linux-kernel - [PATCH] tty: serial: 8250_dw: Implement suspend/resume

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Date:	Mon, 15 Oct 2012 10:25:58 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Alan Cox <alan@...ux.intel.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Axel Lin <axel.lin@...il.com>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	James Hogan <james.hogan@...tec.com>
Subject: [PATCH] tty: serial: 8250_dw: Implement suspend/resume

Implement suspend and resume callbacks for DesignWare 8250 driver.
They're simple wrappers around serial8250_{suspend,resume}_port.

Signed-off-by: James Hogan <james.hogan@...tec.com>
---
 drivers/tty/serial/8250/8250_dw.c |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index f574eef..53db7e8 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -161,6 +161,29 @@ static int __devexit dw8250_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int dw8250_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct dw8250_data *data = platform_get_drvdata(pdev);
+
+	serial8250_suspend_port(data->line);
+
+	return 0;
+}
+
+static int dw8250_resume(struct platform_device *pdev)
+{
+	struct dw8250_data *data = platform_get_drvdata(pdev);
+
+	serial8250_resume_port(data->line);
+
+	return 0;
+}
+#else
+#define dw8250_suspend NULL
+#define dw8250_resume NULL
+#endif /* CONFIG_PM */
+
 static const struct of_device_id dw8250_match[] = {
 	{ .compatible = "snps,dw-apb-uart" },
 	{ /* Sentinel */ }
@@ -175,6 +198,8 @@ static struct platform_driver dw8250_platform_driver = {
 	},
 	.probe			= dw8250_probe,
 	.remove			= __devexit_p(dw8250_remove),
+	.suspend		= dw8250_suspend,
+	.resume			= dw8250_resume,
 };
 
 module_platform_driver(dw8250_platform_driver);
-- 
1.7.7.6


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