blob: 8848f16c547b07a44e2de1f1834283b8f88e8fb5 [file] [log] [blame]
Jonathan Cameron847ec802009-08-18 18:06:19 +01001/* The industrial I/O core
2 *
3 * Copyright (c) 2008 Jonathan Cameron
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
8 *
9 * Based on elements of hwmon and input subsystems.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/idr.h>
15#include <linux/kdev_t.h>
16#include <linux/err.h>
17#include <linux/device.h>
18#include <linux/fs.h>
Jonathan Cameron847ec802009-08-18 18:06:19 +010019#include <linux/poll.h>
Jonathan Cameronffc18af2009-10-12 19:18:09 +010020#include <linux/sched.h>
Jeff Mahoney4439c932009-10-12 17:10:34 -040021#include <linux/wait.h>
Jonathan Cameron847ec802009-08-18 18:06:19 +010022#include <linux/cdev.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Jonathan Cameron8e7d9672011-08-30 12:32:45 +010024#include <linux/anon_inodes.h>
Michael Henneriche553f182012-03-01 10:51:03 +010025#include <linux/debugfs.h>
Jonathan Cameron06458e22012-04-25 15:54:58 +010026#include <linux/iio/iio.h>
Jonathan Camerondf9c1c42011-08-12 17:56:03 +010027#include "iio_core.h"
Jonathan Cameron6aea1c32011-08-24 17:28:38 +010028#include "iio_core_trigger.h"
Jonathan Cameron06458e22012-04-25 15:54:58 +010029#include <linux/iio/sysfs.h>
30#include <linux/iio/events.h>
Jonathan Cameron9dd1cb32011-08-30 12:41:15 +010031
Peter Meerwald99698b42012-08-26 13:43:00 +010032/* IDA to assign each registered device a unique id */
Jonathan Cameronb156cf72010-09-04 17:54:43 +010033static DEFINE_IDA(iio_ida);
Jonathan Cameron847ec802009-08-18 18:06:19 +010034
Jonathan Cameronf625cb92011-08-30 12:32:48 +010035static dev_t iio_devt;
Jonathan Cameron847ec802009-08-18 18:06:19 +010036
37#define IIO_DEV_MAX 256
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +010038struct bus_type iio_bus_type = {
Jonathan Cameron847ec802009-08-18 18:06:19 +010039 .name = "iio",
Jonathan Cameron847ec802009-08-18 18:06:19 +010040};
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +010041EXPORT_SYMBOL(iio_bus_type);
Jonathan Cameron847ec802009-08-18 18:06:19 +010042
Michael Henneriche553f182012-03-01 10:51:03 +010043static struct dentry *iio_debugfs_dentry;
44
Jonathan Cameronc6fc8062011-09-02 17:14:34 +010045static const char * const iio_direction[] = {
46 [0] = "in",
47 [1] = "out",
48};
49
Jonathan Cameronade7ef72011-09-02 17:14:45 +010050static const char * const iio_chan_type_name_spec[] = {
Jonathan Cameronc6fc8062011-09-02 17:14:34 +010051 [IIO_VOLTAGE] = "voltage",
Michael Hennerichfaf290e2011-05-18 14:42:02 +010052 [IIO_CURRENT] = "current",
53 [IIO_POWER] = "power",
Bryan Freed9bff02f2011-07-07 12:01:54 -070054 [IIO_ACCEL] = "accel",
Jonathan Cameron41ea0402011-10-05 15:27:59 +010055 [IIO_ANGL_VEL] = "anglvel",
Jonathan Cameron1d892712011-05-18 14:40:51 +010056 [IIO_MAGN] = "magn",
Bryan Freed9bff02f2011-07-07 12:01:54 -070057 [IIO_LIGHT] = "illuminance",
58 [IIO_INTENSITY] = "intensity",
Bryan Freedf09f2c82011-07-07 12:01:55 -070059 [IIO_PROXIMITY] = "proximity",
Bryan Freed9bff02f2011-07-07 12:01:54 -070060 [IIO_TEMP] = "temp",
Jonathan Cameron1d892712011-05-18 14:40:51 +010061 [IIO_INCLI] = "incli",
62 [IIO_ROT] = "rot",
Jonathan Cameron1d892712011-05-18 14:40:51 +010063 [IIO_ANGL] = "angl",
Bryan Freed9bff02f2011-07-07 12:01:54 -070064 [IIO_TIMESTAMP] = "timestamp",
Jonathan Cameron66dbe702011-09-02 17:14:43 +010065 [IIO_CAPACITANCE] = "capacitance",
Michael Hennericha6b12852012-04-27 10:58:34 +020066 [IIO_ALTVOLTAGE] = "altvoltage",
Jon Brenner21cd1fa2012-05-16 10:46:42 -050067 [IIO_CCT] = "cct",
Lars-Peter Clausenc4f0c692012-11-20 13:36:00 +000068 [IIO_PRESSURE] = "pressure",
Jonathan Cameron1d892712011-05-18 14:40:51 +010069};
70
Jonathan Cameron330c6c52011-09-02 17:14:39 +010071static const char * const iio_modifier_names[] = {
Jonathan Cameron1d892712011-05-18 14:40:51 +010072 [IIO_MOD_X] = "x",
73 [IIO_MOD_Y] = "y",
74 [IIO_MOD_Z] = "z",
Jonathan Cameron8f5879b2012-05-05 10:39:22 +010075 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)",
Jonathan Cameroncf82cb82012-05-05 10:56:41 +010076 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2",
Jonathan Cameron330c6c52011-09-02 17:14:39 +010077 [IIO_MOD_LIGHT_BOTH] = "both",
78 [IIO_MOD_LIGHT_IR] = "ir",
Jon Brenner21cd1fa2012-05-16 10:46:42 -050079 [IIO_MOD_LIGHT_CLEAR] = "clear",
80 [IIO_MOD_LIGHT_RED] = "red",
81 [IIO_MOD_LIGHT_GREEN] = "green",
82 [IIO_MOD_LIGHT_BLUE] = "blue",
Jonathan Cameron1d892712011-05-18 14:40:51 +010083};
84
85/* relies on pairs of these shared then separate */
86static const char * const iio_chan_info_postfix[] = {
Jonathan Cameron75a973c2012-04-15 17:41:30 +010087 [IIO_CHAN_INFO_RAW] = "raw",
88 [IIO_CHAN_INFO_PROCESSED] = "input",
Jonathan Cameronc8a9f802011-10-26 17:41:36 +010089 [IIO_CHAN_INFO_SCALE] = "scale",
90 [IIO_CHAN_INFO_OFFSET] = "offset",
