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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> |
6d4ebd56 | 28 | #include <linux/iio/iio-opaque.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> |
33dd94cb | 34 | #include <linux/iio/buffer_impl.h> |
9dd1cb30 | 35 | |
99698b45 | 36 | /* IDA to assign each registered device a unique id */ |
b156cf70 | 37 | static DEFINE_IDA(iio_ida); |
847ec80b | 38 | |
f625cb97 | 39 | static dev_t iio_devt; |
847ec80b JC |
40 | |
41 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 42 | struct bus_type iio_bus_type = { |
847ec80b | 43 | .name = "iio", |
847ec80b | 44 | }; |
5aaaeba8 | 45 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 46 | |
e553f182 MH |
47 | static struct dentry *iio_debugfs_dentry; |
48 | ||
c6fc8062 JC |
49 | static const char * const iio_direction[] = { |
50 | [0] = "in", | |
51 | [1] = "out", | |
52 | }; | |
53 | ||
ade7ef7b | 54 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 55 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
56 | [IIO_CURRENT] = "current", |
57 | [IIO_POWER] = "power", | |
9bff02f8 | 58 | [IIO_ACCEL] = "accel", |
41ea040c | 59 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 60 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
61 | [IIO_LIGHT] = "illuminance", |
62 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 63 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 64 | [IIO_TEMP] = "temp", |
1d892719 JC |
65 | [IIO_INCLI] = "incli", |
66 | [IIO_ROT] = "rot", | |
1d892719 | 67 | [IIO_ANGL] = "angl", |
9bff02f8 | 68 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 69 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 70 | [IIO_ALTVOLTAGE] = "altvoltage", |
21cd1fab | 71 | [IIO_CCT] = "cct", |
c4f0c693 | 72 | [IIO_PRESSURE] = "pressure", |
ac216aa2 | 73 | [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
55aebeb9 | 74 | [IIO_ACTIVITY] = "activity", |
a88bfe78 | 75 | [IIO_STEPS] = "steps", |
72c66644 | 76 | [IIO_ENERGY] = "energy", |
cc3c9eec | 77 | [IIO_DISTANCE] = "distance", |
5a1a9329 | 78 | [IIO_VELOCITY] = "velocity", |
8ff6b3bc | 79 | [IIO_CONCENTRATION] = "concentration", |
d38d5469 | 80 | [IIO_RESISTANCE] = "resistance", |
ecb3a7cc | 81 | [IIO_PH] = "ph", |
d409404c | 82 | [IIO_UVINDEX] = "uvindex", |
4b9d2090 | 83 | [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
1a8f324a WBG |
84 | [IIO_COUNT] = "count", |
85 | [IIO_INDEX] = "index", | |
571299d0 | 86 | [IIO_GRAVITY] = "gravity", |
3055a6cf | 87 | [IIO_POSITIONRELATIVE] = "positionrelative", |
c73314e6 | 88 | [IIO_PHASE] = "phase", |
17abc9ec | 89 | [IIO_MASSCONCENTRATION] = "massconcentration", |
1d892719 JC |
90 | }; |
91 | ||
330c6c57 | 92 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
93 | [IIO_MOD_X] = "x", |
94 | [IIO_MOD_Y] = "y", | |
95 | [IIO_MOD_Z] = "z", | |
4b8d8015 PM |
96 | [IIO_MOD_X_AND_Y] = "x&y", |
97 | [IIO_MOD_X_AND_Z] = "x&z", | |
98 | [IIO_MOD_Y_AND_Z] = "y&z", | |
99 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", | |
100 | [IIO_MOD_X_OR_Y] = "x|y", | |
101 | [IIO_MOD_X_OR_Z] = "x|z", | |
102 | [IIO_MOD_Y_OR_Z] = "y|z", | |
103 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", | |
8f5879b2 | 104 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 105 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
106 | [IIO_MOD_LIGHT_BOTH] = "both", |
107 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
108 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
109 | [IIO_MOD_LIGHT_RED] = "red", | |
110 | [IIO_MOD_LIGHT_GREEN] = "green", | |
111 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
2c5ff1f9 | 112 | [IIO_MOD_LIGHT_UV] = "uv", |
c0e4e0fd | 113 | [IIO_MOD_LIGHT_DUV] = "duv", |
5082f405 | 114 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
115 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
116 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
117 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
118 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
119 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
120 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
121 | [IIO_MOD_RUNNING] = "running", |
122 | [IIO_MOD_JOGGING] = "jogging", | |
123 | [IIO_MOD_WALKING] = "walking", | |
124 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 125 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1ce87f21 LPC |
126 | [IIO_MOD_I] = "i", |
127 | [IIO_MOD_Q] = "q", | |
8ff6b3bc MR |
128 | [IIO_MOD_CO2] = "co2", |
129 | [IIO_MOD_VOC] = "voc", | |
17abc9ec TD |
130 | [IIO_MOD_PM1] = "pm1", |
131 | [IIO_MOD_PM2P5] = "pm2p5", | |
132 | [IIO_MOD_PM4] = "pm4", | |
133 | [IIO_MOD_PM10] = "pm10", | |
25f02d32 MR |
134 | [IIO_MOD_ETHANOL] = "ethanol", |
135 | [IIO_MOD_H2] = "h2", | |
4ffa22fd | 136 | [IIO_MOD_O2] = "o2", |
1d892719 JC |
137 | }; |
138 | ||
139 | /* relies on pairs of these shared then separate */ | |
140 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
141 | [IIO_CHAN_INFO_RAW] = "raw", |
142 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
143 | [IIO_CHAN_INFO_SCALE] = "scale", |
144 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
145 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
146 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
147 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
148 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
149 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
150 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
151 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
152 | = "filter_low_pass_3db_frequency", | |
3f7f642b MF |
153 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
154 | = "filter_high_pass_3db_frequency", | |
ce85a1cb | 155 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
156 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
157 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 158 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 159 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 160 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 161 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 162 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
d37f6836 | 163 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
2f0ecb7c IT |
164 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
165 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", | |
c8a85854 | 166 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
faaa4495 | 167 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
ddfb97d8 | 168 | [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type", |
dde8ceec | 169 | [IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient", |
1d892719 JC |
170 | }; |
171 | ||
96fb1b67 | 172 | #if defined(CONFIG_DEBUG_FS) |
c9561fd2 | 173 | /* |
96fb1b67 AA |
174 | * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for |
175 | * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined | |
176 | */ | |
177 | struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) | |
178 | { | |
179 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); | |
180 | return iio_dev_opaque->debugfs_dentry; | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry); | |
183 | #endif | |
184 | ||
a7e57dce SK |
185 | /** |
186 | * iio_find_channel_from_si() - get channel from its scan index | |
187 | * @indio_dev: device | |
188 | * @si: scan index to match | |
189 | */ | |
5fb21c82 JC |
190 | const struct iio_chan_spec |
191 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
192 | { | |
193 | int i; | |
194 | ||
195 | for (i = 0; i < indio_dev->num_channels; i++) | |
196 | if (indio_dev->channels[i].scan_index == si) | |
197 | return &indio_dev->channels[i]; | |
198 | return NULL; | |
199 | } | |
200 | ||
847ec80b JC |
201 | /* This turns up an awful lot */ |
202 | ssize_t iio_read_const_attr(struct device *dev, | |
203 | struct device_attribute *attr, | |
204 | char *buf) | |
205 | { | |
206 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
207 | } | |
208 | EXPORT_SYMBOL(iio_read_const_attr); | |
209 | ||
69f0793e GG |
210 | /** |
211 | * iio_device_set_clock() - Set current timestamping clock for the device | |
212 | * @indio_dev: IIO device structure containing the device | |
213 | * @clock_id: timestamping clock posix identifier to set. | |
214 | */ | |
215 | int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) | |
bc2b7dab GB |
216 | { |
217 | int ret; | |
fa83c3ba AA |
218 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
219 | const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface; | |
