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 #include <linux/rfkill.h>
21
22 #include <mach/regs-gpio.h>
23 #include <mach/hardware.h>
24 #include <mach/h1940-latch.h>
25 #include <mach/h1940.h>
26
27 #define DRV_NAME "h1940-bt"
28
29 /* Bluetooth control */
h1940bt_enable(int on)30 static void h1940bt_enable(int on)
31 {
32 if (on) {
33 /* Power on the chip */
34 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
35 /* Reset the chip */
36 mdelay(10);
37
38 gpio_set_value(S3C2410_GPH(1), 1);
39 mdelay(10);
40 gpio_set_value(S3C2410_GPH(1), 0);
41
42 h1940_led_blink_set(-EINVAL, GPIO_LED_BLINK, NULL, NULL);
43 }
44 else {
45 gpio_set_value(S3C2410_GPH(1), 1);
46 mdelay(10);
47 gpio_set_value(S3C2410_GPH(1), 0);
48 mdelay(10);
49 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
50
51 h1940_led_blink_set(-EINVAL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
52 }
53 }
54
h1940bt_set_block(void * data,bool blocked)55 static int h1940bt_set_block(void *data, bool blocked)
56 {
57 h1940bt_enable(!blocked);
58 return 0;
59 }
60
61 static const struct rfkill_ops h1940bt_rfkill_ops = {
62 .set_block = h1940bt_set_block,
63 };
64
h1940bt_probe(struct platform_device * pdev)65 static int __devinit h1940bt_probe(struct platform_device *pdev)
66 {
67 struct rfkill *rfk;
68 int ret = 0;
69
70 ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
71 if (ret) {
72 dev_err(&pdev->dev, "could not get GPH1\n");
73 return ret;
74 }
75
76 ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
77 if (ret) {
78 gpio_free(S3C2410_GPH(1));
79 dev_err(&pdev->dev, "could not get BT_POWER\n");
80 return ret;
81 }
82
83 /* Configures BT serial port GPIOs */
84 s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
85 s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
86 s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
87 s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
88 s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
89 s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
90 s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
91 s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
92
93 rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
94 &h1940bt_rfkill_ops, NULL);
95 if (!rfk) {
96 ret = -ENOMEM;
97 goto err_rfk_alloc;
98 }
99
100 ret = rfkill_register(rfk);
101 if (ret)
102 goto err_rfkill;
103
104 platform_set_drvdata(pdev, rfk);
105
106 return 0;
107
108 err_rfkill:
109 rfkill_destroy(rfk);
110 err_rfk_alloc:
111 return ret;
112 }
113
h1940bt_remove(struct platform_device * pdev)114 static int h1940bt_remove(struct platform_device *pdev)
115 {
116 struct rfkill *rfk = platform_get_drvdata(pdev);
117
118 platform_set_drvdata(pdev, NULL);
119 gpio_free(S3C2410_GPH(1));
120
121 if (rfk) {
122 rfkill_unregister(rfk);
123 rfkill_destroy(rfk);
124 }
125 rfk = NULL;
126
127 h1940bt_enable(0);
128
129 return 0;
130 }
131
132
133 static struct platform_driver h1940bt_driver = {
134 .driver = {
135 .name = DRV_NAME,
136 },
137 .probe = h1940bt_probe,
138 .remove = h1940bt_remove,
139 };
140
141
h1940bt_init(void)142 static int __init h1940bt_init(void)
143 {
144 return platform_driver_register(&h1940bt_driver);
145 }
146
h1940bt_exit(void)147 static void __exit h1940bt_exit(void)
148 {
149 platform_driver_unregister(&h1940bt_driver);
150 }
151
152 module_init(h1940bt_init);
153 module_exit(h1940bt_exit);
154
155 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
156 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
157 MODULE_LICENSE("GPL");
158