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d9523678 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6c54c28e AS |
2 | /* |
3 | * dell_rbu.c | |
4 | * Bios Update driver for Dell systems | |
5 | * Author: Dell Inc | |
6 | * Abhay Salunke <abhay_salunke@dell.com> | |
7 | * | |
8 | * Copyright (C) 2005 Dell Inc. | |
9 | * | |
10 | * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by | |
11 | * creating entries in the /sys file systems on Linux 2.6 and higher | |
12 | * kernels. The driver supports two mechanism to update the BIOS namely | |
13 | * contiguous and packetized. Both these methods still require having some | |
14 | * application to set the CMOS bit indicating the BIOS to update itself | |
15 | * after a reboot. | |
16 | * | |
17 | * Contiguous method: | |
18 | * This driver writes the incoming data in a monolithic image by allocating | |
19 | * contiguous physical pages large enough to accommodate the incoming BIOS | |
20 | * image size. | |
21 | * | |
22 | * Packetized method: | |
23 | * The driver writes the incoming packet image by allocating a new packet | |
24 | * on every time the packet data is written. This driver requires an | |
25 | * application to break the BIOS image in to fixed sized packet chunks. | |
26 | * | |
27 | * See Documentation/dell_rbu.txt for more info. | |
6c54c28e | 28 | */ |
6c54c28e AS |
29 | #include <linux/init.h> |
30 | #include <linux/module.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
6c54c28e AS |
32 | #include <linux/string.h> |
33 | #include <linux/errno.h> | |
34 | #include <linux/blkdev.h> | |
d052d1be | 35 | #include <linux/platform_device.h> |
6c54c28e AS |
36 | #include <linux/spinlock.h> |
37 | #include <linux/moduleparam.h> | |
38 | #include <linux/firmware.h> | |
39 | #include <linux/dma-mapping.h> | |
6aecee6a | 40 | #include <asm/set_memory.h> |
6c54c28e AS |
41 | |
42 | MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>"); | |
43 | MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); | |
44 | MODULE_LICENSE("GPL"); | |
2c560840 | 45 | MODULE_VERSION("3.2"); |
6c54c28e AS |
46 | |
47 | #define BIOS_SCAN_LIMIT 0xffffffff | |
48 | #define MAX_IMAGE_LENGTH 16 | |
49 | static struct _rbu_data { | |
50 | void *image_update_buffer; | |
51 | unsigned long image_update_buffer_size; | |
52 | unsigned long bios_image_size; | |
53 | int image_update_ordernum; | |
6c54c28e AS |
54 | spinlock_t lock; |
55 | unsigned long packet_read_count; | |
6c54c28e AS |
56 | unsigned long num_packets; |
57 | unsigned long packetsize; | |
ad6ce87e | 58 | unsigned long imagesize; |
e61c0e33 | 59 | int entry_created; |
6c54c28e AS |
60 | } rbu_data; |
61 | ||
e61c0e33 AS |
62 | static char image_type[MAX_IMAGE_LENGTH + 1] = "mono"; |
63 | module_param_string(image_type, image_type, sizeof (image_type), 0); | |
ad6ce87e AS |
64 | MODULE_PARM_DESC(image_type, |
65 | "BIOS image type. choose- mono or packet or init"); | |
6c54c28e | 66 | |
274b6933 AS |
67 | static unsigned long allocation_floor = 0x100000; |
68 | module_param(allocation_floor, ulong, 0644); | |
69 | MODULE_PARM_DESC(allocation_floor, | |
70 | "Minimum address for allocations when using Packet mode"); | |
71 | ||
6c54c28e AS |
72 | struct packet_data { |
73 | struct list_head list; | |
74 | size_t length; | |
75 | void *data; | |
76 | int ordernum; | |
77 | }; | |
78 | ||
79 | static struct packet_data packet_data_head; | |
