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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 | */ | |
6c54c28e AS |
37 | #include <linux/config.h> |
38 | #include <linux/init.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/blkdev.h> | |
d052d1be | 43 | #include <linux/platform_device.h> |
6c54c28e AS |
44 | #include <linux/spinlock.h> |
45 | #include <linux/moduleparam.h> | |
46 | #include <linux/firmware.h> | |
47 | #include <linux/dma-mapping.h> | |
48 | ||
49 | MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>"); | |
50 | MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); | |
51 | MODULE_LICENSE("GPL"); | |
274b6933 | 52 | MODULE_VERSION("3.1"); |
6c54c28e AS |
53 | |
54 | #define BIOS_SCAN_LIMIT 0xffffffff | |
55 | #define MAX_IMAGE_LENGTH 16 | |
56 | static struct _rbu_data { | |
57 | void *image_update_buffer; | |
58 | unsigned long image_update_buffer_size; | |
59 | unsigned long bios_image_size; | |
60 | int image_update_ordernum; | |
61 | int dma_alloc; | |
62 | spinlock_t lock; | |
63 | unsigned long packet_read_count; | |
6c54c28e AS |
64 | unsigned long num_packets; |
65 | unsigned long packetsize; | |
ad6ce87e | 66 | unsigned long imagesize; |
e61c0e33 | 67 | int entry_created; |
6c54c28e AS |
68 | } rbu_data; |
69 | ||
e61c0e33 AS |
70 | static char image_type[MAX_IMAGE_LENGTH + 1] = "mono"; |
71 | module_param_string(image_type, image_type, sizeof (image_type), 0); | |
ad6ce87e AS |
72 | MODULE_PARM_DESC(image_type, |
73 | "BIOS image type. choose- mono or packet or init"); | |
6c54c28e | 74 | |
274b6933 AS |
75 | static unsigned long allocation_floor = 0x100000; |
76 | module_param(allocation_floor, ulong, 0644); | |
77 | MODULE_PARM_DESC(allocation_floor, | |
78 | "Minimum address for allocations when using Packet mode"); | |
79 | ||
6c54c28e AS |
80 | struct packet_data { |
81 | struct list_head list; | |
82 | size_t length; | |
83 | void *data; | |
84 | int ordernum; | |
85 | }; | |
86 | ||
87 | static struct packet_data packet_data_head; | |
88 | ||
89 | static struct platform_device *rbu_device; | |
90 | static int context; | |
91 | static dma_addr_t dell_rbu_dmaaddr; | |
92 | ||
dda8577f | 93 | static void init_packet_head(void) |
6c54c28e AS |
94 | { |
95 | INIT_LIST_HEAD(&packet_data_head.list); | |
6c54c28e AS |
96 | rbu_data.packet_read_count = 0; |
97 | rbu_data.num_packets = 0; | |
98 | rbu_data.packetsize = 0; | |
ad6ce87e | 99 | rbu_data.imagesize = 0; |
6c54c28e AS |
100 | } |
101 | ||
ad6ce87e | 102 | static int create_packet(void *data, size_t length) |
6c54c28e AS |
103 | { |
104 | struct packet_data *newpacket; | |
105 | int ordernum = 0; | |
274b6933 AS |
106 | int retval = 0; |
107 | unsigned int packet_array_size = 0; | |
5ad9201b AV |
108 | void **invalid_addr_packet_array = NULL; |
109 | void *packet_data_temp_buf = NULL; | |
274b6933 | 110 | unsigned int idx = 0; |
6c54c28e AS |
111 | |
112 | pr_debug("create_packet: entry \n"); | |
113 | ||
114 | if (!rbu_data.packetsize) { | |
115 | pr_debug("create_packet: packetsize not specified\n"); | |
274b6933 AS |
116 | retval = -EINVAL; |
117 | goto out_noalloc; | |
6c54c28e | 118 | } |
274b6933 | 119 | |
e61c0e33 | 120 | spin_unlock(&rbu_data.lock); |
274b6933 AS |
121 | |
