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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> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
6c54c28e AS |
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> | |
d87e8465 | 48 | #include <asm/set_memory.h> |
6c54c28e AS |
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"); | |
2c560840 | 53 | MODULE_VERSION("3.2"); |
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; | |
6c54c28e AS |
65 | unsigned long num_packets; |
66 | unsigned long packetsize; | |
ad6ce87e | 67 | unsigned long imagesize; |
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); | |
ad6ce87e AS |
73 | MODULE_PARM_DESC(image_type, |
74 | "BIOS image type. choose- mono or packet or init"); | |
6c54c28e | 75 | |
274b6933 AS |
76 | static unsigned long allocation_floor = 0x100000; |
77 | module_param(allocation_floor, ulong, 0644); | |
78 | MODULE_PARM_DESC(allocation_floor, | |
79 | "Minimum address for allocations when using Packet mode"); | |
80 | ||
6c54c28e AS |
81 | struct packet_data { |
82 | struct list_head list; | |
83 | size_t length; | |
84 | void *data; | |
85 | int ordernum; | |
86 | }; | |
87 | ||
88 | static struct packet_data packet_data_head; | |
89 | ||
90 | static struct platform_device *rbu_device; | |
91 | static int context; | |
92 | static dma_addr_t dell_rbu_dmaaddr; | |
93 | ||
dda8577f | 94 | static void init_packet_head(void) |
6c54c28e AS |
95 | { |
96 | INIT_LIST_HEAD(&packet_data_head.list); | |
6c54c28e AS |
97 | rbu_data.packet_read_count = 0; |
98 | rbu_data.num_packets = 0; | |
99 | rbu_data.packetsize = 0; | |
ad6ce87e | 100 | rbu_data.imagesize = 0; |
6c54c28e AS |
101 | } |
102 | ||
ad6ce87e | 103 | static int create_packet(void *data, size_t length) |
6c54c28e AS |
104 | { |
105 | struct packet_data *newpacket; | |
106 | int ordernum = 0; | |
274b6933 AS |
107 | int retval = 0; |
108 | unsigned int packet_array_size = 0; | |
5ad9201b AV |
109 | void **invalid_addr_packet_array = NULL; |
110 | void *packet_data_temp_buf = NULL; | |
274b6933 | 111 | unsigned int idx = 0; |
6c54c28e AS |
112 | |
113 | pr_debug("create_packet: entry \n"); | |
114 | ||
115 | if (!rbu_data.packetsize) { | |
116 | pr_debug("create_packet: packetsize not specified\n"); | |
274b6933 AS |
117 | retval = -EINVAL; |
118 | goto out_noalloc; | |
6c54c28e | 119 | } |
274b6933 | 120 | |
e61c0e33 | 121 | spin_unlock(&rbu_data.lock); |
274b6933 AS |
122 | |
123 | newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL); | |
6c54c28e | 124 | |
6c54c28e AS |
125 | if (!newpacket) { |
126 | printk(KERN_WARNING | |
e61c0e33 | 127 | "dell_rbu:%s: failed to allocate new " |
eecd5853 | 128 | "packet\n", __func__); |
274b6933 AS |
129 | retval = -ENOMEM; |
130 | spin_lock(&rbu_data.lock); | |
131 | goto out_noalloc; | |
6c54c28e AS |
132 | } |
133 | ||
134 | ordernum = get_order(length); | |
274b6933 | 135 | |
6c54c28e | 136 | /* |
274b6933 AS |
137 | * BIOS errata mean we cannot allocate packets below 1MB or they will |
138 | * be overwritten by BIOS. | |
139 | * | |
140 | * array to temporarily hold packets | |
141 | * that are below the allocation floor | |
142 | * | |
