From: Guenter Roeck <linux@roeck-us.net>
To: Peter Chen <hzpeterchen@gmail.com>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
Felipe Balbi <felipe.balbi@linux.intel.com>,
Oliver Neukum <oneukum@suse.com>,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
Roger Quadros <rogerq@ti.com>, Jun Li <jun.li@nxp.com>
Subject: Re: [PATCH v17 2/3] usb: USB Type-C connector class
Date: Thu, 2 Mar 2017 20:29:07 -0800 [thread overview]
Message-ID: <bbd1b0eb-7059-b72d-1fe4-27d9b5f84e0b@roeck-us.net> (raw)
In-Reply-To: <20170303033529.GA18650@b29397-desktop>
On 03/02/2017 07:35 PM, Peter Chen wrote:
> On Tue, Feb 21, 2017 at 05:24:04PM +0300, Heikki Krogerus wrote:
>> +/* --------------------------------------- */
>> +/* Driver callbacks to report role updates */
>> +
>> +/**
>> + * typec_set_data_role - Report data role change
>> + * @port: The USB Type-C Port where the role was changed
>> + * @role: The new data role
>> + *
>> + * This routine is used by the port drivers to report data role changes.
>> + */
>> +void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
>> +{
>> + if (port->data_role == role)
>> + return;
>> +
>> + port->data_role = role;
>> + sysfs_notify(&port->dev.kobj, NULL, "data_role");
>> + kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
>> +}
>> +EXPORT_SYMBOL_GPL(typec_set_data_role);
>> +
>
> Hi Keikki,
>
> Have you tested this interface with real dual-role controller/board?
If it helps, my primary test system is a HP Chromebook 13 G1.
> What interface you use when you receive this event to handle
> dual-role switch? I am wonder if a common dual-role class is
> needed, then we can have a common user utility.
I don't really understand "What interface you use when you receive
this event". Can you explain ?
>
> Eg, if "data_role" has changed, the udev can echo "data_role" to
> /sys/class/usb-dual-role/role
>
That sounds like a kernel event delivered to user space via udev or
sysfs notification and returned back into the kernel through a sysfs
attribute. Do I understand that correctly ?
Thanks,
Guenter
> Maybe we can enhance Roger's drd framework [1] to fulfill that.
>
> [1] https://lwn.net/Articles/682531/
>
next prev parent reply other threads:[~2017-03-03 6:03 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-21 14:24 [PATCH v17 0/3] USB Type-C Connector class Heikki Krogerus
2017-02-21 14:24 ` [PATCH v17 1/3] lib/string: add sysfs_match_string helper Heikki Krogerus
2017-02-21 14:24 ` [PATCH v17 2/3] usb: USB Type-C connector class Heikki Krogerus
2017-03-02 15:22 ` Mats Karrman
2017-03-03 3:13 ` Guenter Roeck
2017-03-03 7:29 ` Mats Karrman
2017-03-03 9:48 ` Enric Balletbo Serra
2017-03-03 12:59 ` Heikki Krogerus
2017-03-03 14:49 ` Guenter Roeck
2017-03-03 19:27 ` Mats Karrman
2017-03-06 9:37 ` Oliver Neukum
2017-03-06 13:14 ` Heikki Krogerus
2017-03-07 22:30 ` Mats Karrman
2017-03-08 1:38 ` Guenter Roeck
2017-04-08 23:09 ` USB Type-C Port Manager API concern Mats Karrman
2017-04-09 15:16 ` Guenter Roeck
2017-04-09 21:05 ` Mats Karrman
2017-04-14 2:57 ` Guenter Roeck
2017-04-14 8:30 ` Mats Karrman
2017-03-08 13:58 ` [PATCH v17 2/3] usb: USB Type-C connector class Heikki Krogerus
2017-03-10 22:22 ` Mats Karrman
2017-03-10 23:41 ` Guenter Roeck
2017-04-18 18:52 ` Badhri Jagan Sridharan
2017-04-19 11:23 ` Heikki Krogerus
2017-04-19 14:45 ` Badhri Jagan Sridharan
2017-04-19 15:14 ` Guenter Roeck
2017-04-19 17:22 ` Badhri Jagan Sridharan
2017-04-19 19:29 ` Guenter Roeck
2017-04-20 12:24 ` Heikki Krogerus
2017-04-20 19:46 ` Badhri Jagan Sridharan
2017-04-21 12:12 ` Heikki Krogerus
2017-04-21 13:14 ` Guenter Roeck
2017-04-21 14:27 ` Rajaram R
2017-04-21 16:43 ` Guenter Roeck
2017-04-22 9:23 ` Rajaram R
2017-04-24 17:50 ` Badhri Jagan Sridharan
2017-04-25 8:26 ` Rajaram R
2017-04-25 14:10 ` Guenter Roeck
2017-04-27 6:20 ` Rajaram R
2017-04-27 18:10 ` Guenter Roeck
2017-04-28 10:52 ` Heikki Krogerus
2017-04-20 11:55 ` Heikki Krogerus
2017-03-03 14:41 ` Guenter Roeck
2017-03-03 3:35 ` Peter Chen
2017-03-03 4:29 ` Guenter Roeck [this message]
2017-03-03 4:52 ` Peter Chen
2017-03-03 14:36 ` Guenter Roeck
2017-03-06 1:24 ` Peter Chen
2017-03-03 14:31 ` Heikki Krogerus
2017-03-06 1:15 ` Peter Chen
2017-03-06 13:16 ` Heikki Krogerus
2017-03-07 1:36 ` Peter Chen
2017-03-07 8:57 ` Heikki Krogerus
2017-03-08 1:53 ` Guenter Roeck
2017-03-08 6:50 ` Peter Chen
2017-03-08 14:44 ` Guenter Roeck
2017-03-09 2:00 ` Peter Chen
2017-02-21 14:24 ` [PATCH v17 3/3] usb: typec: add driver for Intel Whiskey Cove PMIC USB Type-C PHY Heikki Krogerus
2017-02-21 15:42 ` [PATCH v17 0/3] USB Type-C Connector class Felipe Balbi
2017-03-21 11:14 ` Heikki Krogerus
2017-03-21 10:23 ` Greg KH
2017-03-21 10:37 ` Heikki Krogerus
2017-03-22 21:15 ` Mats Karrman
2017-03-23 8:16 ` Heikki Krogerus
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