[mirror_ubuntu-artful-kernel.git] / drivers / extcon / extcon-intel-int3496.c

/*
 * Intel INT3496 ACPI device extcon driver
 *
 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
 *
 * Based on android x86 kernel code which is:
 *
 * Copyright (c) 2014, Intel Corporation.
 * Author: David Cohen <david.a.cohen@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/acpi.h>
#include <linux/extcon.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#define INT3496_GPIO_USB_ID	0
#define INT3496_GPIO_VBUS_EN	1
#define INT3496_GPIO_USB_MUX	2
#define DEBOUNCE_TIME		msecs_to_jiffies(50)

struct int3496_data {
	struct device *dev;
	struct extcon_dev *edev;
	struct delayed_work work;
	struct gpio_desc *gpio_usb_id;
	struct gpio_desc *gpio_vbus_en;
	struct gpio_desc *gpio_usb_mux;
	int usb_id_irq;
};

static const unsigned int int3496_cable[] = {
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false };
static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false };
static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };

static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {
	{ "id-gpios", &id_gpios, 1 },
	{ "vbus-gpios", &vbus_gpios, 1 },
	{ "mux-gpios", &mux_gpios, 1 },
	{ },
};

static void int3496_do_usb_id(struct work_struct *work)
{
	struct int3496_data *data =
		container_of(work, struct int3496_data, work.work);
	int id = gpiod_get_value_cansleep(data->gpio_usb_id);

	/* id == 1: PERIPHERAL, id == 0: HOST */
	dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");

	/*
	 * Peripheral: set USB mux to peripheral and disable VBUS
	 * Host: set USB mux to host and enable VBUS
	 */
	if (!IS_ERR(data->gpio_usb_mux))
		gpiod_direction_output(data->gpio_usb_mux, id);

	if (!IS_ERR(data->gpio_vbus_en))
		gpiod_direction_output(data->gpio_vbus_en, !id);

	extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
}

static irqreturn_t int3496_thread_isr(int irq, void *priv)
{
	struct int3496_data *data = priv;

	/* Let the pin settle before processing it */
	mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);

	return IRQ_HANDLED;
}

static int int3496_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct int3496_data *data;
	int ret;

	ret = devm_acpi_dev_add_driver_gpios(dev, acpi_int3496_default_gpios);
	if (ret) {
		dev_err(dev, "can't add GPIO ACPI mapping\n");
		return ret;
	}

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->dev = dev;
	INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);

	data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN);
	if (IS_ERR(data->gpio_usb_id)) {
		ret = PTR_ERR(data->gpio_usb_id);
		dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
		return ret;
	} else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) {
		dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n");
		gpiod_direction_input(data->gpio_usb_id);
	}

	data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
	if (data->usb_id_irq < 0) {
		dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
		return data->usb_id_irq;
	}

	data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS);
	if (IS_ERR(data->gpio_vbus_en))
		dev_info(dev, "can't request VBUS EN GPIO\n");

	data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS);
	if (IS_ERR(data->gpio_usb_mux))
		dev_info(dev, "can't request USB MUX GPIO\n");

	/* register extcon device */
	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
	if (IS_ERR(data->edev))
		return -ENOMEM;

	ret = devm_extcon_dev_register(dev, data->edev);
	if (ret < 0) {
		dev_err(dev, "can't register extcon device: %d\n", ret);
		return ret;
	}

	ret = devm_request_threaded_irq(dev, data->usb_id_irq,
					NULL, int3496_thread_isr,
					IRQF_SHARED | IRQF_ONESHOT |
					IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING,
					dev_name(dev), data);
	if (ret < 0) {
		dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
		return ret;
	}

	/* queue initial processing of id-pin */
	queue_delayed_work(system_wq, &data->work, 0);

	platform_set_drvdata(pdev, data);

	return 0;
}

static int int3496_remove(struct platform_device *pdev)
{
	struct int3496_data *data = platform_get_drvdata(pdev);

	devm_free_irq(&pdev->dev, data->usb_id_irq, data);
	cancel_delayed_work_sync(&data->work);

	return 0;
}

static struct acpi_device_id int3496_acpi_match[] = {
	{ "INT3496" },
	{ }
};
MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);

static struct platform_driver int3496_driver = {
	.driver = {
		.name = "intel-int3496",
		.acpi_match_table = int3496_acpi_match,
	},
	.probe = int3496_probe,
	.remove = int3496_remove,
};

module_platform_driver(int3496_driver);

