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Commit | Line | Data |
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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", |
1d892719 JC |
88 | }; |
89 | ||
90 | /* relies on pairs of these shared then separate */ | |
91 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
92 | [IIO_CHAN_INFO_RAW] = "raw", |
93 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
94 | [IIO_CHAN_INFO_SCALE] = "scale", |
95 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
96 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
97 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
98 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
99 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
100 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
101 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
102 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
103 | = "filter_low_pass_3db_frequency", | |
ce85a1cb | 104 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
105 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
106 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 107 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 108 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 109 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
1d892719 JC |
110 | }; |
111 | ||
a7e57dce SK |
112 | /** |
113 | * iio_find_channel_from_si() - get channel from its scan index | |
114 | * @indio_dev: device | |
115 | * @si: scan index to match | |
116 | */ | |
5fb21c82 JC |
117 | const struct iio_chan_spec |
118 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
119 | { | |
120 | int i; | |
121 | ||
122 | for (i = 0; i < indio_dev->num_channels; i++) | |
123 | if (indio_dev->channels[i].scan_index == si) | |
124 | return &indio_dev->channels[i]; | |
125 | return NULL; | |
126 | } | |
127 | ||
847ec80b JC |
128 | /* This turns up an awful lot */ |
129 | ssize_t iio_read_const_attr(struct device *dev, | |
130 | struct device_attribute *attr, | |
131 | char *buf) | |
132 | { | |
133 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
134 | } | |
135 | EXPORT_SYMBOL(iio_read_const_attr); | |
136 | ||
847ec80b JC |
137 | static int __init iio_init(void) |
138 | { | |
139 | int ret; | |
140 | ||
5aaaeba8 JC |
141 | /* Register sysfs bus */ |
142 | ret = bus_register(&iio_bus_type); | |
847ec80b | 143 | if (ret < 0) { |
3176dd5d | 144 | pr_err("could not register bus type\n"); |
847ec80b JC |
145 | goto error_nothing; |
146 | } | |
147 | ||
9aa1a167 JC |
148 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
149 | if (ret < 0) { | |
3176dd5d | 150 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 151 | goto error_unregister_bus_type; |
9aa1a167 | 152 | } |
847ec80b | 153 | |
e553f182 MH |
154 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
155 | ||
847ec80b JC |
156 | return 0; |
157 | ||
5aaaeba8 JC |
158 | error_unregister_bus_type: |
159 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
160 | error_nothing: |
161 | return ret; | |
162 | } | |
163 | ||
164 | static void __exit iio_exit(void) | |
165 | { | |
9aa1a167 JC |
166 | if (iio_devt) |
167 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 168 | bus_unregister(&iio_bus_type); |
e553f182 MH |
169 | debugfs_remove(iio_debugfs_dentry); |
170 | } | |
171 | ||
172 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
173 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
174 | size_t count, loff_t *ppos) | |
175 | { | |
176 | struct iio_dev *indio_dev = file->private_data; | |
177 | char buf[20]; | |
178 | unsigned val = 0; | |
179 | ssize_t len; | |
180 | int ret; | |
181 | ||
182 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
183 | indio_dev->cached_reg_addr, | |
184 | 0, &val); | |
185 | if (ret) | |
186 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
187 | ||
188 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
189 | ||
190 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
191 | } | |
192 | ||
193 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
194 | const char __user *userbuf, size_t count, loff_t *ppos) | |
195 | { | |
196 | struct iio_dev *indio_dev = file->private_data; | |
197 | unsigned reg, val; | |
198 | char buf[80]; | |
199 | int ret; | |
200 | ||
201 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
202 | if (copy_from_user(buf, userbuf, count)) | |
203 | return -EFAULT; | |
204 | ||
205 | buf[count] = 0; | |
206 | ||
207 | ret = sscanf(buf, "%i %i", ®, &val); | |
208 | ||
209 | switch (ret) { | |
210 | case 1: | |
211 | indio_dev->cached_reg_addr = reg; | |
212 | break; | |
213 | case 2: | |
214 | indio_dev->cached_reg_addr = reg; | |
215 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
216 | val, NULL); | |
217 | if (ret) { | |
218 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
219 | __func__); | |
220 | return ret; | |
221 | } | |
222 | break; | |
223 | default: | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
227 | return count; | |
228 | } | |
229 | ||
230 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 231 | .open = simple_open, |
e553f182 MH |
232 | .read = iio_debugfs_read_reg, |
233 | .write = iio_debugfs_write_reg, | |
