diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-typec | 8 | ||||
| -rw-r--r-- | drivers/usb/typec/class.c | 66 | ||||
| -rw-r--r-- | include/linux/usb/typec.h | 1 |
3 files changed, 74 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec index b7794e02ad20..a195247d83ee 100644 --- a/Documentation/ABI/testing/sysfs-class-typec +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -139,6 +139,14 @@ Description: Shows if the partner supports USB Power Delivery communication: Valid values: yes, no +What: /sys/class/typec/<port>-partner/number_of_alternate_modes +Date: November 2020 +Contact: Prashant Malani <pmalani@chromium.org> +Description: + Shows the number of alternate modes which are advertised by the partner + during Power Delivery discovery. This file remains hidden until a value + greater than or equal to 0 is set by Type C port driver. + What: /sys/class/typec/<port>-partner>/identity/ Date: April 2017 Contact: Heikki Krogerus <heikki.krogerus@linux.intel.com> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c index 35eec707cb51..c7412ddbd311 100644 --- a/drivers/usb/typec/class.c +++ b/drivers/usb/typec/class.c @@ -33,6 +33,7 @@ struct typec_partner { struct usb_pd_identity *identity; enum typec_accessory accessory; struct ida mode_ids; + int num_altmodes; }; struct typec_port { @@ -532,12 +533,43 @@ static ssize_t supports_usb_power_delivery_show(struct device *dev, } static DEVICE_ATTR_RO(supports_usb_power_delivery); +static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct typec_partner *p = to_typec_partner(dev); + + return sysfs_emit(buf, "%d\n", p->num_altmodes); +} +static DEVICE_ATTR_RO(number_of_alternate_modes); + static struct attribute *typec_partner_attrs[] = { &dev_attr_accessory_mode.attr, &dev_attr_supports_usb_power_delivery.attr, + &dev_attr_number_of_alternate_modes.attr, + NULL +}; + +static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) +{ + struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj)); + + if (attr == &dev_attr_number_of_alternate_modes.attr) { + if (partner->num_altmodes < 0) + return 0; + } + + return attr->mode; +} + +static struct attribute_group typec_partner_group = { + .is_visible = typec_partner_attr_is_visible, + .attrs = typec_partner_attrs +}; + +static const struct attribute_group *typec_partner_groups[] = { + &typec_partner_group, NULL }; -ATTRIBUTE_GROUPS(typec_partner); static void typec_partner_release(struct device *dev) { @@ -571,6 +603,37 @@ int typec_partner_set_identity(struct typec_partner *partner) EXPORT_SYMBOL_GPL(typec_partner_set_identity); /** + * typec_partner_set_num_altmodes - Set the number of available partner altmodes + * @partner: The partner to be updated. + * @num_alt_modes: The number of altmodes we want to specify as available. + * + * This routine is used to report the number of alternate modes supported by the + * partner. This value is *not* enforced in alternate mode registration routines. + * + * @partner.num_altmodes is set to -1 on partner registration, denoting that + * a valid value has not been set for it yet. + * + * Returns 0 on success or negative error number on failure. + */ +int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes) +{ + int ret; + + if (num_altmodes < 0) + return -EINVAL; + + partner->num_altmodes = num_altmodes; + ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group); + if (ret < 0) + return ret; + + sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes"); + + return 0; +} +EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes); + +/** * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode * @partner: USB Type-C Partner that supports the alternate mode * @desc: Description of the alternate mode @@ -612,6 +675,7 @@ struct typec_partner *typec_register_partner(struct typec_port *port, ida_init(&partner->mode_ids); partner->usb_pd = desc->usb_pd; partner->accessory = desc->accessory; + partner->num_altmodes = -1; if (desc->identity) { /* diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h index 6be558045942..bc6b1a71cb8a 100644 --- a/include/linux/usb/typec.h +++ b/include/linux/usb/typec.h @@ -126,6 +126,7 @@ struct typec_altmode_desc { enum typec_port_data roles; }; +int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes); struct typec_altmode *typec_partner_register_altmode(struct typec_partner *partner, const struct typec_altmode_desc *desc); |