ACPI: Provide /sys/kernel/debug//ec/ec0/io for binary access to the EC

A userspace app to easily read/write the EC can be found here:
ftp://ftp.suse.com/pub/people/trenn/sources/ec/ec_access.c

Multiple ECs are not supported, but shouldn't be hard to add as soon
as the ec driver itself will support them.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: Alexey Starikovskiy <astarikovskiy@suse.de>
CC: Len Brown <lenb@kernel.org>
CC: linux-kernel@vger.kernel.org
CC: linux-acpi@vger.kernel.org
CC: platform-driver-x86@vger.kernel.org
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index 834c21a42d67..3ef978185c73 100644
--- a/drivers/acpi/ec_sys.c
+++ b/drivers/acpi/ec_sys.c
@@ -1,3 +1,13 @@
+/*
+ * 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>
@@ -7,12 +17,87 @@ MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
 MODULE_DESCRIPTION("ACPI EC sysfs access driver");
 MODULE_LICENSE("GPL");
 
+#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;
@@ -35,6 +120,7 @@ int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
         debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe);
         debugfs_create_bool("use_global_lock", 0444, dev_dir,
                             (u32 *)&first_ec->global_lock);
+        debugfs_create_file("io", 0666, dev_dir, ec, &acpi_ec_io_ops);
         return 0;
 }