![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
837 lines
21 KiB
C
837 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* phy.c -- USB phy handling
|
|
*
|
|
* Copyright (C) 2004-2013 Texas Instruments
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/err.h>
|
|
#include <linux/device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
|
|
#include <linux/usb/phy.h>
|
|
|
|
/* Default current range by charger type. */
|
|
#define DEFAULT_SDP_CUR_MIN 2
|
|
#define DEFAULT_SDP_CUR_MAX 500
|
|
#define DEFAULT_SDP_CUR_MIN_SS 150
|
|
#define DEFAULT_SDP_CUR_MAX_SS 900
|
|
#define DEFAULT_DCP_CUR_MIN 500
|
|
#define DEFAULT_DCP_CUR_MAX 5000
|
|
#define DEFAULT_CDP_CUR_MIN 1500
|
|
#define DEFAULT_CDP_CUR_MAX 5000
|
|
#define DEFAULT_ACA_CUR_MIN 1500
|
|
#define DEFAULT_ACA_CUR_MAX 5000
|
|
|
|
static LIST_HEAD(phy_list);
|
|
static LIST_HEAD(phy_bind_list);
|
|
static DEFINE_SPINLOCK(phy_lock);
|
|
|
|
struct phy_devm {
|
|
struct usb_phy *phy;
|
|
struct notifier_block *nb;
|
|
};
|
|
|
|
static struct usb_phy *__usb_find_phy(struct list_head *list,
|
|
enum usb_phy_type type)
|
|
{
|
|
struct usb_phy *phy = NULL;
|
|
|
|
list_for_each_entry(phy, list, head) {
|
|
if (phy->type != type)
|
|
continue;
|
|
|
|
return phy;
|
|
}
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static struct usb_phy *__usb_find_phy_dev(struct device *dev,
|
|
struct list_head *list, u8 index)
|
|
{
|
|
struct usb_phy_bind *phy_bind = NULL;
|
|
|
|
list_for_each_entry(phy_bind, list, list) {
|
|
if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
|
|
phy_bind->index == index) {
|
|
if (phy_bind->phy)
|
|
return phy_bind->phy;
|
|
else
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
}
|
|
}
|
|
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static struct usb_phy *__of_usb_find_phy(struct device_node *node)
|
|
{
|
|
struct usb_phy *phy;
|
|
|
|
if (!of_device_is_available(node))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
list_for_each_entry(phy, &phy_list, head) {
|
|
if (node != phy->dev->of_node)
|
|
continue;
|
|
|
|
return phy;
|
|
}
|
|
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
}
|
|
|
|
static void usb_phy_set_default_current(struct usb_phy *usb_phy)
|
|
{
|
|
usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN;
|
|
usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX;
|
|
usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN;
|
|
usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX;
|
|
usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN;
|
|
usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX;
|
|
usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN;
|
|
usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX;
|
|
}
|
|
|
|
/**
|
|
* usb_phy_notify_charger_work - notify the USB charger state
|
|
* @work - the charger work to notify the USB charger state
|
|
*
|
|
* This work can be issued when USB charger state has been changed or
|
|
* USB charger current has been changed, then we can notify the current
|
|
* what can be drawn to power user and the charger state to userspace.
|
|
*
|
|
* If we get the charger type from extcon subsystem, we can notify the
|
|
* charger state to power user automatically by usb_phy_get_charger_type()
|
|
* issuing from extcon subsystem.
|
|
*
|
|
* If we get the charger type from ->charger_detect() instead of extcon
|
|
* subsystem, the usb phy driver should issue usb_phy_set_charger_state()
|
|
* to set charger state when the charger state has been changed.
