Commit | Line | Data |
---|---|---|
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 | ||
dda8577f | 88 | static void init_packet_head(void) |
6c54c28e AS |
89 | { |
90 | INIT_LIST_HEAD(&packet_data_head.list); | |
91 | rbu_data.packet_write_count = 0; | |
92 | rbu_data.packet_read_count = 0; | |
93 | rbu_data.num_packets = 0; | |
94 | rbu_data.packetsize = 0; | |
95 | } | |
96 | ||
dda8577f | 97 | static int fill_last_packet(void *data, size_t length) |
6c54c28e AS |
98 | { |
99 | struct list_head *ptemp_list; | |
100 | struct packet_data *packet = NULL; | |
101 | int packet_count = 0; | |
102 | ||
103 | pr_debug("fill_last_packet: entry \n"); | |
104 | ||
105 | if (!rbu_data.num_packets) { | |
106 | pr_debug("fill_last_packet: num_packets=0\n"); | |
107 | return -ENOMEM; | |
108 | } | |
109 | ||
110 | packet_count = rbu_data.num_packets; | |
111 | ||
112 | ptemp_list = (&packet_data_head.list)->prev; | |
113 | ||
114 | packet = list_entry(ptemp_list, struct packet_data, list); | |
115 | ||
116 | if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) { | |
117 | pr_debug("dell_rbu:%s: packet size data " | |
e61c0e33 | 118 | "overrun\n", __FUNCTION__); |
6c54c28e AS |
119 | return -EINVAL; |
120 | } | |
121 | ||
122 | pr_debug("fill_last_packet : buffer = %p\n", packet->data); | |
123 | ||
124 | memcpy((packet->data + rbu_data.packet_write_count), data, length); | |
125 | ||
126 | if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) { | |
127 | /* | |
128 | * this was the last data chunk in the packet | |
129 | * so reinitialize the packet data counter to zero | |
130 | */ | |
131 | rbu_data.packet_write_count = 0; | |
132 | } else | |
133 | rbu_data.packet_write_count += length; | |
134 | ||
135 | pr_debug("fill_last_packet: exit \n"); | |
136 | return 0; | |
137 | } | |
138 | ||
dda8577f | 139 | static int create_packet(size_t length) |
6c54c28e AS |
140 | { |
141 | struct packet_data *newpacket; | |
142 | int ordernum = 0; | |
143 | ||
144 | pr_debug("create_packet: entry \n"); | |
145 | ||
146 | if (!rbu_data.packetsize) { | |
147 | pr_debug("create_packet: packetsize not specified\n"); | |
148 | return -EINVAL; | |
149 | } | |
e61c0e33 AS |
150 | spin_unlock(&rbu_data.lock); |
151 | newpacket = kmalloc(sizeof (struct packet_data), GFP_KERNEL); | |
152 | spin_lock(&rbu_data.lock); | |
6c54c28e | 153 | |
6c54c28e AS |
154 | if (!newpacket) { |
155 | printk(KERN_WARNING | |
e61c0e33 AS |
156 | "dell_rbu:%s: failed to allocate new " |
157 | "packet\n", __FUNCTION__); | |
6c54c28e AS |
158 | return -ENOMEM; |
159 | } | |
160 | ||
161 | ordernum = get_order(length); | |
162 | /* | |
163 | * there is no upper limit on memory | |
164 | * address for packetized mechanism | |
165 | */ | |
e61c0e33 AS |
166 | spin_unlock(&rbu_data.lock); |
167 | newpacket->data = (unsigned char *) __get_free_pages(GFP_KERNEL, | |
168 | ordernum); | |
169 | spin_lock(&rbu_data.lock); | |
6c54c28e AS |
170 | |
171 | pr_debug("create_packet: newpacket %p\n", newpacket->data); | |
172 | ||
173 | if (!newpacket->data) { | |
174 | printk(KERN_WARNING | |
e61c0e33 AS |
175 | "dell_rbu:%s: failed to allocate new " |
176 | "packet\n", __FUNCTION__); | |
6c54c28e AS |
177 | kfree(newpacket); |
178 | return -ENOMEM; | |
179 | } | |
180 | ||
181 | newpacket->ordernum = ordernum; | |
182 | ++rbu_data.num_packets; | |
183 | /* | |
184 | * initialize the newly created packet headers | |
185 | */ | |
