[PATCH v8 2/4] gadget: Support for the usb charger framework

Baolin Wang
2016-03-24T12:37:10Z

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.

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 | 11 +++++++++++
include/linux/usb/gadget.h | 11 +++++++++++
2 files changed, 22 insertions(+)

diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c
index b86a6f0..3d9a489 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
@@ -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);
@@ -503,6 +513,7 @@ 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 d82d006..024b33d 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/usb_charger.h>

struct usb_ep;

@@ -563,6 +564,7 @@ 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 *);
};

/**
@@ -635,6 +637,8 @@ 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;
@@ -839,10 +843,17 @@ 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)
{
+ if (gadget->charger)
+ usb_charger_set_cur_limit_by_type(gadget->charger,
+ usb_charger_detect_type(gadget->charger), mA);
+
if (!gadget->ops->vbus_draw)
return -EOPNOTSUPP;
return gadget->ops->vbus_draw(gadget, mA);
--
1.7.9.5