234 | }; | |
235 | ||
236 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
237 | { | |
238 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
239 | } |
240 | ||
e553f182 MH |
241 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
242 | { | |
243 | struct dentry *d; | |
244 | ||
245 | if (indio_dev->info->debugfs_reg_access == NULL) | |
246 | return 0; | |
247 | ||
abd5a2fb | 248 | if (!iio_debugfs_dentry) |
e553f182 MH |
249 | return 0; |
250 | ||
251 | indio_dev->debugfs_dentry = | |
252 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
253 | iio_debugfs_dentry); | |
e553f182 MH |
254 | if (indio_dev->debugfs_dentry == NULL) { |
255 | dev_warn(indio_dev->dev.parent, | |
256 | "Failed to create debugfs directory\n"); | |
257 | return -EFAULT; | |
258 | } | |
259 | ||
260 | d = debugfs_create_file("direct_reg_access", 0644, | |
261 | indio_dev->debugfs_dentry, | |
262 | indio_dev, &iio_debugfs_reg_fops); | |
263 | if (!d) { | |
264 | iio_device_unregister_debugfs(indio_dev); | |
265 | return -ENOMEM; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | #else | |
271 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
272 | { | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
277 | { | |
278 | } | |
279 | #endif /* CONFIG_DEBUG_FS */ | |
280 | ||
4fee7e16 LPC |
281 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
282 | struct device_attribute *attr, | |
283 | char *buf) | |
284 | { | |
e53f5ac5 | 285 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
286 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
287 | const struct iio_chan_spec_ext_info *ext_info; | |
288 | ||
289 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
290 | ||
fc6d1139 | 291 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
292 | } |
293 | ||
294 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
295 | struct device_attribute *attr, | |
296 | const char *buf, | |
297 | size_t len) | |
298 | { | |
e53f5ac5 | 299 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
300 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
301 | const struct iio_chan_spec_ext_info *ext_info; | |
302 | ||
303 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
304 | ||
fc6d1139 MH |
305 | return ext_info->write(indio_dev, ext_info->private, |
306 | this_attr->c, buf, len); | |
4fee7e16 LPC |
307 | } |
308 | ||
5212cc8a LPC |
309 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
310 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
311 | { | |
312 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
313 | unsigned int i; | |
314 | size_t len = 0; | |
315 | ||
316 | if (!e->num_items) | |
317 | return 0; | |
318 | ||
319 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 320 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
321 | |
322 | /* replace last space with a newline */ | |
323 | buf[len - 1] = '\n'; | |
324 | ||
325 | return len; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
328 | ||
329 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
330 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
331 | { | |
332 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
333 | int i; | |
334 | ||
335 | if (!e->get) | |
336 | return -EINVAL; | |
337 | ||
338 | i = e->get(indio_dev, chan); | |
339 | if (i < 0) | |
340 | return i; | |
341 | else if (i >= e->num_items) | |
342 | return -EINVAL; | |
343 | ||
598db581 | 344 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
345 | } |
346 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
347 | ||
348 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
349 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
350 | size_t len) | |
351 | { | |
352 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
353 | unsigned int i; | |
354 | int ret; | |
355 | ||
356 | if (!e->set) | |
357 | return -EINVAL; | |
358 | ||
359 | for (i = 0; i < e->num_items; i++) { | |
360 | if (sysfs_streq(buf, e->items[i])) | |
361 | break; | |
362 | } | |
363 | ||
364 | if (i == e->num_items) | |
365 | return -EINVAL; | |
366 | ||
367 | ret = e->set(indio_dev, chan, i); | |
368 | return ret ? ret : len; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
371 | ||
3661f3f5 LPC |
372 | /** |
373 | * iio_format_value() - Formats a IIO value into its string representation | |
374 | * @buf: The buffer to which the formated value gets written | |
375 | * @type: One of the IIO_VAL_... constants. This decides how the val and val2 | |
376 | * parameters are formatted. | |
9fbfb4b3 | 377 | * @vals: pointer to the values, exact meaning depends on the type parameter. |
3661f3f5 | 378 | */ |
9fbfb4b3 | 379 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
847ec80b | 380 | { |
7985e7c1 | 381 | unsigned long long tmp; |
67eedba3 | 382 | bool scale_db = false; |
1d892719 | 383 | |
3661f3f5 | 384 | switch (type) { |
67eedba3 | 385 | case IIO_VAL_INT: |
9fbfb4b3 | 386 | return sprintf(buf, "%d\n", vals[0]); |
67eedba3 MH |
387 | case IIO_VAL_INT_PLUS_MICRO_DB: |
388 | scale_db = true; | |
389 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 SP |
390 | if (vals[1] < 0) |
391 | return sprintf(buf, "-%ld.%06u%s\n", abs(vals[0]), | |
392 | -vals[1], | |
67eedba3 | 393 | scale_db ? " dB" : ""); |
