Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dell_rbu.c |
| 3 | * Bios Update driver for Dell systems |
| 4 | * Author: Dell Inc |
| 5 | * Abhay Salunke <abhay_salunke@dell.com> |
| 6 | * |
| 7 | * Copyright (C) 2005 Dell Inc. |
| 8 | * |
| 9 | * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by |
| 10 | * creating entries in the /sys file systems on Linux 2.6 and higher |
| 11 | * kernels. The driver supports two mechanism to update the BIOS namely |
| 12 | * contiguous and packetized. Both these methods still require having some |
| 13 | * application to set the CMOS bit indicating the BIOS to update itself |
| 14 | * after a reboot. |
| 15 | * |
| 16 | * Contiguous method: |
| 17 | * This driver writes the incoming data in a monolithic image by allocating |
| 18 | * contiguous physical pages large enough to accommodate the incoming BIOS |
| 19 | * image size. |
| 20 | * |
| 21 | * Packetized method: |
| 22 | * The driver writes the incoming packet image by allocating a new packet |
| 23 | * on every time the packet data is written. This driver requires an |
| 24 | * application to break the BIOS image in to fixed sized packet chunks. |
| 25 | * |
| 26 | * See Documentation/dell_rbu.txt for more info. |
| 27 | * |
| 28 | * This program is free software; you can redistribute it and/or modify |
| 29 | * it under the terms of the GNU General Public License v2.0 as published by |
| 30 | * the Free Software Foundation |
| 31 | * |
| 32 | * This program is distributed in the hope that it will be useful, |
| 33 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 34 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 35 | * GNU General Public License for more details. |
| 36 | */ |
| 37 | #include <linux/version.h> |
| 38 | #include <linux/config.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/module.h> |
| 41 | #include <linux/string.h> |
| 42 | #include <linux/errno.h> |
| 43 | #include <linux/blkdev.h> |
| 44 | #include <linux/device.h> |
| 45 | #include <linux/spinlock.h> |
| 46 | #include <linux/moduleparam.h> |
| 47 | #include <linux/firmware.h> |
| 48 | #include <linux/dma-mapping.h> |
| 49 | |
| 50 | MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>"); |
| 51 | MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); |
| 52 | MODULE_LICENSE("GPL"); |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 53 | MODULE_VERSION("2.0"); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 54 | |
| 55 | #define BIOS_SCAN_LIMIT 0xffffffff |
| 56 | #define MAX_IMAGE_LENGTH 16 |
| 57 | static struct _rbu_data { |
| 58 | void *image_update_buffer; |
| 59 | unsigned long image_update_buffer_size; |
| 60 | unsigned long bios_image_size; |
| 61 | int image_update_ordernum; |
| 62 | int dma_alloc; |
| 63 | spinlock_t lock; |
| 64 | unsigned long packet_read_count; |
| 65 | unsigned long packet_write_count; |
| 66 | unsigned long num_packets; |
| 67 | unsigned long packetsize; |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 68 | int entry_created; |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 69 | } rbu_data; |
| 70 | |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 71 | static char image_type[MAX_IMAGE_LENGTH + 1] = "mono"; |
| 72 | module_param_string(image_type, image_type, sizeof (image_type), 0); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 73 | MODULE_PARM_DESC(image_type, "BIOS image type. choose- mono or packet"); |
| 74 | |
| 75 | struct packet_data { |
| 76 | struct list_head list; |
| 77 | size_t length; |
| 78 | void *data; |
| 79 | int ordernum; |
| 80 | }; |
| 81 | |
| 82 | static struct packet_data packet_data_head; |
| 83 | |
| 84 | static struct platform_device *rbu_device; |
| 85 | static int context; |
| 86 | static dma_addr_t dell_rbu_dmaaddr; |
| 87 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 88 | static void init_packet_head(void) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 89 | { |
| 90 | INIT_LIST_HEAD(&packet_data_head.list); |
| 91 | rbu_data.packet_write_count = 0; |