122 | newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL); | |
6c54c28e | 123 | |
6c54c28e AS |
124 | if (!newpacket) { |
125 | printk(KERN_WARNING | |
e61c0e33 AS |
126 | "dell_rbu:%s: failed to allocate new " |
127 | "packet\n", __FUNCTION__); | |
274b6933 AS |
128 | retval = -ENOMEM; |
129 | spin_lock(&rbu_data.lock); | |
130 | goto out_noalloc; | |
6c54c28e AS |
131 | } |
132 | ||
133 | ordernum = get_order(length); | |
274b6933 | 134 | |
6c54c28e | 135 | /* |
274b6933 AS |
136 | * BIOS errata mean we cannot allocate packets below 1MB or they will |
137 | * be overwritten by BIOS. | |
138 | * | |
139 | * array to temporarily hold packets | |
140 | * that are below the allocation floor | |
141 | * | |
142 | * NOTE: very simplistic because we only need the floor to be at 1MB | |
143 | * due to BIOS errata. This shouldn't be used for higher floors | |
144 | * or you will run out of mem trying to allocate the array. | |
6c54c28e | 145 | */ |
274b6933 AS |
146 | packet_array_size = max( |
147 | (unsigned int)(allocation_floor / rbu_data.packetsize), | |
148 | (unsigned int)1); | |
149 | invalid_addr_packet_array = kzalloc(packet_array_size * sizeof(void*), | |
150 | GFP_KERNEL); | |
6c54c28e | 151 | |
274b6933 | 152 | if (!invalid_addr_packet_array) { |
6c54c28e | 153 | printk(KERN_WARNING |
274b6933 AS |
154 | "dell_rbu:%s: failed to allocate " |
155 | "invalid_addr_packet_array \n", | |
156 | __FUNCTION__); | |
157 | retval = -ENOMEM; | |
158 | spin_lock(&rbu_data.lock); | |
159 | goto out_alloc_packet; | |
6c54c28e AS |
160 | } |
161 | ||
274b6933 AS |
162 | while (!packet_data_temp_buf) { |
163 | packet_data_temp_buf = (unsigned char *) | |
164 | __get_free_pages(GFP_KERNEL, ordernum); | |
165 | if (!packet_data_temp_buf) { | |
166 | printk(KERN_WARNING | |
167 | "dell_rbu:%s: failed to allocate new " | |
168 | "packet\n", __FUNCTION__); | |
169 | retval = -ENOMEM; | |
170 | spin_lock(&rbu_data.lock); | |
171 | goto out_alloc_packet_array; | |
172 | } | |
173 | ||
174 | if ((unsigned long)virt_to_phys(packet_data_temp_buf) | |
175 | < allocation_floor) { | |
176 | pr_debug("packet 0x%lx below floor at 0x%lx.\n", | |
177 | (unsigned long)virt_to_phys( | |
178 | packet_data_temp_buf), | |
179 | allocation_floor); | |
180 | invalid_addr_packet_array[idx++] = packet_data_temp_buf; | |
5ad9201b | 181 | packet_data_temp_buf = NULL; |
274b6933 AS |
182 | } |
183 | } | |
184 | spin_lock(&rbu_data.lock); | |
185 | ||
186 | newpacket->data = packet_data_temp_buf; | |
187 | ||
188 | pr_debug("create_packet: newpacket at physical addr %lx\n", | |
189 | (unsigned long)virt_to_phys(newpacket->data)); | |
190 | ||
191 | /* packets may not have fixed size */ | |
192 | newpacket->length = length; | |
6c54c28e AS |
193 | newpacket->ordernum = ordernum; |
194 | ++rbu_data.num_packets; | |
274b6933 AS |
195 | |
196 | /* initialize the newly created packet headers */ | |
6c54c28e AS |
197 | INIT_LIST_HEAD(&newpacket->list); |
198 | list_add_tail(&newpacket->list, &packet_data_head.list); | |
ad6ce87e AS |
199 | |
200 | memcpy(newpacket->data, data, length); | |
6c54c28e AS |
201 | |
202 | pr_debug("create_packet: exit \n"); | |
203 | ||
274b6933 AS |
204 | out_alloc_packet_array: |
205 | /* always free packet array */ | |
206 | for (;idx>0;idx--) { | |
