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Commit 5937750e authored by Rama Krishna Phani A's avatar Rama Krishna Phani A
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rtc: qpnp-rtc: Add support for suspend to disk 



Add support to rtc driver for suspend to disk feature.
Free interrupts during hibernation and re-register them during
resume.

Change-Id: I1b6a454733a3f48674b031cda176e1a943e24c5a
Signed-off-by: default avatarRama Krishna Phani A <rphani@codeaurora.org>
parent 3610811d

drivers/rtc/qpnp-rtc.c

+49 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2012-2015, 2017-2018, The Linux Foundation. All rights reserved.

/* Copyright (c) 2012-2015, 2017-2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -689,6 +689,53 @@ static void qpnp_rtc_shutdown(struct platform_device *pdev) 
	}

}



static int qpnp_rtc_restore(struct device *dev)

{

	int rc = 0;

	struct qpnp_rtc *rtc_dd = dev_get_drvdata(dev);



	dev_dbg(dev, "%s\n", __func__);



	if (rtc_dd->rtc_alarm_irq > 0) {

		/* Enable abort enable feature */

		rtc_dd->alarm_ctrl_reg1 |= BIT_RTC_ABORT_ENABLE;

		rc = qpnp_write_wrapper(rtc_dd, &rtc_dd->alarm_ctrl_reg1,

				rtc_dd->alarm_base + REG_OFFSET_ALARM_CTRL1, 1);

		if (rc) {

			dev_err(dev, "SPMI write failed!\n");

			return rc;

		}



		/* Re-register for alarm Interrupt */

		rc = request_any_context_irq(rtc_dd->rtc_alarm_irq,

				 qpnp_alarm_trigger, IRQF_TRIGGER_RISING,

				 "qpnp_rtc_alarm", rtc_dd);

		if (rc)

			pr_err("Request IRQ failed (%d)\n", rc);

		else

			enable_irq_wake(rtc_dd->rtc_alarm_irq);

	}



	return rc;

}



static int qpnp_rtc_freeze(struct device *dev)

{

	struct qpnp_rtc *rtc_dd = dev_get_drvdata(dev);



	dev_dbg(dev, "%s\n", __func__);



	if (rtc_dd->rtc_alarm_irq > 0)

		free_irq(rtc_dd->rtc_alarm_irq, rtc_dd);



	return 0;

}



static const struct dev_pm_ops qpnp_rtc_pm_ops = {

	.freeze = qpnp_rtc_freeze,

	.restore = qpnp_rtc_restore,

};



static const struct of_device_id spmi_match_table[] = {

	{

		.compatible = "qcom,qpnp-rtc",
@@ -704,6 +751,7 @@ static struct platform_driver qpnp_rtc_driver = { 
		.name		= "qcom,qpnp-rtc",

		.owner		= THIS_MODULE,

		.of_match_table	= spmi_match_table,

		.pm		= &qpnp_rtc_pm_ops,

	},

};