Commit | Line | Data |
---|---|---|
847ec80b JC |
1 | /* 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 | ||
3176dd5d SK |
12 | #define pr_fmt(fmt) "iio-core: " fmt |
13 | ||
847ec80b JC |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/idr.h> | |
17 | #include <linux/kdev_t.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/fs.h> | |
847ec80b | 21 | #include <linux/poll.h> |
ffc18afa | 22 | #include <linux/sched.h> |
4439c935 | 23 | #include <linux/wait.h> |
847ec80b | 24 | #include <linux/cdev.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
8e7d9672 | 26 | #include <linux/anon_inodes.h> |
e553f182 | 27 | #include <linux/debugfs.h> |
06458e27 | 28 | #include <linux/iio/iio.h> |
df9c1c42 | 29 | #include "iio_core.h" |
6aea1c36 | 30 | #include "iio_core_trigger.h" |
06458e27 JC |
31 | #include <linux/iio/sysfs.h> |
32 | #include <linux/iio/events.h> | |
9e69c935 | 33 | #include <linux/iio/buffer.h> |
9dd1cb30 | 34 | |
99698b45 | 35 | /* IDA to assign each registered device a unique id */ |
b156cf70 | 36 | static DEFINE_IDA(iio_ida); |
847ec80b | 37 | |
f625cb97 | 38 | static dev_t iio_devt; |
847ec80b JC |
39 | |
40 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 41 | struct bus_type iio_bus_type = { |
847ec80b | 42 | .name = "iio", |
847ec80b | 43 | }; |
5aaaeba8 | 44 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 45 | |
e553f182 MH |
46 | static struct dentry *iio_debugfs_dentry; |
47 | ||
c6fc8062 JC |
48 | static const char * const iio_direction[] = { |
49 | [0] = "in", | |
50 | [1] = "out", | |
51 | }; | |
52 | ||
ade7ef7b | 53 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 54 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
55 | [IIO_CURRENT] = "current", |
56 | [IIO_POWER] = "power", | |
9bff02f8 | 57 | [IIO_ACCEL] = "accel", |
41ea040c | 58 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 59 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
60 | [IIO_LIGHT] = "illuminance", |
61 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 62 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 63 | [IIO_TEMP] = "temp", |
1d892719 JC |
64 | [IIO_INCLI] = "incli", |
65 | [IIO_ROT] = "rot", | |
1d892719 | 66 | [IIO_ANGL] = "angl", |
9bff02f8 | 67 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 68 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 69 | [IIO_ALTVOLTAGE] = "altvoltage", |
21cd1fab | 70 | [IIO_CCT] = "cct", |
c4f0c693 | 71 | [IIO_PRESSURE] = "pressure", |
ac216aa2 | 72 | [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
1d892719 JC |
73 | }; |
74 | ||
330c6c57 | 75 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
76 | [IIO_MOD_X] = "x", |
77 | [IIO_MOD_Y] = "y", | |
78 | [IIO_MOD_Z] = "z", | |
8f5879b2 | 79 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 80 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
81 | [IIO_MOD_LIGHT_BOTH] = "both", |
82 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
83 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
84 | [IIO_MOD_LIGHT_RED] = "red", | |
85 | [IIO_MOD_LIGHT_GREEN] = "green", | |
86 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
5082f405 | 87 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
88 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
89 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
90 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
91 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
92 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
93 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
1d892719 JC |
94 | }; |
95 | ||
96 | /* relies on pairs of these shared then separate */ | |
97 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
98 | [IIO_CHAN_INFO_RAW] = "raw", |
99 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
100 | [IIO_CHAN_INFO_SCALE] = "scale", |
101 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
102 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
103 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
104 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
105 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
106 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
107 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
108 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
109 | = "filter_low_pass_3db_frequency", | |
ce85a1cb | 110 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
111 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
112 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 113 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 114 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 115 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
1d892719 JC |
116 | }; |
117 | ||
a7e57dce SK |
118 | /** |
119 | * iio_find_channel_from_si() - get channel from its scan index | |
120 | * @indio_dev: device | |
121 | * @si: scan index to match | |
122 | */ | |
5fb21c82 JC |
123 | const struct iio_chan_spec |
124 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
125 | { | |
126 | int i; | |
127 | ||
128 | for (i = 0; i < indio_dev->num_channels; i++) | |
129 | if (indio_dev->channels[i].scan_index == si) | |
130 | return &indio_dev->channels[i]; | |
131 | return NULL; | |
132 | } | |
133 | ||
847ec80b JC |
134 | /* This turns up an awful lot */ |
135 | ssize_t iio_read_const_attr(struct device *dev, | |
136 | struct device_attribute *attr, | |
137 | char *buf) | |
138 | { | |
139 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
140 | } | |
141 | EXPORT_SYMBOL(iio_read_const_attr); | |
142 | ||
847ec80b JC |
143 | static int __init iio_init(void) |