207 | pr_debug("freeing unused packet below floor 0x%lx.\n", | |
208 | (unsigned long)virt_to_phys( | |
209 | invalid_addr_packet_array[idx-1])); | |
210 | free_pages((unsigned long)invalid_addr_packet_array[idx-1], | |
211 | ordernum); | |
212 | } | |
213 | kfree(invalid_addr_packet_array); | |
214 | ||
215 | out_alloc_packet: | |
216 | /* if error, free data */ | |
217 | if (retval) | |
218 | kfree(newpacket); | |
219 | ||
220 | out_noalloc: | |
221 | return retval; | |
6c54c28e AS |
222 | } |
223 | ||
dda8577f | 224 | static int packetize_data(void *data, size_t length) |
6c54c28e AS |
225 | { |
226 | int rc = 0; | |
ad6ce87e AS |
227 | int done = 0; |
228 | int packet_length; | |
229 | u8 *temp; | |
230 | u8 *end = (u8 *) data + length; | |
231 | pr_debug("packetize_data: data length %d\n", length); | |
232 | if (!rbu_data.packetsize) { | |
233 | printk(KERN_WARNING | |
234 | "dell_rbu: packetsize not specified\n"); | |
235 | return -EIO; | |
236 | } | |
6c54c28e | 237 | |
ad6ce87e AS |
238 | temp = (u8 *) data; |
239 | ||
240 | /* packetize the hunk */ | |
241 | while (!done) { | |
242 | if ((temp + rbu_data.packetsize) < end) | |
243 | packet_length = rbu_data.packetsize; | |
244 | else { | |
245 | /* this is the last packet */ | |
246 | packet_length = end - temp; | |
247 | done = 1; | |
248 | } | |
249 | ||
250 | if ((rc = create_packet(temp, packet_length))) | |
6c54c28e | 251 | return rc; |
ad6ce87e AS |
252 | |
253 | pr_debug("%lu:%lu\n", temp, (end - temp)); | |
254 | temp += packet_length; | |
6c54c28e | 255 | } |
ad6ce87e AS |
256 | |
257 | rbu_data.imagesize = length; | |
6c54c28e AS |
258 | |
259 | return rc; | |
260 | } | |
261 | ||
dda8577f | 262 | static int do_packet_read(char *data, struct list_head *ptemp_list, |
e61c0e33 | 263 | int length, int bytes_read, int *list_read_count) |
6c54c28e AS |
264 | { |
265 | void *ptemp_buf; | |
266 | struct packet_data *newpacket = NULL; | |
267 | int bytes_copied = 0; | |
268 | int j = 0; | |
269 | ||
270 | newpacket = list_entry(ptemp_list, struct packet_data, list); | |
271 | *list_read_count += newpacket->length; | |
272 | ||
273 | if (*list_read_count > bytes_read) { | |
274 | /* point to the start of unread data */ | |
275 | j = newpacket->length - (*list_read_count - bytes_read); | |
276 | /* point to the offset in the packet buffer */ | |
277 | ptemp_buf = (u8 *) newpacket->data + j; | |
278 | /* | |
279 | * check if there is enough room in | |
280 | * * the incoming buffer | |
281 | */ | |
282 | if (length > (*list_read_count - bytes_read)) | |
283 | /* | |
284 | * copy what ever is there in this | |
285 | * packet and move on | |
286 | */ | |
287 | bytes_copied = (*list_read_count - bytes_read); | |
288 | else | |
289 | /* copy the remaining */ | |
290 | bytes_copied = length; | |
291 | memcpy(data, ptemp_buf, bytes_copied); | |
292 | } | |
293 | return bytes_copied; | |
294 | } | |
295 | ||
ad6ce87e | 296 | static int packet_read_list(char *data, size_t * pread_length) |
6c54c28e AS |
297 | { |
298 | struct list_head *ptemp_list; | |
299 | int temp_count = 0; | |
300 | int bytes_copied = 0; | |
301 | int bytes_read = 0; | |
302 | int remaining_bytes = 0; | |
303 | char *pdest = data; | |
304 | ||
305 | /* check if we have any packets */ | |
