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Date: Tue, 5 Apr 2016 15:56:12 +0800
From: Peter Chen <hzpeterchen@...il.com>
To: Baolin Wang <baolin.wang@...aro.org>
Cc: balbi@...nel.org, gregkh@...uxfoundation.org, sre@...nel.org,
dbaryshkov@...il.com, dwmw2@...radead.org,
peter.chen@...escale.com, stern@...land.harvard.edu,
r.baldyga@...sung.com, yoshihiro.shimoda.uh@...esas.com,
lee.jones@...aro.org, broonie@...nel.org,
ckeepax@...nsource.wolfsonmicro.com,
patches@...nsource.wolfsonmicro.com, linux-pm@...r.kernel.org,
linux-usb@...r.kernel.org,
device-mainlining@...ts.linuxfoundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 1/4] gadget: Introduce the usb charger framework
On Fri, Apr 01, 2016 at 03:21:49PM +0800, Baolin Wang wrote:
> +
> +int devm_usb_charger_register(struct device *dev,
> + struct usb_charger *uchger)
> +{
> + struct usb_charger **ptr;
> + int ret;
> +
> + ptr = devres_alloc(devm_uchger_dev_unreg, sizeof(*ptr), GFP_KERNEL);
> + if (!ptr)
> + return -ENOMEM;
> +
> + ret = usb_charger_register(dev, uchger);
> + if (ret) {
> + devres_free(ptr);
> + return ret;
> + }
> +
> + *ptr = uchger;
> + devres_add(dev, ptr);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(devm_usb_charger_register);
When the above API is expected to call? Can we use the USB charger
without USB gadget?
> +
> +int usb_charger_init(struct usb_gadget *ugadget)
> +{
> + struct usb_charger *uchger;
> + struct extcon_dev *edev;
> + struct power_supply *psy;
> + int ret;
> +
> + uchger = kzalloc(sizeof(struct usb_charger), GFP_KERNEL);
> + if (!uchger)
> + return -ENOMEM;
> +
> + uchger->type = UNKNOWN_TYPE;
> + uchger->state = USB_CHARGER_DEFAULT;
> + uchger->id = -1;
> +
> + if (ugadget->speed >= USB_SPEED_SUPER)
> + uchger->cur_limit.sdp_cur_limit = DEFAULT_SDP_CUR_LIMIT_SS;
> + else
> + uchger->cur_limit.sdp_cur_limit = DEFAULT_SDP_CUR_LIMIT;
We still haven't known bus speed here, it is better do it after
setting configuration has finished.
Peter
> + uchger->cur_limit.dcp_cur_limit = DEFAULT_DCP_CUR_LIMIT;
> + uchger->cur_limit.cdp_cur_limit = DEFAULT_CDP_CUR_LIMIT;
> + uchger->cur_limit.aca_cur_limit = DEFAULT_ACA_CUR_LIMIT;
> +
> + mutex_init(&uchger->lock);
> + RAW_INIT_NOTIFIER_HEAD(&uchger->uchger_nh);
> +
> + /* register a notifier on a extcon device if it is exsited */
> + edev = extcon_get_edev_by_phandle(ugadget->dev.parent, 0);
> + if (!IS_ERR_OR_NULL(edev)) {
> + uchger->extcon_dev = edev;
> + uchger->extcon_nb.nb.notifier_call = usb_charger_plug_by_extcon;
> + uchger->extcon_nb.uchger = uchger;
> + extcon_register_notifier(edev, EXTCON_USB,
> + &uchger->extcon_nb.nb);
> + }
> +
> + /* to check if the usb charger is link to a power supply */
> + psy = devm_power_supply_get_by_phandle(ugadget->dev.parent,
> + "power-supplies");
> + if (!IS_ERR_OR_NULL(psy))
> + uchger->psy = psy;
> + else
> + uchger->psy = NULL;
> +
> + /* register a notifier on a usb gadget device */
> + uchger->gadget = ugadget;
> + uchger->old_gadget_state = ugadget->state;
> +
> + /* register a new usb charger */
> + ret = usb_charger_register(&ugadget->dev, uchger);
> + if (ret)
> + goto fail;
> +
> + return 0;
> +
> +fail:
> + if (uchger->extcon_dev)
> + extcon_unregister_notifier(uchger->extcon_dev,
> + EXTCON_USB, &uchger->extcon_nb.nb);
> +