|
|
*/
|
|
static void usb_phy_notify_charger_work(struct work_struct *work)
|
|
{
|
|
struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work);
|
|
char uchger_state[50] = { 0 };
|
|
char *envp[] = { uchger_state, NULL };
|
|
unsigned int min, max;
|
|
|
|
switch (usb_phy->chg_state) {
|
|
case USB_CHARGER_PRESENT:
|
|
usb_phy_get_charger_current(usb_phy, &min, &max);
|
|
|
|
atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy);
|
|
snprintf(uchger_state, ARRAY_SIZE(uchger_state),
|
|
"USB_CHARGER_STATE=%s", "USB_CHARGER_PRESENT");
|
|
break;
|
|
case USB_CHARGER_ABSENT:
|
|
usb_phy_set_default_current(usb_phy);
|
|
|
|
atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy);
|
|
snprintf(uchger_state, ARRAY_SIZE(uchger_state),
|
|
"USB_CHARGER_STATE=%s", "USB_CHARGER_ABSENT");
|
|
break;
|
|
default:
|
|
dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n",
|
|
usb_phy->chg_state);
|
|
return;
|
|
}
|
|
|
|
kobject_uevent_env(&usb_phy->dev->kobj, KOBJ_CHANGE, envp);
|
|
}
|
|
|
|
static void __usb_phy_get_charger_type(struct usb_phy *usb_phy)
|
|
{
|
|
if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) {
|
|
usb_phy->chg_type = SDP_TYPE;
|
|
usb_phy->chg_state = USB_CHARGER_PRESENT;
|
|
} else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) {
|
|
usb_phy->chg_type = CDP_TYPE;
|
|
usb_phy->chg_state = USB_CHARGER_PRESENT;
|
|
} else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) {
|
|
usb_phy->chg_type = DCP_TYPE;
|
|
usb_phy->chg_state = USB_CHARGER_PRESENT;
|
|
} else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) {
|
|
usb_phy->chg_type = ACA_TYPE;
|
|
usb_phy->chg_state = USB_CHARGER_PRESENT;
|
|
} else {
|
|
usb_phy->chg_type = UNKNOWN_TYPE;
|
|
usb_phy->chg_state = USB_CHARGER_ABSENT;
|
|
}
|
|
|
|
schedule_work(&usb_phy->chg_work);
|
|
}
|
|
|
|
/**
|
|
* usb_phy_get_charger_type - get charger type from extcon subsystem
|
|
* @nb -the notifier block to determine charger type
|
|
* @state - the cable state
|
|
* @data - private data
|
|
*
|
|
* Determin the charger type from extcon subsystem which also means the
|
|
* charger state has been chaned, then we should notify this event.
|
|
*/
|
|
static int usb_phy_get_charger_type(struct notifier_block *nb,
|
|
unsigned long state, void *data)
|
|
{
|
|
struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb);
|
|
|
|
__usb_phy_get_charger_type(usb_phy);
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* usb_phy_set_charger_current - set the USB charger current
|
|
* @usb_phy - the USB phy to be used
|
|
* @mA - the current need to be set
|
|
*
|
|
* Usually we only change the charger default current when USB finished the
|
|
* enumeration as one SDP charger. As one SDP charger, usb_phy_set_power()
|
|
* will issue this function to change charger current when after setting USB
|
|
* configuration, or suspend/resume USB. For other type charger, we should
|
|
* use the default charger current and we do not suggest to issue this function
|
|
* to change the charger current.
|
|
*
|
|
* When USB charger current has been changed, we need to notify the power users.
|
|
*/
|
|
void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA)
|
|
{
|
|
switch (usb_phy->chg_type) {
|
|
case SDP_TYPE:
|
|
if (usb_phy->chg_cur.sdp_max == mA)
|
|
return;
|
|
|
|
usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ?
|
|
DEFAULT_SDP_CUR_MAX_SS : mA;
|
|
break;
|
|
case DCP_TYPE:
|
|
if (usb_phy->chg_cur.dcp_max == mA)
|
|
return;
|
|
|
|
usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ?
|
|
DEFAULT_DCP_CUR_MAX : mA;
|
|
break;
|
|
case CDP_TYPE:
|
|
if (usb_phy->chg_cur.cdp_max == mA)
|
|
return;
|
|
|
|
usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ?
|
|
DEFAULT_CDP_CUR_MAX : mA;
|
|
break;
|
|
case ACA_TYPE:
|
|
if (usb_phy->chg_cur.aca_max == mA)
|
|
return;
|
|
|
|
usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ?
|
|
DEFAULT_ACA_CUR_MAX : mA;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
schedule_work(&usb_phy->chg_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_set_charger_current);
|
|
|
|
/**
|
|
* usb_phy_get_charger_current - get the USB charger current
|
|
* @usb_phy - the USB phy to be used
|
|
* @min - the minimum current
|
|
* @max - the maximum current
|
|
*
|
|
* Usually we will notify the maximum current to power user, but for some
|
|
* special case, power user also need the minimum current value. Then the
|
|
* power user can issue this function to get the suitable current.
