leds: Add new driver for the LEDs on the Freecom FSG-3

The LEDs on the Freecom FSG-3 are connected to an external
memory-mapped latch on the ixp4xx expansion bus, and therefore cannot
be supported by any of the existing LEDs drivers.

Signed-off-by: Rod Whitby <rod@whitby.id.au>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 261 insertions, 0 deletions

diff --git a/drivers/leds/leds-fsg.c b/drivers/leds/leds-fsg.c
new file mode 100644
index 000000000000..a7421b8c47d8
--- /dev/null
+++ b/drivers/leds/leds-fsg.c
@@ -0,0 +1,261 @@
+/*
+ * LED Driver for the Freecom FSG-3
+ *
+ * Copyright (c) 2008 Rod Whitby <rod@whitby.id.au>
+ *
+ * Author: Rod Whitby <rod@whitby.id.au>
+ *
+ * Based on leds-spitz.c
+ * Copyright 2005-2006 Openedhand Ltd.
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+
+static short __iomem *latch_address;
+static unsigned short latch_value;
+
+
+static void fsg_led_wlan_set(struct led_classdev *led_cdev,
+                             enum led_brightness value)
+{
+        if (value) {
+                latch_value &= ~(1 << FSG_LED_WLAN_BIT);
+                *latch_address = latch_value;
+        } else {
+                latch_value |=  (1 << FSG_LED_WLAN_BIT);
+                *latch_address = latch_value;
+        }
+}
+
+static void fsg_led_wan_set(struct led_classdev *led_cdev,
+                            enum led_brightness value)
+{
+        if (value) {
+                latch_value &= ~(1 << FSG_LED_WAN_BIT);
+                *latch_address = latch_value;
+        } else {
+                latch_value |=  (1 << FSG_LED_WAN_BIT);
+                *latch_address = latch_value;
+        }
+}
+
+static void fsg_led_sata_set(struct led_classdev *led_cdev,
+                             enum led_brightness value)
+{
+        if (value) {
+                latch_value &= ~(1 << FSG_LED_SATA_BIT);
+                *latch_address = latch_value;
+        } else {
+                latch_value |=  (1 << FSG_LED_SATA_BIT);
+                *latch_address = latch_value;
+        }
+}
+
+static void fsg_led_usb_set(struct led_classdev *led_cdev,
+                            enum led_brightness value)
+{
+        if (value) {
+                latch_value &= ~(1 << FSG_LED_USB_BIT);
+                *latch_address = latch_value;
+        } else {
+                latch_value |=  (1 << FSG_LED_USB_BIT);
+                *latch_address = latch_value;
+        }
+}
+
+static void fsg_led_sync_set(struct led_classdev *led_cdev,
+                             enum led_brightness value)
+{
+        if (value) {
+                latch_value &= ~(1 << FSG_LED_SYNC_BIT);
+                *latch_address = latch_value;
+        } else {
+                latch_value |=  (1 << FSG_LED_SYNC_BIT);
+                *latch_address = latch_value;
+        }
+}
+
+static void fsg_led_ring_set(struct led_classdev *led_cdev,
+                             enum led_brightness value)
+{
+        if (value) {
+                latch_value &= ~(1 << FSG_LED_RING_BIT);
+                *latch_address = latch_value;
+        } else {
+                latch_value |=  (1 << FSG_LED_RING_BIT);
+                *latch_address = latch_value;
+        }
+}
+
+
+
+static struct led_classdev fsg_wlan_led = {
+        .name                   = "fsg:blue:wlan",
+        .brightness_set         = fsg_led_wlan_set,
+};
+
+static struct led_classdev fsg_wan_led = {
+        .name                   = "fsg:blue:wan",
+        .brightness_set         = fsg_led_wan_set,
+};
+
+static struct led_classdev fsg_sata_led = {
+        .name                   = "fsg:blue:sata",
+        .brightness_set         = fsg_led_sata_set,
+};
+
+static struct led_classdev fsg_usb_led = {
+        .name                   = "fsg:blue:usb",
