2  * block2mtd.c - create an mtd from a block device
28 #include <linux/mtd/mtd.h>
41 	struct mtd_info mtd;  member
46 /* Static info about the MTD, used in cleanup_module */
87 static int block2mtd_erase(struct mtd_info *mtd, struct erase_info *instr)  in block2mtd_erase()  argument
89 	struct block2mtd_dev *dev = mtd->priv;  in block2mtd_erase()
104 static int block2mtd_read(struct mtd_info *mtd, loff_t from, size_t len,  in block2mtd_read()  argument
107 	struct block2mtd_dev *dev = mtd->priv;  in block2mtd_read()
179 static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len,  in block2mtd_write()  argument
182 	struct block2mtd_dev *dev = mtd->priv;  in block2mtd_write()
195 static void block2mtd_sync(struct mtd_info *mtd)  in block2mtd_sync()  argument
197 	struct block2mtd_dev *dev = mtd->priv;  in block2mtd_sync()
208 	kfree(dev->mtd.name);  in block2mtd_free_device()
291 		pr_err("attempting to use an MTD device as a block device\n");  in add_device()
303 	/* Setup the MTD structure */  in add_device()
312 	dev->mtd.name = name;  in add_device()
314 	dev->mtd.size = size & PAGE_MASK;  in add_device()
315 	dev->mtd.erasesize = erase_size;  in add_device()
316 	dev->mtd.writesize = 1;  in add_device()
317 	dev->mtd.writebufsize = PAGE_SIZE;  in add_device()
318 	dev->mtd.type = MTD_RAM;  in add_device()
319 	dev->mtd.flags = MTD_CAP_RAM;  in add_device()
320 	dev->mtd._erase = block2mtd_erase;  in add_device()
321 	dev->mtd._write = block2mtd_write;  in add_device()
322 	dev->mtd._sync = block2mtd_sync;  in add_device()
323 	dev->mtd._read = block2mtd_read;  in add_device()
324 	dev->mtd.priv = dev;  in add_device()
325 	dev->mtd.owner = THIS_MODULE;  in add_device()
327 	if (mtd_device_register(&dev->mtd, NULL, 0)) {  in add_device()
333 	pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n",  in add_device()
334 		dev->mtd.index,  in add_device()
335 		label ? label : dev->mtd.name + strlen("block2mtd: "),  in add_device()
336 		dev->mtd.erasesize >> 10, dev->mtd.erasesize);  in add_device()
456 		pr_info("Using custom MTD label '%s' for dev %s\n", label, name);  in block2mtd_setup2()
513 	/* Remove the MTD devices */  in block2mtd_exit()
516 		block2mtd_sync(&dev->mtd);  in block2mtd_exit()
517 		mtd_device_unregister(&dev->mtd);  in block2mtd_exit()
519 		pr_info("mtd%d: [%s] removed\n",  in block2mtd_exit()
520 			dev->mtd.index,  in block2mtd_exit()
521 			dev->mtd.name + strlen("block2mtd: "));  in block2mtd_exit()
532 MODULE_DESCRIPTION("Emulate an MTD using a block device");