NFC: nci: Add firmware download support

A simple forward for firmware download (i.e. sending a new firmware
to the NFC adapter) from the NFC subsystem to the drivers.

This feature is required to update the firmware of NXP-NCI NFC
controllers but can be used by any NCI driver.

This feature has been present in the HCI subsystem since 9a695d.
Signed-off-by: Clément Perrochaud <clement.perrochaud@effinnov.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

include/net/nfc/nci_core.h

@@ -71,6 +71,7 @@ struct nci_ops {
 	int   (*close)(struct nci_dev *ndev);
 	int   (*send)(struct nci_dev *ndev, struct sk_buff *skb);
 	int   (*setup)(struct nci_dev *ndev);
+	int   (*fw_download)(struct nci_dev *ndev, const char *firmware_name);
 	__u32 (*get_rfprotocol)(struct nci_dev *ndev, __u8 rf_protocol);
 	int   (*discover_se)(struct nci_dev *ndev);
 	int   (*disable_se)(struct nci_dev *ndev, u32 se_idx);

net/nfc/nci/core.c

@@ -907,6 +907,16 @@ static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
 	return 0;
 }
 
+static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
+{
+	struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
+
+	if (!ndev->ops->fw_download)
+		return -ENOTSUPP;
+
+	return ndev->ops->fw_download(ndev, firmware_name);
+}
+
 static struct nfc_ops nci_nfc_ops = {
 	.dev_up = nci_dev_up,
 	.dev_down = nci_dev_down,
@@ -922,6 +932,7 @@ static struct nfc_ops nci_nfc_ops = {
 	.disable_se = nci_disable_se,
 	.discover_se = nci_discover_se,
 	.se_io = nci_se_io,
+	.fw_download = nci_fw_download,
 };
 
 /* ---- Interface to NCI drivers ---- */