From: Marc Kleine-Budde <mkl@pengutronix.de>
To: Fabio Baltieri <fabio.baltieri@gmail.com>
Cc: linux-can@vger.kernel.org, linux-kernel@vger.kernel.org,
Oliver Hartkopp <socketcan@hartkopp.net>,
Wolfgang Grandegger <wg@grandegger.com>
Subject: Re: [PATCH can-next v3 1/2] can: add tx/rx LED trigger support
Date: Tue, 31 Jul 2012 09:10:00 +0200 [thread overview]
Message-ID: <501784C8.9050803@pengutronix.de> (raw)
In-Reply-To: <20120731065733.GA30267@gmail.com>
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On 07/31/2012 08:57 AM, Fabio Baltieri wrote:
> Hi Marc,
>
> On Mon, Jul 30, 2012 at 11:17:53PM +0200, Marc Kleine-Budde wrote:
>> On 07/30/2012 09:20 PM, Fabio Baltieri wrote:
>>> This patch implements the functions to add two LED triggers, named
>>> <ifname>-tx and <ifname>-rx, to a canbus device driver.
>>>
>>> Triggers are called from specific handlers by each CAN device driver and
>>> can be disabled altogether with a Kconfig option.
>>>
>>> The implementation keeps the LED on when the interface is UP and blinks
>>> the LED on network activity at a configurable rate.
>>>
>>> This only supports can-dev based drivers, as it uses some support field
>>> in the can_priv structure.
>>>
>>> Supported drivers should call can_led_init(), can_led_exit() and
>>> can_led_event() as needed.
>>>
>>> Supported events are:
>>> - CAN_LED_EVENT_OPEN: turn on tx/rx LEDs
>>> - CAN_LED_EVENT_STOP: turn off tx/rx LEDs
>>> - CAN_LED_EVENT_TX: trigger tx LED blink
>>> - CAN_LED_EVENT_RX: trigger tx LED blink
>>>
>>> Cc: Oliver Hartkopp <socketcan@hartkopp.net>
>>> Cc: Wolfgang Grandegger <wg@grandegger.com>
>>> Cc: Marc Kleine-Budde <mkl@pengutronix.de>
>>> Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
>>> ---
>>>
>>> Hi all!
>>>
>>> This is the v3 of my CAN LED trigger patch. It's a major refactoring of the v2
>>> that was discussed about three months ago concluding with the idea that
>>> implementing the oneshot triggering code in the LED framework would be a better
>>> solution.
>>>
>>> This is the old thread for reference:
>>> http://marc.info/?l=linux-can&m=133521499002898&w=2
>>>
>>> So, generic oneshot trigger code is now merged in mainline (see 5bb629c), and
>>> these are the changes in the v3:
>>>
>>> - use the new led_trigger_blink_oneshot() function for LED triggering
>>> - use kasprintf() and led_trigger_{un}register_simple for LED allocation
>>> - add some usage note in the comments
>>>
>>> The resulting code is quite simple now and - I think - a bit less intrusive.
>>> Still, I hope on some feedback from the community as I don't have that much
>>> hardware to test it - this version has been tested mainly on an x86 with a
>>> custom usb-can interface.
>>>
>>> In 2/2 there is a sample implementation for the flexcan driver, which is
>>> basically unchanged from the old version.
>>>
>>> Any comments?
>>> Fabio
>>
>> Looks quite clean now. Can you provide a devm implementation, too?
>>
>> Marc
>>>
>>> drivers/net/can/Kconfig | 12 ++++++
>>> drivers/net/can/Makefile | 2 +
>>> drivers/net/can/led.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++
>>> include/linux/can/dev.h | 8 ++++
>>> include/linux/can/led.h | 38 +++++++++++++++++++
>>> 5 files changed, 159 insertions(+)
>>> create mode 100644 drivers/net/can/led.c
>>> create mode 100644 include/linux/can/led.h
>>>
>>> diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
>>> index bb709fd..19dec19 100644
>>> --- a/drivers/net/can/Kconfig
>>> +++ b/drivers/net/can/Kconfig
>>> @@ -54,6 +54,18 @@ config CAN_CALC_BITTIMING
>>> arguments "tq", "prop_seg", "phase_seg1", "phase_seg2" and "sjw".
>>> If unsure, say Y.
>>>
>>> +config CAN_LEDS
>>> + bool "Enable LED triggers for Netlink based drivers"
>>> + depends on CAN_DEV
>>> + depends on LEDS_CLASS
>>> + select LEDS_TRIGGERS
>>> + ---help---
>>> + This option adds two LED triggers for packet receive and transmit
>>> + events on each supported CAN device.
>>> +
>>> + Say Y here if you are working on a system with led-class supported
>>> + LEDs and you want to use them as canbus activity indicators.