306 | if (0 == rbu_data.num_packets) | |
307 | return -ENOMEM; | |
308 | ||
309 | remaining_bytes = *pread_length; | |
310 | bytes_read = rbu_data.packet_read_count; | |
311 | ||
312 | ptemp_list = (&packet_data_head.list)->next; | |
313 | while (!list_empty(ptemp_list)) { | |
314 | bytes_copied = do_packet_read(pdest, ptemp_list, | |
e61c0e33 | 315 | remaining_bytes, bytes_read, &temp_count); |
6c54c28e AS |
316 | remaining_bytes -= bytes_copied; |
317 | bytes_read += bytes_copied; | |
318 | pdest += bytes_copied; | |
319 | /* | |
320 | * check if we reached end of buffer before reaching the | |
321 | * last packet | |
322 | */ | |
323 | if (remaining_bytes == 0) | |
324 | break; | |
325 | ||
326 | ptemp_list = ptemp_list->next; | |
327 | } | |
328 | /*finally set the bytes read */ | |
329 | *pread_length = bytes_read - rbu_data.packet_read_count; | |
330 | rbu_data.packet_read_count = bytes_read; | |
331 | return 0; | |
332 | } | |
333 | ||
dda8577f | 334 | static void packet_empty_list(void) |
6c54c28e AS |
335 | { |
336 | struct list_head *ptemp_list; | |
337 | struct list_head *pnext_list; | |
338 | struct packet_data *newpacket; | |
339 | ||
340 | ptemp_list = (&packet_data_head.list)->next; | |
341 | while (!list_empty(ptemp_list)) { | |
342 | newpacket = | |
e61c0e33 | 343 | list_entry(ptemp_list, struct packet_data, list); |
6c54c28e AS |
344 | pnext_list = ptemp_list->next; |
345 | list_del(ptemp_list); | |
346 | ptemp_list = pnext_list; | |
347 | /* | |
348 | * zero out the RBU packet memory before freeing | |
349 | * to make sure there are no stale RBU packets left in memory | |
350 | */ | |
351 | memset(newpacket->data, 0, rbu_data.packetsize); | |
e61c0e33 AS |
352 | free_pages((unsigned long) newpacket->data, |
353 | newpacket->ordernum); | |
6c54c28e AS |
354 | kfree(newpacket); |
355 | } | |
6c54c28e AS |
356 | rbu_data.packet_read_count = 0; |
357 | rbu_data.num_packets = 0; | |
ad6ce87e | 358 | rbu_data.imagesize = 0; |
6c54c28e AS |
359 | } |
360 | ||
361 | /* | |
362 | * img_update_free: Frees the buffer allocated for storing BIOS image | |
363 | * Always called with lock held and returned with lock held | |
364 | */ | |
dda8577f | 365 | static void img_update_free(void) |
6c54c28e AS |
366 | { |
367 | if (!rbu_data.image_update_buffer) | |
368 | return; | |
369 | /* | |
370 | * zero out this buffer before freeing it to get rid of any stale | |
371 | * BIOS image copied in memory. | |
372 | */ | |
373 | memset(rbu_data.image_update_buffer, 0, | |
e61c0e33 | 374 | rbu_data.image_update_buffer_size); |
6c54c28e AS |
375 | if (rbu_data.dma_alloc == 1) |
376 | dma_free_coherent(NULL, rbu_data.bios_image_size, | |
e61c0e33 | 377 | rbu_data.image_update_buffer, dell_rbu_dmaaddr); |
6c54c28e | 378 | else |
e61c0e33 AS |
379 | free_pages((unsigned long) rbu_data.image_update_buffer, |
380 | rbu_data.image_update_ordernum); | |
6c54c28e AS |
381 | |
382 | /* | |
383 | * Re-initialize the rbu_data variables after a free | |
384 | */ | |
385 | rbu_data.image_update_ordernum = -1; | |
386 | rbu_data.image_update_buffer = NULL; | |
387 | rbu_data.image_update_buffer_size = 0; | |
388 | rbu_data.bios_image_size = 0; | |
389 | rbu_data.dma_alloc = 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * img_update_realloc: This function allocates the contiguous pages to | |