186 | INIT_LIST_HEAD(&newpacket->list); | |
187 | list_add_tail(&newpacket->list, &packet_data_head.list); | |
188 | /* | |
189 | * packets have fixed size | |
190 | */ | |
191 | newpacket->length = rbu_data.packetsize; | |
192 | ||
193 | pr_debug("create_packet: exit \n"); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
dda8577f | 198 | static int packetize_data(void *data, size_t length) |
6c54c28e AS |
199 | { |
200 | int rc = 0; | |
201 | ||
202 | if (!rbu_data.packet_write_count) { | |
203 | if ((rc = create_packet(length))) | |
204 | return rc; | |
205 | } | |
206 | if ((rc = fill_last_packet(data, length))) | |
207 | return rc; | |
208 | ||
209 | return rc; | |
210 | } | |
211 | ||
dda8577f | 212 | static int do_packet_read(char *data, struct list_head *ptemp_list, |
e61c0e33 | 213 | int length, int bytes_read, int *list_read_count) |
6c54c28e AS |
214 | { |
215 | void *ptemp_buf; | |
216 | struct packet_data *newpacket = NULL; | |
217 | int bytes_copied = 0; | |
218 | int j = 0; | |
219 | ||
220 | newpacket = list_entry(ptemp_list, struct packet_data, list); | |
221 | *list_read_count += newpacket->length; | |
222 | ||
223 | if (*list_read_count > bytes_read) { | |
224 | /* point to the start of unread data */ | |
225 | j = newpacket->length - (*list_read_count - bytes_read); | |
226 | /* point to the offset in the packet buffer */ | |
227 | ptemp_buf = (u8 *) newpacket->data + j; | |
228 | /* | |
229 | * check if there is enough room in | |
230 | * * the incoming buffer | |
231 | */ | |
232 | if (length > (*list_read_count - bytes_read)) | |
233 | /* | |
234 | * copy what ever is there in this | |
235 | * packet and move on | |
236 | */ | |
237 | bytes_copied = (*list_read_count - bytes_read); | |
238 | else | |
239 | /* copy the remaining */ | |
240 | bytes_copied = length; | |
241 | memcpy(data, ptemp_buf, bytes_copied); | |
242 | } | |
243 | return bytes_copied; | |
244 | } | |
245 | ||
dda8577f | 246 | static int packet_read_list(char *data, size_t *pread_length) |
6c54c28e AS |
247 | { |
248 | struct list_head *ptemp_list; | |
249 | int temp_count = 0; | |
250 | int bytes_copied = 0; | |
251 | int bytes_read = 0; | |
252 | int remaining_bytes = 0; | |
253 | char *pdest = data; | |
254 | ||
255 | /* check if we have any packets */ | |
256 | if (0 == rbu_data.num_packets) | |
257 | return -ENOMEM; | |
258 | ||
259 | remaining_bytes = *pread_length; | |
260 | bytes_read = rbu_data.packet_read_count; | |
261 | ||
262 | ptemp_list = (&packet_data_head.list)->next; | |
263 | while (!list_empty(ptemp_list)) { | |
264 | bytes_copied = do_packet_read(pdest, ptemp_list, | |
e61c0e33 | 265 | remaining_bytes, bytes_read, &temp_count); |
6c54c28e AS |
266 | remaining_bytes -= bytes_copied; |
267 | bytes_read += bytes_copied; | |
268 | pdest += bytes_copied; | |
269 | /* | |
270 | * check if we reached end of buffer before reaching the | |
271 | * last packet | |
272 | */ | |
273 | if (remaining_bytes == 0) | |
274 | break; | |
275 | ||
276 | ptemp_list = ptemp_list->next; | |
277 | } | |
278 | /*finally set the bytes read */ | |
279 | *pread_length = bytes_read - rbu_data.packet_read_count; | |
280 | rbu_data.packet_read_count = bytes_read; | |
281 | return 0; | |
282 | } | |
283 | ||
dda8577f | 284 | static void packet_empty_list(void) |
6c54c28e AS |
285 | { |
286 | struct list_head *ptemp_list; | |
287 | struct list_head *pnext_list; | |
288 | struct packet_data *newpacket; | |
289 | ||
