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Merge branch 'parisc-4.6-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[linux-2.6-block.git] / drivers / misc / ad525x_dpot.c
CommitLineData
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 178 unsigned ctrl = 0;
15584555 179
e3ae6847
MH		 180 switch (dpot->uid) {
181 case DPOT_UID(AD5246_ID):
182 case DPOT_UID(AD5247_ID):
183 return dpot_read_d8(dpot);
184 case DPOT_UID(AD5245_ID):
185 case DPOT_UID(AD5241_ID):
186 case DPOT_UID(AD5242_ID):
187 case DPOT_UID(AD5243_ID):
188 case DPOT_UID(AD5248_ID):
c74cba61
MH		 189 case DPOT_UID(AD5280_ID):
190 case DPOT_UID(AD5282_ID):
e3ae6847 191 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 192 0 : DPOT_AD5282_RDAC_AB;
e3ae6847 193 return dpot_read_r8d8(dpot, ctrl);
59592d0c
MH		 194 case DPOT_UID(AD5170_ID):
195 case DPOT_UID(AD5171_ID):
196 case DPOT_UID(AD5273_ID):
197 return dpot_read_d8(dpot);
198 case DPOT_UID(AD5172_ID):
199 case DPOT_UID(AD5173_ID):
200 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 201 0 : DPOT_AD5172_3_A0;
59592d0c 202 return dpot_read_r8d8(dpot, ctrl);
a4bd3949
MH		 203 case DPOT_UID(AD5272_ID):
204 case DPOT_UID(AD5274_ID):
205 dpot_write_r8d8(dpot,
206 (DPOT_AD5270_1_2_4_READ_RDAC << 2), 0);
207
208 value = dpot_read_r8d16(dpot,
209 DPOT_AD5270_1_2_4_RDAC << 2);
210
211 if (value < 0)
212 return value;
213 /*
214 * AD5272/AD5274 returns high byte first, however
215 * underling smbus expects low byte first.
216 */
217 value = swab16(value);
218
f3df53e4 219 if (dpot->uid == DPOT_UID(AD5274_ID))
a4bd3949
MH		 220 value = value >> 2;
221 return value;
e3ae6847 222 default:
6c536e4c
MH		 223 if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
224 return dpot_read_r8d16(dpot, (reg & 0xF8) |
225 ((reg & 0x7) << 1));
226 else
227 return dpot_read_r8d8(dpot, reg);
6c536e4c 228 }
6c536e4c
MH		 229}
230
e3ae6847
MH		 231static s32 dpot_read(struct dpot_data *dpot, u8 reg)
232{
233 if (dpot->feat & F_SPI)
234 return dpot_read_spi(dpot, reg);
235 else
236 return dpot_read_i2c(dpot, reg);
237}
238
239static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
6c536e4c
MH		 240{
241 unsigned val = 0;
242
a4bd3949 243 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
e3ae6847
MH		 244 if (dpot->feat & F_RDACS_WONLY)
245 dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
246
247 if (dpot->feat & F_AD_APPDATA) {
248 if (dpot->feat & F_SPI_8BIT) {
249 val = ((reg & DPOT_RDAC_MASK) <<
250 DPOT_MAX_POS(dpot->devid)) |
251 value;
252 return dpot_write_d8(dpot, val);
253 } else if (dpot->feat & F_SPI_16BIT) {
254 val = ((reg & DPOT_RDAC_MASK) <<
255 DPOT_MAX_POS(dpot->devid)) |
256 value;
257 return dpot_write_r8d8(dpot, val >> 8,
258 val & 0xFF);
259 } else
260 BUG();
261 } else {
262 if (dpot->uid == DPOT_UID(AD5291_ID) ||
263 dpot->uid == DPOT_UID(AD5292_ID) ||
a4bd3949
MH		 264 dpot->uid == DPOT_UID(AD5293_ID)) {
265
266 dpot_write_r8d8(dpot, DPOT_AD5291_CTRLREG << 2,
267 DPOT_AD5291_UNLOCK_CMD);
268
269 if (dpot->uid == DPOT_UID(AD5291_ID))
270 value = value << 2;
271
e3ae6847
MH		 272 return dpot_write_r8d8(dpot,
273 (DPOT_AD5291_RDAC << 2) |
274 (value >> 8), value & 0xFF);
a4bd3949
MH		 275 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
276 dpot->uid == DPOT_UID(AD5271_ID)) {
277 dpot_write_r8d8(dpot,
278 DPOT_AD5270_1_2_4_CTRLREG << 2,
279 DPOT_AD5270_1_2_4_UNLOCK_CMD);
280
281 if (dpot->uid == DPOT_UID(AD5271_ID))
282 value = value << 2;
6c536e4c 283
a4bd3949
MH		 284 return dpot_write_r8d8(dpot,
285 (DPOT_AD5270_1_2_4_RDAC << 2) |
286 (value >> 8), value & 0xFF);
287 }
e3ae6847
MH		 288 val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
289 }
290 } else if (reg & DPOT_ADDR_EEPROM) {
291 val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
292 } else if (reg & DPOT_ADDR_CMD) {
