1 | // SPDX-License-Identifier: GPL-2.0-only |
---|---|
2 | /* |
3 | * ds2482.c - provides i2c to w1-master bridge(s) |
4 | * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> |
5 | * |
6 | * The DS2482 is a sensor chip made by Dallas Semiconductor (Maxim). |
7 | * It is a I2C to 1-wire bridge. |
8 | * There are two variations: -100 and -800, which have 1 or 8 1-wire ports. |
9 | * The complete datasheet can be obtained from MAXIM's website at: |
10 | * https://www.analog.com/en/products/ds2482-100.html |
11 | */ |
12 | |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/i2c.h> |
17 | #include <linux/delay.h> |
18 | #include <linux/regulator/consumer.h> |
19 | |
20 | #include <linux/w1.h> |
21 | |
22 | /* |
23 | * Allow the active pullup to be disabled, default is enabled. |
24 | * |
25 | * Note from the DS2482 datasheet: |
26 | * The APU bit controls whether an active pullup (controlled slew-rate |
27 | * transistor) or a passive pullup (Rwpu resistor) will be used to drive |
28 | * a 1-Wire line from low to high. When APU = 0, active pullup is disabled |
29 | * (resistor mode). Active Pullup should always be selected unless there is |
30 | * only a single slave on the 1-Wire line. |
31 | */ |
32 | static int ds2482_active_pullup = 1; |
33 | module_param_named(active_pullup, ds2482_active_pullup, int, 0644); |
34 | MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): "\ |
35 | "0-disable, 1-enable (default)"); |
36 | |
37 | /* extra configurations - e.g. 1WS */ |
38 | static int extra_config; |
39 | module_param(extra_config, int, 0644); |
40 | MODULE_PARM_DESC(extra_config, "Extra Configuration settings 1=APU,2=PPM,3=SPU,8=1WS"); |
41 | |
42 | /* |
43 | * The DS2482 registers - there are 3 registers that are addressed by a read |
44 | * pointer. The read pointer is set by the last command executed. |
45 | * |
46 | * To read the data, issue a register read for any address |
47 | */ |
48 | #define DS2482_CMD_RESET 0xF0 /* No param */ |
49 | #define DS2482_CMD_SET_READ_PTR 0xE1 /* Param: DS2482_PTR_CODE_xxx */ |
50 | #define DS2482_CMD_CHANNEL_SELECT 0xC3 /* Param: Channel byte - DS2482-800 only */ |
51 | #define DS2482_CMD_WRITE_CONFIG 0xD2 /* Param: Config byte */ |
52 | #define DS2482_CMD_1WIRE_RESET 0xB4 /* Param: None */ |
53 | #define DS2482_CMD_1WIRE_SINGLE_BIT 0x87 /* Param: Bit byte (bit7) */ |
54 | #define DS2482_CMD_1WIRE_WRITE_BYTE 0xA5 /* Param: Data byte */ |
55 | #define DS2482_CMD_1WIRE_READ_BYTE 0x96 /* Param: None */ |
56 | /* Note to read the byte, Set the ReadPtr to Data then read (any addr) */ |
57 | #define DS2482_CMD_1WIRE_TRIPLET 0x78 /* Param: Dir byte (bit7) */ |
58 | |
59 | /* Values for DS2482_CMD_SET_READ_PTR */ |
60 | #define DS2482_PTR_CODE_STATUS 0xF0 |
61 | #define DS2482_PTR_CODE_DATA 0xE1 |
62 | #define DS2482_PTR_CODE_CHANNEL 0xD2 /* DS2482-800 only */ |
63 | #define DS2482_PTR_CODE_CONFIG 0xC3 |
64 | |
65 | /* |
66 | * Configure Register bit definitions |
67 | * The top 4 bits always read 0. |
68 | * To write, the top nibble must be the 1's compl. of the low nibble. |
69 | */ |
70 | #define DS2482_REG_CFG_1WS 0x08 /* 1-wire speed */ |
71 | #define DS2482_REG_CFG_SPU 0x04 /* strong pull-up */ |
72 | #define DS2482_REG_CFG_PPM 0x02 /* presence pulse masking */ |
