diff options
Diffstat (limited to 'target/linux/ath79/patches-5.4/0003-leds-add-reset-controller-based-driver.patch')
| -rw-r--r-- | target/linux/ath79/patches-5.4/0003-leds-add-reset-controller-based-driver.patch | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/target/linux/ath79/patches-5.4/0003-leds-add-reset-controller-based-driver.patch b/target/linux/ath79/patches-5.4/0003-leds-add-reset-controller-based-driver.patch new file mode 100644 index 0000000000..3249e1e82b --- /dev/null +++ b/target/linux/ath79/patches-5.4/0003-leds-add-reset-controller-based-driver.patch @@ -0,0 +1,186 @@ +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 +@@ -823,6 +823,17 @@ config LEDS_LM36274 + Say Y to enable the LM36274 LED driver for TI LMU devices. + This supports the LED device LM36274. + ++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, true); ++ 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_led_classdev_register(&pdev->dev, &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 +@@ -85,6 +85,7 @@ obj-$(CONFIG_LEDS_LM3601X) += leds-lm36 + obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o + obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o + obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o ++obj-$(CONFIG_LEDS_RESET) += leds-reset.o + + # LED SPI Drivers + obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o |