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6c54c28e AS |
1 | /* |
2 | * dell_rbu.c | |
3 | * Bios Update driver for Dell systems | |
4 | * Author: Dell Inc | |
5 | * Abhay Salunke <abhay_salunke@dell.com> | |
6 | * | |
7 | * Copyright (C) 2005 Dell Inc. | |
8 | * | |
9 | * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by | |
10 | * creating entries in the /sys file systems on Linux 2.6 and higher | |
11 | * kernels. The driver supports two mechanism to update the BIOS namely | |
12 | * contiguous and packetized. Both these methods still require having some | |
13 | * application to set the CMOS bit indicating the BIOS to update itself | |
14 | * after a reboot. | |
15 | * | |
16 | * Contiguous method: | |
17 | * This driver writes the incoming data in a monolithic image by allocating | |
18 | * contiguous physical pages large enough to accommodate the incoming BIOS | |
19 | * image size. | |
20 | * | |
21 | * Packetized method: | |
22 | * The driver writes the incoming packet image by allocating a new packet | |
23 | * on every time the packet data is written. This driver requires an | |
24 | * application to break the BIOS image in to fixed sized packet chunks. | |
25 | * | |
26 | * See Documentation/dell_rbu.txt for more info. | |
27 | * | |
28 | * This program is free software; you can redistribute it and/or modify | |
29 | * it under the terms of the GNU General Public License v2.0 as published by | |
30 | * the Free Software Foundation | |
31 | * | |
32 | * This program is distributed in the hope that it will be useful, | |
33 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
34 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
35 | * GNU General Public License for more details. | |
36 | */ | |
37 | #include <linux/version.h> | |
38 | #include <linux/config.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/errno.h> | |
43 | #include <linux/blkdev.h> | |
44 | #include <linux/device.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/moduleparam.h> | |
47 | #include <linux/firmware.h> | |
48 | #include <linux/dma-mapping.h> | |
49 | ||
50 | MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>"); | |
51 | MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); | |
52 | MODULE_LICENSE("GPL"); | |
e61c0e33 | 53 | MODULE_VERSION("2.0"); |
6c54c28e AS |
54 | |
55 | #define BIOS_SCAN_LIMIT 0xffffffff | |
56 | #define MAX_IMAGE_LENGTH 16 | |
57 | static struct _rbu_data { | |
58 | void *image_update_buffer; | |
59 | unsigned long image_update_buffer_size; | |
60 | unsigned long bios_image_size; | |
61 | int image_update_ordernum; | |
62 | int dma_alloc; | |
63 | spinlock_t lock; | |
64 | unsigned long packet_read_count; | |
65 | unsigned long packet_write_count; | |
66 | unsigned long num_packets; | |
67 | unsigned long packetsize; | |
e61c0e33 | 68 | int entry_created; |
6c54c28e AS |
69 | } rbu_data; |
70 | ||
e61c0e33 AS |
71 | static char image_type[MAX_IMAGE_LENGTH + 1] = "mono"; |
72 | module_param_string(image_type, image_type, sizeof (image_type), 0); | |
6c54c28e AS |
73 | MODULE_PARM_DESC(image_type, "BIOS image type. choose- mono or packet"); |
74 | ||
75 | struct packet_data { | |
76 | struct list_head list; | |
77 | size_t length; | |
78 | void *data; | |
79 | int ordernum; | |
80 | }; | |
81 | ||
82 | static struct packet_data packet_data_head; | |
83 | ||
84 | static struct platform_device *rbu_device; | |
85 | static int context; | |
