Date:	Tue, 5 Jun 2012 15:08:35 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<gregkh@...uxfoundation.org>, <kishon@...com>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <balbi@...com>
Subject: [PATCH 2/5] usb: musb: twl: use mailbox API to send VBUS or ID events

The atomic notifier from twl4030/twl6030 to notifiy VBUS and ID events,
is replaced by a direct call to omap musb blue.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/usb/musb/omap2430.c   |   90 ++++++++++++++++++++++++++---------------
 drivers/usb/otg/twl4030-usb.c |   42 +++++++++----------
 drivers/usb/otg/twl6030-usb.c |   47 +++++++++------------
 include/linux/usb/musb-omap.h |   30 ++++++++++++++
 4 files changed, 128 insertions(+), 81 deletions(-)
 create mode 100644 include/linux/usb/musb-omap.h

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index f40c805..7139e57 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -34,6 +34,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
 #include <linux/err.h>
+#include <linux/usb/musb-omap.h>
 
 #include "musb_core.h"
 #include "omap2430.h"
@@ -41,11 +42,13 @@
 struct omap2430_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
-	u8			xceiv_event;
+	enum omap_musb_vbus_id_status status;
 	struct work_struct	omap_musb_mailbox_work;
 };
 #define glue_to_musb(g)		platform_get_drvdata(g->musb)
 
+struct omap2430_glue		*_glue;
+
 static struct timer_list musb_idle_timer;
 
 static void musb_do_idle(unsigned long _musb)
@@ -225,50 +228,54 @@ static inline void omap2430_low_level_init(struct musb *musb)
 	musb_writel(musb->mregs, OTG_FORCESTDBY, l);
 }
 
-static int musb_otg_notifications(struct notifier_block *nb,
-		unsigned long event, void *unused)
+void omap_musb_mailbox(enum omap_musb_vbus_id_status status)
 {
-	struct musb		*musb = container_of(nb, struct musb, nb);
-	struct device		*dev = musb->controller;
-	struct omap2430_glue	*glue = dev_get_drvdata(dev->parent);
+	struct omap2430_glue	*glue = _glue;
+	struct musb		*musb = glue_to_musb(glue);
 
-	glue->xceiv_event = event;
-	schedule_work(&glue->omap_musb_mailbox_work);
+	glue->status = status;
+	if (!musb) {
+		dev_err(glue->dev, "musb core is not yet ready\n");
+		return;
+	}
 
-	return NOTIFY_OK;
+	schedule_work(&glue->omap_musb_mailbox_work);
 }
+EXPORT_SYMBOL_GPL(omap_musb_mailbox);
 
-static void omap_musb_mailbox_work(struct work_struct *data_notifier_work)
+static void omap_musb_set_mailbox(struct omap2430_glue *glue)
 {
-	struct omap2430_glue *glue = container_of(data_notifier_work,
-		struct omap2430_glue, omap_musb_mailbox_work);
 	struct musb *musb = glue_to_musb(glue);
 	struct device *dev = musb->controller;
 	struct musb_hdrc_platform_data *pdata = dev->platform_data;
 	struct omap_musb_board_data *data = pdata->board_data;
 
-	switch (glue->xceiv_event) {
-	case USB_EVENT_ID:
-		dev_dbg(musb->controller, "ID GND\n");
+	switch (glue->status) {
+	case OMAP_MUSB_ID_GROUND:
+		dev_dbg(dev, "ID GND\n");
 
+		musb->xceiv->last_event = USB_EVENT_ID;
 		if (!is_otg_enabled(musb) || musb->gadget_driver) {
-			pm_runtime_get_sync(musb->controller);
+			pm_runtime_get_sync(dev);
 			usb_phy_init(musb->xceiv);
 			omap2430_musb_set_vbus(musb, 1);
 		}
 		break;
 
-	case USB_EVENT_VBUS:
-		dev_dbg(musb->controller, "VBUS Connect\n");
+	case OMAP_MUSB_VBUS_VALID:
+		dev_dbg(dev, "VBUS Connect\n");
 
