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baf12ae2 EP |
1 | /** |
2 | * ds2482.c - provides i2c to w1-master bridge(s) | |
3 | * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> | |
4 | * | |
5 | * The DS2482 is a sensor chip made by Dallas Semiconductor (Maxim). | |
6 | * It is a I2C to 1-wire bridge. | |
7 | * There are two variations: -100 and -800, which have 1 or 8 1-wire ports. | |
8 | * The complete datasheet can be obtained from MAXIM's website at: | |
9 | * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4382 | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; version 2 of the License. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/delay.h> | |
21 | #include <asm/delay.h> | |
22 | ||
de0d6dbd | 23 | #include <linux/w1.h> |
baf12ae2 | 24 | |
f704938c MB |
25 | /** |
26 | * Allow the active pullup to be disabled, default is enabled. | |
27 | * | |
28 | * Note from the DS2482 datasheet: | |
29 | * The APU bit controls whether an active pullup (controlled slew-rate | |
30 | * transistor) or a passive pullup (Rwpu resistor) will be used to drive | |
31 | * a 1-Wire line from low to high. When APU = 0, active pullup is disabled | |
32 | * (resistor mode). Active Pullup should always be selected unless there is | |
33 | * only a single slave on the 1-Wire line. | |
34 | */ | |
35 | static int ds2482_active_pullup = 1; | |
36 | module_param_named(active_pullup, ds2482_active_pullup, int, 0644); | |
50fa2951 AD |
37 | MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): " \ |
38 | "0-disable, 1-enable (default)"); | |
f704938c | 39 | |
baf12ae2 EP |
40 | /** |
41 | * The DS2482 registers - there are 3 registers that are addressed by a read | |
42 | * pointer. The read pointer is set by the last command executed. | |
43 | * | |
44 | * To read the data, issue a register read for any address | |
45 | */ | |
46 | #define DS2482_CMD_RESET 0xF0 /* No param */ | |
47 | #define DS2482_CMD_SET_READ_PTR 0xE1 /* Param: DS2482_PTR_CODE_xxx */ | |
48 | #define DS2482_CMD_CHANNEL_SELECT 0xC3 /* Param: Channel byte - DS2482-800 only */ | |
49 | #define DS2482_CMD_WRITE_CONFIG 0xD2 /* Param: Config byte */ | |
50 | #define DS2482_CMD_1WIRE_RESET 0xB4 /* Param: None */ | |
51 | #define DS2482_CMD_1WIRE_SINGLE_BIT 0x87 /* Param: Bit byte (bit7) */ | |
52 | #define DS2482_CMD_1WIRE_WRITE_BYTE 0xA5 /* Param: Data byte */ | |
53 | #define DS2482_CMD_1WIRE_READ_BYTE 0x96 /* Param: None */ | |
54 | /* Note to read the byte, Set the ReadPtr to Data then read (any addr) */ | |
55 | #define DS2482_CMD_1WIRE_TRIPLET 0x78 /* Param: Dir byte (bit7) */ | |
56 | ||
57 | /* Values for DS2482_CMD_SET_READ_PTR */ | |
58 | #define DS2482_PTR_CODE_STATUS 0xF0 | |
59 | #define DS2482_PTR_CODE_DATA 0xE1 | |
60 | #define DS2482_PTR_CODE_CHANNEL 0xD2 /* DS2482-800 only */ | |
61 | #define DS2482_PTR_CODE_CONFIG 0xC3 | |
62 | ||
63 | /** | |
64 | * Configure Register bit definitions | |
65 | * The top 4 bits always read 0. | |
66 | * To write, the top nibble must be the 1's compl. of the low nibble. | |
67 | */ | |
9c95bb6f MA |
68 | #define DS2482_REG_CFG_1WS 0x08 /* 1-wire speed */ |
69 | #define DS2482_REG_CFG_SPU 0x04 /* strong pull-up */ | |
70 | #define DS2482_REG_CFG_PPM 0x02 /* presence pulse masking */ | |
