// SPDX-License-Identifier: GPL-2.0-or-later /* * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED * * Copyright (C) 2010 LaCie * * Author: Simon Guinot * * Based on leds-gpio.c by Raphael Assenat */ #include #include #include #include #include #include #include #include "leds.h" enum ns2_led_modes { NS_V2_LED_OFF, NS_V2_LED_ON, NS_V2_LED_SATA, }; /* * If the size of this structure or types of its members is changed, * the filling of array modval in function ns2_led_register must be changed * accordingly. */ struct ns2_led_modval { u32 mode; u32 cmd_level; u32 slow_level; } __packed; /* * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED * modes are available: off, on and SATA activity blinking. The LED modes are * controlled through two GPIOs (command and slow): each combination of values * for the command/slow GPIOs corresponds to a LED mode. */ struct ns2_led { struct led_classdev cdev; struct gpio_desc *cmd; struct gpio_desc *slow; bool can_sleep; unsigned char sata; /* True when SATA mode active. */ rwlock_t rw_lock; /* Lock GPIOs. */ int num_modes; struct ns2_led_modval *modval; }; static int ns2_led_get_mode(struct ns2_led *led, enum ns2_led_modes *mode) { int i; int cmd_level; int slow_level; cmd_level = gpiod_get_value_cansleep(led->cmd); slow_level = gpiod_get_value_cansleep(led->slow); for (i = 0; i < led->num_modes; i++) { if (cmd_level == led->modval[i].cmd_level && slow_level == led->modval[i].slow_level) { *mode = led->modval[i].mode; return 0; } } return -EINVAL; } static void ns2_led_set_mode(struct ns2_led *led, enum ns2_led_modes mode) { int i; unsigned long flags; for (i = 0; i < led->num_modes; i++) if (mode == led->modval[i].mode) break; if (i == led->num_modes) return; write_lock_irqsave(&led->rw_lock, flags); if (!led->can_sleep) { gpiod_set_value(led->cmd, led->modval[i].cmd_level); gpiod_set_value(led->slow, led->modval[i].slow_level); goto exit_unlock; } gpiod_set_value_cansleep(led->cmd, led->modval[i].cmd_level); gpiod_set_value_cansleep(led->slow, led->modval[i].slow_level); exit_unlock: write_unlock_irqrestore(&led->rw_lock, flags); } static void ns2_led_set(struct led_classdev *led_cdev, enum led_brightness value) { struct ns2_led *led = container_of(led_cdev, struct ns2_led, cdev); enum ns2_led_modes mode; if (value == LED_OFF) mode = NS_V2_LED_OFF; else if (led->sata) mode = NS_V2_LED_SATA; else mode = NS_V2_LED_ON; ns2_led_set_mode(led, mode); } static int ns2_led_set_blocking(struct led_classdev *led_cdev, enum led_brightness value) { ns2_led_set(led_cdev, value); return 0; } static ssize_t ns2_led_sata_store(struct device *dev, struct device_attribute *attr, const char *buff, size_t count) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct ns2_led *led = container_of(led_cdev, struct ns2_led, cdev); int ret; unsigned long enable; ret = kstrtoul(buff, 10, &enable); if (ret < 0) return ret; enable = !!enable; if (led->sata == enable) goto exit; led->sata = enable; if (!led_get_brightness(led_cdev)) goto exit; if (enable) ns2_led_set_mode(led, NS_V2_LED_SATA); else ns2_led_set_mode(led, NS_V2_LED_ON); exit: return count; } static ssize_t ns2_led_sata_show(struct device *dev, struct device_attribute *attr, char *buf) { struct led_classdev *led_cdev = dev_get_drvdata(dev); struct ns2_led *led = container_of(led_cdev, struct ns2_led, cdev); return sprintf(buf, "%d\n", led->sata); } static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store); static struct attribute *ns2_led_attrs[] = { &dev_attr_sata.attr, NULL }; ATTRIBUTE_GROUPS(ns2_led); static int ns2_led_register(struct device *dev, struct fwnode_handle *node, struct ns2_led *led) { struct led_init_data init_data = {}; struct ns2_led_modval *modval; enum ns2_led_modes mode; int nmodes, ret; led->cmd = devm_fwnode_gpiod_get_index(dev, node, "cmd", 0, GPIOD_ASIS, fwnode_get_name(node)); if (IS_ERR(led->cmd)) return PTR_ERR(led->cmd); led->slow = devm_fwnode_gpiod_get_index(dev, node, "slow", 0, GPIOD_ASIS, fwnode_get_name(node)); if (IS_ERR(led->slow)) return PTR_ERR(led->slow); ret = fwnode_property_count_u32(node, "modes-map"); if (ret < 0 || ret % 3) { dev_err(dev, "Missing or malformed modes-map for %pfw\n", node); return -EINVAL; } nmodes = ret / 3; modval = devm_kcalloc(dev, nmodes, sizeof(*modval), GFP_KERNEL); if (!modval) return -ENOMEM; fwnode_property_read_u32_array(node, "modes-map", (void *)modval, nmodes * 3); rwlock_init(&led->rw_lock); led->cdev.blink_set = NULL; led->cdev.flags |= LED_CORE_SUSPENDRESUME; led->cdev.groups = ns2_led_groups; led->can_sleep = gpiod_cansleep(led->cmd) || gpiod_cansleep(led->slow); if (led->can_sleep) led->cdev.brightness_set_blocking = ns2_led_set_blocking; else led->cdev.brightness_set = ns2_led_set; led->num_modes = nmodes; led->modval = modval; ret = ns2_led_get_mode(led, &mode); if (ret < 0) return ret; /* Set LED initial state. */ led->sata = (mode == NS_V2_LED_SATA) ? 1 : 0; led->cdev.brightness = (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL; init_data.fwnode = node; ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); if (ret) dev_err(dev, "Failed to register LED for node %pfw\n", node); return ret; } static int ns2_led_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct ns2_led *leds; int count; int ret; count = device_get_child_node_count(dev); if (!count) return -ENODEV; leds = devm_kcalloc(dev, count, sizeof(*leds), GFP_KERNEL); if (!leds) return -ENOMEM; device_for_each_child_node_scoped(dev, child) { ret = ns2_led_register(dev, child, leds++); if (ret) return ret; } return 0; } static const struct of_device_id of_ns2_leds_match[] = { { .compatible = "lacie,ns2-leds", }, {}, }; MODULE_DEVICE_TABLE(of, of_ns2_leds_match); static struct platform_driver ns2_led_driver = { .probe = ns2_led_probe, .driver = { .name = "leds-ns2", .of_match_table = of_ns2_leds_match, }, }; module_platform_driver(ns2_led_driver); MODULE_AUTHOR("Simon Guinot "); MODULE_DESCRIPTION("Network Space v2 LED driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:leds-ns2");