293 switch (reg) {
294 case DPOT_DEC_ALL_6DB:
295 val = DPOT_SPI_DEC_ALL_6DB;
296 break;
297 case DPOT_INC_ALL_6DB:
298 val = DPOT_SPI_INC_ALL_6DB;
299 break;
300 case DPOT_DEC_ALL:
301 val = DPOT_SPI_DEC_ALL;
302 break;
303 case DPOT_INC_ALL:
304 val = DPOT_SPI_INC_ALL;
305 break;
306 }
a4bd3949
MH		 307 } else if (reg & DPOT_ADDR_OTP) {
308 if (dpot->uid == DPOT_UID(AD5291_ID) ||
309 dpot->uid == DPOT_UID(AD5292_ID)) {
310 return dpot_write_r8d8(dpot,
311 DPOT_AD5291_STORE_XTPM << 2, 0);
312 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
313 dpot->uid == DPOT_UID(AD5271_ID)) {
314 return dpot_write_r8d8(dpot,
315 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
316 }
e3ae6847
MH		 317 } else
318 BUG();
319
320 if (dpot->feat & F_SPI_16BIT)
321 return dpot_write_r8d8(dpot, val, value);
322 else if (dpot->feat & F_SPI_24BIT)
323 return dpot_write_r8d16(dpot, val, value);
6c536e4c
MH		 324
325 return -EFAULT;
326}
327
e3ae6847
MH		 328static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
329{
330 /* Only write the instruction byte for certain commands */
59592d0c 331 unsigned tmp = 0, ctrl = 0;
e3ae6847
MH		 332
333 switch (dpot->uid) {
334 case DPOT_UID(AD5246_ID):
335 case DPOT_UID(AD5247_ID):
336 return dpot_write_d8(dpot, value);
e3ae6847
MH		 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 347 return dpot_write_r8d8(dpot, ctrl, value);
59592d0c
MH		 348 case DPOT_UID(AD5171_ID):
349 case DPOT_UID(AD5273_ID):
350 if (reg & DPOT_ADDR_OTP) {
351 tmp = dpot_read_d8(dpot);
352 if (tmp >> 6) /* Ready to Program? */
353 return -EFAULT;
354 ctrl = DPOT_AD5273_FUSE;
355 }
356 return dpot_write_r8d8(dpot, ctrl, value);
59592d0c
MH		 357 case DPOT_UID(AD5172_ID):
358 case DPOT_UID(AD5173_ID):
359 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
5f400cf4 360 0 : DPOT_AD5172_3_A0;
59592d0c
MH		 361 if (reg & DPOT_ADDR_OTP) {
362 tmp = dpot_read_r8d16(dpot, ctrl);
363 if (tmp >> 14) /* Ready to Program? */
364 return -EFAULT;
5f400cf4 365 ctrl |= DPOT_AD5170_2_3_FUSE;
59592d0c
MH		 366 }
367 return dpot_write_r8d8(dpot, ctrl, value);
59592d0c
MH		 368 case DPOT_UID(AD5170_ID):
369 if (reg & DPOT_ADDR_OTP) {
370 tmp = dpot_read_r8d16(dpot, tmp);
371 if (tmp >> 14) /* Ready to Program? */
372 return -EFAULT;
a4bd3949 373 ctrl = DPOT_AD5170_2_3_FUSE;
59592d0c
MH		 374 }
375 return dpot_write_r8d8(dpot, ctrl, value);
a4bd3949
MH		 376 case DPOT_UID(AD5272_ID):
377 case DPOT_UID(AD5274_ID):
378 dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
379 DPOT_AD5270_1_2_4_UNLOCK_CMD);
380
381 if (reg & DPOT_ADDR_OTP)
382 return dpot_write_r8d8(dpot,
383 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
384
385 if (dpot->uid == DPOT_UID(AD5274_ID))
386 value = value << 2;
387
388 return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
389 (value >> 8), value & 0xFF);
e3ae6847 390 default:
c74cba61
MH		 391 if (reg & DPOT_ADDR_CMD)
392 return dpot_write_d8(dpot, reg);
e3ae6847 393
c74cba61
MH		 394 if (dpot->max_pos > 256)
395 return dpot_write_r8d16(dpot, (reg & 0xF8) |
396 ((reg & 0x7) << 1), value);
397 else
398 /* All other registers require instruction + data bytes */
399 return dpot_write_r8d8(dpot, reg, value);
e3ae6847
MH		 400 }
401}
402
e3ae6847
MH		 403static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
404{
405 if (dpot->feat & F_SPI)
406 return dpot_write_spi(dpot, reg, value);
407 else
408 return dpot_write_i2c(dpot, reg, value);
409}
410
4eb174be
MH		 411/* sysfs functions */
412
413static ssize_t sysfs_show_reg(struct device *dev,
6c536e4c
MH		 414 struct device_attribute *attr,
415 char *buf, u32 reg)
4eb174be 416{
6c536e4c 417 struct dpot_data *data = dev_get_drvdata(dev);
4eb174be
MH		 418 s32 value;
419
59592d0c
MH		 420 if (reg & DPOT_ADDR_OTP_EN)
421 return sprintf(buf, "%s\n",