91 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
92 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias",
93 [IIO_CHAN_INFO_PEAK] = "peak_raw",
94 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale",
95 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw",
96 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw",
Jonathan Camerondf94aba2011-11-27 11:39:12 +000097 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY]
98 = "filter_low_pass_3db_frequency",
Laxman Dewangance85a1c2012-04-13 16:03:31 +053099 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency",
Michael Hennericha6b12852012-04-27 10:58:34 +0200100 [IIO_CHAN_INFO_FREQUENCY] = "frequency",
101 [IIO_CHAN_INFO_PHASE] = "phase",
Michael Hennerichb65d6212012-05-11 11:36:53 +0200102 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
srinivas pandruvada7c9ab032012-09-05 13:56:00 +0100103 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
Jonathan Cameron1d892712011-05-18 14:40:51 +0100104};
105
Jonathan Cameron5fb21c82011-12-05 21:37:10 +0000106const struct iio_chan_spec
107*iio_find_channel_from_si(struct iio_dev *indio_dev, int si)
108{
109 int i;
110
111 for (i = 0; i < indio_dev->num_channels; i++)
112 if (indio_dev->channels[i].scan_index == si)
113 return &indio_dev->channels[i];
114 return NULL;
115}
116
Jonathan Cameron847ec802009-08-18 18:06:19 +0100117/* This turns up an awful lot */
118ssize_t iio_read_const_attr(struct device *dev,
119 struct device_attribute *attr,
120 char *buf)
121{
122 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
123}
124EXPORT_SYMBOL(iio_read_const_attr);
125
Jonathan Cameron847ec802009-08-18 18:06:19 +0100126static int __init iio_init(void)
127{
128 int ret;
129
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100130 /* Register sysfs bus */
131 ret = bus_register(&iio_bus_type);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100132 if (ret < 0) {
133 printk(KERN_ERR
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100134 "%s could not register bus type\n",
Jonathan Cameron847ec802009-08-18 18:06:19 +0100135 __FILE__);
136 goto error_nothing;
137 }
138
Jonathan Cameron9aa1a162011-08-12 17:08:50 +0100139 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
140 if (ret < 0) {
141 printk(KERN_ERR "%s: failed to allocate char dev region\n",
142 __FILE__);
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100143 goto error_unregister_bus_type;
Jonathan Cameron9aa1a162011-08-12 17:08:50 +0100144 }
Jonathan Cameron847ec802009-08-18 18:06:19 +0100145
Michael Henneriche553f182012-03-01 10:51:03 +0100146 iio_debugfs_dentry = debugfs_create_dir("iio", NULL);
147
Jonathan Cameron847ec802009-08-18 18:06:19 +0100148 return 0;
149
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100150error_unregister_bus_type:
151 bus_unregister(&iio_bus_type);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100152error_nothing:
153 return ret;
154}
155
156static void __exit iio_exit(void)
157{
Jonathan Cameron9aa1a162011-08-12 17:08:50 +0100158 if (iio_devt)
159 unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100160 bus_unregister(&iio_bus_type);
Michael Henneriche553f182012-03-01 10:51:03 +0100161 debugfs_remove(iio_debugfs_dentry);
162}
163
164#if defined(CONFIG_DEBUG_FS)
Michael Henneriche553f182012-03-01 10:51:03 +0100165static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
166 size_t count, loff_t *ppos)
167{
168 struct iio_dev *indio_dev = file->private_data;
169 char buf[20];
170 unsigned val = 0;
171 ssize_t len;
172 int ret;
173
174 ret = indio_dev->info->debugfs_reg_access(indio_dev,
175 indio_dev->cached_reg_addr,
176 0, &val);
177 if (ret)
178 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
179
180 len = snprintf(buf, sizeof(buf), "0x%X\n", val);
181
182 return simple_read_from_buffer(userbuf, count, ppos, buf, len);
183}
184
185static ssize_t iio_debugfs_write_reg(struct file *file,
186 const char __user *userbuf, size_t count, loff_t *ppos)
187{
188 struct iio_dev *indio_dev = file->private_data;
189 unsigned reg, val;
190 char buf[80];
191 int ret;
192
193 count = min_t(size_t, count, (sizeof(buf)-1));
194 if (copy_from_user(buf, userbuf, count))
195 return -EFAULT;
196
197 buf[count] = 0;
198
199 ret = sscanf(buf, "%i %i", &reg, &val);
200
201 switch (ret) {
202 case 1:
203 indio_dev->cached_reg_addr = reg;
204 break;
205 case 2:
206 indio_dev->cached_reg_addr = reg;
207 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
208 val, NULL);
209 if (ret) {
210 dev_err(indio_dev->dev.parent, "%s: write failed\n",
211 __func__);
212 return ret;
213 }
214 break;
215 default:
216 return -EINVAL;
217 }
218
219 return count;
220}
221
222static const struct file_operations iio_debugfs_reg_fops = {
Axel Lin5a28c872012-05-03 09:50:51 +0800223 .open = simple_open,
