V4L/DVB (9769): tuner-xc2028: powers device of when not used
Since the firmware load is now fast on most boards, better to keep the tuner
off by default. A modprobe parameter were added to keep the old behavior,
to be used by old devices.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/common/tuners/tuner-xc2028.c b/drivers/media/common/tuners/tuner-xc2028.c
index b65e680..8a964b4 100644
--- a/drivers/media/common/tuners/tuner-xc2028.c
+++ b/drivers/media/common/tuners/tuner-xc2028.c
@@ -28,6 +28,12 @@
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages");
+static int no_poweroff;
+module_param(no_poweroff, int, 0644);
+MODULE_PARM_DESC(debug, "0 (default) powers device off when not used.\n"
+ "1 keep device energized and with tuner ready all the times.\n"
+ " Faster, but consumes more power and keeps the device hotter\n");
+
static char audio_std[8];
module_param_string(audio_std, audio_std, sizeof(audio_std), 0);
MODULE_PARM_DESC(audio_std,
@@ -1091,6 +1097,30 @@
T_DIGITAL_TV, type, 0, demod);
}
+static int xc2028_sleep(struct dvb_frontend *fe)
+{
+ struct xc2028_data *priv = fe->tuner_priv;
+ int rc = 0;
+
+ /* Avoid firmware reload on slow devices */
+ if (no_poweroff)
+ return;
+
+ tuner_dbg("Putting xc2028/3028 into poweroff mode.\n");
+
+ mutex_lock(&priv->lock);
+
+ if (priv->firm_version < 0x0202)
+ rc = send_seq(priv, {0x00, 0x08, 0x00, 0x00});
+ else
+ rc = send_seq(priv, {0x80, 0x08, 0x00, 0x00});
+
+ priv->cur_fw.type = 0; /* need firmware reload */
+
+ mutex_unlock(&priv->lock);
+
+ return rc;
+}
static int xc2028_dvb_release(struct dvb_frontend *fe)
{
@@ -1171,6 +1201,7 @@
.get_frequency = xc2028_get_frequency,
.get_rf_strength = xc2028_signal,
.set_params = xc2028_set_params,
+ .sleep = xc2028_sleep,
};
struct dvb_frontend *xc2028_attach(struct dvb_frontend *fe,