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authorMauro Carvalho Chehab <mchehab@redhat.com>2008-12-05 10:39:12 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2008-12-30 09:38:15 -0200
commiteb6c96345d07c7c3978e77d3ad0b5c5b9e5b2faa (patch)
tree0f79d5c5d8239c5dafe3c2d311c6611ff1e8a3d4
parent74a89b2ae352aca1d76789365e9f49964f2677e4 (diff)
V4L/DVB (9770): em28xx: turn off tuner when not used
em28xx devices generally get hot when xc3028 tuner is powered on. This patch solves this by turning power off when the device is not used, at the expense of having a higher load time, when calling a TV application. Since firmware load happens on 1 or 2 seconds on most devices, this is not a pain. Also, it helps to save the planet by saving some power :) Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/video/em28xx/em28xx-video.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 32b437fd793..6e558d2ca0f 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1695,6 +1695,9 @@ static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
return 0;
}
+ /* Save some power by putting tuner to sleep */
+ em28xx_i2c_call_clients(dev, TUNER_SET_STANDBY, NULL);
+
/* do this before setting alternate! */
em28xx_uninit_isoc(dev);
em28xx_set_mode(dev, EM28XX_SUSPEND);
@@ -2132,6 +2135,9 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
mutex_unlock(&em28xx_extension_devlist_lock);
mutex_unlock(&em28xx_devlist_mutex);
+ /* Save some power by putting tuner to sleep */
+ em28xx_i2c_call_clients(dev, TUNER_SET_STANDBY, NULL);
+
return 0;
fail_reg_devices: