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", |
55aebeb9 | 73 | [IIO_ACTIVITY] = "activity", |
a88bfe78 | 74 | [IIO_STEPS] = "steps", |
72c66644 | 75 | [IIO_ENERGY] = "energy", |
cc3c9eec | 76 | [IIO_DISTANCE] = "distance", |
5a1a9329 | 77 | [IIO_VELOCITY] = "velocity", |
1d892719 JC |
78 | }; |
79 | ||
330c6c57 | 80 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
81 | [IIO_MOD_X] = "x", |
82 | [IIO_MOD_Y] = "y", | |
83 | [IIO_MOD_Z] = "z", | |
8f5879b2 | 84 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 85 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
86 | [IIO_MOD_LIGHT_BOTH] = "both", |
87 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
88 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
89 | [IIO_MOD_LIGHT_RED] = "red", | |
90 | [IIO_MOD_LIGHT_GREEN] = "green", | |
91 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
5082f405 | 92 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
93 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
94 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
95 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
96 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
97 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
98 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
99 | [IIO_MOD_RUNNING] = "running", |
100 | [IIO_MOD_JOGGING] = "jogging", | |
101 | [IIO_MOD_WALKING] = "walking", | |
102 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 103 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1d892719 JC |
104 | }; |
105 | ||
106 | /* relies on pairs of these shared then separate */ | |
107 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
108 | [IIO_CHAN_INFO_RAW] = "raw", |
109 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
110 | [IIO_CHAN_INFO_SCALE] = "scale", |
111 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
112 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
113 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
114 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
115 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
116 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
117 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
118 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
119 | = "filter_low_pass_3db_frequency", | |
ce85a1cb | 120 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
121 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
122 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 123 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 124 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 125 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 126 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 127 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
1d892719 JC |
128 | }; |
129 | ||
a7e57dce SK |
130 | /** |
131 | * iio_find_channel_from_si() - get channel from its scan index | |
132 | * @indio_dev: device | |
133 | * @si: scan index to match | |
134 | */ | |
5fb21c82 JC |
135 | const struct iio_chan_spec |
136 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
137 | { | |
138 | int i; | |
139 | ||
140 | for (i = 0; i < indio_dev->num_channels; i++) | |
141 | if (indio_dev->channels[i].scan_index == si) | |
142 | return &indio_dev->channels[i]; | |
143 | return NULL; | |
144 | } | |
145 | ||
847ec80b JC |
146 | /* This turns up an awful lot */ |
147 | ssize_t iio_read_const_attr(struct device *dev, | |
148 | struct device_attribute *attr, | |
149 | char *buf) | |
150 | { | |
151 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
152 | } | |
153 | EXPORT_SYMBOL(iio_read_const_attr); | |
154 | ||
847ec80b JC |
155 | static int __init iio_init(void) |
156 | { | |
157 | int ret; | |
158 | ||
5aaaeba8 JC |
159 | /* Register sysfs bus */ |
160 | ret = bus_register(&iio_bus_type); | |
847ec80b | 161 | if (ret < 0) { |
3176dd5d | 162 | pr_err("could not register bus type\n"); |
847ec80b JC |
163 | goto error_nothing; |
164 | } | |
165 | ||
9aa1a167 JC |
166 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
167 | if (ret < 0) { | |
3176dd5d | 168 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 169 | goto error_unregister_bus_type; |
9aa1a167 | 170 | } |
847ec80b | 171 | |
e553f182 MH |
172 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
173 | ||
847ec80b JC |
174 | return 0; |
175 | ||
5aaaeba8 JC |
176 | error_unregister_bus_type: |
177 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
178 | error_nothing: |
179 | return ret; | |
180 | } | |
181 | ||
182 | static void __exit iio_exit(void) | |
183 | { | |
9aa1a167 JC |
184 | if (iio_devt) |
185 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 186 | bus_unregister(&iio_bus_type); |
e553f182 MH |
187 | debugfs_remove(iio_debugfs_dentry); |
188 | } | |
189 | ||
190 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
191 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
192 | size_t count, loff_t *ppos) | |
193 | { | |
194 | struct iio_dev *indio_dev = file->private_data; | |
195 | char buf[20]; | |
196 | unsigned val = 0; | |
197 | ssize_t len; | |
198 | int ret; | |
199 | ||
200 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
201 | indio_dev->cached_reg_addr, | |
202 | 0, &val); | |
203 | if (ret) | |
204 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
205 | ||
206 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
207 | ||
208 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
209 | } | |
210 | ||
211 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
