1 // SPDX-License-Identifier: GPL-2.0+
3 * phy.c -- USB phy handling
5 * Copyright (C) 2004-2013 Texas Instruments
7 #include <linux/kernel.h>
8 #include <linux/export.h>
10 #include <linux/device.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
15 #include <linux/usb/phy.h>
17 /* Default current range by charger type. */
18 #define DEFAULT_SDP_CUR_MIN 2
19 #define DEFAULT_SDP_CUR_MAX 500
20 #define DEFAULT_SDP_CUR_MIN_SS 150
21 #define DEFAULT_SDP_CUR_MAX_SS 900
22 #define DEFAULT_DCP_CUR_MIN 500
23 #define DEFAULT_DCP_CUR_MAX 5000
24 #define DEFAULT_CDP_CUR_MIN 1500
25 #define DEFAULT_CDP_CUR_MAX 5000
26 #define DEFAULT_ACA_CUR_MIN 1500
27 #define DEFAULT_ACA_CUR_MAX 5000
29 static LIST_HEAD(phy_list);
30 static LIST_HEAD(phy_bind_list);
31 static DEFINE_SPINLOCK(phy_lock);
35 struct notifier_block *nb;
38 static struct usb_phy *__usb_find_phy(struct list_head *list,
39 enum usb_phy_type type)
41 struct usb_phy *phy = NULL;
43 list_for_each_entry(phy, list, head) {
44 if (phy->type != type)
50 return ERR_PTR(-ENODEV);
53 static struct usb_phy *__usb_find_phy_dev(struct device *dev,
54 struct list_head *list, u8 index)
56 struct usb_phy_bind *phy_bind = NULL;
58 list_for_each_entry(phy_bind, list, list) {
59 if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
60 phy_bind->index == index) {
64 return ERR_PTR(-EPROBE_DEFER);
68 return ERR_PTR(-ENODEV);
71 static struct usb_phy *__of_usb_find_phy(struct device_node *node)
75 if (!of_device_is_available(node))
76 return ERR_PTR(-ENODEV);
78 list_for_each_entry(phy, &phy_list, head) {
79 if (node != phy->dev->of_node)
85 return ERR_PTR(-EPROBE_DEFER);
88 static void usb_phy_set_default_current(struct usb_phy *usb_phy)
90 usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN;
91 usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX;
92 usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN;
93 usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX;
94 usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN;
95 usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX;
96 usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN;
97 usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX;
101 * usb_phy_notify_charger_work - notify the USB charger state
102 * @work - the charger work to notify the USB charger state
104 * This work can be issued when USB charger state has been changed or
105 * USB charger current has been changed, then we can notify the current
106 * what can be drawn to power user and the charger state to userspace.
108 * If we get the charger type from extcon subsystem, we can notify the
109 * charger state to power user automatically by usb_phy_get_charger_type()
110 * issuing from extcon subsystem.
112 * If we get the charger type from ->charger_detect() instead of extcon
113 * subsystem, the usb phy driver should issue usb_phy_set_charger_state()
114 * to set charger state when the charger state has been changed.