80 | ||
81 | static struct platform_device *rbu_device; | |
82 | static int context; | |
6c54c28e | 83 | |
dda8577f | 84 | static void init_packet_head(void) |
6c54c28e AS |
85 | { |
86 | INIT_LIST_HEAD(&packet_data_head.list); | |
6c54c28e AS |
87 | rbu_data.packet_read_count = 0; |
88 | rbu_data.num_packets = 0; | |
89 | rbu_data.packetsize = 0; | |
ad6ce87e | 90 | rbu_data.imagesize = 0; |
6c54c28e AS |
91 | } |
92 | ||
ad6ce87e | 93 | static int create_packet(void *data, size_t length) |
6c54c28e AS |
94 | { |
95 | struct packet_data *newpacket; | |
96 | int ordernum = 0; | |
274b6933 AS |
97 | int retval = 0; |
98 | unsigned int packet_array_size = 0; | |
5ad9201b AV |
99 | void **invalid_addr_packet_array = NULL; |
100 | void *packet_data_temp_buf = NULL; | |
274b6933 | 101 | unsigned int idx = 0; |
6c54c28e AS |
102 | |
103 | pr_debug("create_packet: entry \n"); | |
104 | ||
105 | if (!rbu_data.packetsize) { | |
106 | pr_debug("create_packet: packetsize not specified\n"); | |
274b6933 AS |
107 | retval = -EINVAL; |
108 | goto out_noalloc; | |
6c54c28e | 109 | } |
274b6933 | 110 | |
e61c0e33 | 111 | spin_unlock(&rbu_data.lock); |
274b6933 AS |
112 | |
113 | newpacket = kzalloc(sizeof (struct packet_data), GFP_KERNEL); | |
6c54c28e | 114 | |
6c54c28e AS |
115 | if (!newpacket) { |
116 | printk(KERN_WARNING | |
e61c0e33 | 117 | "dell_rbu:%s: failed to allocate new " |
eecd5853 | 118 | "packet\n", __func__); |
274b6933 AS |
119 | retval = -ENOMEM; |
120 | spin_lock(&rbu_data.lock); | |
121 | goto out_noalloc; | |
6c54c28e AS |
122 | } |
123 | ||
124 | ordernum = get_order(length); | |
274b6933 | 125 | |
6c54c28e | 126 | /* |
274b6933 AS |
127 | * BIOS errata mean we cannot allocate packets below 1MB or they will |
128 | * be overwritten by BIOS. | |
129 | * | |
130 | * array to temporarily hold packets | |
131 | * that are below the allocation floor | |
132 | * | |
133 | * NOTE: very simplistic because we only need the floor to be at 1MB | |
134 | * due to BIOS errata. This shouldn't be used for higher floors | |
135 | * or you will run out of mem trying to allocate the array. | |
6c54c28e | 136 | */ |
274b6933 AS |
137 | packet_array_size = max( |
138 | (unsigned int)(allocation_floor / rbu_data.packetsize), | |
139 | (unsigned int)1); | |
6396bb22 | 140 | invalid_addr_packet_array = kcalloc(packet_array_size, sizeof(void *), |
274b6933 | 141 | GFP_KERNEL); |
6c54c28e | 142 | |
274b6933 | 143 | if (!invalid_addr_packet_array) { |
6c54c28e | 144 | printk(KERN_WARNING |
274b6933 AS |
145 | "dell_rbu:%s: failed to allocate " |
146 | "invalid_addr_packet_array \n", | |
eecd5853 | 147 | __func__); |
274b6933 AS |
148 | retval = -ENOMEM; |
149 | spin_lock(&rbu_data.lock); | |
150 | goto out_alloc_packet; | |
6c54c28e AS |
151 | } |
152 | ||
274b6933 AS |
153 | while (!packet_data_temp_buf) { |
154 | packet_data_temp_buf = (unsigned char *) | |
155 | __get_free_pages(GFP_KERNEL, ordernum); | |
156 | if (!packet_data_temp_buf) { | |
157 | printk(KERN_WARNING | |
158 | "dell_rbu:%s: failed to allocate new " | |
eecd5853 | 159 | "packet\n", __func__); |
274b6933 AS |
160 | retval = -ENOMEM; |
161 | spin_lock(&rbu_data.lock); | |
162 | goto out_alloc_packet_array; | |
163 | } | |
164 | ||
165 | if ((unsigned long)virt_to_phys(packet_data_temp_buf) | |
166 | < allocation_floor) { | |
167 | pr_debug("packet 0x%lx below floor at 0x%lx.\n", | |