394 | * accommodate the requested size of data. The memory address and size | |
395 | * values are stored globally and on every call to this function the new | |
396 | * size is checked to see if more data is required than the existing size. | |
397 | * If true the previous memory is freed and new allocation is done to | |
398 | * accommodate the new size. If the incoming size is less then than the | |
399 | * already allocated size, then that memory is reused. This function is | |
400 | * called with lock held and returns with lock held. | |
401 | */ | |
dda8577f | 402 | static int img_update_realloc(unsigned long size) |
6c54c28e AS |
403 | { |
404 | unsigned char *image_update_buffer = NULL; | |
405 | unsigned long rc; | |
406 | unsigned long img_buf_phys_addr; | |
407 | int ordernum; | |
408 | int dma_alloc = 0; | |
409 | ||
410 | /* | |
411 | * check if the buffer of sufficient size has been | |
412 | * already allocated | |
413 | */ | |
414 | if (rbu_data.image_update_buffer_size >= size) { | |
415 | /* | |
416 | * check for corruption | |
417 | */ | |
418 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { | |
419 | printk(KERN_ERR "dell_rbu:%s: corruption " | |
e61c0e33 | 420 | "check failed\n", __FUNCTION__); |
6c54c28e AS |
421 | return -EINVAL; |
422 | } | |
423 | /* | |
424 | * we have a valid pre-allocated buffer with | |
425 | * sufficient size | |
426 | */ | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /* | |
431 | * free any previously allocated buffer | |
432 | */ | |
433 | img_update_free(); | |
434 | ||
435 | spin_unlock(&rbu_data.lock); | |
436 | ||
437 | ordernum = get_order(size); | |
438 | image_update_buffer = | |
e61c0e33 | 439 | (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum); |
6c54c28e AS |
440 | |
441 | img_buf_phys_addr = | |
e61c0e33 | 442 | (unsigned long) virt_to_phys(image_update_buffer); |
6c54c28e AS |
443 | |
444 | if (img_buf_phys_addr > BIOS_SCAN_LIMIT) { | |
e61c0e33 | 445 | free_pages((unsigned long) image_update_buffer, ordernum); |
6c54c28e AS |
446 | ordernum = -1; |
447 | image_update_buffer = dma_alloc_coherent(NULL, size, | |
e61c0e33 | 448 | &dell_rbu_dmaaddr, GFP_KERNEL); |
6c54c28e AS |
449 | dma_alloc = 1; |
450 | } | |
451 | ||
452 | spin_lock(&rbu_data.lock); | |
453 | ||
454 | if (image_update_buffer != NULL) { | |
455 | rbu_data.image_update_buffer = image_update_buffer; | |
456 | rbu_data.image_update_buffer_size = size; | |
457 | rbu_data.bios_image_size = | |
e61c0e33 | 458 | rbu_data.image_update_buffer_size; |
6c54c28e AS |
459 | rbu_data.image_update_ordernum = ordernum; |
460 | rbu_data.dma_alloc = dma_alloc; | |
461 | rc = 0; | |
462 | } else { | |
463 | pr_debug("Not enough memory for image update:" | |
e61c0e33 | 464 | "size = %ld\n", size); |
6c54c28e AS |
465 | rc = -ENOMEM; |
466 | } | |
467 | ||
468 | return rc; | |
469 | } | |
470 | ||
dda8577f | 471 | static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
472 | { |
473 | int retval; | |
474 | size_t bytes_left; | |
475 | size_t data_length; | |
476 | char *ptempBuf = buffer; | |
6c54c28e AS |
477 | |
478 | /* check to see if we have something to return */ | |
479 | if (rbu_data.num_packets == 0) { | |
