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-rw-r--r--Documentation/misc-devices/ad525x_dpot.txt57
-rw-r--r--drivers/misc/Kconfig14
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/ad525x_dpot.c666
4 files changed, 738 insertions, 0 deletions
diff --git a/Documentation/misc-devices/ad525x_dpot.txt b/Documentation/misc-devices/ad525x_dpot.txt
new file mode 100644
index 000000000000..0c9413b1cbf3
--- /dev/null
+++ b/Documentation/misc-devices/ad525x_dpot.txt
@@ -0,0 +1,57 @@
1---------------------------------
2 AD525x Digital Potentiometers
3---------------------------------
4
5The ad525x_dpot driver exports a simple sysfs interface. This allows you to
6work with the immediate resistance settings as well as update the saved startup
7settings. Access to the factory programmed tolerance is also provided, but
8interpretation of this settings is required by the end application according to
9the specific part in use.
10
11---------
12 Files
13---------
14
15Each dpot device will have a set of eeprom, rdac, and tolerance files. How
16many depends on the actual part you have, as will the range of allowed values.
17
18The eeprom files are used to program the startup value of the device.
19
20The rdac files are used to program the immediate value of the device.
21
22The tolerance files are the read-only factory programmed tolerance settings
23and may vary greatly on a part-by-part basis. For exact interpretation of
24this field, please consult the datasheet for your part. This is presented
25as a hex file for easier parsing.
26
27-----------
28 Example
29-----------
30
31Locate the device in your sysfs tree. This is probably easiest by going into
32the common i2c directory and locating the device by the i2c slave address.
33
34 # ls /sys/bus/i2c/devices/
35 0-0022 0-0027 0-002f
36
37So assuming the device in question is on the first i2c bus and has the slave
38address of 0x2f, we descend (unrelated sysfs entries have been trimmed).
39
40 # ls /sys/bus/i2c/devices/0-002f/
41 eeprom0 rdac0 tolerance0
42
43You can use simple reads/writes to access these files:
44
45 # cd /sys/bus/i2c/devices/0-002f/
46
47 # cat eeprom0
48 0
49 # echo 10 > eeprom0
50 # cat eeprom0
51 10
52
53 # cat rdac0
54 5
55 # echo 3 > rdac0
56 # cat rdac0
57 3
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 2c16ca6501d5..0c7f4c5dd07f 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -13,6 +13,20 @@ menuconfig MISC_DEVICES
13 13
14if MISC_DEVICES 14if MISC_DEVICES
15 15
16config AD525X_DPOT
17 tristate "Analog Devices AD525x Digital Potentiometers"
18 depends on I2C && SYSFS
19 help
20 If you say yes here, you get support for the Analog Devices
21 AD5258, AD5259, AD5251, AD5252, AD5253, AD5254 and AD5255
22 digital potentiometer chips.
23
24 See Documentation/misc-devices/ad525x_dpot.txt for the
25 userspace interface.
26
27 This driver can also be built as a module. If so, the module
28 will be called ad525x_dpot.
29
16config ATMEL_PWM 30config ATMEL_PWM
17 tristate "Atmel AT32/AT91 PWM support" 31 tristate "Atmel AT32/AT91 PWM support"
18 depends on AVR32 || ARCH_AT91SAM9263 || ARCH_AT91SAM9RL || ARCH_AT91CAP9 32 depends on AVR32 || ARCH_AT91SAM9263 || ARCH_AT91SAM9RL || ARCH_AT91CAP9
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 906a0edcea40..18c8418a5132 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -4,6 +4,7 @@
4 4
5obj-$(CONFIG_IBM_ASM) += ibmasm/ 5obj-$(CONFIG_IBM_ASM) += ibmasm/
6obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/ 6obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/
7obj-$(CONFIG_AD525X_DPOT) += ad525x_dpot.o
7obj-$(CONFIG_ATMEL_PWM) += atmel_pwm.o 8obj-$(CONFIG_ATMEL_PWM) += atmel_pwm.o
8obj-$(CONFIG_ATMEL_SSC) += atmel-ssc.o 9obj-$(CONFIG_ATMEL_SSC) += atmel-ssc.o
9obj-$(CONFIG_ATMEL_TCLIB) += atmel_tclib.o 10obj-$(CONFIG_ATMEL_TCLIB) += atmel_tclib.o
diff --git a/drivers/misc/ad525x_dpot.c b/drivers/misc/ad525x_dpot.c
new file mode 100644
index 000000000000..30a59f2bacd2
--- /dev/null
+++ b/drivers/misc/ad525x_dpot.c
@@ -0,0 +1,666 @@
1/*
2 * ad525x_dpot: Driver for the Analog Devices AD525x digital potentiometers
3 * Copyright (c) 2009 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 *
15 * See Documentation/misc-devices/ad525x_dpot.txt for more info.
