This adds basic support for LEDs for the max77705 PMIC.
Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
---
Changes for v5:
- use same hardware name in Kconfig and module descriptions
- remove copyrighter owner from module authors
Changes in v4:
- inline BLINK_(ON|OFF) macro
- remove camel case
- drop backwards compatibility(new driver)
- drop module alias
---
MAINTAINERS | 1 +
drivers/leds/Kconfig | 6 ++++++
drivers/leds/Makefile | 1 +
drivers/leds/leds-max77705.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 165 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 4bc9c0da6adb..66a1dd7577c4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14079,6 +14079,7 @@ F: drivers/*/max14577*.c
F: drivers/*/max77686*.c
F: drivers/*/max77693*.c
F: drivers/*/max77705*.c
+F: drivers/leds/leds-max77705.c
F: drivers/clk/clk-max77686.c
F: drivers/extcon/extcon-max14577.c
F: drivers/extcon/extcon-max77693.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index b784bb74a837..a8492623caa4 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -753,6 +753,12 @@ config LEDS_MAX77650
help
LEDs driver for MAX77650 family of PMICs from Maxim Integrated.
+config LEDS_MAX77705
+ tristate "LED support for Maxim MAX77705 PMIC"
+ depends on MFD_MAX77705 && LEDS_CLASS && I2C
+ help
+ LED driver for MAX77705 MFD chip from Maxim Integrated.
+
config LEDS_MAX8997
tristate "LED support for MAX8997 PMIC"
depends on LEDS_CLASS && MFD_MAX8997
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 18afbb5a23ee..096bf244527d 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -60,6 +60,7 @@ 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-$(CONFIG_LEDS_MAX77705) += leds-max77705.o
obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
diff --git a/drivers/leds/leds-max77705.c b/drivers/leds/leds-max77705.c
new file mode 100644
index 000000000000..50af81fb7324
--- /dev/null
+++ b/drivers/leds/leds-max77705.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Based on leds-max77650 driver:
+// Copyright (C) 2018 BayLibre SAS
+// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
+//
+// LED driver for MAXIM 77705 MFD.
+// Copyright (C) 2024 Dzmitry Sankouski <dsankouski@gmail.org>
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/mfd/max77705-private.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MAX77705_LED_NUM_LEDS 4
+#define MAX77705_LED_EN_MASK GENMASK(1, 0)
+#define MAX77705_LED_MAX_BRIGHTNESS 0xff
+
+struct max77705_led {
+ struct led_classdev cdev;
+ struct regmap *regmap;
+ unsigned int en_shift;
+ unsigned int reg_brightness;
+};
+
+static struct max77705_led *max77705_to_led(struct led_classdev *cdev)
+{
+ return container_of(cdev, struct max77705_led, cdev);
+}
+
+static int max77705_rgb_blink(struct led_classdev *cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct max77705_led *led = max77705_to_led(cdev);
+ int value, on_value, off_value;
+
+ on_value = (((*delay_on < 100) ? 0 :
+ (*delay_on < 500) ? *delay_on/100 - 1 :
+ (*delay_on < 3250) ? (*delay_on - 500) / 250 + 4 : 15) << 4);
+ off_value = ((*delay_off < 1) ? 0x00 :
+ (*delay_off < 500) ? 0x01 :
+ (*delay_off < 5000) ? *delay_off / 500 :
+ (*delay_off < 8000) ? (*delay_off - 5000) / 1000 + 10 :
+ (*delay_off < 12000) ? (*delay_off - 8000) / 2000 + 13 : 15);
+ value = on_value | off_value;
+ return regmap_write(led->regmap, MAX77705_RGBLED_REG_LEDBLNK, value);
+}
+
+static int max77705_led_brightness_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct max77705_led *led = max77705_to_led(cdev);
+ int ret;
+ unsigned long blink_default = 0;
+
+ if (brightness == LED_OFF) {
+ // Flash OFF
+ ret = regmap_update_bits(led->regmap,
+ MAX77705_RGBLED_REG_LEDEN,
+ MAX77705_LED_EN_MASK << led->en_shift, 0);
+ max77705_rgb_blink(cdev, &blink_default, &blink_default);
+ } else {
+ // Set current
