From 2eb563b7e726b517ef86213df436f50ec6c1740c Mon Sep 17 00:00:00 2001
From: Mike Isely <isely@pobox.com>
Date: Sun, 8 Mar 2009 18:25:46 -0300
Subject: [PATCH] V4L/DVB (11203): pvrusb2: Implement better reporting on
 attached sub-devices

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/media/video/pvrusb2/pvrusb2-hdw.c | 115 ++++++++++++++++------
 1 file changed, 86 insertions(+), 29 deletions(-)

diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
index 0cfe0eec34ea..b0383153e3ce 100644
--- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c
@@ -4876,38 +4876,82 @@ static unsigned int pvr2_hdw_report_unlocked(struct pvr2_hdw *hdw,int which,
 			stats.buffers_processed,
 			stats.buffers_failed);
 	}
-	case 6: {
-		struct v4l2_subdev *sd;
-		unsigned int tcnt = 0;
-		unsigned int ccnt;
-		const char *p;
-		unsigned int id;
-		ccnt = scnprintf(buf,
-				 acnt,
-				 "Associated v4l2_subdev drivers:");
+	default: break;
+	}
+	return 0;
+}
+
+
+/* Generate report containing info about attached sub-devices and attached
+   i2c clients, including an indication of which attached i2c clients are
+   actually sub-devices. */
+static unsigned int pvr2_hdw_report_clients(struct pvr2_hdw *hdw,
+					    char *buf, unsigned int acnt)
+{
+	struct v4l2_subdev *sd;
+	unsigned int tcnt = 0;
+	unsigned int ccnt;
+	struct i2c_client *client;
+	struct list_head *item;
+	void *cd;
+	const char *p;
+	unsigned int id;
+
+	ccnt = scnprintf(buf, acnt, "Associated v4l2-subdev drivers:");
+	tcnt += ccnt;
+	v4l2_device_for_each_subdev(sd, &hdw->v4l2_dev) {
+		id = sd->grp_id;
+		p = NULL;
+		if (id < ARRAY_SIZE(module_names)) p = module_names[id];
+		if (p) {
+			ccnt = scnprintf(buf + tcnt, acnt - tcnt, " %s", p);
+			tcnt += ccnt;
+		} else {
+			ccnt = scnprintf(buf + tcnt, acnt - tcnt,
+					 " (unknown id=%u)", id);
+			tcnt += ccnt;
+		}
+	}
+	ccnt = scnprintf(buf + tcnt, acnt - tcnt, "\n");
+	tcnt += ccnt;
+
+	ccnt = scnprintf(buf + tcnt, acnt - tcnt, "I2C clients:\n");
+	tcnt += ccnt;
+
+	mutex_lock(&hdw->i2c_adap.clist_lock);
+	list_for_each(item, &hdw->i2c_adap.clients) {
+		client = list_entry(item, struct i2c_client, list);
+		ccnt = scnprintf(buf + tcnt, acnt - tcnt,
+				 "  %s: i2c=%02x", client->name, client->addr);
 		tcnt += ccnt;
+		cd = i2c_get_clientdata(client);
 		v4l2_device_for_each_subdev(sd, &hdw->v4l2_dev) {
-			id = sd->grp_id;
-			p = NULL;
-			if (id < ARRAY_SIZE(module_names)) {
-				p = module_names[id];
-			}
-			if (p) {
-				ccnt = scnprintf(buf + tcnt,
-						 acnt - tcnt,
-						 " %s", p);
-			} else {
-				ccnt = scnprintf(buf + tcnt,
-						 acnt - tcnt,
-						 " (unknown id=%u)", id);
+			if (cd == sd) {
+				id = sd->grp_id;
+				p = NULL;
+				if (id < ARRAY_SIZE(module_names)) {
+					p = module_names[id];
+				}
+				if (p) {
+					ccnt = scnprintf(buf + tcnt,
+							 acnt - tcnt,
+							 " subdev=%s", p);
+					tcnt += ccnt;
+				} else {
+					ccnt = scnprintf(buf + tcnt,
+							 acnt - tcnt,
+							 " subdev= id %u)",
+							 id);
+					tcnt += ccnt;
+				}
+				break;
 			}
-			tcnt += ccnt;
 		}
-		return tcnt;
-	}
-	default: break;
+		ccnt = scnprintf(buf + tcnt, acnt - tcnt, "\n");
+		tcnt += ccnt;
 	}
-	return 0;
+	mutex_unlock(&hdw->i2c_adap.clist_lock);
+	return tcnt;
 }
 
 
@@ -4925,6 +4969,8 @@ unsigned int pvr2_hdw_state_report(struct pvr2_hdw *hdw,
 		buf[0] = '\n'; ccnt = 1;
 		bcnt += ccnt; acnt -= ccnt; buf += ccnt;
 	}
+	ccnt = pvr2_hdw_report_clients(hdw, buf, acnt);
+	bcnt += ccnt; acnt -= ccnt; buf += ccnt;
 	LOCK_GIVE(hdw->big_lock);
 	return bcnt;
 }
@@ -4932,14 +4978,25 @@ unsigned int pvr2_hdw_state_report(struct pvr2_hdw *hdw,
 
 static void pvr2_hdw_state_log_state(struct pvr2_hdw *hdw)
 {
-	char buf[128];
-	unsigned int idx,ccnt;
+	char buf[256];
+	unsigned int idx, ccnt;
+	unsigned int lcnt, ucnt;
 
 	for (idx = 0; ; idx++) {
 		ccnt = pvr2_hdw_report_unlocked(hdw,idx,buf,sizeof(buf));
 		if (!ccnt) break;
 		printk(KERN_INFO "%s %.*s\n",hdw->name,ccnt,buf);
 	}
+	ccnt = pvr2_hdw_report_clients(hdw, buf, sizeof(buf));
+	ucnt = 0;
+	while (ucnt < ccnt) {
+		lcnt = 0;
+		while ((lcnt + ucnt < ccnt) && (buf[lcnt + ucnt] != '\n')) {
+			lcnt++;
+		}
+		printk(KERN_INFO "%s %.*s\n", hdw->name, lcnt, buf + ucnt);
+		ucnt += lcnt + 1;
+	}
 }
 
 
-- 
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