linux-kernel - [PATCH 09/14] twl4030_charger: only draw USB current as negotiated with host.

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Date:	Mon, 23 Mar 2015 10:20:29 +1100
From:	NeilBrown <neil@...wn.name>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	NeilBrown <neilb@...e.de>, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	GTA04 owners <gta04-owner@...delico.com>,
	inux-pm@...r.kernel.org, Pavel Machek <pavel@....cz>,
	linux-omap@...r.kernel.org, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 09/14] twl4030_charger: only draw USB current as negotiated
 with host.

From: NeilBrown <neilb@...e.de>

If the phy has been told what current it can draw, it tells us
and now we use that number.

Note that 'vbus_draw' is in mA, while usb_cur is in uA.

Acked-by: Pavel Machek <pavel@....cz>
Signed-off-by: NeilBrown <neilb@...e.de>
---
 drivers/power/twl4030_charger.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index df031b0123d0..2042e7619954 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -602,6 +602,7 @@ static void twl4030_bci_usb_work(struct work_struct *data)
 	switch (bci->event) {
 	case USB_EVENT_VBUS:
 	case USB_EVENT_CHARGER:
+	case USB_EVENT_ENUMERATED:
 		twl4030_charger_enable_usb(bci, true);
 		break;
 	case USB_EVENT_NONE:
@@ -614,6 +615,7 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 			       void *priv)
 {
 	struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
+	unsigned int *vbus_draw = priv;
 
 	dev_dbg(bci->dev, "OTG notify %lu\n", val);
 
@@ -624,6 +626,9 @@ static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
 		bci->usb_cur = 100000;
 
 	bci->event = val;
+	if (val == USB_EVENT_ENUMERATED && vbus_draw &&
+	    *vbus_draw * 1000 > bci->usb_cur)
+		bci->usb_cur = *vbus_draw * 1000;
 	schedule_work(&bci->work);
 
 	return NOTIFY_OK;


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