]>
Commit | Line | Data |
---|---|---|
5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /***************************************************************************** |
3 | * USBLCD Kernel Driver * | |
4 | * Version 1.05 * | |
5 | * (C) 2005 Georges Toth <g.toth@e-biz.lu> * | |
6 | * * | |
7 | * This file is licensed under the GPL. See COPYING in the package. * | |
8 | * Based on usb-skeleton.c 2.0 by Greg Kroah-Hartman (greg@kroah.com) * | |
9 | * * | |
10 | * * | |
11 | * 28.02.05 Complete rewrite of the original usblcd.c driver, * | |
12 | * based on usb_skeleton.c. * | |
13 | * This new driver allows more than one USB-LCD to be connected * | |
14 | * and controlled, at once * | |
15 | *****************************************************************************/ | |
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
1da177e4 LT |
18 | #include <linux/slab.h> |
19 | #include <linux/errno.h> | |
d5d1ceac | 20 | #include <linux/mutex.h> |
507a3ea7 | 21 | #include <linux/uaccess.h> |
1da177e4 LT |
22 | #include <linux/usb.h> |
23 | ||
24 | #define DRIVER_VERSION "USBLCD Driver Version 1.05" | |
25 | ||
26 | #define USBLCD_MINOR 144 | |
27 | ||
28 | #define IOCTL_GET_HARD_VERSION 1 | |
29 | #define IOCTL_GET_DRV_VERSION 2 | |
30 | ||
31 | ||
925ce689 | 32 | static DEFINE_MUTEX(lcd_mutex); |
33b9e162 | 33 | static const struct usb_device_id id_table[] = { |
1da177e4 LT |
34 | { .idVendor = 0x10D2, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, }, |
35 | { }, | |
36 | }; | |
507a3ea7 | 37 | MODULE_DEVICE_TABLE(usb, id_table); |
1da177e4 | 38 | |
d5d1ceac ON |
39 | static DEFINE_MUTEX(open_disc_mutex); |
40 | ||
1da177e4 LT |
41 | |
42 | struct usb_lcd { | |
507a3ea7 ZP |
43 | struct usb_device *udev; /* init: probe_lcd */ |
44 | struct usb_interface *interface; /* the interface for | |
45 | this device */ | |
46 | unsigned char *bulk_in_buffer; /* the buffer to receive | |
47 | data */ | |
48 | size_t bulk_in_size; /* the size of the | |
49 | receive buffer */ | |
50 | __u8 bulk_in_endpointAddr; /* the address of the | |
51 | bulk in endpoint */ | |
52 | __u8 bulk_out_endpointAddr; /* the address of the | |
53 | bulk out endpoint */ | |
5afeb104 | 54 | struct kref kref; |
507a3ea7 ZP |
55 | struct semaphore limit_sem; /* to stop writes at |
56 | full throttle from | |
57 | using up all RAM */ | |
58 | struct usb_anchor submitted; /* URBs to wait for | |
59 | before suspend */ | |
1da177e4 LT |
60 | }; |
61 | #define to_lcd_dev(d) container_of(d, struct usb_lcd, kref) | |
62 | ||
5afeb104 ON |
63 | #define USB_LCD_CONCURRENT_WRITES 5 |
64 | ||
1da177e4 LT |
65 | static struct usb_driver lcd_driver; |
66 | ||
67 | ||
68 | static void lcd_delete(struct kref *kref) | |
69 | { | |
70 | struct usb_lcd *dev = to_lcd_dev(kref); | |
71 | ||
72 | usb_put_dev(dev->udev); | |
507a3ea7 ZP |
73 | kfree(dev->bulk_in_buffer); |
74 | kfree(dev); | |
1da177e4 LT |
75 | } |
76 | ||
77 | ||
78 | static int lcd_open(struct inode *inode, struct file *file) | |
79 | { | |
80 | struct usb_lcd *dev; | |
81 | struct usb_interface *interface; | |
7bbe990c | 82 | int subminor, r; |
1da177e4 | 83 | |
925ce689 | 84 | mutex_lock(&lcd_mutex); |
1da177e4 LT |
85 | subminor = iminor(inode); |
86 | ||
87 | interface = usb_find_interface(&lcd_driver, subminor); | |