73 | #define DS2482_REG_CFG_APU 0x01 /* active pull-up */ |
74 | |
75 | |
76 | /* |
77 | * Write and verify codes for the CHANNEL_SELECT command (DS2482-800 only). |
78 | * To set the channel, write the value at the index of the channel. |
79 | * Read and compare against the corresponding value to verify the change. |
80 | */ |
81 | static const u8 ds2482_chan_wr[8] = { 0xF0, 0xE1, 0xD2, 0xC3, 0xB4, 0xA5, 0x96, 0x87 }; |
82 | static const u8 ds2482_chan_rd[8] = { 0xB8, 0xB1, 0xAA, 0xA3, 0x9C, 0x95, 0x8E, 0x87 }; |
83 | |
84 | |
85 | /* |
86 | * Status Register bit definitions (read only) |
87 | */ |
88 | #define DS2482_REG_STS_DIR 0x80 |
89 | #define DS2482_REG_STS_TSB 0x40 |
90 | #define DS2482_REG_STS_SBR 0x20 |
91 | #define DS2482_REG_STS_RST 0x10 |
92 | #define DS2482_REG_STS_LL 0x08 |
93 | #define DS2482_REG_STS_SD 0x04 |
94 | #define DS2482_REG_STS_PPD 0x02 |
95 | #define DS2482_REG_STS_1WB 0x01 |
96 | |
97 | /* |
98 | * Client data (each client gets its own) |
99 | */ |
100 | |
101 | struct ds2482_data; |
102 | |
103 | struct ds2482_w1_chan { |
104 | struct ds2482_data *pdev; |
105 | u8 channel; |
106 | struct w1_bus_master w1_bm; |
107 | }; |
108 | |
109 | struct ds2482_data { |
110 | struct i2c_client *client; |
111 | struct mutex access_lock; |
112 | |
113 | /* 1-wire interface(s) */ |
114 | int w1_count; /* 1 or 8 */ |
115 | struct ds2482_w1_chan w1_ch[8]; |
116 | |
117 | /* per-device values */ |
118 | u8 channel; |
119 | u8 read_prt; /* see DS2482_PTR_CODE_xxx */ |
120 | u8 reg_config; |
121 | }; |
122 | |
123 | |
124 | /** |
125 | * ds2482_calculate_config - Helper to calculate values for configuration register |
126 | * @conf: the raw config value |
127 | * Return: the value w/ complements that can be written to register |
128 | */ |
129 | static inline u8 ds2482_calculate_config(u8 conf) |
130 | { |
131 | conf |= extra_config; |
132 | |
133 | if (ds2482_active_pullup) |
134 | conf |= DS2482_REG_CFG_APU; |
135 | |
136 | return conf | ((~conf & 0x0f) << 4); |
137 | } |
138 | |
139 | |
140 | /** |
141 | * ds2482_select_register - Sets the read pointer. |
142 | * @pdev: The ds2482 client pointer |
143 | * @read_ptr: see DS2482_PTR_CODE_xxx above |
144 | * Return: -1 on failure, 0 on success |
145 | */ |
146 | static inline int ds2482_select_register(struct ds2482_data *pdev, u8 read_ptr) |
147 | { |
148 | if (pdev->read_prt != read_ptr) { |
149 | if (i2c_smbus_write_byte_data(client: pdev->client, |
150 | DS2482_CMD_SET_READ_PTR, |
151 | value: read_ptr) < 0) |
152 | return -1; |
153 | |
154 | pdev->read_prt = read_ptr; |
155 | } |
156 | return 0; |
157 | } |
158 | |
159 | /** |
160 | * ds2482_send_cmd - Sends a command without a parameter |
161 | * @pdev: The ds2482 client pointer |
162 | * @cmd: DS2482_CMD_RESET, |
163 | * DS2482_CMD_1WIRE_RESET, |
164 | * DS2482_CMD_1WIRE_READ_BYTE |
165 | * Return: -1 on failure, 0 on success |
166 | */ |
167 | static inline int ds2482_send_cmd(struct ds2482_data *pdev, u8 cmd) |
168 | { |
169 | if (i2c_smbus_write_byte(client: pdev->client, value: cmd) < 0) |
170 | return -1; |
171 | |
172 | pdev->read_prt = DS2482_PTR_CODE_STATUS; |
173 | return 0; |
174 | } |
175 | |
176 | /** |
177 | * ds2482_send_cmd_data - Sends a command with a parameter |
178 | * @pdev: The ds2482 client pointer |