| 92 | rbu_data.packet_read_count = 0; |
| 93 | rbu_data.num_packets = 0; |
| 94 | rbu_data.packetsize = 0; |
| 95 | } |
| 96 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 97 | static int fill_last_packet(void *data, size_t length) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 98 | { |
| 99 | struct list_head *ptemp_list; |
| 100 | struct packet_data *packet = NULL; |
| 101 | int packet_count = 0; |
| 102 | |
| 103 | pr_debug("fill_last_packet: entry \n"); |
| 104 | |
| 105 | if (!rbu_data.num_packets) { |
| 106 | pr_debug("fill_last_packet: num_packets=0\n"); |
| 107 | return -ENOMEM; |
| 108 | } |
| 109 | |
| 110 | packet_count = rbu_data.num_packets; |
| 111 | |
| 112 | ptemp_list = (&packet_data_head.list)->prev; |
| 113 | |
| 114 | packet = list_entry(ptemp_list, struct packet_data, list); |
| 115 | |
| 116 | if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) { |
| 117 | pr_debug("dell_rbu:%s: packet size data " |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 118 | "overrun\n", __FUNCTION__); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 119 | return -EINVAL; |
| 120 | } |
| 121 | |
| 122 | pr_debug("fill_last_packet : buffer = %p\n", packet->data); |
| 123 | |
| 124 | memcpy((packet->data + rbu_data.packet_write_count), data, length); |
| 125 | |
| 126 | if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) { |
| 127 | /* |
| 128 | * this was the last data chunk in the packet |
| 129 | * so reinitialize the packet data counter to zero |
| 130 | */ |
| 131 | rbu_data.packet_write_count = 0; |
| 132 | } else |
| 133 | rbu_data.packet_write_count += length; |
| 134 | |
| 135 | pr_debug("fill_last_packet: exit \n"); |
| 136 | return 0; |
| 137 | } |
| 138 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 139 | static int create_packet(size_t length) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 140 | { |
| 141 | struct packet_data *newpacket; |
| 142 | int ordernum = 0; |
| 143 | |
| 144 | pr_debug("create_packet: entry \n"); |
| 145 | |
| 146 | if (!rbu_data.packetsize) { |
| 147 | pr_debug("create_packet: packetsize not specified\n"); |
| 148 | return -EINVAL; |
| 149 | } |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 150 | spin_unlock(&rbu_data.lock); |
| 151 | newpacket = kmalloc(sizeof (struct packet_data), GFP_KERNEL); |
| 152 | spin_lock(&rbu_data.lock); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 153 | |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 154 | if (!newpacket) { |
| 155 | printk(KERN_WARNING |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 156 | "dell_rbu:%s: failed to allocate new " |
| 157 | "packet\n", __FUNCTION__); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 158 | return -ENOMEM; |
| 159 | } |
| 160 | |
| 161 | ordernum = get_order(length); |
| 162 | /* |
| 163 | * there is no upper limit on memory |
| 164 | * address for packetized mechanism |
| 165 | */ |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 166 | spin_unlock(&rbu_data.lock); |
| 167 | newpacket->data = (unsigned char *) __get_free_pages(GFP_KERNEL, |
| 168 | ordernum); |
| 169 | spin_lock(&rbu_data.lock); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 170 | |
| 171 | pr_debug("create_packet: newpacket %p\n", newpacket->data); |
| 172 | |
| 173 | if (!newpacket->data) { |
| 174 | printk(KERN_WARNING |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 175 | "dell_rbu:%s: failed to allocate new " |
| 176 | "packet\n", __FUNCTION__); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 177 | kfree(newpacket); |
| 178 | return -ENOMEM; |
| 179 | } |
| 180 | |
| 181 | newpacket->ordernum = ordernum; |
| 182 | ++rbu_data.num_packets; |
| 183 | /* |
| 184 | * initialize the newly created packet headers |
| 185 | */ |
| 186 | INIT_LIST_HEAD(&newpacket->list); |
| 187 | list_add_tail(&newpacket->list, &packet_data_head.list); |
| 188 | /* |
| 189 | * packets have fixed size |
| 190 | */ |
| 191 | newpacket->length = rbu_data.packetsize; |
| 192 | |
| 193 | pr_debug("create_packet: exit \n"); |
| 194 | |
