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 */
25static 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
50static int h1940bt_set_block(void *data, bool blocked)
51{
52	h1940bt_enable(!blocked);
53	return 0;
54}
55
56static const struct rfkill_ops h1940bt_rfkill_ops = {
57	.set_block = h1940bt_set_block,
58};
59
60static 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
103err_rfkill:
104	rfkill_destroy(rfk);
105err_rfk_alloc:
106	return ret;
107}
108
109static 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
128static struct platform_driver h1940bt_driver = {
129	.driver		= {
130		.name	= DRV_NAME,
131	},
132	.probe		= h1940bt_probe,
133	.remove		= h1940bt_remove,
134};
135
136module_platform_driver(h1940bt_driver);
137
138MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
139MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
140MODULE_LICENSE("GPL");
141