144 | { | |
145 | int ret; | |
146 | ||
5aaaeba8 JC |
147 | /* Register sysfs bus */ |
148 | ret = bus_register(&iio_bus_type); | |
847ec80b | 149 | if (ret < 0) { |
3176dd5d | 150 | pr_err("could not register bus type\n"); |
847ec80b JC |
151 | goto error_nothing; |
152 | } | |
153 | ||
9aa1a167 JC |
154 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
155 | if (ret < 0) { | |
3176dd5d | 156 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 157 | goto error_unregister_bus_type; |
9aa1a167 | 158 | } |
847ec80b | 159 | |
e553f182 MH |
160 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
161 | ||
847ec80b JC |
162 | return 0; |
163 | ||
5aaaeba8 JC |
164 | error_unregister_bus_type: |
165 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
166 | error_nothing: |
167 | return ret; | |
168 | } | |
169 | ||
170 | static void __exit iio_exit(void) | |
171 | { | |
9aa1a167 JC |
172 | if (iio_devt) |
173 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 174 | bus_unregister(&iio_bus_type); |
e553f182 MH |
175 | debugfs_remove(iio_debugfs_dentry); |
176 | } | |
177 | ||
178 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
179 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
180 | size_t count, loff_t *ppos) | |
181 | { | |
182 | struct iio_dev *indio_dev = file->private_data; | |
183 | char buf[20]; | |
184 | unsigned val = 0; | |
185 | ssize_t len; | |
186 | int ret; | |
187 | ||
188 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
189 | indio_dev->cached_reg_addr, | |
190 | 0, &val); | |
191 | if (ret) | |
192 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
193 | ||
194 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
195 | ||
196 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
197 | } | |
198 | ||
199 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
200 | const char __user *userbuf, size_t count, loff_t *ppos) | |
201 | { | |
202 | struct iio_dev *indio_dev = file->private_data; | |
203 | unsigned reg, val; | |
204 | char buf[80]; | |
205 | int ret; | |
206 | ||
207 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
208 | if (copy_from_user(buf, userbuf, count)) | |
209 | return -EFAULT; | |
210 | ||
211 | buf[count] = 0; | |
212 | ||
213 | ret = sscanf(buf, "%i %i", ®, &val); | |
214 | ||
215 | switch (ret) { | |
216 | case 1: | |
217 | indio_dev->cached_reg_addr = reg; | |
218 | break; | |
219 | case 2: | |
220 | indio_dev->cached_reg_addr = reg; | |
221 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
222 | val, NULL); | |
223 | if (ret) { | |
224 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
225 | __func__); | |
226 | return ret; | |
227 | } | |
228 | break; | |
229 | default: | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
233 | return count; | |
234 | } | |
235 | ||
236 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 237 | .open = simple_open, |
e553f182 MH |
238 | .read = iio_debugfs_read_reg, |
239 | .write = iio_debugfs_write_reg, | |
240 | }; | |
241 | ||
242 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
243 | { | |
244 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
245 | } |
246 | ||
e553f182 MH |
247 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
248 | { | |
249 | struct dentry *d; | |
250 | ||
251 | if (indio_dev->info->debugfs_reg_access == NULL) | |
252 | return 0; | |
253 | ||
abd5a2fb | 254 | if (!iio_debugfs_dentry) |
e553f182 MH |
255 | return 0; |
256 | ||
257 | indio_dev->debugfs_dentry = | |
258 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
259 | iio_debugfs_dentry); | |
e553f182 MH |
260 | if (indio_dev->debugfs_dentry == NULL) { |
261 | dev_warn(indio_dev->dev.parent, | |
262 | "Failed to create debugfs directory\n"); | |
263 | return -EFAULT; | |
264 | } | |
265 | ||
266 | d = debugfs_create_file("direct_reg_access", 0644, | |
267 | indio_dev->debugfs_dentry, | |
268 | indio_dev, &iio_debugfs_reg_fops); | |
269 | if (!d) { | |
270 | iio_device_unregister_debugfs(indio_dev); | |
271 | return -ENOMEM; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | #else | |
277 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
283 | { | |
284 | } | |
285 | #endif /* CONFIG_DEBUG_FS */ | |
286 | ||
4fee7e16 LPC |
287 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
288 | struct device_attribute *attr, | |
289 | char *buf) | |
290 | { | |
e53f5ac5 | 291 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
292 | 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 | ||
fc6d1139 | 297 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
298 | } |
299 | ||
300 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
301 | struct device_attribute *attr, | |
302 | const char *buf, | |
303 | size_t len) | |
304 | { | |
e53f5ac5 | 305 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
306 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
307 | const struct iio_chan_spec_ext_info *ext_info; | |
308 | ||
309 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
310 | ||
fc6d1139 MH |
311 | return ext_info->write(indio_dev, ext_info->private, |
312 | this_attr->c, buf, len); | |
4fee7e16 LPC |
313 | } |
314 | ||
5212cc8a LPC |
315 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
316 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
317 | { | |
318 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
319 | unsigned int i; | |
320 | size_t len = 0; | |
321 | ||
322 | if (!e->num_items) | |
323 | return 0; | |
324 | ||
325 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 326 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
327 | |
328 | /* replace last space with a newline */ | |
