1 // SPDX-License-Identifier: GPL-1.0+
2 //
3 // Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
4 //
5 // S3C2410 bluetooth "driver"
6
7 #include <linux/module.h>
8 #include <linux/platform_device.h>
9 #include <linux/delay.h>
10 #include <linux/string.h>
11 #include <linux/ctype.h>
12 #include <linux/leds.h>
13 #include <linux/gpio.h>
14 #include <linux/rfkill.h>
15
16 #include <plat/gpio-cfg.h>
17 #include <mach/hardware.h>
18 #include <mach/regs-gpio.h>
19 #include <mach/gpio-samsung.h>
20
21 #include "h1940.h"
22
23 #define DRV_NAME "h1940-bt"
24
25 /* Bluetooth control */
h1940bt_enable(int on)26 static void h1940bt_enable(int on)
27 {
28 if (on) {
29 /* Power on the chip */
30 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 1);
31 /* Reset the chip */
32 mdelay(10);
33
34 gpio_set_value(S3C2410_GPH(1), 1);
35 mdelay(10);
36 gpio_set_value(S3C2410_GPH(1), 0);
37
38 h1940_led_blink_set(NULL, GPIO_LED_BLINK, NULL, NULL);
39 }
40 else {
41 gpio_set_value(S3C2410_GPH(1), 1);
42 mdelay(10);
43 gpio_set_value(S3C2410_GPH(1), 0);
44 mdelay(10);
45 gpio_set_value(H1940_LATCH_BLUETOOTH_POWER, 0);
46
47 h1940_led_blink_set(NULL, GPIO_LED_NO_BLINK_LOW, NULL, NULL);
48 }
49 }
50
h1940bt_set_block(void * data,bool blocked)51 static int h1940bt_set_block(void *data, bool blocked)
52 {
53 h1940bt_enable(!blocked);
54 return 0;
55 }
56
57 static const struct rfkill_ops h1940bt_rfkill_ops = {
58 .set_block = h1940bt_set_block,
59 };
60
h1940bt_probe(struct platform_device * pdev)61 static int h1940bt_probe(struct platform_device *pdev)
62 {
63 struct rfkill *rfk;
64 int ret = 0;
65
66 ret = gpio_request(S3C2410_GPH(1), dev_name(&pdev->dev));
67 if (ret) {
68 dev_err(&pdev->dev, "could not get GPH1\n");
69 return ret;
70 }
71
72 ret = gpio_request(H1940_LATCH_BLUETOOTH_POWER, dev_name(&pdev->dev));
73 if (ret) {
74 gpio_free(S3C2410_GPH(1));
75 dev_err(&pdev->dev, "could not get BT_POWER\n");
76 return ret;
77 }
78
79 /* Configures BT serial port GPIOs */
80 s3c_gpio_cfgpin(S3C2410_GPH(0), S3C2410_GPH0_nCTS0);
81 s3c_gpio_setpull(S3C2410_GPH(0), S3C_GPIO_PULL_NONE);
82 s3c_gpio_cfgpin(S3C2410_GPH(1), S3C2410_GPIO_OUTPUT);
83 s3c_gpio_setpull(S3C2410_GPH(1), S3C_GPIO_PULL_NONE);
84 s3c_gpio_cfgpin(S3C2410_GPH(2), S3C2410_GPH2_TXD0);
85 s3c_gpio_setpull(S3C2410_GPH(2), S3C_GPIO_PULL_NONE);
86 s3c_gpio_cfgpin(S3C2410_GPH(3), S3C2410_GPH3_RXD0);
87 s3c_gpio_setpull(S3C2410_GPH(3), S3C_GPIO_PULL_NONE);
88
89 rfk = rfkill_alloc(DRV_NAME, &pdev->dev, RFKILL_TYPE_BLUETOOTH,
90 &h1940bt_rfkill_ops, NULL);
91 if (!rfk) {
92 ret = -ENOMEM;
93 goto err_rfk_alloc;
94 }
95
96 ret = rfkill_register(rfk);
97 if (ret)
98 goto err_rfkill;
99
100 platform_set_drvdata(pdev, rfk);
101
102 return 0;
103
104 err_rfkill:
105 rfkill_destroy(rfk);
106 err_rfk_alloc:
107 return ret;
108 }
109
h1940bt_remove(struct platform_device * pdev)110 static int h1940bt_remove(struct platform_device *pdev)
111 {
112 struct rfkill *rfk = platform_get_drvdata(pdev);
113
114 platform_set_drvdata(pdev, NULL);
115 gpio_free(S3C2410_GPH(1));
116
117 if (rfk) {
118 rfkill_unregister(rfk);
119 rfkill_destroy(rfk);
120 }
121 rfk = NULL;
122
123 h1940bt_enable(0);
124
125 return 0;
126 }
127
128
129 static struct platform_driver h1940bt_driver = {
130 .driver = {
131 .name = DRV_NAME,
132 },
133 .probe = h1940bt_probe,
134 .remove = h1940bt_remove,
135 };
136
137 module_platform_driver(h1940bt_driver);
138
139 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
140 MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
141 MODULE_LICENSE("GPL");
142