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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
2824bd25 MH |
2 | /** |
3 | * Generic USB driver for report based interrupt in/out devices | |
4 | * like LD Didactic's USB devices. LD Didactic's USB devices are | |
5 | * HID devices which do not use HID report definitons (they use | |
6 | * raw interrupt in and our reports only for communication). | |
7 | * | |
8 | * This driver uses a ring buffer for time critical reading of | |
9 | * interrupt in reports and provides read and write methods for | |
10 | * raw interrupt reports (similar to the Windows HID driver). | |
11 | * Devices based on the book USB COMPLETE by Jan Axelson may need | |
12 | * such a compatibility to the Windows HID driver. | |
13 | * | |
14 | * Copyright (C) 2005 Michael Hund <mhund@ld-didactic.de> | |
15 | * | |
2824bd25 MH |
16 | * Derived from Lego USB Tower driver |
17 | * Copyright (C) 2003 David Glance <advidgsf@sourceforge.net> | |
18 | * 2001-2004 Juergen Stuber <starblue@users.sourceforge.net> | |
2824bd25 MH |
19 | */ |
20 | ||
2824bd25 MH |
21 | #include <linux/kernel.h> |
22 | #include <linux/errno.h> | |
2824bd25 MH |
23 | #include <linux/slab.h> |
24 | #include <linux/module.h> | |
4186ecf8 | 25 | #include <linux/mutex.h> |
2824bd25 | 26 | |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
2824bd25 MH |
28 | #include <linux/input.h> |
29 | #include <linux/usb.h> | |
30 | #include <linux/poll.h> | |
31 | ||
32 | /* Define these values to match your devices */ | |
33 | #define USB_VENDOR_ID_LD 0x0f11 /* USB Vendor ID of LD Didactic GmbH */ | |
ce97cac8 MH |
34 | #define USB_DEVICE_ID_LD_CASSY 0x1000 /* USB Product ID of CASSY-S modules with 8 bytes endpoint size */ |
35 | #define USB_DEVICE_ID_LD_CASSY2 0x1001 /* USB Product ID of CASSY-S modules with 64 bytes endpoint size */ | |
ba3e66e9 | 36 | #define USB_DEVICE_ID_LD_POCKETCASSY 0x1010 /* USB Product ID of Pocket-CASSY */ |
ce97cac8 | 37 | #define USB_DEVICE_ID_LD_POCKETCASSY2 0x1011 /* USB Product ID of Pocket-CASSY 2 (reserved) */ |
ba3e66e9 | 38 | #define USB_DEVICE_ID_LD_MOBILECASSY 0x1020 /* USB Product ID of Mobile-CASSY */ |
ce97cac8 MH |
39 | #define USB_DEVICE_ID_LD_MOBILECASSY2 0x1021 /* USB Product ID of Mobile-CASSY 2 (reserved) */ |
40 | #define USB_DEVICE_ID_LD_MICROCASSYVOLTAGE 0x1031 /* USB Product ID of Micro-CASSY Voltage */ | |
41 | #define USB_DEVICE_ID_LD_MICROCASSYCURRENT 0x1032 /* USB Product ID of Micro-CASSY Current */ | |
42 | #define USB_DEVICE_ID_LD_MICROCASSYTIME 0x1033 /* USB Product ID of Micro-CASSY Time (reserved) */ | |
43 | #define USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE 0x1035 /* USB Product ID of Micro-CASSY Temperature */ | |
44 | #define USB_DEVICE_ID_LD_MICROCASSYPH 0x1038 /* USB Product ID of Micro-CASSY pH */ | |
52ad2bd8 KK |
45 | #define USB_DEVICE_ID_LD_POWERANALYSERCASSY 0x1040 /* USB Product ID of Power Analyser CASSY */ |
46 | #define USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY 0x1042 /* USB Product ID of Converter Controller CASSY */ | |
47 | #define USB_DEVICE_ID_LD_MACHINETESTCASSY 0x1043 /* USB Product ID of Machine Test CASSY */ | |
ba3e66e9 MH |
48 | #define USB_DEVICE_ID_LD_JWM 0x1080 /* USB Product ID of Joule and Wattmeter */ |
49 | #define USB_DEVICE_ID_LD_DMMP 0x1081 /* USB Product ID of Digital Multimeter P (reserved) */ | |
50 | #define USB_DEVICE_ID_LD_UMIP 0x1090 /* USB Product ID of UMI P */ | |
ce97cac8 MH |
51 | #define USB_DEVICE_ID_LD_UMIC 0x10A0 /* USB Product ID of UMI C */ |
52 | #define USB_DEVICE_ID_LD_UMIB 0x10B0 /* USB Product ID of UMI B */ | |
53 | #define USB_DEVICE_ID_LD_XRAY 0x1100 /* USB Product ID of X-Ray Apparatus 55481 */ | |
54 | #define USB_DEVICE_ID_LD_XRAY2 0x1101 /* USB Product ID of X-Ray Apparatus 554800 */ | |
55 | #define USB_DEVICE_ID_LD_XRAYCT 0x1110 /* USB Product ID of X-Ray Apparatus CT 554821*/ | |
ba3e66e9 | 56 | #define USB_DEVICE_ID_LD_VIDEOCOM 0x1200 /* USB Product ID of VideoCom */ |
ce97cac8 | 57 | #define USB_DEVICE_ID_LD_MOTOR 0x1210 /* USB Product ID of Motor (reserved) */ |
ba3e66e9 MH |
58 | #define USB_DEVICE_ID_LD_COM3LAB 0x2000 /* USB Product ID of COM3LAB */ |
59 | #define USB_DEVICE_ID_LD_TELEPORT 0x2010 /* USB Product ID of Terminal Adapter */ | |
