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[209.132.180.67]) by mx.google.com with ESMTP id r7si12403050ple.505.2017.07.02.23.08.17; Sun, 02 Jul 2017 23:08:18 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.b=HbrocBgG; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752291AbdGCGIL (ORCPT + 25 others); Mon, 3 Jul 2017 02:08:11 -0400 Received: from mail-pf0-f182.google.com ([209.85.192.182]:35651 "EHLO mail-pf0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752220AbdGCGIF (ORCPT ); Mon, 3 Jul 2017 02:08:05 -0400 Received: by mail-pf0-f182.google.com with SMTP id c73so94981228pfk.2 for ; Sun, 02 Jul 2017 23:08:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=PS6THUi8/kmk9G2mqzXrD5EftL25PvXU2QfrtLfNxvQ=; b=HbrocBgGWfkiR5wyaK4FFdyv30sGLR9qPpXQOH2F0ybFO8cwsSYFXtlbD6xb5UdODj Mqt0DM8mdoTs/H6sEMN2ImE8pi0zIyNX1mDFOMJGUGCzdaeFqzaRd+GpCGiB5E4+bjN7 wKErC4vHVrWYJWFtcIdYVgBW8RJR/b94KLhoI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=PS6THUi8/kmk9G2mqzXrD5EftL25PvXU2QfrtLfNxvQ=; b=Vx/1FdIZT6cZjPXkCW+Fr77eE60bFsK6yPd/QxiQsyD09LsgfZTTkIIwxEZQhKnelr x95B/P0l7Bygl5QlAOQxqc7UmffrU8/kr2CQzK4O08EKrRm8Vo1sGMbtHwdWeSGx4Y27 RewGM6ZQtQc5H1x8MU/OSoIRjErcg5CosDgoAzpsnstvxIWlfbtnm5PKVTJzVlDWrkda 13q40M7mPEwo8gctr9GPb0jkCNE4I/kuxtNq5Xl3vrOaXs6B9357KNzsvOYlRfEyPHqx LoNAVqxA3xAndp8KmX8gpSrhNDm32sGIgVLrhZw0o70uIhKCKLKWmx3xu3LzBnlK0euD ifXw== X-Gm-Message-State: AIVw1109kYcF10cI7iUKMBGilBdEzRZdM369hiKUSRYhU3iJW48l/SxF AKcjmnE8D7MFWTtf X-Received: by 10.84.217.25 with SMTP id o25mr8820951pli.299.1499062084253; Sun, 02 Jul 2017 23:08:04 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id x64sm33177577pfk.20.2017.07.02.23.07.59 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 02 Jul 2017 23:08:03 -0700 (PDT) From: Baolin Wang To: balbi@kernel.org, gregkh@linuxfoundation.org, sre@kernel.org Cc: jun.li@nxp.com, peter.chen@freescale.com, broonie@kernel.org, john.stultz@linaro.org, neilb@suse.com, patches@opensource.wolfsonmicro.com, baolin.wang@linaro.org, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, device-mainlining@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/3] usb: phy: Add USB charger support Date: Mon, 3 Jul 2017 14:07:14 +0800 Message-Id: <9ccafadb156d1c7f6f5a06b86ed406bd6b60dee3.1499061617.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 | 49 +++++++++ 2 files changed, 314 insertions(+) -- 1.7.9.5 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..de881b1 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) { @@ -270,11 +301,29 @@ 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) { } + +static inline void usb_phy_set_charger_current(struct usb_phy *usb_phy, + unsigned int mA) +{ +} + +static inline void usb_phy_get_charger_current(struct usb_phy *usb_phy, + unsigned int *min, + unsigned int *max) +{ +} + +static inline 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;