1d892719 | 394 | else |
9fbfb4b3 | 395 | return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
67eedba3 MH |
396 | scale_db ? " dB" : ""); |
397 | case IIO_VAL_INT_PLUS_NANO: | |
9fbfb4b3 SP |
398 | if (vals[1] < 0) |
399 | return sprintf(buf, "-%ld.%09u\n", abs(vals[0]), | |
400 | -vals[1]); | |
71646e2c | 401 | else |
9fbfb4b3 | 402 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
7985e7c1 | 403 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 SP |
404 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
405 | vals[1] = do_div(tmp, 1000000000LL); | |
406 | vals[0] = tmp; | |
407 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
103d9fb9 | 408 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 SP |
409 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
410 | vals[1] = do_div(tmp, 1000000000LL); | |
411 | vals[0] = tmp; | |
412 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
413 | case IIO_VAL_INT_MULTIPLE: | |
414 | { | |
415 | int i; | |
416 | int len = 0; | |
417 | ||
418 | for (i = 0; i < size; ++i) | |
419 | len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", | |
420 | vals[i]); | |
421 | len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); | |
422 | return len; | |
423 | } | |
67eedba3 | 424 | default: |
1d892719 | 425 | return 0; |
67eedba3 | 426 | } |
1d892719 JC |
427 | } |
428 | ||
3661f3f5 LPC |
429 | static ssize_t iio_read_channel_info(struct device *dev, |
430 | struct device_attribute *attr, | |
431 | char *buf) | |
432 | { | |
433 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
434 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
435 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
436 | int ret; | |
437 | int val_len = 2; | |
438 | ||
439 | if (indio_dev->info->read_raw_multi) | |
440 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
441 | INDIO_MAX_RAW_ELEMENTS, | |
442 | vals, &val_len, | |
443 | this_attr->address); | |
444 | else | |
445 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
446 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
447 | |
448 | if (ret < 0) | |
449 | return ret; | |
450 | ||
9fbfb4b3 | 451 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
452 | } |
453 | ||
6807d721 LPC |
454 | /** |
455 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
456 | * @str: The string to parse | |
457 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
458 | * @integer: The integer part of the number | |
459 | * @fract: The fractional part of the number | |
460 | * | |
461 | * Returns 0 on success, or a negative error code if the string could not be | |
462 | * parsed. | |
463 | */ | |
464 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
465 | int *integer, int *fract) | |
466 | { | |
467 | int i = 0, f = 0; | |
468 | bool integer_part = true, negative = false; | |
469 | ||
470 | if (str[0] == '-') { | |
471 | negative = true; | |
472 | str++; | |
473 | } else if (str[0] == '+') { | |
474 | str++; | |
475 | } | |
476 | ||
477 | while (*str) { | |
478 | if ('0' <= *str && *str <= '9') { | |
479 | if (integer_part) { | |
480 | i = i * 10 + *str - '0'; | |
481 | } else { | |
482 | f += fract_mult * (*str - '0'); | |
483 | fract_mult /= 10; | |
484 | } | |
485 | } else if (*str == '\n') { | |
486 | if (*(str + 1) == '\0') | |
487 | break; | |
488 | else | |
489 | return -EINVAL; | |
490 | } else if (*str == '.' && integer_part) { | |
491 | integer_part = false; | |
492 | } else { | |
493 | return -EINVAL; | |
494 | } | |
495 | str++; | |
496 | } | |
497 | ||
498 | if (negative) { | |
499 | if (i) | |
500 | i = -i; | |
501 | else | |
502 | f = -f; | |
503 | } | |
504 | ||
505 | *integer = i; | |
506 | *fract = f; | |
507 | ||
508 | return 0; | |
509 | } | |
510 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
511 | ||
1d892719 JC |
512 | static ssize_t iio_write_channel_info(struct device *dev, |
513 | struct device_attribute *attr, | |
514 | const char *buf, | |
515 | size_t len) | |
516 | { | |
e53f5ac5 | 517 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 518 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
519 | int ret, fract_mult = 100000; |
520 | int integer, fract; | |
1d892719 JC |
521 | |
522 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 523 | if (!indio_dev->info->write_raw) |
1d892719 | 524 | return -EINVAL; |
5c04af04 MH |
525 | |
526 | if (indio_dev->info->write_raw_get_fmt) | |
527 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
528 | this_attr->c, this_attr->address)) { | |
529 | case IIO_VAL_INT_PLUS_MICRO: | |
530 | fract_mult = 100000; | |
531 | break; | |
532 | case IIO_VAL_INT_PLUS_NANO: | |
533 | fract_mult = 100000000; | |
534 | break; | |
535 | default: | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
6807d721 LPC |
539 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
540 | if (ret) | |
541 | return ret; | |
1d892719 | 542 | |
6fe8135f | 543 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 544 | integer, fract, this_attr->address); |
1d892719 JC |
545 | if (ret) |
546 | return ret; | |
547 | ||
548 | return len; | |
549 | } | |
550 | ||
df9c1c42 | 551 | static |
1d892719 JC |
552 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
553 | const char *postfix, | |
