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usb: mtu3: dual-role mode support

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support dual-role mode; there are two ways to switch between
host and device modes, one is by idpin, another is by debugfs
which depends on user input.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun
2016-10-19 10:28:26 +08:00
committed by Greg Kroah-Hartman
parent b3f4e727c1
commit d0ed062a8b
9 changed files with 557 additions and 21 deletions
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86
drivers/usb/mtu3/mtu3_plat.c
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@@ -142,13 +142,10 @@ static int ssusb_rscs_init(struct ssusb_mtk *ssusb)
phy_err:
ssusb_phy_exit(ssusb);
phy_init_err:
clk_disable_unprepare(ssusb->sys_clk);
clk_err:
regulator_disable(ssusb->vusb33);
vusb33_err:
return ret;
@@ -170,10 +167,39 @@ static void ssusb_ip_sw_reset(struct ssusb_mtk *ssusb)
mtu3_clrbits(ssusb->ippc_base, U3D_SSUSB_IP_PW_CTRL0, SSUSB_IP_SW_RST);
}
static int get_iddig_pinctrl(struct ssusb_mtk *ssusb)
{
struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
otg_sx->id_pinctrl = devm_pinctrl_get(ssusb->dev);
if (IS_ERR(otg_sx->id_pinctrl)) {
dev_err(ssusb->dev, "Cannot find id pinctrl!\n");
return PTR_ERR(otg_sx->id_pinctrl);
}
otg_sx->id_float =
pinctrl_lookup_state(otg_sx->id_pinctrl, "id_float");
if (IS_ERR(otg_sx->id_float)) {
dev_err(ssusb->dev, "Cannot find pinctrl id_float!\n");
return PTR_ERR(otg_sx->id_float);
}
otg_sx->id_ground =
pinctrl_lookup_state(otg_sx->id_pinctrl, "id_ground");
if (IS_ERR(otg_sx->id_ground)) {
dev_err(ssusb->dev, "Cannot find pinctrl id_ground!\n");
return PTR_ERR(otg_sx->id_ground);
}
return 0;
}
static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
{
struct device_node *node = pdev->dev.of_node;
struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
struct device *dev = &pdev->dev;
struct regulator *vbus;
struct resource *res;
int i;
int ret;
@@ -230,6 +256,37 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
if (ret)
return ret;
if (ssusb->dr_mode != USB_DR_MODE_OTG)
return 0;
/* if dual-role mode is supported */
vbus = devm_regulator_get(&pdev->dev, "vbus");
if (IS_ERR(vbus)) {
dev_err(dev, "failed to get vbus\n");
return PTR_ERR(vbus);
}
otg_sx->vbus = vbus;
otg_sx->is_u3_drd = of_property_read_bool(node, "mediatek,usb3-drd");
otg_sx->manual_drd_enabled =
of_property_read_bool(node, "enable-manual-drd");
if (of_property_read_bool(node, "extcon")) {
otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
if (IS_ERR(otg_sx->edev)) {
dev_err(ssusb->dev, "couldn't get extcon device\n");
return -EPROBE_DEFER;
}
if (otg_sx->manual_drd_enabled) {
ret = get_iddig_pinctrl(ssusb);
if (ret)
return ret;
}
}
dev_info(dev, "dr_mode: %d, is_u3_dr: %d\n",
ssusb->dr_mode, otg_sx->is_u3_drd);
return 0;
}
@@ -292,6 +349,21 @@ static int mtu3_probe(struct platform_device *pdev)
goto comm_exit;
}
break;
case USB_DR_MODE_OTG:
ret = ssusb_gadget_init(ssusb);
if (ret) {
dev_err(dev, "failed to initialize gadget\n");
goto comm_exit;
}
ret = ssusb_host_init(ssusb, node);
if (ret) {
dev_err(dev, "failed to initialize host\n");
goto gadget_exit;
}
ssusb_otg_switch_init(ssusb);
break;
default:
dev_err(dev, "unsupported mode: %d\n", ssusb->dr_mode);
ret = -EINVAL;
@@ -300,9 +372,10 @@ static int mtu3_probe(struct platform_device *pdev)
return 0;
gadget_exit:
ssusb_gadget_exit(ssusb);
comm_exit:
ssusb_rscs_exit(ssusb);
comm_init_err:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
@@ -321,6 +394,11 @@ static int mtu3_remove(struct platform_device *pdev)
case USB_DR_MODE_HOST:
ssusb_host_exit(ssusb);
break;
case USB_DR_MODE_OTG:
ssusb_otg_switch_exit(ssusb);
ssusb_gadget_exit(ssusb);
ssusb_host_exit(ssusb);
break;
default:
return -EINVAL;
}