480 | pr_debug("read_packet_data: no packets written\n"); | |
481 | retval = -ENOMEM; | |
482 | goto read_rbu_data_exit; | |
483 | } | |
484 | ||
ad6ce87e | 485 | if (pos > rbu_data.imagesize) { |
6c54c28e AS |
486 | retval = 0; |
487 | printk(KERN_WARNING "dell_rbu:read_packet_data: " | |
e61c0e33 | 488 | "data underrun\n"); |
6c54c28e AS |
489 | goto read_rbu_data_exit; |
490 | } | |
491 | ||
ad6ce87e | 492 | bytes_left = rbu_data.imagesize - pos; |
6c54c28e AS |
493 | data_length = min(bytes_left, count); |
494 | ||
495 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) | |
496 | goto read_rbu_data_exit; | |
497 | ||
ad6ce87e | 498 | if ((pos + count) > rbu_data.imagesize) { |
6c54c28e AS |
499 | rbu_data.packet_read_count = 0; |
500 | /* this was the last copy */ | |
501 | retval = bytes_left; | |
502 | } else | |
503 | retval = count; | |
504 | ||
505 | read_rbu_data_exit: | |
506 | return retval; | |
507 | } | |
508 | ||
dda8577f | 509 | static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
510 | { |
511 | unsigned char *ptemp = NULL; | |
512 | size_t bytes_left = 0; | |
513 | size_t data_length = 0; | |
514 | ssize_t ret_count = 0; | |
515 | ||
516 | /* check to see if we have something to return */ | |
517 | if ((rbu_data.image_update_buffer == NULL) || | |
e61c0e33 | 518 | (rbu_data.bios_image_size == 0)) { |
6c54c28e | 519 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
e61c0e33 AS |
520 | "bios_image_size %lu\n", |
521 | rbu_data.image_update_buffer, | |
522 | rbu_data.bios_image_size); | |
6c54c28e AS |
523 | ret_count = -ENOMEM; |
524 | goto read_rbu_data_exit; | |
525 | } | |
526 | ||
527 | if (pos > rbu_data.bios_image_size) { | |
528 | ret_count = 0; | |
529 | goto read_rbu_data_exit; | |
530 | } | |
531 | ||
532 | bytes_left = rbu_data.bios_image_size - pos; | |
533 | data_length = min(bytes_left, count); | |
534 | ||
535 | ptemp = rbu_data.image_update_buffer; | |
536 | memcpy(buffer, (ptemp + pos), data_length); | |
537 | ||
538 | if ((pos + count) > rbu_data.bios_image_size) | |
539 | /* this was the last copy */ | |
540 | ret_count = bytes_left; | |
541 | else | |
542 | ret_count = count; | |
543 | read_rbu_data_exit: | |
544 | return ret_count; | |
545 | } | |
546 | ||
dda8577f | 547 | static ssize_t read_rbu_data(struct kobject *kobj, char *buffer, |
ad6ce87e | 548 | loff_t pos, size_t count) |
6c54c28e AS |
549 | { |
550 | ssize_t ret_count = 0; | |
551 | ||
552 | spin_lock(&rbu_data.lock); | |
553 | ||
554 | if (!strcmp(image_type, "mono")) | |
555 | ret_count = read_rbu_mono_data(buffer, pos, count); | |
556 | else if (!strcmp(image_type, "packet")) | |
557 | ret_count = read_packet_data(buffer, pos, count); | |
558 | else | |
559 | pr_debug("read_rbu_data: invalid image type specified\n"); | |
560 | ||
561 | spin_unlock(&rbu_data.lock); | |
562 | return ret_count; | |
563 | } | |
564 | ||
dda8577f | 565 | static void callbackfn_rbu(const struct firmware *fw, void *context) |
e61c0e33 AS |
566 | { |
567 | int rc = 0; | |
568 | ||
569 | if (!fw || !fw->size) { | |
570 | rbu_data.entry_created = 0; | |
571 | return; | |
572 | } | |
573 | ||
574 | spin_lock(&rbu_data.lock); | |
575 | if (!strcmp(image_type, "mono")) { | |
576 | if (!img_update_realloc(fw->size)) | |
