1 files changed, 707 insertions, 0 deletions
diff --git a/drivers/usb/typec/pd.c b/drivers/usb/typec/pd.c
new file mode 100644
index 000000000..fd2477161
--- /dev/null
+++ b/drivers/usb/typec/pd.c
@@ -0,0 +1,707 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USB Power Delivery sysfs entries
+ *
+ * Copyright (C) 2022, Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/usb/pd.h>
+
+#include "pd.h"
+
+static DEFINE_IDA(pd_ida);
+
+static struct class pd_class = {
+	.name = "usb_power_delivery",
+	.owner = THIS_MODULE,
+};
+
+#define to_pdo(o) container_of(o, struct pdo, dev)
+
+struct pdo {
+	struct device dev;
+	int object_position;
+	u32 pdo;
+};
+
+static void pdo_release(struct device *dev)
+{
+	kfree(to_pdo(dev));
+}
+
+/* -------------------------------------------------------------------------- */
+/* Fixed Supply */
+
+static ssize_t
+dual_role_power_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & PDO_FIXED_DUAL_ROLE));
+}
+static DEVICE_ATTR_RO(dual_role_power);
+
+static ssize_t
+usb_suspend_supported_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & PDO_FIXED_SUSPEND));
+}
+static DEVICE_ATTR_RO(usb_suspend_supported);
+
+static ssize_t
+unconstrained_power_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & PDO_FIXED_EXTPOWER));
+}
+static DEVICE_ATTR_RO(unconstrained_power);
+
+static ssize_t
+usb_communication_capable_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & PDO_FIXED_USB_COMM));
+}
+static DEVICE_ATTR_RO(usb_communication_capable);
+
+static ssize_t
+dual_role_data_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & PDO_FIXED_DATA_SWAP));
+}
+static DEVICE_ATTR_RO(dual_role_data);
+
+static ssize_t
+unchunked_extended_messages_supported_show(struct device *dev,
+					   struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & PDO_FIXED_UNCHUNK_EXT));
+}
+static DEVICE_ATTR_RO(unchunked_extended_messages_supported);
+
+/*
+ * REVISIT: Peak Current requires access also to the RDO.
+static ssize_t
+peak_current_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	...
+}
+*/
+
+static ssize_t
+fast_role_swap_current_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", (to_pdo(dev)->pdo >> PDO_FIXED_FRS_CURR_SHIFT) & 3);
+}
+static DEVICE_ATTR_RO(fast_role_swap_current);
+
+static ssize_t voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umV\n", pdo_fixed_voltage(to_pdo(dev)->pdo));
+}
+static DEVICE_ATTR_RO(voltage);
+
+/* Shared with Variable supplies, both source and sink */
+static ssize_t current_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umA\n", pdo_max_current(to_pdo(dev)->pdo));
+}
+
+/* Shared with Variable type supplies */
+static struct device_attribute maximum_current_attr = {
+	.attr = {
+		.name = "maximum_current",
+		.mode = 0444,
+	},
+	.show = current_show,
+};
+
+static struct device_attribute operational_current_attr = {
+	.attr = {
+		.name = "operational_current",
+		.mode = 0444,
+	},
+	.show = current_show,
+};
+
+static struct attribute *source_fixed_supply_attrs[] = {
+	&dev_attr_dual_role_power.attr,
+	&dev_attr_usb_suspend_supported.attr,
+	&dev_attr_unconstrained_power.attr,
+	&dev_attr_usb_communication_capable.attr,
+	&dev_attr_dual_role_data.attr,
+	&dev_attr_unchunked_extended_messages_supported.attr,
+	/*&dev_attr_peak_current.attr,*/
+	&dev_attr_voltage.attr,
+	&maximum_current_attr.attr,
+	NULL
+};
+
+static umode_t fixed_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+	if (to_pdo(kobj_to_dev(kobj))->object_position &&
+	    /*attr != &dev_attr_peak_current.attr &&*/
+	    attr != &dev_attr_voltage.attr &&
+	    attr != &maximum_current_attr.attr &&
+	    attr != &operational_current_attr.attr)
+		return 0;
+
+	return attr->mode;
+}
+
+static const struct attribute_group source_fixed_supply_group = {
+	.is_visible = fixed_attr_is_visible,
+	.attrs = source_fixed_supply_attrs,
+};
+__ATTRIBUTE_GROUPS(source_fixed_supply);
