Serial boards made by RTD using the Exar XR17V358 chip
rely on the extra capabilities of the Exar-provided driver
to allow configuration of the board. When support for
the Exar chip was added to the kernel 8250_pci driver, this
then prevented easy use of the board by customers for anything
other than standard serial usage in RS232 mode.
This patch prevents RTD sub-vendor boards from being bound
by the 8250_pci driver, if it uses the XR17V358 chip. Other
RTD boards using Exar chips are not affected.
Signed-off-by Rob Groner <rgroner@xxxxxxx>
---
drivers/tty/serial/8250/8250_pci.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 68042dd..89baf7f 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -359,6 +359,16 @@ static void pci_ni8430_exit(struct pci_dev *dev)
iounmap(p);
}
+/*
+ * RTD Embedded Technologies, Inc. boards
+ * Prevent from being bound to 8250 driver
+ */
+static int
+pci_xr17v35x_rtd_probe(struct pci_dev *dev)
+{
+ return -ENODEV;
+}
+
/* SBS Technologies Inc. PMC-OCTPRO and P-OCTAL cards */
static int
sbs_setup(struct serial_private *priv, const struct pciserial_board *board,
@@ -2105,6 +2115,8 @@ pci_wch_ch38x_setup(struct serial_private *priv,
#define PCI_DEVICE_ID_PERICOM_PI7C9X7954 0x7954
#define PCI_DEVICE_ID_PERICOM_PI7C9X7958 0x7958
+#define PCI_SUBVENDOR_ID_RTD 0x1435
+
/* Unknown vendors/cards - this should not be in linux/pci_ids.h */
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1584 0x1584
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1588 0x1588
@@ -2608,6 +2620,14 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
{
.vendor = PCI_VENDOR_ID_EXAR,
.device = PCI_DEVICE_ID_EXAR_XR17V358,
+ .subvendor = PCI_SUBVENDOR_ID_RTD,
+ .subdevice = PCI_ANY_ID,
+ .probe = pci_xr17v35x_rtd_probe,
+ .setup = pci_xr17v35x_setup,
+ },
+ {
+ .vendor = PCI_VENDOR_ID_EXAR,
+ .device = PCI_DEVICE_ID_EXAR_XR17V358,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_xr17v35x_setup,
--
1.9.1
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