Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 562 insertions, 0 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
new file mode 100644
index 00000000000..510ad78312c
--- /dev/null
+++ b/drivers/mtd/mtdchar.c
@@ -0,0 +1,562 @@
+/*
+ * $Id: mtdchar.c,v 1.66 2005/01/05 18:05:11 dwmw2 Exp $
+ *
+ * Character-device access to raw MTD devices.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/compatmac.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_DEVFS_FS
+#include <linux/devfs_fs_kernel.h>
+
+static void mtd_notify_add(struct mtd_info* mtd)
+{
+	if (!mtd)
+		return;
+
+	devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
+		      S_IFCHR | S_IRUGO | S_IWUGO, "mtd/%d", mtd->index);
+		
+	devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
+		      S_IFCHR | S_IRUGO, "mtd/%dro", mtd->index);
+}
+
+static void mtd_notify_remove(struct mtd_info* mtd)
+{
+	if (!mtd)
+		return;
+	devfs_remove("mtd/%d", mtd->index);
+	devfs_remove("mtd/%dro", mtd->index);
+}
+
+static struct mtd_notifier notifier = {
+	.add	= mtd_notify_add,
+	.remove	= mtd_notify_remove,
+};
+
+static inline void mtdchar_devfs_init(void)
+{
+	devfs_mk_dir("mtd");
+	register_mtd_user(&notifier);
+}
+
+static inline void mtdchar_devfs_exit(void)
+{
+	unregister_mtd_user(&notifier);
+	devfs_remove("mtd");
+}
+#else /* !DEVFS */
+#define mtdchar_devfs_init() do { } while(0)
+#define mtdchar_devfs_exit() do { } while(0)
+#endif
+
+static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
+{
+	struct mtd_info *mtd = file->private_data;
+
+	switch (orig) {
+	case 0:
+		/* SEEK_SET */
+		file->f_pos = offset;
+		break;
+	case 1:
+		/* SEEK_CUR */
+		file->f_pos += offset;
+		break;
+	case 2:
+		/* SEEK_END */
+		file->f_pos =mtd->size + offset;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (file->f_pos < 0)
+		file->f_pos = 0;
+	else if (file->f_pos >= mtd->size)
+		file->f_pos = mtd->size - 1;
+
+	return file->f_pos;
+}
+
+
+
+static int mtd_open(struct inode *inode, struct file *file)
+{
+	int minor = iminor(inode);
+	int devnum = minor >> 1;
+	struct mtd_info *mtd;
+
+	DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
+
+	if (devnum >= MAX_MTD_DEVICES)
+		return -ENODEV;
+
+	/* You can't open the RO devices RW */
+	if ((file->f_mode & 2) && (minor & 1))
+		return -EACCES;
+
+	mtd = get_mtd_device(NULL, devnum);
+	
+	if (!mtd)
+		return -ENODEV;
+	
+	if (MTD_ABSENT == mtd->type) {
+		put_mtd_device(mtd);
+		return -ENODEV;
+	}
+
+	file->private_data = mtd;
+		
+	/* You can't open it RW if it's not a writeable device */
+	if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
+		put_mtd_device(mtd);
+		return -EACCES;
+	}
+		
+	return 0;
+} /* mtd_open */
+
+/*====================================================================*/
+
+static int mtd_close(struct inode *inode, struct file *file)
+{
+	struct mtd_info *mtd;
+
+	DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
+
+	mtd = file->private_data;
+	
+	if (mtd->sync)
+		mtd->sync(mtd);
+	
+	put_mtd_device(mtd);
+
+	return 0;
+} /* mtd_close */
+
+/* FIXME: This _really_ needs to die. In 2.5, we should lock the
+   userspace buffer down and use it directly with readv/writev.
+*/
+#define MAX_KMALLOC_SIZE 0x20000
+
+static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
+{
+	struct mtd_info *mtd = file->private_data;
+	size_t retlen=0;
+	size_t total_retlen=0;
+	int ret=0;
+	int len;
+	char *kbuf;
+	
+	DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
+
+	if (*ppos + count > mtd->size)
+		count = mtd->size - *ppos;
+
+	if (!count)
+		return 0;
+	
+	/* FIXME: Use kiovec in 2.5 to lock down the user's buffers
+	   and pass them directly to the MTD functions */
+	while (count) {
+		if (count > MAX_KMALLOC_SIZE) 
+			len = MAX_KMALLOC_SIZE;
+		else
+			len = count;
+
+		kbuf=kmalloc(len,GFP_KERNEL);
+		if (!kbuf)
+			return -ENOMEM;
+		
+		ret = MTD_READ(mtd, *ppos, len, &retlen, kbuf);
+		/* Nand returns -EBADMSG on ecc errors, but it returns
+		 * the data. For our userspace tools it is important
+		 * to dump areas with ecc errors ! 
