| /* |
| * 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 <gg@slimlogic.co.uk> |
| * Author: Kishon Vijay Abraham I <kishon@ti.com> |
| * |
| * Based on twl6030_usb.c |
| * |
| * Author: Hema HK <hemahk@ti.com> |
| * |
| * 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 <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/mfd/palmas.h> |
| #include <linux/of.h> |
| #include <linux/of_platform.h> |
| |
| 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.supported_cable = palmas_extcon_cable; |
| palmas_usb->edev.dev.parent = palmas_usb->dev; |
| palmas_usb->edev.name = kstrdup(node->name, GFP_KERNEL); |
| palmas_usb->edev.mutually_exclusive = mutually_exclusive; |
| |
| status = extcon_dev_register(&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); |
| goto fail_extcon; |
| } |
| } |
| |
| 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); |
| goto fail_extcon; |
| } |
| } |
| |
| palmas_enable_irq(palmas_usb); |
| device_set_wakeup_capable(&pdev->dev, true); |
| return 0; |
| |
| fail_extcon: |
| extcon_dev_unregister(&palmas_usb->edev); |
| kfree(palmas_usb->edev.name); |
| |
| return status; |
| } |
| |
| static int palmas_usb_remove(struct platform_device *pdev) |
| { |
| struct palmas_usb *palmas_usb = platform_get_drvdata(pdev); |
| |
| extcon_dev_unregister(&palmas_usb->edev); |
| 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 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, |
| .owner = THIS_MODULE, |
| .pm = &palmas_pm_ops, |
| }, |
| }; |
| |
| module_platform_driver(palmas_usb_driver); |
| |
| MODULE_ALIAS("platform:palmas-usb"); |
| MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); |
| MODULE_DESCRIPTION("Palmas USB transceiver driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DEVICE_TABLE(of, of_palmas_match_tbl); |