+
+static struct device_type source_fixed_supply_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = source_fixed_supply_groups,
+};
+
+static struct attribute *sink_fixed_supply_attrs[] = {
+	&dev_attr_dual_role_power.attr,
+	&dev_attr_unconstrained_power.attr,
+	&dev_attr_usb_communication_capable.attr,
+	&dev_attr_dual_role_data.attr,
+	&dev_attr_unchunked_extended_messages_supported.attr,
+	&dev_attr_fast_role_swap_current.attr,
+	&dev_attr_voltage.attr,
+	&operational_current_attr.attr,
+	NULL
+};
+
+static const struct attribute_group sink_fixed_supply_group = {
+	.is_visible = fixed_attr_is_visible,
+	.attrs = sink_fixed_supply_attrs,
+};
+__ATTRIBUTE_GROUPS(sink_fixed_supply);
+
+static struct device_type sink_fixed_supply_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = sink_fixed_supply_groups,
+};
+
+/* -------------------------------------------------------------------------- */
+/* Variable Supply */
+
+static ssize_t
+maximum_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umV\n", pdo_max_voltage(to_pdo(dev)->pdo));
+}
+static DEVICE_ATTR_RO(maximum_voltage);
+
+static ssize_t
+minimum_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umV\n", pdo_min_voltage(to_pdo(dev)->pdo));
+}
+static DEVICE_ATTR_RO(minimum_voltage);
+
+static struct attribute *source_variable_supply_attrs[] = {
+	&dev_attr_maximum_voltage.attr,
+	&dev_attr_minimum_voltage.attr,
+	&maximum_current_attr.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(source_variable_supply);
+
+static struct device_type source_variable_supply_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = source_variable_supply_groups,
+};
+
+static struct attribute *sink_variable_supply_attrs[] = {
+	&dev_attr_maximum_voltage.attr,
+	&dev_attr_minimum_voltage.attr,
+	&operational_current_attr.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(sink_variable_supply);
+
+static struct device_type sink_variable_supply_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = sink_variable_supply_groups,
+};
+
+/* -------------------------------------------------------------------------- */
+/* Battery */
+
+static ssize_t
+maximum_power_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umW\n", pdo_max_power(to_pdo(dev)->pdo));
+}
+static DEVICE_ATTR_RO(maximum_power);
+
+static ssize_t
+operational_power_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umW\n", pdo_max_power(to_pdo(dev)->pdo));
+}
+static DEVICE_ATTR_RO(operational_power);
+
+static struct attribute *source_battery_attrs[] = {
+	&dev_attr_maximum_voltage.attr,
+	&dev_attr_minimum_voltage.attr,
+	&dev_attr_maximum_power.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(source_battery);
+
+static struct device_type source_battery_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = source_battery_groups,
+};
+
+static struct attribute *sink_battery_attrs[] = {
+	&dev_attr_maximum_voltage.attr,
+	&dev_attr_minimum_voltage.attr,
+	&dev_attr_operational_power.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(sink_battery);
+
+static struct device_type sink_battery_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = sink_battery_groups,
+};
+
+/* -------------------------------------------------------------------------- */
+/* Standard Power Range (SPR) Programmable Power Supply (PPS) */
+
+static ssize_t
+pps_power_limited_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%u\n", !!(to_pdo(dev)->pdo & BIT(27)));
+}
+static DEVICE_ATTR_RO(pps_power_limited);
+
+static ssize_t
+pps_max_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umV\n", pdo_pps_apdo_max_voltage(to_pdo(dev)->pdo));
+}
+
+static ssize_t
+pps_min_voltage_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umV\n", pdo_pps_apdo_min_voltage(to_pdo(dev)->pdo));
+}
+
+static ssize_t
+pps_max_current_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%umA\n", pdo_pps_apdo_max_current(to_pdo(dev)->pdo));