|
|
*/
|
|
void usb_phy_get_charger_current(struct usb_phy *usb_phy,
|
|
unsigned int *min, unsigned int *max)
|
|
{
|
|
switch (usb_phy->chg_type) {
|
|
case SDP_TYPE:
|
|
*min = usb_phy->chg_cur.sdp_min;
|
|
*max = usb_phy->chg_cur.sdp_max;
|
|
break;
|
|
case DCP_TYPE:
|
|
*min = usb_phy->chg_cur.dcp_min;
|
|
*max = usb_phy->chg_cur.dcp_max;
|
|
break;
|
|
case CDP_TYPE:
|
|
*min = usb_phy->chg_cur.cdp_min;
|
|
*max = usb_phy->chg_cur.cdp_max;
|
|
break;
|
|
case ACA_TYPE:
|
|
*min = usb_phy->chg_cur.aca_min;
|
|
*max = usb_phy->chg_cur.aca_max;
|
|
break;
|
|
default:
|
|
*min = 0;
|
|
*max = 0;
|
|
break;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_get_charger_current);
|
|
|
|
/**
|
|
* usb_phy_set_charger_state - set the USB charger state
|
|
* @usb_phy - the USB phy to be used
|
|
* @state - the new state need to be set for charger
|
|
*
|
|
* The usb phy driver can issue this function when the usb phy driver
|
|
* detected the charger state has been changed, in this case the charger
|
|
* type should be get from ->charger_detect().
|
|
*/
|
|
void usb_phy_set_charger_state(struct usb_phy *usb_phy,
|
|
enum usb_charger_state state)
|
|
{
|
|
if (usb_phy->chg_state == state || !usb_phy->charger_detect)
|
|
return;
|
|
|
|
usb_phy->chg_state = state;
|
|
if (usb_phy->chg_state == USB_CHARGER_PRESENT)
|
|
usb_phy->chg_type = usb_phy->charger_detect(usb_phy);
|
|
else
|
|
usb_phy->chg_type = UNKNOWN_TYPE;
|
|
|
|
schedule_work(&usb_phy->chg_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_set_charger_state);
|
|
|
|
static void devm_usb_phy_release(struct device *dev, void *res)
|
|
{
|
|
struct usb_phy *phy = *(struct usb_phy **)res;
|
|
|
|
usb_put_phy(phy);
|
|
}
|
|
|
|
static void devm_usb_phy_release2(struct device *dev, void *_res)
|
|
{
|
|
struct phy_devm *res = _res;
|
|
|
|
if (res->nb)
|
|
usb_unregister_notifier(res->phy, res->nb);
|
|
usb_put_phy(res->phy);
|
|
}
|
|
|
|
static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
|
|
{
|
|
struct usb_phy **phy = res;
|
|
|
|
return *phy == match_data;
|
|
}
|
|
|
|
static int usb_add_extcon(struct usb_phy *x)
|
|
{
|
|
int ret;
|
|
|
|
if (of_property_read_bool(x->dev->of_node, "extcon")) {
|
|
x->edev = extcon_get_edev_by_phandle(x->dev, 0);
|
|
if (IS_ERR(x->edev))
|
|
return PTR_ERR(x->edev);
|
|
|
|
x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
|
|
if (IS_ERR(x->id_edev)) {
|
|
x->id_edev = NULL;
|
|
dev_info(x->dev, "No separate ID extcon device\n");
|
|
}
|
|
|
|
if (x->vbus_nb.notifier_call) {
|
|
ret = devm_extcon_register_notifier(x->dev, x->edev,
|
|
EXTCON_USB,
|
|
&x->vbus_nb);
|
|
if (ret < 0) {
|
|
dev_err(x->dev,
|
|
"register VBUS notifier failed\n");
|
|
return ret;
|
|
}
|
|
} else {
|
|
x->type_nb.notifier_call = usb_phy_get_charger_type;
|
|
|
|
ret = devm_extcon_register_notifier(x->dev, x->edev,
|
|
EXTCON_CHG_USB_SDP,
|
|
&x->type_nb);
|
|
if (ret) {
|
|
dev_err(x->dev,
|
|
"register extcon USB SDP failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_extcon_register_notifier(x->dev, x->edev,
|
|
EXTCON_CHG_USB_CDP,
|
|
&x->type_nb);
|
|
if (ret) {
|
|
dev_err(x->dev,
|
|
"register extcon USB CDP failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_extcon_register_notifier(x->dev, x->edev,
|