143 | * NOTE: very simplistic because we only need the floor to be at 1MB | |
144 | * due to BIOS errata. This shouldn't be used for higher floors | |
145 | * or you will run out of mem trying to allocate the array. | |
6c54c28e | 146 | */ |
274b6933 AS |
147 | packet_array_size = max( |
148 | (unsigned int)(allocation_floor / rbu_data.packetsize), | |
149 | (unsigned int)1); | |
150 | invalid_addr_packet_array = kzalloc(packet_array_size * sizeof(void*), | |
151 | GFP_KERNEL); | |
6c54c28e | 152 | |
274b6933 | 153 | if (!invalid_addr_packet_array) { |
6c54c28e | 154 | printk(KERN_WARNING |
274b6933 AS |
155 | "dell_rbu:%s: failed to allocate " |
156 | "invalid_addr_packet_array \n", | |
eecd5853 | 157 | __func__); |
274b6933 AS |
158 | retval = -ENOMEM; |
159 | spin_lock(&rbu_data.lock); | |
160 | goto out_alloc_packet; | |
6c54c28e AS |
161 | } |
162 | ||
274b6933 AS |
163 | while (!packet_data_temp_buf) { |
164 | packet_data_temp_buf = (unsigned char *) | |
165 | __get_free_pages(GFP_KERNEL, ordernum); | |
166 | if (!packet_data_temp_buf) { | |
167 | printk(KERN_WARNING | |
168 | "dell_rbu:%s: failed to allocate new " | |
eecd5853 | 169 | "packet\n", __func__); |
274b6933 AS |
170 | retval = -ENOMEM; |
171 | spin_lock(&rbu_data.lock); | |
172 | goto out_alloc_packet_array; | |
173 | } | |
174 | ||
175 | if ((unsigned long)virt_to_phys(packet_data_temp_buf) | |
176 | < allocation_floor) { | |
177 | pr_debug("packet 0x%lx below floor at 0x%lx.\n", | |
178 | (unsigned long)virt_to_phys( | |
179 | packet_data_temp_buf), | |
180 | allocation_floor); | |
181 | invalid_addr_packet_array[idx++] = packet_data_temp_buf; | |
5ad9201b | 182 | packet_data_temp_buf = NULL; |
274b6933 AS |
183 | } |
184 | } | |
d87e8465 SH |
185 | /* |
186 | * set to uncachable or it may never get written back before reboot | |
187 | */ | |
188 | set_memory_uc((unsigned long)packet_data_temp_buf, 1 << ordernum); | |
189 | ||
274b6933 AS |
190 | spin_lock(&rbu_data.lock); |
191 | ||
192 | newpacket->data = packet_data_temp_buf; | |
193 | ||
194 | pr_debug("create_packet: newpacket at physical addr %lx\n", | |
195 | (unsigned long)virt_to_phys(newpacket->data)); | |
196 | ||
197 | /* packets may not have fixed size */ | |
198 | newpacket->length = length; | |
6c54c28e AS |
199 | newpacket->ordernum = ordernum; |
200 | ++rbu_data.num_packets; | |
274b6933 AS |
201 | |
202 | /* initialize the newly created packet headers */ | |
6c54c28e AS |
203 | INIT_LIST_HEAD(&newpacket->list); |
204 | list_add_tail(&newpacket->list, &packet_data_head.list); | |
ad6ce87e AS |
205 | |
206 | memcpy(newpacket->data, data, length); | |
6c54c28e AS |
207 | |
208 | pr_debug("create_packet: exit \n"); | |
209 | ||
274b6933 AS |
210 | out_alloc_packet_array: |
211 | /* always free packet array */ | |
212 | for (;idx>0;idx--) { | |
213 | pr_debug("freeing unused packet below floor 0x%lx.\n", | |
214 | (unsigned long)virt_to_phys( | |
215 | invalid_addr_packet_array[idx-1])); | |
216 | free_pages((unsigned long)invalid_addr_packet_array[idx-1], | |
217 | ordernum); | |
218 | } | |
219 | kfree(invalid_addr_packet_array); | |
220 | ||
221 | out_alloc_packet: | |
222 | /* if error, free data */ | |
223 | if (retval) | |
