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>
---
Suggestions for better solution are welcome!
.../devicetree/bindings/usb/ci-hdrc-qcom.txt | 9 +++
drivers/usb/chipidea/Kconfig | 1 +
drivers/usb/chipidea/ci.h | 18 +++++
drivers/usb/chipidea/core.c | 77 ++++++++++++++++++++++
drivers/usb/chipidea/otg.c | 19 +++++-
5 files changed, 123 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..788da49 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 = <&usb_vbus>, <&usb_id>;
};
diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index 77b47d8..a67b67f 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
+ depends on 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/ci.h b/drivers/usb/chipidea/ci.h
index 65913d4..04e7aee 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -13,6 +13,7 @@
#ifndef __DRIVERS_USB_CHIPIDEA_CI_H
#define __DRIVERS_USB_CHIPIDEA_CI_H
+#include <linux/extcon.h>
#include <linux/list.h>
#include <linux/irqreturn.h>
#include <linux/usb.h>
@@ -132,6 +133,18 @@ struct hw_bank {
};
/**
+ * struct ci_hdrc - structure for exteternal connector cable state tracking
+ * @state: current state of the line
+ * @nb: hold event notification callback
+ * @conn: used for notification registration
+ */
+struct ci_cable {
+ bool state;
+ struct notifier_block nb;
+ struct extcon_specific_cable_nb conn;
+};
+
+/**
* struct ci_hdrc - chipidea device representation
* @dev: pointer to parent device
* @lock: access synchronization
@@ -169,6 +182,8 @@ struct hw_bank {
* @b_sess_valid_event: indicates there is a vbus event, and handled
* at ci_otg_work
* @imx28_write_fix: Freescale imx28 needs swp instruction for writing
+ * @vbus: VBUS signal state trakining, using extcon framework
+ * @id: ID signal state trakining, using extcon framework
*/
struct ci_hdrc {
struct device *dev;
@@ -211,6 +226,9 @@ struct ci_hdrc {
bool id_event;
bool b_sess_valid_event;
bool imx28_write_fix;
+
+ struct ci_cable vbus;
+ struct ci_cable id;
};
static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index a57dc88..0f805bd 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>
@@ -646,9 +647,36 @@ static void ci_get_otg_capable(struct ci_hdrc *ci)
dev_dbg(ci->dev, "It is OTG capable controller\n");
}
+static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct ci_cable *vbus = container_of(nb, struct ci_cable, nb);
+
+ if (event)
+ vbus->state = true;
+ else
+ vbus->state = false;
+
+ return NOTIFY_DONE;
+}
+
+static int ci_host_notifier(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct ci_cable *id = container_of(nb, struct ci_cable, nb);
+
+ if (event)
+ id->state = false;
+ else
+ id->state = true;
+
+ return NOTIFY_DONE;
+}
+
static int ci_hdrc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct extcon_dev *ext_vbus, *ext_id;
struct ci_hdrc *ci;
struct resource *res;
void __iomem *base;
@@ -702,6 +730,51 @@ static int ci_hdrc_probe(struct platform_device *pdev)
ci->usb_phy = NULL;
}
+ ext_id = ERR_PTR(-ENODEV);
+ ext_vbus = ERR_PTR(-ENODEV);
+ if (of_property_read_bool(dev->parent->of_node, "extcon")) {
+ /* Each one of them is not mandatory */
+ ext_vbus = extcon_get_edev_by_phandle(dev->parent, 0);
+ if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
+ return PTR_ERR(ext_vbus);
+
+ ext_id = extcon_get_edev_by_phandle(dev->parent, 1);
+ if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
+ return PTR_ERR(ext_id);
+ }
+
+ if (!IS_ERR(ext_vbus)) {
+ ci->vbus.nb.notifier_call = ci_vbus_notifier;
+ ret = extcon_register_interest(&ci->vbus.conn, ext_vbus->name,
+ "USB", &ci->vbus.nb);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "register VBUS failed\n");
+ return ret;
+ }
+
+ ret = extcon_get_cable_state(ext_vbus, "USB");
+ if (ret)
+ ci->vbus.state = true;
+ else
+ ci->vbus.state = false;
+ }
+
+ if (!IS_ERR(ext_id)) {
+ ci->id.nb.notifier_call = ci_host_notifier;
+ ret = extcon_register_interest(&ci->id.conn, ext_id->name,
+ "USB-HOST", &ci->id.nb);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "register ID failed\n");
+ return ret;
+ }
+
+ ret = extcon_get_cable_state(ext_id, "USB-HOST");
+ if (ret)
+ ci->id.state = false;
+ else
+ ci->id.state = true;
+ }
+
ret = ci_usb_phy_init(ci);
if (ret) {
dev_err(dev, "unable to init phy: %d\n", ret);
@@ -807,6 +880,10 @@ static int ci_hdrc_remove(struct platform_device *pdev)
{
struct ci_hdrc *ci = platform_get_drvdata(pdev);
+ if (ci->id.conn.edev)
+ extcon_unregister_interest(&ci->id.conn);
+ if (ci->vbus.conn.edev)
+ extcon_unregister_interest(&ci->vbus.conn);
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 a048b08..2e97c0d 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -30,7 +30,24 @@
*/
u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
{
- return hw_read(ci, OP_OTGSC, mask);
+ u32 val = hw_read(ci, OP_OTGSC, mask);
+
+ if ((mask & OTGSC_BSV) && ci->vbus.conn.edev) {
+ if (ci->vbus.state)
+ val |= OTGSC_BSV;
+ else
+ val &= ~OTGSC_BSV;
+ }
+
+ if ((mask & OTGSC_ID) && ci->id.conn.edev) {
+ if (ci->id.state)
+ val |= OTGSC_ID;
+ else
+ val &= ~OTGSC_ID;
+ }
+
+ val &= mask;
+ return val;
}
/**
--
1.9.1
--
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