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97fb5e8d | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
cd6484e1 RH |
2 | /* |
3 | * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org> | |
cd6484e1 RH |
4 | */ |
5 | #ifndef _LINUX_SERDEV_H | |
6 | #define _LINUX_SERDEV_H | |
7 | ||
8 | #include <linux/types.h> | |
9 | #include <linux/device.h> | |
96e82989 | 10 | #include <linux/iopoll.h> |
89bbeb7e | 11 | #include <linux/uaccess.h> |
5659dab2 | 12 | #include <linux/termios.h> |
756db778 | 13 | #include <linux/delay.h> |
cd6484e1 RH |
14 | |
15 | struct serdev_controller; | |
16 | struct serdev_device; | |
17 | ||
18 | /* | |
19 | * serdev device structures | |
20 | */ | |
21 | ||
22 | /** | |
23 | * struct serdev_device_ops - Callback operations for a serdev device | |
10f9e033 JH |
24 | * @receive_buf: Function called with data received from device; |
25 | * returns number of bytes accepted; may sleep. | |
26 | * @write_wakeup: Function called when ready to transmit more data; must | |
27 | * not sleep. | |
cd6484e1 RH |
28 | */ |
29 | struct serdev_device_ops { | |
30 | int (*receive_buf)(struct serdev_device *, const unsigned char *, size_t); | |
31 | void (*write_wakeup)(struct serdev_device *); | |
32 | }; | |
33 | ||
34 | /** | |
35 | * struct serdev_device - Basic representation of an serdev device | |
36 | * @dev: Driver model representation of the device. | |
37 | * @nr: Device number on serdev bus. | |
38 | * @ctrl: serdev controller managing this device. | |
39 | * @ops: Device operations. | |
6fe729c4 AS |
40 | * @write_comp Completion used by serdev_device_write() internally |
41 | * @write_lock Lock to serialize access when writing data | |
cd6484e1 RH |
42 | */ |
43 | struct serdev_device { | |
44 | struct device dev; | |
45 | int nr; | |
46 | struct serdev_controller *ctrl; | |
47 | const struct serdev_device_ops *ops; | |
6fe729c4 AS |
48 | struct completion write_comp; |
49 | struct mutex write_lock; | |
cd6484e1 RH |
50 | }; |
51 | ||
52 | static inline struct serdev_device *to_serdev_device(struct device *d) | |
53 | { | |
54 | return container_of(d, struct serdev_device, dev); | |
55 | } | |
56 | ||
57 | /** | |
58 | * struct serdev_device_driver - serdev slave device driver | |
59 | * @driver: serdev device drivers should initialize name field of this | |
60 | * structure. | |
61 | * @probe: binds this driver to a serdev device. | |
62 | * @remove: unbinds this driver from the serdev device. | |
63 | */ | |
64 | struct serdev_device_driver { | |
65 | struct device_driver driver; | |
66 | int (*probe)(struct serdev_device *); | |
67 | void (*remove)(struct serdev_device *); | |
68 | }; | |
69 | ||
70 | static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d) | |
71 | { | |
72 | return container_of(d, struct serdev_device_driver, driver); | |
73 | } | |
74 | ||
3a19cfcc UH |
75 | enum serdev_parity { |
76 | SERDEV_PARITY_NONE, | |
77 | SERDEV_PARITY_EVEN, | |
78 | SERDEV_PARITY_ODD, | |
79 | }; | |
80 | ||
cd6484e1 RH |
81 | /* |
82 | * serdev controller structures | |
83 | */ | |
84 | struct serdev_controller_ops { | |
85 | int (*write_buf)(struct serdev_controller *, const unsigned char *, size_t); | |
86 | void (*write_flush)(struct serdev_controller *); | |
87 | int (*write_room)(struct serdev_controller *); | |
88 | int (*open)(struct serdev_controller *); | |
89 | void (*close)(struct serdev_controller *); | |