224 | kfree(newpacket); | |
225 | ||
226 | out_noalloc: | |
227 | return retval; | |
6c54c28e AS |
228 | } |
229 | ||
c6c1c94e | 230 | static int packetize_data(const u8 *data, size_t length) |
6c54c28e AS |
231 | { |
232 | int rc = 0; | |
ad6ce87e AS |
233 | int done = 0; |
234 | int packet_length; | |
235 | u8 *temp; | |
236 | u8 *end = (u8 *) data + length; | |
cb7cf57a | 237 | pr_debug("packetize_data: data length %zd\n", length); |
ad6ce87e AS |
238 | if (!rbu_data.packetsize) { |
239 | printk(KERN_WARNING | |
240 | "dell_rbu: packetsize not specified\n"); | |
241 | return -EIO; | |
242 | } | |
6c54c28e | 243 | |
ad6ce87e AS |
244 | temp = (u8 *) data; |
245 | ||
246 | /* packetize the hunk */ | |
247 | while (!done) { | |
248 | if ((temp + rbu_data.packetsize) < end) | |
249 | packet_length = rbu_data.packetsize; | |
250 | else { | |
251 | /* this is the last packet */ | |
252 | packet_length = end - temp; | |
253 | done = 1; | |
254 | } | |
255 | ||
256 | if ((rc = create_packet(temp, packet_length))) | |
6c54c28e | 257 | return rc; |
ad6ce87e | 258 | |
9e42ef77 | 259 | pr_debug("%p:%td\n", temp, (end - temp)); |
ad6ce87e | 260 | temp += packet_length; |
6c54c28e | 261 | } |
ad6ce87e AS |
262 | |
263 | rbu_data.imagesize = length; | |
6c54c28e AS |
264 | |
265 | return rc; | |
266 | } | |
267 | ||
dda8577f | 268 | static int do_packet_read(char *data, struct list_head *ptemp_list, |
e61c0e33 | 269 | int length, int bytes_read, int *list_read_count) |
6c54c28e AS |
270 | { |
271 | void *ptemp_buf; | |
272 | struct packet_data *newpacket = NULL; | |
273 | int bytes_copied = 0; | |
274 | int j = 0; | |
275 | ||
276 | newpacket = list_entry(ptemp_list, struct packet_data, list); | |
277 | *list_read_count += newpacket->length; | |
278 | ||
279 | if (*list_read_count > bytes_read) { | |
280 | /* point to the start of unread data */ | |
281 | j = newpacket->length - (*list_read_count - bytes_read); | |
282 | /* point to the offset in the packet buffer */ | |
283 | ptemp_buf = (u8 *) newpacket->data + j; | |
284 | /* | |
285 | * check if there is enough room in | |
286 | * * the incoming buffer | |
287 | */ | |
288 | if (length > (*list_read_count - bytes_read)) | |
289 | /* | |
290 | * copy what ever is there in this | |
291 | * packet and move on | |
292 | */ | |
293 | bytes_copied = (*list_read_count - bytes_read); | |
294 | else | |
295 | /* copy the remaining */ | |
296 | bytes_copied = length; | |
297 | memcpy(data, ptemp_buf, bytes_copied); | |
298 | } | |
299 | return bytes_copied; | |
300 | } | |
301 | ||
ad6ce87e | 302 | static int packet_read_list(char *data, size_t * pread_length) |
6c54c28e AS |
303 | { |
304 | struct list_head *ptemp_list; | |
305 | int temp_count = 0; | |
306 | int bytes_copied = 0; | |
307 | int bytes_read = 0; | |
308 | int remaining_bytes = 0; | |
309 | char *pdest = data; | |
310 | ||
311 | /* check if we have any packets */ | |
312 | if (0 == rbu_data.num_packets) | |
313 | return -ENOMEM; | |
314 | ||
315 | remaining_bytes = *pread_length; | |
316 | bytes_read = rbu_data.packet_read_count; | |
317 | ||
318 | ptemp_list = (&packet_data_head.list)->next; | |
319 | while (!list_empty(ptemp_list)) { | |
