285 lines
6.5 KiB
C
285 lines
6.5 KiB
C
// 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 <sguinot@lacie.com>
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*
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* Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
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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_kcalloc(dev, count, sizeof(*leds), 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 <sguinot@lacie.com>");
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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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