1 files changed, 359 insertions, 0 deletions
diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c
new file mode 100644
index 000000000..c36acaf56
--- /dev/null
+++ b/drivers/leds/dell-led.c
@@ -0,0 +1,359 @@
+/*
+ * 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>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/dell-led.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"
+#define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
+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 app_wmi_args {
+	u16 class;
+	u16 selector;
+	u32 arg1;
+	u32 arg2;
+	u32 arg3;
+	u32 arg4;
+	u32 res1;
+	u32 res2;
+	u32 res3;
+	u32 res4;
+	char dummy[92];
+};
+
+#define GLOBAL_MIC_MUTE_ENABLE	0x364
+#define GLOBAL_MIC_MUTE_DISABLE	0x365
+
+struct dell_bios_data_token {
+	u16 tokenid;
+	u16 location;
+	u16 value;
+};
+
+struct __attribute__ ((__packed__)) dell_bios_calling_interface {
+	struct	dmi_header header;
+	u16	cmd_io_addr;
+	u8	cmd_io_code;
+	u32	supported_cmds;
+	struct	dell_bios_data_token damap[];
+};
+
+static struct dell_bios_data_token dell_mic_tokens[2];
+
+static int dell_wmi_perform_query(struct app_wmi_args *args)
+{
+	struct app_wmi_args *bios_return;
+	union acpi_object *obj;
+	struct acpi_buffer input;
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	acpi_status status;
+	u32 rc = -EINVAL;
+
+	input.length = 128;
+	input.pointer = args;
+
+	status = wmi_evaluate_method(DELL_APP_GUID, 0, 1, &input, &output);
+	if (!ACPI_SUCCESS(status))
+		goto err_out0;
+
+	obj = output.pointer;
+	if (!obj)
+		goto err_out0;
+
+	if (obj->type != ACPI_TYPE_BUFFER)
+		goto err_out1;
+
+	bios_return = (struct app_wmi_args *)obj->buffer.pointer;
+	rc = bios_return->res1;
+	if (rc)
+		goto err_out1;
+
+	memcpy(args, bios_return, sizeof(struct app_wmi_args));
+	rc = 0;
+
+ err_out1:
+	kfree(obj);
+ err_out0:
+	return rc;
+}
+
+static void __init find_micmute_tokens(const struct dmi_header *dm, void *dummy)
+{
+	struct dell_bios_calling_interface *calling_interface;
+	struct dell_bios_data_token *token;
+	int token_size = sizeof(struct dell_bios_data_token);
+	int i = 0;
+
+	if (dm->type == 0xda && dm->length > 17) {
+		calling_interface = container_of(dm,
+				struct dell_bios_calling_interface, header);
+
+		token = &calling_interface->damap[i];
+		while (token->tokenid != 0xffff) {
+			if (token->tokenid == GLOBAL_MIC_MUTE_DISABLE)
+				memcpy(&dell_mic_tokens[0], token, token_size);
+			else if (token->tokenid == GLOBAL_MIC_MUTE_ENABLE)
+				memcpy(&dell_mic_tokens[1], token, token_size);
+
+			i++;
+			token = &calling_interface->damap[i];
+		}
+	}
+}
+
+static int dell_micmute_led_set(int state)
+{
+	struct app_wmi_args args;
+	struct dell_bios_data_token *token;
+
+	if (!wmi_has_guid(DELL_APP_GUID))
+		return -ENODEV;
+
+	if (state == 0 || state == 1)
+		token = &dell_mic_tokens[state];
+	else
+		return -EINVAL;
+
+	memset(&args, 0, sizeof(struct app_wmi_args));
+
+	args.class = 1;
+	args.arg1 = token->location;
+	args.arg2 = token->value;
+
+	dell_wmi_perform_query(&args);
+
+	return state;
+}
+
+int dell_app_wmi_led_set(int whichled, int on)
+{
+	int state = 0;
+
+	switch (whichled) {
+	case DELL_LED_MICMUTE:
+		state = dell_micmute_led_set(on);
+		break;
+	default:
+		pr_warn("led type %x is not supported\n", whichled);
+		break;
+	}
+
+	return state;
+}
+EXPORT_SYMBOL_GPL(dell_app_wmi_led_set);
+
+static int __init dell_micmute_led_init(void)
+{
+	memset(dell_mic_tokens, 0, sizeof(struct dell_bios_data_token) * 2);
+	dmi_walk(find_micmute_tokens, NULL);
+
+	return 0;
+}
+
+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) && !wmi_has_guid(DELL_APP_GUID))
+		return -ENODEV;
+
+	if (wmi_has_guid(DELL_APP_GUID))
+		error = dell_micmute_led_init();
+
+	if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
+		error = led_off();
+		if (error != 0)
+			return -ENODEV;
+
+		error = led_classdev_register(NULL, &dell_led);
+	}
+
+	return error;
+}
+
+static void __exit dell_led_exit(void)
+{
+	int error = 0;
+
+	if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
+		error = led_off();
+		if (error == 0)
+			led_classdev_unregister(&dell_led);
+	}
+}
+
+module_init(dell_led_init);
+module_exit(dell_led_exit);