Commit | Line | Data |
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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/init.h> |
38 | #include <linux/module.h> | |
39 | #include <linux/string.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/blkdev.h> | |
d052d1be | 42 | #include <linux/platform_device.h> |
6c54c28e AS |
43 | #include <linux/spinlock.h> |
44 | #include <linux/moduleparam.h> | |
45 | #include <linux/firmware.h> | |
46 | #include <linux/dma-mapping.h> | |
47 | ||
48 | MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>"); | |
49 | MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); | |
50 | MODULE_LICENSE("GPL"); | |
2c560840 | 51 | MODULE_VERSION("3.2"); |
6c54c28e AS |
52 | |
53 | #define BIOS_SCAN_LIMIT 0xffffffff | |
54 | #define MAX_IMAGE_LENGTH 16 | |
55 | static struct _rbu_data { | |
56 | void *image_update_buffer; | |
57 | unsigned long image_update_buffer_size; | |
58 | unsigned long bios_image_size; | |
59 | int image_update_ordernum; | |
60 | int dma_alloc; | |
61 | spinlock_t lock; | |
62 | unsigned long packet_read_count; | |
6c54c28e AS |
63 | unsigned long num_packets; |
64 | unsigned long packetsize; | |
ad6ce87e | 65 | unsigned long imagesize; |
e61c0e33 | 66 | int entry_created; |
6c54c28e AS |
67 | } rbu_data; |
68 | ||
e61c0e33 AS |
69 | static char image_type[MAX_IMAGE_LENGTH + 1] = "mono"; |
70 | module_param_string(image_type, image_type, sizeof (image_type), 0); | |
ad6ce87e AS |
71 | MODULE_PARM_DESC(image_type, |
72 | "BIOS image type. choose- mono or packet or init"); | |
6c54c28e | 73 | |
274b6933 AS |
74 | static unsigned long allocation_floor = 0x100000; |
75 | module_param(allocation_floor, ulong, 0644); | |
76 | MODULE_PARM_DESC(allocation_floor, | |
77 | "Minimum address for allocations when using Packet mode"); | |
78 | ||
6c54c28e AS |
79 | struct packet_data { |
80 | struct list_head list; | |
81 | size_t length; | |
82 | void *data; | |
83 | int ordernum; | |
84 | }; | |
85 | ||
86 | static struct packet_data packet_data_head; | |
87 | ||
88 | static struct platform_device *rbu_device; | |
89 | static int context; | |
90 | static dma_addr_t dell_rbu_dmaaddr; | |
91 | ||
dda8577f | 92 | static void init_packet_head(void) |
6c54c28e AS |
93 | { |
94 | INIT_LIST_HEAD(&packet_data_head.list); | |
6c54c28e AS |
95 | rbu_data.packet_read_count = 0; |
96 | rbu_data.num_packets = 0; | |
97 | rbu_data.packetsize = 0; | |
ad6ce87e | 98 | rbu_data.imagesize = 0; |
6c54c28e AS |
99 | } |
100 | ||
ad6ce87e | 101 | static int create_packet(void *data, size_t length) |
6c54c28e AS |
102 | { |
103 | struct packet_data *newpacket; | |
104 | int ordernum = 0; | |
274b6933 AS |
105 | int retval = 0; |
106 | unsigned int packet_array_size = 0; | |
5ad9201b AV |
107 | void **invalid_addr_packet_array = NULL; |
108 | void *packet_data_temp_buf = NULL; | |
274b6933 | 109 | unsigned int idx = 0; |
6c54c28e AS |
110 | |
111 | pr_debug("create_packet: entry \n"); | |
112 | ||
113 | if (!rbu_data.packetsize) { | |
114 | pr_debug("create_packet: packetsize not specified\n"); | |
274b6933 AS |
115 | retval = -EINVAL; |
116 | goto out_noalloc; | |
6c54c28e | 117 | } |
274b6933 | 118 | |
e61c0e33 | 119 | spin_unlock(&rbu_data.lock); |
