1 /*
2 * Bluetooth built-in chip control
3 *
4 * Copyright (c) 2008 Dmitry Baryshkov
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/gpio.h>
16 #include <linux/delay.h>
17 #include <linux/rfkill.h>
18
19 #include <mach/tosa_bt.h>
20
tosa_bt_on(struct tosa_bt_data * data)21 static void tosa_bt_on(struct tosa_bt_data *data)
22 {
23 gpio_set_value(data->gpio_reset, 0);
24 gpio_set_value(data->gpio_pwr, 1);
25 gpio_set_value(data->gpio_reset, 1);
26 mdelay(20);
27 gpio_set_value(data->gpio_reset, 0);
28 }
29
tosa_bt_off(struct tosa_bt_data * data)30 static void tosa_bt_off(struct tosa_bt_data *data)
31 {
32 gpio_set_value(data->gpio_reset, 1);
33 mdelay(10);
34 gpio_set_value(data->gpio_pwr, 0);
35 gpio_set_value(data->gpio_reset, 0);
36 }
37
tosa_bt_set_block(void * data,bool blocked)38 static int tosa_bt_set_block(void *data, bool blocked)
39 {
40 pr_info("BT_RADIO going: %s\n", blocked ? "off" : "on");
41
42 if (!blocked) {
43 pr_info("TOSA_BT: going ON\n");
44 tosa_bt_on(data);
45 } else {
46 pr_info("TOSA_BT: going OFF\n");
47 tosa_bt_off(data);
48 }
49
50 return 0;
51 }
52
53 static const struct rfkill_ops tosa_bt_rfkill_ops = {
54 .set_block = tosa_bt_set_block,
55 };
56
tosa_bt_probe(struct platform_device * dev)57 static int tosa_bt_probe(struct platform_device *dev)
58 {
59 int rc;
60 struct rfkill *rfk;
61
62 struct tosa_bt_data *data = dev->dev.platform_data;
63
64 rc = gpio_request(data->gpio_reset, "Bluetooth reset");
65 if (rc)
66 goto err_reset;
67 rc = gpio_direction_output(data->gpio_reset, 0);
68 if (rc)
69 goto err_reset_dir;
70 rc = gpio_request(data->gpio_pwr, "Bluetooth power");
71 if (rc)
72 goto err_pwr;
73 rc = gpio_direction_output(data->gpio_pwr, 0);
74 if (rc)
75 goto err_pwr_dir;
76
77 rfk = rfkill_alloc("tosa-bt", &dev->dev, RFKILL_TYPE_BLUETOOTH,
78 &tosa_bt_rfkill_ops, data);
79 if (!rfk) {
80 rc = -ENOMEM;
81 goto err_rfk_alloc;
82 }
83
84 rc = rfkill_register(rfk);
85 if (rc)
86 goto err_rfkill;
87
88 platform_set_drvdata(dev, rfk);
89
90 return 0;
91
92 err_rfkill:
93 rfkill_destroy(rfk);
94 err_rfk_alloc:
95 tosa_bt_off(data);
96 err_pwr_dir:
97 gpio_free(data->gpio_pwr);
98 err_pwr:
99 err_reset_dir:
100 gpio_free(data->gpio_reset);
101 err_reset:
102 return rc;
103 }
104
tosa_bt_remove(struct platform_device * dev)105 static int tosa_bt_remove(struct platform_device *dev)
106 {
107 struct tosa_bt_data *data = dev->dev.platform_data;
108 struct rfkill *rfk = platform_get_drvdata(dev);
109
110 platform_set_drvdata(dev, NULL);
111
112 if (rfk) {
113 rfkill_unregister(rfk);
114 rfkill_destroy(rfk);
115 }
116 rfk = NULL;
117
118 tosa_bt_off(data);
119
120 gpio_free(data->gpio_pwr);
121 gpio_free(data->gpio_reset);
122
123 return 0;
124 }
125
126 static struct platform_driver tosa_bt_driver = {
127 .probe = tosa_bt_probe,
128 .remove = tosa_bt_remove,
129
130 .driver = {
131 .name = "tosa-bt",
132 .owner = THIS_MODULE,
133 },
134 };
135
136
tosa_bt_init(void)137 static int __init tosa_bt_init(void)
138 {
139 return platform_driver_register(&tosa_bt_driver);
140 }
141
tosa_bt_exit(void)142 static void __exit tosa_bt_exit(void)
143 {
144 platform_driver_unregister(&tosa_bt_driver);
145 }
146
147 module_init(tosa_bt_init);
148 module_exit(tosa_bt_exit);
149