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cd6484e1 RH |
1 | /* |
2 | * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 and | |
6 | * only version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | #ifndef _LINUX_SERDEV_H | |
14 | #define _LINUX_SERDEV_H | |
15 | ||
16 | #include <linux/types.h> | |
17 | #include <linux/device.h> | |
18 | ||
19 | struct serdev_controller; | |
20 | struct serdev_device; | |
21 | ||
22 | /* | |
23 | * serdev device structures | |
24 | */ | |
25 | ||
26 | /** | |
27 | * struct serdev_device_ops - Callback operations for a serdev device | |
28 | * @receive_buf: Function called with data received from device. | |
29 | * @write_wakeup: Function called when ready to transmit more data. | |
30 | */ | |
31 | struct serdev_device_ops { | |
32 | int (*receive_buf)(struct serdev_device *, const unsigned char *, size_t); | |
33 | void (*write_wakeup)(struct serdev_device *); | |
34 | }; | |
35 | ||
36 | /** | |
37 | * struct serdev_device - Basic representation of an serdev device | |
38 | * @dev: Driver model representation of the device. | |
39 | * @nr: Device number on serdev bus. | |
40 | * @ctrl: serdev controller managing this device. | |
41 | * @ops: Device operations. | |
42 | */ | |
43 | struct serdev_device { | |
44 | struct device dev; | |
45 | int nr; | |
46 | struct serdev_controller *ctrl; | |
47 | const struct serdev_device_ops *ops; | |
48 | }; | |
49 | ||
50 | static inline struct serdev_device *to_serdev_device(struct device *d) | |
51 | { | |
52 | return container_of(d, struct serdev_device, dev); | |
53 | } | |
54 | ||
55 | /** | |
56 | * struct serdev_device_driver - serdev slave device driver | |
57 | * @driver: serdev device drivers should initialize name field of this | |
58 | * structure. | |
59 | * @probe: binds this driver to a serdev device. | |
60 | * @remove: unbinds this driver from the serdev device. | |
61 | */ | |
62 | struct serdev_device_driver { | |
63 | struct device_driver driver; | |
64 | int (*probe)(struct serdev_device *); | |
65 | void (*remove)(struct serdev_device *); | |
66 | }; | |
67 | ||
68 | static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d) | |
69 | { | |
70 | return container_of(d, struct serdev_device_driver, driver); | |
71 | } | |
72 | ||
73 | /* | |
74 | * serdev controller structures | |
75 | */ | |
76 | struct serdev_controller_ops { | |
77 | int (*write_buf)(struct serdev_controller *, const unsigned char *, size_t); | |
78 | void (*write_flush)(struct serdev_controller *); | |
79 | int (*write_room)(struct serdev_controller *); | |
80 | int (*open)(struct serdev_controller *); | |
81 | void (*close)(struct serdev_controller *); | |
82 | void (*set_flow_control)(struct serdev_controller *, bool); | |
83 | unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int); | |
84 | }; | |
85 | ||
86 | /** | |
87 | * struct serdev_controller - interface to the serdev controller | |
88 | * @dev: Driver model representation of the device. | |
89 | * @nr: number identifier for this controller/bus. | |
90 | * @serdev: Pointer to slave device for this controller. | |
91 | * @ops: Controller operations. | |
92 | */ | |
93 | struct serdev_controller { | |
94 | struct device dev; | |
95 | unsigned int nr; | |
96 | struct serdev_device *serdev; | |
97 | const struct serdev_controller_ops *ops; | |
98 | }; | |
99 | ||
100 | static inline struct serdev_controller *to_serdev_controller(struct device *d) | |
101 | { | |
102 | return container_of(d, struct serdev_controller, dev); | |
103 | } | |
104 | ||
105 | static inline void *serdev_device_get_drvdata(const struct serdev_device *serdev) | |
106 | { | |
107 | return dev_get_drvdata(&serdev->dev); | |
108 | } | |
109 | ||
110 | static inline void serdev_device_set_drvdata(struct serdev_device *serdev, void *data) | |
111 | { | |
112 | dev_set_drvdata(&serdev->dev, data); | |
113 | } | |
114 | ||
115 | /** | |
116 | * serdev_device_put() - decrement serdev device refcount | |
117 | * @serdev serdev device. | |
118 | */ | |
119 | static inline void serdev_device_put(struct serdev_device *serdev) | |
120 | { | |
121 | if (serdev) | |
122 | put_device(&serdev->dev); | |
123 | } | |
124 | ||
125 | static inline void serdev_device_set_client_ops(struct serdev_device *serdev, | |
126 | const struct serdev_device_ops *ops) | |
127 | { | |
128 | serdev->ops = ops; | |
129 | } | |
130 | ||
131 | static inline | |
132 | void *serdev_controller_get_drvdata(const struct serdev_controller *ctrl) | |
133 | { | |
134 | return ctrl ? dev_get_drvdata(&ctrl->dev) : NULL; | |
135 | } | |
136 | ||
137 | static inline void serdev_controller_set_drvdata(struct serdev_controller *ctrl, | |
138 | void *data) | |
139 | { | |
140 | dev_set_drvdata(&ctrl->dev, data); | |
141 | } | |
142 | ||