274b6933 AS |
120 | |
121 | newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL); | |
6c54c28e | 122 | |
6c54c28e AS |
123 | if (!newpacket) { |
124 | printk(KERN_WARNING | |
e61c0e33 | 125 | "dell_rbu:%s: failed to allocate new " |
eecd5853 | 126 | "packet\n", __func__); |
274b6933 AS |
127 | retval = -ENOMEM; |
128 | spin_lock(&rbu_data.lock); | |
129 | goto out_noalloc; | |
6c54c28e AS |
130 | } |
131 | ||
132 | ordernum = get_order(length); | |
274b6933 | 133 | |
6c54c28e | 134 | /* |
274b6933 AS |
135 | * BIOS errata mean we cannot allocate packets below 1MB or they will |
136 | * be overwritten by BIOS. | |
137 | * | |
138 | * array to temporarily hold packets | |
139 | * that are below the allocation floor | |
140 | * | |
141 | * NOTE: very simplistic because we only need the floor to be at 1MB | |
142 | * due to BIOS errata. This shouldn't be used for higher floors | |
143 | * or you will run out of mem trying to allocate the array. | |
6c54c28e | 144 | */ |
274b6933 AS |
145 | packet_array_size = max( |
146 | (unsigned int)(allocation_floor / rbu_data.packetsize), | |
147 | (unsigned int)1); | |
148 | invalid_addr_packet_array = kzalloc(packet_array_size * sizeof(void*), | |
149 | GFP_KERNEL); | |
6c54c28e | 150 | |
274b6933 | 151 | if (!invalid_addr_packet_array) { |
6c54c28e | 152 | printk(KERN_WARNING |
274b6933 AS |
153 | "dell_rbu:%s: failed to allocate " |
154 | "invalid_addr_packet_array \n", | |
eecd5853 | 155 | __func__); |
274b6933 AS |
156 | retval = -ENOMEM; |
157 | spin_lock(&rbu_data.lock); | |
158 | goto out_alloc_packet; | |
6c54c28e AS |
159 | } |
160 | ||
274b6933 AS |
161 | while (!packet_data_temp_buf) { |
162 | packet_data_temp_buf = (unsigned char *) | |
163 | __get_free_pages(GFP_KERNEL, ordernum); | |
164 | if (!packet_data_temp_buf) { | |
165 | printk(KERN_WARNING | |
166 | "dell_rbu:%s: failed to allocate new " | |
eecd5853 | 167 | "packet\n", __func__); |
274b6933 AS |
168 | retval = -ENOMEM; |
169 | spin_lock(&rbu_data.lock); | |
170 | goto out_alloc_packet_array; | |
171 | } | |
172 | ||
173 | if ((unsigned long)virt_to_phys(packet_data_temp_buf) | |
174 | < allocation_floor) { | |
175 | pr_debug("packet 0x%lx below floor at 0x%lx.\n", | |
176 | (unsigned long)virt_to_phys( | |
177 | packet_data_temp_buf), | |
178 | allocation_floor); | |
179 | invalid_addr_packet_array[idx++] = packet_data_temp_buf; | |
5ad9201b | 180 | packet_data_temp_buf = NULL; |
274b6933 AS |
181 | } |
182 | } | |
183 | spin_lock(&rbu_data.lock); | |
184 | ||
185 | newpacket->data = packet_data_temp_buf; | |
186 | ||
187 | pr_debug("create_packet: newpacket at physical addr %lx\n", | |
188 | (unsigned long)virt_to_phys(newpacket->data)); | |
189 | ||
190 | /* packets may not have fixed size */ | |
191 | newpacket->length = length; | |
6c54c28e AS |
192 | newpacket->ordernum = ordernum; |
193 | ++rbu_data.num_packets; | |
274b6933 AS |
194 | |
195 | /* initialize the newly created packet headers */ | |
6c54c28e AS |
196 | INIT_LIST_HEAD(&newpacket->list); |
197 | list_add_tail(&newpacket->list, &packet_data_head.list); | |
ad6ce87e AS |
198 | |
199 | memcpy(newpacket->data, data, length); | |
6c54c28e AS |
200 | |