320 | bytes_copied = do_packet_read(pdest, ptemp_list, | |
e61c0e33 | 321 | remaining_bytes, bytes_read, &temp_count); |
6c54c28e AS |
322 | remaining_bytes -= bytes_copied; |
323 | bytes_read += bytes_copied; | |
324 | pdest += bytes_copied; | |
325 | /* | |
326 | * check if we reached end of buffer before reaching the | |
327 | * last packet | |
328 | */ | |
329 | if (remaining_bytes == 0) | |
330 | break; | |
331 | ||
332 | ptemp_list = ptemp_list->next; | |
333 | } | |
334 | /*finally set the bytes read */ | |
335 | *pread_length = bytes_read - rbu_data.packet_read_count; | |
336 | rbu_data.packet_read_count = bytes_read; | |
337 | return 0; | |
338 | } | |
339 | ||
dda8577f | 340 | static void packet_empty_list(void) |
6c54c28e AS |
341 | { |
342 | struct list_head *ptemp_list; | |
343 | struct list_head *pnext_list; | |
344 | struct packet_data *newpacket; | |
345 | ||
346 | ptemp_list = (&packet_data_head.list)->next; | |
347 | while (!list_empty(ptemp_list)) { | |
348 | newpacket = | |
e61c0e33 | 349 | list_entry(ptemp_list, struct packet_data, list); |
6c54c28e AS |
350 | pnext_list = ptemp_list->next; |
351 | list_del(ptemp_list); | |
352 | ptemp_list = pnext_list; | |
353 | /* | |
354 | * zero out the RBU packet memory before freeing | |
355 | * to make sure there are no stale RBU packets left in memory | |
356 | */ | |
357 | memset(newpacket->data, 0, rbu_data.packetsize); | |
d87e8465 SH |
358 | set_memory_wb((unsigned long)newpacket->data, |
359 | 1 << newpacket->ordernum); | |
e61c0e33 AS |
360 | free_pages((unsigned long) newpacket->data, |
361 | newpacket->ordernum); | |
6c54c28e AS |
362 | kfree(newpacket); |
363 | } | |
6c54c28e AS |
364 | rbu_data.packet_read_count = 0; |
365 | rbu_data.num_packets = 0; | |
ad6ce87e | 366 | rbu_data.imagesize = 0; |
6c54c28e AS |
367 | } |
368 | ||
369 | /* | |
370 | * img_update_free: Frees the buffer allocated for storing BIOS image | |
371 | * Always called with lock held and returned with lock held | |
372 | */ | |
dda8577f | 373 | static void img_update_free(void) |
6c54c28e AS |
374 | { |
375 | if (!rbu_data.image_update_buffer) | |
376 | return; | |
377 | /* | |
378 | * zero out this buffer before freeing it to get rid of any stale | |
379 | * BIOS image copied in memory. | |
380 | */ | |
381 | memset(rbu_data.image_update_buffer, 0, | |
e61c0e33 | 382 | rbu_data.image_update_buffer_size); |
6c54c28e AS |
383 | if (rbu_data.dma_alloc == 1) |
384 | dma_free_coherent(NULL, rbu_data.bios_image_size, | |
e61c0e33 | 385 | rbu_data.image_update_buffer, dell_rbu_dmaaddr); |
6c54c28e | 386 | else |
e61c0e33 AS |
387 | free_pages((unsigned long) rbu_data.image_update_buffer, |
388 | rbu_data.image_update_ordernum); | |
6c54c28e AS |
389 | |
390 | /* | |
391 | * Re-initialize the rbu_data variables after a free | |
392 | */ | |
393 | rbu_data.image_update_ordernum = -1; | |
394 | rbu_data.image_update_buffer = NULL; | |
395 | rbu_data.image_update_buffer_size = 0; | |
396 | rbu_data.bios_image_size = 0; | |
397 | rbu_data.dma_alloc = 0; | |
398 | } | |
399 | ||
400 | /* | |
401 | * img_update_realloc: This function allocates the contiguous pages to | |
402 | * accommodate the requested size of data. The memory address and size | |
