Merge http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm into...
[linux-2.6] / arch / arm / mach-s3c2410 / h1940-bluetooth.c
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 <mach/regs-gpio.h>
20 #include <mach/hardware.h>
21 #include <mach/h1940-latch.h>
22
23 #define DRV_NAME              "h1940-bt"
24
25 #ifdef CONFIG_LEDS_H1940
26 DEFINE_LED_TRIGGER(bt_led_trigger);
27 #endif
28
29 static int state;
30
31 /* Bluetooth control */
32 static void h1940bt_enable(int on)
33 {
34         if (on) {
35 #ifdef CONFIG_LEDS_H1940
36                 /* flashing Blue */
37                 led_trigger_event(bt_led_trigger, LED_HALF);
38 #endif
39
40                 /* Power on the chip */
41                 h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
42                 /* Reset the chip */
43                 mdelay(10);
44                 s3c2410_gpio_setpin(S3C2410_GPH1, 1);
45                 mdelay(10);
46                 s3c2410_gpio_setpin(S3C2410_GPH1, 0);
47
48                 state = 1;
49         }
50         else {
51 #ifdef CONFIG_LEDS_H1940
52                 led_trigger_event(bt_led_trigger, 0);
53 #endif
54
55                 s3c2410_gpio_setpin(S3C2410_GPH1, 1);
56                 mdelay(10);
57                 s3c2410_gpio_setpin(S3C2410_GPH1, 0);
58                 mdelay(10);
59                 h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
60
61                 state = 0;
62         }
63 }
64
65 static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
66 {
67         return snprintf(buf, PAGE_SIZE, "%d\n", state);
68 }
69
70 static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
71 {
72         int new_state;
73         char *endp;
74
75         new_state = simple_strtoul(buf, &endp, 0);
76         if (*endp && !isspace(*endp))
77                 return -EINVAL;
78
79         h1940bt_enable(new_state);
80
81         return count;
82 }
83 static DEVICE_ATTR(enable, 0644,
84                 h1940bt_show,
85                 h1940bt_store);
86
87 static int __init h1940bt_probe(struct platform_device *pdev)
88 {
89         /* Configures BT serial port GPIOs */
90         s3c2410_gpio_cfgpin(S3C2410_GPH0, S3C2410_GPH0_nCTS0);
91         s3c2410_gpio_pullup(S3C2410_GPH0, 1);
92         s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
93         s3c2410_gpio_pullup(S3C2410_GPH1, 1);
94         s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
95         s3c2410_gpio_pullup(S3C2410_GPH2, 1);
96         s3c2410_gpio_cfgpin(S3C2410_GPH3, S3C2410_GPH3_RXD0);
97         s3c2410_gpio_pullup(S3C2410_GPH3, 1);
98
99 #ifdef CONFIG_LEDS_H1940
100         led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
101 #endif
102
103         /* disable BT by default */
104         h1940bt_enable(0);
105
106         return device_create_file(&pdev->dev, &dev_attr_enable);
107 }
108
109 static int h1940bt_remove(struct platform_device *pdev)
110 {
111 #ifdef CONFIG_LEDS_H1940
112         led_trigger_unregister_simple(bt_led_trigger);
113 #endif
114         return 0;
115 }
116
117
118 static struct platform_driver h1940bt_driver = {
119         .driver         = {
120                 .name   = DRV_NAME,
121         },
122         .probe          = h1940bt_probe,
123         .remove         = h1940bt_remove,
124 };
125
126
127 static int __init h1940bt_init(void)
128 {
129         return platform_driver_register(&h1940bt_driver);
130 }
131
132 static void __exit h1940bt_exit(void)
133 {
134         platform_driver_unregister(&h1940bt_driver);
135 }
136
137 module_init(h1940bt_init);
138 module_exit(h1940bt_exit);
139
140 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
141 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
142 MODULE_LICENSE("GPL");