[linux-2.6-block.git] / drivers / extcon / extcon-max3355.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Maxim Integrated MAX3355 USB OTG chip extcon driver
 *
 * Copyright (C)  2014-2015 Cogent Embedded, Inc.
 * Author: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
 */

#include <linux/extcon-provider.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>

struct max3355_data {
	struct extcon_dev *edev;
	struct gpio_desc *id_gpiod;
	struct gpio_desc *shdn_gpiod;
};

static const unsigned int max3355_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static irqreturn_t max3355_id_irq(int irq, void *dev_id)
{
	struct max3355_data *data = dev_id;
	int id = gpiod_get_value_cansleep(data->id_gpiod);

	if (id) {
		/*
		 * ID = 1 means USB HOST cable detached.
		 * As we don't have event for USB peripheral cable attached,
		 * we simulate USB peripheral attach here.
		 */
		extcon_set_state_sync(data->edev, EXTCON_USB_HOST, false);
		extcon_set_state_sync(data->edev, EXTCON_USB, true);
	} else {
		/*
		 * ID = 0 means USB HOST cable attached.
		 * As we don't have event for USB peripheral cable detached,
		 * we simulate USB peripheral detach here.
		 */
		extcon_set_state_sync(data->edev, EXTCON_USB, false);
		extcon_set_state_sync(data->edev, EXTCON_USB_HOST, true);
	}

	return IRQ_HANDLED;
}

static int max3355_probe(struct platform_device *pdev)
{
	struct max3355_data *data;
	struct gpio_desc *gpiod;
	int irq, err;

	data = devm_kzalloc(&pdev->dev, sizeof(struct max3355_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
	if (IS_ERR(gpiod)) {
		dev_err(&pdev->dev, "failed to get ID_OUT GPIO\n");
		return PTR_ERR(gpiod);
	}
	data->id_gpiod = gpiod;

	gpiod = devm_gpiod_get(&pdev->dev, "maxim,shdn", GPIOD_OUT_HIGH);
	if (IS_ERR(gpiod)) {
		dev_err(&pdev->dev, "failed to get SHDN# GPIO\n");
		return PTR_ERR(gpiod);
	}
	data->shdn_gpiod = gpiod;

	data->edev = devm_extcon_dev_allocate(&pdev->dev, max3355_cable);
	if (IS_ERR(data->edev)) {
		dev_err(&pdev->dev, "failed to allocate extcon device\n");
		return PTR_ERR(data->edev);
	}

	err = devm_extcon_dev_register(&pdev->dev, data->edev);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to register extcon device\n");
		return err;
	}

	irq = gpiod_to_irq(data->id_gpiod);
	if (irq < 0) {
		dev_err(&pdev->dev, "failed to translate ID_OUT GPIO to IRQ\n");
		return irq;
	}

	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, max3355_id_irq,
					IRQF_ONESHOT | IRQF_NO_SUSPEND |
					IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING,
					pdev->name, data);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to request ID_OUT IRQ\n");
		return err;
	}

	platform_set_drvdata(pdev, data);

	/* Perform initial detection */
	max3355_id_irq(irq, data);

	return 0;
}

static int max3355_remove(struct platform_device *pdev)
{
	struct max3355_data *data = platform_get_drvdata(pdev);

	gpiod_set_value_cansleep(data->shdn_gpiod, 0);

	return 0;
}

static const struct of_device_id max3355_match_table[] = {
	{ .compatible = "maxim,max3355", },
	{ }
};
MODULE_DEVICE_TABLE(of, max3355_match_table);

static struct platform_driver max3355_driver = {
	.probe		= max3355_probe,
	.remove		= max3355_remove,
	.driver		= {
		.name	= "extcon-max3355",
		.of_match_table = max3355_match_table,
	},
};

module_platform_driver(max3355_driver);

MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");
MODULE_DESCRIPTION("Maxim MAX3355 extcon driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
ac1dc6b2	1	// SPDX-License-Identifier: GPL-2.0-only
08a0a4f9 SS	2	/*
	3	* Maxim Integrated MAX3355 USB OTG chip extcon driver
	4	*
	5	* Copyright (C) 2014-2015 Cogent Embedded, Inc.
	6	* Author: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
08a0a4f9 SS	7	*/
08a0a4f9 SS	8
176aa360	9	#include <linux/extcon-provider.h>
08a0a4f9 SS	10	#include <linux/gpio.h>
	11	#include <linux/gpio/consumer.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/module.h>
c9c159b2	14	#include <linux/mod_devicetable.h>
08a0a4f9 SS	15	#include <linux/platform_device.h>
	16
	17	struct max3355_data {
	18	struct extcon_dev *edev;
	19	struct gpio_desc *id_gpiod;
	20	struct gpio_desc *shdn_gpiod;
	21	};
	22
	23	static const unsigned int max3355_cable[] = {
	24	EXTCON_USB,
	25	EXTCON_USB_HOST,
	26	EXTCON_NONE,
	27	};
	28
	29	static irqreturn_t max3355_id_irq(int irq, void *dev_id)
	30	{
	31	struct max3355_data *data = dev_id;
	32	int id = gpiod_get_value_cansleep(data->id_gpiod);
	33
	34	if (id) {
	35	/*
	36	* ID = 1 means USB HOST cable detached.
	37	* As we don't have event for USB peripheral cable attached,
	38	* we simulate USB peripheral attach here.
	39	*/
8670b459 CC	40	extcon_set_state_sync(data->edev, EXTCON_USB_HOST, false);
8670b459 CC	41	extcon_set_state_sync(data->edev, EXTCON_USB, true);
08a0a4f9 SS	42	} else {
	43	/*
	44	* ID = 0 means USB HOST cable attached.
	45	* As we don't have event for USB peripheral cable detached,
	46	* we simulate USB peripheral detach here.
	47	*/
8670b459 CC	48	extcon_set_state_sync(data->edev, EXTCON_USB, false);
8670b459 CC	49	extcon_set_state_sync(data->edev, EXTCON_USB_HOST, true);
08a0a4f9 SS	50	}
	51
	52	return IRQ_HANDLED;
	53	}
	54
	55	static int max3355_probe(struct platform_device *pdev)
	56	{
	57	struct max3355_data *data;
	58	struct gpio_desc *gpiod;
	59	int irq, err;
	60
	61	data = devm_kzalloc(&pdev->dev, sizeof(struct max3355_data),
	62	GFP_KERNEL);
	63	if (!data)
	64	return -ENOMEM;
	65
	66	gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
	67	if (IS_ERR(gpiod)) {
	68	dev_err(&pdev->dev, "failed to get ID_OUT GPIO\n");
	69	return PTR_ERR(gpiod);
	70	}
	71	data->id_gpiod = gpiod;
	72
	73	gpiod = devm_gpiod_get(&pdev->dev, "maxim,shdn", GPIOD_OUT_HIGH);
	74	if (IS_ERR(gpiod)) {
	75	dev_err(&pdev->dev, "failed to get SHDN# GPIO\n");
	76	return PTR_ERR(gpiod);
	77	}
	78	data->shdn_gpiod = gpiod;
	79
	80	data->edev = devm_extcon_dev_allocate(&pdev->dev, max3355_cable);
	81	if (IS_ERR(data->edev)) {
	82	dev_err(&pdev->dev, "failed to allocate extcon device\n");
	83	return PTR_ERR(data->edev);
	84	}
	85
	86	err = devm_extcon_dev_register(&pdev->dev, data->edev);
	87	if (err < 0) {
	88	dev_err(&pdev->dev, "failed to register extcon device\n");
	89	return err;
	90	}
	91
	92	irq = gpiod_to_irq(data->id_gpiod);
	93	if (irq < 0) {
	94	dev_err(&pdev->dev, "failed to translate ID_OUT GPIO to IRQ\n");
	95	return irq;
	96	}
	97
	98	err = devm_request_threaded_irq(&pdev->dev, irq, NULL, max3355_id_irq,
	99	IRQF_ONESHOT \| IRQF_NO_SUSPEND \|
	100	IRQF_TRIGGER_RISING \|
	101	IRQF_TRIGGER_FALLING,
	102	pdev->name, data);
	103	if (err < 0) {
	104	dev_err(&pdev->dev, "failed to request ID_OUT IRQ\n");
	105	return err;
	106	}
	107
	108	platform_set_drvdata(pdev, data);
	109
	110	/* Perform initial detection */
	111	max3355_id_irq(irq, data);
	112
	113	return 0;
114	}
115
116	static int max3355_remove(struct platform_device *pdev)
117	{
118	struct max3355_data *data = platform_get_drvdata(pdev);
119
120	gpiod_set_value_cansleep(data->shdn_gpiod, 0);
121
122	return 0;
123	}
124
125	static const struct of_device_id max3355_match_table[] = {
126	{ .compatible = "maxim,max3355", },
127	{ }
128	};
129	MODULE_DEVICE_TABLE(of, max3355_match_table);
130
131	static struct platform_driver max3355_driver = {
132	.probe = max3355_probe,
133	.remove = max3355_remove,
134	.driver = {
135	.name = "extcon-max3355",
136	.of_match_table = max3355_match_table,
137	},
138	};
139
140	module_platform_driver(max3355_driver);
141
142	MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");
143	MODULE_DESCRIPTION("Maxim MAX3355 extcon driver");
144	MODULE_LICENSE("GPL v2");