NFC: Add firmware upload netlink command

As several NFC chipsets can have their firmwares upgraded and
reflashed, this patchset adds a new netlink command to trigger
that the driver loads or flashes a new firmware. This will allows
userspace triggered firmware upgrade through netlink.
The firmware name or hint is passed as a parameter, and the driver
will eventually fetch the firmware binary through the request_firmware
API.
The cmd can only be executed when the nfc dev is not in use. Actual
firmware loading/flashing is an asynchronous operation. Result of the
operation shall send a new event up to user space through the nfc dev
multicast socket. During operation, the nfc dev is not openable and
thus not usable.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index 5eb80bb3cbb2..3563dbdcaaf2 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -70,6 +70,7 @@ struct nfc_ops {
         int (*check_presence)(struct nfc_dev *dev, struct nfc_target *target);
         int (*enable_se)(struct nfc_dev *dev, u32 secure_element);
         int (*disable_se)(struct nfc_dev *dev, u32 secure_element);
+        int (*fw_upload)(struct nfc_dev *dev, const char *firmware_name);
 };
 
 #define NFC_TARGET_IDX_ANY -1
@@ -104,6 +105,7 @@ struct nfc_dev {
         int targets_generation;
         struct device dev;
         bool dev_up;
+        bool fw_upload_in_progress;
         u8 rf_mode;
         bool polling;
         struct nfc_target *active_target;
diff --git a/include/uapi/linux/nfc.h b/include/uapi/linux/nfc.h
index 7c6f627a717d..b6cbd164f146 100644
--- a/include/uapi/linux/nfc.h
+++ b/include/uapi/linux/nfc.h
@@ -69,6 +69,8 @@
  *      starting a poll from a device which has a secure element enabled means
  *      we want to do SE based card emulation.
  * @NFC_CMD_DISABLE_SE: Disable the physical link to a specific secure element.
+ * @NFC_CMD_FW_UPLOAD: Request to Load/flash firmware, or event to inform that
+ *      some firmware was loaded
  */
 enum nfc_commands {
         NFC_CMD_UNSPEC,
@@ -92,6 +94,7 @@ enum nfc_commands {
         NFC_CMD_DISABLE_SE,
         NFC_CMD_LLC_SDREQ,
         NFC_EVENT_LLC_SDRES,
+        NFC_CMD_FW_UPLOAD,
 /* private: internal use only */
         __NFC_CMD_AFTER_LAST
 };
@@ -121,6 +124,7 @@ enum nfc_commands {
  * @NFC_ATTR_LLC_PARAM_RW: Receive Window size parameter
  * @NFC_ATTR_LLC_PARAM_MIUX: MIU eXtension parameter
  * @NFC_ATTR_SE: Available Secure Elements
+ * @NFC_ATTR_FIRMWARE_NAME: Free format firmware version
  */
 enum nfc_attrs {
         NFC_ATTR_UNSPEC,
@@ -143,6 +147,7 @@ enum nfc_attrs {
         NFC_ATTR_LLC_PARAM_MIUX,
         NFC_ATTR_SE,
         NFC_ATTR_LLC_SDP,
+        NFC_ATTR_FIRMWARE_NAME,
 /* private: internal use only */
         __NFC_ATTR_AFTER_LAST
 };
@@ -162,6 +167,7 @@ enum nfc_sdp_attr {
 #define NFC_SENSB_RES_MAXSIZE 12
 #define NFC_SENSF_RES_MAXSIZE 18
 #define NFC_GB_MAXSIZE        48
+#define NFC_FIRMWARE_NAME_MAXSIZE 32
 
 /* NFC protocols */
 #define NFC_PROTO_JEWEL         1