+}
+
+static struct device_attribute pps_max_voltage_attr = {
+	.attr = {
+		.name = "maximum_voltage",
+		.mode = 0444,
+	},
+	.show = pps_max_voltage_show,
+};
+
+static struct device_attribute pps_min_voltage_attr = {
+	.attr = {
+		.name = "minimum_voltage",
+		.mode = 0444,
+	},
+	.show = pps_min_voltage_show,
+};
+
+static struct device_attribute pps_max_current_attr = {
+	.attr = {
+		.name = "maximum_current",
+		.mode = 0444,
+	},
+	.show = pps_max_current_show,
+};
+
+static struct attribute *source_pps_attrs[] = {
+	&dev_attr_pps_power_limited.attr,
+	&pps_max_voltage_attr.attr,
+	&pps_min_voltage_attr.attr,
+	&pps_max_current_attr.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(source_pps);
+
+static struct device_type source_pps_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = source_pps_groups,
+};
+
+static struct attribute *sink_pps_attrs[] = {
+	&pps_max_voltage_attr.attr,
+	&pps_min_voltage_attr.attr,
+	&pps_max_current_attr.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(sink_pps);
+
+static struct device_type sink_pps_type = {
+	.name = "pdo",
+	.release = pdo_release,
+	.groups = sink_pps_groups,
+};
+
+/* -------------------------------------------------------------------------- */
+
+static const char * const supply_name[] = {
+	[PDO_TYPE_FIXED] = "fixed_supply",
+	[PDO_TYPE_BATT]  = "battery",
+	[PDO_TYPE_VAR]	 = "variable_supply",
+};
+
+static const char * const apdo_supply_name[] = {
+	[APDO_TYPE_PPS]  = "programmable_supply",
+};
+
+static struct device_type *source_type[] = {
+	[PDO_TYPE_FIXED] = &source_fixed_supply_type,
+	[PDO_TYPE_BATT]  = &source_battery_type,
+	[PDO_TYPE_VAR]   = &source_variable_supply_type,
+};
+
+static struct device_type *source_apdo_type[] = {
+	[APDO_TYPE_PPS]  = &source_pps_type,
+};
+
+static struct device_type *sink_type[] = {
+	[PDO_TYPE_FIXED] = &sink_fixed_supply_type,
+	[PDO_TYPE_BATT]  = &sink_battery_type,
+	[PDO_TYPE_VAR]   = &sink_variable_supply_type,
+};
+
+static struct device_type *sink_apdo_type[] = {
+	[APDO_TYPE_PPS]  = &sink_pps_type,
+};
+
+/* REVISIT: Export when EPR_*_Capabilities need to be supported. */
+static int add_pdo(struct usb_power_delivery_capabilities *cap, u32 pdo, int position)
+{
+	struct device_type *type;
+	const char *name;
+	struct pdo *p;
+	int ret;
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	p->pdo = pdo;
+	p->object_position = position;
+
+	if (pdo_type(pdo) == PDO_TYPE_APDO) {
+		/* FIXME: Only PPS supported for now! Skipping others. */
+		if (pdo_apdo_type(pdo) > APDO_TYPE_PPS) {
+			dev_warn(&cap->dev, "Unknown APDO type. PDO 0x%08x\n", pdo);
+			kfree(p);
+			return 0;
+		}
+
+		if (is_source(cap->role))
+			type = source_apdo_type[pdo_apdo_type(pdo)];
+		else
+			type = sink_apdo_type[pdo_apdo_type(pdo)];
+
+		name = apdo_supply_name[pdo_apdo_type(pdo)];
+	} else {
+		if (is_source(cap->role))
+			type = source_type[pdo_type(pdo)];
+		else
+			type = sink_type[pdo_type(pdo)];
+
+		name = supply_name[pdo_type(pdo)];
+	}
+
+	p->dev.parent = &cap->dev;
+	p->dev.type = type;
+	dev_set_name(&p->dev, "%u:%s", position + 1, name);
+
+	ret = device_register(&p->dev);
+	if (ret) {
+		put_device(&p->dev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int remove_pdo(struct device *dev, void *data)
+{
+	device_unregister(dev);
+	return 0;
+}
+
+/* -------------------------------------------------------------------------- */
+
+static const char * const cap_name[] = {
+	[TYPEC_SINK]    = "sink-capabilities",
+	[TYPEC_SOURCE]  = "source-capabilities",
+};
+
+static void pd_capabilities_release(struct device *dev)
+{
+	kfree(to_usb_power_delivery_capabilities(dev));
+}
+
+static struct device_type pd_capabilities_type = {
+	.name = "capabilities",
+	.release = pd_capabilities_release,
+};
+
+/**
+ * usb_power_delivery_register_capabilities - Register a set of capabilities.