+ ret = regmap_write(led->regmap,
+ led->reg_brightness, brightness);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(led->regmap,
+ MAX77705_RGBLED_REG_LEDEN, LED_ON << led->en_shift,
+ MAX77705_LED_EN_MASK << led->en_shift);
+ }
+
+ return ret;
+}
+
+static int max77705_led_probe(struct platform_device *pdev)
+{
+ struct fwnode_handle *child;
+ struct max77705_led *leds, *led;
+ struct device *dev;
+ struct regmap *map;
+ int rv, num_leds;
+ u32 reg;
+
+ dev = &pdev->dev;
+
+ leds = devm_kcalloc(dev, sizeof(*leds),
+ MAX77705_LED_NUM_LEDS, GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ map = dev_get_regmap(dev->parent, NULL);
+ if (!map)
+ return -ENODEV;
+
+ num_leds = device_get_child_node_count(dev);
+ if (!num_leds || num_leds > MAX77705_LED_NUM_LEDS)
+ return -ENODEV;
+
+ device_for_each_child_node(dev, child) {
+ struct led_init_data init_data = {};
+
+ rv = fwnode_property_read_u32(child, "reg", ®);
+ if (rv || reg >= MAX77705_LED_NUM_LEDS) {
+ rv = -EINVAL;
+ goto err_node_put;
+ }
+
+ led = &leds[reg];
+ led->regmap = map;
+ led->reg_brightness = MAX77705_RGBLED_REG_LED0BRT + reg;
+ led->en_shift = 2 * reg;
+ led->cdev.brightness_set_blocking = max77705_led_brightness_set;
+ led->cdev.blink_set = max77705_rgb_blink;
+ led->cdev.max_brightness = MAX77705_LED_MAX_BRIGHTNESS;
+
+ init_data.fwnode = child;
+ init_data.devicename = "max77705";
+
+ rv = devm_led_classdev_register_ext(dev, &led->cdev,
+ &init_data);
+ if (rv)
+ goto err_node_put;
+
+ rv = max77705_led_brightness_set(&led->cdev, LED_OFF);
+ if (rv)
+ goto err_node_put;
+ }
+
+ return 0;
+err_node_put:
+ fwnode_handle_put(child);
+ return rv;
+}
+
+static const struct of_device_id max77705_led_of_match[] = {
+ { .compatible = "maxim,max77705-led" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, max77705_led_of_match);
+
+static struct platform_driver max77705_led_driver = {
+ .driver = {
+ .name = "max77705-led",
+ .of_match_table = max77705_led_of_match,
+ },
+ .probe = max77705_led_probe,
+};
+module_platform_driver(max77705_led_driver);
+
+MODULE_DESCRIPTION("Maxim MAX77705 LED driver");
+MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
+MODULE_LICENSE("GPL");
--
2.39.2On Mon, 07 Oct 2024, Dzmitry Sankouski wrote:
> This adds basic support for LEDs for the max77705 PMIC.
>
> Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
>
> ---
> Changes for v5:
> - use same hardware name in Kconfig and module descriptions
> - remove copyrighter owner from module authors
>
> Changes in v4:
> - inline BLINK_(ON|OFF) macro
> - remove camel case
> - drop backwards compatibility(new driver)
> - drop module alias
> ---
> MAINTAINERS | 1 +
> drivers/leds/Kconfig | 6 ++++++
> drivers/leds/Makefile | 1 +
> drivers/leds/leds-max77705.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Lol! How big is your terminal? :)
> 4 files changed, 165 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4bc9c0da6adb..66a1dd7577c4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14079,6 +14079,7 @@ F: drivers/*/max14577*.c
> F: drivers/*/max77686*.c
> F: drivers/*/max77693*.c
> F: drivers/*/max77705*.c
> +F: drivers/leds/leds-max77705.c
Alphabetical?
> F: drivers/clk/clk-max77686.c
> F: drivers/extcon/extcon-max14577.c
> F: drivers/extcon/extcon-max77693.c
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index b784bb74a837..a8492623caa4 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -753,6 +753,12 @@ config LEDS_MAX77650
> help
> LEDs driver for MAX77650 family of PMICs from Maxim Integrated.
>
> +config LEDS_MAX77705
> + tristate "LED support for Maxim MAX77705 PMIC"
> + depends on MFD_MAX77705 && LEDS_CLASS && I2C
If MFD_MAX77705 depends on I2C, you shouldn't need that here.
> + help
> + LED driver for MAX77705 MFD chip from Maxim Integrated.
No such thing as an "MFD chip".