+        .brightness_set         = fsg_led_usb_set,
+};
+
+static struct led_classdev fsg_sync_led = {
+        .name                   = "fsg:blue:sync",
+        .brightness_set         = fsg_led_sync_set,
+};
+
+static struct led_classdev fsg_ring_led = {
+        .name                   = "fsg:blue:ring",
+        .brightness_set         = fsg_led_ring_set,
+};
+
+
+
+#ifdef CONFIG_PM
+static int fsg_led_suspend(struct platform_device *dev, pm_message_t state)
+{
+        led_classdev_suspend(&fsg_wlan_led);
+        led_classdev_suspend(&fsg_wan_led);
+        led_classdev_suspend(&fsg_sata_led);
+        led_classdev_suspend(&fsg_usb_led);
+        led_classdev_suspend(&fsg_sync_led);
+        led_classdev_suspend(&fsg_ring_led);
+        return 0;
+}
+
+static int fsg_led_resume(struct platform_device *dev)
+{
+        led_classdev_resume(&fsg_wlan_led);
+        led_classdev_resume(&fsg_wan_led);
+        led_classdev_resume(&fsg_sata_led);
+        led_classdev_resume(&fsg_usb_led);
+        led_classdev_resume(&fsg_sync_led);
+        led_classdev_resume(&fsg_ring_led);
+        return 0;
+}
+#endif
+
+
+static int fsg_led_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
+        if (ret < 0)
+                goto failwlan;
+
+        ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
+        if (ret < 0)
+                goto failwan;
+
+        ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
+        if (ret < 0)
+                goto failsata;
+
+        ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
+        if (ret < 0)
+                goto failusb;
+
+        ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
+        if (ret < 0)
+                goto failsync;
+
+        ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
+        if (ret < 0)
+                goto failring;
+
+        /* Map the LED chip select address space */
+        latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
+        if (!latch_address) {
+                ret = -ENOMEM;
+                goto failremap;
+        }
+
+        latch_value = 0xffff;
+        *latch_address = latch_value;
+
+        return ret;
+
+ failremap:
+        led_classdev_unregister(&fsg_ring_led);
+ failring:
+        led_classdev_unregister(&fsg_sync_led);
+ failsync:
+        led_classdev_unregister(&fsg_usb_led);
+ failusb:
+        led_classdev_unregister(&fsg_sata_led);
+ failsata:
+        led_classdev_unregister(&fsg_wan_led);
+ failwan:
+        led_classdev_unregister(&fsg_wlan_led);
+ failwlan:
+
+        return ret;
+}
+
+static int fsg_led_remove(struct platform_device *pdev)
+{
+        iounmap(latch_address);
+
+        led_classdev_unregister(&fsg_wlan_led);
+        led_classdev_unregister(&fsg_wan_led);
+        led_classdev_unregister(&fsg_sata_led);
+        led_classdev_unregister(&fsg_usb_led);
+        led_classdev_unregister(&fsg_sync_led);
+        led_classdev_unregister(&fsg_ring_led);
+
+        return 0;
+}
+
+
+static struct platform_driver fsg_led_driver = {
+        .probe          = fsg_led_probe,
+        .remove         = fsg_led_remove,
+#ifdef CONFIG_PM
+        .suspend        = fsg_led_suspend,
+        .resume         = fsg_led_resume,
+#endif
+        .driver         = {
+                .name           = "fsg-led",
+        },
+};
+
+
+static int __init fsg_led_init(void)
+{
+        return platform_driver_register(&fsg_led_driver);
+}
+
+static void __exit fsg_led_exit(void)
+{
+        platform_driver_unregister(&fsg_led_driver);
+}
+
+
+module_init(fsg_led_init);
+module_exit(fsg_led_exit);
+
+MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
+MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
+MODULE_LICENSE("GPL");