Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[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 <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");