Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2011 Tilera Corporation. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * SPI Flash ROM driver |
| 15 | * |
| 16 | * This source code is derived from code provided in "Linux Device |
| 17 | * Drivers, Third Edition", by Jonathan Corbet, Alessandro Rubini, and |
| 18 | * Greg Kroah-Hartman, published by O'Reilly Media, Inc. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/moduleparam.h> |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 23 | #include <linux/kernel.h> /* printk() */ |
| 24 | #include <linux/slab.h> /* kmalloc() */ |
| 25 | #include <linux/fs.h> /* everything... */ |
| 26 | #include <linux/errno.h> /* error codes */ |
| 27 | #include <linux/types.h> /* size_t */ |
| 28 | #include <linux/proc_fs.h> |
| 29 | #include <linux/fcntl.h> /* O_ACCMODE */ |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 30 | #include <linux/pagemap.h> |
| 31 | #include <linux/hugetlb.h> |
| 32 | #include <linux/uaccess.h> |
| 33 | #include <linux/platform_device.h> |
| 34 | #include <hv/hypervisor.h> |
| 35 | #include <linux/ioctl.h> |
| 36 | #include <linux/cdev.h> |
| 37 | #include <linux/delay.h> |
| 38 | #include <hv/drv_srom_intf.h> |
| 39 | |
| 40 | /* |
| 41 | * Size of our hypervisor I/O requests. We break up large transfers |
| 42 | * so that we don't spend large uninterrupted spans of time in the |
| 43 | * hypervisor. Erasing an SROM sector takes a significant fraction of |
| 44 | * a second, so if we allowed the user to, say, do one I/O to write the |
| 45 | * entire ROM, we'd get soft lockup timeouts, or worse. |
| 46 | */ |
| 47 | #define SROM_CHUNK_SIZE ((size_t)4096) |
| 48 | |
| 49 | /* |
| 50 | * When hypervisor is busy (e.g. erasing), poll the status periodically. |
| 51 | */ |
| 52 | |
| 53 | /* |
| 54 | * Interval to poll the state in msec |
| 55 | */ |
| 56 | #define SROM_WAIT_TRY_INTERVAL 20 |
| 57 | |
| 58 | /* |
| 59 | * Maximum times to poll the state |
| 60 | */ |
| 61 | #define SROM_MAX_WAIT_TRY_TIMES 1000 |
| 62 | |
| 63 | struct srom_dev { |
| 64 | int hv_devhdl; /* Handle for hypervisor device */ |
| 65 | u32 total_size; /* Size of this device */ |
| 66 | u32 sector_size; /* Size of a sector */ |
| 67 | u32 page_size; /* Size of a page */ |
| 68 | struct mutex lock; /* Allow only one accessor at a time */ |
| 69 | }; |
| 70 | |
| 71 | static int srom_major; /* Dynamic major by default */ |
| 72 | module_param(srom_major, int, 0); |
| 73 | MODULE_AUTHOR("Tilera Corporation"); |
| 74 | MODULE_LICENSE("GPL"); |
| 75 | |
| 76 | static int srom_devs; /* Number of SROM partitions */ |
| 77 | static struct cdev srom_cdev; |
Pawel Moll | 514b82a | 2014-08-08 16:32:58 +0100 | [diff] [blame] | 78 | static struct platform_device *srom_parent; |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 79 | static struct class *srom_class; |
| 80 | static struct srom_dev *srom_devices; |
| 81 | |
| 82 | /* |
| 83 | * Handle calling the hypervisor and managing EAGAIN/EBUSY. |
| 84 | */ |
| 85 | |
| 86 | static ssize_t _srom_read(int hv_devhdl, void *buf, |
| 87 | loff_t off, size_t count) |
| 88 | { |
| 89 | int retval, retries = SROM_MAX_WAIT_TRY_TIMES; |
| 90 | for (;;) { |
| 91 | retval = hv_dev_pread(hv_devhdl, 0, (HV_VirtAddr)buf, |
| 92 | count, off); |
| 93 | if (retval >= 0) |
| 94 | return retval; |
| 95 | if (retval == HV_EAGAIN) |
| 96 | continue; |
| 97 | if (retval == HV_EBUSY && --retries > 0) { |
| 98 | msleep(SROM_WAIT_TRY_INTERVAL); |
| 99 | continue; |
| 100 | } |