Michael Henneriche553f182012-03-01 10:51:03 +0100224 .read = iio_debugfs_read_reg,
225 .write = iio_debugfs_write_reg,
226};
227
228static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
229{
230 debugfs_remove_recursive(indio_dev->debugfs_dentry);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100231}
232
Michael Henneriche553f182012-03-01 10:51:03 +0100233static int iio_device_register_debugfs(struct iio_dev *indio_dev)
234{
235 struct dentry *d;
236
237 if (indio_dev->info->debugfs_reg_access == NULL)
238 return 0;
239
Axel Linabd5a2f2012-05-03 22:56:58 +0800240 if (!iio_debugfs_dentry)
Michael Henneriche553f182012-03-01 10:51:03 +0100241 return 0;
242
243 indio_dev->debugfs_dentry =
244 debugfs_create_dir(dev_name(&indio_dev->dev),
245 iio_debugfs_dentry);
Michael Henneriche553f182012-03-01 10:51:03 +0100246 if (indio_dev->debugfs_dentry == NULL) {
247 dev_warn(indio_dev->dev.parent,
248 "Failed to create debugfs directory\n");
249 return -EFAULT;
250 }
251
252 d = debugfs_create_file("direct_reg_access", 0644,
253 indio_dev->debugfs_dentry,
254 indio_dev, &iio_debugfs_reg_fops);
255 if (!d) {
256 iio_device_unregister_debugfs(indio_dev);
257 return -ENOMEM;
258 }
259
260 return 0;
261}
262#else
263static int iio_device_register_debugfs(struct iio_dev *indio_dev)
264{
265 return 0;
266}
267
268static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
269{
270}
271#endif /* CONFIG_DEBUG_FS */
272
Lars-Peter Clausen4fee7e12012-03-06 20:43:45 +0100273static ssize_t iio_read_channel_ext_info(struct device *dev,
274 struct device_attribute *attr,
275 char *buf)
276{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200277 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen4fee7e12012-03-06 20:43:45 +0100278 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
279 const struct iio_chan_spec_ext_info *ext_info;
280
281 ext_info = &this_attr->c->ext_info[this_attr->address];
282
Michael Hennerichfc6d1132012-04-27 10:58:36 +0200283 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf);
Lars-Peter Clausen4fee7e12012-03-06 20:43:45 +0100284}
285
286static ssize_t iio_write_channel_ext_info(struct device *dev,
287 struct device_attribute *attr,
288 const char *buf,
289 size_t len)
290{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200291 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Lars-Peter Clausen4fee7e12012-03-06 20:43:45 +0100292 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
293 const struct iio_chan_spec_ext_info *ext_info;
294
295 ext_info = &this_attr->c->ext_info[this_attr->address];
296
Michael Hennerichfc6d1132012-04-27 10:58:36 +0200297 return ext_info->write(indio_dev, ext_info->private,
298 this_attr->c, buf, len);
Lars-Peter Clausen4fee7e12012-03-06 20:43:45 +0100299}
300
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200301ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
302 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
303{
304 const struct iio_enum *e = (const struct iio_enum *)priv;
305 unsigned int i;
306 size_t len = 0;
307
308 if (!e->num_items)
309 return 0;
310
311 for (i = 0; i < e->num_items; ++i)
Lars-Peter Clausen74dcd432012-06-05 18:24:12 +0200312 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]);
Lars-Peter Clausen5212cc82012-06-04 11:36:11 +0200313
314 /* replace last space with a newline */
315 buf[len - 1] = '\n';
316
317 return len;
318}
319EXPORT_SYMBOL_GPL(iio_enum_available_read);
320
321ssize_t iio_enum_read(struct iio_dev *indio_dev,
322 uintptr_t priv, const struct iio_chan_spec *chan, char *buf)
323{
324 const struct iio_enum *e = (const struct iio_enum *)priv;
325 int i;
326
327 if (!e->get)
328 return -EINVAL;
329
330 i = e->get(indio_dev, chan);
331 if (i < 0)
332 return i;
333 else if (i >= e->num_items)
334 return -EINVAL;
335
336 return sprintf(buf, "%s\n", e->items[i]);
337}
338EXPORT_SYMBOL_GPL(iio_enum_read);
339
340ssize_t iio_enum_write(struct iio_dev *indio_dev,
341 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
342 size_t len)
343{
344 const struct iio_enum *e = (const struct iio_enum *)priv;
345 unsigned int i;
346 int ret;
347
348 if (!e->set)
349 return -EINVAL;
350
351 for (i = 0; i < e->num_items; i++) {
352 if (sysfs_streq(buf, e->items[i]))
353 break;
354 }
355
356 if (i == e->num_items)
357 return -EINVAL;
358
359 ret = e->set(indio_dev, chan, i);
360 return ret ? ret : len;
361}
362EXPORT_SYMBOL_GPL(iio_enum_write);
363
Jonathan Cameron1d892712011-05-18 14:40:51 +0100364static ssize_t iio_read_channel_info(struct device *dev,
365 struct device_attribute *attr,
366 char *buf)
Jonathan Cameron847ec802009-08-18 18:06:19 +0100367{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200368 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100369 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Lars-Peter Clausen7985e7c2012-09-14 16:21:00 +0100370 unsigned long long tmp;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100371 int val, val2;