403 | * values are stored globally and on every call to this function the new | |
404 | * size is checked to see if more data is required than the existing size. | |
405 | * If true the previous memory is freed and new allocation is done to | |
406 | * accommodate the new size. If the incoming size is less then than the | |
407 | * already allocated size, then that memory is reused. This function is | |
408 | * called with lock held and returns with lock held. | |
409 | */ | |
dda8577f | 410 | static int img_update_realloc(unsigned long size) |
6c54c28e AS |
411 | { |
412 | unsigned char *image_update_buffer = NULL; | |
413 | unsigned long rc; | |
414 | unsigned long img_buf_phys_addr; | |
415 | int ordernum; | |
416 | int dma_alloc = 0; | |
417 | ||
418 | /* | |
419 | * check if the buffer of sufficient size has been | |
420 | * already allocated | |
421 | */ | |
422 | if (rbu_data.image_update_buffer_size >= size) { | |
423 | /* | |
424 | * check for corruption | |
425 | */ | |
426 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { | |
427 | printk(KERN_ERR "dell_rbu:%s: corruption " | |
eecd5853 | 428 | "check failed\n", __func__); |
6c54c28e AS |
429 | return -EINVAL; |
430 | } | |
431 | /* | |
432 | * we have a valid pre-allocated buffer with | |
433 | * sufficient size | |
434 | */ | |
435 | return 0; | |
436 | } | |
437 | ||
438 | /* | |
439 | * free any previously allocated buffer | |
440 | */ | |
441 | img_update_free(); | |
442 | ||
443 | spin_unlock(&rbu_data.lock); | |
444 | ||
445 | ordernum = get_order(size); | |
446 | image_update_buffer = | |
e61c0e33 | 447 | (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum); |
6c54c28e AS |
448 | |
449 | img_buf_phys_addr = | |
e61c0e33 | 450 | (unsigned long) virt_to_phys(image_update_buffer); |
6c54c28e AS |
451 | |
452 | if (img_buf_phys_addr > BIOS_SCAN_LIMIT) { | |
e61c0e33 | 453 | free_pages((unsigned long) image_update_buffer, ordernum); |
6c54c28e AS |
454 | ordernum = -1; |
455 | image_update_buffer = dma_alloc_coherent(NULL, size, | |
e61c0e33 | 456 | &dell_rbu_dmaaddr, GFP_KERNEL); |
6c54c28e AS |
457 | dma_alloc = 1; |
458 | } | |
459 | ||
460 | spin_lock(&rbu_data.lock); | |
461 | ||
462 | if (image_update_buffer != NULL) { | |
463 | rbu_data.image_update_buffer = image_update_buffer; | |
464 | rbu_data.image_update_buffer_size = size; | |
465 | rbu_data.bios_image_size = | |
e61c0e33 | 466 | rbu_data.image_update_buffer_size; |
6c54c28e AS |
467 | rbu_data.image_update_ordernum = ordernum; |
468 | rbu_data.dma_alloc = dma_alloc; | |
469 | rc = 0; | |
470 | } else { | |
471 | pr_debug("Not enough memory for image update:" | |
e61c0e33 | 472 | "size = %ld\n", size); |
6c54c28e AS |
473 | rc = -ENOMEM; |
474 | } | |
475 | ||
476 | return rc; | |
477 | } | |
478 | ||
dda8577f | 479 | static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
480 | { |
481 | int retval; | |
482 | size_t bytes_left; | |
483 | size_t data_length; | |
484 | char *ptempBuf = buffer; | |
6c54c28e AS |
485 | |
486 | /* check to see if we have something to return */ | |
487 | if (rbu_data.num_packets == 0) { | |
488 | pr_debug("read_packet_data: no packets written\n"); | |