88 | if (!interface) { | |
925ce689 | 89 | mutex_unlock(&lcd_mutex); |
abd83e4b GKH |
90 | printk(KERN_ERR "USBLCD: %s - error, can't find device for minor %d\n", |
91 | __func__, subminor); | |
d4ead16f | 92 | return -ENODEV; |
1da177e4 LT |
93 | } |
94 | ||
d5d1ceac | 95 | mutex_lock(&open_disc_mutex); |
1da177e4 | 96 | dev = usb_get_intfdata(interface); |
d5d1ceac ON |
97 | if (!dev) { |
98 | mutex_unlock(&open_disc_mutex); | |
925ce689 | 99 | mutex_unlock(&lcd_mutex); |
d4ead16f | 100 | return -ENODEV; |
d5d1ceac | 101 | } |
1da177e4 LT |
102 | |
103 | /* increment our usage count for the device */ | |
104 | kref_get(&dev->kref); | |
d5d1ceac | 105 | mutex_unlock(&open_disc_mutex); |
1da177e4 | 106 | |
7bbe990c ON |
107 | /* grab a power reference */ |
108 | r = usb_autopm_get_interface(interface); | |
109 | if (r < 0) { | |
110 | kref_put(&dev->kref, lcd_delete); | |
925ce689 | 111 | mutex_unlock(&lcd_mutex); |
7bbe990c ON |
112 | return r; |
113 | } | |
114 | ||
1da177e4 LT |
115 | /* save our object in the file's private structure */ |
116 | file->private_data = dev; | |
925ce689 | 117 | mutex_unlock(&lcd_mutex); |
1da177e4 | 118 | |
d4ead16f | 119 | return 0; |
1da177e4 LT |
120 | } |
121 | ||
122 | static int lcd_release(struct inode *inode, struct file *file) | |
123 | { | |
124 | struct usb_lcd *dev; | |
125 | ||
5bd6e8b3 | 126 | dev = file->private_data; |
1da177e4 LT |
127 | if (dev == NULL) |
128 | return -ENODEV; | |
129 | ||
130 | /* decrement the count on our device */ | |
7bbe990c | 131 | usb_autopm_put_interface(dev->interface); |
1da177e4 LT |
132 | kref_put(&dev->kref, lcd_delete); |
133 | return 0; | |
134 | } | |
135 | ||
507a3ea7 ZP |
136 | static ssize_t lcd_read(struct file *file, char __user * buffer, |
137 | size_t count, loff_t *ppos) | |
1da177e4 LT |
138 | { |
139 | struct usb_lcd *dev; | |
140 | int retval = 0; | |
141 | int bytes_read; | |
142 | ||
5bd6e8b3 | 143 | dev = file->private_data; |
1da177e4 LT |
144 | |
145 | /* do a blocking bulk read to get data from the device */ | |
507a3ea7 ZP |
146 | retval = usb_bulk_msg(dev->udev, |
147 | usb_rcvbulkpipe(dev->udev, | |
148 | dev->bulk_in_endpointAddr), | |
1da177e4 LT |
149 | dev->bulk_in_buffer, |
150 | min(dev->bulk_in_size, count), | |
151 | &bytes_read, 10000); | |
152 | ||
153 | /* if the read was successful, copy the data to userspace */ | |
154 | if (!retval) { | |
155 | if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read)) | |
156 | retval = -EFAULT; | |
157 | else | |
158 | retval = bytes_read; | |
159 | } | |
160 | ||
161 | return retval; | |
162 | } | |
163 | ||
5cb4aeca | 164 | static long lcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
165 | { |
166 | struct usb_lcd *dev; | |
167 | u16 bcdDevice; | |
168 | char buf[30]; | |
169 | ||
5bd6e8b3 | 170 | dev = file->private_data; |
1da177e4 LT |
171 | if (dev == NULL) |
172 | return -ENODEV; | |
507a3ea7 | 173 | |
1da177e4 LT |
174 | switch (cmd) { |
175 | case IOCTL_GET_HARD_VERSION: | |
925ce689 | 176 | mutex_lock(&lcd_mutex); |
1da177e4 | 177 | bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice); |
507a3ea7 | 178 | sprintf(buf, "%1d%1d.%1d%1d", |
1da177e4 LT |
179 | (bcdDevice & 0xF000)>>12, |
180 | (bcdDevice & 0xF00)>>8, | |
181 | (bcdDevice & 0xF0)>>4, | |