116 static void usb_phy_notify_charger_work(struct work_struct *work)
118 struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work);
119 char uchger_state[50] = { 0 };
120 char *envp[] = { uchger_state, NULL };
121 unsigned int min, max;
123 switch (usb_phy->chg_state) {
124 case USB_CHARGER_PRESENT:
125 usb_phy_get_charger_current(usb_phy, &min, &max);
127 atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy);
128 snprintf(uchger_state, ARRAY_SIZE(uchger_state),
129 "USB_CHARGER_STATE=%s", "USB_CHARGER_PRESENT");
131 case USB_CHARGER_ABSENT:
132 usb_phy_set_default_current(usb_phy);
134 atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy);
135 snprintf(uchger_state, ARRAY_SIZE(uchger_state),
136 "USB_CHARGER_STATE=%s", "USB_CHARGER_ABSENT");
139 dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n",
144 kobject_uevent_env(&usb_phy->dev->kobj, KOBJ_CHANGE, envp);
147 static void __usb_phy_get_charger_type(struct usb_phy *usb_phy)
149 if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) {
150 usb_phy->chg_type = SDP_TYPE;
151 usb_phy->chg_state = USB_CHARGER_PRESENT;
152 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) {
153 usb_phy->chg_type = CDP_TYPE;
154 usb_phy->chg_state = USB_CHARGER_PRESENT;
155 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) {
156 usb_phy->chg_type = DCP_TYPE;
157 usb_phy->chg_state = USB_CHARGER_PRESENT;
158 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) {
159 usb_phy->chg_type = ACA_TYPE;
160 usb_phy->chg_state = USB_CHARGER_PRESENT;
162 usb_phy->chg_type = UNKNOWN_TYPE;
163 usb_phy->chg_state = USB_CHARGER_ABSENT;
166 schedule_work(&usb_phy->chg_work);
170 * usb_phy_get_charger_type - get charger type from extcon subsystem
171 * @nb -the notifier block to determine charger type
172 * @state - the cable state
173 * @data - private data
175 * Determin the charger type from extcon subsystem which also means the
176 * charger state has been chaned, then we should notify this event.
178 static int usb_phy_get_charger_type(struct notifier_block *nb,
179 unsigned long state, void *data)
181 struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb);
183 __usb_phy_get_charger_type(usb_phy);
188 * usb_phy_set_charger_current - set the USB charger current
189 * @usb_phy - the USB phy to be used
190 * @mA - the current need to be set
192 * Usually we only change the charger default current when USB finished the
193 * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power()
194 * will issue this function to change charger current when after setting USB
195 * configuration, or suspend/resume USB. For other type charger, we should
196 * use the default charger current and we do not suggest to issue this function
197 * to change the charger current.
199 * When USB charger current has been changed, we need to notify the power users.
201 void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA)
203 switch (usb_phy->chg_type) {
205 if (usb_phy->chg_cur.sdp_max == mA)
208 usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ?
209 DEFAULT_SDP_CUR_MAX_SS : mA;
212 if (usb_phy->chg_cur.dcp_max == mA)
215 usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ?
216 DEFAULT_DCP_CUR_MAX : mA;
219 if (usb_phy->chg_cur.cdp_max == mA)
222 usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ?
223 DEFAULT_CDP_CUR_MAX : mA;
226 if (usb_phy->chg_cur.aca_max == mA)
229 usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ?
230 DEFAULT_ACA_CUR_MAX : mA;
236 schedule_work(&usb_phy->chg_work);
238 EXPORT_SYMBOL_GPL(usb_phy_set_charger_current);
241 * usb_phy_get_charger_current - get the USB charger current
242 * @usb_phy - the USB phy to be used
243 * @min - the minimum current
244 * @max - the maximum current
246 * Usually we will notify the maximum current to power user, but for some
247 * special case, power user also need the minimum current value. Then the
248 * power user can issue this function to get the suitable current.
250 void usb_phy_get_charger_current(struct usb_phy *usb_phy,
251 unsigned int *min, unsigned int *max)
253 switch (usb_phy->chg_type) {
255 *min = usb_phy->chg_cur.sdp_min;
256 *max = usb_phy->chg_cur.sdp_max;
259 *min = usb_phy->chg_cur.dcp_min;
260 *max = usb_phy->chg_cur.dcp_max;
263 *min = usb_phy->chg_cur.cdp_min;
264 *max = usb_phy->chg_cur.cdp_max;
267 *min = usb_phy->chg_cur.aca_min;
268 *max = usb_phy->chg_cur.aca_max;
276 EXPORT_SYMBOL_GPL(usb_phy_get_charger_current);
279 * usb_phy_set_charger_state - set the USB charger state
280 * @usb_phy - the USB phy to be used
281 * @state - the new state need to be set for charger
283 * The usb phy driver can issue this function when the usb phy driver
284 * detected the charger state has been changed, in this case the charger
285 * type should be get from ->charger_detect().