489 | retval = -ENOMEM; | |
490 | goto read_rbu_data_exit; | |
491 | } | |
492 | ||
ad6ce87e | 493 | if (pos > rbu_data.imagesize) { |
6c54c28e AS |
494 | retval = 0; |
495 | printk(KERN_WARNING "dell_rbu:read_packet_data: " | |
e61c0e33 | 496 | "data underrun\n"); |
6c54c28e AS |
497 | goto read_rbu_data_exit; |
498 | } | |
499 | ||
ad6ce87e | 500 | bytes_left = rbu_data.imagesize - pos; |
6c54c28e AS |
501 | data_length = min(bytes_left, count); |
502 | ||
503 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) | |
504 | goto read_rbu_data_exit; | |
505 | ||
ad6ce87e | 506 | if ((pos + count) > rbu_data.imagesize) { |
6c54c28e AS |
507 | rbu_data.packet_read_count = 0; |
508 | /* this was the last copy */ | |
509 | retval = bytes_left; | |
510 | } else | |
511 | retval = count; | |
512 | ||
513 | read_rbu_data_exit: | |
514 | return retval; | |
515 | } | |
516 | ||
dda8577f | 517 | static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count) |
6c54c28e | 518 | { |
6c54c28e AS |
519 | /* check to see if we have something to return */ |
520 | if ((rbu_data.image_update_buffer == NULL) || | |
e61c0e33 | 521 | (rbu_data.bios_image_size == 0)) { |
6c54c28e | 522 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
e61c0e33 AS |
523 | "bios_image_size %lu\n", |
524 | rbu_data.image_update_buffer, | |
525 | rbu_data.bios_image_size); | |
25377479 | 526 | return -ENOMEM; |
6c54c28e AS |
527 | } |
528 | ||
25377479 AM |
529 | return memory_read_from_buffer(buffer, count, &pos, |
530 | rbu_data.image_update_buffer, rbu_data.bios_image_size); | |
6c54c28e AS |
531 | } |
532 | ||
2c3c8bea | 533 | static ssize_t read_rbu_data(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
534 | struct bin_attribute *bin_attr, |
535 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
536 | { |
537 | ssize_t ret_count = 0; | |
538 | ||
539 | spin_lock(&rbu_data.lock); | |
540 | ||
541 | if (!strcmp(image_type, "mono")) | |
542 | ret_count = read_rbu_mono_data(buffer, pos, count); | |
543 | else if (!strcmp(image_type, "packet")) | |
544 | ret_count = read_packet_data(buffer, pos, count); | |
545 | else | |
546 | pr_debug("read_rbu_data: invalid image type specified\n"); | |
547 | ||
548 | spin_unlock(&rbu_data.lock); | |
549 | return ret_count; | |
550 | } | |
551 | ||
dda8577f | 552 | static void callbackfn_rbu(const struct firmware *fw, void *context) |
e61c0e33 | 553 | { |
2c560840 | 554 | rbu_data.entry_created = 0; |
e61c0e33 | 555 | |
9ebfbd45 | 556 | if (!fw) |
e61c0e33 | 557 | return; |
e61c0e33 | 558 | |
9ebfbd45 JB |
559 | if (!fw->size) |
560 | goto out; | |
561 | ||
e61c0e33 AS |
562 | spin_lock(&rbu_data.lock); |
563 | if (!strcmp(image_type, "mono")) { | |
564 | if (!img_update_realloc(fw->size)) | |
565 | memcpy(rbu_data.image_update_buffer, | |
566 | fw->data, fw->size); | |
567 | } else if (!strcmp(image_type, "packet")) { | |
ad6ce87e AS |
568 | /* |
569 | * we need to free previous packets if a | |
570 | * new hunk of packets needs to be downloaded | |
571 | */ | |
572 | packet_empty_list(); | |
573 | if (packetize_data(fw->data, fw->size)) | |
574 | /* Incase something goes wrong when we are | |
575 | * in middle of packetizing the data, we | |