+ * @pd: The USB PD instance that the capabilities belong to.
+ * @desc: Description of the Capablities Message.
+ *
+ * This function registers a Capabilities Message described in @desc. The
+ * capabilities will have their own sub-directory under @pd in sysfs.
+ *
+ * The function returns pointer to struct usb_power_delivery_capabilities, or
+ * ERR_PRT(errno).
+ */
+struct usb_power_delivery_capabilities *
+usb_power_delivery_register_capabilities(struct usb_power_delivery *pd,
+					 struct usb_power_delivery_capabilities_desc *desc)
+{
+	struct usb_power_delivery_capabilities *cap;
+	int ret;
+	int i;
+
+	cap = kzalloc(sizeof(*cap), GFP_KERNEL);
+	if (!cap)
+		return ERR_PTR(-ENOMEM);
+
+	cap->pd = pd;
+	cap->role = desc->role;
+
+	cap->dev.parent = &pd->dev;
+	cap->dev.type = &pd_capabilities_type;
+	dev_set_name(&cap->dev, "%s", cap_name[cap->role]);
+
+	ret = device_register(&cap->dev);
+	if (ret) {
+		put_device(&cap->dev);
+		return ERR_PTR(ret);
+	}
+
+	for (i = 0; i < PDO_MAX_OBJECTS && desc->pdo[i]; i++) {
+		ret = add_pdo(cap, desc->pdo[i], i);
+		if (ret) {
+			usb_power_delivery_unregister_capabilities(cap);
+			return ERR_PTR(ret);
+		}
+	}
+
+	return cap;
+}
+EXPORT_SYMBOL_GPL(usb_power_delivery_register_capabilities);
+
+/**
+ * usb_power_delivery_unregister_capabilities - Unregister a set of capabilities
+ * @cap: The capabilities
+ */
+void usb_power_delivery_unregister_capabilities(struct usb_power_delivery_capabilities *cap)
+{
+	if (!cap)
+		return;
+
+	device_for_each_child(&cap->dev, NULL, remove_pdo);
+	device_unregister(&cap->dev);
+}
+EXPORT_SYMBOL_GPL(usb_power_delivery_unregister_capabilities);
+
+/* -------------------------------------------------------------------------- */
+
+static ssize_t revision_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_power_delivery *pd = to_usb_power_delivery(dev);
+
+	return sysfs_emit(buf, "%u.%u\n", (pd->revision >> 8) & 0xff, (pd->revision >> 4) & 0xf);
+}
+static DEVICE_ATTR_RO(revision);
+
+static ssize_t version_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_power_delivery *pd = to_usb_power_delivery(dev);
+
+	return sysfs_emit(buf, "%u.%u\n", (pd->version >> 8) & 0xff, (pd->version >> 4) & 0xf);
+}
+static DEVICE_ATTR_RO(version);
+
+static struct attribute *pd_attrs[] = {
+	&dev_attr_revision.attr,
+	&dev_attr_version.attr,
+	NULL
+};
+
+static umode_t pd_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+	struct usb_power_delivery *pd = to_usb_power_delivery(kobj_to_dev(kobj));
+
+	if (attr == &dev_attr_version.attr && !pd->version)
+		return 0;
+
+	return attr->mode;
+}
+
+static const struct attribute_group pd_group = {
+	.is_visible = pd_attr_is_visible,
+	.attrs = pd_attrs,
+};
+__ATTRIBUTE_GROUPS(pd);
+
+static void pd_release(struct device *dev)
+{
+	struct usb_power_delivery *pd = to_usb_power_delivery(dev);
+
+	ida_simple_remove(&pd_ida, pd->id);
+	kfree(pd);
+}
+
+static struct device_type pd_type = {
+	.name = "usb_power_delivery",
+	.release = pd_release,
+	.groups = pd_groups,
+};
+
+struct usb_power_delivery *usb_power_delivery_find(const char *name)
+{
+	struct device *dev;
+
+	dev = class_find_device_by_name(&pd_class, name);
+
+	return dev ? to_usb_power_delivery(dev) : NULL;
+}
+
+/**
+ * usb_power_delivery_register - Register USB Power Delivery Support.
