From a932f507463d996b6ec1647ee7d4e2fa1e6aeda6 Mon Sep 17 00:00:00 2001 From: Mike Isely Date: Fri, 6 Mar 2009 23:47:10 -0300 Subject: [PATCH] V4L/DVB (11159): pvrusb2: Providing means to stop tracking an old i2c module This implements a temporary mechanism to "untrack" an i2c module from the old i2c layer. The v4l2-subdev related code in the driver will use this to remove a sub-device from the old i2c layer. In the end, once the old i2c layer is removed, this will also eventually go away. Signed-off-by: Mike Isely Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/pvrusb2/pvrusb2-hdw.c | 6 ++ .../media/video/pvrusb2/pvrusb2-i2c-track.c | 76 +++++++++++++------ .../media/video/pvrusb2/pvrusb2-i2c-track.h | 5 ++ 3 files changed, 64 insertions(+), 23 deletions(-) diff --git a/drivers/media/video/pvrusb2/pvrusb2-hdw.c b/drivers/media/video/pvrusb2/pvrusb2-hdw.c index faa94cef2c55..0e0d086bb278 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-hdw.c +++ b/drivers/media/video/pvrusb2/pvrusb2-hdw.c @@ -2020,6 +2020,12 @@ static void pvr2_hdw_load_subdev(struct pvr2_hdw *hdw, i2caddr); } + /* If we have both old and new i2c layers enabled, make sure that + old layer isn't also tracking this module. This is a debugging + aid, in normal situations there's no reason for both mechanisms + to be enabled. */ + pvr2_i2c_untrack_subdev(hdw, sd); + // ????? /* Based on module ID, we should remember subdev pointers so that we can send certain custom commands where diff --git a/drivers/media/video/pvrusb2/pvrusb2-i2c-track.c b/drivers/media/video/pvrusb2/pvrusb2-i2c-track.c index 4bb6f9453e0d..3387897ed897 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-i2c-track.c +++ b/drivers/media/video/pvrusb2/pvrusb2-i2c-track.c @@ -421,41 +421,71 @@ void pvr2_i2c_track_attach_inform(struct i2c_client *client) if (fl) queue_work(hdw->workqueue,&hdw->worki2csync); } +static void pvr2_i2c_client_disconnect(struct pvr2_i2c_client *cp) +{ + if (cp->handler && cp->handler->func_table->detach) { + cp->handler->func_table->detach(cp->handler->func_data); + } + list_del(&cp->list); + kfree(cp); +} + void pvr2_i2c_track_detach_inform(struct i2c_client *client) { struct pvr2_hdw *hdw = (struct pvr2_hdw *)(client->adapter->algo_data); struct pvr2_i2c_client *cp, *ncp; unsigned long amask = 0; int foundfl = 0; - mutex_lock(&hdw->i2c_list_lock); do { - hdw->cropcap_stale = !0; - list_for_each_entry_safe(cp, ncp, &hdw->i2c_clients, list) { - if (cp->client == client) { - trace_i2c("pvr2_i2c_detach" - " [client=%s @ 0x%x ctxt=%p]", - client->name, - client->addr,cp); - if (cp->handler && - cp->handler->func_table->detach) { - cp->handler->func_table->detach( - cp->handler->func_data); - } - list_del(&cp->list); - kfree(cp); - foundfl = !0; - continue; - } - amask |= cp->ctl_mask; + mutex_lock(&hdw->i2c_list_lock); + hdw->cropcap_stale = !0; + list_for_each_entry_safe(cp, ncp, &hdw->i2c_clients, list) { + if (cp->client == client) { + trace_i2c("pvr2_i2c_detach" + " [client=%s @ 0x%x ctxt=%p]", + client->name, + client->addr, cp); + pvr2_i2c_client_disconnect(cp); + foundfl = !0; + continue; } - hdw->i2c_active_mask = amask; - } while (0); mutex_unlock(&hdw->i2c_list_lock); + amask |= cp->ctl_mask; + } + hdw->i2c_active_mask = amask; + mutex_unlock(&hdw->i2c_list_lock); if (!foundfl) { trace_i2c("pvr2_i2c_detach [client=%s @ 0x%x ctxt=]", - client->name, - client->addr); + client->name, client->addr); } } +/* This function is used to remove an i2c client from our tracking + structure if the client happens to be the specified v4l2 sub-device. + The idea here is to ensure that sub-devices are not also tracked with + the old tracking mechanism - it's one or the other not both. This is + only for debugging. In a "real" environment, only one of these two + mechanisms should even be compiled in. But by enabling both we can + incrementally test control of each sub-device. */ +void pvr2_i2c_untrack_subdev(struct pvr2_hdw *hdw, struct v4l2_subdev *sd) +{ + struct i2c_client *client; + struct pvr2_i2c_client *cp, *ncp; + unsigned long amask = 0; + mutex_lock(&hdw->i2c_list_lock); + list_for_each_entry_safe(cp, ncp, &hdw->i2c_clients, list) { + client = cp->client; + if (i2c_get_clientdata(client) == sd) { + trace_i2c("pvr2_i2c_detach (subdev active)" + " [client=%s @ 0x%x ctxt=%p]", + client->name, client->addr, cp); + pvr2_i2c_client_disconnect(cp); + continue; + } + amask |= cp->ctl_mask; + } + hdw->i2c_active_mask = amask; + mutex_unlock(&hdw->i2c_list_lock); +} + void pvr2_i2c_track_init(struct pvr2_hdw *hdw) { hdw->i2c_pend_mask = 0; diff --git a/drivers/media/video/pvrusb2/pvrusb2-i2c-track.h b/drivers/media/video/pvrusb2/pvrusb2-i2c-track.h index 7d0e4fb63785..eba48e4c9585 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-i2c-track.h +++ b/drivers/media/video/pvrusb2/pvrusb2-i2c-track.h @@ -22,6 +22,8 @@ #include #include +#include + struct pvr2_hdw; struct pvr2_i2c_client; @@ -83,6 +85,9 @@ unsigned int pvr2_i2c_report(struct pvr2_hdw *,char *buf,unsigned int maxlen); void pvr2_i2c_probe(struct pvr2_hdw *,struct pvr2_i2c_client *); const struct pvr2_i2c_op *pvr2_i2c_get_op(unsigned int idx); +void pvr2_i2c_untrack_subdev(struct pvr2_hdw *, struct v4l2_subdev *sd); + + #endif /* __PVRUSB2_I2C_CORE_H */ -- 2.20.1