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NFC: trf7970a: Add System Suspend/Resume support

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Add system suspend/resume support by gracefully
shutting things down when suspending and bringing
the device back to full power when resuming.

Signed-off-by: Mark A. Greer <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
This commit is contained in:
Mark A. Greer 2014-09-02 15:12:37 -07:00 • committed by Samuel Ortiz
commit 77c9539dc1
1 changed files with 37 additions and 0 deletions
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37
drivers/nfc/trf7970a.c
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@ -1594,6 +1594,42 @@ static int trf7970a_remove(struct spi_device *spi)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int trf7970a_suspend(struct device *dev)
{
struct spi_device *spi = container_of(dev, struct spi_device, dev);
struct trf7970a *trf = spi_get_drvdata(spi);
int ret = 0;
dev_dbg(dev, "Suspend\n");
mutex_lock(&trf->lock);
trf7970a_shutdown(trf);
mutex_unlock(&trf->lock);
return ret;
}
static int trf7970a_resume(struct device *dev)
{
struct spi_device *spi = container_of(dev, struct spi_device, dev);
struct trf7970a *trf = spi_get_drvdata(spi);
int ret = 0;
dev_dbg(dev, "Resume\n");
mutex_lock(&trf->lock);
ret = trf7970a_startup(trf);
mutex_unlock(&trf->lock);
return ret;
}
#endif
#ifdef CONFIG_PM_RUNTIME
static int trf7970a_pm_runtime_suspend(struct device *dev)
{
@ -1629,6 +1665,7 @@ static int trf7970a_pm_runtime_resume(struct device *dev)
#endif
static const struct dev_pm_ops trf7970a_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
trf7970a_pm_runtime_resume, NULL)
};