| 195 | return 0; |
| 196 | } |
| 197 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 198 | static int packetize_data(void *data, size_t length) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 199 | { |
| 200 | int rc = 0; |
| 201 | |
| 202 | if (!rbu_data.packet_write_count) { |
| 203 | if ((rc = create_packet(length))) |
| 204 | return rc; |
| 205 | } |
| 206 | if ((rc = fill_last_packet(data, length))) |
| 207 | return rc; |
| 208 | |
| 209 | return rc; |
| 210 | } |
| 211 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 212 | static int do_packet_read(char *data, struct list_head *ptemp_list, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 213 | int length, int bytes_read, int *list_read_count) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 214 | { |
| 215 | void *ptemp_buf; |
| 216 | struct packet_data *newpacket = NULL; |
| 217 | int bytes_copied = 0; |
| 218 | int j = 0; |
| 219 | |
| 220 | newpacket = list_entry(ptemp_list, struct packet_data, list); |
| 221 | *list_read_count += newpacket->length; |
| 222 | |
| 223 | if (*list_read_count > bytes_read) { |
| 224 | /* point to the start of unread data */ |
| 225 | j = newpacket->length - (*list_read_count - bytes_read); |
| 226 | /* point to the offset in the packet buffer */ |
| 227 | ptemp_buf = (u8 *) newpacket->data + j; |
| 228 | /* |
| 229 | * check if there is enough room in |
| 230 | * * the incoming buffer |
| 231 | */ |
| 232 | if (length > (*list_read_count - bytes_read)) |
| 233 | /* |
| 234 | * copy what ever is there in this |
| 235 | * packet and move on |
| 236 | */ |
| 237 | bytes_copied = (*list_read_count - bytes_read); |
| 238 | else |
| 239 | /* copy the remaining */ |
| 240 | bytes_copied = length; |
| 241 | memcpy(data, ptemp_buf, bytes_copied); |
| 242 | } |
| 243 | return bytes_copied; |
| 244 | } |
| 245 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 246 | static int packet_read_list(char *data, size_t *pread_length) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 247 | { |
| 248 | struct list_head *ptemp_list; |
| 249 | int temp_count = 0; |
| 250 | int bytes_copied = 0; |
| 251 | int bytes_read = 0; |
| 252 | int remaining_bytes = 0; |
| 253 | char *pdest = data; |
| 254 | |
| 255 | /* check if we have any packets */ |
| 256 | if (0 == rbu_data.num_packets) |
| 257 | return -ENOMEM; |
| 258 | |
| 259 | remaining_bytes = *pread_length; |
| 260 | bytes_read = rbu_data.packet_read_count; |
| 261 | |
| 262 | ptemp_list = (&packet_data_head.list)->next; |
| 263 | while (!list_empty(ptemp_list)) { |
| 264 | bytes_copied = do_packet_read(pdest, ptemp_list, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 265 | remaining_bytes, bytes_read, &temp_count); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 266 | remaining_bytes -= bytes_copied; |
| 267 | bytes_read += bytes_copied; |
| 268 | pdest += bytes_copied; |
| 269 | /* |
| 270 | * check if we reached end of buffer before reaching the |
| 271 | * last packet |
| 272 | */ |
| 273 | if (remaining_bytes == 0) |
| 274 | break; |
| 275 | |
| 276 | ptemp_list = ptemp_list->next; |
| 277 | } |
| 278 | /*finally set the bytes read */ |
| 279 | *pread_length = bytes_read - rbu_data.packet_read_count; |
| 280 | rbu_data.packet_read_count = bytes_read; |
| 281 | return 0; |
| 282 | } |
| 283 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 284 | static void packet_empty_list(void) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 285 | { |
| 286 | struct list_head *ptemp_list; |
| 287 | struct list_head *pnext_list; |
| 288 | struct packet_data *newpacket; |
| 289 | |
| 290 | ptemp_list = (&packet_data_head.list)->next; |
| 291 | while (!list_empty(ptemp_list)) { |
| 292 | newpacket = |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 293 | list_entry(ptemp_list, struct packet_data, list); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 294 | pnext_list = ptemp_list->next; |
| 295 | list_del(ptemp_list); |
| 296 | ptemp_list = pnext_list; |
| 297 | /* |
| 298 | * zero out the RBU packet memory before freeing |