86 | static dma_addr_t dell_rbu_dmaaddr; | |
87 | ||
e61c0e33 AS |
88 | static void |
89 | init_packet_head(void) | |
6c54c28e AS |
90 | { |
91 | INIT_LIST_HEAD(&packet_data_head.list); | |
92 | rbu_data.packet_write_count = 0; | |
93 | rbu_data.packet_read_count = 0; | |
94 | rbu_data.num_packets = 0; | |
95 | rbu_data.packetsize = 0; | |
96 | } | |
97 | ||
e61c0e33 AS |
98 | static int |
99 | fill_last_packet(void *data, size_t length) | |
6c54c28e AS |
100 | { |
101 | struct list_head *ptemp_list; | |
102 | struct packet_data *packet = NULL; | |
103 | int packet_count = 0; | |
104 | ||
105 | pr_debug("fill_last_packet: entry \n"); | |
106 | ||
107 | if (!rbu_data.num_packets) { | |
108 | pr_debug("fill_last_packet: num_packets=0\n"); | |
109 | return -ENOMEM; | |
110 | } | |
111 | ||
112 | packet_count = rbu_data.num_packets; | |
113 | ||
114 | ptemp_list = (&packet_data_head.list)->prev; | |
115 | ||
116 | packet = list_entry(ptemp_list, struct packet_data, list); | |
117 | ||
118 | if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) { | |
119 | pr_debug("dell_rbu:%s: packet size data " | |
e61c0e33 | 120 | "overrun\n", __FUNCTION__); |
6c54c28e AS |
121 | return -EINVAL; |
122 | } | |
123 | ||
124 | pr_debug("fill_last_packet : buffer = %p\n", packet->data); | |
125 | ||
126 | memcpy((packet->data + rbu_data.packet_write_count), data, length); | |
127 | ||
128 | if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) { | |
129 | /* | |
130 | * this was the last data chunk in the packet | |
131 | * so reinitialize the packet data counter to zero | |
132 | */ | |
133 | rbu_data.packet_write_count = 0; | |
134 | } else | |
135 | rbu_data.packet_write_count += length; | |
136 | ||
137 | pr_debug("fill_last_packet: exit \n"); | |
138 | return 0; | |
139 | } | |
140 | ||
e61c0e33 AS |
141 | static int |
142 | create_packet(size_t length) | |
6c54c28e AS |
143 | { |
144 | struct packet_data *newpacket; | |
145 | int ordernum = 0; | |
146 | ||
147 | pr_debug("create_packet: entry \n"); | |
148 | ||
149 | if (!rbu_data.packetsize) { | |
150 | pr_debug("create_packet: packetsize not specified\n"); | |
151 | return -EINVAL; | |
152 | } | |
e61c0e33 AS |
153 | spin_unlock(&rbu_data.lock); |
154 | newpacket = kmalloc(sizeof (struct packet_data), GFP_KERNEL); | |
155 | spin_lock(&rbu_data.lock); | |
6c54c28e | 156 | |
6c54c28e AS |
157 | if (!newpacket) { |
158 | printk(KERN_WARNING | |
e61c0e33 AS |
159 | "dell_rbu:%s: failed to allocate new " |
160 | "packet\n", __FUNCTION__); | |
6c54c28e AS |
161 | return -ENOMEM; |
162 | } | |
163 | ||
164 | ordernum = get_order(length); | |
165 | /* | |
166 | * there is no upper limit on memory | |
167 | * address for packetized mechanism | |
168 | */ | |
e61c0e33 AS |
169 | spin_unlock(&rbu_data.lock); |
170 | newpacket->data = (unsigned char *) __get_free_pages(GFP_KERNEL, | |
171 | ordernum); | |
172 | spin_lock(&rbu_data.lock); | |
6c54c28e AS |
173 | |
174 | pr_debug("create_packet: newpacket %p\n", newpacket->data); | |
175 | ||
176 | if (!newpacket->data) { | |
177 | printk(KERN_WARNING | |
e61c0e33 AS |
178 | "dell_rbu:%s: failed to allocate new " |
179 | "packet\n", __FUNCTION__); | |
6c54c28e AS |
180 | kfree(newpacket); |
181 | return -ENOMEM; | |
182 | } | |
183 | ||
184 | newpacket->ordernum = ordernum; | |
185 | ++rbu_data.num_packets; | |
186 | /* | |
187 | * initialize the newly created packet headers | |
188 | */ | |
189 | INIT_LIST_HEAD(&newpacket->list); | |
190 | list_add_tail(&newpacket->list, &packet_data_head.list); | |
191 | /* | |
192 | * packets have fixed size | |
193 | */ | |
194 | newpacket->length = rbu_data.packetsize; | |
195 | ||
196 | pr_debug("create_packet: exit \n"); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
e61c0e33 AS |
201 | static int |
202 | packetize_data(void *data, size_t length) | |
6c54c28e AS |
203 | { |
204 | int rc = 0; | |
205 | ||
206 | if (!rbu_data.packet_write_count) { | |
207 | if ((rc = create_packet(length))) | |
208 | return rc; | |
209 | } | |
210 | if ((rc = fill_last_packet(data, length))) | |
211 | return rc; | |
212 | ||
213 | return rc; | |
214 | } | |
215 | ||
216 | static int | |
217 | do_packet_read(char *data, struct list_head *ptemp_list, | |
e61c0e33 | 218 | int length, int bytes_read, int *list_read_count) |
6c54c28e AS |
219 | { |
220 | void *ptemp_buf; | |
221 | struct packet_data *newpacket = NULL; | |
222 | int bytes_copied = 0; | |
223 | int j = 0; | |
224 | ||
225 | newpacket = list_entry(ptemp_list, struct packet_data, list); | |
226 | *list_read_count += newpacket->length; | |
227 | ||
228 | if (*list_read_count > bytes_read) { | |
229 | /* point to the start of unread data */ | |
230 | j = newpacket->length - (*list_read_count - bytes_read); | |
231 | /* point to the offset in the packet buffer */ | |
232 | ptemp_buf = (u8 *) newpacket->data + j; | |
233 | /* | |
234 | * check if there is enough room in | |
235 | * * the incoming buffer | |
236 | */ | |
237 | if (length > (*list_read_count - bytes_read)) | |
238 | /* | |
239 | * copy what ever is there in this | |
240 | * packet and move on | |
241 | */ | |
242 | bytes_copied = (*list_read_count - bytes_read); | |
243 | else | |
244 | /* copy the remaining */ | |
245 | bytes_copied = length; | |
246 | memcpy(data, ptemp_buf, bytes_copied); | |
247 | } | |
248 | return bytes_copied; | |
249 | } | |
250 | ||
e61c0e33 AS |
251 | static int |
252 | packet_read_list(char *data, size_t * pread_length) | |
6c54c28e AS |
253 | { |
254 | struct list_head *ptemp_list; | |
255 | int temp_count = 0; | |
256 | int bytes_copied = 0; | |
257 | int bytes_read = 0; | |
258 | int remaining_bytes = 0; | |
259 | char *pdest = data; | |
260 | ||
261 | /* check if we have any packets */ | |
262 | if (0 == rbu_data.num_packets) | |
263 | return -ENOMEM; | |
264 | ||
265 | remaining_bytes = *pread_length; | |
266 | bytes_read = rbu_data.packet_read_count; | |
267 | ||
268 | ptemp_list = (&packet_data_head.list)->next; | |
269 | while (!list_empty(ptemp_list)) { | |
270 | bytes_copied = do_packet_read(pdest, ptemp_list, | |
e61c0e33 | 271 | remaining_bytes, bytes_read, &temp_count); |
6c54c28e AS |
272 | remaining_bytes -= bytes_copied; |
273 | bytes_read += bytes_copied; | |
274 | pdest += bytes_copied; | |
275 | /* | |
276 | * check if we reached end of buffer before reaching the | |
277 | * last packet | |
278 | */ | |
279 | if (remaining_bytes == 0) | |
280 | break; | |
281 | ||
282 | ptemp_list = ptemp_list->next; | |
283 | } | |
284 | /*finally set the bytes read */ | |
285 | *pread_length = bytes_read - rbu_data.packet_read_count; | |
286 | rbu_data.packet_read_count = bytes_read; | |
287 | return 0; | |
288 | } | |
289 | ||
e61c0e33 AS |
290 | static void |
291 | packet_empty_list(void) | |
6c54c28e AS |
292 | { |
293 | struct list_head *ptemp_list; | |
294 | struct list_head *pnext_list; | |
295 | struct packet_data *newpacket; | |