> +
> config LEDS_MAX8997
> tristate "LED support for MAX8997 PMIC"
> depends on LEDS_CLASS && MFD_MAX8997
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 18afbb5a23ee..096bf244527d 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -60,6 +60,7 @@ 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-$(CONFIG_LEDS_MAX77705) += leds-max77705.o
> obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
> obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
> obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
> diff --git a/drivers/leds/leds-max77705.c b/drivers/leds/leds-max77705.c
> new file mode 100644
> index 000000000000..50af81fb7324
> --- /dev/null
> +++ b/drivers/leds/leds-max77705.c
> @@ -0,0 +1,157 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Based on leds-max77650 driver:
> +// Copyright (C) 2018 BayLibre SAS
> +// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
You don't need to do that.
> +//
> +// LED driver for MAXIM 77705 MFD.
Remove MFD from everywhere.
> +// Copyright (C) 2024 Dzmitry Sankouski <dsankouski@gmail.org>
Only the SPDX in C++ please.
> +#include <linux/i2c.h>
> +#include <linux/leds.h>
> +#include <linux/mfd/max77705-private.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define MAX77705_LED_NUM_LEDS 4
> +#define MAX77705_LED_EN_MASK GENMASK(1, 0)
> +#define MAX77705_LED_MAX_BRIGHTNESS 0xff
> +
> +struct max77705_led {
> + struct led_classdev cdev;
> + struct regmap *regmap;
> + unsigned int en_shift;
> + unsigned int reg_brightness;
> +};
> +
> +static struct max77705_led *max77705_to_led(struct led_classdev *cdev)
> +{
> + return container_of(cdev, struct max77705_led, cdev);
> +}
> +
> +static int max77705_rgb_blink(struct led_classdev *cdev,
> + unsigned long *delay_on,
> + unsigned long *delay_off)
> +{
> + struct max77705_led *led = max77705_to_led(cdev);
> + int value, on_value, off_value;
> +
> + on_value = (((*delay_on < 100) ? 0 :
> + (*delay_on < 500) ? *delay_on/100 - 1 :
> + (*delay_on < 3250) ? (*delay_on - 500) / 250 + 4 : 15) << 4);
> + off_value = ((*delay_off < 1) ? 0x00 :
> + (*delay_off < 500) ? 0x01 :
> + (*delay_off < 5000) ? *delay_off / 500 :
> + (*delay_off < 8000) ? (*delay_off - 5000) / 1000 + 10 :
> + (*delay_off < 12000) ? (*delay_off - 8000) / 2000 + 13 : 15);
These nested ternary are pretty miserable. Please break them out.
Also all of these magic numbers probably need defining so the maths
becomes easier to follow for humans.
> + value = on_value | off_value;
> + return regmap_write(led->regmap, MAX77705_RGBLED_REG_LEDBLNK, value);
> +}
> +
> +static int max77705_led_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct max77705_led *led = max77705_to_led(cdev);
> + int ret;
Pop the ret on the bottom, if no other reason than for my OCD!
> + unsigned long blink_default = 0;
> +
> + if (brightness == LED_OFF) {
> + // Flash OFF
No C++ comments please.
> + ret = regmap_update_bits(led->regmap,
> + MAX77705_RGBLED_REG_LEDEN,
> + MAX77705_LED_EN_MASK << led->en_shift, 0);
> + max77705_rgb_blink(cdev, &blink_default, &blink_default);
> + } else {
> + // Set current
> + ret = regmap_write(led->regmap,
> + led->reg_brightness, brightness);
Line wrap at 100-chars.
> + if (ret < 0)
> + return ret;
> +
> + ret = regmap_update_bits(led->regmap,
> + MAX77705_RGBLED_REG_LEDEN, LED_ON << led->en_shift,
> + MAX77705_LED_EN_MASK << led->en_shift);
> + }
> +
> + return ret;
> +}
> +
> +static int max77705_led_probe(struct platform_device *pdev)
> +{
> + struct fwnode_handle *child;
> + struct max77705_led *leds, *led;
> + struct device *dev;
> + struct regmap *map;
s/map/regmap/
> + int rv, num_leds;
What's rv? If it's "return value", then please just use ret.
> + u32 reg;
> +
> + dev = &pdev->dev;
Do this during the declaration
> + leds = devm_kcalloc(dev, sizeof(*leds),
> + MAX77705_LED_NUM_LEDS, GFP_KERNEL);
> + if (!leds)
> + return -ENOMEM;
> +
> + map = dev_get_regmap(dev->parent, NULL);
> + if (!map)
> + return -ENODEV;
> +
> + num_leds = device_get_child_node_count(dev);
> + if (!num_leds || num_leds > MAX77705_LED_NUM_LEDS)
num_leds < 0
> + return -ENODEV;
> +
> + device_for_each_child_node(dev, child) {
If you use the _scoped version, you can drop the gotos.
