Subject: [PATCH] [acpi driver model] Add New AC Driver

- Include base driver:
  - Registration
  - Simple device access (for acquiring state)
  - Kconfig option

Signed-off-by: Patrick Mochel <mochel@linux.intel.com>

---

 drivers/acpi/drivers/ac/Kconfig  |    9 ++++++
 drivers/acpi/drivers/ac/Makefile |    4 ++
 drivers/acpi/drivers/ac/ac.h     |   20 ++++++++++++
 drivers/acpi/drivers/ac/device.c |   31 +++++++++++++++++++
 drivers/acpi/drivers/ac/driver.c |   61 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 125 insertions(+), 0 deletions(-)
 create mode 100644 drivers/acpi/drivers/ac/Kconfig
 create mode 100644 drivers/acpi/drivers/ac/Makefile
 create mode 100644 drivers/acpi/drivers/ac/ac.h
 create mode 100644 drivers/acpi/drivers/ac/device.c
 create mode 100644 drivers/acpi/drivers/ac/driver.c

applies-to: 19c872a70960e22ef0c9ffc8f064fe94ce34e52f
6713a099eaa5de8cec2ea12bc27accbc709955aa
diff --git a/drivers/acpi/drivers/ac/Kconfig b/drivers/acpi/drivers/ac/Kconfig
new file mode 100644
index 0000000..3afdd4c
--- /dev/null
+++ b/drivers/acpi/drivers/ac/Kconfig
@@ -0,0 +1,9 @@
+config ACPI_AC
+	tristate "AC Adapter"
+	depends on ACPI_DM && X86
+	default y
+	help
+	  This driver adds support for the AC Adapter object, which indicates
+	  whether a system is on AC, or not. If you have a system that can
+	  switch between A/C and battery, say Y.
+
diff --git a/drivers/acpi/drivers/ac/Makefile b/drivers/acpi/drivers/ac/Makefile
new file mode 100644
index 0000000..2e12353
--- /dev/null
+++ b/drivers/acpi/drivers/ac/Makefile
@@ -0,0 +1,4 @@
+obj-$(CONFIG_ACPI_AC)	+= ac.o
+
+ac-y			:= driver.o device.o
+
diff --git a/drivers/acpi/drivers/ac/ac.h b/drivers/acpi/drivers/ac/ac.h
new file mode 100644
index 0000000..b175dec
--- /dev/null
+++ b/drivers/acpi/drivers/ac/ac.h
@@ -0,0 +1,20 @@
+
+#define err(fmt, ...) printk(PREFIX "ac: " fmt "\n", ## __VA_ARGS__)
+
+
+#define _COMPONENT	ACPI_AC_COMPONENT
+ACPI_MODULE_NAME("acpi_ac");
+
+#define ACPI_AC_HID	"ACPI0003"
+
+#define AC_STATE_OFFLINE	0x00
+#define AC_STATE_ONLINE		0x01
+#define AC_STATUS_UNKNOWN	0xff
+
+struct acpi_ac {
+	struct acpi_dev		* a_ad;
+	unsigned long		a_state;
+};
+
+
+extern int ac_get_state(struct acpi_ac * ac);
diff --git a/drivers/acpi/drivers/ac/device.c b/drivers/acpi/drivers/ac/device.c
new file mode 100644
index 0000000..7da4fc4
--- /dev/null
+++ b/drivers/acpi/drivers/ac/device.c
@@ -0,0 +1,31 @@
+/**
+ *
+ * drivers/acpi/drivers/ac/device.c - low-level device access (via AML)
+ *
+ * Copyright (C) 2005 Patrick Mochel
+ * 
+ * Based on drivers/acpi/ac.c, which was: 
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <acpi/device.h>
+#include "ac.h"
+
+
+int ac_get_state(struct acpi_ac * ac)
+{
+	acpi_status status;
+	int ret = 0;
+
+	status = acpi_evaluate_integer(ac->a_ad->acpi_device->handle,
+				       "_PSR", NULL, &ac->a_state);
+	if (ACPI_FAILURE(status)) {
+		err("Unable to read AC Adapter state");
+		ret = -ENODEV;
+	}
+	return ret;
+}
diff --git a/drivers/acpi/drivers/ac/driver.c b/drivers/acpi/drivers/ac/driver.c
new file mode 100644
index 0000000..90aa48e
--- /dev/null
+++ b/drivers/acpi/drivers/ac/driver.c
@@ -0,0 +1,61 @@
+/*
+ *	drivers/acpi/drivers/ac.c - New-style ACPI driver ac
+ *
+ *	Copyright (C) 2005 Patrick Mochel
+ *
+ *	This file is released under the GPLv2.
+ *
+ */
+
+#include <acpi/driver.h>
+#include "ac.h"
+
+static int ac_add(struct acpi_dev * ad)
+{
+	struct acpi_ac * ac;
+	int ret = 0;
+
+	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
+	if (!ac)
+		return -ENOMEM;
+
+	ac->a_ad = ad;
+	ac->a_state = AC_STATUS_UNKNOWN;
+
+	ret = ac_get_state(ac);
+	if (ret) {
+		kfree(ac);
+		return ret;
+	}
+
+	dev_set_drvdata(&ad->dev, ac);
+
+	printk(KERN_INFO PREFIX "ac [%s] (%s)\n",
+	       acpi_dev_bid(ad),
+	       ac->a_state ? "on-line" : "off-line");
+
+	return 0;
+}
+
+static int ac_remove(struct acpi_dev * ad)
+{	
+	struct acpi_ac * ac = dev_get_drvdata(&ad->dev);
+
+	dev_set_drvdata(&ad->dev, NULL);
+	kfree(ac);
+	return 0;
+}
+
+
+acpi_no_start(ac);
+acpi_no_stop(ac);
+acpi_no_shutdown(ac);
+acpi_no_suspend(ac);
+acpi_no_resume(ac);
+
+declare_acpi_driver(ac, ACPI_AC_HID);
+
+
+MODULE_AUTHOR("Patrick Mochel");
+MODULE_DESCRIPTION("ACPI AC Driver");
+MODULE_LICENSE("GPL");
---
0.99.9.GIT