From: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <robherring2@gmail.com>,
Stephen Warren <swarren@wwwdotorg.org>,
Matt Porter <matt.porter@linaro.org>,
Koen Kooi <koen@dominion.thruhere.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alison Chaiken <Alison_Chaiken@mentor.com>,
Dinh Nguyen <dinh.linux@gmail.com>, Jan Lubbe <jluebbe@lasnet.de>,
Alexander Sverdlin <alexander.sverdlin@nsn.com>,
Michael Stickel <ms@mycable.de>,
Guenter Roeck <linux@roeck-us.net>,
Dirk Behme <dirk.behme@gmail.com>,
Alan Tull <delicious.quinoa@gmail.com>,
Sascha Hauer <s.hauer@pengutronix.de>,
Michael Bohan <mbohan@codeaurora.org>,
Ionut Nicu <ioan.nicu.ext@nsn.com>,
Michal Simek <monstr@monstr.eu>,
Matt Ranostay <mranostay@gmail.com>,
Joel Becker <jlbec@evilplan.org>,
devicetree@vger.kernel.org, Wolfram Sang <wsa@the-dreams.de>,
linux-i2c@vger.kernel.org, Mark Brown <broonie@kernel.org>,
linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org,
Pete Popov <pete.popov@konsulko.com>,
Dan Malek <dan.malek@konsulko.com>,
Georgi Vlaev <georgi.vlaev@konsulko.com>,
Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
Pantelis Antoniou <panto@antoniou-consulting.com>
Subject: [PATCH v8 6/8] OF: i2c: Add OF notifier handler
Date: Tue, 28 Oct 2014 22:36:03 +0200 [thread overview]
Message-ID: <1414528565-10907-7-git-send-email-pantelis.antoniou@konsulko.com> (raw)
In-Reply-To: <1414528565-10907-1-git-send-email-pantelis.antoniou@konsulko.com>
Add OF notifier handler needed for creating/destroying i2c devices
according to dynamic runtime changes in the DT live tree.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
---
drivers/i2c/i2c-core.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 78 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e6da9d3..e751b78 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1470,6 +1470,7 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
return i2c_verify_adapter(dev);
}
EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
+
#else
static void of_i2c_register_devices(struct i2c_adapter *adap) { }
#endif /* CONFIG_OF */
@@ -1955,6 +1956,71 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
}
EXPORT_SYMBOL(i2c_clients_command);
+#if IS_ENABLED(CONFIG_OF)
+
+static int of_i2c_notify(struct notifier_block *nb,
+ unsigned long action, void *arg)
+{
+ struct device_node *dn;
+ struct i2c_adapter *adap;
+ struct i2c_client *client;
+ int state;
+
+ state = of_reconfig_get_state_change(action, arg);
+ if (state == -1)
+ return NOTIFY_OK;
+
+ switch (action) {
+ case OF_RECONFIG_ATTACH_NODE:
+ case OF_RECONFIG_DETACH_NODE:
+ dn = arg;
+ break;
+ case OF_RECONFIG_ADD_PROPERTY:
+ case OF_RECONFIG_REMOVE_PROPERTY:
+ case OF_RECONFIG_UPDATE_PROPERTY:
+ dn = ((struct of_prop_reconfig *)arg)->dn;
+ break;
+ default:
+ return NOTIFY_OK;
+ }
+
+ if (state) {
+
+ adap = of_find_i2c_adapter_by_node(dn->parent);
+ if (adap == NULL)
+ return NOTIFY_OK; /* not for us */
+
+ client = of_i2c_register_device(adap, dn);
+ put_device(&adap->dev);
+
+ if (IS_ERR(client)) {
+ pr_err("%s: failed to create for '%s'\n",
+ __func__, dn->full_name);
+ return notifier_from_errno(PTR_ERR(client));
+ }
+
+ } else {
+
+ /* find our device by node */
+ client = of_find_i2c_device_by_node(dn);
+ if (client == NULL)
+ return NOTIFY_OK; /* no? not meant for us */
+
+ /* unregister takes one ref away */
+ i2c_unregister_device(client);
+
+ /* and put the reference of the find */
+ put_device(&client->dev);
+
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block i2c_of_notifier;
+
+#endif
+
static int __init i2c_init(void)
{
int retval;
@@ -1972,8 +2038,19 @@ static int __init i2c_init(void)
retval = i2c_add_driver(&dummy_driver);
if (retval)
goto class_err;
- return 0;
+#if IS_ENABLED(CONFIG_OF)
+ i2c_of_notifier.notifier_call = of_i2c_notify;
+ retval = of_reconfig_notifier_register(&i2c_of_notifier);
+ if (retval)
+ goto notifier_err;
+#endif
+
+ return 0;
+#if IS_ENABLED(CONFIG_OF)
+notifier_err:
+ i2c_del_driver(&dummy_driver);
+#endif
class_err:
#ifdef CONFIG_I2C_COMPAT
class_compat_unregister(i2c_adapter_compat_class);
--
1.7.12
next prev parent reply other threads:[~2014-10-28 20:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-28 20:35 [PATCH v8 0/8] Device Tree Overlays - 8th time's the charm Pantelis Antoniou
2014-10-28 20:35 ` [PATCH v8 1/8] OF: Introduce DT overlay support. (v2) Pantelis Antoniou
2014-11-13 23:36 ` Grant Likely
2014-11-17 14:35 ` Pantelis Antoniou
2014-11-17 22:54 ` Grant Likely
2014-10-28 20:35 ` [PATCH v8 2/8] OF: selftest: Add overlay self-test " Pantelis Antoniou
2014-10-28 20:36 ` [PATCH v8 3/8] OF: DT-Overlay configfs interface (v2) Pantelis Antoniou
2014-11-25 10:28 ` Grant Likely
2014-11-25 14:50 ` Pantelis Antoniou
2014-11-26 12:49 ` Grant Likely
2014-10-28 20:36 ` [PATCH v8 4/8] OF: platform: Add OF notifier handler Pantelis Antoniou
2014-11-13 23:29 ` Grant Likely
2014-11-14 15:13 ` Pantelis Antoniou
2014-10-28 20:36 ` [PATCH v8 5/8] of: i2c: Export single device registration method Pantelis Antoniou
2014-11-21 1:46 ` Grant Likely
2014-11-23 16:22 ` Wolfram Sang
2014-10-28 20:36 ` Pantelis Antoniou [this message]
2014-11-21 1:53 ` [PATCH v8 6/8] OF: i2c: Add OF notifier handler Grant Likely
2014-11-21 2:03 ` Guenter Roeck
2014-11-21 15:08 ` Grant Likely
2014-11-21 15:11 ` Pantelis Antoniou
2014-11-23 16:23 ` Wolfram Sang
2014-10-28 20:36 ` [PATCH v8 7/8] of: spi: Export single device registration method and accessors Pantelis Antoniou
2014-10-29 7:44 ` Alexander Sverdlin
2014-10-29 8:19 ` Pantelis Antoniou
2014-10-28 20:36 ` [PATCH v8 8/8] OF: spi: Add OF notifier handler Pantelis Antoniou
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