290 | ptemp_list = (&packet_data_head.list)->next; | |
291 | while (!list_empty(ptemp_list)) { | |
292 | newpacket = | |
e61c0e33 | 293 | list_entry(ptemp_list, struct packet_data, list); |
6c54c28e AS |
294 | pnext_list = ptemp_list->next; |
295 | list_del(ptemp_list); | |
296 | ptemp_list = pnext_list; | |
297 | /* | |
298 | * zero out the RBU packet memory before freeing | |
299 | * to make sure there are no stale RBU packets left in memory | |
300 | */ | |
301 | memset(newpacket->data, 0, rbu_data.packetsize); | |
e61c0e33 AS |
302 | free_pages((unsigned long) newpacket->data, |
303 | newpacket->ordernum); | |
6c54c28e AS |
304 | kfree(newpacket); |
305 | } | |
306 | rbu_data.packet_write_count = 0; | |
307 | rbu_data.packet_read_count = 0; | |
308 | rbu_data.num_packets = 0; | |
309 | rbu_data.packetsize = 0; | |
310 | } | |
311 | ||
312 | /* | |
313 | * img_update_free: Frees the buffer allocated for storing BIOS image | |
314 | * Always called with lock held and returned with lock held | |
315 | */ | |
dda8577f | 316 | static void img_update_free(void) |
6c54c28e AS |
317 | { |
318 | if (!rbu_data.image_update_buffer) | |
319 | return; | |
320 | /* | |
321 | * zero out this buffer before freeing it to get rid of any stale | |
322 | * BIOS image copied in memory. | |
323 | */ | |
324 | memset(rbu_data.image_update_buffer, 0, | |
e61c0e33 | 325 | rbu_data.image_update_buffer_size); |
6c54c28e AS |
326 | if (rbu_data.dma_alloc == 1) |
327 | dma_free_coherent(NULL, rbu_data.bios_image_size, | |
e61c0e33 | 328 | rbu_data.image_update_buffer, dell_rbu_dmaaddr); |
6c54c28e | 329 | else |
e61c0e33 AS |
330 | free_pages((unsigned long) rbu_data.image_update_buffer, |
331 | rbu_data.image_update_ordernum); | |
6c54c28e AS |
332 | |
333 | /* | |
334 | * Re-initialize the rbu_data variables after a free | |
335 | */ | |
336 | rbu_data.image_update_ordernum = -1; | |
337 | rbu_data.image_update_buffer = NULL; | |
338 | rbu_data.image_update_buffer_size = 0; | |
339 | rbu_data.bios_image_size = 0; | |
340 | rbu_data.dma_alloc = 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * img_update_realloc: This function allocates the contiguous pages to | |
345 | * accommodate the requested size of data. The memory address and size | |
346 | * values are stored globally and on every call to this function the new | |
347 | * size is checked to see if more data is required than the existing size. | |
348 | * If true the previous memory is freed and new allocation is done to | |
349 | * accommodate the new size. If the incoming size is less then than the | |
350 | * already allocated size, then that memory is reused. This function is | |
351 | * called with lock held and returns with lock held. | |
352 | */ | |
dda8577f | 353 | static int img_update_realloc(unsigned long size) |
6c54c28e AS |
354 | { |
355 | unsigned char *image_update_buffer = NULL; | |
356 | unsigned long rc; | |
357 | unsigned long img_buf_phys_addr; | |
358 | int ordernum; | |
359 | int dma_alloc = 0; | |
360 | ||
361 | /* | |
362 | * check if the buffer of sufficient size has been | |
363 | * already allocated | |
364 | */ | |
365 | if (rbu_data.image_update_buffer_size >= size) { | |
366 | /* | |
367 | * check for corruption | |
368 | */ | |
369 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { | |
370 | printk(KERN_ERR "dell_rbu:%s: corruption " | |
e61c0e33 | 371 | "check failed\n", __FUNCTION__); |
6c54c28e AS |
372 | return -EINVAL; |
