V4L/DVB (8899): pvrusb2: Implement default value retrieval in sysfs interface

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-sysfs.c b/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
index 46a8c39ba030..ac01b11f7b99 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
@@ -65,6 +65,7 @@ struct pvr2_sysfs_ctl_item {
         struct device_attribute attr_type;
         struct device_attribute attr_min;
         struct device_attribute attr_max;
+        struct device_attribute attr_def;
         struct device_attribute attr_enum;
         struct device_attribute attr_bits;
         struct device_attribute attr_val;
@@ -145,6 +146,24 @@ static ssize_t show_max(struct device *class_dev,
         return scnprintf(buf, PAGE_SIZE, "%ld\n", val);
 }
 
+static ssize_t show_def(struct device *class_dev,
+                        struct device_attribute *attr,
+                        char *buf)
+{
+        struct pvr2_sysfs_ctl_item *cip;
+        int val;
+        int ret;
+        cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_def);
+        ret = pvr2_ctrl_get_def(cip->cptr, &val);
+        pvr2_sysfs_trace("pvr2_sysfs(%p) show_def(cid=%d) is %d, stat=%d",
+                         cip->chptr, cip->ctl_id, val, ret);
+        if (ret < 0) {
+                /* Keep checkpatch.pl quiet */
+                return ret;
+        }
+        return scnprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
 static ssize_t show_val_norm(struct device *class_dev,
                              struct device_attribute *attr,
                              char *buf)
@@ -320,6 +339,10 @@ static void pvr2_sysfs_add_control(struct pvr2_sysfs *sfp,int ctl_id)
         cip->attr_max.attr.mode = S_IRUGO;
         cip->attr_max.show = show_max;
 
+        cip->attr_def.attr.name = "def_val";
+        cip->attr_def.attr.mode = S_IRUGO;
+        cip->attr_def.show = show_def;
+
         cip->attr_val.attr.name = "cur_val";
         cip->attr_val.attr.mode = S_IRUGO;
 
@@ -343,6 +366,7 @@ static void pvr2_sysfs_add_control(struct pvr2_sysfs *sfp,int ctl_id)
         cip->attr_gen[acnt++] = &cip->attr_name.attr;
         cip->attr_gen[acnt++] = &cip->attr_type.attr;
         cip->attr_gen[acnt++] = &cip->attr_val.attr;
+        cip->attr_gen[acnt++] = &cip->attr_def.attr;
         cip->attr_val.show = show_val_norm;
         cip->attr_val.store = store_val_norm;
         if (pvr2_ctrl_has_custom_symbols(cptr)) {