71 | #define DS2482_REG_CFG_APU 0x01 /* active pull-up */ | |
baf12ae2 | 72 | |
54865314 | 73 | /* extra configurations - e.g. 1WS */ |
c6446c21 | 74 | static int extra_config; |
baf12ae2 EP |
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] = | |
82 | { 0xF0, 0xE1, 0xD2, 0xC3, 0xB4, 0xA5, 0x96, 0x87 }; | |
83 | static const u8 ds2482_chan_rd[8] = | |
84 | { 0xB8, 0xB1, 0xAA, 0xA3, 0x9C, 0x95, 0x8E, 0x87 }; | |
85 | ||
86 | ||
87 | /** | |
88 | * Status Register bit definitions (read only) | |
89 | */ | |
90 | #define DS2482_REG_STS_DIR 0x80 | |
91 | #define DS2482_REG_STS_TSB 0x40 | |
92 | #define DS2482_REG_STS_SBR 0x20 | |
93 | #define DS2482_REG_STS_RST 0x10 | |
94 | #define DS2482_REG_STS_LL 0x08 | |
95 | #define DS2482_REG_STS_SD 0x04 | |
96 | #define DS2482_REG_STS_PPD 0x02 | |
97 | #define DS2482_REG_STS_1WB 0x01 | |
98 | ||
baf12ae2 EP |
99 | /* |
100 | * Client data (each client gets its own) | |
101 | */ | |
102 | ||
103 | struct ds2482_data; | |
104 | ||
105 | struct ds2482_w1_chan { | |
106 | struct ds2482_data *pdev; | |
107 | u8 channel; | |
108 | struct w1_bus_master w1_bm; | |
109 | }; | |
110 | ||
111 | struct ds2482_data { | |
61c91f7d | 112 | struct i2c_client *client; |
abd52a13 | 113 | struct mutex access_lock; |
baf12ae2 EP |
114 | |
115 | /* 1-wire interface(s) */ | |
116 | int w1_count; /* 1 or 8 */ | |
117 | struct ds2482_w1_chan w1_ch[8]; | |
118 | ||
119 | /* per-device values */ | |
120 | u8 channel; | |
121 | u8 read_prt; /* see DS2482_PTR_CODE_xxx */ | |
122 | u8 reg_config; | |
123 | }; | |
124 | ||
125 | ||
9c95bb6f MA |
126 | /** |
127 | * Helper to calculate values for configuration register | |
128 | * @param conf the raw config value | |
129 | * @return the value w/ complements that can be written to register | |
130 | */ | |
131 | static inline u8 ds2482_calculate_config(u8 conf) | |
132 | { | |
f704938c MB |
133 | if (ds2482_active_pullup) |
134 | conf |= DS2482_REG_CFG_APU; | |
135 | ||
9c95bb6f MA |
136 | return conf | ((~conf & 0x0f) << 4); |
137 | } | |
138 | ||
139 | ||
baf12ae2 EP |
140 | /** |
141 | * Sets the read pointer. | |
142 | * @param pdev The ds2482 client pointer | |
143 | * @param 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) { | |
61c91f7d | 149 | if (i2c_smbus_write_byte_data(pdev->client, |
baf12ae2 EP |
150 | DS2482_CMD_SET_READ_PTR, |
151 | read_ptr) < 0) | |
152 | return -1; | |
153 | ||
154 | pdev->read_prt = read_ptr; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /** | |
160 | * Sends a command without a parameter | |
161 | * @param pdev The ds2482 client pointer | |
162 | * @param 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 | { | |
61c91f7d | 169 | if (i2c_smbus_write_byte(pdev->client, cmd) < 0) |
baf12ae2 EP |
170 | return -1; |
171 | ||
172 | pdev->read_prt = DS2482_PTR_CODE_STATUS; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /** | |
177 | * Sends a command with a parameter | |
178 | * @param pdev The ds2482 client pointer | |
179 | * @param cmd DS2482_CMD_WRITE_CONFIG, | |
180 | * DS2482_CMD_1WIRE_SINGLE_BIT, | |
181 | * DS2482_CMD_1WIRE_WRITE_BYTE, | |
182 | * DS2482_CMD_1WIRE_TRIPLET | |
183 | * @param 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 | { | |
61c91f7d | 189 | if (i2c_smbus_write_byte_data(pdev->client, cmd, byte) < 0) |
