help
This option enables support for pwm driven LEDs
-config LEDS_PWM_MULTICOLOR
- tristate "PWM driven multi-color LED Support"
- depends on LEDS_CLASS_MULTICOLOR
- depends on PWM
- help
- This option enables support for PWM driven monochrome LEDs that are
- grouped into multicolor LEDs.
-
- To compile this driver as a module, choose M here: the module
- will be called leds-pwm-multicolor.
-
config LEDS_REGULATOR
tristate "REGULATOR driven LED support"
depends on LEDS_CLASS
obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o
obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o
obj-$(CONFIG_LEDS_PWM) += leds-pwm.o
-obj-$(CONFIG_LEDS_PWM_MULTICOLOR) += leds-pwm-multicolor.o
obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o
obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * PWM-based multi-color LED control
- *
- * Copyright 2022 Sven Schwermer <sven.schwermer@disruptive-technologies.com>
- */
-
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/led-class-multicolor.h>
-#include <linux/leds.h>
-#include <linux/mod_devicetable.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/platform_device.h>
-#include <linux/property.h>
-#include <linux/pwm.h>
-
-struct pwm_led {
- struct pwm_device *pwm;
- struct pwm_state state;
-};
-
-struct pwm_mc_led {
- struct led_classdev_mc mc_cdev;
- struct mutex lock;
- struct pwm_led leds[];
-};
-
-static int led_pwm_mc_set(struct led_classdev *cdev,
- enum led_brightness brightness)
-{
- struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev);
- struct pwm_mc_led *priv = container_of(mc_cdev, struct pwm_mc_led, mc_cdev);
- unsigned long long duty;
- int ret = 0;
- int i;
-
- led_mc_calc_color_components(mc_cdev, brightness);
-
- mutex_lock(&priv->lock);
-
- for (i = 0; i < mc_cdev->num_colors; i++) {
- duty = priv->leds[i].state.period;
- duty *= mc_cdev->subled_info[i].brightness;
- do_div(duty, cdev->max_brightness);
-
- priv->leds[i].state.duty_cycle = duty;
- priv->leds[i].state.enabled = duty > 0;
- ret = pwm_apply_state(priv->leds[i].pwm,
- &priv->leds[i].state);
- if (ret)
- break;
- }
-
- mutex_unlock(&priv->lock);
-
- return ret;
-}
-
-static int iterate_subleds(struct device *dev, struct pwm_mc_led *priv,
- struct fwnode_handle *mcnode)
-{
- struct mc_subled *subled = priv->mc_cdev.subled_info;
- struct fwnode_handle *fwnode;
- struct pwm_led *pwmled;
- u32 color;
- int ret;
-
- /* iterate over the nodes inside the multi-led node */
- fwnode_for_each_child_node(mcnode, fwnode) {
- pwmled = &priv->leds[priv->mc_cdev.num_colors];
- pwmled->pwm = devm_fwnode_pwm_get(dev, fwnode, NULL);
- if (IS_ERR(pwmled->pwm)) {
- ret = PTR_ERR(pwmled->pwm);
- dev_err(dev, "unable to request PWM: %d\n", ret);
- goto release_fwnode;
- }
- pwm_init_state(pwmled->pwm, &pwmled->state);
-
- ret = fwnode_property_read_u32(fwnode, "color", &color);
- if (ret) {
- dev_err(dev, "cannot read color: %d\n", ret);
- goto release_fwnode;
- }
-
- subled[priv->mc_cdev.num_colors].color_index = color;
- priv->mc_cdev.num_colors++;
- }
-
- return 0;
-
-release_fwnode:
- fwnode_handle_put(fwnode);
- return ret;
-}
-
-static int led_pwm_mc_probe(struct platform_device *pdev)
-{
- struct fwnode_handle *mcnode, *fwnode;
- struct led_init_data init_data = {};
- struct led_classdev *cdev;
- struct mc_subled *subled;
- struct pwm_mc_led *priv;
- int count = 0;
- int ret = 0;
-
- mcnode = device_get_named_child_node(&pdev->dev, "multi-led");
- if (!mcnode)
- return dev_err_probe(&pdev->dev, -ENODEV,
- "expected multi-led node\n");
