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Date: Thu, 24 Aug 2023 12:55:21 +0200
From: Patrick Rudolph <patrick.rudolph@...ements.com>
To: Naresh Solanki <naresh.solanki@...ements.com>
Cc: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v2] leds: max5970: Add support for max5970
On Thu, Aug 24, 2023 at 12:49 PM Naresh Solanki
<naresh.solanki@...ements.com> wrote:
>
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>
> The MAX5970 is hot swap controller and has 4 indication LED.
>
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
> Changes in V2:
> - Add of_node_put before return.
> - Code cleanup
> - Refactor code & remove max5970_setup_led function.
> ---
> drivers/leds/Kconfig | 11 ++++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-max5970.c | 110 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 122 insertions(+)
> create mode 100644 drivers/leds/leds-max5970.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index b92208eccdea..03ef527cc545 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -637,6 +637,17 @@ config LEDS_ADP5520
> To compile this driver as a module, choose M here: the module will
> be called leds-adp5520.
>
> +config LEDS_MAX5970
> + tristate "LED Support for Maxim 5970"
> + depends on LEDS_CLASS
> + depends on MFD_MAX5970
> + help
> + This option enables support for the Maxim MAX5970 & MAX5978 smart
> + switch indication LEDs via the I2C bus.
> +
> + To compile this driver as a module, choose M here: the module will
> + be called leds-max5970.
> +
> config LEDS_MC13783
> tristate "LED Support for MC13XXX PMIC"
> depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index d7348e8bc019..6eaee0a753c6 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -56,6 +56,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o
> obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o
> obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o
> obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
> +obj-$(CONFIG_LEDS_MAX5970) += leds-max5970.o
> obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o
> obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
> obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
> diff --git a/drivers/leds/leds-max5970.c b/drivers/leds/leds-max5970.c
> new file mode 100644
> index 000000000000..79277d47e1bc
> --- /dev/null
> +++ b/drivers/leds/leds-max5970.c
> @@ -0,0 +1,110 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device driver for leds in MAX5970 and MAX5978 IC
> + *
> + * Copyright (c) 2022 9elements GmbH
> + *
> + * Author: Patrick Rudolph <patrick.rudolph@...ements.com>
> + */
> +
> +#include <linux/leds.h>
> +#include <linux/mfd/max5970.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define ldev_to_maxled(c) container_of(c, struct max5970_led, cdev)
> +
> +struct max5970_led {
> + struct device *dev;
> + struct regmap *regmap;
> + struct led_classdev cdev;
> + unsigned int index;
> +};
> +
> +static int max5970_led_set_brightness(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct max5970_led *ddata = ldev_to_maxled(cdev);
> + int ret, val;
> +
> + /* Set/clear corresponding bit for given led index */
> + val = !brightness ? BIT(ddata->index) : 0;
> +
> + ret = regmap_update_bits(ddata->regmap, MAX5970_REG_LED_FLASH, BIT(ddata->index), val);
> + if (ret < 0)
> + dev_err(cdev->dev, "failed to set brightness %d", ret);
> +
> + return ret;
> +}
> +
> +static int max5970_led_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev_of_node(dev->parent);
> + struct regmap *regmap;
> + struct device_node *led_node;
> + struct device_node *child;
> + struct max5970_led *ddata[MAX5970_NUM_LEDS];
> + int ret = -ENODEV, num_leds = 0;
> +
> + regmap = dev_get_regmap(pdev->dev.parent, NULL);
> + if (!regmap)
> + return -EPROBE_DEFER;
> +
> + led_node = of_get_child_by_name(np, "leds");
> + if (!led_node)
> + return -ENODEV;
> +
> + for_each_available_child_of_node(led_node, child) {
> + u32 reg;
> +
> + if (of_property_read_u32(child, "reg", ®))
> + continue;
> +
> + if (reg >= MAX5970_NUM_LEDS) {
> + dev_err(dev, "invalid LED (%u >= %d)\n", reg, MAX5970_NUM_LEDS);
> + continue;
> + }
> +
> + ddata[num_leds] = devm_kzalloc(dev, sizeof(struct max5970_led), GFP_KERNEL);
> + if (!ddata[num_leds]) {
> + of_node_put(child);
> + return -ENOMEM;
> + }
This overflows if more than MAX5970_NUM_LEDS child nodes are present
in the node.
Better drop the array as you don't use it any more.
> +
> + ddata[num_leds]->index = reg;
> + ddata[num_leds]->regmap = regmap;
> + ddata[num_leds]->dev = dev;
> +
> + if (of_property_read_string(child, "label", &ddata[num_leds]->cdev.name))
> + ddata[num_leds]->cdev.name = child->name;
> +
> + ddata[num_leds]->cdev.max_brightness = 1;
> + ddata[num_leds]->cdev.brightness_set_blocking = max5970_led_set_brightness;
> + ddata[num_leds]->cdev.default_trigger = "none";
> +
> + ret = devm_led_classdev_register(ddata[num_leds]->dev, &ddata[num_leds]->cdev);
> + if (ret < 0) {
> + of_node_put(child);
> + dev_err(dev, "Failed to initialize LED %u\n", reg);
> + return ret;
> + }
> + num_leds++;
> + }
> +
> + return ret;
> +}
> +
> +static struct platform_driver max5970_led_driver = {
> + .driver = {
> + .name = "max5970-led",
> + },
> + .probe = max5970_led_probe,
> +};
> +
> +module_platform_driver(max5970_led_driver);
> +MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@...ements.com>");
> +MODULE_AUTHOR("Naresh Solanki <Naresh.Solanki@...ements.com>");
> +MODULE_DESCRIPTION("MAX5970_hot-swap controller LED driver");
> +MODULE_LICENSE("GPL");
>
> base-commit: baca986e1f2c31f8e4b2a6d99d47c3bc844033e8
> --
> 2.41.0
>
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