baf12ae2 EP |
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 | * Waits until the 1-wire interface is idle (not busy) | |
207 | * | |
208 | * @param 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 { | |
61c91f7d | 218 | temp = i2c_smbus_read_byte(pdev->client); |
baf12ae2 | 219 | } while ((temp >= 0) && (temp & DS2482_REG_STS_1WB) && |
b4786f18 | 220 | (++retries < DS2482_WAIT_IDLE_TIMEOUT)); |
baf12ae2 EP |
221 | } |
222 | ||
67860739 | 223 | if (retries >= DS2482_WAIT_IDLE_TIMEOUT) |
1fda5690 | 224 | pr_err("%s: timeout on channel %d\n", |
baf12ae2 EP |
225 | __func__, pdev->channel); |
226 | ||
227 | return temp; | |
228 | } | |
229 | ||
230 | /** | |
231 | * Selects a w1 channel. | |
232 | * The 1-wire interface must be idle before calling this function. | |
233 | * | |
234 | * @param pdev The ds2482 client pointer | |
235 | * @param channel 0-7 | |
236 | * @return -1 (failure) or 0 (success) | |
237 | */ | |
238 | static int ds2482_set_channel(struct ds2482_data *pdev, u8 channel) | |
239 | { | |
61c91f7d | 240 | if (i2c_smbus_write_byte_data(pdev->client, DS2482_CMD_CHANNEL_SELECT, |
baf12ae2 EP |
241 | ds2482_chan_wr[channel]) < 0) |
242 | return -1; | |
243 | ||
244 | pdev->read_prt = DS2482_PTR_CODE_CHANNEL; | |
245 | pdev->channel = -1; | |
61c91f7d | 246 | if (i2c_smbus_read_byte(pdev->client) == ds2482_chan_rd[channel]) { |
baf12ae2 EP |
247 | pdev->channel = channel; |
248 | return 0; | |
249 | } | |
250 | return -1; | |
251 | } | |
252 | ||
253 | ||
254 | /** | |
255 | * Performs the touch-bit function, which writes a 0 or 1 and reads the level. | |
256 | * | |
257 | * @param data The ds2482 channel pointer | |
258 | * @param 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 | ||
abd52a13 | 267 | mutex_lock(&pdev->access_lock); |
baf12ae2 EP |
268 | |
269 | /* Select the channel */ | |
270 | ds2482_wait_1wire_idle(pdev); | |
271 | if (pdev->w1_count > 1) | |
272 | ds2482_set_channel(pdev, 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 | bit ? 0xFF : 0)) | |
277 | status = ds2482_wait_1wire_idle(pdev); | |
278 | ||
abd52a13 | 279 | mutex_unlock(&pdev->access_lock); |
baf12ae2 EP |
280 | |
281 | return (status & DS2482_REG_STS_SBR) ? 1 : 0; | |
282 | } | |
283 | ||
284 | /** | |
285 | * 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 | * @param data The ds2482 channel pointer | |
290 | * @param 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 | ||
abd52a13 | 299 | mutex_lock(&pdev->access_lock); |
baf12ae2 EP |
300 | |
301 | /* Select the channel */ | |
302 | ds2482_wait_1wire_idle(pdev); | |
303 | if (pdev->w1_count > 1) | |
304 | ds2482_set_channel(pdev, 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 | dbit ? 0xFF : 0)) | |
309 | status = ds2482_wait_1wire_idle(pdev); | |
310 | ||
abd52a13 | 311 | mutex_unlock(&pdev->access_lock); |
baf12ae2 EP |
312 | |
313 | /* Decode the status */ | |
314 | return (status >> 5); | |
315 | } | |
316 | ||
317 | /** | |
318 | * Performs the write byte function. | |
319 | * | |
320 | * @param data The ds2482 channel pointer | |
321 | * @param 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 | ||
abd52a13 | 328 | mutex_lock(&pdev->access_lock); |
baf12ae2 EP |
329 | |
330 | /* Select the channel */ | |