60 | #define USB_DEVICE_ID_LD_NETWORKANALYSER 0x2020 /* USB Product ID of Network Analyser */ | |
61 | #define USB_DEVICE_ID_LD_POWERCONTROL 0x2030 /* USB Product ID of Converter Control Unit */ | |
62 | #define USB_DEVICE_ID_LD_MACHINETEST 0x2040 /* USB Product ID of Machine Test System */ | |
ce97cac8 MH |
63 | #define USB_DEVICE_ID_LD_MOSTANALYSER 0x2050 /* USB Product ID of MOST Protocol Analyser */ |
64 | #define USB_DEVICE_ID_LD_MOSTANALYSER2 0x2051 /* USB Product ID of MOST Protocol Analyser 2 */ | |
65 | #define USB_DEVICE_ID_LD_ABSESP 0x2060 /* USB Product ID of ABS ESP */ | |
66 | #define USB_DEVICE_ID_LD_AUTODATABUS 0x2070 /* USB Product ID of Automotive Data Buses */ | |
67 | #define USB_DEVICE_ID_LD_MCT 0x2080 /* USB Product ID of Microcontroller technique */ | |
68 | #define USB_DEVICE_ID_LD_HYBRID 0x2090 /* USB Product ID of Automotive Hybrid */ | |
69 | #define USB_DEVICE_ID_LD_HEATCONTROL 0x20A0 /* USB Product ID of Heat control */ | |
2824bd25 | 70 | |
2824bd25 MH |
71 | #ifdef CONFIG_USB_DYNAMIC_MINORS |
72 | #define USB_LD_MINOR_BASE 0 | |
73 | #else | |
74 | #define USB_LD_MINOR_BASE 176 | |
75 | #endif | |
76 | ||
77 | /* table of devices that work with this driver */ | |
33b9e162 | 78 | static const struct usb_device_id ld_usb_table[] = { |
ba3e66e9 | 79 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY) }, |
ce97cac8 | 80 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CASSY2) }, |
ba3e66e9 | 81 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY) }, |
ce97cac8 | 82 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POCKETCASSY2) }, |
ba3e66e9 | 83 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY) }, |
ce97cac8 MH |
84 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOBILECASSY2) }, |
85 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYVOLTAGE) }, | |
86 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYCURRENT) }, | |
87 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTIME) }, | |
88 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYTEMPERATURE) }, | |
89 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MICROCASSYPH) }, | |
52ad2bd8 KK |
90 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERANALYSERCASSY) }, |
91 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_CONVERTERCONTROLLERCASSY) }, | |
92 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETESTCASSY) }, | |
ba3e66e9 MH |
93 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_JWM) }, |
94 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_DMMP) }, | |
95 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIP) }, | |
ce97cac8 MH |
96 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIC) }, |
97 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_UMIB) }, | |
98 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY) }, | |
ba3e66e9 MH |
99 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_XRAY2) }, |
100 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_VIDEOCOM) }, | |
ce97cac8 | 101 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOTOR) }, |
ba3e66e9 MH |
102 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_COM3LAB) }, |
103 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_TELEPORT) }, | |
104 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_NETWORKANALYSER) }, | |
105 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_POWERCONTROL) }, | |
106 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MACHINETEST) }, | |
ce97cac8 MH |
107 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER) }, |
108 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MOSTANALYSER2) }, | |
109 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_ABSESP) }, | |
110 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_AUTODATABUS) }, | |
111 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_MCT) }, | |
112 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HYBRID) }, | |
113 | { USB_DEVICE(USB_VENDOR_ID_LD, USB_DEVICE_ID_LD_HEATCONTROL) }, | |
2824bd25 MH |
114 | { } /* Terminating entry */ |
115 | }; | |
116 | MODULE_DEVICE_TABLE(usb, ld_usb_table); | |
2824bd25 MH |
117 | MODULE_AUTHOR("Michael Hund <mhund@ld-didactic.de>"); |
118 | MODULE_DESCRIPTION("LD USB Driver"); | |
