From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: Christoph Fritz <christoph.fritz@hexdev.de>
Cc: Jiri Slaby <jirislaby@kernel.org>,
Simon Horman <horms@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Marc Kleine-Budde <mkl@pengutronix.de>,
Oliver Hartkopp <socketcan@hartkopp.net>,
Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Jiri Kosina <jikos@kernel.org>,
Benjamin Tissoires <bentiss@kernel.org>,
Sebastian Reichel <sre@kernel.org>,
Linus Walleij <linus.walleij@linaro.org>,
Andreas Lauser <andreas.lauser@mercedes-benz.com>,
Jonathan Corbet <corbet@lwn.net>,
Pavel Pisa <pisa@cmp.felk.cvut.cz>,
linux-can@vger.kernel.org, Netdev <netdev@vger.kernel.org>,
devicetree@vger.kernel.org, linux-input@vger.kernel.org,
linux-serial <linux-serial@vger.kernel.org>
Subject: Re: [PATCH v4 10/11] can: lin: Support setting LIN mode
Date: Fri, 10 May 2024 17:39:14 +0300 (EEST) [thread overview]
Message-ID: <b796b3ac-df5e-e39a-7ae2-db7b7829abaa@linux.intel.com> (raw)
In-Reply-To: <20240509171736.2048414-11-christoph.fritz@hexdev.de>
On Thu, 9 May 2024, Christoph Fritz wrote:
> A LIN node can work as commander or responder, so introduce a new
> control mode (CAN_CTRLMODE_LIN_COMMANDER) for configuration.
>
> This enables e.g. the userland tool ip from iproute2 to turn on
> commander mode when the device is being brought up.
>
> Signed-off-by: Christoph Fritz <christoph.fritz@hexdev.de>
> ---
> drivers/net/can/lin.c | 40 +++++++++++++++++++++++++++++++-
> include/net/lin.h | 7 ++++++
> include/uapi/linux/can/netlink.h | 1 +
> 3 files changed, 47 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/can/lin.c b/drivers/net/can/lin.c
> index f77abd7d7d21c..03ddf5d5a31b8 100644
> --- a/drivers/net/can/lin.c
> +++ b/drivers/net/can/lin.c
> @@ -262,11 +262,40 @@ static netdev_tx_t lin_start_xmit(struct sk_buff *skb,
> return NETDEV_TX_OK;
> }
>
> +static int lin_update_mode(struct net_device *ndev)
> +{
> + struct lin_device *ldev = netdev_priv(ndev);
> + u32 ctrlmode = ldev->can.ctrlmode;
> + enum lin_mode lm;
> + int ret = 0;
> +
> + lm = (ctrlmode & CAN_CTRLMODE_LIN_COMMANDER) ? LINBUS_COMMANDER :
> + LINBUS_RESPONDER;
> + if (ldev->lmode != lm) {
> + if (!ldev->ldev_ops->update_lin_mode) {
> + netdev_err(ndev, "setting lin mode unsupported\n");
In user visible messages, it would be best to use the expected
capitalization, which I suppose is LIN given you use capitals in the
commit message yourself?
> + return -EINVAL;
> + }
> + ret = ldev->ldev_ops->update_lin_mode(ldev, lm);
> + if (ret) {
> + netdev_err(ndev, "Failed to set lin mode: %d\n", ret);
Ditto.
There might be other cases in any of the patches, please check.
> + return ret;
> + }
> + ldev->lmode = lm;
> + }
> +
> + return ret;
> +}
> +
> static int lin_open(struct net_device *ndev)
> {
> struct lin_device *ldev = netdev_priv(ndev);
> int ret;
>
> + ret = lin_update_mode(ndev);
> + if (ret)
> + return ret;
> +
> ldev->tx_busy = false;
>
> ret = open_candev(ndev);
> @@ -443,7 +472,7 @@ struct lin_device *register_lin(struct device *dev,
> ndev->sysfs_groups[0] = &lin_sysfs_group;
> ldev->can.bittiming.bitrate = LIN_DEFAULT_BAUDRATE;
> ldev->can.ctrlmode = CAN_CTRLMODE_LIN;
> - ldev->can.ctrlmode_supported = 0;
> + ldev->can.ctrlmode_supported = CAN_CTRLMODE_LIN_COMMANDER;
> ldev->can.bitrate_const = lin_bitrate;
> ldev->can.bitrate_const_cnt = ARRAY_SIZE(lin_bitrate);
> ldev->can.do_set_bittiming = lin_set_bittiming;
> @@ -458,6 +487,15 @@ struct lin_device *register_lin(struct device *dev,
> goto exit_candev;
> }
>
> + ldev->lmode = LINBUS_RESPONDER;
> + if (ldev->ldev_ops->update_lin_mode) {
> + ret = ldev->ldev_ops->update_lin_mode(ldev, ldev->lmode);
> + if (ret) {
> + netdev_err(ndev, "updating lin mode failed\n");
Ditto.