Michael Hennerich67eedba2012-05-11 11:36:52 +0200372 bool scale_db = false;
Jonathan Cameron6fe81352011-05-18 14:42:37 +0100373 int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
374 &val, &val2, this_attr->address);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100375
Jonathan Cameron1d892712011-05-18 14:40:51 +0100376 if (ret < 0)
377 return ret;
378
Michael Hennerich67eedba2012-05-11 11:36:52 +0200379 switch (ret) {
380 case IIO_VAL_INT:
Jonathan Cameron1d892712011-05-18 14:40:51 +0100381 return sprintf(buf, "%d\n", val);
Michael Hennerich67eedba2012-05-11 11:36:52 +0200382 case IIO_VAL_INT_PLUS_MICRO_DB:
383 scale_db = true;
384 case IIO_VAL_INT_PLUS_MICRO:
Jonathan Cameron1d892712011-05-18 14:40:51 +0100385 if (val2 < 0)
Michael Hennerich67eedba2012-05-11 11:36:52 +0200386 return sprintf(buf, "-%d.%06u%s\n", val, -val2,
387 scale_db ? " dB" : "");
Jonathan Cameron1d892712011-05-18 14:40:51 +0100388 else
Michael Hennerich67eedba2012-05-11 11:36:52 +0200389 return sprintf(buf, "%d.%06u%s\n", val, val2,
390 scale_db ? " dB" : "");
391 case IIO_VAL_INT_PLUS_NANO:
Michael Hennerich71646e22011-06-27 13:07:07 +0100392 if (val2 < 0)
393 return sprintf(buf, "-%d.%09u\n", val, -val2);
394 else
395 return sprintf(buf, "%d.%09u\n", val, val2);
Lars-Peter Clausen7985e7c2012-09-14 16:21:00 +0100396 case IIO_VAL_FRACTIONAL:
397 tmp = div_s64((s64)val * 1000000000LL, val2);
398 val2 = do_div(tmp, 1000000000LL);
399 val = tmp;
400 return sprintf(buf, "%d.%09u\n", val, val2);
Lars-Peter Clausen103d9fb2012-10-16 17:29:00 +0100401 case IIO_VAL_FRACTIONAL_LOG2:
402 tmp = (s64)val * 1000000000LL >> val2;
403 val2 = do_div(tmp, 1000000000LL);
404 val = tmp;
405 return sprintf(buf, "%d.%09u\n", val, val2);
Michael Hennerich67eedba2012-05-11 11:36:52 +0200406 default:
Jonathan Cameron1d892712011-05-18 14:40:51 +0100407 return 0;
Michael Hennerich67eedba2012-05-11 11:36:52 +0200408 }
Jonathan Cameron1d892712011-05-18 14:40:51 +0100409}
410
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000411/**
412 * iio_str_to_fixpoint() - Parse a fixed-point number from a string
413 * @str: The string to parse
414 * @fract_mult: Multiplier for the first decimal place, should be a power of 10
415 * @integer: The integer part of the number
416 * @fract: The fractional part of the number
417 *
418 * Returns 0 on success, or a negative error code if the string could not be
419 * parsed.
420 */
421int iio_str_to_fixpoint(const char *str, int fract_mult,
422 int *integer, int *fract)
423{
424 int i = 0, f = 0;
425 bool integer_part = true, negative = false;
426
427 if (str[0] == '-') {
428 negative = true;
429 str++;
430 } else if (str[0] == '+') {
431 str++;
432 }
433
434 while (*str) {
435 if ('0' <= *str && *str <= '9') {
436 if (integer_part) {
437 i = i * 10 + *str - '0';
438 } else {
439 f += fract_mult * (*str - '0');
440 fract_mult /= 10;
441 }
442 } else if (*str == '\n') {
443 if (*(str + 1) == '\0')
444 break;
445 else
446 return -EINVAL;
447 } else if (*str == '.' && integer_part) {
448 integer_part = false;
449 } else {
450 return -EINVAL;
451 }
452 str++;
453 }
454
455 if (negative) {
456 if (i)
457 i = -i;
458 else
459 f = -f;
460 }
461
462 *integer = i;
463 *fract = f;
464
465 return 0;
466}
467EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
468
Jonathan Cameron1d892712011-05-18 14:40:51 +0100469static ssize_t iio_write_channel_info(struct device *dev,
470 struct device_attribute *attr,
471 const char *buf,
472 size_t len)
473{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200474 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100475 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000476 int ret, fract_mult = 100000;
477 int integer, fract;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100478
479 /* Assumes decimal - precision based on number of digits */
Jonathan Cameron6fe81352011-05-18 14:42:37 +0100480 if (!indio_dev->info->write_raw)
Jonathan Cameron1d892712011-05-18 14:40:51 +0100481 return -EINVAL;
Michael Hennerich5c04af02011-06-27 13:07:10 +0100482
483 if (indio_dev->info->write_raw_get_fmt)
484 switch (indio_dev->info->write_raw_get_fmt(indio_dev,
485 this_attr->c, this_attr->address)) {
486 case IIO_VAL_INT_PLUS_MICRO:
487 fract_mult = 100000;
488 break;
489 case IIO_VAL_INT_PLUS_NANO:
490 fract_mult = 100000000;
491 break;
492 default:
493 return -EINVAL;
494 }
495
Lars-Peter Clausen6807d722012-11-20 13:36:00 +0000496 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
497 if (ret)
498 return ret;
Jonathan Cameron847ec802009-08-18 18:06:19 +0100499
Jonathan Cameron6fe81352011-05-18 14:42:37 +0100500 ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
