leds: Add Dell Business Class Netbook LED driver

This patch adds an LED driver to support the Dell Activity LED on the
Dell Latitude 2100 netbook and future products to come. The Activity LED
is visible externally in the lid so classroom instructors can observe it
from a distance. The driver uses the sysfs led_class and provides a
standard LED interface.

Signed-off by: Bob Rodgers <Robert_Rodgers@dell.com>
Signed-off-by: Louis Davis <Louis_Davis@dell.com>
Signed-off-by: Jim Dailey <Jim_Dailey@dell.com>, Developers
Acked-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 200 insertions, 0 deletions

diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c
new file mode 100644
index 000000000000..ee310891fff8
--- /dev/null
+++ b/drivers/leds/dell-led.c
@@ -0,0 +1,200 @@
+/*
+ * dell_led.c - Dell LED Driver
+ *
+ * Copyright (C) 2010 Dell Inc.
+ * Louis Davis <louis_davis@dell.com>
+ * Jim Dailey <jim_dailey@dell.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.
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/leds.h>
+
+MODULE_AUTHOR("Louis Davis/Jim Dailey");
+MODULE_DESCRIPTION("Dell LED Control Driver");
+MODULE_LICENSE("GPL");
+
+#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
+MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
+
+/* Error Result Codes: */
+#define INVALID_DEVICE_ID       250
+#define INVALID_PARAMETER       251
+#define INVALID_BUFFER          252
+#define INTERFACE_ERROR         253
+#define UNSUPPORTED_COMMAND     254
+#define UNSPECIFIED_ERROR       255
+
+/* Device ID */
+#define DEVICE_ID_PANEL_BACK    1
+
+/* LED Commands */
+#define CMD_LED_ON      16
+#define CMD_LED_OFF     17
+#define CMD_LED_BLINK   18
+
+struct bios_args {
+        unsigned char length;
+        unsigned char result_code;
+        unsigned char device_id;
+        unsigned char command;
+        unsigned char on_time;
+        unsigned char off_time;
+};
+
+static int dell_led_perform_fn(u8 length,
+                u8 result_code,
+                u8 device_id,
+                u8 command,
+                u8 on_time,
+                u8 off_time)
+{
+        struct bios_args *bios_return;
+        u8 return_code;
+        union acpi_object *obj;
+        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+        struct acpi_buffer input;
+        acpi_status status;
+
+        struct bios_args args;
+        args.length = length;
+        args.result_code = result_code;
+        args.device_id = device_id;
+        args.command = command;
+        args.on_time = on_time;
+        args.off_time = off_time;
+
+        input.length = sizeof(struct bios_args);
+        input.pointer = &args;
+
+        status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
+                1,
+                1,
+                &input,
+                &output);
+
+        if (ACPI_FAILURE(status))
+                return status;
+
+        obj = output.pointer;
+
+        if (!obj)
+                return -EINVAL;
+        else if (obj->type != ACPI_TYPE_BUFFER) {
+                kfree(obj);
+                return -EINVAL;
+        }
+
+        bios_return = ((struct bios_args *)obj->buffer.pointer);
+        return_code = bios_return->result_code;
+
+        kfree(obj);
+
+        return return_code;
+}
+
+static int led_on(void)
+{
+        return dell_led_perform_fn(3,   /* Length of command */
+                INTERFACE_ERROR,        /* Init to  INTERFACE_ERROR */
+                DEVICE_ID_PANEL_BACK,   /* Device ID */
+                CMD_LED_ON,             /* Command */
+                0,                      /* not used */
+                0);                     /* not used */
+}
+
+static int led_off(void)
+{
+        return dell_led_perform_fn(3,   /* Length of command */
+                INTERFACE_ERROR,        /* Init to  INTERFACE_ERROR */
+                DEVICE_ID_PANEL_BACK,   /* Device ID */
+                CMD_LED_OFF,            /* Command */
+                0,                      /* not used */
+                0);                     /* not used */
+}
+
+static int led_blink(unsigned char on_eighths,
+                unsigned char off_eighths)
+{
+        return dell_led_perform_fn(5,   /* Length of command */
+                INTERFACE_ERROR,        /* Init to  INTERFACE_ERROR */
+                DEVICE_ID_PANEL_BACK,   /* Device ID */
+                CMD_LED_BLINK,          /* Command */
+                on_eighths,             /* blink on in eigths of a second */
+                off_eighths);           /* blink off in eights of a second */
+}
+
+static void dell_led_set(struct led_classdev *led_cdev,
+                enum led_brightness value)
+{
+        if (value == LED_OFF)
+                led_off();
+        else
+                led_on();
+}
+
+static int dell_led_blink(struct led_classdev *led_cdev,
+                unsigned long *delay_on,
+                unsigned long *delay_off)
+{
+        unsigned long on_eighths;
+        unsigned long off_eighths;
+
+        /* The Dell LED delay is based on 125ms intervals.
+           Need to round up to next interval. */
+
+        on_eighths = (*delay_on + 124) / 125;
+        if (0 == on_eighths)
+                on_eighths = 1;
+        if (on_eighths > 255)
+                on_eighths = 255;
+        *delay_on = on_eighths * 125;
+
+        off_eighths = (*delay_off + 124) / 125;
+        if (0 == off_eighths)
+                off_eighths = 1;
+        if (off_eighths > 255)
+                off_eighths = 255;
+        *delay_off = off_eighths * 125;
+
+        led_blink(on_eighths, off_eighths);
+
+        return 0;
+}
+
+static struct led_classdev dell_led = {
+        .name           = "dell::lid",
+        .brightness     = LED_OFF,
+        .max_brightness = 1,
+        .brightness_set = dell_led_set,
+        .blink_set      = dell_led_blink,
+        .flags          = LED_CORE_SUSPENDRESUME,
+};
+
+static int __init dell_led_init(void)
+{
+        int error = 0;
+
+        if (!wmi_has_guid(DELL_LED_BIOS_GUID))
+                return -ENODEV;
+
+        error = led_off();
+        if (error != 0)
+                return -ENODEV;
+
+        return led_classdev_register(NULL, &dell_led);
+}
+
+static void __exit dell_led_exit(void)
+{
+        led_classdev_unregister(&dell_led);
+
+        led_off();
+}
+
+module_init(dell_led_init);
+module_exit(dell_led_exit);