119 | MODULE_LICENSE("GPL"); | |
120 | MODULE_SUPPORTED_DEVICE("LD USB Devices"); | |
121 | ||
2824bd25 MH |
122 | /* All interrupt in transfers are collected in a ring buffer to |
123 | * avoid racing conditions and get better performance of the driver. | |
124 | */ | |
125 | static int ring_buffer_size = 128; | |
3d1a4673 | 126 | module_param(ring_buffer_size, int, 0000); |
2824bd25 MH |
127 | MODULE_PARM_DESC(ring_buffer_size, "Read ring buffer size in reports"); |
128 | ||
129 | /* The write_buffer can contain more than one interrupt out transfer. | |
130 | */ | |
131 | static int write_buffer_size = 10; | |
3d1a4673 | 132 | module_param(write_buffer_size, int, 0000); |
2824bd25 MH |
133 | MODULE_PARM_DESC(write_buffer_size, "Write buffer size in reports"); |
134 | ||
135 | /* As of kernel version 2.6.4 ehci-hcd uses an | |
136 | * "only one interrupt transfer per frame" shortcut | |
137 | * to simplify the scheduling of periodic transfers. | |
138 | * This conflicts with our standard 1ms intervals for in and out URBs. | |
139 | * We use default intervals of 2ms for in and 2ms for out transfers, | |
140 | * which should be fast enough. | |
141 | * Increase the interval to allow more devices that do interrupt transfers, | |
142 | * or set to 1 to use the standard interval from the endpoint descriptors. | |
143 | */ | |
144 | static int min_interrupt_in_interval = 2; | |
3d1a4673 | 145 | module_param(min_interrupt_in_interval, int, 0000); |
2824bd25 MH |
146 | MODULE_PARM_DESC(min_interrupt_in_interval, "Minimum interrupt in interval in ms"); |
147 | ||
148 | static int min_interrupt_out_interval = 2; | |
3d1a4673 | 149 | module_param(min_interrupt_out_interval, int, 0000); |
2824bd25 MH |
150 | MODULE_PARM_DESC(min_interrupt_out_interval, "Minimum interrupt out interval in ms"); |
151 | ||
152 | /* Structure to hold all of our device specific stuff */ | |
153 | struct ld_usb { | |
ce0d7d3f | 154 | struct mutex mutex; /* locks this structure */ |
4d72e35d | 155 | struct usb_interface *intf; /* save off the usb interface pointer */ |
2824bd25 MH |
156 | |
157 | int open_count; /* number of times this port has been opened */ | |
158 | ||
4d72e35d | 159 | char *ring_buffer; |
2824bd25 MH |
160 | unsigned int ring_head; |
161 | unsigned int ring_tail; | |
162 | ||
163 | wait_queue_head_t read_wait; | |
164 | wait_queue_head_t write_wait; | |
165 | ||
4d72e35d MR |
166 | char *interrupt_in_buffer; |
167 | struct usb_endpoint_descriptor *interrupt_in_endpoint; | |
168 | struct urb *interrupt_in_urb; | |
2824bd25 MH |
169 | int interrupt_in_interval; |
170 | size_t interrupt_in_endpoint_size; | |
171 | int interrupt_in_running; | |
172 | int interrupt_in_done; | |
9d33efd9 ON |
173 | int buffer_overflow; |
174 | spinlock_t rbsl; | |
2824bd25 | 175 | |
4d72e35d MR |
176 | char *interrupt_out_buffer; |
177 | struct usb_endpoint_descriptor *interrupt_out_endpoint; | |
178 | struct urb *interrupt_out_urb; | |
2824bd25 MH |
179 | int interrupt_out_interval; |
180 | size_t interrupt_out_endpoint_size; | |
181 | int interrupt_out_busy; | |
182 | }; | |
183 | ||
2824bd25 MH |
184 | static struct usb_driver ld_usb_driver; |
185 | ||
186 | /** | |
187 | * ld_usb_abort_transfers | |
188 | * aborts transfers and frees associated data structures | |
189 | */ | |
190 | static void ld_usb_abort_transfers(struct ld_usb *dev) | |
191 | { | |
192 | /* shutdown transfer */ | |
193 | if (dev->interrupt_in_running) { | |
194 | dev->interrupt_in_running = 0; | |
195 | if (dev->intf) | |
196 | usb_kill_urb(dev->interrupt_in_urb); | |
197 | } | |
198 | if (dev->interrupt_out_busy) | |
199 | if (dev->intf) | |
200 | usb_kill_urb(dev->interrupt_out_urb); | |
201 | } | |
202 | ||
203 | /** | |
204 | * ld_usb_delete | |
205 | */ | |
206 | static void ld_usb_delete(struct ld_usb *dev) | |
207 | { | |
208 | ld_usb_abort_transfers(dev); | |
209 | ||
210 | /* free data structures */ | |
211 | usb_free_urb(dev->interrupt_in_urb); | |
212 | usb_free_urb(dev->interrupt_out_urb); | |
213 | kfree(dev->ring_buffer); | |
214 | kfree(dev->interrupt_in_buffer); | |
215 | kfree(dev->interrupt_out_buffer); | |
216 | kfree(dev); | |
217 | } | |
218 | ||
219 | /** | |
220 | * ld_usb_interrupt_in_callback | |
