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}