201 | pr_debug("create_packet: exit \n"); | |
202 | ||
274b6933 AS |
203 | out_alloc_packet_array: |
204 | /* always free packet array */ | |
205 | for (;idx>0;idx--) { | |
206 | pr_debug("freeing unused packet below floor 0x%lx.\n", | |
207 | (unsigned long)virt_to_phys( | |
208 | invalid_addr_packet_array[idx-1])); | |
209 | free_pages((unsigned long)invalid_addr_packet_array[idx-1], | |
210 | ordernum); | |
211 | } | |
212 | kfree(invalid_addr_packet_array); | |
213 | ||
214 | out_alloc_packet: | |
215 | /* if error, free data */ | |
216 | if (retval) | |
217 | kfree(newpacket); | |
218 | ||
219 | out_noalloc: | |
220 | return retval; | |
6c54c28e AS |
221 | } |
222 | ||
c6c1c94e | 223 | static int packetize_data(const u8 *data, size_t length) |
6c54c28e AS |
224 | { |
225 | int rc = 0; | |
ad6ce87e AS |
226 | int done = 0; |
227 | int packet_length; | |
228 | u8 *temp; | |
229 | u8 *end = (u8 *) data + length; | |
cb7cf57a | 230 | pr_debug("packetize_data: data length %zd\n", length); |
ad6ce87e AS |
231 | if (!rbu_data.packetsize) { |
232 | printk(KERN_WARNING | |
233 | "dell_rbu: packetsize not specified\n"); | |
234 | return -EIO; | |
235 | } | |
6c54c28e | 236 | |
ad6ce87e AS |
237 | temp = (u8 *) data; |
238 | ||
239 | /* packetize the hunk */ | |
240 | while (!done) { | |
241 | if ((temp + rbu_data.packetsize) < end) | |
242 | packet_length = rbu_data.packetsize; | |
243 | else { | |
244 | /* this is the last packet */ | |
245 | packet_length = end - temp; | |
246 | done = 1; | |
247 | } | |
248 | ||
249 | if ((rc = create_packet(temp, packet_length))) | |
6c54c28e | 250 | return rc; |
ad6ce87e | 251 | |
9e42ef77 | 252 | pr_debug("%p:%td\n", temp, (end - temp)); |
ad6ce87e | 253 | temp += packet_length; |
6c54c28e | 254 | } |
ad6ce87e AS |
255 | |
256 | rbu_data.imagesize = length; | |
6c54c28e AS |
257 | |
258 | return rc; | |
259 | } | |
260 | ||
dda8577f | 261 | static int do_packet_read(char *data, struct list_head *ptemp_list, |
e61c0e33 | 262 | int length, int bytes_read, int *list_read_count) |
6c54c28e AS |
263 | { |
264 | void *ptemp_buf; | |
265 | struct packet_data *newpacket = NULL; | |
266 | int bytes_copied = 0; | |
267 | int j = 0; | |
268 | ||
269 | newpacket = list_entry(ptemp_list, struct packet_data, list); | |
270 | *list_read_count += newpacket->length; | |
271 | ||
272 | if (*list_read_count > bytes_read) { | |
273 | /* point to the start of unread data */ | |
274 | j = newpacket->length - (*list_read_count - bytes_read); | |
275 | /* point to the offset in the packet buffer */ | |
276 | ptemp_buf = (u8 *) newpacket->data + j; | |
277 | /* | |
278 | * check if there is enough room in | |
279 | * * the incoming buffer | |
280 | */ | |
281 | if (length > (*list_read_count - bytes_read)) | |
282 | /* | |
283 | * copy what ever is there in this | |
284 | * packet and move on | |
285 | */ | |
286 | bytes_copied = (*list_read_count - bytes_read); | |
287 | else | |
288 | /* copy the remaining */ | |
289 | bytes_copied = length; | |
290 | memcpy(data, ptemp_buf, bytes_copied); | |
291 | } | |
292 | return bytes_copied; | |
293 | } | |
294 | ||
ad6ce87e | 295 | static int packet_read_list(char *data, size_t * pread_length) |
6c54c28e AS |
296 | { |