168 | (unsigned long)virt_to_phys( | |
169 | packet_data_temp_buf), | |
170 | allocation_floor); | |
171 | invalid_addr_packet_array[idx++] = packet_data_temp_buf; | |
5ad9201b | 172 | packet_data_temp_buf = NULL; |
274b6933 AS |
173 | } |
174 | } | |
6aecee6a SH |
175 | /* |
176 | * set to uncachable or it may never get written back before reboot | |
177 | */ | |
178 | set_memory_uc((unsigned long)packet_data_temp_buf, 1 << ordernum); | |
179 | ||
274b6933 AS |
180 | spin_lock(&rbu_data.lock); |
181 | ||
182 | newpacket->data = packet_data_temp_buf; | |
183 | ||
184 | pr_debug("create_packet: newpacket at physical addr %lx\n", | |
185 | (unsigned long)virt_to_phys(newpacket->data)); | |
186 | ||
187 | /* packets may not have fixed size */ | |
188 | newpacket->length = length; | |
6c54c28e AS |
189 | newpacket->ordernum = ordernum; |
190 | ++rbu_data.num_packets; | |
274b6933 AS |
191 | |
192 | /* initialize the newly created packet headers */ | |
6c54c28e AS |
193 | INIT_LIST_HEAD(&newpacket->list); |
194 | list_add_tail(&newpacket->list, &packet_data_head.list); | |
ad6ce87e AS |
195 | |
196 | memcpy(newpacket->data, data, length); | |
6c54c28e AS |
197 | |
198 | pr_debug("create_packet: exit \n"); | |
199 | ||
274b6933 AS |
200 | out_alloc_packet_array: |
201 | /* always free packet array */ | |
202 | for (;idx>0;idx--) { | |
203 | pr_debug("freeing unused packet below floor 0x%lx.\n", | |
204 | (unsigned long)virt_to_phys( | |
205 | invalid_addr_packet_array[idx-1])); | |
206 | free_pages((unsigned long)invalid_addr_packet_array[idx-1], | |
207 | ordernum); | |
208 | } | |
209 | kfree(invalid_addr_packet_array); | |
210 | ||
211 | out_alloc_packet: | |
212 | /* if error, free data */ | |
213 | if (retval) | |
214 | kfree(newpacket); | |
215 | ||
216 | out_noalloc: | |
217 | return retval; | |
6c54c28e AS |
218 | } |
219 | ||
c6c1c94e | 220 | static int packetize_data(const u8 *data, size_t length) |
6c54c28e AS |
221 | { |
222 | int rc = 0; | |
ad6ce87e AS |
223 | int done = 0; |
224 | int packet_length; | |
225 | u8 *temp; | |
226 | u8 *end = (u8 *) data + length; | |
cb7cf57a | 227 | pr_debug("packetize_data: data length %zd\n", length); |
ad6ce87e AS |
228 | if (!rbu_data.packetsize) { |
229 | printk(KERN_WARNING | |
230 | "dell_rbu: packetsize not specified\n"); | |
231 | return -EIO; | |
232 | } | |
6c54c28e | 233 | |
ad6ce87e AS |
234 | temp = (u8 *) data; |
235 | ||
236 | /* packetize the hunk */ | |
237 | while (!done) { | |
238 | if ((temp + rbu_data.packetsize) < end) | |
239 | packet_length = rbu_data.packetsize; | |
240 | else { | |
241 | /* this is the last packet */ | |
242 | packet_length = end - temp; | |
243 | done = 1; | |
244 | } | |
245 | ||
246 | if ((rc = create_packet(temp, packet_length))) | |
6c54c28e | 247 | return rc; |
ad6ce87e | 248 | |
9e42ef77 | 249 | pr_debug("%p:%td\n", temp, (end - temp)); |
ad6ce87e | 250 | temp += packet_length; |
6c54c28e | 251 | } |
ad6ce87e AS |
252 | |
253 | rbu_data.imagesize = length; | |
6c54c28e AS |
254 | |
255 | return rc; | |
256 | } | |
257 | ||
dda8577f | 258 | static int do_packet_read(char *data, struct list_head *ptemp_list, |
e61c0e33 | 259 | int length, int bytes_read, int *list_read_count) |
6c54c28e AS |
260 | { |
261 | void *ptemp_buf; | |
262 | struct packet_data *newpacket = NULL; | |
263 | int bytes_copied = 0; | |
264 | int j = 0; | |
265 | ||