221 | */ | |
7d12e780 | 222 | static void ld_usb_interrupt_in_callback(struct urb *urb) |
2824bd25 MH |
223 | { |
224 | struct ld_usb *dev = urb->context; | |
225 | size_t *actual_buffer; | |
226 | unsigned int next_ring_head; | |
491c021e | 227 | int status = urb->status; |
2824bd25 MH |
228 | int retval; |
229 | ||
491c021e GKH |
230 | if (status) { |
231 | if (status == -ENOENT || | |
232 | status == -ECONNRESET || | |
233 | status == -ESHUTDOWN) { | |
2824bd25 MH |
234 | goto exit; |
235 | } else { | |
457163c4 GKH |
236 | dev_dbg(&dev->intf->dev, |
237 | "%s: nonzero status received: %d\n", __func__, | |
238 | status); | |
9d33efd9 | 239 | spin_lock(&dev->rbsl); |
2824bd25 MH |
240 | goto resubmit; /* maybe we can recover */ |
241 | } | |
242 | } | |
243 | ||
9d33efd9 | 244 | spin_lock(&dev->rbsl); |
2824bd25 MH |
245 | if (urb->actual_length > 0) { |
246 | next_ring_head = (dev->ring_head+1) % ring_buffer_size; | |
247 | if (next_ring_head != dev->ring_tail) { | |
4d72e35d | 248 | actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_head * (sizeof(size_t)+dev->interrupt_in_endpoint_size)); |
2824bd25 MH |
249 | /* actual_buffer gets urb->actual_length + interrupt_in_buffer */ |
250 | *actual_buffer = urb->actual_length; | |
251 | memcpy(actual_buffer+1, dev->interrupt_in_buffer, urb->actual_length); | |
252 | dev->ring_head = next_ring_head; | |
457163c4 GKH |
253 | dev_dbg(&dev->intf->dev, "%s: received %d bytes\n", |
254 | __func__, urb->actual_length); | |
9d33efd9 | 255 | } else { |
2824bd25 MH |
256 | dev_warn(&dev->intf->dev, |
257 | "Ring buffer overflow, %d bytes dropped\n", | |
258 | urb->actual_length); | |
9d33efd9 ON |
259 | dev->buffer_overflow = 1; |
260 | } | |
2824bd25 MH |
261 | } |
262 | ||
263 | resubmit: | |
264 | /* resubmit if we're still running */ | |
9d33efd9 | 265 | if (dev->interrupt_in_running && !dev->buffer_overflow && dev->intf) { |
2824bd25 | 266 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_ATOMIC); |
9d33efd9 | 267 | if (retval) { |
2824bd25 MH |
268 | dev_err(&dev->intf->dev, |
269 | "usb_submit_urb failed (%d)\n", retval); | |
9d33efd9 ON |
270 | dev->buffer_overflow = 1; |
271 | } | |
2824bd25 | 272 | } |
9d33efd9 | 273 | spin_unlock(&dev->rbsl); |
2824bd25 MH |
274 | exit: |
275 | dev->interrupt_in_done = 1; | |
276 | wake_up_interruptible(&dev->read_wait); | |
277 | } | |
278 | ||
279 | /** | |
280 | * ld_usb_interrupt_out_callback | |
281 | */ | |
7d12e780 | 282 | static void ld_usb_interrupt_out_callback(struct urb *urb) |
2824bd25 MH |
283 | { |
284 | struct ld_usb *dev = urb->context; | |
491c021e | 285 | int status = urb->status; |
2824bd25 MH |
286 | |
287 | /* sync/async unlink faults aren't errors */ | |
491c021e GKH |
288 | if (status && !(status == -ENOENT || |
289 | status == -ECONNRESET || | |
290 | status == -ESHUTDOWN)) | |
457163c4 GKH |
291 | dev_dbg(&dev->intf->dev, |
292 | "%s - nonzero write interrupt status received: %d\n", | |
293 | __func__, status); | |
2824bd25 MH |
294 | |
295 | dev->interrupt_out_busy = 0; | |
296 | wake_up_interruptible(&dev->write_wait); | |
297 | } | |
298 | ||
299 | /** | |
300 | * ld_usb_open | |
301 | */ | |
302 | static int ld_usb_open(struct inode *inode, struct file *file) | |
303 | { | |
304 | struct ld_usb *dev; | |
305 | int subminor; | |
d4ead16f | 306 | int retval; |
2824bd25 MH |
307 | struct usb_interface *interface; |
308 | ||
309 | nonseekable_open(inode, file); | |
310 | subminor = iminor(inode); | |
311 | ||
2824bd25 MH |
312 | interface = usb_find_interface(&ld_usb_driver, subminor); |
313 | ||
314 | if (!interface) { | |
b22862e5 GKH |
315 | printk(KERN_ERR "%s - error, can't find device for minor %d\n", |
316 | __func__, subminor); | |
d4ead16f | 317 | return -ENODEV; |
2824bd25 MH |
318 | } |
319 | ||
320 | dev = usb_get_intfdata(interface); | |
321 | ||
6248c52f | 322 | if (!dev) |
d4ead16f | 323 | return -ENODEV; |
2824bd25 MH |
324 | |
325 | /* lock this device */ | |
6248c52f | 326 | if (mutex_lock_interruptible(&dev->mutex)) |
d4ead16f | 327 | return -ERESTARTSYS; |
2824bd25 MH |
328 | |
329 | /* allow opening only once */ | |
330 | if (dev->open_count) { | |
331 | retval = -EBUSY; | |
332 | goto unlock_exit; | |
