* [PATCH v4 1/5] gadget: Introduce the notifier functions
2015-08-19 9:13 [PATCH v4 0/5] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
@ 2015-08-19 9:13 ` Baolin Wang
2015-08-19 9:13 ` [PATCH v4 2/5] gadget: Introduce the usb charger framework Baolin Wang
` (3 subsequent siblings)
4 siblings, 0 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-19 9:13 UTC (permalink / raw)
To: balbi
Cc: broonie, linus.walleij, linux-kernel, baolin.wang, gregkh,
peter.chen, sojka, stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, dbaryshkov, dwmw2, sameo,
lee.jones, patches, linux-pm
The usb charger framework is based on usb gadget. The usb charger
need to be notified the state changing of usb gadget to confirm the
usb charger state.
Thus this patch adds a notifier mechanism for usb gadget to report a
event to usb charger when the usb gadget state is changed.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/usb/gadget/udc/udc-core.c | 32 ++++++++++++++++++++++++++++++++
include/linux/usb/gadget.h | 18 ++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index f660afb..4238fc3 100644
--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -129,6 +129,32 @@ void usb_gadget_giveback_request(struct usb_ep *ep,
}
EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
+int usb_gadget_register_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb)
+{
+ int ret;
+
+ mutex_lock(&gadget->lock);
+ ret = raw_notifier_chain_register(&gadget->nh, nb);
+ mutex_unlock(&gadget->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_register_notify);
+
+int usb_gadget_unregister_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb)
+{
+ int ret;
+
+ mutex_lock(&gadget->lock);
+ ret = raw_notifier_chain_unregister(&gadget->nh, nb);
+ mutex_unlock(&gadget->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(usb_gadget_unregister_notify);
+
/* ------------------------------------------------------------------------- */
/**
@@ -226,6 +252,10 @@ static void usb_gadget_state_work(struct work_struct *work)
struct usb_gadget *gadget = work_to_gadget(work);
struct usb_udc *udc = gadget->udc;
+ mutex_lock(&gadget->lock);
+ raw_notifier_call_chain(&gadget->nh, gadget->state, gadget);
+ mutex_unlock(&gadget->lock);
+
if (udc)
sysfs_notify(&udc->dev.kobj, NULL, "state");
}
@@ -364,6 +394,8 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
dev_set_name(&gadget->dev, "gadget");
INIT_WORK(&gadget->work, usb_gadget_state_work);
+ RAW_INIT_NOTIFIER_HEAD(&gadget->nh);
+ mutex_init(&gadget->lock);
gadget->dev.parent = parent;
#ifdef CONFIG_HAS_DMA
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index c14a69b..755e8bc 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -609,6 +609,8 @@ struct usb_gadget {
unsigned out_epnum;
unsigned in_epnum;
struct usb_otg_caps *otg_caps;
+ struct raw_notifier_head nh;
+ struct mutex lock;
unsigned sg_supported:1;
unsigned is_otg:1;
@@ -1183,6 +1185,22 @@ extern void usb_gadget_unmap_request(struct usb_gadget *gadget,
/*-------------------------------------------------------------------------*/
+/**
+ * Register a notifiee to get notified by any attach status changes from
+ * the usb gadget
+ */
+int usb_gadget_register_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb);
+
+/*-------------------------------------------------------------------------*/
+
+
+/* Unregister a notifiee from the usb gadget */
+int usb_gadget_unregister_notify(struct usb_gadget *gadget,
+ struct notifier_block *nb);
+
+/*-------------------------------------------------------------------------*/
+
/* utility to set gadget state properly */
extern void usb_gadget_set_state(struct usb_gadget *gadget,
--
1.7.9.5
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v4 2/5] gadget: Introduce the usb charger framework
2015-08-19 9:13 [PATCH v4 0/5] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
2015-08-19 9:13 ` [PATCH v4 1/5] gadget: Introduce the notifier functions Baolin Wang
@ 2015-08-19 9:13 ` Baolin Wang
2015-08-19 9:13 ` [PATCH v4 3/5] gadget: Support for " Baolin Wang
` (2 subsequent siblings)
4 siblings, 0 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-19 9:13 UTC (permalink / raw)
To: balbi
Cc: broonie, linus.walleij, linux-kernel, baolin.wang, gregkh,
peter.chen, sojka, stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, dbaryshkov, dwmw2, sameo,
lee.jones, patches, linux-pm
This patch introduces the usb charger driver based on usb gadget that
makes an enhancement to a power driver. It works well in practice but
that requires a system with suitable hardware.
The basic conception of the usb charger is that, when one usb charger
is added or removed by reporting from the usb gadget state change or
the extcon device state change, the usb charger will report to power
user to set the current limitation.
The usb charger will register notifiees on the usb gadget or the extcon
device to get notified the usb charger state.
Power user will register a notifiee on the usb charger to get notified
by status changes from the usb charger. It will report to power user
to set the current limitation when detecting the usb charger is added
or removed from extcon device state or usb gadget state.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/usb/gadget/Kconfig | 7 +
drivers/usb/gadget/Makefile | 1 +
drivers/usb/gadget/charger.c | 529 +++++++++++++++++++++++++++++++++++++++
include/linux/usb/usb_charger.h | 138 ++++++++++
4 files changed, 675 insertions(+)
create mode 100644 drivers/usb/gadget/charger.c
create mode 100644 include/linux/usb/usb_charger.h
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index bcf83c0..3d2b959 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -127,6 +127,13 @@ config USB_GADGET_STORAGE_NUM_BUFFERS
a module parameter as well.
If unsure, say 2.
+config USB_CHARGER
+ bool "USB charger support"
+ help
+ The usb charger driver based on the usb gadget that makes an
+ enhancement to a power driver which can set the current limitation
+ when the usb charger is added or removed.