90 | void (*set_flow_control)(struct serdev_controller *, bool); | |
3a19cfcc | 91 | int (*set_parity)(struct serdev_controller *, enum serdev_parity); |
cd6484e1 | 92 | unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int); |
b3f80c8f | 93 | void (*wait_until_sent)(struct serdev_controller *, long); |
5659dab2 SR |
94 | int (*get_tiocm)(struct serdev_controller *); |
95 | int (*set_tiocm)(struct serdev_controller *, unsigned int, unsigned int); | |
8eaf839e | 96 | int (*break_ctl)(struct serdev_controller *ctrl, unsigned int break_state); |
cd6484e1 RH |
97 | }; |
98 | ||
99 | /** | |
100 | * struct serdev_controller - interface to the serdev controller | |
101 | * @dev: Driver model representation of the device. | |
102 | * @nr: number identifier for this controller/bus. | |
103 | * @serdev: Pointer to slave device for this controller. | |
104 | * @ops: Controller operations. | |
105 | */ | |
106 | struct serdev_controller { | |
107 | struct device dev; | |
108 | unsigned int nr; | |
109 | struct serdev_device *serdev; | |
110 | const struct serdev_controller_ops *ops; | |
111 | }; | |
112 | ||
113 | static inline struct serdev_controller *to_serdev_controller(struct device *d) | |
114 | { | |
115 | return container_of(d, struct serdev_controller, dev); | |
116 | } | |
117 | ||
118 | static inline void *serdev_device_get_drvdata(const struct serdev_device *serdev) | |
119 | { | |
120 | return dev_get_drvdata(&serdev->dev); | |
121 | } | |
122 | ||
123 | static inline void serdev_device_set_drvdata(struct serdev_device *serdev, void *data) | |
124 | { | |
125 | dev_set_drvdata(&serdev->dev, data); | |
126 | } | |
127 | ||
128 | /** | |
129 | * serdev_device_put() - decrement serdev device refcount | |
130 | * @serdev serdev device. | |
131 | */ | |
132 | static inline void serdev_device_put(struct serdev_device *serdev) | |
133 | { | |
134 | if (serdev) | |
135 | put_device(&serdev->dev); | |
136 | } | |
137 | ||
138 | static inline void serdev_device_set_client_ops(struct serdev_device *serdev, | |
139 | const struct serdev_device_ops *ops) | |
140 | { | |
141 | serdev->ops = ops; | |
142 | } | |
143 | ||
144 | static inline | |
145 | void *serdev_controller_get_drvdata(const struct serdev_controller *ctrl) | |
146 | { | |
147 | return ctrl ? dev_get_drvdata(&ctrl->dev) : NULL; | |
148 | } | |
149 | ||
150 | static inline void serdev_controller_set_drvdata(struct serdev_controller *ctrl, | |
151 | void *data) | |
152 | { | |
153 | dev_set_drvdata(&ctrl->dev, data); | |
154 | } | |
155 | ||
156 | /** | |
157 | * serdev_controller_put() - decrement controller refcount | |
158 | * @ctrl serdev controller. | |
159 | */ | |
160 | static inline void serdev_controller_put(struct serdev_controller *ctrl) | |
161 | { | |
162 | if (ctrl) | |
163 | put_device(&ctrl->dev); | |
164 | } | |
165 | ||
166 | struct serdev_device *serdev_device_alloc(struct serdev_controller *); | |
167 | int serdev_device_add(struct serdev_device *); | |
168 | void serdev_device_remove(struct serdev_device *); | |
169 | ||
170 | struct serdev_controller *serdev_controller_alloc(struct device *, size_t); | |
171 | int serdev_controller_add(struct serdev_controller *); | |
172 | void serdev_controller_remove(struct serdev_controller *); | |
173 | ||
174 | static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl) | |
175 | { | |
176 | struct serdev_device *serdev = ctrl->serdev; | |
177 | ||