297 | struct list_head *ptemp_list; | |
298 | int temp_count = 0; | |
299 | int bytes_copied = 0; | |
300 | int bytes_read = 0; | |
301 | int remaining_bytes = 0; | |
302 | char *pdest = data; | |
303 | ||
304 | /* check if we have any packets */ | |
305 | if (0 == rbu_data.num_packets) | |
306 | return -ENOMEM; | |
307 | ||
308 | remaining_bytes = *pread_length; | |
309 | bytes_read = rbu_data.packet_read_count; | |
310 | ||
311 | ptemp_list = (&packet_data_head.list)->next; | |
312 | while (!list_empty(ptemp_list)) { | |
313 | bytes_copied = do_packet_read(pdest, ptemp_list, | |
e61c0e33 | 314 | remaining_bytes, bytes_read, &temp_count); |
6c54c28e AS |
315 | remaining_bytes -= bytes_copied; |
316 | bytes_read += bytes_copied; | |
317 | pdest += bytes_copied; | |
318 | /* | |
319 | * check if we reached end of buffer before reaching the | |
320 | * last packet | |
321 | */ | |
322 | if (remaining_bytes == 0) | |
323 | break; | |
324 | ||
325 | ptemp_list = ptemp_list->next; | |
326 | } | |
327 | /*finally set the bytes read */ | |
328 | *pread_length = bytes_read - rbu_data.packet_read_count; | |
329 | rbu_data.packet_read_count = bytes_read; | |
330 | return 0; | |
331 | } | |
332 | ||
dda8577f | 333 | static void packet_empty_list(void) |
6c54c28e AS |
334 | { |
335 | struct list_head *ptemp_list; | |
336 | struct list_head *pnext_list; | |
337 | struct packet_data *newpacket; | |
338 | ||
339 | ptemp_list = (&packet_data_head.list)->next; | |
340 | while (!list_empty(ptemp_list)) { | |
341 | newpacket = | |
e61c0e33 | 342 | list_entry(ptemp_list, struct packet_data, list); |
6c54c28e AS |
343 | pnext_list = ptemp_list->next; |
344 | list_del(ptemp_list); | |
345 | ptemp_list = pnext_list; | |
346 | /* | |
347 | * zero out the RBU packet memory before freeing | |
348 | * to make sure there are no stale RBU packets left in memory | |
349 | */ | |
350 | memset(newpacket->data, 0, rbu_data.packetsize); | |
e61c0e33 AS |
351 | free_pages((unsigned long) newpacket->data, |
352 | newpacket->ordernum); | |
6c54c28e AS |
353 | kfree(newpacket); |
354 | } | |
6c54c28e AS |
355 | rbu_data.packet_read_count = 0; |
356 | rbu_data.num_packets = 0; | |
ad6ce87e | 357 | rbu_data.imagesize = 0; |
6c54c28e AS |
358 | } |
359 | ||
360 | /* | |
361 | * img_update_free: Frees the buffer allocated for storing BIOS image | |
362 | * Always called with lock held and returned with lock held | |
363 | */ | |
dda8577f | 364 | static void img_update_free(void) |
6c54c28e AS |
365 | { |
366 | if (!rbu_data.image_update_buffer) | |
367 | return; | |
368 | /* | |
369 | * zero out this buffer before freeing it to get rid of any stale | |
370 | * BIOS image copied in memory. | |
371 | */ | |
372 | memset(rbu_data.image_update_buffer, 0, | |
e61c0e33 | 373 | rbu_data.image_update_buffer_size); |
6c54c28e AS |
374 | if (rbu_data.dma_alloc == 1) |
375 | dma_free_coherent(NULL, rbu_data.bios_image_size, | |
e61c0e33 | 376 | rbu_data.image_update_buffer, dell_rbu_dmaaddr); |
6c54c28e | 377 | else |
e61c0e33 AS |
378 | free_pages((unsigned long) rbu_data.image_update_buffer, |
379 | rbu_data.image_update_ordernum); | |
6c54c28e AS |
380 | |
381 | /* | |
382 | * Re-initialize the rbu_data variables after a free | |