333 | } | |
334 | dev->open_count = 1; | |
335 | ||
336 | /* initialize in direction */ | |
337 | dev->ring_head = 0; | |
338 | dev->ring_tail = 0; | |
9d33efd9 | 339 | dev->buffer_overflow = 0; |
2824bd25 MH |
340 | usb_fill_int_urb(dev->interrupt_in_urb, |
341 | interface_to_usbdev(interface), | |
342 | usb_rcvintpipe(interface_to_usbdev(interface), | |
343 | dev->interrupt_in_endpoint->bEndpointAddress), | |
344 | dev->interrupt_in_buffer, | |
345 | dev->interrupt_in_endpoint_size, | |
346 | ld_usb_interrupt_in_callback, | |
347 | dev, | |
348 | dev->interrupt_in_interval); | |
349 | ||
350 | dev->interrupt_in_running = 1; | |
351 | dev->interrupt_in_done = 0; | |
352 | ||
353 | retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
354 | if (retval) { | |
355 | dev_err(&interface->dev, "Couldn't submit interrupt_in_urb %d\n", retval); | |
356 | dev->interrupt_in_running = 0; | |
357 | dev->open_count = 0; | |
358 | goto unlock_exit; | |
359 | } | |
360 | ||
361 | /* save device in the file's private structure */ | |
362 | file->private_data = dev; | |
363 | ||
364 | unlock_exit: | |
ce0d7d3f | 365 | mutex_unlock(&dev->mutex); |
2824bd25 | 366 | |
2824bd25 MH |
367 | return retval; |
368 | } | |
369 | ||
370 | /** | |
371 | * ld_usb_release | |
372 | */ | |
373 | static int ld_usb_release(struct inode *inode, struct file *file) | |
374 | { | |
375 | struct ld_usb *dev; | |
376 | int retval = 0; | |
377 | ||
378 | dev = file->private_data; | |
379 | ||
380 | if (dev == NULL) { | |
381 | retval = -ENODEV; | |
382 | goto exit; | |
383 | } | |
384 | ||
ce0d7d3f | 385 | if (mutex_lock_interruptible(&dev->mutex)) { |
2824bd25 MH |
386 | retval = -ERESTARTSYS; |
387 | goto exit; | |
388 | } | |
389 | ||
390 | if (dev->open_count != 1) { | |
391 | retval = -ENODEV; | |
392 | goto unlock_exit; | |
393 | } | |
394 | if (dev->intf == NULL) { | |
395 | /* the device was unplugged before the file was released */ | |
ce0d7d3f | 396 | mutex_unlock(&dev->mutex); |
2824bd25 MH |
397 | /* unlock here as ld_usb_delete frees dev */ |
398 | ld_usb_delete(dev); | |
399 | goto exit; | |
400 | } | |
401 | ||
402 | /* wait until write transfer is finished */ | |
403 | if (dev->interrupt_out_busy) | |
404 | wait_event_interruptible_timeout(dev->write_wait, !dev->interrupt_out_busy, 2 * HZ); | |
405 | ld_usb_abort_transfers(dev); | |
406 | dev->open_count = 0; | |
407 | ||
408 | unlock_exit: | |
ce0d7d3f | 409 | mutex_unlock(&dev->mutex); |
2824bd25 MH |
410 | |
411 | exit: | |
412 | return retval; | |
413 | } | |
414 | ||
415 | /** | |
416 | * ld_usb_poll | |
417 | */ | |
afc9a42b | 418 | static __poll_t ld_usb_poll(struct file *file, poll_table *wait) |
2824bd25 MH |
419 | { |
420 | struct ld_usb *dev; | |
afc9a42b | 421 | __poll_t mask = 0; |
2824bd25 MH |
422 | |
423 | dev = file->private_data; | |
424 | ||
d12b85e7 | 425 | if (!dev->intf) |
a9a08845 | 426 | return EPOLLERR | EPOLLHUP; |
d12b85e7 | 427 | |
2824bd25 MH |
428 | poll_wait(file, &dev->read_wait, wait); |
429 | poll_wait(file, &dev->write_wait, wait); | |
430 | ||
431 | if (dev->ring_head != dev->ring_tail) | |
a9a08845 | 432 | mask |= EPOLLIN | EPOLLRDNORM; |
2824bd25 | 433 | if (!dev->interrupt_out_busy) |
a9a08845 | 434 | mask |= EPOLLOUT | EPOLLWRNORM; |
2824bd25 MH |
435 | |
436 | return mask; | |
437 | } | |
438 | ||
439 | /** | |
440 | * ld_usb_read | |
441 | */ | |
442 | static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, | |
443 | loff_t *ppos) | |
444 | { | |
445 | struct ld_usb *dev; | |
446 | size_t *actual_buffer; | |
447 | size_t bytes_to_read; | |
448 | int retval = 0; | |
9d33efd9 | 449 | int rv; |
2824bd25 MH |
450 | |
451 | dev = file->private_data; | |
452 | ||
453 | /* verify that we actually have some data to read */ | |
454 | if (count == 0) | |
455 | goto exit; | |
456 | ||
457 | /* lock this object */ | |
ce0d7d3f | 458 | if (mutex_lock_interruptible(&dev->mutex)) { |
2824bd25 MH |
459 | retval = -ERESTARTSYS; |
460 | goto exit; | |
461 | } | |
462 | ||
463 | /* verify that the device wasn't unplugged */ | |
464 | if (dev->intf == NULL) { | |
465 | retval = -ENODEV; | |
b22862e5 | 466 | printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); |
2824bd25 MH |
467 | goto unlock_exit; |
