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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
847ec80b JC |
2 | /* The industrial I/O core |
3 | * | |
4 | * Copyright (c) 2008 Jonathan Cameron | |
5 | * | |
847ec80b JC |
6 | * Based on elements of hwmon and input subsystems. |
7 | */ | |
8 | ||
3176dd5d SK |
9 | #define pr_fmt(fmt) "iio-core: " fmt |
10 | ||
847ec80b JC |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/idr.h> | |
14 | #include <linux/kdev_t.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/fs.h> | |
847ec80b | 18 | #include <linux/poll.h> |
fb158971 | 19 | #include <linux/property.h> |
ffc18afa | 20 | #include <linux/sched.h> |
4439c935 | 21 | #include <linux/wait.h> |
847ec80b | 22 | #include <linux/cdev.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
8e7d9672 | 24 | #include <linux/anon_inodes.h> |
e553f182 | 25 | #include <linux/debugfs.h> |
08a33805 | 26 | #include <linux/mutex.h> |
06458e27 | 27 | #include <linux/iio/iio.h> |
df9c1c42 | 28 | #include "iio_core.h" |
6aea1c36 | 29 | #include "iio_core_trigger.h" |
06458e27 JC |
30 | #include <linux/iio/sysfs.h> |
31 | #include <linux/iio/events.h> | |
9e69c935 | 32 | #include <linux/iio/buffer.h> |
33dd94cb | 33 | #include <linux/iio/buffer_impl.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", |
8ff6b3bc | 78 | [IIO_CONCENTRATION] = "concentration", |
d38d5469 | 79 | [IIO_RESISTANCE] = "resistance", |
ecb3a7cc | 80 | [IIO_PH] = "ph", |
d409404c | 81 | [IIO_UVINDEX] = "uvindex", |
4b9d2090 | 82 | [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
1a8f324a WBG |
83 | [IIO_COUNT] = "count", |
84 | [IIO_INDEX] = "index", | |
571299d0 | 85 | [IIO_GRAVITY] = "gravity", |
3055a6cf | 86 | [IIO_POSITIONRELATIVE] = "positionrelative", |
c73314e6 | 87 | [IIO_PHASE] = "phase", |
17abc9ec | 88 | [IIO_MASSCONCENTRATION] = "massconcentration", |
1d892719 JC |
89 | }; |
90 | ||
330c6c57 | 91 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
92 | [IIO_MOD_X] = "x", |
93 | [IIO_MOD_Y] = "y", | |
94 | [IIO_MOD_Z] = "z", | |
4b8d8015 PM |
95 | [IIO_MOD_X_AND_Y] = "x&y", |
96 | [IIO_MOD_X_AND_Z] = "x&z", | |
97 | [IIO_MOD_Y_AND_Z] = "y&z", | |
98 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", | |
99 | [IIO_MOD_X_OR_Y] = "x|y", | |
100 | [IIO_MOD_X_OR_Z] = "x|z", | |
101 | [IIO_MOD_Y_OR_Z] = "y|z", | |
102 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", | |
8f5879b2 | 103 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 104 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
105 | [IIO_MOD_LIGHT_BOTH] = "both", |
106 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
107 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
108 | [IIO_MOD_LIGHT_RED] = "red", | |
109 | [IIO_MOD_LIGHT_GREEN] = "green", | |
110 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
2c5ff1f9 | 111 | [IIO_MOD_LIGHT_UV] = "uv", |
c0e4e0fd | 112 | [IIO_MOD_LIGHT_DUV] = "duv", |
5082f405 | 113 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
114 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
115 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
116 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
117 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
118 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
119 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
120 | [IIO_MOD_RUNNING] = "running", |
121 | [IIO_MOD_JOGGING] = "jogging", | |
122 | [IIO_MOD_WALKING] = "walking", | |
123 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 124 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1ce87f21 LPC |
125 | [IIO_MOD_I] = "i", |
126 | [IIO_MOD_Q] = "q", | |
8ff6b3bc MR |
127 | [IIO_MOD_CO2] = "co2", |
128 | [IIO_MOD_VOC] = "voc", | |
17abc9ec TD |
129 | [IIO_MOD_PM1] = "pm1", |
130 | [IIO_MOD_PM2P5] = "pm2p5", | |
131 | [IIO_MOD_PM4] = "pm4", | |
132 | [IIO_MOD_PM10] = "pm10", | |
1d892719 JC |
133 | }; |
134 | ||
135 | /* relies on pairs of these shared then separate */ | |
136 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
137 | [IIO_CHAN_INFO_RAW] = "raw", |
138 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
139 | [IIO_CHAN_INFO_SCALE] = "scale", |
140 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
141 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
142 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
143 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
144 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
145 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
146 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
147 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
148 | = "filter_low_pass_3db_frequency", | |
3f7f642b MF |
149 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
150 | = "filter_high_pass_3db_frequency", | |
ce85a1cb | 151 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
152 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
153 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 154 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 155 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 156 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 157 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 158 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
d37f6836 | 159 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
2f0ecb7c IT |
160 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
161 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", | |
c8a85854 | 162 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
faaa4495 | 163 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
ddfb97d8 | 164 | [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type", |
1d892719 JC |
165 | }; |
166 | ||
a7e57dce SK |
167 | /** |
168 | * iio_find_channel_from_si() - get channel from its scan index | |
169 | * @indio_dev: device | |
170 | * @si: scan index to match | |
171 | */ | |
5fb21c82 JC |
172 | const struct iio_chan_spec |
173 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
174 | { | |
175 | int i; | |
176 | ||
177 | for (i = 0; i < indio_dev->num_channels; i++) | |
178 | if (indio_dev->channels[i].scan_index == si) | |
179 | return &indio_dev->channels[i]; | |
180 | return NULL; | |
181 | } | |
182 | ||
847ec80b JC |
183 | /* This turns up an awful lot */ |
184 | ssize_t iio_read_const_attr(struct device *dev, | |
185 | struct device_attribute *attr, | |
186 | char *buf) | |
187 | { | |
188 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
189 | } | |
190 | EXPORT_SYMBOL(iio_read_const_attr); | |
191 | ||
bc2b7dab GB |
192 | static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) |
193 | { | |
194 | int ret; | |
195 | const struct iio_event_interface *ev_int = indio_dev->event_interface; | |
196 | ||
197 | ret = mutex_lock_interruptible(&indio_dev->mlock); | |
198 | if (ret) | |
199 | return ret; | |
200 | if ((ev_int && iio_event_enabled(ev_int)) || | |
201 | iio_buffer_enabled(indio_dev)) { | |
202 | mutex_unlock(&indio_dev->mlock); | |
203 | return -EBUSY; | |
204 | } | |
205 | indio_dev->clock_id = clock_id; | |
206 | mutex_unlock(&indio_dev->mlock); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | /** | |
212 | * iio_get_time_ns() - utility function to get a time stamp for events etc | |
213 | * @indio_dev: device | |
214 | */ | |
215 | s64 iio_get_time_ns(const struct iio_dev *indio_dev) | |
216 | { | |
45e7f5d2 | 217 | struct timespec64 tp; |
bc2b7dab GB |
218 | |
219 | switch (iio_device_get_clock(indio_dev)) { | |
220 | case CLOCK_REALTIME: | |
45e7f5d2 | 221 | return ktime_get_real_ns(); |
bc2b7dab | 222 | case CLOCK_MONOTONIC: |
45e7f5d2 | 223 | return ktime_get_ns(); |
bc2b7dab | 224 | case CLOCK_MONOTONIC_RAW: |
45e7f5d2 | 225 | return ktime_get_raw_ns(); |
bc2b7dab | 226 | case CLOCK_REALTIME_COARSE: |
45e7f5d2 | 227 | return ktime_to_ns(ktime_get_coarse_real()); |
bc2b7dab | 228 | case CLOCK_MONOTONIC_COARSE: |
45e7f5d2 AB |
229 | ktime_get_coarse_ts64(&tp); |
230 | return timespec64_to_ns(&tp); | |
bc2b7dab | 231 | case CLOCK_BOOTTIME: |
9285ec4c | 232 | return ktime_get_boottime_ns(); |
bc2b7dab | 233 | case CLOCK_TAI: |
9285ec4c | 234 | return ktime_get_clocktai_ns(); |
bc2b7dab GB |
235 | default: |
236 | BUG(); | |
237 | } | |
bc2b7dab GB |
238 | } |
239 | EXPORT_SYMBOL(iio_get_time_ns); | |
240 | ||