Michael Hennerich5c04af02011-06-27 13:07:10 +0100501 integer, fract, this_attr->address);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100502 if (ret)
503 return ret;
504
505 return len;
506}
507
Jonathan Camerondf9c1c42011-08-12 17:56:03 +0100508static
Jonathan Cameron1d892712011-05-18 14:40:51 +0100509int __iio_device_attr_init(struct device_attribute *dev_attr,
510 const char *postfix,
511 struct iio_chan_spec const *chan,
512 ssize_t (*readfunc)(struct device *dev,
513 struct device_attribute *attr,
514 char *buf),
515 ssize_t (*writefunc)(struct device *dev,
516 struct device_attribute *attr,
517 const char *buf,
518 size_t len),
519 bool generic)
520{
521 int ret;
522 char *name_format, *full_postfix;
523 sysfs_attr_init(&dev_attr->attr);
Jonathan Cameronade7ef72011-09-02 17:14:45 +0100524
525 /* Build up postfix of <extend_name>_<modifier>_postfix */
Jonathan Cameron0403e0d2011-10-26 17:27:42 +0100526 if (chan->modified && !generic) {
Jonathan Cameronade7ef72011-09-02 17:14:45 +0100527 if (chan->extend_name)
528 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s",
529 iio_modifier_names[chan
530 ->channel2],
531 chan->extend_name,
532 postfix);
533 else
534 full_postfix = kasprintf(GFP_KERNEL, "%s_%s",
535 iio_modifier_names[chan
536 ->channel2],
537 postfix);
538 } else {
539 if (chan->extend_name == NULL)
540 full_postfix = kstrdup(postfix, GFP_KERNEL);
541 else
542 full_postfix = kasprintf(GFP_KERNEL,
543 "%s_%s",
544 chan->extend_name,
545 postfix);
546 }
547 if (full_postfix == NULL) {
548 ret = -ENOMEM;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100549 goto error_ret;
Jonathan Cameronade7ef72011-09-02 17:14:45 +0100550 }
Jonathan Cameron1d892712011-05-18 14:40:51 +0100551
Justin P. Mattock4abf6f82012-02-29 22:00:38 -0800552 if (chan->differential) { /* Differential can not have modifier */
Jonathan Cameronade7ef72011-09-02 17:14:45 +0100553 if (generic)
554 name_format
555 = kasprintf(GFP_KERNEL, "%s_%s-%s_%s",
556 iio_direction[chan->output],
557 iio_chan_type_name_spec[chan->type],
558 iio_chan_type_name_spec[chan->type],
559 full_postfix);
560 else if (chan->indexed)
561 name_format
562 = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s",
563 iio_direction[chan->output],
564 iio_chan_type_name_spec[chan->type],
565 chan->channel,
566 iio_chan_type_name_spec[chan->type],
567 chan->channel2,
568 full_postfix);
569 else {
570 WARN_ON("Differential channels must be indexed\n");
571 ret = -EINVAL;
572 goto error_free_full_postfix;
573 }
574 } else { /* Single ended */
575 if (generic)
576 name_format
577 = kasprintf(GFP_KERNEL, "%s_%s_%s",
578 iio_direction[chan->output],
579 iio_chan_type_name_spec[chan->type],
580 full_postfix);
581 else if (chan->indexed)
582 name_format
583 = kasprintf(GFP_KERNEL, "%s_%s%d_%s",
584 iio_direction[chan->output],
585 iio_chan_type_name_spec[chan->type],
586 chan->channel,
587 full_postfix);
588 else
589 name_format
590 = kasprintf(GFP_KERNEL, "%s_%s_%s",
591 iio_direction[chan->output],
592 iio_chan_type_name_spec[chan->type],
593 full_postfix);
594 }
Jonathan Cameron1d892712011-05-18 14:40:51 +0100595 if (name_format == NULL) {
596 ret = -ENOMEM;
597 goto error_free_full_postfix;
598 }
599 dev_attr->attr.name = kasprintf(GFP_KERNEL,
600 name_format,
601 chan->channel,
602 chan->channel2);
603 if (dev_attr->attr.name == NULL) {
604 ret = -ENOMEM;
605 goto error_free_name_format;
606 }
607
608 if (readfunc) {
609 dev_attr->attr.mode |= S_IRUGO;
610 dev_attr->show = readfunc;
611 }
612
613 if (writefunc) {
614 dev_attr->attr.mode |= S_IWUSR;
615 dev_attr->store = writefunc;
616 }
617 kfree(name_format);
618 kfree(full_postfix);
619
620 return 0;
621
622error_free_name_format:
623 kfree(name_format);
624error_free_full_postfix:
625 kfree(full_postfix);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100626error_ret:
627 return ret;
628}
629
Jonathan Camerondf9c1c42011-08-12 17:56:03 +0100630static void __iio_device_attr_deinit(struct device_attribute *dev_attr)
Jonathan Cameron1d892712011-05-18 14:40:51 +0100631{
632 kfree(dev_attr->attr.name);
633}
634
635int __iio_add_chan_devattr(const char *postfix,
Jonathan Cameron1d892712011-05-18 14:40:51 +0100636 struct iio_chan_spec const *chan,
637 ssize_t (*readfunc)(struct device *dev,
638 struct device_attribute *attr,
639 char *buf),
640 ssize_t (*writefunc)(struct device *dev,
641 struct device_attribute *attr,
642 const char *buf,
643 size_t len),
Jonathan Camerone614a542011-09-02 17:14:41 +0100644 u64 mask,
Jonathan Cameron1d892712011-05-18 14:40:51 +0100645 bool generic,
646 struct device *dev,
647 struct list_head *attr_list)
648{
649 int ret;
650 struct iio_dev_attr *iio_attr, *t;
651
652 iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
653 if (iio_attr == NULL) {
654 ret = -ENOMEM;
655 goto error_ret;
656 }
657 ret = __iio_device_attr_init(&iio_attr->dev_attr,
658 postfix, chan,
