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> Acked-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> --- This patch should be applied after all of the extcon patchset will be applied because this patch has dependency of extcon patch related to DT. http://goo.gl/Tu3qW Changes from v5: * rebased to 3.11-rc1 Changes from v4: * checked the return values of extcon_register_interest and print an error message. Note that I dint do return since there might be cases where one of USB (device mode) or USB-HOST (host mode) might succeed. * Added depends on of EXTCON in usb_dwc3. Only some platforms might be using EXTCON, but inorder to avoid compilation errors, added depends on 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/Kconfig | 1 + drivers/usb/dwc3/dwc3-omap.c | 125 +++++++++++++++++--- 3 files changed, 112 insertions(+), 19 deletions(-) diff --git a/Documentation/devicetree/bindings/usb/omap-usb.txt b/Documentation/devicetree/bindings/usb/omap-usb.txt index 57e71f6..9088ab0 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/Kconfig b/drivers/usb/dwc3/Kconfig index 757aa18..08a9fab 100644 --- a/drivers/usb/dwc3/Kconfig +++ b/drivers/usb/dwc3/Kconfig @@ -1,6 +1,7 @@ config USB_DWC3 tristate "DesignWare USB3 DRD Core Support" depends on (USB || USB_GADGET) && GENERIC_HARDIRQS + depends on EXTCON select USB_XHCI_PLATFORM if USB_SUPPORT && USB_XHCI_HCD help Say Y or M here if your system has a Dual Role SuperSpeed diff --git a/drivers/usb/dwc3/dwc3-omap.c b/drivers/usb/dwc3/dwc3-omap.c index 077f110..b26c2a4 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> @@ -155,9 +157,21 @@ struct dwc3_omap { u32 revision; 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) { @@ -221,18 +235,24 @@ static void dwc3_omap_write_irq0_set(struct dwc3_omap *omap, u32 value) omap->irq0_offset, value); } -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_read_utmi_status(omap); val &= ~(USBOTGSS_UTMI_OTG_STATUS_IDDIG | USBOTGSS_UTMI_OTG_STATUS_VBUSVALID @@ -255,6 +275,9 @@ 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"); @@ -268,12 +291,9 @@ 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) { @@ -366,6 +386,32 @@ 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; @@ -373,6 +419,8 @@ 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; @@ -415,19 +463,22 @@ 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) { @@ -502,14 +553,46 @@ 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; + ret = extcon_register_interest(&omap->extcon_vbus_dev, + edev->name, "USB", &omap->vbus_nb); + if (ret < 0) + dev_vdbg(dev, "failed to register notifier for USB\n"); + omap->id_nb.notifier_call = dwc3_omap_id_notifier; + ret = extcon_register_interest(&omap->extcon_id_dev, edev->name, + "USB-HOST", &omap->id_nb); + if (ret < 0) + dev_vdbg(dev, + "failed to register notifier for USB-HOST\n"); + + 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); @@ -526,6 +609,10 @@ 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); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