296 | ||
297 | ptemp_list = (&packet_data_head.list)->next; | |
298 | while (!list_empty(ptemp_list)) { | |
299 | newpacket = | |
e61c0e33 | 300 | list_entry(ptemp_list, struct packet_data, list); |
6c54c28e AS |
301 | pnext_list = ptemp_list->next; |
302 | list_del(ptemp_list); | |
303 | ptemp_list = pnext_list; | |
304 | /* | |
305 | * zero out the RBU packet memory before freeing | |
306 | * to make sure there are no stale RBU packets left in memory | |
307 | */ | |
308 | memset(newpacket->data, 0, rbu_data.packetsize); | |
e61c0e33 AS |
309 | free_pages((unsigned long) newpacket->data, |
310 | newpacket->ordernum); | |
6c54c28e AS |
311 | kfree(newpacket); |
312 | } | |
313 | rbu_data.packet_write_count = 0; | |
314 | rbu_data.packet_read_count = 0; | |
315 | rbu_data.num_packets = 0; | |
316 | rbu_data.packetsize = 0; | |
317 | } | |
318 | ||
319 | /* | |
320 | * img_update_free: Frees the buffer allocated for storing BIOS image | |
321 | * Always called with lock held and returned with lock held | |
322 | */ | |
e61c0e33 AS |
323 | static void |
324 | img_update_free(void) | |
6c54c28e AS |
325 | { |
326 | if (!rbu_data.image_update_buffer) | |
327 | return; | |
328 | /* | |
329 | * zero out this buffer before freeing it to get rid of any stale | |
330 | * BIOS image copied in memory. | |
331 | */ | |
332 | memset(rbu_data.image_update_buffer, 0, | |
e61c0e33 | 333 | rbu_data.image_update_buffer_size); |
6c54c28e AS |
334 | if (rbu_data.dma_alloc == 1) |
335 | dma_free_coherent(NULL, rbu_data.bios_image_size, | |
e61c0e33 | 336 | rbu_data.image_update_buffer, dell_rbu_dmaaddr); |
6c54c28e | 337 | else |
e61c0e33 AS |
338 | free_pages((unsigned long) rbu_data.image_update_buffer, |
339 | rbu_data.image_update_ordernum); | |
6c54c28e AS |
340 | |
341 | /* | |
342 | * Re-initialize the rbu_data variables after a free | |
343 | */ | |
344 | rbu_data.image_update_ordernum = -1; | |
345 | rbu_data.image_update_buffer = NULL; | |
346 | rbu_data.image_update_buffer_size = 0; | |
347 | rbu_data.bios_image_size = 0; | |
348 | rbu_data.dma_alloc = 0; | |
349 | } | |
350 | ||
351 | /* | |
352 | * img_update_realloc: This function allocates the contiguous pages to | |
353 | * accommodate the requested size of data. The memory address and size | |
354 | * values are stored globally and on every call to this function the new | |
355 | * size is checked to see if more data is required than the existing size. | |
356 | * If true the previous memory is freed and new allocation is done to | |
357 | * accommodate the new size. If the incoming size is less then than the | |
358 | * already allocated size, then that memory is reused. This function is | |
359 | * called with lock held and returns with lock held. | |
360 | */ | |
e61c0e33 AS |
361 | static int |
362 | img_update_realloc(unsigned long size) | |
6c54c28e AS |
363 | { |
364 | unsigned char *image_update_buffer = NULL; | |
365 | unsigned long rc; | |
366 | unsigned long img_buf_phys_addr; | |
367 | int ordernum; | |
368 | int dma_alloc = 0; | |
369 | ||
370 | /* | |
371 | * check if the buffer of sufficient size has been | |
372 | * already allocated | |
373 | */ | |
374 | if (rbu_data.image_update_buffer_size >= size) { | |
375 | /* | |
376 | * check for corruption | |
377 | */ | |
378 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { | |
379 | printk(KERN_ERR "dell_rbu:%s: corruption " | |
e61c0e33 | 380 | "check failed\n", __FUNCTION__); |
