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