>>> +
>>> config CAN_AT91
>>> tristate "Atmel AT91 onchip CAN controller"
>>> depends on CAN_DEV && (ARCH_AT91SAM9263 || ARCH_AT91SAM9X5)
>>> diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
>>> index 938be37..24ee98b 100644
>>> --- a/drivers/net/can/Makefile
>>> +++ b/drivers/net/can/Makefile
>>> @@ -8,6 +8,8 @@ obj-$(CONFIG_CAN_SLCAN) += slcan.o
>>> obj-$(CONFIG_CAN_DEV) += can-dev.o
>>> can-dev-y := dev.o
>>>
>>> +can-dev-$(CONFIG_CAN_LEDS) += led.o
>>> +
>>> obj-y += usb/
>>> obj-y += softing/
>>>
>>> diff --git a/drivers/net/can/led.c b/drivers/net/can/led.c
>>> new file mode 100644
>>> index 0000000..68c4f30
>>> --- /dev/null
>>> +++ b/drivers/net/can/led.c
>>> @@ -0,0 +1,99 @@
>>> +/*
>>> + * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
>>> + *
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License version 2 as
>>> + * published by the Free Software Foundation.
>>> + */
>>> +
>>> +#include <linux/module.h>
>>> +#include <linux/kernel.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/netdevice.h>
>>> +#include <linux/can/dev.h>
>>> +
>>> +#include <linux/can/led.h>
>>> +
>>> +static unsigned long led_delay = 50;
>>> +module_param(led_delay, ulong, 0644);
>>> +MODULE_PARM_DESC(led_delay,
>>> + "blink delay time for activity leds (msecs, default: 50).");
>>> +
>>> +/*
>>> + * Trigger a LED event in response to a CAN device event
>>> + */
>>> +void can_led_event(struct net_device *netdev, enum can_led_event event)
>>> +{
>>> + struct can_priv *priv = netdev_priv(netdev);
>>> +
>>> + switch (event) {
>>> + case CAN_LED_EVENT_OPEN:
>>> + led_trigger_event(priv->tx_led_trig, LED_FULL);
>>> + led_trigger_event(priv->rx_led_trig, LED_FULL);
>>> + break;
>>> + case CAN_LED_EVENT_STOP:
>>> + led_trigger_event(priv->tx_led_trig, LED_OFF);
>>> + led_trigger_event(priv->rx_led_trig, LED_OFF);
>>> + break;
>>> + case CAN_LED_EVENT_TX:
>>> + if (led_delay)
>>> + led_trigger_blink_oneshot(priv->tx_led_trig,
>>> + &led_delay, &led_delay, 1);
>>> + break;
>>> + case CAN_LED_EVENT_RX:
>>> + if (led_delay)
>>> + led_trigger_blink_oneshot(priv->rx_led_trig,
>>> + &led_delay, &led_delay, 1);
>>> + break;
>>> + }
>>> +}
>>> +EXPORT_SYMBOL_GPL(can_led_event);
>>> +
>>> +/*
>>> + * Register CAN LED triggers for a CAN device
>>> + *
>>> + * This is normally called from a driver's probe function
>>> + */
>>> +void can_led_init(struct net_device *netdev)
>>> +{
>>> + struct can_priv *priv = netdev_priv(netdev);
>>> +
>>> + priv->tx_led_trig_name = kasprintf(GFP_KERNEL, "%s-tx", netdev->name);
>>> + if (!priv->tx_led_trig_name)
>>> + goto tx_led_failed;
>>> +
>>> + priv->rx_led_trig_name = kasprintf(GFP_KERNEL, "%s-rx", netdev->name);
>>> + if (!priv->rx_led_trig_name)
>>> + goto rx_led_failed;
>>> +
>>> + led_trigger_register_simple(priv->tx_led_trig_name,
>>> + &priv->tx_led_trig);
>>> + led_trigger_register_simple(priv->rx_led_trig_name,
>>> + &priv->rx_led_trig);
>>> +
>>> + return;
>>> +
>>> +rx_led_failed:
>>> + kfree(priv->tx_led_trig_name);
>>> + priv->tx_led_trig_name = NULL;
>>> +tx_led_failed:
>>> + return;
>>> +}
>>> +EXPORT_SYMBOL_GPL(can_led_init);
>>
>> Can you provide a devm implementation for can_led?
>
> Sounds reasonable, you mean like a devm_kasprintf implementation to
> remove kfree and unwinding code?