266 | newpacket = list_entry(ptemp_list, struct packet_data, list); | |
267 | *list_read_count += newpacket->length; | |
268 | ||
269 | if (*list_read_count > bytes_read) { | |
270 | /* point to the start of unread data */ | |
271 | j = newpacket->length - (*list_read_count - bytes_read); | |
272 | /* point to the offset in the packet buffer */ | |
273 | ptemp_buf = (u8 *) newpacket->data + j; | |
274 | /* | |
275 | * check if there is enough room in | |
276 | * * the incoming buffer | |
277 | */ | |
278 | if (length > (*list_read_count - bytes_read)) | |
279 | /* | |
280 | * copy what ever is there in this | |
281 | * packet and move on | |
282 | */ | |
283 | bytes_copied = (*list_read_count - bytes_read); | |
284 | else | |
285 | /* copy the remaining */ | |
286 | bytes_copied = length; | |
287 | memcpy(data, ptemp_buf, bytes_copied); | |
288 | } | |
289 | return bytes_copied; | |
290 | } | |
291 | ||
ad6ce87e | 292 | static int packet_read_list(char *data, size_t * pread_length) |
6c54c28e AS |
293 | { |
294 | struct list_head *ptemp_list; | |
295 | int temp_count = 0; | |
296 | int bytes_copied = 0; | |
297 | int bytes_read = 0; | |
298 | int remaining_bytes = 0; | |
299 | char *pdest = data; | |
300 | ||
301 | /* check if we have any packets */ | |
302 | if (0 == rbu_data.num_packets) | |
303 | return -ENOMEM; | |
304 | ||
305 | remaining_bytes = *pread_length; | |
306 | bytes_read = rbu_data.packet_read_count; | |
307 | ||
308 | ptemp_list = (&packet_data_head.list)->next; | |
309 | while (!list_empty(ptemp_list)) { | |
310 | bytes_copied = do_packet_read(pdest, ptemp_list, | |
e61c0e33 | 311 | remaining_bytes, bytes_read, &temp_count); |
6c54c28e AS |
312 | remaining_bytes -= bytes_copied; |
313 | bytes_read += bytes_copied; | |
314 | pdest += bytes_copied; | |
315 | /* | |
316 | * check if we reached end of buffer before reaching the | |
317 | * last packet | |
318 | */ | |
319 | if (remaining_bytes == 0) | |
320 | break; | |
321 | ||
322 | ptemp_list = ptemp_list->next; | |
323 | } | |
324 | /*finally set the bytes read */ | |
325 | *pread_length = bytes_read - rbu_data.packet_read_count; | |
326 | rbu_data.packet_read_count = bytes_read; | |
327 | return 0; | |
328 | } | |
329 | ||
dda8577f | 330 | static void packet_empty_list(void) |
6c54c28e AS |
331 | { |
332 | struct list_head *ptemp_list; | |
333 | struct list_head *pnext_list; | |
334 | struct packet_data *newpacket; | |
335 | ||
336 | ptemp_list = (&packet_data_head.list)->next; | |
337 | while (!list_empty(ptemp_list)) { | |
338 | newpacket = | |
e61c0e33 | 339 | list_entry(ptemp_list, struct packet_data, list); |
6c54c28e AS |
340 | pnext_list = ptemp_list->next; |
341 | list_del(ptemp_list); | |
342 | ptemp_list = pnext_list; | |
343 | /* | |
344 | * zero out the RBU packet memory before freeing | |
345 | * to make sure there are no stale RBU packets left in memory | |
346 | */ | |
347 | memset(newpacket->data, 0, rbu_data.packetsize); | |
6aecee6a SH |
348 | set_memory_wb((unsigned long)newpacket->data, |
349 | 1 << newpacket->ordernum); | |
e61c0e33 AS |
350 | free_pages((unsigned long) newpacket->data, |
351 | newpacket->ordernum); | |
6c54c28e AS |
352 | kfree(newpacket); |
353 | } | |
6c54c28e AS |
354 | rbu_data.packet_read_count = 0; |
355 | rbu_data.num_packets = 0; | |
ad6ce87e | 356 | rbu_data.imagesize = 0; |
6c54c28e AS |
357 | } |
358 | ||
359 | /* | |
