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authorRakesh Bodla <rbodla@nvidia.com>2013-12-10 12:25:07 +0530
committerManish Tuteja <mtuteja@nvidia.com>2014-01-16 17:20:23 -0800
commit13a7fc8b9f53d47138e72c46005caf79df784857 (patch)
tree6ee43f0c6833966480e3e24611a957847ef1d559
parentc6e25ed020f100691991f879d21cfc8190d75fb5 (diff)
usb: otg: tegra: add support for OTG Y-cabledaily-2014.02.03.0_rel-roth-r3-partner
Below changes are made to support Y-cable (i) Bring vbus control into OTG driver if port is OTG. (ii) Detect Y-cable. (iii) Add vbus_bat_chg charging regulator. Bug 1375608 Change-Id: I41bab08ebce15d3f356c624de0b62ff8e4cc4a28 Signed-off-by: Rakesh Bodla <rbodla@nvidia.com> Reviewed-on: http://git-master/r/336278 Reviewed-by: Automatic_Commit_Validation_User GVS: Gerrit_Virtual_Submit Reviewed-by: Venkat Moganty <vmoganty@nvidia.com> Reviewed-on: http://git-master/r/356813 Reviewed-by: Manish Tuteja <mtuteja@nvidia.com> Tested-by: Manish Tuteja <mtuteja@nvidia.com>
-rw-r--r--drivers/usb/otg/tegra-otg.c155
1 files changed, 140 insertions, 15 deletions
diff --git a/drivers/usb/otg/tegra-otg.c b/drivers/usb/otg/tegra-otg.c
index bd7d6e11501b..df4806a5c6b5 100644
--- a/drivers/usb/otg/tegra-otg.c
+++ b/drivers/usb/otg/tegra-otg.c
@@ -3,7 +3,7 @@
*
* OTG transceiver driver for Tegra UTMI phy
*
- * Copyright (C) 2010-2012 NVIDIA CORPORATION. All rights reserved.
+ * Copyright (C) 2010-2013 NVIDIA CORPORATION. All rights reserved.
* Copyright (C) 2010 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify it
@@ -32,6 +32,7 @@
#include <linux/err.h>
#include <linux/export.h>
#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
#define USB_PHY_WAKEUP 0x408
#define USB_ID_INT_EN (1 << 0)
@@ -51,6 +52,8 @@
#define DBG(stuff...) do {} while (0)
#endif
+#define YCABLE_CHARGING_CURRENT_UA 500000u
+
struct tegra_otg_data {
struct platform_device *pdev;
struct tegra_usb_otg_data *pdata;
@@ -62,7 +65,12 @@ struct tegra_otg_data {
struct clk *clk;
int irq;
struct work_struct work;
+ struct regulator *vbus_reg;
+ struct regulator *vbus_bat_reg;
unsigned int intr_reg_data;
+ bool support_y_cable;
+ bool y_cable_conn;
+ bool turn_off_vbus_on_lp0;
bool clk_enabled;
bool interrupt_mode;
bool builtin_host;
@@ -190,6 +198,74 @@ static void tegra_otg_notify_event(struct tegra_otg_data *tegra, int event)
atomic_notifier_call_chain(&tegra->phy.notifier, event, tegra->phy.otg->gadget);
}
+static void tegra_otg_set_current(struct regulator *vbus_bat_reg, int max_uA)
+{
+ if (vbus_bat_reg == NULL)
+ return ;
+
+ regulator_set_current_limit(vbus_bat_reg, 0, max_uA);
+}
+
+static void tegra_otg_vbus_enable(struct regulator *vbus_reg, int on)
+{
+ static int vbus_enable = 1;
+
+ if (vbus_reg == NULL)
+ return ;
