1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com>
4 *
5 * Original author:
6 * Ben Collins <bcollins@ubuntu.com>
7 *
8 * Additional work by:
9 * John Brooks <john.brooks@bluecherry.net>
10 */
11
12#include <linux/kernel.h>
13#include <linux/fs.h>
14#include <linux/delay.h>
15#include <linux/uaccess.h>
16
17#include "solo6x10.h"
18
19static void solo_gpio_mode(struct solo_dev *solo_dev,
20			   unsigned int port_mask, unsigned int mode)
21{
22	int port;
23	unsigned int ret;
24
25	ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0);
26
27	/* To set gpio */
28	for (port = 0; port < 16; port++) {
29		if (!((1 << port) & port_mask))
30			continue;
31
32		ret &= (~(3 << (port << 1)));
33		ret |= ((mode & 3) << (port << 1));
34	}
35
36	solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_0, ret);
37
38	/* To set extended gpio - sensor */
39	ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1);
40
41	for (port = 0; port < 16; port++) {
42		if (!((1UL << (port + 16)) & port_mask))
43			continue;
44
45		if (!mode)
46			ret &= ~(1UL << port);
47		else
48			ret |= 1UL << port;
49	}
50
51	/* Enable GPIO[31:16] */
52	ret |= 0xffff0000;
53
54	solo_reg_write(solo_dev, SOLO_GPIO_CONFIG_1, ret);
55}
56
57static void solo_gpio_set(struct solo_dev *solo_dev, unsigned int value)
58{
59	solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
60		       solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) | value);
61}
62
63static void solo_gpio_clear(struct solo_dev *solo_dev, unsigned int value)
64{
65	solo_reg_write(solo_dev, SOLO_GPIO_DATA_OUT,
66		       solo_reg_read(solo_dev, SOLO_GPIO_DATA_OUT) & ~value);
67}
68
69static void solo_gpio_config(struct solo_dev *solo_dev)
70{
71	/* Video reset */
72	solo_gpio_mode(solo_dev, 0x30, 1);
73	solo_gpio_clear(solo_dev, 0x30);
74	udelay(100);
75	solo_gpio_set(solo_dev, 0x30);
76	udelay(100);
77
78	/* Warning: Don't touch the next line unless you're sure of what
79	 * you're doing: first four gpio [0-3] are used for video. */
80	solo_gpio_mode(solo_dev, 0x0f, 2);
81
82	/* We use bit 8-15 of SOLO_GPIO_CONFIG_0 for relay purposes */
83	solo_gpio_mode(solo_dev, 0xff00, 1);
84
85	/* Initially set relay status to 0 */
86	solo_gpio_clear(solo_dev, 0xff00);
87
88	/* Set input pins direction */
89	solo_gpio_mode(solo_dev, 0xffff0000, 0);
90}
91
92#ifdef CONFIG_GPIOLIB
93/* Pins 0-7 are not exported, because it seems from code above they are
94 * used for internal purposes. So offset 0 corresponds to pin 8, therefore
95 * offsets 0-7 are relay GPIOs, 8-23 - input GPIOs.
96 */
97static int solo_gpiochip_get_direction(struct gpio_chip *chip,
98				       unsigned int offset)
99{
100	int ret, mode;
101	struct solo_dev *solo_dev = gpiochip_get_data(chip);
102
103	if (offset < 8) {
104		ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_0);
105		mode = 3 & (ret >> ((offset + 8) * 2));
106	} else {
107		ret = solo_reg_read(solo_dev, SOLO_GPIO_CONFIG_1);
108		mode =  1 & (ret >> (offset - 8));
109	}
110
111	if (!mode)
112		return 1;
113	else if (mode == 1)
114		return 0;
115
116	return -1;
117}
118
119static int solo_gpiochip_direction_input(struct gpio_chip *chip,
120					 unsigned int offset)
121{
122	return -1;
123}
124
125static int solo_gpiochip_direction_output(struct gpio_chip *chip,
126					  unsigned int offset, int value)
127{
128	return -1;
129}
130
131static int solo_gpiochip_get(struct gpio_chip *chip,
132						unsigned int offset)
133{
134	int ret;
135	struct solo_dev *solo_dev = gpiochip_get_data(chip);
136
137	ret = solo_reg_read(solo_dev, SOLO_GPIO_DATA_IN);
138
139	return 1 & (ret >> (offset + 8));
140}
141
142static void solo_gpiochip_set(struct gpio_chip *chip,
143						unsigned int offset, int value)
144{
145	struct solo_dev *solo_dev = gpiochip_get_data(chip);
146
147	if (value)
148		solo_gpio_set(solo_dev, 1 << (offset + 8));
149	else
150		solo_gpio_clear(solo_dev, 1 << (offset + 8));
151}
152#endif
153
154int solo_gpio_init(struct solo_dev *solo_dev)
155{
156#ifdef CONFIG_GPIOLIB
157	int ret;
158#endif
159
160	solo_gpio_config(solo_dev);
161#ifdef CONFIG_GPIOLIB
162	solo_dev->gpio_dev.label = SOLO6X10_NAME"_gpio";
163	solo_dev->gpio_dev.parent = &solo_dev->pdev->dev;
164	solo_dev->gpio_dev.owner = THIS_MODULE;
165	solo_dev->gpio_dev.base = -1;
166	solo_dev->gpio_dev.ngpio = 24;
167	solo_dev->gpio_dev.can_sleep = 0;
168
169	solo_dev->gpio_dev.get_direction = solo_gpiochip_get_direction;
170	solo_dev->gpio_dev.direction_input = solo_gpiochip_direction_input;
171	solo_dev->gpio_dev.direction_output = solo_gpiochip_direction_output;
172	solo_dev->gpio_dev.get = solo_gpiochip_get;
173	solo_dev->gpio_dev.set = solo_gpiochip_set;
174
175	ret = gpiochip_add_data(&solo_dev->gpio_dev, solo_dev);
176
177	if (ret) {
178		solo_dev->gpio_dev.label = NULL;
179		return -1;
180	}
181#endif
182	return 0;
183}
184
185void solo_gpio_exit(struct solo_dev *solo_dev)
186{
187#ifdef CONFIG_GPIOLIB
188	if (solo_dev->gpio_dev.label) {
189		gpiochip_remove(&solo_dev->gpio_dev);
190		solo_dev->gpio_dev.label = NULL;
191	}
192#endif
193	solo_gpio_clear(solo_dev, 0x30);
194	solo_gpio_config(solo_dev);
195}
196