?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'for-next-3.17' of git://git.samba.org/sfrench/cifs-2.6
[linux/fpc-iii.git] / drivers / misc / ad525x_dpot.c
bloba43053daad0ec6698e39475f02499b955a12f66a
1 /*
2 * ad525x_dpot: Driver for the Analog Devices digital potentiometers
3 * Copyright (c) 2009-2010 Analog Devices, Inc.
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
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
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
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
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
47 * AD5280 1 256 20, 50, 200
48 * AD5282 2 256 20, 50, 200
49 * ADN2860 3 512 25, 250
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)
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)
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
67 * Copyright (c) 2006-2011 Michael Hennerich <hennerich@blackfin.uclinux.org>
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>
75 #include <linux/delay.h>
76 #include <linux/slab.h>
77
78 #include "ad525x_dpot.h"
79
80 /*
81 * Client data (each client gets its own)
82 */
83
84 struct dpot_data {
85 struct ad_dpot_bus_data bdata;
86 struct mutex update_lock;
87 unsigned rdac_mask;
88 unsigned max_pos;
89 unsigned long devid;
90 unsigned uid;
91 unsigned feat;
92 unsigned wipers;
93 u16 rdac_cache[MAX_RDACS];
94 DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
95 };
96
97 static inline int dpot_read_d8(struct dpot_data *dpot)
98 {
99 return dpot->bdata.bops->read_d8(dpot->bdata.client);
100 }
101
102 static 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
107 static 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
112 static 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
117 static 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
122 static 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
127 static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
128 {
129 unsigned ctrl = 0;
130 int value;
131
132 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
133
134 if (dpot->feat & F_RDACS_WONLY)
135 return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
136 if (dpot->uid == DPOT_UID(AD5291_ID) ||
137 dpot->uid == DPOT_UID(AD5292_ID) ||
138 dpot->uid == DPOT_UID(AD5293_ID)) {
139
140 value = dpot_read_r8d8(dpot,
141 DPOT_AD5291_READ_RDAC << 2);
142
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
162 ctrl = DPOT_SPI_READ_RDAC;
163 } else if (reg & DPOT_ADDR_EEPROM) {
164 ctrl = DPOT_SPI_READ_EEPROM;
165 }
166
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);
171
172 return -EFAULT;
173 }
174
175 static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
176 {
177 int value;
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):
188 case DPOT_UID(AD5280_ID):
189 case DPOT_UID(AD5282_ID):
190 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
191 0 : DPOT_AD5282_RDAC_AB;
192 return dpot_read_r8d8(dpot, ctrl);
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) ?
200 0 : DPOT_AD5172_3_A0;
201 return dpot_read_r8d8(dpot, ctrl);
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;
221 default:
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);
227 }
228 }
229
230 static 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
238 static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
239 {
240 unsigned val = 0;
241
242 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
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) ||
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
271 return dpot_write_r8d8(dpot,
272 (DPOT_AD5291_RDAC << 2) |
273 (value >> 8), value & 0xFF);
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;
282
283 return dpot_write_r8d8(dpot,
284 (DPOT_AD5270_1_2_4_RDAC << 2) |
285 (value >> 8), value & 0xFF);
286 }
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 }
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 }
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);
323
324 return -EFAULT;
325 }
326
327 static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
328 {
329 /* Only write the instruction byte for certain commands */
330 unsigned tmp = 0, ctrl = 0;
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):
343 case DPOT_UID(AD5280_ID):
344 case DPOT_UID(AD5282_ID):
345 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
346 0 : DPOT_AD5282_RDAC_AB;
347 return dpot_write_r8d8(dpot, ctrl, value);
348 break;
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) ?