422 test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
423 "enabled" : "disabled");
424
425
4eb174be 426 mutex_lock(&data->update_lock);
6c536e4c 427 value = dpot_read(data, reg);
4eb174be
MH		 428 mutex_unlock(&data->update_lock);
429
430 if (value < 0)
431 return -EINVAL;
432 /*
433 * Let someone else deal with converting this ...
434 * the tolerance is a two-byte value where the MSB
435 * is a sign + integer value, and the LSB is a
436 * decimal value. See page 18 of the AD5258
437 * datasheet (Rev. A) for more details.
438 */
439
6c536e4c 440 if (reg & DPOT_REG_TOL)
4eb174be
MH		 441 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
442 else
443 return sprintf(buf, "%u\n", value & data->rdac_mask);
444}
445
446static ssize_t sysfs_set_reg(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t count, u32 reg)
449{
6c536e4c 450 struct dpot_data *data = dev_get_drvdata(dev);
4eb174be
MH		 451 unsigned long value;
452 int err;
453
59592d0c 454 if (reg & DPOT_ADDR_OTP_EN) {
1bb850a1 455 if (sysfs_streq(buf, "enabled"))
59592d0c
MH		 456 set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
457 else
458 clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
459
460 return count;
461 }
462
463 if ((reg & DPOT_ADDR_OTP) &&
464 !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
465 return -EPERM;
466
f7b41276 467 err = kstrtoul(buf, 10, &value);
4eb174be
MH		 468 if (err)
469 return err;
470
471 if (value > data->rdac_mask)
472 value = data->rdac_mask;
473
474 mutex_lock(&data->update_lock);
6c536e4c
MH		 475 dpot_write(data, reg, value);
476 if (reg & DPOT_ADDR_EEPROM)
4eb174be 477 msleep(26); /* Sleep while the EEPROM updates */
59592d0c
MH		 478 else if (reg & DPOT_ADDR_OTP)
479 msleep(400); /* Sleep while the OTP updates */
4eb174be
MH		 480 mutex_unlock(&data->update_lock);
481
482 return count;
483}
484
485static ssize_t sysfs_do_cmd(struct device *dev,
486 struct device_attribute *attr,
487 const char *buf, size_t count, u32 reg)
488{
6c536e4c 489 struct dpot_data *data = dev_get_drvdata(dev);
4eb174be
MH		 490
491 mutex_lock(&data->update_lock);
6c536e4c 492 dpot_write(data, reg, 0);
4eb174be
MH		 493 mutex_unlock(&data->update_lock);
494
495 return count;
496}
497
498/* ------------------------------------------------------------------------- */
499
0993dbed
MH		 500#define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
501show_##_name(struct device *dev, \
502 struct device_attribute *attr, char *buf) \
503{ \
504 return sysfs_show_reg(dev, attr, buf, _reg); \
4eb174be
MH		 505}
506
0993dbed
MH		 507#define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
508set_##_name(struct device *dev, \
509 struct device_attribute *attr, \
510 const char *buf, size_t count) \
511{ \
512 return sysfs_set_reg(dev, attr, buf, count, _reg); \
4eb174be
MH		 513}
514
0993dbed
MH		 515#define DPOT_DEVICE_SHOW_SET(name, reg) \
516DPOT_DEVICE_SHOW(name, reg) \
517DPOT_DEVICE_SET(name, reg) \
518static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
4eb174be 519
0993dbed
MH		 520#define DPOT_DEVICE_SHOW_ONLY(name, reg) \
521DPOT_DEVICE_SHOW(name, reg) \
522static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
4eb174be 523
6c536e4c
MH		 524DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
525DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
526DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
59592d0c
MH		 527DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
528DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
6c536e4c
MH		 529
530DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
531DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
532DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
59592d0c
MH		 533DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
534DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
