Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * USB Role Switch Support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2018 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *         Hans de Goede <hdegoede@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/usb/role.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) static struct class *role_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) struct usb_role_switch {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	struct device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	struct mutex lock; /* device lock*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	enum usb_role role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	/* From descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct device *usb2_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct device *usb3_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct device *udc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	usb_role_switch_set_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	usb_role_switch_get_t get;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	bool allow_userspace_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define to_role_switch(d)	container_of(d, struct usb_role_switch, dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  * usb_role_switch_set_role - Set USB role for a switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  * @sw: USB role switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38)  * @role: USB role to be switched to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40)  * Set USB role @role for @sw.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	if (IS_ERR_OR_NULL(sw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	mutex_lock(&sw->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	ret = sw->set(sw, role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		sw->role = role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	mutex_unlock(&sw->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) EXPORT_SYMBOL_GPL(usb_role_switch_set_role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  * usb_role_switch_get_role - Get the USB role for a switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  * @sw: USB role switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67)  * Depending on the role-switch-driver this function returns either a cached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68)  * value of the last set role, or reads back the actual value from the hardware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	enum usb_role role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (IS_ERR_OR_NULL(sw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		return USB_ROLE_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	mutex_lock(&sw->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (sw->get)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		role = sw->get(sw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		role = sw->role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	mutex_unlock(&sw->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	return role;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static void *usb_role_switch_match(struct fwnode_handle *fwnode, const char *id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				   void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	if (id && !fwnode_property_present(fwnode, id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	dev = class_find_device_by_fwnode(role_class, fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static struct usb_role_switch *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) usb_role_switch_is_parent(struct fwnode_handle *fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	struct fwnode_handle *parent = fwnode_get_parent(fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (!parent || !fwnode_property_present(parent, "usb-role-switch"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	dev = class_find_device_by_fwnode(role_class, parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)  * usb_role_switch_get - Find USB role switch linked with the caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)  * @dev: The caller device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * Finds and returns role switch linked with @dev. The reference count for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * found switch is incremented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct usb_role_switch *usb_role_switch_get(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct usb_role_switch *sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	sw = usb_role_switch_is_parent(dev_fwnode(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (!sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		sw = device_connection_find_match(dev, "usb-role-switch", NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 						  usb_role_switch_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (!IS_ERR_OR_NULL(sw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) EXPORT_SYMBOL_GPL(usb_role_switch_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  * fwnode_usb_role_switch_get - Find USB role switch linked with the caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)  * @fwnode: The caller device node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * This is similar to the usb_role_switch_get() function above, but it searches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  * the switch using fwnode instead of device entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct usb_role_switch *fwnode_usb_role_switch_get(struct fwnode_handle *fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	struct usb_role_switch *sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	sw = usb_role_switch_is_parent(fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	if (!sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		sw = fwnode_connection_find_match(fwnode, "usb-role-switch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 						  NULL, usb_role_switch_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (!IS_ERR_OR_NULL(sw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	return sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  * usb_role_switch_put - Release handle to a switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)  * @sw: USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)  * Decrement reference count for @sw.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) void usb_role_switch_put(struct usb_role_switch *sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (!IS_ERR_OR_NULL(sw)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		module_put(sw->dev.parent->driver->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		put_device(&sw->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) EXPORT_SYMBOL_GPL(usb_role_switch_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)  * usb_role_switch_find_by_fwnode - Find USB role switch with its fwnode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * @fwnode: fwnode of the USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * Finds and returns role switch with @fwnode. The reference count for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  * found switch is incremented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct usb_role_switch *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) usb_role_switch_find_by_fwnode(const struct fwnode_handle *fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	if (!fwnode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	dev = class_find_device_by_fwnode(role_class, fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		WARN_ON(!try_module_get(dev->parent->driver->owner));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return dev ? to_role_switch(dev) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) EXPORT_SYMBOL_GPL(usb_role_switch_find_by_fwnode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) static umode_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) usb_role_switch_is_visible(struct kobject *kobj, struct attribute *attr, int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct device *dev = kobj_to_dev(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	struct usb_role_switch *sw = to_role_switch(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (sw->allow_userspace_control)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static const char * const