287 void usb_phy_set_charger_state(struct usb_phy *usb_phy,
288 enum usb_charger_state state)
290 if (usb_phy->chg_state == state || !usb_phy->charger_detect)
293 usb_phy->chg_state = state;
294 if (usb_phy->chg_state == USB_CHARGER_PRESENT)
295 usb_phy->chg_type = usb_phy->charger_detect(usb_phy);
297 usb_phy->chg_type = UNKNOWN_TYPE;
299 schedule_work(&usb_phy->chg_work);
301 EXPORT_SYMBOL_GPL(usb_phy_set_charger_state);
303 static void devm_usb_phy_release(struct device *dev, void *res)
305 struct usb_phy *phy = *(struct usb_phy **)res;
310 static void devm_usb_phy_release2(struct device *dev, void *_res)
312 struct phy_devm *res = _res;
315 usb_unregister_notifier(res->phy, res->nb);
316 usb_put_phy(res->phy);
319 static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
321 struct usb_phy **phy = res;
323 return *phy == match_data;
326 static int usb_add_extcon(struct usb_phy *x)
330 if (of_property_read_bool(x->dev->of_node, "extcon")) {
331 x->edev = extcon_get_edev_by_phandle(x->dev, 0);
333 return PTR_ERR(x->edev);
335 x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
336 if (IS_ERR(x->id_edev)) {
338 dev_info(x->dev, "No separate ID extcon device\n");
341 if (x->vbus_nb.notifier_call) {
342 ret = devm_extcon_register_notifier(x->dev, x->edev,
347 "register VBUS notifier failed\n");
351 x->type_nb.notifier_call = usb_phy_get_charger_type;
353 ret = devm_extcon_register_notifier(x->dev, x->edev,
358 "register extcon USB SDP failed.\n");
362 ret = devm_extcon_register_notifier(x->dev, x->edev,
367 "register extcon USB CDP failed.\n");
371 ret = devm_extcon_register_notifier(x->dev, x->edev,
376 "register extcon USB DCP failed.\n");
380 ret = devm_extcon_register_notifier(x->dev, x->edev,
385 "register extcon USB ACA failed.\n");
390 if (x->id_nb.notifier_call) {
391 struct extcon_dev *id_ext;
398 ret = devm_extcon_register_notifier(x->dev, id_ext,
403 "register ID notifier failed\n");
409 usb_phy_set_default_current(x);
410 INIT_WORK(&x->chg_work, usb_phy_notify_charger_work);
411 x->chg_type = UNKNOWN_TYPE;
412 x->chg_state = USB_CHARGER_DEFAULT;
413 if (x->type_nb.notifier_call)
414 __usb_phy_get_charger_type(x);
420 * devm_usb_get_phy - find the USB PHY
421 * @dev - device that requests this phy
422 * @type - the type of the phy the controller requires
424 * Gets the phy using usb_get_phy(), and associates a device with it using
425 * devres. On driver detach, release function is invoked on the devres data,
426 * then, devres data is freed.
428 * For use by USB host and peripheral drivers.
430 struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
432 struct usb_phy **ptr, *phy;
434 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
436 return ERR_PTR(-ENOMEM);
438 phy = usb_get_phy(type);
441 devres_add(dev, ptr);
447 EXPORT_SYMBOL_GPL(devm_usb_get_phy);
450 * usb_get_phy - find the USB PHY
451 * @type - the type of the phy the controller requires
453 * Returns the phy driver, after getting a refcount to it; or
454 * -ENODEV if there is no such phy. The caller is responsible for
455 * calling usb_put_phy() to release that count.
457 * For use by USB host and peripheral drivers.
459 struct usb_phy *usb_get_phy(enum usb_phy_type type)
461 struct usb_phy *phy = NULL;
464 spin_lock_irqsave(&phy_lock, flags);
466 phy = __usb_find_phy(&phy_list, type);
467 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
468 pr_debug("PHY: unable to find transceiver of type %s\n",
469 usb_phy_type_string(type));
471 phy = ERR_PTR(-ENODEV);
476 get_device(phy->dev);
479 spin_unlock_irqrestore(&phy_lock, flags);
483 EXPORT_SYMBOL_GPL(usb_get_phy);
486 * devm_usb_get_phy_by_node - find the USB PHY by device_node
487 * @dev - device that requests this phy
488 * @node - the device_node for the phy device.
