Add debug file

Provide debug file to report temperature register settings and values.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/nct6775.c b/nct6775.c
index 5f448f320982409e1315f4c57307d0fadae514d4..64855db20b0adbe58ad48b22bd932e15ba4d3a87 100644 (file)
--- a/nct6775.c
+++ b/nct6775.c
@@ -62,6 +62,7 @@
 #include <linux/bitops.h>
 #include <linux/dmi.h>
 #include <linux/io.h>
+#include <linux/debugfs.h>
 #include "lm75.h"
 #include "compat.h"
 
@@ -1070,6 +1071,88 @@ struct nct6775_sio_data {
        enum kinds kind;
 };
 
+#ifdef CONFIG_DEBUG_FS
+
+static u16 nct6775_read_temp(struct nct6775_data *data, u16 reg);
+static u16 nct6775_read_value(struct nct6775_data *data, u16 reg);
+
+static const char *temp_attr_names[5] = {
+       "input",
+       "max",
+       "hyst",
+       "crit",
+       "lcrit",
+};
+
+static int nct6775_seq_show(struct seq_file *s, void *v)
+{
+       struct device *dev = (struct device *)s->private;
+       struct nct6775_data *data = dev_get_drvdata(dev);
+       int i, j;
+
+       seq_printf(s, "Temperatures:\n");
+       for (i = 0; i < NUM_TEMP; i++) {
+               if (!(data->have_temp & BIT(i)))
+                       continue;
+               seq_printf(s, "  temp%d [source %d, %s]:\n", i + 1,
+                          data->temp_src[i],
+                          data->temp_label[data->temp_src[i]]);
+               for (j = 0; j < ARRAY_SIZE(data->reg_temp); j++) {
+                       if (data->reg_temp[j][i]) {
+                               seq_printf(s, "    %s: reg=0x%x val=0x%x cached 0x%x\n",
+                                          temp_attr_names[j],
+                                          data->reg_temp[j][i],
+                                          nct6775_read_temp(data, data->reg_temp[j][i]),
+                                          (u16)data->temp[j][i]);
+                       }
+               }
+       }
+       seq_printf(s, "Temperature sources:\n");
+       for (i = 0; i < data->num_temp_alarms; i++) {
+               seq_printf(s, "  index %d register 0x%x: val=0x%x\n",
+                          i, data->REG_TEMP_SOURCE[i],
+                          nct6775_read_value(data, data->REG_TEMP_SOURCE[i]) & 0x1f);
+       }
+       return 0;
+}
+
+static int nct6775_debug_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, nct6775_seq_show, inode->i_private);
+}
+
+static const struct file_operations nct6775_debug_operations = {
+       .open           = nct6775_debug_open,
+       .llseek         = seq_lseek,
+       .read           = seq_read,
+       .release        = single_release,
+};
+
+static void nct6775_debugfs_exit(void *data)
+{
+        debugfs_remove_recursive(data);
+}
+
+static int nct6775_debugfs_init(struct device *dev)
+{
+       struct dentry *rootdir;
+
+       rootdir = debugfs_create_dir(dev_name(dev), NULL);
+       if (!rootdir)
+               return -ENOMEM;
+
+       devm_add_action(dev, nct6775_debugfs_exit, rootdir);
+
+       debugfs_create_file("registers", S_IFREG | 0444, rootdir,
+                           dev, &nct6775_debug_operations);
+
+       return 0;
+}
+
+#else
+static int nct6775_debugfs_init(struct device *dev) { return 0; }
+#endif
+
 struct sensor_device_template {
        struct device_attribute dev_attr;
        union {
@@ -4270,6 +4353,8 @@ static int nct6775_probe(struct platform_device *pdev)
 #else
        hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
                                                           data, data->groups);
+       if (!IS_ERR(hwmon_dev))
+               nct6775_debugfs_init(hwmon_dev);
 #endif
        return PTR_ERR_OR_ZERO(hwmon_dev);
 }