+		musb->xceiv->last_event = USB_EVENT_VBUS;
 		if (musb->gadget_driver)
-			pm_runtime_get_sync(musb->controller);
+			pm_runtime_get_sync(dev);
 		usb_phy_init(musb->xceiv);
 		break;
 
-	case USB_EVENT_NONE:
-		dev_dbg(musb->controller, "VBUS Disconnect\n");
+	case OMAP_MUSB_ID_FLOAT:
+	case OMAP_MUSB_VBUS_OFF:
+		dev_dbg(dev, "VBUS Disconnect\n");
 
+		musb->xceiv->last_event = USB_EVENT_NONE;
 		if (is_otg_enabled(musb) || is_peripheral_enabled(musb))
 			if (musb->gadget_driver) {
 				pm_runtime_mark_last_busy(musb->controller);
@@ -282,15 +289,24 @@ static void omap_musb_mailbox_work(struct work_struct *data_notifier_work)
 		usb_phy_shutdown(musb->xceiv);
 		break;
 	default:
-		dev_dbg(musb->controller, "ID float\n");
+		dev_dbg(dev, "ID float\n");
 	}
 }
 
+
+static void omap_musb_mailbox_work(struct work_struct *mailbox_work)
+{
+	struct omap2430_glue *glue = container_of(mailbox_work,
+				struct omap2430_glue, omap_musb_mailbox_work);
+	omap_musb_set_mailbox(glue);
+}
+
 static int omap2430_musb_init(struct musb *musb)
 {
 	u32 l;
 	int status = 0;
 	struct device *dev = musb->controller;
+	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 	struct musb_hdrc_platform_data *plat = dev->platform_data;
 	struct omap_musb_board_data *data = plat->board_data;
 
@@ -330,14 +346,11 @@ static int omap2430_musb_init(struct musb *musb)
 			musb_readl(musb->mregs, OTG_INTERFSEL),
 			musb_readl(musb->mregs, OTG_SIMENABLE));
 
-	musb->nb.notifier_call = musb_otg_notifications;
-	status = usb_register_notifier(musb->xceiv, &musb->nb);
-
-	if (status)
-		dev_dbg(musb->controller, "notification register failed\n");
-
 	setup_timer(&musb_idle_timer, musb_do_idle, (unsigned long) musb);
 
+	if (glue->status != OMAP_MUSB_UNKNOWN)
+		omap_musb_set_mailbox(glue);
+
 	pm_runtime_put_noidle(musb->controller);
 	return 0;
 
@@ -350,12 +363,13 @@ static void omap2430_musb_enable(struct musb *musb)
 	u8		devctl;
 	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 	struct device *dev = musb->controller;
+	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
 	struct musb_hdrc_platform_data *pdata = dev->platform_data;
 	struct omap_musb_board_data *data = pdata->board_data;
 
-	switch (musb->xceiv->last_event) {
+	switch (glue->status) {
 
-	case USB_EVENT_ID:
+	case OMAP_MUSB_ID_GROUND:
 		usb_phy_init(musb->xceiv);
 		if (data->interface_type != MUSB_INTERFACE_UTMI)
 			break;
@@ -374,7 +388,7 @@ static void omap2430_musb_enable(struct musb *musb)
 		}
 		break;
 
-	case USB_EVENT_VBUS:
+	case OMAP_MUSB_VBUS_VALID:
 		usb_phy_init(musb->xceiv);
 		break;
 
@@ -385,7 +399,10 @@ static void omap2430_musb_enable(struct musb *musb)
 
 static void omap2430_musb_disable(struct musb *musb)
 {
-	if (musb->xceiv->last_event)
+	struct device *dev = musb->controller;
+	struct omap2430_glue *glue = dev_get_drvdata(dev->parent);
+
+	if (glue->status != OMAP_MUSB_UNKNOWN)
 		usb_phy_shutdown(musb->xceiv);
 }
 