577 | memcpy(rbu_data.image_update_buffer, | |
578 | fw->data, fw->size); | |
579 | } else if (!strcmp(image_type, "packet")) { | |
ad6ce87e AS |
580 | /* |
581 | * we need to free previous packets if a | |
582 | * new hunk of packets needs to be downloaded | |
583 | */ | |
584 | packet_empty_list(); | |
585 | if (packetize_data(fw->data, fw->size)) | |
586 | /* Incase something goes wrong when we are | |
587 | * in middle of packetizing the data, we | |
588 | * need to free up whatever packets might | |
589 | * have been created before we quit. | |
590 | */ | |
e61c0e33 | 591 | packet_empty_list(); |
e61c0e33 AS |
592 | } else |
593 | pr_debug("invalid image type specified.\n"); | |
594 | spin_unlock(&rbu_data.lock); | |
595 | ||
596 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, | |
597 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); | |
598 | if (rc) | |
599 | printk(KERN_ERR | |
600 | "dell_rbu:%s request_firmware_nowait failed" | |
601 | " %d\n", __FUNCTION__, rc); | |
602 | else | |
603 | rbu_data.entry_created = 1; | |
604 | } | |
605 | ||
dda8577f | 606 | static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer, |
ad6ce87e | 607 | loff_t pos, size_t count) |
6c54c28e AS |
608 | { |
609 | int size = 0; | |
610 | if (!pos) | |
611 | size = sprintf(buffer, "%s\n", image_type); | |
612 | return size; | |
613 | } | |
614 | ||
dda8577f | 615 | static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer, |
ad6ce87e | 616 | loff_t pos, size_t count) |
6c54c28e AS |
617 | { |
618 | int rc = count; | |
e61c0e33 AS |
619 | int req_firm_rc = 0; |
620 | int i; | |
6c54c28e | 621 | spin_lock(&rbu_data.lock); |
e61c0e33 AS |
622 | /* |
623 | * Find the first newline or space | |
624 | */ | |
625 | for (i = 0; i < count; ++i) | |
626 | if (buffer[i] == '\n' || buffer[i] == ' ') { | |
627 | buffer[i] = '\0'; | |
628 | break; | |
629 | } | |
630 | if (i == count) | |
631 | buffer[count] = '\0'; | |
632 | ||
633 | if (strstr(buffer, "mono")) | |
634 | strcpy(image_type, "mono"); | |
635 | else if (strstr(buffer, "packet")) | |
636 | strcpy(image_type, "packet"); | |
637 | else if (strstr(buffer, "init")) { | |
638 | /* | |
639 | * If due to the user error the driver gets in a bad | |
640 | * state where even though it is loaded , the | |
641 | * /sys/class/firmware/dell_rbu entries are missing. | |
642 | * to cover this situation the user can recreate entries | |
643 | * by writing init to image_type. | |
644 | */ | |
645 | if (!rbu_data.entry_created) { | |
646 | spin_unlock(&rbu_data.lock); | |
647 | req_firm_rc = request_firmware_nowait(THIS_MODULE, | |
648 | FW_ACTION_NOHOTPLUG, "dell_rbu", | |
649 | &rbu_device->dev, &context, | |
650 | callbackfn_rbu); | |
651 | if (req_firm_rc) { | |
652 | printk(KERN_ERR | |
653 | "dell_rbu:%s request_firmware_nowait" | |
654 | " failed %d\n", __FUNCTION__, rc); | |
655 | rc = -EIO; | |
656 | } else | |
657 | rbu_data.entry_created = 1; | |
658 | ||
659 | spin_lock(&rbu_data.lock); | |
660 | } | |
661 | } else { | |
662 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); | |
663 | spin_unlock(&rbu_data.lock); | |
664 | return -EINVAL; | |
665 | } | |
6c54c28e AS |
666 | |
667 | /* we must free all previous allocations */ | |
668 | packet_empty_list(); | |
669 | img_update_free(); | |