383 | */ | |
384 | rbu_data.image_update_ordernum = -1; | |
385 | rbu_data.image_update_buffer = NULL; | |
386 | rbu_data.image_update_buffer_size = 0; | |
387 | rbu_data.bios_image_size = 0; | |
388 | rbu_data.dma_alloc = 0; | |
389 | } | |
390 | ||
391 | /* | |
392 | * img_update_realloc: This function allocates the contiguous pages to | |
393 | * accommodate the requested size of data. The memory address and size | |
394 | * values are stored globally and on every call to this function the new | |
395 | * size is checked to see if more data is required than the existing size. | |
396 | * If true the previous memory is freed and new allocation is done to | |
397 | * accommodate the new size. If the incoming size is less then than the | |
398 | * already allocated size, then that memory is reused. This function is | |
399 | * called with lock held and returns with lock held. | |
400 | */ | |
dda8577f | 401 | static int img_update_realloc(unsigned long size) |
6c54c28e AS |
402 | { |
403 | unsigned char *image_update_buffer = NULL; | |
404 | unsigned long rc; | |
405 | unsigned long img_buf_phys_addr; | |
406 | int ordernum; | |
407 | int dma_alloc = 0; | |
408 | ||
409 | /* | |
410 | * check if the buffer of sufficient size has been | |
411 | * already allocated | |
412 | */ | |
413 | if (rbu_data.image_update_buffer_size >= size) { | |
414 | /* | |
415 | * check for corruption | |
416 | */ | |
417 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { | |
418 | printk(KERN_ERR "dell_rbu:%s: corruption " | |
eecd5853 | 419 | "check failed\n", __func__); |
6c54c28e AS |
420 | return -EINVAL; |
421 | } | |
422 | /* | |
423 | * we have a valid pre-allocated buffer with | |
424 | * sufficient size | |
425 | */ | |
426 | return 0; | |
427 | } | |
428 | ||
429 | /* | |
430 | * free any previously allocated buffer | |
431 | */ | |
432 | img_update_free(); | |
433 | ||
434 | spin_unlock(&rbu_data.lock); | |
435 | ||
436 | ordernum = get_order(size); | |
437 | image_update_buffer = | |
e61c0e33 | 438 | (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum); |
6c54c28e AS |
439 | |
440 | img_buf_phys_addr = | |
e61c0e33 | 441 | (unsigned long) virt_to_phys(image_update_buffer); |
6c54c28e AS |
442 | |
443 | if (img_buf_phys_addr > BIOS_SCAN_LIMIT) { | |
e61c0e33 | 444 | free_pages((unsigned long) image_update_buffer, ordernum); |
6c54c28e AS |
445 | ordernum = -1; |
446 | image_update_buffer = dma_alloc_coherent(NULL, size, | |
e61c0e33 | 447 | &dell_rbu_dmaaddr, GFP_KERNEL); |
6c54c28e AS |
448 | dma_alloc = 1; |
449 | } | |
450 | ||
451 | spin_lock(&rbu_data.lock); | |
452 | ||
453 | if (image_update_buffer != NULL) { | |
454 | rbu_data.image_update_buffer = image_update_buffer; | |
455 | rbu_data.image_update_buffer_size = size; | |
456 | rbu_data.bios_image_size = | |
e61c0e33 | 457 | rbu_data.image_update_buffer_size; |
6c54c28e AS |
458 | rbu_data.image_update_ordernum = ordernum; |
459 | rbu_data.dma_alloc = dma_alloc; | |
460 | rc = 0; | |
461 | } else { | |
462 | pr_debug("Not enough memory for image update:" | |
e61c0e33 | 463 | "size = %ld\n", size); |
6c54c28e AS |
464 | rc = -ENOMEM; |
465 | } | |
466 | ||
467 | return rc; | |
468 | } | |
469 | ||
