From 578307282a9e47a9303de4fd55ed1bcdae995cbf Mon Sep 17 00:00:00 2001 From: Robert Baldyga Date: Tue, 10 Mar 2015 11:24:43 +0100 Subject: extcon: add extcon-odroid-usbotg driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch adds extcon driver for Odroid U3, U3+, X and XU3 boards. It recognizes type of USB cable connected to Odroid board basing on two signal lines VBUS_DET and OTG_ID (the second one is present only on Odroid U3+ board). Following table of states presents relationship between this signals and detected cable type: state | VBUS_DET | OTG_ID ------------------------------- USB | H | H USB-HOST | H | L disconn. | L | H USB-HOST | L | L This driver is based on extcon-gpio driver. Change-Id: I58d99a5681f99d79556123d4700d54dc836ee571 Signed-off-by: Łukasz Stelmach Signed-off-by: Robert Baldyga --- drivers/extcon/Kconfig | 4 + drivers/extcon/Makefile | 1 + drivers/extcon/extcon-odroid-usbotg.c | 264 ++++++++++++++++++++++++++++++++++ 3 files changed, 269 insertions(+) create mode 100644 drivers/extcon/extcon-odroid-usbotg.c diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index 75b286d3c9c..5eb7bb228d4 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig @@ -72,4 +72,8 @@ config EXTCON_PORT interface as old JACK driver to remove confusion of applying EXTCON to platform. +config EXTCON_ODROID_USBOTG + tristate "Extcon Odroid U3, U3+, X and XU USB OTG port" + depends on OF_GPIO + endif # MULTISTATE_SWITCH diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index b5a5ec1a5ec..917a68e0a8c 100644 --- a/drivers/extcon/Makefile +++ b/drivers/extcon/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o obj-$(CONFIG_EXTCON_PORT) += extcon-port.o +obj-$(CONFIG_EXTCON_ODROID_USBOTG) += extcon-odroid-usbotg.o diff --git a/drivers/extcon/extcon-odroid-usbotg.c b/drivers/extcon/extcon-odroid-usbotg.c new file mode 100644 index 00000000000..807366d5295 --- /dev/null +++ b/drivers/extcon/extcon-odroid-usbotg.c @@ -0,0 +1,264 @@ +/* + * drivers/extcon/extcon-odroid-usbotg.c + * + * USB cable extcon driver for Odroid U3, Odroid U3+ and Odroid X + * + * Copyright (C) 2014 Samsung Electronics + * Author: Lukasz Stelmach + * + * Modified by Robert Baldyga + * + * based on drivers/extcon/extcon-gpio.c + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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 +#include +#include +#include + +enum { + EXTCON_CABLE_USB = 0, + EXTCON_CABLE_USB_HOST, + + _EXTCON_CABLE_NUM, +}; + +static const char *odroid_usbotg_cable[] = { + [EXTCON_CABLE_USB] = "USB", + [EXTCON_CABLE_USB_HOST] = "USB-HOST", + + NULL, +}; + +struct odroid_usbotg_data { + struct extcon_dev *edev; + unsigned otg_id_gpio; + unsigned vbus_det_gpio; + int otg_id_irq; + int vbus_det_irq; + unsigned long debounce_ms; +}; + +/* + * state | VBUS_DET | OTG_ID + * ------------------------------- + * USB | H | H + * USB-HOST | H | L + * disconn. | L | H + * USB-HOST | L | L + * + * Only Odroid U3+ has OTG_ID line. U3 and X versions can detect only + * USB slave cable. + */ + +static void odroid_usbotg_detect_cable(struct odroid_usbotg_data *extcon_data) +{ + int state; + + mdelay(extcon_data->debounce_ms); + + if (extcon_data->otg_id_gpio) + state = (gpio_get_value(extcon_data->vbus_det_gpio) << 1) | + gpio_get_value(extcon_data->otg_id_gpio); + else + state = (gpio_get_value(extcon_data->vbus_det_gpio) << 1) | 1; + + dev_dbg(extcon_data->edev->dev, "cable state changed to %d\n", state); + + if (state & 0x1) + extcon_set_cable_state_(extcon_data->edev, + EXTCON_CABLE_USB_HOST, false); + if (state != 0x3) + extcon_set_cable_state_(extcon_data->edev, + EXTCON_CABLE_USB, false); + + if (!