179 | * @cmd: DS2482_CMD_WRITE_CONFIG, |
180 | * DS2482_CMD_1WIRE_SINGLE_BIT, |
181 | * DS2482_CMD_1WIRE_WRITE_BYTE, |
182 | * DS2482_CMD_1WIRE_TRIPLET |
183 | * @byte: The data to send |
184 | * Return: -1 on failure, 0 on success |
185 | */ |
186 | static inline int ds2482_send_cmd_data(struct ds2482_data *pdev, |
187 | u8 cmd, u8 byte) |
188 | { |
189 | if (i2c_smbus_write_byte_data(client: pdev->client, command: cmd, value: byte) < 0) |
190 | return -1; |
191 | |
192 | /* all cmds leave in STATUS, except CONFIG */ |
193 | pdev->read_prt = (cmd != DS2482_CMD_WRITE_CONFIG) ? |
194 | DS2482_PTR_CODE_STATUS : DS2482_PTR_CODE_CONFIG; |
195 | return 0; |
196 | } |
197 | |
198 | |
199 | /* |
200 | * 1-Wire interface code |
201 | */ |
202 | |
203 | #define DS2482_WAIT_IDLE_TIMEOUT 100 |
204 | |
205 | /** |
206 | * ds2482_wait_1wire_idle - Waits until the 1-wire interface is idle (not busy) |
207 | * |
208 | * @pdev: Pointer to the device structure |
209 | * Return: the last value read from status or -1 (failure) |
210 | */ |
211 | static int ds2482_wait_1wire_idle(struct ds2482_data *pdev) |
212 | { |
213 | int temp = -1; |
214 | int retries = 0; |
215 | |
216 | if (!ds2482_select_register(pdev, DS2482_PTR_CODE_STATUS)) { |
217 | do { |
218 | temp = i2c_smbus_read_byte(client: pdev->client); |
219 | } while ((temp >= 0) && (temp & DS2482_REG_STS_1WB) && |
220 | (++retries < DS2482_WAIT_IDLE_TIMEOUT)); |
221 | } |
222 | |
223 | if (retries >= DS2482_WAIT_IDLE_TIMEOUT) |
224 | pr_err("%s: timeout on channel %d\n", |
225 | __func__, pdev->channel); |
226 | |
227 | return temp; |
228 | } |
229 | |
230 | /** |
231 | * ds2482_set_channel - Selects a w1 channel. |
232 | * The 1-wire interface must be idle before calling this function. |
233 | * |
234 | * @pdev: The ds2482 client pointer |
235 | * @channel: 0-7 |
236 | * Return: -1 (failure) or 0 (success) |
237 | */ |
238 | static int ds2482_set_channel(struct ds2482_data *pdev, u8 channel) |
239 | { |
240 | if (i2c_smbus_write_byte_data(client: pdev->client, DS2482_CMD_CHANNEL_SELECT, |
241 | value: ds2482_chan_wr[channel]) < 0) |
242 | return -1; |
243 | |
244 | pdev->read_prt = DS2482_PTR_CODE_CHANNEL; |
245 | pdev->channel = -1; |
246 | if (i2c_smbus_read_byte(client: pdev->client) == ds2482_chan_rd[channel]) { |
247 | pdev->channel = channel; |
248 | return 0; |
249 | } |
250 | return -1; |
251 | } |
252 | |
253 | |
254 | /** |
255 | * ds2482_w1_touch_bit - Performs the touch-bit function, which writes a 0 or 1 and reads the level. |
256 | * |
257 | * @data: The ds2482 channel pointer |
258 | * @bit: The level to write: 0 or non-zero |
259 | * Return: The level read: 0 or 1 |
260 | */ |
261 | static u8 ds2482_w1_touch_bit(void *data, u8 bit) |
262 | { |
263 | struct ds2482_w1_chan *pchan = data; |
264 | struct ds2482_data *pdev = pchan->pdev; |
265 | int status = -1; |
266 | |
267 | mutex_lock(&pdev->access_lock); |
268 | |
269 | /* Select the channel */ |
270 | ds2482_wait_1wire_idle(pdev); |
271 | if (pdev->w1_count > 1) |
272 | ds2482_set_channel(pdev, channel: pchan->channel); |
273 | |
274 | /* Send the touch command, wait until 1WB == 0, return the status */ |
275 | if (!ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_SINGLE_BIT, |
276 | byte: bit ? 0xFF : 0)) |