576 | * need to free up whatever packets might | |
577 | * have been created before we quit. | |
578 | */ | |
e61c0e33 | 579 | packet_empty_list(); |
e61c0e33 AS |
580 | } else |
581 | pr_debug("invalid image type specified.\n"); | |
582 | spin_unlock(&rbu_data.lock); | |
9ebfbd45 JB |
583 | out: |
584 | release_firmware(fw); | |
e61c0e33 AS |
585 | } |
586 | ||
2c3c8bea | 587 | static ssize_t read_rbu_image_type(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
588 | struct bin_attribute *bin_attr, |
589 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
590 | { |
591 | int size = 0; | |
592 | if (!pos) | |
81156928 | 593 | size = scnprintf(buffer, count, "%s\n", image_type); |
6c54c28e AS |
594 | return size; |
595 | } | |
596 | ||
2c3c8bea | 597 | static ssize_t write_rbu_image_type(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
598 | struct bin_attribute *bin_attr, |
599 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
600 | { |
601 | int rc = count; | |
e61c0e33 AS |
602 | int req_firm_rc = 0; |
603 | int i; | |
6c54c28e | 604 | spin_lock(&rbu_data.lock); |
e61c0e33 AS |
605 | /* |
606 | * Find the first newline or space | |
607 | */ | |
608 | for (i = 0; i < count; ++i) | |
609 | if (buffer[i] == '\n' || buffer[i] == ' ') { | |
610 | buffer[i] = '\0'; | |
611 | break; | |
612 | } | |
613 | if (i == count) | |
614 | buffer[count] = '\0'; | |
615 | ||
616 | if (strstr(buffer, "mono")) | |
617 | strcpy(image_type, "mono"); | |
618 | else if (strstr(buffer, "packet")) | |
619 | strcpy(image_type, "packet"); | |
620 | else if (strstr(buffer, "init")) { | |
621 | /* | |
622 | * If due to the user error the driver gets in a bad | |
623 | * state where even though it is loaded , the | |
624 | * /sys/class/firmware/dell_rbu entries are missing. | |
625 | * to cover this situation the user can recreate entries | |
626 | * by writing init to image_type. | |
627 | */ | |
628 | if (!rbu_data.entry_created) { | |
629 | spin_unlock(&rbu_data.lock); | |
630 | req_firm_rc = request_firmware_nowait(THIS_MODULE, | |
631 | FW_ACTION_NOHOTPLUG, "dell_rbu", | |
9ebfbd45 | 632 | &rbu_device->dev, GFP_KERNEL, &context, |
e61c0e33 AS |
633 | callbackfn_rbu); |
634 | if (req_firm_rc) { | |
635 | printk(KERN_ERR | |
636 | "dell_rbu:%s request_firmware_nowait" | |
eecd5853 | 637 | " failed %d\n", __func__, rc); |
e61c0e33 AS |
638 | rc = -EIO; |
639 | } else | |
640 | rbu_data.entry_created = 1; | |
641 | ||
642 | spin_lock(&rbu_data.lock); | |
643 | } | |
644 | } else { | |
645 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); | |
646 | spin_unlock(&rbu_data.lock); | |
647 | return -EINVAL; | |
648 | } | |
6c54c28e AS |
649 | |
650 | /* we must free all previous allocations */ | |
651 | packet_empty_list(); | |
652 | img_update_free(); | |
6c54c28e | 653 | spin_unlock(&rbu_data.lock); |
6c54c28e | 654 | |
e61c0e33 | 655 | return rc; |
6c54c28e AS |
656 | } |
657 | ||
2c3c8bea | 658 | static ssize_t read_rbu_packet_size(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
659 | struct bin_attribute *bin_attr, |
660 | char *buffer, loff_t pos, size_t count) | |
ad6ce87e AS |
661 | { |
662 | int size = 0; | |
663 | if (!pos) { | |
