leds: max5970: Add support for max5970

The MAX5970 is hot swap controller and has 4 indication LED.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20231123132803.1107174-1-naresh.solanki@9elements.com
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e7697a8..bfa11e7 100644 (file)
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -648,6 +648,17 @@ 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 b82a538..ce07dc2 100644 (file)
--- 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 (file)
index 0000000..456a16a
--- /dev/null
+++ b/drivers/leds/leds-max5970.c
@@ -0,0 +1,109 @@
+// 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@9elements.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, *child;
+       struct max5970_led *ddata;
+       int ret = -ENODEV, num_leds = 0;
+
+       regmap = dev_get_regmap(pdev->dev.parent, NULL);
+       if (!regmap)
+               return -ENODEV;
+
+       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", &reg))
+                       continue;
+
+               if (reg >= MAX5970_NUM_LEDS) {
+                       dev_err(dev, "invalid LED (%u >= %d)\n", reg, MAX5970_NUM_LEDS);
+                       continue;
+               }
+
+               ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
+               if (!ddata) {
+                       of_node_put(child);
+                       return -ENOMEM;
+               }
+
+               ddata->index = reg;
+               ddata->regmap = regmap;
+               ddata->dev = dev;
+
+               if (of_property_read_string(child, "label", &ddata->cdev.name))
+                       ddata->cdev.name = child->name;
+
+               ddata->cdev.max_brightness = 1;
+               ddata->cdev.brightness_set_blocking = max5970_led_set_brightness;
+               ddata->cdev.default_trigger = "none";
+
+               ret = devm_led_classdev_register(dev, &ddata->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@9elements.com>");
+MODULE_AUTHOR("Naresh Solanki <Naresh.Solanki@9elements.com>");
+MODULE_DESCRIPTION("MAX5970_hot-swap controller LED driver");
+MODULE_LICENSE("GPL");