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viafb: suspend/resume for GPIOs

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Be sure to re-enable GPIO lines on resume.  Users still have to
be sure to set them properly.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Jonathan Corbet 2010-10-28 18:23:21 +01:00 committed by Florian Tobias Schandinat
parent 751305d9b2
commit 67eb6f9617
1 changed files with 29 additions and 0 deletions
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29
drivers/video/via/via-gpio.c
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@ -172,6 +172,28 @@ static void viafb_gpio_disable(struct viafb_gpio *gpio)
via_write_reg_mask(VIASR, gpio->vg_port_index, 0, 0x02);
}
#ifdef CONFIG_PM
static int viafb_gpio_suspend(void *private)
{
return 0;
}
static int viafb_gpio_resume(void *private)
{
int i;
for (i = 0; i < gpio_config.gpio_chip.ngpio; i += 2)
viafb_gpio_enable(gpio_config.active_gpios[i]);
return 0;
}
static struct viafb_pm_hooks viafb_gpio_pm_hooks = {
.suspend = viafb_gpio_suspend,
.resume = viafb_gpio_resume
};
#endif /* CONFIG_PM */
/*
* Look up a specific gpio and return the number it was assigned.
*/
@ -236,6 +258,9 @@ static __devinit int viafb_gpio_probe(struct platform_device *platdev)
printk(KERN_ERR "viafb: failed to add gpios (%d)\n", ret);
gpio_config.gpio_chip.ngpio = 0;
}
#ifdef CONFIG_PM
viafb_pm_register(&viafb_gpio_pm_hooks);
#endif
return ret;
}
@ -245,6 +270,10 @@ static int viafb_gpio_remove(struct platform_device *platdev)
unsigned long flags;
int ret = 0, i;
#ifdef CONFIG_PM
viafb_pm_unregister(&viafb_gpio_pm_hooks);
#endif
/*
* Get unregistered.
*/