bc2b7dab GB |
220 | |
221 | ret = mutex_lock_interruptible(&indio_dev->mlock); | |
222 | if (ret) | |
223 | return ret; | |
224 | if ((ev_int && iio_event_enabled(ev_int)) || | |
225 | iio_buffer_enabled(indio_dev)) { | |
226 | mutex_unlock(&indio_dev->mlock); | |
227 | return -EBUSY; | |
228 | } | |
229 | indio_dev->clock_id = clock_id; | |
230 | mutex_unlock(&indio_dev->mlock); | |
231 | ||
232 | return 0; | |
233 | } | |
69f0793e | 234 | EXPORT_SYMBOL(iio_device_set_clock); |
bc2b7dab GB |
235 | |
236 | /** | |
237 | * iio_get_time_ns() - utility function to get a time stamp for events etc | |
238 | * @indio_dev: device | |
239 | */ | |
240 | s64 iio_get_time_ns(const struct iio_dev *indio_dev) | |
241 | { | |
45e7f5d2 | 242 | struct timespec64 tp; |
bc2b7dab GB |
243 | |
244 | switch (iio_device_get_clock(indio_dev)) { | |
245 | case CLOCK_REALTIME: | |
45e7f5d2 | 246 | return ktime_get_real_ns(); |
bc2b7dab | 247 | case CLOCK_MONOTONIC: |
45e7f5d2 | 248 | return ktime_get_ns(); |
bc2b7dab | 249 | case CLOCK_MONOTONIC_RAW: |
45e7f5d2 | 250 | return ktime_get_raw_ns(); |
bc2b7dab | 251 | case CLOCK_REALTIME_COARSE: |
45e7f5d2 | 252 | return ktime_to_ns(ktime_get_coarse_real()); |
bc2b7dab | 253 | case CLOCK_MONOTONIC_COARSE: |
45e7f5d2 AB |
254 | ktime_get_coarse_ts64(&tp); |
255 | return timespec64_to_ns(&tp); | |
bc2b7dab | 256 | case CLOCK_BOOTTIME: |
9285ec4c | 257 | return ktime_get_boottime_ns(); |
bc2b7dab | 258 | case CLOCK_TAI: |
9285ec4c | 259 | return ktime_get_clocktai_ns(); |
bc2b7dab GB |
260 | default: |
261 | BUG(); | |
262 | } | |
bc2b7dab GB |
263 | } |
264 | EXPORT_SYMBOL(iio_get_time_ns); | |
265 | ||
266 | /** | |
267 | * iio_get_time_res() - utility function to get time stamp clock resolution in | |
268 | * nano seconds. | |
269 | * @indio_dev: device | |
270 | */ | |
271 | unsigned int iio_get_time_res(const struct iio_dev *indio_dev) | |
272 | { | |
273 | switch (iio_device_get_clock(indio_dev)) { | |
274 | case CLOCK_REALTIME: | |
275 | case CLOCK_MONOTONIC: | |
276 | case CLOCK_MONOTONIC_RAW: | |
277 | case CLOCK_BOOTTIME: | |
278 | case CLOCK_TAI: | |
279 | return hrtimer_resolution; | |
280 | case CLOCK_REALTIME_COARSE: | |
281 | case CLOCK_MONOTONIC_COARSE: | |
282 | return LOW_RES_NSEC; | |
283 | default: | |
284 | BUG(); | |
285 | } | |
286 | } | |
287 | EXPORT_SYMBOL(iio_get_time_res); | |
288 | ||
847ec80b JC |
289 | static int __init iio_init(void) |
290 | { | |
291 | int ret; | |
292 | ||
5aaaeba8 JC |
293 | /* Register sysfs bus */ |
294 | ret = bus_register(&iio_bus_type); | |
847ec80b | 295 | if (ret < 0) { |
3176dd5d | 296 | pr_err("could not register bus type\n"); |
847ec80b JC |
297 | goto error_nothing; |
298 | } | |
299 | ||
9aa1a167 JC |
300 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
301 | if (ret < 0) { | |
3176dd5d | 302 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 303 | goto error_unregister_bus_type; |
9aa1a167 | 304 | } |
847ec80b | 305 | |
e553f182 MH |
306 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
307 | ||
847ec80b JC |
308 | return 0; |
309 | ||
5aaaeba8 JC |
310 | error_unregister_bus_type: |
311 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
312 | error_nothing: |
313 | return ret; | |
314 | } | |
315 | ||
316 | static void __exit iio_exit(void) | |
317 | { | |
9aa1a167 JC |
318 | if (iio_devt) |
319 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 320 | bus_unregister(&iio_bus_type); |
e553f182 MH |
321 | debugfs_remove(iio_debugfs_dentry); |
322 | } | |
323 | ||
324 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
325 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
326 | size_t count, loff_t *ppos) | |
327 | { | |
328 | struct iio_dev *indio_dev = file->private_data; | |
96fb1b67 | 329 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
e553f182 | 330 | unsigned val = 0; |
e553f182 MH |
331 | int ret; |
332 | ||
2ddc982a AT |
333 | if (*ppos > 0) |
334 | return simple_read_from_buffer(userbuf, count, ppos, | |
96fb1b67 AA |
335 | iio_dev_opaque->read_buf, |
336 | iio_dev_opaque->read_buf_len); | |
2ddc982a | 337 | |
e553f182 | 338 | ret = indio_dev->info->debugfs_reg_access(indio_dev, |
96fb1b67 | 339 | iio_dev_opaque->cached_reg_addr, |
e553f182 | 340 | 0, &val); |
3d62c78a | 341 | if (ret) { |
e553f182 | 342 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); |
3d62c78a MF |
343 | return ret; |
344 | } | |
e553f182 | 345 | |
96fb1b67 AA |
346 | iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf, |
347 | sizeof(iio_dev_opaque->read_buf), | |
348 | "0x%X\n", val); | |
e553f182 | 349 | |
2ddc982a | 350 | return simple_read_from_buffer(userbuf, count, ppos, |
96fb1b67 AA |
351 | iio_dev_opaque->read_buf, |
352 | iio_dev_opaque->read_buf_len); | |
e553f182 MH |
353 | } |
354 | ||
355 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
356 | const char __user *userbuf, size_t count, loff_t *ppos) | |
357 | { | |
358 | struct iio_dev *indio_dev = file->private_data; | |
96fb1b67 | 359 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
e553f182 MH |
360 | unsigned reg, val; |
361 | char buf[80]; | |
362 | int ret; | |
363 | ||
364 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
365 | if (copy_from_user(buf, userbuf, count)) | |
366 | return -EFAULT; | |
367 | ||
368 | buf[count] = 0; | |
369 | ||
370 | ret = sscanf(buf, "%i %i", ®, &val); | |
371 | ||
372 | switch (ret) { | |
373 | case 1: | |
96fb1b67 | 374 | iio_dev_opaque->cached_reg_addr = reg; |
e553f182 MH |
375 | break; |
376 | case 2: | |
96fb1b67 | 377 | iio_dev_opaque->cached_reg_addr = reg; |
e553f182 MH |
378 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, |
379 | val, NULL); | |
380 | if (ret) { | |
381 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
382 | __func__); | |
383 | return ret; | |
384 | } | |
385 | break; | |
386 | default: | |
387 | return -EINVAL; | |
388 | } | |
389 | ||
390 | return count; | |
391 | } | |
392 | ||
393 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 394 | .open = simple_open, |
e553f182 MH |
395 | .read = iio_debugfs_read_reg, |
396 | .write = iio_debugfs_write_reg, | |
397 | }; | |
398 | ||
399 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
400 | { | |
96fb1b67 AA |
401 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
402 | debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry); | |
847ec80b JC |
403 | } |
404 | ||
8915aaca | 405 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
e553f182 | 406 | { |
96fb1b67 AA |
407 | struct iio_dev_opaque *iio_dev_opaque; |
408 | ||
e553f182 | 409 | if (indio_dev->info->debugfs_reg_access == NULL) |
8915aaca | 410 | return; |
e553f182 | 411 | |
abd5a2fb | 412 | if (!iio_debugfs_dentry) |
8915aaca | 413 | return; |
e553f182 | 414 | |
96fb1b67 AA |
415 | iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
416 | ||
417 | iio_dev_opaque->debugfs_dentry = | |
e553f182 MH |
418 | debugfs_create_dir(dev_name(&indio_dev->dev), |
419 | iio_debugfs_dentry); | |
e553f182 | 420 | |
8915aaca | 421 | debugfs_create_file("direct_reg_access", 0644, |
96fb1b67 | 422 | iio_dev_opaque->debugfs_dentry, indio_dev, |
8915aaca | 423 | &iio_debugfs_reg_fops); |
e553f182 MH |
424 | } |
425 | #else | |
8915aaca | 426 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
e553f182 | 427 | { |
e553f182 MH |
428 | } |
429 | ||
430 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
431 | { | |
432 | } | |
433 | #endif /* CONFIG_DEBUG_FS */ | |
434 | ||
4fee7e16 LPC |
435 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
436 | struct device_attribute *attr, | |
437 | char *buf) | |
438 | { | |
e53f5ac5 | 439 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
440 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
441 | const struct iio_chan_spec_ext_info *ext_info; | |
442 | ||
443 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
444 | ||
fc6d1139 | 445 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
446 | } |
447 | ||
448 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
449 | struct device_attribute *attr, | |
450 | const char *buf, | |
451 | size_t len) | |
452 | { | |
e53f5ac5 | 453 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
454 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
455 | const struct iio_chan_spec_ext_info *ext_info; | |
456 | ||
457 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
458 | ||
fc6d1139 MH |
459 | return ext_info->write(indio_dev, ext_info->private, |
460 | this_attr->c, buf, len); | |
4fee7e16 LPC |
461 | } |
462 | ||
5212cc8a LPC |
463 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
464 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
465 | { | |
466 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
467 | unsigned int i; | |
468 | size_t len = 0; | |
469 | ||
470 | if (!e->num_items) | |
471 | return 0; | |
472 | ||
473 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 474 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
475 | |
476 | /* replace last space with a newline */ | |
477 | buf[len - 1] = '\n'; | |
478 | ||
479 | return len; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
482 | ||
483 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
484 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
485 | { | |
486 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
487 | int i; | |
488 | ||
489 | if (!e->get) | |
490 | return -EINVAL; | |
491 | ||
492 | i = e->get(indio_dev, chan); | |
493 | if (i < 0) | |
494 | return i; | |
495 | else if (i >= e->num_items) | |
496 | return -EINVAL; | |
497 | ||
598db581 | 498 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
499 | } |
500 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
501 | ||
502 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
503 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
504 | size_t len) | |
505 | { | |
506 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
5212cc8a LPC |
507 | int ret; |
508 | ||
509 | if (!e->set) | |
510 | return -EINVAL; | |
511 | ||
02e9a0ff AS |
512 | ret = __sysfs_match_string(e->items, e->num_items, buf); |
513 | if (ret < 0) | |
514 | return ret; | |
5212cc8a | 515 | |
02e9a0ff | 516 | ret = e->set(indio_dev, chan, ret); |
5212cc8a LPC |
517 | return ret ? ret : len; |
518 | } | |
519 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
520 | ||
dfc57732 GB |
521 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
522 | .rotation = { | |
523 | "1", "0", "0", | |
524 | "0", "1", "0", | |
525 | "0", "0", "1" | |
526 | } | |
527 | }; | |
528 | ||
529 | static int iio_setup_mount_idmatrix(const struct device *dev, | |
530 | struct iio_mount_matrix *matrix) | |
531 | { | |
532 | *matrix = iio_mount_idmatrix; | |
533 | dev_info(dev, "mounting matrix not found: using identity...\n"); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, | |
538 | const struct iio_chan_spec *chan, char *buf) | |
539 | { | |
540 | const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) | |
541 | priv)(indio_dev, chan); | |
542 | ||
543 | if (IS_ERR(mtx)) | |
544 | return PTR_ERR(mtx); | |
545 | ||
546 | if (!mtx) | |
547 | mtx = &iio_mount_idmatrix; | |
548 | ||
549 | return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", | |
550 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], | |
551 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], | |
552 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); | |
555 | ||
556 | /** | |
fb158971 AS |
557 | * iio_read_mount_matrix() - retrieve iio device mounting matrix from |
558 | * device "mount-matrix" property | |
dfc57732 GB |
559 | * @dev: device the mounting matrix property is assigned to |
560 | * @propname: device specific mounting matrix property name | |
561 | * @matrix: where to store retrieved matrix | |
562 | * | |
563 | * If device is assigned no mounting matrix property, a default 3x3 identity | |
564 | * matrix will be filled in. | |
565 | * | |
566 | * Return: 0 if success, or a negative error code on failure. | |
567 | */ | |
fb158971 AS |
568 | int iio_read_mount_matrix(struct device *dev, const char *propname, |
569 | struct iio_mount_matrix *matrix) | |
dfc57732 | 570 | { |
fb158971 AS |
571 | size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation); |
572 | int err; | |
dfc57732 | 573 | |
fb158971 AS |
574 | err = device_property_read_string_array(dev, propname, |
575 | matrix->rotation, len); | |
576 | if (err == len) | |
577 | return 0; | |
dfc57732 | 578 | |
fb158971 AS |
579 | if (err >= 0) |
580 | /* Invalid number of matrix entries. */ | |
581 | return -EINVAL; | |
dfc57732 | 582 | |
fb158971 AS |
583 | if (err != -EINVAL) |
584 | /* Invalid matrix declaration format. */ | |
585 | return err; | |
dfc57732 GB |
586 | |
587 | /* Matrix was not declared at all: fallback to identity. */ | |
588 | return iio_setup_mount_idmatrix(dev, matrix); | |
589 | } | |
fb158971 | 590 | EXPORT_SYMBOL(iio_read_mount_matrix); |
dfc57732 | 591 | |
51239600 JC |
592 | static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, |
593 | int size, const int *vals) | |
847ec80b | 594 | { |
7985e7c1 | 595 | unsigned long long tmp; |
51239600 | 596 | int tmp0, tmp1; |
67eedba3 | 597 | bool scale_db = false; |
1d892719 | 598 | |
3661f3f5 | 599 | switch (type) { |
67eedba3 | 600 | case IIO_VAL_INT: |
35a4eeb0 | 601 | return scnprintf(buf, len, "%d", vals[0]); |
67eedba3 MH |
602 | case IIO_VAL_INT_PLUS_MICRO_DB: |
603 | scale_db = true; | |
df561f66 | 604 | fallthrough; |
67eedba3 | 605 | case IIO_VAL_INT_PLUS_MICRO: |
9fbfb4b3 | 606 | if (vals[1] < 0) |
35a4eeb0 | 607 | return scnprintf(buf, len, "-%d.%06u%s", abs(vals[0]), |
51239600 | 608 | -vals[1], scale_db ? " dB" : ""); |
1d892719 | 609 | else |
35a4eeb0 | 610 | return scnprintf(buf, len, "%d.%06u%s", vals[0], vals[1], |
51239600 | 611 | scale_db ? " dB" : ""); |
67eedba3 | 612 | case IIO_VAL_INT_PLUS_NANO: |
9fbfb4b3 | 613 | if (vals[1] < 0) |
35a4eeb0 | 614 | return scnprintf(buf, len, "-%d.%09u", abs(vals[0]), |
51239600 | 615 | -vals[1]); |
71646e2c | 616 | else |
35a4eeb0 | 617 | return scnprintf(buf, len, "%d.%09u", vals[0], vals[1]); |
7985e7c1 | 618 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 | 619 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
51239600 JC |
620 | tmp1 = vals[1]; |
621 | tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1); | |
35a4eeb0 | 622 | return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); |
103d9fb9 | 623 | case IIO_VAL_FRACTIONAL_LOG2: |
7fd6592d NS |
624 | tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]); |
625 | tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1); | |
35a4eeb0 | 626 | return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); |
9fbfb4b3 SP |
627 | case IIO_VAL_INT_MULTIPLE: |
628 | { | |
629 | int i; | |
51239600 | 630 | int l = 0; |
9fbfb4b3 | 631 | |
51239600 | 632 | for (i = 0; i < size; ++i) { |
35a4eeb0 | 633 | l += scnprintf(&buf[l], len - l, "%d ", vals[i]); |
51239600 JC |
634 | if (l >= len) |
635 | break; | |
636 | } | |
637 | return l; | |
9fbfb4b3 | 638 | } |
8cb34036 | 639 | case IIO_VAL_CHAR: |
35a4eeb0 | 640 | return scnprintf(buf, len, "%c", (char)vals[0]); |
67eedba3 | 641 | default: |
1d892719 | 642 | return 0; |
67eedba3 | 643 | } |
1d892719 | 644 | } |
51239600 JC |
645 | |
646 | /** | |
647 | * iio_format_value() - Formats a IIO value into its string representation | |
648 | * @buf: The buffer to which the formatted value gets written | |
649 | * which is assumed to be big enough (i.e. PAGE_SIZE). | |
c175cb7c | 650 | * @type: One of the IIO_VAL_* constants. This decides how the val |
51239600 JC |
651 | * and val2 parameters are formatted. |
652 | * @size: Number of IIO value entries contained in vals | |
653 | * @vals: Pointer to the values, exact meaning depends on the | |
654 | * type parameter. | |
655 | * | |
656 | * Return: 0 by default, a negative number on failure or the | |
657 | * total number of characters written for a type that belongs | |
c175cb7c | 658 | * to the IIO_VAL_* constant. |
51239600 JC |
659 | */ |
660 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) | |
661 | { | |
662 | ssize_t len; | |
663 | ||
664 | len = __iio_format_value(buf, PAGE_SIZE, type, size, vals); | |
665 | if (len >= PAGE_SIZE - 1) | |
666 | return -EFBIG; | |
667 | ||
668 | return len + sprintf(buf + len, "\n"); | |
669 | } | |
7d2c2aca | 670 | EXPORT_SYMBOL_GPL(iio_format_value); |
1d892719 | 671 | |
3661f3f5 LPC |
672 | static ssize_t iio_read_channel_info(struct device *dev, |
673 | struct device_attribute *attr, | |
674 | char *buf) | |
675 | { | |
676 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
677 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
678 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
679 | int ret; | |
680 | int val_len = 2; | |
681 | ||
682 | if (indio_dev->info->read_raw_multi) | |
683 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
684 | INDIO_MAX_RAW_ELEMENTS, | |
685 | vals, &val_len, | |
686 | this_attr->address); | |
687 | else | |
688 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
689 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
690 | |
691 | if (ret < 0) | |
692 | return ret; | |
693 | ||
9fbfb4b3 | 694 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
695 | } |
696 | ||
51239600 JC |
697 | static ssize_t iio_format_avail_list(char *buf, const int *vals, |
698 | int type, int length) | |
699 | { | |
700 | int i; | |
701 | ssize_t len = 0; | |
702 | ||
703 | switch (type) { | |
704 | case IIO_VAL_INT: | |
705 | for (i = 0; i < length; i++) { | |
706 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
707 | type, 1, &vals[i]); | |
708 | if (len >= PAGE_SIZE) | |
709 | return -EFBIG; | |
710 | if (i < length - 1) | |
35a4eeb0 | 711 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
712 | " "); |
713 | else | |
35a4eeb0 | 714 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
715 | "\n"); |
716 | if (len >= PAGE_SIZE) | |
717 | return -EFBIG; | |
718 | } | |
719 | break; | |
720 | default: | |
721 | for (i = 0; i < length / 2; i++) { | |
722 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
723 | type, 2, &vals[i * 2]); | |
724 | if (len >= PAGE_SIZE) | |
725 | return -EFBIG; | |
726 | if (i < length / 2 - 1) | |
35a4eeb0 | 727 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
728 | " "); |
729 | else | |
35a4eeb0 | 730 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
731 | "\n"); |
732 | if (len >= PAGE_SIZE) | |
733 | return -EFBIG; | |
734 | } | |
735 | } | |
736 | ||
737 | return len; | |
738 | } | |
739 | ||
740 | static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) | |
741 | { | |
742 | int i; | |
743 | ssize_t len; | |
744 | ||
745 | len = snprintf(buf, PAGE_SIZE, "["); | |
746 | switch (type) { | |
747 | case IIO_VAL_INT: | |
748 | for (i = 0; i < 3; i++) { | |
749 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
750 | type, 1, &vals[i]); | |
751 | if (len >= PAGE_SIZE) | |
752 | return -EFBIG; | |
753 | if (i < 2) | |
35a4eeb0 | 754 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
755 | " "); |
756 | else | |
35a4eeb0 | 757 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
758 | "]\n"); |
759 | if (len >= PAGE_SIZE) | |
760 | return -EFBIG; | |
761 | } | |
762 | break; | |
763 | default: | |
764 | for (i = 0; i < 3; i++) { | |
765 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
766 | type, 2, &vals[i * 2]); | |
767 | if (len >= PAGE_SIZE) | |
768 | return -EFBIG; | |
769 | if (i < 2) | |
35a4eeb0 | 770 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
771 | " "); |
772 | else | |
35a4eeb0 | 773 | len += scnprintf(buf + len, PAGE_SIZE - len, |
51239600 JC |
774 | "]\n"); |
775 | if (len >= PAGE_SIZE) | |
776 | return -EFBIG; | |
777 | } | |
778 | } | |
779 | ||
780 | return len; | |
781 | } | |
782 | ||
783 | static ssize_t iio_read_channel_info_avail(struct device *dev, | |
784 | struct device_attribute *attr, | |
785 | char *buf) | |
786 | { | |
787 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
788 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
789 | const int *vals; | |
790 | int ret; | |
791 | int length; | |
792 | int type; | |
793 | ||
794 | ret = indio_dev->info->read_avail(indio_dev, this_attr->c, | |
795 | &vals, &type, &length, | |
796 | this_attr->address); | |
797 | ||
798 | if (ret < 0) | |
799 | return ret; | |
800 | switch (ret) { | |
801 | case IIO_AVAIL_LIST: | |
802 | return iio_format_avail_list(buf, vals, type, length); | |
803 | case IIO_AVAIL_RANGE: | |
804 | return iio_format_avail_range(buf, vals, type); | |
805 | default: | |
806 | return -EINVAL; | |
807 | } | |
808 | } | |
809 | ||
6807d721 | 810 | /** |
b8528224 | 811 | * __iio_str_to_fixpoint() - Parse a fixed-point number from a string |
6807d721 LPC |
812 | * @str: The string to parse |
813 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
814 | * @integer: The integer part of the number | |
815 | * @fract: The fractional part of the number | |
b8528224 | 816 | * @scale_db: True if this should parse as dB |
6807d721 LPC |
817 | * |
818 | * Returns 0 on success, or a negative error code if the string could not be | |
819 | * parsed. | |
820 | */ | |
b8528224 BB |
821 | static int __iio_str_to_fixpoint(const char *str, int fract_mult, |
822 | int *integer, int *fract, bool scale_db) | |
6807d721 LPC |
823 | { |
824 | int i = 0, f = 0; | |
825 | bool integer_part = true, negative = false; | |
826 | ||
f47dff32 SN |
827 | if (fract_mult == 0) { |
828 | *fract = 0; | |
829 | ||
830 | return kstrtoint(str, 0, integer); | |
831 | } | |
832 | ||
6807d721 LPC |
833 | if (str[0] == '-') { |
834 | negative = true; | |
835 | str++; | |
836 | } else if (str[0] == '+') { | |
837 | str++; | |
838 | } | |
839 | ||
840 | while (*str) { | |
841 | if ('0' <= *str && *str <= '9') { | |
842 | if (integer_part) { | |
843 | i = i * 10 + *str - '0'; | |
844 | } else { | |
845 | f += fract_mult * (*str - '0'); | |
846 | fract_mult /= 10; | |
847 | } | |
848 | } else if (*str == '\n') { | |
849 | if (*(str + 1) == '\0') | |
850 | break; | |
851 | else | |
852 | return -EINVAL; | |
b8528224 BB |
853 | } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) { |
854 | /* Ignore the dB suffix */ | |
855 | str += sizeof(" dB") - 1; | |
856 | continue; | |
857 | } else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) { | |
858 | /* Ignore the dB suffix */ | |
859 | str += sizeof("dB") - 1; | |
860 | continue; | |
6807d721 LPC |
861 | } else if (*str == '.' && integer_part) { |
862 | integer_part = false; | |
863 | } else { | |
864 | return -EINVAL; | |
865 | } | |
866 | str++; | |
867 | } | |
868 | ||
869 | if (negative) { | |
870 | if (i) | |
871 | i = -i; | |
872 | else | |
873 | f = -f; | |
874 | } | |
875 | ||
876 | *integer = i; | |
877 | *fract = f; | |
878 | ||
879 | return 0; | |
880 | } | |
b8528224 BB |
881 | |
882 | /** | |
883 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
884 | * @str: The string to parse | |
885 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
886 | * @integer: The integer part of the number | |
887 | * @fract: The fractional part of the number | |
888 | * | |
889 | * Returns 0 on success, or a negative error code if the string could not be | |
890 | * parsed. | |
891 | */ | |
892 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
893 | int *integer, int *fract) | |
894 | { | |
895 | return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false); | |
896 | } | |
6807d721 LPC |
897 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); |
898 | ||
1d892719 JC |
899 | static ssize_t iio_write_channel_info(struct device *dev, |
900 | struct device_attribute *attr, | |
901 | const char *buf, | |
902 | size_t len) | |
903 | { | |
e53f5ac5 | 904 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 905 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 | 906 | int ret, fract_mult = 100000; |
8cb34036 AM |
907 | int integer, fract = 0; |
908 | bool is_char = false; | |
b8528224 | 909 | bool scale_db = false; |
1d892719 JC |
910 | |
911 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 912 | if (!indio_dev->info->write_raw) |
1d892719 | 913 | return -EINVAL; |
5c04af04 MH |
914 | |
915 | if (indio_dev->info->write_raw_get_fmt) | |
916 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
917 | this_attr->c, this_attr->address)) { | |
f47dff32 SN |
918 | case IIO_VAL_INT: |
919 | fract_mult = 0; | |
920 | break; | |
b8528224 BB |
921 | case IIO_VAL_INT_PLUS_MICRO_DB: |
922 | scale_db = true; | |
df561f66 | 923 | fallthrough; |
5c04af04 MH |
924 | case IIO_VAL_INT_PLUS_MICRO: |
925 | fract_mult = 100000; | |
926 | break; | |
927 | case IIO_VAL_INT_PLUS_NANO: | |
928 | fract_mult = 100000000; | |
929 | break; | |
8cb34036 AM |
930 | case IIO_VAL_CHAR: |
931 | is_char = true; | |
932 | break; | |
5c04af04 MH |
933 | default: |
934 | return -EINVAL; | |
935 | } | |
936 | ||
8cb34036 AM |
937 | if (is_char) { |
938 | char ch; | |
939 | ||
940 | if (sscanf(buf, "%c", &ch) != 1) | |
941 | return -EINVAL; | |
942 | integer = ch; | |
943 | } else { | |
5403f280 MC |
944 | ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract, |
945 | scale_db); | |
8cb34036 AM |
946 | if (ret) |
947 | return ret; | |
948 | } | |
1d892719 | 949 | |
6fe8135f | 950 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 951 | integer, fract, this_attr->address); |
1d892719 JC |
952 | if (ret) |
953 | return ret; | |
954 | ||
955 | return len; | |
956 | } | |
957 | ||
df9c1c42 | 958 | static |
1d892719 JC |
959 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
960 | const char *postfix, | |
961 | struct iio_chan_spec const *chan, | |
962 | ssize_t (*readfunc)(struct device *dev, | |
