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V4L/DVB (9770): em28xx: turn off tuner when not used

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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>
This commit is contained in:
Mauro Carvalho Chehab 2008-12-05 10:39:12 -03:00
parent 74a89b2ae3
commit eb6c96345d
1 changed files with 6 additions and 0 deletions
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6
drivers/media/video/em28xx/em28xx-video.c
View file

@ -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: