For supporting the usb charger, it adds the usb_charger_init() and
usb_charger_exit() functions for usb charger initialization and exit.
It will report to the usb charger when the gadget state is changed,
then the usb charger can do the power things.
Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
drivers/usb/gadget/udc/udc-core.c | 11 +++++++++++
include/linux/usb/gadget.h | 13 +++++++++++++
2 files changed, 24 insertions(+)
diff --git a/drivers/usb/gadget/udc/udc-core.c
b/drivers/usb/gadget/udc/udc-core.c
index 4151597..3a37980 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/charger.h>
/**
* struct usb_udc - describes one usb device controller
@@ -230,6 +231,9 @@ static void usb_gadget_state_work(struct work_struct *work)
struct usb_gadget *gadget = work_to_gadget(work);
struct usb_udc *udc = gadget->udc;
+ /* when the gadget state is changed, then report to USB charger */
+ usb_charger_plug_by_gadget(gadget, gadget->state);
+
if (udc)
sysfs_notify(&udc->dev.kobj, NULL, "state");
}
@@ -423,8 +427,14 @@ 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);
@@ -533,6 +543,7 @@ 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 5d4e151..f82ed6b 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -24,6 +24,7 @@
#include <linux/types.h>
#include <linux/workqueue.h>
#include <linux/usb/ch9.h>
+#include <linux/usb/charger.h>
struct usb_ep;
@@ -639,6 +640,8 @@ struct usb_gadget {
unsigned out_epnum;
unsigned in_epnum;
struct usb_otg_caps *otg_caps;
+ /* negotiate the power with the usb charger */
+ struct usb_charger *charger;
unsigned sg_supported:1;
unsigned is_otg:1;
@@ -855,10 +858,20 @@ static inline int usb_gadget_vbus_connect(struct
usb_gadget *gadget)
* reporting how much power the device may consume. For example, this
* could affect how quickly batteries are recharged.
*
+ * It will also notify the USB charger how much power the device may
+ * consume if there is a USB charger linking with the gadget.
+ *
* Returns zero on success, else negative errno.
*/
static inline int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
+ enum usb_charger_type type;
+
+ if (gadget->charger) {
+ type = usb_charger_get_type(gadget->charger);
+ usb_charger_set_cur_limit_by_type(gadget->charger, type, mA);
+ }
+
if (!gadget->ops->vbus_draw)
return -EOPNOTSUPP;
return gadget->ops->vbus_draw(gadget, mA);
--
1.7.9.5