| 101 | pr_err("_srom_read: error %d\n", retval); |
| 102 | return -EIO; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | static ssize_t _srom_write(int hv_devhdl, const void *buf, |
| 107 | loff_t off, size_t count) |
| 108 | { |
| 109 | int retval, retries = SROM_MAX_WAIT_TRY_TIMES; |
| 110 | for (;;) { |
| 111 | retval = hv_dev_pwrite(hv_devhdl, 0, (HV_VirtAddr)buf, |
| 112 | count, off); |
| 113 | if (retval >= 0) |
| 114 | return retval; |
| 115 | if (retval == HV_EAGAIN) |
| 116 | continue; |
| 117 | if (retval == HV_EBUSY && --retries > 0) { |
| 118 | msleep(SROM_WAIT_TRY_INTERVAL); |
| 119 | continue; |
| 120 | } |
| 121 | pr_err("_srom_write: error %d\n", retval); |
| 122 | return -EIO; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * srom_open() - Device open routine. |
| 128 | * @inode: Inode for this device. |
| 129 | * @filp: File for this specific open of the device. |
| 130 | * |
| 131 | * Returns zero, or an error code. |
| 132 | */ |
| 133 | static int srom_open(struct inode *inode, struct file *filp) |
| 134 | { |
| 135 | filp->private_data = &srom_devices[iminor(inode)]; |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | |
| 140 | /** |
| 141 | * srom_release() - Device release routine. |
| 142 | * @inode: Inode for this device. |
| 143 | * @filp: File for this specific open of the device. |
| 144 | * |
| 145 | * Returns zero, or an error code. |
| 146 | */ |
| 147 | static int srom_release(struct inode *inode, struct file *filp) |
| 148 | { |
| 149 | struct srom_dev *srom = filp->private_data; |
| 150 | char dummy; |
| 151 | |
| 152 | /* Make sure we've flushed anything written to the ROM. */ |
| 153 | mutex_lock(&srom->lock); |
| 154 | if (srom->hv_devhdl >= 0) |
| 155 | _srom_write(srom->hv_devhdl, &dummy, SROM_FLUSH_OFF, 1); |
| 156 | mutex_unlock(&srom->lock); |
| 157 | |
| 158 | filp->private_data = NULL; |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | |
| 164 | /** |
| 165 | * srom_read() - Read data from the device. |
| 166 | * @filp: File for this specific open of the device. |
| 167 | * @buf: User's data buffer. |
| 168 | * @count: Number of bytes requested. |
| 169 | * @f_pos: File position. |
| 170 | * |
| 171 | * Returns number of bytes read, or an error code. |
| 172 | */ |
| 173 | static ssize_t srom_read(struct file *filp, char __user *buf, |
| 174 | size_t count, loff_t *f_pos) |
| 175 | { |
| 176 | int retval = 0; |
| 177 | void *kernbuf; |
| 178 | struct srom_dev *srom = filp->private_data; |
| 179 | |
| 180 | kernbuf = kmalloc(SROM_CHUNK_SIZE, GFP_KERNEL); |
| 181 | if (!kernbuf) |
| 182 | return -ENOMEM; |
| 183 | |
| 184 | if (mutex_lock_interruptible(&srom->lock)) { |
| 185 | retval = -ERESTARTSYS; |
| 186 | kfree(kernbuf); |
| 187 | return retval; |
| 188 | } |
| 189 | |
| 190 | while (count) { |
| 191 | int hv_retval; |
| 192 | int bytes_this_pass = min(count, SROM_CHUNK_SIZE); |
| 193 | |
| 194 | hv_retval = _srom_read(srom->hv_devhdl, kernbuf, |
| 195 | *f_pos, bytes_this_pass); |
Chris Metcalf | 16418bb | 2012-03-30 19:03:04 -0400 | [diff] [blame] | 196 | if (hv_retval <= 0) { |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 197 | if (retval == 0) |
| 198 | retval = hv_retval; |
| 199 | break; |
| 200 | } |
| 201 | |
Chris Metcalf | 16418bb | 2012-03-30 19:03:04 -0400 | [diff] [blame] | 202 | if (copy_to_user(buf, kernbuf, hv_retval) != 0) { |
| 203 | retval = -EFAULT; |
| 204 | break; |
| 205 | } |
| 206 | |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 207 | retval += hv_retval; |
| 208 | *f_pos += hv_retval; |
