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Date: Sat, 26 Nov 2011 11:00:03 +0100
From: Corentin Chary <corentincj@...aif.net>
To: platform-driver-x86@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...e.de>,
Matthew Garrett <mjg@...hat.com>,
Corentin Chary <corentincj@...aif.net>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/16] samsung-laptop: add a small debugfs interface
This allow to call arbitrary sabi commands wihout
modifying the driver at all. For example, setting
the keyboard backlight brightness to 5 using debugfs
interface can be done like that:
; Set the command
echo 0x78 > command
; Set the data
echo 0x0582 > d0
; Fill the rest with 0
echo 0 > d1
echo 0 > d2
echo 0 > d3
; And issue the command
cat call
Signed-off-by: Corentin Chary <corentincj@...aif.net>
Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
---
drivers/platform/x86/samsung-laptop.c | 147 +++++++++++++++++++++++++++++++++
1 files changed, 147 insertions(+), 0 deletions(-)
diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index cd638c4..6cbf2ed 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -22,6 +22,8 @@
#include <linux/platform_device.h>
#include <linux/rfkill.h>
#include <linux/acpi.h>
+#include <linux/seq_file.h>
+#include <linux/debugfs.h>
/*
* This driver is needed because a number of Samsung laptops do not hook
@@ -226,6 +228,35 @@ static const struct sabi_config sabi_configs[] = {
{ },
};
+/*
+ * samsung-laptop/ - debugfs root directory
+ * f0000_segment - dump f0000 segment
+ * command - current command
+ * data - current data
+ * d0, d1, d2, d3 - data fields
+ * call - call SABI using command and data
+ *
+ * This allow to call arbitrary sabi commands wihout
+ * modifying the driver at all.
+ * For example, setting the keyboard backlight brightness to 5
+ *
+ * echo 0x78 > command
+ * echo 0x0582 > d0
+ * echo 0 > d1
+ * echo 0 > d2
+ * echo 0 > d3
+ * cat call
+ */
+
+struct samsung_laptop_debug {
+ struct dentry *root;
+ struct sabi_data data;
+ u16 command;
+
+ struct debugfs_blob_wrapper f0000_wrapper;
+ struct debugfs_blob_wrapper data_wrapper;
+};
+
struct samsung_laptop {
const struct sabi_config *config;
@@ -239,6 +270,8 @@ struct samsung_laptop {
struct backlight_device *backlight_device;
struct rfkill *rfk;
+ struct samsung_laptop_debug debug;
+
bool handle_backlight;
bool has_stepping_quirk;
};
@@ -680,6 +713,113 @@ static int __init samsung_sysfs_init(struct samsung_laptop *samsung)
}
+static int show_call(struct seq_file *m, void *data)
+{
+ struct samsung_laptop *samsung = m->private;
+ struct sabi_data *sdata = &samsung->debug.data;
+ int ret;
+
+ seq_printf(m, "SABI 0x%04x {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
+ samsung->debug.command,
+ sdata->d0, sdata->d1, sdata->d2, sdata->d3);
+
+ ret = sabi_command(samsung, samsung->debug.command, sdata, sdata);
+
+ if (ret) {
+ seq_printf(m, "SABI command 0x%04x failed\n",
+ samsung->debug.command);
+ return ret;
+ }
+
+ seq_printf(m, "SABI {0x%08x, 0x%08x, 0x%04x, 0x%02x}\n",
+ sdata->d0, sdata->d1, sdata->d2, sdata->d3);
+ return 0;
+}
+
+static int samsung_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, show_call, inode->i_private);
+}
+
+static const struct file_operations samsung_laptop_call_io_ops = {
+ .owner = THIS_MODULE,
+ .open = samsung_debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void samsung_debugfs_exit(struct samsung_laptop *samsung)
+{
+ debugfs_remove_recursive(samsung->debug.root);
+}
+
+static int samsung_debugfs_init(struct samsung_laptop *samsung)
+{
+ struct dentry *dent;
+
+ samsung->debug.root = debugfs_create_dir("samsung-laptop", NULL);
+ if (!samsung->debug.root) {
+ pr_err("failed to create debugfs directory");
+ goto error_debugfs;
+ }
+
+ samsung->debug.f0000_wrapper.data = samsung->f0000_segment;
+ samsung->debug.f0000_wrapper.size = 0xffff;
+
+ samsung->debug.data_wrapper.data = &samsung->debug.data;
+ samsung->debug.data_wrapper.size = sizeof(samsung->debug.data);
+
+ dent = debugfs_create_u16("command", S_IRUGO | S_IWUSR,
+ samsung->debug.root, &samsung->debug.command);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_u32("d0", S_IRUGO | S_IWUSR, samsung->debug.root,
+ &samsung->debug.data.d0);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_u32("d1", S_IRUGO | S_IWUSR, samsung->debug.root,
+ &samsung->debug.data.d1);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_u16("d2", S_IRUGO | S_IWUSR, samsung->debug.root,
+ &samsung->debug.data.d2);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_u8("d3", S_IRUGO | S_IWUSR, samsung->debug.root,
+ &samsung->debug.data.d3);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_blob("data", S_IRUGO | S_IWUSR,
+ samsung->debug.root,
+ &samsung->debug.data_wrapper);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_blob("f0000_segment", S_IRUSR | S_IWUSR,
+ samsung->debug.root,
+ &samsung->debug.f0000_wrapper);
+ if (!dent)
+ goto error_debugfs;
+
+ dent = debugfs_create_file("call", S_IFREG | S_IRUGO,
+ samsung->debug.root, samsung,
+ &samsung_laptop_call_io_ops);
+ if (!dent)
+ goto error_debugfs;
+
+ return 0;
+
+error_debugfs:
+ samsung_debugfs_exit(samsung);
+ return -ENOMEM;
+}
+
static void samsung_sabi_exit(struct samsung_laptop *samsung)
{
const struct sabi_config *config = samsung->config;
@@ -1123,9 +1263,15 @@ static int __init samsung_init(void)
if (ret)
goto error_rfkill;
+ ret = samsung_debugfs_init(samsung);
+ if (ret)
+ goto error_debugfs;
+
samsung_platform_device = samsung->platform_device;
return ret;
+error_debugfs:
+ samsung_rfkill_exit(samsung);
error_rfkill:
samsung_backlight_exit(samsung);
error_backlight:
@@ -1145,6 +1291,7 @@ static void __exit samsung_exit(void)
samsung = platform_get_drvdata(samsung_platform_device);
+ samsung_debugfs_exit(samsung);
samsung_rfkill_exit(samsung);
samsung_backlight_exit(samsung);
samsung_sysfs_exit(samsung);
--
1.7.5.4
--
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