194 lines
5.2 KiB
C
194 lines
5.2 KiB
C
/*
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* Intel INT3496 ACPI device extcon driver
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*
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* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
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*
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* Based on android x86 kernel code which is:
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*
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* Copyright (c) 2014, Intel Corporation.
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* Author: David Cohen <david.a.cohen@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/extcon-provider.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#define INT3496_GPIO_USB_ID 0
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#define INT3496_GPIO_VBUS_EN 1
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#define INT3496_GPIO_USB_MUX 2
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#define DEBOUNCE_TIME msecs_to_jiffies(50)
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struct int3496_data {
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struct device *dev;
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struct extcon_dev *edev;
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struct delayed_work work;
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struct gpio_desc *gpio_usb_id;
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struct gpio_desc *gpio_vbus_en;
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struct gpio_desc *gpio_usb_mux;
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int usb_id_irq;
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};
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static const unsigned int int3496_cable[] = {
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false };
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static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false };
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static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };
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static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {
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{ "id-gpios", &id_gpios, 1 },
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{ "vbus-gpios", &vbus_gpios, 1 },
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{ "mux-gpios", &mux_gpios, 1 },
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{ },
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};
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static void int3496_do_usb_id(struct work_struct *work)
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{
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struct int3496_data *data =
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container_of(work, struct int3496_data, work.work);
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int id = gpiod_get_value_cansleep(data->gpio_usb_id);
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/* id == 1: PERIPHERAL, id == 0: HOST */
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dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");
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/*
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* Peripheral: set USB mux to peripheral and disable VBUS
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* Host: set USB mux to host and enable VBUS
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*/
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if (!IS_ERR(data->gpio_usb_mux))
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gpiod_direction_output(data->gpio_usb_mux, id);
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if (!IS_ERR(data->gpio_vbus_en))
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gpiod_direction_output(data->gpio_vbus_en, !id);
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extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
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}
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static irqreturn_t int3496_thread_isr(int irq, void *priv)
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{
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struct int3496_data *data = priv;
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/* Let the pin settle before processing it */
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mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);
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return IRQ_HANDLED;
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}
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static int int3496_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct int3496_data *data;
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int ret;
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ret = devm_acpi_dev_add_driver_gpios(dev, acpi_int3496_default_gpios);
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if (ret) {
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dev_err(dev, "can't add GPIO ACPI mapping\n");
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return ret;
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}
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->dev = dev;
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INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);
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data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN);
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if (IS_ERR(data->gpio_usb_id)) {
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ret = PTR_ERR(data->gpio_usb_id);
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dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
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return ret;
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} else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) {
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dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n");
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gpiod_direction_input(data->gpio_usb_id);
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}
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data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
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if (data->usb_id_irq < 0) {
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dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
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return data->usb_id_irq;
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}
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data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS);
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if (IS_ERR(data->gpio_vbus_en))
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dev_info(dev, "can't request VBUS EN GPIO\n");
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data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS);
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if (IS_ERR(data->gpio_usb_mux))
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dev_info(dev, "can't request USB MUX GPIO\n");
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/* register extcon device */
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data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
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if (IS_ERR(data->edev))
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return -ENOMEM;
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ret = devm_extcon_dev_register(dev, data->edev);
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if (ret < 0) {
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dev_err(dev, "can't register extcon device: %d\n", ret);
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return ret;
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}
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ret = devm_request_threaded_irq(dev, data->usb_id_irq,
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NULL, int3496_thread_isr,
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IRQF_SHARED | IRQF_ONESHOT |
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IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING,
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dev_name(dev), data);
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if (ret < 0) {
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dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
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return ret;
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}
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/* queue initial processing of id-pin */
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queue_delayed_work(system_wq, &data->work, 0);
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static int int3496_remove(struct platform_device *pdev)
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{
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struct int3496_data *data = platform_get_drvdata(pdev);
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devm_free_irq(&pdev->dev, data->usb_id_irq, data);
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cancel_delayed_work_sync(&data->work);
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return 0;
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}
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static const struct acpi_device_id int3496_acpi_match[] = {
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{ "INT3496" },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);
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static struct platform_driver int3496_driver = {
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.driver = {
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.name = "intel-int3496",
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.acpi_match_table = int3496_acpi_match,
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},
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.probe = int3496_probe,
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.remove = int3496_remove,
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};
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module_platform_driver(int3496_driver);
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
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MODULE_LICENSE("GPL");
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