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authorIvan T. Ivanov <ivan.ivanov@linaro.org>2015-07-28 11:10:22 +0300
committerFelipe Balbi <balbi@ti.com>2015-07-30 11:43:36 -0500
commit6f98f545b0b4effdf67e83e214a4eb13cd41fba2 (patch)
treed8a8e07266d5dc757730df64c4fafcd2fd3c20aa /drivers/usb/phy/phy-msm-usb.c
parent736d093b5985c1f6583460c8eea1be3c9ee5635e (diff)
usb: phy: msm: Add D+/D- lines route control
apq8016-sbc board is using Dual SPDT USB Switch (TC7USB40MU), witch is controlled by GPIO to de/multiplex D+/D- USB lines to USB2513B Hub and uB connector. Add support for this. Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/phy/phy-msm-usb.c')
-rw-r--r--drivers/usb/phy/phy-msm-usb.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 61d86d8bf5b7..c58c3c0dbe35 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
@@ -32,6 +33,7 @@
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/reboot.h>
#include <linux/reset.h>
#include <linux/usb.h>
@@ -1471,6 +1473,14 @@ static int msm_otg_vbus_notifier(struct notifier_block *nb, unsigned long event,
else
clear_bit(B_SESS_VLD, &motg->inputs);
+ if (test_bit(B_SESS_VLD, &motg->inputs)) {
+ /* Switch D+/D- lines to Device connector */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+ } else {
+ /* Switch D+/D- lines to Hub */
+ gpiod_set_value_cansleep(motg->switch_gpio, 1);
+ }
+
schedule_work(&motg->sm_work);
return NOTIFY_DONE;
@@ -1546,6 +1556,11 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
motg->manual_pullup = of_property_read_bool(node, "qcom,manual-pullup");
+ motg->switch_gpio = devm_gpiod_get_optional(&pdev->dev, "switch",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(motg->switch_gpio))
+ return PTR_ERR(motg->switch_gpio);
+
ext_id = ERR_PTR(-ENODEV);
ext_vbus = ERR_PTR(-ENODEV);
if (of_property_read_bool(node, "extcon")) {
@@ -1617,6 +1632,19 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
return 0;
}
+static int msm_otg_reboot_notify(struct notifier_block *this,
+ unsigned long code, void *unused)
+{
+ struct msm_otg *motg = container_of(this, struct msm_otg, reboot);
+
+ /*
+ * Ensure that D+/D- lines are routed to uB connector, so
+ * we could load bootloader/kernel at next reboot
+ */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+ return NOTIFY_DONE;
+}
+
static int msm_otg_probe(struct platform_device *pdev)
{
struct regulator_bulk_data regs[3];
@@ -1781,6 +1809,17 @@ static int msm_otg_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "Can not create mode change file\n");
}
+ if (test_bit(B_SESS_VLD, &motg->inputs)) {
+ /* Switch D+/D- lines to Device connector */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+ } else {
+ /* Switch D+/D- lines to Hub */
+ gpiod_set_value_cansleep(motg->switch_gpio, 1);
+ }
+
+ motg->reboot.notifier_call = msm_otg_reboot_notify;
+ register_reboot_notifier(&motg->reboot);
+
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
@@ -1807,6 +1846,14 @@ static int msm_otg_remove(struct platform_device *pdev)
if (phy->otg->host || phy->otg->gadget)
return -EBUSY;
+ unregister_reboot_notifier(&motg->reboot);
+
+ /*
+ * Ensure that D+/D- lines are routed to uB connector, so
+ * we could load bootloader/kernel at next reboot
+ */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+
extcon_unregister_notifier(motg->id.extcon, EXTCON_USB_HOST, &motg->id.nb);
extcon_unregister_notifier(motg->vbus.extcon, EXTCON_USB, &motg->vbus.nb);