+
source "drivers/usb/gadget/udc/Kconfig"
#
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 598a67d..1e421c1 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -10,3 +10,4 @@ libcomposite-y := usbstring.o config.o epautoconf.o
libcomposite-y += composite.o functions.o configfs.o u_f.o
obj-$(CONFIG_USB_GADGET) += udc/ function/ legacy/
+obj-$(CONFIG_USB_CHARGER) += charger.o
diff --git a/drivers/usb/gadget/charger.c b/drivers/usb/gadget/charger.c
new file mode 100644
index 0000000..35b46c1
--- /dev/null
+++ b/drivers/usb/gadget/charger.c
@@ -0,0 +1,529 @@
+/*
+ * charger.c -- USB charger driver
+ *
+ * Copyright (C) 2015 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/extcon.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/usb_charger.h>
+
+#define DEFAULT_CUR_PROTECT (50)
+#define DEFAULT_SDP_CUR_LIMIT (500 - DEFAULT_CUR_PROTECT)
+#define DEFAULT_DCP_CUR_LIMIT (1500 - DEFAULT_CUR_PROTECT)
+#define DEFAULT_CDP_CUR_LIMIT (1500 - DEFAULT_CUR_PROTECT)
+#define DEFAULT_ACA_CUR_LIMIT (1500 - DEFAULT_CUR_PROTECT)
+
+static DEFINE_IDA(usb_charger_ida);
+static struct bus_type usb_charger_subsys = {
+ .name = "usb-charger",
+ .dev_name = "usb-charger",
+};
+
+static struct usb_charger *dev_to_uchger(struct device *udev)
+{
+ return container_of(udev, struct usb_charger, dev);
+}
+
+static ssize_t cur_limit_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_charger *uchger = dev_to_uchger(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%d %d %d %d\n",
+ uchger->cur_limit.sdp_cur_limit,
+ uchger->cur_limit.dcp_cur_limit,
+ uchger->cur_limit.cdp_cur_limit,
+ uchger->cur_limit.aca_cur_limit);
+}
+
+static ssize_t cur_limit_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_charger *uchger = dev_to_uchger(dev);
+ struct usb_charger_cur_limit cur;
+ int ret;
+
+ ret = sscanf(buf, "%d %d %d %d",
+ &cur.sdp_cur_limit, &cur.dcp_cur_limit,
+ &cur.cdp_cur_limit, &cur.aca_cur_limit);
+ if (ret == 0)
+ return -EINVAL;
+
+ ret = usb_charger_set_cur_limit(uchger, &cur);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_RW(cur_limit);
+
+static struct attribute *usb_charger_attrs[] = {
+ &dev_attr_cur_limit.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(usb_charger);
+
+/*
+ * usb_charger_find_by_name - Get the usb charger device by name.
+ * @name - usb charger device name.
+ *
+ * return the instance of usb charger device, the device must be
+ * released with usb_charger_put().
+ */
+struct usb_charger *usb_charger_find_by_name(const char *name)
+{
+ struct device *udev;
+
+ if (!name)
+ return ERR_PTR(-EINVAL);
+
+ udev = bus_find_device_by_name(&usb_charger_subsys, NULL, name);
+ if (!udev)
+ return ERR_PTR(-ENODEV);
+
+ return dev_to_uchger(udev);
+}
+
+/*
+ * usb_charger_get() - Reference a usb charger.
+ * @uchger - usb charger
+ */
+struct usb_charger *usb_charger_get(struct usb_charger *uchger)
+{
+ return (uchger && get_device(&uchger->dev)) ? uchger : NULL;
+}
+
+/*
+ * usb_charger_put() - Dereference a usb charger.
+ * @uchger - charger to release
+ */
+void usb_charger_put(struct usb_charger *uchger)
+{
+ if (uchger)
+ put_device(&uchger->dev);
+}
+
+/*
+ * usb_charger_register_notify() - Register a notifiee to get notified by
+ * any attach status changes from the usb charger detection.
+ * @uchger - the usb charger device which is monitored.
+ * @nb - a notifier block to be registered.
+ */
+int usb_charger_register_notify(struct usb_charger *uchger,
+ struct notifier_block *nb)
+{
+ int ret;
+
+ if (!uchger || !nb)
+ return -EINVAL;
+
+ mutex_lock(&uchger->lock);
+ ret = raw_notifier_chain_register(&uchger->uchger_nh, nb);
+
+ /* Generate an initial notify so users start in the right state */
+ if (!ret) {
+ usb_charger_detect_type(uchger);
+ raw_notifier_call_chain(&uchger->uchger_nh,
+ usb_charger_get_cur_limit(uchger),
+ uchger);
+ }
+ mutex_unlock(&uchger->lock);
+
+ return ret;
+}
+
+/*
+ * usb_charger_unregister_notify() - Unregister a notifiee from the usb charger.
+ * @uchger - the usb charger device which is monitored.
+ * @nb - a notifier block to be unregistered.
+ */
+int usb_charger_unregister_notify(struct usb_charger *uchger,
+ struct notifier_block *nb)
+{
+ int ret;
+
+ if (!uchger || !nb)
+ return -EINVAL;
+
+ mutex_lock(&uchger->lock);
+ ret = raw_notifier_chain_unregister(&uchger->uchger_nh, nb);
+ mutex_unlock(&uchger->lock);
+
+ return ret;
+}
+
+/*
+ * usb_charger_detect_type() - Get the usb charger type by the callback
+ * which is implemented by gadget operations.
+ * @uchger - the usb charger device.
+ *
+ * return the usb charger type.
+ */
+enum usb_charger_type
+usb_charger_detect_type(struct usb_charger *uchger)
+{
+ return uchger->type;
+}
+
+/*
+ * usb_charger_set_cur_limit() - Set the current limitation.
+ * @uchger - the usb charger device.
+ * @cur_limit_set - the current limitation.