+		 * Userspace software which accesses NAND this way
+		 * must be aware of the fact that it deals with NAND
+		 */
+		if (!ret || (ret == -EBADMSG)) {
+			*ppos += retlen;
+			if (copy_to_user(buf, kbuf, retlen)) {
+			        kfree(kbuf);
+				return -EFAULT;
+			}
+			else
+				total_retlen += retlen;
+
+			count -= retlen;
+			buf += retlen;
+		}
+		else {
+			kfree(kbuf);
+			return ret;
+		}
+		
+		kfree(kbuf);
+	}
+
+	return total_retlen;
+} /* mtd_read */
+
+static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
+{
+	struct mtd_info *mtd = file->private_data;
+	char *kbuf;
+	size_t retlen;
+	size_t total_retlen=0;
+	int ret=0;
+	int len;
+
+	DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
+	
+	if (*ppos == mtd->size)
+		return -ENOSPC;
+	
+	if (*ppos + count > mtd->size)
+		count = mtd->size - *ppos;
+
+	if (!count)
+		return 0;
+
+	while (count) {
+		if (count > MAX_KMALLOC_SIZE) 
+			len = MAX_KMALLOC_SIZE;
+		else
+			len = count;
+
+		kbuf=kmalloc(len,GFP_KERNEL);
+		if (!kbuf) {
+			printk("kmalloc is null\n");
+			return -ENOMEM;
+		}
+
+		if (copy_from_user(kbuf, buf, len)) {
+			kfree(kbuf);
+			return -EFAULT;
+		}
+		
+	        ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
+		if (!ret) {
+			*ppos += retlen;
+			total_retlen += retlen;
+			count -= retlen;
+			buf += retlen;
+		}
+		else {
+			kfree(kbuf);
+			return ret;
+		}
+		
+		kfree(kbuf);
+	}
+
+	return total_retlen;
+} /* mtd_write */
+
+/*======================================================================
+
+    IOCTL calls for getting device parameters.
+
+======================================================================*/
+static void mtdchar_erase_callback (struct erase_info *instr)
+{
+	wake_up((wait_queue_head_t *)instr->priv);
+}
+
+static int mtd_ioctl(struct inode *inode, struct file *file,
+		     u_int cmd, u_long arg)
+{
+	struct mtd_info *mtd = file->private_data;
+	void __user *argp = (void __user *)arg;
+	int ret = 0;
+	u_long size;
+	
+	DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
+
+	size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
+	if (cmd & IOC_IN) {
+		if (!access_ok(VERIFY_READ, argp, size))
+			return -EFAULT;
+	}
+	if (cmd & IOC_OUT) {
+		if (!access_ok(VERIFY_WRITE, argp, size))
+			return -EFAULT;
+	}
+	
+	switch (cmd) {
+	case MEMGETREGIONCOUNT:
+		if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
+			return -EFAULT;
+		break;
+
+	case MEMGETREGIONINFO:
+	{
+		struct region_info_user ur;
+
+		if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
+			return -EFAULT;
+
+		if (ur.regionindex >= mtd->numeraseregions)
+			return -EINVAL;
+		if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
+				sizeof(struct mtd_erase_region_info)))
+			return -EFAULT;
+		break;
+	}
+
+	case MEMGETINFO:
+		if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user)))
+			return -EFAULT;
+		break;
+
+	case MEMERASE:
+	{
+		struct erase_info *erase;
+
+		if(!(file->f_mode & 2))
+			return -EPERM;
+
+		erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL);
+		if (!erase)
+			ret = -ENOMEM;
+		else {
+			wait_queue_head_t waitq;
+			DECLARE_WAITQUEUE(wait, current);
+
+			init_waitqueue_head(&waitq);
+
+			memset (erase,0,sizeof(struct erase_info));
+			if (copy_from_user(&erase->addr, argp,
+				    sizeof(struct erase_info_user))) {
+				kfree(erase);
+				return -EFAULT;
+			}
+			erase->mtd = mtd;
+			erase->callback = mtdchar_erase_callback;
+			erase->priv = (unsigned long)&waitq;
+			
+			/*
+			  FIXME: Allow INTERRUPTIBLE. Which means
+			  not having the wait_queue head on the stack.
+			  
+			  If the wq_head is on the stack, and we
+			  leave because we got interrupted, then the
+			  wq_head is no longer there when the
+			  callback routine tries to wake us up.