664 | spin_lock(&rbu_data.lock); | |
81156928 | 665 | size = scnprintf(buffer, count, "%lu\n", rbu_data.packetsize); |
ad6ce87e AS |
666 | spin_unlock(&rbu_data.lock); |
667 | } | |
668 | return size; | |
669 | } | |
670 | ||
2c3c8bea | 671 | static ssize_t write_rbu_packet_size(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
672 | struct bin_attribute *bin_attr, |
673 | char *buffer, loff_t pos, size_t count) | |
ad6ce87e AS |
674 | { |
675 | unsigned long temp; | |
676 | spin_lock(&rbu_data.lock); | |
677 | packet_empty_list(); | |
678 | sscanf(buffer, "%lu", &temp); | |
679 | if (temp < 0xffffffff) | |
680 | rbu_data.packetsize = temp; | |
681 | ||
682 | spin_unlock(&rbu_data.lock); | |
683 | return count; | |
684 | } | |
685 | ||
6c54c28e | 686 | static struct bin_attribute rbu_data_attr = { |
7b595756 | 687 | .attr = {.name = "data", .mode = 0444}, |
6c54c28e AS |
688 | .read = read_rbu_data, |
689 | }; | |
690 | ||
691 | static struct bin_attribute rbu_image_type_attr = { | |
7b595756 | 692 | .attr = {.name = "image_type", .mode = 0644}, |
6c54c28e AS |
693 | .read = read_rbu_image_type, |
694 | .write = write_rbu_image_type, | |
695 | }; | |
696 | ||
ad6ce87e | 697 | static struct bin_attribute rbu_packet_size_attr = { |
7b595756 | 698 | .attr = {.name = "packet_size", .mode = 0644}, |
ad6ce87e AS |
699 | .read = read_rbu_packet_size, |
700 | .write = write_rbu_packet_size, | |
701 | }; | |
702 | ||
dda8577f | 703 | static int __init dcdrbu_init(void) |
6c54c28e | 704 | { |
6897083a | 705 | int rc; |
6c54c28e AS |
706 | spin_lock_init(&rbu_data.lock); |
707 | ||
708 | init_packet_head(); | |
6897083a AM |
709 | rbu_device = platform_device_register_simple("dell_rbu", -1, NULL, 0); |
710 | if (IS_ERR(rbu_device)) { | |
6c54c28e | 711 | printk(KERN_ERR |
e61c0e33 | 712 | "dell_rbu:%s:platform_device_register_simple " |
eecd5853 | 713 | "failed\n", __func__); |
6897083a | 714 | return PTR_ERR(rbu_device); |
6c54c28e AS |
715 | } |
716 | ||
41bfcfd9 JG |
717 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); |
718 | if (rc) | |
719 | goto out_devreg; | |
720 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
721 | if (rc) | |
722 | goto out_data; | |
723 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, | |
ad6ce87e | 724 | &rbu_packet_size_attr); |
41bfcfd9 JG |
725 | if (rc) |
726 | goto out_imtype; | |
6c54c28e | 727 | |
2c560840 | 728 | rbu_data.entry_created = 0; |
41bfcfd9 | 729 | return 0; |
6c54c28e | 730 | |
41bfcfd9 JG |
731 | out_imtype: |
732 | sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
733 | out_data: | |
734 | sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); | |
735 | out_devreg: | |
736 | platform_device_unregister(rbu_device); | |
737 | return rc; | |
6c54c28e AS |
738 | } |
739 | ||
dda8577f | 740 | static __exit void dcdrbu_exit(void) |
6c54c28e AS |
741 | { |
742 | spin_lock(&rbu_data.lock); | |
743 | packet_empty_list(); | |
744 | img_update_free(); | |
745 | spin_unlock(&rbu_data.lock); | |
746 | platform_device_unregister(rbu_device); | |
747 | } | |
748 | ||
749 | module_exit(dcdrbu_exit); | |
750 | module_init(dcdrbu_init); | |
274b6933 AS |
751 | |
752 | /* vim:noet:ts=8:sw=8 | |
753 | */ |