linux-kernel - [RFC,PATCH v2] rtc: DS1374 wakeup support

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Date:	Wed, 30 Jul 2008 10:27:52 +0200
From:	Marc Pignat <marc.pignat@...s.ch>
To:	a.zummo@...ertech.it
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	David Brownell <david-b@...bell.net>
Subject: [RFC,PATCH v2] rtc: DS1374 wakeup support

Wakeup support implementation.

Signed-off-by: Marc Pignat <marc.pignat@...s.ch>
---

Hi all!

If your system can wakup using this device, add the I2C_CLIENT_WAKE in your i2c
board info flags, and that's it.

This patch depends on the I2C_CLIENT_WAKE functionnality which is fixed in the
patch '[RFC,PATCH] i2c: fix device_init_wakeup place' (http://lkml.org/lkml/2008/7/29/194).

Changes since v1:
 * patch against 2.6.27-rc1
 * removed device_init_wakeup(...) calls, they should be handled in i2c-core.c

Best regards

Marc



diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 640acd2..b6219c6 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -429,12 +429,33 @@ static int __devexit ds1374_remove(struct i2c_client *client)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int ds1374_suspend(struct i2c_client *client, pm_message_t state)
+{
+	if (client->irq >= 0 && device_may_wakeup(&client->dev))
+		enable_irq_wake(client->irq);
+	return 0;
+}
+
+static int ds1374_resume(struct i2c_client *client)
+{
+	if (client->irq >= 0 && device_may_wakeup(&client->dev))
+		disable_irq_wake(client->irq);
+	return 0;
+}
+#else
+#define ds1374_suspend	NULL
+#define ds1374_resume	NULL
+#endif
+
 static struct i2c_driver ds1374_driver = {
 	.driver = {
 		.name = "rtc-ds1374",
 		.owner = THIS_MODULE,
 	},
 	.probe = ds1374_probe,
+	.suspend = ds1374_suspend,
+	.resume = ds1374_resume,
 	.remove = __devexit_p(ds1374_remove),
 	.id_table = ds1374_id,
 };
--
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