From: Jacek Anaszewski <jacek.anaszewski@gmail.com>
To: Dan Murphy <dmurphy@ti.com>, pavel@ucw.cz, robh+dt@kernel.org
Cc: devicetree@vger.kernel.org, linux-leds@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 6/9] leds: multicolor: Introduce a multicolor class definition
Date: Thu, 20 Jun 2019 18:10:26 +0200 [thread overview]
Message-ID: <2f91bd2b-1d69-c9c7-c20b-a7396c9e1ecd@gmail.com> (raw)
In-Reply-To: <20190523190820.29375-7-dmurphy@ti.com>
Hi Dan,
Thank you for the v5.
I will confine myself to commenting only some parts since
the rest will undergo rework due to removal of sync API.
On 5/23/19 9:08 PM, Dan Murphy wrote:
> Introduce a multicolor class that groups colored LEDs
> within a LED node.
>
> The framework allows for dynamically setting individual LEDs
> or setting brightness levels of LEDs and updating them virtually
> simultaneously.
>
> Signed-off-by: Dan Murphy <dmurphy@ti.com>
> ---
> drivers/leds/Kconfig | 10 +
> drivers/leds/Makefile | 1 +
> drivers/leds/led-class-multicolor.c | 421 +++++++++++++++++++++++++++
> include/linux/led-class-multicolor.h | 95 ++++++
> 4 files changed, 527 insertions(+)
> create mode 100644 drivers/leds/led-class-multicolor.c
> create mode 100644 include/linux/led-class-multicolor.h
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 0414adebb177..0696a13c9527 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -29,6 +29,16 @@ config LEDS_CLASS_FLASH
> for the flash related features of a LED device. It can be built
> as a module.
>
> +config LEDS_CLASS_MULTI_COLOR
> + tristate "LED Mulit Color LED Class Support"
> + depends on LEDS_CLASS
> + help
> + This option enables the multicolor LED sysfs class in /sys/class/leds.
> + It wraps LED Class and adds multicolor LED specific sysfs attributes
> + and kernel internal API to it. You'll need this to provide support
> + for multicolor LEDs that are grouped together. This class is not
> + intended for single color LEDs. It can be built as a module.
extra whitespace:
s/ It can/It can/
[...]
> +
> +static int multicolor_set_brightness(struct led_classdev *led_cdev,
> + enum led_brightness brightness)
> +{
> + struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
> + struct led_classdev_mc_data *data = mcled_cdev->data;
> + struct led_multicolor_ops *ops = mcled_cdev->ops;
> + struct led_classdev_mc_priv *priv;
> + unsigned long state = brightness;
> + int adj_value;
> + ssize_t ret = -EINVAL;
> +
> + mutex_lock(&led_cdev->led_access);
> +
> + if (ops->set_module_brightness) {
> + ret = ops->set_module_brightness(mcled_cdev, state);
> + goto unlock;
> + }
> +
> + list_for_each_entry(priv, &data->color_list, list) {
> + if (state && priv->brightness && priv->max_brightness) {
> + adj_value = state * ((priv->brightness * 100) / priv->max_brightness);
> + adj_value = adj_value / 100;
Why the multiplication an then division by 100? And priv->max_brightness
stays unaltered? This changes the proportions. My python script works
just fine without those.
> + } else
> + adj_value = LED_OFF;
> +
> + ret = ops->set_color_brightness(priv->mcled_cdev,
> + priv->color_id, adj_value);
> + if (ret < 0)
> + goto unlock;
> + }
> +
> +unlock:
> + mutex_unlock(&led_cdev->led_access);
> + return ret;
> +}
[...]
> +int led_classdev_multicolor_register_ext(struct device *parent,
> + struct led_classdev_mc *mcled_cdev,
> + struct led_init_data *init_data)
> +{
> + struct led_classdev *led_cdev;
> + struct led_multicolor_ops *ops;
> + struct led_classdev_mc_data *data;
> + int ret;
> + int i;
> +
> + if (!mcled_cdev)
> + return -EINVAL;
> +
> + ops = mcled_cdev->ops;
> + if (!ops || !ops->set_color_brightness)
> + return -EINVAL;
> +
> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + mcled_cdev->data = data;
> + led_cdev = &mcled_cdev->led_cdev;
> +
> + if (led_cdev->brightness_set_blocking)
> + led_cdev->brightness_set_blocking = multicolor_set_brightness;
This is weird. In leds-lp50xx.c you don't initialize
brightness_set_blocking and this still works?
I believe this is kind of omission.
And it is not reasonable to just override driver supplied op with
generic one just like that.
I propose to initialize brightness_set or brightness_set_blocking
op as we used to do it for monochrome LEDs. Those function(s) on
driver side will either use device's hardware support for setting
color lightness, or will call a generic function provided by
LED multi color class for calculating intensities of all colors
it comprises in the cluster.
I know this is different to what we've discussed on IRC, but now
it looks for me the most reasonable way to go.
> + INIT_LIST_HEAD(&data->color_list);
> +
> + /* Register led class device */
> + ret = led_classdev_register_ext(parent, led_cdev, init_data);
> + if (ret)
> + return ret;
> +
> + ret = led_multicolor_init_color_dir(data, mcled_cdev);
> + if (ret)
> + return ret;
> +
> + /* Select the sysfs attributes to be created for the device */
> + for (i = 0; i < mcled_cdev->num_leds; i++) {
> + ret = led_multicolor_init_color(data, mcled_cdev,
> + mcled_cdev->available_colors[i]);
> + if (ret)
> + break;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(led_classdev_multicolor_register_ext);
> +
> +void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev)
> +{
> + if (!mcled_cdev)
> + return;
> +
> + led_classdev_unregister(&mcled_cdev->led_cdev);
> +}
> +EXPORT_SYMBOL_GPL(led_classdev_multicolor_unregister);
> +
> +static void devm_led_classdev_multicolor_release(struct device *dev, void *res)
> +{
> + led_classdev_multicolor_unregister(*(struct led_classdev_mc **)res);
> +}
> +
> +/**
> + * devm_of_led_classdev_register - resource managed led_classdev_register()
> + *
> + * @parent: parent of LED device
> + * @led_cdev: the led_classdev structure for this device.
