| /* |
| * 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_state_sync(edev, EXTCON_USB, true); |
| dev_dbg(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_state_sync(edev, EXTCON_USB, false); |
| dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, true); |
| dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, false); |
| dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, false); |
| dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, true); |
| dev_dbg(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_state_sync(edev, EXTCON_USB_HOST, false); |
| dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n"); |
| } else { |
| extcon_set_state_sync(edev, EXTCON_USB_HOST, true); |
| dev_dbg(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; |
| |
| if (!palmas) { |
| dev_err(&pdev->dev, "failed to get valid parent\n"); |
| return -EINVAL; |
| } |
| |
| 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); |
| } |
| |
| /* check if GPIO states changed while suspend/resume */ |
| 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); |
| |
| 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); |