241 | /** | |
242 | * iio_get_time_res() - utility function to get time stamp clock resolution in | |
243 | * nano seconds. | |
244 | * @indio_dev: device | |
245 | */ | |
246 | unsigned int iio_get_time_res(const struct iio_dev *indio_dev) | |
247 | { | |
248 | switch (iio_device_get_clock(indio_dev)) { | |
249 | case CLOCK_REALTIME: | |
250 | case CLOCK_MONOTONIC: | |
251 | case CLOCK_MONOTONIC_RAW: | |
252 | case CLOCK_BOOTTIME: | |
253 | case CLOCK_TAI: | |
254 | return hrtimer_resolution; | |
255 | case CLOCK_REALTIME_COARSE: | |
256 | case CLOCK_MONOTONIC_COARSE: | |
257 | return LOW_RES_NSEC; | |
258 | default: | |
259 | BUG(); | |
260 | } | |
261 | } | |
262 | EXPORT_SYMBOL(iio_get_time_res); | |
263 | ||
847ec80b JC |
264 | static int __init iio_init(void) |
265 | { | |
266 | int ret; | |
267 | ||
5aaaeba8 JC |
268 | /* Register sysfs bus */ |
269 | ret = bus_register(&iio_bus_type); | |
847ec80b | 270 | if (ret < 0) { |
3176dd5d | 271 | pr_err("could not register bus type\n"); |
847ec80b JC |
272 | goto error_nothing; |
273 | } | |
274 | ||
9aa1a167 JC |
275 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
276 | if (ret < 0) { | |
3176dd5d | 277 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 278 | goto error_unregister_bus_type; |
9aa1a167 | 279 | } |
847ec80b | 280 | |
e553f182 MH |
281 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
282 | ||
847ec80b JC |
283 | return 0; |
284 | ||
5aaaeba8 JC |
285 | error_unregister_bus_type: |
286 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
287 | error_nothing: |
288 | return ret; | |
289 | } | |
290 | ||
291 | static void __exit iio_exit(void) | |
292 | { | |
9aa1a167 JC |
293 | if (iio_devt) |
294 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 295 | bus_unregister(&iio_bus_type); |
e553f182 MH |
296 | debugfs_remove(iio_debugfs_dentry); |
297 | } | |
298 | ||
299 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
300 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
301 | size_t count, loff_t *ppos) | |
302 | { | |
303 | struct iio_dev *indio_dev = file->private_data; | |
e553f182 | 304 | unsigned val = 0; |
e553f182 MH |
305 | int ret; |
306 | ||
2ddc982a AT |
307 | if (*ppos > 0) |
308 | return simple_read_from_buffer(userbuf, count, ppos, | |
309 | indio_dev->read_buf, | |
310 | indio_dev->read_buf_len); | |
311 | ||
e553f182 MH |
312 | ret = indio_dev->info->debugfs_reg_access(indio_dev, |
313 | indio_dev->cached_reg_addr, | |
314 | 0, &val); | |
3d62c78a | 315 | if (ret) { |
e553f182 | 316 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); |
3d62c78a MF |
317 | return ret; |
318 | } | |
e553f182 | 319 | |
2ddc982a AT |
320 | indio_dev->read_buf_len = snprintf(indio_dev->read_buf, |
321 | sizeof(indio_dev->read_buf), | |
322 | "0x%X\n", val); | |
e553f182 | 323 | |
2ddc982a AT |
324 | return simple_read_from_buffer(userbuf, count, ppos, |
325 | indio_dev->read_buf, | |
326 | indio_dev->read_buf_len); | |
e553f182 MH |
327 | } |
328 | ||
329 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
330 | const char __user *userbuf, size_t count, loff_t *ppos) | |
331 | { | |
332 | struct iio_dev *indio_dev = file->private_data; | |
333 | unsigned reg, val; | |
334 | char buf[80]; | |
335 | int ret; | |
336 | ||
337 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
338 | if (copy_from_user(buf, userbuf, count)) | |
339 | return -EFAULT; | |
340 | ||
341 | buf[count] = 0; | |
342 | ||
343 | ret = sscanf(buf, "%i %i", ®, &val); | |
344 | ||
345 | switch (ret) { | |
346 | case 1: | |
347 | indio_dev->cached_reg_addr = reg; | |
348 | break; | |
349 | case 2: | |
350 | indio_dev->cached_reg_addr = reg; | |
351 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
352 | val, NULL); | |
353 | if (ret) { | |
354 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
355 | __func__); | |
356 | return ret; | |
357 | } | |
358 | break; | |
359 | default: | |
360 | return -EINVAL; | |
361 | } | |
362 | ||
363 | return count; | |
364 | } | |
365 | ||
366 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 367 | .open = simple_open, |
e553f182 MH |
368 | .read = iio_debugfs_read_reg, |
369 | .write = iio_debugfs_write_reg, | |
370 | }; | |
371 | ||
372 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
373 | { | |
374 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
375 | } |
376 | ||
8915aaca | 377 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
e553f182 | 378 | { |
e553f182 | 379 | if (indio_dev->info->debugfs_reg_access == NULL) |
8915aaca | 380 | return; |
e553f182 | 381 | |
abd5a2fb | 382 | if (!iio_debugfs_dentry) |
8915aaca | 383 | return; |
e553f182 MH |
384 | |
385 | indio_dev->debugfs_dentry = | |
386 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
387 | iio_debugfs_dentry); | |
e553f182 | 388 | |
8915aaca GKH |
389 | debugfs_create_file("direct_reg_access", 0644, |
390 | indio_dev->debugfs_dentry, indio_dev, | |
391 | &iio_debugfs_reg_fops); | |
e553f182 MH |
392 | } |
393 | #else | |
8915aaca | 394 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
e553f182 | 395 | { |
e553f182 MH |
396 | } |
397 | ||
398 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
399 | { | |
400 | } | |
401 | #endif /* CONFIG_DEBUG_FS */ | |
402 | ||
4fee7e16 LPC |
403 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
404 | struct device_attribute *attr, | |
405 | char *buf) | |
406 | { | |
e53f5ac5 | 407 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
408 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
409 | const struct iio_chan_spec_ext_info *ext_info; | |
410 | ||
411 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
412 | ||
fc6d1139 | 413 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
414 | } |
415 | ||
416 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
417 | struct device_attribute *attr, | |
418 | const char *buf, | |
419 | size_t len) | |
420 | { | |
e53f5ac5 | 421 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
422 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
423 | const struct iio_chan_spec_ext_info *ext_info; | |
424 | ||
425 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
426 | ||
fc6d1139 MH |
427 | return ext_info->write(indio_dev, ext_info->private, |
428 | this_attr->c, buf, len); | |
4fee7e16 LPC |
429 | } |
430 | ||
5212cc8a LPC |
431 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
432 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
433 | { | |
434 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
435 | unsigned int i; | |
436 | size_t len = 0; | |
437 | ||
438 | if (!e->num_items) | |
439 | return 0; | |
440 | ||
441 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 442 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
443 | |
444 | /* replace last space with a newline */ | |
445 | buf[len - 1] = '\n'; | |
446 | ||
447 | return len; | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
450 | ||
451 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
452 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
453 | { | |
454 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
455 | int i; | |
456 | ||
457 | if (!e->get) | |
458 | return -EINVAL; | |
459 | ||
460 | i = e->get(indio_dev, chan); | |
461 | if (i < 0) | |
462 | return i; | |
463 | else if (i >= e->num_items) | |
464 | return -EINVAL; | |
465 | ||
598db581 | 466 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
467 | } |
468 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
469 | ||
470 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
471 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
472 | size_t len) | |
473 | { | |
474 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
5212cc8a LPC |
475 | int ret; |
476 | ||
477 | if (!e->set) | |
478 | return -EINVAL; | |
479 | ||
02e9a0ff AS |
480 | ret = __sysfs_match_string(e->items, e->num_items, buf); |
481 | if (ret < 0) | |
482 | return ret; | |
5212cc8a | 483 | |
02e9a0ff | 484 | ret = e->set(indio_dev, chan, ret); |
5212cc8a LPC |
485 | return ret ? ret : len; |
486 | } | |
487 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
488 | ||
dfc57732 GB |
489 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
490 | .rotation = { | |
491 | "1", "0", "0", | |
492 | "0", "1", "0", | |
493 | "0", "0", "1" | |
494 | } | |
495 | }; | |
496 | ||