331 | ds2482_wait_1wire_idle(pdev); | |
332 | if (pdev->w1_count > 1) | |
333 | ds2482_set_channel(pdev, pchan->channel); | |
334 | ||
335 | /* Send the write byte command */ | |
336 | ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_WRITE_BYTE, byte); | |
337 | ||
abd52a13 | 338 | mutex_unlock(&pdev->access_lock); |
baf12ae2 EP |
339 | } |
340 | ||
341 | /** | |
342 | * Performs the read byte function. | |
343 | * | |
344 | * @param 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 | ||
abd52a13 | 353 | mutex_lock(&pdev->access_lock); |
baf12ae2 EP |
354 | |
355 | /* Select the channel */ | |
356 | ds2482_wait_1wire_idle(pdev); | |
357 | if (pdev->w1_count > 1) | |
358 | ds2482_set_channel(pdev, 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 */ | |
61c91f7d | 370 | result = i2c_smbus_read_byte(pdev->client); |
baf12ae2 | 371 | |
abd52a13 | 372 | mutex_unlock(&pdev->access_lock); |
baf12ae2 EP |
373 | |
374 | return result; | |
375 | } | |
376 | ||
377 | ||
378 | /** | |
379 | * Sends a reset on the 1-wire interface | |
380 | * | |
381 | * @param 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 | ||
abd52a13 | 391 | mutex_lock(&pdev->access_lock); |
baf12ae2 EP |
392 | |
393 | /* Select the channel */ | |
394 | ds2482_wait_1wire_idle(pdev); | |
395 | if (pdev->w1_count > 1) | |
396 | ds2482_set_channel(pdev, 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, | |
54865314 | 408 | ds2482_calculate_config(extra_config)); |
baf12ae2 EP |
409 | } |
410 | ||
abd52a13 | 411 | mutex_unlock(&pdev->access_lock); |
baf12ae2 EP |
412 | |
413 | return retval; | |
414 | } | |
415 | ||
9c95bb6f MA |
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, | |
54865314 | 434 | ds2482_calculate_config(extra_config|DS2482_REG_CFG_SPU|DS2482_REG_CFG_APU)); |
9c95bb6f MA |
435 | ds2482_wait_1wire_idle(pdev); |
436 | } | |
437 | ||
438 | return retval; | |
439 | } | |
440 | ||
baf12ae2 | 441 | |
61c91f7d JD |
442 | static int ds2482_probe(struct i2c_client *client, |
443 | const struct i2c_device_id *id) | |
baf12ae2 EP |
444 | { |
445 | struct ds2482_data *data; | |
61c91f7d | 446 | int err = -ENODEV; |
baf12ae2 EP |
447 | int temp1; |
448 | int idx; | |
449 | ||
0314b020 JD |
450 | if (!i2c_check_functionality(client->adapter, |
451 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | | |
452 | I2C_FUNC_SMBUS_BYTE)) | |
453 | return -ENODEV; | |
454 | ||
baf12ae2 EP |
455 | if (!(data = kzalloc(sizeof(struct ds2482_data), GFP_KERNEL))) { |
456 | err = -ENOMEM; | |
457 | goto exit; | |
458 | } | |
459 | ||
61c91f7d JD |
460 | data->client = client; |
461 | i2c_set_clientdata(client, data); | |
baf12ae2 EP |
462 | |
463 | /* Reset the device (sets the read_ptr to status) */ | |
464 | if (ds2482_send_cmd(data, DS2482_CMD_RESET) < 0) { | |
61c91f7d | 465 | dev_warn(&client->dev, "DS2482 reset failed.\n"); |
baf12ae2 EP |
466 | goto exit_free; |
467 | } | |
468 | ||
469 | /* Sleep at least 525ns to allow the reset to complete */ | |
470 | ndelay(525); | |
471 | ||
472 | /* Read the status byte - only reset bit and line should be set */ | |
61c91f7d | 473 | temp1 = i2c_smbus_read_byte(client); |
baf12ae2 | 474 | if (temp1 != (DS2482_REG_STS_LL | DS2482_REG_STS_RST)) { |
61c91f7d JD |
475 | dev_warn(&client->dev, "DS2482 reset status " |
