+++ /dev/null
-From ecbd9c87f073f097d9fe56390353e64e963e866a Mon Sep 17 00:00:00 2001
-From: John Crispin <john@phrozen.org>
-Date: Tue, 6 Mar 2018 10:03:03 +0100
-Subject: [PATCH 03/27] leds: add reset-controller based driver
-
-Signed-off-by: John Crispin <john@phrozen.org>
----
- drivers/leds/Kconfig | 11 ++++
- drivers/leds/Makefile | 1 +
- drivers/leds/leds-reset.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 149 insertions(+)
- create mode 100644 drivers/leds/leds-reset.c
-
---- a/drivers/leds/Kconfig
-+++ b/drivers/leds/Kconfig
-@@ -756,6 +756,17 @@ config LEDS_NIC78BX
- To compile this driver as a module, choose M here: the module
- will be called leds-nic78bx.
-
-+config LEDS_RESET
-+ tristate "LED support for reset-controller API"
-+ depends on LEDS_CLASS
-+ depends on RESET_CONTROLLER
-+ help
-+ This option enables support for LEDs connected to pins driven by reset
-+ controllers. Yes, DNI actual built HW like that.
-+
-+ To compile this driver as a module, choose M here: the module
-+ will be called leds-reset.
-+
- comment "LED Triggers"
- source "drivers/leds/trigger/Kconfig"
-
---- /dev/null
-+++ b/drivers/leds/leds-reset.c
-@@ -0,0 +1,140 @@
-+/*
-+ * Copyright (C) 2018 John Crispin <john@phrozen.org>
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ *
-+ */
-+#include <linux/err.h>
-+#include <linux/reset.h>
-+#include <linux/kernel.h>
-+#include <linux/leds.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/platform_device.h>
-+#include <linux/reset.h>
-+
-+struct reset_led_data {
-+ struct led_classdev cdev;
-+ struct reset_control *rst;
-+};
-+
-+static inline struct reset_led_data *
-+ cdev_to_reset_led_data(struct led_classdev *led_cdev)
-+{
-+ return container_of(led_cdev, struct reset_led_data, cdev);
-+}
-+
-+static void reset_led_set(struct led_classdev *led_cdev,
-+ enum led_brightness value)
-+{
-+ struct reset_led_data *led_dat = cdev_to_reset_led_data(led_cdev);
-+
-+ if (value == LED_OFF)
-+ reset_control_assert(led_dat->rst);
-+ else
-+ reset_control_deassert(led_dat->rst);
-+}
-+
-+struct reset_leds_priv {
-+ int num_leds;
-+ struct reset_led_data leds[];
-+};
-+
-+static inline int sizeof_reset_leds_priv(int num_leds)
-+{
-+ return sizeof(struct reset_leds_priv) +
-+ (sizeof(struct reset_led_data) * num_leds);
-+}
-+
-+static struct reset_leds_priv *reset_leds_create(struct platform_device *pdev)
-+{
-+ struct device *dev = &pdev->dev;
-+ struct fwnode_handle *child;
-+ struct reset_leds_priv *priv;
-+ int count, ret;
-+
-+ count = device_get_child_node_count(dev);
-+ if (!count)
-+ return ERR_PTR(-ENODEV);
-+
-+ priv = devm_kzalloc(dev, sizeof_reset_leds_priv(count), GFP_KERNEL);
-+ if (!priv)
-+ return ERR_PTR(-ENOMEM);
-+
-+ device_for_each_child_node(dev, child) {
-+ struct reset_led_data *led = &priv->leds[priv->num_leds];
-+ struct device_node *np = to_of_node(child);
-+
-+ ret = fwnode_property_read_string(child, "label", &led->cdev.name);
-+ if (!led->cdev.name) {
-+ fwnode_handle_put(child);
-+ return ERR_PTR(-EINVAL);
-+ }
-+ led->rst = __of_reset_control_get(np, NULL, 0, 0, 0);
-+ if (IS_ERR(led->rst))
-+ return ERR_PTR(-EINVAL);
-+
-+ fwnode_property_read_string(child, "linux,default-trigger",
-+ &led->cdev.default_trigger);
-+
-+ led->cdev.brightness_set = reset_led_set;
-+ ret = devm_of_led_classdev_register(&pdev->dev, np, &led->cdev);
-+ if (ret < 0)
-+ return ERR_PTR(ret);
-+ led->cdev.dev->of_node = np;
-+ priv->num_leds++;
-+ }
-+
-+ return priv;
-+}
-+
-+static const struct of_device_id of_reset_leds_match[] = {
-+ { .compatible = "reset-leds", },
-+ {},
-+};
-+
-+MODULE_DEVICE_TABLE(of, of_reset_leds_match);
-+
-+static int reset_led_probe(struct platform_device *pdev)
-+{
-+ struct reset_leds_priv *priv;
-+
-+ priv = reset_leds_create(pdev);
-+ if (IS_ERR(priv))
-+ return PTR_ERR(priv);
-+
-+ platform_set_drvdata(pdev, priv);
-+
-+ return 0;
-+}
-+
-+static void reset_led_shutdown(struct platform_device *pdev)
-+{
-+ struct reset_leds_priv *priv = platform_get_drvdata(pdev);
-+ int i;
-+
-+ for (i = 0; i < priv->num_leds; i++) {
-+ struct reset_led_data *led = &priv->leds[i];
-+
-+ if (!(led->cdev.flags & LED_RETAIN_AT_SHUTDOWN))
-+ reset_led_set(&led->cdev, LED_OFF);
-+ }
-+}
-+
-+static struct platform_driver reset_led_driver = {
-+ .probe = reset_led_probe,
-+ .shutdown = reset_led_shutdown,
-+ .driver = {
-+ .name = "leds-reset",
-+ .of_match_table = of_reset_leds_match,
-+ },
-+};
-+
-+module_platform_driver(reset_led_driver);
-+
-+MODULE_AUTHOR("John Crispin <john@phrozen.org>");
-+MODULE_DESCRIPTION("reset controller LED driver");
-+MODULE_LICENSE("GPL");
-+MODULE_ALIAS("platform:leds-reset");
---- a/drivers/leds/Makefile
-+++ b/drivers/leds/Makefile
-@@ -78,6 +78,7 @@ obj-$(CONFIG_LEDS_MT6323) += leds-mt632
- obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o
- obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o
- obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o
-+obj-$(CONFIG_LEDS_RESET) += leds-reset.o
-
- # LED SPI Drivers
- obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o
projects / openwrt / openwrt.git / blobdiff