+ */
+int usb_charger_set_cur_limit(struct usb_charger *uchger,
+ struct usb_charger_cur_limit *cur_limit_set)
+{
+ if (!uchger || !cur_limit_set)
+ return -EINVAL;
+
+ uchger->cur_limit.sdp_cur_limit = cur_limit_set->sdp_cur_limit;
+ uchger->cur_limit.dcp_cur_limit = cur_limit_set->dcp_cur_limit;
+ uchger->cur_limit.cdp_cur_limit = cur_limit_set->cdp_cur_limit;
+ uchger->cur_limit.aca_cur_limit = cur_limit_set->aca_cur_limit;
+ return 0;
+}
+
+/*
+ * usb_charger_get_cur_limit() - Get the current limitation by
+ * different usb charger type.
+ * @uchger - the usb charger device.
+ *
+ * return the current limitation to set.
+ */
+unsigned int
+usb_charger_get_cur_limit(struct usb_charger *uchger)
+{
+ enum usb_charger_type uchger_type = uchger->type;
+ unsigned int cur_limit;
+
+ switch (uchger_type) {
+ case SDP_TYPE:
+ cur_limit = uchger->cur_limit.sdp_cur_limit;
+ break;
+ case DCP_TYPE:
+ cur_limit = uchger->cur_limit.dcp_cur_limit;
+ break;
+ case CDP_TYPE:
+ cur_limit = uchger->cur_limit.cdp_cur_limit;
+ break;
+ case ACA_TYPE:
+ cur_limit = uchger->cur_limit.aca_cur_limit;
+ break;
+ default:
+ return 0;
+ }
+
+ return cur_limit;
+}
+
+/*
+ * usb_charger_notifier_others() - It will notify other device registered
+ * on usb charger when the usb charger state is changed.
+ * @uchger - the usb charger device.
+ * @state - the state of the usb charger.
+ */
+static void
+usb_charger_notify_others(struct usb_charger *uchger,
+ enum usb_charger_state state)
+{
+ mutex_lock(&uchger->lock);
+ uchger->state = state;
+
+ switch (state) {
+ case USB_CHARGER_PRESENT:
+ usb_charger_detect_type(uchger);
+ raw_notifier_call_chain(&uchger->uchger_nh,
+ usb_charger_get_cur_limit(uchger),
+ uchger);
+ break;
+ case USB_CHARGER_REMOVE:
+ uchger->type = UNKNOWN_TYPE;
+ raw_notifier_call_chain(&uchger->uchger_nh, 0, uchger);
+ break;
+ default:
+ dev_warn(&uchger->dev, "Unknown USB charger state: %d\n",
+ state);
+ break;
+ }
+ mutex_unlock(&uchger->lock);
+}
+
+/*
+ * usb_charger_plug_by_extcon() - The notifier call function which is registered
+ * on the extcon device.
+ * @nb - the notifier block that notified by extcon device.
+ * @state - the extcon device state.
+ * @data - here specify a extcon device.
+ *
+ * return the notify flag.
+ */
+static int
+usb_charger_plug_by_extcon(struct notifier_block *nb,
+ unsigned long state, void *data)
+{
+ struct usb_charger_nb *extcon_nb =
+ container_of(nb, struct usb_charger_nb, nb);
+ struct usb_charger *uchger = extcon_nb->uchger;
+ enum usb_charger_state uchger_state;
+
+ if (!uchger)
+ return NOTIFY_BAD;
+
+ /* Report event to power to setting the current limitation
+ * for this usb charger when one usb charger is added or removed
+ * with detecting by extcon device.
+ */
+ if (state)
+ uchger_state = USB_CHARGER_PRESENT;
+ else
+ uchger_state = USB_CHARGER_REMOVE;
+
+ usb_charger_notify_others(uchger, uchger_state);
+
+ return NOTIFY_OK;
+}
+
+/*
+ * usb_charger_plug_by_gadget() - Set the usb charger current limitation
+ * according to the usb gadget device state.
+ * @nb - the notifier block that notified by usb gadget device.
+ * @state - the usb gadget state.
+ * @data - here specify a usb gadget device.
+ */
+static int
+usb_charger_plug_by_gadget(struct notifier_block *nb,
+ unsigned long state, void *data)
+{
+ struct usb_charger *uchger = NULL;
+ enum usb_charger_state uchger_state;
+
+ if (!uchger)
+ return NOTIFY_BAD;
+
+ /* Report event to power to setting the current limitation
+ * for this usb charger when one usb charger state is changed
+ * with detecting by usb gadget state.
+ */
+ if (uchger->old_gadget_state != state) {
+ uchger->old_gadget_state = state;
+
+ if (state >= USB_STATE_ATTACHED)
+ uchger_state = USB_CHARGER_PRESENT;
+ else if (state == USB_STATE_NOTATTACHED)
+ uchger_state = USB_CHARGER_REMOVE;
+ else
+ uchger_state = USB_CHARGER_DEFAULT;
+
+ usb_charger_notify_others(uchger, uchger_state);
+ }
+
+ return NOTIFY_OK;
+}
+
+static int devm_uchger_dev_match(struct device *dev, void *res, void *data)
+{
+ struct usb_charger **r = res;
+
+ if (WARN_ON(!r || !*r))
+ return 0;
+
+ return *r == data;
+}
+
+static void usb_charger_release(struct device *dev)
+{
+ struct usb_charger *uchger = dev_get_drvdata(dev);
+
+ kfree(uchger);
+}
+
+/*
+ * usb_charger_unregister() - Unregister a usb charger device.
+ * @uchger - the usb charger to be unregistered.
+ */
+static int usb_charger_unregister(struct usb_charger *uchger)
+{
+ if (!uchger)
+ return -EINVAL;
+
+ device_unregister(&uchger->dev);
+ return 0;
+}
+
+static void devm_uchger_dev_unreg(struct device *dev, void *res)
+{
+ usb_charger_unregister(*(struct usb_charger **)res);
+}
+
+void devm_usb_charger_unregister(struct device *dev,
+ struct usb_charger *uchger)
+{
+ devres_release(dev, devm_uchger_dev_unreg,
+ devm_uchger_dev_match, uchger);
+}
+
+/*
+ * usb_charger_register() - Register a new usb charger device
+ * which is created by the usb charger framework.
