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ipc: optimize semget/shmget/msgget for lots of keys
[linux/fpc-iii.git] / drivers / misc / ad525x_dpot.c
blobfe1672747bc1fd2c3ea1d26ae6e7154dadd8d11f
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
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):
189 case DPOT_UID(AD5280_ID):
190 case DPOT_UID(AD5282_ID):
191 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
192 0 : DPOT_AD5282_RDAC_AB;
193 return dpot_read_r8d8(dpot, ctrl);
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) ?
201 0 : DPOT_AD5172_3_A0;
202 return dpot_read_r8d8(dpot, ctrl);
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
219 if (dpot->uid == DPOT_UID(AD5274_ID))
220 value = value >> 2;
221 return value;
222 default:
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);
228 }
229 }
230
231 static 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
239 static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
240 {
241 unsigned val = 0;
242
243 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
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) ||
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
272 return dpot_write_r8d8(dpot,
273 (DPOT_AD5291_RDAC << 2) |
274 (value >> 8), value & 0xFF);
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;
283
284 return dpot_write_r8d8(dpot,
285 (DPOT_AD5270_1_2_4_RDAC << 2) |
286 (value >> 8), value & 0xFF);
287 }
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 }
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 }
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);
324
325 return -EFAULT;
326 }
327
328 static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
329 {
330 /* Only write the instruction byte for certain commands */
331 unsigned tmp = 0, ctrl = 0;
332
333 switch (dpot->uid) {
334 case DPOT_UID(AD5246_ID):
335 case DPOT_UID(AD5247_ID):
336 return dpot_write_d8(dpot, value);
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 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);
357 case DPOT_UID(AD5172_ID):
358 case DPOT_UID(AD5173_ID):
359 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
360 0 : DPOT_AD5172_3_A0;
361 if (reg & DPOT_ADDR_OTP) {
362 tmp = dpot_read_r8d16(dpot, ctrl);
363 if (tmp >> 14) /* Ready to Program? */
364 return -EFAULT;
365 ctrl |= DPOT_AD5170_2_3_FUSE;
366 }
367 return dpot_write_r8d8(dpot, ctrl, value);
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;
373 ctrl = DPOT_AD5170_2_3_FUSE;
374 }
375 return dpot_write_r8d8(dpot, ctrl, value);
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);
390 default:
391 if (reg & DPOT_ADDR_CMD)
392 return dpot_write_d8(dpot, reg);
393
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);
400 }
401 }
402
403 static 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
411 /* sysfs functions */
412
413 static ssize_t sysfs_show_reg(struct device *dev,
414 struct device_attribute *attr,
415 char *buf, u32 reg)
416 {
417 struct dpot_data *data = dev_get_drvdata(dev);
418 s32 value;
419
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
426 mutex_lock(&data->update_lock);
427 value = dpot_read(data, reg);
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
440 if (reg & DPOT_REG_TOL)
441 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
442 else
443 return sprintf(buf, "%u\n", value & data->rdac_mask);
444 }
445
446 static ssize_t sysfs_set_reg(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t count, u32 reg)
449 {
450 struct dpot_data *data = dev_get_drvdata(dev);
451 unsigned long value;
452 int err;
453
454 if (reg & DPOT_ADDR_OTP_EN) {
455 if (sysfs_streq(buf, "enabled"))
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
467 err = kstrtoul(buf, 10, &value);
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);
475 dpot_write(data, reg, value);
476 if (reg & DPOT_ADDR_EEPROM)
477 msleep(26); /* Sleep while the EEPROM updates */
478 else if (reg & DPOT_ADDR_OTP)
479 msleep(400); /* Sleep while the OTP updates */
480 mutex_unlock(&data->update_lock);
481
482 return count;
483 }
484
485 static ssize_t sysfs_do_cmd(struct device *dev,
486 struct device_attribute *attr,
487 const char *buf, size_t count, u32 reg)
488 {
489 struct dpot_data *data = dev_get_drvdata(dev);
490
491 mutex_lock(&data->update_lock);
492 dpot_write(data, reg, 0);
493 mutex_unlock(&data->update_lock);
494
495 return count;
496 }
497
498 /* ------------------------------------------------------------------------- */
499
500 #define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
501 show_##_name(struct device *dev, \
502 struct device_attribute *attr, char *buf) \
503 { \
504 return sysfs_show_reg(dev, attr, buf, _reg); \
505 }
506
507 #define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
508 set_##_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); \
513 }
514
515 #define DPOT_DEVICE_SHOW_SET(name, reg) \
516 DPOT_DEVICE_SHOW(name, reg) \
517 DPOT_DEVICE_SET(name, reg) \
518 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
519
520 #define DPOT_DEVICE_SHOW_ONLY(name, reg) \
521 DPOT_DEVICE_SHOW(name, reg) \
522 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
523
524 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