| 209 | buf += hv_retval; |
| 210 | count -= hv_retval; |
| 211 | } |
| 212 | |
| 213 | mutex_unlock(&srom->lock); |
| 214 | kfree(kernbuf); |
| 215 | |
| 216 | return retval; |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * srom_write() - Write data to the device. |
| 221 | * @filp: File for this specific open of the device. |
| 222 | * @buf: User's data buffer. |
| 223 | * @count: Number of bytes requested. |
| 224 | * @f_pos: File position. |
| 225 | * |
| 226 | * Returns number of bytes written, or an error code. |
| 227 | */ |
| 228 | static ssize_t srom_write(struct file *filp, const char __user *buf, |
| 229 | size_t count, loff_t *f_pos) |
| 230 | { |
| 231 | int retval = 0; |
| 232 | void *kernbuf; |
| 233 | struct srom_dev *srom = filp->private_data; |
| 234 | |
| 235 | kernbuf = kmalloc(SROM_CHUNK_SIZE, GFP_KERNEL); |
| 236 | if (!kernbuf) |
| 237 | return -ENOMEM; |
| 238 | |
| 239 | if (mutex_lock_interruptible(&srom->lock)) { |
| 240 | retval = -ERESTARTSYS; |
| 241 | kfree(kernbuf); |
| 242 | return retval; |
| 243 | } |
| 244 | |
| 245 | while (count) { |
| 246 | int hv_retval; |
| 247 | int bytes_this_pass = min(count, SROM_CHUNK_SIZE); |
| 248 | |
| 249 | if (copy_from_user(kernbuf, buf, bytes_this_pass) != 0) { |
| 250 | retval = -EFAULT; |
| 251 | break; |
| 252 | } |
| 253 | |
| 254 | hv_retval = _srom_write(srom->hv_devhdl, kernbuf, |
| 255 | *f_pos, bytes_this_pass); |
| 256 | if (hv_retval <= 0) { |
| 257 | if (retval == 0) |
| 258 | retval = hv_retval; |
| 259 | break; |
| 260 | } |
| 261 | |
| 262 | retval += hv_retval; |
| 263 | *f_pos += hv_retval; |
| 264 | buf += hv_retval; |
| 265 | count -= hv_retval; |
| 266 | } |
| 267 | |
| 268 | mutex_unlock(&srom->lock); |
| 269 | kfree(kernbuf); |
| 270 | |
| 271 | return retval; |
| 272 | } |
| 273 | |
| 274 | /* Provide our own implementation so we can use srom->total_size. */ |
Al Viro | 914961a | 2013-06-23 12:43:48 +0400 | [diff] [blame] | 275 | loff_t srom_llseek(struct file *file, loff_t offset, int origin) |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 276 | { |
Al Viro | 914961a | 2013-06-23 12:43:48 +0400 | [diff] [blame] | 277 | struct srom_dev *srom = file->private_data; |
| 278 | return fixed_size_llseek(file, offset, origin, srom->total_size); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 279 | } |
| 280 | |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 281 | static ssize_t total_size_show(struct device *dev, |
| 282 | struct device_attribute *attr, char *buf) |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 283 | { |
| 284 | struct srom_dev *srom = dev_get_drvdata(dev); |
| 285 | return sprintf(buf, "%u\n", srom->total_size); |
| 286 | } |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 287 | static DEVICE_ATTR_RO(total_size); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 288 | |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 289 | static ssize_t sector_size_show(struct device *dev, |
| 290 | struct device_attribute *attr, char *buf) |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 291 | { |
| 292 | struct srom_dev *srom = dev_get_drvdata(dev); |
| 293 | return sprintf(buf, "%u\n", srom->sector_size); |
| 294 | } |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 295 | static DEVICE_ATTR_RO(sector_size); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 296 | |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 297 | static ssize_t page_size_show(struct device *dev, |
