ad525x_dpot: add support for one time programmable pots
[linux-2.6.git] / drivers / misc / ad525x_dpot.c
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
33  * AD5292               1               1024            20
34  * AD5293               1               1024            20
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  *
56  * See Documentation/misc-devices/ad525x_dpot.txt for more info.
57  *
58  * derived from ad5258.c
59  * Copyright (c) 2009 Cyber Switching, Inc.
60  * Author: Chris Verges <chrisv@cyberswitching.com>
61  *
62  * derived from ad5252.c
63  * Copyright (c) 2006 Michael Hennerich <hennerich@blackfin.uclinux.org>
64  *
65  * Licensed under the GPL-2 or later.
66  */
67
68 #include <linux/module.h>
69 #include <linux/device.h>
70 #include <linux/kernel.h>
71 #include <linux/init.h>
72 #include <linux/delay.h>
73 #include <linux/slab.h>
74
75 #define DRIVER_VERSION                  "0.2"
76
77 #include "ad525x_dpot.h"
78
79 /*
80  * Client data (each client gets its own)
81  */
82
83 struct dpot_data {
84         struct ad_dpot_bus_data bdata;
85         struct mutex update_lock;
86         unsigned rdac_mask;
87         unsigned max_pos;
88         unsigned long devid;
89         unsigned uid;
90         unsigned feat;
91         unsigned wipers;
92         u16 rdac_cache[MAX_RDACS];
93         DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
94 };
95
96 static inline int dpot_read_d8(struct dpot_data *dpot)
97 {
98         return dpot->bdata.bops->read_d8(dpot->bdata.client);
99 }
100
101 static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg)
102 {
103         return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg);
104 }
105
106 static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg)
107 {
108         return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg);
109 }
110
111 static inline int dpot_write_d8(struct dpot_data *dpot, u8 val)
112 {
113         return dpot->bdata.bops->write_d8(dpot->bdata.client, val);
114 }
115
116 static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val)
117 {
118         return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val);
119 }
120
121 static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
122 {
123         return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
124 }
125
126 static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
127 {
128         unsigned ctrl = 0;
129
130         if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
131
132                 if (dpot->feat & F_RDACS_WONLY)
133                         return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
134
135                 if (dpot->uid == DPOT_UID(AD5291_ID) ||
136                         dpot->uid == DPOT_UID(AD5292_ID) ||
137                         dpot->uid == DPOT_UID(AD5293_ID))
138                         return dpot_read_r8d8(dpot,
139                                 DPOT_AD5291_READ_RDAC << 2);
140
141                 ctrl = DPOT_SPI_READ_RDAC;
142         } else if (reg & DPOT_ADDR_EEPROM) {
143                 ctrl = DPOT_SPI_READ_EEPROM;
144         }
145
146         if (dpot->feat & F_SPI_16BIT)
147                 return dpot_read_r8d8(dpot, ctrl);
148         else if (dpot->feat & F_SPI_24BIT)
149                 return dpot_read_r8d16(dpot, ctrl);
150
151         return -EFAULT;
152 }
153
154 static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
155 {
156         unsigned ctrl = 0;
157         switch (dpot->uid) {
158         case DPOT_UID(AD5246_ID):
159         case DPOT_UID(AD5247_ID):
160                 return dpot_read_d8(dpot);
161         case DPOT_UID(AD5245_ID):
162         case DPOT_UID(AD5241_ID):
163         case DPOT_UID(AD5242_ID):
164         case DPOT_UID(AD5243_ID):
165         case DPOT_UID(AD5248_ID):
166         case DPOT_UID(AD5280_ID):
167         case DPOT_UID(AD5282_ID):
168                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
169                         0 : DPOT_AD5291_RDAC_AB;
170                 return dpot_read_r8d8(dpot, ctrl);
171         case DPOT_UID(AD5170_ID):
172         case DPOT_UID(AD5171_ID):
173         case DPOT_UID(AD5273_ID):
174                         return dpot_read_d8(dpot);
175         case DPOT_UID(AD5172_ID):
176         case DPOT_UID(AD5173_ID):
177                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
178                         0 : DPOT_AD5272_3_A0;
179                 return dpot_read_r8d8(dpot, ctrl);
180         default:
181                 if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
182                         return dpot_read_r8d16(dpot, (reg & 0xF8) |
183                                         ((reg & 0x7) << 1));
184                 else
185                         return dpot_read_r8d8(dpot, reg);