373 | } | |
374 | /* | |
375 | * we have a valid pre-allocated buffer with | |
376 | * sufficient size | |
377 | */ | |
378 | return 0; | |
379 | } | |
380 | ||
381 | /* | |
382 | * free any previously allocated buffer | |
383 | */ | |
384 | img_update_free(); | |
385 | ||
386 | spin_unlock(&rbu_data.lock); | |
387 | ||
388 | ordernum = get_order(size); | |
389 | image_update_buffer = | |
e61c0e33 | 390 | (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum); |
6c54c28e AS |
391 | |
392 | img_buf_phys_addr = | |
e61c0e33 | 393 | (unsigned long) virt_to_phys(image_update_buffer); |
6c54c28e AS |
394 | |
395 | if (img_buf_phys_addr > BIOS_SCAN_LIMIT) { | |
e61c0e33 | 396 | free_pages((unsigned long) image_update_buffer, ordernum); |
6c54c28e AS |
397 | ordernum = -1; |
398 | image_update_buffer = dma_alloc_coherent(NULL, size, | |
e61c0e33 | 399 | &dell_rbu_dmaaddr, GFP_KERNEL); |
6c54c28e AS |
400 | dma_alloc = 1; |
401 | } | |
402 | ||
403 | spin_lock(&rbu_data.lock); | |
404 | ||
405 | if (image_update_buffer != NULL) { | |
406 | rbu_data.image_update_buffer = image_update_buffer; | |
407 | rbu_data.image_update_buffer_size = size; | |
408 | rbu_data.bios_image_size = | |
e61c0e33 | 409 | rbu_data.image_update_buffer_size; |
6c54c28e AS |
410 | rbu_data.image_update_ordernum = ordernum; |
411 | rbu_data.dma_alloc = dma_alloc; | |
412 | rc = 0; | |
413 | } else { | |
414 | pr_debug("Not enough memory for image update:" | |
e61c0e33 | 415 | "size = %ld\n", size); |
6c54c28e AS |
416 | rc = -ENOMEM; |
417 | } | |
418 | ||
419 | return rc; | |
420 | } | |
421 | ||
dda8577f | 422 | static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
423 | { |
424 | int retval; | |
425 | size_t bytes_left; | |
426 | size_t data_length; | |
427 | char *ptempBuf = buffer; | |
428 | unsigned long imagesize; | |
429 | ||
430 | /* check to see if we have something to return */ | |
431 | if (rbu_data.num_packets == 0) { | |
432 | pr_debug("read_packet_data: no packets written\n"); | |
433 | retval = -ENOMEM; | |
434 | goto read_rbu_data_exit; | |
435 | } | |
436 | ||
437 | imagesize = rbu_data.num_packets * rbu_data.packetsize; | |
438 | ||
439 | if (pos > imagesize) { | |
440 | retval = 0; | |
441 | printk(KERN_WARNING "dell_rbu:read_packet_data: " | |
e61c0e33 | 442 | "data underrun\n"); |
6c54c28e AS |
443 | goto read_rbu_data_exit; |
444 | } | |
445 | ||
446 | bytes_left = imagesize - pos; | |
447 | data_length = min(bytes_left, count); | |
448 | ||
449 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) | |
450 | goto read_rbu_data_exit; | |
451 | ||
452 | if ((pos + count) > imagesize) { | |
453 | rbu_data.packet_read_count = 0; | |
454 | /* this was the last copy */ | |
455 | retval = bytes_left; | |
456 | } else | |
457 | retval = count; | |
458 | ||
459 | read_rbu_data_exit: | |
460 | return retval; | |
461 | } | |
462 | ||
dda8577f | 463 | static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
464 | { |
465 | unsigned char *ptemp = NULL; | |
466 | size_t bytes_left = 0; | |
467 | size_t data_length = 0; | |
468 | ssize_t ret_count = 0; | |
469 | ||
470 | /* check to see if we have something to return */ | |
471 | if ((rbu_data.image_update_buffer == NULL) || | |
e61c0e33 | 472 | (rbu_data.bios_image_size == 0)) { |
6c54c28e | 473 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
e61c0e33 AS |
474 | "bios_image_size %lu\n", |
475 | rbu_data.image_update_buffer, | |