| 299 | * to make sure there are no stale RBU packets left in memory |
| 300 | */ |
| 301 | memset(newpacket->data, 0, rbu_data.packetsize); |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 302 | free_pages((unsigned long) newpacket->data, |
| 303 | newpacket->ordernum); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 304 | kfree(newpacket); |
| 305 | } |
| 306 | rbu_data.packet_write_count = 0; |
| 307 | rbu_data.packet_read_count = 0; |
| 308 | rbu_data.num_packets = 0; |
| 309 | rbu_data.packetsize = 0; |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * img_update_free: Frees the buffer allocated for storing BIOS image |
| 314 | * Always called with lock held and returned with lock held |
| 315 | */ |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 316 | static void img_update_free(void) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 317 | { |
| 318 | if (!rbu_data.image_update_buffer) |
| 319 | return; |
| 320 | /* |
| 321 | * zero out this buffer before freeing it to get rid of any stale |
| 322 | * BIOS image copied in memory. |
| 323 | */ |
| 324 | memset(rbu_data.image_update_buffer, 0, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 325 | rbu_data.image_update_buffer_size); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 326 | if (rbu_data.dma_alloc == 1) |
| 327 | dma_free_coherent(NULL, rbu_data.bios_image_size, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 328 | rbu_data.image_update_buffer, dell_rbu_dmaaddr); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 329 | else |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 330 | free_pages((unsigned long) rbu_data.image_update_buffer, |
| 331 | rbu_data.image_update_ordernum); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 332 | |
| 333 | /* |
| 334 | * Re-initialize the rbu_data variables after a free |
| 335 | */ |
| 336 | rbu_data.image_update_ordernum = -1; |
| 337 | rbu_data.image_update_buffer = NULL; |
| 338 | rbu_data.image_update_buffer_size = 0; |
| 339 | rbu_data.bios_image_size = 0; |
| 340 | rbu_data.dma_alloc = 0; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * img_update_realloc: This function allocates the contiguous pages to |
| 345 | * accommodate the requested size of data. The memory address and size |
| 346 | * values are stored globally and on every call to this function the new |
| 347 | * size is checked to see if more data is required than the existing size. |
| 348 | * If true the previous memory is freed and new allocation is done to |
| 349 | * accommodate the new size. If the incoming size is less then than the |
| 350 | * already allocated size, then that memory is reused. This function is |
| 351 | * called with lock held and returns with lock held. |
| 352 | */ |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 353 | static int img_update_realloc(unsigned long size) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 354 | { |
| 355 | unsigned char *image_update_buffer = NULL; |
| 356 | unsigned long rc; |
| 357 | unsigned long img_buf_phys_addr; |
| 358 | int ordernum; |
| 359 | int dma_alloc = 0; |
| 360 | |
| 361 | /* |
| 362 | * check if the buffer of sufficient size has been |
| 363 | * already allocated |
| 364 | */ |
| 365 | if (rbu_data.image_update_buffer_size >= size) { |
| 366 | /* |
| 367 | * check for corruption |
| 368 | */ |
| 369 | if ((size != 0) && (rbu_data.image_update_buffer == NULL)) { |
| 370 | printk(KERN_ERR "dell_rbu:%s: corruption " |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 371 | "check failed\n", __FUNCTION__); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 372 | return -EINVAL; |
| 373 | } |
| 374 | /* |
| 375 | * we have a valid pre-allocated buffer with |
| 376 | * sufficient size |
| 377 | */ |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * free any previously allocated buffer |
| 383 | */ |
| 384 | img_update_free(); |
| 385 | |
| 386 | spin_unlock(&rbu_data.lock); |
| 387 | |
| 388 | ordernum = get_order(size); |