@@ -439,11 +456,18 @@ static int __devinit omap2430_probe(struct platform_device *pdev)
 
 	glue->dev			= &pdev->dev;
 	glue->musb			= musb;
+	glue->status			= OMAP_MUSB_UNKNOWN;
 
 	pdata->platform_ops		= &omap2430_ops;
 
 	platform_set_drvdata(pdev, glue);
 
+	/*
+	 * REVISIT if we ever have two instances of the wrapper, we will be
+	 * in big trouble
+	 */
+	_glue	= glue;
+
 	INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work);
 
 	ret = platform_device_add_resources(musb, pdev->resource,
@@ -552,7 +576,7 @@ static int __init omap2430_init(void)
 {
 	return platform_driver_register(&omap2430_driver);
 }
-module_init(omap2430_init);
+subsys_initcall(omap2430_init);
 
 static void __exit omap2430_exit(void)
 {
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index f8139b3..05dc659 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -33,11 +33,11 @@
 #include <linux/io.h>
 #include <linux/delay.h>
 #include <linux/usb/otg.h>
+#include <linux/usb/musb-omap.h>
 #include <linux/usb/ulpi.h>
 #include <linux/i2c/twl.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
-#include <linux/notifier.h>
 #include <linux/slab.h>
 
 /* Register defines */
@@ -159,7 +159,7 @@ struct twl4030_usb {
 	enum twl4030_usb_mode	usb_mode;
 
 	int			irq;
-	u8			linkstat;
+	enum omap_musb_vbus_id_status linkstat;
 	bool			vbus_supplied;
 	u8			asleep;
 	bool			irq_enabled;
@@ -246,10 +246,11 @@ twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
 
 /*-------------------------------------------------------------------------*/
 
-static enum usb_phy_events twl4030_usb_linkstat(struct twl4030_usb *twl)
+static enum omap_musb_vbus_id_status
+	twl4030_usb_linkstat(struct twl4030_usb *twl)
 {
 	int	status;
-	int	linkstat = USB_EVENT_NONE;
+	enum omap_musb_vbus_id_status linkstat = OMAP_MUSB_UNKNOWN;
 	struct usb_otg *otg = twl->phy.otg;
 
 	twl->vbus_supplied = false;
@@ -273,24 +274,22 @@ static enum usb_phy_events twl4030_usb_linkstat(struct twl4030_usb *twl)
                         twl->vbus_supplied = true;
 
 		if (status & BIT(2))
-			linkstat = USB_EVENT_ID;
+			linkstat = OMAP_MUSB_ID_GROUND;
 		else
-			linkstat = USB_EVENT_VBUS;
+			linkstat = OMAP_MUSB_VBUS_VALID;
 	} else
-		linkstat = USB_EVENT_NONE;
+		linkstat = OMAP_MUSB_VBUS_OFF;
 
 	dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
 			status, status, linkstat);
 
-	twl->phy.last_event = linkstat;
-
 	/* REVISIT this assumes host and peripheral controllers
 	 * are registered, and that both are active...
 	 */
 
 	spin_lock_irq(&twl->lock);
 	twl->linkstat = linkstat;
-	if (linkstat == USB_EVENT_ID) {
+	if (linkstat == OMAP_MUSB_ID_GROUND) {
 		otg->default_a = true;
 		twl->phy.state = OTG_STATE_A_IDLE;
 	} else {
@@ -501,10 +500,10 @@ static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
 static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
 {
 	struct twl4030_usb *twl = _twl;
-	int status;
+	enum omap_musb_vbus_id_status status;
 
 	status = twl4030_usb_linkstat(twl);
-	if (status >= 0) {
+	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
@@ -516,13 +515,13 @@ 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_EVENT_NONE)
+		if (status == OMAP_MUSB_VBUS_OFF ||
+				status == OMAP_MUSB_ID_FLOAT)
 			twl4030_phy_suspend(twl, 0);
 		else
 			twl4030_phy_resume(twl);
 