186         }
187 }
188
189 static s32 dpot_read(struct dpot_data *dpot, u8 reg)
190 {
191         if (dpot->feat & F_SPI)
192                 return dpot_read_spi(dpot, reg);
193         else
194                 return dpot_read_i2c(dpot, reg);
195 }
196
197 static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
198 {
199         unsigned val = 0;
200
201         if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
202                 if (dpot->feat & F_RDACS_WONLY)
203                         dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
204
205                 if (dpot->feat & F_AD_APPDATA) {
206                         if (dpot->feat & F_SPI_8BIT) {
207                                 val = ((reg & DPOT_RDAC_MASK) <<
208                                         DPOT_MAX_POS(dpot->devid)) |
209                                         value;
210                                 return dpot_write_d8(dpot, val);
211                         } else if (dpot->feat & F_SPI_16BIT) {
212                                 val = ((reg & DPOT_RDAC_MASK) <<
213                                         DPOT_MAX_POS(dpot->devid)) |
214                                         value;
215                                 return dpot_write_r8d8(dpot, val >> 8,
216                                         val & 0xFF);
217                         } else
218                                 BUG();
219                 } else {
220                         if (dpot->uid == DPOT_UID(AD5291_ID) ||
221                                 dpot->uid == DPOT_UID(AD5292_ID) ||
222                                 dpot->uid == DPOT_UID(AD5293_ID))
223                                 return dpot_write_r8d8(dpot,
224                                         (DPOT_AD5291_RDAC << 2) |
225                                         (value >> 8), value & 0xFF);
226
227                         val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
228                 }
229         } else if (reg & DPOT_ADDR_EEPROM) {
230                 val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
231         } else if (reg & DPOT_ADDR_CMD) {
232                 switch (reg) {
233                 case DPOT_DEC_ALL_6DB:
234                         val = DPOT_SPI_DEC_ALL_6DB;
235                         break;
236                 case DPOT_INC_ALL_6DB:
237                         val = DPOT_SPI_INC_ALL_6DB;
238                         break;
239                 case DPOT_DEC_ALL:
240                         val = DPOT_SPI_DEC_ALL;
241                         break;
242                 case DPOT_INC_ALL:
243                         val = DPOT_SPI_INC_ALL;
244                         break;
245                 }
246         } else
247                 BUG();
248
249         if (dpot->feat & F_SPI_16BIT)
250                 return dpot_write_r8d8(dpot, val, value);
251         else if (dpot->feat & F_SPI_24BIT)
252                 return dpot_write_r8d16(dpot, val, value);
253
254         return -EFAULT;
255 }
256
257 static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
258 {
259         /* Only write the instruction byte for certain commands */
260         unsigned tmp = 0, ctrl = 0;
261
262         switch (dpot->uid) {
263         case DPOT_UID(AD5246_ID):
264         case DPOT_UID(AD5247_ID):
265                 return dpot_write_d8(dpot, value);
266                 break;
267
268         case DPOT_UID(AD5245_ID):
269         case DPOT_UID(AD5241_ID):
270         case DPOT_UID(AD5242_ID):
271         case DPOT_UID(AD5243_ID):
272         case DPOT_UID(AD5248_ID):
273         case DPOT_UID(AD5280_ID):
274         case DPOT_UID(AD5282_ID):
275                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
276                         0 : DPOT_AD5291_RDAC_AB;
277                 return dpot_write_r8d8(dpot, ctrl, value);
278                 break;
279         case DPOT_UID(AD5171_ID):
280         case DPOT_UID(AD5273_ID):
281                 if (reg & DPOT_ADDR_OTP) {
282                         tmp = dpot_read_d8(dpot);
283                         if (tmp >> 6) /* Ready to Program? */
284                                 return -EFAULT;
285                         ctrl = DPOT_AD5273_FUSE;
286                 }
287                 return dpot_write_r8d8(dpot, ctrl, value);
288                 break;
289         case DPOT_UID(AD5172_ID):
290         case DPOT_UID(AD5173_ID):
291                 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
292                         0 : DPOT_AD5272_3_A0;
293                 if (reg & DPOT_ADDR_OTP) {
294                         tmp = dpot_read_r8d16(dpot, ctrl);
295                         if (tmp >> 14) /* Ready to Program? */
296                                 return -EFAULT;
297                         ctrl |= DPOT_AD5270_2_3_FUSE;