182 | (bcdDevice & 0xF)); | |
925ce689 | 183 | mutex_unlock(&lcd_mutex); |
507a3ea7 | 184 | if (copy_to_user((void __user *)arg, buf, strlen(buf)) != 0) |
1da177e4 LT |
185 | return -EFAULT; |
186 | break; | |
187 | case IOCTL_GET_DRV_VERSION: | |
507a3ea7 ZP |
188 | sprintf(buf, DRIVER_VERSION); |
189 | if (copy_to_user((void __user *)arg, buf, strlen(buf)) != 0) | |
1da177e4 LT |
190 | return -EFAULT; |
191 | break; | |
192 | default: | |
193 | return -ENOTTY; | |
194 | break; | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
7d12e780 | 200 | static void lcd_write_bulk_callback(struct urb *urb) |
1da177e4 LT |
201 | { |
202 | struct usb_lcd *dev; | |
0723af13 | 203 | int status = urb->status; |
1da177e4 | 204 | |
cdc97792 | 205 | dev = urb->context; |
1da177e4 LT |
206 | |
207 | /* sync/async unlink faults aren't errors */ | |
0723af13 GKH |
208 | if (status && |
209 | !(status == -ENOENT || | |
210 | status == -ECONNRESET || | |
507a3ea7 | 211 | status == -ESHUTDOWN)) { |
d8ec7a7c GKH |
212 | dev_dbg(&dev->interface->dev, |
213 | "nonzero write bulk status received: %d\n", status); | |
1da177e4 LT |
214 | } |
215 | ||
216 | /* free up our allocated buffer */ | |
997ea58e DM |
217 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
218 | urb->transfer_buffer, urb->transfer_dma); | |
5afeb104 | 219 | up(&dev->limit_sem); |
1da177e4 LT |
220 | } |
221 | ||
507a3ea7 ZP |
222 | static ssize_t lcd_write(struct file *file, const char __user * user_buffer, |
223 | size_t count, loff_t *ppos) | |
1da177e4 LT |
224 | { |
225 | struct usb_lcd *dev; | |
507a3ea7 | 226 | int retval = 0, r; |
1da177e4 LT |
227 | struct urb *urb = NULL; |
228 | char *buf = NULL; | |
507a3ea7 | 229 | |
5bd6e8b3 | 230 | dev = file->private_data; |
507a3ea7 | 231 | |
1da177e4 LT |
232 | /* verify that we actually have some data to write */ |
233 | if (count == 0) | |
234 | goto exit; | |
235 | ||
5afeb104 ON |
236 | r = down_interruptible(&dev->limit_sem); |
237 | if (r < 0) | |
238 | return -EINTR; | |
239 | ||
1da177e4 LT |
240 | /* create a urb, and a buffer for it, and copy the data to the urb */ |
241 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
5afeb104 ON |
242 | if (!urb) { |
243 | retval = -ENOMEM; | |
244 | goto err_no_buf; | |
245 | } | |
507a3ea7 ZP |
246 | |
247 | buf = usb_alloc_coherent(dev->udev, count, GFP_KERNEL, | |
248 | &urb->transfer_dma); | |
1da177e4 LT |
249 | if (!buf) { |
250 | retval = -ENOMEM; | |
251 | goto error; | |
252 | } | |
507a3ea7 | 253 | |
1da177e4 LT |
254 | if (copy_from_user(buf, user_buffer, count)) { |
255 | retval = -EFAULT; | |
256 | goto error; | |
257 | } | |
507a3ea7 | 258 | |
1da177e4 LT |
259 | /* initialize the urb properly */ |
260 | usb_fill_bulk_urb(urb, dev->udev, | |
507a3ea7 ZP |
261 | usb_sndbulkpipe(dev->udev, |
262 | dev->bulk_out_endpointAddr), | |
1da177e4 LT |
263 | buf, count, lcd_write_bulk_callback, dev); |
264 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
7bbe990c ON |
265 | |
266 | usb_anchor_urb(urb, &dev->submitted); | |
507a3ea7 | 267 | |
1da177e4 LT |
268 | /* send the data out the bulk port */ |
269 | retval = usb_submit_urb(urb, GFP_KERNEL); | |
270 | if (retval) { | |
abd83e4b GKH |
271 | dev_err(&dev->udev->dev, |
272 | "%s - failed submitting write urb, error %d\n", | |