| 389 | image_update_buffer = |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 390 | (unsigned char *) __get_free_pages(GFP_KERNEL, ordernum); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 391 | |
| 392 | img_buf_phys_addr = |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 393 | (unsigned long) virt_to_phys(image_update_buffer); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 394 | |
| 395 | if (img_buf_phys_addr > BIOS_SCAN_LIMIT) { |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 396 | free_pages((unsigned long) image_update_buffer, ordernum); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 397 | ordernum = -1; |
| 398 | image_update_buffer = dma_alloc_coherent(NULL, size, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 399 | &dell_rbu_dmaaddr, GFP_KERNEL); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 400 | dma_alloc = 1; |
| 401 | } |
| 402 | |
| 403 | spin_lock(&rbu_data.lock); |
| 404 | |
| 405 | if (image_update_buffer != NULL) { |
| 406 | rbu_data.image_update_buffer = image_update_buffer; |
| 407 | rbu_data.image_update_buffer_size = size; |
| 408 | rbu_data.bios_image_size = |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 409 | rbu_data.image_update_buffer_size; |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 410 | rbu_data.image_update_ordernum = ordernum; |
| 411 | rbu_data.dma_alloc = dma_alloc; |
| 412 | rc = 0; |
| 413 | } else { |
| 414 | pr_debug("Not enough memory for image update:" |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 415 | "size = %ld\n", size); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 416 | rc = -ENOMEM; |
| 417 | } |
| 418 | |
| 419 | return rc; |
| 420 | } |
| 421 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 422 | static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 423 | { |
| 424 | int retval; |
| 425 | size_t bytes_left; |
| 426 | size_t data_length; |
| 427 | char *ptempBuf = buffer; |
| 428 | unsigned long imagesize; |
| 429 | |
| 430 | /* check to see if we have something to return */ |
| 431 | if (rbu_data.num_packets == 0) { |
| 432 | pr_debug("read_packet_data: no packets written\n"); |
| 433 | retval = -ENOMEM; |
| 434 | goto read_rbu_data_exit; |
| 435 | } |
| 436 | |
| 437 | imagesize = rbu_data.num_packets * rbu_data.packetsize; |
| 438 | |
| 439 | if (pos > imagesize) { |
| 440 | retval = 0; |
| 441 | printk(KERN_WARNING "dell_rbu:read_packet_data: " |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 442 | "data underrun\n"); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 443 | goto read_rbu_data_exit; |
| 444 | } |
| 445 | |
| 446 | bytes_left = imagesize - pos; |
| 447 | data_length = min(bytes_left, count); |
| 448 | |
| 449 | if ((retval = packet_read_list(ptempBuf, &data_length)) < 0) |
| 450 | goto read_rbu_data_exit; |
| 451 | |
| 452 | if ((pos + count) > imagesize) { |
| 453 | rbu_data.packet_read_count = 0; |
| 454 | /* this was the last copy */ |
| 455 | retval = bytes_left; |
| 456 | } else |
| 457 | retval = count; |
| 458 | |
| 459 | read_rbu_data_exit: |
| 460 | return retval; |
| 461 | } |
| 462 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 463 | static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 464 | { |
| 465 | unsigned char *ptemp = NULL; |
| 466 | size_t bytes_left = 0; |
| 467 | size_t data_length = 0; |
| 468 | ssize_t ret_count = 0; |
| 469 | |
| 470 | /* check to see if we have something to return */ |
| 471 | if ((rbu_data.image_update_buffer == NULL) || |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 472 | (rbu_data.bios_image_size == 0)) { |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 473 | pr_debug("read_rbu_data_mono: image_update_buffer %p ," |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 474 | "bios_image_size %lu\n", |
| 475 | rbu_data.image_update_buffer, |
| 476 | rbu_data.bios_image_size); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 477 | ret_count = -ENOMEM; |
| 478 | goto read_rbu_data_exit; |
| 479 | } |
| 480 | |
| 481 | if (pos > rbu_data.bios_image_size) { |