329 | buf[len - 1] = '\n'; | |
330 | ||
331 | return len; | |
332 | } | |
333 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
334 | ||
335 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
336 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
337 | { | |
338 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
339 | int i; | |
340 | ||
341 | if (!e->get) | |
342 | return -EINVAL; | |
343 | ||
344 | i = e->get(indio_dev, chan); | |
345 | if (i < 0) | |
346 | return i; | |
347 | else if (i >= e->num_items) | |
348 | return -EINVAL; | |
349 | ||
598db581 | 350 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
351 | } |
352 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
353 | ||
354 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
355 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
356 | size_t len) | |
357 | { | |
358 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
359 | unsigned int i; | |
360 | int ret; | |
361 | ||
362 | if (!e->set) | |
363 | return -EINVAL; | |
364 | ||
365 | for (i = 0; i < e->num_items; i++) { | |
366 | if (sysfs_streq(buf, e->items[i])) | |
367 | break; | |
368 | } | |
369 | ||
370 | if (i == e->num_items) | |
371 | return -EINVAL; | |
372 | ||
373 | ret = e->set(indio_dev, chan, i); | |
374 | return ret ? ret : len; | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
377 | ||
3661f3f5 LPC |
378 | /** |
379 | * iio_format_value() - Formats a IIO value into its string representation | |
380 | * @buf: The buffer to which the formated value gets written | |
381 | * @type: One of the IIO_VAL_... constants. This decides how the val and val2 | |
382 | * parameters are formatted. | |
9fbfb4b3 | 383 | * @vals: pointer to the values, exact meaning depends on the type parameter. |
3661f3f5 | 384 | */ |
9fbfb4b3 | 385 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
847ec80b | 386 | { |
7985e7c1 | 387 | unsigned long long tmp; |
67eedba3 | 388 | bool scale_db = false; |
1d892719 | 389 | |
3661f3f5 | 390 | switch (type) { |
67eedba3 | 391 | case IIO_VAL_INT: |
9fbfb4b3 | 392 | return sprintf(buf, "%d\n", vals[0]); |
67eedba3 MH |
393 | case IIO_VAL_INT_PLUS_MICRO_DB: |
394 | scale_db = true; | |
395 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 SP |
396 | if (vals[1] < 0) |
397 | return sprintf(buf, "-%ld.%06u%s\n", abs(vals[0]), | |
398 | -vals[1], | |
67eedba3 | 399 | scale_db ? " dB" : ""); |
1d892719 | 400 | else |
9fbfb4b3 | 401 | return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
67eedba3 MH |
402 | scale_db ? " dB" : ""); |
403 | case IIO_VAL_INT_PLUS_NANO: | |
9fbfb4b3 SP |
404 | if (vals[1] < 0) |
405 | return sprintf(buf, "-%ld.%09u\n", abs(vals[0]), | |
406 | -vals[1]); | |
71646e2c | 407 | else |
9fbfb4b3 | 408 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
7985e7c1 | 409 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 SP |
410 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
411 | vals[1] = do_div(tmp, 1000000000LL); | |
412 | vals[0] = tmp; | |
413 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
103d9fb9 | 414 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 SP |
415 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
416 | vals[1] = do_div(tmp, 1000000000LL); | |
417 | vals[0] = tmp; | |
418 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
419 | case IIO_VAL_INT_MULTIPLE: | |
420 | { | |
421 | int i; | |
422 | int len = 0; | |
423 | ||
424 | for (i = 0; i < size; ++i) | |
425 | len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", | |
426 | vals[i]); | |
427 | len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); | |
428 | return len; | |
429 | } | |
67eedba3 | 430 | default: |
1d892719 | 431 | return 0; |
67eedba3 | 432 | } |
1d892719 JC |
433 | } |
434 | ||
3661f3f5 LPC |
435 | static ssize_t iio_read_channel_info(struct device *dev, |
436 | struct device_attribute *attr, | |
437 | char *buf) | |
438 | { | |
439 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
440 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
441 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
442 | int ret; | |
443 | int val_len = 2; | |
444 | ||
445 | if (indio_dev->info->read_raw_multi) | |
446 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
447 | INDIO_MAX_RAW_ELEMENTS, | |
448 | vals, &val_len, | |
449 | this_attr->address); | |
450 | else | |
451 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
452 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
453 | |
454 | if (ret < 0) | |
455 | return ret; | |
456 | ||
9fbfb4b3 | 457 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
458 | } |
459 | ||
6807d721 LPC |
460 | /** |
461 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
462 | * @str: The string to parse | |
463 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
464 | * @integer: The integer part of the number | |
465 | * @fract: The fractional part of the number | |
466 | * | |
467 | * Returns 0 on success, or a negative error code if the string could not be | |
468 | * parsed. | |
469 | */ | |
470 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
471 | int *integer, int *fract) | |
472 | { | |
473 | int i = 0, f = 0; | |
474 | bool integer_part = true, negative = false; | |
475 | ||
476 | if (str[0] == '-') { | |
477 | negative = true; | |
478 | str++; | |
479 | } else if (str[0] == '+') { | |
480 | str++; | |
481 | } | |
482 | ||
483 | while (*str) { | |
484 | if ('0' <= *str && *str <= '9') { | |
485 | if (integer_part) { | |
486 | i = i * 10 + *str - '0'; | |
487 | } else { | |
488 | f += fract_mult * (*str - '0'); | |
489 | fract_mult /= 10; | |
