summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-s3c2410/h1940-bluetooth.c
blob: 5aabf117cbb01742fac3e340374c471e2fb60755 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
 * 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_GPH(1), 1);
		mdelay(10);
		s3c2410_gpio_setpin(S3C2410_GPH(1), 0);

		state = 1;
	}
	else {
#ifdef CONFIG_LEDS_H1940
		led_trigger_event(bt_led_trigger, 0);
#endif

		s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
		mdelay(10);
		s3c2410_gpio_setpin(S3C2410_GPH(1), 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_GPH(0), S3C2410_GPH0_nCTS0);
	s3c2410_gpio_pullup(S3C2410_GPH(0), 1);
	s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
	s3c2410_gpio_pullup(S3C2410_GPH(1), 1);
	s3c2410_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
	s3c2410_gpio_pullup(S3C2410_GPH(2), 1);
	s3c2410_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
	s3c2410_gpio_pullup(S3C2410_GPH(3), 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");
OpenPOWER on IntegriCloud