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/*
* Copyright (C) 2012-2014 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* 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.
*/
/*!
* @file mx6_bt_rfkill.c
*
* @brief This driver is implement a rfkill control interface of bluetooth
* chip on i.MX serial boards. Register the power regulator function and
* reset function in platform data.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/rfkill.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
#include <linux/gpio.h>
static int system_in_suspend;
struct mxc_bt_rfkill_data {
int bt_power_gpio;
};
struct mxc_bt_rfkill_pdata {
};
static void mxc_bt_rfkill_reset(void *rfkdata)
{
struct mxc_bt_rfkill_data *data = rfkdata;
printk(KERN_INFO "mxc_bt_rfkill_reset\n");
if (gpio_is_valid(data->bt_power_gpio)) {
mdelay(500);
gpio_set_value(data->bt_power_gpio, 0);
mdelay(500);
gpio_set_value(data->bt_power_gpio, 1);
mdelay(500);
}
}
static int mxc_bt_rfkill_power_change(void *rfkdata, int status)
{
if (status)
mxc_bt_rfkill_reset(rfkdata);
return 0;
}
static int mxc_bt_set_block(void *rfkdata, bool blocked)
{
int ret;
/* Bluetooth stack will reset the bluetooth chip during
* resume, since we keep bluetooth's power during suspend,
* don't let rfkill to actually reset the chip. */
if (system_in_suspend)
return 0;
pr_info("rfkill: BT RF going to : %s\n", blocked ? "off" : "on");
if (!blocked)
ret = mxc_bt_rfkill_power_change(rfkdata, 1);
else
ret = mxc_bt_rfkill_power_change(rfkdata, 0);
return ret;
}
static const struct rfkill_ops mxc_bt_rfkill_ops = {
.set_block = mxc_bt_set_block,
};
static int mxc_bt_power_event(struct notifier_block *this,
unsigned long event, void *dummy)
{
switch (event) {
case PM_SUSPEND_PREPARE:
system_in_suspend = 1;
/* going to suspend, don't reset chip */
break;
case PM_POST_SUSPEND:
system_in_suspend = 0;
/* System is resume, can reset chip */
break;
default:
break;
}
return NOTIFY_DONE;
}
static struct notifier_block mxc_bt_power_notifier = {
.notifier_call = mxc_bt_power_event,
};
#if defined(CONFIG_OF)
static const struct of_device_id mxc_bt_rfkill_dt_ids[] = {
{ .compatible = "fsl,mxc_bt_rfkill", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxc_bt_rfkill_dt_ids);
static struct mxc_bt_rfkill_pdata *mxc_bt_rfkill_of_populate_pdata(
struct device *dev)
{
struct device_node *of_node = dev->of_node;
struct mxc_bt_rfkill_pdata *pdata = dev->platform_data;
if (!of_node || pdata)
return pdata;
pdata = devm_kzalloc(dev, sizeof(struct mxc_bt_rfkill_pdata),
GFP_KERNEL);
if (!pdata)
return pdata;
return pdata;
}
#endif
static int mxc_bt_rfkill_probe(struct platform_device *pdev)
{
int rc;
struct rfkill *rfk;
struct mxc_bt_rfkill_data *data;
struct device *dev = &pdev->dev;
struct mxc_bt_rfkill_pdata *pdata = pdev->dev.platform_data;
struct device_node *np = pdev->dev.of_node;
data = devm_kzalloc(dev, sizeof(struct mxc_bt_rfkill_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
pdata = pdev->dev.platform_data;
if (!pdata) {
pdata = mxc_bt_rfkill_of_populate_pdata(&pdev->dev);
if (!pdata)
return -EINVAL;
}
data->bt_power_gpio = of_get_named_gpio(np, "bt-power-gpios", 0);
if (gpio_is_valid(data->bt_power_gpio)) {
printk(KERN_INFO "bt power gpio is:%d\n", data->bt_power_gpio);
rc = devm_gpio_request_one(&pdev->dev,
data->bt_power_gpio,
GPIOF_OUT_INIT_HIGH,
"BT power enable");
if (rc) {
dev_err(&pdev->dev, "unable to get bt-power-gpios\n");
goto error_request_gpio;
}
}
rc = register_pm_notifier(&mxc_bt_power_notifier);
if (rc)
goto error_check_func;
rfk = rfkill_alloc("mxc-bt", &pdev->dev, RFKILL_TYPE_BLUETOOTH,
&mxc_bt_rfkill_ops, data);
if (!rfk) {
rc = -ENOMEM;
goto error_rfk_alloc;
}
rc = rfkill_register(rfk);
if (rc)
goto error_rfkill;
platform_set_drvdata(pdev, rfk);
printk(KERN_INFO "mxc_bt_rfkill driver success loaded\n");
return 0;
error_rfkill:
rfkill_destroy(rfk);
error_request_gpio:
error_rfk_alloc:
error_check_func:
kfree(data);
return rc;
}
static int mxc_bt_rfkill_remove(struct platform_device *pdev)
{
struct mxc_bt_rfkill_data *data = platform_get_drvdata(pdev);
struct rfkill *rfk = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
if (rfk) {
rfkill_unregister(rfk);
rfkill_destroy(rfk);
}
mxc_bt_rfkill_power_change(data, 0);
kfree(data);
return 0;
}
static struct platform_driver mxc_bt_rfkill_driver = {
.probe = mxc_bt_rfkill_probe,
.remove = mxc_bt_rfkill_remove,
.driver = {
.name = "mxc_bt_rfkill",
.owner = THIS_MODULE,
.of_match_table = mxc_bt_rfkill_dt_ids,
},
};
module_platform_driver(mxc_bt_rfkill_driver)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("RFKill control interface of BT on MX6 Platform");
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