6c54c28e | 670 | spin_unlock(&rbu_data.lock); |
6c54c28e | 671 | |
e61c0e33 | 672 | return rc; |
6c54c28e AS |
673 | } |
674 | ||
ad6ce87e AS |
675 | static ssize_t read_rbu_packet_size(struct kobject *kobj, char *buffer, |
676 | loff_t pos, size_t count) | |
677 | { | |
678 | int size = 0; | |
679 | if (!pos) { | |
680 | spin_lock(&rbu_data.lock); | |
681 | size = sprintf(buffer, "%lu\n", rbu_data.packetsize); | |
682 | spin_unlock(&rbu_data.lock); | |
683 | } | |
684 | return size; | |
685 | } | |
686 | ||
687 | static ssize_t write_rbu_packet_size(struct kobject *kobj, char *buffer, | |
688 | loff_t pos, size_t count) | |
689 | { | |
690 | unsigned long temp; | |
691 | spin_lock(&rbu_data.lock); | |
692 | packet_empty_list(); | |
693 | sscanf(buffer, "%lu", &temp); | |
694 | if (temp < 0xffffffff) | |
695 | rbu_data.packetsize = temp; | |
696 | ||
697 | spin_unlock(&rbu_data.lock); | |
698 | return count; | |
699 | } | |
700 | ||
6c54c28e | 701 | static struct bin_attribute rbu_data_attr = { |
ad6ce87e | 702 | .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444}, |
6c54c28e AS |
703 | .read = read_rbu_data, |
704 | }; | |
705 | ||
706 | static struct bin_attribute rbu_image_type_attr = { | |
ad6ce87e | 707 | .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644}, |
6c54c28e AS |
708 | .read = read_rbu_image_type, |
709 | .write = write_rbu_image_type, | |
710 | }; | |
711 | ||
ad6ce87e AS |
712 | static struct bin_attribute rbu_packet_size_attr = { |
713 | .attr = {.name = "packet_size",.owner = THIS_MODULE,.mode = 0644}, | |
714 | .read = read_rbu_packet_size, | |
715 | .write = write_rbu_packet_size, | |
716 | }; | |
717 | ||
dda8577f | 718 | static int __init dcdrbu_init(void) |
6c54c28e AS |
719 | { |
720 | int rc = 0; | |
721 | spin_lock_init(&rbu_data.lock); | |
722 | ||
723 | init_packet_head(); | |
724 | rbu_device = | |
e61c0e33 | 725 | platform_device_register_simple("dell_rbu", -1, NULL, 0); |
6c54c28e AS |
726 | if (!rbu_device) { |
727 | printk(KERN_ERR | |
e61c0e33 AS |
728 | "dell_rbu:%s:platform_device_register_simple " |
729 | "failed\n", __FUNCTION__); | |
6c54c28e AS |
730 | return -EIO; |
731 | } | |
732 | ||
733 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); | |
734 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
ad6ce87e AS |
735 | sysfs_create_bin_file(&rbu_device->dev.kobj, |
736 | &rbu_packet_size_attr); | |
6c54c28e AS |
737 | |
738 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, | |
e61c0e33 | 739 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); |
6c54c28e AS |
740 | if (rc) |
741 | printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait" | |
e61c0e33 AS |
742 | " failed %d\n", __FUNCTION__, rc); |
743 | else | |
744 | rbu_data.entry_created = 1; | |
6c54c28e AS |
745 | |
746 | return rc; | |
747 | ||
748 | } | |
749 | ||
dda8577f | 750 | static __exit void dcdrbu_exit(void) |
6c54c28e AS |
751 | { |
752 | spin_lock(&rbu_data.lock); | |
753 | packet_empty_list(); | |
754 | img_update_free(); | |
755 | spin_unlock(&rbu_data.lock); | |
756 | platform_device_unregister(rbu_device); | |
757 | } | |
758 | ||
759 | module_exit(dcdrbu_exit); | |
760 | module_init(dcdrbu_init); | |
274b6933 AS |
761 | |
762 | /* vim:noet:ts=8:sw=8 | |
763 | */ |