6c54c28e AS |
381 | return -EINVAL; |
382 | } | |
383 | /* | |
384 | * we have a valid pre-allocated buffer with | |
385 | * sufficient size | |
386 | */ | |
387 | return 0; | |
388 | } | |
389 | ||
390 | /* | |
391 | * free any previously allocated buffer | |
392 | */ | |
393 | img_update_free(); | |
394 | ||
395 | spin_unlock(&rbu_data.lock); | |
396 | ||
397 | ordernum = get_order(size); | |
398 | image_update_buffer = | |
e61c0e33 | 399 | (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum); |
6c54c28e AS |
400 | |
401 | img_buf_phys_addr = | |
e61c0e33 | 402 | (unsigned long) virt_to_phys(image_update_buffer); |
6c54c28e AS |
403 | |
404 | if (img_buf_phys_addr > BIOS_SCAN_LIMIT) { | |
e61c0e33 | 405 | free_pages((unsigned long) image_update_buffer, ordernum); |
6c54c28e AS |
406 | ordernum = -1; |
407 | image_update_buffer = dma_alloc_coherent(NULL, size, | |
e61c0e33 | 408 | &dell_rbu_dmaaddr, GFP_KERNEL); |
6c54c28e AS |
409 | dma_alloc = 1; |
410 | } | |
411 | ||
412 | spin_lock(&rbu_data.lock); | |
413 | ||
414 | if (image_update_buffer != NULL) { | |
415 | rbu_data.image_update_buffer = image_update_buffer; | |
416 | rbu_data.image_update_buffer_size = size; | |
417 | rbu_data.bios_image_size = | |
e61c0e33 | 418 | rbu_data.image_update_buffer_size; |
6c54c28e AS |
419 | rbu_data.image_update_ordernum = ordernum; |
420 | rbu_data.dma_alloc = dma_alloc; | |
421 | rc = 0; | |
422 | } else { | |
423 | pr_debug("Not enough memory for image update:" | |
e61c0e33 | 424 | "size = %ld\n", size); |
6c54c28e AS |
425 | rc = -ENOMEM; |
426 | } | |
427 | ||
428 | return rc; | |
429 | } | |
430 | ||
e61c0e33 AS |
431 | static ssize_t |
432 | read_packet_data(char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
433 | { |
434 | int retval; | |
435 | size_t bytes_left; | |
436 | size_t data_length; | |
437 | char *ptempBuf = buffer; | |
438 | unsigned long imagesize; | |
439 | ||
440 | /* check to see if we have something to return */ | |
441 | if (rbu_data.num_packets == 0) { | |
442 | pr_debug("read_packet_data: no packets written\n"); | |
443 | retval = -ENOMEM; | |
444 | goto read_rbu_data_exit; | |
445 | } | |
446 | ||
447 | imagesize = rbu_data.num_packets * rbu_data.packetsize; | |
448 | ||
449 | if (pos > imagesize) { | |
450 | retval = 0; | |
451 | printk(KERN_WARNING "dell_rbu:read_packet_data: " | |
e61c0e33 | 452 | "data underrun\n"); |
6c54c28e AS |
453 | goto read_rbu_data_exit; |
454 | } | |
455 | ||
456 | bytes_left = imagesize - pos; | |
457 | data_length = min(bytes_left, count); | |
458 | ||
459 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) | |
460 | goto read_rbu_data_exit; | |
461 | ||
462 | if ((pos + count) > imagesize) { | |
463 | rbu_data.packet_read_count = 0; | |
464 | /* this was the last copy */ | |
465 | retval = bytes_left; | |
466 | } else | |
467 | retval = count; | |
468 | ||
469 | read_rbu_data_exit: | |
470 | return retval; | |
471 | } | |
472 | ||
e61c0e33 AS |
473 | static ssize_t |
474 | read_rbu_mono_data(char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
475 | { |
476 | unsigned char *ptemp = NULL; | |
477 | size_t bytes_left = 0; | |
478 | size_t data_length = 0; | |
479 | ssize_t ret_count = 0; | |
480 | ||
481 | /* check to see if we have something to return */ | |
482 | if ((rbu_data.image_update_buffer == NULL) || | |
e61c0e33 | 483 | (rbu_data.bios_image_size == 0)) { |
6c54c28e | 484 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
