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[mirror_ubuntu-bionic-kernel.git] / drivers / misc / ad525x_dpot.c
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4eb174be 1/*
6c536e4c
MH		 2 * ad525x_dpot: Driver for the Analog Devices digital potentiometers
3 * Copyright (c) 2009-2010 Analog Devices, Inc.
4eb174be
MH		 4 * Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
5 *
6 * DEVID #Wipers #Positions Resistor Options (kOhm)
7 * AD5258 1 64 1, 10, 50, 100
8 * AD5259 1 256 5, 10, 50, 100
9 * AD5251 2 64 1, 10, 50, 100
10 * AD5252 2 256 1, 10, 50, 100
11 * AD5255 3 512 25, 250
12 * AD5253 4 64 1, 10, 50, 100
13 * AD5254 4 256 1, 10, 50, 100
6c536e4c
MH		 14 * AD5160 1 256 5, 10, 50, 100
15 * AD5161 1 256 5, 10, 50, 100
16 * AD5162 2 256 2.5, 10, 50, 100
17 * AD5165 1 256 100
18 * AD5200 1 256 10, 50
19 * AD5201 1 33 10, 50
20 * AD5203 4 64 10, 100
21 * AD5204 4 256 10, 50, 100
22 * AD5206 6 256 10, 50, 100
23 * AD5207 2 256 10, 50, 100
24 * AD5231 1 1024 10, 50, 100
25 * AD5232 2 256 10, 50, 100
26 * AD5233 4 64 10, 50, 100
27 * AD5235 2 1024 25, 250
28 * AD5260 1 256 20, 50, 200
29 * AD5262 2 256 20, 50, 200
30 * AD5263 4 256 20, 50, 200
31 * AD5290 1 256 10, 50, 100
a4bd3949
MH		 32 * AD5291 1 256 20, 50, 100 (20-TP)
33 * AD5292 1 1024 20, 50, 100 (20-TP)
34 * AD5293 1 1024 20, 50, 100
6c536e4c
MH		 35 * AD7376 1 128 10, 50, 100, 1M
36 * AD8400 1 256 1, 10, 50, 100
37 * AD8402 2 256 1, 10, 50, 100
38 * AD8403 4 256 1, 10, 50, 100
39 * ADN2850 3 512 25, 250
e3ae6847
MH		 40 * AD5241 1 256 10, 100, 1M
41 * AD5246 1 128 5, 10, 50, 100
42 * AD5247 1 128 5, 10, 50, 100
43 * AD5245 1 256 5, 10, 50, 100
44 * AD5243 2 256 2.5, 10, 50, 100
45 * AD5248 2 256 2.5, 10, 50, 100
46 * AD5242 2 256 20, 50, 200
c74cba61
MH		 47 * AD5280 1 256 20, 50, 200
48 * AD5282 2 256 20, 50, 200
49 * ADN2860 3 512 25, 250
59592d0c
MH		 50 * AD5273 1 64 1, 10, 50, 100 (OTP)
51 * AD5171 1 64 5, 10, 50, 100 (OTP)
52 * AD5170 1 256 2.5, 10, 50, 100 (OTP)
53 * AD5172 2 256 2.5, 10, 50, 100 (OTP)
54 * AD5173 2 256 2.5, 10, 50, 100 (OTP)
a4bd3949
MH		 55 * AD5270 1 1024 20, 50, 100 (50-TP)
56 * AD5271 1 256 20, 50, 100 (50-TP)
57 * AD5272 1 1024 20, 50, 100 (50-TP)
58 * AD5274 1 256 20, 50, 100 (50-TP)
4eb174be
MH		 59 *
60 * See Documentation/misc-devices/ad525x_dpot.txt for more info.
61 *
62 * derived from ad5258.c
63 * Copyright (c) 2009 Cyber Switching, Inc.
64 * Author: Chris Verges <chrisv@cyberswitching.com>
65 *
66 * derived from ad5252.c
7f3379de 67 * Copyright (c) 2006-2011 Michael Hennerich <hennerich@blackfin.uclinux.org>
4eb174be
MH		 68 *
69 * Licensed under the GPL-2 or later.
