[PATCH v18 2/4] usb: gadget: Support for the usb charger framework

Baolin Wang
2016-10-19T02:38:29Z

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.wang@linaro.org>
Reviewed-by: Li Jun <jun.li@nxp.com>
Tested-by: Li Jun <jun.li@nxp.com>
---
drivers/usb/gadget/udc/core.c | 19 ++++++++++++++++++-
include/linux/usb/gadget.h | 3 +++
2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 9483489..90df022 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -25,6 +25,7 @@
#include <linux/dma-mapping.h>
#include <linux/workqueue.h>

+#include <linux/usb/charger.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb.h>
@@ -576,12 +577,17 @@ EXPORT_SYMBOL_GPL(usb_gadget_vbus_connect);
* 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.
*/
int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
{
int ret = 0;

+ usb_charger_set_cur_limit_by_gadget(gadget, mA);
+
if (!gadget->ops->vbus_draw) {
ret = -EOPNOTSUPP;
goto out;
@@ -963,6 +969,9 @@ 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");
}
@@ -1132,6 +1141,10 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
if (ret)
goto err4;

+ ret = usb_charger_init(gadget);
+ if (ret)
+ goto err5;
+
usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
udc->vbus = true;

@@ -1143,7 +1156,7 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
if (ret != -EPROBE_DEFER)
list_del(&driver->pending);
if (ret)
- goto err5;
+ goto err6;
break;
}
}
@@ -1152,6 +1165,9 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,

return 0;

+err6:
+ usb_charger_exit(gadget);
+
err5:
device_del(&udc->dev);

@@ -1263,6 +1279,7 @@ 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 8e81f9e..82a0d63 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>

#define UDC_TRACE_STR_MAX 512

@@ -328,6 +329,7 @@ struct usb_gadget_ops {
* @in_epnum: last used in ep number
* @mA: last set mA value
* @otg_caps: OTG capabilities of this gadget.
+ * @charger: Negotiate the power with the usb charger.
* @sg_supported: true if we can handle scatter-gather
* @is_otg: True if the USB device port uses a Mini-AB jack, so that the
* gadget driver must provide a USB OTG descriptor.
@@ -387,6 +389,7 @@ struct usb_gadget {
unsigned in_epnum;
unsigned mA;
struct usb_otg_caps *otg_caps;
+ struct usb_charger *charger;

unsigned sg_supported:1;
unsigned is_otg:1;
--
1.7.9.5