212 | const char __user *userbuf, size_t count, loff_t *ppos) | |
213 | { | |
214 | struct iio_dev *indio_dev = file->private_data; | |
215 | unsigned reg, val; | |
216 | char buf[80]; | |
217 | int ret; | |
218 | ||
219 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
220 | if (copy_from_user(buf, userbuf, count)) | |
221 | return -EFAULT; | |
222 | ||
223 | buf[count] = 0; | |
224 | ||
225 | ret = sscanf(buf, "%i %i", ®, &val); | |
226 | ||
227 | switch (ret) { | |
228 | case 1: | |
229 | indio_dev->cached_reg_addr = reg; | |
230 | break; | |
231 | case 2: | |
232 | indio_dev->cached_reg_addr = reg; | |
233 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
234 | val, NULL); | |
235 | if (ret) { | |
236 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
237 | __func__); | |
238 | return ret; | |
239 | } | |
240 | break; | |
241 | default: | |
242 | return -EINVAL; | |
243 | } | |
244 | ||
245 | return count; | |
246 | } | |
247 | ||
248 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 249 | .open = simple_open, |
e553f182 MH |
250 | .read = iio_debugfs_read_reg, |
251 | .write = iio_debugfs_write_reg, | |
252 | }; | |
253 | ||
254 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
255 | { | |
256 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
257 | } |
258 | ||
e553f182 MH |
259 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
260 | { | |
261 | struct dentry *d; | |
262 | ||
263 | if (indio_dev->info->debugfs_reg_access == NULL) | |
264 | return 0; | |
265 | ||
abd5a2fb | 266 | if (!iio_debugfs_dentry) |
e553f182 MH |
267 | return 0; |
268 | ||
269 | indio_dev->debugfs_dentry = | |
270 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
271 | iio_debugfs_dentry); | |
e553f182 MH |
272 | if (indio_dev->debugfs_dentry == NULL) { |
273 | dev_warn(indio_dev->dev.parent, | |
274 | "Failed to create debugfs directory\n"); | |
275 | return -EFAULT; | |
276 | } | |
277 | ||
278 | d = debugfs_create_file("direct_reg_access", 0644, | |
279 | indio_dev->debugfs_dentry, | |
280 | indio_dev, &iio_debugfs_reg_fops); | |
281 | if (!d) { | |
282 | iio_device_unregister_debugfs(indio_dev); | |
283 | return -ENOMEM; | |
284 | } | |
285 | ||
286 | return 0; | |
287 | } | |
288 | #else | |
289 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
290 | { | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
295 | { | |
296 | } | |
297 | #endif /* CONFIG_DEBUG_FS */ | |
298 | ||
4fee7e16 LPC |
299 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
300 | struct device_attribute *attr, | |
301 | char *buf) | |
302 | { | |
e53f5ac5 | 303 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
304 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
305 | const struct iio_chan_spec_ext_info *ext_info; | |
306 | ||
307 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
308 | ||
fc6d1139 | 309 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
310 | } |
311 | ||
312 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
313 | struct device_attribute *attr, | |
314 | const char *buf, | |
315 | size_t len) | |
316 | { | |
e53f5ac5 | 317 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
318 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
319 | const struct iio_chan_spec_ext_info *ext_info; | |
320 | ||
321 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
322 | ||
fc6d1139 MH |
323 | return ext_info->write(indio_dev, ext_info->private, |
324 | this_attr->c, buf, len); | |
4fee7e16 LPC |
325 | } |
326 | ||
5212cc8a LPC |
327 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
328 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
329 | { | |
330 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
331 | unsigned int i; | |
332 | size_t len = 0; | |
333 | ||
334 | if (!e->num_items) | |
335 | return 0; | |
336 | ||
337 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 338 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
339 | |
340 | /* replace last space with a newline */ | |
341 | buf[len - 1] = '\n'; | |
342 | ||
343 | return len; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
346 | ||
347 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
348 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
349 | { | |
350 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
351 | int i; | |
352 | ||
353 | if (!e->get) | |
354 | return -EINVAL; | |
355 | ||
356 | i = e->get(indio_dev, chan); | |
357 | if (i < 0) | |
358 | return i; | |
359 | else if (i >= e->num_items) | |
360 | return -EINVAL; | |
361 | ||
598db581 | 362 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
363 | } |
364 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
365 | ||
366 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
367 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
368 | size_t len) | |
369 | { | |
370 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
371 | unsigned int i; | |
372 | int ret; | |
373 | ||
374 | if (!e->set) | |
375 | return -EINVAL; | |
376 | ||
377 | for (i = 0; i < e->num_items; i++) { | |
378 | if (sysfs_streq(buf, e->items[i])) | |
379 | break; | |
380 | } | |
381 | ||
382 | if (i == e->num_items) | |
383 | return -EINVAL; | |
384 | ||
385 | ret = e->set(indio_dev, chan, i); | |
386 | return ret ? ret : len; | |
387 | } | |
388 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
389 | ||
3661f3f5 LPC |
390 | /** |
391 | * iio_format_value() - Formats a IIO value into its string representation | |
392 | * @buf: The buffer to which the formated value gets written | |
