1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ad525x_dpot: Driver for the Analog Devices digital potentiometers
4 * Copyright (c) 2009-2010 Analog Devices, Inc.
5 * Author: Michael Hennerich <michael.hennerich@analog.com>
6 *
7 * DEVID #Wipers #Positions Resistor Options (kOhm)
8 * AD5258 1 64 1, 10, 50, 100
9 * AD5259 1 256 5, 10, 50, 100
10 * AD5251 2 64 1, 10, 50, 100
11 * AD5252 2 256 1, 10, 50, 100
12 * AD5255 3 512 25, 250
13 * AD5253 4 64 1, 10, 50, 100
14 * AD5254 4 256 1, 10, 50, 100
15 * AD5160 1 256 5, 10, 50, 100
16 * AD5161 1 256 5, 10, 50, 100
17 * AD5162 2 256 2.5, 10, 50, 100
18 * AD5165 1 256 100
19 * AD5200 1 256 10, 50
20 * AD5201 1 33 10, 50
21 * AD5203 4 64 10, 100
22 * AD5204 4 256 10, 50, 100
23 * AD5206 6 256 10, 50, 100
24 * AD5207 2 256 10, 50, 100
25 * AD5231 1 1024 10, 50, 100
26 * AD5232 2 256 10, 50, 100
27 * AD5233 4 64 10, 50, 100
28 * AD5235 2 1024 25, 250
29 * AD5260 1 256 20, 50, 200
30 * AD5262 2 256 20, 50, 200
31 * AD5263 4 256 20, 50, 200
32 * AD5290 1 256 10, 50, 100
33 * AD5291 1 256 20, 50, 100 (20-TP)
34 * AD5292 1 1024 20, 50, 100 (20-TP)
35 * AD5293 1 1024 20, 50, 100
36 * AD7376 1 128 10, 50, 100, 1M
37 * AD8400 1 256 1, 10, 50, 100
38 * AD8402 2 256 1, 10, 50, 100
39 * AD8403 4 256 1, 10, 50, 100
40 * ADN2850 3 512 25, 250
41 * AD5241 1 256 10, 100, 1M
42 * AD5246 1 128 5, 10, 50, 100
43 * AD5247 1 128 5, 10, 50, 100
44 * AD5245 1 256 5, 10, 50, 100
45 * AD5243 2 256 2.5, 10, 50, 100
46 * AD5248 2 256 2.5, 10, 50, 100
47 * AD5242 2 256 20, 50, 200
48 * AD5280 1 256 20, 50, 200
49 * AD5282 2 256 20, 50, 200
50 * ADN2860 3 512 25, 250
51 * AD5273 1 64 1, 10, 50, 100 (OTP)
52 * AD5171 1 64 5, 10, 50, 100 (OTP)
53 * AD5170 1 256 2.5, 10, 50, 100 (OTP)
54 * AD5172 2 256 2.5, 10, 50, 100 (OTP)
55 * AD5173 2 256 2.5, 10, 50, 100 (OTP)
56 * AD5270 1 1024 20, 50, 100 (50-TP)
57 * AD5271 1 256 20, 50, 100 (50-TP)
58 * AD5272 1 1024 20, 50, 100 (50-TP)
59 * AD5274 1 256 20, 50, 100 (50-TP)
60 *
61 * See Documentation/misc-devices/ad525x_dpot.txt for more info.
62 *
63 * derived from ad5258.c
64 * Copyright (c) 2009 Cyber Switching, Inc.