490 | } | |
491 | } else if (*str == '\n') { | |
492 | if (*(str + 1) == '\0') | |
493 | break; | |
494 | else | |
495 | return -EINVAL; | |
496 | } else if (*str == '.' && integer_part) { | |
497 | integer_part = false; | |
498 | } else { | |
499 | return -EINVAL; | |
500 | } | |
501 | str++; | |
502 | } | |
503 | ||
504 | if (negative) { | |
505 | if (i) | |
506 | i = -i; | |
507 | else | |
508 | f = -f; | |
509 | } | |
510 | ||
511 | *integer = i; | |
512 | *fract = f; | |
513 | ||
514 | return 0; | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
517 | ||
1d892719 JC |
518 | static ssize_t iio_write_channel_info(struct device *dev, |
519 | struct device_attribute *attr, | |
520 | const char *buf, | |
521 | size_t len) | |
522 | { | |
e53f5ac5 | 523 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 524 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
525 | int ret, fract_mult = 100000; |
526 | int integer, fract; | |
1d892719 JC |
527 | |
528 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 529 | if (!indio_dev->info->write_raw) |
1d892719 | 530 | return -EINVAL; |
5c04af04 MH |
531 | |
532 | if (indio_dev->info->write_raw_get_fmt) | |
533 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
534 | this_attr->c, this_attr->address)) { | |
535 | case IIO_VAL_INT_PLUS_MICRO: | |
536 | fract_mult = 100000; | |
537 | break; | |
538 | case IIO_VAL_INT_PLUS_NANO: | |
539 | fract_mult = 100000000; | |
540 | break; | |
541 | default: | |
542 | return -EINVAL; | |
543 | } | |
544 | ||
6807d721 LPC |
545 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
546 | if (ret) | |
547 | return ret; | |
1d892719 | 548 | |
6fe8135f | 549 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 550 | integer, fract, this_attr->address); |
1d892719 JC |
551 | if (ret) |
552 | return ret; | |
553 | ||
554 | return len; | |
555 | } | |
556 | ||
df9c1c42 | 557 | static |
1d892719 JC |
558 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
559 | const char *postfix, | |
560 | struct iio_chan_spec const *chan, | |
561 | ssize_t (*readfunc)(struct device *dev, | |
562 | struct device_attribute *attr, | |
563 | char *buf), | |
564 | ssize_t (*writefunc)(struct device *dev, | |
565 | struct device_attribute *attr, | |
566 | const char *buf, | |
567 | size_t len), | |
3704432f | 568 | enum iio_shared_by shared_by) |
1d892719 | 569 | { |
3704432f | 570 | int ret = 0; |
7bbcf7e1 | 571 | char *name = NULL; |
3704432f | 572 | char *full_postfix; |
1d892719 | 573 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 574 | |
ade7ef7b | 575 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 576 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
577 | if (chan->extend_name) |
578 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
579 | iio_modifier_names[chan | |
580 | ->channel2], | |
581 | chan->extend_name, | |
582 | postfix); | |
583 | else | |
584 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
585 | iio_modifier_names[chan | |
586 | ->channel2], | |
587 | postfix); | |
588 | } else { | |
77bfa8ba | 589 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
590 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
591 | else | |
592 | full_postfix = kasprintf(GFP_KERNEL, | |
593 | "%s_%s", | |
594 | chan->extend_name, | |
595 | postfix); | |
596 | } | |
3704432f JC |
597 | if (full_postfix == NULL) |
598 | return -ENOMEM; | |
1d892719 | 599 | |
4abf6f8b | 600 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 601 | switch (shared_by) { |
c006ec83 | 602 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 603 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
604 | break; |
605 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 606 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
607 | iio_direction[chan->output], |
608 | full_postfix); | |
609 | break; | |
3704432f | 610 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 611 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
612 | iio_direction[chan->output], |
613 | iio_chan_type_name_spec[chan->type], | |
614 | iio_chan_type_name_spec[chan->type], | |
615 | full_postfix); | |
3704432f JC |
616 | break; |
617 | case IIO_SEPARATE: | |
618 | if (!chan->indexed) { | |
619 | WARN_ON("Differential channels must be indexed\n"); | |
620 | ret = -EINVAL; | |
621 | goto error_free_full_postfix; | |
622 | } | |
7bbcf7e1 | 623 | name = kasprintf(GFP_KERNEL, |
3704432f | 624 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
625 | iio_direction[chan->output], |
626 | iio_chan_type_name_spec[chan->type], | |
627 | chan->channel, | |
628 | iio_chan_type_name_spec[chan->type], | |
629 | chan->channel2, | |
630 | full_postfix); | |
3704432f | 631 | break; |
ade7ef7b JC |
632 | } |
633 | } else { /* Single ended */ | |
3704432f | 634 | switch (shared_by) { |
c006ec83 | 635 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 636 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
637 | break; |
638 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 639 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
640 | iio_direction[chan->output], |
641 | full_postfix); | |
642 | break; | |
3704432f | 643 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 644 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
645 | iio_direction[chan->output], |
646 | iio_chan_type_name_spec[chan->type], | |
647 | full_postfix); | |
3704432f JC |
648 | break; |
649 | ||
650 | case IIO_SEPARATE: | |
651 | if (chan->indexed) | |
7bbcf7e1 | 652 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
653 | iio_direction[chan->output], |
654 | iio_chan_type_name_spec[chan->type], | |