476 | "0x%02X - not a DS2482\n", temp1); | |
baf12ae2 EP |
477 | goto exit_free; |
478 | } | |
479 | ||
480 | /* Detect the 8-port version */ | |
481 | data->w1_count = 1; | |
482 | if (ds2482_set_channel(data, 7) == 0) | |
483 | data->w1_count = 8; | |
484 | ||
485 | /* Set all config items to 0 (off) */ | |
9c95bb6f | 486 | ds2482_send_cmd_data(data, DS2482_CMD_WRITE_CONFIG, |
54865314 | 487 | ds2482_calculate_config(extra_config)); |
baf12ae2 | 488 | |
abd52a13 | 489 | mutex_init(&data->access_lock); |
baf12ae2 | 490 | |
baf12ae2 EP |
491 | /* Register 1-wire interface(s) */ |
492 | for (idx = 0; idx < data->w1_count; idx++) { | |
493 | data->w1_ch[idx].pdev = data; | |
494 | data->w1_ch[idx].channel = idx; | |
495 | ||
496 | /* Populate all the w1 bus master stuff */ | |
497 | data->w1_ch[idx].w1_bm.data = &data->w1_ch[idx]; | |
498 | data->w1_ch[idx].w1_bm.read_byte = ds2482_w1_read_byte; | |
499 | data->w1_ch[idx].w1_bm.write_byte = ds2482_w1_write_byte; | |
500 | data->w1_ch[idx].w1_bm.touch_bit = ds2482_w1_touch_bit; | |
501 | data->w1_ch[idx].w1_bm.triplet = ds2482_w1_triplet; | |
502 | data->w1_ch[idx].w1_bm.reset_bus = ds2482_w1_reset_bus; | |
9c95bb6f | 503 | data->w1_ch[idx].w1_bm.set_pullup = ds2482_w1_set_pullup; |
baf12ae2 EP |
504 | |
505 | err = w1_add_master_device(&data->w1_ch[idx].w1_bm); | |
506 | if (err) { | |
507 | data->w1_ch[idx].pdev = NULL; | |
508 | goto exit_w1_remove; | |
509 | } | |
510 | } | |
511 | ||
512 | return 0; | |
513 | ||
514 | exit_w1_remove: | |
baf12ae2 EP |
515 | for (idx = 0; idx < data->w1_count; idx++) { |
516 | if (data->w1_ch[idx].pdev != NULL) | |
517 | w1_remove_master_device(&data->w1_ch[idx].w1_bm); | |
518 | } | |
519 | exit_free: | |
520 | kfree(data); | |
521 | exit: | |
522 | return err; | |
523 | } | |
524 | ||
61c91f7d | 525 | static int ds2482_remove(struct i2c_client *client) |
baf12ae2 EP |
526 | { |
527 | struct ds2482_data *data = i2c_get_clientdata(client); | |
61c91f7d | 528 | int idx; |
baf12ae2 EP |
529 | |
530 | /* Unregister the 1-wire bridge(s) */ | |
531 | for (idx = 0; idx < data->w1_count; idx++) { | |
532 | if (data->w1_ch[idx].pdev != NULL) | |
533 | w1_remove_master_device(&data->w1_ch[idx].w1_bm); | |
534 | } | |
535 | ||
baf12ae2 EP |
536 | /* Free the memory */ |
537 | kfree(data); | |
538 | return 0; | |
539 | } | |
540 | ||
50fa2951 AD |
541 | /** |
542 | * Driver data (common to all clients) | |
543 | */ | |
544 | static const struct i2c_device_id ds2482_id[] = { | |
545 | { "ds2482", 0 }, | |
546 | { } | |
547 | }; | |
548 | MODULE_DEVICE_TABLE(i2c, ds2482_id); | |
549 | ||
550 | static struct i2c_driver ds2482_driver = { | |
551 | .driver = { | |
552 | .name = "ds2482", | |
553 | }, | |
554 | .probe = ds2482_probe, | |
555 | .remove = ds2482_remove, | |
556 | .id_table = ds2482_id, | |
557 | }; | |
dbfd5ccc | 558 | module_i2c_driver(ds2482_driver); |
baf12ae2 EP |
559 | |
560 | MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>"); | |
561 | MODULE_DESCRIPTION("DS2482 driver"); | |
54865314 AW |
562 | module_param(extra_config, int, S_IRUGO | S_IWUSR); |
563 | MODULE_PARM_DESC(extra_config, "Extra Configuration settings 1=APU,2=PPM,3=SPU,8=1WS"); | |
564 | ||
baf12ae2 | 565 | MODULE_LICENSE("GPL"); |