277 | status = ds2482_wait_1wire_idle(pdev); |
278 | |
279 | mutex_unlock(lock: &pdev->access_lock); |
280 | |
281 | return (status & DS2482_REG_STS_SBR) ? 1 : 0; |
282 | } |
283 | |
284 | /** |
285 | * ds2482_w1_triplet - Performs the triplet function, which reads two bits and writes a bit. |
286 | * The bit written is determined by the two reads: |
287 | * 00 => dbit, 01 => 0, 10 => 1 |
288 | * |
289 | * @data: The ds2482 channel pointer |
290 | * @dbit: The direction to choose if both branches are valid |
291 | * Return: b0=read1 b1=read2 b3=bit written |
292 | */ |
293 | static u8 ds2482_w1_triplet(void *data, u8 dbit) |
294 | { |
295 | struct ds2482_w1_chan *pchan = data; |
296 | struct ds2482_data *pdev = pchan->pdev; |
297 | int status = (3 << 5); |
298 | |
299 | mutex_lock(&pdev->access_lock); |
300 | |
301 | /* Select the channel */ |
302 | ds2482_wait_1wire_idle(pdev); |
303 | if (pdev->w1_count > 1) |
304 | ds2482_set_channel(pdev, channel: pchan->channel); |
305 | |
306 | /* Send the triplet command, wait until 1WB == 0, return the status */ |
307 | if (!ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_TRIPLET, |
308 | byte: dbit ? 0xFF : 0)) |
309 | status = ds2482_wait_1wire_idle(pdev); |
310 | |
311 | mutex_unlock(lock: &pdev->access_lock); |
312 | |
313 | /* Decode the status */ |
314 | return (status >> 5); |
315 | } |
316 | |
317 | /** |
318 | * ds2482_w1_write_byte - Performs the write byte function. |
319 | * |
320 | * @data: The ds2482 channel pointer |
321 | * @byte: The value to write |
322 | */ |
323 | static void ds2482_w1_write_byte(void *data, u8 byte) |
324 | { |
325 | struct ds2482_w1_chan *pchan = data; |
326 | struct ds2482_data *pdev = pchan->pdev; |
327 | |
328 | mutex_lock(&pdev->access_lock); |
329 | |
330 | /* Select the channel */ |
331 | ds2482_wait_1wire_idle(pdev); |
332 | if (pdev->w1_count > 1) |
333 | ds2482_set_channel(pdev, channel: pchan->channel); |
334 | |
335 | /* Send the write byte command */ |
336 | ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_WRITE_BYTE, byte); |
337 | |
338 | mutex_unlock(lock: &pdev->access_lock); |
339 | } |
340 | |
341 | /** |
342 | * ds2482_w1_read_byte - Performs the read byte function. |
343 | * |
344 | * @data: The ds2482 channel pointer |
345 | * Return: The value read |
346 | */ |
347 | static u8 ds2482_w1_read_byte(void *data) |
348 | { |
349 | struct ds2482_w1_chan *pchan = data; |
350 | struct ds2482_data *pdev = pchan->pdev; |
351 | int result; |
352 | |
353 | mutex_lock(&pdev->access_lock); |
354 | |
355 | /* Select the channel */ |
356 | ds2482_wait_1wire_idle(pdev); |
357 | if (pdev->w1_count > 1) |
358 | ds2482_set_channel(pdev, channel: pchan->channel); |
359 | |
360 | /* Send the read byte command */ |
361 | ds2482_send_cmd(pdev, DS2482_CMD_1WIRE_READ_BYTE); |
362 | |
363 | /* Wait until 1WB == 0 */ |
364 | ds2482_wait_1wire_idle(pdev); |
365 | |
366 | /* Select the data register */ |
367 | ds2482_select_register(pdev, DS2482_PTR_CODE_DATA); |
368 | |
369 | /* Read the data byte */ |
370 | result = i2c_smbus_read_byte(client: pdev->client); |
371 | |
372 | mutex_unlock(lock: &pdev->access_lock); |
373 | |
374 | return result; |
375 | } |
376 | |
377 | |
378 | /** |
379 | * ds2482_w1_reset_bus - Sends a reset on the 1-wire interface |
380 | * |