+ DBG("%s(%d) vbus_enable = %d on = %d\n", __func__, __LINE__,
+ vbus_enable, on);
+
+ if (on && vbus_enable) {
+ regulator_enable(vbus_reg);
+ vbus_enable = 0;
+ } else if (!on && !vbus_enable) {
+ regulator_disable(vbus_reg);
+ vbus_enable = 1;
+ }
+}
+
+static int tegra_otg_start_host(struct tegra_otg_data *tegra, int on)
+{
+ if (on) {
+ if (tegra->support_y_cable &&
+ (tegra->int_status & USB_VBUS_STATUS)) {
+ DBG("%s(%d) set current %dmA\n", __func__, __LINE__,
+ YCABLE_CHARGING_CURRENT_UA/1000);
+ tegra_otg_set_current(tegra->vbus_bat_reg,
+ YCABLE_CHARGING_CURRENT_UA);
+ tegra->y_cable_conn = true;
+ } else {
+ tegra_otg_vbus_enable(tegra->vbus_reg, 1);
+ }
+ tegra_start_host(tegra);
+ tegra_otg_notify_event(tegra, USB_EVENT_ID);
+ } else {
+ tegra_stop_host(tegra);
+ tegra_otg_notify_event(tegra, USB_EVENT_NONE);
+ tegra_otg_vbus_enable(tegra->vbus_reg, 0);
+ if (tegra->support_y_cable && tegra->y_cable_conn) {
+ tegra_otg_set_current(tegra->vbus_bat_reg, 0);
+ tegra->y_cable_conn = false;
+ }
+ }
+ return 0;
+}
+
+static int tegra_otg_start_gadget(struct tegra_otg_data *tegra, int on)
+{
+ struct usb_otg *otg = tegra->phy.otg;
+
+ if (on) {
+ usb_gadget_vbus_connect(otg->gadget);
+ tegra_otg_notify_event(tegra, USB_EVENT_VBUS);
+ } else {
+ usb_gadget_vbus_disconnect(otg->gadget);
+ tegra_otg_notify_event(tegra, USB_EVENT_NONE);
+ }
+
+ return 0;
+}
+
static void tegra_change_otg_state(struct tegra_otg_data *tegra,
enum usb_otg_state to)
{
@@ -209,20 +285,23 @@ static void tegra_change_otg_state(struct tegra_otg_data *tegra,
pr_info("otg state changed: %s --> %s\n", tegra_state_name(from), tegra_state_name(to));
if (from == OTG_STATE_A_SUSPEND) {
- if (to == OTG_STATE_B_PERIPHERAL && otg->gadget) {
- usb_gadget_vbus_connect(otg->gadget);
- tegra_otg_notify_event(tegra, USB_EVENT_VBUS);
- }
- else if (to == OTG_STATE_A_HOST) {
- tegra_start_host(tegra);
- tegra_otg_notify_event(tegra, USB_EVENT_ID);
- }
+ if (to == OTG_STATE_B_PERIPHERAL && otg->gadget)
+ tegra_otg_start_gadget(tegra, 1);
+ else if (to == OTG_STATE_A_HOST)
+ tegra_otg_start_host(tegra, 1);
} else if (from == OTG_STATE_A_HOST && to == OTG_STATE_A_SUSPEND) {
- tegra_stop_host(tegra);
- tegra_otg_notify_event(tegra, USB_EVENT_NONE);
+ tegra_otg_start_host(tegra, 0);
} else if (from == OTG_STATE_B_PERIPHERAL && otg->gadget && to == OTG_STATE_A_SUSPEND) {
- usb_gadget_vbus_disconnect(otg->gadget);
- tegra_otg_notify_event(tegra, USB_EVENT_NONE);
+ tegra_otg_start_gadget(tegra, 0);
+ }
+ }
+
+ if (tegra->support_y_cable && tegra->y_cable_conn &&
+ from == to && from == OTG_STATE_A_HOST) {
+ if (!(tegra->int_status & USB_VBUS_STATUS)) {
+ DBG("%s(%d) Charger disconnect\n", __func__, __LINE__);
+ tegra_otg_set_current(tegra->vbus_bat_reg, 0);
+ tegra_otg_vbus_enable(tegra->vbus_reg, 1);