6c536e4c
MH		 535
536DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
537DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
538DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
59592d0c
MH		 539DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
540DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
6c536e4c
MH		 541
542DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
543DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
544DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
59592d0c
MH		 545DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
546DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
6c536e4c
MH		 547
548DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
549DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
550DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
59592d0c
MH		 551DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
552DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
6c536e4c
MH		 553
554DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
555DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
556DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
59592d0c
MH		 557DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
558DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
6c536e4c
MH		 559
560static const struct attribute *dpot_attrib_wipers[] = {
561 &dev_attr_rdac0.attr,
562 &dev_attr_rdac1.attr,
563 &dev_attr_rdac2.attr,
564 &dev_attr_rdac3.attr,
565 &dev_attr_rdac4.attr,
566 &dev_attr_rdac5.attr,
567 NULL
568};
569
570static const struct attribute *dpot_attrib_eeprom[] = {
571 &dev_attr_eeprom0.attr,
572 &dev_attr_eeprom1.attr,
573 &dev_attr_eeprom2.attr,
574 &dev_attr_eeprom3.attr,
575 &dev_attr_eeprom4.attr,
576 &dev_attr_eeprom5.attr,
577 NULL
4eb174be
MH		 578};
579
59592d0c
MH		 580static const struct attribute *dpot_attrib_otp[] = {
581 &dev_attr_otp0.attr,
582 &dev_attr_otp1.attr,
583 &dev_attr_otp2.attr,
584 &dev_attr_otp3.attr,
585 &dev_attr_otp4.attr,
586 &dev_attr_otp5.attr,
587 NULL
588};
589
590static const struct attribute *dpot_attrib_otp_en[] = {
591 &dev_attr_otp0en.attr,
592 &dev_attr_otp1en.attr,
593 &dev_attr_otp2en.attr,
594 &dev_attr_otp3en.attr,
595 &dev_attr_otp4en.attr,
596 &dev_attr_otp5en.attr,
597 NULL
598};
599
6c536e4c
MH		 600static const struct attribute *dpot_attrib_tolerance[] = {
601 &dev_attr_tolerance0.attr,
602 &dev_attr_tolerance1.attr,
603 &dev_attr_tolerance2.attr,
604 &dev_attr_tolerance3.attr,
605 &dev_attr_tolerance4.attr,
606 &dev_attr_tolerance5.attr,
607 NULL
4eb174be
MH		 608};
609
610/* ------------------------------------------------------------------------- */
611
0993dbed
MH		 612#define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
613set_##_name(struct device *dev, \
614 struct device_attribute *attr, \
615 const char *buf, size_t count) \
616{ \
617 return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
618} \
619static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
620
6c536e4c
MH		 621DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
622DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
623DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
624DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
4eb174be
MH		 625
626static struct attribute *ad525x_attributes_commands[] = {
627 &dev_attr_inc_all.attr,
628 &dev_attr_dec_all.attr,
629 &dev_attr_inc_all_6db.attr,
630 &dev_attr_dec_all_6db.attr,
631 NULL
632};
633
634static const struct attribute_group ad525x_group_commands = {
635 .attrs = ad525x_attributes_commands,
636};
637
1bdd2c45 638static int ad_dpot_add_files(struct device *dev,
6c536e4c 639 unsigned features, unsigned rdac)
4eb174be 640{
6c536e4c
MH		 641 int err = sysfs_create_file(&dev->kobj,
642 dpot_attrib_wipers[rdac]);