178 | if (!serdev || !serdev->ops->write_wakeup) | |
179 | return; | |
180 | ||
9d1d994d | 181 | serdev->ops->write_wakeup(serdev); |
cd6484e1 RH |
182 | } |
183 | ||
184 | static inline int serdev_controller_receive_buf(struct serdev_controller *ctrl, | |
185 | const unsigned char *data, | |
186 | size_t count) | |
187 | { | |
188 | struct serdev_device *serdev = ctrl->serdev; | |
189 | ||
190 | if (!serdev || !serdev->ops->receive_buf) | |
fd00cf81 | 191 | return 0; |
cd6484e1 | 192 | |
9d1d994d | 193 | return serdev->ops->receive_buf(serdev, data, count); |
cd6484e1 RH |
194 | } |
195 | ||
196 | #if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) | |
197 | ||
198 | int serdev_device_open(struct serdev_device *); | |
199 | void serdev_device_close(struct serdev_device *); | |
2cb67d20 | 200 | int devm_serdev_device_open(struct device *, struct serdev_device *); |
cd6484e1 RH |
201 | unsigned int serdev_device_set_baudrate(struct serdev_device *, unsigned int); |
202 | void serdev_device_set_flow_control(struct serdev_device *, bool); | |
6bdc00d0 | 203 | int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_t); |
b3f80c8f | 204 | void serdev_device_wait_until_sent(struct serdev_device *, long); |
5659dab2 SR |
205 | int serdev_device_get_tiocm(struct serdev_device *); |
206 | int serdev_device_set_tiocm(struct serdev_device *, int, int); | |
8eaf839e | 207 | int serdev_device_break_ctl(struct serdev_device *serdev, int break_state); |
6fe729c4 | 208 | void serdev_device_write_wakeup(struct serdev_device *); |
70d18804 | 209 | int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, long); |
cd6484e1 RH |
210 | void serdev_device_write_flush(struct serdev_device *); |
211 | int serdev_device_write_room(struct serdev_device *); | |
212 | ||
213 | /* | |
214 | * serdev device driver functions | |
215 | */ | |
216 | int __serdev_device_driver_register(struct serdev_device_driver *, struct module *); | |
217 | #define serdev_device_driver_register(sdrv) \ | |
218 | __serdev_device_driver_register(sdrv, THIS_MODULE) | |
219 | ||
220 | /** | |
221 | * serdev_device_driver_unregister() - unregister an serdev client driver | |
222 | * @sdrv: the driver to unregister | |
223 | */ | |
224 | static inline void serdev_device_driver_unregister(struct serdev_device_driver *sdrv) | |
225 | { | |
226 | if (sdrv) | |
227 | driver_unregister(&sdrv->driver); | |
228 | } | |
229 | ||
230 | #define module_serdev_device_driver(__serdev_device_driver) \ | |
231 | module_driver(__serdev_device_driver, serdev_device_driver_register, \ | |
232 | serdev_device_driver_unregister) | |
233 | ||
234 | #else | |
235 | ||
236 | static inline int serdev_device_open(struct serdev_device *sdev) | |
237 | { | |
238 | return -ENODEV; | |
239 | } | |
240 | static inline void serdev_device_close(struct serdev_device *sdev) {} | |
241 | static inline unsigned int serdev_device_set_baudrate(struct serdev_device *sdev, unsigned int baudrate) | |
242 | { | |
243 | return 0; | |
244 | } | |
245 | static inline void serdev_device_set_flow_control(struct serdev_device *sdev, bool enable) {} | |
6bdc00d0 SW |
246 | static inline int serdev_device_write_buf(struct serdev_device *serdev, |
247 | const unsigned char *buf, | |
248 | size_t count) | |
249 | { | |
250 | return -ENODEV; | |
251 | } | |
b3f80c8f | 252 | static inline void serdev_device_wait_until_sent(struct serdev_device *sdev, long timeout) {} |
5659dab2 SR |