> + */
> +int devm_led_classdev_multicolor_register(struct device *parent,
> + struct led_classdev_mc *mcled_cdev)
> +{
> + struct led_classdev_mc **dr;
> + int ret;
> +
> + dr = devres_alloc(devm_led_classdev_multicolor_release,
> + sizeof(*dr), GFP_KERNEL);
> + if (!dr)
> + return -ENOMEM;
> +
> + ret = led_classdev_multicolor_register(parent, mcled_cdev);
> + if (ret) {
> + devres_free(dr);
> + return ret;
> + }
> +
> + *dr = mcled_cdev;
> + devres_add(parent, dr);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_register);
> +
> +static int devm_led_classdev_multicolor_match(struct device *dev,
> + void *res, void *data)
> +{
> + struct mcled_cdev **p = res;
> +
> + if (WARN_ON(!p || !*p))
> + return 0;
> +
> + return *p == data;
> +}
> +
> +/**
> + * devm_led_classdev_multicolor_unregister() - resource managed
> + * led_classdev_multicolor_unregister()
> + * @parent: The device to unregister.
> + * @mcled_cdev: the led_classdev_mc structure for this device.
> + */
> +void devm_led_classdev_multicolor_unregister(struct device *dev,
> + struct led_classdev_mc *mcled_cdev)
> +{
> + WARN_ON(devres_release(dev,
> + devm_led_classdev_multicolor_release,
> + devm_led_classdev_multicolor_match, mcled_cdev));
> +}
> +EXPORT_SYMBOL_GPL(devm_led_classdev_multicolor_unregister);
> +
> +MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
> +MODULE_DESCRIPTION("Multi Color LED class interface");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/led-class-multicolor.h b/include/linux/led-class-multicolor.h
> new file mode 100644
> index 000000000000..f9e71d984b03
> --- /dev/null
> +++ b/include/linux/led-class-multicolor.h
> @@ -0,0 +1,95 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/* LED Multicolor class interface
> + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
> + */
Let's have C++ comment style also here.
> +#ifndef __LINUX_MULTICOLOR_LEDS_H_INCLUDED
> +#define __LINUX_MULTICOLOR_LEDS_H_INCLUDED
> +
> +#include <linux/leds.h>
> +#include <dt-bindings/leds/common.h>
[...]
--
Best regards,
Jacek Anaszewski
next prev parent reply other threads:[~2019-06-20 16:10 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 19:08 [PATCH v3 0/9] Multicolor Framework update Dan Murphy
2019-05-23 19:08 ` [PATCH v3 1/9] leds: multicolor: Add sysfs interface definition Dan Murphy
2019-05-27 10:33 ` Pavel Machek
2019-05-28 0:45 ` Dan Murphy
2019-05-28 11:34 ` Dan Murphy
2019-05-30 19:40 ` Pavel Machek
2019-05-30 20:43 ` Dan Murphy
2019-05-27 20:00 ` Jacek Anaszewski
2019-05-28 17:32 ` Dan Murphy
2019-05-28 17:44 ` Jacek Anaszewski
2019-05-28 18:19 ` Dan Murphy
2019-05-28 18:29 ` Jacek Anaszewski
2019-05-30 14:30 ` Dan Murphy
2019-05-23 19:08 ` [PATCH v3 2/9] dt: bindings: Add multicolor class dt bindings documention Dan Murphy
2019-06-14 17:00 ` Rob Herring
2019-06-14 17:18 ` Dan Murphy
2019-06-18 15:36 ` Rob Herring
2019-06-18 18:19 ` Jacek Anaszewski
2019-06-18 18:57 ` Rob Herring
2019-05-23 19:08 ` [PATCH v3 3/9] documention: leds: Add multicolor class documentation Dan Murphy
2019-05-23 19:08 ` [PATCH v3 4/9] dt-bindings: leds: Add multicolor ID to the color ID list Dan Murphy
2019-06-14 17:00 ` Rob Herring
2019-05-23 19:08 ` [PATCH v3 5/9] " Dan Murphy
2019-05-23 19:08 ` [PATCH v3 6/9] leds: multicolor: Introduce a multicolor class definition Dan Murphy
2019-06-20 16:10 ` Jacek Anaszewski [this message]
2019-06-20 20:06 ` Dan Murphy
2019-06-20 21:42 ` Jacek Anaszewski
2019-05-23 19:08 ` [PATCH v3 7/9] dt: bindings: lp50xx: Introduce the lp50xx family of RGB drivers Dan Murphy
2019-05-24 20:50 ` Rob Herring
2019-05-28 0:47 ` Dan Murphy
2019-06-11 21:51 ` Rob Herring
2019-05-23 19:08 ` [PATCH v3 8/9] leds: lp50xx: Add the LP50XX family of the RGB LED driver Dan Murphy
2019-05-23 19:08 ` [PATCH v3 9/9] leds: Update the lp55xx to use the multi color framework Dan Murphy
2019-06-14 7:02 ` [PATCH v3 0/9] Multicolor Framework update Alexander Dahl
2019-06-14 14:23 ` Dan Murphy
2019-06-16 15:49 ` Pavel Machek
2019-06-17 13:47 ` Dan Murphy
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