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Commit d1b5b5c0 authored by Felipe Balbi's avatar Felipe Balbi Committed by Greg Kroah-Hartman
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USB: otg: twl4030: add support for notifier 



it's expected that the transceiver driver will
initialize and call the notifier chain when
necessary. Implement that for twl4030-usb driver.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent e9a20171

drivers/usb/otg/twl4030-usb.c

+14 −21
Original line number Diff line number Diff line
@@ -36,7 +36,7 @@ 
#include <linux/i2c/twl.h>

#include <linux/regulator/consumer.h>

#include <linux/err.h>



#include <linux/notifier.h>



/* Register defines */
@@ -236,15 +236,6 @@ 
#define PMBR1				0x0D

#define GPIO_USB_4PIN_ULPI_2430C	(3 << 0)







enum linkstat {

	USB_LINK_UNKNOWN = 0,

	USB_LINK_NONE,

	USB_LINK_VBUS,

	USB_LINK_ID,

};



struct twl4030_usb {

	struct otg_transceiver	otg;

	struct device		*dev;
@@ -347,10 +338,10 @@ twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits) 


/*-------------------------------------------------------------------------*/



static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)

static enum usb_xceiv_events twl4030_usb_linkstat(struct twl4030_usb *twl)

{

	int	status;

	int	linkstat = USB_LINK_UNKNOWN;

	int	linkstat = USB_EVENT_NONE;



	/*

	 * For ID/VBUS sensing, see manual section 15.4.8 ...
@@ -368,11 +359,11 @@ static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl) 
		dev_err(twl->dev, "USB link status err %d\n", status);

	else if (status & (BIT(7) | BIT(2))) {

		if (status & BIT(2))

			linkstat = USB_LINK_ID;

			linkstat = USB_EVENT_ID;

		else

			linkstat = USB_LINK_VBUS;

			linkstat = USB_EVENT_VBUS;

	} else

		linkstat = USB_LINK_NONE;

		linkstat = USB_EVENT_NONE;



	dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",

			status, status, linkstat);
@@ -383,7 +374,7 @@ static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl) 


	spin_lock_irq(&twl->lock);

	twl->linkstat = linkstat;

	if (linkstat == USB_LINK_ID) {

	if (linkstat == USB_EVENT_ID) {

		twl->otg.default_a = true;

		twl->otg.state = OTG_STATE_A_IDLE;

	} else {
@@ -564,7 +555,7 @@ static ssize_t twl4030_usb_vbus_show(struct device *dev, 


	spin_lock_irqsave(&twl->lock, flags);

	ret = sprintf(buf, "%s\n",

			(twl->linkstat == USB_LINK_VBUS) ? "on" : "off");

			(twl->linkstat == USB_EVENT_VBUS) ? "on" : "off");

	spin_unlock_irqrestore(&twl->lock, flags);



	return ret;
@@ -585,8 +576,7 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl) 
#endif



	status = twl4030_usb_linkstat(twl);

	if (status != USB_LINK_UNKNOWN) {



	if (status >= 0) {

		/* FIXME add a set_power() method so that B-devices can

		 * configure the charger appropriately.  It's not always

		 * correct to consume VBUS power, and how much current to
@@ -598,12 +588,13 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl) 
		 * USB_LINK_VBUS state.  musb_hdrc won't care until it

		 * starts to handle softconnect right.

		 */

		if (status == USB_LINK_NONE)

		if (status == USB_EVENT_NONE)

			twl4030_phy_suspend(twl, 0);

		else

			twl4030_phy_resume(twl);



		twl4030charger_usb_en(status == USB_LINK_VBUS);

		blocking_notifier_call_chain(&twl->otg.notifier, status,

				twl->otg.gadget);

	}

	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
@@ -693,6 +684,8 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev) 
	if (device_create_file(&pdev->dev, &dev_attr_vbus))

		dev_warn(&pdev->dev, "could not create sysfs file\n");



	BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier);



	/* Our job is to use irqs and status from the power module

	 * to keep the transceiver disabled when nothing's connected.

	 *