> + goto exit_candev;
> + }
> + }
> +
> ret = register_candev(ndev);
> if (ret)
> goto exit_candev;
> diff --git a/include/net/lin.h b/include/net/lin.h
> index 31bb0feefd188..63ac870a0ab6f 100644
> --- a/include/net/lin.h
> +++ b/include/net/lin.h
> @@ -36,6 +36,11 @@ struct lin_attr {
> struct lin_device *ldev;
> };
>
> +enum lin_mode {
> + LINBUS_RESPONDER = 0,
> + LINBUS_COMMANDER,
> +};
> +
> struct lin_device {
> struct can_priv can; /* must be the first member */
> struct net_device *ndev;
> @@ -45,6 +50,7 @@ struct lin_device {
> struct work_struct tx_work;
> bool tx_busy;
> struct sk_buff *tx_skb;
> + enum lin_mode lmode;
> };
>
> enum lin_checksum_mode {
> @@ -71,6 +77,7 @@ struct lin_device_ops {
> int (*ldo_open)(struct lin_device *ldev);
> int (*ldo_stop)(struct lin_device *ldev);
> int (*ldo_tx)(struct lin_device *ldev, const struct lin_frame *frame);
> + int (*update_lin_mode)(struct lin_device *ldev, enum lin_mode lm);
> int (*update_bitrate)(struct lin_device *ldev, u16 bitrate);
> int (*update_responder_answer)(struct lin_device *ldev,
> const struct lin_responder_answer *answ);
> diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
> index a37f56d86c5f2..cc390f6444d59 100644
> --- a/include/uapi/linux/can/netlink.h
> +++ b/include/uapi/linux/can/netlink.h
> @@ -104,6 +104,7 @@ struct can_ctrlmode {
> #define CAN_CTRLMODE_TDC_AUTO 0x200 /* CAN transiver automatically calculates TDCV */
> #define CAN_CTRLMODE_TDC_MANUAL 0x400 /* TDCV is manually set up by user */
> #define CAN_CTRLMODE_LIN BIT(11) /* LIN bus mode */
> +#define CAN_CTRLMODE_LIN_COMMANDER BIT(12) /* LIN bus specific commander mode */
>
> /*
> * CAN device statistics
>
--
i.
next prev parent reply other threads:[~2024-05-10 14:39 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 17:17 [PATCH v4 00/11] LIN Bus support for Linux Christoph Fritz
2024-05-09 17:17 ` [PATCH v4 01/11] can: Add LIN bus as CAN abstraction Christoph Fritz
2024-05-10 13:23 ` Ilpo Järvinen
2024-05-13 9:52 ` Simon Horman
2024-05-09 17:17 ` [PATCH v4 02/11] HID: hexLIN: Add support for USB LIN adapter Christoph Fritz
2024-05-10 13:46 ` Ilpo Järvinen
2024-05-11 8:14 ` Christoph Fritz
2024-05-13 12:27 ` Ilpo Järvinen
2024-05-13 5:26 ` Jiri Slaby
2024-05-09 17:17 ` [PATCH v4 03/11] treewide, serdev: add flags argument to receive_buf() Christoph Fritz
2024-05-10 14:11 ` Ilpo Järvinen
2024-05-09 17:17 ` [PATCH v4 04/11] tty: serdev: Add method to enable break flags Christoph Fritz
2024-05-10 14:21 ` Ilpo Järvinen
2024-05-12 13:08 ` Christoph Fritz
2024-05-13 12:30 ` Ilpo Järvinen
2024-05-09 17:17 ` [PATCH v4 05/11] dt-bindings: vendor-prefixes: Add hexDEV Christoph Fritz
2024-05-09 17:17 ` [PATCH v4 06/11] dt-bindings: net/can: Add serial LIN adapter hexLINSER Christoph Fritz
2024-05-09 18:09 ` Conor Dooley
2024-05-09 17:17 ` [PATCH v4 07/11] can: Add support for hexDEV " Christoph Fritz
2024-05-10 14:32 ` Ilpo Järvinen
2024-05-09 17:17 ` [PATCH v4 08/11] can: bcm: Add LIN answer offloading for responder mode Christoph Fritz
2024-05-09 17:17 ` [PATCH v4 09/11] can: lin: Handle rx offload config frames Christoph Fritz
2024-05-10 14:36 ` Ilpo Järvinen
2024-05-09 17:17 ` [PATCH v4 10/11] can: lin: Support setting LIN mode Christoph Fritz
2024-05-10 14:39 ` Ilpo Järvinen [this message]
2024-05-09 17:17 ` [PATCH v4 11/11] HID: hexLIN: Implement ability to update lin mode Christoph Fritz
2024-05-18 18:29 ` [PATCH v4 00/11] LIN Bus support for Linux Christoph Fritz
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