From: JiebingLi <jiebing.li@xxxxxxxxx>
Get Maximum power consumption function in USB clent driver. This is used by
the power manager.
Signed-off-by: JiebingLi <jiebing.li@xxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---
drivers/usb/gadget/langwell_udc.c | 49 +++++++++++++++++++++++++++++++++++++
include/linux/usb/langwell_udc.h | 6 +++++
2 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/langwell_udc.c b/drivers/usb/gadget/langwell_udc.c
index 3b3e5ba..6251c3c 100644
--- a/drivers/usb/gadget/langwell_udc.c
+++ b/drivers/usb/gadget/langwell_udc.c
@@ -1974,6 +1974,55 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
EXPORT_SYMBOL(usb_gadget_unregister_driver);
+/* gets the maximum power consumption */
+int langwell_udc_maxpower(int *mA)
+{
+ struct langwell_udc *dev = the_controller;
+ u32 usbmode, portsc1, usbcmd;
+
+ /* fatal error */
+ if (!dev) {
+ *mA = 0;
+ return -EINVAL;
+ }
+
+ dev_dbg(&dev->pdev->dev, "---> %s()\n", __func__);
+
+ /* contrller is not in device mode */
+ usbmode = readl(&dev->op_regs->usbmode);
+ if (MODE_CM(usbmode) != MODE_DEVICE) {
+ *mA = 0;
+ return -EINVAL;
+ }
+
+ /* can't get maximum power */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ if (!(usbcmd & CMD_RUNSTOP)) {
+ *mA = 0;
+ return -EINVAL;
+ }
+
+ /* disconnect to USB host */
+ portsc1 = readl(&dev->op_regs->portsc1);
+ if (!(portsc1 & PORTS_CCS)) {
+ *mA = 0;
+ return -EINVAL;
+ }
+
+ /* set max power capability */
+ *mA = CONFIG_USB_GADGET_VBUS_DRAW;
+
+ if ((*mA < 8) || (*mA > 500)) {
+ *mA = 0;
+ return -EINVAL;
+ }
+
+ dev_dbg(&dev->pdev->dev, "<--- %s()\n", __func__);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(langwell_udc_maxpower);
+
+
/*-------------------------------------------------------------------------*/
/*
diff --git a/include/linux/usb/langwell_udc.h b/include/linux/usb/langwell_udc.h
index 2d2d1bb..090d94f 100644
--- a/include/linux/usb/langwell_udc.h
+++ b/include/linux/usb/langwell_udc.h
@@ -306,5 +306,11 @@ struct langwell_op_regs {
#define EPCTRL_RXS BIT(0) /* RX endpoint STALL */
} __attribute__ ((packed));
+
+/* export function declaration */
+
+/* gets the maximum power consumption */
+extern int langwell_udc_maxpower(int *mA);
+
#endif /* __LANGWELL_UDC_H */
--
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