554 | struct iio_chan_spec const *chan, | |
555 | ssize_t (*readfunc)(struct device *dev, | |
556 | struct device_attribute *attr, | |
557 | char *buf), | |
558 | ssize_t (*writefunc)(struct device *dev, | |
559 | struct device_attribute *attr, | |
560 | const char *buf, | |
561 | size_t len), | |
3704432f | 562 | enum iio_shared_by shared_by) |
1d892719 | 563 | { |
3704432f | 564 | int ret = 0; |
7bbcf7e1 | 565 | char *name = NULL; |
3704432f | 566 | char *full_postfix; |
1d892719 | 567 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 568 | |
ade7ef7b | 569 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 570 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
571 | if (chan->extend_name) |
572 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
573 | iio_modifier_names[chan | |
574 | ->channel2], | |
575 | chan->extend_name, | |
576 | postfix); | |
577 | else | |
578 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
579 | iio_modifier_names[chan | |
580 | ->channel2], | |
581 | postfix); | |
582 | } else { | |
77bfa8ba | 583 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
584 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
585 | else | |
586 | full_postfix = kasprintf(GFP_KERNEL, | |
587 | "%s_%s", | |
588 | chan->extend_name, | |
589 | postfix); | |
590 | } | |
3704432f JC |
591 | if (full_postfix == NULL) |
592 | return -ENOMEM; | |
1d892719 | 593 | |
4abf6f8b | 594 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 595 | switch (shared_by) { |
c006ec83 | 596 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 597 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
598 | break; |
599 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 600 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
601 | iio_direction[chan->output], |
602 | full_postfix); | |
603 | break; | |
3704432f | 604 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 605 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
606 | iio_direction[chan->output], |
607 | iio_chan_type_name_spec[chan->type], | |
608 | iio_chan_type_name_spec[chan->type], | |
609 | full_postfix); | |
3704432f JC |
610 | break; |
611 | case IIO_SEPARATE: | |
612 | if (!chan->indexed) { | |
613 | WARN_ON("Differential channels must be indexed\n"); | |
614 | ret = -EINVAL; | |
615 | goto error_free_full_postfix; | |
616 | } | |
7bbcf7e1 | 617 | name = kasprintf(GFP_KERNEL, |
3704432f | 618 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
619 | iio_direction[chan->output], |
620 | iio_chan_type_name_spec[chan->type], | |
621 | chan->channel, | |
622 | iio_chan_type_name_spec[chan->type], | |
623 | chan->channel2, | |
624 | full_postfix); | |
3704432f | 625 | break; |
ade7ef7b JC |
626 | } |
627 | } else { /* Single ended */ | |
3704432f | 628 | switch (shared_by) { |
c006ec83 | 629 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 630 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
631 | break; |
632 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 633 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
634 | iio_direction[chan->output], |
635 | full_postfix); | |
636 | break; | |
3704432f | 637 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 638 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
639 | iio_direction[chan->output], |
640 | iio_chan_type_name_spec[chan->type], | |
641 | full_postfix); | |
3704432f JC |
642 | break; |
643 | ||
644 | case IIO_SEPARATE: | |
645 | if (chan->indexed) | |
7bbcf7e1 | 646 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
647 | iio_direction[chan->output], |
648 | iio_chan_type_name_spec[chan->type], | |
649 | chan->channel, | |
650 | full_postfix); | |
651 | else | |
7bbcf7e1 | 652 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
653 | iio_direction[chan->output], |
654 | iio_chan_type_name_spec[chan->type], | |
655 | full_postfix); | |
656 | break; | |
657 | } | |
ade7ef7b | 658 | } |
7bbcf7e1 | 659 | if (name == NULL) { |
1d892719 JC |
660 | ret = -ENOMEM; |
661 | goto error_free_full_postfix; | |
662 | } | |
7bbcf7e1 | 663 | dev_attr->attr.name = name; |
1d892719 JC |
664 | |
665 | if (readfunc) { | |
666 | dev_attr->attr.mode |= S_IRUGO; | |
667 | dev_attr->show = readfunc; | |
668 | } | |
669 | ||
670 | if (writefunc) { | |
671 | dev_attr->attr.mode |= S_IWUSR; | |
672 | dev_attr->store = writefunc; | |
673 | } | |
7bbcf7e1 | 674 | |
1d892719 JC |
675 | error_free_full_postfix: |
676 | kfree(full_postfix); | |
3704432f | 677 | |
1d892719 JC |
678 | return ret; |
679 | } | |
680 | ||
df9c1c42 | 681 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
682 | { |
683 | kfree(dev_attr->attr.name); | |
684 | } | |
685 | ||
686 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
687 | struct iio_chan_spec const *chan, |
688 | ssize_t (*readfunc)(struct device *dev, | |
689 | struct device_attribute *attr, | |
690 | char *buf), | |
691 | ssize_t (*writefunc)(struct device *dev, | |
692 | struct device_attribute *attr, | |
693 | const char *buf, | |
694 | size_t len), | |
e614a54b | 695 | u64 mask, |
3704432f | 696 | enum iio_shared_by shared_by, |
1d892719 JC |
697 | struct device *dev, |
698 | struct list_head *attr_list) | |
699 | { | |
700 | int ret; | |
