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Subject[PATCH v2] usb: chipidea: Use extcon framework for VBUS and ID detect
Date
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@linaro.org>
---

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.
+
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;
+}
+
+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


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