-
- /* count the nodes inside the multi-led node */
- fwnode_for_each_child_node(mcnode, fwnode)
- count++;
-
- priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, count),
- GFP_KERNEL);
- if (!priv) {
- ret = -ENOMEM;
- goto release_mcnode;
- }
- mutex_init(&priv->lock);
-
- subled = devm_kcalloc(&pdev->dev, count, sizeof(*subled), GFP_KERNEL);
- if (!subled) {
- ret = -ENOMEM;
- goto release_mcnode;
- }
- priv->mc_cdev.subled_info = subled;
-
- /* init the multicolor's LED class device */
- cdev = &priv->mc_cdev.led_cdev;
- fwnode_property_read_u32(mcnode, "max-brightness",
- &cdev->max_brightness);
- cdev->flags = LED_CORE_SUSPENDRESUME;
- cdev->brightness_set_blocking = led_pwm_mc_set;
-
- ret = iterate_subleds(&pdev->dev, priv, mcnode);
- if (ret)
- goto release_mcnode;
-
- init_data.fwnode = mcnode;
- ret = devm_led_classdev_multicolor_register_ext(&pdev->dev,
- &priv->mc_cdev,
- &init_data);
- if (ret) {
- dev_err(&pdev->dev,
- "failed to register multicolor PWM led for %s: %d\n",
- cdev->name, ret);
- goto release_mcnode;
- }
-
- ret = led_pwm_mc_set(cdev, cdev->brightness);
- if (ret)
- return dev_err_probe(&pdev->dev, ret,
- "failed to set led PWM value for %s: %d",
- cdev->name, ret);
-
- platform_set_drvdata(pdev, priv);
- return 0;
-
-release_mcnode:
- fwnode_handle_put(mcnode);
- return ret;
-}
-
-static const struct of_device_id of_pwm_leds_mc_match[] = {
- { .compatible = "pwm-leds-multicolor", },
- {}
-};
-MODULE_DEVICE_TABLE(of, of_pwm_leds_mc_match);
-
-static struct platform_driver led_pwm_mc_driver = {
- .probe = led_pwm_mc_probe,
- .driver = {
- .name = "leds_pwm_multicolor",
- .of_match_table = of_pwm_leds_mc_match,
- },
-};
-module_platform_driver(led_pwm_mc_driver);
-
-MODULE_AUTHOR("Sven Schwermer <sven.schwermer@disruptive-technologies.com>");
-MODULE_DESCRIPTION("multi-color PWM LED driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:leds-pwm-multicolor");
if LEDS_CLASS_MULTICOLOR
+config LEDS_PWM_MULTICOLOR
+ tristate "PWM driven multi-color LED Support"
+ depends on PWM
+ help
+ This option enables support for PWM driven monochrome LEDs that are
+ grouped into multicolor LEDs.
+
+ To compile this driver as a module, choose M here: the module
+ will be called leds-pwm-multicolor.
+
config LEDS_QCOM_LPG
tristate "LED support for Qualcomm LPG"
depends on OF
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o
+obj-$(CONFIG_LEDS_PWM_MULTICOLOR) += leds-pwm-multicolor.o
+obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PWM-based multi-color LED control
+ *
+ * Copyright 2022 Sven Schwermer <sven.schwermer@disruptive-technologies.com>
+ */
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/led-class-multicolor.h>
+#include <linux/leds.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/pwm.h>
+
+struct pwm_led {
+ struct pwm_device *pwm;
+ struct pwm_state state;
+};
+
+struct pwm_mc_led {
+ struct led_classdev_mc mc_cdev;
+ struct mutex lock;
+ struct pwm_led leds[];
+};
+
+static int led_pwm_mc_set(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(cdev);
+ struct pwm_mc_led *priv = container_of(mc_cdev, struct pwm_mc_led, mc_cdev);
+ unsigned long long duty;
+ int ret = 0;
+ int i;
+
+ led_mc_calc_color_components(mc_cdev, brightness);
+
+ mutex_lock(&priv->lock);
+
+ for (i = 0; i < mc_cdev->num_colors; i++) {
+ duty = priv->leds[i].state.period;
+ duty *= mc_cdev->subled_info[i].brightness;
+ do_div(duty, cdev->max_brightness);
+
+ priv->leds[i].state.duty_cycle = duty;
+ priv->leds[i].state.enabled = duty > 0;