dda8577f | 470 | static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
471 | { |
472 | int retval; | |
473 | size_t bytes_left; | |
474 | size_t data_length; | |
475 | char *ptempBuf = buffer; | |
6c54c28e AS |
476 | |
477 | /* check to see if we have something to return */ | |
478 | if (rbu_data.num_packets == 0) { | |
479 | pr_debug("read_packet_data: no packets written\n"); | |
480 | retval = -ENOMEM; | |
481 | goto read_rbu_data_exit; | |
482 | } | |
483 | ||
ad6ce87e | 484 | if (pos > rbu_data.imagesize) { |
6c54c28e AS |
485 | retval = 0; |
486 | printk(KERN_WARNING "dell_rbu:read_packet_data: " | |
e61c0e33 | 487 | "data underrun\n"); |
6c54c28e AS |
488 | goto read_rbu_data_exit; |
489 | } | |
490 | ||
ad6ce87e | 491 | bytes_left = rbu_data.imagesize - pos; |
6c54c28e AS |
492 | data_length = min(bytes_left, count); |
493 | ||
494 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) | |
495 | goto read_rbu_data_exit; | |
496 | ||
ad6ce87e | 497 | if ((pos + count) > rbu_data.imagesize) { |
6c54c28e AS |
498 | rbu_data.packet_read_count = 0; |
499 | /* this was the last copy */ | |
500 | retval = bytes_left; | |
501 | } else | |
502 | retval = count; | |
503 | ||
504 | read_rbu_data_exit: | |
505 | return retval; | |
506 | } | |
507 | ||
dda8577f | 508 | static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
509 | { |
510 | unsigned char *ptemp = NULL; | |
511 | size_t bytes_left = 0; | |
512 | size_t data_length = 0; | |
513 | ssize_t ret_count = 0; | |
514 | ||
515 | /* check to see if we have something to return */ | |
516 | if ((rbu_data.image_update_buffer == NULL) || | |
e61c0e33 | 517 | (rbu_data.bios_image_size == 0)) { |
6c54c28e | 518 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
e61c0e33 AS |
519 | "bios_image_size %lu\n", |
520 | rbu_data.image_update_buffer, | |
521 | rbu_data.bios_image_size); | |
6c54c28e AS |
522 | ret_count = -ENOMEM; |
523 | goto read_rbu_data_exit; | |
524 | } | |
525 | ||
526 | if (pos > rbu_data.bios_image_size) { | |
527 | ret_count = 0; | |
528 | goto read_rbu_data_exit; | |
529 | } | |
530 | ||
531 | bytes_left = rbu_data.bios_image_size - pos; | |
532 | data_length = min(bytes_left, count); | |
533 | ||
534 | ptemp = rbu_data.image_update_buffer; | |
535 | memcpy(buffer, (ptemp + pos), data_length); | |
536 | ||
537 | if ((pos + count) > rbu_data.bios_image_size) | |
538 | /* this was the last copy */ | |
539 | ret_count = bytes_left; | |
540 | else | |
541 | ret_count = count; | |
542 | read_rbu_data_exit: | |
543 | return ret_count; | |
544 | } | |
545 | ||
91a69029 ZR |
546 | static ssize_t read_rbu_data(struct kobject *kobj, |
547 | struct bin_attribute *bin_attr, | |
548 | char *buffer, 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 | 566 | { |
2c560840 | 567 | rbu_data.entry_created = 0; |
e61c0e33 | 568 | |
2c560840 | 569 | if (!fw || !fw->size) |
e61c0e33 | 570 | return; |
e61c0e33 AS |
571 | |
572 | spin_lock(&rbu_data.lock); | |
573 | if (!strcmp(image_type, "mono")) { | |
574 | if (!img_update_realloc(fw->size)) | |
575 | memcpy(rbu_data.image_update_buffer, | |
576 | fw->data, fw->size); | |
577 | } else if (!strcmp(image_type, "packet")) { | |
ad6ce87e AS |
578 | /* |