|
EXTCON_CHG_USB_DCP,
|
|
&x->type_nb);
|
|
if (ret) {
|
|
dev_err(x->dev,
|
|
"register extcon USB DCP failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_extcon_register_notifier(x->dev, x->edev,
|
|
EXTCON_CHG_USB_ACA,
|
|
&x->type_nb);
|
|
if (ret) {
|
|
dev_err(x->dev,
|
|
"register extcon USB ACA failed.\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (x->id_nb.notifier_call) {
|
|
struct extcon_dev *id_ext;
|
|
|
|
if (x->id_edev)
|
|
id_ext = x->id_edev;
|
|
else
|
|
id_ext = x->edev;
|
|
|
|
ret = devm_extcon_register_notifier(x->dev, id_ext,
|
|
EXTCON_USB_HOST,
|
|
&x->id_nb);
|
|
if (ret < 0) {
|
|
dev_err(x->dev,
|
|
"register ID notifier failed\n");
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
usb_phy_set_default_current(x);
|
|
INIT_WORK(&x->chg_work, usb_phy_notify_charger_work);
|
|
x->chg_type = UNKNOWN_TYPE;
|
|
x->chg_state = USB_CHARGER_DEFAULT;
|
|
if (x->type_nb.notifier_call)
|
|
__usb_phy_get_charger_type(x);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* devm_usb_get_phy - find the USB PHY
|
|
* @dev - device that requests this phy
|
|
* @type - the type of the phy the controller requires
|
|
*
|
|
* Gets the phy using usb_get_phy(), and associates a device with it using
|
|
* devres. On driver detach, release function is invoked on the devres data,
|
|
* then, devres data is freed.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
|
|
{
|
|
struct usb_phy **ptr, *phy;
|
|
|
|
ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
phy = usb_get_phy(type);
|
|
if (!IS_ERR(phy)) {
|
|
*ptr = phy;
|
|
devres_add(dev, ptr);
|
|
} else
|
|
devres_free(ptr);
|
|
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_usb_get_phy);
|
|
|
|
/**
|
|
* usb_get_phy - find the USB PHY
|
|
* @type - the type of the phy the controller requires
|
|
*
|
|
* Returns the phy driver, after getting a refcount to it; or
|
|
* -ENODEV if there is no such phy. The caller is responsible for
|
|
* calling usb_put_phy() to release that count.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct usb_phy *usb_get_phy(enum usb_phy_type type)
|
|
{
|
|
struct usb_phy *phy = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
|
|
phy = __usb_find_phy(&phy_list, type);
|
|
if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
|
|
pr_debug("PHY: unable to find transceiver of type %s\n",
|
|
usb_phy_type_string(type));
|
|
if (!IS_ERR(phy))
|
|
phy = ERR_PTR(-ENODEV);
|
|
|
|
goto err0;
|
|
}
|
|
|
|
get_device(phy->dev);
|
|
|
|
err0:
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_get_phy);
|
|
|
|
/**
|
|
* devm_usb_get_phy_by_node - find the USB PHY by device_node
|
|
* @dev - device that requests this phy
|
|
* @node - the device_node for the phy device.
|
|
* @nb - a notifier_block to register with the phy.
|
|
*
|
|
* Returns the phy driver associated with the given device_node,
|
|
* after getting a refcount to it, -ENODEV if there is no such phy or
|
|
* -EPROBE_DEFER if the device is not yet loaded. While at that, it
|
|
* also associates the device with
|
|
* the phy using devres. On driver detach, release function is invoked
|
|
* on the devres data, then, devres data is freed.
|
|
*
|
|
* For use by peripheral drivers for devices related to a phy,
|
|
* such as a charger.