963 | struct device_attribute *attr, | |
964 | char *buf), | |
965 | ssize_t (*writefunc)(struct device *dev, | |
966 | struct device_attribute *attr, | |
967 | const char *buf, | |
968 | size_t len), | |
3704432f | 969 | enum iio_shared_by shared_by) |
1d892719 | 970 | { |
3704432f | 971 | int ret = 0; |
7bbcf7e1 | 972 | char *name = NULL; |
3704432f | 973 | char *full_postfix; |
1d892719 | 974 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 975 | |
ade7ef7b | 976 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 977 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
978 | if (chan->extend_name) |
979 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
980 | iio_modifier_names[chan | |
981 | ->channel2], | |
982 | chan->extend_name, | |
983 | postfix); | |
984 | else | |
985 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
986 | iio_modifier_names[chan | |
987 | ->channel2], | |
988 | postfix); | |
989 | } else { | |
77bfa8ba | 990 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
991 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
992 | else | |
993 | full_postfix = kasprintf(GFP_KERNEL, | |
994 | "%s_%s", | |
995 | chan->extend_name, | |
996 | postfix); | |
997 | } | |
3704432f JC |
998 | if (full_postfix == NULL) |
999 | return -ENOMEM; | |
1d892719 | 1000 | |
4abf6f8b | 1001 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 1002 | switch (shared_by) { |
c006ec83 | 1003 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 1004 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
1005 | break; |
1006 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 1007 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
1008 | iio_direction[chan->output], |
1009 | full_postfix); | |
1010 | break; | |
3704432f | 1011 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 1012 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
1013 | iio_direction[chan->output], |
1014 | iio_chan_type_name_spec[chan->type], | |
1015 | iio_chan_type_name_spec[chan->type], | |
1016 | full_postfix); | |
3704432f JC |
1017 | break; |
1018 | case IIO_SEPARATE: | |
1019 | if (!chan->indexed) { | |
231bfe53 | 1020 | WARN(1, "Differential channels must be indexed\n"); |
3704432f JC |
1021 | ret = -EINVAL; |
1022 | goto error_free_full_postfix; | |
1023 | } | |
7bbcf7e1 | 1024 | name = kasprintf(GFP_KERNEL, |
3704432f | 1025 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
1026 | iio_direction[chan->output], |
1027 | iio_chan_type_name_spec[chan->type], | |
1028 | chan->channel, | |
1029 | iio_chan_type_name_spec[chan->type], | |
1030 | chan->channel2, | |
1031 | full_postfix); | |
3704432f | 1032 | break; |
ade7ef7b JC |
1033 | } |
1034 | } else { /* Single ended */ | |
3704432f | 1035 | switch (shared_by) { |
c006ec83 | 1036 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 1037 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
1038 | break; |
1039 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 1040 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
1041 | iio_direction[chan->output], |
1042 | full_postfix); | |
1043 | break; | |
3704432f | 1044 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 1045 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
1046 | iio_direction[chan->output], |
1047 | iio_chan_type_name_spec[chan->type], | |
1048 | full_postfix); | |
3704432f JC |
1049 | break; |
1050 | ||
1051 | case IIO_SEPARATE: | |
1052 | if (chan->indexed) | |
7bbcf7e1 | 1053 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
1054 | iio_direction[chan->output], |
1055 | iio_chan_type_name_spec[chan->type], | |
1056 | chan->channel, | |
1057 | full_postfix); | |
1058 | else | |
7bbcf7e1 | 1059 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
1060 | iio_direction[chan->output], |
1061 | iio_chan_type_name_spec[chan->type], | |
1062 | full_postfix); | |
1063 | break; | |
1064 | } | |
ade7ef7b | 1065 | } |
7bbcf7e1 | 1066 | if (name == NULL) { |
1d892719 JC |
1067 | ret = -ENOMEM; |
1068 | goto error_free_full_postfix; | |
1069 | } | |
7bbcf7e1 | 1070 | dev_attr->attr.name = name; |
1d892719 JC |
1071 | |
1072 | if (readfunc) { | |
1073 | dev_attr->attr.mode |= S_IRUGO; | |
1074 | dev_attr->show = readfunc; | |
1075 | } | |
1076 | ||
1077 | if (writefunc) { | |
1078 | dev_attr->attr.mode |= S_IWUSR; | |
1079 | dev_attr->store = writefunc; | |
1080 | } | |
7bbcf7e1 | 1081 | |
1d892719 JC |
1082 | error_free_full_postfix: |
1083 | kfree(full_postfix); | |
3704432f | 1084 | |
1d892719 JC |
1085 | return ret; |
1086 | } | |
1087 | ||
df9c1c42 | 1088 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
1089 | { |
1090 | kfree(dev_attr->attr.name); | |
1091 | } | |
1092 | ||
1093 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
1094 | struct iio_chan_spec const *chan, |
1095 | ssize_t (*readfunc)(struct device *dev, | |
1096 | struct device_attribute *attr, | |
1097 | char *buf), | |
1098 | ssize_t (*writefunc)(struct device *dev, | |
1099 | struct device_attribute *attr, | |
1100 | const char *buf, | |
1101 | size_t len), | |
e614a54b | 1102 | u64 mask, |
3704432f | 1103 | enum iio_shared_by shared_by, |
1d892719 JC |
1104 | struct device *dev, |
1105 | struct list_head *attr_list) | |
1106 | { | |
1107 | int ret; | |
1108 | struct iio_dev_attr *iio_attr, *t; | |
1109 | ||
670c1103 | 1110 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
1111 | if (iio_attr == NULL) |
1112 | return -ENOMEM; | |
1d892719 JC |
1113 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
1114 | postfix, chan, | |
3704432f | 1115 | readfunc, writefunc, shared_by); |
1d892719 JC |
1116 | if (ret) |
1117 | goto error_iio_dev_attr_free; | |
1118 | iio_attr->c = chan; | |
1119 | iio_attr->address = mask; | |
1120 | list_for_each_entry(t, attr_list, l) | |
1121 | if (strcmp(t->dev_attr.attr.name, | |
1122 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 1123 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
1124 | dev_err(dev, "tried to double register : %s\n", |
1125 | t->dev_attr.attr.name); | |
1126 | ret = -EBUSY; | |
1127 | goto error_device_attr_deinit; | |
1128 | } | |
1d892719 JC |
1129 | list_add(&iio_attr->l, attr_list); |
1130 | ||
1131 | return 0; | |
1132 | ||
1133 | error_device_attr_deinit: | |
1134 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
1135 | error_iio_dev_attr_free: | |
1136 | kfree(iio_attr); | |
1d892719 JC |
1137 | return ret; |
1138 | } | |
1139 | ||
3704432f JC |
1140 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
1141 | struct iio_chan_spec const *chan, | |
1142 | enum iio_shared_by shared_by, | |
1143 | const long *infomask) | |
1d892719 | 1144 | { |
207c2d27 | 1145 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
3704432f | 1146 | int i, ret, attrcount = 0; |
1d892719 | 1147 | |
1016d567 | 1148 | for_each_set_bit(i, infomask, sizeof(*infomask)*8) { |
ef4b4856 JC |
1149 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1150 | return -EINVAL; | |
8655cc49 JC |
1151 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
1152 | chan, | |
1153 | &iio_read_channel_info, | |
1154 | &iio_write_channel_info, | |
1155 | i, | |
3704432f | 1156 | shared_by, |
8655cc49 | 1157 | &indio_dev->dev, |
207c2d27 | 1158 | &iio_dev_opaque->channel_attr_list); |
3704432f | 1159 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 1160 | continue; |
3704432f JC |
1161 | else if (ret < 0) |
1162 | return ret; | |
8655cc49 JC |
1163 | attrcount++; |
1164 | } | |
5f420b42 | 1165 | |
3704432f JC |
1166 | return attrcount; |
1167 | } | |
1168 | ||
51239600 JC |
1169 | static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev, |
1170 | struct iio_chan_spec const *chan, | |
1171 | enum iio_shared_by shared_by, | |
1172 | const long *infomask) | |
1173 | { | |
207c2d27 | 1174 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
51239600 JC |
1175 | int i, ret, attrcount = 0; |
1176 | char *avail_postfix; | |
1177 | ||
1016d567 | 1178 | for_each_set_bit(i, infomask, sizeof(*infomask) * 8) { |
936d3e53 YX |
1179 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1180 | return -EINVAL; | |
51239600 JC |
1181 | avail_postfix = kasprintf(GFP_KERNEL, |
1182 | "%s_available", | |
1183 | iio_chan_info_postfix[i]); | |
1184 | if (!avail_postfix) | |
1185 | return -ENOMEM; | |
1186 | ||
1187 | ret = __iio_add_chan_devattr(avail_postfix, | |
1188 | chan, | |
1189 | &iio_read_channel_info_avail, | |
1190 | NULL, | |
1191 | i, | |
1192 | shared_by, | |
1193 | &indio_dev->dev, | |
207c2d27 | 1194 | &iio_dev_opaque->channel_attr_list); |
51239600 JC |
1195 | kfree(avail_postfix); |