393 | * @type: One of the IIO_VAL_... constants. This decides how the val and val2 | |
394 | * parameters are formatted. | |
9fbfb4b3 | 395 | * @vals: pointer to the values, exact meaning depends on the type parameter. |
3661f3f5 | 396 | */ |
9fbfb4b3 | 397 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
847ec80b | 398 | { |
7985e7c1 | 399 | unsigned long long tmp; |
67eedba3 | 400 | bool scale_db = false; |
1d892719 | 401 | |
3661f3f5 | 402 | switch (type) { |
67eedba3 | 403 | case IIO_VAL_INT: |
9fbfb4b3 | 404 | return sprintf(buf, "%d\n", vals[0]); |
67eedba3 MH |
405 | case IIO_VAL_INT_PLUS_MICRO_DB: |
406 | scale_db = true; | |
407 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 SP |
408 | if (vals[1] < 0) |
409 | return sprintf(buf, "-%ld.%06u%s\n", abs(vals[0]), | |
410 | -vals[1], | |
67eedba3 | 411 | scale_db ? " dB" : ""); |
1d892719 | 412 | else |
9fbfb4b3 | 413 | return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
67eedba3 MH |
414 | scale_db ? " dB" : ""); |
415 | case IIO_VAL_INT_PLUS_NANO: | |
9fbfb4b3 SP |
416 | if (vals[1] < 0) |
417 | return sprintf(buf, "-%ld.%09u\n", abs(vals[0]), | |
418 | -vals[1]); | |
71646e2c | 419 | else |
9fbfb4b3 | 420 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
7985e7c1 | 421 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 SP |
422 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
423 | vals[1] = do_div(tmp, 1000000000LL); | |
424 | vals[0] = tmp; | |
425 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
103d9fb9 | 426 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 SP |
427 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
428 | vals[1] = do_div(tmp, 1000000000LL); | |
429 | vals[0] = tmp; | |
430 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
431 | case IIO_VAL_INT_MULTIPLE: | |
432 | { | |
433 | int i; | |
434 | int len = 0; | |
435 | ||
436 | for (i = 0; i < size; ++i) | |
437 | len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", | |
438 | vals[i]); | |
439 | len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); | |
440 | return len; | |
441 | } | |
67eedba3 | 442 | default: |
1d892719 | 443 | return 0; |
67eedba3 | 444 | } |
1d892719 JC |
445 | } |
446 | ||
3661f3f5 LPC |
447 | static ssize_t iio_read_channel_info(struct device *dev, |
448 | struct device_attribute *attr, | |
449 | char *buf) | |
450 | { | |
451 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
452 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
453 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
454 | int ret; | |
455 | int val_len = 2; | |
456 | ||
457 | if (indio_dev->info->read_raw_multi) | |
458 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
459 | INDIO_MAX_RAW_ELEMENTS, | |
460 | vals, &val_len, | |
461 | this_attr->address); | |
462 | else | |
463 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
464 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
465 | |
466 | if (ret < 0) | |
467 | return ret; | |
468 | ||
9fbfb4b3 | 469 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
470 | } |
471 | ||
6807d721 LPC |
472 | /** |
473 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
474 | * @str: The string to parse | |
475 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
476 | * @integer: The integer part of the number | |
477 | * @fract: The fractional part of the number | |
478 | * | |
479 | * Returns 0 on success, or a negative error code if the string could not be | |
480 | * parsed. | |
481 | */ | |
482 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
483 | int *integer, int *fract) | |
484 | { | |
485 | int i = 0, f = 0; | |
486 | bool integer_part = true, negative = false; | |
487 | ||
488 | if (str[0] == '-') { | |
489 | negative = true; | |
490 | str++; | |
491 | } else if (str[0] == '+') { | |
492 | str++; | |
493 | } | |
494 | ||
495 | while (*str) { | |
496 | if ('0' <= *str && *str <= '9') { | |
497 | if (integer_part) { | |
498 | i = i * 10 + *str - '0'; | |
499 | } else { | |
500 | f += fract_mult * (*str - '0'); | |
501 | fract_mult /= 10; | |
502 | } | |
503 | } else if (*str == '\n') { | |
504 | if (*(str + 1) == '\0') | |
505 | break; | |
506 | else | |
507 | return -EINVAL; | |
508 | } else if (*str == '.' && integer_part) { | |
509 | integer_part = false; | |
510 | } else { | |
511 | return -EINVAL; | |
512 | } | |
513 | str++; | |
514 | } | |
515 | ||
516 | if (negative) { | |
517 | if (i) | |
518 | i = -i; | |
519 | else | |
520 | f = -f; | |
521 | } | |
522 | ||
523 | *integer = i; | |
524 | *fract = f; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
529 | ||
1d892719 JC |
530 | static ssize_t iio_write_channel_info(struct device *dev, |
531 | struct device_attribute *attr, | |
532 | const char *buf, | |
533 | size_t len) | |
534 | { | |
e53f5ac5 | 535 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 536 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
537 | int ret, fract_mult = 100000; |
538 | int integer, fract; | |
1d892719 JC |
539 | |
540 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 541 | if (!indio_dev->info->write_raw) |
1d892719 | 542 | return -EINVAL; |
5c04af04 MH |
543 | |
544 | if (indio_dev->info->write_raw_get_fmt) | |
545 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
546 | this_attr->c, this_attr->address)) { | |
547 | case IIO_VAL_INT_PLUS_MICRO: | |
548 | fract_mult = 100000; | |
549 | break; | |
550 | case IIO_VAL_INT_PLUS_NANO: | |
551 | fract_mult = 100000000; | |
552 | break; | |
553 | default: | |
554 | return -EINVAL; | |
555 | } | |
556 | ||
6807d721 LPC |