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
2f556bdb DC	1	/*
	2	* Intel INT3496 ACPI device extcon driver
	3	*
	4	* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
	5	*
	6	* Based on android x86 kernel code which is:
	7	*
	8	* Copyright (c) 2014, Intel Corporation.
	9	* Author: David Cohen <david.a.cohen@linux.intel.com>
	10	*
	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.
	14	*
	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.
	19	*/
	20
	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>
	27
	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)
	32
	33	struct int3496_data {
	34	struct device *dev;
	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;
	40	int usb_id_irq;
	41	};
	42
	43	static const unsigned int int3496_cable[] = {
	44	EXTCON_USB_HOST,
	45	EXTCON_NONE,
	46	};
	47
8cb2cbae AS	48	static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false };
	49	static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false };
	50	static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };
	51
	52	static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {
	53	{ "id-gpios", &id_gpios, 1 },
	54	{ "vbus-gpios", &vbus_gpios, 1 },
	55	{ "mux-gpios", &mux_gpios, 1 },
	56	{ },
	57	};
	58
2f556bdb DC	59	static void int3496_do_usb_id(struct work_struct *work)
	60	{
	61	struct int3496_data *data =
	62	container_of(work, struct int3496_data, work.work);
	63	int id = gpiod_get_value_cansleep(data->gpio_usb_id);
	64
	65	/* id == 1: PERIPHERAL, id == 0: HOST */
	66	dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");
	67
	68	/*
	69	* Peripheral: set USB mux to peripheral and disable VBUS
	70	* Host: set USB mux to host and enable VBUS
	71	*/
	72	if (!IS_ERR(data->gpio_usb_mux))
	73	gpiod_direction_output(data->gpio_usb_mux, id);
	74
	75	if (!IS_ERR(data->gpio_vbus_en))
	76	gpiod_direction_output(data->gpio_vbus_en, !id);
	77
	78	extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
	79	}
	80
	81	static irqreturn_t int3496_thread_isr(int irq, void *priv)
	82	{
	83	struct int3496_data *data = priv;
	84
	85	/* Let the pin settle before processing it */
	86	mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);
	87
	88	return IRQ_HANDLED;
	89	}
	90
	91	static int int3496_probe(struct platform_device *pdev)
	92	{
	93	struct device *dev = &pdev->dev;
	94	struct int3496_data *data;
	95	int ret;
	96
1f4be247	97	ret = devm_acpi_dev_add_driver_gpios(dev, acpi_int3496_default_gpios);
8cb2cbae AS	98	if (ret) {
	99	dev_err(dev, "can't add GPIO ACPI mapping\n");
	100	return ret;
	101	}
	102
2f556bdb DC	103	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	104	if (!data)
	105	return -ENOMEM;
	106
	107	data->dev = dev;
	108	INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);
	109
408c5b41	110	data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN);
2f556bdb DC	111	if (IS_ERR(data->gpio_usb_id)) {
	112	ret = PTR_ERR(data->gpio_usb_id);
	113	dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
	114	return ret;
70216fd9 HG	115	} else if (gpiod_get_direction(data->gpio_usb_id) != GPIOF_DIR_IN) {
	116	dev_warn(dev, FW_BUG "USB ID GPIO not in input mode, fixing\n");
	117	gpiod_direction_input(data->gpio_usb_id);
2f556bdb DC	118	}
	119
	120	data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
bafa687d	121	if (data->usb_id_irq < 0) {
2f556bdb	122	dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
bafa687d	123	return data->usb_id_irq;
2f556bdb DC	124	}
2f556bdb DC	125
408c5b41	126	data->gpio_vbus_en = devm_gpiod_get(dev, "vbus", GPIOD_ASIS);
2f556bdb DC	127	if (IS_ERR(data->gpio_vbus_en))
	128	dev_info(dev, "can't request VBUS EN GPIO\n");
	129
408c5b41	130	data->gpio_usb_mux = devm_gpiod_get(dev, "mux", GPIOD_ASIS);
2f556bdb DC	131	if (IS_ERR(data->gpio_usb_mux))
	132	dev_info(dev, "can't request USB MUX GPIO\n");
	133
	134	/* register extcon device */
	135	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
	136	if (IS_ERR(data->edev))
	137	return -ENOMEM;
	138
	139	ret = devm_extcon_dev_register(dev, data->edev);
	140	if (ret < 0) {
	141	dev_err(dev, "can't register extcon device: %d\n", ret);
	142	return ret;
	143	}
	144
	145	ret = devm_request_threaded_irq(dev, data->usb_id_irq,
	146	NULL, int3496_thread_isr,
	147	IRQF_SHARED \| IRQF_ONESHOT \|
	148	IRQF_TRIGGER_RISING \|
	149	IRQF_TRIGGER_FALLING,
	150	dev_name(dev), data);
	151	if (ret < 0) {
	152	dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
	153	return ret;
	154	}
	155
	156	/* queue initial processing of id-pin */
	157	queue_delayed_work(system_wq, &data->work, 0);
	158
	159	platform_set_drvdata(pdev, data);
	160
	161	return 0;
	162	}
	163
	164	static int int3496_remove(struct platform_device *pdev)
	165	{
	166	struct int3496_data *data = platform_get_drvdata(pdev);
	167
	168	devm_free_irq(&pdev->dev, data->usb_id_irq, data);
	169	cancel_delayed_work_sync(&data->work);
	170
	171	return 0;
	172	}
	173
	174	static struct acpi_device_id int3496_acpi_match[] = {
	175	{ "INT3496" },
	176	{ }
	177	};
	178	MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);
	179
	180	static struct platform_driver int3496_driver = {
	181	.driver = {
	182	.name = "intel-int3496",
	183	.acpi_match_table = int3496_acpi_match,
	184	},
	185	.probe = int3496_probe,
	186	.remove = int3496_remove,
	187	};
	188
	189	module_platform_driver(int3496_driver);
	190
	191	MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
	192	MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
	193	MODULE_LICENSE("GPL");