476 | rbu_data.bios_image_size); | |
6c54c28e AS |
477 | ret_count = -ENOMEM; |
478 | goto read_rbu_data_exit; | |
479 | } | |
480 | ||
481 | if (pos > rbu_data.bios_image_size) { | |
482 | ret_count = 0; | |
483 | goto read_rbu_data_exit; | |
484 | } | |
485 | ||
486 | bytes_left = rbu_data.bios_image_size - pos; | |
487 | data_length = min(bytes_left, count); | |
488 | ||
489 | ptemp = rbu_data.image_update_buffer; | |
490 | memcpy(buffer, (ptemp + pos), data_length); | |
491 | ||
492 | if ((pos + count) > rbu_data.bios_image_size) | |
493 | /* this was the last copy */ | |
494 | ret_count = bytes_left; | |
495 | else | |
496 | ret_count = count; | |
497 | read_rbu_data_exit: | |
498 | return ret_count; | |
499 | } | |
500 | ||
dda8577f AM |
501 | static ssize_t read_rbu_data(struct kobject *kobj, char *buffer, |
502 | loff_t pos, size_t count) | |
6c54c28e AS |
503 | { |
504 | ssize_t ret_count = 0; | |
505 | ||
506 | spin_lock(&rbu_data.lock); | |
507 | ||
508 | if (!strcmp(image_type, "mono")) | |
509 | ret_count = read_rbu_mono_data(buffer, pos, count); | |
510 | else if (!strcmp(image_type, "packet")) | |
511 | ret_count = read_packet_data(buffer, pos, count); | |
512 | else | |
513 | pr_debug("read_rbu_data: invalid image type specified\n"); | |
514 | ||
515 | spin_unlock(&rbu_data.lock); | |
516 | return ret_count; | |
517 | } | |
518 | ||
dda8577f | 519 | static void callbackfn_rbu(const struct firmware *fw, void *context) |
e61c0e33 AS |
520 | { |
521 | int rc = 0; | |
522 | ||
523 | if (!fw || !fw->size) { | |
524 | rbu_data.entry_created = 0; | |
525 | return; | |
526 | } | |
527 | ||
528 | spin_lock(&rbu_data.lock); | |
529 | if (!strcmp(image_type, "mono")) { | |
530 | if (!img_update_realloc(fw->size)) | |
531 | memcpy(rbu_data.image_update_buffer, | |
532 | fw->data, fw->size); | |
533 | } else if (!strcmp(image_type, "packet")) { | |
534 | if (!rbu_data.packetsize) | |
535 | rbu_data.packetsize = fw->size; | |
536 | else if (rbu_data.packetsize != fw->size) { | |
537 | packet_empty_list(); | |
538 | rbu_data.packetsize = fw->size; | |
539 | } | |
540 | packetize_data(fw->data, fw->size); | |
541 | } else | |
542 | pr_debug("invalid image type specified.\n"); | |
543 | spin_unlock(&rbu_data.lock); | |
544 | ||
545 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, | |
546 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); | |
547 | if (rc) | |
548 | printk(KERN_ERR | |
549 | "dell_rbu:%s request_firmware_nowait failed" | |
550 | " %d\n", __FUNCTION__, rc); | |
551 | else | |
552 | rbu_data.entry_created = 1; | |
553 | } | |
554 | ||
dda8577f AM |
555 | static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer, |
556 | loff_t pos, size_t count) | |
6c54c28e AS |
557 | { |
558 | int size = 0; | |
559 | if (!pos) | |
560 | size = sprintf(buffer, "%s\n", image_type); | |
561 | return size; | |
562 | } | |
563 | ||
dda8577f AM |
564 | static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer, |
565 | loff_t pos, size_t count) | |
6c54c28e AS |
566 | { |
567 | int rc = count; | |
e61c0e33 AS |
568 | int req_firm_rc = 0; |
569 | int i; | |
6c54c28e | 570 | spin_lock(&rbu_data.lock); |
e61c0e33 AS |
571 | /* |
572 | * Find the first newline or space | |
573 | */ | |
574 | for (i = 0; i < count; ++i) | |
575 | if (buffer[i] == '\n' || buffer[i] == ' ') { | |
576 | buffer[i] = '\0'; | |
577 | break; | |
578 | } | |
579 | if (i == count) | |
580 | buffer[count] = '\0'; | |
581 | ||