579 | * we need to free previous packets if a | |
580 | * new hunk of packets needs to be downloaded | |
581 | */ | |
582 | packet_empty_list(); | |
583 | if (packetize_data(fw->data, fw->size)) | |
584 | /* Incase something goes wrong when we are | |
585 | * in middle of packetizing the data, we | |
586 | * need to free up whatever packets might | |
587 | * have been created before we quit. | |
588 | */ | |
e61c0e33 | 589 | packet_empty_list(); |
e61c0e33 AS |
590 | } else |
591 | pr_debug("invalid image type specified.\n"); | |
592 | spin_unlock(&rbu_data.lock); | |
e61c0e33 AS |
593 | } |
594 | ||
91a69029 ZR |
595 | static ssize_t read_rbu_image_type(struct kobject *kobj, |
596 | struct bin_attribute *bin_attr, | |
597 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
598 | { |
599 | int size = 0; | |
600 | if (!pos) | |
601 | size = sprintf(buffer, "%s\n", image_type); | |
602 | return size; | |
603 | } | |
604 | ||
91a69029 ZR |
605 | static ssize_t write_rbu_image_type(struct kobject *kobj, |
606 | struct bin_attribute *bin_attr, | |
607 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
608 | { |
609 | int rc = count; | |
e61c0e33 AS |
610 | int req_firm_rc = 0; |
611 | int i; | |
6c54c28e | 612 | spin_lock(&rbu_data.lock); |
e61c0e33 AS |
613 | /* |
614 | * Find the first newline or space | |
615 | */ | |
616 | for (i = 0; i < count; ++i) | |
617 | if (buffer[i] == '\n' || buffer[i] == ' ') { | |
618 | buffer[i] = '\0'; | |
619 | break; | |
620 | } | |
621 | if (i == count) | |
622 | buffer[count] = '\0'; | |
623 | ||
624 | if (strstr(buffer, "mono")) | |
625 | strcpy(image_type, "mono"); | |
626 | else if (strstr(buffer, "packet")) | |
627 | strcpy(image_type, "packet"); | |
628 | else if (strstr(buffer, "init")) { | |
629 | /* | |
630 | * If due to the user error the driver gets in a bad | |
631 | * state where even though it is loaded , the | |
632 | * /sys/class/firmware/dell_rbu entries are missing. | |
633 | * to cover this situation the user can recreate entries | |
634 | * by writing init to image_type. | |
635 | */ | |
636 | if (!rbu_data.entry_created) { | |
637 | spin_unlock(&rbu_data.lock); | |
638 | req_firm_rc = request_firmware_nowait(THIS_MODULE, | |
639 | FW_ACTION_NOHOTPLUG, "dell_rbu", | |
640 | &rbu_device->dev, &context, | |
641 | callbackfn_rbu); | |
642 | if (req_firm_rc) { | |
643 | printk(KERN_ERR | |
644 | "dell_rbu:%s request_firmware_nowait" | |
eecd5853 | 645 | " failed %d\n", __func__, rc); |
e61c0e33 AS |
646 | rc = -EIO; |
647 | } else | |
648 | rbu_data.entry_created = 1; | |
649 | ||
650 | spin_lock(&rbu_data.lock); | |
651 | } | |
652 | } else { | |
653 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); | |
654 | spin_unlock(&rbu_data.lock); | |
655 | return -EINVAL; | |
656 | } | |
6c54c28e AS |
657 | |
658 | /* we must free all previous allocations */ | |
659 | packet_empty_list(); | |
660 | img_update_free(); | |
6c54c28e | 661 | spin_unlock(&rbu_data.lock); |
6c54c28e | 662 | |
e61c0e33 | 663 | return rc; |
6c54c28e AS |
664 | } |
665 | ||
91a69029 ZR |
666 | static ssize_t read_rbu_packet_size(struct kobject *kobj, |
667 | struct bin_attribute *bin_attr, | |
668 | char *buffer, loff_t pos, size_t count) | |
