From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/extcon/extcon-palmas.c | 304 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 304 insertions(+) create mode 100644 drivers/extcon/extcon-palmas.c (limited to 'drivers/extcon/extcon-palmas.c') diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c new file mode 100644 index 000000000..11c6757b6 --- /dev/null +++ b/drivers/extcon/extcon-palmas.c @@ -0,0 +1,304 @@ +/* + * Palmas USB transceiver driver + * + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Author: Graeme Gregory + * Author: Kishon Vijay Abraham I + * + * Based on twl6030_usb.c + * + * Author: Hema HK + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +static const char *palmas_extcon_cable[] = { + [0] = "USB", + [1] = "USB-HOST", + NULL, +}; + +static const int mutually_exclusive[] = {0x3, 0x0}; + +static void palmas_usb_wakeup(struct palmas *palmas, int enable) +{ + if (enable) + palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, + PALMAS_USB_WAKEUP_ID_WK_UP_COMP); + else + palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0); +} + +static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb) +{ + struct palmas_usb *palmas_usb = _palmas_usb; + unsigned int vbus_line_state; + + palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE, + PALMAS_INT3_LINE_STATE, &vbus_line_state); + + if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) { + if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) { + palmas_usb->linkstat = PALMAS_USB_STATE_VBUS; + extcon_set_cable_state(palmas_usb->edev, "USB", true); + dev_info(palmas_usb->dev, "USB cable is attached\n"); + } else { + dev_dbg(palmas_usb->dev, + "Spurious connect event detected\n"); + } + } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) { + if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) { + palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; + extcon_set_cable_state(palmas_usb->edev, "USB", false); + dev_info(palmas_usb->dev, "USB cable is detached\n"); + } else { + dev_dbg(palmas_usb->dev, + "Spurious disconnect event detected\n"); + } + } + + return IRQ_HANDLED; +} + +static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb) +{ + unsigned int set, id_src; + struct palmas_usb *palmas_usb = _palmas_usb; + + palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_ID_INT_LATCH_SET, &set); + palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_ID_INT_SRC, &id_src); + + if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) && + (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_ID_INT_LATCH_CLR, + PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND); + palmas_usb->linkstat = PALMAS_USB_STATE_ID; + extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true); + dev_info(palmas_usb->dev, "USB-HOST cable is attached\n"); + } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) && + (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) { + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_ID_INT_LATCH_CLR, + PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT); + palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; + extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false); + dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); + } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) && + (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) { + palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT; + extcon_set_cable_state(palmas_usb->edev, "USB-HOST", false); + dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); + } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) && + (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) { + palmas_usb->linkstat = PALMAS_USB_STATE_ID; + extcon_set_cable_state(palmas_usb->edev, "USB-HOST", true); + dev_info(palmas_usb->dev, " USB-HOST cable is attached\n"); + } + + return IRQ_HANDLED; +} + +static void palmas_enable_irq(struct palmas_usb *palmas_usb) +{ + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_VBUS_CTRL_SET, + PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP); + + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); + + palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, + PALMAS_USB_ID_INT_EN_HI_SET, + PALMAS_USB_ID_INT_EN_HI_SET_ID_GND | + PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT); + + if (palmas_usb->enable_vbus_detection) + palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); + + /* cold plug for host mode needs this delay */ + if (palmas_usb->enable_id_detection) { + msleep(30); + palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb); + } +} + +static