643 if (features & F_CMD_EEP)
644 err |= sysfs_create_file(&dev->kobj,
645 dpot_attrib_eeprom[rdac]);
646 if (features & F_CMD_TOL)
647 err |= sysfs_create_file(&dev->kobj,
648 dpot_attrib_tolerance[rdac]);
59592d0c
MH		 649 if (features & F_CMD_OTP) {
650 err |= sysfs_create_file(&dev->kobj,
651 dpot_attrib_otp_en[rdac]);
652 err |= sysfs_create_file(&dev->kobj,
653 dpot_attrib_otp[rdac]);
654 }
4eb174be 655
6c536e4c
MH		 656 if (err)
657 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
658 rdac);
659
660 return err;
4eb174be
MH		 661}
662
1bdd2c45 663static inline void ad_dpot_remove_files(struct device *dev,
6c536e4c 664 unsigned features, unsigned rdac)
4eb174be 665{
6c536e4c
MH		 666 sysfs_remove_file(&dev->kobj,
667 dpot_attrib_wipers[rdac]);
668 if (features & F_CMD_EEP)
669 sysfs_remove_file(&dev->kobj,
670 dpot_attrib_eeprom[rdac]);
671 if (features & F_CMD_TOL)
672 sysfs_remove_file(&dev->kobj,
673 dpot_attrib_tolerance[rdac]);
59592d0c
MH		 674 if (features & F_CMD_OTP) {
675 sysfs_remove_file(&dev->kobj,
676 dpot_attrib_otp_en[rdac]);
677 sysfs_remove_file(&dev->kobj,
678 dpot_attrib_otp[rdac]);
679 }
4eb174be
MH		 680}
681
80c8ae28 682int ad_dpot_probe(struct device *dev,
7f3379de
MH		 683 struct ad_dpot_bus_data *bdata, unsigned long devid,
684 const char *name)
4eb174be 685{
4eb174be 686
6c536e4c
MH		 687 struct dpot_data *data;
688 int i, err = 0;
4eb174be
MH		 689
690 data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
691 if (!data) {
692 err = -ENOMEM;
693 goto exit;
694 }
695
6c536e4c 696 dev_set_drvdata(dev, data);
4eb174be
MH		 697 mutex_init(&data->update_lock);
698
6c536e4c 699 data->bdata = *bdata;
7f3379de 700 data->devid = devid;
6c536e4c 701
7f3379de 702 data->max_pos = 1 << DPOT_MAX_POS(devid);
6c536e4c 703 data->rdac_mask = data->max_pos - 1;
7f3379de
MH		 704 data->feat = DPOT_FEAT(devid);
705 data->uid = DPOT_UID(devid);
706 data->wipers = DPOT_WIPERS(devid);
6c536e4c 707
59592d0c 708 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
6c536e4c
MH		 709 if (data->wipers & (1 << i)) {
710 err = ad_dpot_add_files(dev, data->feat, i);
711 if (err)
712 goto exit_remove_files;
713 /* power-up midscale */
714 if (data->feat & F_RDACS_WONLY)
715 data->rdac_cache[i] = data->max_pos / 2;
716 }
717
718 if (data->feat & F_CMD_INC)
719 err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
4eb174be
MH		 720
721 if (err) {
722 dev_err(dev, "failed to register sysfs hooks\n");
723 goto exit_free;
724 }
725
4eb174be 726 dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
7f3379de 727 name, data->max_pos);
4eb174be
MH		 728
729 return 0;
730
6c536e4c 731exit_remove_files:
59592d0c 732 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
6c536e4c
MH		 733 if (data->wipers & (1 << i))
734 ad_dpot_remove_files(dev, data->feat, i);
735
4eb174be
MH		 736exit_free:
737 kfree(data);
6c536e4c 738 dev_set_drvdata(dev, NULL);
4eb174be 739exit:
6c536e4c 740 dev_err(dev, "failed to create client for %s ID 0x%lX\n",
7f3379de 741 name, devid);
4eb174be
MH		 742 return err;
743}
6c536e4c 744EXPORT_SYMBOL(ad_dpot_probe);
4eb174be 745
0ed0d579 746int ad_dpot_remove(struct device *dev)
4eb174be 747{
6c536e4c
MH		 748 struct dpot_data *data = dev_get_drvdata(dev);
749 int i;
750
59592d0c 751 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
6c536e4c
MH		 752 if (data->wipers & (1 << i))
753 ad_dpot_remove_files(dev, data->feat, i);
4eb174be 754
4eb174be
MH		 755 kfree(data);
756
757 return 0;
758}
6c536e4c 759EXPORT_SYMBOL(ad_dpot_remove);
4eb174be 760
4eb174be
MH		 761
762MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
6c536e4c
MH		 763 "Michael Hennerich <hennerich@blackfin.uclinux.org>");
764MODULE_DESCRIPTION("Digital potentiometer driver");
4eb174be 765MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)