ad6ce87e AS |
669 | { |
670 | int size = 0; | |
671 | if (!pos) { | |
672 | spin_lock(&rbu_data.lock); | |
673 | size = sprintf(buffer, "%lu\n", rbu_data.packetsize); | |
674 | spin_unlock(&rbu_data.lock); | |
675 | } | |
676 | return size; | |
677 | } | |
678 | ||
91a69029 ZR |
679 | static ssize_t write_rbu_packet_size(struct kobject *kobj, |
680 | struct bin_attribute *bin_attr, | |
681 | char *buffer, loff_t pos, size_t count) | |
ad6ce87e AS |
682 | { |
683 | unsigned long temp; | |
684 | spin_lock(&rbu_data.lock); | |
685 | packet_empty_list(); | |
686 | sscanf(buffer, "%lu", &temp); | |
687 | if (temp < 0xffffffff) | |
688 | rbu_data.packetsize = temp; | |
689 | ||
690 | spin_unlock(&rbu_data.lock); | |
691 | return count; | |
692 | } | |
693 | ||
6c54c28e | 694 | static struct bin_attribute rbu_data_attr = { |
7b595756 | 695 | .attr = {.name = "data", .mode = 0444}, |
6c54c28e AS |
696 | .read = read_rbu_data, |
697 | }; | |
698 | ||
699 | static struct bin_attribute rbu_image_type_attr = { | |
7b595756 | 700 | .attr = {.name = "image_type", .mode = 0644}, |
6c54c28e AS |
701 | .read = read_rbu_image_type, |
702 | .write = write_rbu_image_type, | |
703 | }; | |
704 | ||
ad6ce87e | 705 | static struct bin_attribute rbu_packet_size_attr = { |
7b595756 | 706 | .attr = {.name = "packet_size", .mode = 0644}, |
ad6ce87e AS |
707 | .read = read_rbu_packet_size, |
708 | .write = write_rbu_packet_size, | |
709 | }; | |
710 | ||
dda8577f | 711 | static int __init dcdrbu_init(void) |
6c54c28e | 712 | { |
6897083a | 713 | int rc; |
6c54c28e AS |
714 | spin_lock_init(&rbu_data.lock); |
715 | ||
716 | init_packet_head(); | |
6897083a AM |
717 | rbu_device = platform_device_register_simple("dell_rbu", -1, NULL, 0); |
718 | if (IS_ERR(rbu_device)) { | |
6c54c28e | 719 | printk(KERN_ERR |
e61c0e33 | 720 | "dell_rbu:%s:platform_device_register_simple " |
eecd5853 | 721 | "failed\n", __func__); |
6897083a | 722 | return PTR_ERR(rbu_device); |
6c54c28e AS |
723 | } |
724 | ||
41bfcfd9 JG |
725 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); |
726 | if (rc) | |
727 | goto out_devreg; | |
728 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
729 | if (rc) | |
730 | goto out_data; | |
731 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, | |
ad6ce87e | 732 | &rbu_packet_size_attr); |
41bfcfd9 JG |
733 | if (rc) |
734 | goto out_imtype; | |
6c54c28e | 735 | |
2c560840 | 736 | rbu_data.entry_created = 0; |
41bfcfd9 | 737 | return 0; |
6c54c28e | 738 | |
41bfcfd9 JG |
739 | out_imtype: |
740 | sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
741 | out_data: | |
742 | sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); | |
743 | out_devreg: | |
744 | platform_device_unregister(rbu_device); | |
745 | return rc; | |
6c54c28e AS |
746 | } |
747 | ||
dda8577f | 748 | static __exit void dcdrbu_exit(void) |
6c54c28e AS |
749 | { |
750 | spin_lock(&rbu_data.lock); | |
751 | packet_empty_list(); | |
752 | img_update_free(); | |
753 | spin_unlock(&rbu_data.lock); | |
754 | platform_device_unregister(rbu_device); | |
755 | } | |
756 | ||
757 | module_exit(dcdrbu_exit); | |
758 | module_init(dcdrbu_init); | |
274b6933 AS |
759 | |
760 | /* vim:noet:ts=8:sw=8 | |
761 | */ |