659 readfunc, writefunc, generic);
660 if (ret)
661 goto error_iio_dev_attr_free;
662 iio_attr->c = chan;
663 iio_attr->address = mask;
664 list_for_each_entry(t, attr_list, l)
665 if (strcmp(t->dev_attr.attr.name,
666 iio_attr->dev_attr.attr.name) == 0) {
667 if (!generic)
668 dev_err(dev, "tried to double register : %s\n",
669 t->dev_attr.attr.name);
670 ret = -EBUSY;
671 goto error_device_attr_deinit;
672 }
Jonathan Cameron1d892712011-05-18 14:40:51 +0100673 list_add(&iio_attr->l, attr_list);
674
675 return 0;
676
677error_device_attr_deinit:
678 __iio_device_attr_deinit(&iio_attr->dev_attr);
679error_iio_dev_attr_free:
680 kfree(iio_attr);
681error_ret:
682 return ret;
683}
684
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100685static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
Jonathan Cameron1d892712011-05-18 14:40:51 +0100686 struct iio_chan_spec const *chan)
687{
Jonathan Cameron5ccb3ad2012-04-15 17:41:16 +0100688 int ret, attrcount = 0;
Jonathan Cameron75a973c2012-04-15 17:41:30 +0100689 int i;
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +0100690 const struct iio_chan_spec_ext_info *ext_info;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100691
Jonathan Cameron1d892712011-05-18 14:40:51 +0100692 if (chan->channel < 0)
693 return 0;
Jonathan Cameron75a973c2012-04-15 17:41:30 +0100694 for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
Jonathan Cameron1d892712011-05-18 14:40:51 +0100695 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100696 chan,
Jonathan Cameron1d892712011-05-18 14:40:51 +0100697 &iio_read_channel_info,
698 &iio_write_channel_info,
Jonathan Cameronc8a9f802011-10-26 17:41:36 +0100699 i/2,
Jonathan Cameron1d892712011-05-18 14:40:51 +0100700 !(i%2),
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100701 &indio_dev->dev,
702 &indio_dev->channel_attr_list);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100703 if (ret == -EBUSY && (i%2 == 0)) {
704 ret = 0;
705 continue;
706 }
707 if (ret < 0)
708 goto error_ret;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100709 attrcount++;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100710 }
Lars-Peter Clausen5f420b42012-02-21 18:38:12 +0100711
712 if (chan->ext_info) {
713 unsigned int i = 0;
714 for (ext_info = chan->ext_info; ext_info->name; ext_info++) {
715 ret = __iio_add_chan_devattr(ext_info->name,
716 chan,
717 ext_info->read ?
718 &iio_read_channel_ext_info : NULL,
719 ext_info->write ?
720 &iio_write_channel_ext_info : NULL,
721 i,
722 ext_info->shared,
723 &indio_dev->dev,
724 &indio_dev->channel_attr_list);
725 i++;
726 if (ret == -EBUSY && ext_info->shared)
727 continue;
728
729 if (ret)
730 goto error_ret;
731
732 attrcount++;
733 }
734 }
735
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100736 ret = attrcount;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100737error_ret:
738 return ret;
739}
740
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100741static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev,
Jonathan Cameron1d892712011-05-18 14:40:51 +0100742 struct iio_dev_attr *p)
743{
Jonathan Cameron1d892712011-05-18 14:40:51 +0100744 kfree(p->dev_attr.attr.name);
745 kfree(p);
746}
747
Jonathan Cameron1b732882011-05-18 14:41:43 +0100748static ssize_t iio_show_dev_name(struct device *dev,
749 struct device_attribute *attr,
750 char *buf)
751{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200752 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Jonathan Cameron1b732882011-05-18 14:41:43 +0100753 return sprintf(buf, "%s\n", indio_dev->name);
754}
755
756static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
757
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100758static int iio_device_register_sysfs(struct iio_dev *indio_dev)
Jonathan Cameron1d892712011-05-18 14:40:51 +0100759{
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100760 int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100761 struct iio_dev_attr *p, *n;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100762 struct attribute **attr;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100763
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100764 /* First count elements in any existing group */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100765 if (indio_dev->info->attrs) {
766 attr = indio_dev->info->attrs->attrs;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100767 while (*attr++ != NULL)
768 attrcount_orig++;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100769 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100770 attrcount = attrcount_orig;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100771 /*
772 * New channel registration method - relies on the fact a group does
Peter Meerwaldd25b3802012-08-26 13:43:00 +0100773 * not need to be initialized if its name is NULL.
