1 /*
2 * arch/arm/mach-s3c2410/h1940-bluetooth.c
3 * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file COPYING in the main directory of this archive for
7 * more details.
8 *
9 * S3C2410 bluetooth "driver"
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/delay.h>
16 #include <linux/string.h>
17 #include <linux/ctype.h>
18 #include <linux/leds.h>
19 #include <linux/gpio.h>
20
21 #include <mach/regs-gpio.h>
22 #include <mach/hardware.h>
23 #include <mach/h1940-latch.h>
24
25 #define DRV_NAME "h1940-bt"
26
27 #ifdef CONFIG_LEDS_H1940
28 DEFINE_LED_TRIGGER(bt_led_trigger);
29 #endif
30
31 static int state;
32
33 /* Bluetooth control */
34 static void h1940bt_enable(int on)
35 {
36 if (on) {
37 #ifdef CONFIG_LEDS_H1940
38 /* flashing Blue */
39 led_trigger_event(bt_led_trigger, LED_HALF);
40 #endif
41
42 /* Power on the chip */
43 h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
44 /* Reset the chip */
45 mdelay(10);
46 s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
47 mdelay(10);
48 s3c2410_gpio_setpin(S3C2410_GPH(1), 0);
49
50 state = 1;
51 }
52 else {
53 #ifdef CONFIG_LEDS_H1940
54 led_trigger_event(bt_led_trigger, 0);
55 #endif
56
57 s3c2410_gpio_setpin(S3C2410_GPH(1), 1);
58 mdelay(10);
59 s3c2410_gpio_setpin(S3C2410_GPH(1), 0);
60 mdelay(10);
61 h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
62
63 state = 0;
64 }
65 }
66
67 static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
68 {
69 return snprintf(buf, PAGE_SIZE, "%d\n", state);
70 }
71
72 static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
73 {
74 int new_state;
75 char *endp;
76
77 new_state = simple_strtoul(buf, &endp, 0);
78 if (*endp && !isspace(*endp))
79 return -EINVAL;
80
81 h1940bt_enable(new_state);
82
83 return count;
84 }
85 static DEVICE_ATTR(enable, 0644,
86 h1940bt_show,
87 h1940bt_store);
88
89 static int __init h1940bt_probe(struct platform_device *pdev)
90 {
91 /* Configures BT serial port GPIOs */
92 s3c2410_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
93 s3c2410_gpio_pullup(S3C2410_GPH(0), 1);
94 s3c2410_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
95 s3c2410_gpio_pullup(S3C2410_GPH(1), 1);
96 s3c2410_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
97 s3c2410_gpio_pullup(S3C2410_GPH(2), 1);
98 s3c2410_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
99 s3c2410_gpio_pullup(S3C2410_GPH(3), 1);
100
101 #ifdef CONFIG_LEDS_H1940
102 led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
103 #endif
104
105 /* disable BT by default */
106 h1940bt_enable(0);
107
108 return device_create_file(&pdev->dev, &dev_attr_enable);
109 }
110
111 static int h1940bt_remove(struct platform_device *pdev)
112 {
113 #ifdef CONFIG_LEDS_H1940
114 led_trigger_unregister_simple(bt_led_trigger);
115 #endif
116 return 0;
117 }
118
119
120 static struct platform_driver h1940bt_driver = {
121 .driver = {
122 .name = DRV_NAME,
123 },
124 .probe = h1940bt_probe,
125 .remove = h1940bt_remove,
126 };
127
128
129 static int __init h1940bt_init(void)
130 {
131 return platform_driver_register(&h1940bt_driver);
132 }
133
134 static void __exit h1940bt_exit(void)
135 {
136 platform_driver_unregister(&h1940bt_driver);
137 }
138
139 module_init(h1940bt_init);
140 module_exit(h1940bt_exit);
141
142 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
143 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
144 MODULE_LICENSE("GPL");
145
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