+ * @parent - the parent device of the new usb charger.
+ * @uchger - the new usb charger device.
+ */
+static int usb_charger_register(struct device *parent,
+ struct usb_charger *uchger)
+{
+ int ret;
+
+ if (!uchger)
+ return -EINVAL;
+
+ uchger->dev.parent = parent;
+ uchger->dev.release = usb_charger_release;
+ uchger->dev.bus = &usb_charger_subsys;
+ uchger->dev.groups = usb_charger_groups;
+
+ ret = ida_simple_get(&usb_charger_ida, 0, 0, GFP_KERNEL);
+ if (ret < 0)
+ goto fail_ida;
+
+ uchger->id = ret;
+ dev_set_name(&uchger->dev, "usb-charger.%d", uchger->id);
+ dev_set_drvdata(&uchger->dev, uchger);
+
+ ret = device_register(&uchger->dev);
+ if (ret)
+ goto fail_register;
+
+ return 0;
+
+fail_register:
+ put_device(&uchger->dev);
+ ida_simple_remove(&usb_charger_ida, uchger->id);
+ uchger->id = -1;
+fail_ida:
+ dev_err(parent, "Failed to register usb charger: %d\n", ret);
+ return ret;
+}
+
+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;
+}
+
+int usb_charger_init(struct usb_gadget *ugadget)
+{
+ struct usb_charger *uchger;
+ struct extcon_dev *edev;
+ int ret;
+
+ if (!ugadget)
+ return -EINVAL;
+
+ uchger = kzalloc(sizeof(struct usb_charger), GFP_KERNEL);
+ if (!uchger)
+ return -ENOMEM;
+
+ uchger->type = UNKNOWN_TYPE;
+ uchger->state = USB_CHARGER_DEFAULT;
+ uchger->id = -1;
+ uchger->cur_limit.sdp_cur_limit = DEFAULT_SDP_CUR_LIMIT;
+ 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);
+ }
+
+ /* register a notifier on a usb gadget device */
+ uchger->gadget = ugadget;
+ uchger->old_gadget_state = ugadget->state;
+ uchger->gadget_nb.notifier_call = usb_charger_plug_by_gadget;
+ usb_gadget_register_notify(ugadget, &uchger->gadget_nb);
+
+ /* 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);
+
+ usb_gadget_unregister_notify(uchger->gadget, &uchger->gadget_nb);
+ kfree(uchger);
+ return ret;
+}
+
+int usb_charger_exit(struct usb_gadget *ugadget)
+{
+ struct usb_charger *uchger = NULL;
+
+ if (!uchger)
+ return -EINVAL;
+
+ if (uchger->extcon_dev)
+ extcon_unregister_notifier(uchger->extcon_dev,
+ EXTCON_USB, &uchger->extcon_nb.nb);
+
+ usb_gadget_unregister_notify(uchger->gadget, &uchger->gadget_nb);
+ ida_simple_remove(&usb_charger_ida, uchger->id);
+
+ return usb_charger_unregister(uchger);
+}
+
+static int __init usb_charger_sysfs_init(void)
+{
+ return subsys_system_register(&usb_charger_subsys, NULL);
+}
+core_initcall(usb_charger_sysfs_init);
+
+MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>");
+MODULE_DESCRIPTION("USB charger driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/usb_charger.h b/include/linux/usb/usb_charger.h
new file mode 100644
index 0000000..99bc26f
--- /dev/null
+++ b/include/linux/usb/usb_charger.h
@@ -0,0 +1,138 @@
+#ifndef __LINUX_USB_CHARGER_H__
+#define __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,
+};
+
+/* 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 */
+ 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;
+ struct notifier_block gadget_nb;
+
+ /* 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 unsigned int usb_charger_get_cur_limit(struct usb_charger *uchger);
+
+extern enum usb_charger_type usb_charger_detect_type(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 unsigned int
+usb_charger_get_cur_limit(struct usb_charger *uchger)
+{
+ return 0;
+}
+
+static inline enum usb_charger_type
+usb_charger_detect_type(struct usb_charger *uchger)
+{
+ return UNKNOWN_TYPE;
+}
+
+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__ */
--
1.7.9.5
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v4 3/5] gadget: Support for the usb charger framework
2015-08-19 9:13 [PATCH v4 0/5] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
2015-08-19 9:13 ` [PATCH v4 1/5] gadget: Introduce the notifier functions Baolin Wang
2015-08-19 9:13 ` [PATCH v4 2/5] gadget: Introduce the usb charger framework Baolin Wang
@ 2015-08-19 9:13 ` Baolin Wang
2015-08-19 12:56 ` Sergei Shtylyov
2015-08-19 9:13 ` [PATCH v4 4/5] gadget: Integrate with the usb gadget supporting for usb charger Baolin Wang
2015-08-19 9:13 ` [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management Baolin Wang
4 siblings, 1 reply; 15+ messages in thread
From: Baolin Wang @ 2015-08-19 9:13 UTC (permalink / raw)
To: balbi
Cc: broonie, linus.walleij, linux-kernel, baolin.wang, gregkh,
peter.chen, sojka, stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, dbaryshkov, dwmw2, sameo,
lee.jones, patches, linux-pm
For supporting the usb charger, it adds the usb_charger_init() and
usb_charger_exit() functions for usb charger initialization and exit.