16 *
17 * derived from ad5258.c
18 * Copyright (c) 2009 Cyber Switching, Inc.
19 * Author: Chris Verges <chrisv@cyberswitching.com>
20 *
21 * derived from ad5252.c
22 * Copyright (c) 2006 Michael Hennerich <hennerich@blackfin.uclinux.org>
23 *
24 * Licensed under the GPL-2 or later.
25 */
26
27#include <linux/module.h>
28#include <linux/device.h>
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/slab.h>
32#include <linux/i2c.h>
33#include <linux/delay.h>
34
35#define DRIVER_NAME "ad525x_dpot"
36#define DRIVER_VERSION "0.1"
37
38enum dpot_devid {
39 AD5258_ID,
40 AD5259_ID,
41 AD5251_ID,
42 AD5252_ID,
43 AD5253_ID,
44 AD5254_ID,
45 AD5255_ID,
46};
47
48#define AD5258_MAX_POSITION 64
49#define AD5259_MAX_POSITION 256
50#define AD5251_MAX_POSITION 64
51#define AD5252_MAX_POSITION 256
52#define AD5253_MAX_POSITION 64
53#define AD5254_MAX_POSITION 256
54#define AD5255_MAX_POSITION 512
55
56#define AD525X_RDAC0 0
57#define AD525X_RDAC1 1
58#define AD525X_RDAC2 2
59#define AD525X_RDAC3 3
60
61#define AD525X_REG_TOL 0x18
62#define AD525X_TOL_RDAC0 (AD525X_REG_TOL | AD525X_RDAC0)
63#define AD525X_TOL_RDAC1 (AD525X_REG_TOL | AD525X_RDAC1)
64#define AD525X_TOL_RDAC2 (AD525X_REG_TOL | AD525X_RDAC2)
65#define AD525X_TOL_RDAC3 (AD525X_REG_TOL | AD525X_RDAC3)
66
67/* RDAC-to-EEPROM Interface Commands */
68#define AD525X_I2C_RDAC (0x00 << 5)
69#define AD525X_I2C_EEPROM (0x01 << 5)
70#define AD525X_I2C_CMD (0x80)
71
72#define AD525X_DEC_ALL_6DB (AD525X_I2C_CMD | (0x4 << 3))
73#define AD525X_INC_ALL_6DB (AD525X_I2C_CMD | (0x9 << 3))
74#define AD525X_DEC_ALL (AD525X_I2C_CMD | (0x6 << 3))
75#define AD525X_INC_ALL (AD525X_I2C_CMD | (0xB << 3))
76
77static s32 ad525x_read(struct i2c_client *client, u8 reg);
78static s32 ad525x_write(struct i2c_client *client, u8 reg, u8 value);
79
80/*
81 * Client data (each client gets its own)
82 */
83
84struct dpot_data {
85 struct mutex update_lock;
86 unsigned rdac_mask;
87 unsigned max_pos;
88 unsigned devid;
89};
90
91/* sysfs functions */
92
93static ssize_t sysfs_show_reg(struct device *dev,
94 struct device_attribute *attr, char *buf, u32 reg)
95{
96 struct i2c_client *client = to_i2c_client(dev);
97 struct dpot_data *data = i2c_get_clientdata(client);
98 s32 value;
99
100 mutex_lock(&data->update_lock);
101 value = ad525x_read(client, reg);
102 mutex_unlock(&data->update_lock);
103
104 if (value < 0)
105 return -EINVAL;
106 /*
107 * Let someone else deal with converting this ...