70 */
71
72#include <linux/module.h>
73#include <linux/device.h>
74#include <linux/kernel.h>
4eb174be 75#include <linux/delay.h>
6c536e4c 76#include <linux/slab.h>
4eb174be 77
6c536e4c 78#include "ad525x_dpot.h"
4eb174be
MH		 79
80/*
81 * Client data (each client gets its own)
82 */
83
84struct dpot_data {
6c536e4c 85 struct ad_dpot_bus_data bdata;
4eb174be
MH		 86 struct mutex update_lock;
87 unsigned rdac_mask;
88 unsigned max_pos;
6c536e4c
MH		 89 unsigned long devid;
90 unsigned uid;
91 unsigned feat;
92 unsigned wipers;
59592d0c
MH		 93 u16 rdac_cache[MAX_RDACS];
94 DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
4eb174be
MH		 95};
96
6c536e4c
MH		 97static inline int dpot_read_d8(struct dpot_data *dpot)
98{
99 return dpot->bdata.bops->read_d8(dpot->bdata.client);
100}
101
102static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg)
103{
104 return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg);
105}
106
107static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg)
108{
109 return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg);
110}
111
112static inline int dpot_write_d8(struct dpot_data *dpot, u8 val)
113{
114 return dpot->bdata.bops->write_d8(dpot->bdata.client, val);
115}
116
117static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val)
118{
119 return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val);
120}
121
122static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
123{
124 return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
125}
126
e3ae6847 127static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
6c536e4c 128{
e3ae6847 129 unsigned ctrl = 0;
a4bd3949 130 int value;
6c536e4c 131
e3ae6847 132 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
6c536e4c 133
e3ae6847
MH		 134 if (dpot->feat & F_RDACS_WONLY)
135 return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
e3ae6847
MH		 136 if (dpot->uid == DPOT_UID(AD5291_ID) ||
137 dpot->uid == DPOT_UID(AD5292_ID) ||
a4bd3949
MH		 138 dpot->uid == DPOT_UID(AD5293_ID)) {
139
140 value = dpot_read_r8d8(dpot,
e3ae6847 141 DPOT_AD5291_READ_RDAC << 2);
6c536e4c 142
a4bd3949
MH		 143 if (dpot->uid == DPOT_UID(AD5291_ID))
144 value = value >> 2;
145
146 return value;
147 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
148 dpot->uid == DPOT_UID(AD5271_ID)) {
149
150 value = dpot_read_r8d8(dpot,
151 DPOT_AD5270_1_2_4_READ_RDAC << 2);
152
153 if (value < 0)
154 return value;
155
156 if (dpot->uid == DPOT_UID(AD5271_ID))
157 value = value >> 2;
158
159 return value;
160 }
161
e3ae6847
MH		 162 ctrl = DPOT_SPI_READ_RDAC;
163 } else if (reg & DPOT_ADDR_EEPROM) {
164 ctrl = DPOT_SPI_READ_EEPROM;
165 }
6c536e4c 166
e3ae6847
MH		 167 if (dpot->feat & F_SPI_16BIT)
168 return dpot_read_r8d8(dpot, ctrl);
169 else if (dpot->feat & F_SPI_24BIT)
170 return dpot_read_r8d16(dpot, ctrl);
6c536e4c 171
e3ae6847
MH		 172 return -EFAULT;
173}
6c536e4c 174
e3ae6847
MH		 175static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
176{
a4bd3949 177 int value;
e3ae6847
MH		 178 unsigned ctrl = 0;
179 switch (dpot->uid) {
180 case DPOT_UID(AD5246_ID):
181 case DPOT_UID(AD5247_ID):
182 return dpot_read_d8(dpot);
183 case DPOT_UID(AD5245_ID):
184 case DPOT_UID(AD5241_ID):
185 case DPOT_UID(AD5242_ID):
186 case DPOT_UID(AD5243_ID):
187 case DPOT_UID(AD5248_ID):
c74cba61
MH		 188 case DPOT_UID(AD5280_ID):
189 case DPOT_UID(AD5282_ID):
e3ae6847 190 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 191 0 : DPOT_AD5282_RDAC_AB;
e3ae6847 192 return dpot_read_r8d8(dpot, ctrl);
59592d0c
MH		 193 case DPOT_UID(AD5170_ID):
194 case DPOT_UID(AD5171_ID):
195 case DPOT_UID(AD5273_ID):
196 return dpot_read_d8(dpot);
197 case DPOT_UID(AD5172_ID):
198 case DPOT_UID(AD5173_ID):
199 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 200 0 : DPOT_AD5172_3_A0;
59592d0c 201 return dpot_read_r8d8(dpot, ctrl);
a4bd3949
MH		 202 case DPOT_UID(AD5272_ID):
203 case DPOT_UID(AD5274_ID):
204 dpot_write_r8d8(dpot,
205 (DPOT_AD5270_1_2_4_READ_RDAC << 2), 0);
206
207 value = dpot_read_r8d16(dpot,
208 DPOT_AD5270_1_2_4_RDAC << 2);
209
210 if (value < 0)
211 return value;
212 /*
213 * AD5272/AD5274 returns high byte first, however
214 * underling smbus expects low byte first.