IMHO it would be sufficient if you implement the devm cleanup functions
here.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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next prev parent reply other threads:[~2012-07-31 7:10 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-30 19:20 [PATCH can-next v3 1/2] can: add tx/rx LED trigger support Fabio Baltieri
2012-07-30 19:20 ` [PATCH can-next v3 2/2] can: flexcan: add " Fabio Baltieri
2012-07-30 21:17 ` [PATCH can-next v3 1/2] can: add tx/rx " Marc Kleine-Budde
2012-07-31 6:57 ` Fabio Baltieri
2012-07-31 7:10 ` Marc Kleine-Budde [this message]
2012-07-31 11:57 ` Fabio Baltieri
2012-07-31 12:00 ` Marc Kleine-Budde
2012-07-31 22:05 ` [PATCH can-next v4] " Fabio Baltieri
2012-08-01 9:36 ` Marc Kleine-Budde
2012-08-01 10:07 ` Marc Kleine-Budde
2012-08-01 10:30 ` Fabio Baltieri
2012-08-01 11:37 ` Marc Kleine-Budde
2012-08-01 11:49 ` [PATCH can-next v5 1/2] " Fabio Baltieri
2012-08-01 11:49 ` [PATCH can-next v5 2/2] can: flexcan: add " Fabio Baltieri
2012-08-01 11:53 ` Marc Kleine-Budde
2012-08-01 12:24 ` Fabio Baltieri
2012-08-01 12:30 ` Marc Kleine-Budde
2012-08-01 21:02 ` Marc Kleine-Budde
2012-08-01 11:59 ` [PATCH can-next v5 1/2] can: add tx/rx " Marc Kleine-Budde
2012-08-01 12:06 ` Oliver Hartkopp
2012-08-01 12:18 ` Marc Kleine-Budde
2012-08-01 18:21 ` [PATCH can-next v6] " Fabio Baltieri
2012-08-01 21:00 ` Marc Kleine-Budde
2012-08-01 22:38 ` Fabio Baltieri
2012-08-01 21:05 ` Oliver Hartkopp
2012-08-24 5:10 ` Kurt Van Dijck
2012-08-24 11:28 ` Marc Kleine-Budde
2012-08-24 12:42 ` Kurt Van Dijck
2012-08-24 22:01 ` Fabio Baltieri
2012-08-25 20:25 ` Kurt Van Dijck
2012-09-03 12:40 ` Marc Kleine-Budde
2012-09-03 18:13 ` Kurt Van Dijck
2012-09-03 18:29 ` Fabio Baltieri
2012-09-03 20:54 ` Oliver Hartkopp
2012-09-04 7:11 ` Kurt Van Dijck
2012-09-04 9:29 ` [PATCH] can: rename LED trigger name on netdev renames Kurt Van Dijck
2012-09-06 18:59 ` Fabio Baltieri
2012-09-06 19:31 ` Oliver Hartkopp
2012-09-06 20:46 ` Fabio Baltieri
2012-09-07 7:19 ` Kurt Van Dijck
2012-09-09 16:17 ` [PATCH v2] " Fabio Baltieri
2012-09-10 14:25 ` [PATCH] can: export a safe netdev_priv wrapper for candev Kurt Van Dijck
2012-09-10 18:22 ` Oliver Hartkopp
2012-09-10 18:29 ` Fabio Baltieri
2012-09-10 19:55 ` [PATCH v2] " Kurt Van Dijck
2012-09-10 14:28 ` [PATCH v3] can: rename LED trigger name on netdev renames Kurt Van Dijck
2012-09-10 18:25 ` Oliver Hartkopp
2012-09-10 18:40 ` Fabio Baltieri
2012-09-10 19:01 ` Oliver Hartkopp
2012-09-10 20:08 ` Kurt Van Dijck
2012-09-11 5:42 ` Oliver Hartkopp
2012-09-11 7:13 ` Fabio Baltieri
2012-09-12 7:22 ` Kurt Van Dijck
2012-09-11 8:05 ` Kurt Van Dijck
2012-09-10 20:06 ` [PATCH v4] " Kurt Van Dijck
2012-09-11 21:04 ` Fabio Baltieri
2012-09-04 20:15 ` [PATCH can-next v6] can: add tx/rx LED trigger support Fabio Baltieri
2012-09-06 10:33 ` Kurt Van Dijck
2012-09-06 11:17 ` Fabio Baltieri
2012-09-06 15:11 ` Kurt Van Dijck
2012-09-06 20:57 ` Fabio Baltieri
2012-09-07 7:04 ` Kurt Van Dijck
2012-09-07 18:59 ` Fabio Baltieri
2012-07-31 8:46 ` [PATCH can-next v3 1/2] " Wolfgang Grandegger
2012-07-31 10:12 ` Marc Kleine-Budde
2012-07-31 11:55 ` Fabio Baltieri
2012-07-31 12:14 ` Fabio Baltieri
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