108 * the tolerance is a two-byte value where the MSB
109 * is a sign + integer value, and the LSB is a
110 * decimal value. See page 18 of the AD5258
111 * datasheet (Rev. A) for more details.
112 */
113
114 if (reg & AD525X_REG_TOL)
115 return sprintf(buf, "0x%04x\n", value & 0xFFFF);
116 else
117 return sprintf(buf, "%u\n", value & data->rdac_mask);
118}
119
120static ssize_t sysfs_set_reg(struct device *dev,
121 struct device_attribute *attr,
122 const char *buf, size_t count, u32 reg)
123{
124 struct i2c_client *client = to_i2c_client(dev);
125 struct dpot_data *data = i2c_get_clientdata(client);
126 unsigned long value;
127 int err;
128
129 err = strict_strtoul(buf, 10, &value);
130 if (err)
131 return err;
132
133 if (value > data->rdac_mask)
134 value = data->rdac_mask;
135
136 mutex_lock(&data->update_lock);
137 ad525x_write(client, reg, value);
138 if (reg & AD525X_I2C_EEPROM)
139 msleep(26); /* Sleep while the EEPROM updates */
140 mutex_unlock(&data->update_lock);
141
142 return count;
143}
144
145static ssize_t sysfs_do_cmd(struct device *dev,
146 struct device_attribute *attr,
147 const char *buf, size_t count, u32 reg)
148{
149 struct i2c_client *client = to_i2c_client(dev);
150 struct dpot_data *data = i2c_get_clientdata(client);
151
152 mutex_lock(&data->update_lock);
153 ad525x_write(client, reg, 0);
154 mutex_unlock(&data->update_lock);
155
156 return count;
157}
158
159/* ------------------------------------------------------------------------- */
160
161static ssize_t show_rdac0(struct device *dev,
162 struct device_attribute *attr, char *buf)
163{
164 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC0);
165}
166
167static ssize_t set_rdac0(struct device *dev,
168 struct device_attribute *attr,
169 const char *buf, size_t count)
170{
171 return sysfs_set_reg(dev, attr, buf, count,
172 AD525X_I2C_RDAC | AD525X_RDAC0);
173}
174
175static DEVICE_ATTR(rdac0, S_IWUSR | S_IRUGO, show_rdac0, set_rdac0);
176
177static ssize_t show_eeprom0(struct device *dev,
178 struct device_attribute *attr, char *buf)
179{
180 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC0);
181}
182
183static ssize_t set_eeprom0(struct device *dev,
184 struct device_attribute *attr,
185 const char *buf, size_t count)
186{
187 return sysfs_set_reg(dev, attr, buf, count,
188 AD525X_I2C_EEPROM | AD525X_RDAC0);
189}
190
191static DEVICE_ATTR(eeprom0, S_IWUSR | S_IRUGO, show_eeprom0, set_eeprom0);
192
193static ssize_t show_tolerance0(struct device *dev,
194 struct device_attribute *attr, char *buf)
195{
196 return sysfs_show_reg(dev, attr, buf,
197 AD525X_I2C_EEPROM | AD525X_TOL_RDAC0);
198}
199
200static DEVICE_ATTR(tolerance0, S_IRUGO, show_tolerance0, NULL);
201
202/* ------------------------------------------------------------------------- */
203
204static ssize_t show_rdac1(struct device *dev,
205 struct device_attribute *attr, char *buf)
206{
207 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC1);
208}
209
210static ssize_t set_rdac1(struct device *dev,
211 struct device_attribute *attr,
212 const char *buf, size_t count)
213{
214 return sysfs_set_reg(dev, attr, buf, count,
215 AD525X_I2C_RDAC | AD525X_RDAC1);
216}
217
218static DEVICE_ATTR(rdac1, S_IWUSR | S_IRUGO, show_rdac1, set_rdac1);
219
220static ssize_t show_eeprom1(struct device *dev,
221 struct device_attribute *attr, char *buf)
222{
