leds: ALIX.2 LEDs driver
Driver for PC Engines ALIX.2 and ALIX.3 LEDs.
Signed-off-by: Constantin Baranov <const@mimas.ru>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
diff --git a/drivers/leds/leds-alix2.c b/drivers/leds/leds-alix2.c
new file mode 100644
index 0000000..d7666e6
--- /dev/null
+++ b/drivers/leds/leds-alix2.c
@@ -0,0 +1,209 @@
+/*
+ * LEDs driver for PCEngines ALIX.2 and ALIX.3
+ *
+ * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+
+static int force = 0;
+module_param(force, bool, 0444);
+MODULE_PARM_DESC(force, "Assume system has ALIX.2 style LEDs");
+
+struct alix_led {
+ struct led_classdev cdev;
+ unsigned short port;
+ unsigned int on_value;
+ unsigned int off_value;
+};
+
+static void alix_led_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct alix_led *led_dev =
+ container_of(led_cdev, struct alix_led, cdev);
+
+ if (brightness)
+ outl(led_dev->on_value, led_dev->port);
+ else
+ outl(led_dev->off_value, led_dev->port);
+}
+
+static struct alix_led alix_leds[] = {
+ {
+ .cdev = {
+ .name = "alix:1",
+ .brightness_set = alix_led_set,
+ },
+ .port = 0x6100,
+ .on_value = 1 << 22,
+ .off_value = 1 << 6,
+ },
+ {
+ .cdev = {
+ .name = "alix:2",
+ .brightness_set = alix_led_set,
+ },
+ .port = 0x6180,
+ .on_value = 1 << 25,
+ .off_value = 1 << 9,
+ },
+ {
+ .cdev = {
+ .name = "alix:3",
+ .brightness_set = alix_led_set,
+ },
+ .port = 0x6180,
+ .on_value = 1 << 27,
+ .off_value = 1 << 11,
+ },
+};
+
+#ifdef CONFIG_PM
+
+static int alix_led_suspend(struct platform_device *dev, pm_message_t state)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
+ led_classdev_suspend(&alix_leds[i].cdev);
+ return 0;
+}
+
+static int alix_led_resume(struct platform_device *dev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
+ led_classdev_resume(&alix_leds[i].cdev);
+ return 0;
+}
+
+#else
+
+#define alix_led_suspend NULL
+#define alix_led_resume NULL
+
+#endif
+
+static int __init alix_led_probe(struct platform_device *pdev)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
+ ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
+ if (ret < 0)
+ goto fail;
+ }
+ return 0;
+
+fail:
+ while (--i >= 0)
+ led_classdev_unregister(&alix_leds[i].cdev);
+ return ret;
+}
+
+static int alix_led_remove(struct platform_device *pdev)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
+ led_classdev_unregister(&alix_leds[i].cdev);
+ return 0;
+}
+
+static struct platform_driver alix_led_driver = {
+ .remove = alix_led_remove,
+ .suspend = alix_led_suspend,
+ .resume = alix_led_resume,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init alix_present(void)
+{
+ const unsigned long bios_phys = 0x000f0000;
+ const size_t bios_len = 0x00010000;
+ const char alix_sig[] = "PC Engines ALIX.";
+ const size_t alix_sig_len = sizeof(alix_sig) - 1;
+
+ const char *bios_virt;
+ const char *scan_end;
+ const char *p;
+ int ret = 0;
+
+ if (force) {
+ printk(KERN_NOTICE "%s: forced to skip BIOS test, "
+ "assume system has ALIX.2 style LEDs\n",
+ KBUILD_MODNAME);
+ ret = 1;
+ goto out;
+ }
+
+ bios_virt = phys_to_virt(bios_phys);
+ scan_end = bios_virt + bios_len - (alix_sig_len + 2);
+ for (p = bios_virt; p < scan_end; p++) {
+ const char *tail;
+
+ if (memcmp(p, alix_sig, alix_sig_len) != 0) {
+ continue;
+ }
+
+ tail = p + alix_sig_len;
+ if ((tail[0] == '2' || tail[0] == '3') && tail[1] == '\0') {
+ printk(KERN_INFO
+ "%s: system is recognized as \"%s\"\n",
+ KBUILD_MODNAME, p);
+ ret = 1;
+ break;
+ }
+ }
+
+out:
+ return ret;
+}
+
+static struct platform_device *pdev;
+
+static int __init alix_led_init(void)
+{
+ int ret;
+
+ if (!alix_present()) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
+ if (!IS_ERR(pdev)) {
+ ret = platform_driver_probe(&alix_led_driver, alix_led_probe);
+ if (ret)
+ platform_device_unregister(pdev);
+ } else
+ ret = PTR_ERR(pdev);
+
+out:
+ return ret;
+}
+
+static void __exit alix_led_exit(void)
+{
+ platform_device_unregister(pdev);
+ platform_driver_unregister(&alix_led_driver);
+}
+
+module_init(alix_led_init);
+module_exit(alix_led_exit);
+
+MODULE_AUTHOR("Constantin Baranov <const@mimas.ru>");
+MODULE_DESCRIPTION("PCEngines ALIX.2 and ALIX.3 LED driver");
+MODULE_LICENSE("GPL");