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Tue, 23 Aug 2022 11:53:22 +0000 From: Xu Yang To: heikki.krogerus@linux.intel.com, robh+dt@kernel.org, peda@axentia.se, shawnguo@kernel.org Cc: gregkh@linuxfoundation.org, linux@roeck-us.net, jun.li@nxp.com, xu.yang_2@nxp.com, linux-usb@vger.kernel.org, linux-imx@nxp.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 3/4] usb: typec: mux: add typec orientation switch support via mux controller Date: Wed, 24 Aug 2022 03:54:28 +0800 Message-Id: <20220823195429.1243516-4-xu.yang_2@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220823195429.1243516-1-xu.yang_2@nxp.com> References: <20220823195429.1243516-1-xu.yang_2@nxp.com> X-ClientProxiedBy: SG2PR04CA0155.apcprd04.prod.outlook.com (2603:1096:4::17) To PAXPR04MB8784.eurprd04.prod.outlook.com (2603:10a6:102:20f::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8bb2dce8-bd40-4001-5767-08da84fe145f X-MS-TrafficTypeDiagnostic: DB8PR04MB6668:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Also, one mux controller could cover highspeed, superspeed and sideband use case one time in this implementation. Reported-by: kernel test robot Signed-off-by: Xu Yang --- Changes since v1: - add build dependence (select MULTIPLEXER) - improve Multiplexer control logic drivers/usb/typec/Kconfig | 1 + drivers/usb/typec/mux.c | 76 ++++++++++++++++++++++++++++++++++- include/linux/usb/typec_mux.h | 7 +--- 3 files changed, 78 insertions(+), 6 deletions(-) diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig index 5defdfead653..73d4976d8148 100644 --- a/drivers/usb/typec/Kconfig +++ b/drivers/usb/typec/Kconfig @@ -2,6 +2,7 @@ menuconfig TYPEC tristate "USB Type-C Support" + select MULTIPLEXER help USB Type-C Specification defines a cable and connector for USB where only one type of plug is supported on both ends, i.e. there will not diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c index 464330776cd6..05e6ed217620 100644 --- a/drivers/usb/typec/mux.c +++ b/drivers/usb/typec/mux.c @@ -13,6 +13,7 @@ #include #include #include +#include #include "class.h" #include "mux.h" @@ -22,6 +23,11 @@ struct typec_switch { struct typec_switch_dev *sw_devs[TYPEC_MUX_MAX_DEVS]; unsigned int num_sw_devs; + + /* Could handle HighSpeed, SuperSpeed, Sideband switch one time */ + struct mux_control *mux_switch; + /* 3 state correspond to NONE, NORMAL, REVERSE for all switches */ + int mux_states[3]; }; static int switch_fwnode_match(struct device *dev, const void *fwnode) @@ -117,6 +123,58 @@ struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode) } EXPORT_SYMBOL_GPL(fwnode_typec_switch_get); +static struct typec_switch *mux_control_typec_switch_get(struct device *dev) +{ + struct typec_switch *sw; + struct mux_control *mux; + int ret; + + if (!device_property_present(dev, "mux-controls")) + return NULL; + + sw = kzalloc(sizeof(*sw), GFP_KERNEL); + if (!sw) + return ERR_PTR(-ENOMEM); + + mux = mux_control_get(dev, NULL); + if (!IS_ERR(mux)) { + sw->mux_switch = mux; + ret = device_property_read_u32_array(dev, + "typec-switch-states", sw->mux_states, 3); + if (ret) { + kfree(sw); + return ERR_PTR(ret); + } + } else { + kfree(sw); + return ERR_CAST(mux); + } + + return sw; +} + +/** + * typec_switch_get - Find USB Type-C orientation switch + * @dev: The device using switch + * + * Finds a switch used by @dev. Returns a reference to the switch on + * success, NULL if no matching connection was found, or + * ERR_PTR(-EPROBE_DEFER) when a connection was found but the switch + * has not been enumerated yet, or ERR_PTR with a negative errno. + */ +struct typec_switch *typec_switch_get(struct device *dev) +{ + struct typec_switch *sw; + + sw = fwnode_typec_switch_get(dev_fwnode(dev)); + if (!sw) + /* Try get switch based on mux control */ + sw = mux_control_typec_switch_get(dev); + + return sw; +} +EXPORT_SYMBOL_GPL(typec_switch_get); + /** * typec_switch_put - Release USB Type-C orientation switch * @sw: USB Type-C orientation switch @@ -137,6 +195,10 @@ void typec_switch_put(struct typec_switch *sw) module_put(sw_dev->dev.parent->driver->owner); put_device(&sw_dev->dev); } + + if (sw->mux_switch) + mux_control_put(sw->mux_switch); + kfree(sw); } EXPORT_SYMBOL_GPL(typec_switch_put); @@ -204,6 +266,7 @@ int typec_switch_set(struct typec_switch *sw, enum typec_orientation orientation) { struct typec_switch_dev *sw_dev; + struct mux_control *mux; unsigned int i; int ret; @@ -218,7 +281,18 @@ int typec_switch_set(struct typec_switch *sw, return ret; } - return 0; + mux = sw->mux_switch; + if (!mux) + return 0; + + ret = mux_control_select(mux, sw->mux_states[orientation]); + if (ret) + return ret; + + /* Keep it as it is since idle_state is MUX_IDLE_AS_IS */ + ret = mux_control_deselect(mux); + + return ret; } EXPORT_SYMBOL_GPL(typec_switch_set); diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h index 9292f0e07846..2287e5a5f591 100644 --- a/include/linux/usb/typec_mux.h +++ b/include/linux/usb/typec_mux.h @@ -24,16 +24,13 @@ struct typec_switch_desc { void *drvdata; }; + +struct typec_switch *typec_switch_get(struct device *dev); struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode); void typec_switch_put(struct typec_switch *sw); int typec_switch_set(struct typec_switch *sw, enum typec_orientation orientation); -static inline struct typec_switch *typec_switch_get(struct device *dev) -{ - return fwnode_typec_switch_get(dev_fwnode(dev)); -} - struct typec_switch_dev * typec_switch_register(struct device *parent, const struct typec_switch_desc *desc);