557 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
558 | if (ret) | |
559 | return ret; | |
1d892719 | 560 | |
6fe8135f | 561 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 562 | integer, fract, this_attr->address); |
1d892719 JC |
563 | if (ret) |
564 | return ret; | |
565 | ||
566 | return len; | |
567 | } | |
568 | ||
df9c1c42 | 569 | static |
1d892719 JC |
570 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
571 | const char *postfix, | |
572 | struct iio_chan_spec const *chan, | |
573 | ssize_t (*readfunc)(struct device *dev, | |
574 | struct device_attribute *attr, | |
575 | char *buf), | |
576 | ssize_t (*writefunc)(struct device *dev, | |
577 | struct device_attribute *attr, | |
578 | const char *buf, | |
579 | size_t len), | |
3704432f | 580 | enum iio_shared_by shared_by) |
1d892719 | 581 | { |
3704432f | 582 | int ret = 0; |
7bbcf7e1 | 583 | char *name = NULL; |
3704432f | 584 | char *full_postfix; |
1d892719 | 585 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 586 | |
ade7ef7b | 587 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 588 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
589 | if (chan->extend_name) |
590 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
591 | iio_modifier_names[chan | |
592 | ->channel2], | |
593 | chan->extend_name, | |
594 | postfix); | |
595 | else | |
596 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
597 | iio_modifier_names[chan | |
598 | ->channel2], | |
599 | postfix); | |
600 | } else { | |
77bfa8ba | 601 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
602 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
603 | else | |
604 | full_postfix = kasprintf(GFP_KERNEL, | |
605 | "%s_%s", | |
606 | chan->extend_name, | |
607 | postfix); | |
608 | } | |
3704432f JC |
609 | if (full_postfix == NULL) |
610 | return -ENOMEM; | |
1d892719 | 611 | |
4abf6f8b | 612 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 613 | switch (shared_by) { |
c006ec83 | 614 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 615 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
616 | break; |
617 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 618 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
619 | iio_direction[chan->output], |
620 | full_postfix); | |
621 | break; | |
3704432f | 622 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 623 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
624 | iio_direction[chan->output], |
625 | iio_chan_type_name_spec[chan->type], | |
626 | iio_chan_type_name_spec[chan->type], | |
627 | full_postfix); | |
3704432f JC |
628 | break; |
629 | case IIO_SEPARATE: | |
630 | if (!chan->indexed) { | |
631 | WARN_ON("Differential channels must be indexed\n"); | |
632 | ret = -EINVAL; | |
633 | goto error_free_full_postfix; | |
634 | } | |
7bbcf7e1 | 635 | name = kasprintf(GFP_KERNEL, |
3704432f | 636 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
637 | iio_direction[chan->output], |
638 | iio_chan_type_name_spec[chan->type], | |
639 | chan->channel, | |
640 | iio_chan_type_name_spec[chan->type], | |
641 | chan->channel2, | |
642 | full_postfix); | |
3704432f | 643 | break; |
ade7ef7b JC |
644 | } |
645 | } else { /* Single ended */ | |
3704432f | 646 | switch (shared_by) { |
c006ec83 | 647 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 648 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
649 | break; |
650 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 651 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
652 | iio_direction[chan->output], |
653 | full_postfix); | |
654 | break; | |
3704432f | 655 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 656 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
657 | iio_direction[chan->output], |
658 | iio_chan_type_name_spec[chan->type], | |
659 | full_postfix); | |
3704432f JC |
660 | break; |
661 | ||
662 | case IIO_SEPARATE: | |
663 | if (chan->indexed) | |
7bbcf7e1 | 664 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
665 | iio_direction[chan->output], |
666 | iio_chan_type_name_spec[chan->type], | |
667 | chan->channel, | |
668 | full_postfix); | |
669 | else | |
7bbcf7e1 | 670 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
671 | iio_direction[chan->output], |
672 | iio_chan_type_name_spec[chan->type], | |
673 | full_postfix); | |
674 | break; | |
675 | } | |
ade7ef7b | 676 | } |
7bbcf7e1 | 677 | if (name == NULL) { |
1d892719 JC |
678 | ret = -ENOMEM; |
679 | goto error_free_full_postfix; | |
680 | } | |
7bbcf7e1 | 681 | dev_attr->attr.name = name; |
1d892719 JC |
682 | |
683 | if (readfunc) { | |
684 | dev_attr->attr.mode |= S_IRUGO; | |
685 | dev_attr->show = readfunc; | |
686 | } | |
687 | ||
688 | if (writefunc) { | |
689 | dev_attr->attr.mode |= S_IWUSR; | |
690 | dev_attr->store = writefunc; | |
691 | } | |
7bbcf7e1 | 692 | |
1d892719 JC |
693 | error_free_full_postfix: |
694 | kfree(full_postfix); | |
3704432f | 695 | |
1d892719 JC |
696 | return ret; |
697 | } | |
698 | ||
df9c1c42 | 699 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
700 | { |
701 | kfree(dev_attr->attr.name); | |
702 | } | |
703 | ||
704 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
705 | struct iio_chan_spec const *chan, |
706 | ssize_t (*readfunc)(struct device *dev, | |
707 | struct device_attribute *attr, | |
708 | char *buf), | |
709 | ssize_t (*writefunc)(struct device *dev, | |
710 | struct device_attribute *attr, | |
711 | const char *buf, | |
712 | size_t len), | |
e614a54b | 713 | u64 mask, |
3704432f | 714 | enum iio_shared_by shared_by, |
1d892719 JC |