| 298 | struct device_attribute *attr, char *buf) |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 299 | { |
| 300 | struct srom_dev *srom = dev_get_drvdata(dev); |
| 301 | return sprintf(buf, "%u\n", srom->page_size); |
| 302 | } |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 303 | static DEVICE_ATTR_RO(page_size); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 304 | |
Greg Kroah-Hartman | 7c42721 | 2013-07-25 13:50:30 -0700 | [diff] [blame] | 305 | static struct attribute *srom_dev_attrs[] = { |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 306 | &dev_attr_total_size.attr, |
| 307 | &dev_attr_sector_size.attr, |
| 308 | &dev_attr_page_size.attr, |
| 309 | NULL, |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 310 | }; |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 311 | ATTRIBUTE_GROUPS(srom_dev); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 312 | |
Al Viro | 2c9ede5 | 2011-07-23 20:24:48 -0400 | [diff] [blame] | 313 | static char *srom_devnode(struct device *dev, umode_t *mode) |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 314 | { |
| 315 | *mode = S_IRUGO | S_IWUSR; |
| 316 | return kasprintf(GFP_KERNEL, "srom/%s", dev_name(dev)); |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * The fops |
| 321 | */ |
| 322 | static const struct file_operations srom_fops = { |
| 323 | .owner = THIS_MODULE, |
| 324 | .llseek = srom_llseek, |
| 325 | .read = srom_read, |
| 326 | .write = srom_write, |
| 327 | .open = srom_open, |
| 328 | .release = srom_release, |
| 329 | }; |
| 330 | |
| 331 | /** |
| 332 | * srom_setup_minor() - Initialize per-minor information. |
| 333 | * @srom: Per-device SROM state. |
| 334 | * @index: Device to set up. |
| 335 | */ |
| 336 | static int srom_setup_minor(struct srom_dev *srom, int index) |
| 337 | { |
| 338 | struct device *dev; |
| 339 | int devhdl = srom->hv_devhdl; |
| 340 | |
| 341 | mutex_init(&srom->lock); |
| 342 | |
| 343 | if (_srom_read(devhdl, &srom->total_size, |
| 344 | SROM_TOTAL_SIZE_OFF, sizeof(srom->total_size)) < 0) |
| 345 | return -EIO; |
| 346 | if (_srom_read(devhdl, &srom->sector_size, |
| 347 | SROM_SECTOR_SIZE_OFF, sizeof(srom->sector_size)) < 0) |
| 348 | return -EIO; |
| 349 | if (_srom_read(devhdl, &srom->page_size, |
| 350 | SROM_PAGE_SIZE_OFF, sizeof(srom->page_size)) < 0) |
| 351 | return -EIO; |
| 352 | |
Pawel Moll | 514b82a | 2014-08-08 16:32:58 +0100 | [diff] [blame] | 353 | dev = device_create(srom_class, &srom_parent->dev, |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 354 | MKDEV(srom_major, index), srom, "%d", index); |
Rusty Russell | 8c6ffba | 2013-07-15 11:20:32 +0930 | [diff] [blame] | 355 | return PTR_ERR_OR_ZERO(dev); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /** srom_init() - Initialize the driver's module. */ |
| 359 | static int srom_init(void) |
| 360 | { |
| 361 | int result, i; |
| 362 | dev_t dev = MKDEV(srom_major, 0); |
| 363 | |
| 364 | /* |
| 365 | * Start with a plausible number of partitions; the krealloc() call |
| 366 | * below will yield about log(srom_devs) additional allocations. |
| 367 | */ |
| 368 | srom_devices = kzalloc(4 * sizeof(struct srom_dev), GFP_KERNEL); |
| 369 | |
| 370 | /* Discover the number of srom partitions. */ |
| 371 | for (i = 0; ; i++) { |
| 372 | int devhdl; |
| 373 | char buf[20]; |
| 374 | struct srom_dev *new_srom_devices = |
| 375 | krealloc(srom_devices, (i+1) * sizeof(struct srom_dev), |
| 376 | GFP_KERNEL | __GFP_ZERO); |
| 377 | if (!new_srom_devices) { |
| 378 | result = -ENOMEM; |
| 379 | goto fail_mem; |
| 380 | } |
