From: Andrew Lunn <andrew@lunn.ch>
To: "Marek Behún" <marek.behun@nic.cz>
Cc: netdev@vger.kernel.org, linux-leds@vger.kernel.org,
"Pavel Machek" <pavel@ucw.cz>,
jacek.anaszewski@gmail.com, "Dan Murphy" <dmurphy@ti.com>,
"Ondřej Jirman" <megous@megous.com>,
"Russell King" <linux@armlinux.org.uk>,
"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
"Gregory Clement" <gregory.clement@bootlin.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC leds + net-next v3 1/2] net: phy: add API for LEDs controlled by PHY HW
Date: Sat, 25 Jul 2020 18:22:31 +0200 [thread overview]
Message-ID: <20200725162231.GJ1472201@lunn.ch> (raw)
In-Reply-To: <20200724164603.29148-2-marek.behun@nic.cz>
On Fri, Jul 24, 2020 at 06:46:02PM +0200, Marek Behún wrote:
> Many PHYs support various HW control modes for LEDs connected directly
> to them.
>
> This code adds a new private LED trigger called phydev-hw-mode. When
> this trigger is enabled for a LED, the various HW control modes which
> the PHY supports for given LED can be get/set via hw_mode sysfs file.
>
> A PHY driver wishing to utilize this API needs to register the LEDs on
> its own and set the .trigger_type member of LED classdev to
> &phy_hw_led_trig_type. It also needs to implement the methods
> .led_iter_hw_mode, .led_set_hw_mode and .led_get_hw_mode in struct
> phydev.
>
> Signed-off-by: Marek Behún <marek.behun@nic.cz>
> ---
> drivers/net/phy/Kconfig | 9 +++
> drivers/net/phy/Makefile | 1 +
> drivers/net/phy/phy_hw_led_mode.c | 96 +++++++++++++++++++++++++++++++
> include/linux/phy.h | 15 +++++
> 4 files changed, 121 insertions(+)
> create mode 100644 drivers/net/phy/phy_hw_led_mode.c
>
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index dd20c2c27c2f..ffea11f73acd 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -283,6 +283,15 @@ config LED_TRIGGER_PHY
> <Speed in megabits>Mbps OR <Speed in gigabits>Gbps OR link
> for any speed known to the PHY.
>
> +config LED_TRIGGER_PHY_HW
> + bool "Support HW LED control modes"
> + depends on LEDS_TRIGGERS
> + help
> + Many PHYs can control blinking of LEDs connected directly to them.
> + This adds a special LED trigger called phydev-hw-mode. When enabled,
> + the various control modes supported by the PHY on given LED can be
> + chosen via hw_mode sysfs file.
> +
>
> comment "MII PHY device drivers"
>
> diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
> index d84bab489a53..fd0253ab8097 100644
> --- a/drivers/net/phy/Makefile
> +++ b/drivers/net/phy/Makefile
> @@ -20,6 +20,7 @@ endif
> obj-$(CONFIG_MDIO_DEVRES) += mdio_devres.o
> libphy-$(CONFIG_SWPHY) += swphy.o
> libphy-$(CONFIG_LED_TRIGGER_PHY) += phy_led_triggers.o
> +libphy-$(CONFIG_LED_TRIGGER_PHY_HW) += phy_hw_led_mode.o
>
> obj-$(CONFIG_PHYLINK) += phylink.o
> obj-$(CONFIG_PHYLIB) += libphy.o
> diff --git a/drivers/net/phy/phy_hw_led_mode.c b/drivers/net/phy/phy_hw_led_mode.c
> new file mode 100644
> index 000000000000..b4c2f25266a5
> --- /dev/null
> +++ b/drivers/net/phy/phy_hw_led_mode.c
> @@ -0,0 +1,96 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * drivers/net/phy/phy_hw_led_mode.c
> + *
> + * PHY HW LED mode trigger
> + *
> + * Copyright (C) 2020 Marek Behun <marek.behun@nic.cz>
> + */
> +#include <linux/leds.h>
> +#include <linux/phy.h>
> +
> +static void phy_hw_led_trig_deactivate(struct led_classdev *cdev)
> +{
> + struct phy_device *phydev = to_phy_device(cdev->dev->parent);
> + int ret;
> +
> + ret = phydev->drv->led_set_hw_mode(phydev, cdev, NULL);
> + if (ret < 0) {
> + phydev_err(phydev, "failed deactivating HW mode on LED %s\n", cdev->name);
> + return;
> + }
The core holds the phydev mutex when calling into the driver. There
are a few exceptions, but it would be good if all the LED calls into
the driver also held the mutex.
> +}
> +
> +static ssize_t hw_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + struct led_classdev *cdev = led_trigger_get_led(dev);
> + struct phy_device *phydev = to_phy_device(cdev->dev->parent);
> + const char *mode, *cur_mode;
> + void *iter = NULL;
> + int len = 0;
Reverse christmas tree.
> +static int __init phy_led_triggers_init(void)
> +{
> + return led_trigger_register(&phy_hw_led_trig);
> +}
> +
> +module_init(phy_led_triggers_init);
> +
> +static void __exit phy_led_triggers_exit(void)
> +{
> + led_trigger_unregister(&phy_hw_led_trig);
> +}
> +
> +module_exit(phy_led_triggers_exit);
It is a bit of a surprise to find the module init/exit calls here, and
not in phy.c. I think they should be moved.
Andrew
next prev parent reply other threads:[~2020-07-25 16:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-24 16:46 [PATCH RFC leds + net-next v3 0/2] Add support for LEDs on Marvell PHYs Marek Behún
2020-07-24 16:46 ` [PATCH RFC leds + net-next v3 1/2] net: phy: add API for LEDs controlled by PHY HW Marek Behún
2020-07-25 9:21 ` Pavel Machek
2020-07-25 9:37 ` Marek Behun
2020-07-25 16:22 ` Andrew Lunn [this message]
2020-07-24 16:46 ` [PATCH RFC leds + net-next v3 2/2] net: phy: marvell: add support for PHY LEDs via LED class Marek Behún
2020-07-25 9:23 ` Pavel Machek
2020-07-25 9:34 ` Marek Behun
2020-07-25 15:03 ` Andrew Lunn
2020-07-25 17:39 ` Marek Behun
2020-07-25 17:47 ` Andrew Lunn
2020-07-25 17:23 ` Andrew Lunn
2020-07-25 18:02 ` Marek Behun
2020-07-25 18:23 ` Andrew Lunn
2020-07-25 18:48 ` Andrew Lunn
2020-07-25 20:58 ` Marek Behun
2020-08-07 9:11 ` Pavel Machek
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