655 | chan->channel, | |
656 | full_postfix); | |
657 | else | |
7bbcf7e1 | 658 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
659 | iio_direction[chan->output], |
660 | iio_chan_type_name_spec[chan->type], | |
661 | full_postfix); | |
662 | break; | |
663 | } | |
ade7ef7b | 664 | } |
7bbcf7e1 | 665 | if (name == NULL) { |
1d892719 JC |
666 | ret = -ENOMEM; |
667 | goto error_free_full_postfix; | |
668 | } | |
7bbcf7e1 | 669 | dev_attr->attr.name = name; |
1d892719 JC |
670 | |
671 | if (readfunc) { | |
672 | dev_attr->attr.mode |= S_IRUGO; | |
673 | dev_attr->show = readfunc; | |
674 | } | |
675 | ||
676 | if (writefunc) { | |
677 | dev_attr->attr.mode |= S_IWUSR; | |
678 | dev_attr->store = writefunc; | |
679 | } | |
7bbcf7e1 | 680 | |
1d892719 JC |
681 | error_free_full_postfix: |
682 | kfree(full_postfix); | |
3704432f | 683 | |
1d892719 JC |
684 | return ret; |
685 | } | |
686 | ||
df9c1c42 | 687 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
688 | { |
689 | kfree(dev_attr->attr.name); | |
690 | } | |
691 | ||
692 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
693 | struct iio_chan_spec const *chan, |
694 | ssize_t (*readfunc)(struct device *dev, | |
695 | struct device_attribute *attr, | |
696 | char *buf), | |
697 | ssize_t (*writefunc)(struct device *dev, | |
698 | struct device_attribute *attr, | |
699 | const char *buf, | |
700 | size_t len), | |
e614a54b | 701 | u64 mask, |
3704432f | 702 | enum iio_shared_by shared_by, |
1d892719 JC |
703 | struct device *dev, |
704 | struct list_head *attr_list) | |
705 | { | |
706 | int ret; | |
707 | struct iio_dev_attr *iio_attr, *t; | |
708 | ||
670c1103 | 709 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
710 | if (iio_attr == NULL) |
711 | return -ENOMEM; | |
1d892719 JC |
712 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
713 | postfix, chan, | |
3704432f | 714 | readfunc, writefunc, shared_by); |
1d892719 JC |
715 | if (ret) |
716 | goto error_iio_dev_attr_free; | |
717 | iio_attr->c = chan; | |
718 | iio_attr->address = mask; | |
719 | list_for_each_entry(t, attr_list, l) | |
720 | if (strcmp(t->dev_attr.attr.name, | |
721 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 722 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
723 | dev_err(dev, "tried to double register : %s\n", |
724 | t->dev_attr.attr.name); | |
725 | ret = -EBUSY; | |
726 | goto error_device_attr_deinit; | |
727 | } | |
1d892719 JC |
728 | list_add(&iio_attr->l, attr_list); |
729 | ||
730 | return 0; | |
731 | ||
732 | error_device_attr_deinit: | |
733 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
734 | error_iio_dev_attr_free: | |
735 | kfree(iio_attr); | |
1d892719 JC |
736 | return ret; |
737 | } | |
738 | ||
3704432f JC |
739 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
740 | struct iio_chan_spec const *chan, | |
741 | enum iio_shared_by shared_by, | |
742 | const long *infomask) | |
1d892719 | 743 | { |
3704432f | 744 | int i, ret, attrcount = 0; |
1d892719 | 745 | |
3704432f | 746 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
747 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
748 | return -EINVAL; | |
8655cc49 JC |
749 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
750 | chan, | |
751 | &iio_read_channel_info, | |
752 | &iio_write_channel_info, | |
753 | i, | |
3704432f | 754 | shared_by, |
8655cc49 JC |
755 | &indio_dev->dev, |
756 | &indio_dev->channel_attr_list); | |
3704432f | 757 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 758 | continue; |
3704432f JC |
759 | else if (ret < 0) |
760 | return ret; | |
8655cc49 JC |
761 | attrcount++; |
762 | } | |
5f420b42 | 763 | |
3704432f JC |
764 | return attrcount; |
765 | } | |
766 | ||
767 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, | |
768 | struct iio_chan_spec const *chan) | |
769 | { | |
770 | int ret, attrcount = 0; | |
771 | const struct iio_chan_spec_ext_info *ext_info; | |
772 | ||
773 | if (chan->channel < 0) | |
774 | return 0; | |
775 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
776 | IIO_SEPARATE, | |
777 | &chan->info_mask_separate); | |
778 | if (ret < 0) | |
779 | return ret; | |
780 | attrcount += ret; | |
781 | ||
782 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
783 | IIO_SHARED_BY_TYPE, | |
784 | &chan->info_mask_shared_by_type); | |
785 | if (ret < 0) | |
786 | return ret; | |
787 | attrcount += ret; | |
788 | ||
c006ec83 JC |
789 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
790 | IIO_SHARED_BY_DIR, | |
791 | &chan->info_mask_shared_by_dir); | |
792 | if (ret < 0) | |
793 | return ret; | |
794 | attrcount += ret; | |
795 | ||
796 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
797 | IIO_SHARED_BY_ALL, | |
798 | &chan->info_mask_shared_by_all); | |
799 | if (ret < 0) | |
800 | return ret; | |
801 | attrcount += ret; | |
802 | ||
5f420b42 LPC |
803 | if (chan->ext_info) { |
804 | unsigned int i = 0; | |
805 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
806 | ret = __iio_add_chan_devattr(ext_info->name, | |
807 | chan, | |
808 | ext_info->read ? | |
809 | &iio_read_channel_ext_info : NULL, | |
810 | ext_info->write ? | |
811 | &iio_write_channel_ext_info : NULL, | |
812 | i, | |
813 | ext_info->shared, | |
814 | &indio_dev->dev, | |
815 | &indio_dev->channel_attr_list); | |
816 | i++; | |
817 | if (ret == -EBUSY && ext_info->shared) | |
818 | continue; | |
819 | ||
820 | if (ret) | |
3704432f | 821 | return ret; |
5f420b42 LPC |
822 | |
823 | attrcount++; | |
824 | } | |
825 | } | |
826 | ||
3704432f | 827 | return attrcount; |
1d892719 JC |
828 | } |
829 | ||
84088ebd LPC |