Introduce a callback 'get_charger_type' which will implemented by
user for usb gadget operations to get the usb charger type.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/usb/gadget/udc/udc-core.c | 8 ++++++++
include/linux/usb/gadget.h | 2 ++
2 files changed, 10 insertions(+)
diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index 4238fc3..370376e 100644
--- a/drivers/usb/gadget/udc/udc-core.c
+++ b/drivers/usb/gadget/udc/udc-core.c
@@ -28,6 +28,7 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
+#include <linux/usb/usb_charger.h>
/**
* struct usb_udc - describes one usb device controller
@@ -437,8 +438,14 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
mutex_unlock(&udc_lock);
+ ret = usb_charger_init(gadget);
+ if (ret)
+ goto err5;
+
return 0;
+err5:
+ device_del(&udc->dev);
err4:
list_del(&udc->list);
mutex_unlock(&udc_lock);
@@ -513,6 +520,7 @@ void usb_del_gadget_udc(struct usb_gadget *gadget)
kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
flush_work(&gadget->work);
device_unregister(&udc->dev);
+ usb_charger_exit(gadget);
device_unregister(&gadget->dev);
}
EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 755e8bc..44d82f5 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -537,6 +537,7 @@ struct usb_gadget_ops {
struct usb_ep *(*match_ep)(struct usb_gadget *,
struct usb_endpoint_descriptor *,
struct usb_ss_ep_comp_descriptor *);
+ enum usb_charger_type (*get_charger_type)(struct usb_gadget *);
};
/**
@@ -611,6 +612,7 @@ struct usb_gadget {
struct usb_otg_caps *otg_caps;
struct raw_notifier_head nh;
struct mutex lock;
+ struct usb_charger *uchger;
unsigned sg_supported:1;
unsigned is_otg:1;
--
1.7.9.5
^ permalink raw reply related [flat|nested] 15+ messages in thread* Re: [PATCH v4 3/5] gadget: Support for the usb charger framework
2015-08-19 9:13 ` [PATCH v4 3/5] gadget: Support for " Baolin Wang
@ 2015-08-19 12:56 ` Sergei Shtylyov
2015-08-20 1:42 ` Baolin Wang
0 siblings, 1 reply; 15+ messages in thread
From: Sergei Shtylyov @ 2015-08-19 12:56 UTC (permalink / raw)
To: Baolin Wang, balbi
Cc: broonie, linus.walleij, linux-kernel, gregkh, peter.chen, sojka,
stern, r.baldyga, yoshihiro.shimoda.uh, linux-usb,
device-mainlining, sre, dbaryshkov, dwmw2, sameo, lee.jones,
patches, linux-pm
Hello.
On 8/19/2015 12:13 PM, Baolin Wang wrote:
> For supporting the usb charger, it adds the usb_charger_init() and
> usb_charger_exit() functions for usb charger initialization and exit.
>
> Introduce a callback 'get_charger_type' which will implemented by
> user for usb gadget operations to get the usb charger type.
>
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
[...]
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 755e8bc..44d82f5 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -537,6 +537,7 @@ struct usb_gadget_ops {
> struct usb_ep *(*match_ep)(struct usb_gadget *,
> struct usb_endpoint_descriptor *,
> struct usb_ss_ep_comp_descriptor *);
> + enum usb_charger_type (*get_charger_type)(struct usb_gadget *);
^^^ please use space, not tab here
> };
>
> /**
> @@ -611,6 +612,7 @@ struct usb_gadget {
> struct usb_otg_caps *otg_caps;
> struct raw_notifier_head nh;
> struct mutex lock;
> + struct usb_charger *uchger;
Why not simply call the field 'charger'? :-)
[...]
WBR, Sergei
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [PATCH v4 3/5] gadget: Support for the usb charger framework
2015-08-19 12:56 ` Sergei Shtylyov
@ 2015-08-20 1:42 ` Baolin Wang
0 siblings, 0 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-20 1:42 UTC (permalink / raw)
To: Sergei Shtylyov
Cc: Felipe Balbi, Mark Brown, Linus Walleij, LKML, Greg KH,
Peter Chen, sojka, Alan Stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, Dmitry Eremin-Solenikov,
David Woodhouse, sameo, Lee Jones, patches, linux-pm
On 19 August 2015 at 20:56, Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com> wrote:
> Hello.
>
> On 8/19/2015 12:13 PM, Baolin Wang wrote:
>
>> For supporting the usb charger, it adds the usb_charger_init() and
>> usb_charger_exit() functions for usb charger initialization and exit.
>>
>> Introduce a callback 'get_charger_type' which will implemented by
>> user for usb gadget operations to get the usb charger type.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
>
> [...]
>
>> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
>> index 755e8bc..44d82f5 100644
>> --- a/include/linux/usb/gadget.h
>> +++ b/include/linux/usb/gadget.h
>> @@ -537,6 +537,7 @@ struct usb_gadget_ops {
>> struct usb_ep *(*match_ep)(struct usb_gadget *,
>> struct usb_endpoint_descriptor *,
>> struct usb_ss_ep_comp_descriptor *);
>> + enum usb_charger_type (*get_charger_type)(struct usb_gadget *);
>
> ^^^ please use space, not tab here
OK.
>
>> };
>>
>> /**
>> @@ -611,6 +612,7 @@ struct usb_gadget {
>> struct usb_otg_caps *otg_caps;
>> struct raw_notifier_head nh;
>> struct mutex lock;
>> + struct usb_charger *uchger;
>
>
> Why not simply call the field 'charger'? :-)
I think 'uchger' is the abbreviation of 'usb charger' which is maybe a
little verbous, I'll change it. Thanks for your comments.
>
> [...]
>
> WBR, Sergei
>
--
Baolin.wang
Best Regards
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH v4 4/5] gadget: Integrate with the usb gadget supporting for usb charger
2015-08-19 9:13 [PATCH v4 0/5] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
` (2 preceding siblings ...)