489 * @nb - a notifier_block to register with the phy.
491 * Returns the phy driver associated with the given device_node,
492 * after getting a refcount to it, -ENODEV if there is no such phy or
493 * -EPROBE_DEFER if the device is not yet loaded. While at that, it
494 * also associates the device with
495 * the phy using devres. On driver detach, release function is invoked
496 * on the devres data, then, devres data is freed.
498 * For use by peripheral drivers for devices related to a phy,
501 struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
502 struct device_node *node,
503 struct notifier_block *nb)
505 struct usb_phy *phy = ERR_PTR(-ENOMEM);
506 struct phy_devm *ptr;
509 ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
511 dev_dbg(dev, "failed to allocate memory for devres\n");
515 spin_lock_irqsave(&phy_lock, flags);
517 phy = __of_usb_find_phy(node);
523 if (!try_module_get(phy->dev->driver->owner)) {
524 phy = ERR_PTR(-ENODEV);
529 usb_register_notifier(phy, nb);
532 devres_add(dev, ptr);
534 get_device(phy->dev);
537 spin_unlock_irqrestore(&phy_lock, flags);
543 EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
546 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
547 * @dev - device that requests this phy
548 * @phandle - name of the property holding the phy phandle value
549 * @index - the index of the phy
551 * Returns the phy driver associated with the given phandle value,
552 * after getting a refcount to it, -ENODEV if there is no such phy or
553 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
554 * not yet loaded. While at that, it also associates the device with
555 * the phy using devres. On driver detach, release function is invoked
556 * on the devres data, then, devres data is freed.
558 * For use by USB host and peripheral drivers.
560 struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
561 const char *phandle, u8 index)
563 struct device_node *node;
567 dev_dbg(dev, "device does not have a device node entry\n");
568 return ERR_PTR(-EINVAL);
571 node = of_parse_phandle(dev->of_node, phandle, index);
573 dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle,
575 return ERR_PTR(-ENODEV);
577 phy = devm_usb_get_phy_by_node(dev, node, NULL);
581 EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
584 * usb_get_phy_dev - find the USB PHY
585 * @dev - device that requests this phy
586 * @index - the index of the phy
588 * Returns the phy driver, after getting a refcount to it; or
589 * -ENODEV if there is no such phy. The caller is responsible for
590 * calling usb_put_phy() to release that count.
592 * For use by USB host and peripheral drivers.
594 struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
596 struct usb_phy *phy = NULL;
599 spin_lock_irqsave(&phy_lock, flags);
601 phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
602 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
603 dev_dbg(dev, "unable to find transceiver\n");
605 phy = ERR_PTR(-ENODEV);
610 get_device(phy->dev);
613 spin_unlock_irqrestore(&phy_lock, flags);
617 EXPORT_SYMBOL_GPL(usb_get_phy_dev);
620 * devm_usb_get_phy_dev - find the USB PHY using device ptr and index
621 * @dev - device that requests this phy
622 * @index - the index of the phy
624 * Gets the phy using usb_get_phy_dev(), and associates a device with it using
625 * devres. On driver detach, release function is invoked on the devres data,
626 * then, devres data is freed.
628 * For use by USB host and peripheral drivers.
630 struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
632 struct usb_phy **ptr, *phy;
634 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
638 phy = usb_get_phy_dev(dev, index);
641 devres_add(dev, ptr);
647 EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
650 * devm_usb_put_phy - release the USB PHY
651 * @dev - device that wants to release this phy
652 * @phy - the phy returned by devm_usb_get_phy()
654 * destroys the devres associated with this phy and invokes usb_put_phy
655 * to release the phy.
657 * For use by USB host and peripheral drivers.
