/* * 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> #include <linux/of_gpio.h> #include <linux/gpio/consumer.h> #include <linux/workqueue.h> #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ static const unsigned int palmas_extcon_cable[] = { EXTCON_USB, EXTCON_USB_HOST, EXTCON_NONE, }; 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; struct extcon_dev *edev = palmas_usb->edev; 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_(edev, EXTCON_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_(edev, EXTCON_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; struct extcon_dev *edev = palmas_usb->edev; 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_(edev, EXTCON_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_(edev, EXTCON_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_(edev, EXTCON_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_(edev, EXTCON_USB_HOST, true); dev_info(palmas_usb->dev, " USB-HOST cable is attached\n"); } return IRQ_HANDLED; } static void palmas_gpio_id_detect(struct work_struct *work) { int id; struct palmas_usb *palmas_usb = container_of(to_delayed_work(work), struct palmas_usb, wq_detectid); struct extcon_dev *edev = palmas_usb->edev; if (!palmas_usb->id_gpiod) return; id = gpiod_get_value_cansleep(palmas_usb->id_gpiod); if (id) { extcon_set_cable_state_(edev, EXTCON_USB_HOST, false); dev_info(palmas_usb->dev, "USB-HOST cable is detached\n"); } else { extcon_set_cable_state_(edev, EXTCON_USB_HOST, true); dev_info(palmas_usb->dev, "USB-HOST cable is attached\n"); } } static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb) { struct palmas_usb *palmas_usb = _palmas_usb; queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid, palmas_usb->sw_debounce_jiffies); 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); if (palmas_usb->enable_id_detection) { 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->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN); if (IS_ERR(palmas_usb->id_gpiod)) { dev_err(&pdev->dev, "failed to get id gpio\n"); return PTR_ERR(palmas_usb->id_gpiod); } palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", GPIOD_IN); if (IS_ERR(palmas_usb->vbus_gpiod)) { dev_err(&pdev->dev, "failed to get vbus gpio\n"); return PTR_ERR(palmas_usb->vbus_gpiod); } if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) { palmas_usb->enable_id_detection = false; palmas_usb->enable_gpio_id_detection = true; } if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) { palmas_usb->enable_vbus_detection = false; palmas_usb->enable_gpio_vbus_detection = true; } if (palmas_usb->enable_gpio_id_detection) { u32 debounce; if (of_property_read_u32(node, "debounce-delay-ms", &debounce)) debounce = USB_GPIO_DEBOUNCE_MS; status = gpiod_set_debounce(palmas_usb->id_gpiod, debounce * 1000); if (status < 0) palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce); } INIT_DELAYED_WORK(&palmas_usb->wq_detectid, palmas_gpio_id_detect); palmas->usb = palmas_usb; palmas_usb->palmas = palmas; palmas_usb->dev = &pdev->dev; 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; } status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev); if (status) { dev_err(&pdev->dev, "failed to register extcon device\n"); return status; } if (palmas_usb->enable_id_detection) { 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); 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, "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); return status; } } else if (palmas_usb->enable_gpio_id_detection) { palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod); if (palmas_usb->gpio_id_irq < 0) { dev_err(&pdev->dev, "failed to get id irq\n"); return palmas_usb->gpio_id_irq; } status = devm_request_threaded_irq(&pdev->dev, palmas_usb->gpio_id_irq, NULL, palmas_gpio_id_irq_handler, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "palmas_usb_id", palmas_usb); if (status < 0) { dev_err(&pdev->dev, "failed to request handler for id irq\n"); return status; } } if (palmas_usb->enable_vbus_detection) { 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); 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, "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); return status; } } else if (palmas_usb->enable_gpio_vbus_detection) { /* remux GPIO_1 as VBUSDET */ status = palmas_update_bits(palmas, PALMAS_PU_PD_OD_BASE, PALMAS_PRIMARY_SECONDARY_PAD1, PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK, (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT)); if (status < 0) { dev_err(&pdev->dev, "can't remux GPIO1\n"); return status; } palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data, PALMAS_VBUS_OTG_IRQ); palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod); if (palmas_usb->gpio_vbus_irq < 0) { dev_err(&pdev->dev, "failed to get vbus irq\n"); return palmas_usb->gpio_vbus_irq; } status = devm_request_threaded_irq(&pdev->dev, palmas_usb->gpio_vbus_irq, NULL, palmas_vbus_irq_handler, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT, "palmas_usb_vbus", palmas_usb); if (status < 0) { dev_err(&pdev->dev, "failed to request handler for vbus irq\n"); return status; } } palmas_enable_irq(palmas_usb); /* perform initial detection */ if (palmas_usb->enable_gpio_vbus_detection) palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb); palmas_gpio_id_detect(&palmas_usb->wq_detectid.work); 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); cancel_delayed_work_sync(&palmas_usb->wq_detectid); 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_gpio_vbus_detection) enable_irq_wake(palmas_usb->gpio_vbus_irq); if (palmas_usb->enable_id_detection) enable_irq_wake(palmas_usb->id_irq); if (palmas_usb->enable_gpio_id_detection) enable_irq_wake(palmas_usb->gpio_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_gpio_vbus_detection) disable_irq_wake(palmas_usb->gpio_vbus_irq); if (palmas_usb->enable_id_detection) disable_irq_wake(palmas_usb->id_irq); if (palmas_usb->enable_gpio_id_detection) disable_irq_wake(palmas_usb->gpio_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 <gg@slimlogic.co.uk>"); MODULE_DESCRIPTION("Palmas USB transceiver driver"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);