2 * Intel INT3496 ACPI device extcon driver
4 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
6 * Based on android x86 kernel code which is:
8 * Copyright (c) 2014, Intel Corporation.
9 * Author: David Cohen <david.a.cohen@linux.intel.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
21 #include <linux/acpi.h>
22 #include <linux/extcon.h>
23 #include <linux/gpio.h>
24 #include <linux/interrupt.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
28 #define INT3496_GPIO_USB_ID 0
29 #define INT3496_GPIO_VBUS_EN 1
30 #define INT3496_GPIO_USB_MUX 2
31 #define DEBOUNCE_TIME msecs_to_jiffies(50)
35 struct extcon_dev *edev;
36 struct delayed_work work;
37 struct gpio_desc *gpio_usb_id;
38 struct gpio_desc *gpio_vbus_en;
39 struct gpio_desc *gpio_usb_mux;
43 static const unsigned int int3496_cable[] = {
48 static void int3496_do_usb_id(struct work_struct *work)
50 struct int3496_data *data =
51 container_of(work, struct int3496_data, work.work);
52 int id = gpiod_get_value_cansleep(data->gpio_usb_id);
54 /* id == 1: PERIPHERAL, id == 0: HOST */
55 dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");
58 * Peripheral: set USB mux to peripheral and disable VBUS
59 * Host: set USB mux to host and enable VBUS
61 if (!IS_ERR(data->gpio_usb_mux))
62 gpiod_direction_output(data->gpio_usb_mux, id);
64 if (!IS_ERR(data->gpio_vbus_en))
65 gpiod_direction_output(data->gpio_vbus_en, !id);
67 extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
70 static irqreturn_t int3496_thread_isr(int irq, void *priv)
72 struct int3496_data *data = priv;
74 /* Let the pin settle before processing it */
75 mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);
80 static int int3496_probe(struct platform_device *pdev)
82 struct device *dev = &pdev->dev;
83 struct int3496_data *data;
86 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
91 INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);
93 data->gpio_usb_id = devm_gpiod_get_index(dev, "id",
96 if (IS_ERR(data->gpio_usb_id)) {
97 ret = PTR_ERR(data->gpio_usb_id);
98 dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
102 data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
103 if (data->usb_id_irq <= 0) {
104 dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
108 data->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
109 INT3496_GPIO_VBUS_EN,
111 if (IS_ERR(data->gpio_vbus_en))
112 dev_info(dev, "can't request VBUS EN GPIO\n");
114 data->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
115 INT3496_GPIO_USB_MUX,
117 if (IS_ERR(data->gpio_usb_mux))
118 dev_info(dev, "can't request USB MUX GPIO\n");
120 /* register extcon device */
121 data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
122 if (IS_ERR(data->edev))
125 ret = devm_extcon_dev_register(dev, data->edev);
127 dev_err(dev, "can't register extcon device: %d\n", ret);
131 ret = devm_request_threaded_irq(dev, data->usb_id_irq,
132 NULL, int3496_thread_isr,
133 IRQF_SHARED | IRQF_ONESHOT |
134 IRQF_TRIGGER_RISING |
135 IRQF_TRIGGER_FALLING,
136 dev_name(dev), data);
138 dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
142 /* queue initial processing of id-pin */
143 queue_delayed_work(system_wq, &data->work, 0);
145 platform_set_drvdata(pdev, data);
150 static int int3496_remove(struct platform_device *pdev)
152 struct int3496_data *data = platform_get_drvdata(pdev);
154 devm_free_irq(&pdev->dev, data->usb_id_irq, data);
155 cancel_delayed_work_sync(&data->work);
160 static struct acpi_device_id int3496_acpi_match[] = {
164 MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);
166 static struct platform_driver int3496_driver = {
168 .name = "intel-int3496",
169 .acpi_match_table = int3496_acpi_match,
171 .probe = int3496_probe,
172 .remove = int3496_remove,
175 module_platform_driver(int3496_driver);
177 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
178 MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
179 MODULE_LICENSE("GPL");