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Message-ID: <e3c8a6c1-a108-0a11-aaf7-f17e1851f6d7@gmail.com>
Date: Fri, 23 Jul 2021 09:33:43 +0200
From: Andre Naujoks <nautsch2@...il.com>
To: Stéphane Grosjean <s.grosjean@...k-system.com>,
"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Expose Peak USB device id in sysfs via phys_port_name.
Am 23.07.21 um 09:24 schrieb Stéphane Grosjean:
> Hi,
>
> We plan to send the patches during the next month.
Thank you for the info! Sounds great. I'm looking forward to it.
Best Regards
Andre
>
> Regards,
>
> — Stéphane
>
>
> ------------------------------------------------------------------------
> *De :* Andre Naujoks <nautsch2@...il.com>
> *Envoyé :* mercredi 21 juillet 2021 15:39
> *À :* Stéphane Grosjean <s.grosjean@...k-system.com>; Wolfgang
> Grandegger <wg@...ndegger.com>; Marc Kleine-Budde <mkl@...gutronix.de>;
> David S. Miller <davem@...emloft.net>; Jakub Kicinski <kuba@...nel.org>;
> Vincent Mailhol <mailhol.vincent@...adoo.fr>; Gustavo A. R. Silva
> <gustavoars@...nel.org>; Pavel Skripkin <paskripkin@...il.com>; Colin
> Ian King <colin.king@...onical.com>; linux-can@...r.kernel.org
> <linux-can@...r.kernel.org>; netdev@...r.kernel.org
> <netdev@...r.kernel.org>; linux-kernel@...r.kernel.org
> <linux-kernel@...r.kernel.org>
> *Objet :* Re: [PATCH v2] Expose Peak USB device id in sysfs via
> phys_port_name.
> Am 21.07.21 um 15:29 schrieb Stéphane Grosjean:
>> Hi,
>>
>> The display and the possibility to change this "device_number" is a current modification of the peak_usb driver. This modification will offer this possibility for all CAN - USB interfaces of PEAK-System.
>
> Hi.
>
> By "current modification" you mean something not yet public? Do you have
> a time frame for when you are planning to make it public? I'd really
> like to use this :-)
>
>>
>> However, it is planned to create new R/W entries for this (under /sys/class/net/canX/...) as is already the case in other USB - CAN interface drivers.
>
> I'd be fine with that. I just chose something, that was already
> available and looked as if it made the most sense without breaking anything.
>
> Thanks for the reply!
> Andre
>
>>
>> — Stéphane
>>
>>
>> De : Andre Naujoks <nautsch2@...il.com>
>> Envoyé : mercredi 21 juillet 2021 14:59
>> À : Wolfgang Grandegger <wg@...ndegger.com>; Marc Kleine-Budde <mkl@...gutronix.de>; David S. Miller <davem@...emloft.net>; Jakub Kicinski <kuba@...nel.org>; Stéphane Grosjean <s.grosjean@...k-system.com>; Vincent Mailhol <mailhol.vincent@...adoo.fr>; Gustavo A. R. Silva <gustavoars@...nel.org>; Pavel Skripkin
> <paskripkin@...il.com>; Colin Ian King <colin.king@...onical.com>; Andre
> Naujoks <nautsch2@...il.com>; linux-can@...r.kernel.org
> <linux-can@...r.kernel.org>; netdev@...r.kernel.org
> <netdev@...r.kernel.org>; linux-kernel@...r.kernel.org
> <linux-kernel@...r.kernel.org>
>> Objet : [PATCH v2] Expose Peak USB device id in sysfs via phys_port_name.
>>
>> The Peak USB CAN adapters can be assigned a device id via the Peak
>> provided tools (pcan-settings). This id can currently not be set by the
>> upstream kernel drivers, but some devices expose this id already.
>>
>> The id can be used for consistent naming of CAN interfaces regardless of
>> order of attachment or recognition on the system. The classical CAN Peak
>> USB adapters expose this id via bcdDevice (combined with another value)
>> on USB-level in the sysfs tree and this value is then available in
>> ID_REVISION from udev. This is not a feasible approach, when a single
>> USB device offers more than one CAN-interface, like e.g. the PCAN-USB
>> Pro FD devices.
>>
>> This patch exposes those ids via the, up to now unused, netdevice sysfs
>> attribute phys_port_name as a simple decimal ASCII representation of the
>> id. phys_port_id was not used, since the default print functions from
>> net/core/net-sysfs.c output a hex-encoded binary value, which is
>> overkill for a one-byte device id, like this one.
>>
>> Signed-off-by: Andre Naujoks <nautsch2@...il.com>
>> ---
>> drivers/net/can/usb/peak_usb/pcan_usb_core.c | 16 ++++++++++++++++
>> 1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
>> index e8f43ed90b72..f6cbb01a58cc 100644
>> --- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
>> +++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
>> @@ -408,6 +408,21 @@ static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb,
>> return NETDEV_TX_OK;
>> }
>>
>> +static int peak_usb_ndo_get_phys_port_name(struct net_device *netdev,
>> + char *name, size_t len)
>> +{
>> + const struct peak_usb_device *dev = netdev_priv(netdev);
>> + int err;
>> +
>> + err = snprintf(name, len, "%u", dev->device_number);
>> +
>> + if (err >= len || err <= 0) {
>> + return -EINVAL;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> /*
>> * start the CAN interface.
>> * Rx and Tx urbs are allocated here. Rx urbs are submitted here.
>> @@ -769,6 +784,7 @@ static const struct net_device_ops peak_usb_netdev_ops = {
>> .ndo_stop = peak_usb_ndo_stop,
>> .ndo_start_xmit = peak_usb_ndo_start_xmit,
>> .ndo_change_mtu = can_change_mtu,
>> + .ndo_get_phys_port_name = peak_usb_ndo_get_phys_port_name,
>> };
>>
>> /*
>> --
>> 2.32.0
>>
>> --
>> PEAK-System Technik GmbH
>> Sitz der Gesellschaft Darmstadt - HRB 9183
>> Geschaeftsfuehrung: Alexander Gach / Uwe Wilhelm
>> Unsere Datenschutzerklaerung mit wichtigen Hinweisen
>> zur Behandlung personenbezogener Daten finden Sie unter
>> www.peak-system.com/Datenschutz.483.0.html
> <http://www.peak-system.com/Datenschutz.483.0.html>
>>
>
>
> --
> PEAK-System Technik GmbH
> Sitz der Gesellschaft Darmstadt - HRB 9183
> Geschaeftsfuehrung: Alexander Gach / Uwe Wilhelm
> Unsere Datenschutzerklaerung mit wichtigen Hinweisen
> zur Behandlung personenbezogener Daten finden Sie unter
> www.peak-system.com/Datenschutz.483.0.html
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