+			*/
+			ret = mtd->erase(mtd, erase);
+			if (!ret) {
+				set_current_state(TASK_UNINTERRUPTIBLE);
+				add_wait_queue(&waitq, &wait);
+				if (erase->state != MTD_ERASE_DONE &&
+				    erase->state != MTD_ERASE_FAILED)
+					schedule();
+				remove_wait_queue(&waitq, &wait);
+				set_current_state(TASK_RUNNING);
+
+				ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
+			}
+			kfree(erase);
+		}
+		break;
+	}
+
+	case MEMWRITEOOB:
+	{
+		struct mtd_oob_buf buf;
+		void *databuf;
+		ssize_t retlen;
+		
+		if(!(file->f_mode & 2))
+			return -EPERM;
+
+		if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
+			return -EFAULT;
+		
+		if (buf.length > 0x4096)
+			return -EINVAL;
+
+		if (!mtd->write_oob)
+			ret = -EOPNOTSUPP;
+		else
+			ret = access_ok(VERIFY_READ, buf.ptr,
+					buf.length) ? 0 : EFAULT;
+
+		if (ret)
+			return ret;
+
+		databuf = kmalloc(buf.length, GFP_KERNEL);
+		if (!databuf)
+			return -ENOMEM;
+		
+		if (copy_from_user(databuf, buf.ptr, buf.length)) {
+			kfree(databuf);
+			return -EFAULT;
+		}
+
+		ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf);
+
+		if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t)))
+			ret = -EFAULT;
+
+		kfree(databuf);
+		break;
+
+	}
+
+	case MEMREADOOB:
+	{
+		struct mtd_oob_buf buf;
+		void *databuf;
+		ssize_t retlen;
+
+		if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
+			return -EFAULT;
+		
+		if (buf.length > 0x4096)
+			return -EINVAL;
+
+		if (!mtd->read_oob)
+			ret = -EOPNOTSUPP;
+		else
+			ret = access_ok(VERIFY_WRITE, buf.ptr,
+					buf.length) ? 0 : -EFAULT;
+
+		if (ret)
+			return ret;
+
+		databuf = kmalloc(buf.length, GFP_KERNEL);
+		if (!databuf)
+			return -ENOMEM;
+		
+		ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf);
+
+		if (put_user(retlen, (uint32_t __user *)argp))
+			ret = -EFAULT;
+		else if (retlen && copy_to_user(buf.ptr, databuf, retlen))
+			ret = -EFAULT;
+		
+		kfree(databuf);
+		break;
+	}
+
+	case MEMLOCK:
+	{
+		struct erase_info_user info;
+
+		if (copy_from_user(&info, argp, sizeof(info)))
+			return -EFAULT;
+
+		if (!mtd->lock)
+			ret = -EOPNOTSUPP;
+		else
+			ret = mtd->lock(mtd, info.start, info.length);
+		break;
+	}
+
+	case MEMUNLOCK:
+	{
+		struct erase_info_user info;
+
+		if (copy_from_user(&info, argp, sizeof(info)))
+			return -EFAULT;
+
+		if (!mtd->unlock)
+			ret = -EOPNOTSUPP;
+		else
+			ret = mtd->unlock(mtd, info.start, info.length);
+		break;
+	}
+
+	case MEMSETOOBSEL:
+	{
+		if (copy_from_user(&mtd->oobinfo, argp, sizeof(struct nand_oobinfo)))
+			return -EFAULT;
+		break;
+	}
+
+	case MEMGETOOBSEL:
+	{
+		if (copy_to_user(argp, &(mtd->oobinfo), sizeof(struct nand_oobinfo)))
+			return -EFAULT;
+		break;
+	}
+
+	case MEMGETBADBLOCK:
+	{
+		loff_t offs;
+		
+		if (copy_from_user(&offs, argp, sizeof(loff_t)))
+			return -EFAULT;
+		if (!mtd->block_isbad)
+			ret = -EOPNOTSUPP;
+		else
+			return mtd->block_isbad(mtd, offs);
+		break;
+	}
+
+	case MEMSETBADBLOCK:
+	{
+		loff_t offs;
+
+		if (copy_from_user(&offs, argp, sizeof(loff_t)))
+			return -EFAULT;
+		if (!mtd->block_markbad)
+			ret = -EOPNOTSUPP;
+		else
+			return mtd->block_markbad(mtd, offs);
+		break;
+	}
+
+	default:
+		ret = -ENOTTY;
+	}
+
+	return ret;
+} /* memory_ioctl */
+
+static struct file_operations mtd_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= mtd_lseek,
+	.read		= mtd_read,
+	.write		= mtd_write,
+	.ioctl		= mtd_ioctl,
+	.open		= mtd_open,
+	.release	= mtd_close,
+};
+
+static int __init init_mtdchar(void)
+{
+	if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
+		printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
+		       MTD_CHAR_MAJOR);
+		return -EAGAIN;
+	}
+
+	mtdchar_devfs_init();
+	return 0;
+}
+
+static void __exit cleanup_mtdchar(void)
+{
+	mtdchar_devfs_exit();
+	unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
+}
+
+module_init(init_mtdchar);
+module_exit(cleanup_mtdchar);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Direct character-device access to MTD devices");