diff options
Diffstat (limited to 'drivers/usb/otg/gpio_vbus.c')
| -rw-r--r-- | drivers/usb/otg/gpio_vbus.c | 416 |
1 files changed, 0 insertions, 416 deletions
diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c deleted file mode 100644 index a7d4ac591982..000000000000 --- a/drivers/usb/otg/gpio_vbus.c +++ /dev/null @@ -1,416 +0,0 @@ -/* - * gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices - * - * Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/kernel.h> -#include <linux/platform_device.h> -#include <linux/gpio.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/interrupt.h> -#include <linux/usb.h> -#include <linux/workqueue.h> - -#include <linux/regulator/consumer.h> - -#include <linux/usb/gadget.h> -#include <linux/usb/gpio_vbus.h> -#include <linux/usb/otg.h> - - -/* - * A simple GPIO VBUS sensing driver for B peripheral only devices - * with internal transceivers. It can control a D+ pullup GPIO and - * a regulator to limit the current drawn from VBUS. - * - * Needs to be loaded before the UDC driver that will use it. - */ -struct gpio_vbus_data { - struct usb_phy phy; - struct device *dev; - struct regulator *vbus_draw; - int vbus_draw_enabled; - unsigned mA; - struct delayed_work work; - int vbus; - int irq; -}; - - -/* - * This driver relies on "both edges" triggering. VBUS has 100 msec to - * stabilize, so the peripheral controller driver may need to cope with - * some bouncing due to current surges (e.g. charging local capacitance) - * and contact chatter. - * - * REVISIT in desperate straits, toggling between rising and falling - * edges might be workable. - */ -#define VBUS_IRQ_FLAGS \ - (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING) - - -/* interface to regulator framework */ -static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA) -{ - struct regulator *vbus_draw = gpio_vbus->vbus_draw; - int enabled; - - if (!vbus_draw) - return; - - enabled = gpio_vbus->vbus_draw_enabled; - if (mA) { - regulator_set_current_limit(vbus_draw, 0, 1000 * mA); - if (!enabled) { - regulator_enable(vbus_draw); - gpio_vbus->vbus_draw_enabled = 1; - } - } else { - if (enabled) { - regulator_disable(vbus_draw); - gpio_vbus->vbus_draw_enabled = 0; - } - } - gpio_vbus->mA = mA; -} - -static int is_vbus_powered(struct gpio_vbus_mach_info *pdata) -{ - int vbus; - - vbus = gpio_get_value(pdata->gpio_vbus); - if (pdata->gpio_vbus_inverted) - vbus = !vbus; - - return vbus; -} - -static void gpio_vbus_work(struct work_struct *work) -{ - struct gpio_vbus_data *gpio_vbus = - container_of(work, struct gpio_vbus_data, work.work); - struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data; - int gpio, status, vbus; - - if (!gpio_vbus->phy.otg->gadget) - return; - - vbus = is_vbus_powered(pdata); - if ((vbus ^ gpio_vbus->vbus) == 0) - return; - gpio_vbus->vbus = vbus; - - /* Peripheral controllers which manage the pullup themselves won't have - * gpio_pullup configured here. If it's configured here, we'll do what - * isp1301_omap::b_peripheral() does and enable the pullup here... although - * that may complicate usb_gadget_{,dis}connect() support. - */ - gpio = pdata->gpio_pullup; - - if (vbus) { - status = USB_EVENT_VBUS; - gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL; - gpio_vbus->phy.last_event = status; - usb_gadget_vbus_connect(gpio_vbus->phy.otg->gadget); - - /* drawing a "unit load" is *always* OK, except for OTG */ - set_vbus_draw(gpio_vbus, 100); - - /* optionally enable D+ pullup */ - if (gpio_is_valid(gpio)) - gpio_set_value(gpio, !pdata->gpio_pullup_inverted); - - atomic_notifier_call_chain(&gpio_vbus->phy.notifier, - status, gpio_vbus->phy.otg->gadget); - } else { - /* optionally disable D+ pullup */ - if (gpio_is_valid(gpio)) - gpio_set_value(gpio, pdata->gpio_pullup_inverted); - - set_vbus_draw(gpio_vbus, 0); - - usb_gadget_vbus_disconnect(gpio_vbus->phy.otg->gadget); - status = USB_EVENT_NONE; - gpio_vbus->phy.state = OTG_STATE_B_IDLE; - gpio_vbus->phy.last_event = status; - - atomic_notifier_call_chain(&gpio_vbus->phy.notifier, - status, gpio_vbus->phy.otg->gadget); - } -} - -/* VBUS change IRQ handler */ -static irqreturn_t gpio_vbus_irq(int irq, void *data) -{ - struct platform_device *pdev = data; - struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data; - struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev); - struct usb_otg *otg = gpio_vbus->phy.otg; - - dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n", - is_vbus_powered(pdata) ? "supplied" : "inactive", - otg->gadget ? otg->gadget->name : "none"); - - if (otg->gadget) - schedule_delayed_work(&gpio_vbus->work, msecs_to_jiffies(100)); - - return IRQ_HANDLED; -} - -/* OTG transceiver interface */ - -/* bind/unbind the peripheral controller */ -static int gpio_vbus_set_peripheral(struct usb_otg *otg, - struct usb_gadget *gadget) -{ - struct gpio_vbus_data *gpio_vbus; - struct gpio_vbus_mach_info *pdata; - struct platform_device *pdev; - int gpio; - - gpio_vbus = container_of(otg->phy, struct gpio_vbus_data, phy); - pdev = to_platform_device(gpio_vbus->dev); - pdata = gpio_vbus->dev->platform_data; - gpio = pdata->gpio_pullup; - - if (!gadget) { - dev_dbg(&pdev->dev, "unregistering gadget '%s'\n", - otg->gadget->name); - - /* optionally disable D+ pullup */ - if (gpio_is_valid(gpio)) - gpio_set_value(gpio, pdata->gpio_pullup_inverted); - - set_vbus_draw(gpio_vbus, 0); - - usb_gadget_vbus_disconnect(otg->gadget); - otg->phy->state = OTG_STATE_UNDEFINED; - - otg->gadget = NULL; - return 0; - } - - otg->gadget = gadget; - dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name); - - /* initialize connection state */ - gpio_vbus->vbus = 0; /* start with disconnected */ - gpio_vbus_irq(gpio_vbus->irq, pdev); - return 0; -} - -/* effective for B devices, ignored for A-peripheral */ -static int gpio_vbus_set_power(struct usb_phy *phy, unsigned mA) -{ - struct gpio_vbus_data *gpio_vbus; - - gpio_vbus = container_of(phy, struct gpio_vbus_data, phy); - - if (phy->state == OTG_STATE_B_PERIPHERAL) - set_vbus_draw(gpio_vbus, mA); - return 0; -} - -/* for non-OTG B devices: set/clear transceiver suspend mode */ -static int gpio_vbus_set_suspend(struct usb_phy *phy, int suspend) -{ - struct gpio_vbus_data *gpio_vbus; - - gpio_vbus = container_of(phy, struct gpio_vbus_data, phy); - - /* draw max 0 mA from vbus in suspend mode; or the previously - * recorded amount of current if not suspended - * - * NOTE: high powered configs (mA > 100) may draw up to 2.5 mA - * if they're wake-enabled ... we don't handle that yet. - */ - return gpio_vbus_set_power(phy, suspend ? 0 : gpio_vbus->mA); -} - -/* platform driver interface */ - -static int __init gpio_vbus_probe(struct platform_device *pdev) -{ - struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data; - struct gpio_vbus_data *gpio_vbus; - struct resource *res; - int err, gpio, irq; - unsigned long irqflags; - - if (!pdata || !gpio_is_valid(pdata->gpio_vbus)) - return -EINVAL; - gpio = pdata->gpio_vbus; - - gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL); - if (!gpio_vbus) - return -ENOMEM; - - gpio_vbus->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL); - if (!gpio_vbus->phy.otg) { - kfree(gpio_vbus); - return -ENOMEM; - } - - platform_set_drvdata(pdev, gpio_vbus); - gpio_vbus->dev = &pdev->dev; - gpio_vbus->phy.label = "gpio-vbus"; - gpio_vbus->phy.set_power = gpio_vbus_set_power; - gpio_vbus->phy.set_suspend = gpio_vbus_set_suspend; - gpio_vbus->phy.state = OTG_STATE_UNDEFINED; - - gpio_vbus->phy.otg->phy = &gpio_vbus->phy; - gpio_vbus->phy.otg->set_peripheral = gpio_vbus_set_peripheral; - - err = gpio_request(gpio, "vbus_detect"); - if (err) { - dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n", - gpio, err); - goto err_gpio; - } - gpio_direction_input(gpio); - - res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (res) { - irq = res->start; - irqflags = (res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED; - } else { - irq = gpio_to_irq(gpio); - irqflags = VBUS_IRQ_FLAGS; - } - - gpio_vbus->irq = irq; - - /* if data line pullup is in use, initialize it to "not pulling up" */ - gpio = pdata->gpio_pullup; - if (gpio_is_valid(gpio)) { - err = gpio_request(gpio, "udc_pullup"); - if (err) { - dev_err(&pdev->dev, - "can't request pullup gpio %d, err: %d\n", - gpio, err); - gpio_free(pdata->gpio_vbus); - goto err_gpio; - } - gpio_direction_output(gpio, pdata->gpio_pullup_inverted); - } - - err = request_irq(irq, gpio_vbus_irq, irqflags, "vbus_detect", pdev); - if (err) { - dev_err(&pdev->dev, "can't request irq %i, err: %d\n", - irq, err); - goto err_irq; - } - - ATOMIC_INIT_NOTIFIER_HEAD(&gpio_vbus->phy.notifier); - - INIT_DELAYED_WORK(&gpio_vbus->work, gpio_vbus_work); - - gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw"); - if (IS_ERR(gpio_vbus->vbus_draw)) { - dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n", - PTR_ERR(gpio_vbus->vbus_draw)); - gpio_vbus->vbus_draw = NULL; - } - - /* only active when a gadget is registered */ - err = usb_add_phy(&gpio_vbus->phy, USB_PHY_TYPE_USB2); - if (err) { - dev_err(&pdev->dev, "can't register transceiver, err: %d\n", - err); - goto err_otg; - } - - device_init_wakeup(&pdev->dev, pdata->wakeup); - - return 0; -err_otg: - regulator_put(gpio_vbus->vbus_draw); - free_irq(irq, pdev); -err_irq: - if (gpio_is_valid(pdata->gpio_pullup)) - gpio_free(pdata->gpio_pullup); - gpio_free(pdata->gpio_vbus); -err_gpio: - platform_set_drvdata(pdev, NULL); - kfree(gpio_vbus->phy.otg); - kfree(gpio_vbus); - return err; -} - -static int __exit gpio_vbus_remove(struct platform_device *pdev) -{ - struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev); - struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data; - int gpio = pdata->gpio_vbus; - - device_init_wakeup(&pdev->dev, 0); - cancel_delayed_work_sync(&gpio_vbus->work); - regulator_put(gpio_vbus->vbus_draw); - - usb_remove_phy(&gpio_vbus->phy); - - free_irq(gpio_vbus->irq, pdev); - if (gpio_is_valid(pdata->gpio_pullup)) - gpio_free(pdata->gpio_pullup); - gpio_free(gpio); - platform_set_drvdata(pdev, NULL); - kfree(gpio_vbus->phy.otg); - kfree(gpio_vbus); - - return 0; -} - -#ifdef CONFIG_PM -static int gpio_vbus_pm_suspend(struct device *dev) -{ - struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev); - - if (device_may_wakeup(dev)) - enable_irq_wake(gpio_vbus->irq); - - return 0; -} - -static int gpio_vbus_pm_resume(struct device *dev) -{ - struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev); - - if (device_may_wakeup(dev)) - disable_irq_wake(gpio_vbus->irq); - - return 0; -} - -static const struct dev_pm_ops gpio_vbus_dev_pm_ops = { - .suspend = gpio_vbus_pm_suspend, - .resume = gpio_vbus_pm_resume, -}; -#endif - -/* NOTE: the gpio-vbus device may *NOT* be hotplugged */ - -MODULE_ALIAS("platform:gpio-vbus"); - -static struct platform_driver gpio_vbus_driver = { - .driver = { - .name = "gpio-vbus", - .owner = THIS_MODULE, -#ifdef CONFIG_PM - .pm = &gpio_vbus_dev_pm_ops, -#endif - }, - .remove = __exit_p(gpio_vbus_remove), -}; - -module_platform_driver_probe(gpio_vbus_driver, gpio_vbus_probe); - -MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver"); -MODULE_AUTHOR("Philipp Zabel"); -MODULE_LICENSE("GPL"); |