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-rw-r--r--drivers/acpi/fan.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
new file mode 100644
index 000000000000..14192ee55f8f
--- /dev/null
+++ b/drivers/acpi/fan.c
@@ -0,0 +1,302 @@
+/*
+ * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
+ *
+ * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.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; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define ACPI_FAN_COMPONENT 0x00200000
+#define ACPI_FAN_CLASS "fan"
+#define ACPI_FAN_HID "PNP0C0B"
+#define ACPI_FAN_DRIVER_NAME "ACPI Fan Driver"
+#define ACPI_FAN_DEVICE_NAME "Fan"
+#define ACPI_FAN_FILE_STATE "state"
+#define ACPI_FAN_NOTIFY_STATUS 0x80
+
+#define _COMPONENT ACPI_FAN_COMPONENT
+ACPI_MODULE_NAME ("acpi_fan")
+
+MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_DESCRIPTION(ACPI_FAN_DRIVER_NAME);
+MODULE_LICENSE("GPL");
+
+static int acpi_fan_add (struct acpi_device *device);
+static int acpi_fan_remove (struct acpi_device *device, int type);
+
+static struct acpi_driver acpi_fan_driver = {
+ .name = ACPI_FAN_DRIVER_NAME,
+ .class = ACPI_FAN_CLASS,
+ .ids = ACPI_FAN_HID,
+ .ops = {
+ .add = acpi_fan_add,
+ .remove = acpi_fan_remove,
+ },
+};
+
+struct acpi_fan {
+ acpi_handle handle;
+};
+
+
+/* --------------------------------------------------------------------------
+ FS Interface (/proc)
+ -------------------------------------------------------------------------- */
+
+static struct proc_dir_entry *acpi_fan_dir;
+
+
+static int
+acpi_fan_read_state (struct seq_file *seq, void *offset)
+{
+ struct acpi_fan *fan = seq->private;
+ int state = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_fan_read_state");
+
+ if (fan) {
+ if (acpi_bus_get_power(fan->handle, &state))
+ seq_printf(seq, "status: ERROR\n");
+ else
+ seq_printf(seq, "status: %s\n",
+ !state?"on":"off");
+ }
+ return_VALUE(0);
+}
+
+static int acpi_fan_state_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, acpi_fan_read_state, PDE(inode)->data);
+}
+
+static ssize_t
+acpi_fan_write_state (
+ struct file *file,
+ const char __user *buffer,
+ size_t count,
+ loff_t *ppos)
+{
+ int result = 0;
+ struct seq_file *m = (struct seq_file *)file->private_data;
+ struct acpi_fan *fan = (struct acpi_fan *) m->private;
+ char state_string[12] = {'\0'};
+
+ ACPI_FUNCTION_TRACE("acpi_fan_write_state");
+
+ if (!fan || (count > sizeof(state_string) - 1))
+ return_VALUE(-EINVAL);
+
+ if (copy_from_user(state_string, buffer, count))
+ return_VALUE(-EFAULT);
+
+ state_string[count] = '\0';
+
+ result = acpi_bus_set_power(fan->handle,
+ simple_strtoul(state_string, NULL, 0));
+ if (result)
+ return_VALUE(result);
+
+ return_VALUE(count);
+}
+
+static struct file_operations acpi_fan_state_ops = {
+ .open = acpi_fan_state_open_fs,
+ .read = seq_read,
+ .write = acpi_fan_write_state,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
+static int
+acpi_fan_add_fs (
+ struct acpi_device *device)
+{
+ struct proc_dir_entry *entry = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_fan_add_fs");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ if (!acpi_device_dir(device)) {
+ acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+ acpi_fan_dir);
+ if (!acpi_device_dir(device))
+ return_VALUE(-ENODEV);
+ acpi_device_dir(device)->owner = THIS_MODULE;
+ }
+
+ /* 'status' [R/W] */
+ entry = create_proc_entry(ACPI_FAN_FILE_STATE,
+ S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Unable to create '%s' fs entry\n",
+ ACPI_FAN_FILE_STATE));
+ else {
+ entry->proc_fops = &acpi_fan_state_ops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;
+ }
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_fan_remove_fs (
+ struct acpi_device *device)
+{
+ ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
+
+ if (acpi_device_dir(device)) {
+ remove_proc_entry(ACPI_FAN_FILE_STATE,
+ acpi_device_dir(device));
+ remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
+ acpi_device_dir(device) = NULL;
+ }
+
+ return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ Driver Interface
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_fan_add (
+ struct acpi_device *device)
+{
+ int result = 0;
+ struct acpi_fan *fan = NULL;
+ int state = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_fan_add");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ fan = kmalloc(sizeof(struct acpi_fan), GFP_KERNEL);
+ if (!fan)
+ return_VALUE(-ENOMEM);
+ memset(fan, 0, sizeof(struct acpi_fan));
+
+ fan->handle = device->handle;
+ strcpy(acpi_device_name(device), ACPI_FAN_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_FAN_CLASS);
+ acpi_driver_data(device) = fan;
+
+ result = acpi_bus_get_power(fan->handle, &state);
+ if (result) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error reading power state\n"));
+ goto end;
+ }
+
+ result = acpi_fan_add_fs(device);
+ if (result)
+ goto end;
+
+ printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
+ acpi_device_name(device), acpi_device_bid(device),
+ !device->power.state?"on":"off");
+
+end:
+ if (result)
+ kfree(fan);
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_fan_remove (
+ struct acpi_device *device,
+ int type)
+{
+ struct acpi_fan *fan = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_fan_remove");
+
+ if (!device || !acpi_driver_data(device))
+ return_VALUE(-EINVAL);
+
+ fan = (struct acpi_fan *) acpi_driver_data(device);
+
+ acpi_fan_remove_fs(device);
+
+ kfree(fan);
+
+ return_VALUE(0);
+}
+
+
+static int __init
+acpi_fan_init (void)
+{
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_fan_init");
+
+ acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
+ if (!acpi_fan_dir)
+ return_VALUE(-ENODEV);
+ acpi_fan_dir->owner = THIS_MODULE;
+
+ result = acpi_bus_register_driver(&acpi_fan_driver);
+ if (result < 0) {
+ remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
+ return_VALUE(-ENODEV);
+ }
+
+ return_VALUE(0);
+}
+
+
+static void __exit
+acpi_fan_exit (void)
+{
+ ACPI_FUNCTION_TRACE("acpi_fan_exit");
+
+ acpi_bus_unregister_driver(&acpi_fan_driver);
+
+ remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
+
+ return_VOID;
+}
+
+
+module_init(acpi_fan_init);
+module_exit(acpi_fan_exit);
+