submit_urb failed (%d)\n", retval); |
|
dev->buffer_overflow = 1; |
|
} |
|
} |
|
spin_unlock_irqrestore(&dev->rbsl, flags); |
|
exit: |
|
dev->interrupt_in_done = 1; |
|
wake_up_interruptible(&dev->read_wait); |
|
} |
|
|
|
/* |
|
* ld_usb_interrupt_out_callback |
|
*/ |
|
static void ld_usb_interrupt_out_callback(struct urb *urb) |
|
{ |
|
struct ld_usb *dev = urb->context; |
|
int status = urb->status; |
|
|
|
/* sync/async unlink faults aren't errors */ |
|
if (status && !(status == -ENOENT || |
|
status == -ECONNRESET || |
|
status == -ESHUTDOWN)) |
|
dev_dbg(&dev->intf->dev, |
|
"%s - nonzero write interrupt status received: %d\n", |
|
__func__, status); |
|
|
|
dev->interrupt_out_busy = 0; |
|
wake_up_interruptible(&dev->write_wait); |
|
} |
|
|
|
/* |
|
* ld_usb_open |
|
*/ |
|
static int ld_usb_open(struct inode *inode, struct file *file) |
|
{ |
|
struct ld_usb *dev; |
|
int subminor; |
|
int retval; |
|
struct usb_interface *interface; |
|
|
|
stream_open(inode, file); |
|
subminor = iminor(inode); |
|
|
|
interface = usb_find_interface(&ld_usb_driver, subminor); |
|
|
|
if (!interface) { |
|
printk(KERN_ERR "%s - error, can't find device for minor %d\n", |
|
__func__, subminor); |
|
return -ENODEV; |
|
} |
|
|
|
dev = usb_get_intfdata(interface); |
|
|
|
if (!dev) |
|
return -ENODEV; |
|
|
|
/* lock this device */ |
|
if (mutex_lock_interruptible(&dev->mutex)) |
|
return -ERESTARTSYS; |
|
|
|
/* allow opening only once */ |
|
if (dev->open_count) { |
|
retval = -EBUSY; |
|
goto unlock_exit; |
|
} |
|
dev->open_count = 1; |
|
|
|
/* initialize in direction */ |
|
dev->ring_head = 0; |
|
dev->ring_tail = 0; |
|
dev->buffer_overflow = 0; |
|
usb_fill_int_urb(dev->interrupt_in_urb, |
|
interface_to_usbdev(interface), |
|
usb_rcvintpipe(interface_to_usbdev(interface), |
|
dev->interrupt_in_endpoint->bEndpointAddress), |
|
dev->interrupt_in_buffer, |
|
dev->interrupt_in_endpoint_size, |
|
ld_usb_interrupt_in_callback, |
|
dev, |
|
dev->interrupt_in_interval); |
|
|
|
dev->interrupt_in_running = 1; |
|
dev->interrupt_in_done = 0; |
|
|
|
retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); |
|
if (retval) { |
|
dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); |
|
dev->interrupt_in_running = 0; |
|
dev->open_count = 0; |
|
goto unlock_exit; |
|
} |
|
|
|
/* save device in the file's private structure */ |
|
file->private_data = dev; |
|
|
|
unlock_exit: |
|
mutex_unlock(&dev->mutex); |
|
|
|
return retval; |
|
} |
|
|
|
/* |
|
* ld_usb_release |
|
*/ |
|
static int ld_usb_release(struct inode *inode, struct file *file) |
|
{ |
|
struct ld_usb *dev; |
|
int retval = 0; |
|
|
|
dev = file->private_data; |
|
|
|
if (dev == NULL) { |
|
retval = -ENODEV; |
|
goto exit; |
|
} |
|
|
|
mutex_lock(&dev->mutex); |
|
|
|
if (dev->open_count != 1) { |
|
retval = -ENODEV; |
|
goto unlock_exit; |
|
} |
|
if (dev->disconnected) { |
|
/* the device was unplugged before the file was released */ |
|
mutex_unlock(&dev->mutex); |
|
/* unlock here as ld_usb_delete frees dev */ |
|
ld_usb_delete(dev); |
|
goto exit; |
|
} |
|
|
|
/* wait until write transfer is finished */ |
|
if (dev->interrupt_out_busy) |
|
wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); |
|
ld_usb_abort_transfers(dev); |
|
dev->open_count = 0; |
|
|
|
unlock_exit: |
|
mutex_unlock(&dev->mutex); |
|
|
|
exit: |
|
return retval; |
