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/*
* drivers/misc/bcm4329_rfkill.c
*
* Copyright (c) 2010, 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/err.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/rfkill.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/delay.h>
struct bcm4329_rfkill_data {
int gpio_reset;
int gpio_shutdown;
int delay;
struct clk *bt_32k_clk;
};
static struct bcm4329_rfkill_data *bcm4329_rfkill;
static int bcm4329_bt_rfkill_set_power(void *data, bool blocked)
{
/*
* check if BT gpio_shutdown line status and current request are same.
* If same, then return, else perform requested operation.
*/
if (gpio_get_value(bcm4329_rfkill->gpio_shutdown) && !blocked)
return 0;
if (blocked) {
if (bcm4329_rfkill->gpio_shutdown)
gpio_direction_output(bcm4329_rfkill->gpio_shutdown, 0);
if (bcm4329_rfkill->gpio_reset)
gpio_direction_output(bcm4329_rfkill->gpio_reset, 0);
if (bcm4329_rfkill->bt_32k_clk)
clk_disable(bcm4329_rfkill->bt_32k_clk);
} else {
if (bcm4329_rfkill->bt_32k_clk)
clk_enable(bcm4329_rfkill->bt_32k_clk);
if (bcm4329_rfkill->gpio_shutdown)
{
gpio_direction_output(bcm4329_rfkill->gpio_shutdown, 0);
msleep(100);
gpio_direction_output(bcm4329_rfkill->gpio_shutdown, 1);
msleep(100);
}
if (bcm4329_rfkill->gpio_reset)
{
gpio_direction_output(bcm4329_rfkill->gpio_reset, 0);
msleep(100);
gpio_direction_output(bcm4329_rfkill->gpio_reset, 1);
msleep(100);
}
}
return 0;
}
static const struct rfkill_ops bcm4329_bt_rfkill_ops = {
.set_block = bcm4329_bt_rfkill_set_power,
};
static int bcm4329_rfkill_probe(struct platform_device *pdev)
{
struct rfkill *bt_rfkill;
struct resource *res;
int ret;
bool enable = false; /* off */
bool default_sw_block_state;
bcm4329_rfkill = kzalloc(sizeof(*bcm4329_rfkill), GFP_KERNEL);
if (!bcm4329_rfkill)
return -ENOMEM;
bcm4329_rfkill->bt_32k_clk = clk_get(&pdev->dev, "bcm4329_32k_clk");
if (IS_ERR(bcm4329_rfkill->bt_32k_clk)) {
pr_warn("%s: can't find bcm4329_32k_clk.\
assuming 32k clock to chip\n", __func__);
bcm4329_rfkill->bt_32k_clk = NULL;
}
res = platform_get_resource_byname(pdev, IORESOURCE_IO,
"bcm4329_nreset_gpio");
if (res) {
bcm4329_rfkill->gpio_reset = res->start;
tegra_gpio_enable(bcm4329_rfkill->gpio_reset);
ret = gpio_request(bcm4329_rfkill->gpio_reset,
"bcm4329_nreset_gpio");
} else {
pr_warn("%s : can't find reset gpio.\n", __func__);
bcm4329_rfkill->gpio_reset = 0;
}
res = platform_get_resource_byname(pdev, IORESOURCE_IO,
"bcm4329_nshutdown_gpio");
if (res) {
bcm4329_rfkill->gpio_shutdown = res->start;
tegra_gpio_enable(bcm4329_rfkill->gpio_shutdown);
ret = gpio_request(bcm4329_rfkill->gpio_shutdown,
"bcm4329_nshutdown_gpio");
} else {
pr_warn("%s : can't find shutdown gpio.\n", __func__);
bcm4329_rfkill->gpio_shutdown = 0;
}
/* make sure at-least one of the GPIO is defined */
if (!bcm4329_rfkill->gpio_reset && !bcm4329_rfkill->gpio_shutdown)
goto free_bcm_res;
if (bcm4329_rfkill->bt_32k_clk && enable)
clk_enable(bcm4329_rfkill->bt_32k_clk);
if (bcm4329_rfkill->gpio_shutdown)
gpio_direction_output(bcm4329_rfkill->gpio_shutdown, enable);
if (bcm4329_rfkill->gpio_reset)
gpio_direction_output(bcm4329_rfkill->gpio_reset, enable);
bt_rfkill = rfkill_alloc("bcm4329 Bluetooth", &pdev->dev,
RFKILL_TYPE_BLUETOOTH, &bcm4329_bt_rfkill_ops,
NULL);
if (unlikely(!bt_rfkill))
goto free_bcm_res;
default_sw_block_state = !enable;
rfkill_set_states(bt_rfkill, default_sw_block_state, false);
ret = rfkill_register(bt_rfkill);
if (unlikely(ret)) {
rfkill_destroy(bt_rfkill);
goto free_bcm_res;
}
return 0;
free_bcm_res:
if (bcm4329_rfkill->gpio_shutdown)
gpio_free(bcm4329_rfkill->gpio_shutdown);
if (bcm4329_rfkill->gpio_reset)
gpio_free(bcm4329_rfkill->gpio_reset);
if (bcm4329_rfkill->bt_32k_clk && enable)
clk_disable(bcm4329_rfkill->bt_32k_clk);
if (bcm4329_rfkill->bt_32k_clk)
clk_put(bcm4329_rfkill->bt_32k_clk);
kfree(bcm4329_rfkill);
return -ENODEV;
}
static int bcm4329_rfkill_remove(struct platform_device *pdev)
{
struct rfkill *bt_rfkill = platform_get_drvdata(pdev);
if (bcm4329_rfkill->bt_32k_clk)
clk_put(bcm4329_rfkill->bt_32k_clk);
rfkill_unregister(bt_rfkill);
rfkill_destroy(bt_rfkill);
if (bcm4329_rfkill->gpio_shutdown)
gpio_free(bcm4329_rfkill->gpio_shutdown);
if (bcm4329_rfkill->gpio_reset)
gpio_free(bcm4329_rfkill->gpio_reset);
kfree(bcm4329_rfkill);
return 0;
}
static struct platform_driver bcm4329_rfkill_driver = {
.probe = bcm4329_rfkill_probe,
.remove = bcm4329_rfkill_remove,
.driver = {
.name = "bcm4329_rfkill",
.owner = THIS_MODULE,
},
};
static int __init bcm4329_rfkill_init(void)
{
return platform_driver_register(&bcm4329_rfkill_driver);
}
static void __exit bcm4329_rfkill_exit(void)
{
platform_driver_unregister(&bcm4329_rfkill_driver);
}
module_init(bcm4329_rfkill_init);
module_exit(bcm4329_rfkill_exit);
MODULE_DESCRIPTION("BCM4329 rfkill");
MODULE_AUTHOR("NVIDIA");
MODULE_LICENSE("GPL");
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