360 | * img_update_free: Frees the buffer allocated for storing BIOS image | |
361 | * Always called with lock held and returned with lock held | |
362 | */ | |
dda8577f | 363 | static void img_update_free(void) |
6c54c28e AS |
364 | { |
365 | if (!rbu_data.image_update_buffer) | |
366 | return; | |
367 | /* | |
368 | * zero out this buffer before freeing it to get rid of any stale | |
369 | * BIOS image copied in memory. | |
370 | */ | |
371 | memset(rbu_data.image_update_buffer, 0, | |
e61c0e33 | 372 | rbu_data.image_update_buffer_size); |
fd47a36f CH |
373 | free_pages((unsigned long) rbu_data.image_update_buffer, |
374 | rbu_data.image_update_ordernum); | |
6c54c28e AS |
375 | |
376 | /* | |
377 | * Re-initialize the rbu_data variables after a free | |
378 | */ | |
379 | rbu_data.image_update_ordernum = -1; | |
380 | rbu_data.image_update_buffer = NULL; | |
381 | rbu_data.image_update_buffer_size = 0; | |
382 | rbu_data.bios_image_size = 0; | |
6c54c28e AS |
383 | } |
384 | ||
385 | /* | |
386 | * img_update_realloc: This function allocates the contiguous pages to | |
387 | * accommodate the requested size of data. The memory address and size | |
388 | * values are stored globally and on every call to this function the new | |
389 | * size is checked to see if more data is required than the existing size. | |
390 | * If true the previous memory is freed and new allocation is done to | |
391 | * accommodate the new size. If the incoming size is less then than the | |
392 | * already allocated size, then that memory is reused. This function is | |
393 | * called with lock held and returns with lock held. | |
394 | */ | |
dda8577f | 395 | static int img_update_realloc(unsigned long size) |
6c54c28e AS |
396 | { |
397 | unsigned char *image_update_buffer = NULL; | |
6c54c28e AS |
398 | unsigned long img_buf_phys_addr; |
399 | int ordernum; | |
6c54c28e AS |
400 | |
401 | /* | |
402 | * check if the buffer of sufficient size has been | |
403 | * already allocated | |
404 | */ | |
405 | if (rbu_data.image_update_buffer_size >= size) { | |
406 | /* | |
407 | * check for corruption | |
408 | */ | |
409 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { | |
410 | printk(KERN_ERR "dell_rbu:%s: corruption " | |
eecd5853 | 411 | "check failed\n", __func__); |
6c54c28e AS |
412 | return -EINVAL; |
413 | } | |
414 | /* | |
415 | * we have a valid pre-allocated buffer with | |
416 | * sufficient size | |
417 | */ | |
418 | return 0; | |
419 | } | |
420 | ||
421 | /* | |
422 | * free any previously allocated buffer | |
423 | */ | |
424 | img_update_free(); | |
425 | ||
426 | spin_unlock(&rbu_data.lock); | |
427 | ||
428 | ordernum = get_order(size); | |
429 | image_update_buffer = | |
fd47a36f | 430 | (unsigned char *)__get_free_pages(GFP_DMA32, ordernum); |
f27e1d18 | 431 | spin_lock(&rbu_data.lock); |
fd47a36f | 432 | if (!image_update_buffer) { |
6c54c28e | 433 | pr_debug("Not enough memory for image update:" |
e61c0e33 | 434 | "size = %ld\n", size); |
fd47a36f | 435 | return -ENOMEM; |
6c54c28e AS |
436 | } |
437 | ||
fd47a36f CH |
438 | img_buf_phys_addr = (unsigned long)virt_to_phys(image_update_buffer); |
439 | if (WARN_ON_ONCE(img_buf_phys_addr > BIOS_SCAN_LIMIT)) | |
440 | return -EINVAL; /* can't happen per definition */ | |
441 | ||
fd47a36f CH |
442 | rbu_data.image_update_buffer = image_update_buffer; |
443 | rbu_data.image_update_buffer_size = size; | |
