Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755021AbaJ1Ugt (ORCPT ); Tue, 28 Oct 2014 16:36:49 -0400 Received: from mail-wi0-f180.google.com ([209.85.212.180]:51588 "EHLO mail-wi0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754927AbaJ1Ugo (ORCPT ); Tue, 28 Oct 2014 16:36:44 -0400 From: Pantelis Antoniou To: Grant Likely Cc: Rob Herring , Stephen Warren , Matt Porter , Koen Kooi , Greg Kroah-Hartman , Alison Chaiken , Dinh Nguyen , Jan Lubbe , Alexander Sverdlin , Michael Stickel , Guenter Roeck , Dirk Behme , Alan Tull , Sascha Hauer , Michael Bohan , Ionut Nicu , Michal Simek , Matt Ranostay , Joel Becker , devicetree@vger.kernel.org, Wolfram Sang , linux-i2c@vger.kernel.org, Mark Brown , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Pete Popov , Dan Malek , Georgi Vlaev , Pantelis Antoniou , Pantelis Antoniou Subject: [PATCH v8 6/8] OF: i2c: Add OF notifier handler Date: Tue, 28 Oct 2014 22:36:03 +0200 Message-Id: <1414528565-10907-7-git-send-email-pantelis.antoniou@konsulko.com> X-Mailer: git-send-email 1.7.12 In-Reply-To: <1414528565-10907-1-git-send-email-pantelis.antoniou@konsulko.com> References: <1414528565-10907-1-git-send-email-pantelis.antoniou@konsulko.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/