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/*
* bcm47511.c: Machine specific driver for GPS module
*
* Copyright (c) 2011 Samsung Electronics
* Minho Ban <mhban@samsung.com>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/rfkill.h>
#include <linux/regulator/machine.h>
#include <mach/gpio.h>
#include <mach/bcm47511.h>
#include <plat/gpio-cfg.h>
struct bcm47511_data {
struct bcm47511_platform_data *pdata;
struct rfkill *rfk;
bool in_use;
bool regulator_state;
struct regulator *regulator;
};
static void bcm47511_enable(void *data)
{
struct bcm47511_data *bd = data;
struct bcm47511_platform_data *pdata = bd->pdata;
if (bd->regulator && !bd->regulator_state) {
regulator_enable(bd->regulator);
bd->regulator_state = true;
}
gpio_set_value(pdata->regpu, 1);
if (gpio_is_valid(pdata->nrst))
gpio_set_value(pdata->nrst, 1);
if (gpio_is_valid(pdata->gps_cntl))
gpio_set_value(pdata->gps_cntl, 1);
bd->in_use = true;
}
static void bcm47511_disable(void *data)
{
struct bcm47511_data *bd = data;
struct bcm47511_platform_data *pdata = bd->pdata;
gpio_set_value(pdata->regpu, 0);
if (gpio_is_valid(pdata->gps_cntl))
gpio_set_value(pdata->gps_cntl, 0);
if (bd->regulator && bd->regulator_state) {
regulator_disable(bd->regulator);
bd->regulator_state = false;
}
bd->in_use = false;
}
static int bcm47511_set_block(void *data, bool blocked)
{
if (!blocked) {
printk(KERN_INFO "%s : Enable GPS chip\n", __func__);
bcm47511_enable(data);
} else {
printk(KERN_INFO "%s : Disable GPS chip\n", __func__);
bcm47511_disable(data);
}
return 0;
}
static const struct rfkill_ops bcm47511_rfkill_ops = {
.set_block = bcm47511_set_block,
};
static int __devinit bcm47511_probe(struct platform_device *dev)
{
struct bcm47511_platform_data *pdata;
struct bcm47511_data *bd;
int gpio;
int ret = 0;
pdata = dev->dev.platform_data;
if (!pdata) {
dev_err(&dev->dev, "No plat data.\n");
return -EINVAL;
}
if (!pdata->reg32khz) {
dev_err(&dev->dev, "No 32KHz clock id.\n");
return -EINVAL;
}
bd = kzalloc(sizeof(struct bcm47511_data), GFP_KERNEL);
if (!bd)
return -ENOMEM;
bd->pdata = pdata;
if (gpio_is_valid(pdata->regpu)) {
gpio = pdata->regpu;
/* GPS_EN is low */
gpio_request(gpio, "GPS_EN");
gpio_direction_output(gpio, 0);
}
if (gpio_is_valid(pdata->nrst)) {
gpio = pdata->nrst;
/* GPS_nRST is high */
gpio_request(gpio, "GPS_nRST");
gpio_direction_output(gpio, 1);
}
/* GPS_UART_RXD */
if (gpio_is_valid(pdata->uart_rxd))
s3c_gpio_setpull(pdata->uart_rxd, S3C_GPIO_PULL_UP);
if (gpio_is_valid(pdata->gps_cntl)) {
gpio = pdata->gps_cntl;
gpio_request(gpio, "GPS_CNTL");
gpio_direction_output(gpio, 0);
}
/* Register BCM47511 to RFKILL class */
bd->rfk = rfkill_alloc("bcm47511", &dev->dev, RFKILL_TYPE_GPS,
&bcm47511_rfkill_ops, bd);
if (!bd->rfk) {
ret = -ENOMEM;
goto err_rfk_alloc;
}
bd->regulator = regulator_get(&dev->dev, pdata->reg32khz);
if (IS_ERR_OR_NULL(bd->regulator)) {
dev_err(&dev->dev, "regulator_get error (%ld)\n",
PTR_ERR(bd->regulator));
goto err_regulator;
}
bd->regulator_state = false;
/*
* described by the comment in rfkill.h
* true : turn off
* false : turn on
*/
rfkill_init_sw_state(bd->rfk, true);
bd->in_use = false;
ret = rfkill_register(bd->rfk);
if (ret)
goto err_rfkill;
platform_set_drvdata(dev, bd);
dev_info(&dev->dev, "ready\n");
return 0;
err_rfkill:
rfkill_destroy(bd->rfk);
err_regulator:
err_rfk_alloc:
kfree(bd);
return ret;
}
static int __devexit bcm47511_remove(struct platform_device *dev)
{
struct bcm47511_data *bd = platform_get_drvdata(dev);
struct bcm47511_platform_data *pdata = bd->pdata;
rfkill_unregister(bd->rfk);
rfkill_destroy(bd->rfk);
gpio_free(pdata->regpu);
gpio_free(pdata->nrst);
kfree(bd);
platform_set_drvdata(dev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int bcm47511_suspend(struct platform_device *dev, pm_message_t stata)
{
struct bcm47511_data *bd = platform_get_drvdata(dev);
struct bcm47511_platform_data *pdata = bd->pdata;
if (bd->in_use) {
s5p_gpio_set_pd_cfg(pdata->regpu, S5P_GPIO_PD_OUTPUT1);
s5p_gpio_set_pd_cfg(pdata->nrst, S5P_GPIO_PD_OUTPUT1);
if (gpio_is_valid(pdata->gps_cntl))
s5p_gpio_set_pd_cfg(pdata->gps_cntl, S5P_GPIO_PD_OUTPUT1);
} else {
s5p_gpio_set_pd_cfg(pdata->regpu, S5P_GPIO_PD_OUTPUT0);
s5p_gpio_set_pd_cfg(pdata->nrst, S5P_GPIO_PD_OUTPUT0);
if (gpio_is_valid(pdata->gps_cntl))
s5p_gpio_set_pd_cfg(pdata->gps_cntl, S5P_GPIO_PD_OUTPUT0);
}
return 0;
}
static int bcm47511_resume(struct platform_device *dev)
{
return 0;
}
#else
#define bcm47511_suspend NULL
#define bcm47511_resume NULL
#endif
static struct platform_driver bcm47511_driver = {
.probe = bcm47511_probe,
.remove = __devexit_p(bcm47511_remove),
.suspend = bcm47511_suspend,
.resume = bcm47511_resume,
.driver = {
.name = "bcm47511",
},
};
static int __init bcm47511_init(void)
{
return platform_driver_register(&bcm47511_driver);
}
static void __exit bcm47511_exit(void)
{
platform_driver_unregister(&bcm47511_driver);
}
module_init(bcm47511_init);
module_exit(bcm47511_exit);
MODULE_AUTHOR("Minho Ban <mhban@samsung.com>");
MODULE_DESCRIPTION("BCM47511 GPS module driver");
MODULE_LICENSE("GPL");
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