497 | static int iio_setup_mount_idmatrix(const struct device *dev, | |
498 | struct iio_mount_matrix *matrix) | |
499 | { | |
500 | *matrix = iio_mount_idmatrix; | |
501 | dev_info(dev, "mounting matrix not found: using identity...\n"); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, | |
506 | const struct iio_chan_spec *chan, char *buf) | |
507 | { | |
508 | const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) | |
509 | priv)(indio_dev, chan); | |
510 | ||
511 | if (IS_ERR(mtx)) | |
512 | return PTR_ERR(mtx); | |
513 | ||
514 | if (!mtx) | |
515 | mtx = &iio_mount_idmatrix; | |
516 | ||
517 | return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", | |
518 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], | |
519 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], | |
520 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); | |
521 | } | |
522 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); | |
523 | ||
524 | /** | |
fb158971 AS |
525 | * iio_read_mount_matrix() - retrieve iio device mounting matrix from |
526 | * device "mount-matrix" property | |
dfc57732 GB |
527 | * @dev: device the mounting matrix property is assigned to |
528 | * @propname: device specific mounting matrix property name | |
529 | * @matrix: where to store retrieved matrix | |
530 | * | |
531 | * If device is assigned no mounting matrix property, a default 3x3 identity | |
532 | * matrix will be filled in. | |
533 | * | |
534 | * Return: 0 if success, or a negative error code on failure. | |
535 | */ | |
fb158971 AS |
536 | int iio_read_mount_matrix(struct device *dev, const char *propname, |
537 | struct iio_mount_matrix *matrix) | |
dfc57732 | 538 | { |
fb158971 AS |
539 | size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation); |
540 | int err; | |
dfc57732 | 541 | |
fb158971 AS |
542 | err = device_property_read_string_array(dev, propname, |
543 | matrix->rotation, len); | |
544 | if (err == len) | |
545 | return 0; | |
dfc57732 | 546 | |
fb158971 AS |
547 | if (err >= 0) |
548 | /* Invalid number of matrix entries. */ | |
549 | return -EINVAL; | |
dfc57732 | 550 | |
fb158971 AS |
551 | if (err != -EINVAL) |
552 | /* Invalid matrix declaration format. */ | |
553 | return err; | |
dfc57732 GB |
554 | |
555 | /* Matrix was not declared at all: fallback to identity. */ | |
556 | return iio_setup_mount_idmatrix(dev, matrix); | |
557 | } | |
fb158971 | 558 | EXPORT_SYMBOL(iio_read_mount_matrix); |
dfc57732 | 559 | |
51239600 JC |
560 | static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, |
561 | int size, const int *vals) | |
847ec80b | 562 | { |
7985e7c1 | 563 | unsigned long long tmp; |
51239600 | 564 | int tmp0, tmp1; |
67eedba3 | 565 | bool scale_db = false; |
1d892719 | 566 | |
3661f3f5 | 567 | switch (type) { |
67eedba3 | 568 | case IIO_VAL_INT: |
51239600 | 569 | return snprintf(buf, len, "%d", vals[0]); |
67eedba3 MH |
570 | case IIO_VAL_INT_PLUS_MICRO_DB: |
571 | scale_db = true; | |
9d793c1a | 572 | /* fall through */ |
67eedba3 | 573 | case IIO_VAL_INT_PLUS_MICRO: |
9fbfb4b3 | 574 | if (vals[1] < 0) |
51239600 JC |
575 | return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]), |
576 | -vals[1], scale_db ? " dB" : ""); | |
1d892719 | 577 | else |
51239600 JC |
578 | return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1], |
579 | scale_db ? " dB" : ""); | |
67eedba3 | 580 | case IIO_VAL_INT_PLUS_NANO: |
9fbfb4b3 | 581 | if (vals[1] < 0) |
51239600 JC |
582 | return snprintf(buf, len, "-%d.%09u", abs(vals[0]), |
583 | -vals[1]); | |
71646e2c | 584 | else |
51239600 | 585 | return snprintf(buf, len, "%d.%09u", vals[0], vals[1]); |
7985e7c1 | 586 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 | 587 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
51239600 JC |
588 | tmp1 = vals[1]; |
589 | tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1); | |
590 | return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); | |
103d9fb9 | 591 | case IIO_VAL_FRACTIONAL_LOG2: |
7fd6592d NS |
592 | tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]); |
593 | tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1); | |
594 | return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); | |
9fbfb4b3 SP |
595 | case IIO_VAL_INT_MULTIPLE: |
596 | { | |
597 | int i; | |
51239600 | 598 | int l = 0; |
9fbfb4b3 | 599 | |
51239600 JC |
600 | for (i = 0; i < size; ++i) { |
601 | l += snprintf(&buf[l], len - l, "%d ", vals[i]); | |
602 | if (l >= len) | |
603 | break; | |
604 | } | |
605 | return l; | |
9fbfb4b3 | 606 | } |
8cb34036 AM |
607 | case IIO_VAL_CHAR: |
608 | return snprintf(buf, len, "%c", (char)vals[0]); | |
67eedba3 | 609 | default: |
1d892719 | 610 | return 0; |
67eedba3 | 611 | } |
1d892719 | 612 | } |
51239600 JC |
613 | |
614 | /** | |
615 | * iio_format_value() - Formats a IIO value into its string representation | |
616 | * @buf: The buffer to which the formatted value gets written | |
617 | * which is assumed to be big enough (i.e. PAGE_SIZE). | |
c175cb7c | 618 | * @type: One of the IIO_VAL_* constants. This decides how the val |
51239600 JC |
619 | * and val2 parameters are formatted. |
620 | * @size: Number of IIO value entries contained in vals | |
621 | * @vals: Pointer to the values, exact meaning depends on the | |
622 | * type parameter. | |
623 | * | |
624 | * Return: 0 by default, a negative number on failure or the | |
625 | * total number of characters written for a type that belongs | |
c175cb7c | 626 | * to the IIO_VAL_* constant. |
51239600 JC |
627 | */ |
628 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) | |
629 | { | |
630 | ssize_t len; | |
631 | ||
632 | len = __iio_format_value(buf, PAGE_SIZE, type, size, vals); | |
633 | if (len >= PAGE_SIZE - 1) | |
634 | return -EFBIG; | |
635 | ||
636 | return len + sprintf(buf + len, "\n"); | |
637 | } | |
7d2c2aca | 638 | EXPORT_SYMBOL_GPL(iio_format_value); |
1d892719 | 639 | |
3661f3f5 LPC |
640 | static ssize_t iio_read_channel_info(struct device *dev, |
641 | struct device_attribute *attr, | |
642 | char *buf) | |
643 | { | |
644 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
645 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
646 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
647 | int ret; | |
648 | int val_len = 2; | |
649 | ||
650 | if (indio_dev->info->read_raw_multi) | |
651 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
652 | INDIO_MAX_RAW_ELEMENTS, | |
653 | vals, &val_len, | |
654 | this_attr->address); | |
655 | else | |
656 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
657 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
658 | |
659 | if (ret < 0) | |
660 | return ret; | |
661 | ||
9fbfb4b3 | 662 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
663 | } |
664 | ||
51239600 JC |
665 | static ssize_t iio_format_avail_list(char *buf, const int *vals, |
666 | int type, int length) | |
667 | { | |
668 | int i; | |
669 | ssize_t len = 0; | |
670 | ||
671 | switch (type) { | |
672 | case IIO_VAL_INT: | |
673 | for (i = 0; i < length; i++) { | |
674 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
675 | type, 1, &vals[i]); | |
676 | if (len >= PAGE_SIZE) | |
677 | return -EFBIG; | |
678 | if (i < length - 1) | |
679 | len += snprintf(buf + len, PAGE_SIZE - len, | |
680 | " "); | |
681 | else | |
682 | len += snprintf(buf + len, PAGE_SIZE - len, | |
683 | "\n"); | |
684 | if (len >= PAGE_SIZE) | |
685 | return -EFBIG; | |
686 | } | |
687 | break; | |
688 | default: | |
689 | for (i = 0; i < length / 2; i++) { | |
690 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
691 | type, 2, &vals[i * 2]); | |
692 | if (len >= PAGE_SIZE) | |
693 | return -EFBIG; | |
694 | if (i < length / 2 - 1) | |
695 | len += snprintf(buf + len, PAGE_SIZE - len, | |
696 | " "); | |
697 | else | |
698 | len += snprintf(buf + len, PAGE_SIZE - len, | |
699 | "\n"); | |
700 | if (len >= PAGE_SIZE) | |
701 | return -EFBIG; | |
702 | } | |
703 | } | |
704 | ||
705 | return len; | |
706 | } | |
707 | ||
708 | static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) | |
709 | { | |
710 | int i; | |
711 | ssize_t len; | |
712 | ||
713 | len = snprintf(buf, PAGE_SIZE, "["); | |
714 | switch (type) { | |
715 | case IIO_VAL_INT: | |
716 | for (i = 0; i < 3; i++) { | |
717 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
