From: Gerd Knorr <kraxel@bytesex.org>
To: Andrew Morton <akpm@osdl.org>, Greg KH <greg@kroah.com>,
Kernel List <linux-kernel@vger.kernel.org>
Subject: [patch] i2c bus power management support
Date: Fri, 8 Oct 2004 12:44:04 +0200 [thread overview]
Message-ID: <20041008104404.GA24760@bytesex> (raw)
Hi,
The patch below adds power management support to the i2c bus.
It adds just two small functions which call down to the devices
power management functions if they are present, so the i2c device
drivers will receive the suspend and resume events.
Gerd
Index: linux-2.6.8/drivers/i2c/i2c-core.c
===================================================================
--- linux-2.6.8.orig/drivers/i2c/i2c-core.c 2004-08-18 12:11:55.000000000 +0200
+++ linux-2.6.8/drivers/i2c/i2c-core.c 2004-10-08 12:38:55.075642304 +0200
@@ -517,9 +517,29 @@ static int i2c_device_match(struct devic
return 1;
}
+static int i2c_bus_suspend(struct device * dev, u32 state)
+{
+ int rc = 0;
+
+ if (dev->driver && dev->driver->suspend)
+ rc = dev->driver->suspend(dev,state,0);
+ return rc;
+}
+
+static int i2c_bus_resume(struct device * dev)
+{
+ int rc = 0;
+
+ if (dev->driver && dev->driver->resume)
+ rc = dev->driver->resume(dev,0);
+ return rc;
+}
+
struct bus_type i2c_bus_type = {
.name = "i2c",
.match = i2c_device_match,
+ .suspend = i2c_bus_suspend,
+ .resume = i2c_bus_resume,
};
static int __init i2c_init(void)
reply other threads:[~2004-10-08 11:00 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20041008104404.GA24760@bytesex \
--to=kraxel@bytesex.org \
--cc=akpm@osdl.org \
--cc=greg@kroah.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox