diff mbox series

[net,02/14] can: gs_usb: add usb endpoint address detection at driver probe step

Message ID 20241129122722.1046050-3-mkl@pengutronix.de (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series [net,01/14] can: dev: can_set_termination(): allow sleeping GPIOs | expand

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Context Check Description
netdev/series_format success Pull request is its own cover letter
netdev/tree_selection success Clearly marked for net
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 3 this patch: 3
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 4 of 6 maintainers
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 304 this patch: 304
netdev/checkpatch warning WARNING: line length of 81 exceeds 80 columns WARNING: line length of 83 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest warning net-next-2024-11-29--18-00 (tests: 761)

Commit Message

Marc Kleine-Budde Nov. 29, 2024, 12:16 p.m. UTC 
From: Alexander Kozhinov <ak.alexander.kozhinov@gmail.com>

There is an approach made to implement gs_usb firmware/driver based on
Zephyr RTOS. It was found that USB stack of Zephyr RTOS overwrites USB
EP addresses, if they have different last 4 bytes in absence of other
endpoints.

For example in case of gs_usb candlelight firmware EP-IN is 0x81 and
EP-OUT 0x02. If there are no additional USB endpoints, Zephyr RTOS will
overwrite EP-OUT to 0x01. More information can be found in the
discussion with Zephyr RTOS USB stack maintainer here:

https://github.com/zephyrproject-rtos/zephyr/issues/67812

There are already two different gs_usb FW driver implementations based
on Zephyr RTOS:

1. https://github.com/CANnectivity/cannectivity
   (by: https://github.com/henrikbrixandersen)
2. https://github.com/zephyrproject-rtos/zephyr/compare/main...KozhinovAlexander:zephyr:gs_usb
   (by: https://github.com/KozhinovAlexander)

At the moment both Zephyr RTOS implementations use dummy USB endpoint,
to overcome described USB stack behavior from Zephyr itself. Since
Zephyr RTOS is intended to be used on microcontrollers with very
constrained amount of resources (ROM, RAM) and additional endpoint
requires memory, it is more convenient to update the gs_usb driver in
the Linux kernel.

To fix this problem, update the gs_usb driver from using hard coded
endpoint numbers to evaluate the endpoint descriptors and use the
endpoints provided there.

Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Alexander Kozhinov <ak.alexander.kozhinov@gmail.com>
Link: https://patch.msgid.link/20241018212450.31746-1-ak.alexander.kozhinov@gmail.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/gs_usb.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index bc86e9b329fd..b6f4de375df7 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -43,9 +43,6 @@ 
 #define USB_XYLANTA_SAINT3_VENDOR_ID 0x16d0
 #define USB_XYLANTA_SAINT3_PRODUCT_ID 0x0f30
 
-#define GS_USB_ENDPOINT_IN 1
-#define GS_USB_ENDPOINT_OUT 2
-
 /* Timestamp 32 bit timer runs at 1 MHz (1 µs tick). Worker accounts
  * for timer overflow (will be after ~71 minutes)
  */
@@ -336,6 +333,9 @@  struct gs_usb {
 
 	unsigned int hf_size_rx;
 	u8 active_channels;
+
+	unsigned int pipe_in;
+	unsigned int pipe_out;
 };
 
 /* 'allocate' a tx context.
@@ -687,7 +687,7 @@  static void gs_usb_receive_bulk_callback(struct urb *urb)
 
 resubmit_urb:
 	usb_fill_bulk_urb(urb, parent->udev,
-			  usb_rcvbulkpipe(parent->udev, GS_USB_ENDPOINT_IN),
+			  parent->pipe_in,
 			  hf, dev->parent->hf_size_rx,
 			  gs_usb_receive_bulk_callback, parent);
 
@@ -819,7 +819,7 @@  static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
 	}
 
 	usb_fill_bulk_urb(urb, dev->udev,
-			  usb_sndbulkpipe(dev->udev, GS_USB_ENDPOINT_OUT),
+			  dev->parent->pipe_out,
 			  hf, dev->hf_size_tx,
 			  gs_usb_xmit_callback, txc);
 
@@ -925,8 +925,7 @@  static int gs_can_open(struct net_device *netdev)
 			/* fill, anchor, and submit rx urb */
 			usb_fill_bulk_urb(urb,
 					  dev->udev,
-					  usb_rcvbulkpipe(dev->udev,
-							  GS_USB_ENDPOINT_IN),
+					  dev->parent->pipe_in,
 					  buf,
 					  dev->parent->hf_size_rx,
 					  gs_usb_receive_bulk_callback, parent);
@@ -1413,6 +1412,7 @@  static int gs_usb_probe(struct usb_interface *intf,
 			const struct usb_device_id *id)
 {
 	struct usb_device *udev = interface_to_usbdev(intf);
+	struct usb_endpoint_descriptor *ep_in, *ep_out;
 	struct gs_host_frame *hf;
 	struct gs_usb *parent;
 	struct gs_host_config hconf = {
@@ -1422,6 +1422,13 @@  static int gs_usb_probe(struct usb_interface *intf,
 	unsigned int icount, i;
 	int rc;
 
+	rc = usb_find_common_endpoints(intf->cur_altsetting,
+				       &ep_in, &ep_out, NULL, NULL);
+	if (rc) {
+		dev_err(&intf->dev, "Required endpoints not found\n");
+		return rc;
+	}
+
 	/* send host config */
 	rc = usb_control_msg_send(udev, 0,
 				  GS_USB_BREQ_HOST_FORMAT,
@@ -1466,6 +1473,10 @@  static int gs_usb_probe(struct usb_interface *intf,
 	usb_set_intfdata(intf, parent);
 	parent->udev = udev;
 
+	/* store the detected endpoints */
+	parent->pipe_in = usb_rcvbulkpipe(parent->udev, ep_in->bEndpointAddress);
+	parent->pipe_out = usb_sndbulkpipe(parent->udev, ep_out->bEndpointAddress);
+
 	for (i = 0; i < icount; i++) {
 		unsigned int hf_size_rx = 0;