444 | rbu_data.bios_image_size = rbu_data.image_update_buffer_size; | |
445 | rbu_data.image_update_ordernum = ordernum; | |
446 | return 0; | |
6c54c28e AS |
447 | } |
448 | ||
dda8577f | 449 | static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count) |
6c54c28e AS |
450 | { |
451 | int retval; | |
452 | size_t bytes_left; | |
453 | size_t data_length; | |
454 | char *ptempBuf = buffer; | |
6c54c28e AS |
455 | |
456 | /* check to see if we have something to return */ | |
457 | if (rbu_data.num_packets == 0) { | |
458 | pr_debug("read_packet_data: no packets written\n"); | |
459 | retval = -ENOMEM; | |
460 | goto read_rbu_data_exit; | |
461 | } | |
462 | ||
ad6ce87e | 463 | if (pos > rbu_data.imagesize) { |
6c54c28e AS |
464 | retval = 0; |
465 | printk(KERN_WARNING "dell_rbu:read_packet_data: " | |
e61c0e33 | 466 | "data underrun\n"); |
6c54c28e AS |
467 | goto read_rbu_data_exit; |
468 | } | |
469 | ||
ad6ce87e | 470 | bytes_left = rbu_data.imagesize - pos; |
6c54c28e AS |
471 | data_length = min(bytes_left, count); |
472 | ||
473 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) | |
474 | goto read_rbu_data_exit; | |
475 | ||
ad6ce87e | 476 | if ((pos + count) > rbu_data.imagesize) { |
6c54c28e AS |
477 | rbu_data.packet_read_count = 0; |
478 | /* this was the last copy */ | |
479 | retval = bytes_left; | |
480 | } else | |
481 | retval = count; | |
482 | ||
483 | read_rbu_data_exit: | |
484 | return retval; | |
485 | } | |
486 | ||
dda8577f | 487 | static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count) |
6c54c28e | 488 | { |
6c54c28e AS |
489 | /* check to see if we have something to return */ |
490 | if ((rbu_data.image_update_buffer == NULL) || | |
e61c0e33 | 491 | (rbu_data.bios_image_size == 0)) { |
6c54c28e | 492 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
e61c0e33 AS |
493 | "bios_image_size %lu\n", |
494 | rbu_data.image_update_buffer, | |
495 | rbu_data.bios_image_size); | |
25377479 | 496 | return -ENOMEM; |
6c54c28e AS |
497 | } |
498 | ||
25377479 AM |
499 | return memory_read_from_buffer(buffer, count, &pos, |
500 | rbu_data.image_update_buffer, rbu_data.bios_image_size); | |
6c54c28e AS |
501 | } |
502 | ||
2c3c8bea | 503 | static ssize_t read_rbu_data(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
504 | struct bin_attribute *bin_attr, |
505 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
506 | { |
507 | ssize_t ret_count = 0; | |
508 | ||
509 | spin_lock(&rbu_data.lock); | |
510 | ||
511 | if (!strcmp(image_type, "mono")) | |
512 | ret_count = read_rbu_mono_data(buffer, pos, count); | |
513 | else if (!strcmp(image_type, "packet")) | |
514 | ret_count = read_packet_data(buffer, pos, count); | |
515 | else | |
516 | pr_debug("read_rbu_data: invalid image type specified\n"); | |
517 | ||
518 | spin_unlock(&rbu_data.lock); | |
519 | return ret_count; | |
520 | } | |
521 | ||
dda8577f | 522 | static void callbackfn_rbu(const struct firmware *fw, void *context) |
e61c0e33 | 523 | { |
2c560840 | 524 | rbu_data.entry_created = 0; |
e61c0e33 | 525 | |
9ebfbd45 | 526 | if (!fw) |
e61c0e33 | 527 | return; |
e61c0e33 | 528 | |
9ebfbd45 JB |
529 | if (!fw->size) |
530 | goto out; | |
531 | ||
e61c0e33 AS |
532 | spin_lock(&rbu_data.lock); |
533 | if (!strcmp(image_type, "mono")) { | |
534 | if (!img_update_realloc(fw->size)) | |
535 | memcpy(rbu_data.image_update_buffer, | |
536 | fw->data, fw->size); | |
