This adds nvmem support for misc devices. Short reads/writes are not allowed, so we need to translate the return code a bit. This breaks the API slightly, because the original buffer shouldn't be touched if we fail while writing. If this becomes an issue, we can add a bounce buffer here.
Signed-off-by: Sean Anderson sean.anderson@seco.com ---
drivers/misc/misc-uclass.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/misc/misc-uclass.c b/drivers/misc/misc-uclass.c index cfe9d562fa..6bbc78c38a 100644 --- a/drivers/misc/misc-uclass.c +++ b/drivers/misc/misc-uclass.c @@ -9,6 +9,7 @@ #include <dm.h> #include <errno.h> #include <misc.h> +#include <nvmem.h>
/* * Implement a miscellaneous uclass for those do not fit other more @@ -74,3 +75,33 @@ UCLASS_DRIVER(misc) = { .post_bind = dm_scan_fdt_dev, #endif }; + +static int misc_nvmem_read(struct udevice *dev, unsigned int offset, void *buf, + size_t size) +{ + int ret = misc_read(dev, offset, buf, size); + + if (ret < 0) + return ret; + if (ret != size) + return -EIO; + return 0; +} + +static int misc_nvmem_write(struct udevice *dev, unsigned int offset, + const void *buf, size_t size) +{ + int ret = misc_write(dev, offset, buf, size); + + if (ret < 0) + return ret; + if (ret != size) + return -EIO; + return 0; +} + +NVMEM_INTERFACE(misc) = { + .id = UCLASS_MISC, + .read = misc_nvmem_read, + .write = misc_nvmem_write, +};