830 | /** |
831 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
832 | * @attr_list: List of IIO device attributes | |
833 | * | |
834 | * This function frees the memory allocated for each of the IIO device | |
835 | * attributes in the list. Note: if you want to reuse the list after calling | |
836 | * this function you have to reinitialize it using INIT_LIST_HEAD(). | |
837 | */ | |
838 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 839 | { |
84088ebd LPC |
840 | struct iio_dev_attr *p, *n; |
841 | ||
842 | list_for_each_entry_safe(p, n, attr_list, l) { | |
843 | kfree(p->dev_attr.attr.name); | |
844 | kfree(p); | |
845 | } | |
1d892719 JC |
846 | } |
847 | ||
1b732888 JC |
848 | static ssize_t iio_show_dev_name(struct device *dev, |
849 | struct device_attribute *attr, | |
850 | char *buf) | |
851 | { | |
e53f5ac5 | 852 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 853 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
854 | } |
855 | ||
856 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
857 | ||
f8c6f4e9 | 858 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 859 | { |
26d25ae3 | 860 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 861 | struct iio_dev_attr *p; |
26d25ae3 | 862 | struct attribute **attr; |
1d892719 | 863 | |
26d25ae3 | 864 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
865 | if (indio_dev->info->attrs) { |
866 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
867 | while (*attr++ != NULL) |
868 | attrcount_orig++; | |
847ec80b | 869 | } |
26d25ae3 | 870 | attrcount = attrcount_orig; |
1d892719 JC |
871 | /* |
872 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 873 | * not need to be initialized if its name is NULL. |
1d892719 | 874 | */ |
f8c6f4e9 JC |
875 | if (indio_dev->channels) |
876 | for (i = 0; i < indio_dev->num_channels; i++) { | |
877 | ret = iio_device_add_channel_sysfs(indio_dev, | |
878 | &indio_dev | |
1d892719 JC |
879 | ->channels[i]); |
880 | if (ret < 0) | |
881 | goto error_clear_attrs; | |
26d25ae3 | 882 | attrcount += ret; |
1d892719 | 883 | } |
26d25ae3 | 884 | |
f8c6f4e9 | 885 | if (indio_dev->name) |
26d25ae3 JC |
886 | attrcount++; |
887 | ||
d83fb184 TM |
888 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
889 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
890 | GFP_KERNEL); | |
f8c6f4e9 | 891 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
892 | ret = -ENOMEM; |
893 | goto error_clear_attrs; | |
1b732888 | 894 | } |
26d25ae3 | 895 | /* Copy across original attributes */ |
f8c6f4e9 JC |
896 | if (indio_dev->info->attrs) |
897 | memcpy(indio_dev->chan_attr_group.attrs, | |
898 | indio_dev->info->attrs->attrs, | |
899 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
900 | *attrcount_orig); |
901 | attrn = attrcount_orig; | |
902 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
903 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
904 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
905 | if (indio_dev->name) | |
906 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 907 | |
f8c6f4e9 JC |
908 | indio_dev->groups[indio_dev->groupcounter++] = |
909 | &indio_dev->chan_attr_group; | |
26d25ae3 | 910 | |
1d892719 | 911 | return 0; |
1b732888 | 912 | |
1d892719 | 913 | error_clear_attrs: |
84088ebd | 914 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 915 | |
26d25ae3 | 916 | return ret; |
847ec80b JC |
917 | } |
918 | ||
f8c6f4e9 | 919 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 920 | { |
1d892719 | 921 | |
84088ebd | 922 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 923 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
924 | } |
925 | ||
847ec80b JC |
926 | static void iio_dev_release(struct device *device) |
927 | { | |
e53f5ac5 | 928 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
f8c6f4e9 JC |
929 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
930 | iio_device_unregister_trigger_consumer(indio_dev); | |
931 | iio_device_unregister_eventset(indio_dev); | |
932 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 933 | |
9e69c935 LPC |
934 | iio_buffer_put(indio_dev->buffer); |
935 | ||
e407fd65 LPC |
936 | ida_simple_remove(&iio_ida, indio_dev->id); |
937 | kfree(indio_dev); | |
847ec80b JC |
938 | } |
939 | ||
17d82b47 | 940 | struct device_type iio_device_type = { |
847ec80b JC |
941 | .name = "iio_device", |
942 | .release = iio_dev_release, | |
943 | }; | |
944 | ||
a7e57dce SK |
945 | /** |
946 | * iio_device_alloc() - allocate an iio_dev from a driver | |
947 | * @sizeof_priv: Space to allocate for private structure. | |
948 | **/ | |
7cbb7537 | 949 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 950 | { |
6f7c8ee5 JC |
951 | struct iio_dev *dev; |
952 | size_t alloc_size; | |
953 | ||
954 | alloc_size = sizeof(struct iio_dev); | |
955 | if (sizeof_priv) { | |
956 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
957 | alloc_size += sizeof_priv; | |
958 | } | |
959 | /* ensure 32-byte alignment of whole construct ? */ | |
960 | alloc_size += IIO_ALIGN - 1; | |
961 | ||
962 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
963 | |
964 | if (dev) { | |
26d25ae3 | 965 | dev->dev.groups = dev->groups; |
17d82b47 | 966 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 967 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
968 | device_initialize(&dev->dev); |
969 | dev_set_drvdata(&dev->dev, (void *)dev); | |
970 | mutex_init(&dev->mlock); | |
ac917a81 | 971 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 972 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
973 | |
974 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