int palmas_usb_probe(struct platform_device *pdev) +{ + struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); + struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct device_node *node = pdev->dev.of_node; + struct palmas_usb *palmas_usb; + int status; + + palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); + if (!palmas_usb) + return -ENOMEM; + + if (node && !pdata) { + palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup"); + palmas_usb->enable_id_detection = of_property_read_bool(node, + "ti,enable-id-detection"); + palmas_usb->enable_vbus_detection = of_property_read_bool(node, + "ti,enable-vbus-detection"); + } else { + palmas_usb->wakeup = true; + palmas_usb->enable_id_detection = true; + palmas_usb->enable_vbus_detection = true; + + if (pdata) + palmas_usb->wakeup = pdata->wakeup; + } + + palmas->usb = palmas_usb; + palmas_usb->palmas = palmas; + + palmas_usb->dev = &pdev->dev; + + palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data, + PALMAS_ID_OTG_IRQ); + palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data, + PALMAS_ID_IRQ); + palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, + PALMAS_VBUS_OTG_IRQ); + palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data, + PALMAS_VBUS_IRQ); + + palmas_usb_wakeup(palmas, palmas_usb->wakeup); + + platform_set_drvdata(pdev, palmas_usb); + + palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev, + palmas_extcon_cable); + if (IS_ERR(palmas_usb->edev)) { + dev_err(&pdev->dev, "failed to allocate extcon device\n"); + return -ENOMEM; + } + palmas_usb->edev->name = kstrdup(node->name, GFP_KERNEL); + palmas_usb->edev->mutually_exclusive = mutually_exclusive; + + status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); + if (status) { + dev_err(&pdev->dev, "failed to register extcon device\n"); + kfree(palmas_usb->edev->name); + return status; + } + + if (palmas_usb->enable_id_detection) { + status = devm_request_threaded_irq(palmas_usb->dev, + palmas_usb->id_irq, + NULL, palmas_id_irq_handler, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | + IRQF_ONESHOT | IRQF_EARLY_RESUME, + "palmas_usb_id", palmas_usb); + if (status < 0) { + dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", + palmas_usb->id_irq, status); + kfree(palmas_usb->edev->name); + return status; + } + } + + if (palmas_usb->enable_vbus_detection) { + status = devm_request_threaded_irq(palmas_usb->dev, + palmas_usb->vbus_irq, NULL, + palmas_vbus_irq_handler, + IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | + IRQF_ONESHOT | IRQF_EARLY_RESUME, + "palmas_usb_vbus", palmas_usb); + if (status < 0) { + dev_err(&pdev->dev, "can't get IRQ %d, err %d\n", + palmas_usb->vbus_irq, status); + kfree(palmas_usb->edev->name); + return status; + } + } + + palmas_enable_irq(palmas_usb); + device_set_wakeup_capable(&pdev->dev, true); + return 0; +} + +static int palmas_usb_remove(struct platform_device *pdev) +{ + struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); + + kfree(palmas_usb->edev->name); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int palmas_usb_suspend(struct device *dev) +{ + struct palmas_usb *palmas_usb = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) { + if (palmas_usb->enable_vbus_detection) + enable_irq_wake(palmas_usb->vbus_irq); + if (palmas_usb->enable_id_detection) + enable_irq_wake(palmas_usb->id_irq); + } + return 0; +} + +static int palmas_usb_resume(struct device *dev) +{ + struct palmas_usb *palmas_usb = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) { + if (palmas_usb->enable_vbus_detection) + disable_irq_wake(palmas_usb->vbus_irq); + if (palmas_usb->enable_id_detection) + disable_irq_wake(palmas_usb->id_irq); + } + return 0; +}; +#endif + +static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume); + +static const struct of_device_id of_palmas_match_tbl[] = { + { .compatible = "ti,palmas-usb", }, + { .compatible = "ti,palmas-usb-vid", }, + { .compatible = "ti,twl6035-usb", }, + { .compatible = "ti,twl6035-usb-vid", }, + { /* end */ } +}; + +static struct platform_driver palmas_usb_driver = { + .probe = palmas_usb_probe, + .remove = palmas_usb_remove, + .driver = { + .name = "palmas-usb", + .of_match_table = of_palmas_match_tbl, + .pm = &palmas_pm_ops, + }, +}; + +module_platform_driver(palmas_usb_driver); + +MODULE_ALIAS("platform:palmas-usb"); +MODULE_AUTHOR("Graeme Gregory "); +MODULE_DESCRIPTION("Palmas USB transceiver driver"); +MODULE_LICENSE("GPL"); +MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); -- cgit v1.2.3-54-g00ecf