linux-kernel - [PATCH v3 2/2] platform/chrome: cros_ec

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Message-Id: <20200629163851.2130450-2-pmalani@chromium.org>
Date:   Mon, 29 Jun 2020 09:38:52 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     heikki.krogerus@...ux.intel.com,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: [PATCH v3 2/2] platform/chrome: cros_ec_typec: Add PM support

Define basic suspend resume functions for cros-ec-typec. On suspend, we
simply ensure that any pending port update work is completed, and on
resume, we re-poll the port state to account for any
changes/disconnections that might have occurred during suspend.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---

Changes in v3:
- Remove superfluous DEV_PM_OPS #define.

Changes in v2:
- Remove #ifdef-ery, add __maybe_unused tag to functions.

 drivers/platform/chrome/cros_ec_typec.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 0beb62bf5adf..d5ac691de68b 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -722,11 +722,35 @@ static int cros_typec_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int __maybe_unused cros_typec_suspend(struct device *dev)
+{
+	struct cros_typec_data *typec = dev_get_drvdata(dev);
+
+	cancel_work_sync(&typec->port_work);
+
+	return 0;
+}
+
+static int __maybe_unused cros_typec_resume(struct device *dev)
+{
+	struct cros_typec_data *typec = dev_get_drvdata(dev);
+
+	/* Refresh port state. */
+	schedule_work(&typec->port_work);
+
+	return 0;
+}
+
+static const struct dev_pm_ops cros_typec_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(cros_typec_suspend, cros_typec_resume)
+};
+
 static struct platform_driver cros_typec_driver = {
 	.driver	= {
 		.name = DRV_NAME,
 		.acpi_match_table = ACPI_PTR(cros_typec_acpi_id),
 		.of_match_table = of_match_ptr(cros_typec_of_match),
+		.pm = &cros_typec_pm_ops,
 	},
 	.probe = cros_typec_probe,
 };
-- 
2.27.0.212.ge8ba1cc988-goog