223 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC1);
224}
225
226static ssize_t set_eeprom1(struct device *dev,
227 struct device_attribute *attr,
228 const char *buf, size_t count)
229{
230 return sysfs_set_reg(dev, attr, buf, count,
231 AD525X_I2C_EEPROM | AD525X_RDAC1);
232}
233
234static DEVICE_ATTR(eeprom1, S_IWUSR | S_IRUGO, show_eeprom1, set_eeprom1);
235
236static ssize_t show_tolerance1(struct device *dev,
237 struct device_attribute *attr, char *buf)
238{
239 return sysfs_show_reg(dev, attr, buf,
240 AD525X_I2C_EEPROM | AD525X_TOL_RDAC1);
241}
242
243static DEVICE_ATTR(tolerance1, S_IRUGO, show_tolerance1, NULL);
244
245/* ------------------------------------------------------------------------- */
246
247static ssize_t show_rdac2(struct device *dev,
248 struct device_attribute *attr, char *buf)
249{
250 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC2);
251}
252
253static ssize_t set_rdac2(struct device *dev,
254 struct device_attribute *attr,
255 const char *buf, size_t count)
256{
257 return sysfs_set_reg(dev, attr, buf, count,
258 AD525X_I2C_RDAC | AD525X_RDAC2);
259}
260
261static DEVICE_ATTR(rdac2, S_IWUSR | S_IRUGO, show_rdac2, set_rdac2);
262
263static ssize_t show_eeprom2(struct device *dev,
264 struct device_attribute *attr, char *buf)
265{
266 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC2);
267}
268
269static ssize_t set_eeprom2(struct device *dev,
270 struct device_attribute *attr,
271 const char *buf, size_t count)
272{
273 return sysfs_set_reg(dev, attr, buf, count,
274 AD525X_I2C_EEPROM | AD525X_RDAC2);
275}
276
277static DEVICE_ATTR(eeprom2, S_IWUSR | S_IRUGO, show_eeprom2, set_eeprom2);
278
279static ssize_t show_tolerance2(struct device *dev,
280 struct device_attribute *attr, char *buf)
281{
282 return sysfs_show_reg(dev, attr, buf,
283 AD525X_I2C_EEPROM | AD525X_TOL_RDAC2);
284}
285
286static DEVICE_ATTR(tolerance2, S_IRUGO, show_tolerance2, NULL);
287
288/* ------------------------------------------------------------------------- */
289
290static ssize_t show_rdac3(struct device *dev,
291 struct device_attribute *attr, char *buf)
292{
293 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC3);
294}
295
296static ssize_t set_rdac3(struct device *dev,
297 struct device_attribute *attr,
298 const char *buf, size_t count)
299{
300 return sysfs_set_reg(dev, attr, buf, count,
301 AD525X_I2C_RDAC | AD525X_RDAC3);
302}
303
304static DEVICE_ATTR(rdac3, S_IWUSR | S_IRUGO, show_rdac3, set_rdac3);
305
306static ssize_t show_eeprom3(struct device *dev,
307 struct device_attribute *attr, char *buf)
308{
309 return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC3);
310}
311
312static ssize_t set_eeprom3(struct device *dev,
313 struct device_attribute *attr,
314 const char *buf, size_t count)
315{
316 return sysfs_set_reg(dev, attr, buf, count,
317 AD525X_I2C_EEPROM | AD525X_RDAC3);
318}
319
320static DEVICE_ATTR(eeprom3, S_IWUSR | S_IRUGO, show_eeprom3, set_eeprom3);
321
322static ssize_t show_tolerance3(struct device *dev,
323 struct device_attribute *attr, char *buf)
324{
325 return sysfs_show_reg(dev, attr, buf,
326 AD525X_I2C_EEPROM | AD525X_TOL_RDAC3);
327}
328
329static DEVICE_ATTR(tolerance3, S_IRUGO, show_tolerance3, NULL);
330
331static struct attribute *ad525x_attributes_wipers[4][4] = {
332 {
333 &dev_attr_rdac0.attr,
334 &dev_attr_eeprom0.attr,
335 &dev_attr_tolerance0.attr,
336 NULL
337 }, {