537 | } else if (!strcmp(image_type, "packet")) { | |
ad6ce87e AS |
538 | /* |
539 | * we need to free previous packets if a | |
540 | * new hunk of packets needs to be downloaded | |
541 | */ | |
542 | packet_empty_list(); | |
543 | if (packetize_data(fw->data, fw->size)) | |
544 | /* Incase something goes wrong when we are | |
545 | * in middle of packetizing the data, we | |
546 | * need to free up whatever packets might | |
547 | * have been created before we quit. | |
548 | */ | |
e61c0e33 | 549 | packet_empty_list(); |
e61c0e33 AS |
550 | } else |
551 | pr_debug("invalid image type specified.\n"); | |
552 | spin_unlock(&rbu_data.lock); | |
9ebfbd45 JB |
553 | out: |
554 | release_firmware(fw); | |
e61c0e33 AS |
555 | } |
556 | ||
2c3c8bea | 557 | static ssize_t read_rbu_image_type(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
558 | struct bin_attribute *bin_attr, |
559 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
560 | { |
561 | int size = 0; | |
562 | if (!pos) | |
81156928 | 563 | size = scnprintf(buffer, count, "%s\n", image_type); |
6c54c28e AS |
564 | return size; |
565 | } | |
566 | ||
2c3c8bea | 567 | static ssize_t write_rbu_image_type(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
568 | struct bin_attribute *bin_attr, |
569 | char *buffer, loff_t pos, size_t count) | |
6c54c28e AS |
570 | { |
571 | int rc = count; | |
e61c0e33 AS |
572 | int req_firm_rc = 0; |
573 | int i; | |
6c54c28e | 574 | spin_lock(&rbu_data.lock); |
e61c0e33 AS |
575 | /* |
576 | * Find the first newline or space | |
577 | */ | |
578 | for (i = 0; i < count; ++i) | |
579 | if (buffer[i] == '\n' || buffer[i] == ' ') { | |
580 | buffer[i] = '\0'; | |
581 | break; | |
582 | } | |
583 | if (i == count) | |
584 | buffer[count] = '\0'; | |
585 | ||
586 | if (strstr(buffer, "mono")) | |
587 | strcpy(image_type, "mono"); | |
588 | else if (strstr(buffer, "packet")) | |
589 | strcpy(image_type, "packet"); | |
590 | else if (strstr(buffer, "init")) { | |
591 | /* | |
592 | * If due to the user error the driver gets in a bad | |
593 | * state where even though it is loaded , the | |
594 | * /sys/class/firmware/dell_rbu entries are missing. | |
595 | * to cover this situation the user can recreate entries | |
596 | * by writing init to image_type. | |
597 | */ | |
598 | if (!rbu_data.entry_created) { | |
599 | spin_unlock(&rbu_data.lock); | |
600 | req_firm_rc = request_firmware_nowait(THIS_MODULE, | |
601 | FW_ACTION_NOHOTPLUG, "dell_rbu", | |
9ebfbd45 | 602 | &rbu_device->dev, GFP_KERNEL, &context, |
e61c0e33 AS |
603 | callbackfn_rbu); |
604 | if (req_firm_rc) { | |
605 | printk(KERN_ERR | |
606 | "dell_rbu:%s request_firmware_nowait" | |
eecd5853 | 607 | " failed %d\n", __func__, rc); |
e61c0e33 AS |
608 | rc = -EIO; |
609 | } else | |
610 | rbu_data.entry_created = 1; | |
611 | ||
612 | spin_lock(&rbu_data.lock); | |
613 | } | |
614 | } else { | |
615 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); | |
616 | spin_unlock(&rbu_data.lock); | |
617 | return -EINVAL; | |
618 | } | |
6c54c28e AS |
619 | |
620 | /* we must free all previous allocations */ | |
621 | packet_empty_list(); | |
622 | img_update_free(); | |
6c54c28e | 623 | spin_unlock(&rbu_data.lock); |
6c54c28e | 624 | |
e61c0e33 | 625 | return rc; |
6c54c28e AS |
626 | } |
627 | ||
2c3c8bea | 628 | static ssize_t read_rbu_packet_size(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