362 0 : DPOT_AD5172_3_A0;
363 if (reg & DPOT_ADDR_OTP) {
364 tmp = dpot_read_r8d16(dpot, ctrl);
365 if (tmp >> 14) /* Ready to Program? */
366 return -EFAULT;
367 ctrl |= DPOT_AD5170_2_3_FUSE;
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;
376 ctrl = DPOT_AD5170_2_3_FUSE;
377 }
378 return dpot_write_r8d8(dpot, ctrl, value);
379 break;
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;
395 default:
396 if (reg & DPOT_ADDR_CMD)
397 return dpot_write_d8(dpot, reg);
398
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);
405 }
406 }
407
408 static 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
416 /* sysfs functions */
417
418 static ssize_t sysfs_show_reg(struct device *dev,
419 struct device_attribute *attr,
420 char *buf, u32 reg)
421 {
422 struct dpot_data *data = dev_get_drvdata(dev);
423 s32 value;
424
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
431 mutex_lock(&data->update_lock);
432 value = dpot_read(data, reg);
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
445 if (reg & DPOT_REG_TOL)
446 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
447 else
448 return sprintf(buf, "%u\n", value & data->rdac_mask);
449 }
450
451 static ssize_t sysfs_set_reg(struct device *dev,
452 struct device_attribute *attr,
453 const char *buf, size_t count, u32 reg)
454 {
455 struct dpot_data *data = dev_get_drvdata(dev);
456 unsigned long value;
457 int err;
458
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
472 err = kstrtoul(buf, 10, &value);
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);
480 dpot_write(data, reg, value);
481 if (reg & DPOT_ADDR_EEPROM)
482 msleep(26); /* Sleep while the EEPROM updates */
483 else if (reg & DPOT_ADDR_OTP)
484 msleep(400); /* Sleep while the OTP updates */
485 mutex_unlock(&data->update_lock);
486
487 return count;
488 }
489
490 static ssize_t sysfs_do_cmd(struct device *dev,
491 struct device_attribute *attr,
492 const char *buf, size_t count, u32 reg)
493 {
494 struct dpot_data *data = dev_get_drvdata(dev);
495
496 mutex_lock(&data->update_lock);
497 dpot_write(data, reg, 0);
498 mutex_unlock(&data->update_lock);
499
500 return count;
501 }
502
503 /* ------------------------------------------------------------------------- */
504
505 #define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
506 show_##_name(struct device *dev, \
507 struct device_attribute *attr, char *buf) \
508 { \
509 return sysfs_show_reg(dev, attr, buf, _reg); \
510 }
511
512 #define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
513 set_##_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); \
518 }
519
520 #define DPOT_DEVICE_SHOW_SET(name, reg) \
521 DPOT_DEVICE_SHOW(name, reg) \
522 DPOT_DEVICE_SET(name, reg) \
523 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
524
525 #define DPOT_DEVICE_SHOW_ONLY(name, reg) \
526 DPOT_DEVICE_SHOW(name, reg) \
527 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
528
529 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
530 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
531 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
532 DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
533 DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
534
535 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
536 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
537 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
538 DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
539 DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
540
541 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
542 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
543 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
544 DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
545 DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
546
547 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
548 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
549 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
550 DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
551 DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
552
553 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
554 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
555 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
556 DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
557 DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
558
559 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
560 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
561 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
562 DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
563 DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
564
565 static 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
575 static 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
583 };
584
585 static 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
595 static 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
605 static 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
613 };
614
615 /* ------------------------------------------------------------------------- */
616
617 #define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
618 set_##_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 } \
624 static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
625
626 DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
627 DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
628 DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
629 DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
630
631 static 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
639 static const struct attribute_group ad525x_group_commands = {
640 .attrs = ad525x_attributes_commands,
641 };
642
643 static int ad_dpot_add_files(struct device *dev,
644 unsigned features, unsigned rdac)
645 {
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]);
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 }
660
661 if (err)
662 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
663 rdac);
664
665 return err;
666 }
667
668 static inline void ad_dpot_remove_files(struct device *dev,
669 unsigned features, unsigned rdac)
670 {
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]);
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 }
685 }
686
687 int ad_dpot_probe(struct device *dev,
688 struct ad_dpot_bus_data *bdata, unsigned long devid,
689 const char *name)
690 {
691
692 struct dpot_data *data;
693 int i, err = 0;
694
695 data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
696 if (!data) {
697 err = -ENOMEM;
698 goto exit;
699 }
700
701 dev_set_drvdata(dev, data);
702 mutex_init(&data->update_lock);
703
704 data->bdata = *bdata;
705 data->devid = devid;
706
707 data->max_pos = 1 << DPOT_MAX_POS(devid);
708 data->rdac_mask = data->max_pos - 1;
709 data->feat = DPOT_FEAT(devid);
710 data->uid = DPOT_UID(devid);
711 data->wipers = DPOT_WIPERS(devid);
712
713 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
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);
725
726 if (err) {
727 dev_err(dev, "failed to register sysfs hooks\n");
728 goto exit_free;
729 }
730
731 dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
732 name, data->max_pos);
733
734 return 0;
735
736 exit_remove_files:
737 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
738 if (data->wipers & (1 << i))
739 ad_dpot_remove_files(dev, data->feat, i);
740
741 exit_free:
742 kfree(data);
743 dev_set_drvdata(dev, NULL);
744 exit:
745 dev_err(dev, "failed to create client for %s ID 0x%lX\n",
746 name, devid);
747 return err;
748 }
749 EXPORT_SYMBOL(ad_dpot_probe);
750
751 int ad_dpot_remove(struct device *dev)
752 {
753 struct dpot_data *data = dev_get_drvdata(dev);
754 int i;
755
756 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
757 if (data->wipers & (1 << i))
758 ad_dpot_remove_files(dev, data->feat, i);
759
760 kfree(data);
761
762 return 0;
763 }
764 EXPORT_SYMBOL(ad_dpot_remove);
765
766
767 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
768 "Michael Hennerich <hennerich@blackfin.uclinux.org>");
769 MODULE_DESCRIPTION("Digital potentiometer driver");
770 MODULE_LICENSE("GPL");
Linux with added FPC-III support