[PATCH 2/3] leds: add LED driver for Network Space v2 LEDs
Simon Guinot
simon at sequanux.org
Mon Jul 5 06:31:05 EDT 2010
From: Simon Guinot <sguinot at lacie.com>
This patch add a LED class driver for the dual-GPIO LEDs found on the
Network Space v2 board (and parents). This include Internet Space v2,
Network Space (Max) v2 and d2 Network v2 boards.
This dual-GPIO LED is wired to a CPLD and can blink in relation with the
SATA activity. The driver expose this capability through a "sata" sysfs
attribute.
Signed-off-by: Simon Guinot <sguinot at lacie.com>
---
drivers/leds/Kconfig | 8 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-ns2.c | 338 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/leds-ns2.h | 20 +++
4 files changed, 367 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/leds-ns2.c
create mode 100644 include/linux/leds-ns2.h
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 81bf25e..0ee58ac 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -302,6 +302,14 @@ config LEDS_MC13783
This option enable support for on-chip LED drivers found
on Freescale Semiconductor MC13783 PMIC.
+config LEDS_NS2
+ tristate "LED support for Network Space v2 GPIO LEDs"
+ depends on MACH_NETSPACE_V2 || MACH_INETSPACE_V2 || MACH_NETSPACE_MAX_V2
+ help
+ This option enable support for the dual-GPIO LED found on the
+ Network Space v2 board (and parents). This include Internet Space v2,
+ Network Space (Max) v2 and d2 Network v2 boards.
+
config LEDS_TRIGGERS
bool "LED Trigger support"
help
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 2493de4..7d6b958 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o
obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o
obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o
obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
+obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
# LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
diff --git a/drivers/leds/leds-ns2.c b/drivers/leds/leds-ns2.c
new file mode 100644
index 0000000..28af3d6
--- /dev/null
+++ b/drivers/leds/leds-ns2.c
@@ -0,0 +1,338 @@
+/*
+ * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
+ *
+ * Copyright (C) 2010 LaCie
+ *
+ * Author: Simon Guinot <sguinot at lacie.com>
+ *
+ * Based on leds-gpio.c by Raphael Assenat <raph at 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/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/leds.h>
+#include <linux/leds-ns2.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;
+};
+
+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(&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(&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;
+
+ write_lock(&led_dat->rw_lock);
+
+ 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(&led_dat->rw_lock);
+}
+
+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)
+{
+ int ret;
+ unsigned long enable;
+ enum ns2_led_modes mode;
+ struct ns2_led_data *led_dat = dev_get_drvdata(dev);
+
+ ret = strict_strtoul(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 ns2_led_data *led_dat = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", led_dat->sata);
+}
+
+static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
+
+static int __devinit
+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 = gpio_request(template->cmd, template->name);
+ if (ret == 0) {
+ ret = gpio_direction_output(template->cmd,
+ gpio_get_value(template->cmd));
+ if (ret)
+ gpio_free(template->cmd);
+ }
+ if (ret) {
+ dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
+ template->name);
+ }
+
+ ret = gpio_request(template->slow, template->name);
+ if (ret == 0) {
+ ret = gpio_direction_output(template->slow,
+ gpio_get_value(template->slow));
+ if (ret)
+ gpio_free(template->slow);
+ }
+ if (ret) {
+ dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
+ template->name);
+ goto err_free_cmd;
+ }
+
+ 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->cmd = template->cmd;
+ led_dat->slow = template->slow;
+
+ ret = ns2_led_get_mode(led_dat, &mode);
+ if (ret < 0)
+ goto err_free_slow;
+
+ /* 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)
+ goto err_free_slow;
+
+ dev_set_drvdata(led_dat->cdev.dev, led_dat);
+ ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
+ if (ret < 0)
+ goto err_free_cdev;
+
+ return 0;
+
+err_free_cdev:
+ led_classdev_unregister(&led_dat->cdev);
+err_free_slow:
+ gpio_free(led_dat->slow);
+err_free_cmd:
+ gpio_free(led_dat->cmd);
+
+ return ret;
+}
+
+static void __devexit delete_ns2_led(struct ns2_led_data *led_dat)
+{
+ device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
+ led_classdev_unregister(&led_dat->cdev);
+ gpio_free(led_dat->cmd);
+ gpio_free(led_dat->slow);
+}
+
+static int __devinit ns2_led_probe(struct platform_device *pdev)
+{
+ struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
+ struct ns2_led_data *leds_data;
+ int i;
+ int ret;
+
+ if (!pdata)
+ return -EINVAL;
+
+ leds_data = kzalloc(sizeof(struct ns2_led_data) *
+ pdata->num_leds, GFP_KERNEL);
+ if (!leds_data)
+ return -ENOMEM;
+
+ for (i = 0; i < pdata->num_leds; i++) {
+ ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
+ if (ret < 0)
+ goto err;
+
+ }
+
+ platform_set_drvdata(pdev, leds_data);
+
+ return 0;
+
+err:
+ for (i = i - 1; i >= 0; i--)
+ delete_ns2_led(&leds_data[i]);
+
+ kfree(leds_data);
+
+ return ret;
+}
+
+static int __devexit ns2_led_remove(struct platform_device *pdev)
+{
+ int i;
+ struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
+ struct ns2_led_data *leds_data;
+
+ leds_data = platform_get_drvdata(pdev);
+
+ for (i = 0; i < pdata->num_leds; i++)
+ delete_ns2_led(&leds_data[i]);
+
+ kfree(leds_data);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver ns2_led_driver = {
+ .probe = ns2_led_probe,
+ .remove = __devexit_p(ns2_led_remove),
+ .driver = {
+ .name = "leds-ns2",
+ .owner = THIS_MODULE,
+ },
+};
+MODULE_ALIAS("platform:leds-ns2");
+
+static int __init ns2_led_init(void)
+{
+ return platform_driver_register(&ns2_led_driver);
+}
+
+static void __exit ns2_led_exit(void)
+{
+ platform_driver_unregister(&ns2_led_driver);
+}
+
+module_init(ns2_led_init);
+module_exit(ns2_led_exit);
+
+MODULE_AUTHOR("Simon Guinot <sguinot at lacie.com>");
+MODULE_DESCRIPTION("Network Space v2 LED driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/leds-ns2.h b/include/linux/leds-ns2.h
new file mode 100644
index 0000000..c76ebbb
--- /dev/null
+++ b/include/linux/leds-ns2.h
@@ -0,0 +1,20 @@
+/*
+ * leds-ns2.h - platform data structure for Network Space v2 LED driver
+ */
+
+#ifndef __LEDS_NS2_H
+#define __LEDS_NS2_H
+
+struct ns2_led {
+ const char *name;
+ const char *default_trigger;
+ unsigned cmd;
+ unsigned slow;
+};
+
+struct ns2_led_platform_data {
+ int num_leds;
+ struct ns2_led *leds;
+};
+
+#endif /* __LEDS_NS2_H */
--
1.6.3.1
More information about the linux-arm-kernel
mailing list