273 | __func__, retval); | |
7bbe990c | 274 | goto error_unanchor; |
1da177e4 | 275 | } |
507a3ea7 ZP |
276 | |
277 | /* release our reference to this urb, | |
278 | the USB core will eventually free it entirely */ | |
1da177e4 LT |
279 | usb_free_urb(urb); |
280 | ||
281 | exit: | |
282 | return count; | |
7bbe990c ON |
283 | error_unanchor: |
284 | usb_unanchor_urb(urb); | |
1da177e4 | 285 | error: |
997ea58e | 286 | usb_free_coherent(dev->udev, count, buf, urb->transfer_dma); |
1da177e4 | 287 | usb_free_urb(urb); |
5afeb104 ON |
288 | err_no_buf: |
289 | up(&dev->limit_sem); | |
1da177e4 LT |
290 | return retval; |
291 | } | |
292 | ||
066202dd | 293 | static const struct file_operations lcd_fops = { |
507a3ea7 ZP |
294 | .owner = THIS_MODULE, |
295 | .read = lcd_read, | |
296 | .write = lcd_write, | |
297 | .open = lcd_open, | |
5cb4aeca | 298 | .unlocked_ioctl = lcd_ioctl, |
507a3ea7 ZP |
299 | .release = lcd_release, |
300 | .llseek = noop_llseek, | |
1da177e4 LT |
301 | }; |
302 | ||
303 | /* | |
d6e5bcf4 GKH |
304 | * usb class driver info in order to get a minor number from the usb core, |
305 | * and to have the device registered with the driver core | |
306 | */ | |
1da177e4 | 307 | static struct usb_class_driver lcd_class = { |
507a3ea7 ZP |
308 | .name = "lcd%d", |
309 | .fops = &lcd_fops, | |
310 | .minor_base = USBLCD_MINOR, | |
1da177e4 LT |
311 | }; |
312 | ||
507a3ea7 ZP |
313 | static int lcd_probe(struct usb_interface *interface, |
314 | const struct usb_device_id *id) | |
1da177e4 LT |
315 | { |
316 | struct usb_lcd *dev = NULL; | |
aac96ef9 | 317 | struct usb_endpoint_descriptor *bulk_in, *bulk_out; |
1da177e4 | 318 | int i; |
aac96ef9 | 319 | int retval; |
1da177e4 LT |
320 | |
321 | /* allocate memory for our device state and initialize it */ | |
80b6ca48 | 322 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
a1841732 | 323 | if (!dev) |
aac96ef9 JH |
324 | return -ENOMEM; |
325 | ||
1da177e4 | 326 | kref_init(&dev->kref); |
5afeb104 | 327 | sema_init(&dev->limit_sem, USB_LCD_CONCURRENT_WRITES); |
7bbe990c | 328 | init_usb_anchor(&dev->submitted); |
1da177e4 LT |
329 | |
330 | dev->udev = usb_get_dev(interface_to_usbdev(interface)); | |
331 | dev->interface = interface; | |
332 | ||
333 | if (le16_to_cpu(dev->udev->descriptor.idProduct) != 0x0001) { | |
3b6004f3 | 334 | dev_warn(&interface->dev, "USBLCD model not supported.\n"); |
696a4ace JS |
335 | retval = -ENODEV; |
336 | goto error; | |
1da177e4 | 337 | } |
507a3ea7 | 338 | |
1da177e4 LT |
339 | /* set up the endpoint information */ |
340 | /* use only the first bulk-in and bulk-out endpoints */ | |
aac96ef9 JH |
341 | retval = usb_find_common_endpoints(interface->cur_altsetting, |
342 | &bulk_in, &bulk_out, NULL, NULL); | |
343 | if (retval) { | |
abd83e4b GKH |
344 | dev_err(&interface->dev, |
345 | "Could not find both bulk-in and bulk-out endpoints\n"); | |
1da177e4 LT |
346 | goto error; |
347 | } | |
348 | ||
aac96ef9 JH |
349 | dev->bulk_in_size = usb_endpoint_maxp(bulk_in); |
350 | dev->bulk_in_endpointAddr = bulk_in->bEndpointAddress; | |
351 | dev->bulk_in_buffer = kmalloc(dev->bulk_in_size, GFP_KERNEL); | |
352 | if (!dev->bulk_in_buffer) { | |
353 | retval = -ENOMEM; | |
354 | goto error; | |
355 | } | |
356 | ||