718 | type, 1, &vals[i]); | |
719 | if (len >= PAGE_SIZE) | |
720 | return -EFBIG; | |
721 | if (i < 2) | |
722 | len += snprintf(buf + len, PAGE_SIZE - len, | |
723 | " "); | |
724 | else | |
725 | len += snprintf(buf + len, PAGE_SIZE - len, | |
726 | "]\n"); | |
727 | if (len >= PAGE_SIZE) | |
728 | return -EFBIG; | |
729 | } | |
730 | break; | |
731 | default: | |
732 | for (i = 0; i < 3; i++) { | |
733 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
734 | type, 2, &vals[i * 2]); | |
735 | if (len >= PAGE_SIZE) | |
736 | return -EFBIG; | |
737 | if (i < 2) | |
738 | len += snprintf(buf + len, PAGE_SIZE - len, | |
739 | " "); | |
740 | else | |
741 | len += snprintf(buf + len, PAGE_SIZE - len, | |
742 | "]\n"); | |
743 | if (len >= PAGE_SIZE) | |
744 | return -EFBIG; | |
745 | } | |
746 | } | |
747 | ||
748 | return len; | |
749 | } | |
750 | ||
751 | static ssize_t iio_read_channel_info_avail(struct device *dev, | |
752 | struct device_attribute *attr, | |
753 | char *buf) | |
754 | { | |
755 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
756 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
757 | const int *vals; | |
758 | int ret; | |
759 | int length; | |
760 | int type; | |
761 | ||
762 | ret = indio_dev->info->read_avail(indio_dev, this_attr->c, | |
763 | &vals, &type, &length, | |
764 | this_attr->address); | |
765 | ||
766 | if (ret < 0) | |
767 | return ret; | |
768 | switch (ret) { | |
769 | case IIO_AVAIL_LIST: | |
770 | return iio_format_avail_list(buf, vals, type, length); | |
771 | case IIO_AVAIL_RANGE: | |
772 | return iio_format_avail_range(buf, vals, type); | |
773 | default: | |
774 | return -EINVAL; | |
775 | } | |
776 | } | |
777 | ||
6807d721 | 778 | /** |
b8528224 | 779 | * __iio_str_to_fixpoint() - Parse a fixed-point number from a string |
6807d721 LPC |
780 | * @str: The string to parse |
781 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
782 | * @integer: The integer part of the number | |
783 | * @fract: The fractional part of the number | |
b8528224 | 784 | * @scale_db: True if this should parse as dB |
6807d721 LPC |
785 | * |
786 | * Returns 0 on success, or a negative error code if the string could not be | |
787 | * parsed. | |
788 | */ | |
b8528224 BB |
789 | static int __iio_str_to_fixpoint(const char *str, int fract_mult, |
790 | int *integer, int *fract, bool scale_db) | |
6807d721 LPC |
791 | { |
792 | int i = 0, f = 0; | |
793 | bool integer_part = true, negative = false; | |
794 | ||
f47dff32 SN |
795 | if (fract_mult == 0) { |
796 | *fract = 0; | |
797 | ||
798 | return kstrtoint(str, 0, integer); | |
799 | } | |
800 | ||
6807d721 LPC |
801 | if (str[0] == '-') { |
802 | negative = true; | |
803 | str++; | |
804 | } else if (str[0] == '+') { | |
805 | str++; | |
806 | } | |
807 | ||
808 | while (*str) { | |
809 | if ('0' <= *str && *str <= '9') { | |
810 | if (integer_part) { | |
811 | i = i * 10 + *str - '0'; | |
812 | } else { | |
813 | f += fract_mult * (*str - '0'); | |
814 | fract_mult /= 10; | |
815 | } | |
816 | } else if (*str == '\n') { | |
817 | if (*(str + 1) == '\0') | |
818 | break; | |
819 | else | |
820 | return -EINVAL; | |
b8528224 BB |
821 | } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) { |
822 | /* Ignore the dB suffix */ | |
823 | str += sizeof(" dB") - 1; | |
824 | continue; | |
825 | } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) { | |
826 | /* Ignore the dB suffix */ | |
827 | str += sizeof("dB") - 1; | |
828 | continue; | |
6807d721 LPC |
829 | } else if (*str == '.' && integer_part) { |
830 | integer_part = false; | |
831 | } else { | |
832 | return -EINVAL; | |
833 | } | |
834 | str++; | |
835 | } | |
836 | ||
837 | if (negative) { | |
838 | if (i) | |
839 | i = -i; | |
840 | else | |
841 | f = -f; | |
842 | } | |
843 | ||
844 | *integer = i; | |
845 | *fract = f; | |
846 | ||
847 | return 0; | |
848 | } | |
b8528224 BB |
849 | |
850 | /** | |
851 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
852 | * @str: The string to parse | |
853 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
854 | * @integer: The integer part of the number | |
855 | * @fract: The fractional part of the number | |
856 | * | |
857 | * Returns 0 on success, or a negative error code if the string could not be | |
858 | * parsed. | |
859 | */ | |
860 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
861 | int *integer, int *fract) | |
862 | { | |
863 | return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false); | |
864 | } | |
6807d721 LPC |
865 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); |
866 | ||
1d892719 JC |
867 | static ssize_t iio_write_channel_info(struct device *dev, |
868 | struct device_attribute *attr, | |
869 | const char *buf, | |
870 | size_t len) | |
871 | { | |
e53f5ac5 | 872 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 873 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 | 874 | int ret, fract_mult = 100000; |
8cb34036 AM |
875 | int integer, fract = 0; |
876 | bool is_char = false; | |
b8528224 | 877 | bool scale_db = false; |
1d892719 JC |
878 | |
879 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 880 | if (!indio_dev->info->write_raw) |
1d892719 | 881 | return -EINVAL; |
5c04af04 MH |
882 | |
883 | if (indio_dev->info->write_raw_get_fmt) | |
884 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
885 | this_attr->c, this_attr->address)) { | |
f47dff32 SN |
886 | case IIO_VAL_INT: |
887 | fract_mult = 0; | |
888 | break; | |
b8528224 BB |
889 | case IIO_VAL_INT_PLUS_MICRO_DB: |
890 | scale_db = true; | |
891 | /* fall through */ | |
5c04af04 MH |
892 | case IIO_VAL_INT_PLUS_MICRO: |
893 | fract_mult = 100000; | |
894 | break; | |
895 | case IIO_VAL_INT_PLUS_NANO: | |
896 | fract_mult = 100000000; | |
897 | break; | |
8cb34036 AM |
898 | case IIO_VAL_CHAR: |
899 | is_char = true; | |
900 | break; | |
5c04af04 MH |
901 | default: |
902 | return -EINVAL; | |
903 | } | |
904 | ||
8cb34036 AM |
905 | if (is_char) { |
906 | char ch; | |
907 | ||
908 | if (sscanf(buf, "%c", &ch) != 1) | |
909 | return -EINVAL; | |
910 | integer = ch; | |
911 | } else { | |
912 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); | |
913 | if (ret) | |
914 | return ret; | |
915 | } | |
b8528224 BB |
916 | ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract, |
917 | scale_db); | |
918 | if (ret) | |
919 | return ret; | |
1d892719 | 920 | |
6fe8135f | 921 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 922 | integer, fract, this_attr->address); |
1d892719 JC |
923 | if (ret) |
924 | return ret; | |
925 | ||
926 | return len; | |
927 | } | |
928 | ||
df9c1c42 | 929 | static |
1d892719 JC |
930 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
931 | const char *postfix, | |
932 | struct iio_chan_spec const *chan, | |
933 | ssize_t (*readfunc)(struct device *dev, | |
934 | struct device_attribute *attr, | |
935 | char *buf), | |
936 | ssize_t (*writefunc)(struct device *dev, | |
937 | struct device_attribute *attr, | |
938 | const char *buf, | |
939 | size_t len), | |
3704432f | 940 | enum iio_shared_by shared_by) |
1d892719 | 941 | { |
3704432f | 942 | int ret = 0; |
7bbcf7e1 | 943 | char *name = NULL; |
3704432f | 944 | char *full_postfix; |
1d892719 | 945 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 946 | |
ade7ef7b | 947 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 948 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
949 | if (chan->extend_name) |
950 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
951 | iio_modifier_names[chan | |
952 | ->channel2], | |
953 | chan->extend_name, | |
954 | postfix); | |
955 | else | |
956 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
957 | iio_modifier_names[chan | |
958 | ->channel2], | |
959 | postfix); | |
960 | } else { | |
77bfa8ba | 961 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
962 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
963 | else | |
964 | full_postfix = kasprintf(GFP_KERNEL, | |
965 | "%s_%s", | |
966 | chan->extend_name, | |
967 | postfix); | |
968 | } | |
3704432f JC |
969 | if (full_postfix == NULL) |
970 | return -ENOMEM; | |
1d892719 | 971 | |
4abf6f8b | 972 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 973 | switch (shared_by) { |
