1 files changed, 160 insertions, 0 deletions

diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
new file mode 100644
index 00000000000..0e869b3f81c
--- /dev/null
+++ b/drivers/acpi/ec_sys.c
@@ -0,0 +1,160 @@
+/*
+ * ec_sys.c
+ *
+ * Copyright (C) 2010 SUSE Products GmbH/Novell
+ * Author:
+ *      Thomas Renninger <trenn@suse.de>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/debugfs.h>
+#include "internal.h"
+
+MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
+MODULE_DESCRIPTION("ACPI EC sysfs access driver");
+MODULE_LICENSE("GPL");
+
+static bool write_support;
+module_param(write_support, bool, 0644);
+MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may "
+                 "be needed.");
+
+#define EC_SPACE_SIZE 256
+
+struct sysdev_class acpi_ec_sysdev_class = {
+        .name = "ec",
+};
+
+static struct dentry *acpi_ec_debugfs_dir;
+
+static int acpi_ec_open_io(struct inode *i, struct file *f)
+{
+        f->private_data = i->i_private;
+        return 0;
+}
+
+static ssize_t acpi_ec_read_io(struct file *f, char __user *buf,
+                               size_t count, loff_t *off)
+{
+        /* Use this if support reading/writing multiple ECs exists in ec.c:
+         * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
+         */
+        unsigned int size = EC_SPACE_SIZE;
+        u8 *data = (u8 *) buf;
+        loff_t init_off = *off;
+        int err = 0;
+
+        if (*off >= size)
+                return 0;
+        if (*off + count >= size) {
+                size -= *off;
+                count = size;
+        } else
+                size = count;
+
+        while (size) {
+                err = ec_read(*off, &data[*off - init_off]);
+                if (err)
+                        return err;
+                *off += 1;
+                size--;
+        }
+        return count;
+}
+
+static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf,
+                                size_t count, loff_t *off)
+{
+        /* Use this if support reading/writing multiple ECs exists in ec.c:
+         * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private;
+         */
+
+        unsigned int size = count;
+        loff_t init_off = *off;
+        u8 *data = (u8 *) buf;
+        int err = 0;
+
+        if (*off >= EC_SPACE_SIZE)
+                return 0;
+        if (*off + count >= EC_SPACE_SIZE) {
+                size = EC_SPACE_SIZE - *off;
+                count = size;
+        }
+
+        while (size) {
+                u8 byte_write = data[*off - init_off];
+                err = ec_write(*off, byte_write);
+                if (err)
+                        return err;
+
+                *off += 1;
+                size--;
+        }
+        return count;
+}
+
+static struct file_operations acpi_ec_io_ops = {
+        .owner = THIS_MODULE,
+        .open  = acpi_ec_open_io,
+        .read  = acpi_ec_read_io,
+        .write = acpi_ec_write_io,
+};
+
+int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
+{
+        struct dentry *dev_dir;
+        char name[64];
+        mode_t mode = 0400;
+
+        if (ec_device_count == 0) {
+                acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
+                if (!acpi_ec_debugfs_dir)
+                        return -ENOMEM;
+        }
+
+        sprintf(name, "ec%u", ec_device_count);
+        dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
+        if (!dev_dir) {
+                if (ec_device_count != 0)
+                        goto error;
+                return -ENOMEM;
+        }
+
+        if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe))
+                goto error;
+        if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
+                                 (u32 *)&first_ec->global_lock))
+                goto error;
+
+        if (write_support)
+                mode = 0600;
+        if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
+                goto error;
+
+        return 0;
+
+error:
+        debugfs_remove_recursive(acpi_ec_debugfs_dir);
+        return -ENOMEM;
+}
+
+static int __init acpi_ec_sys_init(void)
+{
+        int err = 0;
+        if (first_ec)
+                err = acpi_ec_add_debugfs(first_ec, 0);
+        else
+                err = -ENODEV;
+        return err;
+}
+
+static void __exit acpi_ec_sys_exit(void)
+{
+        debugfs_remove_recursive(acpi_ec_debugfs_dir);
+}
+
+module_init(acpi_ec_sys_init);
+module_exit(acpi_ec_sys_exit);