mtd: OneNAND: add enable / disable methods to onenand_chip

Add enable / disable methods called from get_device() / release_device().
These can be used, for example, to allow the driver to prevent the voltage
regulator from being put to sleep while OneNAND is in use.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index 2d7c90de3144..2edef5868ace 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -948,6 +948,8 @@ static int onenand_get_device(struct mtd_info *mtd, int new_state)
                 if (this->state == FL_READY) {
                         this->state = new_state;
                         spin_unlock(&this->chip_lock);
+                        if (new_state != FL_PM_SUSPENDED && this->enable)
+                                this->enable(mtd);
                         break;
                 }
                 if (new_state == FL_PM_SUSPENDED) {
@@ -974,6 +976,8 @@ static void onenand_release_device(struct mtd_info *mtd)
 {
         struct onenand_chip *this = mtd->priv;
 
+        if (this->state != FL_PM_SUSPENDED && this->disable)
+                this->disable(mtd);
         /* Release the chip */
         spin_lock(&this->chip_lock);
         this->state = FL_READY;
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 6da3fe314828..ae418e41d8f5 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -118,6 +118,8 @@ struct onenand_chip {
         int (*chip_probe)(struct mtd_info *mtd);
         int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
         int (*scan_bbt)(struct mtd_info *mtd);
+        int (*enable)(struct mtd_info *mtd);
+        int (*disable)(struct mtd_info *mtd);
 
         struct completion       complete;
         int                     irq;