From baolin.wang at linaro.org Tue Jun 27 07:49:33 2017 From: baolin.wang at linaro.org (Baolin Wang) Date: Tue, 27 Jun 2017 15:49:33 +0800 Subject: [Device-mainlining] [PATCH 1/3] include: uapi: usb: Introduce USB charger type and state definition In-Reply-To: References: Message-ID: <54d4a3ae584900a74e04b5cd27157dced44fdfef.1498548022.git.baolin.wang@linaro.org> Introducing USB charger type and state definition can help to support USB charging which will be added in USB phy core. Signed-off-by: Baolin Wang --- include/uapi/linux/usb/charger.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 include/uapi/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..5f72af3 --- /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_ABSENT, +}; + +#endif /* _UAPI__LINUX_USB_CHARGER_H */ -- 1.7.9.5 From baolin.wang at linaro.org Tue Jun 27 07:49:34 2017 From: baolin.wang at linaro.org (Baolin Wang) Date: Tue, 27 Jun 2017 15:49:34 +0800 Subject: [Device-mainlining] [PATCH 2/3] usb: phy: Add USB charger support In-Reply-To: <54d4a3ae584900a74e04b5cd27157dced44fdfef.1498548022.git.baolin.wang@linaro.org> References: <54d4a3ae584900a74e04b5cd27157dced44fdfef.1498548022.git.baolin.wang@linaro.org> Message-ID: This patch introduces the usb charger support based on usb phy that makes an enhancement to a power driver. The basic conception of the usb charger is that, when one usb charger is added or removed by reporting from the extcon device state change, the usb charger will report to power user to set the current limitation. Power user can register a notifiee on the usb phy by issuing usb_register_notifier() to get notified by charger status changes or charger current changes. we can notify what current to be drawn to power user according to different charger type, and now we have 2 methods to get charger type. One is get charger type from extcon subsystem, which also means the charger state changes. Another is we can get the charger type from USB controller detecting or PMIC detecting, and the charger state changes should be told by issuing usb_phy_set_charger_state(). Signed-off-by: Baolin Wang --- drivers/usb/phy/phy.c | 265 +++++++++++++++++++++++++++++++++++++++++++++++ include/linux/usb/phy.h | 48 +++++++++ 2 files changed, 313 insertions(+) diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c index 032f5af..db72802 100644 --- a/drivers/usb/phy/phy.c +++ b/drivers/usb/phy/phy.c @@ -18,6 +18,18 @@ #include +/* 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); @@ -77,6 +89,216 @@ static struct usb_phy *__of_usb_find_phy(struct device_node *node) 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); +} + +/** + * 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); + + 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); + 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; @@ -124,6 +346,44 @@ static int usb_add_extcon(struct usb_phy *x) "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) { @@ -145,6 +405,11 @@ static int usb_add_extcon(struct usb_phy *x) } } + 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; + return 0; } diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h index 2992451..bab4445a 100644 --- a/include/linux/usb/phy.h +++ b/include/linux/usb/phy.h @@ -12,6 +12,7 @@ #include #include #include +#include enum usb_phy_interface { USBPHY_INTERFACE_MODE_UNKNOWN, @@ -72,6 +73,17 @@ struct usb_phy_io_ops { int (*write)(struct usb_phy *x, u32 val, u32 reg); }; +struct usb_charger_current { + unsigned int sdp_min; + unsigned int sdp_max; + unsigned int dcp_min; + unsigned int dcp_max; + unsigned int cdp_min; + unsigned int cdp_max; + unsigned int aca_min; + unsigned int aca_max; +}; + struct usb_phy { struct device *dev; const char *label; @@ -91,6 +103,13 @@ struct usb_phy { struct extcon_dev *id_edev; struct notifier_block vbus_nb; struct notifier_block id_nb; + struct notifier_block type_nb; + + /* Support USB charger */ + enum usb_charger_type chg_type; + enum usb_charger_state chg_state; + struct usb_charger_current chg_cur; + struct work_struct chg_work; /* for notification of usb_phy_events */ struct atomic_notifier_head notifier; @@ -129,6 +148,12 @@ struct usb_phy { enum usb_device_speed speed); int (*notify_disconnect)(struct usb_phy *x, enum usb_device_speed speed); + + /* + * Charger detection method can be implemented if you need to + * manually detect the charger type. + */ + enum usb_charger_type (*charger_detect)(struct usb_phy *x); }; /** @@ -219,6 +244,12 @@ extern struct usb_phy *devm_usb_get_phy_by_node(struct device *dev, extern int usb_bind_phy(const char *dev_name, u8 index, const char *phy_dev_name); extern void usb_phy_set_event(struct usb_phy *x, unsigned long event); +extern void usb_phy_set_charger_current(struct usb_phy *usb_phy, + unsigned int mA); +extern void usb_phy_get_charger_current(struct usb_phy *usb_phy, + unsigned int *min, unsigned int *max); +extern void usb_phy_set_charger_state(struct usb_phy *usb_phy, + enum usb_charger_state state); #else static inline struct usb_phy *usb_get_phy(enum usb_phy_type type) { @@ -270,13 +301,30 @@ static inline int usb_bind_phy(const char *dev_name, u8 index, static inline void usb_phy_set_event(struct usb_phy *x, unsigned long event) { } + +void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA) +{ +} + +void usb_phy_get_charger_current(struct usb_phy *usb_phy, + unsigned int *min, unsigned int *max) +{ +} + +void usb_phy_set_charger_state(struct usb_phy *usb_phy, + enum usb_charger_state state) +{ +} #endif static inline int usb_phy_set_power(struct usb_phy *x, unsigned mA) { + usb_phy_set_charger_current(x, mA); + if (x && x->set_power) return x->set_power(x, mA); + return 0; } -- 1.7.9.5 From baolin.wang at linaro.org Tue Jun 27 07:49:35 2017 From: baolin.wang at linaro.org (Baolin Wang) Date: Tue, 27 Jun 2017 15:49:35 +0800 Subject: [Device-mainlining] [PATCH 3/3] power: wm831x_power: Support USB charger current limit management In-Reply-To: <54d4a3ae584900a74e04b5cd27157dced44fdfef.1498548022.git.baolin.wang@linaro.org> References: <54d4a3ae584900a74e04b5cd27157dced44fdfef.1498548022.git.baolin.wang@linaro.org> Message-ID: <86f990c6212d1d90a36e937736c01a7b131f6fcb.1498548022.git.baolin.wang@linaro.org> Integrate with the newly added USB charger interface to limit the current we draw from the USB input based on the input device configuration identified by the USB stack, allowing us to charge more quickly from high current inputs without drawing more current than specified from others. Signed-off-by: Mark Brown Signed-off-by: Baolin Wang --- drivers/power/supply/wm831x_power.c | 61 +++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/drivers/power/supply/wm831x_power.c b/drivers/power/supply/wm831x_power.c index 7082301..3e3480708 100644 --- a/drivers/power/supply/wm831x_power.c +++ b/drivers/power/supply/wm831x_power.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -31,6 +32,8 @@ struct wm831x_power { char usb_name[20]; char battery_name[20]; bool have_battery; + struct usb_phy *usb_phy; + struct notifier_block usb_notify; }; static int wm831x_power_check_online(struct wm831x *wm831x, int supply, @@ -125,6 +128,43 @@ static int wm831x_usb_get_prop(struct power_supply *psy, POWER_SUPPLY_PROP_VOLTAGE_NOW, }; +/* In milliamps */ +static const unsigned int wm831x_usb_limits[] = { + 0, + 2, + 100, + 500, + 900, + 1500, + 1800, + 550, +}; + +static int wm831x_usb_limit_change(struct notifier_block *nb, + unsigned long limit, void *data) +{ + struct wm831x_power *wm831x_power = container_of(nb, + struct wm831x_power, + usb_notify); + unsigned int i, best; + + /* Find the highest supported limit */ + best = 0; + for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) { + if (limit >= wm831x_usb_limits[i] && + wm831x_usb_limits[best] < wm831x_usb_limits[i]) + best = i; + } + + dev_dbg(wm831x_power->wm831x->dev, + "Limiting USB current to %umA", wm831x_usb_limits[best]); + + wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE, + WM831X_USB_ILIM_MASK, best); + + return 0; +} + /********************************************************************* * Battery properties *********************************************************************/ @@ -607,6 +647,22 @@ static int wm831x_power_probe(struct platform_device *pdev) } } + power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, + "usb-phy", 0); + if (IS_ERR(power->usb_phy)) { + ret = PTR_ERR(power->usb_phy); + dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret); + goto