357 | dev->bulk_out_endpointAddr = bulk_out->bEndpointAddress; | |
358 | ||
1da177e4 LT |
359 | /* save our data pointer in this interface device */ |
360 | usb_set_intfdata(interface, dev); | |
361 | ||
362 | /* we can register the device now, as it is ready */ | |
363 | retval = usb_register_dev(interface, &lcd_class); | |
364 | if (retval) { | |
365 | /* something prevented us from registering this driver */ | |
abd83e4b GKH |
366 | dev_err(&interface->dev, |
367 | "Not able to get a minor for this device.\n"); | |
1da177e4 LT |
368 | usb_set_intfdata(interface, NULL); |
369 | goto error; | |
370 | } | |
371 | ||
372 | i = le16_to_cpu(dev->udev->descriptor.bcdDevice); | |
373 | ||
1b29a375 GKH |
374 | dev_info(&interface->dev, "USBLCD Version %1d%1d.%1d%1d found " |
375 | "at address %d\n", (i & 0xF000)>>12, (i & 0xF00)>>8, | |
507a3ea7 | 376 | (i & 0xF0)>>4, (i & 0xF), dev->udev->devnum); |
1da177e4 LT |
377 | |
378 | /* let the user know what node this device is now attached to */ | |
1b29a375 GKH |
379 | dev_info(&interface->dev, "USB LCD device now attached to USBLCD-%d\n", |
380 | interface->minor); | |
1da177e4 LT |
381 | return 0; |
382 | ||
383 | error: | |
aac96ef9 | 384 | kref_put(&dev->kref, lcd_delete); |
1da177e4 LT |
385 | return retval; |
386 | } | |
387 | ||
7bbe990c ON |
388 | static void lcd_draw_down(struct usb_lcd *dev) |
389 | { | |
390 | int time; | |
391 | ||
392 | time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000); | |
393 | if (!time) | |
394 | usb_kill_anchored_urbs(&dev->submitted); | |
395 | } | |
396 | ||
397 | static int lcd_suspend(struct usb_interface *intf, pm_message_t message) | |
398 | { | |
399 | struct usb_lcd *dev = usb_get_intfdata(intf); | |
400 | ||
401 | if (!dev) | |
402 | return 0; | |
403 | lcd_draw_down(dev); | |
404 | return 0; | |
405 | } | |
406 | ||
507a3ea7 | 407 | static int lcd_resume(struct usb_interface *intf) |
7bbe990c ON |
408 | { |
409 | return 0; | |
410 | } | |
411 | ||
1da177e4 LT |
412 | static void lcd_disconnect(struct usb_interface *interface) |
413 | { | |
414 | struct usb_lcd *dev; | |
507a3ea7 | 415 | int minor = interface->minor; |
1da177e4 | 416 | |
d5d1ceac | 417 | mutex_lock(&open_disc_mutex); |
507a3ea7 ZP |
418 | dev = usb_get_intfdata(interface); |
419 | usb_set_intfdata(interface, NULL); | |
d5d1ceac | 420 | mutex_unlock(&open_disc_mutex); |
1da177e4 | 421 | |
507a3ea7 ZP |
422 | /* give back our minor */ |
423 | usb_deregister_dev(interface, &lcd_class); | |
424 | ||
1da177e4 LT |
425 | /* decrement our usage count */ |
426 | kref_put(&dev->kref, lcd_delete); | |
427 | ||
1b29a375 | 428 | dev_info(&interface->dev, "USB LCD #%d now disconnected\n", minor); |
1da177e4 LT |
429 | } |
430 | ||
431 | static struct usb_driver lcd_driver = { | |
1da177e4 LT |
432 | .name = "usblcd", |
433 | .probe = lcd_probe, | |
434 | .disconnect = lcd_disconnect, | |
7bbe990c ON |
435 | .suspend = lcd_suspend, |
436 | .resume = lcd_resume, | |
1da177e4 | 437 | .id_table = id_table, |
7bbe990c | 438 | .supports_autosuspend = 1, |
1da177e4 LT |
439 | }; |
440 | ||
65db4305 | 441 | module_usb_driver(lcd_driver); |
1da177e4 LT |
442 | |
443 | MODULE_AUTHOR("Georges Toth <g.toth@e-biz.lu>"); | |
444 | MODULE_DESCRIPTION(DRIVER_VERSION); | |
445 | MODULE_LICENSE("GPL"); |