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Date: Tue, 8 Sep 2015 17:39:07 +0800
From: Peter Chen <peter.chen@...escale.com>
To: "Ivan T. Ivanov" <ivan.ivanov@...aro.org>
CC: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
"Mark Rutland" <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Antoine Tenart <antoine.tenart@...e-electrons.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-usb@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v4] usb: chipidea: Use extcon framework for VBUS and ID
detect
On Mon, Sep 07, 2015 at 02:45:25PM +0300, 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@...aro.org>
I will queue it for next rc1, thanks.
Peter
> ---
>
> Changes sice v3 [1]:
>
> * Migrate to new extcon framework API
> * Address comments from Peter Chen.
>
> Tested DRD role with "qcom,ci-hdrc" and "qcom,usb-8x16-phy" on DB410c
>
> [1] https://lkml.org/lkml/2015/6/2/333
>
> .../devicetree/bindings/usb/ci-hdrc-usb2.txt | 6 +
> drivers/usb/chipidea/Kconfig | 1 +
> drivers/usb/chipidea/core.c | 125 +++++++++++++++++++++
> drivers/usb/chipidea/otg.c | 39 ++++++-
> include/linux/usb/chipidea.h | 23 ++++
> 5 files changed, 193 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> index d71ef07bca5d..aea7d0af5fd6 100644
> --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
> @@ -45,6 +45,11 @@ Optional properties:
> (4 bytes), This register represents the maximum length of a the burst
> in 32-bit words while moving data from the USB bus to system memory,
> changing this value takes effect only the SBUSCFG.AHBBRST is 0.
> +- 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.
>
> Example:
>
> @@ -61,4 +66,5 @@ Example:
> ahb-burst-config = <0x0>;
> tx-burst-size-dword = <0x10>; /* 64 bytes */
> rx-burst-size-dword = <0x10>;
> + extcon = <0>, <&usb_id>;
> };
> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> index 5ce3f1d6a6ed..5619b8ca3bf3 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 3feebf7f31f0..573c2876b263 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>
> @@ -602,9 +603,45 @@ 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);
> + struct ci_hdrc *ci = vbus->ci;
> +
> + if (event)
> + vbus->state = true;
> + else
> + vbus->state = false;
> +
> + vbus->changed = true;
> +
> + ci_irq(ci->irq, ci);
> + return NOTIFY_DONE;
> +}
> +
> +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);
> + struct ci_hdrc *ci = id->ci;
> +
> + if (event)
> + id->state = false;
> + else
> + id->state = true;
> +
> + id->changed = true;
> +
> + ci_irq(ci->irq, ci);
> + 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)
> @@ -695,9 +732,91 @@ static int ci_get_platdata(struct device *dev,
> platdata->flags |= CI_HDRC_OVERRIDE_RX_BURST;
> }
>
> + 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);
> + }
> +
> + cable = &platdata->vbus_extcon;
> + cable->nb.notifier_call = ci_vbus_notifier;
> + cable->edev = ext_vbus;
> +
> + if (!IS_ERR(ext_vbus)) {
> + ret = extcon_get_cable_state_(cable->edev, EXTCON_USB);
> + if (ret)
> + cable->state = true;
> + else
> + cable->state = false;
> + }
> +
> + cable = &platdata->id_extcon;
> + cable->nb.notifier_call = ci_id_notifier;
> + cable->edev = ext_id;
> +
> + if (!IS_ERR(ext_id)) {
> + ret = extcon_get_cable_state_(cable->edev, EXTCON_USB_HOST);
> + if (ret)
> + cable->state = false;
> + else
> + cable->state = true;
> + }
> return 0;
> }
>
> +static int ci_extcon_register(struct ci_hdrc *ci)
> +{
> + struct ci_hdrc_cable *id, *vbus;
> + int ret;
> +
> + id = &ci->platdata->id_extcon;
> + id->ci = ci;
> + if (!IS_ERR(id->edev)) {
> + ret = extcon_register_notifier(id->edev, EXTCON_USB_HOST,
> + &id->nb);
> + if (ret < 0) {
> + dev_err(ci->dev, "register ID failed\n");
> + return ret;
> + }
> + }
> +
> + vbus = &ci->platdata->vbus_extcon;
> + vbus->ci = ci;
> + if (!IS_ERR(vbus->edev)) {
> + ret = extcon_register_notifier(vbus->edev, EXTCON_USB,
> + &vbus->nb);
> + if (ret < 0) {
> + extcon_unregister_notifier(id->edev, EXTCON_USB_HOST,
> + &id->nb);
> + dev_err(ci->dev, "register VBUS failed\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void ci_extcon_unregister(struct ci_hdrc *ci)
> +{
> + struct ci_hdrc_cable *cable;
> +
> + cable = &ci->platdata->id_extcon;
> + if (!IS_ERR(cable->edev))
> + extcon_unregister_notifier(cable->edev, EXTCON_USB_HOST,
> + &cable->nb);
> +
> + cable = &ci->platdata->vbus_extcon;
> + if (!IS_ERR(cable->edev))
> + extcon_unregister_notifier(cable->edev, EXTCON_USB, &cable->nb);
> +}
> +
> static DEFINE_IDA(ci_ida);
>
> struct platform_device *ci_hdrc_add_device(struct device *dev,
> @@ -921,6 +1040,10 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> if (ret)
> goto stop;
>
> + ret = ci_extcon_register(ci);
> + if (ret)
> + goto stop;
> +
> if (ci->supports_runtime_pm) {
> pm_runtime_set_active(&pdev->dev);
> pm_runtime_enable(&pdev->dev);
> @@ -938,6 +1061,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> if (!ret)
> return 0;
>
> + ci_extcon_unregister(ci);
> stop:
> ci_role_destroy(ci);
> deinit_phy:
> @@ -957,6 +1081,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
> }
>
> dbg_remove_files(ci);
> + ci_extcon_unregister(ci);
> ci_role_destroy(ci);
> ci_hdrc_enter_lpm(ci, true);
> ci_usb_phy_exit(ci);
> diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> index ad6c87a4653c..ab4bd0c2d4ef 100644
> --- a/drivers/usb/chipidea/otg.c
> +++ b/drivers/usb/chipidea/otg.c
> @@ -30,7 +30,44 @@
> */
> 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 register value
> + */
> + cable = &ci->platdata->vbus_extcon;
> + if (!IS_ERR(cable->edev)) {
> + if (cable->changed)
> + val |= OTGSC_BSVIS;
> + else
> + val &= ~OTGSC_BSVIS;
> +
> + cable->changed = false;
> +
> + if (cable->state)
> + val |= OTGSC_BSV;
> + else
> + val &= ~OTGSC_BSV;
> + }
> +
> + cable = &ci->platdata->id_extcon;
> + if (!IS_ERR(cable->edev)) {
> + if (cable->changed)
> + val |= OTGSC_IDIS;
> + else
> + val &= ~OTGSC_IDIS;
> +
> + cable->changed = false;
> +
> + if (cable->state)
> + val |= OTGSC_ID;
> + else
> + val &= ~OTGSC_ID;
> + }
> +
> + return val;
> }
>
> /**
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index a41833cd184c..c5cddc6901d0 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -5,9 +5,28 @@
> #ifndef __LINUX_USB_CHIPIDEA_H
> #define __LINUX_USB_CHIPIDEA_H
>
> +#include <linux/extcon.h>
> #include <linux/usb/otg.h>
>
> struct ci_hdrc;
> +
> +/**
> + * struct ci_hdrc_cable - structure for external connector cable state tracking
> + * @state: current state of the line
> + * @changed: set to true when extcon event happen
> + * @edev: device which generate events
> + * @ci: driver state of the chipidea device
> + * @nb: hold event notification callback
> + * @conn: used for notification registration
> + */
> +struct ci_hdrc_cable {
> + bool state;
> + bool changed;
> + struct extcon_dev *edev;
> + struct ci_hdrc *ci;
> + struct notifier_block nb;
> +};
> +
> struct ci_hdrc_platform_data {
> const char *name;
> /* offset of the capability registers */
> @@ -48,6 +67,10 @@ struct ci_hdrc_platform_data {
> u32 ahb_burst_config;
> u32 tx_burst_size;
> u32 rx_burst_size;
> +
> + /* 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
>
--
Best Regards,
Peter Chen
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