215 */
216 value = swab16(value);
217
218 if (dpot->uid == DPOT_UID(AD5271_ID))
219 value = value >> 2;
220 return value;
e3ae6847 221 default:
6c536e4c
MH		 222 if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
223 return dpot_read_r8d16(dpot, (reg & 0xF8) |
224 ((reg & 0x7) << 1));
225 else
226 return dpot_read_r8d8(dpot, reg);
6c536e4c 227 }
6c536e4c
MH		 228}
229
e3ae6847
MH		 230static s32 dpot_read(struct dpot_data *dpot, u8 reg)
231{
232 if (dpot->feat & F_SPI)
233 return dpot_read_spi(dpot, reg);
234 else
235 return dpot_read_i2c(dpot, reg);
236}
237
238static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
6c536e4c
MH		 239{
240 unsigned val = 0;
241
a4bd3949 242 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
e3ae6847
MH		 243 if (dpot->feat & F_RDACS_WONLY)
244 dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
245
246 if (dpot->feat & F_AD_APPDATA) {
247 if (dpot->feat & F_SPI_8BIT) {
248 val = ((reg & DPOT_RDAC_MASK) <<
249 DPOT_MAX_POS(dpot->devid)) |
250 value;
251 return dpot_write_d8(dpot, val);
252 } else if (dpot->feat & F_SPI_16BIT) {
253 val = ((reg & DPOT_RDAC_MASK) <<
254 DPOT_MAX_POS(dpot->devid)) |
255 value;
256 return dpot_write_r8d8(dpot, val >> 8,
257 val & 0xFF);
258 } else
259 BUG();
260 } else {
261 if (dpot->uid == DPOT_UID(AD5291_ID) ||
262 dpot->uid == DPOT_UID(AD5292_ID) ||
a4bd3949
MH		 263 dpot->uid == DPOT_UID(AD5293_ID)) {
264
265 dpot_write_r8d8(dpot, DPOT_AD5291_CTRLREG << 2,
266 DPOT_AD5291_UNLOCK_CMD);
267
268 if (dpot->uid == DPOT_UID(AD5291_ID))
269 value = value << 2;
270
e3ae6847
MH		 271 return dpot_write_r8d8(dpot,
272 (DPOT_AD5291_RDAC << 2) |
273 (value >> 8), value & 0xFF);
a4bd3949
MH		 274 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
275 dpot->uid == DPOT_UID(AD5271_ID)) {
276 dpot_write_r8d8(dpot,
277 DPOT_AD5270_1_2_4_CTRLREG << 2,
278 DPOT_AD5270_1_2_4_UNLOCK_CMD);
279
280 if (dpot->uid == DPOT_UID(AD5271_ID))
281 value = value << 2;
6c536e4c 282
a4bd3949
MH		 283 return dpot_write_r8d8(dpot,
284 (DPOT_AD5270_1_2_4_RDAC << 2) |
285 (value >> 8), value & 0xFF);
286 }
e3ae6847
MH		 287 val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
288 }
289 } else if (reg & DPOT_ADDR_EEPROM) {
290 val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
291 } else if (reg & DPOT_ADDR_CMD) {
292 switch (reg) {
293 case DPOT_DEC_ALL_6DB:
294 val = DPOT_SPI_DEC_ALL_6DB;
295 break;
296 case DPOT_INC_ALL_6DB:
297 val = DPOT_SPI_INC_ALL_6DB;
298 break;
299 case DPOT_DEC_ALL:
300 val = DPOT_SPI_DEC_ALL;
301 break;
302 case DPOT_INC_ALL:
303 val = DPOT_SPI_INC_ALL;
304 break;
305 }
a4bd3949
MH		 306 } else if (reg & DPOT_ADDR_OTP) {
307 if (dpot->uid == DPOT_UID(AD5291_ID) ||
308 dpot->uid == DPOT_UID(AD5292_ID)) {
309 return dpot_write_r8d8(dpot,
310 DPOT_AD5291_STORE_XTPM << 2, 0);
311 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
312 dpot->uid == DPOT_UID(AD5271_ID)) {
313 return dpot_write_r8d8(dpot,
314 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
315 }
e3ae6847
MH		 316 } else
317 BUG();
318
319 if (dpot->feat & F_SPI_16BIT)
320 return dpot_write_r8d8(dpot, val, value);
321 else if (dpot->feat & F_SPI_24BIT)
322 return dpot_write_r8d16(dpot, val, value);
6c536e4c
MH		 323
324 return -EFAULT;
325}
326
e3ae6847
MH		 327static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
328{
329 /* Only write the instruction byte for certain commands */