468 | } | |
469 | ||
470 | /* wait for data */ | |
9d33efd9 | 471 | spin_lock_irq(&dev->rbsl); |
2824bd25 | 472 | if (dev->ring_head == dev->ring_tail) { |
9d33efd9 ON |
473 | dev->interrupt_in_done = 0; |
474 | spin_unlock_irq(&dev->rbsl); | |
2824bd25 MH |
475 | if (file->f_flags & O_NONBLOCK) { |
476 | retval = -EAGAIN; | |
477 | goto unlock_exit; | |
478 | } | |
479 | retval = wait_event_interruptible(dev->read_wait, dev->interrupt_in_done); | |
480 | if (retval < 0) | |
481 | goto unlock_exit; | |
9d33efd9 ON |
482 | } else { |
483 | spin_unlock_irq(&dev->rbsl); | |
2824bd25 MH |
484 | } |
485 | ||
486 | /* actual_buffer contains actual_length + interrupt_in_buffer */ | |
4d72e35d | 487 | actual_buffer = (size_t *)(dev->ring_buffer + dev->ring_tail * (sizeof(size_t)+dev->interrupt_in_endpoint_size)); |
2824bd25 MH |
488 | bytes_to_read = min(count, *actual_buffer); |
489 | if (bytes_to_read < *actual_buffer) | |
dd7d5008 | 490 | dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n", |
2824bd25 MH |
491 | *actual_buffer-bytes_to_read); |
492 | ||
493 | /* copy one interrupt_in_buffer from ring_buffer into userspace */ | |
494 | if (copy_to_user(buffer, actual_buffer+1, bytes_to_read)) { | |
495 | retval = -EFAULT; | |
496 | goto unlock_exit; | |
497 | } | |
498 | dev->ring_tail = (dev->ring_tail+1) % ring_buffer_size; | |
499 | ||
500 | retval = bytes_to_read; | |
501 | ||
9d33efd9 ON |
502 | spin_lock_irq(&dev->rbsl); |
503 | if (dev->buffer_overflow) { | |
504 | dev->buffer_overflow = 0; | |
505 | spin_unlock_irq(&dev->rbsl); | |
506 | rv = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL); | |
507 | if (rv < 0) | |
508 | dev->buffer_overflow = 1; | |
509 | } else { | |
510 | spin_unlock_irq(&dev->rbsl); | |
511 | } | |
512 | ||
2824bd25 MH |
513 | unlock_exit: |
514 | /* unlock the device */ | |
ce0d7d3f | 515 | mutex_unlock(&dev->mutex); |
2824bd25 MH |
516 | |
517 | exit: | |
518 | return retval; | |
519 | } | |
520 | ||
521 | /** | |
522 | * ld_usb_write | |
523 | */ | |
524 | static ssize_t ld_usb_write(struct file *file, const char __user *buffer, | |
525 | size_t count, loff_t *ppos) | |
526 | { | |
527 | struct ld_usb *dev; | |
528 | size_t bytes_to_write; | |
529 | int retval = 0; | |
530 | ||
531 | dev = file->private_data; | |
532 | ||
533 | /* verify that we actually have some data to write */ | |
534 | if (count == 0) | |
535 | goto exit; | |
536 | ||
537 | /* lock this object */ | |
ce0d7d3f | 538 | if (mutex_lock_interruptible(&dev->mutex)) { |
2824bd25 MH |
539 | retval = -ERESTARTSYS; |
540 | goto exit; | |
541 | } | |
542 | ||
543 | /* verify that the device wasn't unplugged */ | |
544 | if (dev->intf == NULL) { | |
545 | retval = -ENODEV; | |
b22862e5 | 546 | printk(KERN_ERR "ldusb: No device or device unplugged %d\n", retval); |
2824bd25 MH |
547 | goto unlock_exit; |
548 | } | |
549 | ||
550 | /* wait until previous transfer is finished */ | |
551 | if (dev->interrupt_out_busy) { | |
552 | if (file->f_flags & O_NONBLOCK) { | |
553 | retval = -EAGAIN; | |
554 | goto unlock_exit; | |
555 | } | |
556 | retval = wait_event_interruptible(dev->write_wait, !dev->interrupt_out_busy); | |
557 | if (retval < 0) { | |
558 | goto unlock_exit; | |
559 | } | |
560 | } | |
561 | ||
562 | /* write the data into interrupt_out_buffer from userspace */ | |
563 | bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); | |
564 | if (bytes_to_write < count) | |
e314621b | 565 | dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n", count-bytes_to_write); |
457163c4 GKH |
566 | dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", |
567 | __func__, count, bytes_to_write); | |
2824bd25 MH |
568 | |
569 | if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { | |
570 | retval = -EFAULT; | |
571 | goto unlock_exit; | |
572 | } | |
573 | ||
574 | if (dev->interrupt_out_endpoint == NULL) { | |
575 | /* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */ | |
576 | retval = usb_control_msg(interface_to_usbdev(dev->intf), | |
577 | usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0), | |
578 | 9, | |
579 | USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT, | |
580 | 1 << 8, 0, | |
581 | dev->interrupt_out_buffer, | |