381 | * @data: The ds2482 channel pointer |
382 | * Return: 0=Device present, 1=No device present or error |
383 | */ |
384 | static u8 ds2482_w1_reset_bus(void *data) |
385 | { |
386 | struct ds2482_w1_chan *pchan = data; |
387 | struct ds2482_data *pdev = pchan->pdev; |
388 | int err; |
389 | u8 retval = 1; |
390 | |
391 | mutex_lock(&pdev->access_lock); |
392 | |
393 | /* Select the channel */ |
394 | ds2482_wait_1wire_idle(pdev); |
395 | if (pdev->w1_count > 1) |
396 | ds2482_set_channel(pdev, channel: pchan->channel); |
397 | |
398 | /* Send the reset command */ |
399 | err = ds2482_send_cmd(pdev, DS2482_CMD_1WIRE_RESET); |
400 | if (err >= 0) { |
401 | /* Wait until the reset is complete */ |
402 | err = ds2482_wait_1wire_idle(pdev); |
403 | retval = !(err & DS2482_REG_STS_PPD); |
404 | |
405 | /* If the chip did reset since detect, re-config it */ |
406 | if (err & DS2482_REG_STS_RST) |
407 | ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, |
408 | byte: ds2482_calculate_config(conf: 0x00)); |
409 | } |
410 | |
411 | mutex_unlock(lock: &pdev->access_lock); |
412 | |
413 | return retval; |
414 | } |
415 | |
416 | static u8 ds2482_w1_set_pullup(void *data, int delay) |
417 | { |
418 | struct ds2482_w1_chan *pchan = data; |
419 | struct ds2482_data *pdev = pchan->pdev; |
420 | u8 retval = 1; |
421 | |
422 | /* if delay is non-zero activate the pullup, |
423 | * the strong pullup will be automatically deactivated |
424 | * by the master, so do not explicitly deactive it |
425 | */ |
426 | if (delay) { |
427 | /* both waits are crucial, otherwise devices might not be |
428 | * powered long enough, causing e.g. a w1_therm sensor to |
429 | * provide wrong conversion results |
430 | */ |
431 | ds2482_wait_1wire_idle(pdev); |
432 | /* note: it seems like both SPU and APU have to be set! */ |
433 | retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, |
434 | byte: ds2482_calculate_config(DS2482_REG_CFG_SPU | |
435 | DS2482_REG_CFG_APU)); |
436 | ds2482_wait_1wire_idle(pdev); |
437 | } |
438 | |
439 | return retval; |
440 | } |
441 | |
442 | |
443 | static int ds2482_probe(struct i2c_client *client) |
444 | { |
445 | struct ds2482_data *data; |
446 | int err = -ENODEV; |
447 | int temp1; |
448 | int idx; |
449 | int ret; |
450 | |
451 | if (!i2c_check_functionality(adap: client->adapter, |
452 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | |
453 | I2C_FUNC_SMBUS_BYTE)) |
454 | return -ENODEV; |
455 | |
456 | data = devm_kzalloc(dev: &client->dev, size: sizeof(struct ds2482_data), GFP_KERNEL); |
457 | if (!data) |
458 | return -ENOMEM; |
459 | |
460 | ret = devm_regulator_get_enable(dev: &client->dev, id: "vcc"); |
461 | if (ret) |
462 | return dev_err_probe(dev: &client->dev, err: ret, fmt: "Failed to enable regulator\n"); |
463 | |
464 | data->client = client; |
465 | i2c_set_clientdata(client, data); |
466 | |
467 | /* Reset the device (sets the read_ptr to status) */ |
468 | if (ds2482_send_cmd(pdev: data, DS2482_CMD_RESET) < 0) { |
469 | dev_warn(&client->dev, "DS2482 reset failed.\n"); |
470 | return err; |
471 | } |
472 | |
473 | /* Sleep at least 525ns to allow the reset to complete */ |
474 | ndelay(525); |
475 | |
476 | /* Read the status byte - only reset bit and line should be set */ |