715 | struct device *dev, |
716 | struct list_head *attr_list) | |
717 | { | |
718 | int ret; | |
719 | struct iio_dev_attr *iio_attr, *t; | |
720 | ||
670c1103 | 721 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
722 | if (iio_attr == NULL) |
723 | return -ENOMEM; | |
1d892719 JC |
724 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
725 | postfix, chan, | |
3704432f | 726 | readfunc, writefunc, shared_by); |
1d892719 JC |
727 | if (ret) |
728 | goto error_iio_dev_attr_free; | |
729 | iio_attr->c = chan; | |
730 | iio_attr->address = mask; | |
731 | list_for_each_entry(t, attr_list, l) | |
732 | if (strcmp(t->dev_attr.attr.name, | |
733 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 734 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
735 | dev_err(dev, "tried to double register : %s\n", |
736 | t->dev_attr.attr.name); | |
737 | ret = -EBUSY; | |
738 | goto error_device_attr_deinit; | |
739 | } | |
1d892719 JC |
740 | list_add(&iio_attr->l, attr_list); |
741 | ||
742 | return 0; | |
743 | ||
744 | error_device_attr_deinit: | |
745 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
746 | error_iio_dev_attr_free: | |
747 | kfree(iio_attr); | |
1d892719 JC |
748 | return ret; |
749 | } | |
750 | ||
3704432f JC |
751 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
752 | struct iio_chan_spec const *chan, | |
753 | enum iio_shared_by shared_by, | |
754 | const long *infomask) | |
1d892719 | 755 | { |
3704432f | 756 | int i, ret, attrcount = 0; |
1d892719 | 757 | |
3704432f | 758 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
759 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
760 | return -EINVAL; | |
8655cc49 JC |
761 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
762 | chan, | |
763 | &iio_read_channel_info, | |
764 | &iio_write_channel_info, | |
765 | i, | |
3704432f | 766 | shared_by, |
8655cc49 JC |
767 | &indio_dev->dev, |
768 | &indio_dev->channel_attr_list); | |
3704432f | 769 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 770 | continue; |
3704432f JC |
771 | else if (ret < 0) |
772 | return ret; | |
8655cc49 JC |
773 | attrcount++; |
774 | } | |
5f420b42 | 775 | |
3704432f JC |
776 | return attrcount; |
777 | } | |
778 | ||
779 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, | |
780 | struct iio_chan_spec const *chan) | |
781 | { | |
782 | int ret, attrcount = 0; | |
783 | const struct iio_chan_spec_ext_info *ext_info; | |
784 | ||
785 | if (chan->channel < 0) | |
786 | return 0; | |
787 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
788 | IIO_SEPARATE, | |
789 | &chan->info_mask_separate); | |
790 | if (ret < 0) | |
791 | return ret; | |
792 | attrcount += ret; | |
793 | ||
794 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
795 | IIO_SHARED_BY_TYPE, | |
796 | &chan->info_mask_shared_by_type); | |
797 | if (ret < 0) | |
798 | return ret; | |
799 | attrcount += ret; | |
800 | ||
c006ec83 JC |
801 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
802 | IIO_SHARED_BY_DIR, | |
803 | &chan->info_mask_shared_by_dir); | |
804 | if (ret < 0) | |
805 | return ret; | |
806 | attrcount += ret; | |
807 | ||
808 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
809 | IIO_SHARED_BY_ALL, | |
810 | &chan->info_mask_shared_by_all); | |
811 | if (ret < 0) | |
812 | return ret; | |
813 | attrcount += ret; | |
814 | ||
5f420b42 LPC |
815 | if (chan->ext_info) { |
816 | unsigned int i = 0; | |
817 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
818 | ret = __iio_add_chan_devattr(ext_info->name, | |
819 | chan, | |
820 | ext_info->read ? | |
821 | &iio_read_channel_ext_info : NULL, | |
822 | ext_info->write ? | |
823 | &iio_write_channel_ext_info : NULL, | |
824 | i, | |
825 | ext_info->shared, | |
826 | &indio_dev->dev, | |
827 | &indio_dev->channel_attr_list); | |
828 | i++; | |
829 | if (ret == -EBUSY && ext_info->shared) | |
830 | continue; | |
831 | ||
832 | if (ret) | |
3704432f | 833 | return ret; |
5f420b42 LPC |
834 | |
835 | attrcount++; | |
836 | } | |
837 | } | |
838 | ||
3704432f | 839 | return attrcount; |
1d892719 JC |
840 | } |
841 | ||
84088ebd LPC |
842 | /** |
843 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
844 | * @attr_list: List of IIO device attributes | |
845 | * | |
846 | * This function frees the memory allocated for each of the IIO device | |
847 | * attributes in the list. Note: if you want to reuse the list after calling | |
848 | * this function you have to reinitialize it using INIT_LIST_HEAD(). | |
849 | */ | |
850 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 851 | { |
84088ebd LPC |
852 | struct iio_dev_attr *p, *n; |
853 | ||
854 | list_for_each_entry_safe(p, n, attr_list, l) { | |
855 | kfree(p->dev_attr.attr.name); | |
856 | kfree(p); | |
857 | } | |
1d892719 JC |
858 | } |
859 | ||
1b732888 JC |
860 | static ssize_t iio_show_dev_name(struct device *dev, |
861 | struct device_attribute *attr, | |
862 | char *buf) | |
863 | { | |
e53f5ac5 | 864 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 865 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
866 | } |
867 | ||
868 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
869 | ||
f8c6f4e9 | 870 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 871 | { |
26d25ae3 | 872 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 873 | struct iio_dev_attr *p; |
26d25ae3 | 874 | struct attribute **attr; |
1d892719 | 875 | |
26d25ae3 | 876 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
877 | if (indio_dev->info->attrs) { |
878 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
