Re: [PATCH v4] usb: dwc3: use extcon fwrk to receive connect/disconnect

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi,

On Monday 17 June 2013 09:39 AM, Chanwoo Choi wrote:
On 06/14/2013 10:10 PM, Kishon Vijay Abraham I wrote:
Modified dwc3-omap to receive connect and disconnect notification using
extcon framework. Also did the necessary cleanups required after
adapting to extcon framework.

Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
Acked-by: Felipe Balbi <balbi@xxxxxx>
---
This patch depends on
git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git commit:f7ae906

It should also be applied on top of
usb: dwc3: omap: improve error handling of dwc3_omap_probe patch which is
merged in Felipe's tree.

So I'm not sure on whose tree this patch should go in.

Changes from v3:
* did #include of of_extcon.h after Chanwoo resent the patch separating
extcon-class.c from of_extcon.c
Changes from v2:
* updated the Documentation with dwc3 dt binding information.
* used of_extcon_get_extcon_dev to get extcon device from device tree data.
Changes from v1:
* regulator enable/disable is now done here instead of palmas-usb as some users
of palmas-usb wont need regulator.

  Documentation/devicetree/bindings/usb/omap-usb.txt |    5 +
  drivers/usb/dwc3/dwc3-omap.c                       |  119 ++++++++++++++++----
  include/linux/usb/dwc3-omap.h                      |   30 -----
  3 files changed, 105 insertions(+), 49 deletions(-)
  delete mode 100644 include/linux/usb/dwc3-omap.h

diff --git a/Documentation/devicetree/bindings/usb/omap-usb.txt b/Documentation/devicetree/bindings/usb/omap-usb.txt
index d4769f3..f1c15f3 100644
--- a/Documentation/devicetree/bindings/usb/omap-usb.txt
+++ b/Documentation/devicetree/bindings/usb/omap-usb.txt
@@ -53,6 +53,11 @@ OMAP DWC3 GLUE
     It should be set to "1" for HW mode and "2" for SW mode.
   - ranges: the child address space are mapped 1:1 onto the parent address space

+Optional Properties:
+ - extcon : phandle for the extcon device omap dwc3 uses to detect
+   connect/disconnect events.
+ - vbus-supply : phandle to the regulator device tree node if needed.
+
  Sub-nodes:
  The dwc3 core should be added as subnode to omap dwc3 glue.
  - dwc3 :
diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c
index f8f76e6..14c1f1b 100644
--- a/drivers/usb/dwc3/dwc3-omap.c
+++ b/drivers/usb/dwc3/dwc3-omap.c
@@ -43,13 +43,15 @@
  #include <linux/spinlock.h>
  #include <linux/platform_device.h>
  #include <linux/platform_data/dwc3-omap.h>
-#include <linux/usb/dwc3-omap.h>
  #include <linux/pm_runtime.h>
  #include <linux/dma-mapping.h>
  #include <linux/ioport.h>
  #include <linux/io.h>
  #include <linux/of.h>
  #include <linux/of_platform.h>
+#include <linux/extcon.h>
+#include <linux/extcon/of_extcon.h>
+#include <linux/regulator/consumer.h>

  #include <linux/usb/otg.h>

@@ -124,9 +126,21 @@ struct dwc3_omap {
  	u32			utmi_otg_status;

  	u32			dma_status:1;
+
+	struct extcon_specific_cable_nb extcon_vbus_dev;
+	struct extcon_specific_cable_nb extcon_id_dev;
+	struct notifier_block	vbus_nb;
+	struct notifier_block	id_nb;
+
+	struct regulator	*vbus_reg;
  };

-static struct dwc3_omap		*_omap;
+enum omap_dwc3_vbus_id_status {
+	OMAP_DWC3_ID_FLOAT,
+	OMAP_DWC3_ID_GROUND,
+	OMAP_DWC3_VBUS_OFF,
+	OMAP_DWC3_VBUS_VALID,
+};

  static inline u32 dwc3_omap_readl(void __iomem *base, u32 offset)
  {
@@ -138,18 +152,23 @@ static inline void dwc3_omap_writel(void __iomem *base, u32 offset, u32 value)
  	writel(value, base + offset);
  }

-int dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
+static void dwc3_omap_set_mailbox(struct dwc3_omap *omap,
+	enum omap_dwc3_vbus_id_status status)
  {
-	u32			val;
-	struct dwc3_omap	*omap = _omap;
-
-	if (!omap)
-		return -EPROBE_DEFER;
+	int	ret;
+	u32	val;

  	switch (status) {
  	case OMAP_DWC3_ID_GROUND:
  		dev_dbg(omap->dev, "ID GND\n");

+		if (omap->vbus_reg) {
+			ret = regulator_enable(omap->vbus_reg);
+			if (ret) {
+				dev_dbg(omap->dev, "regulator enable failed\n");
+				return;
+			}
+		}
  		val = dwc3_omap_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
  		val &= ~(USBOTGSS_UTMI_OTG_STATUS_IDDIG
  				| USBOTGSS_UTMI_OTG_STATUS_VBUSVALID
@@ -172,6 +191,9 @@ int dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
  		break;

  	case OMAP_DWC3_ID_FLOAT:
+		if (omap->vbus_reg)
+			regulator_disable(omap->vbus_reg);
+
  	case OMAP_DWC3_VBUS_OFF:
  		dev_dbg(omap->dev, "VBUS Disconnect\n");