65 * Author: Chris Verges <chrisv@cyberswitching.com>
66 *
67 * derived from ad5252.c
68 * Copyright (c) 2006-2011 Michael Hennerich <michael.hennerich@analog.com>
69 */
70
71 #include <linux/module.h>
72 #include <linux/device.h>
73 #include <linux/kernel.h>
74 #include <linux/delay.h>
75 #include <linux/slab.h>
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 int rdac_mask;
87 unsigned int max_pos;
88 unsigned long devid;
89 unsigned int uid;
90 unsigned int feat;
91 unsigned int wipers;
92 u16 rdac_cache[MAX_RDACS];
93 DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
94 };
95
dpot_read_d8(struct dpot_data * dpot)96 static inline int dpot_read_d8(struct dpot_data *dpot)
97 {
98 return dpot->bdata.bops->read_d8(dpot->bdata.client);
99 }
100
dpot_read_r8d8(struct dpot_data * dpot,u8 reg)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
dpot_read_r8d16(struct dpot_data * dpot,u8 reg)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
dpot_write_d8(struct dpot_data * dpot,u8 val)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
dpot_write_r8d8(struct dpot_data * dpot,u8 reg,u16 val)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
dpot_write_r8d16(struct dpot_data * dpot,u8 reg,u16 val)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
dpot_read_spi(struct dpot_data * dpot,u8 reg)126 static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
127 {
128 unsigned int ctrl = 0;
129 int value;
130
131 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
132
133 if (dpot->feat & F_RDACS_WONLY)
134 return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
135 if (dpot->uid == DPOT_UID(AD5291_ID) ||
136 dpot->uid == DPOT_UID(AD5292_ID) ||
137 dpot->uid == DPOT_UID(AD5293_ID)) {
138
139 value = dpot_read_r8d8(dpot,
140 DPOT_AD5291_READ_RDAC << 2);
141
142 if (dpot->uid == DPOT_UID(AD5291_ID))
143 value = value >> 2;
144
145 return value;
146 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
147 dpot->uid == DPOT_UID(AD5271_ID)) {
148
149 value = dpot_read_r8d8(dpot,
150 DPOT_AD5270_1_2_4_READ_RDAC << 2);
151
152 if (value < 0)
153 return value;
154
155 if (dpot->uid == DPOT_UID(AD5271_ID))
156 value = value >> 2;
157
158 return value;
159 }
160
161 ctrl = DPOT_SPI_READ_RDAC;
162 } else if (reg & DPOT_ADDR_EEPROM) {
163 ctrl = DPOT_SPI_READ_EEPROM;
164 }
165
166 if (dpot->feat & F_SPI_16BIT)
167 return dpot_read_r8d8(dpot, ctrl);
168 else if (dpot->feat & F_SPI_24BIT)
169 return dpot_read_r8d16(dpot, ctrl);
170
171 return -EFAULT;
172 }
173
dpot_read_i2c(struct dpot_data * dpot,u8 reg)174 static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
175 {
176 int value;
177 unsigned int ctrl = 0;
178
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, DPOT_AD5270_1_2_4_RDAC << 2);
208 if (value < 0)
209 return value;
210 /*
211 * AD5272/AD5274 returns high byte first, however
212 * underling smbus expects low byte first.
213 */
214 value = swab16(value);
215
216 if (dpot->uid == DPOT_UID(AD5274_ID))
217 value = value >> 2;
218 return value;
219 default:
220 if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
221 return dpot_read_r8d16(dpot, (reg & 0xF8) |
222 ((reg & 0x7) << 1));
223 else
224 return dpot_read_r8d8(dpot, reg);
225 }
226 }
227
dpot_read(struct dpot_data * dpot,u8 reg)228 static s32 dpot_read(struct dpot_data *dpot, u8 reg)
229 {
230 if (dpot->feat & F_SPI)
231 return dpot_read_spi(dpot, reg);
232 else
233 return dpot_read_i2c(dpot, reg);
234 }
235
dpot_write_spi(struct dpot_data * dpot,u8 reg,u16 value)236 static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
237 {
238 unsigned int val = 0;
239
240 if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
241 if (dpot->feat & F_RDACS_WONLY)
242 dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
243
244 if (dpot->feat & F_AD_APPDATA) {
245 if (dpot->feat & F_SPI_8BIT) {
246 val = ((reg & DPOT_RDAC_MASK) <<
247 DPOT_MAX_POS(dpot->devid)) |
248 value;
249 return dpot_write_d8(dpot, val);
250 } else if (dpot->feat & F_SPI_16BIT) {
251 val = ((reg & DPOT_RDAC_MASK) <<
252 DPOT_MAX_POS(dpot->devid)) |
253 value;
254 return dpot_write_r8d8(dpot, val >> 8,
255 val & 0xFF);
256 } else
257 BUG();
258 } else {
259 if (dpot->uid == DPOT_UID(AD5291_ID) ||
260 dpot->uid == DPOT_UID(AD5292_ID) ||
261 dpot->uid == DPOT_UID(AD5293_ID)) {
262
263 dpot_write_r8d8(dpot, DPOT_AD5291_CTRLREG << 2,
264 DPOT_AD5291_UNLOCK_CMD);
265
266 if (dpot->uid == DPOT_UID(AD5291_ID))
267 value = value << 2;
268
269 return dpot_write_r8d8(dpot,
270 (DPOT_AD5291_RDAC << 2) |
271 (value >> 8), value & 0xFF);
272 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
273 dpot->uid == DPOT_UID(AD5271_ID)) {
274 dpot_write_r8d8(dpot,
275 DPOT_AD5270_1_2_4_CTRLREG << 2,
276 DPOT_AD5270_1_2_4_UNLOCK_CMD);
277
278 if (dpot->uid == DPOT_UID(AD5271_ID))
279 value = value << 2;
280
281 return dpot_write_r8d8(dpot,
282 (DPOT_AD5270_1_2_4_RDAC << 2) |
283 (value >> 8), value & 0xFF);
284 }
285 val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
286 }
287 } else if (reg & DPOT_ADDR_EEPROM) {
288 val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
289 } else if (reg & DPOT_ADDR_CMD) {
290 switch (reg) {
291 case DPOT_DEC_ALL_6DB:
292 val = DPOT_SPI_DEC_ALL_6DB;
293 break;
294 case DPOT_INC_ALL_6DB:
295 val = DPOT_SPI_INC_ALL_6DB;
296 break;
297 case DPOT_DEC_ALL:
298 val = DPOT_SPI_DEC_ALL;
299 break;
300 case DPOT_INC_ALL:
301 val = DPOT_SPI_INC_ALL;
302 break;
303 }
304 } else if (reg & DPOT_ADDR_OTP) {
305 if (dpot->uid == DPOT_UID(AD5291_ID) ||
306 dpot->uid == DPOT_UID(AD5292_ID)) {
307 return dpot_write_r8d8(dpot,
308 DPOT_AD5291_STORE_XTPM << 2, 0);
309 } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
310 dpot->uid == DPOT_UID(AD5271_ID)) {
311 return dpot_write_r8d8(dpot,
312 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
313 }
314 } else
315 BUG();
316
317 if (dpot->feat & F_SPI_16BIT)
318 return dpot_write_r8d8(dpot, val, value);
319 else if (dpot->feat & F_SPI_24BIT)
320 return dpot_write_r8d16(dpot, val, value);
321
322 return -EFAULT;
323 }
324
dpot_write_i2c(struct dpot_data * dpot,u8 reg,u16 value)325 static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
326 {
327 /* Only write the instruction byte for certain commands */
328 unsigned int tmp = 0, ctrl = 0;
329
330 switch (dpot->uid) {
331 case DPOT_UID(AD5246_ID):
332 case DPOT_UID(AD5247_ID):
333 return dpot_write_d8(dpot, value);
334
335 case DPOT_UID(AD5245_ID):
336 case DPOT_UID(AD5241_ID):
337 case DPOT_UID(AD5242_ID):
338 case DPOT_UID(AD5243_ID):
339 case DPOT_UID(AD5248_ID):
340 case DPOT_UID(AD5280_ID):
341 case DPOT_UID(AD5282_ID):
342 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
343 0 : DPOT_AD5282_RDAC_AB;
344 return dpot_write_r8d8(dpot, ctrl, value);
345 case DPOT_UID(AD5171_ID):
346 case DPOT_UID(AD5273_ID):
347 if (reg & DPOT_ADDR_OTP) {
348 tmp = dpot_read_d8(dpot);
349 if (tmp >> 6) /* Ready to Program? */
350 return -EFAULT;
351 ctrl = DPOT_AD5273_FUSE;
352 }
353 return dpot_write_r8d8(dpot, ctrl, value);
354 case DPOT_UID(AD5172_ID):
355 case DPOT_UID(AD5173_ID):
356 ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
357 0 : DPOT_AD5172_3_A0;
358 if (reg & DPOT_ADDR_OTP) {
359 tmp = dpot_read_r8d16(dpot, ctrl);
360 if (tmp >> 14) /* Ready to Program? */
361 return -EFAULT;
362 ctrl |= DPOT_AD5170_2_3_FUSE;
363 }
364 return dpot_write_r8d8(dpot, ctrl, value);
365 case DPOT_UID(AD5170_ID):
366 if (reg & DPOT_ADDR_OTP) {
367 tmp = dpot_read_r8d16(dpot, tmp);
368 if (tmp >> 14) /* Ready to Program? */
369 return -EFAULT;
370 ctrl = DPOT_AD5170_2_3_FUSE;
371 }
372 return dpot_write_r8d8(dpot, ctrl, value);
373 case DPOT_UID(AD5272_ID):
374 case DPOT_UID(AD5274_ID):
375 dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
376 DPOT_AD5270_1_2_4_UNLOCK_CMD);
377
378 if (reg & DPOT_ADDR_OTP)
379 return dpot_write_r8d8(dpot,
380 DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
381
382 if (dpot->uid == DPOT_UID(AD5274_ID))
383 value = value << 2;
384
385 return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
386 (value >> 8), value & 0xFF);
387 default:
388 if (reg & DPOT_ADDR_CMD)
389 return dpot_write_d8(dpot, reg);
390
391 if (dpot->max_pos > 256)
392 return dpot_write_r8d16(dpot, (reg & 0xF8) |
393 ((reg & 0x7) << 1), value);
394 else
395 /* All other registers require instruction + data bytes */
396 return dpot_write_r8d8(dpot, reg, value);
397 }
398 }
399
dpot_write(struct dpot_data * dpot,u8 reg,u16 value)400 static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
401 {
402 if (dpot->feat & F_SPI)
403 return dpot_write_spi(dpot, reg, value);
404 else
405 return dpot_write_i2c(dpot, reg, value);
406 }
407
408 /* sysfs functions */
409
sysfs_show_reg(struct device * dev,struct device_attribute * attr,char * buf,u32 reg)410 static ssize_t sysfs_show_reg(struct device *dev,
411 struct device_attribute *attr,
412 char *buf, u32 reg)
413 {
414 struct dpot_data *data = dev_get_drvdata(dev);
415 s32 value;
416
417 if (reg & DPOT_ADDR_OTP_EN)
418 return sprintf(buf, "%s\n",
419 test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
420 "enabled" : "disabled");
421
422
423 mutex_lock(&data->update_lock);
424 value = dpot_read(data, reg);
425 mutex_unlock(&data->update_lock);
426
427 if (value < 0)
428 return -EINVAL;
429 /*
430 * Let someone else deal with converting this ...
431 * the tolerance is a two-byte value where the MSB
432 * is a sign + integer value, and the LSB is a
433 * decimal value. See page 18 of the AD5258
434 * datasheet (Rev. A) for more details.
435 */
436
437 if (reg & DPOT_REG_TOL)
438 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
439 else
440 return sprintf(buf, "%u\n", value & data->rdac_mask);
441 }
442
sysfs_set_reg(struct device * dev,struct device_attribute * attr,const char * buf,size_t count,u32 reg)443 static ssize_t sysfs_set_reg(struct device *dev,
444 struct device_attribute *attr,
445 const char *buf, size_t count, u32 reg)
446 {
447 struct dpot_data *data = dev_get_drvdata(dev);
448 unsigned long value;
449 int err;
450
451 if (reg & DPOT_ADDR_OTP_EN) {
452 if (sysfs_streq(buf, "enabled"))
453 set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
454 else
455 clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
456
457 return count;
458 }
459
460 if ((reg & DPOT_ADDR_OTP) &&
461 !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
462 return -EPERM;
463
464 err = kstrtoul(buf, 10, &value);
465 if (err)
466 return err;
467
468 if (value > data->rdac_mask)
469 value = data->rdac_mask;
470
471 mutex_lock(&data->update_lock);
472 dpot_write(data, reg, value);
473 if (reg & DPOT_ADDR_EEPROM)
474 msleep(26); /* Sleep while the EEPROM updates */
475 else if (reg & DPOT_ADDR_OTP)
476 msleep(400); /* Sleep while the OTP updates */
477 mutex_unlock(&data->update_lock);
478
479 return count;
480 }
481
sysfs_do_cmd(struct device * dev,struct device_attribute * attr,const char * buf,size_t count,u32 reg)482 static ssize_t sysfs_do_cmd(struct device *dev,
483 struct device_attribute *attr,
484 const char *buf, size_t count, u32 reg)
485 {
486 struct dpot_data *data = dev_get_drvdata(dev);
487
488 mutex_lock(&data->update_lock);
489 dpot_write(data, reg, 0);
490 mutex_unlock(&data->update_lock);
491
492 return count;
493 }
494
495 /* ------------------------------------------------------------------------- */
496
497 #define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
498 show_##_name(struct device *dev, \
499 struct device_attribute *attr, char *buf) \
500 { \
501 return sysfs_show_reg(dev, attr, buf, _reg); \
502 }
503
504 #define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
505 set_##_name(struct device *dev, \
506 struct device_attribute *attr, \
507 const char *buf, size_t count) \
508 { \
509 return sysfs_set_reg(dev, attr, buf, count, _reg); \
510 }
511
512 #define DPOT_DEVICE_SHOW_SET(name, reg) \
513 DPOT_DEVICE_SHOW(name, reg) \
514 DPOT_DEVICE_SET(name, reg) \
515 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name)
516
517 #define DPOT_DEVICE_SHOW_ONLY(name, reg) \
518 DPOT_DEVICE_SHOW(name, reg) \
519 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL)
520
521 DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
522 DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
523 DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
524 DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
525 DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
526
527 DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
528 DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
529 DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
530 DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
531 DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
532
533 DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
534 DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
535 DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
536 DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
537 DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
538
539 DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
540 DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
541 DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
542 DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
543 DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
544
545 DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
546 DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
547 DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
548 DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
549 DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
550
551 DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
552 DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
553 DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
554 DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
555 DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
556
557 static const struct attribute *dpot_attrib_wipers[] = {
558 &dev_attr_rdac0.attr,
559 &dev_attr_rdac1.attr,
560 &dev_attr_rdac2.attr,
561 &dev_attr_rdac3.attr,
562 &dev_attr_rdac4.attr,
563 &dev_attr_rdac5.attr,
564 NULL
565 };
566
567 static const struct attribute *dpot_attrib_eeprom[] = {
568 &dev_attr_eeprom0.attr,
569 &dev_attr_eeprom1.attr,
570 &dev_attr_eeprom2.attr,
571 &dev_attr_eeprom3.attr,
572 &dev_attr_eeprom4.attr,
573 &dev_attr_eeprom5.attr,
574 NULL
575 };
576
577 static const struct attribute *dpot_attrib_otp[] = {
578 &dev_attr_otp0.attr,
579 &dev_attr_otp1.attr,
580 &dev_attr_otp2.attr,
581 &dev_attr_otp3.attr,
582 &dev_attr_otp4.attr,
583 &dev_attr_otp5.attr,
584 NULL
585 };
586
587 static const struct attribute *dpot_attrib_otp_en[] = {
588 &dev_attr_otp0en.attr,
589 &dev_attr_otp1en.attr,
590 &dev_attr_otp2en.attr,
591 &dev_attr_otp3en.attr,
592 &dev_attr_otp4en.attr,
593 &dev_attr_otp5en.attr,
594 NULL
595 };
596
597 static const struct attribute *dpot_attrib_tolerance[] = {
598 &dev_attr_tolerance0.attr,
599 &dev_attr_tolerance1.attr,
600 &dev_attr_tolerance2.attr,
601 &dev_attr_tolerance3.attr,
602 &dev_attr_tolerance4.attr,
603 &dev_attr_tolerance5.attr,
604 NULL
605 };
606
607 /* ------------------------------------------------------------------------- */
608
609 #define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
610 set_##_name(struct device *dev, \
611 struct device_attribute *attr, \
612 const char *buf, size_t count) \
613 { \
614 return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
615 } \
616 static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name)
617
618 DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
619 DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
620 DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
621 DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
622
623 static struct attribute *ad525x_attributes_commands[] = {
