serial: exar: Add support for Sealevel 7xxxC serial cards

Add support for Sealevel 7xxxC serial cards.

This patch:
* Adds IDs to recognize 7xxxC cards from Sealevel Systems.
* Updates exar_pci_probe() to set nr_ports to last two bytes of primary
  dev ID for these cards.

Signed-off-by: Matthew Howell <[email protected]>
Cc: stable <[email protected]>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2301191440010.22558@tstest-VirtualBox
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: 11matt556

drivers/tty/serial/8250/8250_exar.c

@@ -43,6 +43,12 @@
 #define PCI_DEVICE_ID_EXAR_XR17V4358		0x4358
 #define PCI_DEVICE_ID_EXAR_XR17V8358		0x8358
 
+#define PCI_DEVICE_ID_SEALEVEL_710xC		0x1001
+#define PCI_DEVICE_ID_SEALEVEL_720xC		0x1002
+#define PCI_DEVICE_ID_SEALEVEL_740xC		0x1004
+#define PCI_DEVICE_ID_SEALEVEL_780xC		0x1008
+#define PCI_DEVICE_ID_SEALEVEL_716xC		0x1010
+
 #define UART_EXAR_INT0		0x80
 #define UART_EXAR_8XMODE	0x88	/* 8X sampling rate select */
 #define UART_EXAR_SLEEP		0x8b	/* Sleep mode */
@@ -638,6 +644,8 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
 		nr_ports = BIT(((pcidev->device & 0x38) >> 3) - 1);
 	else if (board->num_ports)
 		nr_ports = board->num_ports;
+	else if (pcidev->vendor == PCI_VENDOR_ID_SEALEVEL)
+		nr_ports = pcidev->device & 0xff;
 	else
 		nr_ports = pcidev->device & 0x0f;
 
@@ -864,6 +872,12 @@ static const struct pci_device_id exar_pci_tbl[] = {
 	EXAR_DEVICE(COMMTECH, 4224PCI335, pbn_fastcom335_4),
 	EXAR_DEVICE(COMMTECH, 2324PCI335, pbn_fastcom335_4),
 	EXAR_DEVICE(COMMTECH, 2328PCI335, pbn_fastcom335_8),
+
+	EXAR_DEVICE(SEALEVEL, 710xC, pbn_exar_XR17V35x),
+	EXAR_DEVICE(SEALEVEL, 720xC, pbn_exar_XR17V35x),
+	EXAR_DEVICE(SEALEVEL, 740xC, pbn_exar_XR17V35x),
+	EXAR_DEVICE(SEALEVEL, 780xC, pbn_exar_XR17V35x),
+	EXAR_DEVICE(SEALEVEL, 716xC, pbn_exar_XR17V35x),
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, exar_pci_tbl);