@@ -185,12 +207,9 @@ int dwc3_omap_mailbox(enum omap_dwc3_vbus_id_status status)
  		break;

  	default:
-		dev_dbg(omap->dev, "ID float\n");
+		dev_dbg(omap->dev, "invalid state\n");
  	}
-
-	return 0;
  }
-EXPORT_SYMBOL_GPL(dwc3_omap_mailbox);

  static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
  {
@@ -282,6 +301,32 @@ static void dwc3_omap_disable_irqs(struct dwc3_omap *omap)

  static u64 dwc3_omap_dma_mask = DMA_BIT_MASK(32);

+static int dwc3_omap_id_notifier(struct notifier_block *nb,
+	unsigned long event, void *ptr)
+{
+	struct dwc3_omap *omap = container_of(nb, struct dwc3_omap, id_nb);
+
+	if (event)
+		dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
+	else
+		dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_FLOAT);
+
+	return NOTIFY_DONE;
+}
+
+static int dwc3_omap_vbus_notifier(struct notifier_block *nb,
+	unsigned long event, void *ptr)
+{
+	struct dwc3_omap *omap = container_of(nb, struct dwc3_omap, vbus_nb);
+
+	if (event)
+		dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
+	else
+		dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_OFF);
+
+	return NOTIFY_DONE;
+}
+
  static int dwc3_omap_probe(struct platform_device *pdev)
  {
  	struct device_node	*node = pdev->dev.of_node;
@@ -289,6 +334,8 @@ static int dwc3_omap_probe(struct platform_device *pdev)
  	struct dwc3_omap	*omap;
  	struct resource		*res;
  	struct device		*dev = &pdev->dev;
+	struct extcon_dev	*edev;
+	struct regulator	*vbus_reg = NULL;

  	int			ret = -ENOMEM;
  	int			irq;
@@ -330,19 +377,22 @@ static int dwc3_omap_probe(struct platform_device *pdev)
  		return -ENOMEM;
  	}

+	if (of_property_read_bool(node, "vbus-supply")) {
+		vbus_reg = devm_regulator_get(dev, "vbus");
+		if (IS_ERR(vbus_reg)) {
+			dev_err(dev, "vbus init failed\n");
+			return PTR_ERR(vbus_reg);
+		}
+	}
+
  	spin_lock_init(&omap->lock);

  	omap->dev	= dev;
  	omap->irq	= irq;
  	omap->base	= base;
+	omap->vbus_reg	= vbus_reg;
  	dev->dma_mask	= &dwc3_omap_dma_mask;

-	/*
-	 * REVISIT if we ever have two instances of the wrapper, we will be
-	 * in big trouble
-	 */
-	_omap	= omap;
-
  	pm_runtime_enable(dev);
  	ret = pm_runtime_get_sync(dev);
  	if (ret < 0) {
@@ -381,14 +431,41 @@ static int dwc3_omap_probe(struct platform_device *pdev)

  	dwc3_omap_enable_irqs(omap);

+	if (of_property_read_bool(node, "extcon")) {
+		edev = of_extcon_get_extcon_dev(dev, 0);
+		if (IS_ERR(edev)) {
+			dev_vdbg(dev, "couldn't get extcon device\n");
+			ret = PTR_ERR(edev);
+			goto err2;
+		}
+
+		omap->vbus_nb.notifier_call = dwc3_omap_vbus_notifier;
+		extcon_register_interest(&omap->extcon_vbus_dev, edev->name,
+					 "USB", &omap->vbus_nb);
+		omap->id_nb.notifier_call = dwc3_omap_id_notifier;
+		extcon_register_interest(&omap->extcon_id_dev, edev->name,
+					 "USB-HOST", &omap->id_nb);

I prefer adding exception handling code about return value of extcon_register_interest().

+
+		if (extcon_get_cable_state(edev, "USB") == true)
+			dwc3_omap_set_mailbox(omap, OMAP_DWC3_VBUS_VALID);
+		if (extcon_get_cable_state(edev, "USB-HOST") == true)
+			dwc3_omap_set_mailbox(omap, OMAP_DWC3_ID_GROUND);
+	}
+
  	ret = of_platform_populate(node, NULL, NULL, dev);
  	if (ret) {
  		dev_err(&pdev->dev, "failed to create dwc3 core\n");
-		goto err2;
+		goto err3;
  	}

  	return 0;

+err3:
+	if (omap->extcon_vbus_dev.edev)
+		extcon_unregister_interest(&omap->extcon_vbus_dev);
+	if (omap->extcon_id_dev.edev)
+		extcon_unregister_interest(&omap->extcon_id_dev);
+
  err2:
  	dwc3_omap_disable_irqs(omap);

@@ -405,6 +482,10 @@ static int dwc3_omap_remove(struct platform_device *pdev)
  {
  	struct dwc3_omap	*omap = platform_get_drvdata(pdev);

+	if (omap->extcon_vbus_dev.edev)
+		extcon_unregister_interest(&omap->extcon_vbus_dev);
+	if (omap->extcon_id_dev.edev)
+		extcon_unregister_interest(&omap->extcon_id_dev);
  	dwc3_omap_disable_irqs(omap);
  	pm_runtime_put_sync(&pdev->dev);
  	pm_runtime_disable(&pdev->dev);
diff --git a/include/linux/usb/dwc3-omap.h b/include/linux/usb/dwc3-omap.h
deleted file mode 100644
index 5615f4d..0000000


It looks good if you add exception handler about return value of extcon_register_interest().

Ok. I'll fix exception handler and also add depend on of EXTCON here.

Thanks
Kishon
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux