V4L/DVB (4665): Add frontend structure callback for bus acquisition.

This patch enables generic bus arbitration callbacks enabling
dvbcore frontend_open and frontend_release to pass 'acquire'
and 'release' hardware messages back into the DVB bridge frameworks.
Frameworks like cx88 can then implement single bus multiple demod
card sharing features, which would prohibit two frontends from attempting
to use a single transport bus at the same time.

Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 3dd5dbafb330634c400e57d58b198eb21ef5c9a0..53304e6991ac61326fbec9001d362530f62bd8d9 100644 (file)
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -1014,6 +1014,13 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
        if ((ret = dvb_generic_open (inode, file)) < 0)
                return ret;
 
+       if (fe->ops.ts_bus_ctrl) {
+               if ((ret = fe->ops.ts_bus_ctrl (fe, 1)) < 0) {
+                       dvb_generic_release (inode, file);
+                       return ret;
+               }
+       }
+
        if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
 
                /* normal tune mode when opened R/W */
@@ -1043,6 +1050,9 @@ static int dvb_frontend_release(struct inode *inode, struct file *file)
        if ((file->f_flags & O_ACCMODE) != O_RDONLY)
                fepriv->release_jiffies = jiffies;
 
+       if (fe->ops.ts_bus_ctrl)
+               fe->ops.ts_bus_ctrl (fe, 0);
+
        return dvb_generic_release (inode, file);
 }
 

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.h b/drivers/media/dvb/dvb-core/dvb_frontend.h
index e5d5028b3694fc68663da122664e6172095c596f..f233d78bc3644bfdd93670ac7447bb280e852e94 100644 (file)
--- a/drivers/media/dvb/dvb-core/dvb_frontend.h
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.h
@@ -129,6 +129,7 @@ struct dvb_frontend_ops {
        int (*enable_high_lnb_voltage)(struct dvb_frontend* fe, long arg);
        int (*dishnetwork_send_legacy_command)(struct dvb_frontend* fe, unsigned long cmd);
        int (*i2c_gate_ctrl)(struct dvb_frontend* fe, int enable);
+       int (*ts_bus_ctrl)(struct dvb_frontend* fe, int acquire);
 
        struct dvb_tuner_ops tuner_ops;
 };