|
|
*/
|
|
struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
|
|
struct device_node *node,
|
|
struct notifier_block *nb)
|
|
{
|
|
struct usb_phy *phy = ERR_PTR(-ENOMEM);
|
|
struct phy_devm *ptr;
|
|
unsigned long flags;
|
|
|
|
ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr) {
|
|
dev_dbg(dev, "failed to allocate memory for devres\n");
|
|
goto err0;
|
|
}
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
|
|
phy = __of_usb_find_phy(node);
|
|
if (IS_ERR(phy)) {
|
|
devres_free(ptr);
|
|
goto err1;
|
|
}
|
|
|
|
if (!try_module_get(phy->dev->driver->owner)) {
|
|
phy = ERR_PTR(-ENODEV);
|
|
devres_free(ptr);
|
|
goto err1;
|
|
}
|
|
if (nb)
|
|
usb_register_notifier(phy, nb);
|
|
ptr->phy = phy;
|
|
ptr->nb = nb;
|
|
devres_add(dev, ptr);
|
|
|
|
get_device(phy->dev);
|
|
|
|
err1:
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
|
|
err0:
|
|
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
|
|
|
|
/**
|
|
* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
|
|
* @dev - device that requests this phy
|
|
* @phandle - name of the property holding the phy phandle value
|
|
* @index - the index of the phy
|
|
*
|
|
* Returns the phy driver associated with the given phandle value,
|
|
* after getting a refcount to it, -ENODEV if there is no such phy or
|
|
* -EPROBE_DEFER if there is a phandle to the phy, but the device is
|
|
* not yet loaded. While at that, it also associates the device with
|
|
* the phy using devres. On driver detach, release function is invoked
|
|
* on the devres data, then, devres data is freed.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
|
|
const char *phandle, u8 index)
|
|
{
|
|
struct device_node *node;
|
|
struct usb_phy *phy;
|
|
|
|
if (!dev->of_node) {
|
|
dev_dbg(dev, "device does not have a device node entry\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
node = of_parse_phandle(dev->of_node, phandle, index);
|
|
if (!node) {
|
|
dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle,
|
|
dev->of_node);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
phy = devm_usb_get_phy_by_node(dev, node, NULL);
|
|
of_node_put(node);
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
|
|
|
|
/**
|
|
* usb_get_phy_dev - find the USB PHY
|
|
* @dev - device that requests this phy
|
|
* @index - the index of the phy
|
|
*
|
|
* Returns the phy driver, after getting a refcount to it; or
|
|
* -ENODEV if there is no such phy. The caller is responsible for
|
|
* calling usb_put_phy() to release that count.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
|
|
{
|
|
struct usb_phy *phy = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
|
|
phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
|
|
if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
|
|
dev_dbg(dev, "unable to find transceiver\n");
|
|
if (!IS_ERR(phy))
|
|
phy = ERR_PTR(-ENODEV);
|
|
|
|
goto err0;
|
|
}
|
|
|
|
get_device(phy->dev);
|
|
|
|
err0:
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_get_phy_dev);
|
|
|
|
/**
|
|
* devm_usb_get_phy_dev - find the USB PHY using device ptr and index
|
|
* @dev - device that requests this phy
|
|
* @index - the index of the phy
|
|
*
|
|
* Gets the phy using usb_get_phy_dev(), and associates a device with it using
|
|
* devres. On driver detach, release function is invoked on the devres data,
|
|
* then, devres data is freed.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
|
|
{
|
|
struct usb_phy **ptr, *phy;
|
|
|
|
ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
phy = usb_get_phy_dev(dev, index);
|
|
if (!IS_ERR(phy)) {
|
|
*ptr = phy;
|
|
devres_add(dev, ptr);
|
|
} else
|
|
devres_free(ptr);
|
|
|
|
return phy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
|
|
|
|
/**
|
|
* devm_usb_put_phy - release the USB PHY
|
|
* @dev - device that wants to release this phy
|
|
* @phy - the phy returned by devm_usb_get_phy()
|
|
*
|
|
* destroys the devres associated with this phy and invokes usb_put_phy
|
|
* to release the phy.