582 | if (strstr(buffer, "mono")) | |
583 | strcpy(image_type, "mono"); | |
584 | else if (strstr(buffer, "packet")) | |
585 | strcpy(image_type, "packet"); | |
586 | else if (strstr(buffer, "init")) { | |
587 | /* | |
588 | * If due to the user error the driver gets in a bad | |
589 | * state where even though it is loaded , the | |
590 | * /sys/class/firmware/dell_rbu entries are missing. | |
591 | * to cover this situation the user can recreate entries | |
592 | * by writing init to image_type. | |
593 | */ | |
594 | if (!rbu_data.entry_created) { | |
595 | spin_unlock(&rbu_data.lock); | |
596 | req_firm_rc = request_firmware_nowait(THIS_MODULE, | |
597 | FW_ACTION_NOHOTPLUG, "dell_rbu", | |
598 | &rbu_device->dev, &context, | |
599 | callbackfn_rbu); | |
600 | if (req_firm_rc) { | |
601 | printk(KERN_ERR | |
602 | "dell_rbu:%s request_firmware_nowait" | |
603 | " failed %d\n", __FUNCTION__, rc); | |
604 | rc = -EIO; | |
605 | } else | |
606 | rbu_data.entry_created = 1; | |
607 | ||
608 | spin_lock(&rbu_data.lock); | |
609 | } | |
610 | } else { | |
611 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); | |
612 | spin_unlock(&rbu_data.lock); | |
613 | return -EINVAL; | |
614 | } | |
6c54c28e AS |
615 | |
616 | /* we must free all previous allocations */ | |
617 | packet_empty_list(); | |
618 | img_update_free(); | |
6c54c28e | 619 | spin_unlock(&rbu_data.lock); |
6c54c28e | 620 | |
e61c0e33 | 621 | return rc; |
6c54c28e AS |
622 | } |
623 | ||
624 | static struct bin_attribute rbu_data_attr = { | |
dda8577f AM |
625 | .attr = { |
626 | .name = "data", | |
627 | .owner = THIS_MODULE, | |
628 | .mode = 0444, | |
629 | }, | |
6c54c28e AS |
630 | .read = read_rbu_data, |
631 | }; | |
632 | ||
633 | static struct bin_attribute rbu_image_type_attr = { | |
dda8577f AM |
634 | .attr = { |
635 | .name = "image_type", | |
636 | .owner = THIS_MODULE, | |
637 | .mode = 0644, | |
638 | }, | |
6c54c28e AS |
639 | .read = read_rbu_image_type, |
640 | .write = write_rbu_image_type, | |
641 | }; | |
642 | ||
dda8577f | 643 | static int __init dcdrbu_init(void) |
6c54c28e AS |
644 | { |
645 | int rc = 0; | |
646 | spin_lock_init(&rbu_data.lock); | |
647 | ||
648 | init_packet_head(); | |
649 | rbu_device = | |
e61c0e33 | 650 | platform_device_register_simple("dell_rbu", -1, NULL, 0); |
6c54c28e AS |
651 | if (!rbu_device) { |
652 | printk(KERN_ERR | |
e61c0e33 AS |
653 | "dell_rbu:%s:platform_device_register_simple " |
654 | "failed\n", __FUNCTION__); | |
6c54c28e AS |
655 | return -EIO; |
656 | } | |
657 | ||
658 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); | |
659 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
660 | ||
661 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, | |
e61c0e33 | 662 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); |
6c54c28e AS |
663 | if (rc) |
664 | printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait" | |
e61c0e33 AS |
665 | " failed %d\n", __FUNCTION__, rc); |
666 | else | |
667 | rbu_data.entry_created = 1; | |
6c54c28e AS |
668 | |
669 | return rc; | |
670 | ||
671 | } | |
672 | ||
dda8577f | 673 | static __exit void dcdrbu_exit(void) |
6c54c28e AS |
674 | { |
675 | spin_lock(&rbu_data.lock); | |
676 | packet_empty_list(); | |
677 | img_update_free(); | |
678 | spin_unlock(&rbu_data.lock); | |
679 | platform_device_unregister(rbu_device); | |
680 | } | |
681 | ||
682 | module_exit(dcdrbu_exit); | |
683 | module_init(dcdrbu_init); |