298                 }
299                 return dpot_write_r8d8(dpot, ctrl, value);
300                 break;
301         case DPOT_UID(AD5170_ID):
302                 if (reg & DPOT_ADDR_OTP) {
303                         tmp = dpot_read_r8d16(dpot, tmp);
304                         if (tmp >> 14) /* Ready to Program? */
305                                 return -EFAULT;
306                         ctrl = DPOT_AD5270_2_3_FUSE;
307                 }
308                 return dpot_write_r8d8(dpot, ctrl, value);
309                 break;
310         default:
311                 if (reg & DPOT_ADDR_CMD)
312                         return dpot_write_d8(dpot, reg);
313
314                 if (dpot->max_pos > 256)
315                         return dpot_write_r8d16(dpot, (reg & 0xF8) |
316                                                 ((reg & 0x7) << 1), value);
317                 else
318                         /* All other registers require instruction + data bytes */
319                         return dpot_write_r8d8(dpot, reg, value);
320         }
321 }
322
323
324 static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
325 {
326         if (dpot->feat & F_SPI)
327                 return dpot_write_spi(dpot, reg, value);
328         else
329                 return dpot_write_i2c(dpot, reg, value);
330 }
331
332 /* sysfs functions */
333
334 static ssize_t sysfs_show_reg(struct device *dev,
335                               struct device_attribute *attr,
336                               char *buf, u32 reg)
337 {
338         struct dpot_data *data = dev_get_drvdata(dev);
339         s32 value;
340
341         if (reg & DPOT_ADDR_OTP_EN)
342                 return sprintf(buf, "%s\n",
343                         test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
344                         "enabled" : "disabled");
345
346
347         mutex_lock(&data->update_lock);
348         value = dpot_read(data, reg);
349         mutex_unlock(&data->update_lock);
350
351         if (value < 0)
352                 return -EINVAL;
353         /*
354          * Let someone else deal with converting this ...
355          * the tolerance is a two-byte value where the MSB
356          * is a sign + integer value, and the LSB is a
357          * decimal value.  See page 18 of the AD5258
358          * datasheet (Rev. A) for more details.
359          */
360
361         if (reg & DPOT_REG_TOL)
362                 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
363         else
364                 return sprintf(buf, "%u\n", value & data->rdac_mask);
365 }
366
367 static ssize_t sysfs_set_reg(struct device *dev,
368                              struct device_attribute *attr,
369                              const char *buf, size_t count, u32 reg)
370 {
371         struct dpot_data *data = dev_get_drvdata(dev);
372         unsigned long value;
373         int err;
374
375         if (reg & DPOT_ADDR_OTP_EN) {
376                 if (!strncmp(buf, "enabled", sizeof("enabled")))
377                         set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
378                 else
379                         clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
380
381                 return count;
382         }
383
384         if ((reg & DPOT_ADDR_OTP) &&
385                 !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
386                 return -EPERM;
387
388         err = strict_strtoul(buf, 10, &value);
389         if (err)
390                 return err;
391
392         if (value > data->rdac_mask)
393                 value = data->rdac_mask;
394
395         mutex_lock(&data->update_lock);
396         dpot_write(data, reg, value);
397         if (reg & DPOT_ADDR_EEPROM)
398                 msleep(26);     /* Sleep while the EEPROM updates */
399         else if (reg & DPOT_ADDR_OTP)
400                 msleep(400);    /* Sleep while the OTP updates */
401         mutex_unlock(&data->update_lock);
402
403         return count;
404 }
405
406 static ssize_t sysfs_do_cmd(struct device *dev,
407                             struct device_attribute *attr,
408                             const char *buf, size_t count, u32 reg)
409 {
410         struct dpot_data *data = dev_get_drvdata(dev);
411
412         mutex_lock(&data->update_lock);
413         dpot_write(data, reg, 0);
414         mutex_unlock(&data->update_lock);
415
416         return count;
417 }
418
419 /* ------------------------------------------------------------------------- */
420
421 #define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
422 show_##_name(struct device *dev, \
423                           struct device_attribute *attr, char *buf) \
424 { \
425         return sysfs_show_reg(dev, attr, buf, _reg); \
