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Message-Id: <20230322124316.2147143-2-Naresh.Solanki@9elements.com>
Date: Wed, 22 Mar 2023 13:43:16 +0100
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Lee Jones <lee@...nel.org>, Pavel Machek <pavel@....cz>
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
Naresh Solanki <Naresh.Solanki@...ements.com>,
linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: [PATCH 2/2] leds: max597x: Add support for max597x
From: Patrick Rudolph <patrick.rudolph@...ements.com>
max597x is hot swap controller with indication led support.
This driver uses DT property to configure led during boot time &
also provide the led control in sysfs.
Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
drivers/leds/Kconfig | 11 +++
drivers/leds/Makefile | 1 +
drivers/leds/leds-max597x.c | 132 ++++++++++++++++++++++++++++++++++++
3 files changed, 144 insertions(+)
create mode 100644 drivers/leds/leds-max597x.c
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 9dbce09eabac..ba184a3f736e 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -590,6 +590,17 @@ config LEDS_ADP5520
To compile this driver as a module, choose M here: the module will
be called leds-adp5520.
+config LEDS_MAX597X
+ tristate "LED Support for Maxim 597x"
+ depends on LEDS_CLASS
+ depends on MFD_MAX597X
+ help
+ This option enables support for the Maxim 597x smart switch indication LEDs
+ via the I2C bus.
+
+ To compile this driver as a module, choose M here: the module will
+ be called max597x-led.
+
config LEDS_MC13783
tristate "LED Support for MC13XXX PMIC"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index d30395d11fd8..da1192e40268 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -53,6 +53,7 @@ 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-$(CONFIG_LEDS_MAX597X) += leds-max597x.o
obj-$(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-max597x.c b/drivers/leds/leds-max597x.c
new file mode 100644
index 000000000000..e2844202a35b
--- /dev/null
+++ b/drivers/leds/leds-max597x.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device driver for regulators in MAX5970 and MAX5978 IC
+ *
+ * Copyright (c) 2022 9elements GmbH
+ *
+ * Author: Patrick Rudolph <patrick.rudolph@...ements.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/mfd/max597x.h>
+#include <linux/regmap.h>
+#include <linux/version.h>
+#include <linux/platform_device.h>
+
+#define ldev_to_maxled(c) container_of(c, struct max597x_led, led)
+
+struct max597x_led {
+ struct regmap *regmap;
+ struct led_classdev led;
+ unsigned int index;
+};
+
+static int max597x_led_set_brightness(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct max597x_led *led = ldev_to_maxled(cdev);
+ int ret;
+
+ if (!led || !led->regmap)
+ return -ENODEV;
+
+ ret = regmap_update_bits(led->regmap, MAX5970_REG_LED_FLASH,
+ 1 << led->index, ~brightness << led->index);
+ if (ret < 0)
+ dev_err(cdev->dev, "failed to set brightness %d\n", ret);
+ return ret;
+}
+
+static int max597x_setup_led(struct device *dev, struct regmap *regmap, struct device_node *nc,
+ u32 reg)
+{
+ struct max597x_led *led;
+ const char *state;
+ int ret = 0;
+
+ led = devm_kzalloc(dev, sizeof(struct max597x_led),
+ GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ if (of_property_read_string(nc, "label", &led->led.name))
+ led->led.name = nc->name;
+
+ led->led.max_brightness = 1;
+ led->led.brightness_set_blocking = max597x_led_set_brightness;
+ led->led.default_trigger = "none";
+ led->index = reg;
+ led->regmap = regmap;
+ ret = led_classdev_register(dev, &led->led);
+ if (ret) {
+ dev_err(dev, "Error in initializing led %s", led->led.name);
+ devm_kfree(dev, led);
+ return ret;
+ }
+
+ if (!of_property_read_string(nc, "default-state", &state)) {
+ if (!strcmp(state, "on")) {
+ led->led.brightness = 1;
+ led_set_brightness(&led->led, led->led.brightness);
+ }
+ }
+ return 0;
+}
+
+static int max597x_led_probe(struct platform_device *pdev)
+{
+ struct device_node *np = dev_of_node(pdev->dev.parent);
+ struct i2c_client *i2c = to_i2c_client(pdev->dev.parent);
+ struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ struct device_node *led_node;
+ struct device_node *child;
+ int ret = 0;
+
+ 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 >= MAX597X_NUM_LEDS) {
+ dev_err(&i2c->dev, "invalid LED (%u >= %d)\n", reg,
+ MAX597X_NUM_LEDS);
+ continue;
+ }
+
+ ret = max597x_setup_led(&i2c->dev, regmap, child, reg);
+ if (ret < 0) {
+ of_node_put(child);
+ return ret;
+ }
+ }
+
+ return ret;
+}
+
+static struct platform_driver max597x_led_driver = {
+ .driver = {
+ .name = "max597x-led",
+ },
+ .probe = max597x_led_probe,
+};
+
+module_platform_driver(max597x_led_driver);
+
+MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@...ements.com>");
+MODULE_DESCRIPTION("MAX5970_hot-swap controller driver");
+MODULE_LICENSE("GPL");
--
2.39.1
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