c006ec83 | 974 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 975 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
976 | break; |
977 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 978 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
979 | iio_direction[chan->output], |
980 | full_postfix); | |
981 | break; | |
3704432f | 982 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 983 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
984 | iio_direction[chan->output], |
985 | iio_chan_type_name_spec[chan->type], | |
986 | iio_chan_type_name_spec[chan->type], | |
987 | full_postfix); | |
3704432f JC |
988 | break; |
989 | case IIO_SEPARATE: | |
990 | if (!chan->indexed) { | |
231bfe53 | 991 | WARN(1, "Differential channels must be indexed\n"); |
3704432f JC |
992 | ret = -EINVAL; |
993 | goto error_free_full_postfix; | |
994 | } | |
7bbcf7e1 | 995 | name = kasprintf(GFP_KERNEL, |
3704432f | 996 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
997 | iio_direction[chan->output], |
998 | iio_chan_type_name_spec[chan->type], | |
999 | chan->channel, | |
1000 | iio_chan_type_name_spec[chan->type], | |
1001 | chan->channel2, | |
1002 | full_postfix); | |
3704432f | 1003 | break; |
ade7ef7b JC |
1004 | } |
1005 | } else { /* Single ended */ | |
3704432f | 1006 | switch (shared_by) { |
c006ec83 | 1007 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 1008 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
1009 | break; |
1010 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 1011 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
1012 | iio_direction[chan->output], |
1013 | full_postfix); | |
1014 | break; | |
3704432f | 1015 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 1016 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
1017 | iio_direction[chan->output], |
1018 | iio_chan_type_name_spec[chan->type], | |
1019 | full_postfix); | |
3704432f JC |
1020 | break; |
1021 | ||
1022 | case IIO_SEPARATE: | |
1023 | if (chan->indexed) | |
7bbcf7e1 | 1024 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
1025 | iio_direction[chan->output], |
1026 | iio_chan_type_name_spec[chan->type], | |
1027 | chan->channel, | |
1028 | full_postfix); | |
1029 | else | |
7bbcf7e1 | 1030 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
1031 | iio_direction[chan->output], |
1032 | iio_chan_type_name_spec[chan->type], | |
1033 | full_postfix); | |
1034 | break; | |
1035 | } | |
ade7ef7b | 1036 | } |
7bbcf7e1 | 1037 | if (name == NULL) { |
1d892719 JC |
1038 | ret = -ENOMEM; |
1039 | goto error_free_full_postfix; | |
1040 | } | |
7bbcf7e1 | 1041 | dev_attr->attr.name = name; |
1d892719 JC |
1042 | |
1043 | if (readfunc) { | |
1044 | dev_attr->attr.mode |= S_IRUGO; | |
1045 | dev_attr->show = readfunc; | |
1046 | } | |
1047 | ||
1048 | if (writefunc) { | |
1049 | dev_attr->attr.mode |= S_IWUSR; | |
1050 | dev_attr->store = writefunc; | |
1051 | } | |
7bbcf7e1 | 1052 | |
1d892719 JC |
1053 | error_free_full_postfix: |
1054 | kfree(full_postfix); | |
3704432f | 1055 | |
1d892719 JC |
1056 | return ret; |
1057 | } | |
1058 | ||
df9c1c42 | 1059 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
1060 | { |
1061 | kfree(dev_attr->attr.name); | |
1062 | } | |
1063 | ||
1064 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
1065 | struct iio_chan_spec const *chan, |
1066 | ssize_t (*readfunc)(struct device *dev, | |
1067 | struct device_attribute *attr, | |
1068 | char *buf), | |
1069 | ssize_t (*writefunc)(struct device *dev, | |
1070 | struct device_attribute *attr, | |
1071 | const char *buf, | |
1072 | size_t len), | |
e614a54b | 1073 | u64 mask, |
3704432f | 1074 | enum iio_shared_by shared_by, |
1d892719 JC |
1075 | struct device *dev, |
1076 | struct list_head *attr_list) | |
1077 | { | |
1078 | int ret; | |
1079 | struct iio_dev_attr *iio_attr, *t; | |
1080 | ||
670c1103 | 1081 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
1082 | if (iio_attr == NULL) |
1083 | return -ENOMEM; | |
1d892719 JC |
1084 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
1085 | postfix, chan, | |
3704432f | 1086 | readfunc, writefunc, shared_by); |
1d892719 JC |
1087 | if (ret) |
1088 | goto error_iio_dev_attr_free; | |
1089 | iio_attr->c = chan; | |
1090 | iio_attr->address = mask; | |
1091 | list_for_each_entry(t, attr_list, l) | |
1092 | if (strcmp(t->dev_attr.attr.name, | |
1093 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 1094 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
1095 | dev_err(dev, "tried to double register : %s\n", |
1096 | t->dev_attr.attr.name); | |
1097 | ret = -EBUSY; | |
1098 | goto error_device_attr_deinit; | |
1099 | } | |
1d892719 JC |
1100 | list_add(&iio_attr->l, attr_list); |
1101 | ||
1102 | return 0; | |
1103 | ||
1104 | error_device_attr_deinit: | |
1105 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
1106 | error_iio_dev_attr_free: | |
1107 | kfree(iio_attr); | |
1d892719 JC |
1108 | return ret; |
1109 | } | |
1110 | ||
3704432f JC |
1111 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
1112 | struct iio_chan_spec const *chan, | |
1113 | enum iio_shared_by shared_by, | |
1114 | const long *infomask) | |
1d892719 | 1115 | { |
3704432f | 1116 | int i, ret, attrcount = 0; |
1d892719 | 1117 | |
1016d567 | 1118 | for_each_set_bit(i, infomask, sizeof(*infomask)*8) { |
ef4b4856 JC |
1119 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1120 | return -EINVAL; | |
8655cc49 JC |
1121 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
1122 | chan, | |
1123 | &iio_read_channel_info, | |
1124 | &iio_write_channel_info, | |
1125 | i, | |
3704432f | 1126 | shared_by, |
8655cc49 JC |
1127 | &indio_dev->dev, |
1128 | &indio_dev->channel_attr_list); | |
3704432f | 1129 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 1130 | continue; |
3704432f JC |
1131 | else if (ret < 0) |
1132 | return ret; | |
8655cc49 JC |
1133 | attrcount++; |
1134 | } | |
5f420b42 | 1135 | |
3704432f JC |
1136 | return attrcount; |
1137 | } | |
1138 | ||
51239600 JC |
1139 | static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev, |
1140 | struct iio_chan_spec const *chan, | |
1141 | enum iio_shared_by shared_by, | |
1142 | const long *infomask) | |
1143 | { | |
1144 | int i, ret, attrcount = 0; | |
1145 | char *avail_postfix; | |
1146 | ||
1016d567 | 1147 | for_each_set_bit(i, infomask, sizeof(*infomask) * 8) { |
936d3e53 YX |
1148 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1149 | return -EINVAL; | |
51239600 JC |
1150 | avail_postfix = kasprintf(GFP_KERNEL, |
1151 | "%s_available", | |
1152 | iio_chan_info_postfix[i]); | |
1153 | if (!avail_postfix) | |
1154 | return -ENOMEM; | |
1155 | ||
1156 | ret = __iio_add_chan_devattr(avail_postfix, | |
1157 | chan, | |
1158 | &iio_read_channel_info_avail, | |
1159 | NULL, | |
1160 | i, | |
1161 | shared_by, | |
1162 | &indio_dev->dev, | |
1163 | &indio_dev->channel_attr_list); | |
1164 | kfree(avail_postfix); | |
1165 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) | |
1166 | continue; | |
1167 | else if (ret < 0) | |
1168 | return ret; | |
1169 | attrcount++; | |
1170 | } | |
1171 | ||
1172 | return attrcount; | |
1173 | } | |
1174 | ||
3704432f JC |
1175 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1176 | struct iio_chan_spec const *chan) | |
1177 | { | |
1178 | int ret, attrcount = 0; | |
1179 | const struct iio_chan_spec_ext_info *ext_info; | |
1180 | ||
1181 | if (chan->channel < 0) | |
1182 | return 0; | |
1183 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
1184 | IIO_SEPARATE, | |
1185 | &chan->info_mask_separate); | |
1186 | if (ret < 0) | |
1187 | return ret; | |
1188 | attrcount += ret; | |
1189 | ||
51239600 JC |
1190 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1191 | IIO_SEPARATE, | |
1192 | &chan-> | |
1193 | info_mask_separate_available); | |
1194 | if (ret < 0) | |
1195 | return ret; | |
1196 | attrcount += ret; | |
1197 | ||
3704432f JC |
1198 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1199 | IIO_SHARED_BY_TYPE, | |
1200 | &chan->info_mask_shared_by_type); | |
1201 | if (ret < 0) | |
1202 | return ret; | |
1203 | attrcount += ret; | |
1204 | ||
51239600 JC |
1205 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1206 | IIO_SHARED_BY_TYPE, | |
1207 | &chan-> | |
1208 | info_mask_shared_by_type_available); | |
1209 | if (ret < 0) | |