477 | temp1 = i2c_smbus_read_byte(client); |
478 | if (temp1 != (DS2482_REG_STS_LL | DS2482_REG_STS_RST)) { |
479 | dev_warn(&client->dev, "DS2482 reset status " |
480 | "0x%02X - not a DS2482\n", temp1); |
481 | return err; |
482 | } |
483 | |
484 | /* Detect the 8-port version */ |
485 | data->w1_count = 1; |
486 | if (ds2482_set_channel(pdev: data, channel: 7) == 0) |
487 | data->w1_count = 8; |
488 | |
489 | /* Set all config items to 0 (off) */ |
490 | ds2482_send_cmd_data(pdev: data, DS2482_CMD_WRITE_CONFIG, |
491 | byte: ds2482_calculate_config(conf: 0x00)); |
492 | |
493 | mutex_init(&data->access_lock); |
494 | |
495 | /* Register 1-wire interface(s) */ |
496 | for (idx = 0; idx < data->w1_count; idx++) { |
497 | data->w1_ch[idx].pdev = data; |
498 | data->w1_ch[idx].channel = idx; |
499 | |
500 | /* Populate all the w1 bus master stuff */ |
501 | data->w1_ch[idx].w1_bm.data = &data->w1_ch[idx]; |
502 | data->w1_ch[idx].w1_bm.read_byte = ds2482_w1_read_byte; |
503 | data->w1_ch[idx].w1_bm.write_byte = ds2482_w1_write_byte; |
504 | data->w1_ch[idx].w1_bm.touch_bit = ds2482_w1_touch_bit; |
505 | data->w1_ch[idx].w1_bm.triplet = ds2482_w1_triplet; |
506 | data->w1_ch[idx].w1_bm.reset_bus = ds2482_w1_reset_bus; |
507 | data->w1_ch[idx].w1_bm.set_pullup = ds2482_w1_set_pullup; |
508 | |
509 | err = w1_add_master_device(master: &data->w1_ch[idx].w1_bm); |
510 | if (err) { |
511 | data->w1_ch[idx].pdev = NULL; |
512 | goto exit_w1_remove; |
513 | } |
514 | } |
515 | |
516 | return 0; |
517 | |
518 | exit_w1_remove: |
519 | for (idx = 0; idx < data->w1_count; idx++) { |
520 | if (data->w1_ch[idx].pdev != NULL) |
521 | w1_remove_master_device(master: &data->w1_ch[idx].w1_bm); |
522 | } |
523 | return err; |
524 | } |
525 | |
526 | static void ds2482_remove(struct i2c_client *client) |
527 | { |
528 | struct ds2482_data *data = i2c_get_clientdata(client); |
529 | int idx; |
530 | |
531 | /* Unregister the 1-wire bridge(s) */ |
532 | for (idx = 0; idx < data->w1_count; idx++) { |
533 | if (data->w1_ch[idx].pdev != NULL) |
534 | w1_remove_master_device(master: &data->w1_ch[idx].w1_bm); |
535 | } |
536 | } |
537 | |
538 | /* |
539 | * Driver data (common to all clients) |
540 | */ |
541 | static const struct i2c_device_id ds2482_id[] = { |
542 | { "ds2482"}, |
543 | { "ds2484"}, |
544 | { } |
545 | }; |
546 | MODULE_DEVICE_TABLE(i2c, ds2482_id); |
547 | |
548 | static struct i2c_driver ds2482_driver = { |
549 | .driver = { |
550 | .name = "ds2482", |
551 | }, |
552 | .probe = ds2482_probe, |
553 | .remove = ds2482_remove, |
554 | .id_table = ds2482_id, |
555 | }; |
556 | module_i2c_driver(ds2482_driver); |
557 | |
558 | MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>"); |
559 | MODULE_DESCRIPTION("DS2482 driver"); |
560 | |
561 | MODULE_LICENSE("GPL"); |
562 |
Definitions
- ds2482_active_pullup
- extra_config
- ds2482_chan_wr
- ds2482_chan_rd
- ds2482_w1_chan
- ds2482_data
- ds2482_calculate_config
- ds2482_select_register
- ds2482_send_cmd
- ds2482_send_cmd_data
- ds2482_wait_1wire_idle
- ds2482_set_channel
- ds2482_w1_touch_bit
- ds2482_w1_triplet
- ds2482_w1_write_byte
- ds2482_w1_read_byte
- ds2482_w1_reset_bus
- ds2482_w1_set_pullup
- ds2482_probe
- ds2482_remove
- ds2482_id
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