+ ret = pwm_apply_state(priv->leds[i].pwm,
+ &priv->leds[i].state);
+ if (ret)
+ break;
+ }
+
+ mutex_unlock(&priv->lock);
+
+ return ret;
+}
+
+static int iterate_subleds(struct device *dev, struct pwm_mc_led *priv,
+ struct fwnode_handle *mcnode)
+{
+ struct mc_subled *subled = priv->mc_cdev.subled_info;
+ struct fwnode_handle *fwnode;
+ struct pwm_led *pwmled;
+ u32 color;
+ int ret;
+
+ /* iterate over the nodes inside the multi-led node */
+ fwnode_for_each_child_node(mcnode, fwnode) {
+ pwmled = &priv->leds[priv->mc_cdev.num_colors];
+ pwmled->pwm = devm_fwnode_pwm_get(dev, fwnode, NULL);
+ if (IS_ERR(pwmled->pwm)) {
+ ret = PTR_ERR(pwmled->pwm);
+ dev_err(dev, "unable to request PWM: %d\n", ret);
+ goto release_fwnode;
+ }
+ pwm_init_state(pwmled->pwm, &pwmled->state);
+
+ ret = fwnode_property_read_u32(fwnode, "color", &color);
+ if (ret) {
+ dev_err(dev, "cannot read color: %d\n", ret);
+ goto release_fwnode;
+ }
+
+ subled[priv->mc_cdev.num_colors].color_index = color;
+ priv->mc_cdev.num_colors++;
+ }
+
+ return 0;
+
+release_fwnode:
+ fwnode_handle_put(fwnode);
+ return ret;
+}
+
+static int led_pwm_mc_probe(struct platform_device *pdev)
+{
+ struct fwnode_handle *mcnode, *fwnode;
+ struct led_init_data init_data = {};
+ struct led_classdev *cdev;
+ struct mc_subled *subled;
+ struct pwm_mc_led *priv;
+ int count = 0;
+ int ret = 0;
+
+ mcnode = device_get_named_child_node(&pdev->dev, "multi-led");
+ if (!mcnode)
+ return dev_err_probe(&pdev->dev, -ENODEV,
+ "expected multi-led node\n");
+
+ /* count the nodes inside the multi-led node */
+ fwnode_for_each_child_node(mcnode, fwnode)
+ count++;
+
+ priv = devm_kzalloc(&pdev->dev, struct_size(priv, leds, count),
+ GFP_KERNEL);
+ if (!priv) {
+ ret = -ENOMEM;
+ goto release_mcnode;
+ }
+ mutex_init(&priv->lock);
+
+ subled = devm_kcalloc(&pdev->dev, count, sizeof(*subled), GFP_KERNEL);
+ if (!subled) {
+ ret = -ENOMEM;
+ goto release_mcnode;
+ }
+ priv->mc_cdev.subled_info = subled;
+
+ /* init the multicolor's LED class device */
+ cdev = &priv->mc_cdev.led_cdev;
+ fwnode_property_read_u32(mcnode, "max-brightness",
+ &cdev->max_brightness);
+ cdev->flags = LED_CORE_SUSPENDRESUME;
+ cdev->brightness_set_blocking = led_pwm_mc_set;
+
+ ret = iterate_subleds(&pdev->dev, priv, mcnode);
+ if (ret)
+ goto release_mcnode;
+
+ init_data.fwnode = mcnode;
+ ret = devm_led_classdev_multicolor_register_ext(&pdev->dev,
+ &priv->mc_cdev,
+ &init_data);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "failed to register multicolor PWM led for %s: %d\n",
+ cdev->name, ret);
+ goto release_mcnode;
+ }
+
+ ret = led_pwm_mc_set(cdev, cdev->brightness);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to set led PWM value for %s: %d",
+ cdev->name, ret);
+
+ platform_set_drvdata(pdev, priv);
+ return 0;
+
+release_mcnode:
+ fwnode_handle_put(mcnode);
+ return ret;
+}
+
+static const struct of_device_id of_pwm_leds_mc_match[] = {
+ { .compatible = "pwm-leds-multicolor", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, of_pwm_leds_mc_match);
+
+static struct platform_driver led_pwm_mc_driver = {
+ .probe = led_pwm_mc_probe,
+ .driver = {
+ .name = "leds_pwm_multicolor",
+ .of_match_table = of_pwm_leds_mc_match,
+ },
+};
+module_platform_driver(led_pwm_mc_driver);
+
+MODULE_AUTHOR("Sven Schwermer <sven.schwermer@disruptive-technologies.com>");
+MODULE_DESCRIPTION("multi-color PWM LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:leds-pwm-multicolor");
projects / linux-block.git / commitdiff