2015-08-19 9:13 ` [PATCH v4 3/5] gadget: Support for " Baolin Wang
@ 2015-08-19 9:13 ` Baolin Wang
2015-08-19 9:13 ` [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management Baolin Wang
4 siblings, 0 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-19 9:13 UTC (permalink / raw)
To: balbi
Cc: broonie, linus.walleij, linux-kernel, baolin.wang, gregkh,
peter.chen, sojka, stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, dbaryshkov, dwmw2, sameo,
lee.jones, patches, linux-pm
When the usb gadget supporting for usb charger is ready, the usb charger
should get the type by the 'get_charger_type' callback which is implemented
by the usb gadget operations, and get the usb charger pointer from struct
'usb_gadget'.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/usb/gadget/charger.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/charger.c b/drivers/usb/gadget/charger.c
index 35b46c1..93fd36f 100644
--- a/drivers/usb/gadget/charger.c
+++ b/drivers/usb/gadget/charger.c
@@ -181,6 +181,13 @@ int usb_charger_unregister_notify(struct usb_charger *uchger,
enum usb_charger_type
usb_charger_detect_type(struct usb_charger *uchger)
{
+ if (uchger->gadget && uchger->gadget->ops
+ && uchger->gadget->ops->get_charger_type)
+ uchger->type =
+ uchger->gadget->ops->get_charger_type(uchger->gadget);
+ else
+ uchger->type = UNKNOWN_TYPE;
+
return uchger->type;
}
@@ -313,7 +320,8 @@ static int
usb_charger_plug_by_gadget(struct notifier_block *nb,
unsigned long state, void *data)
{
- struct usb_charger *uchger = NULL;
+ struct usb_gadget *gadget = (struct usb_gadget *)data;
+ struct usb_charger *uchger = gadget->uchger;
enum usb_charger_state uchger_state;
if (!uchger)
@@ -480,6 +488,7 @@ int usb_charger_init(struct usb_gadget *ugadget)
/* register a notifier on a usb gadget device */
uchger->gadget = ugadget;
+ ugadget->uchger = uchger;
uchger->old_gadget_state = ugadget->state;
uchger->gadget_nb.notifier_call = usb_charger_plug_by_gadget;
usb_gadget_register_notify(ugadget, &uchger->gadget_nb);
@@ -503,7 +512,7 @@ fail:
int usb_charger_exit(struct usb_gadget *ugadget)
{
- struct usb_charger *uchger = NULL;
+ struct usb_charger *uchger = ugadget->uchger;
if (!uchger)
return -EINVAL;
--
1.7.9.5
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management
2015-08-19 9:13 [PATCH v4 0/5] Introduce usb charger framework to deal with the usb gadget power negotation Baolin Wang
` (3 preceding siblings ...)
2015-08-19 9:13 ` [PATCH v4 4/5] gadget: Integrate with the usb gadget supporting for usb charger Baolin Wang
@ 2015-08-19 9:13 ` Baolin Wang
2015-08-19 9:56 ` Lee Jones
2015-08-19 16:24 ` Mark Brown
4 siblings, 2 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-19 9:13 UTC (permalink / raw)
To: balbi
Cc: broonie, linus.walleij, linux-kernel, baolin.wang, gregkh,
peter.chen, sojka, stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, dbaryshkov, dwmw2, sameo,
lee.jones, patches, linux-pm
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 <broonie@kernel.org>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
drivers/power/wm831x_power.c | 69 ++++++++++++++++++++++++++++++++++++++
include/linux/mfd/wm831x/pdata.h | 3 ++
2 files changed, 72 insertions(+)
diff --git a/drivers/power/wm831x_power.c b/drivers/power/wm831x_power.c
index db11ae6..72c661f 100644
--- a/drivers/power/wm831x_power.c
+++ b/drivers/power/wm831x_power.c
@@ -13,6 +13,7 @@
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
+#include <linux/usb/usb_charger.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/auxadc.h>
@@ -31,6 +32,8 @@ struct wm831x_power {
char usb_name[20];
char battery_name[20];
bool have_battery;
+ struct usb_charger *usb_charger;
+ struct notifier_block usb_notify;
};
static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
@@ -125,6 +128,43 @@ static enum power_supply_property wm831x_usb_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
};
+/* In miliamps */
+static 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);
+ 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 %dmA", wm831x_usb_limits[best]);
+
+ wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
+ WM831X_USB_ILIM_MASK, best);
+
+ return 0;
+}
+
/*********************************************************************
* Battery properties
*********************************************************************/
@@ -606,8 +646,31 @@ static int wm831x_power_probe(struct platform_device *pdev)
}
}
+ if (wm831x_pdata && wm831x_pdata->usb_gadget) {
+ power->usb_charger =
+ usb_charger_find_by_name(wm831x_pdata->usb_gadget);
+ if (IS_ERR(power->usb_charger)) {
+ ret = PTR_ERR(power->usb_charger);
+ dev_err(&pdev->dev,
+ "Failed to find USB gadget: %d\n", ret);
+ goto err_bat_irq;
+ }
+
+ power->usb_notify.notifier_call = wm831x_usb_limit_change;
+
+ ret = usb_charger_register_notify(power->usb_charger,
+ &power->usb_notify);
+ if (ret != 0) {
+ dev_err(&pdev->dev,
+ "Failed to register notifier: %d\n", ret);
+ goto err_usb_charger;
+ }
+ }
+
return ret;
+err_usb_charger:
+ usb_charger_put(power->usb_charger);
err_bat_irq:
--i;
for (; i >= 0; i--) {
@@ -637,6 +700,12 @@ static int wm831x_power_remove(struct platform_device *pdev)
struct wm831x *wm831x = wm831x_power->wm831x;
int irq, i;
+ if (wm831x_power->usb_charger) {
+ usb_charger_unregister_notify(wm831x_power->usb_charger,
+ &wm831x_power->usb_notify);
+ usb_charger_put(wm831x_power->usb_charger);
+ }
+
for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
irq = wm831x_irq(wm831x,
platform_get_irq_byname(pdev,
diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index dcc9631..5af8399 100644
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -126,6 +126,9 @@ struct wm831x_pdata {
/** The driver should initiate a power off sequence during shutdown */
bool soft_shutdown;
+ /** dev_name of USB charger gadget to integrate with */
+ const char *usb_gadget;
+
int irq_base;
int gpio_base;
int gpio_defaults[WM831X_GPIO_NUM];
--
1.7.9.5
^ permalink raw reply related [flat|nested] 15+ messages in thread* Re: [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management
2015-08-19 9:13 ` [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management Baolin Wang
@ 2015-08-19 9:56 ` Lee Jones
2015-08-19 10:27 ` Baolin Wang
2015-08-19 16:24 ` Mark Brown
1 sibling, 1 reply; 15+ messages in thread
From: Lee Jones @ 2015-08-19 9:56 UTC (permalink / raw)
To: Baolin Wang
Cc: balbi, broonie, linus.walleij, linux-kernel, gregkh, peter.chen,
sojka, stern, r.baldyga, yoshihiro.shimoda.uh, linux-usb,
device-mainlining, sre, dbaryshkov, dwmw2, sameo, patches,
linux-pm
On Wed, 19 Aug 2015, Baolin Wang wrote:
> 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 <broonie@kernel.org>
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
> ---
> drivers/power/wm831x_power.c | 69 ++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/wm831x/pdata.h | 3 ++
I'm not going to keep reviewing this. You should carry forward any
Acks received onto subsequent submissions yourself.