59592d0c 330 unsigned tmp = 0, ctrl = 0;
e3ae6847
MH		 331
332 switch (dpot->uid) {
333 case DPOT_UID(AD5246_ID):
334 case DPOT_UID(AD5247_ID):
335 return dpot_write_d8(dpot, value);
336 break;
337
338 case DPOT_UID(AD5245_ID):
339 case DPOT_UID(AD5241_ID):
340 case DPOT_UID(AD5242_ID):
341 case DPOT_UID(AD5243_ID):
342 case DPOT_UID(AD5248_ID):
c74cba61
MH		 343 case DPOT_UID(AD5280_ID):
344 case DPOT_UID(AD5282_ID):
345 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 346 0 : DPOT_AD5282_RDAC_AB;
e3ae6847
MH		 347 return dpot_write_r8d8(dpot, ctrl, value);
348 break;
59592d0c
MH		 349 case DPOT_UID(AD5171_ID):
350 case DPOT_UID(AD5273_ID):
351 if (reg & DPOT_ADDR_OTP) {
352 tmp = dpot_read_d8(dpot);
353 if (tmp >> 6) /* Ready to Program? */
354 return -EFAULT;
355 ctrl = DPOT_AD5273_FUSE;
356 }
357 return dpot_write_r8d8(dpot, ctrl, value);
358 break;
359 case DPOT_UID(AD5172_ID):
360 case DPOT_UID(AD5173_ID):
361 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 362 0 : DPOT_AD5172_3_A0;
59592d0c
MH		 363 if (reg & DPOT_ADDR_OTP) {
364 tmp = dpot_read_r8d16(dpot, ctrl);
365 if (tmp >> 14) /* Ready to Program? */
366 return -EFAULT;
5f400cf4 367 ctrl |= DPOT_AD5170_2_3_FUSE;
59592d0c
MH		 368 }
369 return dpot_write_r8d8(dpot, ctrl, value);
370 break;
371 case DPOT_UID(AD5170_ID):
372 if (reg & DPOT_ADDR_OTP) {
373 tmp = dpot_read_r8d16(dpot, tmp);
374 if (tmp >> 14) /* Ready to Program? */
375 return -EFAULT;
a4bd3949 376 ctrl = DPOT_AD5170_2_3_FUSE;
59592d0c
MH		 377 }
378 return dpot_write_r8d8(dpot, ctrl, value);
379 break;
a4bd3949
MH		 380 case DPOT_UID(AD5272_ID):
381 case DPOT_UID(AD5274_ID):
382 dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
383 DPOT_AD5270_1_2_4_UNLOCK_CMD);
384
385 if (reg & DPOT_ADDR_OTP)
386 return dpot_write_r8d8(dpot,
387 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
388
389 if (dpot->uid == DPOT_UID(AD5274_ID))
390 value = value << 2;
391
392 return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
393 (value >> 8), value & 0xFF);
394 break;
e3ae6847 395 default:
c74cba61
MH		 396 if (reg & DPOT_ADDR_CMD)
397 return dpot_write_d8(dpot, reg);
e3ae6847 398
c74cba61
MH		 399 if (dpot->max_pos > 256)
400 return dpot_write_r8d16(dpot, (reg & 0xF8) |
401 ((reg & 0x7) << 1), value);
402 else
403 /* All other registers require instruction + data bytes */
404 return dpot_write_r8d8(dpot, reg, value);
e3ae6847
MH		 405 }
406}
407
e3ae6847
MH		 408static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
409{
410 if (dpot->feat & F_SPI)
411 return dpot_write_spi(dpot, reg, value);
412 else
413 return dpot_write_i2c(dpot, reg, value);
414}
415
4eb174be
MH		 416/* sysfs functions */
417
418static ssize_t sysfs_show_reg(struct device *dev,
6c536e4c
MH		 419 struct device_attribute *attr,
420 char *buf, u32 reg)
4eb174be 421{
6c536e4c 422 struct dpot_data *data = dev_get_drvdata(dev);
4eb174be
MH		 423 s32 value;
424
59592d0c
MH		 425 if (reg & DPOT_ADDR_OTP_EN)
426 return sprintf(buf, "%s\n",
427 test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
428 "enabled" : "disabled");
429
430
4eb174be 431 mutex_lock(&data->update_lock);
6c536e4c 432 value = dpot_read(data, reg);
4eb174be
MH		 433 mutex_unlock(&data->update_lock);
434
435 if (value < 0)
436 return -EINVAL;
437 /*
438 * Let someone else deal with converting this ...