975 | if (dev->id < 0) { | |
976 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 977 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
978 | kfree(dev); |
979 | return NULL; | |
980 | } | |
981 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 982 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
983 | } |
984 | ||
985 | return dev; | |
986 | } | |
7cbb7537 | 987 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 988 | |
a7e57dce SK |
989 | /** |
990 | * iio_device_free() - free an iio_dev from a driver | |
991 | * @dev: the iio_dev associated with the device | |
992 | **/ | |
7cbb7537 | 993 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 994 | { |
e407fd65 LPC |
995 | if (dev) |
996 | put_device(&dev->dev); | |
847ec80b | 997 | } |
7cbb7537 | 998 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 999 | |
9dabaf5e GS |
1000 | static void devm_iio_device_release(struct device *dev, void *res) |
1001 | { | |
1002 | iio_device_free(*(struct iio_dev **)res); | |
1003 | } | |
1004 | ||
1005 | static int devm_iio_device_match(struct device *dev, void *res, void *data) | |
1006 | { | |
1007 | struct iio_dev **r = res; | |
1008 | if (!r || !*r) { | |
1009 | WARN_ON(!r || !*r); | |
1010 | return 0; | |
1011 | } | |
1012 | return *r == data; | |
1013 | } | |
1014 | ||
a7e57dce SK |
1015 | /** |
1016 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1017 | * @dev: Device to allocate iio_dev for | |
1018 | * @sizeof_priv: Space to allocate for private structure. | |
1019 | * | |
1020 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1021 | * automatically freed on driver detach. | |
1022 | * | |
1023 | * If an iio_dev allocated with this function needs to be freed separately, | |
1024 | * devm_iio_device_free() must be used. | |
1025 | * | |
1026 | * RETURNS: | |
1027 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1028 | */ | |
9dabaf5e GS |
1029 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1030 | { | |
1031 | struct iio_dev **ptr, *iio_dev; | |
1032 | ||
1033 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1034 | GFP_KERNEL); | |
1035 | if (!ptr) | |
1036 | return NULL; | |
1037 | ||
1038 | /* use raw alloc_dr for kmalloc caller tracing */ | |
1039 | iio_dev = iio_device_alloc(sizeof_priv); | |
1040 | if (iio_dev) { | |
1041 | *ptr = iio_dev; | |
1042 | devres_add(dev, ptr); | |
1043 | } else { | |
1044 | devres_free(ptr); | |
1045 | } | |
1046 | ||
1047 | return iio_dev; | |
1048 | } | |
1049 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1050 | ||
a7e57dce SK |
1051 | /** |
1052 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1053 | * @dev: Device this iio_dev belongs to | |
1054 | * @iio_dev: the iio_dev associated with the device | |
1055 | * | |
1056 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1057 | */ | |
9dabaf5e GS |
1058 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1059 | { | |
1060 | int rc; | |
1061 | ||
1062 | rc = devres_release(dev, devm_iio_device_release, | |
1063 | devm_iio_device_match, iio_dev); | |
1064 | WARN_ON(rc); | |
1065 | } | |
1066 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1067 | ||
1aa04278 | 1068 | /** |
14555b14 | 1069 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
1070 | **/ |
1071 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1072 | { | |
f8c6f4e9 | 1073 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1074 | struct iio_dev, chrdev); |
bb01443e LPC |
1075 | |
1076 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1077 | return -EBUSY; | |
1078 | ||
cadc2125 LPC |
1079 | iio_device_get(indio_dev); |
1080 | ||
f8c6f4e9 | 1081 | filp->private_data = indio_dev; |
30eb82f0 | 1082 | |
79335140 | 1083 | return 0; |
1aa04278 JC |
1084 | } |
1085 | ||
1086 | /** | |
14555b14 | 1087 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
1088 | **/ |
1089 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
1090 | { | |
bb01443e LPC |
1091 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1092 | struct iio_dev, chrdev); | |
bb01443e | 1093 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1094 | iio_device_put(indio_dev); |
1095 | ||
1aa04278 JC |
1096 | return 0; |
1097 | } | |
1098 | ||
1099 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1100 | * event related */ | |
1101 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1102 | { | |
1103 | struct iio_dev *indio_dev = filp->private_data; | |
1104 | int __user *ip = (int __user *)arg; | |
1105 | int fd; | |
1106 | ||
f18e7a06 LPC |
1107 | if (!indio_dev->info) |
1108 | return -ENODEV; | |
1109 | ||
1aa04278 JC |
1110 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1111 | fd = iio_event_getfd(indio_dev); | |
1112 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
1113 | return -EFAULT; | |
1114 | return 0; | |
1115 | } | |
1116 | return -EINVAL; | |
1117 | } | |
1118 | ||
14555b14 JC |
1119 | static const struct file_operations iio_buffer_fileops = { |
1120 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1121 | .release = iio_chrdev_release, |
1122 | .open = iio_chrdev_open, | |
14555b14 | 1123 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1124 | .owner = THIS_MODULE, |
1125 | .llseek = noop_llseek, | |
1126 | .unlocked_ioctl = iio_ioctl, | |
1127 | .compat_ioctl = iio_ioctl, | |
1128 | }; | |
1129 | ||
0f1acee5 MH |
1130 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1131 | ||
a7e57dce SK |
1132 | /** |
1133 | * iio_device_register() - register a device with the IIO subsystem | |
1134 | * @indio_dev: Device structure filled by the device driver | |
1135 | **/ | |