e61c0e33 AS |
485 | "bios_image_size %lu\n", |
486 | rbu_data.image_update_buffer, | |
487 | rbu_data.bios_image_size); | |
6c54c28e AS |
488 | ret_count = -ENOMEM; |
489 | goto read_rbu_data_exit; | |
490 | } | |
491 | ||
492 | if (pos > rbu_data.bios_image_size) { | |
493 | ret_count = 0; | |
494 | goto read_rbu_data_exit; | |
495 | } | |
496 | ||
497 | bytes_left = rbu_data.bios_image_size - pos; | |
498 | data_length = min(bytes_left, count); | |
499 | ||
500 | ptemp = rbu_data.image_update_buffer; | |
501 | memcpy(buffer, (ptemp + pos), data_length); | |
502 | ||
503 | if ((pos + count) > rbu_data.bios_image_size) | |
504 | /* this was the last copy */ | |
505 | ret_count = bytes_left; | |
506 | else | |
507 | ret_count = count; | |
508 | read_rbu_data_exit: | |
509 | return ret_count; | |
510 | } | |
511 | ||
512 | static ssize_t | |
513 | read_rbu_data(struct kobject *kobj, char *buffer, loff_t pos, size_t count) | |
514 | { | |
515 | ssize_t ret_count = 0; | |
516 | ||
517 | spin_lock(&rbu_data.lock); | |
518 | ||
519 | if (!strcmp(image_type, "mono")) | |
520 | ret_count = read_rbu_mono_data(buffer, pos, count); | |
521 | else if (!strcmp(image_type, "packet")) | |
522 | ret_count = read_packet_data(buffer, pos, count); | |
523 | else | |
524 | pr_debug("read_rbu_data: invalid image type specified\n"); | |
525 | ||
526 | spin_unlock(&rbu_data.lock); | |
527 | return ret_count; | |
528 | } | |
529 | ||
e61c0e33 AS |
530 | static void |
531 | callbackfn_rbu(const struct firmware *fw, void *context) | |
532 | { | |
533 | int rc = 0; | |
534 | ||
535 | if (!fw || !fw->size) { | |
536 | rbu_data.entry_created = 0; | |
537 | return; | |
538 | } | |
539 | ||
540 | spin_lock(&rbu_data.lock); | |
541 | if (!strcmp(image_type, "mono")) { | |
542 | if (!img_update_realloc(fw->size)) | |
543 | memcpy(rbu_data.image_update_buffer, | |
544 | fw->data, fw->size); | |
545 | } else if (!strcmp(image_type, "packet")) { | |
546 | if (!rbu_data.packetsize) | |
547 | rbu_data.packetsize = fw->size; | |
548 | else if (rbu_data.packetsize != fw->size) { | |
549 | packet_empty_list(); | |
550 | rbu_data.packetsize = fw->size; | |
551 | } | |
552 | packetize_data(fw->data, fw->size); | |
553 | } else | |
554 | pr_debug("invalid image type specified.\n"); | |
555 | spin_unlock(&rbu_data.lock); | |
556 | ||
557 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, | |
558 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); | |
559 | if (rc) | |
560 | printk(KERN_ERR | |
561 | "dell_rbu:%s request_firmware_nowait failed" | |
562 | " %d\n", __FUNCTION__, rc); | |
563 | else | |
564 | rbu_data.entry_created = 1; | |
565 | } | |
566 | ||
6c54c28e AS |
567 | static ssize_t |
568 | read_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos, | |
e61c0e33 | 569 | size_t count) |
6c54c28e AS |
570 | { |
571 | int size = 0; | |
572 | if (!pos) | |
573 | size = sprintf(buffer, "%s\n", image_type); | |
574 | return size; | |
575 | } | |
576 | ||
577 | static ssize_t | |
578 | write_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos, | |
e61c0e33 | 579 | size_t count) |
6c54c28e AS |
580 | { |
581 | int rc = count; | |
e61c0e33 AS |
582 | int req_firm_rc = 0; |
583 | int i; | |
6c54c28e | 584 | spin_lock(&rbu_data.lock); |
e61c0e33 AS |
585 | /* |
586 | * Find the first newline or space | |
587 | */ | |
588 | for (i = 0; i < count; ++i) | |
589 | if (buffer[i] == '\n' || buffer[i] == ' ') { | |
