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Message-ID: <1426686963-11613-8-git-send-email-rogerq@ti.com>
Date: Wed, 18 Mar 2015 15:56:01 +0200
From: Roger Quadros <rogerq@...com>
To: <gregkh@...uxfoundation.org>, <balbi@...com>,
<stern@...land.harvard.edu>
CC: <dan.j.williams@...el.com>, <peter.chen@...escale.com>,
<jun.li@...escale.com>, <mathias.nyman@...ux.intel.com>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-omap@...r.kernel.org>, Roger Quadros <rogerq@...com>
Subject: [RFC][PATCH 7/9] usb: dwc3: adapt to OTG core
Register with the USB OTG core.
Use extcon framework to get VBUS/ID cable events and
kick the OTG state machine.
TODO:
- OTG driver ops to configure dwc3 otg core during role switches.
Signed-off-by: Roger Quadros <rogerq@...com>
---
drivers/usb/dwc3/core.c | 101 +++++++++++++++++++++++++++++++++++++++
drivers/usb/dwc3/core.h | 6 +++
drivers/usb/dwc3/platform_data.h | 1 +
3 files changed, 108 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 9f0e209..9d8c306 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -39,6 +39,7 @@
#include <linux/usb/gadget.h>
#include <linux/usb/of.h>
#include <linux/usb/otg.h>
+#include <linux/usb/usb-otg.h>
#include "platform_data.h"
#include "core.h"
@@ -656,6 +657,82 @@ static int dwc3_core_get_phy(struct dwc3 *dwc)
return 0;
}
+static void dwc3_sync_cable_state_to_otg(struct dwc3 *dwc)
+{
+ int id, vbus;
+
+ /* get ID */
+ id = extcon_get_cable_state(dwc->edev, "USB-HOST");
+ /* Host means ID == 0 */
+ id = !id;
+
+ /* get VBUS */
+ vbus = extcon_get_cable_state(dwc->edev, "USB");
+ dev_dbg(dwc->dev, "id %d vbus %d\n", id, vbus);
+
+ dwc->fsm->id = id;
+ dwc->fsm->a_vbus_vld = vbus;
+ /* simulate b_sess_vld */
+ dwc->fsm->b_sess_vld = id && vbus;
+ usb_otg_sync_inputs(dwc->fsm);
+}
+
+static int dwc3_otg_notifier(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct dwc3 *dwc = container_of(nb, struct dwc3, otg_nb);
+
+ dwc3_sync_cable_state_to_otg(dwc);
+
+ return NOTIFY_DONE;
+}
+
+static struct otg_fsm_ops dwc3_otg_ops; /* FIXME. need real stuff */
+
+static int dwc3_otg_init(struct dwc3 *dwc)
+{
+ int ret, id, vbus;
+
+ if (!dwc->edev) {
+ dev_err(dwc->dev, "No extcon device found for OTG mode\n");
+ return -ENODEV;
+ }
+
+ dwc->otg_nb.notifier_call = dwc3_otg_notifier;
+ ret = extcon_register_notifier(dwc->edev, &dwc->otg_nb);
+ if (ret < 0) {
+ dev_err(dwc->dev, "Couldn't register USB cable notifier\n");
+ return -ENODEV;
+ }
+
+ /* sanity check id & vbus states */
+ id = extcon_get_cable_state(dwc->edev, "USB-HOST");
+ vbus = extcon_get_cable_state(dwc->edev, "USB");
+ if (id < 0 || vbus < 0) {
+ dev_err(dwc->dev, "Invalid USB cable state. id %d, vbus %d\n",
+ id, vbus);
+ ret = -ENODEV;
+ goto fail;
+ }
+
+ /* register parent as OTG device with USB core */
+ dwc->fsm = usb_otg_register(dwc->dev, &dwc3_otg_ops);
+ if (IS_ERR(dwc->fsm)) {
+ dev_err(dwc->dev, "Failed to register with OTG core\n");
+ ret = -ENODEV;
+ goto fail;
+ }
+
+ dwc3_sync_cable_state_to_otg(dwc);
+
+ return 0;
+
+fail:
+ extcon_unregister_notifier(dwc->edev, &dwc->otg_nb);
+
+ return ret;
+}
+
static int dwc3_core_init_mode(struct dwc3 *dwc)
{
struct device *dev = dwc->dev;
@@ -680,6 +757,12 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
break;
case USB_DR_MODE_OTG:
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
+ ret = dwc3_otg_init(dwc);
+ if (ret) {
+ dev_err(dev, "failed to initialize OTG\n");
+ return ret;
+ }
+
ret = dwc3_host_init(dwc);
if (ret) {
dev_err(dev, "failed to initialize host\n");
@@ -712,6 +795,7 @@ static void dwc3_core_exit_mode(struct dwc3 *dwc)
case USB_DR_MODE_OTG:
dwc3_host_exit(dwc);
dwc3_gadget_exit(dwc);
+ usb_otg_unregister(dwc->dev);
break;
default:
/* do nothing */
@@ -799,6 +883,16 @@ static int dwc3_probe(struct platform_device *pdev)
hird_threshold = 12;
if (node) {
+ if (of_property_read_bool(node, "extcon"))
+ dwc->edev = extcon_get_edev_by_phandle(dev, 0);
+ else if (of_property_read_bool(dev->parent->of_node, "extcon"))
+ dwc->edev = extcon_get_edev_by_phandle(dev->parent, 0);
+
+ if (IS_ERR(dwc->edev)) {
+ dev_vdbg(dev, "couldn't get extcon device\n");
+ return -EPROBE_DEFER;
+ }
+
dwc->maximum_speed = of_usb_get_maximum_speed(node);
dwc->has_lpm_erratum = of_property_read_bool(node,
"snps,has-lpm-erratum");
@@ -839,6 +933,13 @@ static int dwc3_probe(struct platform_device *pdev)
of_property_read_u8(node, "snps,tx_de_emphasis",
&tx_de_emphasis);
} else if (pdata) {
+ if (pdata->extcon) {
+ dwc->edev = extcon_get_extcon_dev(pdata->extcon);
+ if (!dwc->edev) {
+ dev_vdbg(dev, "couldn't get extcon device\n");
+ return -EPROBE_DEFER;
+ }
+ }
dwc->maximum_speed = pdata->maximum_speed;
dwc->has_lpm_erratum = pdata->has_lpm_erratum;
if (pdata->lpm_nyet_threshold)
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d201910..2ece013 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -30,8 +30,10 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/otg.h>
+#include <linux/usb/otg-fsm.h>
#include <linux/phy/phy.h>
+#include <linux/extcon.h>
#define DWC3_MSG_MAX 500
@@ -738,6 +740,10 @@ struct dwc3 {
struct phy *usb2_generic_phy;
struct phy *usb3_generic_phy;
+ struct extcon_dev *edev; /* USB cable events ID & VBUS */
+ struct notifier_block otg_nb; /* notifier for USB cable events */
+ struct otg_fsm *fsm;
+
void __iomem *regs;
size_t regs_size;
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index a3a3b6d5..9552601 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -24,6 +24,7 @@ struct dwc3_platform_data {
enum usb_device_speed maximum_speed;
enum usb_dr_mode dr_mode;
bool tx_fifo_resize;
+ const char *extcon; /* extcon name for USB cable events ID/VBUS */
unsigned is_utmi_l1_suspend:1;
u8 hird_threshold;
--
2.1.0
--
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