}
}
}
@@ -421,6 +500,9 @@ static int tegra_otg_probe(struct platform_device *pdev)
tegra_clone = tegra;
tegra->interrupt_mode = true;
tegra->suspended = false;
+ tegra->turn_off_vbus_on_lp0 = true;
+ tegra->support_y_cable = true;
+ tegra->y_cable_conn = false;
tegra->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(tegra->clk)) {
@@ -465,6 +547,22 @@ static int tegra_otg_probe(struct platform_device *pdev)
err = 0;
}
+ tegra->vbus_reg = regulator_get(&pdev->dev, "usb_vbus");
+ if (IS_ERR_OR_NULL(tegra->vbus_reg)) {
+ pr_err("failed to get regulator usb_vbus: %ld\n",
+ PTR_ERR(tegra->vbus_reg));
+ tegra->vbus_reg = NULL;
+ }
+
+ if (tegra->support_y_cable) {
+ tegra->vbus_bat_reg = regulator_get(&pdev->dev, "usb_bat_chg");
+ if (IS_ERR_OR_NULL(tegra->vbus_bat_reg)) {
+ pr_err("failed to get regulator usb_bat_chg: %ld\n",
+ PTR_ERR(tegra->vbus_bat_reg));
+ tegra->vbus_bat_reg = NULL;
+ }
+ }
+
INIT_WORK(&tegra->work, irq_work);
tegra->phy.dev = &pdev->dev;
@@ -502,6 +600,11 @@ err_irq:
err_io:
clk_put(tegra->clk);
err_clk:
+ if (tegra->vbus_reg)
+ regulator_put(tegra->vbus_reg);
+ if (tegra->support_y_cable && tegra->vbus_bat_reg)
+ regulator_put(tegra->vbus_bat_reg);
+
return err;
}
@@ -509,6 +612,12 @@ static int __exit tegra_otg_remove(struct platform_device *pdev)
{
struct tegra_otg_data *tegra = platform_get_drvdata(pdev);
+ if (tegra->vbus_reg)
+ regulator_put(tegra->vbus_reg);
+
+ if (tegra->support_y_cable && tegra->vbus_bat_reg)
+ regulator_put(tegra->vbus_bat_reg);
+
pm_runtime_disable(tegra->phy.dev);
usb_set_transceiver(NULL);
iounmap(tegra->regs);
@@ -544,6 +653,9 @@ static int tegra_otg_suspend(struct device *dev)
if (from == OTG_STATE_B_PERIPHERAL)
tegra_change_otg_state(tegra, OTG_STATE_A_SUSPEND);
+ if (from == OTG_STATE_A_HOST && tegra->turn_off_vbus_on_lp0)
+ tegra_otg_vbus_enable(tegra->vbus_reg, 0);
+
tegra->suspended = true;
DBG("%s(%d) END\n", __func__, __LINE__);
@@ -583,8 +695,21 @@ static void tegra_otg_resume(struct device *dev)
else
tegra->int_status = val | USB_VBUS_INT_EN | USB_VBUS_WAKEUP_EN |
USB_ID_PIN_WAKEUP_EN;
-
spin_unlock_irqrestore(&tegra->lock, flags);
+
+ if (tegra->turn_off_vbus_on_lp0 &&
+ !(tegra->int_status & USB_ID_STATUS)) {
+ /* Handle Y-cable */
+ if (tegra->support_y_cable &&
+ (tegra->int_status & USB_VBUS_STATUS)) {
+ tegra_otg_set_current(tegra->vbus_bat_reg,
+ YCABLE_CHARGING_CURRENT_UA);
+ tegra->y_cable_conn = true;
+ } else {
+ tegra_otg_vbus_enable(tegra->vbus_reg, 1);
+ }
+ }
+
schedule_work(&tegra->work);
enable_interrupt(tegra, true);
@@ -616,7 +741,7 @@ static int __init tegra_otg_init(void)
{
return platform_driver_register(&tegra_otg_driver);
}
-subsys_initcall(tegra_otg_init);
+fs_initcall(tegra_otg_init);
static void __exit tegra_otg_exit(void)
{