426 }
427
428 #define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
429 set_##_name(struct device *dev, \
430                          struct device_attribute *attr, \
431                          const char *buf, size_t count) \
432 { \
433         return sysfs_set_reg(dev, attr, buf, count, _reg); \
434 }
435
436 #define DPOT_DEVICE_SHOW_SET(name, reg) \
437 DPOT_DEVICE_SHOW(name, reg) \
438 DPOT_DEVICE_SET(name, reg) \
439 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
440
441 #define DPOT_DEVICE_SHOW_ONLY(name, reg) \
442 DPOT_DEVICE_SHOW(name, reg) \
443 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
444
445 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
446 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
447 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
448 DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
449 DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
450
451 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
452 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
453 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
454 DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
455 DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
456
457 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
458 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
459 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
460 DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
461 DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
462
463 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
464 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
465 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
466 DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
467 DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
468
469 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
470 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
471 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
472 DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
473 DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
474
475 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
476 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
477 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
478 DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
479 DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
480
481 static const struct attribute *dpot_attrib_wipers[] = {
482         &dev_attr_rdac0.attr,
483         &dev_attr_rdac1.attr,
484         &dev_attr_rdac2.attr,
485         &dev_attr_rdac3.attr,
486         &dev_attr_rdac4.attr,
487         &dev_attr_rdac5.attr,
488         NULL
489 };
490
491 static const struct attribute *dpot_attrib_eeprom[] = {
492         &dev_attr_eeprom0.attr,
493         &dev_attr_eeprom1.attr,
494         &dev_attr_eeprom2.attr,
495         &dev_attr_eeprom3.attr,
496         &dev_attr_eeprom4.attr,
497         &dev_attr_eeprom5.attr,
498         NULL
499 };
500
501 static const struct attribute *dpot_attrib_otp[] = {
502         &dev_attr_otp0.attr,
503         &dev_attr_otp1.attr,
504         &dev_attr_otp2.attr,
505         &dev_attr_otp3.attr,
506         &dev_attr_otp4.attr,
507         &dev_attr_otp5.attr,
508         NULL
509 };
510
511 static const struct attribute *dpot_attrib_otp_en[] = {
512         &dev_attr_otp0en.attr,
513         &dev_attr_otp1en.attr,
514         &dev_attr_otp2en.attr,
515         &dev_attr_otp3en.attr,
516         &dev_attr_otp4en.attr,
517         &dev_attr_otp5en.attr,
518         NULL
519 };
520
521 static const struct attribute *dpot_attrib_tolerance[] = {
522         &dev_attr_tolerance0.attr,
523         &dev_attr_tolerance1.attr,
524         &dev_attr_tolerance2.attr,
525         &dev_attr_tolerance3.attr,
526         &dev_attr_tolerance4.attr,
527         &dev_attr_tolerance5.attr,
528         NULL
529 };
530
531 /* ------------------------------------------------------------------------- */
532
533 #define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
534 set_##_name(struct device *dev, \
535                          struct device_attribute *attr, \
536                          const char *buf, size_t count) \
537 { \
538         return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
539 } \
540 static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
541
542 DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
543 DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
544 DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
545 DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
546
547 static struct attribute *ad525x_attributes_commands[] = {
548         &dev_attr_inc_all.attr,
549         &dev_attr_dec_all.attr,
550         &dev_attr_inc_all_6db.attr,
