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/*
* Copyright (c) 2011, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rfkill.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/of_gpio.h>
#include <linux/rfkill-gpio.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
struct rfkill_gpio_data {
const char *name;
enum rfkill_type type;
int reset_gpio;
int shutdown_gpio;
int wake_gpio;
int host_wake_gpio;
struct rfkill *rfkill_dev;
char *reset_name;
char *shutdown_name;
char *wake_name;
char *host_wake_name;
struct clk *clk;
bool clk_enabled;
int irq;
};
static int rfkill_gpio_set_power(void *data, bool blocked)
{
struct rfkill_gpio_data *rfkill = data;
if (blocked) {
if (gpio_is_valid(rfkill->shutdown_gpio))
gpio_set_value(rfkill->shutdown_gpio, 0);
if (gpio_is_valid(rfkill->reset_gpio))
gpio_set_value(rfkill->reset_gpio, 0);
if (gpio_is_valid(rfkill->wake_gpio))
gpio_set_value(rfkill->wake_gpio, 0);
if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled)
clk_disable_unprepare(rfkill->clk);
} else {
if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
clk_prepare_enable(rfkill->clk);
if (gpio_is_valid(rfkill->wake_gpio))
gpio_set_value(rfkill->wake_gpio, 1);
if (gpio_is_valid(rfkill->reset_gpio))
gpio_set_value(rfkill->reset_gpio, 1);
if (gpio_is_valid(rfkill->shutdown_gpio))
gpio_set_value(rfkill->shutdown_gpio, 1);
}
rfkill->clk_enabled = !blocked;
return 0;
}
static const struct rfkill_ops rfkill_gpio_ops = {
.set_block = rfkill_gpio_set_power,
};
static int rfkill_gpio_dt_probe(struct device *dev,
struct rfkill_gpio_data *rfkill)
{
struct device_node * np = dev->of_node;
rfkill->name = np->name;
of_property_read_string(np, "rfkill-name", &rfkill->name);
of_property_read_u32(np, "rfkill-type", &rfkill->type);
rfkill->shutdown_gpio = of_get_named_gpio(np, "shutdown-gpio", 0);
rfkill->wake_gpio = of_get_named_gpio(np, "wake-gpio", 0);
rfkill->host_wake_gpio = of_get_named_gpio(np, "host-wake-gpio", 0);
rfkill->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
return 0;
}
static irqreturn_t rfkill_gpio_irq_handler(int irq, void *data)
{
struct rfkill_gpio_data *rfkill = data;
int host_wake;
unsigned int type;
host_wake = gpio_get_value(rfkill->host_wake_gpio);
type = (host_wake ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH) |
IRQF_NO_SUSPEND;
irq_set_irq_type(rfkill->irq, type);
return IRQ_HANDLED;
}
static int rfkill_gpio_probe(struct platform_device *pdev)
{
struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
struct rfkill_gpio_data *rfkill;
const char *clk_name = NULL;
int ret = 0;
int len = 0;
rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
if (!rfkill)
return -ENOMEM;
if (&pdev->dev.of_node) {
ret = rfkill_gpio_dt_probe(&pdev->dev, rfkill);
if (ret)
return ret;
} else if (pdata) {
clk_name = pdata->power_clk_name;
rfkill->name = pdata->name;
rfkill->type = pdata->type;
rfkill->reset_gpio = pdata->reset_gpio;
rfkill->shutdown_gpio = pdata->shutdown_gpio;
} else {
return -ENODEV;
}
/* make sure at-least one of the GPIO is defined and that
* a name is specified for this instance */
if ((!gpio_is_valid(rfkill->reset_gpio) &&
!gpio_is_valid(rfkill->shutdown_gpio)) || !rfkill->name) {
pr_warn("%s: invalid platform data\n", __func__);
return -EINVAL;
}
if (pdata && pdata->gpio_runtime_setup) {
ret = pdata->gpio_runtime_setup(pdev);
if (ret) {
pr_warn("%s: can't set up gpio\n", __func__);
return ret;
}
}
len = strlen(rfkill->name);
rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL);
if (!rfkill->reset_name)
return -ENOMEM;
rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL);
if (!rfkill->shutdown_name)
return -ENOMEM;
snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name);
snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name);
rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
if (gpio_is_valid(rfkill->reset_gpio)) {
ret = devm_gpio_request_one(&pdev->dev, rfkill->reset_gpio,
0, rfkill->reset_name);
if (ret) {
pr_warn("%s: failed to get reset gpio.\n", __func__);
return ret;
}
}
if (gpio_is_valid(rfkill->shutdown_gpio)) {
ret = devm_gpio_request_one(&pdev->dev, rfkill->shutdown_gpio,
0, rfkill->shutdown_name);
if (ret) {
pr_warn("%s: failed to get shutdown gpio.\n", __func__);
return ret;
}
}
if (gpio_is_valid(rfkill->wake_gpio)) {
ret = devm_gpio_request_one(&pdev->dev, rfkill->wake_gpio,
0, rfkill->wake_name);
if (ret) {
pr_warn("%s: failed to get wake gpio.\n", __func__);
return ret;
}
}
if (gpio_is_valid(rfkill->host_wake_gpio)) {
ret = devm_gpio_request_one(&pdev->dev, rfkill->host_wake_gpio,
1, rfkill->host_wake_name);
if (ret) {
pr_warn("%s: failed to get host wake gpio.\n",
__func__);
return ret;
}
rfkill->irq = gpio_to_irq(rfkill->host_wake_gpio);
ret = devm_request_irq(&pdev->dev, rfkill->irq,
rfkill_gpio_irq_handler,
IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND,
"rfkill-gpio-irq", rfkill);
if (ret) {
pr_warn("%s: failed to request IRQ(%d) ret(%d)\n",
__func__, rfkill->irq, ret);
return ret;
}
ret = irq_set_irq_wake(rfkill->irq, 1);
if (ret)
return ret;
}
rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
rfkill->type, &rfkill_gpio_ops,
rfkill);
if (!rfkill->rfkill_dev)
return -ENOMEM;
rfkill_init_sw_state(rfkill->rfkill_dev, false);
ret = rfkill_register(rfkill->rfkill_dev);
if (ret < 0)
return ret;
platform_set_drvdata(pdev, rfkill);
rfkill_set_sw_state(rfkill->rfkill_dev, true);
device_init_wakeup(&pdev->dev, true);
dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
return 0;
}
static int rfkill_gpio_remove(struct platform_device *pdev)
{
struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
if (pdata && pdata->gpio_runtime_close)
pdata->gpio_runtime_close(pdev);
rfkill_unregister(rfkill->rfkill_dev);
rfkill_destroy(rfkill->rfkill_dev);
return 0;
}
#ifdef CONFIG_PM
static int rfkill_gpio_suspend(struct device *dev)
{
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
if (device_may_wakeup(dev))
enable_irq_wake(rfkill->irq);
return 0;
}
static int rfkill_gpio_resume(struct device *dev)
{
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
if (device_may_wakeup(dev))
disable_irq_wake(rfkill->irq);
return 0;
}
#else
#define rfkill_gpio_suspend NULL
#define rfkill_gpio_resume NULL
#endif /* CONFIG_PM */
const struct dev_pm_ops rfkill_gpio_pm = {
.suspend = rfkill_gpio_suspend,
.resume = rfkill_gpio_resume,
};
static const struct of_device_id rfkill_of_match[] = {
{ .compatible = "rfkill-gpio", },
{},
};
static struct platform_driver rfkill_gpio_driver = {
.probe = rfkill_gpio_probe,
.remove = rfkill_gpio_remove,
.driver = {
.name = "rfkill_gpio",
.owner = THIS_MODULE,
.pm = &rfkill_gpio_pm,
.of_match_table = of_match_ptr(rfkill_of_match),
},
};
module_platform_driver(rfkill_gpio_driver);
MODULE_DESCRIPTION("gpio rfkill");
MODULE_AUTHOR("NVIDIA");
MODULE_LICENSE("GPL");
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