624 &dev_attr_inc_all.attr,
625 &dev_attr_dec_all.attr,
626 &dev_attr_inc_all_6db.attr,
627 &dev_attr_dec_all_6db.attr,
628 NULL
629 };
630
631 static const struct attribute_group ad525x_group_commands = {
632 .attrs = ad525x_attributes_commands,
633 };
634
ad_dpot_add_files(struct device * dev,unsigned int features,unsigned int rdac)635 static int ad_dpot_add_files(struct device *dev,
636 unsigned int features, unsigned int rdac)
637 {
638 int err = sysfs_create_file(&dev->kobj,
639 dpot_attrib_wipers[rdac]);
640 if (features & F_CMD_EEP)
641 err |= sysfs_create_file(&dev->kobj,
642 dpot_attrib_eeprom[rdac]);
643 if (features & F_CMD_TOL)
644 err |= sysfs_create_file(&dev->kobj,
645 dpot_attrib_tolerance[rdac]);
646 if (features & F_CMD_OTP) {
647 err |= sysfs_create_file(&dev->kobj,
648 dpot_attrib_otp_en[rdac]);
649 err |= sysfs_create_file(&dev->kobj,
650 dpot_attrib_otp[rdac]);
651 }
652
653 if (err)
654 dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
655 rdac);
656
657 return err;
658 }
659
ad_dpot_remove_files(struct device * dev,unsigned int features,unsigned int rdac)660 static inline void ad_dpot_remove_files(struct device *dev,
661 unsigned int features, unsigned int rdac)
662 {
663 sysfs_remove_file(&dev->kobj,
664 dpot_attrib_wipers[rdac]);
665 if (features & F_CMD_EEP)
666 sysfs_remove_file(&dev->kobj,
667 dpot_attrib_eeprom[rdac]);
668 if (features & F_CMD_TOL)
669 sysfs_remove_file(&dev->kobj,
670 dpot_attrib_tolerance[rdac]);
671 if (features & F_CMD_OTP) {
672 sysfs_remove_file(&dev->kobj,
673 dpot_attrib_otp_en[rdac]);
674 sysfs_remove_file(&dev->kobj,
675 dpot_attrib_otp[rdac]);
676 }
677 }
678
ad_dpot_probe(struct device * dev,struct ad_dpot_bus_data * bdata,unsigned long devid,const char * name)679 int ad_dpot_probe(struct device *dev,
680 struct ad_dpot_bus_data *bdata, unsigned long devid,
681 const char *name)
682 {
683
684 struct dpot_data *data;
685 int i, err = 0;
686
687 data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
688 if (!data) {
689 err = -ENOMEM;
690 goto exit;
691 }
692
693 dev_set_drvdata(dev, data);
694 mutex_init(&data->update_lock);
695
696 data->bdata = *bdata;
697 data->devid = devid;
698
699 data->max_pos = 1 << DPOT_MAX_POS(devid);
700 data->rdac_mask = data->max_pos - 1;
701 data->feat = DPOT_FEAT(devid);
702 data->uid = DPOT_UID(devid);
703 data->wipers = DPOT_WIPERS(devid);
704
705 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
706 if (data->wipers & (1 << i)) {
707 err = ad_dpot_add_files(dev, data->feat, i);
708 if (err)
709 goto exit_remove_files;
710 /* power-up midscale */
711 if (data->feat & F_RDACS_WONLY)
712 data->rdac_cache[i] = data->max_pos / 2;
713 }
714
715 if (data->feat & F_CMD_INC)
716 err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
717
718 if (err) {
719 dev_err(dev, "failed to register sysfs hooks\n");
720 goto exit_free;
721 }
722
723 dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
724 name, data->max_pos);
725
726 return 0;
727
728 exit_remove_files:
729 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
730 if (data->wipers & (1 << i))
731 ad_dpot_remove_files(dev, data->feat, i);
732
733 exit_free:
734 kfree(data);
735 dev_set_drvdata(dev, NULL);
736 exit:
737 dev_err(dev, "failed to create client for %s ID 0x%lX\n",
738 name, devid);
739 return err;
740 }
741 EXPORT_SYMBOL(ad_dpot_probe);
742
ad_dpot_remove(struct device * dev)743 int ad_dpot_remove(struct device *dev)
744 {
745 struct dpot_data *data = dev_get_drvdata(dev);
746 int i;
747
748 for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
749 if (data->wipers & (1 << i))
750 ad_dpot_remove_files(dev, data->feat, i);
751
752 kfree(data);
753
754 return 0;
755 }
756 EXPORT_SYMBOL(ad_dpot_remove);
757
758
759 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
760 "Michael Hennerich <michael.hennerich@analog.com>");
761 MODULE_DESCRIPTION("Digital potentiometer driver");
762 MODULE_LICENSE("GPL");
763