|
} |
|
|
|
/* |
|
* ld_usb_poll |
|
*/ |
|
static __poll_t ld_usb_poll(struct file *file, poll_table *wait) |
|
{ |
|
struct ld_usb *dev; |
|
__poll_t mask = 0; |
|
|
|
dev = file->private_data; |
|
|
|
if (dev->disconnected) |
|
return EPOLLERR | EPOLLHUP; |
|
|
|
poll_wait(file, &dev->read_wait, wait); |
|
poll_wait(file, &dev->write_wait, wait); |
|
|
|
if (dev->ring_head != dev->ring_tail) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
if (!dev->interrupt_out_busy) |
|
mask |= EPOLLOUT | EPOLLWRNORM; |
|
|
|
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->disconnected) { |
|
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); |
|
while (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; |
|
|
|
spin_lock_irq(&dev->rbsl); |
|
} |
|
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)); |
|
if (*actual_buffer > dev->interrupt_in_endpoint_size) { |
|
retval = -EIO; |
|
goto unlock_exit; |
|
} |
|
bytes_to_read = min(count, *actual_buffer); |
|
if (bytes_to_read < *actual_buffer) |
|
dev_warn(&dev->intf->dev, "Read buffer overflow, %zu 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; |
|
} |
|
retval = bytes_to_read; |
|
|
|
spin_lock_irq(&dev->rbsl); |
|
dev->ring_tail = (dev->ring_tail + 1) % ring_buffer_size; |
|
|
|
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->disconnected) { |
|
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, %zu bytes dropped\n", |
|
count - bytes_to_write); |
|
dev_dbg(&dev->intf->dev, "%s: count = %zu, bytes_to_write = %zu\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); |
|
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; |
|
char *buffer; |
|
int retval = -ENOMEM; |
|
int res; |
|
|
|
/* allocate memory for our device state and initialize it */ |
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
|
if (!dev) |
|
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) |
|
goto error; |
|
/* usb_string makes SETUP+STALL to leave always ControlReadLoop */ |
|
usb_string(udev, 255, buffer, 256); |
|
kfree(buffer); |
|
} |
|
|
|
iface_desc = intf->cur_altsetting; |
|
|
|
res = usb_find_last_int_in_endpoint(iface_desc, |
|
&dev->interrupt_in_endpoint); |
|
if (res) { |
|
dev_err(&intf->dev, "Interrupt in endpoint not found\n"); |
|
retval = res; |
|
goto error; |
|
} |
|
|
|
res = usb_find_last_int_out_endpoint(iface_desc, |
|
&dev->interrupt_out_endpoint); |
|
if (res) |
|
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 = kcalloc(ring_buffer_size, |
|
sizeof(size_t) + dev->interrupt_in_endpoint_size, |
|
GFP_KERNEL); |
|
if (!dev->ring_buffer) |
|
goto error; |
|
dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); |
|
if (!dev->interrupt_in_buffer) |
|
goto error; |
|
dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!dev->interrupt_in_urb) |
|
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_array(write_buffer_size, |
|
dev->interrupt_out_endpoint_size, GFP_KERNEL); |
|
if (!dev->interrupt_out_buffer) |
|
goto error; |
|
dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!dev->interrupt_out_urb) |
|
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); |
|
|
|
usb_poison_urb(dev->interrupt_in_urb); |
|
usb_poison_urb(dev->interrupt_out_urb); |
|
|
|
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->disconnected = 1; |
|
/* 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); |
|
|
|
|