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/*
* arch/arm/mach-s3c2410/h1940-bluetooth.c
* Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
* S3C2410 bluetooth "driver"
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <mach/h1940-latch.h>
#define DRV_NAME "h1940-bt"
#ifdef CONFIG_LEDS_H1940
DEFINE_LED_TRIGGER(bt_led_trigger);
#endif
static int state;
/* Bluetooth control */
static void h1940bt_enable(int on)
{
if (on) {
#ifdef CONFIG_LEDS_H1940
/* flashing Blue */
led_trigger_event(bt_led_trigger, LED_HALF);
#endif
/* Power on the chip */
h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
/* Reset the chip */
mdelay(10);
s3c2410_gpio_setpin(S3C2410_GPH1, 1);
mdelay(10);
s3c2410_gpio_setpin(S3C2410_GPH1, 0);
state = 1;
}
else {
#ifdef CONFIG_LEDS_H1940
led_trigger_event(bt_led_trigger, 0);
#endif
s3c2410_gpio_setpin(S3C2410_GPH1, 1);
mdelay(10);
s3c2410_gpio_setpin(S3C2410_GPH1, 0);
mdelay(10);
h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
state = 0;
}
}
static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d\n", state);
}
static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
int new_state;
char *endp;
new_state = simple_strtoul(buf, &endp, 0);
if (*endp && !isspace(*endp))
return -EINVAL;
h1940bt_enable(new_state);
return count;
}
static DEVICE_ATTR(enable, 0644,
h1940bt_show,
h1940bt_store);
static int __init h1940bt_probe(struct platform_device *pdev)
{
/* Configures BT serial port GPIOs */
s3c2410_gpio_cfgpin(S3C2410_GPH0, S3C2410_GPH0_nCTS0);
s3c2410_gpio_pullup(S3C2410_GPH0, 1);
s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPIO_OUTPUT);
s3c2410_gpio_pullup(S3C2410_GPH1, 1);
s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
s3c2410_gpio_pullup(S3C2410_GPH2, 1);
s3c2410_gpio_cfgpin(S3C2410_GPH3, S3C2410_GPH3_RXD0);
s3c2410_gpio_pullup(S3C2410_GPH3, 1);
#ifdef CONFIG_LEDS_H1940
led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
#endif
/* disable BT by default */
h1940bt_enable(0);
return device_create_file(&pdev->dev, &dev_attr_enable);
}
static int h1940bt_remove(struct platform_device *pdev)
{
#ifdef CONFIG_LEDS_H1940
led_trigger_unregister_simple(bt_led_trigger);
#endif
return 0;
}
static struct platform_driver h1940bt_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = h1940bt_probe,
.remove = h1940bt_remove,
};
static int __init h1940bt_init(void)
{
return platform_driver_register(&h1940bt_driver);
}
static void __exit h1940bt_exit(void)
{
platform_driver_unregister(&h1940bt_driver);
}
module_init(h1940bt_init);
module_exit(h1940bt_exit);
MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
MODULE_LICENSE("GPL");
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