629 | struct bin_attribute *bin_attr, |
630 | char *buffer, loff_t pos, size_t count) | |
ad6ce87e AS |
631 | { |
632 | int size = 0; | |
633 | if (!pos) { | |
634 | spin_lock(&rbu_data.lock); | |
81156928 | 635 | size = scnprintf(buffer, count, "%lu\n", rbu_data.packetsize); |
ad6ce87e AS |
636 | spin_unlock(&rbu_data.lock); |
637 | } | |
638 | return size; | |
639 | } | |
640 | ||
2c3c8bea | 641 | static ssize_t write_rbu_packet_size(struct file *filp, struct kobject *kobj, |
91a69029 ZR |
642 | struct bin_attribute *bin_attr, |
643 | char *buffer, loff_t pos, size_t count) | |
ad6ce87e AS |
644 | { |
645 | unsigned long temp; | |
646 | spin_lock(&rbu_data.lock); | |
647 | packet_empty_list(); | |
648 | sscanf(buffer, "%lu", &temp); | |
649 | if (temp < 0xffffffff) | |
650 | rbu_data.packetsize = temp; | |
651 | ||
652 | spin_unlock(&rbu_data.lock); | |
653 | return count; | |
654 | } | |
655 | ||
6c54c28e | 656 | static struct bin_attribute rbu_data_attr = { |
7b595756 | 657 | .attr = {.name = "data", .mode = 0444}, |
6c54c28e AS |
658 | .read = read_rbu_data, |
659 | }; | |
660 | ||
661 | static struct bin_attribute rbu_image_type_attr = { | |
7b595756 | 662 | .attr = {.name = "image_type", .mode = 0644}, |
6c54c28e AS |
663 | .read = read_rbu_image_type, |
664 | .write = write_rbu_image_type, | |
665 | }; | |
666 | ||
ad6ce87e | 667 | static struct bin_attribute rbu_packet_size_attr = { |
7b595756 | 668 | .attr = {.name = "packet_size", .mode = 0644}, |
ad6ce87e AS |
669 | .read = read_rbu_packet_size, |
670 | .write = write_rbu_packet_size, | |
671 | }; | |
672 | ||
dda8577f | 673 | static int __init dcdrbu_init(void) |
6c54c28e | 674 | { |
6897083a | 675 | int rc; |
6c54c28e AS |
676 | spin_lock_init(&rbu_data.lock); |
677 | ||
678 | init_packet_head(); | |
6897083a AM |
679 | rbu_device = platform_device_register_simple("dell_rbu", -1, NULL, 0); |
680 | if (IS_ERR(rbu_device)) { | |
6c54c28e | 681 | printk(KERN_ERR |
e61c0e33 | 682 | "dell_rbu:%s:platform_device_register_simple " |
eecd5853 | 683 | "failed\n", __func__); |
6897083a | 684 | return PTR_ERR(rbu_device); |
6c54c28e AS |
685 | } |
686 | ||
41bfcfd9 JG |
687 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); |
688 | if (rc) | |
689 | goto out_devreg; | |
690 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
691 | if (rc) | |
692 | goto out_data; | |
693 | rc = sysfs_create_bin_file(&rbu_device->dev.kobj, | |
ad6ce87e | 694 | &rbu_packet_size_attr); |
41bfcfd9 JG |
695 | if (rc) |
696 | goto out_imtype; | |
6c54c28e | 697 | |
2c560840 | 698 | rbu_data.entry_created = 0; |
41bfcfd9 | 699 | return 0; |
6c54c28e | 700 | |
41bfcfd9 JG |
701 | out_imtype: |
702 | sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); | |
703 | out_data: | |
704 | sysfs_remove_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); | |
705 | out_devreg: | |
706 | platform_device_unregister(rbu_device); | |
707 | return rc; | |
6c54c28e AS |
708 | } |
709 | ||
dda8577f | 710 | static __exit void dcdrbu_exit(void) |
6c54c28e AS |
711 | { |
712 | spin_lock(&rbu_data.lock); | |
713 | packet_empty_list(); | |
714 | img_update_free(); | |
715 | spin_unlock(&rbu_data.lock); | |
716 | platform_device_unregister(rbu_device); | |
717 | } | |
718 | ||
719 | module_exit(dcdrbu_exit); | |
720 | module_init(dcdrbu_init); | |
274b6933 AS |
721 | |
722 | /* vim:noet:ts=8:sw=8 | |
723 | */ |