143 | /** | |
144 | * serdev_controller_put() - decrement controller refcount | |
145 | * @ctrl serdev controller. | |
146 | */ | |
147 | static inline void serdev_controller_put(struct serdev_controller *ctrl) | |
148 | { | |
149 | if (ctrl) | |
150 | put_device(&ctrl->dev); | |
151 | } | |
152 | ||
153 | struct serdev_device *serdev_device_alloc(struct serdev_controller *); | |
154 | int serdev_device_add(struct serdev_device *); | |
155 | void serdev_device_remove(struct serdev_device *); | |
156 | ||
157 | struct serdev_controller *serdev_controller_alloc(struct device *, size_t); | |
158 | int serdev_controller_add(struct serdev_controller *); | |
159 | void serdev_controller_remove(struct serdev_controller *); | |
160 | ||
161 | static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl) | |
162 | { | |
163 | struct serdev_device *serdev = ctrl->serdev; | |
164 | ||
165 | if (!serdev || !serdev->ops->write_wakeup) | |
166 | return; | |
167 | ||
9d1d994d | 168 | serdev->ops->write_wakeup(serdev); |
cd6484e1 RH |
169 | } |
170 | ||
171 | static inline int serdev_controller_receive_buf(struct serdev_controller *ctrl, | |
172 | const unsigned char *data, | |
173 | size_t count) | |
174 | { | |
175 | struct serdev_device *serdev = ctrl->serdev; | |
176 | ||
177 | if (!serdev || !serdev->ops->receive_buf) | |
178 | return -EINVAL; | |
179 | ||
9d1d994d | 180 | return serdev->ops->receive_buf(serdev, data, count); |
cd6484e1 RH |
181 | } |
182 | ||
183 | #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) | |
184 | ||
185 | int serdev_device_open(struct serdev_device *); | |
186 | void serdev_device_close(struct serdev_device *); | |
187 | unsigned int serdev_device_set_baudrate(struct serdev_device *, unsigned int); | |
188 | void serdev_device_set_flow_control(struct serdev_device *, bool); | |
189 | int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_t); | |
190 | void serdev_device_write_flush(struct serdev_device *); | |
191 | int serdev_device_write_room(struct serdev_device *); | |
192 | ||
193 | /* | |
194 | * serdev device driver functions | |
195 | */ | |
196 | int __serdev_device_driver_register(struct serdev_device_driver *, struct module *); | |
197 | #define serdev_device_driver_register(sdrv) \ | |
198 | __serdev_device_driver_register(sdrv, THIS_MODULE) | |
199 | ||
200 | /** | |
201 | * serdev_device_driver_unregister() - unregister an serdev client driver | |
202 | * @sdrv: the driver to unregister | |
203 | */ | |
204 | static inline void serdev_device_driver_unregister(struct serdev_device_driver *sdrv) | |
205 | { | |
206 | if (sdrv) | |
207 | driver_unregister(&sdrv->driver); | |
208 | } | |
209 | ||
210 | #define module_serdev_device_driver(__serdev_device_driver) \ | |
211 | module_driver(__serdev_device_driver, serdev_device_driver_register, \ | |
212 | serdev_device_driver_unregister) | |
213 | ||
214 | #else | |
215 | ||
216 | static inline int serdev_device_open(struct serdev_device *sdev) | |
217 | { | |
218 | return -ENODEV; | |
219 | } | |
220 | static inline void serdev_device_close(struct serdev_device *sdev) {} | |
221 | static inline unsigned int serdev_device_set_baudrate(struct serdev_device *sdev, unsigned int baudrate) | |
222 | { | |
223 | return 0; | |
224 | } | |
225 | static inline void serdev_device_set_flow_control(struct serdev_device *sdev, bool enable) {} | |
226 | static inline int serdev_device_write_buf(struct serdev_device *sdev, const unsigned char *buf, size_t count) | |
227 | { | |
228 | return -ENODEV; | |
229 | } | |
230 | static inline void serdev_device_write_flush(struct serdev_device *sdev) {} | |
231 | static inline int serdev_device_write_room(struct serdev_device *sdev) | |
232 | { | |
233 | return 0; | |
234 | } | |
235 | ||
236 | #define serdev_device_driver_register(x) | |
237 | #define serdev_device_driver_unregister(x) | |
238 | ||
239 | #endif /* CONFIG_SERIAL_DEV_BUS */ | |
240 | ||
bed35c6d RH |
241 | /* |
242 | * serdev hooks into TTY core | |
243 | */ | |
244 | struct tty_port; | |
245 | struct tty_driver; | |
246 | ||
247 | #ifdef CONFIG_SERIAL_DEV_CTRL_TTYPORT | |
248 | struct device *serdev_tty_port_register(struct tty_port *port, | |
249 | struct device *parent, | |
250 | struct tty_driver *drv, int idx); | |
251 | void serdev_tty_port_unregister(struct tty_port *port); | |
252 | #else | |
253 | static inline struct device *serdev_tty_port_register(struct tty_port *port, | |
254 | struct device *parent, | |
255 | struct tty_driver *drv, int idx) | |
256 | { | |
257 | return ERR_PTR(-ENODEV); | |
258 | } | |
259 | static inline void serdev_tty_port_unregister(struct tty_port *port) {} | |
260 | #endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */ | |
261 | ||
cd6484e1 | 262 | #endif /*_LINUX_SERDEV_H */ |