err_bat_irq; + } + + power->usb_notify.notifier_call = wm831x_usb_limit_change; + ret = usb_register_notifier(power->usb_phy, + &power->usb_notify); + if (ret) { + dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret); + goto err_bat_irq; + } + return ret; err_bat_irq: @@ -637,6 +693,11 @@ static int wm831x_power_remove(struct platform_device *pdev) struct wm831x *wm831x = wm831x_power->wm831x; int irq, i; + if (wm831x_power->usb_phy) { + usb_unregister_notifier(wm831x_power->usb_phy, + &wm831x_power->usb_notify); + } + for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) { irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, -- 1.7.9.5 From lkp at intel.com Wed Jun 28 02:44:30 2017 From: lkp at intel.com (kbuild test robot) Date: Wed, 28 Jun 2017 10:44:30 +0800 Subject: [Device-mainlining] [PATCH 2/3] usb: phy: Add USB charger support In-Reply-To: Message-ID: <201706281044.sD7wiJXZ%fengguang.wu@intel.com> Hi Baolin, [auto build test ERROR on balbi-usb/next] [also build test ERROR on next-20170627] [cannot apply to v4.12-rc7] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Baolin-Wang/include-uapi-usb-Introduce-USB-charger-type-and-state-definition/20170628-093530 base: https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next config: i386-randconfig-x076-06262345 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): drivers/power/supply/rt9455_charger.o: In function `usb_phy_set_charger_current': >> rt9455_charger.c:(.text+0x1660): multiple definition of `usb_phy_set_charger_current' drivers/power/supply/pda_power.o:pda_power.c:(.text+0xad0): first defined here drivers/power/supply/rt9455_charger.o: In function `usb_phy_get_charger_current': >> rt9455_charger.c:(.text+0x1670): multiple definition of `usb_phy_get_charger_current' drivers/power/supply/pda_power.o:pda_power.c:(.text+0xae0): first defined here drivers/power/supply/rt9455_charger.o: In function `usb_phy_set_charger_state': >> rt9455_charger.c:(.text+0x1680): multiple definition of `usb_phy_set_charger_state' drivers/power/supply/pda_power.o:pda_power.c:(.text+0xaf0): first defined here --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation -------------- next part -------------- A non-text attachment was scrubbed... Name: .config.gz Type: application/gzip Size: 25827 bytes Desc: not available URL: From baolin.wang at linaro.org Wed Jun 28 05:28:21 2017 From: baolin.wang at linaro.org (Baolin Wang) Date: Wed, 28 Jun 2017 13:28:21 +0800 Subject: [Device-mainlining] [PATCH 2/3] usb: phy: Add USB charger support In-Reply-To: <201706281044.sD7wiJXZ%fengguang.wu@intel.com> References: <201706281044.sD7wiJXZ%fengguang.wu@intel.com> Message-ID: Hi, On 28 June 2017 at 10:44, kbuild test robot wrote: > Hi Baolin, > > [auto build test ERROR on balbi-usb/next] > [also build test ERROR on next-20170627] > [cannot apply to v4.12-rc7] > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] > > url: https://github.com/0day-ci/linux/commits/Baolin-Wang/include-uapi-usb-Introduce-USB-charger-type-and-state-definition/20170628-093530 > base: https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next > config: i386-randconfig-x076-06262345 (attached as .config) > compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 > reproduce: > # save the attached .config to linux build tree > make ARCH=i386 > > All errors (new ones prefixed by >>): > > drivers/power/supply/rt9455_charger.o: In function `usb_phy_set_charger_current': >>> rt9455_charger.c:(.text+0x1660): multiple definition of `usb_phy_set_charger_current' > drivers/power/supply/pda_power.o:pda_power.c:(.text+0xad0): first defined here > drivers/power/supply/rt9455_charger.o: In function `usb_phy_get_charger_current': >>> rt9455_charger.c:(.text+0x1670): multiple definition of `usb_phy_get_charger_current' > drivers/power/supply/pda_power.o:pda_power.c:(.text+0xae0): first defined here > drivers/power/supply/rt9455_charger.o: In function `usb_phy_set_charger_state': >>> rt9455_charger.c:(.text+0x1680): multiple definition of `usb_phy_set_charger_state' > drivers/power/supply/pda_power.o:pda_power.c:(.text+0xaf0): first defined here Sorry for missing "static inline" for these exported functions, will fix in next version. -- Baolin.wang Best Regards