> 2 files changed, 72 insertions(+)
>
> diff --git a/drivers/power/wm831x_power.c b/drivers/power/wm831x_power.c
> index db11ae6..72c661f 100644
> --- a/drivers/power/wm831x_power.c
> +++ b/drivers/power/wm831x_power.c
> @@ -13,6 +13,7 @@
> #include <linux/platform_device.h>
> #include <linux/power_supply.h>
> #include <linux/slab.h>
> +#include <linux/usb/usb_charger.h>
>
> #include <linux/mfd/wm831x/core.h>
> #include <linux/mfd/wm831x/auxadc.h>
> @@ -31,6 +32,8 @@ struct wm831x_power {
> char usb_name[20];
> char battery_name[20];
> bool have_battery;
> + struct usb_charger *usb_charger;
> + struct notifier_block usb_notify;
> };
>
> static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
> @@ -125,6 +128,43 @@ static enum power_supply_property wm831x_usb_props[] = {
> POWER_SUPPLY_PROP_VOLTAGE_NOW,
> };
>
> +/* In miliamps */
> +static 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);
> + 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 %dmA", wm831x_usb_limits[best]);
> +
> + wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
> + WM831X_USB_ILIM_MASK, best);
> +
> + return 0;
> +}
> +
> /*********************************************************************
> * Battery properties
> *********************************************************************/
> @@ -606,8 +646,31 @@ static int wm831x_power_probe(struct platform_device *pdev)
> }
> }
>
> + if (wm831x_pdata && wm831x_pdata->usb_gadget) {
> + power->usb_charger =
> + usb_charger_find_by_name(wm831x_pdata->usb_gadget);
> + if (IS_ERR(power->usb_charger)) {
> + ret = PTR_ERR(power->usb_charger);
> + dev_err(&pdev->dev,
> + "Failed to find USB gadget: %d\n", ret);
> + goto err_bat_irq;
> + }
> +
> + power->usb_notify.notifier_call = wm831x_usb_limit_change;
> +
> + ret = usb_charger_register_notify(power->usb_charger,
> + &power->usb_notify);
> + if (ret != 0) {
> + dev_err(&pdev->dev,
> + "Failed to register notifier: %d\n", ret);
> + goto err_usb_charger;
> + }
> + }
> +
> return ret;
>
> +err_usb_charger:
> + usb_charger_put(power->usb_charger);
> err_bat_irq:
> --i;
> for (; i >= 0; i--) {
> @@ -637,6 +700,12 @@ static int wm831x_power_remove(struct platform_device *pdev)
> struct wm831x *wm831x = wm831x_power->wm831x;
> int irq, i;
>
> + if (wm831x_power->usb_charger) {
> + usb_charger_unregister_notify(wm831x_power->usb_charger,
> + &wm831x_power->usb_notify);
> + usb_charger_put(wm831x_power->usb_charger);
> + }
> +
> for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
> irq = wm831x_irq(wm831x,
> platform_get_irq_byname(pdev,
> diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
> index dcc9631..5af8399 100644
> --- a/include/linux/mfd/wm831x/pdata.h
> +++ b/include/linux/mfd/wm831x/pdata.h
> @@ -126,6 +126,9 @@ struct wm831x_pdata {
> /** The driver should initiate a power off sequence during shutdown */
> bool soft_shutdown;
>
> + /** dev_name of USB charger gadget to integrate with */
> + const char *usb_gadget;
> +
> int irq_base;
> int gpio_base;
> int gpio_defaults[WM831X_GPIO_NUM];
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
^ permalink raw reply [flat|nested] 15+ messages in thread* Re: [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management
2015-08-19 9:56 ` Lee Jones
@ 2015-08-19 10:27 ` Baolin Wang
0 siblings, 0 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-19 10:27 UTC (permalink / raw)
To: Lee Jones
Cc: Felipe Balbi, Mark Brown, Linus Walleij, LKML, Greg KH,
Peter Chen, sojka, Alan Stern, r.baldyga, yoshihiro.shimoda.uh,
linux-usb, device-mainlining, sre, Dmitry Eremin-Solenikov,
David Woodhouse, sameo, patches, linux-pm
On 19 August 2015 at 17:56, Lee Jones <lee.jones@linaro.org> wrote:
> On Wed, 19 Aug 2015, Baolin Wang wrote:
>
>> 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 <broonie@kernel.org>
>> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
>> ---
>> drivers/power/wm831x_power.c | 69 ++++++++++++++++++++++++++++++++++++++
>> include/linux/mfd/wm831x/pdata.h | 3 ++
>
> I'm not going to keep reviewing this. You should carry forward any
> Acks received onto subsequent submissions yourself.
>
OK, thanks.