Jonathan Cameron1d892712011-05-18 14:40:51 +0100774 */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100775 if (indio_dev->channels)
776 for (i = 0; i < indio_dev->num_channels; i++) {
777 ret = iio_device_add_channel_sysfs(indio_dev,
778 &indio_dev
Jonathan Cameron1d892712011-05-18 14:40:51 +0100779 ->channels[i]);
780 if (ret < 0)
781 goto error_clear_attrs;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100782 attrcount += ret;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100783 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100784
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100785 if (indio_dev->name)
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100786 attrcount++;
787
Thomas Meyerd83fb182011-11-29 22:08:00 +0100788 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
789 sizeof(indio_dev->chan_attr_group.attrs[0]),
790 GFP_KERNEL);
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100791 if (indio_dev->chan_attr_group.attrs == NULL) {
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100792 ret = -ENOMEM;
793 goto error_clear_attrs;
Jonathan Cameron1b732882011-05-18 14:41:43 +0100794 }
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100795 /* Copy across original attributes */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100796 if (indio_dev->info->attrs)
797 memcpy(indio_dev->chan_attr_group.attrs,
798 indio_dev->info->attrs->attrs,
799 sizeof(indio_dev->chan_attr_group.attrs[0])
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100800 *attrcount_orig);
801 attrn = attrcount_orig;
802 /* Add all elements from the list. */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100803 list_for_each_entry(p, &indio_dev->channel_attr_list, l)
804 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
805 if (indio_dev->name)
806 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100807
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100808 indio_dev->groups[indio_dev->groupcounter++] =
809 &indio_dev->chan_attr_group;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100810
Jonathan Cameron1d892712011-05-18 14:40:51 +0100811 return 0;
Jonathan Cameron1b732882011-05-18 14:41:43 +0100812
Jonathan Cameron1d892712011-05-18 14:40:51 +0100813error_clear_attrs:
814 list_for_each_entry_safe(p, n,
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100815 &indio_dev->channel_attr_list, l) {
Jonathan Cameron1d892712011-05-18 14:40:51 +0100816 list_del(&p->l);
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100817 iio_device_remove_and_free_read_attr(indio_dev, p);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100818 }
Jonathan Cameron1d892712011-05-18 14:40:51 +0100819
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100820 return ret;
Jonathan Cameron1d892712011-05-18 14:40:51 +0100821}
822
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100823static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +0100824{
Jonathan Cameron1d892712011-05-18 14:40:51 +0100825
826 struct iio_dev_attr *p, *n;
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100827
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100828 list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) {
Jonathan Cameron1d892712011-05-18 14:40:51 +0100829 list_del(&p->l);
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100830 iio_device_remove_and_free_read_attr(indio_dev, p);
Jonathan Cameron1d892712011-05-18 14:40:51 +0100831 }
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100832 kfree(indio_dev->chan_attr_group.attrs);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100833}
834
Jonathan Cameron847ec802009-08-18 18:06:19 +0100835static void iio_dev_release(struct device *device)
836{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200837 struct iio_dev *indio_dev = dev_to_iio_dev(device);
Lars-Peter Clausene407fd62012-06-04 10:41:42 +0200838 if (indio_dev->chrdev.dev)
839 cdev_del(&indio_dev->chrdev);
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100840 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
841 iio_device_unregister_trigger_consumer(indio_dev);
842 iio_device_unregister_eventset(indio_dev);
843 iio_device_unregister_sysfs(indio_dev);
Michael Henneriche553f182012-03-01 10:51:03 +0100844 iio_device_unregister_debugfs(indio_dev);
Lars-Peter Clausene407fd62012-06-04 10:41:42 +0200845
846 ida_simple_remove(&iio_ida, indio_dev->id);
847 kfree(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100848}
849
850static struct device_type iio_dev_type = {
851 .name = "iio_device",
852 .release = iio_dev_release,
853};
854
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200855struct iio_dev *iio_device_alloc(int sizeof_priv)
Jonathan Cameron847ec802009-08-18 18:06:19 +0100856{
Jonathan Cameron6f7c8ee2011-04-15 18:55:56 +0100857 struct iio_dev *dev;
858 size_t alloc_size;
859
860 alloc_size = sizeof(struct iio_dev);
861 if (sizeof_priv) {
862 alloc_size = ALIGN(alloc_size, IIO_ALIGN);
863 alloc_size += sizeof_priv;
864 }
865 /* ensure 32-byte alignment of whole construct ? */
866 alloc_size += IIO_ALIGN - 1;
867
868 dev = kzalloc(alloc_size, GFP_KERNEL);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100869
870 if (dev) {
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100871 dev->dev.groups = dev->groups;
Jonathan Cameron847ec802009-08-18 18:06:19 +0100872 dev->dev.type = &iio_dev_type;
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100873 dev->dev.bus = &iio_bus_type;
Jonathan Cameron847ec802009-08-18 18:06:19 +0100874 device_initialize(&dev->dev);
875 dev_set_drvdata(&dev->dev, (void *)dev);
876 mutex_init(&dev->mlock);
Jonathan Cameronac917a82012-02-15 19:48:00 +0000877 mutex_init(&dev->info_exist_lock);
Lars-Peter Clausene407fd62012-06-04 10:41:42 +0200878 INIT_LIST_HEAD(&dev->channel_attr_list);
Jonathan Camerona9e39f92011-09-14 13:01:25 +0100879
880 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
881 if (dev->id < 0) {
882 /* cannot use a dev_err as the name isn't available */
883 printk(KERN_ERR "Failed to get id\n");
884 kfree(dev);
885 return NULL;
886 }
887 dev_set_name(&dev->dev, "iio:device%d", dev->id);
Jonathan Cameron84b36ce2012-06-30 20:06:00 +0100888 INIT_LIST_HEAD(&dev->buffer_list);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100889 }
890
891 return dev;
892}
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200893EXPORT_SYMBOL(iio_device_alloc);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100894
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200895void iio_device_free(struct iio_dev *dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +0100896{
Lars-Peter Clausene407fd62012-06-04 10:41:42 +0200897 if (dev)
898 put_device(&dev->dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100899}
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200900EXPORT_SYMBOL(iio_device_free);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100901