(state & 0x1)) + extcon_set_cable_state_(extcon_data->edev, + EXTCON_CABLE_USB_HOST, true); + else if (state == 0x3) + extcon_set_cable_state_(extcon_data->edev, + EXTCON_CABLE_USB, true); +} + +static irqreturn_t gpio_irq_handler(int irq, void *dev_id) +{ + struct odroid_usbotg_data *extcon_data = dev_id; + + odroid_usbotg_detect_cable(extcon_data); + + return IRQ_HANDLED; +} + +static int odroid_usbotg_parse_dt(struct platform_device *pdev, + struct odroid_usbotg_data *extcon_data) +{ + struct device_node *np = pdev->dev.of_node; + u32 val; + + if (!np) + return -ENODEV; + + extcon_data->edev->name = np->name; + extcon_data->vbus_det_gpio = of_get_named_gpio(np, "gpio-vbus-det", 0); + if (of_property_read_bool(np, "gpio-otg-id")) + extcon_data->otg_id_gpio = + of_get_named_gpio(np, "gpio-otg-id", 0); + + if (of_property_read_u32(np, "debounce", &val) != 0) + val = 50; + extcon_data->debounce_ms = val; + + return 0; +} + +static int odroid_usbotg_probe(struct platform_device *pdev) +{ + struct odroid_usbotg_data *extcon_data; + int ret = 0; + + extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct odroid_usbotg_data), + GFP_KERNEL); + if (!extcon_data) + return -ENOMEM; + + extcon_data->edev = devm_kzalloc(&pdev->dev, sizeof(struct extcon_dev), + GFP_KERNEL); + if (IS_ERR(extcon_data->edev)) { + dev_err(&pdev->dev, "failed to allocate extcon device\n"); + return -ENOMEM; + } + extcon_data->edev->supported_cable = odroid_usbotg_cable; + + ret = odroid_usbotg_parse_dt(pdev, extcon_data); + if (IS_ERR_VALUE(ret)) { + dev_err(&pdev->dev, "failed to get data from device tree\n"); + return ret; + } + + /* gpios */ + ret = devm_gpio_request_one(&pdev->dev, extcon_data->vbus_det_gpio, + GPIOF_DIR_IN, "usbotg_vbus_det"); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get vbus_det gpio\n"); + return ret; + } + ret = devm_gpio_request_one(&pdev->dev, extcon_data->otg_id_gpio, + GPIOF_DIR_IN, "usbotg_otg_id"); + if (ret < 0) + extcon_data->otg_id_gpio = 0; + + ret = extcon_dev_register(extcon_data->edev, &pdev->dev); + if (ret < 0) + return ret; + + /* irq */ + extcon_data->vbus_det_irq = gpio_to_irq(extcon_data->vbus_det_gpio); + if (extcon_data->vbus_det_irq < 0) { + dev_err(&pdev->dev, "failed to get irq from vbus_det\n"); + ret = extcon_data->vbus_det_irq; + goto err; + } + ret = request_threaded_irq(extcon_data->vbus_det_irq, NULL, + gpio_irq_handler, IRQF_ONESHOT | + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + pdev->name, extcon_data); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request vbus_det irq\n"); + goto err; + } + + if (extcon_data->otg_id_gpio) { + extcon_data->otg_id_irq = gpio_to_irq(extcon_data->otg_id_gpio); + if (extcon_data->otg_id_irq < 0) { + dev_err(&pdev->dev, "failed to get irq from otg_id\n"); + ret = extcon_data->otg_id_irq; + goto err; + } + ret = request_threaded_irq(extcon_data->otg_id_irq, NULL, + gpio_irq_handler, IRQF_ONESHOT | + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + pdev->name, extcon_data); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request otg_id irq\n"); + goto err; + } + } + + platform_set_drvdata(pdev, extcon_data); + /* Perform initial detection */ + odroid_usbotg_detect_cable(extcon_data); + + dev_dbg(&pdev->dev, "probe: success\n"); + + return 0; + +err: + extcon_dev_unregister(extcon_data->edev); + + return ret; +} + +static int odroid_usbotg_remove(struct platform_device *pdev) +{ + struct odroid_usbotg_data *extcon_data = platform_get_drvdata(pdev); + + free_irq(extcon_data->vbus_det_irq, extcon_data); + if (extcon_data->otg_id_gpio) + free_irq(extcon_data->otg_id_irq, extcon_data); + extcon_dev_unregister(extcon_data->edev); + + return 0; +} + +static const struct of_device_id odroid_usbotg_of_match[] = { + { .compatible = "extcon-odroid-usbotg" }, + { }, +}; +MODULE_DEVICE_TABLE(of, odroid_usbotg_of_match); + +static struct platform_driver odroid_usbotg_driver = { + .probe = odroid_usbotg_probe, + .remove = odroid_usbotg_remove, + .driver = { + .name = "odroid-usbotg", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(odroid_usbotg_of_match) + }, +}; + +static int __init odroid_usbotg_init(void) +{ + return platform_driver_register(&odroid_usbotg_driver); +} + +subsys_initcall(odroid_usbotg_init); + +static void __exit odroid_usbotg_cleanup(void) +{ + platform_driver_unregister(&odroid_usbotg_driver); +} + +module_exit(odroid_usbotg_cleanup); + +MODULE_AUTHOR("Lukasz Stelmach "); +MODULE_DESCRIPTION("USB OTG extcon driver for Odroid U3, U3+ and X"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3