439 * the tolerance is a two-byte value where the MSB
440 * is a sign + integer value, and the LSB is a
441 * decimal value. See page 18 of the AD5258
442 * datasheet (Rev. A) for more details.
443 */
444
6c536e4c 445 if (reg & DPOT_REG_TOL)
4eb174be
MH		 446 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
447 else
448 return sprintf(buf, "%u\n", value & data->rdac_mask);
449}
450
451static ssize_t sysfs_set_reg(struct device *dev,
452 struct device_attribute *attr,
453 const char *buf, size_t count, u32 reg)
454{
6c536e4c 455 struct dpot_data *data = dev_get_drvdata(dev);
4eb174be
MH		 456 unsigned long value;
457 int err;
458
59592d0c
MH		 459 if (reg & DPOT_ADDR_OTP_EN) {
460 if (!strncmp(buf, "enabled", sizeof("enabled")))
461 set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
462 else
463 clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
464
465 return count;
466 }
467
468 if ((reg & DPOT_ADDR_OTP) &&
469 !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
470 return -EPERM;
471
f7b41276 472 err = kstrtoul(buf, 10, &value);
4eb174be
MH		 473 if (err)
474 return err;
475
476 if (value > data->rdac_mask)
477 value = data->rdac_mask;
478
479 mutex_lock(&data->update_lock);
6c536e4c
MH		 480 dpot_write(data, reg, value);
481 if (reg & DPOT_ADDR_EEPROM)
4eb174be 482 msleep(26); /* Sleep while the EEPROM updates */
59592d0c
MH		 483 else if (reg & DPOT_ADDR_OTP)
484 msleep(400); /* Sleep while the OTP updates */
4eb174be
MH		 485 mutex_unlock(&data->update_lock);
486
487 return count;
488}
489
490static ssize_t sysfs_do_cmd(struct device *dev,
491 struct device_attribute *attr,
492 const char *buf, size_t count, u32 reg)
493{
6c536e4c 494 struct dpot_data *data = dev_get_drvdata(dev);
4eb174be
MH		 495
496 mutex_lock(&data->update_lock);
6c536e4c 497 dpot_write(data, reg, 0);
4eb174be
MH		 498 mutex_unlock(&data->update_lock);
499
500 return count;
501}
502
503/* ------------------------------------------------------------------------- */
504
0993dbed
MH		 505#define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
506show_##_name(struct device *dev, \
507 struct device_attribute *attr, char *buf) \
508{ \
509 return sysfs_show_reg(dev, attr, buf, _reg); \
4eb174be
MH		 510}
511
0993dbed
MH		 512#define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
513set_##_name(struct device *dev, \
514 struct device_attribute *attr, \
515 const char *buf, size_t count) \
516{ \
517 return sysfs_set_reg(dev, attr, buf, count, _reg); \
4eb174be
MH		 518}
519
0993dbed
MH		 520#define DPOT_DEVICE_SHOW_SET(name, reg) \
521DPOT_DEVICE_SHOW(name, reg) \
522DPOT_DEVICE_SET(name, reg) \
523static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
4eb174be 524
0993dbed
MH		 525#define DPOT_DEVICE_SHOW_ONLY(name, reg) \
526DPOT_DEVICE_SHOW(name, reg) \
527static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
4eb174be 528
6c536e4c
MH		 529DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
530DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
531DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
59592d0c
MH		 532DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
533DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
6c536e4c
MH		 534
535DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
536DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
537DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
59592d0c
MH		 538DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
539DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
6c536e4c
MH		 540
541DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
542DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
543DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
