![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
207 lines
4.8 KiB
C
207 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* w1-gpio - GPIO w1 bus master driver
|
|
*
|
|
* Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/w1-gpio.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/w1.h>
|
|
|
|
static u8 w1_gpio_set_pullup(void *data, int delay)
|
|
{
|
|
struct w1_gpio_platform_data *pdata = data;
|
|
|
|
if (delay) {
|
|
pdata->pullup_duration = delay;
|
|
} else {
|
|
if (pdata->pullup_duration) {
|
|
/*
|
|
* This will OVERRIDE open drain emulation and force-pull
|
|
* the line high for some time.
|
|
*/
|
|
gpiod_set_raw_value(pdata->gpiod, 1);
|
|
msleep(pdata->pullup_duration);
|
|
/*
|
|
* This will simply set the line as input since we are doing
|
|
* open drain emulation in the GPIO library.
|
|
*/
|
|
gpiod_set_value(pdata->gpiod, 1);
|
|
}
|
|
pdata->pullup_duration = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void w1_gpio_write_bit(void *data, u8 bit)
|
|
{
|
|
struct w1_gpio_platform_data *pdata = data;
|
|
|
|
gpiod_set_value(pdata->gpiod, bit);
|
|
}
|
|
|
|
static u8 w1_gpio_read_bit(void *data)
|
|
{
|
|
struct w1_gpio_platform_data *pdata = data;
|
|
|
|
return gpiod_get_value(pdata->gpiod) ? 1 : 0;
|
|
}
|
|
|
|
#if defined(CONFIG_OF)
|
|
static const struct of_device_id w1_gpio_dt_ids[] = {
|
|
{ .compatible = "w1-gpio" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, w1_gpio_dt_ids);
|
|
#endif
|
|
|
|
static int w1_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct w1_bus_master *master;
|
|
struct w1_gpio_platform_data *pdata;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = dev->of_node;
|
|
/* Enforce open drain mode by default */
|
|
enum gpiod_flags gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
|
|
int err;
|
|
|
|
if (of_have_populated_dt()) {
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* This parameter means that something else than the gpiolib has
|
|
* already set the line into open drain mode, so we should just
|
|
* driver it high/low like we are in full control of the line and
|
|
* open drain will happen transparently.
|
|
*/
|
|
if (of_get_property(np, "linux,open-drain", NULL))
|
|
gflags = GPIOD_OUT_LOW;
|
|
|
|
pdev->dev.platform_data = pdata;
|
|
}
|
|
pdata = dev_get_platdata(dev);
|
|
|
|
if (!pdata) {
|
|
dev_err(dev, "No configuration data\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
master = devm_kzalloc(dev, sizeof(struct w1_bus_master),
|
|
GFP_KERNEL);
|
|
if (!master) {
|
|
dev_err(dev, "Out of memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pdata->gpiod = devm_gpiod_get_index(dev, NULL, 0, gflags);
|
|
if (IS_ERR(pdata->gpiod)) {
|
|
dev_err(dev, "gpio_request (pin) failed\n");
|
|
return PTR_ERR(pdata->gpiod);
|
|
}
|
|
|
|
pdata->pullup_gpiod =
|
|
devm_gpiod_get_index_optional(dev, NULL, 1, GPIOD_OUT_LOW);
|
|
if (IS_ERR(pdata->pullup_gpiod)) {
|
|
dev_err(dev, "gpio_request_one "
|
|
"(ext_pullup_enable_pin) failed\n");
|
|
return PTR_ERR(pdata->pullup_gpiod);
|
|
}
|
|
|
|
master->data = pdata;
|
|
master->read_bit = w1_gpio_read_bit;
|
|
gpiod_direction_output(pdata->gpiod, 1);
|
|
master->write_bit = w1_gpio_write_bit;
|
|
|
|
/*
|
|
* If we are using open drain emulation from the GPIO library,
|
|
* we need to use this pullup function that hammers the line
|
|
* high using a raw accessor to provide pull-up for the w1
|
|
* line.
|
|
*/
|
|
if (gflags == GPIOD_OUT_LOW_OPEN_DRAIN)
|
|
master->set_pullup = w1_gpio_set_pullup;
|
|
|
|
err = w1_add_master_device(master);
|
|
if (err) {
|
|
dev_err(dev, "w1_add_master device failed\n");
|
|
return err;
|
|
}
|
|
|
|
if (pdata->enable_external_pullup)
|
|
pdata->enable_external_pullup(1);
|
|
|
|
if (pdata->pullup_gpiod)
|
|
gpiod_set_value(pdata->pullup_gpiod, 1);
|
|
|
|
platform_set_drvdata(pdev, master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int w1_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct w1_bus_master *master = platform_get_drvdata(pdev);
|
|
struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
|
|
if (pdata->enable_external_pullup)
|
|
pdata->enable_external_pullup(0);
|
|
|
|
if (pdata->pullup_gpiod)
|
|
gpiod_set_value(pdata->pullup_gpiod, 0);
|
|
|
|
w1_remove_master_device(master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused w1_gpio_suspend(struct device *dev)
|
|
{
|
|
struct w1_gpio_platform_data *pdata = dev_get_platdata(dev);
|
|
|
|
if (pdata->enable_external_pullup)
|
|
pdata->enable_external_pullup(0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused w1_gpio_resume(struct device *dev)
|
|
{
|
|
struct w1_gpio_platform_data *pdata = dev_get_platdata(dev);
|
|
|
|
if (pdata->enable_external_pullup)
|
|
pdata->enable_external_pullup(1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(w1_gpio_pm_ops, w1_gpio_suspend, w1_gpio_resume);
|
|
|
|
static struct platform_driver w1_gpio_driver = {
|
|
.driver = {
|
|
.name = "w1-gpio",
|
|
.pm = &w1_gpio_pm_ops,
|
|
.of_match_table = of_match_ptr(w1_gpio_dt_ids),
|
|
},
|
|
.probe = w1_gpio_probe,
|
|
.remove = w1_gpio_remove,
|
|
};
|
|
|
|
module_platform_driver(w1_gpio_driver);
|
|
|
|
MODULE_DESCRIPTION("GPIO w1 bus master driver");
|
|
MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
|
|
MODULE_LICENSE("GPL");
|