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