701 | struct iio_dev_attr *iio_attr, *t; | |
702 | ||
670c1103 | 703 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
704 | if (iio_attr == NULL) |
705 | return -ENOMEM; | |
1d892719 JC |
706 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
707 | postfix, chan, | |
3704432f | 708 | readfunc, writefunc, shared_by); |
1d892719 JC |
709 | if (ret) |
710 | goto error_iio_dev_attr_free; | |
711 | iio_attr->c = chan; | |
712 | iio_attr->address = mask; | |
713 | list_for_each_entry(t, attr_list, l) | |
714 | if (strcmp(t->dev_attr.attr.name, | |
715 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 716 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
717 | dev_err(dev, "tried to double register : %s\n", |
718 | t->dev_attr.attr.name); | |
719 | ret = -EBUSY; | |
720 | goto error_device_attr_deinit; | |
721 | } | |
1d892719 JC |
722 | list_add(&iio_attr->l, attr_list); |
723 | ||
724 | return 0; | |
725 | ||
726 | error_device_attr_deinit: | |
727 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
728 | error_iio_dev_attr_free: | |
729 | kfree(iio_attr); | |
1d892719 JC |
730 | return ret; |
731 | } | |
732 | ||
3704432f JC |
733 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
734 | struct iio_chan_spec const *chan, | |
735 | enum iio_shared_by shared_by, | |
736 | const long *infomask) | |
1d892719 | 737 | { |
3704432f | 738 | int i, ret, attrcount = 0; |
1d892719 | 739 | |
3704432f | 740 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
741 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
742 | return -EINVAL; | |
8655cc49 JC |
743 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
744 | chan, | |
745 | &iio_read_channel_info, | |
746 | &iio_write_channel_info, | |
747 | i, | |
3704432f | 748 | shared_by, |
8655cc49 JC |
749 | &indio_dev->dev, |
750 | &indio_dev->channel_attr_list); | |
3704432f | 751 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 752 | continue; |
3704432f JC |
753 | else if (ret < 0) |
754 | return ret; | |
8655cc49 JC |
755 | attrcount++; |
756 | } | |
5f420b42 | 757 | |
3704432f JC |
758 | return attrcount; |
759 | } | |
760 | ||
761 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, | |
762 | struct iio_chan_spec const *chan) | |
763 | { | |
764 | int ret, attrcount = 0; | |
765 | const struct iio_chan_spec_ext_info *ext_info; | |
766 | ||
767 | if (chan->channel < 0) | |
768 | return 0; | |
769 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
770 | IIO_SEPARATE, | |
771 | &chan->info_mask_separate); | |
772 | if (ret < 0) | |
773 | return ret; | |
774 | attrcount += ret; | |
775 | ||
776 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
777 | IIO_SHARED_BY_TYPE, | |
778 | &chan->info_mask_shared_by_type); | |
779 | if (ret < 0) | |
780 | return ret; | |
781 | attrcount += ret; | |
782 | ||
c006ec83 JC |
783 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
784 | IIO_SHARED_BY_DIR, | |
785 | &chan->info_mask_shared_by_dir); | |
786 | if (ret < 0) | |
787 | return ret; | |
788 | attrcount += ret; | |
789 | ||
790 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
791 | IIO_SHARED_BY_ALL, | |
792 | &chan->info_mask_shared_by_all); | |
793 | if (ret < 0) | |
794 | return ret; | |
795 | attrcount += ret; | |
796 | ||
5f420b42 LPC |
797 | if (chan->ext_info) { |
798 | unsigned int i = 0; | |
799 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
800 | ret = __iio_add_chan_devattr(ext_info->name, | |
801 | chan, | |
802 | ext_info->read ? | |
803 | &iio_read_channel_ext_info : NULL, | |
804 | ext_info->write ? | |
805 | &iio_write_channel_ext_info : NULL, | |
806 | i, | |
807 | ext_info->shared, | |
808 | &indio_dev->dev, | |
809 | &indio_dev->channel_attr_list); | |
810 | i++; | |
811 | if (ret == -EBUSY && ext_info->shared) | |
812 | continue; | |
813 | ||
814 | if (ret) | |
3704432f | 815 | return ret; |
5f420b42 LPC |
816 | |
817 | attrcount++; | |
818 | } | |
819 | } | |
820 | ||
3704432f | 821 | return attrcount; |
1d892719 JC |
822 | } |
823 | ||
84088ebd LPC |
824 | /** |
825 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
826 | * @attr_list: List of IIO device attributes | |
827 | * | |
828 | * This function frees the memory allocated for each of the IIO device | |
829 | * attributes in the list. Note: if you want to reuse the list after calling | |
830 | * this function you have to reinitialize it using INIT_LIST_HEAD(). | |
831 | */ | |
832 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 833 | { |
84088ebd LPC |
834 | struct iio_dev_attr *p, *n; |
835 | ||
836 | list_for_each_entry_safe(p, n, attr_list, l) { | |
837 | kfree(p->dev_attr.attr.name); | |
838 | kfree(p); | |
839 | } | |
1d892719 JC |
840 | } |
841 | ||
1b732888 JC |
842 | static ssize_t iio_show_dev_name(struct device *dev, |
843 | struct device_attribute *attr, | |
844 | char *buf) | |
845 | { | |
e53f5ac5 | 846 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 847 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
848 | } |
849 | ||
850 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
851 | ||
f8c6f4e9 | 852 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 853 | { |
26d25ae3 | 854 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 855 | struct iio_dev_attr *p; |