| 381 | srom_devices = new_srom_devices; |
| 382 | sprintf(buf, "srom/0/%d", i); |
| 383 | devhdl = hv_dev_open((HV_VirtAddr)buf, 0); |
| 384 | if (devhdl < 0) { |
| 385 | if (devhdl != HV_ENODEV) |
| 386 | pr_notice("srom/%d: hv_dev_open failed: %d.\n", |
| 387 | i, devhdl); |
| 388 | break; |
| 389 | } |
| 390 | srom_devices[i].hv_devhdl = devhdl; |
| 391 | } |
| 392 | srom_devs = i; |
| 393 | |
| 394 | /* Bail out early if we have no partitions at all. */ |
| 395 | if (srom_devs == 0) { |
| 396 | result = -ENODEV; |
| 397 | goto fail_mem; |
| 398 | } |
| 399 | |
| 400 | /* Register our major, and accept a dynamic number. */ |
| 401 | if (srom_major) |
| 402 | result = register_chrdev_region(dev, srom_devs, "srom"); |
| 403 | else { |
| 404 | result = alloc_chrdev_region(&dev, 0, srom_devs, "srom"); |
| 405 | srom_major = MAJOR(dev); |
| 406 | } |
| 407 | if (result < 0) |
| 408 | goto fail_mem; |
| 409 | |
| 410 | /* Register a character device. */ |
| 411 | cdev_init(&srom_cdev, &srom_fops); |
| 412 | srom_cdev.owner = THIS_MODULE; |
| 413 | srom_cdev.ops = &srom_fops; |
| 414 | result = cdev_add(&srom_cdev, dev, srom_devs); |
| 415 | if (result < 0) |
| 416 | goto fail_chrdev; |
| 417 | |
Pawel Moll | 514b82a | 2014-08-08 16:32:58 +0100 | [diff] [blame] | 418 | /* Create a parent device */ |
| 419 | srom_parent = platform_device_register_simple("srom", -1, NULL, 0); |
| 420 | if (IS_ERR(srom_parent)) { |
| 421 | result = PTR_ERR(srom_parent); |
| 422 | goto fail_pdev; |
| 423 | } |
| 424 | |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 425 | /* Create a sysfs class. */ |
| 426 | srom_class = class_create(THIS_MODULE, "srom"); |
| 427 | if (IS_ERR(srom_class)) { |
| 428 | result = PTR_ERR(srom_class); |
| 429 | goto fail_cdev; |
| 430 | } |
Greg Kroah-Hartman | e017a84 | 2013-07-24 15:05:07 -0700 | [diff] [blame] | 431 | srom_class->dev_groups = srom_dev_groups; |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 432 | srom_class->devnode = srom_devnode; |
| 433 | |
| 434 | /* Do per-partition initialization */ |
| 435 | for (i = 0; i < srom_devs; i++) { |
| 436 | result = srom_setup_minor(srom_devices + i, i); |
| 437 | if (result < 0) |
| 438 | goto fail_class; |
| 439 | } |
| 440 | |
| 441 | return 0; |
| 442 | |
| 443 | fail_class: |
| 444 | for (i = 0; i < srom_devs; i++) |
| 445 | device_destroy(srom_class, MKDEV(srom_major, i)); |
| 446 | class_destroy(srom_class); |
| 447 | fail_cdev: |
Pawel Moll | 514b82a | 2014-08-08 16:32:58 +0100 | [diff] [blame] | 448 | platform_device_unregister(srom_parent); |
| 449 | fail_pdev: |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 450 | cdev_del(&srom_cdev); |
| 451 | fail_chrdev: |
| 452 | unregister_chrdev_region(dev, srom_devs); |
| 453 | fail_mem: |
| 454 | kfree(srom_devices); |
| 455 | return result; |
| 456 | } |
| 457 | |
| 458 | /** srom_cleanup() - Clean up the driver's module. */ |
| 459 | static void srom_cleanup(void) |
| 460 | { |
| 461 | int i; |
| 462 | for (i = 0; i < srom_devs; i++) |
| 463 | device_destroy(srom_class, MKDEV(srom_major, i)); |
| 464 | class_destroy(srom_class); |
| 465 | cdev_del(&srom_cdev); |
Pawel Moll | 514b82a | 2014-08-08 16:32:58 +0100 | [diff] [blame] | 466 | platform_device_unregister(srom_parent); |
Chris Metcalf | dbcb4a1 | 2011-06-10 13:07:48 -0400 | [diff] [blame] | 467 | unregister_chrdev_region(MKDEV(srom_major, 0), srom_devs); |
| 468 | kfree(srom_devices); |
| 469 | } |
| 470 | |
| 471 | module_init(srom_init); |
| 472 | module_exit(srom_cleanup); |