659 void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
663 r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
664 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
666 EXPORT_SYMBOL_GPL(devm_usb_put_phy);
669 * usb_put_phy - release the USB PHY
670 * @x: the phy returned by usb_get_phy()
672 * Releases a refcount the caller received from usb_get_phy().
674 * For use by USB host and peripheral drivers.
676 void usb_put_phy(struct usb_phy *x)
679 struct module *owner = x->dev->driver->owner;
685 EXPORT_SYMBOL_GPL(usb_put_phy);
688 * usb_add_phy - declare the USB PHY
689 * @x: the USB phy to be used; or NULL
690 * @type - the type of this PHY
692 * This call is exclusively for use by phy drivers, which
693 * coordinate the activities of drivers for host and peripheral
694 * controllers, and in some cases for VBUS current regulation.
696 int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
702 if (x->type != USB_PHY_TYPE_UNDEFINED) {
703 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
707 ret = usb_add_extcon(x);
711 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
713 spin_lock_irqsave(&phy_lock, flags);
715 list_for_each_entry(phy, &phy_list, head) {
716 if (phy->type == type) {
718 dev_err(x->dev, "transceiver type %s already exists\n",
719 usb_phy_type_string(type));
725 list_add_tail(&x->head, &phy_list);
728 spin_unlock_irqrestore(&phy_lock, flags);
731 EXPORT_SYMBOL_GPL(usb_add_phy);
734 * usb_add_phy_dev - declare the USB PHY
735 * @x: the USB phy to be used; or NULL
737 * This call is exclusively for use by phy drivers, which
738 * coordinate the activities of drivers for host and peripheral
739 * controllers, and in some cases for VBUS current regulation.
741 int usb_add_phy_dev(struct usb_phy *x)
743 struct usb_phy_bind *phy_bind;
748 dev_err(x->dev, "no device provided for PHY\n");
752 ret = usb_add_extcon(x);
756 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
758 spin_lock_irqsave(&phy_lock, flags);
759 list_for_each_entry(phy_bind, &phy_bind_list, list)
760 if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
763 list_add_tail(&x->head, &phy_list);
765 spin_unlock_irqrestore(&phy_lock, flags);
768 EXPORT_SYMBOL_GPL(usb_add_phy_dev);
771 * usb_remove_phy - remove the OTG PHY
772 * @x: the USB OTG PHY to be removed;
774 * This reverts the effects of usb_add_phy
776 void usb_remove_phy(struct usb_phy *x)
779 struct usb_phy_bind *phy_bind;
781 spin_lock_irqsave(&phy_lock, flags);
783 list_for_each_entry(phy_bind, &phy_bind_list, list)
784 if (phy_bind->phy == x)
785 phy_bind->phy = NULL;
788 spin_unlock_irqrestore(&phy_lock, flags);
790 EXPORT_SYMBOL_GPL(usb_remove_phy);
793 * usb_bind_phy - bind the phy and the controller that uses the phy
794 * @dev_name: the device name of the device that will bind to the phy
795 * @index: index to specify the port number
796 * @phy_dev_name: the device name of the phy
798 * Fills the phy_bind structure with the dev_name and phy_dev_name. This will
799 * be used when the phy driver registers the phy and when the controller
802 * To be used by platform specific initialization code.
804 int usb_bind_phy(const char *dev_name, u8 index,
805 const char *phy_dev_name)
807 struct usb_phy_bind *phy_bind;
810 phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
814 phy_bind->dev_name = dev_name;
815 phy_bind->phy_dev_name = phy_dev_name;
816 phy_bind->index = index;
818 spin_lock_irqsave(&phy_lock, flags);
819 list_add_tail(&phy_bind->list, &phy_bind_list);
820 spin_unlock_irqrestore(&phy_lock, flags);
824 EXPORT_SYMBOL_GPL(usb_bind_phy);
827 * usb_phy_set_event - set event to phy event
828 * @x: the phy returned by usb_get_phy();
830 * This sets event to phy event
832 void usb_phy_set_event(struct usb_phy *x, unsigned long event)
834 x->last_event = event;
836 EXPORT_SYMBOL_GPL(usb_phy_set_event);