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