>> 2 files changed, 72 insertions(+)
>>
>> diff --git a/drivers/power/wm831x_power.c b/drivers/power/wm831x_power.c
>> index db11ae6..72c661f 100644
>> --- a/drivers/power/wm831x_power.c
>> +++ b/drivers/power/wm831x_power.c
>> @@ -13,6 +13,7 @@
>> #include <linux/platform_device.h>
>> #include <linux/power_supply.h>
>> #include <linux/slab.h>
>> +#include <linux/usb/usb_charger.h>
>>
>> #include <linux/mfd/wm831x/core.h>
>> #include <linux/mfd/wm831x/auxadc.h>
>> @@ -31,6 +32,8 @@ struct wm831x_power {
>> char usb_name[20];
>> char battery_name[20];
>> bool have_battery;
>> + struct usb_charger *usb_charger;
>> + struct notifier_block usb_notify;
>> };
>>
>> static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
>> @@ -125,6 +128,43 @@ static enum power_supply_property wm831x_usb_props[] = {
>> POWER_SUPPLY_PROP_VOLTAGE_NOW,
>> };
>>
>> +/* In miliamps */
>> +static 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);
>> + 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 %dmA", wm831x_usb_limits[best]);
>> +
>> + wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE,
>> + WM831X_USB_ILIM_MASK, best);
>> +
>> + return 0;
>> +}
>> +
>> /*********************************************************************
>> * Battery properties
>> *********************************************************************/
>> @@ -606,8 +646,31 @@ static int wm831x_power_probe(struct platform_device *pdev)
>> }
>> }
>>
>> + if (wm831x_pdata && wm831x_pdata->usb_gadget) {
>> + power->usb_charger =
>> + usb_charger_find_by_name(wm831x_pdata->usb_gadget);
>> + if (IS_ERR(power->usb_charger)) {
>> + ret = PTR_ERR(power->usb_charger);
>> + dev_err(&pdev->dev,
>> + "Failed to find USB gadget: %d\n", ret);
>> + goto err_bat_irq;
>> + }
>> +
>> + power->usb_notify.notifier_call = wm831x_usb_limit_change;
>> +
>> + ret = usb_charger_register_notify(power->usb_charger,
>> + &power->usb_notify);
>> + if (ret != 0) {
>> + dev_err(&pdev->dev,
>> + "Failed to register notifier: %d\n", ret);
>> + goto err_usb_charger;
>> + }
>> + }
>> +
>> return ret;
>>
>> +err_usb_charger:
>> + usb_charger_put(power->usb_charger);
>> err_bat_irq:
>> --i;
>> for (; i >= 0; i--) {
>> @@ -637,6 +700,12 @@ static int wm831x_power_remove(struct platform_device *pdev)
>> struct wm831x *wm831x = wm831x_power->wm831x;
>> int irq, i;
>>
>> + if (wm831x_power->usb_charger) {
>> + usb_charger_unregister_notify(wm831x_power->usb_charger,
>> + &wm831x_power->usb_notify);
>> + usb_charger_put(wm831x_power->usb_charger);
>> + }
>> +
>> for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
>> irq = wm831x_irq(wm831x,
>> platform_get_irq_byname(pdev,
>> diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
>> index dcc9631..5af8399 100644
>> --- a/include/linux/mfd/wm831x/pdata.h
>> +++ b/include/linux/mfd/wm831x/pdata.h
>> @@ -126,6 +126,9 @@ struct wm831x_pdata {
>> /** The driver should initiate a power off sequence during shutdown */
>> bool soft_shutdown;
>>
>> + /** dev_name of USB charger gadget to integrate with */
>> + const char *usb_gadget;
>> +
>> int irq_base;
>> int gpio_base;
>> int gpio_defaults[WM831X_GPIO_NUM];
>
> --
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
--
Baolin.wang
Best Regards
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management
2015-08-19 9:13 ` [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management Baolin Wang
2015-08-19 9:56 ` Lee Jones
@ 2015-08-19 16:24 ` Mark Brown
2015-08-20 1:32 ` Baolin Wang
1 sibling, 1 reply; 15+ messages in thread
From: Mark Brown @ 2015-08-19 16:24 UTC (permalink / raw)
To: Baolin Wang
Cc: balbi, linus.walleij, linux-kernel, gregkh, peter.chen, sojka,
stern, r.baldyga, yoshihiro.shimoda.uh, linux-usb,
device-mainlining, sre, dbaryshkov, dwmw2, sameo, lee.jones,
patches, linux-pm
[-- Attachment #1: Type: text/plain, Size: 695 bytes --]
On Wed, Aug 19, 2015 at 05:13:48PM +0800, Baolin Wang wrote:
> 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 <broonie@kernel.org>
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
When people (like Charles and Lee have) have reviewed a change you
should add any tags they gave when you resend the change so they don't
have to duplicate their work and other people know that the review has
happened.
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 473 bytes --]
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH v4 5/5] power: wm831x_power: Support USB charger current limit management
2015-08-19 16:24 ` Mark Brown
@ 2015-08-20 1:32 ` Baolin Wang
0 siblings, 0 replies; 15+ messages in thread
From: Baolin Wang @ 2015-08-20 1:32 UTC (permalink / raw)
To: Mark Brown
Cc: Felipe Balbi, Linus Walleij, LKML, Greg KH, Peter Chen, sojka,
Alan Stern, r.baldyga, yoshihiro.shimoda.uh, linux-usb,
device-mainlining, sre, Dmitry Eremin-Solenikov, David Woodhouse,
sameo, Lee Jones, patches, linux-pm
On 20 August 2015 at 00:24, Mark Brown <broonie@kernel.org> wrote:
> On Wed, Aug 19, 2015 at 05:13:48PM +0800, Baolin Wang wrote:
>> 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 <broonie@kernel.org>
>> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
>
> When people (like Charles and Lee have) have reviewed a change you
> should add any tags they gave when you resend the change so they don't
> have to duplicate their work and other people know that the review has
> happened.
Make sense. Thanks.
--
Baolin.wang
Best Regards
^ permalink raw reply [flat|nested] 15+ messages in thread