879 | while (*attr++ != NULL) |
880 | attrcount_orig++; | |
847ec80b | 881 | } |
26d25ae3 | 882 | attrcount = attrcount_orig; |
1d892719 JC |
883 | /* |
884 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 885 | * not need to be initialized if its name is NULL. |
1d892719 | 886 | */ |
f8c6f4e9 JC |
887 | if (indio_dev->channels) |
888 | for (i = 0; i < indio_dev->num_channels; i++) { | |
889 | ret = iio_device_add_channel_sysfs(indio_dev, | |
890 | &indio_dev | |
1d892719 JC |
891 | ->channels[i]); |
892 | if (ret < 0) | |
893 | goto error_clear_attrs; | |
26d25ae3 | 894 | attrcount += ret; |
1d892719 | 895 | } |
26d25ae3 | 896 | |
f8c6f4e9 | 897 | if (indio_dev->name) |
26d25ae3 JC |
898 | attrcount++; |
899 | ||
d83fb184 TM |
900 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
901 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
902 | GFP_KERNEL); | |
f8c6f4e9 | 903 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
904 | ret = -ENOMEM; |
905 | goto error_clear_attrs; | |
1b732888 | 906 | } |
26d25ae3 | 907 | /* Copy across original attributes */ |
f8c6f4e9 JC |
908 | if (indio_dev->info->attrs) |
909 | memcpy(indio_dev->chan_attr_group.attrs, | |
910 | indio_dev->info->attrs->attrs, | |
911 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
912 | *attrcount_orig); |
913 | attrn = attrcount_orig; | |
914 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
915 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
916 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
917 | if (indio_dev->name) | |
918 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 919 | |
f8c6f4e9 JC |
920 | indio_dev->groups[indio_dev->groupcounter++] = |
921 | &indio_dev->chan_attr_group; | |
26d25ae3 | 922 | |
1d892719 | 923 | return 0; |
1b732888 | 924 | |
1d892719 | 925 | error_clear_attrs: |
84088ebd | 926 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 927 | |
26d25ae3 | 928 | return ret; |
847ec80b JC |
929 | } |
930 | ||
f8c6f4e9 | 931 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 932 | { |
1d892719 | 933 | |
84088ebd | 934 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 935 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
936 | } |
937 | ||
847ec80b JC |
938 | static void iio_dev_release(struct device *device) |
939 | { | |
e53f5ac5 | 940 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
f8c6f4e9 JC |
941 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
942 | iio_device_unregister_trigger_consumer(indio_dev); | |
943 | iio_device_unregister_eventset(indio_dev); | |
944 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 945 | |
9e69c935 LPC |
946 | iio_buffer_put(indio_dev->buffer); |
947 | ||
e407fd65 LPC |
948 | ida_simple_remove(&iio_ida, indio_dev->id); |
949 | kfree(indio_dev); | |
847ec80b JC |
950 | } |
951 | ||
17d82b47 | 952 | struct device_type iio_device_type = { |
847ec80b JC |
953 | .name = "iio_device", |
954 | .release = iio_dev_release, | |
955 | }; | |
956 | ||
a7e57dce SK |
957 | /** |
958 | * iio_device_alloc() - allocate an iio_dev from a driver | |
959 | * @sizeof_priv: Space to allocate for private structure. | |
960 | **/ | |
7cbb7537 | 961 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 962 | { |
6f7c8ee5 JC |
963 | struct iio_dev *dev; |
964 | size_t alloc_size; | |
965 | ||
966 | alloc_size = sizeof(struct iio_dev); | |
967 | if (sizeof_priv) { | |
968 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
969 | alloc_size += sizeof_priv; | |
970 | } | |
971 | /* ensure 32-byte alignment of whole construct ? */ | |
972 | alloc_size += IIO_ALIGN - 1; | |
973 | ||
974 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
975 | |
976 | if (dev) { | |
26d25ae3 | 977 | dev->dev.groups = dev->groups; |
17d82b47 | 978 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 979 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
980 | device_initialize(&dev->dev); |
981 | dev_set_drvdata(&dev->dev, (void *)dev); | |
982 | mutex_init(&dev->mlock); | |
ac917a81 | 983 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 984 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
985 | |
986 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
987 | if (dev->id < 0) { | |
988 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 989 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
990 | kfree(dev); |
991 | return NULL; | |
992 | } | |
993 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 994 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
995 | } |
996 | ||
997 | return dev; | |
998 | } | |
7cbb7537 | 999 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1000 | |
a7e57dce SK |
1001 | /** |
1002 | * iio_device_free() - free an iio_dev from a driver | |
1003 | * @dev: the iio_dev associated with the device | |
1004 | **/ | |
7cbb7537 | 1005 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1006 | { |
e407fd65 LPC |
1007 | if (dev) |
1008 | put_device(&dev->dev); | |
847ec80b | 1009 | } |
7cbb7537 | 1010 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1011 | |
9dabaf5e GS |
1012 | static void devm_iio_device_release(struct device *dev, void *res) |
1013 | { | |
1014 | iio_device_free(*(struct iio_dev **)res); | |
1015 | } | |
1016 | ||
1017 | static int devm_iio_device_match(struct device *dev, void *res, void *data) | |
1018 | { | |
1019 | struct iio_dev **r = res; | |
1020 | if (!r || !*r) { | |
1021 | WARN_ON(!r || !*r); | |
1022 | return 0; | |
1023 | } | |
1024 | return *r == data; | |
1025 | } | |
1026 | ||
a7e57dce SK |
1027 | /** |