338 &dev_attr_rdac1.attr,
339 &dev_attr_eeprom1.attr,
340 &dev_attr_tolerance1.attr,
341 NULL
342 }, {
343 &dev_attr_rdac2.attr,
344 &dev_attr_eeprom2.attr,
345 &dev_attr_tolerance2.attr,
346 NULL
347 }, {
348 &dev_attr_rdac3.attr,
349 &dev_attr_eeprom3.attr,
350 &dev_attr_tolerance3.attr,
351 NULL
352 }
353};
354
355static const struct attribute_group ad525x_group_wipers[] = {
356 {.attrs = ad525x_attributes_wipers[AD525X_RDAC0]},
357 {.attrs = ad525x_attributes_wipers[AD525X_RDAC1]},
358 {.attrs = ad525x_attributes_wipers[AD525X_RDAC2]},
359 {.attrs = ad525x_attributes_wipers[AD525X_RDAC3]},
360};
361
362/* ------------------------------------------------------------------------- */
363
364static ssize_t set_inc_all(struct device *dev,
365 struct device_attribute *attr,
366 const char *buf, size_t count)
367{
368 return sysfs_do_cmd(dev, attr, buf, count, AD525X_INC_ALL);
369}
370
371static DEVICE_ATTR(inc_all, S_IWUSR, NULL, set_inc_all);
372
373static ssize_t set_dec_all(struct device *dev,
374 struct device_attribute *attr,
375 const char *buf, size_t count)
376{
377 return sysfs_do_cmd(dev, attr, buf, count, AD525X_DEC_ALL);
378}
379
380static DEVICE_ATTR(dec_all, S_IWUSR, NULL, set_dec_all);
381
382static ssize_t set_inc_all_6db(struct device *dev,
383 struct device_attribute *attr,
384 const char *buf, size_t count)
385{
386 return sysfs_do_cmd(dev, attr, buf, count, AD525X_INC_ALL_6DB);
387}
388
389static DEVICE_ATTR(inc_all_6db, S_IWUSR, NULL, set_inc_all_6db);
390
391static ssize_t set_dec_all_6db(struct device *dev,
392 struct device_attribute *attr,
393 const char *buf, size_t count)
394{
395 return sysfs_do_cmd(dev, attr, buf, count, AD525X_DEC_ALL_6DB);
396}
397
398static DEVICE_ATTR(dec_all_6db, S_IWUSR, NULL, set_dec_all_6db);
399
400static struct attribute *ad525x_attributes_commands[] = {
401 &dev_attr_inc_all.attr,
402 &dev_attr_dec_all.attr,
403 &dev_attr_inc_all_6db.attr,
404 &dev_attr_dec_all_6db.attr,
405 NULL
406};
407
408static const struct attribute_group ad525x_group_commands = {
409 .attrs = ad525x_attributes_commands,
410};
411
412/* ------------------------------------------------------------------------- */
413
414/* i2c device functions */
415
416/**
417 * ad525x_read - return the value contained in the specified register
418 * on the AD5258 device.
419 * @client: value returned from i2c_new_device()
420 * @reg: the register to read
421 *
422 * If the tolerance register is specified, 2 bytes are returned.
423 * Otherwise, 1 byte is returned. A negative value indicates an error
424 * occurred while reading the register.
425 */
426static s32 ad525x_read(struct i2c_client *client, u8 reg)
427{
428 struct dpot_data *data = i2c_get_clientdata(client);
429
430 if ((reg & AD525X_REG_TOL) || (data->max_pos > 256))
431 return i2c_smbus_read_word_data(client, (reg & 0xF8) |
432 ((reg & 0x7) << 1));
433 else
434 return i2c_smbus_read_byte_data(client, reg);
435}
436
437/**
438 * ad525x_write - store the given value in the specified register on
439 * the AD5258 device.
440 * @client: value returned from i2c_new_device()
441 * @reg: the register to write
442 * @value: the byte to store in the register
443 *
444 * For certain instructions that do not require a data byte, "NULL"
445 * should be specified for the "value" parameter. These instructions
446 * include NOP, RESTORE_FROM_EEPROM, and STORE_TO_EEPROM.
