linux/drivers/extcon/extcon-max3355.c

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// 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>
*/
extcon: Split out extcon header file for consumer and provider device The extcon has two type of extcon devices as following. - 'extcon provider deivce' adds new extcon device and detect the state/properties of external connector. Also, it notifies the state/properties to the extcon consumer device. - 'extcon consumer device' gets the change state/properties from extcon provider device. Prior to that, include/linux/extcon.h contains all exported API for both provider and consumer device driver. To clarify the meaning of header file and to remove the wrong use-case on consumer device, this patch separates into extcon.h and extcon-provider.h. [Description for include/linux/{extcon.h|extcon-provider.h}] - extcon.h includes the extcon API and data structure for extcon consumer device driver. This header file contains the following APIs: : Register/unregister the notifier to catch the change of extcon device : Get the extcon device instance : Get the extcon device name : Get the state of each external connector : Get the property value of each external connector : Get the property capability of each external connector - extcon-provider.h includes the extcon API and data structure for extcon provider device driver. This header file contains the following APIs: : Include 'include/linux/extcon.h' : Allocate the memory for extcon device instance : Register/unregister extcon device : Set the state of each external connector : Set the property value of each external connector : Set the property capability of each external connector Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk> Acked-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
2017-09-21 06:11:24 +03:00
#include <linux/extcon-provider.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 void max3355_remove(struct platform_device *pdev)
{
struct max3355_data *data = platform_get_drvdata(pdev);
gpiod_set_value_cansleep(data->shdn_gpiod, 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_new = 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");