26d25ae3 | 856 | struct attribute **attr; |
1d892719 | 857 | |
26d25ae3 | 858 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
859 | if (indio_dev->info->attrs) { |
860 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
861 | while (*attr++ != NULL) |
862 | attrcount_orig++; | |
847ec80b | 863 | } |
26d25ae3 | 864 | attrcount = attrcount_orig; |
1d892719 JC |
865 | /* |
866 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 867 | * not need to be initialized if its name is NULL. |
1d892719 | 868 | */ |
f8c6f4e9 JC |
869 | if (indio_dev->channels) |
870 | for (i = 0; i < indio_dev->num_channels; i++) { | |
871 | ret = iio_device_add_channel_sysfs(indio_dev, | |
872 | &indio_dev | |
1d892719 JC |
873 | ->channels[i]); |
874 | if (ret < 0) | |
875 | goto error_clear_attrs; | |
26d25ae3 | 876 | attrcount += ret; |
1d892719 | 877 | } |
26d25ae3 | 878 | |
f8c6f4e9 | 879 | if (indio_dev->name) |
26d25ae3 JC |
880 | attrcount++; |
881 | ||
d83fb184 TM |
882 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
883 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
884 | GFP_KERNEL); | |
f8c6f4e9 | 885 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
886 | ret = -ENOMEM; |
887 | goto error_clear_attrs; | |
1b732888 | 888 | } |
26d25ae3 | 889 | /* Copy across original attributes */ |
f8c6f4e9 JC |
890 | if (indio_dev->info->attrs) |
891 | memcpy(indio_dev->chan_attr_group.attrs, | |
892 | indio_dev->info->attrs->attrs, | |
893 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
894 | *attrcount_orig); |
895 | attrn = attrcount_orig; | |
896 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
897 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
898 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
899 | if (indio_dev->name) | |
900 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 901 | |
f8c6f4e9 JC |
902 | indio_dev->groups[indio_dev->groupcounter++] = |
903 | &indio_dev->chan_attr_group; | |
26d25ae3 | 904 | |
1d892719 | 905 | return 0; |
1b732888 | 906 | |
1d892719 | 907 | error_clear_attrs: |
84088ebd | 908 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 909 | |
26d25ae3 | 910 | return ret; |
847ec80b JC |
911 | } |
912 | ||
f8c6f4e9 | 913 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 914 | { |
1d892719 | 915 | |
84088ebd | 916 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 917 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
918 | } |
919 | ||
847ec80b JC |
920 | static void iio_dev_release(struct device *device) |
921 | { | |
e53f5ac5 | 922 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
f8c6f4e9 JC |
923 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
924 | iio_device_unregister_trigger_consumer(indio_dev); | |
925 | iio_device_unregister_eventset(indio_dev); | |
926 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 927 | |
9e69c935 LPC |
928 | iio_buffer_put(indio_dev->buffer); |
929 | ||
e407fd65 LPC |
930 | ida_simple_remove(&iio_ida, indio_dev->id); |
931 | kfree(indio_dev); | |
847ec80b JC |
932 | } |
933 | ||
17d82b47 | 934 | struct device_type iio_device_type = { |
847ec80b JC |
935 | .name = "iio_device", |
936 | .release = iio_dev_release, | |
937 | }; | |
938 | ||
a7e57dce SK |
939 | /** |
940 | * iio_device_alloc() - allocate an iio_dev from a driver | |
941 | * @sizeof_priv: Space to allocate for private structure. | |
942 | **/ | |
7cbb7537 | 943 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 944 | { |
6f7c8ee5 JC |
945 | struct iio_dev *dev; |
946 | size_t alloc_size; | |
947 | ||
948 | alloc_size = sizeof(struct iio_dev); | |
949 | if (sizeof_priv) { | |
950 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
951 | alloc_size += sizeof_priv; | |
952 | } | |
953 | /* ensure 32-byte alignment of whole construct ? */ | |
954 | alloc_size += IIO_ALIGN - 1; | |
955 | ||
956 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
957 | |
958 | if (dev) { | |
26d25ae3 | 959 | dev->dev.groups = dev->groups; |
17d82b47 | 960 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 961 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
962 | device_initialize(&dev->dev); |
963 | dev_set_drvdata(&dev->dev, (void *)dev); | |
964 | mutex_init(&dev->mlock); | |
ac917a81 | 965 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 966 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
967 | |
968 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
969 | if (dev->id < 0) { | |
970 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 971 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
972 | kfree(dev); |
973 | return NULL; | |
974 | } | |
975 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 976 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
977 | } |
978 | ||
979 | return dev; | |
980 | } | |
7cbb7537 | 981 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 982 | |
a7e57dce SK |
983 | /** |
984 | * iio_device_free() - free an iio_dev from a driver | |
985 | * @dev: the iio_dev associated with the device | |
986 | **/ | |
7cbb7537 | 987 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 988 | { |
e407fd65 LPC |
989 | if (dev) |
990 | put_device(&dev->dev); | |
847ec80b | 991 | } |
7cbb7537 | 992 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 993 | |
