Commit 15bce40c authored by David Woodhouse's avatar David Woodhouse
Browse files

[MTD] Restore suspend/resume support for mtd devices 



This is intended to suspend/resume the _chip_, while we leave board
drivers to handle their own suspend/resume for the controller.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent d694846b

drivers/mtd/mtdcore.c

+37 −10
Original line number Diff line number Diff line
@@ -23,8 +23,15 @@ 


#include "mtdcore.h"



static int mtd_cls_suspend(struct device *dev, pm_message_t state);

static int mtd_cls_resume(struct device *dev);



static struct class *mtd_class;

static struct class mtd_class = {

	.name = "mtd",

	.owner = THIS_MODULE,

	.suspend = mtd_cls_suspend,

	.resume = mtd_cls_resume,

};



/* These are exported solely for the purpose of mtd_blkdevs.c. You

   should not use them for _anything_ else */
@@ -52,7 +59,26 @@ static void mtd_release(struct device *dev) 


	/* remove /dev/mtdXro node if needed */

	if (index)

		device_destroy(mtd_class, index + 1);

		device_destroy(&mtd_class, index + 1);

}



static int mtd_cls_suspend(struct device *dev, pm_message_t state)

{

	struct mtd_info *mtd = dev_to_mtd(dev);

	

	if (mtd->suspend)

		return mtd->suspend(mtd);

	else

		return 0;

}



static int mtd_cls_resume(struct device *dev)

{

	struct mtd_info *mtd = dev_to_mtd(dev);

	

	if (mtd->resume)

		mtd->resume(mtd);

	return 0;

}



static ssize_t mtd_type_show(struct device *dev,
@@ -269,7 +295,7 @@ int add_mtd_device(struct mtd_info *mtd) 
			 * physical device.

			 */

			mtd->dev.type = &mtd_devtype;

			mtd->dev.class = mtd_class;

			mtd->dev.class = &mtd_class;

			mtd->dev.devt = MTD_DEVT(i);

			dev_set_name(&mtd->dev, "mtd%d", i);

			if (device_register(&mtd->dev) != 0) {
@@ -278,7 +304,7 @@ int add_mtd_device(struct mtd_info *mtd) 
			}



			if (MTD_DEVT(i))

				device_create(mtd_class, mtd->dev.parent,

				device_create(&mtd_class, mtd->dev.parent,

						MTD_DEVT(i) + 1,

						NULL, "mtd%dro", i);
@@ -604,11 +630,12 @@ static int mtd_read_proc (char *page, char **start, off_t off, int count, 


static int __init init_mtd(void)

{

	mtd_class = class_create(THIS_MODULE, "mtd");

	int ret;

	ret = class_register(&mtd_class);



	if (IS_ERR(mtd_class)) {

		pr_err("Error creating mtd class.\n");

		return PTR_ERR(mtd_class);

	if (ret) {

		pr_err("Error registering mtd class: %d\n", ret);

		return ret;

	}

#ifdef CONFIG_PROC_FS

	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
@@ -623,7 +650,7 @@ static void __exit cleanup_mtd(void) 
        if (proc_mtd)

		remove_proc_entry( "mtd", NULL);

#endif /* CONFIG_PROC_FS */

	class_destroy(mtd_class);

	class_unregister(&mtd_class);

}



module_init(init_mtd);