+ * @parent: Parent device.
+ * @desc: Description of the USB PD contract.
+ *
+ * This routine can be used to register USB Power Delivery capabilities that a
+ * device or devices can support. These capabilities represent all the
+ * capabilities that can be negotiated with a partner, so not only the Power
+ * Capabilities that are negotiated using the USB PD Capabilities Message.
+ *
+ * The USB Power Delivery Support object that this routine generates can be used
+ * as the parent object for all the actual USB Power Delivery Messages and
+ * objects that can be negotiated with the partner.
+ *
+ * Returns handle to struct usb_power_delivery or ERR_PTR.
+ */
+struct usb_power_delivery *
+usb_power_delivery_register(struct device *parent, struct usb_power_delivery_desc *desc)
+{
+	struct usb_power_delivery *pd;
+	int ret;
+
+	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return ERR_PTR(-ENOMEM);
+
+	ret = ida_simple_get(&pd_ida, 0, 0, GFP_KERNEL);
+	if (ret < 0) {
+		kfree(pd);
+		return ERR_PTR(ret);
+	}
+
+	pd->id = ret;
+	pd->revision = desc->revision;
+	pd->version = desc->version;
+
+	pd->dev.parent = parent;
+	pd->dev.type = &pd_type;
+	pd->dev.class = &pd_class;
+	dev_set_name(&pd->dev, "pd%d", pd->id);
+
+	ret = device_register(&pd->dev);
+	if (ret) {
+		put_device(&pd->dev);
+		return ERR_PTR(ret);
+	}
+
+	return pd;
+}
+EXPORT_SYMBOL_GPL(usb_power_delivery_register);
+
+/**
+ * usb_power_delivery_unregister - Unregister USB Power Delivery Support.
+ * @pd: The USB PD contract.
+ */
+void usb_power_delivery_unregister(struct usb_power_delivery *pd)
+{
+	if (IS_ERR_OR_NULL(pd))
+		return;
+
+	device_unregister(&pd->dev);
+}
+EXPORT_SYMBOL_GPL(usb_power_delivery_unregister);
+
+/**
+ * usb_power_delivery_link_device - Link device to its USB PD object.
+ * @pd: The USB PD instance.
+ * @dev: The device.
+ *
+ * This function can be used to create a symlink named "usb_power_delivery" for
+ * @dev that points to @pd.
+ */
+int usb_power_delivery_link_device(struct usb_power_delivery *pd, struct device *dev)
+{
+	int ret;
+
+	if (IS_ERR_OR_NULL(pd) || !dev)
+		return 0;
+
+	ret = sysfs_create_link(&dev->kobj, &pd->dev.kobj, "usb_power_delivery");
+	if (ret)
+		return ret;
+
+	get_device(&pd->dev);
+	get_device(dev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_power_delivery_link_device);
+
+/**
+ * usb_power_delivery_unlink_device - Unlink device from its USB PD object.
+ * @pd: The USB PD instance.
+ * @dev: The device.
+ *
+ * Remove the symlink that was previously created with pd_link_device().
+ */
+void usb_power_delivery_unlink_device(struct usb_power_delivery *pd, struct device *dev)
+{
+	if (IS_ERR_OR_NULL(pd) || !dev)
+		return;
+
+	sysfs_remove_link(&dev->kobj, "usb_power_delivery");
+	put_device(&pd->dev);
+	put_device(dev);
+}
+EXPORT_SYMBOL_GPL(usb_power_delivery_unlink_device);
+
+/* -------------------------------------------------------------------------- */
+
+int __init usb_power_delivery_init(void)
+{
+	return class_register(&pd_class);
+}
+
+void __exit usb_power_delivery_exit(void)
+{
+	ida_destroy(&pd_ida);
+	class_unregister(&pd_class);
+}