9dabaf5e GS |
994 | static void devm_iio_device_release(struct device *dev, void *res) |
995 | { | |
996 | iio_device_free(*(struct iio_dev **)res); | |
997 | } | |
998 | ||
999 | static int devm_iio_device_match(struct device *dev, void *res, void *data) | |
1000 | { | |
1001 | struct iio_dev **r = res; | |
1002 | if (!r || !*r) { | |
1003 | WARN_ON(!r || !*r); | |
1004 | return 0; | |
1005 | } | |
1006 | return *r == data; | |
1007 | } | |
1008 | ||
a7e57dce SK |
1009 | /** |
1010 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1011 | * @dev: Device to allocate iio_dev for | |
1012 | * @sizeof_priv: Space to allocate for private structure. | |
1013 | * | |
1014 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1015 | * automatically freed on driver detach. | |
1016 | * | |
1017 | * If an iio_dev allocated with this function needs to be freed separately, | |
1018 | * devm_iio_device_free() must be used. | |
1019 | * | |
1020 | * RETURNS: | |
1021 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1022 | */ | |
9dabaf5e GS |
1023 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1024 | { | |
1025 | struct iio_dev **ptr, *iio_dev; | |
1026 | ||
1027 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1028 | GFP_KERNEL); | |
1029 | if (!ptr) | |
1030 | return NULL; | |
1031 | ||
1032 | /* use raw alloc_dr for kmalloc caller tracing */ | |
1033 | iio_dev = iio_device_alloc(sizeof_priv); | |
1034 | if (iio_dev) { | |
1035 | *ptr = iio_dev; | |
1036 | devres_add(dev, ptr); | |
1037 | } else { | |
1038 | devres_free(ptr); | |
1039 | } | |
1040 | ||
1041 | return iio_dev; | |
1042 | } | |
1043 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1044 | ||
a7e57dce SK |
1045 | /** |
1046 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1047 | * @dev: Device this iio_dev belongs to | |
1048 | * @iio_dev: the iio_dev associated with the device | |
1049 | * | |
1050 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1051 | */ | |
9dabaf5e GS |
1052 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1053 | { | |
1054 | int rc; | |
1055 | ||
1056 | rc = devres_release(dev, devm_iio_device_release, | |
1057 | devm_iio_device_match, iio_dev); | |
1058 | WARN_ON(rc); | |
1059 | } | |
1060 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1061 | ||
1aa04278 | 1062 | /** |
14555b14 | 1063 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
1064 | **/ |
1065 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1066 | { | |
f8c6f4e9 | 1067 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1068 | struct iio_dev, chrdev); |
bb01443e LPC |
1069 | |
1070 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1071 | return -EBUSY; | |
1072 | ||
cadc2125 LPC |
1073 | iio_device_get(indio_dev); |
1074 | ||
f8c6f4e9 | 1075 | filp->private_data = indio_dev; |
30eb82f0 | 1076 | |
79335140 | 1077 | return 0; |
1aa04278 JC |
1078 | } |
1079 | ||
1080 | /** | |
14555b14 | 1081 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
1082 | **/ |
1083 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
1084 | { | |
bb01443e LPC |
1085 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1086 | struct iio_dev, chrdev); | |
bb01443e | 1087 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1088 | iio_device_put(indio_dev); |
1089 | ||
1aa04278 JC |
1090 | return 0; |
1091 | } | |
1092 | ||
1093 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1094 | * event related */ | |
1095 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1096 | { | |
1097 | struct iio_dev *indio_dev = filp->private_data; | |
1098 | int __user *ip = (int __user *)arg; | |
1099 | int fd; | |
1100 | ||
f18e7a06 LPC |
1101 | if (!indio_dev->info) |
1102 | return -ENODEV; | |
1103 | ||
1aa04278 JC |
1104 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1105 | fd = iio_event_getfd(indio_dev); | |
1106 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
1107 | return -EFAULT; | |
1108 | return 0; | |
1109 | } | |
1110 | return -EINVAL; | |
1111 | } | |
1112 | ||
14555b14 JC |
1113 | static const struct file_operations iio_buffer_fileops = { |
1114 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1115 | .release = iio_chrdev_release, |
1116 | .open = iio_chrdev_open, | |
14555b14 | 1117 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1118 | .owner = THIS_MODULE, |
1119 | .llseek = noop_llseek, | |
1120 | .unlocked_ioctl = iio_ioctl, | |
1121 | .compat_ioctl = iio_ioctl, | |
1122 | }; | |
1123 | ||
0f1acee5 MH |
1124 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1125 | ||
a7e57dce SK |
1126 | /** |
1127 | * iio_device_register() - register a device with the IIO subsystem | |
1128 | * @indio_dev: Device structure filled by the device driver | |
1129 | **/ | |
f8c6f4e9 | 1130 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1131 | { |
1132 | int ret; | |
1133 | ||
17d82b47 GR |
1134 | /* If the calling driver did not initialize of_node, do it here */ |
1135 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1136 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1137 | ||
1aa04278 | 1138 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1139 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1140 | |
e553f182 MH |