1028 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1029 | * @dev: Device to allocate iio_dev for | |
1030 | * @sizeof_priv: Space to allocate for private structure. | |
1031 | * | |
1032 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1033 | * automatically freed on driver detach. | |
1034 | * | |
1035 | * If an iio_dev allocated with this function needs to be freed separately, | |
1036 | * devm_iio_device_free() must be used. | |
1037 | * | |
1038 | * RETURNS: | |
1039 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1040 | */ | |
9dabaf5e GS |
1041 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1042 | { | |
1043 | struct iio_dev **ptr, *iio_dev; | |
1044 | ||
1045 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1046 | GFP_KERNEL); | |
1047 | if (!ptr) | |
1048 | return NULL; | |
1049 | ||
9dabaf5e GS |
1050 | iio_dev = iio_device_alloc(sizeof_priv); |
1051 | if (iio_dev) { | |
1052 | *ptr = iio_dev; | |
1053 | devres_add(dev, ptr); | |
1054 | } else { | |
1055 | devres_free(ptr); | |
1056 | } | |
1057 | ||
1058 | return iio_dev; | |
1059 | } | |
1060 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1061 | ||
a7e57dce SK |
1062 | /** |
1063 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1064 | * @dev: Device this iio_dev belongs to | |
1065 | * @iio_dev: the iio_dev associated with the device | |
1066 | * | |
1067 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1068 | */ | |
9dabaf5e GS |
1069 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1070 | { | |
1071 | int rc; | |
1072 | ||
1073 | rc = devres_release(dev, devm_iio_device_release, | |
1074 | devm_iio_device_match, iio_dev); | |
1075 | WARN_ON(rc); | |
1076 | } | |
1077 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1078 | ||
1aa04278 | 1079 | /** |
14555b14 | 1080 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
1081 | **/ |
1082 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1083 | { | |
f8c6f4e9 | 1084 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1085 | struct iio_dev, chrdev); |
bb01443e LPC |
1086 | |
1087 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1088 | return -EBUSY; | |
1089 | ||
cadc2125 LPC |
1090 | iio_device_get(indio_dev); |
1091 | ||
f8c6f4e9 | 1092 | filp->private_data = indio_dev; |
30eb82f0 | 1093 | |
79335140 | 1094 | return 0; |
1aa04278 JC |
1095 | } |
1096 | ||
1097 | /** | |
14555b14 | 1098 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
1099 | **/ |
1100 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
1101 | { | |
bb01443e LPC |
1102 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1103 | struct iio_dev, chrdev); | |
bb01443e | 1104 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1105 | iio_device_put(indio_dev); |
1106 | ||
1aa04278 JC |
1107 | return 0; |
1108 | } | |
1109 | ||
1110 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1111 | * event related */ | |
1112 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1113 | { | |
1114 | struct iio_dev *indio_dev = filp->private_data; | |
1115 | int __user *ip = (int __user *)arg; | |
1116 | int fd; | |
1117 | ||
f18e7a06 LPC |
1118 | if (!indio_dev->info) |
1119 | return -ENODEV; | |
1120 | ||
1aa04278 JC |
1121 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1122 | fd = iio_event_getfd(indio_dev); | |
1123 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
1124 | return -EFAULT; | |
1125 | return 0; | |
1126 | } | |
1127 | return -EINVAL; | |
1128 | } | |
1129 | ||
14555b14 JC |
1130 | static const struct file_operations iio_buffer_fileops = { |
1131 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1132 | .release = iio_chrdev_release, |
1133 | .open = iio_chrdev_open, | |
14555b14 | 1134 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1135 | .owner = THIS_MODULE, |
1136 | .llseek = noop_llseek, | |
1137 | .unlocked_ioctl = iio_ioctl, | |
1138 | .compat_ioctl = iio_ioctl, | |
1139 | }; | |
1140 | ||
8f5d8727 VD |
1141 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1142 | { | |
1143 | int i, j; | |
1144 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1145 | ||
1146 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1147 | return 0; | |
1148 | ||
1149 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1150 | if (channels[i].scan_index < 0) | |
1151 | continue; | |
1152 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1153 | if (channels[i].scan_index == channels[j].scan_index) { | |
1154 | dev_err(&indio_dev->dev, | |
1155 | "Duplicate scan index %d\n", | |
1156 | channels[i].scan_index); | |
1157 | return -EINVAL; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
0f1acee5 MH |
1164 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1165 | ||
a7e57dce SK |
1166 | /** |
1167 | * iio_device_register() - register a device with the IIO subsystem | |
1168 | * @indio_dev: Device structure filled by the device driver | |
1169 | **/ | |
f8c6f4e9 | 1170 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1171 | { |
1172 | int ret; | |
1173 | ||
17d82b47 GR |
1174 | /* If the calling driver did not initialize of_node, do it here */ |
1175 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1176 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1177 | ||
8f5d8727 VD |
1178 | ret = iio_check_unique_scan_index(indio_dev); |
1179 | if (ret < 0) | |
1180 | return ret; | |
1181 | ||
1aa04278 | 1182 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1183 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1184 | |
e553f182 MH |
1185 | ret = iio_device_register_debugfs(indio_dev); |
1186 | if (ret) { | |