525 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
526 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
527 DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
528 DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
529
530 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
531 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
532 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
533 DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
534 DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
535
536 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
537 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
538 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
539 DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
540 DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
541
542 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
543 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
544 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
545 DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
546 DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
547
548 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
549 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
550 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
551 DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
552 DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
553
554 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
555 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
556 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
557 DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
558 DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
559
560 static 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
570 static 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
578 };
579
580 static 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
590 static 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
600 static 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
608 };
609
610 /* ------------------------------------------------------------------------- */
611
612 #define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
613 set_##_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 } \
619 static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
620
621 DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
622 DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
623 DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
624 DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
625
626 static 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
634 static const struct attribute_group ad525x_group_commands = {
635 .attrs = ad525x_attributes_commands,
636 };
637
638 static int ad_dpot_add_files(struct device *dev,
639 unsigned features, unsigned rdac)
640 {
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]);
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 }
655
656 if (err)
657 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
658 rdac);
659
660 return err;
661 }
662
663 static inline void ad_dpot_remove_files(struct device *dev,
664 unsigned features, unsigned rdac)
665 {
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]);
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 }
680 }
681
682 int ad_dpot_probe(struct device *dev,
683 struct ad_dpot_bus_data *bdata, unsigned long devid,
684 const char *name)
685 {
686
687 struct dpot_data *data;
688 int i, err = 0;
689
690 data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
691 if (!data) {
692 err = -ENOMEM;
693 goto exit;
694 }
695
696 dev_set_drvdata(dev, data);
697 mutex_init(&data->update_lock);
698
699 data->bdata = *bdata;
700 data->devid = devid;
701
702 data->max_pos = 1 << DPOT_MAX_POS(devid);
703 data->rdac_mask = data->max_pos - 1;
704 data->feat = DPOT_FEAT(devid);
705 data->uid = DPOT_UID(devid);
706 data->wipers = DPOT_WIPERS(devid);
707
708 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
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);
720
721 if (err) {
722 dev_err(dev, "failed to register sysfs hooks\n");
723 goto exit_free;
724 }
725
726 dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
727 name, data->max_pos);
728
729 return 0;
730
731 exit_remove_files:
732 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
733 if (data->wipers & (1 << i))
734 ad_dpot_remove_files(dev, data->feat, i);
735
736 exit_free:
737 kfree(data);
738 dev_set_drvdata(dev, NULL);
739 exit:
740 dev_err(dev, "failed to create client for %s ID 0x%lX\n",
741 name, devid);
742 return err;
743 }
744 EXPORT_SYMBOL(ad_dpot_probe);
745
746 int ad_dpot_remove(struct device *dev)
747 {
748 struct dpot_data *data = dev_get_drvdata(dev);
749 int i;
750
751 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
752 if (data->wipers & (1 << i))
753 ad_dpot_remove_files(dev, data->feat, i);
754
755 kfree(data);
756
757 return 0;
758 }
759 EXPORT_SYMBOL(ad_dpot_remove);
760
761
762 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
763 "Michael Hennerich <hennerich@blackfin.uclinux.org>");
764 MODULE_DESCRIPTION("Digital potentiometer driver");
765 MODULE_LICENSE("GPL");
Linux with added FPC-III support