1141 | ret = iio_device_register_debugfs(indio_dev); |
1142 | if (ret) { | |
1143 | dev_err(indio_dev->dev.parent, | |
1144 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1145 | return ret; |
e553f182 | 1146 | } |
f8c6f4e9 | 1147 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1148 | if (ret) { |
f8c6f4e9 | 1149 | dev_err(indio_dev->dev.parent, |
847ec80b | 1150 | "Failed to register sysfs interfaces\n"); |
e553f182 | 1151 | goto error_unreg_debugfs; |
847ec80b | 1152 | } |
f8c6f4e9 | 1153 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1154 | if (ret) { |
f8c6f4e9 | 1155 | dev_err(indio_dev->dev.parent, |
c849d253 | 1156 | "Failed to register event set\n"); |
847ec80b JC |
1157 | goto error_free_sysfs; |
1158 | } | |
f8c6f4e9 JC |
1159 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
1160 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 1161 | |
0f1acee5 MH |
1162 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1163 | indio_dev->setup_ops == NULL) | |
1164 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1165 | ||
f8c6f4e9 JC |
1166 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1167 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1168 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1169 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1170 | if (ret < 0) |
0d5b7dae | 1171 | goto error_unreg_eventset; |
847ec80b | 1172 | |
0d5b7dae LPC |
1173 | ret = device_add(&indio_dev->dev); |
1174 | if (ret < 0) | |
1175 | goto error_cdev_del; | |
1176 | ||
1177 | return 0; | |
1178 | error_cdev_del: | |
1179 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1180 | error_unreg_eventset: |
f8c6f4e9 | 1181 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1182 | error_free_sysfs: |
f8c6f4e9 | 1183 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
1184 | error_unreg_debugfs: |
1185 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1186 | return ret; |
1187 | } | |
1188 | EXPORT_SYMBOL(iio_device_register); | |
1189 | ||
a7e57dce SK |
1190 | /** |
1191 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1192 | * @indio_dev: Device structure representing the device. | |
1193 | **/ | |
f8c6f4e9 | 1194 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1195 | { |
ac917a81 | 1196 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1197 | |
1198 | device_del(&indio_dev->dev); | |
1199 | ||
0d5b7dae LPC |
1200 | if (indio_dev->chrdev.dev) |
1201 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1202 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1203 | |
a87c82e4 LPC |
1204 | iio_disable_all_buffers(indio_dev); |
1205 | ||
ac917a81 | 1206 | indio_dev->info = NULL; |
d2f0a48f LPC |
1207 | |
1208 | iio_device_wakeup_eventset(indio_dev); | |
1209 | iio_buffer_wakeup_poll(indio_dev); | |
1210 | ||
ac917a81 | 1211 | mutex_unlock(&indio_dev->info_exist_lock); |
847ec80b JC |
1212 | } |
1213 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1214 | |
1215 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1216 | { | |
1217 | iio_device_unregister(*(struct iio_dev **)res); | |
1218 | } | |
1219 | ||
1220 | /** | |
1221 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1222 | * @dev: Device to allocate iio_dev for | |
1223 | * @indio_dev: Device structure filled by the device driver | |
1224 | * | |
1225 | * Managed iio_device_register. The IIO device registered with this | |
1226 | * function is automatically unregistered on driver detach. This function | |
1227 | * calls iio_device_register() internally. Refer to that function for more | |
1228 | * information. | |
1229 | * | |
1230 | * If an iio_dev registered with this function needs to be unregistered | |
1231 | * separately, devm_iio_device_unregister() must be used. | |
1232 | * | |
1233 | * RETURNS: | |
1234 | * 0 on success, negative error number on failure. | |
1235 | */ | |
1236 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1237 | { | |
1238 | struct iio_dev **ptr; | |
1239 | int ret; | |
1240 | ||
1241 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1242 | if (!ptr) | |
1243 | return -ENOMEM; | |
1244 | ||
1245 | *ptr = indio_dev; | |
1246 | ret = iio_device_register(indio_dev); | |
1247 | if (!ret) | |
1248 | devres_add(dev, ptr); | |
1249 | else | |
1250 | devres_free(ptr); | |
1251 | ||
1252 | return ret; | |
1253 | } | |
1254 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1255 | ||
1256 | /** | |
1257 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1258 | * @dev: Device this iio_dev belongs to | |
1259 | * @indio_dev: the iio_dev associated with the device | |
1260 | * | |
1261 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1262 | */ | |
1263 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1264 | { | |
1265 | int rc; | |
1266 | ||
1267 | rc = devres_release(dev, devm_iio_device_unreg, | |
1268 | devm_iio_device_match, indio_dev); | |
1269 | WARN_ON(rc); | |
1270 | } | |
1271 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1272 | ||
847ec80b JC |
1273 | subsys_initcall(iio_init); |
1274 | module_exit(iio_exit); | |
1275 | ||
c8b95952 | 1276 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1277 | MODULE_DESCRIPTION("Industrial I/O core"); |
1278 | MODULE_LICENSE("GPL"); |