59592d0c
MH		 544DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
545DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
6c536e4c
MH		 546
547DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
548DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
549DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
59592d0c
MH		 550DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
551DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
6c536e4c
MH		 552
553DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
554DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
555DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
59592d0c
MH		 556DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
557DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
6c536e4c
MH		 558
559DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
560DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
561DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
59592d0c
MH		 562DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
563DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
6c536e4c
MH		 564
565static const struct attribute *dpot_attrib_wipers[] = {
566 &dev_attr_rdac0.attr,
567 &dev_attr_rdac1.attr,
568 &dev_attr_rdac2.attr,
569 &dev_attr_rdac3.attr,
570 &dev_attr_rdac4.attr,
571 &dev_attr_rdac5.attr,
572 NULL
573};
574
575static const struct attribute *dpot_attrib_eeprom[] = {
576 &dev_attr_eeprom0.attr,
577 &dev_attr_eeprom1.attr,
578 &dev_attr_eeprom2.attr,
579 &dev_attr_eeprom3.attr,
580 &dev_attr_eeprom4.attr,
581 &dev_attr_eeprom5.attr,
582 NULL
4eb174be
MH		 583};
584
59592d0c
MH		 585static const struct attribute *dpot_attrib_otp[] = {
586 &dev_attr_otp0.attr,
587 &dev_attr_otp1.attr,
588 &dev_attr_otp2.attr,
589 &dev_attr_otp3.attr,
590 &dev_attr_otp4.attr,
591 &dev_attr_otp5.attr,
592 NULL
593};
594
595static const struct attribute *dpot_attrib_otp_en[] = {
596 &dev_attr_otp0en.attr,
597 &dev_attr_otp1en.attr,
598 &dev_attr_otp2en.attr,
599 &dev_attr_otp3en.attr,
600 &dev_attr_otp4en.attr,
601 &dev_attr_otp5en.attr,
602 NULL
603};
604
6c536e4c
MH		 605static const struct attribute *dpot_attrib_tolerance[] = {
606 &dev_attr_tolerance0.attr,
607 &dev_attr_tolerance1.attr,
608 &dev_attr_tolerance2.attr,
609 &dev_attr_tolerance3.attr,
610 &dev_attr_tolerance4.attr,
611 &dev_attr_tolerance5.attr,
612 NULL
4eb174be
MH		 613};
614
615/* ------------------------------------------------------------------------- */
616
0993dbed
MH		 617#define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
618set_##_name(struct device *dev, \
619 struct device_attribute *attr, \
620 const char *buf, size_t count) \
621{ \
622 return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
623} \
624static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
625
6c536e4c
MH		 626DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
627DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
628DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
629DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
4eb174be
MH		 630
631static struct attribute *ad525x_attributes_commands[] = {
632 &dev_attr_inc_all.attr,
633 &dev_attr_dec_all.attr,
634 &dev_attr_inc_all_6db.attr,
635 &dev_attr_dec_all_6db.attr,
636 NULL
637};
638
639static const struct attribute_group ad525x_group_commands = {
640 .attrs = ad525x_attributes_commands,
641};
642
1bdd2c45 643static int ad_dpot_add_files(struct device *dev,
6c536e4c 644 unsigned features, unsigned rdac)
4eb174be 645{
6c536e4c
MH		 646 int err = sysfs_create_file(&dev->kobj,
647 dpot_attrib_wipers[rdac]);
648 if (features & F_CMD_EEP)
649 err |= sysfs_create_file(&dev->kobj,
650 dpot_attrib_eeprom[rdac]);