253 | static inline int serdev_device_get_tiocm(struct serdev_device *serdev) |
254 | { | |
29f93a68 | 255 | return -EOPNOTSUPP; |
5659dab2 SR |
256 | } |
257 | static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear) | |
258 | { | |
29f93a68 | 259 | return -EOPNOTSUPP; |
5659dab2 | 260 | } |
8eaf839e NSK |
261 | static inline int serdev_device_break_ctl(struct serdev_device *serdev, int break_state) |
262 | { | |
263 | return -EOPNOTSUPP; | |
264 | } | |
6fe729c4 AS |
265 | static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf, |
266 | size_t count, unsigned long timeout) | |
cd6484e1 RH |
267 | { |
268 | return -ENODEV; | |
269 | } | |
270 | static inline void serdev_device_write_flush(struct serdev_device *sdev) {} | |
271 | static inline int serdev_device_write_room(struct serdev_device *sdev) | |
272 | { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | #define serdev_device_driver_register(x) | |
277 | #define serdev_device_driver_unregister(x) | |
278 | ||
279 | #endif /* CONFIG_SERIAL_DEV_BUS */ | |
280 | ||
756db778 SR |
281 | static inline bool serdev_device_get_cts(struct serdev_device *serdev) |
282 | { | |
283 | int status = serdev_device_get_tiocm(serdev); | |
284 | return !!(status & TIOCM_CTS); | |
285 | } | |
286 | ||
287 | static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms) | |
288 | { | |
756db778 SR |
289 | bool signal; |
290 | ||
96e82989 AS |
291 | return readx_poll_timeout(serdev_device_get_cts, serdev, signal, signal == state, |
292 | 2000, timeout_ms * 1000); | |
756db778 SR |
293 | } |
294 | ||
295 | static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enable) | |
296 | { | |
297 | if (enable) | |
298 | return serdev_device_set_tiocm(serdev, TIOCM_RTS, 0); | |
299 | else | |
300 | return serdev_device_set_tiocm(serdev, 0, TIOCM_RTS); | |
301 | } | |
302 | ||
3a19cfcc UH |
303 | int serdev_device_set_parity(struct serdev_device *serdev, |
304 | enum serdev_parity parity); | |
305 | ||
bed35c6d RH |
306 | /* |
307 | * serdev hooks into TTY core | |
308 | */ | |
309 | struct tty_port; | |
310 | struct tty_driver; | |
311 | ||
312 | #ifdef CONFIG_SERIAL_DEV_CTRL_TTYPORT | |
313 | struct device *serdev_tty_port_register(struct tty_port *port, | |
314 | struct device *parent, | |
315 | struct tty_driver *drv, int idx); | |
8cde11b2 | 316 | int serdev_tty_port_unregister(struct tty_port *port); |
bed35c6d RH |
317 | #else |
318 | static inline struct device *serdev_tty_port_register(struct tty_port *port, | |
319 | struct device *parent, | |
320 | struct tty_driver *drv, int idx) | |
321 | { | |
322 | return ERR_PTR(-ENODEV); | |
323 | } | |
8cde11b2 JH |
324 | static inline int serdev_tty_port_unregister(struct tty_port *port) |
325 | { | |
326 | return -ENODEV; | |
327 | } | |
bed35c6d RH |
328 | #endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */ |
329 | ||
0a732d7d AS |
330 | struct acpi_resource; |
331 | struct acpi_resource_uart_serialbus; | |
332 | ||
333 | #ifdef CONFIG_ACPI | |
334 | bool serdev_acpi_get_uart_resource(struct acpi_resource *ares, | |
335 | struct acpi_resource_uart_serialbus **uart); | |
336 | #else | |
337 | static inline bool serdev_acpi_get_uart_resource(struct acpi_resource *ares, | |
338 | struct acpi_resource_uart_serialbus **uart) | |
339 | { | |
340 | return false; | |
341 | } | |
342 | #endif /* CONFIG_ACPI */ | |
343 | ||
cd6484e1 | 344 | #endif /*_LINUX_SERDEV_H */ |