1196 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) | |
1197 | continue; | |
1198 | else if (ret < 0) | |
1199 | return ret; | |
1200 | attrcount++; | |
1201 | } | |
1202 | ||
1203 | return attrcount; | |
1204 | } | |
1205 | ||
3704432f JC |
1206 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1207 | struct iio_chan_spec const *chan) | |
1208 | { | |
207c2d27 | 1209 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
3704432f JC |
1210 | int ret, attrcount = 0; |
1211 | const struct iio_chan_spec_ext_info *ext_info; | |
1212 | ||
1213 | if (chan->channel < 0) | |
1214 | return 0; | |
1215 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
1216 | IIO_SEPARATE, | |
1217 | &chan->info_mask_separate); | |
1218 | if (ret < 0) | |
1219 | return ret; | |
1220 | attrcount += ret; | |
1221 | ||
51239600 JC |
1222 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1223 | IIO_SEPARATE, | |
1224 | &chan-> | |
1225 | info_mask_separate_available); | |
1226 | if (ret < 0) | |
1227 | return ret; | |
1228 | attrcount += ret; | |
1229 | ||
3704432f JC |
1230 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1231 | IIO_SHARED_BY_TYPE, | |
1232 | &chan->info_mask_shared_by_type); | |
1233 | if (ret < 0) | |
1234 | return ret; | |
1235 | attrcount += ret; | |
1236 | ||
51239600 JC |
1237 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1238 | IIO_SHARED_BY_TYPE, | |
1239 | &chan-> | |
1240 | info_mask_shared_by_type_available); | |
1241 | if (ret < 0) | |
1242 | return ret; | |
1243 | attrcount += ret; | |
1244 | ||
c006ec83 JC |
1245 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1246 | IIO_SHARED_BY_DIR, | |
1247 | &chan->info_mask_shared_by_dir); | |
1248 | if (ret < 0) | |
1249 | return ret; | |
1250 | attrcount += ret; | |
1251 | ||
51239600 JC |
1252 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1253 | IIO_SHARED_BY_DIR, | |
1254 | &chan->info_mask_shared_by_dir_available); | |
1255 | if (ret < 0) | |
1256 | return ret; | |
1257 | attrcount += ret; | |
1258 | ||
c006ec83 JC |
1259 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1260 | IIO_SHARED_BY_ALL, | |
1261 | &chan->info_mask_shared_by_all); | |
1262 | if (ret < 0) | |
1263 | return ret; | |
1264 | attrcount += ret; | |
1265 | ||
51239600 JC |
1266 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1267 | IIO_SHARED_BY_ALL, | |
1268 | &chan->info_mask_shared_by_all_available); | |
1269 | if (ret < 0) | |
1270 | return ret; | |
1271 | attrcount += ret; | |
1272 | ||
5f420b42 LPC |
1273 | if (chan->ext_info) { |
1274 | unsigned int i = 0; | |
1275 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
1276 | ret = __iio_add_chan_devattr(ext_info->name, | |
1277 | chan, | |
1278 | ext_info->read ? | |
1279 | &iio_read_channel_ext_info : NULL, | |
1280 | ext_info->write ? | |
1281 | &iio_write_channel_ext_info : NULL, | |
1282 | i, | |
1283 | ext_info->shared, | |
1284 | &indio_dev->dev, | |
207c2d27 | 1285 | &iio_dev_opaque->channel_attr_list); |
5f420b42 LPC |
1286 | i++; |
1287 | if (ret == -EBUSY && ext_info->shared) | |
1288 | continue; | |
1289 | ||
1290 | if (ret) | |
3704432f | 1291 | return ret; |
5f420b42 LPC |
1292 | |
1293 | attrcount++; | |
1294 | } | |
1295 | } | |
1296 | ||
3704432f | 1297 | return attrcount; |
1d892719 JC |
1298 | } |
1299 | ||
84088ebd LPC |
1300 | /** |
1301 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
1302 | * @attr_list: List of IIO device attributes | |
1303 | * | |
1304 | * This function frees the memory allocated for each of the IIO device | |
c1b03ab5 | 1305 | * attributes in the list. |
84088ebd LPC |
1306 | */ |
1307 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 1308 | { |
84088ebd LPC |
1309 | struct iio_dev_attr *p, *n; |
1310 | ||
1311 | list_for_each_entry_safe(p, n, attr_list, l) { | |
1312 | kfree(p->dev_attr.attr.name); | |
c1b03ab5 | 1313 | list_del(&p->l); |
84088ebd LPC |
1314 | kfree(p); |
1315 | } | |
1d892719 JC |
1316 | } |
1317 | ||
1b732888 JC |
1318 | static ssize_t iio_show_dev_name(struct device *dev, |
1319 | struct device_attribute *attr, | |
1320 | char *buf) | |
1321 | { | |
e53f5ac5 | 1322 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 1323 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
1324 | } |
1325 | ||
1326 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
1327 | ||
2c3d0c9f PR |
1328 | static ssize_t iio_show_dev_label(struct device *dev, |
1329 | struct device_attribute *attr, | |
1330 | char *buf) | |
1331 | { | |
1332 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
1333 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label); | |
1334 | } | |
1335 | ||
1336 | static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL); | |
1337 | ||
bc2b7dab GB |
1338 | static ssize_t iio_show_timestamp_clock(struct device *dev, |
1339 | struct device_attribute *attr, | |
1340 | char *buf) | |
1341 | { | |
1342 | const struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
1343 | const clockid_t clk = iio_device_get_clock(indio_dev); | |
1344 | const char *name; | |
1345 | ssize_t sz; | |
1346 | ||
1347 | switch (clk) { | |
1348 | case CLOCK_REALTIME: | |
1349 | name = "realtime\n"; | |
1350 | sz = sizeof("realtime\n"); | |
1351 | break; | |
1352 | case CLOCK_MONOTONIC: | |
1353 | name = "monotonic\n"; | |
1354 | sz = sizeof("monotonic\n"); | |
1355 | break; | |
1356 | case CLOCK_MONOTONIC_RAW: | |
1357 | name = "monotonic_raw\n"; | |
1358 | sz = sizeof("monotonic_raw\n"); | |
1359 | break; | |
1360 | case CLOCK_REALTIME_COARSE: | |
1361 | name = "realtime_coarse\n"; | |
1362 | sz = sizeof("realtime_coarse\n"); | |
1363 | break; | |
1364 | case CLOCK_MONOTONIC_COARSE: | |
1365 | name = "monotonic_coarse\n"; | |
1366 | sz = sizeof("monotonic_coarse\n"); | |
1367 | break; | |
1368 | case CLOCK_BOOTTIME: | |
1369 | name = "boottime\n"; | |
1370 | sz = sizeof("boottime\n"); | |
1371 | break; | |
1372 | case CLOCK_TAI: | |
1373 | name = "tai\n"; | |
1374 | sz = sizeof("tai\n"); | |
1375 | break; | |
1376 | default: | |
1377 | BUG(); | |
1378 | } | |
1379 | ||
1380 | memcpy(buf, name, sz); | |
1381 | return sz; | |
1382 | } | |
1383 | ||
1384 | static ssize_t iio_store_timestamp_clock(struct device *dev, | |
1385 | struct device_attribute *attr, | |
1386 | const char *buf, size_t len) | |
1387 | { | |
1388 | clockid_t clk; | |
1389 | int ret; | |
1390 | ||
1391 | if (sysfs_streq(buf, "realtime")) | |
1392 | clk = CLOCK_REALTIME; | |
1393 | else if (sysfs_streq(buf, "monotonic")) | |
1394 | clk = CLOCK_MONOTONIC; | |
1395 | else if (sysfs_streq(buf, "monotonic_raw")) | |
1396 | clk = CLOCK_MONOTONIC_RAW; | |
1397 | else if (sysfs_streq(buf, "realtime_coarse")) | |
1398 | clk = CLOCK_REALTIME_COARSE; | |
1399 | else if (sysfs_streq(buf, "monotonic_coarse")) | |
1400 | clk = CLOCK_MONOTONIC_COARSE; | |
1401 | else if (sysfs_streq(buf, "boottime")) | |
1402 | clk = CLOCK_BOOTTIME; | |
1403 | else if (sysfs_streq(buf, "tai")) | |
1404 | clk = CLOCK_TAI; | |
1405 | else | |
1406 | return -EINVAL; | |
1407 | ||
1408 | ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); | |
1409 | if (ret) | |
1410 | return ret; | |
1411 | ||
1412 | return len; | |
1413 | } | |
1414 | ||
1415 | static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, | |
1416 | iio_show_timestamp_clock, iio_store_timestamp_clock); | |
1417 | ||
f8c6f4e9 | 1418 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 1419 | { |
207c2d27 | 1420 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
26d25ae3 | 1421 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 1422 | struct iio_dev_attr *p; |
bc2b7dab | 1423 | struct attribute **attr, *clk = NULL; |
1d892719 | 1424 | |
26d25ae3 | 1425 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
1426 | if (indio_dev->info->attrs) { |
1427 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
1428 | while (*attr++ != NULL) |
1429 | attrcount_orig++; | |
847ec80b | 1430 | } |
26d25ae3 | 1431 | attrcount = attrcount_orig; |
1d892719 JC |
1432 | /* |
1433 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 1434 | * not need to be initialized if its name is NULL. |
1d892719 | 1435 | */ |
f8c6f4e9 JC |
1436 | if (indio_dev->channels) |
1437 | for (i = 0; i < indio_dev->num_channels; i++) { | |
bc2b7dab GB |
1438 | const struct iio_chan_spec *chan = |
1439 | &indio_dev->channels[i]; | |
1440 | ||
1441 | if (chan->type == IIO_TIMESTAMP) | |
1442 | clk = &dev_attr_current_timestamp_clock.attr; | |
1443 | ||
1444 | ret = iio_device_add_channel_sysfs(indio_dev, chan); | |
1d892719 JC |
1445 | if (ret < 0) |
1446 | goto error_clear_attrs; | |
