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