f8c6f4e9 | 1136 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1137 | { |
1138 | int ret; | |
1139 | ||
17d82b47 GR |
1140 | /* If the calling driver did not initialize of_node, do it here */ |
1141 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1142 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1143 | ||
1aa04278 | 1144 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1145 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1146 | |
e553f182 MH |
1147 | ret = iio_device_register_debugfs(indio_dev); |
1148 | if (ret) { | |
1149 | dev_err(indio_dev->dev.parent, | |
1150 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1151 | return ret; |
e553f182 | 1152 | } |
f8c6f4e9 | 1153 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1154 | if (ret) { |
f8c6f4e9 | 1155 | dev_err(indio_dev->dev.parent, |
847ec80b | 1156 | "Failed to register sysfs interfaces\n"); |
e553f182 | 1157 | goto error_unreg_debugfs; |
847ec80b | 1158 | } |
f8c6f4e9 | 1159 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1160 | if (ret) { |
f8c6f4e9 | 1161 | dev_err(indio_dev->dev.parent, |
c849d253 | 1162 | "Failed to register event set\n"); |
847ec80b JC |
1163 | goto error_free_sysfs; |
1164 | } | |
f8c6f4e9 JC |
1165 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
1166 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 1167 | |
0f1acee5 MH |
1168 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1169 | indio_dev->setup_ops == NULL) | |
1170 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1171 | ||
f8c6f4e9 JC |
1172 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1173 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1174 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1175 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1176 | if (ret < 0) |
0d5b7dae | 1177 | goto error_unreg_eventset; |
847ec80b | 1178 | |
0d5b7dae LPC |
1179 | ret = device_add(&indio_dev->dev); |
1180 | if (ret < 0) | |
1181 | goto error_cdev_del; | |
1182 | ||
1183 | return 0; | |
1184 | error_cdev_del: | |
1185 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1186 | error_unreg_eventset: |
f8c6f4e9 | 1187 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1188 | error_free_sysfs: |
f8c6f4e9 | 1189 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
1190 | error_unreg_debugfs: |
1191 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1192 | return ret; |
1193 | } | |
1194 | EXPORT_SYMBOL(iio_device_register); | |
1195 | ||
a7e57dce SK |
1196 | /** |
1197 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1198 | * @indio_dev: Device structure representing the device. | |
1199 | **/ | |
f8c6f4e9 | 1200 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1201 | { |
ac917a81 | 1202 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1203 | |
1204 | device_del(&indio_dev->dev); | |
1205 | ||
0d5b7dae LPC |
1206 | if (indio_dev->chrdev.dev) |
1207 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1208 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1209 | |
a87c82e4 LPC |
1210 | iio_disable_all_buffers(indio_dev); |
1211 | ||
ac917a81 | 1212 | indio_dev->info = NULL; |
d2f0a48f LPC |
1213 | |
1214 | iio_device_wakeup_eventset(indio_dev); | |
1215 | iio_buffer_wakeup_poll(indio_dev); | |
1216 | ||
ac917a81 | 1217 | mutex_unlock(&indio_dev->info_exist_lock); |
847ec80b JC |
1218 | } |
1219 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1220 | |
1221 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1222 | { | |
1223 | iio_device_unregister(*(struct iio_dev **)res); | |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1228 | * @dev: Device to allocate iio_dev for | |
1229 | * @indio_dev: Device structure filled by the device driver | |
1230 | * | |
1231 | * Managed iio_device_register. The IIO device registered with this | |
1232 | * function is automatically unregistered on driver detach. This function | |
1233 | * calls iio_device_register() internally. Refer to that function for more | |
1234 | * information. | |
1235 | * | |
1236 | * If an iio_dev registered with this function needs to be unregistered | |
1237 | * separately, devm_iio_device_unregister() must be used. | |
1238 | * | |
1239 | * RETURNS: | |
1240 | * 0 on success, negative error number on failure. | |
1241 | */ | |
1242 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1243 | { | |
1244 | struct iio_dev **ptr; | |
1245 | int ret; | |
1246 | ||
1247 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1248 | if (!ptr) | |
1249 | return -ENOMEM; | |
1250 | ||
1251 | *ptr = indio_dev; | |
1252 | ret = iio_device_register(indio_dev); | |
1253 | if (!ret) | |
1254 | devres_add(dev, ptr); | |
1255 | else | |
1256 | devres_free(ptr); | |
1257 | ||
1258 | return ret; | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1261 | ||
1262 | /** | |
1263 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1264 | * @dev: Device this iio_dev belongs to | |
1265 | * @indio_dev: the iio_dev associated with the device | |
1266 | * | |
1267 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1268 | */ | |
1269 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1270 | { | |
1271 | int rc; | |
1272 | ||
1273 | rc = devres_release(dev, devm_iio_device_unreg, | |
1274 | devm_iio_device_match, indio_dev); | |
1275 | WARN_ON(rc); | |
1276 | } | |
1277 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1278 | ||
847ec80b JC |
1279 | subsys_initcall(iio_init); |
1280 | module_exit(iio_exit); | |
1281 | ||
c8b95952 | 1282 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1283 | MODULE_DESCRIPTION("Industrial I/O core"); |
1284 | MODULE_LICENSE("GPL"); |