1187 | dev_err(indio_dev->dev.parent, | |
1188 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1189 | return ret; |
e553f182 | 1190 | } |
3e1b6c95 LPC |
1191 | |
1192 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1193 | if (ret) { | |
1194 | dev_err(indio_dev->dev.parent, | |
1195 | "Failed to create buffer sysfs interfaces\n"); | |
1196 | goto error_unreg_debugfs; | |
1197 | } | |
1198 | ||
f8c6f4e9 | 1199 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1200 | if (ret) { |
f8c6f4e9 | 1201 | dev_err(indio_dev->dev.parent, |
847ec80b | 1202 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1203 | goto error_buffer_free_sysfs; |
847ec80b | 1204 | } |
f8c6f4e9 | 1205 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1206 | if (ret) { |
f8c6f4e9 | 1207 | dev_err(indio_dev->dev.parent, |
c849d253 | 1208 | "Failed to register event set\n"); |
847ec80b JC |
1209 | goto error_free_sysfs; |
1210 | } | |
f8c6f4e9 JC |
1211 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
1212 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 1213 | |
0f1acee5 MH |
1214 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1215 | indio_dev->setup_ops == NULL) | |
1216 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1217 | ||
f8c6f4e9 JC |
1218 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1219 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1220 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1221 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1222 | if (ret < 0) |
0d5b7dae | 1223 | goto error_unreg_eventset; |
847ec80b | 1224 | |
0d5b7dae LPC |
1225 | ret = device_add(&indio_dev->dev); |
1226 | if (ret < 0) | |
1227 | goto error_cdev_del; | |
1228 | ||
1229 | return 0; | |
1230 | error_cdev_del: | |
1231 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1232 | error_unreg_eventset: |
f8c6f4e9 | 1233 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1234 | error_free_sysfs: |
f8c6f4e9 | 1235 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1236 | error_buffer_free_sysfs: |
1237 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1238 | error_unreg_debugfs: |
1239 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1240 | return ret; |
1241 | } | |
1242 | EXPORT_SYMBOL(iio_device_register); | |
1243 | ||
a7e57dce SK |
1244 | /** |
1245 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1246 | * @indio_dev: Device structure representing the device. | |
1247 | **/ | |
f8c6f4e9 | 1248 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1249 | { |
ac917a81 | 1250 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1251 | |
1252 | device_del(&indio_dev->dev); | |
1253 | ||
0d5b7dae LPC |
1254 | if (indio_dev->chrdev.dev) |
1255 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1256 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1257 | |
a87c82e4 LPC |
1258 | iio_disable_all_buffers(indio_dev); |
1259 | ||
ac917a81 | 1260 | indio_dev->info = NULL; |
d2f0a48f LPC |
1261 | |
1262 | iio_device_wakeup_eventset(indio_dev); | |
1263 | iio_buffer_wakeup_poll(indio_dev); | |
1264 | ||
ac917a81 | 1265 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1266 | |
1267 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1268 | } |
1269 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1270 | |
1271 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1272 | { | |
1273 | iio_device_unregister(*(struct iio_dev **)res); | |
1274 | } | |
1275 | ||
1276 | /** | |
1277 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1278 | * @dev: Device to allocate iio_dev for | |
1279 | * @indio_dev: Device structure filled by the device driver | |
1280 | * | |
1281 | * Managed iio_device_register. The IIO device registered with this | |
1282 | * function is automatically unregistered on driver detach. This function | |
1283 | * calls iio_device_register() internally. Refer to that function for more | |
1284 | * information. | |
1285 | * | |
1286 | * If an iio_dev registered with this function needs to be unregistered | |
1287 | * separately, devm_iio_device_unregister() must be used. | |
1288 | * | |
1289 | * RETURNS: | |
1290 | * 0 on success, negative error number on failure. | |
1291 | */ | |
1292 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1293 | { | |
1294 | struct iio_dev **ptr; | |
1295 | int ret; | |
1296 | ||
1297 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1298 | if (!ptr) | |
1299 | return -ENOMEM; | |
1300 | ||
1301 | *ptr = indio_dev; | |
1302 | ret = iio_device_register(indio_dev); | |
1303 | if (!ret) | |
1304 | devres_add(dev, ptr); | |
1305 | else | |
1306 | devres_free(ptr); | |
1307 | ||
1308 | return ret; | |
1309 | } | |
1310 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1311 | ||
1312 | /** | |
1313 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1314 | * @dev: Device this iio_dev belongs to | |
1315 | * @indio_dev: the iio_dev associated with the device | |
1316 | * | |
1317 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1318 | */ | |
1319 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1320 | { | |
1321 | int rc; | |
1322 | ||
1323 | rc = devres_release(dev, devm_iio_device_unreg, | |
1324 | devm_iio_device_match, indio_dev); | |
1325 | WARN_ON(rc); | |
1326 | } | |
1327 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1328 | ||
847ec80b JC |
1329 | subsys_initcall(iio_init); |
1330 | module_exit(iio_exit); | |
1331 | ||
c8b95952 | 1332 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1333 | MODULE_DESCRIPTION("Industrial I/O core"); |
1334 | MODULE_LICENSE("GPL"); |