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84130aac RG |
1 | /* |
2 | * Helpers for controlling modem lines via GPIO | |
3 | * | |
4 | * Copyright (C) 2014 Paratronic S.A. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | */ | |
17 | ||
18 | #ifndef __SERIAL_MCTRL_GPIO__ | |
19 | #define __SERIAL_MCTRL_GPIO__ | |
20 | ||
21 | #include <linux/err.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/gpio/consumer.h> | |
24 | ||
ce59e48f UKK |
25 | struct uart_port; |
26 | ||
84130aac RG |
27 | enum mctrl_gpio_idx { |
28 | UART_GPIO_CTS, | |
29 | UART_GPIO_DSR, | |
30 | UART_GPIO_DCD, | |
31 | UART_GPIO_RNG, | |
32 | UART_GPIO_RI = UART_GPIO_RNG, | |
33 | UART_GPIO_RTS, | |
34 | UART_GPIO_DTR, | |
35 | UART_GPIO_OUT1, | |
36 | UART_GPIO_OUT2, | |
37 | UART_GPIO_MAX, | |
38 | }; | |
39 | ||
40 | /* | |
41 | * Opaque descriptor for modem lines controlled by GPIOs | |
42 | */ | |
43 | struct mctrl_gpios; | |
44 | ||
45 | #ifdef CONFIG_GPIOLIB | |
46 | ||
47 | /* | |
48 | * Set state of the modem control output lines via GPIOs. | |
49 | */ | |
50 | void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl); | |
51 | ||
52 | /* | |
53 | * Get state of the modem control output lines from GPIOs. | |
54 | * The mctrl flags are updated and returned. | |
55 | */ | |
56 | unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl); | |
57 | ||
58 | /* | |
59 | * Returns the associated struct gpio_desc to the modem line gidx | |
60 | */ | |
61 | struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, | |
62 | enum mctrl_gpio_idx gidx); | |
63 | ||
ce59e48f UKK |
64 | /* |
65 | * Request and set direction of modem control lines GPIOs and sets up irq | |
66 | * handling. | |
67 | * devm_* functions are used, so there's no need to call mctrl_gpio_free(). | |
68 | * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on | |
69 | * allocation error. | |
70 | */ | |
71 | struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx); | |
72 | ||
84130aac RG |
73 | /* |
74 | * Request and set direction of modem control lines GPIOs. | |
75 | * devm_* functions are used, so there's no need to call mctrl_gpio_free(). | |
76 | * Returns a pointer to the allocated mctrl structure if ok, -ENOMEM on | |
77 | * allocation error. | |
78 | */ | |
7d8c70d8 UKK |
79 | struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, |
80 | unsigned int idx); | |
84130aac RG |
81 | |
82 | /* | |
83 | * Free the mctrl_gpios structure. | |
84 | * Normally, this function will not be called, as the GPIOs will | |
85 | * be disposed of by the resource management code. | |
86 | */ | |
87 | void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios); | |
88 | ||
ce59e48f UKK |
89 | /* |
90 | * Enable gpio interrupts to report status line changes. | |
91 | */ | |
92 | void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios); | |
93 | ||
94 | /* | |
95 | * Disable gpio interrupts to report status line changes. | |
96 | */ | |
97 | void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios); | |
98 | ||
84130aac RG |
99 | #else /* GPIOLIB */ |
100 | ||
101 | static inline | |
102 | void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl) | |
103 | { | |
104 | } | |
105 | ||
106 | static inline | |
107 | unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) | |
108 | { | |
109 | return *mctrl; | |
110 | } | |
111 | ||
112 | static inline | |
113 | struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, | |
114 | enum mctrl_gpio_idx gidx) | |
115 | { | |
116 | return ERR_PTR(-ENOSYS); | |
117 | } | |
118 | ||
ce59e48f UKK |
119 | static inline |
120 | struct mctrl_gpios *mctrl_gpio_init(struct uart_port *port, unsigned int idx) | |
121 | { | |
122 | return ERR_PTR(-ENOSYS); | |
123 | } | |
124 | ||
84130aac | 125 | static inline |
7d8c70d8 | 126 | struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx) |
84130aac RG |
127 | { |
128 | return ERR_PTR(-ENOSYS); | |
129 | } | |
130 | ||
131 | static inline | |
132 | void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios) | |
133 | { | |
134 | } | |
135 | ||
1b306f99 | 136 | static inline void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios) |
ce59e48f UKK |
137 | { |
138 | } | |
139 | ||
1b306f99 | 140 | static inline void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios) |
ce59e48f UKK |
141 | { |
142 | } | |
143 | ||
84130aac RG |
144 | #endif /* GPIOLIB */ |
145 | ||
146 | #endif |