26d25ae3 | 1447 | attrcount += ret; |
1d892719 | 1448 | } |
26d25ae3 | 1449 | |
fa83c3ba | 1450 | if (iio_dev_opaque->event_interface) |
bc2b7dab GB |
1451 | clk = &dev_attr_current_timestamp_clock.attr; |
1452 | ||
f8c6f4e9 | 1453 | if (indio_dev->name) |
26d25ae3 | 1454 | attrcount++; |
2c3d0c9f PR |
1455 | if (indio_dev->label) |
1456 | attrcount++; | |
bc2b7dab GB |
1457 | if (clk) |
1458 | attrcount++; | |
26d25ae3 | 1459 | |
207c2d27 AA |
1460 | iio_dev_opaque->chan_attr_group.attrs = |
1461 | kcalloc(attrcount + 1, | |
1462 | sizeof(iio_dev_opaque->chan_attr_group.attrs[0]), | |
1463 | GFP_KERNEL); | |
1464 | if (iio_dev_opaque->chan_attr_group.attrs == NULL) { | |
26d25ae3 JC |
1465 | ret = -ENOMEM; |
1466 | goto error_clear_attrs; | |
1b732888 | 1467 | } |
26d25ae3 | 1468 | /* Copy across original attributes */ |
f8c6f4e9 | 1469 | if (indio_dev->info->attrs) |
207c2d27 | 1470 | memcpy(iio_dev_opaque->chan_attr_group.attrs, |
f8c6f4e9 | 1471 | indio_dev->info->attrs->attrs, |
207c2d27 | 1472 | sizeof(iio_dev_opaque->chan_attr_group.attrs[0]) |
26d25ae3 JC |
1473 | *attrcount_orig); |
1474 | attrn = attrcount_orig; | |
1475 | /* Add all elements from the list. */ | |
207c2d27 AA |
1476 | list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l) |
1477 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
f8c6f4e9 | 1478 | if (indio_dev->name) |
207c2d27 | 1479 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; |
2c3d0c9f | 1480 | if (indio_dev->label) |
207c2d27 | 1481 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr; |
bc2b7dab | 1482 | if (clk) |
207c2d27 | 1483 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk; |
26d25ae3 | 1484 | |
f8c6f4e9 | 1485 | indio_dev->groups[indio_dev->groupcounter++] = |
207c2d27 | 1486 | &iio_dev_opaque->chan_attr_group; |
26d25ae3 | 1487 | |
1d892719 | 1488 | return 0; |
1b732888 | 1489 | |
1d892719 | 1490 | error_clear_attrs: |
207c2d27 | 1491 | iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list); |
1d892719 | 1492 | |
26d25ae3 | 1493 | return ret; |
847ec80b JC |
1494 | } |
1495 | ||
f8c6f4e9 | 1496 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 1497 | { |
207c2d27 | 1498 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1d892719 | 1499 | |
207c2d27 AA |
1500 | iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list); |
1501 | kfree(iio_dev_opaque->chan_attr_group.attrs); | |
1502 | iio_dev_opaque->chan_attr_group.attrs = NULL; | |
847ec80b JC |
1503 | } |
1504 | ||
847ec80b JC |
1505 | static void iio_dev_release(struct device *device) |
1506 | { | |
e53f5ac5 | 1507 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
6d4ebd56 AA |
1508 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1509 | ||
d89e119a | 1510 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
f8c6f4e9 JC |
1511 | iio_device_unregister_trigger_consumer(indio_dev); |
1512 | iio_device_unregister_eventset(indio_dev); | |
1513 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 1514 | |
9e69c935 LPC |
1515 | iio_buffer_put(indio_dev->buffer); |
1516 | ||
e407fd65 | 1517 | ida_simple_remove(&iio_ida, indio_dev->id); |
6d4ebd56 | 1518 | kfree(iio_dev_opaque); |
847ec80b JC |
1519 | } |
1520 | ||
17d82b47 | 1521 | struct device_type iio_device_type = { |
847ec80b JC |
1522 | .name = "iio_device", |
1523 | .release = iio_dev_release, | |
1524 | }; | |
1525 | ||
a7e57dce SK |
1526 | /** |
1527 | * iio_device_alloc() - allocate an iio_dev from a driver | |
c9561fd2 | 1528 | * @parent: Parent device. |
a7e57dce SK |
1529 | * @sizeof_priv: Space to allocate for private structure. |
1530 | **/ | |
78289b4a | 1531 | struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv) |
847ec80b | 1532 | { |
6d4ebd56 | 1533 | struct iio_dev_opaque *iio_dev_opaque; |
6f7c8ee5 JC |
1534 | struct iio_dev *dev; |
1535 | size_t alloc_size; | |
1536 | ||
6d4ebd56 | 1537 | alloc_size = sizeof(struct iio_dev_opaque); |
6f7c8ee5 JC |
1538 | if (sizeof_priv) { |
1539 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
1540 | alloc_size += sizeof_priv; | |
1541 | } | |
6f7c8ee5 | 1542 | |
6d4ebd56 AA |
1543 | iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL); |
1544 | if (!iio_dev_opaque) | |
0d4b2184 JC |
1545 | return NULL; |
1546 | ||
6d4ebd56 AA |
1547 | dev = &iio_dev_opaque->indio_dev; |
1548 | dev->priv = (char *)iio_dev_opaque + | |
1549 | ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN); | |
1550 | ||
8525df47 | 1551 | dev->dev.parent = parent; |
0d4b2184 JC |
1552 | dev->dev.groups = dev->groups; |
1553 | dev->dev.type = &iio_device_type; | |
1554 | dev->dev.bus = &iio_bus_type; | |
1555 | device_initialize(&dev->dev); | |
1556 | dev_set_drvdata(&dev->dev, (void *)dev); | |
1557 | mutex_init(&dev->mlock); | |
1558 | mutex_init(&dev->info_exist_lock); | |
207c2d27 | 1559 | INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list); |
0d4b2184 JC |
1560 | |
1561 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
1562 | if (dev->id < 0) { | |
1563 | /* cannot use a dev_err as the name isn't available */ | |
1564 | pr_err("failed to get device id\n"); | |
6d4ebd56 | 1565 | kfree(iio_dev_opaque); |
0d4b2184 | 1566 | return NULL; |
847ec80b | 1567 | } |
0d4b2184 | 1568 | dev_set_name(&dev->dev, "iio:device%d", dev->id); |
6a8c6b26 | 1569 | INIT_LIST_HEAD(&iio_dev_opaque->buffer_list); |
847ec80b JC |
1570 | |
1571 | return dev; | |
1572 | } | |
7cbb7537 | 1573 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1574 | |
a7e57dce SK |
1575 | /** |
1576 | * iio_device_free() - free an iio_dev from a driver | |
1577 | * @dev: the iio_dev associated with the device | |
1578 | **/ | |
7cbb7537 | 1579 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1580 | { |
e407fd65 LPC |
1581 | if (dev) |
1582 | put_device(&dev->dev); | |
847ec80b | 1583 | } |
7cbb7537 | 1584 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1585 | |
9dabaf5e GS |
1586 | static void devm_iio_device_release(struct device *dev, void *res) |
1587 | { | |
1588 | iio_device_free(*(struct iio_dev **)res); | |
1589 | } | |
1590 | ||
a7e57dce SK |
1591 | /** |
1592 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
78289b4a | 1593 | * @parent: Device to allocate iio_dev for, and parent for this IIO device |
a7e57dce SK |
1594 | * @sizeof_priv: Space to allocate for private structure. |
1595 | * | |
1596 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1597 | * automatically freed on driver detach. | |
1598 | * | |
a7e57dce SK |
1599 | * RETURNS: |
1600 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1601 | */ | |
78289b4a | 1602 | struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv) |
9dabaf5e GS |
1603 | { |
1604 | struct iio_dev **ptr, *iio_dev; | |
1605 | ||
1606 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1607 | GFP_KERNEL); | |
1608 | if (!ptr) | |
1609 | return NULL; | |
1610 | ||
78289b4a | 1611 | iio_dev = iio_device_alloc(parent, sizeof_priv); |
9dabaf5e GS |
1612 | if (iio_dev) { |
1613 | *ptr = iio_dev; | |
78289b4a | 1614 | devres_add(parent, ptr); |
9dabaf5e GS |
1615 | } else { |
1616 | devres_free(ptr); | |
1617 | } | |
1618 | ||
1619 | return iio_dev; | |
1620 | } | |
1621 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1622 | ||
1aa04278 | 1623 | /** |
14555b14 | 1624 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6 CO |
1625 | * @inode: Inode structure for identifying the device in the file system |
1626 | * @filp: File structure for iio device used to keep and later access | |
1627 | * private data | |
1628 | * | |
1629 | * Return: 0 on success or -EBUSY if the device is already opened | |
1aa04278 JC |
1630 | **/ |
1631 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1632 | { | |
f8c6f4e9 | 1633 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1634 | struct iio_dev, chrdev); |
bb01443e LPC |
1635 | |
1636 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1637 | return -EBUSY; | |
1638 | ||
cadc2125 LPC |
1639 | iio_device_get(indio_dev); |
1640 | ||
f8c6f4e9 | 1641 | filp->private_data = indio_dev; |
30eb82f0 | 1642 | |
79335140 | 1643 | return 0; |
1aa04278 JC |
1644 | } |
1645 | ||
1646 | /** | |
14555b14 | 1647 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6 CO |
1648 | * @inode: Inode structure pointer for the char device |
1649 | * @filp: File structure pointer for the char device | |
1650 | * | |
1651 | * Return: 0 for successful release | |
1652 | */ | |
1aa04278 JC |
1653 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1654 | { | |
bb01443e LPC |
1655 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1656 | struct iio_dev, chrdev); | |