582 | bytes_to_write, | |
583 | USB_CTRL_SET_TIMEOUT * HZ); | |
584 | if (retval < 0) | |
b22862e5 GKH |
585 | dev_err(&dev->intf->dev, |
586 | "Couldn't submit HID_REQ_SET_REPORT %d\n", | |
587 | retval); | |
2824bd25 MH |
588 | goto unlock_exit; |
589 | } | |
590 | ||
591 | /* send off the urb */ | |
592 | usb_fill_int_urb(dev->interrupt_out_urb, | |
593 | interface_to_usbdev(dev->intf), | |
594 | usb_sndintpipe(interface_to_usbdev(dev->intf), | |
595 | dev->interrupt_out_endpoint->bEndpointAddress), | |
596 | dev->interrupt_out_buffer, | |
597 | bytes_to_write, | |
598 | ld_usb_interrupt_out_callback, | |
599 | dev, | |
600 | dev->interrupt_out_interval); | |
601 | ||
602 | dev->interrupt_out_busy = 1; | |
603 | wmb(); | |
604 | ||
605 | retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL); | |
606 | if (retval) { | |
607 | dev->interrupt_out_busy = 0; | |
b22862e5 GKH |
608 | dev_err(&dev->intf->dev, |
609 | "Couldn't submit interrupt_out_urb %d\n", retval); | |
2824bd25 MH |
610 | goto unlock_exit; |
611 | } | |
612 | retval = bytes_to_write; | |
613 | ||
614 | unlock_exit: | |
615 | /* unlock the device */ | |
ce0d7d3f | 616 | mutex_unlock(&dev->mutex); |
2824bd25 MH |
617 | |
618 | exit: | |
619 | return retval; | |
620 | } | |
621 | ||
622 | /* file operations needed when we register this driver */ | |
066202dd | 623 | static const struct file_operations ld_usb_fops = { |
2824bd25 MH |
624 | .owner = THIS_MODULE, |
625 | .read = ld_usb_read, | |
626 | .write = ld_usb_write, | |
627 | .open = ld_usb_open, | |
628 | .release = ld_usb_release, | |
629 | .poll = ld_usb_poll, | |
6038f373 | 630 | .llseek = no_llseek, |
2824bd25 MH |
631 | }; |
632 | ||
633 | /* | |
634 | * usb class driver info in order to get a minor number from the usb core, | |
595b14cb | 635 | * and to have the device registered with the driver core |
2824bd25 MH |
636 | */ |
637 | static struct usb_class_driver ld_usb_class = { | |
638 | .name = "ldusb%d", | |
639 | .fops = &ld_usb_fops, | |
640 | .minor_base = USB_LD_MINOR_BASE, | |
641 | }; | |
642 | ||
643 | /** | |
644 | * ld_usb_probe | |
645 | * | |
646 | * Called by the usb core when a new device is connected that it thinks | |
647 | * this driver might be interested in. | |
648 | */ | |
649 | static int ld_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
650 | { | |
651 | struct usb_device *udev = interface_to_usbdev(intf); | |
652 | struct ld_usb *dev = NULL; | |
653 | struct usb_host_interface *iface_desc; | |
2824bd25 | 654 | char *buffer; |
2824bd25 | 655 | int retval = -ENOMEM; |
2707ca16 | 656 | int res; |
2824bd25 | 657 | |
b595076a | 658 | /* allocate memory for our device state and initialize it */ |
2824bd25 | 659 | |
1144cf7a | 660 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
6714ffae | 661 | if (!dev) |
2824bd25 | 662 | goto exit; |
ce0d7d3f | 663 | mutex_init(&dev->mutex); |
9d33efd9 | 664 | spin_lock_init(&dev->rbsl); |
2824bd25 MH |
665 | dev->intf = intf; |
666 | init_waitqueue_head(&dev->read_wait); | |
667 | init_waitqueue_head(&dev->write_wait); | |
668 | ||
669 | /* workaround for early firmware versions on fast computers */ | |
670 | if ((le16_to_cpu(udev->descriptor.idVendor) == USB_VENDOR_ID_LD) && | |
ba3e66e9 MH |
671 | ((le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_CASSY) || |
672 | (le16_to_cpu(udev->descriptor.idProduct) == USB_DEVICE_ID_LD_COM3LAB)) && | |
2824bd25 MH |
673 | (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x103)) { |
674 | buffer = kmalloc(256, GFP_KERNEL); | |
6714ffae | 675 | if (!buffer) |
a6db592e | 676 | goto error; |
2824bd25 MH |
677 | /* usb_string makes SETUP+STALL to leave always ControlReadLoop */ |
678 | usb_string(udev, 255, buffer, 256); | |
679 | kfree(buffer); | |
680 | } | |
681 | ||
682 | iface_desc = intf->cur_altsetting; | |
683 | ||
2707ca16 JH |
684 | res = usb_find_last_int_in_endpoint(iface_desc, |
685 | &dev->interrupt_in_endpoint); | |
686 | if (res) { | |
2824bd25 | 687 | dev_err(&intf->dev, "Interrupt in endpoint not found\n"); |
2707ca16 | 688 | retval = res; |
2824bd25 MH |
689 | goto error; |
690 | } | |
2707ca16 JH |
691 | |
692 | res = usb_find_last_int_out_endpoint(iface_desc, | |
693 | &dev->interrupt_out_endpoint); | |