> + kfree(uchger);
> + return ret;
> +}
> +
> +int usb_charger_exit(struct usb_gadget *ugadget)
> +{
> + return 0;
> +}
> +
> +static int __init usb_charger_class_init(void)
> +{
> + usb_charger_class = class_create(THIS_MODULE, "usb_charger");
> + if (IS_ERR(usb_charger_class)) {
> + pr_err("couldn't create class\n");
> + return PTR_ERR(usb_charger_class);
> + }
> +
> + return 0;
> +}
> +
> +static void __exit usb_charger_class_exit(void)
> +{
> + class_destroy(usb_charger_class);
> +}
> +subsys_initcall(usb_charger_class_init);
> +module_exit(usb_charger_class_exit);
> +
> +MODULE_AUTHOR("Baolin Wang <baolin.wang@...aro.org>");
> +MODULE_DESCRIPTION("USB charger driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/usb/charger.h b/include/linux/usb/charger.h
> new file mode 100644
> index 0000000..1bf1d55
> --- /dev/null
> +++ b/include/linux/usb/charger.h
> @@ -0,0 +1,171 @@
> +#ifndef __LINUX_USB_CHARGER_H__
> +#define __LINUX_USB_CHARGER_H__
> +
> +#include <uapi/linux/usb/ch9.h>
> +#include <uapi/linux/usb/charger.h>
> +
> +/* Current limitation by charger type */
> +struct usb_charger_cur_limit {
> + unsigned int sdp_cur_limit;
> + unsigned int dcp_cur_limit;
> + unsigned int cdp_cur_limit;
> + unsigned int aca_cur_limit;
> +};
> +
> +struct usb_charger_nb {
> + struct notifier_block nb;
> + struct usb_charger *uchger;
> +};
> +
> +struct usb_charger {
> + struct device dev;
> + struct raw_notifier_head uchger_nh;
> + /* protect the notifier head and charger */
> + struct mutex lock;
> + int id;
> + enum usb_charger_type type;
> + enum usb_charger_state state;
> +
> + /* for supporting extcon usb gpio */
> + struct extcon_dev *extcon_dev;
> + struct usb_charger_nb extcon_nb;
> +
> + /* for supporting usb gadget */
> + struct usb_gadget *gadget;
> + enum usb_device_state old_gadget_state;
> +
> + /* for supporting power supply */
> + struct power_supply *psy;
> +
> + /* user can get charger type by implementing this callback */
> + enum usb_charger_type (*get_charger_type)(struct usb_charger *);
> + /*
> + * charger detection method can be implemented if you need to
> + * manually detect the charger type.
> + */
> + enum usb_charger_type (*charger_detect)(struct usb_charger *);
> +
> + /* current limitation */
> + struct usb_charger_cur_limit cur_limit;
> +};
> +
> +#ifdef CONFIG_USB_CHARGER
> +extern struct usb_charger *usb_charger_find_by_name(const char *name);
> +
> +extern struct usb_charger *usb_charger_get(struct usb_charger *uchger);
> +extern void usb_charger_put(struct usb_charger *uchger);
> +
> +extern int usb_charger_register_notify(struct usb_charger *uchger,
> + struct notifier_block *nb);
> +extern int usb_charger_unregister_notify(struct usb_charger *uchger,
> + struct notifier_block *nb);
> +
> +extern int usb_charger_set_cur_limit(struct usb_charger *uchger,
> + struct usb_charger_cur_limit *cur_limit_set);
> +extern int usb_charger_set_cur_limit_by_type(struct usb_charger *uchger,
> + enum usb_charger_type type,
> + unsigned int cur_limit);
> +extern unsigned int usb_charger_get_current(struct usb_charger *uchger);
> +
> +extern int usb_charger_plug_by_gadget(struct usb_gadget *gadget,
> + unsigned long state);
> +extern enum usb_charger_type usb_charger_get_type(struct usb_charger *uchger);
