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/Kconfig b/drivers/leds/Kconfig
index e7fb7d2fcbfc4792abc91993337620a562a3323c..b7f9e251b5a2038a689c19359dc8541b3ac28d79 100644 (file)
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -63,6 +63,12 @@ config LEDS_WRAP
        help
          This option enables support for the PCEngines WRAP programmable LEDs.
 
+config LEDS_ALIX2
+       tristate "LED Support for ALIX.2 and ALIX.3 series"
+       depends on LEDS_CLASS && X86 && EXPERIMENTAL
+       help
+         This option enables support for the PCEngines ALIX.2 and ALIX.3 LEDs.
+
 config LEDS_H1940
        tristate "LED Support for iPAQ H1940 device"
        depends on LEDS_CLASS && ARCH_H1940

diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index e1967a29850e8b1c4ef446af8030ddfe1a547658..ff4616a49043a91c00350f02e0fb1e826e5c4e7c 100644 (file)
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_LEDS_S3C24XX)            += leds-s3c24xx.o
 obj-$(CONFIG_LEDS_AMS_DELTA)           += leds-ams-delta.o
 obj-$(CONFIG_LEDS_NET48XX)             += leds-net48xx.o
 obj-$(CONFIG_LEDS_WRAP)                        += leds-wrap.o
+obj-$(CONFIG_LEDS_ALIX2)               += leds-alix2.o
 obj-$(CONFIG_LEDS_H1940)               += leds-h1940.o
 obj-$(CONFIG_LEDS_COBALT_QUBE)         += leds-cobalt-qube.o
 obj-$(CONFIG_LEDS_COBALT_RAQ)          += leds-cobalt-raq.o

diff --git a/drivers/leds/leds-alix2.c b/drivers/leds/leds-alix2.c
new file mode 100644 (file)
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");