| 482 | ret_count = 0; |
| 483 | goto read_rbu_data_exit; |
| 484 | } |
| 485 | |
| 486 | bytes_left = rbu_data.bios_image_size - pos; |
| 487 | data_length = min(bytes_left, count); |
| 488 | |
| 489 | ptemp = rbu_data.image_update_buffer; |
| 490 | memcpy(buffer, (ptemp + pos), data_length); |
| 491 | |
| 492 | if ((pos + count) > rbu_data.bios_image_size) |
| 493 | /* this was the last copy */ |
| 494 | ret_count = bytes_left; |
| 495 | else |
| 496 | ret_count = count; |
| 497 | read_rbu_data_exit: |
| 498 | return ret_count; |
| 499 | } |
| 500 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 501 | static ssize_t read_rbu_data(struct kobject *kobj, char *buffer, |
| 502 | loff_t pos, size_t count) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 503 | { |
| 504 | ssize_t ret_count = 0; |
| 505 | |
| 506 | spin_lock(&rbu_data.lock); |
| 507 | |
| 508 | if (!strcmp(image_type, "mono")) |
| 509 | ret_count = read_rbu_mono_data(buffer, pos, count); |
| 510 | else if (!strcmp(image_type, "packet")) |
| 511 | ret_count = read_packet_data(buffer, pos, count); |
| 512 | else |
| 513 | pr_debug("read_rbu_data: invalid image type specified\n"); |
| 514 | |
| 515 | spin_unlock(&rbu_data.lock); |
| 516 | return ret_count; |
| 517 | } |
| 518 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 519 | static void callbackfn_rbu(const struct firmware *fw, void *context) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 520 | { |
| 521 | int rc = 0; |
| 522 | |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 523 | if (!fw || !fw->size) { |
| 524 | rbu_data.entry_created = 0; |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 525 | return; |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 526 | } |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 527 | |
| 528 | spin_lock(&rbu_data.lock); |
| 529 | if (!strcmp(image_type, "mono")) { |
| 530 | if (!img_update_realloc(fw->size)) |
| 531 | memcpy(rbu_data.image_update_buffer, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 532 | fw->data, fw->size); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 533 | } else if (!strcmp(image_type, "packet")) { |
| 534 | if (!rbu_data.packetsize) |
| 535 | rbu_data.packetsize = fw->size; |
| 536 | else if (rbu_data.packetsize != fw->size) { |
| 537 | packet_empty_list(); |
| 538 | rbu_data.packetsize = fw->size; |
| 539 | } |
| 540 | packetize_data(fw->data, fw->size); |
| 541 | } else |
| 542 | pr_debug("invalid image type specified.\n"); |
| 543 | spin_unlock(&rbu_data.lock); |
| 544 | |
| 545 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 546 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 547 | if (rc) |
| 548 | printk(KERN_ERR |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 549 | "dell_rbu:%s request_firmware_nowait failed" |
| 550 | " %d\n", __FUNCTION__, rc); |
| 551 | else |
| 552 | rbu_data.entry_created = 1; |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 553 | } |
| 554 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 555 | static ssize_t read_rbu_image_type(struct kobject *kobj, char *buffer, |
| 556 | loff_t pos, size_t count) |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 557 | { |
| 558 | int size = 0; |
| 559 | if (!pos) |
| 560 | size = sprintf(buffer, "%s\n", image_type); |
| 561 | return size; |
| 562 | } |
| 563 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 564 | static ssize_t write_rbu_image_type(struct kobject *kobj, char *buffer, |
| 565 | loff_t pos, size_t count) |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 566 | { |
| 567 | int rc = count; |
| 568 | int req_firm_rc = 0; |
| 569 | int i; |
| 570 | spin_lock(&rbu_data.lock); |
| 571 | /* |
| 572 | * Find the first newline or space |
| 573 | */ |
| 574 | for (i = 0; i < count; ++i) |
| 575 | if (buffer[i] == '\n' || buffer[i] == ' ') { |
| 576 | buffer[i] = '\0'; |
| 577 | break; |
| 578 | } |
| 579 | if (i == count) |
| 580 | buffer[count] = '\0'; |
| 581 | |
| 582 | if (strstr(buffer, "mono")) |
| 583 | strcpy(image_type, "mono"); |