694 | if (res) | |
2824bd25 MH |
695 | dev_warn(&intf->dev, "Interrupt out endpoint not found (using control endpoint instead)\n"); |
696 | ||
29cc8897 | 697 | dev->interrupt_in_endpoint_size = usb_endpoint_maxp(dev->interrupt_in_endpoint); |
6da2ec56 KC |
698 | dev->ring_buffer = |
699 | kmalloc_array(ring_buffer_size, | |
700 | sizeof(size_t) + dev->interrupt_in_endpoint_size, | |
701 | GFP_KERNEL); | |
6714ffae | 702 | if (!dev->ring_buffer) |
2824bd25 | 703 | goto error; |
2824bd25 | 704 | dev->interrupt_in_buffer = kmalloc(dev->interrupt_in_endpoint_size, GFP_KERNEL); |
6714ffae | 705 | if (!dev->interrupt_in_buffer) |
2824bd25 | 706 | goto error; |
2824bd25 | 707 | dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
2d403903 | 708 | if (!dev->interrupt_in_urb) |
2824bd25 | 709 | goto error; |
29cc8897 | 710 | dev->interrupt_out_endpoint_size = dev->interrupt_out_endpoint ? usb_endpoint_maxp(dev->interrupt_out_endpoint) : |
2824bd25 | 711 | udev->descriptor.bMaxPacketSize0; |
6da2ec56 KC |
712 | dev->interrupt_out_buffer = |
713 | kmalloc_array(write_buffer_size, | |
714 | dev->interrupt_out_endpoint_size, GFP_KERNEL); | |
6714ffae | 715 | if (!dev->interrupt_out_buffer) |
2824bd25 | 716 | goto error; |
2824bd25 | 717 | dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
2d403903 | 718 | if (!dev->interrupt_out_urb) |
2824bd25 | 719 | goto error; |
2824bd25 MH |
720 | dev->interrupt_in_interval = min_interrupt_in_interval > dev->interrupt_in_endpoint->bInterval ? min_interrupt_in_interval : dev->interrupt_in_endpoint->bInterval; |
721 | if (dev->interrupt_out_endpoint) | |
722 | dev->interrupt_out_interval = min_interrupt_out_interval > dev->interrupt_out_endpoint->bInterval ? min_interrupt_out_interval : dev->interrupt_out_endpoint->bInterval; | |
723 | ||
724 | /* we can register the device now, as it is ready */ | |
725 | usb_set_intfdata(intf, dev); | |
726 | ||
727 | retval = usb_register_dev(intf, &ld_usb_class); | |
728 | if (retval) { | |
729 | /* something prevented us from registering this driver */ | |
730 | dev_err(&intf->dev, "Not able to get a minor for this device.\n"); | |
731 | usb_set_intfdata(intf, NULL); | |
732 | goto error; | |
733 | } | |
734 | ||
735 | /* let the user know what node this device is now attached to */ | |
736 | dev_info(&intf->dev, "LD USB Device #%d now attached to major %d minor %d\n", | |
737 | (intf->minor - USB_LD_MINOR_BASE), USB_MAJOR, intf->minor); | |
738 | ||
739 | exit: | |
740 | return retval; | |
741 | ||
742 | error: | |
743 | ld_usb_delete(dev); | |
744 | ||
745 | return retval; | |
746 | } | |
747 | ||
748 | /** | |
749 | * ld_usb_disconnect | |
750 | * | |
751 | * Called by the usb core when the device is removed from the system. | |
752 | */ | |
753 | static void ld_usb_disconnect(struct usb_interface *intf) | |
754 | { | |
755 | struct ld_usb *dev; | |
756 | int minor; | |
757 | ||
2824bd25 MH |
758 | dev = usb_get_intfdata(intf); |
759 | usb_set_intfdata(intf, NULL); | |
760 | ||
2824bd25 MH |
761 | minor = intf->minor; |
762 | ||
763 | /* give back our minor */ | |
764 | usb_deregister_dev(intf, &ld_usb_class); | |
765 | ||
ce0d7d3f | 766 | mutex_lock(&dev->mutex); |
d4ead16f | 767 | |
2824bd25 MH |
768 | /* if the device is not opened, then we clean up right now */ |
769 | if (!dev->open_count) { | |
ce0d7d3f | 770 | mutex_unlock(&dev->mutex); |
2824bd25 MH |
771 | ld_usb_delete(dev); |
772 | } else { | |
773 | dev->intf = NULL; | |
d12b85e7 ON |
774 | /* wake up pollers */ |
775 | wake_up_interruptible_all(&dev->read_wait); | |
776 | wake_up_interruptible_all(&dev->write_wait); | |
ce0d7d3f | 777 | mutex_unlock(&dev->mutex); |
2824bd25 MH |
778 | } |
779 | ||
2824bd25 MH |
780 | dev_info(&intf->dev, "LD USB Device #%d now disconnected\n", |
781 | (minor - USB_LD_MINOR_BASE)); | |
782 | } | |
783 | ||
784 | /* usb specific object needed to register this driver with the usb subsystem */ | |
785 | static struct usb_driver ld_usb_driver = { | |
2824bd25 MH |
786 | .name = "ldusb", |
787 | .probe = ld_usb_probe, | |
788 | .disconnect = ld_usb_disconnect, | |
789 | .id_table = ld_usb_table, | |
790 | }; | |
791 | ||
65db4305 | 792 | module_usb_driver(ld_usb_driver); |
2824bd25 | 793 |