1210 | return ret; | |
1211 | attrcount += ret; | |
1212 | ||
c006ec83 JC |
1213 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1214 | IIO_SHARED_BY_DIR, | |
1215 | &chan->info_mask_shared_by_dir); | |
1216 | if (ret < 0) | |
1217 | return ret; | |
1218 | attrcount += ret; | |
1219 | ||
51239600 JC |
1220 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1221 | IIO_SHARED_BY_DIR, | |
1222 | &chan->info_mask_shared_by_dir_available); | |
1223 | if (ret < 0) | |
1224 | return ret; | |
1225 | attrcount += ret; | |
1226 | ||
c006ec83 JC |
1227 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1228 | IIO_SHARED_BY_ALL, | |
1229 | &chan->info_mask_shared_by_all); | |
1230 | if (ret < 0) | |
1231 | return ret; | |
1232 | attrcount += ret; | |
1233 | ||
51239600 JC |
1234 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1235 | IIO_SHARED_BY_ALL, | |
1236 | &chan->info_mask_shared_by_all_available); | |
1237 | if (ret < 0) | |
1238 | return ret; | |
1239 | attrcount += ret; | |
1240 | ||
5f420b42 LPC |
1241 | if (chan->ext_info) { |
1242 | unsigned int i = 0; | |
1243 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
1244 | ret = __iio_add_chan_devattr(ext_info->name, | |
1245 | chan, | |
1246 | ext_info->read ? | |
1247 | &iio_read_channel_ext_info : NULL, | |
1248 | ext_info->write ? | |
1249 | &iio_write_channel_ext_info : NULL, | |
1250 | i, | |
1251 | ext_info->shared, | |
1252 | &indio_dev->dev, | |
1253 | &indio_dev->channel_attr_list); | |
1254 | i++; | |
1255 | if (ret == -EBUSY && ext_info->shared) | |
1256 | continue; | |
1257 | ||
1258 | if (ret) | |
3704432f | 1259 | return ret; |
5f420b42 LPC |
1260 | |
1261 | attrcount++; | |
1262 | } | |
1263 | } | |
1264 | ||
3704432f | 1265 | return attrcount; |
1d892719 JC |
1266 | } |
1267 | ||
84088ebd LPC |
1268 | /** |
1269 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
1270 | * @attr_list: List of IIO device attributes | |
1271 | * | |
1272 | * This function frees the memory allocated for each of the IIO device | |
c1b03ab5 | 1273 | * attributes in the list. |
84088ebd LPC |
1274 | */ |
1275 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 1276 | { |
84088ebd LPC |
1277 | struct iio_dev_attr *p, *n; |
1278 | ||
1279 | list_for_each_entry_safe(p, n, attr_list, l) { | |
1280 | kfree(p->dev_attr.attr.name); | |
c1b03ab5 | 1281 | list_del(&p->l); |
84088ebd LPC |
1282 | kfree(p); |
1283 | } | |
1d892719 JC |
1284 | } |
1285 | ||
1b732888 JC |
1286 | static ssize_t iio_show_dev_name(struct device *dev, |
1287 | struct device_attribute *attr, | |
1288 | char *buf) | |
1289 | { | |
e53f5ac5 | 1290 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 1291 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
1292 | } |
1293 | ||
1294 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
1295 | ||
2c3d0c9f PR |
1296 | static ssize_t iio_show_dev_label(struct device *dev, |
1297 | struct device_attribute *attr, | |
1298 | char *buf) | |
1299 | { | |
1300 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
1301 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label); | |
1302 | } | |
1303 | ||
1304 | static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL); | |
1305 | ||
bc2b7dab GB |
1306 | static ssize_t iio_show_timestamp_clock(struct device *dev, |
1307 | struct device_attribute *attr, | |
1308 | char *buf) | |
1309 | { | |
1310 | const struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
1311 | const clockid_t clk = iio_device_get_clock(indio_dev); | |
1312 | const char *name; | |
1313 | ssize_t sz; | |
1314 | ||
1315 | switch (clk) { | |
1316 | case CLOCK_REALTIME: | |
1317 | name = "realtime\n"; | |
1318 | sz = sizeof("realtime\n"); | |
1319 | break; | |
1320 | case CLOCK_MONOTONIC: | |
1321 | name = "monotonic\n"; | |
1322 | sz = sizeof("monotonic\n"); | |
1323 | break; | |
1324 | case CLOCK_MONOTONIC_RAW: | |
1325 | name = "monotonic_raw\n"; | |
1326 | sz = sizeof("monotonic_raw\n"); | |
1327 | break; | |
1328 | case CLOCK_REALTIME_COARSE: | |
1329 | name = "realtime_coarse\n"; | |
1330 | sz = sizeof("realtime_coarse\n"); | |
1331 | break; | |
1332 | case CLOCK_MONOTONIC_COARSE: | |
1333 | name = "monotonic_coarse\n"; | |
1334 | sz = sizeof("monotonic_coarse\n"); | |
1335 | break; | |
1336 | case CLOCK_BOOTTIME: | |
1337 | name = "boottime\n"; | |
1338 | sz = sizeof("boottime\n"); | |
1339 | break; | |
1340 | case CLOCK_TAI: | |
1341 | name = "tai\n"; | |
1342 | sz = sizeof("tai\n"); | |
1343 | break; | |
1344 | default: | |
1345 | BUG(); | |
1346 | } | |
1347 | ||
1348 | memcpy(buf, name, sz); | |
1349 | return sz; | |
1350 | } | |
1351 | ||
1352 | static ssize_t iio_store_timestamp_clock(struct device *dev, | |
1353 | struct device_attribute *attr, | |
1354 | const char *buf, size_t len) | |
1355 | { | |
1356 | clockid_t clk; | |
1357 | int ret; | |
1358 | ||
1359 | if (sysfs_streq(buf, "realtime")) | |
1360 | clk = CLOCK_REALTIME; | |
1361 | else if (sysfs_streq(buf, "monotonic")) | |
1362 | clk = CLOCK_MONOTONIC; | |
1363 | else if (sysfs_streq(buf, "monotonic_raw")) | |
1364 | clk = CLOCK_MONOTONIC_RAW; | |
1365 | else if (sysfs_streq(buf, "realtime_coarse")) | |
1366 | clk = CLOCK_REALTIME_COARSE; | |
1367 | else if (sysfs_streq(buf, "monotonic_coarse")) | |
1368 | clk = CLOCK_MONOTONIC_COARSE; | |
1369 | else if (sysfs_streq(buf, "boottime")) | |
1370 | clk = CLOCK_BOOTTIME; | |
1371 | else if (sysfs_streq(buf, "tai")) | |
1372 | clk = CLOCK_TAI; | |
1373 | else | |
1374 | return -EINVAL; | |
1375 | ||
1376 | ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); | |
1377 | if (ret) | |
1378 | return ret; | |
1379 | ||
1380 | return len; | |
1381 | } | |
1382 | ||
1383 | static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, | |
1384 | iio_show_timestamp_clock, iio_store_timestamp_clock); | |
1385 | ||
f8c6f4e9 | 1386 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 1387 | { |
26d25ae3 | 1388 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 1389 | struct iio_dev_attr *p; |
bc2b7dab | 1390 | struct attribute **attr, *clk = NULL; |
1d892719 | 1391 | |
26d25ae3 | 1392 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
1393 | if (indio_dev->info->attrs) { |
1394 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
1395 | while (*attr++ != NULL) |
1396 | attrcount_orig++; | |
847ec80b | 1397 | } |
26d25ae3 | 1398 | attrcount = attrcount_orig; |
1d892719 JC |
1399 | /* |
1400 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 1401 | * not need to be initialized if its name is NULL. |
1d892719 | 1402 | */ |
f8c6f4e9 JC |
1403 | if (indio_dev->channels) |
1404 | for (i = 0; i < indio_dev->num_channels; i++) { | |
bc2b7dab GB |
1405 | const struct iio_chan_spec *chan = |
1406 | &indio_dev->channels[i]; | |
1407 | ||
1408 | if (chan->type == IIO_TIMESTAMP) | |
1409 | clk = &dev_attr_current_timestamp_clock.attr; | |
1410 | ||
1411 | ret = iio_device_add_channel_sysfs(indio_dev, chan); | |
1d892719 JC |
1412 | if (ret < 0) |
1413 | goto error_clear_attrs; | |
26d25ae3 | 1414 | attrcount += ret; |
1d892719 | 1415 | } |
26d25ae3 | 1416 | |
bc2b7dab GB |
1417 | if (indio_dev->event_interface) |
1418 | clk = &dev_attr_current_timestamp_clock.attr; | |
1419 | ||
f8c6f4e9 | 1420 | if (indio_dev->name) |
26d25ae3 | 1421 | attrcount++; |
2c3d0c9f PR |
1422 | if (indio_dev->label) |
1423 | attrcount++; | |
bc2b7dab GB |
1424 | if (clk) |
1425 | attrcount++; | |
26d25ae3 | 1426 | |
d83fb184 TM |
1427 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
1428 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
1429 | GFP_KERNEL); | |
f8c6f4e9 | 1430 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
1431 | ret = -ENOMEM; |
1432 | goto error_clear_attrs; | |
1b732888 | 1433 | } |
26d25ae3 | 1434 | /* Copy across original attributes */ |
f8c6f4e9 JC |
1435 | if (indio_dev->info->attrs) |
1436 | memcpy(indio_dev->chan_attr_group.attrs, | |
1437 | indio_dev->info->attrs->attrs, | |
1438 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
1439 | *attrcount_orig); |
1440 | attrn = attrcount_orig; | |
1441 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
1442 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
1443 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
1444 | if (indio_dev->name) | |
1445 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
