| /* |
| * 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. |
| * |
| * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. |
| * |
| * Author: Graeme Gregory <gg@slimlogic.co.uk> |
| * Author: Kishon Vijay Abraham I <kishon@ti.com> |
| * Author: Laxman Dewangan <ldewangan@nvidia.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/err.h> |
| #include <linux/extcon.h> |
| #include <linux/mfd/palmas.h> |
| #include <linux/of.h> |
| #include <linux/of_platform.h> |
| #include <linux/sched.h> |
| #include <linux/workqueue.h> |
| |
| enum palmas_usb_cable_id { |
| USB_CABLE_INIT, |
| USB_CABLE_VBUS, |
| USB_CABLE_ID_GND, |
| USB_CABLE_ID_A, |
| USB_CABLE_ID_B, |
| USB_CABLE_ID_C, |
| USB_CABLE_ID_FLOAT, |
| }; |
| |
| static const char *const palmas_extcon_cable[] = { |
| [0] = "USB", |
| [1] = "USB-Host", |
| [2] = "USB-ID-A", |
| [3] = "USB-ID-B", |
| [4] = "USB-ID-C", |
| 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 void palmas_usb_id_int_set(struct palmas_usb *palmas_usb) |
| { |
| unsigned int all_int; |
| |
| all_int = PALMAS_USB_ID_INT_SRC_ID_GND | |
| PALMAS_USB_ID_INT_SRC_ID_A | |
| PALMAS_USB_ID_INT_SRC_ID_B | |
| PALMAS_USB_ID_INT_SRC_ID_C | |
| PALMAS_USB_ID_INT_SRC_ID_FLOAT; |
| if (palmas_usb->id_linkstat == PALMAS_USB_STATE_ID_FLOAT) { |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_EN_HI_SET, all_int); |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_EN_LO_CLR, all_int); |
| } else { |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_EN_HI_CLR, all_int); |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_EN_HI_SET, |
| PALMAS_USB_ID_INT_SRC_ID_FLOAT); |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_EN_LO_CLR, all_int); |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_EN_LO_SET, |
| all_int ^ PALMAS_USB_ID_INT_SRC_ID_FLOAT); |
| } |
| } |
| |
| static int palmas_usb_id_state_update(struct palmas_usb *palmas_usb) |
| { |
| unsigned int id_src; |
| int ret; |
| int new_state; |
| int new_cable_index; |
| int retry = 5; |
| unsigned int line_state; |
| |
| src_again: |
| ret = palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_SRC, &id_src); |
| if (ret < 0) { |
| dev_err(palmas_usb->dev, "ID_INT_SRC read failed: %d\n", ret); |
| return ret; |
| } |
| |
| dev_info(palmas_usb->dev, "id-state: 0x%02x\n", id_src); |
| if (!id_src) { |
| dev_err(palmas_usb->dev, "Improper ID state found\n"); |
| if (retry--) { |
| msleep(200); |
| goto src_again; |
| } |
| return -EAGAIN; |
| } |
| |
| /* If two ID states shows sign then allow for debauncing to settled. */ |
| if (id_src & (id_src - 1)) { |
| dev_info(palmas_usb->dev, |
| "ID states are not settled, try later\n"); |
| return -EAGAIN; |
| } |
| |
| if (id_src & PALMAS_USB_ID_INT_SRC_ID_GND) { |
| new_state = PALMAS_USB_STATE_ID_GND; |
| new_cable_index = 1; |
| } else if (id_src & PALMAS_USB_ID_INT_SRC_ID_A) { |
| new_state = PALMAS_USB_STATE_ID_A; |
| new_cable_index = 2; |
| } else if (id_src & PALMAS_USB_ID_INT_SRC_ID_B) { |
| new_state = PALMAS_USB_STATE_ID_B; |
| new_cable_index = 3; |
| } else if (id_src & PALMAS_USB_ID_INT_SRC_ID_C) { |
| new_state = PALMAS_USB_STATE_ID_C; |
| new_cable_index = 4; |
| } else if (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT) { |
| new_state = PALMAS_USB_STATE_ID_FLOAT; |
| new_cable_index = -1; |
| } else { |
| dev_info(palmas_usb->dev, "ID_SRC is not valid\n"); |
| new_state = PALMAS_USB_STATE_ID_FLOAT; |
| new_cable_index = 0; |
| } |
| |
| ret = palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE, |
| PALMAS_INT3_LINE_STATE, &line_state); |
| if (ret < 0) { |
| dev_err(palmas_usb->dev, |
| "INT3_LINE_STATE read failed: %d\n", ret); |