> +extern int usb_charger_detect_type(struct usb_charger *uchger);
> +
> +extern void devm_usb_charger_unregister(struct device *dev,
> + struct usb_charger *uchger);
> +extern int devm_usb_charger_register(struct device *dev,
> + struct usb_charger *uchger);
> +
> +extern int usb_charger_init(struct usb_gadget *ugadget);
> +extern int usb_charger_exit(struct usb_gadget *ugadget);
> +#else
> +static inline struct usb_charger *usb_charger_find_by_name(const char *name)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +
> +static inline struct usb_charger *usb_charger_get(struct usb_charger *uchger)
> +{
> + return NULL;
> +}
> +
> +static inline void usb_charger_put(struct usb_charger *uchger)
> +{
> +}
> +
> +static inline int
> +usb_charger_register_notify(struct usb_charger *uchger,
> + struct notifier_block *nb)
> +{
> + return 0;
> +}
> +
> +static inline int
> +usb_charger_unregister_notify(struct usb_charger *uchger,
> + struct notifier_block *nb)
> +{
> + return 0;
> +}
> +
> +static inline int
> +usb_charger_set_cur_limit(struct usb_charger *uchger,
> + struct usb_charger_cur_limit *cur_limit_set)
> +{
> + return 0;
> +}
> +
> +static inline int
> +usb_charger_set_cur_limit_by_type(struct usb_charger *uchger,
> + enum usb_charger_type type,
> + unsigned int cur_limit)
> +{
> + return 0;
> +}
> +
> +static inline unsigned int
> +usb_charger_get_current(struct usb_charger *uchger)
> +{
> + return 0;
> +}
> +
> +static inline enum usb_charger_type
> +usb_charger_get_type(struct usb_charger *uchger)
> +{
> + return UNKNOWN_TYPE;
> +}
> +
> +static inline int usb_charger_detect_type(struct usb_charger *uchger)
> +{
> + return 0;
> +}
> +
> +static inline int
> +usb_charger_plug_by_gadget(struct usb_gadget *gadget, unsigned long state)
> +{
> + return 0;
> +}
> +
> +static inline void devm_usb_charger_unregister(struct device *dev,
> + struct usb_charger *uchger)
> +{
> +}
> +
> +static inline int devm_usb_charger_register(struct device *dev,
> + struct usb_charger *uchger)
> +{
> + return 0;
> +}
> +
> +static inline int usb_charger_init(struct usb_gadget *ugadget)
> +{
> + return 0;
> +}
> +
> +static inline int usb_charger_exit(struct usb_gadget *ugadget)
> +{
> + return 0;
> +}
> +#endif
> +
> +#endif /* __LINUX_USB_CHARGER_H__ */
> diff --git a/include/uapi/linux/usb/charger.h b/include/uapi/linux/usb/charger.h
> new file mode 100644
> index 0000000..3c56ec4
> --- /dev/null
> +++ b/include/uapi/linux/usb/charger.h
> @@ -0,0 +1,31 @@
> +/*
> + * This file defines the USB charger type and state that are needed for
> + * USB device APIs.
> + */
> +
> +#ifndef _UAPI__LINUX_USB_CHARGER_H
> +#define _UAPI__LINUX_USB_CHARGER_H
> +
> +/*
> + * USB charger type:
> + * SDP (Standard Downstream Port)
> + * DCP (Dedicated Charging Port)
> + * CDP (Charging Downstream Port)
> + * ACA (Accessory Charger Adapters)
> + */
> +enum usb_charger_type {
> + UNKNOWN_TYPE,
> + SDP_TYPE,
> + DCP_TYPE,
> + CDP_TYPE,
> + ACA_TYPE,
> +};
> +
> +/* USB charger state */
> +enum usb_charger_state {
> + USB_CHARGER_DEFAULT,
> + USB_CHARGER_PRESENT,
> + USB_CHARGER_REMOVE,
> +};
> +
> +#endif /* _UAPI__LINUX_USB_CHARGER_H */
> --
> 1.7.9.5
>
> --
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--
Best Regards,
Peter Chen
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