| 584 | else if (strstr(buffer, "packet")) |
| 585 | strcpy(image_type, "packet"); |
| 586 | else if (strstr(buffer, "init")) { |
| 587 | /* |
| 588 | * If due to the user error the driver gets in a bad |
| 589 | * state where even though it is loaded , the |
| 590 | * /sys/class/firmware/dell_rbu entries are missing. |
| 591 | * to cover this situation the user can recreate entries |
| 592 | * by writing init to image_type. |
| 593 | */ |
| 594 | if (!rbu_data.entry_created) { |
| 595 | spin_unlock(&rbu_data.lock); |
| 596 | req_firm_rc = request_firmware_nowait(THIS_MODULE, |
| 597 | FW_ACTION_NOHOTPLUG, "dell_rbu", |
| 598 | &rbu_device->dev, &context, |
| 599 | callbackfn_rbu); |
| 600 | if (req_firm_rc) { |
| 601 | printk(KERN_ERR |
| 602 | "dell_rbu:%s request_firmware_nowait" |
| 603 | " failed %d\n", __FUNCTION__, rc); |
| 604 | rc = -EIO; |
| 605 | } else |
| 606 | rbu_data.entry_created = 1; |
| 607 | |
| 608 | spin_lock(&rbu_data.lock); |
| 609 | } |
| 610 | } else { |
| 611 | printk(KERN_WARNING "dell_rbu: image_type is invalid\n"); |
| 612 | spin_unlock(&rbu_data.lock); |
| 613 | return -EINVAL; |
| 614 | } |
| 615 | |
| 616 | /* we must free all previous allocations */ |
| 617 | packet_empty_list(); |
| 618 | img_update_free(); |
| 619 | spin_unlock(&rbu_data.lock); |
| 620 | |
| 621 | return rc; |
| 622 | } |
| 623 | |
| 624 | static struct bin_attribute rbu_data_attr = { |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 625 | .attr = { |
| 626 | .name = "data", |
| 627 | .owner = THIS_MODULE, |
| 628 | .mode = 0444, |
| 629 | }, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 630 | .read = read_rbu_data, |
| 631 | }; |
| 632 | |
| 633 | static struct bin_attribute rbu_image_type_attr = { |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 634 | .attr = { |
| 635 | .name = "image_type", |
| 636 | .owner = THIS_MODULE, |
| 637 | .mode = 0644, |
| 638 | }, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 639 | .read = read_rbu_image_type, |
| 640 | .write = write_rbu_image_type, |
| 641 | }; |
| 642 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 643 | static int __init dcdrbu_init(void) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 644 | { |
| 645 | int rc = 0; |
| 646 | spin_lock_init(&rbu_data.lock); |
| 647 | |
| 648 | init_packet_head(); |
| 649 | rbu_device = |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 650 | platform_device_register_simple("dell_rbu", -1, NULL, 0); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 651 | if (!rbu_device) { |
| 652 | printk(KERN_ERR |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 653 | "dell_rbu:%s:platform_device_register_simple " |
| 654 | "failed\n", __FUNCTION__); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 655 | return -EIO; |
| 656 | } |
| 657 | |
| 658 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr); |
| 659 | sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr); |
| 660 | |
| 661 | rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG, |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 662 | "dell_rbu", &rbu_device->dev, &context, callbackfn_rbu); |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 663 | if (rc) |
| 664 | printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait" |
Abhay Salunke | e61c0e3 | 2005-09-16 19:28:04 -0700 | [diff] [blame] | 665 | " failed %d\n", __FUNCTION__, rc); |
| 666 | else |
| 667 | rbu_data.entry_created = 1; |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 668 | |
| 669 | return rc; |
| 670 | |
| 671 | } |
| 672 | |
Andrew Morton | dda8577 | 2005-09-16 19:28:05 -0700 | [diff] [blame] | 673 | static __exit void dcdrbu_exit(void) |
Abhay Salunke | 6c54c28 | 2005-09-06 15:17:14 -0700 | [diff] [blame] | 674 | { |
| 675 | spin_lock(&rbu_data.lock); |
| 676 | packet_empty_list(); |
| 677 | img_update_free(); |
| 678 | spin_unlock(&rbu_data.lock); |
| 679 | platform_device_unregister(rbu_device); |
| 680 | } |
| 681 | |
| 682 | module_exit(dcdrbu_exit); |
| 683 | module_init(dcdrbu_init); |