ideapad: add debugfs support

Add two nodes in debugfs which shows cfg value and its meaning,
and status info read from VPC2004.

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 152 insertions, 0 deletions

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 39a72a8aeb8c..1c8b5065f34c 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -34,6 +34,8 @@
 #include <linux/input/sparse-keymap.h>
 #include <linux/backlight.h>
 #include <linux/fb.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 
 #define IDEAPAD_RFKILL_DEV_NUM  (3)
 
@@ -71,10 +73,12 @@ struct ideapad_private {
         struct platform_device *platform_device;
         struct input_dev *inputdev;
         struct backlight_device *blightdev;
+        struct dentry *debug;
         unsigned long cfg;
 };
 
 static acpi_handle ideapad_handle;
+static struct ideapad_private *ideapad_priv;
 static bool no_bt_rfkill;
 module_param(no_bt_rfkill, bool, 0444);
 MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
@@ -188,6 +192,146 @@ static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
 }
 
 /*
+ * debugfs
+ */
+#define DEBUGFS_EVENT_LEN (4096)
+static int debugfs_status_show(struct seq_file *s, void *data)
+{
+        unsigned long value;
+
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_BL_MAX, &value))
+                seq_printf(s, "Backlight max:\t%lu\n", value);
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_BL, &value))
+                seq_printf(s, "Backlight now:\t%lu\n", value);
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_BL_POWER, &value))
+                seq_printf(s, "BL power value:\t%s\n", value ? "On" : "Off");
+        seq_printf(s, "=====================\n");
+
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_RF, &value))
+                seq_printf(s, "Radio status:\t%s(%lu)\n",
+                           value ? "On" : "Off", value);
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_WIFI, &value))
+                seq_printf(s, "Wifi status:\t%s(%lu)\n",
+                           value ? "On" : "Off", value);
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_BT, &value))
+                seq_printf(s, "BT status:\t%s(%lu)\n",
+                           value ? "On" : "Off", value);
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_3G, &value))
+                seq_printf(s, "3G status:\t%s(%lu)\n",
+                           value ? "On" : "Off", value);
+        seq_printf(s, "=====================\n");
+
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_TOUCHPAD, &value))
+                seq_printf(s, "Touchpad status:%s(%lu)\n",
+                           value ? "On" : "Off", value);
+        if (!read_ec_data(ideapad_handle, VPCCMD_R_CAMERA, &value))
+                seq_printf(s, "Camera status:\t%s(%lu)\n",
+                           value ? "On" : "Off", value);
+
+        return 0;
+}
+
+static int debugfs_status_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, debugfs_status_show, NULL);
+}
+
+static const struct file_operations debugfs_status_fops = {
+        .owner = THIS_MODULE,
+        .open = debugfs_status_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int debugfs_cfg_show(struct seq_file *s, void *data)
+{
+        if (!ideapad_priv) {
+                seq_printf(s, "cfg: N/A\n");
+        } else {
+                seq_printf(s, "cfg: 0x%.8lX\n\nCapability: ",
+                           ideapad_priv->cfg);
+                if (test_bit(CFG_BT_BIT, &ideapad_priv->cfg))
+                        seq_printf(s, "Bluetooth ");
+                if (test_bit(CFG_3G_BIT, &ideapad_priv->cfg))
+                        seq_printf(s, "3G ");
+                if (test_bit(CFG_WIFI_BIT, &ideapad_priv->cfg))
+                        seq_printf(s, "Wireless ");
+                if (test_bit(CFG_CAMERA_BIT, &ideapad_priv->cfg))
+                        seq_printf(s, "Camera ");
+                seq_printf(s, "\nGraphic: ");
+                switch ((ideapad_priv->cfg)&0x700) {
+                case 0x100:
+                        seq_printf(s, "Intel");
+                        break;
+                case 0x200:
+                        seq_printf(s, "ATI");
+                        break;
+                case 0x300:
+                        seq_printf(s, "Nvidia");
+                        break;
+                case 0x400:
+                        seq_printf(s, "Intel and ATI");
+                        break;
+                case 0x500:
+                        seq_printf(s, "Intel and Nvidia");
+                        break;
+                }
+                seq_printf(s, "\n");
+        }
+        return 0;
+}
+
+static int debugfs_cfg_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, debugfs_cfg_show, NULL);
+}
+
+static const struct file_operations debugfs_cfg_fops = {
+        .owner = THIS_MODULE,
+        .open = debugfs_cfg_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int __devinit ideapad_debugfs_init(struct ideapad_private *priv)
+{
+        struct dentry *node;
+
+        priv->debug = debugfs_create_dir("ideapad", NULL);
+        if (priv->debug == NULL) {
+                pr_err("failed to create debugfs directory");
+                goto errout;
+        }
+
+        node = debugfs_create_file("cfg", S_IRUGO, priv->debug, NULL,
+                                   &debugfs_cfg_fops);
+        if (!node) {
+                pr_err("failed to create cfg in debugfs");
+                goto errout;
+        }
+
+        node = debugfs_create_file("status", S_IRUGO, priv->debug, NULL,
+                                   &debugfs_status_fops);
+        if (!node) {
+                pr_err("failed to create event in debugfs");
+                goto errout;
+        }
+
+        return 0;
+
+errout:
+        return -ENOMEM;
+}
+
+static void ideapad_debugfs_exit(struct ideapad_private *priv)
+{
+        debugfs_remove_recursive(priv->debug);
+        priv->debug = NULL;
+}
+
+/*
  * sysfs
  */
 static ssize_t show_ideapad_cam(struct device *dev,
@@ -573,6 +717,7 @@ static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
         if (!priv)
                 return -ENOMEM;
         dev_set_drvdata(&adevice->dev, priv);
+        ideapad_priv = priv;
         ideapad_handle = adevice->handle;
         priv->cfg = cfg;
 
@@ -580,6 +725,10 @@ static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
         if (ret)
                 goto platform_failed;
 
+        ret = ideapad_debugfs_init(priv);
+        if (ret)
+                goto debugfs_failed;
+
         ret = ideapad_input_init(priv);
         if (ret)
                 goto input_failed;
@@ -605,6 +754,8 @@ backlight_failed:
                 ideapad_unregister_rfkill(adevice, i);
         ideapad_input_exit(priv);
 input_failed:
+        ideapad_debugfs_exit(priv);
+debugfs_failed:
         ideapad_platform_exit(priv);
 platform_failed:
         kfree(priv);
@@ -620,6 +771,7 @@ static int __devexit ideapad_acpi_remove(struct acpi_device *adevice, int type)
         for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++)
                 ideapad_unregister_rfkill(adevice, i);
         ideapad_input_exit(priv);
+        ideapad_debugfs_exit(priv);
         ideapad_platform_exit(priv);
         dev_set_drvdata(&adevice->dev, NULL);
         kfree(priv);