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/*
* Copyright (C) 2016 Motorola Mobility LLC
*
* 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/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/fsusb42.h>
struct fsusb42_info {
struct gpio sel_gpio;
struct regulator *vdd;
bool vdd_enabled;
enum fsusb42_state state;
struct mutex lock;
struct device *dev;
};
static struct fsusb42_info *the_info;
static int fsusb42_vdd_enable(struct fsusb42_info *info, bool enable)
{
int rc = 0;
dev_dbg(info->dev, "reg (%s)\n", enable ? "HPM" : "LPM");
if ((enable && info->vdd_enabled) || (!enable && !info->vdd_enabled))
return 0;
if (enable) {
rc = regulator_enable(info->vdd);
} else {
rc = regulator_disable(info->vdd);
if (rc)
dev_err(info->dev, "Unable to enable vdd\n");
}
if (rc)
dev_err(info->dev, "Unable to %sable vdd\n",
enable ? "en" : "dis");
else
info->vdd_enabled = enable;
return rc;
}
enum fsusb42_state fsusb42_get_state(void)
{
struct fsusb42_info *info = the_info;
enum fsusb42_state state = FSUSB_OFF;
if (!info)
return state;
mutex_lock(&info->lock);
state = info->state;
mutex_unlock(&info->lock);
return state;
}
EXPORT_SYMBOL(fsusb42_get_state);
void fsusb42_set_state(enum fsusb42_state state)
{
struct fsusb42_info *info = the_info;
if (!info)
return;
dev_dbg(info->dev, "Set State to %d\n", state);
mutex_lock(&info->lock);
if (state == FSUSB_OFF) {
gpio_set_value(info->sel_gpio.gpio, 1);
fsusb42_vdd_enable(info, false);
} else {
fsusb42_vdd_enable(info, true);
if (state == FSUSB_STATE_USB)
gpio_set_value(info->sel_gpio.gpio, 0);
else
gpio_set_value(info->sel_gpio.gpio, 1);
}
info->state = state;
mutex_unlock(&info->lock);
}
EXPORT_SYMBOL(fsusb42_set_state);
static int fsusb42_probe(struct platform_device *pdev)
{
struct fsusb42_info *info;
int rc;
enum of_gpio_flags flags;
struct device_node *node = pdev->dev.of_node;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = &pdev->dev;
mutex_init(&info->lock);
info->sel_gpio.gpio = of_get_gpio_flags(node, 0, &flags);
info->sel_gpio.flags = flags;
of_property_read_string_index(node, "gpio-names", 0,
&info->sel_gpio.label);
rc = gpio_request_one(info->sel_gpio.gpio,
info->sel_gpio.flags,
info->sel_gpio.label);
if (rc) {
dev_err(info->dev, "failed to request sel GPIO\n");
goto fail;
}
rc = gpio_export(info->sel_gpio.gpio, 1);
if (rc)
dev_err(info->dev, "Failed to export sel GPIO %s: %d\n",
info->sel_gpio.label, info->sel_gpio.gpio);
rc = gpio_export_link(info->dev, info->sel_gpio.label,
info->sel_gpio.gpio);
if (rc)
dev_err(info->dev, "Failed to link sel GPIO %s: %d\n",
info->sel_gpio.label, info->sel_gpio.gpio);
info->vdd = devm_regulator_get(&pdev->dev, "vdd-fsusb42");
if (IS_ERR(info->vdd)) {
dev_err(info->dev, "unable to get vdd supply\n");
goto fail_gpio;
}
the_info = info;
return 0;
fail_gpio:
gpio_free(info->sel_gpio.gpio);
fail:
devm_kfree(&pdev->dev, info);
return rc;
}
static int fsusb42_remove(struct platform_device *pdev)
{
struct fsusb42_info *info = the_info;
if (info) {
gpio_free(info->sel_gpio.gpio);
fsusb42_vdd_enable(info, false);
devm_regulator_put(info->vdd);
devm_kfree(&pdev->dev, info);
the_info = NULL;
}
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id fsusb42_of_tbl[] = {
{ .compatible = "fairchild,fsusb42",
},
{},
};
#endif
static struct platform_driver fsusb42_driver = {
.probe = fsusb42_probe,
.remove = fsusb42_remove,
.driver = {
.name = "fsusb42",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(fsusb42_of_tbl),
},
};
static int __init fsusb42_init(void)
{
return platform_driver_register(&fsusb42_driver);
}
static void __exit fsusb42_exit(void)
{
platform_driver_unregister(&fsusb42_driver);
}
module_init(fsusb42_init);
module_exit(fsusb42_exit);
MODULE_ALIAS("platform:fsusb42");
MODULE_AUTHOR("Motorola Mobility LLC");
MODULE_DESCRIPTION("Motorola Mobility USB Mux");
MODULE_LICENSE("GPL");
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