summaryrefslogtreecommitdiff
path: root/drivers/tty/serial/serial_mctrl_gpio.h
blob: bcfad5d1db61decf4f0262b5d702f03471ad6da1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
 * Helpers for controlling modem lines via GPIO
 *
 * Copyright (C) 2014 Paratronic S.A.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#ifndef __SERIAL_MCTRL_GPIO__
#define __SERIAL_MCTRL_GPIO__

#include <linux/err.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>

struct uart_port;

enum mctrl_gpio_idx {
	UART_GPIO_CTS,
	UART_GPIO_DSR,
	UART_GPIO_DCD,
	UART_GPIO_RNG,
	UART_GPIO_RI = UART_GPIO_RNG,
	UART_GPIO_RTS,
	UART_GPIO_DTR,
	UART_GPIO_OUT1,
	UART_GPIO_OUT2,
	UART_GPIO_MAX,
};

/*
 * Opaque descriptor for modem lines controlled by GPIOs
 */
struct mctrl_gpios;

#ifdef CONFIG_GPIOLIB

/*
 * Set state of the modem control output lines via GPIOs.
 */
void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl);

/*
 * Get state of the modem control output lines from GPIOs.
 * The mctrl flags are updated and returned.
 */
unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl);

/*
 * Returns the associated struct gpio_desc to the modem line gidx
 */
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
				      enum mctrl_gpio_idx gidx);

/*
 * Request and set direction of modem control line GPIOs and set up irq
 * handling.
 * devm_* functions are used, so there's no need to call mctrl_gpio_free().
 * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
 * allocation error.
 */
struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx);

/*
 * Request and set direction of modem control line GPIOs.
 * devm_* functions are used, so there's no need to call mctrl_gpio_free().
 * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on
 * allocation error.
 */
struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev,
					   unsigned int idx);

/*
 * Free the mctrl_gpios structure.
 * Normally, this function will not be called, as the GPIOs will
 * be disposed of by the resource management code.
 */
void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios);

/*
 * Enable gpio interrupts to report status line changes.
 */
void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios);

/*
 * Disable gpio interrupts to report status line changes.
 */
void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios);

#else /* GPIOLIB */

static inline
void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
{
}

static inline
unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
{
	return *mctrl;
}

static inline
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
				      enum mctrl_gpio_idx gidx)
{
	return ERR_PTR(-ENOSYS);
}

static inline
struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx)
{
	return ERR_PTR(-ENOSYS);
}

static inline
struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
{
	return ERR_PTR(-ENOSYS);
}

static inline
void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
{
}

static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios)
{
}

static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
{
}

#endif /* GPIOLIB */

#endif