-		atomic_notifier_call_chain(&twl->phy.notifier, status,
-				twl->phy.otg->gadget);
+		omap_musb_mailbox(twl->linkstat);
 	}
 	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 
@@ -531,11 +530,12 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
 
 static void twl4030_usb_phy_init(struct twl4030_usb *twl)
 {
-	int status;
+	enum omap_musb_vbus_id_status status;
 
 	status = twl4030_usb_linkstat(twl);
-	if (status >= 0) {
-		if (status == USB_EVENT_NONE) {
+	if (status > 0) {
+		if (status == OMAP_MUSB_VBUS_OFF ||
+				status == OMAP_MUSB_ID_FLOAT) {
 			__twl4030_phy_power(twl, 0);
 			twl->asleep = 1;
 		} else {
@@ -543,8 +543,7 @@ static void twl4030_usb_phy_init(struct twl4030_usb *twl)
 			twl->asleep = 0;
 		}
 
-		atomic_notifier_call_chain(&twl->phy.notifier, status,
-				twl->phy.otg->gadget);
+		omap_musb_mailbox(twl->linkstat);
 	}
 	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
 }
@@ -613,6 +612,7 @@ static int __devinit twl4030_usb_probe(struct platform_device *pdev)
 	twl->usb_mode		= pdata->usb_mode;
 	twl->vbus_supplied	= false;
 	twl->asleep		= 1;
+	twl->linkstat		= OMAP_MUSB_UNKNOWN;
 
 	twl->phy.dev		= twl->dev;
 	twl->phy.label		= "twl4030";
@@ -639,8 +639,6 @@ 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");
 
-	ATOMIC_INIT_NOTIFIER_HEAD(&twl->phy.notifier);
-
 	/* Our job is to use irqs and status from the power module
 	 * to keep the transceiver disabled when nothing's connected.
 	 *
diff --git a/drivers/usb/otg/twl6030-usb.c b/drivers/usb/otg/twl6030-usb.c
index dbee00a..6c75883 100644
--- a/drivers/usb/otg/twl6030-usb.c
+++ b/drivers/usb/otg/twl6030-usb.c
@@ -26,10 +26,10 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/usb/otg.h>
+#include <linux/usb/musb-omap.h>
 #include <linux/i2c/twl.h>
 #include <linux/regulator/consumer.h>
 #include <linux/err.h>
-#include <linux/notifier.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 
@@ -100,7 +100,7 @@ struct twl6030_usb {
 
 	int			irq1;
 	int			irq2;
-	u8			linkstat;
+	enum omap_musb_vbus_id_status linkstat;
 	u8			asleep;
 	bool			irq_enabled;
 	bool			vbus_enable;
@@ -147,7 +147,7 @@ static int twl6030_phy_init(struct usb_phy *x)
 	dev  = twl->dev;
 	pdata = dev->platform_data;
 
-	if (twl->linkstat == USB_EVENT_ID)
+	if (twl->linkstat == OMAP_MUSB_ID_GROUND)
 		pdata->phy_power(twl->dev, 1, 1);
 	else
 		pdata->phy_power(twl->dev, 0, 1);
@@ -235,13 +235,13 @@ static ssize_t twl6030_usb_vbus_show(struct device *dev,
 	spin_lock_irqsave(&twl->lock, flags);
 
 	switch (twl->linkstat) {
-	case USB_EVENT_VBUS:
+	case OMAP_MUSB_VBUS_VALID:
 	       ret = snprintf(buf, PAGE_SIZE, "vbus\n");
 	       break;
-	case USB_EVENT_ID:
+	case OMAP_MUSB_ID_GROUND:
 	       ret = snprintf(buf, PAGE_SIZE, "id\n");
 	       break;
-	case USB_EVENT_NONE:
+	case OMAP_MUSB_VBUS_OFF:
 	       ret = snprintf(buf, PAGE_SIZE, "none\n");
 	       break;
 	default:
@@ -257,7 +257,7 @@ static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 {
 	struct twl6030_usb *twl = _twl;
 	struct usb_otg *otg = twl->phy.otg;
-	int status;
+	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
 	u8 vbus_state, hw_state;
 
