diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/otg/tegra-otg.c | 155 |
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) { |