Hi Ivan, On 04/15/2015 03:35 PM, Ivan T. Ivanov wrote: > On recent Qualcomm platforms VBUS and ID lines are not routed to > USB PHY LINK controller. Use extcon framework to receive connect > and disconnect ID and VBUS notification. > > Signed-off-by: Ivan T. Ivanov <ivan.ivanov@xxxxxxxxxx> > --- > > Changes since v0 [1], as per Peter Chen suggestions: > > * Moved external connector parsing code to ci_get_platdata() > * Moved external connector related variables to struct ci_hdrc_platform_data > * Rename ci_host_notifier() to ci_id_notifier() > * Fixed device bindings description > * Use select EXTCON framework, instead of depends on. > > [1] https://lkml.org/lkml/2015/4/9/116 > > .../devicetree/bindings/usb/ci-hdrc-qcom.txt | 9 +++ > drivers/usb/chipidea/Kconfig | 1 + > drivers/usb/chipidea/core.c | 87 ++++++++++++++++++++++ > drivers/usb/chipidea/otg.c | 26 ++++++- > include/linux/usb/chipidea.h | 17 +++++ > 5 files changed, 139 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt > index f2899b5..c635aca 100644 > --- a/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt > +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt > @@ -7,6 +7,14 @@ Required properties: > - usb-phy: phandle for the PHY device > - dr_mode: Should be "peripheral" > > +Optional properties: > +- extcon: phandles to external connector devices. First phandle > + should point to external connector, which provide "USB" > + cable events, the second should point to external connector > + device, which provide "USB-HOST" cable events. If one of > + the external connector devices is not required, empty <0> > + phandle should be specified. Do you expect to have "USB" and "USB-HOST" notifiers supplied by two different extcon drivers? It looks strange. I don't think so that we ever will need to deal with such weird configuration. > + > Examples: > gadget@f9a55000 { > compatible = "qcom,ci-hdrc"; > @@ -14,4 +22,5 @@ Examples: > dr_mode = "peripheral"; > interrupts = <0 134 0>; > usb-phy = <&usbphy0>; > + extcon = <0>, <&usb_id>; > }; > diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig > index 5ce3f1d..5619b8c 100644 > --- a/drivers/usb/chipidea/Kconfig > +++ b/drivers/usb/chipidea/Kconfig > @@ -1,6 +1,7 @@ > config USB_CHIPIDEA > tristate "ChipIdea Highspeed Dual Role Controller" > depends on ((USB_EHCI_HCD && USB_GADGET) || (USB_EHCI_HCD && !USB_GADGET) || (!USB_EHCI_HCD && USB_GADGET)) && HAS_DMA > + select EXTCON > help > Say Y here if your system has a dual role high speed USB > controller based on ChipIdea silicon IP. Currently, only the > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c > index 74fea4f..e1d495d 100644 > --- a/drivers/usb/chipidea/core.c > +++ b/drivers/usb/chipidea/core.c > @@ -47,6 +47,7 @@ > #include <linux/delay.h> > #include <linux/device.h> > #include <linux/dma-mapping.h> > +#include <linux/extcon.h> > #include <linux/phy/phy.h> > #include <linux/platform_device.h> > #include <linux/module.h> > @@ -557,9 +558,39 @@ static irqreturn_t ci_irq(int irq, void *data) > return ret; > } > > +static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event, > + void *ptr) > +{ > + struct ci_hdrc_cable *vbus = container_of(nb, struct ci_hdrc_cable, nb); > + > + if (event) > + vbus->state = true; > + else > + vbus->state = false; > + > + return NOTIFY_DONE; > +} Actually it's not true that "USB" cable state is equal to VBUS state. "USB" and "USB-HOST" are mutually exclusive, and when you have ID=0, which means "USB-HOST" is connected, "USB cable will be seen as disconnected even when VBUS=1. We are currently discussing how to pass VBUS state to USB OTG drivers. You can find discussion here: http://www.spinics.net/lists/linux-usb/msg123895.html Best regards, Robert Baldyga > + > +static int ci_id_notifier(struct notifier_block *nb, unsigned long event, > + void *ptr) > +{ > + struct ci_hdrc_cable *id = container_of(nb, struct ci_hdrc_cable, nb); > + > + if (event) > + id->state = false; > + else > + id->state = true; > + > + return NOTIFY_DONE; > +} > + > static int ci_get_platdata(struct device *dev, > struct ci_hdrc_platform_data *platdata) > { > + struct extcon_dev *ext_vbus, *ext_id; > + struct ci_hdrc_cable *cable; > + int ret; > + > if (!platdata->phy_mode) > platdata->phy_mode = of_usb_get_phy_mode(dev->of_node); > > @@ -591,6 +622,53 @@ static int ci_get_platdata(struct device *dev, > if (of_usb_get_maximum_speed(dev->of_node) == USB_SPEED_FULL) > platdata->flags |= CI_HDRC_FORCE_FULLSPEED; > > + ext_id = ERR_PTR(-ENODEV); > + ext_vbus = ERR_PTR(-ENODEV); > + if (of_property_read_bool(dev->of_node, "extcon")) { > + /* Each one of them is not mandatory */ > + ext_vbus = extcon_get_edev_by_phandle(dev, 0); > + if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV) > + return PTR_ERR(ext_vbus); > + > + ext_id = extcon_get_edev_by_phandle(dev, 1); > + if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV) > + return PTR_ERR(ext_id); > + } > + > + if (!IS_ERR(ext_vbus)) { > + cable = &platdata->vbus_extcon; > + cable->nb.notifier_call = ci_vbus_notifier; > + ret = extcon_register_interest(&cable->conn, ext_vbus->name, > + "USB", &cable->nb); > + if (ret < 0) { > + dev_err(dev, "register VBUS failed\n"); > + return ret; > + } > + > + ret = extcon_get_cable_state(ext_vbus, "USB"); > + if (ret) > + cable->state = true; > + else > + cable->state = false; > + } > + > + if (!IS_ERR(ext_id)) { > + cable = &platdata->id_extcon; > + cable->nb.notifier_call = ci_id_notifier; > + ret = extcon_register_interest(&cable->conn, ext_id->name, > + "USB-HOST", &cable->nb); > + if (ret < 0) { > + dev_err(dev, "register ID failed\n"); > + return ret; > + } > + > + ret = extcon_get_cable_state(ext_id, "USB-HOST"); > + if (ret) > + cable->state = false; > + else > + cable->state = true; > + } > + > return 0; > } > > @@ -845,6 +923,7 @@ deinit_phy: > static int ci_hdrc_remove(struct platform_device *pdev) > { > struct ci_hdrc *ci = platform_get_drvdata(pdev); > + struct extcon_specific_cable_nb *cable_nb; > > if (ci->supports_runtime_pm) { > pm_runtime_get_sync(&pdev->dev); > @@ -852,6 +931,14 @@ static int ci_hdrc_remove(struct platform_device *pdev) > pm_runtime_put_noidle(&pdev->dev); > } > > + cable_nb = &ci->platdata->id_extcon.conn; > + if (cable_nb->edev) > + extcon_unregister_interest(cable_nb); > + > + cable_nb = &ci->platdata->vbus_extcon.conn; > + if (cable_nb->edev) > + extcon_unregister_interest(cable_nb); > + > dbg_remove_files(ci); > ci_role_destroy(ci); > ci_hdrc_enter_lpm(ci, true); > diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c > index ad6c87a..34dd196 100644 > --- a/drivers/usb/chipidea/otg.c > +++ b/drivers/usb/chipidea/otg.c > @@ -30,7 +30,31 @@ > */ > u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask) > { > - return hw_read(ci, OP_OTGSC, mask); > + struct ci_hdrc_cable *cable; > + u32 val = hw_read(ci, OP_OTGSC, mask); > + > + /* > + * If using extcon framework for VBUS and/or ID signal > + * detection overwrite OTGSC resiter value > + */ > + cable = &ci->platdata->vbus_extcon; > + if ((mask & OTGSC_BSV) && cable->conn.edev) { > + if (cable->state) > + val |= OTGSC_BSV; > + else > + val &= ~OTGSC_BSV; > + } > + > + cable = &ci->platdata->id_extcon; > + if ((mask & OTGSC_ID) && cable->conn.edev) { > + if (cable->state) > + val |= OTGSC_ID; > + else > + val &= ~OTGSC_ID; > + } > + > + val &= mask; > + return val; > } > > /** > diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h > index ab94f78..0eedaf6 100644 > --- a/include/linux/usb/chipidea.h > +++ b/include/linux/usb/chipidea.h > @@ -5,8 +5,21 @@ > #ifndef __LINUX_USB_CHIPIDEA_H > #define __LINUX_USB_CHIPIDEA_H > > +#include <linux/extcon.h> > #include <linux/usb/otg.h> > > +/** > + * struct ci_hdrc_cable - structure for external connector cable state tracking > + * @state: current state of the line > + * @nb: hold event notification callback > + * @conn: used for notification registration > + */ > +struct ci_hdrc_cable { > + bool state; > + struct notifier_block nb; > + struct extcon_specific_cable_nb conn; > +}; > + > struct ci_hdrc; > struct ci_hdrc_platform_data { > const char *name; > @@ -35,6 +48,10 @@ struct ci_hdrc_platform_data { > void (*notify_event) (struct ci_hdrc *ci, unsigned event); > struct regulator *reg_vbus; > bool tpl_support; > + > + /* VBUS and ID signal state tracking, using extcon framework */ > + struct ci_hdrc_cable vbus_extcon; > + struct ci_hdrc_cable id_extcon; > }; > > /* Default offset of capability registers */ > -- > 1.9.1 -- 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