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100902/**
Jonathan Cameron14555b12011-09-21 11:15:57 +0100903 * iio_chrdev_open() - chrdev file open for buffer access and ioctls
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100904 **/
905static int iio_chrdev_open(struct inode *inode, struct file *filp)
906{
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100907 struct iio_dev *indio_dev = container_of(inode->i_cdev,
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100908 struct iio_dev, chrdev);
Lars-Peter Clausenbb014432011-12-19 15:23:45 +0100909
910 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags))
911 return -EBUSY;
912
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100913 filp->private_data = indio_dev;
Jonathan Cameron30eb82f2011-09-21 11:16:02 +0100914
Lars-Peter Clausen79335142011-12-19 15:23:49 +0100915 return 0;
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100916}
917
918/**
Jonathan Cameron14555b12011-09-21 11:15:57 +0100919 * iio_chrdev_release() - chrdev file close buffer access and ioctls
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100920 **/
921static int iio_chrdev_release(struct inode *inode, struct file *filp)
922{
Lars-Peter Clausenbb014432011-12-19 15:23:45 +0100923 struct iio_dev *indio_dev = container_of(inode->i_cdev,
924 struct iio_dev, chrdev);
Lars-Peter Clausenbb014432011-12-19 15:23:45 +0100925 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags);
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100926 return 0;
927}
928
929/* Somewhat of a cross file organization violation - ioctls here are actually
930 * event related */
931static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
932{
933 struct iio_dev *indio_dev = filp->private_data;
934 int __user *ip = (int __user *)arg;
935 int fd;
936
937 if (cmd == IIO_GET_EVENT_FD_IOCTL) {
938 fd = iio_event_getfd(indio_dev);
939 if (copy_to_user(ip, &fd, sizeof(fd)))
940 return -EFAULT;
941 return 0;
942 }
943 return -EINVAL;
944}
945
Jonathan Cameron14555b12011-09-21 11:15:57 +0100946static const struct file_operations iio_buffer_fileops = {
947 .read = iio_buffer_read_first_n_outer_addr,
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100948 .release = iio_chrdev_release,
949 .open = iio_chrdev_open,
Jonathan Cameron14555b12011-09-21 11:15:57 +0100950 .poll = iio_buffer_poll_addr,
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100951 .owner = THIS_MODULE,
952 .llseek = noop_llseek,
953 .unlocked_ioctl = iio_ioctl,
954 .compat_ioctl = iio_ioctl,
955};
956
Michael Hennerich0f1acee2012-03-01 10:51:04 +0100957static const struct iio_buffer_setup_ops noop_ring_setup_ops;
958
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100959int iio_device_register(struct iio_dev *indio_dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +0100960{
961 int ret;
962
Jonathan Cameron1aa04272011-08-30 12:32:47 +0100963 /* configure elements for the chrdev */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100964 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100965
Michael Henneriche553f182012-03-01 10:51:03 +0100966 ret = iio_device_register_debugfs(indio_dev);
967 if (ret) {
968 dev_err(indio_dev->dev.parent,
969 "Failed to register debugfs interfaces\n");
970 goto error_ret;
971 }
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100972 ret = iio_device_register_sysfs(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100973 if (ret) {
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100974 dev_err(indio_dev->dev.parent,
Jonathan Cameron847ec802009-08-18 18:06:19 +0100975 "Failed to register sysfs interfaces\n");
Michael Henneriche553f182012-03-01 10:51:03 +0100976 goto error_unreg_debugfs;
Jonathan Cameron847ec802009-08-18 18:06:19 +0100977 }
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100978 ret = iio_device_register_eventset(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100979 if (ret) {
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100980 dev_err(indio_dev->dev.parent,
Roel Van Nyenc849d252010-04-29 19:27:31 +0200981 "Failed to register event set\n");
Jonathan Cameron847ec802009-08-18 18:06:19 +0100982 goto error_free_sysfs;
983 }
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100984 if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
985 iio_device_register_trigger_consumer(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +0100986
Michael Hennerich0f1acee2012-03-01 10:51:04 +0100987 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
988 indio_dev->setup_ops == NULL)
989 indio_dev->setup_ops = &noop_ring_setup_ops;
990
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100991 ret = device_add(&indio_dev->dev);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100992 if (ret < 0)
993 goto error_unreg_eventset;
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100994 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
995 indio_dev->chrdev.owner = indio_dev->info->driver_module;
996 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100997 if (ret < 0)
998 goto error_del_device;
Jonathan Cameron847ec802009-08-18 18:06:19 +0100999 return 0;
1000
Jonathan Cameron847ec802009-08-18 18:06:19 +01001001error_del_device:
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001002 device_del(&indio_dev->dev);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001003error_unreg_eventset:
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001004 iio_device_unregister_eventset(indio_dev);
Jonathan Cameron26d25ae2011-09-02 17:14:40 +01001005error_free_sysfs:
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001006 iio_device_unregister_sysfs(indio_dev);
Michael Henneriche553f182012-03-01 10:51:03 +01001007error_unreg_debugfs:
1008 iio_device_unregister_debugfs(indio_dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001009error_ret:
1010 return ret;
1011}
1012EXPORT_SYMBOL(iio_device_register);
1013
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +01001014void iio_device_unregister(struct iio_dev *indio_dev)
Jonathan Cameron847ec802009-08-18 18:06:19 +01001015{
Jonathan Cameronac917a82012-02-15 19:48:00 +00001016 mutex_lock(&indio_dev->info_exist_lock);
1017 indio_dev->info = NULL;
1018 mutex_unlock(&indio_dev->info_exist_lock);
Lars-Peter Clausene407fd62012-06-04 10:41:42 +02001019 device_del(&indio_dev->dev);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001020}
1021EXPORT_SYMBOL(iio_device_unregister);
Jonathan Cameron847ec802009-08-18 18:06:19 +01001022subsys_initcall(iio_init);
1023module_exit(iio_exit);
1024
Jonathan Cameronc8b95952012-09-02 21:27:56 +01001025MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
Jonathan Cameron847ec802009-08-18 18:06:19 +01001026MODULE_DESCRIPTION("Industrial I/O core");
1027MODULE_LICENSE("GPL");