551         &dev_attr_dec_all_6db.attr,
552         NULL
553 };
554
555 static const struct attribute_group ad525x_group_commands = {
556         .attrs = ad525x_attributes_commands,
557 };
558
559 __devinit int ad_dpot_add_files(struct device *dev,
560                 unsigned features, unsigned rdac)
561 {
562         int err = sysfs_create_file(&dev->kobj,
563                 dpot_attrib_wipers[rdac]);
564         if (features & F_CMD_EEP)
565                 err |= sysfs_create_file(&dev->kobj,
566                         dpot_attrib_eeprom[rdac]);
567         if (features & F_CMD_TOL)
568                 err |= sysfs_create_file(&dev->kobj,
569                         dpot_attrib_tolerance[rdac]);
570         if (features & F_CMD_OTP) {
571                 err |= sysfs_create_file(&dev->kobj,
572                         dpot_attrib_otp_en[rdac]);
573                 err |= sysfs_create_file(&dev->kobj,
574                         dpot_attrib_otp[rdac]);
575         }
576
577         if (err)
578                 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
579                         rdac);
580
581         return err;
582 }
583
584 inline void ad_dpot_remove_files(struct device *dev,
585                 unsigned features, unsigned rdac)
586 {
587         sysfs_remove_file(&dev->kobj,
588                 dpot_attrib_wipers[rdac]);
589         if (features & F_CMD_EEP)
590                 sysfs_remove_file(&dev->kobj,
591                         dpot_attrib_eeprom[rdac]);
592         if (features & F_CMD_TOL)
593                 sysfs_remove_file(&dev->kobj,
594                         dpot_attrib_tolerance[rdac]);
595         if (features & F_CMD_OTP) {
596                 sysfs_remove_file(&dev->kobj,
597                         dpot_attrib_otp_en[rdac]);
598                 sysfs_remove_file(&dev->kobj,
599                         dpot_attrib_otp[rdac]);
600         }
601 }
602
603 __devinit int ad_dpot_probe(struct device *dev,
604                 struct ad_dpot_bus_data *bdata, const struct ad_dpot_id *id)
605 {
606
607         struct dpot_data *data;
608         int i, err = 0;
609
610         data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
611         if (!data) {
612                 err = -ENOMEM;
613                 goto exit;
614         }
615
616         dev_set_drvdata(dev, data);
617         mutex_init(&data->update_lock);
618
619         data->bdata = *bdata;
620         data->devid = id->devid;
621
622         data->max_pos = 1 << DPOT_MAX_POS(data->devid);
623         data->rdac_mask = data->max_pos - 1;
624         data->feat = DPOT_FEAT(data->devid);
625         data->uid = DPOT_UID(data->devid);
626         data->wipers = DPOT_WIPERS(data->devid);
627
628         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
629                 if (data->wipers & (1 << i)) {
630                         err = ad_dpot_add_files(dev, data->feat, i);
631                         if (err)
632                                 goto exit_remove_files;
633                         /* power-up midscale */
634                         if (data->feat & F_RDACS_WONLY)
635                                 data->rdac_cache[i] = data->max_pos / 2;
636                 }
637
638         if (data->feat & F_CMD_INC)
639                 err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
640
641         if (err) {
642                 dev_err(dev, "failed to register sysfs hooks\n");
643                 goto exit_free;
644         }
645
646         dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
647                  id->name, data->max_pos);
648
649         return 0;
650
651 exit_remove_files:
652         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
653                 if (data->wipers & (1 << i))
654                         ad_dpot_remove_files(dev, data->feat, i);
655
656 exit_free:
657         kfree(data);
658         dev_set_drvdata(dev, NULL);
659 exit:
660         dev_err(dev, "failed to create client for %s ID 0x%lX\n",
661                         id->name, id->devid);
662         return err;
663 }
664 EXPORT_SYMBOL(ad_dpot_probe);
665
666 __devexit int ad_dpot_remove(struct device *dev)
667 {
668         struct dpot_data *data = dev_get_drvdata(dev);
669         int i;
670
671         for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
672                 if (data->wipers & (1 << i))
673                         ad_dpot_remove_files(dev, data->feat, i);
674
675         kfree(data);
676
677         return 0;
678 }
679 EXPORT_SYMBOL(ad_dpot_remove);
680
681
682 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
683               "Michael Hennerich <hennerich@blackfin.uclinux.org>");
684 MODULE_DESCRIPTION("Digital potentiometer driver");
685 MODULE_LICENSE("GPL");
686 MODULE_VERSION(DRIVER_VERSION);