--- /dev/null
+/*
+ * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
+ *
+ * Copyright (C) 2010 LaCie
+ *
+ * Author: Simon Guinot <sguinot@lacie.com>
+ *
+ * Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/leds-kirkwood-ns2.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+
+/*
+ * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
+ * relation with the SATA activity. This capability is exposed through the
+ * "sata" sysfs attribute.
+ *
+ * The following array detail the different LED registers and the combination
+ * of their possible values:
+ *
+ * cmd_led | slow_led | /SATA active | LED state
+ * | | |
+ * 1 | 0 | x | off
+ * - | 1 | x | on
+ * 0 | 0 | 1 | on
+ * 0 | 0 | 0 | blink (rate 300ms)
+ */
+
+enum ns2_led_modes {
+ NS_V2_LED_OFF,
+ NS_V2_LED_ON,
+ NS_V2_LED_SATA,
+};
+
+struct ns2_led_mode_value {
+ enum ns2_led_modes mode;
+ int cmd_level;
+ int slow_level;
+};
+
+static struct ns2_led_mode_value ns2_led_modval[] = {
+ { NS_V2_LED_OFF , 1, 0 },
+ { NS_V2_LED_ON , 0, 1 },
+ { NS_V2_LED_ON , 1, 1 },
+ { NS_V2_LED_SATA, 0, 0 },
+};
+
+struct ns2_led_data {
+ struct led_classdev cdev;
+ unsigned cmd;
+ unsigned slow;
+ unsigned char sata; /* True when SATA mode active. */
+ rwlock_t rw_lock; /* Lock GPIOs. */
+};
+
+static int ns2_led_get_mode(struct ns2_led_data *led_dat,
+ enum ns2_led_modes *mode)
+{
+ int i;
+ int ret = -EINVAL;
+ int cmd_level;
+ int slow_level;
+
+ read_lock_irq(&led_dat->rw_lock);
+
+ cmd_level = gpio_get_value(led_dat->cmd);
+ slow_level = gpio_get_value(led_dat->slow);
+
+ for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
+ if (cmd_level == ns2_led_modval[i].cmd_level &&
+ slow_level == ns2_led_modval[i].slow_level) {
+ *mode = ns2_led_modval[i].mode;
+ ret = 0;
+ break;
+ }
+ }
+
+ read_unlock_irq(&led_dat->rw_lock);
+
+ return ret;
+}
+
+static void ns2_led_set_mode(struct ns2_led_data *led_dat,
+ enum ns2_led_modes mode)
+{
+ int i;
+ unsigned long flags;
+
+ write_lock_irqsave(&led_dat->rw_lock, flags);
+
+ for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
+ if (mode == ns2_led_modval[i].mode) {
+ gpio_set_value(led_dat->cmd,
+ ns2_led_modval[i].cmd_level);
+ gpio_set_value(led_dat->slow,
+ ns2_led_modval[i].slow_level);
+ }
+ }
+
+ write_unlock_irqrestore(&led_dat->rw_lock, flags);
+}
+
+static void ns2_led_set(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct ns2_led_data *led_dat =
+ container_of(led_cdev, struct ns2_led_data, cdev);
+ enum ns2_led_modes mode;
+
+ if (value == LED_OFF)
+ mode = NS_V2_LED_OFF;
+ else if (led_dat->sata)
+ mode = NS_V2_LED_SATA;
+ else
+ mode = NS_V2_LED_ON;
+
+ ns2_led_set_mode(led_dat, mode);
+}
+
+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_data *led_dat =
+ container_of(led_cdev, struct ns2_led_data, cdev);
+ int ret;
+ unsigned long enable;
+ enum ns2_led_modes mode;
+
+ ret = kstrtoul(buff, 10, &enable);
+ if (ret < 0)
+ return ret;
+
+ enable = !!enable;
+
+ if (led_dat->sata == enable)
+ return count;
+
+ ret = ns2_led_get_mode(led_dat, &mode);
+ if (ret < 0)
+ return ret;
+
+ if (enable && mode == NS_V2_LED_ON)
+ ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
+ if (!enable && mode == NS_V2_LED_SATA)
+ ns2_led_set_mode(led_dat, NS_V2_LED_ON);
+
+ led_dat->sata = enable;
+
+ 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_data *led_dat =
+ container_of(led_cdev, struct ns2_led_data, cdev);
+
+ return sprintf(buf, "%d\n", led_dat->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
+create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
+ const struct ns2_led *template)
+{
+ int ret;
+ enum ns2_led_modes mode;
+
+ ret = devm_gpio_request_one(&pdev->dev, template->cmd,
+ gpio_get_value(template->cmd) ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ template->name);
+ if (ret) {
+ dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
+ template->name);
+ return ret;
+ }
+
+ ret = devm_gpio_request_one(&pdev->dev, template->slow,
+ gpio_get_value(template->slow) ?
+ GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ template->name);
+ if (ret) {
+ dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
+ template->name);
+ return ret;
+ }
+
+ rwlock_init(&led_dat->rw_lock);
+
+ led_dat->cdev.name = template->name;
+ led_dat->cdev.default_trigger = template->default_trigger;
+ led_dat->cdev.blink_set = NULL;
+ led_dat->cdev.brightness_set = ns2_led_set;
+ led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+ led_dat->cdev.groups = ns2_led_groups;
+ led_dat->cmd = template->cmd;
+ led_dat->slow = template->slow;
+
+ ret = ns2_led_get_mode(led_dat, &mode);
+ if (ret < 0)
+ return ret;
+
+ /* Set LED initial state. */
+ led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
+ led_dat->cdev.brightness =
+ (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
+
+ ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static void delete_ns2_led(struct ns2_led_data *led_dat)
+{
+ led_classdev_unregister(&led_dat->cdev);
+}
+
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data.
+ */
+static int
+ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *child;
+ struct ns2_led *leds;
+ int num_leds = 0;
+ int i = 0;
+
+ num_leds = of_get_child_count(np);
+ if (!num_leds)
+ return -ENODEV;
+
+ leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
+ GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ for_each_child_of_node(np, child) {
+ const char *string;
+ int ret;
+
+ ret = of_get_named_gpio(child, "cmd-gpio", 0);
+ if (ret < 0)
+ return ret;
+ leds[i].cmd = ret;
+ ret = of_get_named_gpio(child, "slow-gpio", 0);
+ if (ret < 0)
+ return ret;
+ leds[i].slow = ret;
+ ret = of_property_read_string(child, "label", &string);
+ leds[i].name = (ret == 0) ? string : child->name;
+ ret = of_property_read_string(child, "linux,default-trigger",
+ &string);
+ if (ret == 0)
+ leds[i].default_trigger = string;
+
+ i++;
+ }
+
+ pdata->leds = leds;
+ pdata->num_leds = num_leds;
+
+ return 0;
+}
+
+static const struct of_device_id of_ns2_leds_match[] = {
+ { .compatible = "lacie,ns2-leds", },
+ {},
+};
+#endif /* CONFIG_OF_GPIO */
+
+struct ns2_led_priv {
+ int num_leds;
+ struct ns2_led_data leds_data[];
+};
+
+static inline int sizeof_ns2_led_priv(int num_leds)
+{
+ return sizeof(struct ns2_led_priv) +
+ (sizeof(struct ns2_led_data) * num_leds);
+}
+
+static int ns2_led_probe(struct platform_device *pdev)
+{
+ struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct ns2_led_priv *priv;
+ int i;
+ int ret;
+
+#ifdef CONFIG_OF_GPIO
+ if (!pdata) {
+ pdata = devm_kzalloc(&pdev->dev,
+ sizeof(struct ns2_led_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
+ if (ret)
+ return ret;
+ }
+#else
+ if (!pdata)
+ return -EINVAL;
+#endif /* CONFIG_OF_GPIO */
+
+ priv = devm_kzalloc(&pdev->dev,
+ sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ priv->num_leds = pdata->num_leds;
+
+ for (i = 0; i < priv->num_leds; i++) {
+ ret = create_ns2_led(pdev, &priv->leds_data[i],
+ &pdata->leds[i]);
+ if (ret < 0) {
+ for (i = i - 1; i >= 0; i--)
+ delete_ns2_led(&priv->leds_data[i]);
+ return ret;
+ }
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+}
+
+static int ns2_led_remove(struct platform_device *pdev)
+{
+ int i;
+ struct ns2_led_priv *priv;
+
+ priv = platform_get_drvdata(pdev);
+
+ for (i = 0; i < priv->num_leds; i++)
+ delete_ns2_led(&priv->leds_data[i]);
+
+ return 0;
+}
+
+static struct platform_driver ns2_led_driver = {
+ .probe = ns2_led_probe,
+ .remove = ns2_led_remove,
+ .driver = {
+ .name = "leds-ns2",
+ .of_match_table = of_match_ptr(of_ns2_leds_match),
+ },
+};
+
+module_platform_driver(ns2_led_driver);
+
+MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
+MODULE_DESCRIPTION("Network Space v2 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-ns2");
Code Review / kvmfornfv.git / blobdiff