447 *
448 * A negative return value indicates an error occurred while reading
449 * the register.
450 */
451static s32 ad525x_write(struct i2c_client *client, u8 reg, u8 value)
452{
453 struct dpot_data *data = i2c_get_clientdata(client);
454
455 /* Only write the instruction byte for certain commands */
456 if (reg & AD525X_I2C_CMD)
457 return i2c_smbus_write_byte(client, reg);
458
459 if (data->max_pos > 256)
460 return i2c_smbus_write_word_data(client, (reg & 0xF8) |
461 ((reg & 0x7) << 1), value);
462 else
463 /* All other registers require instruction + data bytes */
464 return i2c_smbus_write_byte_data(client, reg, value);
465}
466
467static int ad525x_probe(struct i2c_client *client,
468 const struct i2c_device_id *id)
469{
470 struct device *dev = &client->dev;
471 struct dpot_data *data;
472 int err = 0;
473
474 dev_dbg(dev, "%s\n", __func__);
475
476 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
477 dev_err(dev, "missing I2C functionality for this driver\n");
478 goto exit;
479 }
480
481 data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
482 if (!data) {
483 err = -ENOMEM;
484 goto exit;
485 }
486
487 i2c_set_clientdata(client, data);
488 mutex_init(&data->update_lock);
489
490 switch (id->driver_data) {
491 case AD5258_ID:
492 data->max_pos = AD5258_MAX_POSITION;
493 err = sysfs_create_group(&dev->kobj,
494 &ad525x_group_wipers[AD525X_RDAC0]);
495 break;
496 case AD5259_ID:
497 data->max_pos = AD5259_MAX_POSITION;
498 err = sysfs_create_group(&dev->kobj,
499 &ad525x_group_wipers[AD525X_RDAC0]);
500 break;
501 case AD5251_ID:
502 data->max_pos = AD5251_MAX_POSITION;
503 err = sysfs_create_group(&dev->kobj,
504 &ad525x_group_wipers[AD525X_RDAC1]);
505 err |= sysfs_create_group(&dev->kobj,
506 &ad525x_group_wipers[AD525X_RDAC3]);
507 err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
508 break;
509 case AD5252_ID:
510 data->max_pos = AD5252_MAX_POSITION;
511 err = sysfs_create_group(&dev->kobj,
512 &ad525x_group_wipers[AD525X_RDAC1]);
513 err |= sysfs_create_group(&dev->kobj,
514 &ad525x_group_wipers[AD525X_RDAC3]);
515 err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
516 break;
517 case AD5253_ID:
518 data->max_pos = AD5253_MAX_POSITION;
519 err = sysfs_create_group(&dev->kobj,
520 &ad525x_group_wipers[AD525X_RDAC0]);
521 err |= sysfs_create_group(&dev->kobj,
522 &ad525x_group_wipers[AD525X_RDAC1]);
523 err |= sysfs_create_group(&dev->kobj,
524 &ad525x_group_wipers[AD525X_RDAC2]);
525 err |= sysfs_create_group(&dev->kobj,
526 &ad525x_group_wipers[AD525X_RDAC3]);
527 err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
528 break;
529 case AD5254_ID:
530 data->max_pos = AD5254_MAX_POSITION;
531 err = sysfs_create_group(&dev->kobj,
532 &ad525x_group_wipers[AD525X_RDAC0]);
533 err |= sysfs_create_group(&dev->kobj,
534 &ad525x_group_wipers[AD525X_RDAC1]);
535 err |= sysfs_create_group(&dev->kobj,
536 &ad525x_group_wipers[AD525X_RDAC2]);
537 err |= sysfs_create_group(&dev->kobj,
538 &ad525x_group_wipers[AD525X_RDAC3]);
539 err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
540 break;
541 case AD5255_ID:
542 data->max_pos = AD5255_MAX_POSITION;
543 err = sysfs_create_group(&dev->kobj,
544 &ad525x_group_wipers[AD525X_RDAC0]);