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
|
|
{
|
|
int r;
|
|
|
|
r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
|
|
dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_usb_put_phy);
|
|
|
|
/**
|
|
* usb_put_phy - release the USB PHY
|
|
* @x: the phy returned by usb_get_phy()
|
|
*
|
|
* Releases a refcount the caller received from usb_get_phy().
|
|
*
|
|
* For use by USB host and peripheral drivers.
|
|
*/
|
|
void usb_put_phy(struct usb_phy *x)
|
|
{
|
|
if (x) {
|
|
struct module *owner = x->dev->driver->owner;
|
|
|
|
put_device(x->dev);
|
|
module_put(owner);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_put_phy);
|
|
|
|
/**
|
|
* usb_add_phy - declare the USB PHY
|
|
* @x: the USB phy to be used; or NULL
|
|
* @type - the type of this PHY
|
|
*
|
|
* This call is exclusively for use by phy drivers, which
|
|
* coordinate the activities of drivers for host and peripheral
|
|
* controllers, and in some cases for VBUS current regulation.
|
|
*/
|
|
int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
|
|
{
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
struct usb_phy *phy;
|
|
|
|
if (x->type != USB_PHY_TYPE_UNDEFINED) {
|
|
dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = usb_add_extcon(x);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
|
|
list_for_each_entry(phy, &phy_list, head) {
|
|
if (phy->type == type) {
|
|
ret = -EBUSY;
|
|
dev_err(x->dev, "transceiver type %s already exists\n",
|
|
usb_phy_type_string(type));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
x->type = type;
|
|
list_add_tail(&x->head, &phy_list);
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_add_phy);
|
|
|
|
/**
|
|
* usb_add_phy_dev - declare the USB PHY
|
|
* @x: the USB phy to be used; or NULL
|
|
*
|
|
* This call is exclusively for use by phy drivers, which
|
|
* coordinate the activities of drivers for host and peripheral
|
|
* controllers, and in some cases for VBUS current regulation.
|
|
*/
|
|
int usb_add_phy_dev(struct usb_phy *x)
|
|
{
|
|
struct usb_phy_bind *phy_bind;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (!x->dev) {
|
|
dev_err(x->dev, "no device provided for PHY\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = usb_add_extcon(x);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
list_for_each_entry(phy_bind, &phy_bind_list, list)
|
|
if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
|
|
phy_bind->phy = x;
|
|
|
|
list_add_tail(&x->head, &phy_list);
|
|
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_add_phy_dev);
|
|
|
|
/**
|
|
* usb_remove_phy - remove the OTG PHY
|
|
* @x: the USB OTG PHY to be removed;
|
|
*
|
|
* This reverts the effects of usb_add_phy
|
|
*/
|
|
void usb_remove_phy(struct usb_phy *x)
|
|
{
|
|
unsigned long flags;
|
|
struct usb_phy_bind *phy_bind;
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
if (x) {
|
|
list_for_each_entry(phy_bind, &phy_bind_list, list)
|
|
if (phy_bind->phy == x)
|
|
phy_bind->phy = NULL;
|
|
list_del(&x->head);
|
|
}
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_remove_phy);
|
|
|
|
/**
|
|
* usb_bind_phy - bind the phy and the controller that uses the phy
|
|
* @dev_name: the device name of the device that will bind to the phy
|
|
* @index: index to specify the port number
|
|
* @phy_dev_name: the device name of the phy
|
|
*
|
|
* Fills the phy_bind structure with the dev_name and phy_dev_name. This will
|
|
* be used when the phy driver registers the phy and when the controller
|
|
* requests this phy.
|
|
*
|
|
* To be used by platform specific initialization code.
|
|
*/
|
|
int usb_bind_phy(const char *dev_name, u8 index,
|
|
const char *phy_dev_name)
|
|
{
|
|
struct usb_phy_bind *phy_bind;
|
|
unsigned long flags;
|
|
|
|
phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
|
|
if (!phy_bind)
|
|
return -ENOMEM;
|
|
|
|
phy_bind->dev_name = dev_name;
|
|
phy_bind->phy_dev_name = phy_dev_name;
|
|
phy_bind->index = index;
|
|
|
|
spin_lock_irqsave(&phy_lock, flags);
|
|
list_add_tail(&phy_bind->list, &phy_bind_list);
|
|
spin_unlock_irqrestore(&phy_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_bind_phy);
|
|
|
|
/**
|
|
* usb_phy_set_event - set event to phy event
|
|
* @x: the phy returned by usb_get_phy();
|
|
*
|
|
* This sets event to phy event
|
|
*/
|
|
void usb_phy_set_event(struct usb_phy *x, unsigned long event)
|
|
{
|
|
x->last_event = event;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_phy_set_event);
|