 	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
@@ -268,22 +268,20 @@ static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
 		if (vbus_state & VBUS_DET) {
 			regulator_enable(twl->usb3v3);
 			twl->asleep = 1;
-			status = USB_EVENT_VBUS;
+			status = OMAP_MUSB_VBUS_VALID;
 			otg->default_a = false;
 			twl->phy.state = OTG_STATE_B_IDLE;
 			twl->linkstat = status;
-			twl->phy.last_event = status;
-			atomic_notifier_call_chain(&twl->phy.notifier,
-						status, otg->gadget);
+			omap_musb_mailbox(status);
 		} else {
-			status = USB_EVENT_NONE;
-			twl->linkstat = status;
-			twl->phy.last_event = status;
-			atomic_notifier_call_chain(&twl->phy.notifier,
-						status, otg->gadget);
-			if (twl->asleep) {
-				regulator_disable(twl->usb3v3);
-				twl->asleep = 0;
+			if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
+				status = OMAP_MUSB_VBUS_OFF;
+				twl->linkstat = status;
+				omap_musb_mailbox(status);
+				if (twl->asleep) {
+					regulator_disable(twl->usb3v3);
+					twl->asleep = 0;
+				}
 			}
 		}
 	}
@@ -296,7 +294,7 @@ static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 {
 	struct twl6030_usb *twl = _twl;
 	struct usb_otg *otg = twl->phy.otg;
-	int status = USB_EVENT_NONE;
+	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
 	u8 hw_state;
 
 	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
@@ -308,13 +306,11 @@ static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
 		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
 		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
 								0x10);
-		status = USB_EVENT_ID;
+		status = OMAP_MUSB_ID_GROUND;
 		otg->default_a = true;
 		twl->phy.state = OTG_STATE_A_IDLE;
 		twl->linkstat = status;
-		twl->phy.last_event = status;
-		atomic_notifier_call_chain(&twl->phy.notifier, status,
-							otg->gadget);
+		omap_musb_mailbox(status);
 	} else  {
 		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
 								0x10);
@@ -419,6 +415,7 @@ static int __devinit twl6030_usb_probe(struct platform_device *pdev)
 	twl->irq1		= platform_get_irq(pdev, 0);
 	twl->irq2		= platform_get_irq(pdev, 1);
 	twl->features		= pdata->features;
+	twl->linkstat		= OMAP_MUSB_UNKNOWN;
 
 	twl->phy.dev		= twl->dev;
 	twl->phy.label		= "twl6030";
@@ -449,8 +446,6 @@ static int __devinit twl6030_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");
 
-	ATOMIC_INIT_NOTIFIER_HEAD(&twl->phy.notifier);
-
 	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
 
 	twl->irq_enabled = true;
diff --git a/include/linux/usb/musb-omap.h b/include/linux/usb/musb-omap.h
new file mode 100644
index 0000000..7774c59
--- /dev/null
+++ b/include/linux/usb/musb-omap.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2011-2012 by Texas Instruments
+ *
+ * The Inventra Controller Driver for Linux is free software; you
+ * can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 2 as published by the Free Software
+ * Foundation.
+ */
+
+#ifndef __MUSB_OMAP_H__
+#define __MUSB_OMAP_H__
+
+enum omap_musb_vbus_id_status {
+	OMAP_MUSB_UNKNOWN = 0,
+	OMAP_MUSB_ID_GROUND,
+	OMAP_MUSB_ID_FLOAT,
+	OMAP_MUSB_VBUS_VALID,
+	OMAP_MUSB_VBUS_OFF,
+};
+
+#if (defined(CONFIG_USB_MUSB_OMAP2PLUS) || \
+				defined(CONFIG_USB_MUSB_OMAP2PLUS_MODULE))
+void omap_musb_mailbox(enum omap_musb_vbus_id_status status);
+#else
+static inline void omap_musb_mailbox(enum omap_musb_vbus_id_status status)
+{
+}
+#endif
+
+#endif	/* __MUSB_OMAP_H__ */
-- 
1.7.5.4

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