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drm/radeon/kms/pm: resurrect printing power states
[linux-2.6/cjktty.git] / drivers / misc / ad525x_dpot.c
blob5e6fa8449e8b7bba11c2aca88fce59f34b80277e
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);
CJK support for tty framebuffer vt