2c3d0c9f PR |
1446 | if (indio_dev->label) |
1447 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr; | |
bc2b7dab GB |
1448 | if (clk) |
1449 | indio_dev->chan_attr_group.attrs[attrn++] = clk; | |
26d25ae3 | 1450 | |
f8c6f4e9 JC |
1451 | indio_dev->groups[indio_dev->groupcounter++] = |
1452 | &indio_dev->chan_attr_group; | |
26d25ae3 | 1453 | |
1d892719 | 1454 | return 0; |
1b732888 | 1455 | |
1d892719 | 1456 | error_clear_attrs: |
84088ebd | 1457 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 1458 | |
26d25ae3 | 1459 | return ret; |
847ec80b JC |
1460 | } |
1461 | ||
f8c6f4e9 | 1462 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 1463 | { |
1d892719 | 1464 | |
84088ebd | 1465 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 1466 | kfree(indio_dev->chan_attr_group.attrs); |
c1b03ab5 | 1467 | indio_dev->chan_attr_group.attrs = NULL; |
847ec80b JC |
1468 | } |
1469 | ||
847ec80b JC |
1470 | static void iio_dev_release(struct device *device) |
1471 | { | |
e53f5ac5 | 1472 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
d89e119a | 1473 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
f8c6f4e9 JC |
1474 | iio_device_unregister_trigger_consumer(indio_dev); |
1475 | iio_device_unregister_eventset(indio_dev); | |
1476 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 1477 | |
9e69c935 LPC |
1478 | iio_buffer_put(indio_dev->buffer); |
1479 | ||
e407fd65 LPC |
1480 | ida_simple_remove(&iio_ida, indio_dev->id); |
1481 | kfree(indio_dev); | |
847ec80b JC |
1482 | } |
1483 | ||
17d82b47 | 1484 | struct device_type iio_device_type = { |
847ec80b JC |
1485 | .name = "iio_device", |
1486 | .release = iio_dev_release, | |
1487 | }; | |
1488 | ||
a7e57dce SK |
1489 | /** |
1490 | * iio_device_alloc() - allocate an iio_dev from a driver | |
1491 | * @sizeof_priv: Space to allocate for private structure. | |
1492 | **/ | |
7cbb7537 | 1493 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 1494 | { |
6f7c8ee5 JC |
1495 | struct iio_dev *dev; |
1496 | size_t alloc_size; | |
1497 | ||
1498 | alloc_size = sizeof(struct iio_dev); | |
1499 | if (sizeof_priv) { | |
1500 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
1501 | alloc_size += sizeof_priv; | |
1502 | } | |
1503 | /* ensure 32-byte alignment of whole construct ? */ | |
1504 | alloc_size += IIO_ALIGN - 1; | |
1505 | ||
1506 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
1507 | |
1508 | if (dev) { | |
26d25ae3 | 1509 | dev->dev.groups = dev->groups; |
17d82b47 | 1510 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 1511 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
1512 | device_initialize(&dev->dev); |
1513 | dev_set_drvdata(&dev->dev, (void *)dev); | |
1514 | mutex_init(&dev->mlock); | |
ac917a81 | 1515 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 1516 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
1517 | |
1518 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
1519 | if (dev->id < 0) { | |
1520 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 1521 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
1522 | kfree(dev); |
1523 | return NULL; | |
1524 | } | |
1525 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 1526 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
1527 | } |
1528 | ||
1529 | return dev; | |
1530 | } | |
7cbb7537 | 1531 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1532 | |
a7e57dce SK |
1533 | /** |
1534 | * iio_device_free() - free an iio_dev from a driver | |
1535 | * @dev: the iio_dev associated with the device | |
1536 | **/ | |
7cbb7537 | 1537 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1538 | { |
e407fd65 LPC |
1539 | if (dev) |
1540 | put_device(&dev->dev); | |
847ec80b | 1541 | } |
7cbb7537 | 1542 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1543 | |
9dabaf5e GS |
1544 | static void devm_iio_device_release(struct device *dev, void *res) |
1545 | { | |
1546 | iio_device_free(*(struct iio_dev **)res); | |
1547 | } | |
1548 | ||
70e48348 | 1549 | int devm_iio_device_match(struct device *dev, void *res, void *data) |
9dabaf5e GS |
1550 | { |
1551 | struct iio_dev **r = res; | |
1552 | if (!r || !*r) { | |
1553 | WARN_ON(!r || !*r); | |
1554 | return 0; | |
1555 | } | |
1556 | return *r == data; | |
1557 | } | |
70e48348 | 1558 | EXPORT_SYMBOL_GPL(devm_iio_device_match); |
9dabaf5e | 1559 | |
a7e57dce SK |
1560 | /** |
1561 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1562 | * @dev: Device to allocate iio_dev for | |
1563 | * @sizeof_priv: Space to allocate for private structure. | |
1564 | * | |
1565 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1566 | * automatically freed on driver detach. | |
1567 | * | |
1568 | * If an iio_dev allocated with this function needs to be freed separately, | |
1569 | * devm_iio_device_free() must be used. | |
1570 | * | |
1571 | * RETURNS: | |
1572 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1573 | */ | |
9dabaf5e GS |
1574 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1575 | { | |
1576 | struct iio_dev **ptr, *iio_dev; | |
1577 | ||
1578 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1579 | GFP_KERNEL); | |
1580 | if (!ptr) | |
1581 | return NULL; | |
1582 | ||
9dabaf5e GS |
1583 | iio_dev = iio_device_alloc(sizeof_priv); |
1584 | if (iio_dev) { | |
1585 | *ptr = iio_dev; | |
1586 | devres_add(dev, ptr); | |
1587 | } else { | |
1588 | devres_free(ptr); | |
1589 | } | |
1590 | ||
1591 | return iio_dev; | |
1592 | } | |
1593 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1594 | ||
a7e57dce SK |
1595 | /** |
1596 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1597 | * @dev: Device this iio_dev belongs to | |
1598 | * @iio_dev: the iio_dev associated with the device | |
1599 | * | |
1600 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1601 | */ | |
9dabaf5e GS |
1602 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1603 | { | |
1604 | int rc; | |
1605 | ||
1606 | rc = devres_release(dev, devm_iio_device_release, | |
1607 | devm_iio_device_match, iio_dev); | |
1608 | WARN_ON(rc); | |
1609 | } | |
1610 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1611 | ||
1aa04278 | 1612 | /** |
14555b14 | 1613 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6 CO |
1614 | * @inode: Inode structure for identifying the device in the file system |
1615 | * @filp: File structure for iio device used to keep and later access | |
1616 | * private data | |
1617 | * | |
1618 | * Return: 0 on success or -EBUSY if the device is already opened | |
1aa04278 JC |
1619 | **/ |
1620 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1621 | { | |
f8c6f4e9 | 1622 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1623 | struct iio_dev, chrdev); |
bb01443e LPC |
1624 | |
1625 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1626 | return -EBUSY; | |
1627 | ||
cadc2125 LPC |
1628 | iio_device_get(indio_dev); |
1629 | ||
f8c6f4e9 | 1630 | filp->private_data = indio_dev; |
30eb82f0 | 1631 | |
79335140 | 1632 | return 0; |
1aa04278 JC |
1633 | } |
1634 | ||
1635 | /** | |
14555b14 | 1636 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6 CO |
1637 | * @inode: Inode structure pointer for the char device |
1638 | * @filp: File structure pointer for the char device | |
1639 | * | |
1640 | * Return: 0 for successful release | |
1641 | */ | |
1aa04278 JC |
1642 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1643 | { | |
bb01443e LPC |
1644 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1645 | struct iio_dev, chrdev); | |
bb01443e | 1646 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1647 | iio_device_put(indio_dev); |
1648 | ||
1aa04278 JC |
1649 | return 0; |
1650 | } | |
1651 | ||
1652 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1653 | * event related */ | |
1654 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1655 | { | |
1656 | struct iio_dev *indio_dev = filp->private_data; | |
1657 | int __user *ip = (int __user *)arg; | |
1658 | int fd; | |
1659 | ||
f18e7a06 LPC |
1660 | if (!indio_dev->info) |
1661 | return -ENODEV; | |
1662 | ||
1aa04278 JC |
1663 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1664 | fd = iio_event_getfd(indio_dev); | |
3f9059b7 LW |
1665 | if (fd < 0) |
1666 | return fd; | |
1aa04278 JC |
1667 | if (copy_to_user(ip, &fd, sizeof(fd))) |
1668 | return -EFAULT; | |
