*/
static void mtd_release(struct device *dev)
{
- struct mtd_info *mtd = dev_get_drvdata(dev);
+ struct mtd_info __maybe_unused *mtd = dev_get_drvdata(dev);
dev_t index = MTD_DEVT(mtd->index);
/* remove /dev/mtdXro node if needed */
{
struct mtd_info *mtd = dev_get_drvdata(dev);
- if (mtd && mtd->resume)
+ if (mtd)
mtd_resume(mtd);
return 0;
}
if (!try_module_get(mtd->owner))
return -ENODEV;
- if (mtd->get_device) {
- err = mtd->get_device(mtd);
+ if (mtd->_get_device) {
+ err = mtd->_get_device(mtd);
if (err) {
module_put(mtd->owner);
--mtd->usecount;
BUG_ON(mtd->usecount < 0);
- if (mtd->put_device)
- mtd->put_device(mtd);
+ if (mtd->_put_device)
+ mtd->_put_device(mtd);
module_put(mtd->owner);
}
EXPORT_SYMBOL_GPL(__put_mtd_device);
+/*
+ * Erase is an asynchronous operation. Device drivers are supposed
+ * to call instr->callback() whenever the operation completes, even
+ * if it completes with a failure.
+ * Callers are supposed to pass a callback function and wait for it
+ * to be called before writing to the block.
+ */
+int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ if (instr->addr > mtd->size || instr->len > mtd->size - instr->addr)
+ return -EINVAL;
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
+ if (!instr->len) {
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+ return 0;
+ }
+ return mtd->_erase(mtd, instr);
+}
+EXPORT_SYMBOL_GPL(mtd_erase);
+
+/*
+ * This stuff for eXecute-In-Place. phys is optional and may be set to NULL.
+ */
+int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
+ void **virt, resource_size_t *phys)
+{
+ *retlen = 0;
+ *virt = NULL;
+ if (phys)
+ *phys = 0;
+ if (!mtd->_point)
+ return -EOPNOTSUPP;
+ if (from < 0 || from > mtd->size || len > mtd->size - from)
+ return -EINVAL;
+ if (!len)
+ return 0;
+ return mtd->_point(mtd, from, len, retlen, virt, phys);
+}
+EXPORT_SYMBOL_GPL(mtd_point);
+
+/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
+int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
+{
+ if (!mtd->_point)
+ return -EOPNOTSUPP;
+ if (from < 0 || from > mtd->size || len > mtd->size - from)
+ return -EINVAL;
+ if (!len)
+ return 0;
+ return mtd->_unpoint(mtd, from, len);
+}
+EXPORT_SYMBOL_GPL(mtd_unpoint);
+
+/*
+ * Allow NOMMU mmap() to directly map the device (if not NULL)
+ * - return the address to which the offset maps
+ * - return -ENOSYS to indicate refusal to do the mapping
+ */
+unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
+ unsigned long offset, unsigned long flags)
+{
+ if (!mtd->_get_unmapped_area)
+ return -EOPNOTSUPP;
+ if (offset > mtd->size || len > mtd->size - offset)
+ return -EINVAL;
+ return mtd->_get_unmapped_area(mtd, len, offset, flags);
+}
+EXPORT_SYMBOL_GPL(mtd_get_unmapped_area);
+
+int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
+ u_char *buf)
+{
+ *retlen = 0;
+ if (from < 0 || from > mtd->size || len > mtd->size - from)
+ return -EINVAL;
+ if (!len)
+ return 0;
+ return mtd->_read(mtd, from, len, retlen, buf);
+}
+EXPORT_SYMBOL_GPL(mtd_read);
+
+int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
+ const u_char *buf)
+{
+ *retlen = 0;
+ if (to < 0 || to > mtd->size || len > mtd->size - to)
+ return -EINVAL;
+ if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (!len)
+ return 0;
+ return mtd->_write(mtd, to, len, retlen, buf);
+}
+EXPORT_SYMBOL_GPL(mtd_write);
+
+/*
+ * In blackbox flight recorder like scenarios we want to make successful writes
+ * in interrupt context. panic_write() is only intended to be called when its
+ * known the kernel is about to panic and we need the write to succeed. Since
+ * the kernel is not going to be running for much longer, this function can
+ * break locks and delay to ensure the write succeeds (but not sleep).
