From 53f02dd170952065cf1c6c18fefa194bd403c4ee Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Fri, 5 Dec 2008 11:39:12 -0200 Subject: em28xx: turn off tuner when not used From: Mauro Carvalho Chehab 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 :) Priority: normal Signed-off-by: Mauro Carvalho Chehab --- linux/drivers/media/video/em28xx/em28xx-video.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'linux/drivers/media/video/em28xx') diff --git a/linux/drivers/media/video/em28xx/em28xx-video.c b/linux/drivers/media/video/em28xx/em28xx-video.c index 00d49c45f..ff960f90c 100644 --- a/linux/drivers/media/video/em28xx/em28xx-video.c +++ b/linux/drivers/media/video/em28xx/em28xx-video.c @@ -1758,6 +1758,9 @@ 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); @@ -2203,6 +2206,9 @@ 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: -- cgit v1.2.3