drivers: [FEATURE] allow card serial number to be string

drivers/kernel/drivers/nfb/boot/boot.c

@@ -353,7 +353,11 @@ int nfb_boot_attach(struct nfb_device *nfb, void **priv)
 
 	fdt_offset = fdt_path_offset(nfb->fdt, "/board");
 	fdt_setprop_string(nfb->fdt, fdt_offset, "board-name", nfb->pci_name);
-	fdt_setprop_u32(nfb->fdt, fdt_offset, "serial-number", nfb->serial);
+	if (nfb->serial_str) {
+		fdt_setprop_string(nfb->fdt, fdt_offset, "serial-number-string", nfb->serial_str);
+	} else {
+		fdt_setprop_string(nfb->fdt, fdt_offset, "serial-number", nfb->serial);
+	}
 
 	dev_info(&nfb->pci->dev, "nfb_boot: Attached successfully\n");
 

drivers/kernel/drivers/nfb/boot/nfb-pmci.c

@@ -298,7 +298,7 @@ static struct regmap_config m10bmc_pmci_regmap_config = {
 
 int nfb_pmci_attach(struct nfb_boot *boot)
 {
-	char * pmci_bom_info, *snc;
+	char * pmci_bom_info, *snc, *snc_end;
 
 	struct nfb_device *nfb = boot->nfb;
 	struct pmci_device *pmci;
@@ -362,6 +362,15 @@ int nfb_pmci_attach(struct nfb_boot *boot)
 			if ((snc = strstr(pmci_bom_info, "\nSN,"))) {
 				if (sscanf(snc, "\nSN,%d\n", &sn) == 1) {
 					boot->nfb->serial = sn;
+				} else {
+					snc_end = strstr(snc+1, "\n");
+					if (snc_end) {
+						snc_end[0] = 0;
+						snc += strlen("\nSN,");
+						while (isspace(snc[0]))
+							snc += 1;
+						boot->nfb->serial_str = kstrdup(snc, GFP_KERNEL);
+					}
 				}
 			}
 			kfree(pmci_bom_info);

drivers/kernel/drivers/nfb/char.c

@@ -34,6 +34,9 @@ struct spinlock open_lock;
 static ssize_t nfb_char_get_serial(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct nfb_device *nfb = dev_get_drvdata(dev);
+	if (nfb->serial_str) {
+		return scnprintf(buf, PAGE_SIZE, "%s\n", nfb->serial_str);
+	}
 	return scnprintf(buf, PAGE_SIZE, "%lld\n", nfb->serial);
 }
 static ssize_t nfb_char_get_cardname(struct device *dev, struct device_attribute *attr, char *buf)

drivers/kernel/drivers/nfb/core.c

@@ -147,6 +147,8 @@ struct nfb_device *nfb_create(void)
  */
 void nfb_destroy(struct nfb_device *nfb)
 {
+	if (nfb->serial_str)
+		kfree(nfb->serial_str);
 	kfree(nfb);
 }
 

drivers/kernel/drivers/nfb/nfb.h

@@ -108,6 +108,7 @@ struct nfb_lock_item {
 struct nfb_device {
 	struct pci_dev *pci;                   /* Associated PCI device (master) */
 	int minor;                             /* Minor number assigned to this device (used for X in /dev/nfbX) */
+	const char *serial_str;                /* String version of serial number. If is NULL, the 'serial' member should be used. */
 	uint64_t serial;                       /* Card serial number */
 	uint64_t dsn;                          /* FPGA chip unique identifier */
 	enum nfb_device_status status;