545 err |= sysfs_create_group(&dev->kobj,
546 &ad525x_group_wipers[AD525X_RDAC1]);
547 err |= sysfs_create_group(&dev->kobj,
548 &ad525x_group_wipers[AD525X_RDAC2]);
549 err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
550 break;
551 default:
552 err = -ENODEV;
553 goto exit_free;
554 }
555
556 if (err) {
557 dev_err(dev, "failed to register sysfs hooks\n");
558 goto exit_free;
559 }
560
561 data->devid = id->driver_data;
562 data->rdac_mask = data->max_pos - 1;
563
564 dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
565 id->name, data->max_pos);
566
567 return 0;
568
569exit_free:
570 kfree(data);
571 i2c_set_clientdata(client, NULL);
572exit:
573 dev_err(dev, "failed to create client\n");
574 return err;
575}
576
577static int __devexit ad525x_remove(struct i2c_client *client)
578{
579 struct dpot_data *data = i2c_get_clientdata(client);
580 struct device *dev = &client->dev;
581
582 switch (data->devid) {
583 case AD5258_ID:
584 case AD5259_ID:
585 sysfs_remove_group(&dev->kobj,
586 &ad525x_group_wipers[AD525X_RDAC0]);
587 break;
588 case AD5251_ID:
589 case AD5252_ID:
590 sysfs_remove_group(&dev->kobj,
591 &ad525x_group_wipers[AD525X_RDAC1]);
592 sysfs_remove_group(&dev->kobj,
593 &ad525x_group_wipers[AD525X_RDAC3]);
594 sysfs_remove_group(&dev->kobj, &ad525x_group_commands);
595 break;
596 case AD5253_ID:
597 case AD5254_ID:
598 sysfs_remove_group(&dev->kobj,
599 &ad525x_group_wipers[AD525X_RDAC0]);
600 sysfs_remove_group(&dev->kobj,
601 &ad525x_group_wipers[AD525X_RDAC1]);
602 sysfs_remove_group(&dev->kobj,
603 &ad525x_group_wipers[AD525X_RDAC2]);
604 sysfs_remove_group(&dev->kobj,
605 &ad525x_group_wipers[AD525X_RDAC3]);
606 sysfs_remove_group(&dev->kobj, &ad525x_group_commands);
607 break;
608 case AD5255_ID:
609 sysfs_remove_group(&dev->kobj,
610 &ad525x_group_wipers[AD525X_RDAC0]);
611 sysfs_remove_group(&dev->kobj,
612 &ad525x_group_wipers[AD525X_RDAC1]);
613 sysfs_remove_group(&dev->kobj,
614 &ad525x_group_wipers[AD525X_RDAC2]);
615 sysfs_remove_group(&dev->kobj, &ad525x_group_commands);
616 break;
617 }
618
619 i2c_set_clientdata(client, NULL);
620 kfree(data);
621
622 return 0;
623}
624
625static const struct i2c_device_id ad525x_idtable[] = {
626 {"ad5258", AD5258_ID},
627 {"ad5259", AD5259_ID},
628 {"ad5251", AD5251_ID},
629 {"ad5252", AD5252_ID},
630 {"ad5253", AD5253_ID},
631 {"ad5254", AD5254_ID},
632 {"ad5255", AD5255_ID},
633 {}
634};
635
636MODULE_DEVICE_TABLE(i2c, ad525x_idtable);
637
638static struct i2c_driver ad525x_driver = {
639 .driver = {
640 .owner = THIS_MODULE,
641 .name = DRIVER_NAME,
642 },
643 .id_table = ad525x_idtable,
644 .probe = ad525x_probe,
645 .remove = __devexit_p(ad525x_remove),
646};
647
648static int __init ad525x_init(void)
649{
650 return i2c_add_driver(&ad525x_driver);
651}
652
653module_init(ad525x_init);
654
655static void __exit ad525x_exit(void)
656{
657 i2c_del_driver(&ad525x_driver);
658}
659
660module_exit(ad525x_exit);
661
662MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
663 "Michael Hennerich <hennerich@blackfin.uclinux.org>, ");
664MODULE_DESCRIPTION("AD5258/9 digital potentiometer driver");
665MODULE_LICENSE("GPL");
666MODULE_VERSION(DRIVER_VERSION);
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-01 13:04:57 -0400