1669 | return 0; | |
1670 | } | |
1671 | return -EINVAL; | |
1672 | } | |
1673 | ||
14555b14 | 1674 | static const struct file_operations iio_buffer_fileops = { |
f6d4033d | 1675 | .read = iio_buffer_read_outer_addr, |
1aa04278 JC |
1676 | .release = iio_chrdev_release, |
1677 | .open = iio_chrdev_open, | |
14555b14 | 1678 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1679 | .owner = THIS_MODULE, |
1680 | .llseek = noop_llseek, | |
1681 | .unlocked_ioctl = iio_ioctl, | |
1832f2d8 | 1682 | .compat_ioctl = compat_ptr_ioctl, |
1aa04278 JC |
1683 | }; |
1684 | ||
8f5d8727 VD |
1685 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1686 | { | |
1687 | int i, j; | |
1688 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1689 | ||
1690 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1691 | return 0; | |
1692 | ||
1693 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1694 | if (channels[i].scan_index < 0) | |
1695 | continue; | |
1696 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1697 | if (channels[i].scan_index == channels[j].scan_index) { | |
1698 | dev_err(&indio_dev->dev, | |
1699 | "Duplicate scan index %d\n", | |
1700 | channels[i].scan_index); | |
1701 | return -EINVAL; | |
1702 | } | |
1703 | } | |
1704 | ||
1705 | return 0; | |
1706 | } | |
1707 | ||
0f1acee5 MH |
1708 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1709 | ||
63b19547 | 1710 | int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) |
847ec80b JC |
1711 | { |
1712 | int ret; | |
1713 | ||
63b19547 | 1714 | indio_dev->driver_module = this_mod; |
17d82b47 GR |
1715 | /* If the calling driver did not initialize of_node, do it here */ |
1716 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1717 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1718 | ||
2c3d0c9f PR |
1719 | indio_dev->label = of_get_property(indio_dev->dev.of_node, "label", |
1720 | NULL); | |
1721 | ||
8f5d8727 VD |
1722 | ret = iio_check_unique_scan_index(indio_dev); |
1723 | if (ret < 0) | |
1724 | return ret; | |
1725 | ||
d45ebf1f AS |
1726 | if (!indio_dev->info) |
1727 | return -EINVAL; | |
1728 | ||
1aa04278 | 1729 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1730 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1731 | |
8915aaca | 1732 | iio_device_register_debugfs(indio_dev); |
3e1b6c95 LPC |
1733 | |
1734 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1735 | if (ret) { | |
1736 | dev_err(indio_dev->dev.parent, | |
1737 | "Failed to create buffer sysfs interfaces\n"); | |
1738 | goto error_unreg_debugfs; | |
1739 | } | |
1740 | ||
f8c6f4e9 | 1741 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1742 | if (ret) { |
f8c6f4e9 | 1743 | dev_err(indio_dev->dev.parent, |
847ec80b | 1744 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1745 | goto error_buffer_free_sysfs; |
847ec80b | 1746 | } |
f8c6f4e9 | 1747 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1748 | if (ret) { |
f8c6f4e9 | 1749 | dev_err(indio_dev->dev.parent, |
c849d253 | 1750 | "Failed to register event set\n"); |
847ec80b JC |
1751 | goto error_free_sysfs; |
1752 | } | |
d89e119a | 1753 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
f8c6f4e9 | 1754 | iio_device_register_trigger_consumer(indio_dev); |
847ec80b | 1755 | |
0f1acee5 MH |
1756 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1757 | indio_dev->setup_ops == NULL) | |
1758 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1759 | ||
f8c6f4e9 | 1760 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
63b19547 JC |
1761 | |
1762 | indio_dev->chrdev.owner = this_mod; | |
847ec80b | 1763 | |
38923911 | 1764 | ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev); |
0d5b7dae | 1765 | if (ret < 0) |
38923911 | 1766 | goto error_unreg_eventset; |
0d5b7dae LPC |
1767 | |
1768 | return 0; | |
38923911 | 1769 | |
26d25ae3 | 1770 | error_unreg_eventset: |
f8c6f4e9 | 1771 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1772 | error_free_sysfs: |
f8c6f4e9 | 1773 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1774 | error_buffer_free_sysfs: |
1775 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1776 | error_unreg_debugfs: |
1777 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1778 | return ret; |
1779 | } | |
63b19547 | 1780 | EXPORT_SYMBOL(__iio_device_register); |
847ec80b | 1781 | |
a7e57dce SK |
1782 | /** |
1783 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1784 | * @indio_dev: Device structure representing the device. | |
1785 | **/ | |
f8c6f4e9 | 1786 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1787 | { |
38923911 | 1788 | cdev_device_del(&indio_dev->chrdev, &indio_dev->dev); |
a87c82e4 | 1789 | |
7f75591f FG |
1790 | mutex_lock(&indio_dev->info_exist_lock); |
1791 | ||
bc4c9612 | 1792 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1793 | |
a87c82e4 LPC |
1794 | iio_disable_all_buffers(indio_dev); |
1795 | ||
ac917a81 | 1796 | indio_dev->info = NULL; |
d2f0a48f LPC |
1797 | |
1798 | iio_device_wakeup_eventset(indio_dev); | |
1799 | iio_buffer_wakeup_poll(indio_dev); | |
1800 | ||
ac917a81 | 1801 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1802 | |
1803 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1804 | } |
1805 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1806 | |
1807 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1808 | { | |
1809 | iio_device_unregister(*(struct iio_dev **)res); | |
1810 | } | |
1811 | ||
63b19547 JC |
1812 | int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, |
1813 | struct module *this_mod) | |
8caa07c0 SK |
1814 | { |
1815 | struct iio_dev **ptr; | |
1816 | int ret; | |
1817 | ||
1818 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1819 | if (!ptr) | |
1820 | return -ENOMEM; | |
1821 | ||
1822 | *ptr = indio_dev; | |
63b19547 | 1823 | ret = __iio_device_register(indio_dev, this_mod); |
8caa07c0 SK |
1824 | if (!ret) |
1825 | devres_add(dev, ptr); | |
1826 | else | |
1827 | devres_free(ptr); | |
1828 | ||
1829 | return ret; | |
1830 | } | |
63b19547 | 1831 | EXPORT_SYMBOL_GPL(__devm_iio_device_register); |
8caa07c0 SK |
1832 | |
1833 | /** | |
1834 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1835 | * @dev: Device this iio_dev belongs to | |
1836 | * @indio_dev: the iio_dev associated with the device | |
1837 | * | |
1838 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1839 | */ | |
1840 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1841 | { | |
1842 | int rc; | |
1843 | ||
1844 | rc = devres_release(dev, devm_iio_device_unreg, | |
1845 | devm_iio_device_match, indio_dev); | |
1846 | WARN_ON(rc); | |
1847 | } | |
1848 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1849 | ||
08a33805 AS |
1850 | /** |
1851 | * iio_device_claim_direct_mode - Keep device in direct mode | |
1852 | * @indio_dev: the iio_dev associated with the device | |
1853 | * | |
1854 | * If the device is in direct mode it is guaranteed to stay | |
1855 | * that way until iio_device_release_direct_mode() is called. | |
1856 | * | |
1857 | * Use with iio_device_release_direct_mode() | |
1858 | * | |
1859 | * Returns: 0 on success, -EBUSY on failure | |
1860 | */ | |
1861 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) | |
1862 | { | |
1863 | mutex_lock(&indio_dev->mlock); | |
1864 | ||
1865 | if (iio_buffer_enabled(indio_dev)) { | |
1866 | mutex_unlock(&indio_dev->mlock); | |
1867 | return -EBUSY; | |
1868 | } | |
1869 | return 0; | |
1870 | } | |
1871 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); | |
1872 | ||
1873 | /** | |
1874 | * iio_device_release_direct_mode - releases claim on direct mode | |
1875 | * @indio_dev: the iio_dev associated with the device | |
1876 | * | |
1877 | * Release the claim. Device is no longer guaranteed to stay | |
1878 | * in direct mode. | |
1879 | * | |
1880 | * Use with iio_device_claim_direct_mode() | |
1881 | */ | |
1882 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) | |
1883 | { | |
1884 | mutex_unlock(&indio_dev->mlock); | |
1885 | } | |
1886 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); | |
1887 | ||
847ec80b JC |
1888 | subsys_initcall(iio_init); |
1889 | module_exit(iio_exit); | |
1890 | ||
c8b95952 | 1891 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1892 | MODULE_DESCRIPTION("Industrial I/O core"); |
1893 | MODULE_LICENSE("GPL"); |