usb_roles[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	[USB_ROLE_NONE]		= "none",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	[USB_ROLE_HOST]		= "host",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	[USB_ROLE_DEVICE]	= "device",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) role_show(struct device *dev, struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	struct usb_role_switch *sw = to_role_switch(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	enum usb_role role = usb_role_switch_get_role(sw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	return sprintf(buf, "%s\n", usb_roles[role]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static ssize_t role_store(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			  const char *buf, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	struct usb_role_switch *sw = to_role_switch(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	ret = sysfs_match_string(usb_roles, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		bool res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		/* Extra check if the user wants to disable the switch */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		ret = kstrtobool(buf, &res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		if (ret || res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	ret = usb_role_switch_set_role(sw, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static DEVICE_ATTR_RW(role);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static struct attribute *usb_role_switch_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	&dev_attr_role.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static const struct attribute_group usb_role_switch_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	.is_visible = usb_role_switch_is_visible,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	.attrs = usb_role_switch_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static const struct attribute_group *usb_role_switch_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	&usb_role_switch_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) usb_role_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	ret = add_uevent_var(env, "USB_ROLE_SWITCH=%s", dev_name(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		dev_err(dev, "failed to add uevent USB_ROLE_SWITCH\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static void usb_role_switch_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	struct usb_role_switch *sw = to_role_switch(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	kfree(sw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static const struct device_type usb_role_dev_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	.name = "usb_role_switch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	.groups = usb_role_switch_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	.uevent = usb_role_switch_uevent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	.release = usb_role_switch_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)  * usb_role_switch_register - Register USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)  * @parent: Parent device for the switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)  * @desc: Description of the switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)  * USB Role Switch is a device capable or choosing the role for USB connector.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)  * On platforms where the USB controller is dual-role capable, the controller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)  * driver will need to register the switch. On platforms where the USB host and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  * USB device controllers behind the connector are separate, there will be a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)  * mux, and the driver for that mux will need to register the switch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)  * Returns handle to a new role switch or ERR_PTR. The content of @desc is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)  * copied.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) struct usb_role_switch *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) usb_role_switch_register(struct device *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			 const struct usb_role_switch_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	struct usb_role_switch *sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (!desc || !desc->set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	sw = kzalloc(sizeof(*sw), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if (!sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	mutex_init(&sw->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	sw->allow_userspace_control = desc->allow_userspace_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	sw->usb2_port = desc->usb2_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	sw->usb3_port = desc->usb3_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	sw->udc = desc->udc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	sw->set = desc->set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	sw->get = desc->get;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	sw->dev.parent = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	sw->dev.fwnode = desc->fwnode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	sw->dev.class = role_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	sw->dev.type = &usb_role_dev_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	dev_set_drvdata(&sw->dev, desc->driver_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	dev_set_name(&sw->dev, "%s-role-switch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		     desc->name ? desc->name : dev_name(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	ret = device_register(&sw->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		put_device(&sw->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	/* TODO: Symlinks for the host port and the device controller. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	return sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) EXPORT_SYMBOL_GPL(usb_role_switch_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)  * usb_role_switch_unregister - Unregsiter USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)  * @sw: USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)  * Unregister switch that was registered with usb_role_switch_register().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) void usb_role_switch_unregister(struct usb_role_switch *sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	if (!IS_ERR_OR_NULL(sw))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		device_unregister(&sw->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) EXPORT_SYMBOL_GPL(usb_role_switch_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  * usb_role_switch_set_drvdata - Assign private data pointer to a switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  * @sw: USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)  * @data: Private data pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) void usb_role_switch_set_drvdata(struct usb_role_switch *sw, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	dev_set_drvdata(&sw->dev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) EXPORT_SYMBOL_GPL(usb_role_switch_set_drvdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)  * usb_role_switch_get_drvdata - Get the private data pointer of a switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)  * @sw: USB Role Switch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) void *usb_role_switch_get_drvdata(struct usb_role_switch *sw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	return dev_get_drvdata(&sw->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) EXPORT_SYMBOL_GPL(usb_role_switch_get_drvdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) static int __init usb_roles_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	role_class = class_create(THIS_MODULE, "usb_role");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	return PTR_ERR_OR_ZERO(role_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) subsys_initcall(usb_roles_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) static void __exit usb_roles_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	class_destroy(role_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) module_exit(usb_roles_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) MODULE_DESCRIPTION("USB Role Class");