> + struct led_init_data init_data = {};
> +
> + rv = fwnode_property_read_u32(child, "reg", ®);
> + if (rv || reg >= MAX77705_LED_NUM_LEDS) {
> + rv = -EINVAL;
> + goto err_node_put;
> + }
> +
> + led = &leds[reg];
> + led->regmap = map;
> + led->reg_brightness = MAX77705_RGBLED_REG_LED0BRT + reg;
> + led->en_shift = 2 * reg;
Why 2?
> + led->cdev.brightness_set_blocking = max77705_led_brightness_set;
> + led->cdev.blink_set = max77705_rgb_blink;
> + led->cdev.max_brightness = MAX77705_LED_MAX_BRIGHTNESS;
> +
> + init_data.fwnode = child;
> + init_data.devicename = "max77705";
You don't want to use the label as the devicename?
https://github.com/torvalds/linux/blob/master/drivers/leds/led-core.c#L526
> +
> + rv = devm_led_classdev_register_ext(dev, &led->cdev,
> + &init_data);
> + if (rv)
> + goto err_node_put;
> +
> + rv = max77705_led_brightness_set(&led->cdev, LED_OFF);
> + if (rv)
> + goto err_node_put;
> + }
> +
> + return 0;
'\n' here.
> +err_node_put:
> + fwnode_handle_put(child);
> + return rv;
> +}
> +
> +static const struct of_device_id max77705_led_of_match[] = {
> + { .compatible = "maxim,max77705-led" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, max77705_led_of_match);
> +
> +static struct platform_driver max77705_led_driver = {
> + .driver = {
> + .name = "max77705-led",
> + .of_match_table = max77705_led_of_match,
> + },
> + .probe = max77705_led_probe,
> +};
> +module_platform_driver(max77705_led_driver);
> +
> +MODULE_DESCRIPTION("Maxim MAX77705 LED driver");
> +MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
> +MODULE_LICENSE("GPL");
>
> --
> 2.39.2
>
--
Lee Jones [李琼斯]
(...)
> > drivers/leds/leds-max77705.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
> Lol! How big is your terminal? :)
>
Dunno actually, this was generated by b4
(...)
> No C++ comments please.
>
This conflicts with https://patchwork.kernel.org/comment/25898728/
> > + ret = regmap_update_bits(led->regmap,
> > + MAX77705_RGBLED_REG_LEDEN,
> > + MAX77705_LED_EN_MASK << led->en_shift, 0);
> > + max77705_rgb_blink(cdev, &blink_default, &blink_default);
> > + } else {
> > + // Set current
> > + ret = regmap_write(led->regmap,
> > + led->reg_brightness, brightness);
>
> Line wrap at 100-chars.
>
From coding-style.rst:
`The preferred limit on the length of a single line is 80 columns.`
I only exceed 80 chars, when there's no good wrapping.
--
Best regards,
Dzmitry
On Tue, 22 Oct 2024, Dzmitry Sankouski wrote:
> (...)
> > > drivers/leds/leds-max77705.c | 157 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >
> > Lol! How big is your terminal? :)
> >
>
> Dunno actually, this was generated by b4
>
> (...)
>
>
> > No C++ comments please.
> >
>
> This conflicts with https://patchwork.kernel.org/comment/25898728/
a) That's just for the header.
b) That's a different subsystem and Mark's choice.
> > > + ret = regmap_update_bits(led->regmap,
> > > + MAX77705_RGBLED_REG_LEDEN,
> > > + MAX77705_LED_EN_MASK << led->en_shift, 0);
> > > + max77705_rgb_blink(cdev, &blink_default, &blink_default);
> > > + } else {
> > > + // Set current
> > > + ret = regmap_write(led->regmap,
> > > + led->reg_brightness, brightness);
> >
> > Line wrap at 100-chars.
> >
>
> From coding-style.rst:
> `The preferred limit on the length of a single line is 80 columns.`
> I only exceed 80 chars, when there's no good wrapping.
a) This is old guidance
b) A lot of your lines already break the 80-char rule.
--
Lee Jones [李琼斯]
© 2016 - 2026 Red Hat, Inc.