+ */
+int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
+ const u_char *buf)
+{
+ *retlen = 0;
+ if (!mtd->_panic_write)
+ return -EOPNOTSUPP;
+ if (to < 0 || to > mtd->size || len > mtd->size - to)
+ return -EINVAL;
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (!len)
+ return 0;
+ return mtd->_panic_write(mtd, to, len, retlen, buf);
+}
+EXPORT_SYMBOL_GPL(mtd_panic_write);
+
+/*
+ * Method to access the protection register area, present in some flash
+ * devices. The user data is one time programmable but the factory data is read
+ * only.
+ */
+int mtd_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf,
+ size_t len)
+{
+ if (!mtd->_get_fact_prot_info)
+ return -EOPNOTSUPP;
+ if (!len)
+ return 0;
+ return mtd->_get_fact_prot_info(mtd, buf, len);
+}
+EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info);
+
+int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ *retlen = 0;
+ if (!mtd->_read_fact_prot_reg)
+ return -EOPNOTSUPP;
+ if (!len)
+ return 0;
+ return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf);
+}
+EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg);
+
+int mtd_get_user_prot_info(struct mtd_info *mtd, struct otp_info *buf,
+ size_t len)
+{
+ if (!mtd->_get_user_prot_info)
+ return -EOPNOTSUPP;
+ if (!len)
+ return 0;
+ return mtd->_get_user_prot_info(mtd, buf, len);
+}
+EXPORT_SYMBOL_GPL(mtd_get_user_prot_info);
+
+int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ *retlen = 0;
+ if (!mtd->_read_user_prot_reg)
+ return -EOPNOTSUPP;
+ if (!len)
+ return 0;
+ return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf);
+}
+EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg);
+
+int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ *retlen = 0;
+ if (!mtd->_write_user_prot_reg)
+ return -EOPNOTSUPP;
+ if (!len)
+ return 0;
+ return mtd->_write_user_prot_reg(mtd, to, len, retlen, buf);
+}
+EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg);
+
+int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len)
+{
+ if (!mtd->_lock_user_prot_reg)
+ return -EOPNOTSUPP;
+ if (!len)
+ return 0;
+ return mtd->_lock_user_prot_reg(mtd, from, len);
+}
+EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg);
+
+/* Chip-supported device locking */
+int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+ if (!mtd->_lock)
+ return -EOPNOTSUPP;
+ if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
+ return -EINVAL;
+ if (!len)
+ return 0;
+ return mtd->_lock(mtd, ofs, len);
+}
+EXPORT_SYMBOL_GPL(mtd_lock);
+
+int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+ if (!mtd->_unlock)
+ return -EOPNOTSUPP;
+ if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
+ return -EINVAL;
+ if (!len)
+ return 0;
+ return mtd->_unlock(mtd, ofs, len);
+}
+EXPORT_SYMBOL_GPL(mtd_unlock);
+
+int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
+{
+ if (!mtd->_is_locked)
+ return -EOPNOTSUPP;
+ if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs)
+ return -EINVAL;
+ if (!len)
+ return 0;
+ return mtd->_is_locked(mtd, ofs, len);
+}
+EXPORT_SYMBOL_GPL(mtd_is_locked);
+
+int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+ if (!mtd->_block_isbad)
+ return 0;
+ if (ofs < 0 || ofs > mtd->size)
+ return -EINVAL;
+ return mtd->_block_isbad(mtd, ofs);
+}
+EXPORT_SYMBOL_GPL(mtd_block_isbad);
+
+int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
+{
+ if (!mtd->_block_markbad)
+ return -EOPNOTSUPP;
+ if (ofs < 0 || ofs > mtd->size)
+ return -EINVAL;
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ return mtd->_block_markbad(mtd, ofs);
+}
+EXPORT_SYMBOL_GPL(mtd_block_markbad);
+
/*
* default_mtd_writev - the default writev method
* @mtd: mtd device description object pointer
unsigned long count, loff_t to, size_t *retlen)
{
*retlen = 0;
- if (!mtd->writev)
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (!mtd->_writev)
return default_mtd_writev(mtd, vecs, count, to, retlen);
- return mtd->writev(mtd, vecs, count, to, retlen);
+ return mtd->_writev(mtd, vecs, count, to, retlen);
}
EXPORT_SYMBOL_GPL(mtd_writev);
projects / deliverable / linux.git / blobdiff