V4L/DVB (6695): pvrusb2: Implement functions to pass descriptive hardware info

Implement additional pvrusb2 device info table entries for a device
identifier and a device description.  Export this information via the
driver's internal API.  Make this information available via the sysfs
driver interface.  Also propagate this information into the v4l2
capability structure.  An app can now retrieve and report a
descriptive string about the particular type of hardware device it is
operating.

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

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/media/video/pvrusb2/pvrusb2-sysfs.c b/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
index 3c57a7d8200b..7a1cd878e31a 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-sysfs.c
@@ -43,10 +43,14 @@ struct pvr2_sysfs {
         struct device_attribute attr_v4l_radio_minor_number;
         struct device_attribute attr_unit_number;
         struct device_attribute attr_bus_info;
+        struct device_attribute attr_hdw_name;
+        struct device_attribute attr_hdw_desc;
         int v4l_minor_number_created_ok;
         int v4l_radio_minor_number_created_ok;
         int unit_number_created_ok;
         int bus_info_created_ok;
+        int hdw_name_created_ok;
+        int hdw_desc_created_ok;
 };
 
 #ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
@@ -712,6 +716,14 @@ static void class_dev_destroy(struct pvr2_sysfs *sfp)
         pvr2_sysfs_tear_down_debugifc(sfp);
 #endif /* CONFIG_VIDEO_PVRUSB2_DEBUGIFC */
         pvr2_sysfs_tear_down_controls(sfp);
+        if (sfp->hdw_desc_created_ok) {
+                device_remove_file(sfp->class_dev,
+                                   &sfp->attr_hdw_desc);
+        }
+        if (sfp->hdw_name_created_ok) {
+                device_remove_file(sfp->class_dev,
+                                   &sfp->attr_hdw_name);
+        }
         if (sfp->bus_info_created_ok) {
                 device_remove_file(sfp->class_dev,
                                          &sfp->attr_bus_info);
@@ -758,6 +770,28 @@ static ssize_t bus_info_show(struct device *class_dev,
 }
 
 
+static ssize_t hdw_name_show(struct device *class_dev,
+                             struct device_attribute *attr, char *buf)
+{
+        struct pvr2_sysfs *sfp;
+        sfp = (struct pvr2_sysfs *)class_dev->driver_data;
+        if (!sfp) return -EINVAL;
+        return scnprintf(buf,PAGE_SIZE,"%s\n",
+                         pvr2_hdw_get_type(sfp->channel.hdw));
+}
+
+
+static ssize_t hdw_desc_show(struct device *class_dev,
+                             struct device_attribute *attr, char *buf)
+{
+        struct pvr2_sysfs *sfp;
+        sfp = (struct pvr2_sysfs *)class_dev->driver_data;
+        if (!sfp) return -EINVAL;
+        return scnprintf(buf,PAGE_SIZE,"%s\n",
+                         pvr2_hdw_get_desc(sfp->channel.hdw));
+}
+
+
 static ssize_t v4l_radio_minor_number_show(struct device *class_dev,
                                            struct device_attribute *attr,
                                            char *buf)
@@ -871,6 +905,32 @@ static void class_dev_create(struct pvr2_sysfs *sfp,
                 sfp->bus_info_created_ok = !0;
         }
 
+        sfp->attr_hdw_name.attr.name = "device_hardware_type";
+        sfp->attr_hdw_name.attr.mode = S_IRUGO;
+        sfp->attr_hdw_name.show = hdw_name_show;
+        sfp->attr_hdw_name.store = NULL;
+        ret = device_create_file(sfp->class_dev,
+                                 &sfp->attr_hdw_name);
+        if (ret < 0) {
+                printk(KERN_WARNING "%s: device_create_file error: %d\n",
+                       __FUNCTION__, ret);
+        } else {
+                sfp->hdw_name_created_ok = !0;
+        }
+
+        sfp->attr_hdw_desc.attr.name = "device_hardware_description";
+        sfp->attr_hdw_desc.attr.mode = S_IRUGO;
+        sfp->attr_hdw_desc.show = hdw_desc_show;
+        sfp->attr_hdw_desc.store = NULL;
+        ret = device_create_file(sfp->class_dev,
+                                 &sfp->attr_hdw_desc);
+        if (ret < 0) {
+                printk(KERN_WARNING "%s: device_create_file error: %d\n",
+                       __FUNCTION__, ret);
+        } else {
+                sfp->hdw_desc_created_ok = !0;
+        }
+
         pvr2_sysfs_add_controls(sfp);
 #ifdef CONFIG_VIDEO_PVRUSB2_DEBUGIFC
         pvr2_sysfs_add_debugifc(sfp);