bb01443e | 1657 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1658 | iio_device_put(indio_dev); |
1659 | ||
1aa04278 JC |
1660 | return 0; |
1661 | } | |
1662 | ||
1663 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1664 | * event related */ | |
1665 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1666 | { | |
1667 | struct iio_dev *indio_dev = filp->private_data; | |
1668 | int __user *ip = (int __user *)arg; | |
1669 | int fd; | |
1670 | ||
f18e7a06 LPC |
1671 | if (!indio_dev->info) |
1672 | return -ENODEV; | |
1673 | ||
1aa04278 JC |
1674 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1675 | fd = iio_event_getfd(indio_dev); | |
3f9059b7 LW |
1676 | if (fd < 0) |
1677 | return fd; | |
1aa04278 JC |
1678 | if (copy_to_user(ip, &fd, sizeof(fd))) |
1679 | return -EFAULT; | |
1680 | return 0; | |
1681 | } | |
1682 | return -EINVAL; | |
1683 | } | |
1684 | ||
14555b14 | 1685 | static const struct file_operations iio_buffer_fileops = { |
f6d4033d | 1686 | .read = iio_buffer_read_outer_addr, |
1aa04278 JC |
1687 | .release = iio_chrdev_release, |
1688 | .open = iio_chrdev_open, | |
14555b14 | 1689 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1690 | .owner = THIS_MODULE, |
1691 | .llseek = noop_llseek, | |
1692 | .unlocked_ioctl = iio_ioctl, | |
1832f2d8 | 1693 | .compat_ioctl = compat_ptr_ioctl, |
1aa04278 JC |
1694 | }; |
1695 | ||
8f5d8727 VD |
1696 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1697 | { | |
1698 | int i, j; | |
1699 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1700 | ||
1701 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1702 | return 0; | |
1703 | ||
1704 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1705 | if (channels[i].scan_index < 0) | |
1706 | continue; | |
1707 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1708 | if (channels[i].scan_index == channels[j].scan_index) { | |
1709 | dev_err(&indio_dev->dev, | |
1710 | "Duplicate scan index %d\n", | |
1711 | channels[i].scan_index); | |
1712 | return -EINVAL; | |
1713 | } | |
1714 | } | |
1715 | ||
1716 | return 0; | |
1717 | } | |
1718 | ||
0f1acee5 MH |
1719 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1720 | ||
63b19547 | 1721 | int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) |
847ec80b JC |
1722 | { |
1723 | int ret; | |
1724 | ||
a17cb784 AA |
1725 | if (!indio_dev->info) |
1726 | return -EINVAL; | |
1727 | ||
63b19547 | 1728 | indio_dev->driver_module = this_mod; |
17d82b47 GR |
1729 | /* If the calling driver did not initialize of_node, do it here */ |
1730 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1731 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1732 | ||
2c3d0c9f PR |
1733 | indio_dev->label = of_get_property(indio_dev->dev.of_node, "label", |
1734 | NULL); | |
1735 | ||
8f5d8727 VD |
1736 | ret = iio_check_unique_scan_index(indio_dev); |
1737 | if (ret < 0) | |
1738 | return ret; | |
1739 | ||
1aa04278 | 1740 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1741 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1742 | |
8915aaca | 1743 | iio_device_register_debugfs(indio_dev); |
3e1b6c95 LPC |
1744 | |
1745 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1746 | if (ret) { | |
1747 | dev_err(indio_dev->dev.parent, | |
1748 | "Failed to create buffer sysfs interfaces\n"); | |
1749 | goto error_unreg_debugfs; | |
1750 | } | |
1751 | ||
f8c6f4e9 | 1752 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1753 | if (ret) { |
f8c6f4e9 | 1754 | dev_err(indio_dev->dev.parent, |
847ec80b | 1755 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1756 | goto error_buffer_free_sysfs; |
847ec80b | 1757 | } |
f8c6f4e9 | 1758 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1759 | if (ret) { |
f8c6f4e9 | 1760 | dev_err(indio_dev->dev.parent, |
c849d253 | 1761 | "Failed to register event set\n"); |
847ec80b JC |
1762 | goto error_free_sysfs; |
1763 | } | |
d89e119a | 1764 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
f8c6f4e9 | 1765 | iio_device_register_trigger_consumer(indio_dev); |
847ec80b | 1766 | |
0f1acee5 MH |
1767 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1768 | indio_dev->setup_ops == NULL) | |
1769 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1770 | ||
f8c6f4e9 | 1771 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
63b19547 JC |
1772 | |
1773 | indio_dev->chrdev.owner = this_mod; | |
847ec80b | 1774 | |
38923911 | 1775 | ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev); |
0d5b7dae | 1776 | if (ret < 0) |
38923911 | 1777 | goto error_unreg_eventset; |
0d5b7dae LPC |
1778 | |
1779 | return 0; | |
38923911 | 1780 | |
26d25ae3 | 1781 | error_unreg_eventset: |
f8c6f4e9 | 1782 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1783 | error_free_sysfs: |
f8c6f4e9 | 1784 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1785 | error_buffer_free_sysfs: |
1786 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1787 | error_unreg_debugfs: |
1788 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1789 | return ret; |
1790 | } | |
63b19547 | 1791 | EXPORT_SYMBOL(__iio_device_register); |
847ec80b | 1792 | |
a7e57dce SK |
1793 | /** |
1794 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1795 | * @indio_dev: Device structure representing the device. | |
1796 | **/ | |
f8c6f4e9 | 1797 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1798 | { |
38923911 | 1799 | cdev_device_del(&indio_dev->chrdev, &indio_dev->dev); |
a87c82e4 | 1800 | |
7f75591f FG |
1801 | mutex_lock(&indio_dev->info_exist_lock); |
1802 | ||
bc4c9612 | 1803 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1804 | |
a87c82e4 LPC |
1805 | iio_disable_all_buffers(indio_dev); |
1806 | ||
ac917a81 | 1807 | indio_dev->info = NULL; |
d2f0a48f LPC |
1808 | |
1809 | iio_device_wakeup_eventset(indio_dev); | |
1810 | iio_buffer_wakeup_poll(indio_dev); | |
1811 | ||
ac917a81 | 1812 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1813 | |
1814 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1815 | } |
1816 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1817 | |
1818 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1819 | { | |
1820 | iio_device_unregister(*(struct iio_dev **)res); | |
1821 | } | |
1822 | ||
63b19547 JC |
1823 | int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, |
1824 | struct module *this_mod) | |
8caa07c0 SK |
1825 | { |
1826 | struct iio_dev **ptr; | |
1827 | int ret; | |
1828 | ||
1829 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1830 | if (!ptr) | |
1831 | return -ENOMEM; | |
1832 | ||
1833 | *ptr = indio_dev; | |
63b19547 | 1834 | ret = __iio_device_register(indio_dev, this_mod); |
8caa07c0 SK |
1835 | if (!ret) |
1836 | devres_add(dev, ptr); | |
1837 | else | |
1838 | devres_free(ptr); | |
1839 | ||
1840 | return ret; | |
1841 | } | |
63b19547 | 1842 | EXPORT_SYMBOL_GPL(__devm_iio_device_register); |
8caa07c0 | 1843 | |
08a33805 AS |
1844 | /** |
1845 | * iio_device_claim_direct_mode - Keep device in direct mode | |
1846 | * @indio_dev: the iio_dev associated with the device | |
1847 | * | |
1848 | * If the device is in direct mode it is guaranteed to stay | |
1849 | * that way until iio_device_release_direct_mode() is called. | |
1850 | * | |
1851 | * Use with iio_device_release_direct_mode() | |
1852 | * | |
1853 | * Returns: 0 on success, -EBUSY on failure | |
1854 | */ | |
1855 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) | |
1856 | { | |
1857 | mutex_lock(&indio_dev->mlock); | |
1858 | ||
1859 | if (iio_buffer_enabled(indio_dev)) { | |
1860 | mutex_unlock(&indio_dev->mlock); | |
1861 | return -EBUSY; | |
1862 | } | |
1863 | return 0; | |
1864 | } | |
1865 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); | |
1866 | ||
1867 | /** | |
1868 | * iio_device_release_direct_mode - releases claim on direct mode | |
1869 | * @indio_dev: the iio_dev associated with the device | |
1870 | * | |
1871 | * Release the claim. Device is no longer guaranteed to stay | |
1872 | * in direct mode. | |
1873 | * | |
1874 | * Use with iio_device_claim_direct_mode() | |
1875 | */ | |
1876 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) | |
1877 | { | |
1878 | mutex_unlock(&indio_dev->mlock); | |
1879 | } | |
1880 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); | |
1881 | ||
847ec80b JC |
1882 | subsys_initcall(iio_init); |
1883 | module_exit(iio_exit); | |
1884 | ||
c8b95952 | 1885 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1886 | MODULE_DESCRIPTION("Industrial I/O core"); |
1887 | MODULE_LICENSE("GPL"); |