651 if (features & F_CMD_TOL)
652 err |= sysfs_create_file(&dev->kobj,
653 dpot_attrib_tolerance[rdac]);
59592d0c
MH		 654 if (features & F_CMD_OTP) {
655 err |= sysfs_create_file(&dev->kobj,
656 dpot_attrib_otp_en[rdac]);
657 err |= sysfs_create_file(&dev->kobj,
658 dpot_attrib_otp[rdac]);
659 }
4eb174be 660
6c536e4c
MH		 661 if (err)
662 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
663 rdac);
664
665 return err;
4eb174be
MH		 666}
667
1bdd2c45 668static inline void ad_dpot_remove_files(struct device *dev,
6c536e4c 669 unsigned features, unsigned rdac)
4eb174be 670{
6c536e4c
MH		 671 sysfs_remove_file(&dev->kobj,
672 dpot_attrib_wipers[rdac]);
673 if (features & F_CMD_EEP)
674 sysfs_remove_file(&dev->kobj,
675 dpot_attrib_eeprom[rdac]);
676 if (features & F_CMD_TOL)
677 sysfs_remove_file(&dev->kobj,
678 dpot_attrib_tolerance[rdac]);
59592d0c
MH		 679 if (features & F_CMD_OTP) {
680 sysfs_remove_file(&dev->kobj,
681 dpot_attrib_otp_en[rdac]);
682 sysfs_remove_file(&dev->kobj,
683 dpot_attrib_otp[rdac]);
684 }
4eb174be
MH		 685}
686
80c8ae28 687int ad_dpot_probe(struct device *dev,
7f3379de
MH		 688 struct ad_dpot_bus_data *bdata, unsigned long devid,
689 const char *name)
4eb174be 690{
4eb174be 691
6c536e4c
MH		 692 struct dpot_data *data;
693 int i, err = 0;
4eb174be
MH		 694
695 data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
696 if (!data) {
697 err = -ENOMEM;
698 goto exit;
699 }
700
6c536e4c 701 dev_set_drvdata(dev, data);
4eb174be
MH		 702 mutex_init(&data->update_lock);
703
6c536e4c 704 data->bdata = *bdata;
7f3379de 705 data->devid = devid;
6c536e4c 706
7f3379de 707 data->max_pos = 1 << DPOT_MAX_POS(devid);
6c536e4c 708 data->rdac_mask = data->max_pos - 1;
7f3379de
MH		 709 data->feat = DPOT_FEAT(devid);
710 data->uid = DPOT_UID(devid);
711 data->wipers = DPOT_WIPERS(devid);
6c536e4c 712
59592d0c 713 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
6c536e4c
MH		 714 if (data->wipers & (1 << i)) {
715 err = ad_dpot_add_files(dev, data->feat, i);
716 if (err)
717 goto exit_remove_files;
718 /* power-up midscale */
719 if (data->feat & F_RDACS_WONLY)
720 data->rdac_cache[i] = data->max_pos / 2;
721 }
722
723 if (data->feat & F_CMD_INC)
724 err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
4eb174be
MH		 725
726 if (err) {
727 dev_err(dev, "failed to register sysfs hooks\n");
728 goto exit_free;
729 }
730
4eb174be 731 dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
7f3379de 732 name, data->max_pos);
4eb174be
MH		 733
734 return 0;
735
6c536e4c 736exit_remove_files:
59592d0c 737 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
6c536e4c
MH		 738 if (data->wipers & (1 << i))
739 ad_dpot_remove_files(dev, data->feat, i);
740
4eb174be
MH		 741exit_free:
742 kfree(data);
6c536e4c 743 dev_set_drvdata(dev, NULL);
4eb174be 744exit:
6c536e4c 745 dev_err(dev, "failed to create client for %s ID 0x%lX\n",
7f3379de 746 name, devid);
4eb174be
MH		 747 return err;
748}
6c536e4c 749EXPORT_SYMBOL(ad_dpot_probe);
4eb174be 750
0ed0d579 751int ad_dpot_remove(struct device *dev)
4eb174be 752{
6c536e4c
MH		 753 struct dpot_data *data = dev_get_drvdata(dev);
754 int i;
755
59592d0c 756 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
6c536e4c
MH		 757 if (data->wipers & (1 << i))
758 ad_dpot_remove_files(dev, data->feat, i);
4eb174be 759
4eb174be
MH		 760 kfree(data);
761
762 return 0;
763}
6c536e4c 764EXPORT_SYMBOL(ad_dpot_remove);
4eb174be 765
4eb174be
MH		 766
767MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
6c536e4c
MH		 768 "Michael Hennerich <hennerich@blackfin.uclinux.org>");
769MODULE_DESCRIPTION("Digital potentiometer driver");
4eb174be 770MODULE_LICENSE("GPL");
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