| return ret; |
| } |
| |
| /* Reconfirm the state by Line State */ |
| if (line_state & PALMAS_INT3_LINE_STATE_ID) { |
| if (new_state == PALMAS_USB_STATE_ID_FLOAT) { |
| new_state = PALMAS_USB_STATE_ID_GND; |
| new_cable_index = 1; |
| } |
| } else { |
| if (new_state != PALMAS_USB_STATE_ID_FLOAT) { |
| new_state = PALMAS_USB_STATE_ID_FLOAT; |
| new_cable_index = 0; |
| } |
| } |
| |
| if (palmas_usb->id_linkstat == new_state) { |
| dev_info(palmas_usb->dev, |
| "No change in ID state: Old %d and New %d\n", |
| palmas_usb->id_linkstat, new_state); |
| palmas_usb_id_int_set(palmas_usb); |
| return 0; |
| } |
| |
| if (palmas_usb->cur_cable_index > 0) { |
| dev_info(palmas_usb->dev, "Cable %s detached\n", |
| palmas_extcon_cable[palmas_usb->cur_cable_index]); |
| extcon_set_cable_state(&palmas_usb->edev, |
| palmas_extcon_cable[palmas_usb->cur_cable_index], |
| false); |
| } |
| |
| if ((new_cable_index < 0) && (!palmas_usb->cur_cable_index)) { |
| dev_info(palmas_usb->dev, "All cable detached\n"); |
| extcon_set_cable_state(&palmas_usb->edev, |
| palmas_extcon_cable[1], false); |
| extcon_set_cable_state(&palmas_usb->edev, |
| palmas_extcon_cable[2], false); |
| extcon_set_cable_state(&palmas_usb->edev, |
| palmas_extcon_cable[3], false); |
| extcon_set_cable_state(&palmas_usb->edev, |
| palmas_extcon_cable[4], false); |
| } |
| |
| palmas_usb->cur_cable_index = new_cable_index; |
| palmas_usb->id_linkstat = new_state; |
| if (palmas_usb->cur_cable_index <= 0) |
| goto end; |
| |
| dev_info(palmas_usb->dev, "Cable %s attached\n", |
| palmas_extcon_cable[palmas_usb->cur_cable_index]); |
| extcon_set_cable_state(&palmas_usb->edev, |
| palmas_extcon_cable[palmas_usb->cur_cable_index], true); |
| |
| end: |
| palmas_usb_id_int_set(palmas_usb); |
| return 0; |
| } |
| |
| static void palmas_usb_id_st_wq(struct work_struct *work) |
| { |
| struct palmas_usb *palmas_usb; |
| int ret; |
| |
| palmas_usb = container_of(work, struct palmas_usb, |
| cable_update_wq.work); |
| ret = palmas_usb_id_state_update(palmas_usb); |
| if (ret == -EAGAIN) |
| schedule_delayed_work(&palmas_usb->cable_update_wq, |
| msecs_to_jiffies(palmas_usb->cable_debaunce_time)); |
| } |
| |
| |
| 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); |
| |
| dev_info(palmas_usb->dev, "vbus-irq() INT3_LINE_STATE 0x%02x\n", |
| vbus_line_state); |
| if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) { |
| if (palmas_usb->vbus_linkstat != PALMAS_USB_STATE_VBUS) { |
| palmas_usb->vbus_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_info(palmas_usb->dev, |
| "Spurious connect event detected\n"); |
| } |
| } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) { |
| if (palmas_usb->vbus_linkstat == PALMAS_USB_STATE_VBUS) { |
| palmas_usb->vbus_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_info(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; |
| struct palmas_usb *palmas_usb = _palmas_usb; |
| |
| palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_LATCH_SET, &set); |
| |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_INT_LATCH_CLR, set); |
| |
| schedule_delayed_work(&palmas_usb->cable_update_wq, |
| msecs_to_jiffies(palmas_usb->cable_debaunce_time)); |
| return IRQ_HANDLED; |
| } |
| |
| static void palmas_enable_irq(struct palmas_usb *palmas_usb) |
| { |
| int ret; |
| |
| palmas_usb->vbus_linkstat = PALMAS_USB_STATE_INIT; |
| palmas_usb->id_linkstat = PALMAS_USB_STATE_INIT; |
| 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_CLEAR, PALMAS_USB_ID_CTRL_SET_ID_SRC_5U); |
| palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE, |
| PALMAS_USB_ID_CTRL_SET, PALMAS_USB_ID_CTRL_SET_ID_SRC_16U | |
| PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP); |
| |
| if (palmas_usb->enable_vbus_detection) |
| palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb); |
| |
| if (palmas_usb->enable_id_detection) { |
| /* Wait for the comparator to update status */ |
| msleep(palmas_usb->cable_debaunce_time); |
| ret = palmas_usb_id_state_update(palmas_usb); |
| if (ret == -EAGAIN) |
| schedule_delayed_work(&palmas_usb->cable_update_wq, |
| msecs_to_jiffies(palmas_usb->cable_debaunce_time)); |
| } |
| } |
| |
| static int palmas_usb_probe(struct platform_device *pdev) |
| { |
| struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); |
| struct palmas_platform_data *pdata; |
| struct palmas_extcon_platform_data *epdata = NULL; |
| 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; |
| |
| pdata = dev_get_platdata(pdev->dev.parent); |
| if (pdata) |
| epdata = pdata->extcon_pdata; |
| |
| if (node && !epdata) { |
| 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 (epdata) { |
| palmas_usb->wakeup = epdata->wakeup; |
| palmas_usb->enable_id_detection = |
| epdata->enable_id_pin_detection; |
| palmas_usb->enable_vbus_detection = |
| epdata->enable_vbus_detection; |
| if (palmas_usb->enable_id_detection) |
| palmas_usb->wakeup = true; |
| } |
| } |
| |
| palmas_usb->palmas = palmas; |
| palmas_usb->dev = &pdev->dev; |
| palmas_usb->cable_debaunce_time = 300; |
| |
| palmas_usb->id_otg_irq = palmas_irq_get_virq(palmas, PALMAS_ID_OTG_IRQ); |
| palmas_usb->id_irq = palmas_irq_get_virq(palmas, PALMAS_ID_IRQ); |
| palmas_usb->vbus_otg_irq = palmas_irq_get_virq(palmas, |
| PALMAS_VBUS_OTG_IRQ); |
| palmas_usb->vbus_irq = palmas_irq_get_virq(palmas, 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.mutually_exclusive = mutually_exclusive; |
| palmas_usb->edev.name = (epdata && epdata->connection_name) ? |
| epdata->connection_name : pdev->name; |
| |
| status = extcon_dev_register(&palmas_usb->edev, palmas_usb->dev); |
| if (status < 0) { |
| dev_err(&pdev->dev, "failed to register extcon device\n"); |
| 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; |
| } |
| status = devm_request_threaded_irq(palmas_usb->dev, |
| palmas_usb->id_otg_irq, |
| NULL, palmas_id_irq_handler, |
| IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
| IRQF_ONESHOT | IRQF_EARLY_RESUME, |
| "palmas_usb_id-otg", 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; |
| } |
| INIT_DELAYED_WORK(&palmas_usb->cable_update_wq, |
| palmas_usb_id_st_wq); |
| } |
| |
| 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); |
| if (palmas_usb->enable_id_detection) |
| cancel_delayed_work(&palmas_usb->cable_update_wq); |
| |
| 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); |
| |
| if (palmas_usb->enable_id_detection) |
| cancel_delayed_work(&palmas_usb->cable_update_wq); |
| 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 const struct dev_pm_ops palmas_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(palmas_usb_suspend, |
| palmas_usb_resume) |
| }; |
| |
| static struct of_device_id of_palmas_match_tbl[] = { |
| { .compatible = "ti,palmas-usb", }, |
| { .compatible = "ti,twl6035-usb", }, |
| { /* 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, |
| }, |
| }; |
| |
| static int __init palmas_usb_driver_init(void) |
| { |
| return platform_driver_register(&palmas_usb_driver); |
| } |
| subsys_initcall_sync(palmas_usb_driver_init); |
| |
| static void __exit palmas_usb_driver_exit(void) |
| { |
| platform_driver_unregister(&palmas_usb_driver); |
| } |
| module_exit(palmas_usb_driver_exit); |
| |
| 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); |