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Next: [PATCH 7/7] Documentation: Add new /sys/kernel/debug/ec/* files to ABI
From: Thomas Renninger on 16 Jul 2010 07:20
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(a)suse.de>
CC: Alexey Starikovskiy <astarikovskiy(a)suse.de>
CC: Len Brown <lenb(a)kernel.org>
CC: linux-kernel(a)vger.kernel.org
CC: linux-acpi(a)vger.kernel.org
CC: platform-driver-x86(a)vger.kernel.org
---
drivers/acpi/ec_sys.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 86 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index 834c21a..3ef9781 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(a)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(a)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;
}

--
1.6.3

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Prev: [PATCH 6/7] X86 platform driver: Fix section mismatch in wmi.c
Next: [PATCH 7/7] Documentation: Add new /sys/kernel/debug/ec/* files to ABI