590 | buffer[i] = '\0'; | |
591 | break; | |
592 | } | |
593 | if (i == count) | |
594 | buffer[count] = '\0'; | |
595 | ||
596 | if (strstr(buffer, "mono")) | |
597 | strcpy(image_type, "mono"); | |
598 | else if (strstr(buffer, "packet")) | |
599 | strcpy(image_type, "packet"); | |
600 | else if (strstr(buffer, "init")) { | |
601 | /* | |
602 | * If due to the user error the driver gets in a bad | |
603 | * state where even though it is loaded , the | |
604 | * /sys/class/firmware/dell_rbu entries are missing. | |
605 | * to cover this situation the user can recreate entries | |
606 | * by writing init to image_type. | |
607 | */ | |
608 | if (!rbu_data.entry_created) { | |
609 | spin_unlock(&rbu_data.lock); | |
610 | req_firm_rc = request_firmware_nowait(THIS_MODULE, | |
611 | FW_ACTION_NOHOTPLUG, "dell_rbu", | |
612 | &rbu_device->dev, &context, | |
613 | callbackfn_rbu); | |
614 | if (req_firm_rc) { | |
615 | printk(KERN_ERR | |
616 | "dell_rbu:%s request_firmware_nowait" | |
617 | " failed %d\n", __FUNCTION__, rc); | |
618 | rc = -EIO; | |
619 | } else | |
620 | rbu_data.entry_created = 1; | |
621 | ||
622 | spin_lock(&rbu_data.lock); | |
623 | } | |
624 | } else { | |
625 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); | |
626 | spin_unlock(&rbu_data.lock); | |
627 | return -EINVAL; | |
628 | } | |
6c54c28e AS |
629 | |
630 | /* we must free all previous allocations */ | |
631 | packet_empty_list(); | |
632 | img_update_free(); | |
6c54c28e | 633 | spin_unlock(&rbu_data.lock); |
6c54c28e | 634 | |
e61c0e33 | 635 | return rc; |
6c54c28e AS |
636 | } |
637 | ||
638 | static struct bin_attribute rbu_data_attr = { | |
639 | .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444}, | |
640 | .read = read_rbu_data, | |
641 | }; | |
642 | ||
643 | static struct bin_attribute rbu_image_type_attr = { | |
644 | .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644}, | |
645 | .read = read_rbu_image_type, | |
646 | .write = write_rbu_image_type, | |
647 | }; | |
648 | ||
e61c0e33 AS |
649 | static int __init |
650 | dcdrbu_init(void) | |
6c54c28e AS |
651 | { |
652 | int rc = 0; | |
653 | spin_lock_init(&rbu_data.lock); | |
654 | ||
655 | init_packet_head(); | |
656 | rbu_device = | |
e61c0e33 | 657 | platform_device_register_simple("dell_rbu", -1, NULL, 0); |
6c54c28e AS |
658 | if (!rbu_device) { |
659 | printk(KERN_ERR | |
e61c0e33 AS |
660 | "dell_rbu:%s:platform_device_register_simple " |
661 | "failed\n", __FUNCTION__); | |
6c54c28e AS |
662 | return -EIO; |
663 | } | |
664 | ||
665 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); | |
666 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
667 | ||
668 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, | |
e61c0e33 | 669 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); |
6c54c28e AS |
670 | if (rc) |
671 | printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait" | |
e61c0e33 AS |
672 | " failed %d\n", __FUNCTION__, rc); |
673 | else | |
674 | rbu_data.entry_created = 1; | |
6c54c28e AS |
675 | |
676 | return rc; | |
677 | ||
678 | } | |
679 | ||
e61c0e33 AS |
680 | static __exit void |
681 | dcdrbu_exit(void) | |
6c54c28e AS |
682 | { |
683 | spin_lock(&rbu_data.lock); | |
684 | packet_empty_list(); | |
685 | img_update_free(); | |
686 | spin_unlock(&rbu_data.lock); | |
687 | platform_device_unregister(rbu_device); | |
688 | } | |
689 | ||
690 | module_exit(dcdrbu_exit); | |
691 | module_init(dcdrbu_init); |