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dwc3-msm: Add USB role switch handling

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This change adds USB role switch framework based USB role
switch device which allows USB connector device driver to
notify about USB device/host mode to start required USB
stack.

Change-Id: Icfd1aabea939765944a1c3a95f31d7b3a47f1338
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mayank Rana 2020-01-27 14:50:15 -08:00
commit a6f73bd804
1 changed files with 94 additions and 1 deletions
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95
drivers/usb/dwc3/dwc3-msm.c
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@ -39,6 +39,7 @@
#include <linux/extcon.h>
#include <linux/reset.h>
#include <linux/usb/dwc3-msm.h>
#include <linux/usb/role.h>
#include "core.h"
#include "gadget.h"
@ -362,6 +363,12 @@ static const char * const gsi_op_strings[] = {
"FREE_TRBS", "SET_CLR_BLOCK_DBL", "CHECK_FOR_SUSP",
"EP_DISABLE" };
static const char * const usb_role_strings[] = {
"NONE",
"HOST",
"DEVICE"
};
struct dwc3_msm;
struct extcon_nb {
@ -471,6 +478,8 @@ struct dwc3_msm {
u64 dummy_gsi_db;
dma_addr_t dummy_gsi_db_dma;
struct usb_role_switch *role_switch;
};
#define USB_HSPHY_3P3_VOL_MIN 3050000 /* uV */
@ -3551,6 +3560,79 @@ static int dwc3_msm_extcon_register(struct dwc3_msm *mdwc)
return 0;
}
static inline const char *usb_role_string(enum usb_role role)
{
if (role < ARRAY_SIZE(usb_role_strings))
return usb_role_strings[role];
return "Invalid";
}
static enum usb_role dwc3_msm_usb_get_role(struct device *dev)
{
struct dwc3_msm *mdwc = dev_get_drvdata(dev);
struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);
enum usb_role role;
if (mdwc->vbus_active)
role = USB_ROLE_DEVICE;
else if (mdwc->id_state == DWC3_ID_GROUND)
role = USB_ROLE_HOST;
else
role = USB_ROLE_NONE;
dbg_log_string("get_role:%s\n", usb_role_string(role));
return role;
}
static int dwc3_msm_usb_set_role(struct device *dev, enum usb_role role)
{
struct dwc3_msm *mdwc = dev_get_drvdata(dev);
struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);
enum usb_role cur_role = USB_ROLE_NONE;
cur_role = dwc3_msm_usb_get_role(dev);
switch (role) {
case USB_ROLE_HOST:
mdwc->vbus_active = false;
mdwc->id_state = DWC3_ID_GROUND;
break;
case USB_ROLE_DEVICE:
mdwc->vbus_active = true;
mdwc->id_state = DWC3_ID_FLOAT;
break;
case USB_ROLE_NONE:
mdwc->vbus_active = false;
mdwc->id_state = DWC3_ID_FLOAT;
break;
}
dbg_log_string("cur_role:%s new_role:%s\n", usb_role_string(cur_role),
usb_role_string(role));
/*
* For boot up without USB cable connected case, don't check
* previous role value to allow resetting USB controller and
* PHYs.
*/
if (mdwc->drd_state != DRD_STATE_UNDEFINED && cur_role == role) {
dbg_log_string("no USB role change");
return 0;
}
dwc3_ext_event_notify(mdwc);
return 0;
}
static struct usb_role_switch_desc role_desc = {
.set = dwc3_msm_usb_set_role,
.get = dwc3_msm_usb_get_role,
.allow_userspace_control = true,
};
static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -4112,7 +4194,17 @@ static int dwc3_msm_probe(struct platform_device *pdev)
} else {
queue_delayed_work(mdwc->sm_usb_wq, &mdwc->sm_work, 0);
}
} else {
}
if (of_property_read_bool(node, "usb-role-switch")) {
role_desc.fwnode = dev_fwnode(&pdev->dev);
mdwc->role_switch = usb_role_switch_register(mdwc->dev,
&role_desc);
if (IS_ERR(mdwc->role_switch))
return PTR_ERR(mdwc->role_switch);
}
if (!mdwc->role_switch && !mdwc->extcon) {
switch (dwc->dr_mode) {
case USB_DR_MODE_OTG:
if (of_property_read_bool(node,
@ -4168,6 +4260,7 @@ static int dwc3_msm_remove(struct platform_device *pdev)
struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);
int i, ret_pm;
usb_role_switch_unregister(mdwc->role_switch);
device_remove_file(&pdev->dev, &dev_attr_mode);
device_remove_file(&pdev->dev, &dev_attr_speed);
device_remove_file(&pdev->dev, &dev_attr_bus_vote);