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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/drivers/iio/industrialio-core.c
....@@ -1,10 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /* The industrial I/O core
23  *
34  * Copyright (c) 2008 Jonathan Cameron
4
- *
5
- * This program is free software; you can redistribute it and/or modify it
6
- * under the terms of the GNU General Public License version 2 as published by
7
- * the Free Software Foundation.
85  *
96  * Based on elements of hwmon and input subsystems.
107  */
....@@ -19,6 +16,7 @@
1916 #include <linux/device.h>
2017 #include <linux/fs.h>
2118 #include <linux/poll.h>
19
+#include <linux/property.h>
2220 #include <linux/sched.h>
2321 #include <linux/wait.h>
2422 #include <linux/cdev.h>
....@@ -27,6 +25,7 @@
2725 #include <linux/debugfs.h>
2826 #include <linux/mutex.h>
2927 #include <linux/iio/iio.h>
28
+#include <linux/iio/iio-opaque.h>
3029 #include "iio_core.h"
3130 #include "iio_core_trigger.h"
3231 #include <linux/iio/sysfs.h>
....@@ -87,6 +86,17 @@
8786 	[IIO_GRAVITY]  = "gravity",
8887 	[IIO_POSITIONRELATIVE]  = "positionrelative",
8988 	[IIO_PHASE] = "phase",
89
+	[IIO_MASSCONCENTRATION] = "massconcentration",
90
+#ifdef CONFIG_NO_GKI
91
+	[IIO_SIGN_MOTION] = "signmotion",
92
+	[IIO_STEP_DETECTOR] = "stepdetector",
93
+	[IIO_STEP_COUNTER] = "stepcounter",
94
+	[IIO_TILT] = "tilt",
95
+	[IIO_TAP] = "tap",
96
+	[IIO_TAP_TAP] = "taptap",
97
+	[IIO_WRIST_TILT_GESTURE] = "wristtiltgesture",
98
+	[IIO_GESTURE] = "gesture",
99
+#endif
90100 };
91101 
92102 static const char * const iio_modifier_names[] = {
....@@ -127,6 +137,13 @@
127137 	[IIO_MOD_Q] = "q",
128138 	[IIO_MOD_CO2] = "co2",
129139 	[IIO_MOD_VOC] = "voc",
140
+	[IIO_MOD_PM1] = "pm1",
141
+	[IIO_MOD_PM2P5] = "pm2p5",
142
+	[IIO_MOD_PM4] = "pm4",
143
+	[IIO_MOD_PM10] = "pm10",
144
+	[IIO_MOD_ETHANOL] = "ethanol",
145
+	[IIO_MOD_H2] = "h2",
146
+	[IIO_MOD_O2] = "o2",
130147 };
131148 
132149 /* relies on pairs of these shared then separate */
....@@ -158,7 +175,22 @@
158175 	[IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
159176 	[IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
160177 	[IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
178
+	[IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type",
179
+	[IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient",
161180 };
181
+
182
+#if defined(CONFIG_DEBUG_FS)
183
+/*
184
+ * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
185
+ * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined
186
+ */
187
+struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
188
+{
189
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
190
+	return iio_dev_opaque->debugfs_dentry;
191
+}
192
+EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
193
+#endif
162194 
163195 /**
164196  * iio_find_channel_from_si() - get channel from its scan index
....@@ -185,10 +217,16 @@
185217 }
186218 EXPORT_SYMBOL(iio_read_const_attr);
187219 
188
-static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
220
+/**
221
+ * iio_device_set_clock() - Set current timestamping clock for the device
222
+ * @indio_dev: IIO device structure containing the device
223
+ * @clock_id: timestamping clock posix identifier to set.
224
+ */
225
+int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id)
189226 {
190227 	int ret;
191
-	const struct iio_event_interface *ev_int = indio_dev->event_interface;
228
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
229
+	const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface;
192230 
193231 	ret = mutex_lock_interruptible(&indio_dev->mlock);
194232 	if (ret)
....@@ -203,6 +241,7 @@
203241 
204242 	return 0;
205243 }
244
+EXPORT_SYMBOL(iio_device_set_clock);
206245 
207246 /**
208247  * iio_get_time_ns() - utility function to get a time stamp for events etc
....@@ -225,9 +264,9 @@
225264 		ktime_get_coarse_ts64(&tp);
226265 		return timespec64_to_ns(&tp);
227266 	case CLOCK_BOOTTIME:
228
-		return ktime_get_boot_ns();
267
+		return ktime_get_boottime_ns();
229268 	case CLOCK_TAI:
230
-		return ktime_get_tai_ns();
269
+		return ktime_get_clocktai_ns();
231270 	default:
232271 		BUG();
233272 	}
....@@ -297,28 +336,37 @@
297336 			      size_t count, loff_t *ppos)
298337 {
299338 	struct iio_dev *indio_dev = file->private_data;
300
-	char buf[20];
339
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
301340 	unsigned val = 0;
302
-	ssize_t len;
303341 	int ret;
304342 
343
+	if (*ppos > 0)
344
+		return simple_read_from_buffer(userbuf, count, ppos,
345
+					       iio_dev_opaque->read_buf,
346
+					       iio_dev_opaque->read_buf_len);
347
+
305348 	ret = indio_dev->info->debugfs_reg_access(indio_dev,
306
-						  indio_dev->cached_reg_addr,
349
+						  iio_dev_opaque->cached_reg_addr,
307350 						  0, &val);
308351 	if (ret) {
309352 		dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
310353 		return ret;
311354 	}
312355 
313
-	len = snprintf(buf, sizeof(buf), "0x%X\n", val);
356
+	iio_dev_opaque->read_buf_len = snprintf(iio_dev_opaque->read_buf,
357
+					      sizeof(iio_dev_opaque->read_buf),
358
+					      "0x%X\n", val);
314359 
315
-	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
360
+	return simple_read_from_buffer(userbuf, count, ppos,
361
+				       iio_dev_opaque->read_buf,
362
+				       iio_dev_opaque->read_buf_len);
316363 }
317364 
318365 static ssize_t iio_debugfs_write_reg(struct file *file,
319366 		     const char __user *userbuf, size_t count, loff_t *ppos)
320367 {
321368 	struct iio_dev *indio_dev = file->private_data;
369
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
322370 	unsigned reg, val;
323371 	char buf[80];
324372 	int ret;
....@@ -333,10 +381,10 @@
333381 
334382 	switch (ret) {
335383 	case 1:
336
-		indio_dev->cached_reg_addr = reg;
384
+		iio_dev_opaque->cached_reg_addr = reg;
337385 		break;
338386 	case 2:
339
-		indio_dev->cached_reg_addr = reg;
387
+		iio_dev_opaque->cached_reg_addr = reg;
340388 		ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
341389 							  val, NULL);
342390 		if (ret) {
....@@ -360,42 +408,33 @@
360408 
361409 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
362410 {
363
-	debugfs_remove_recursive(indio_dev->debugfs_dentry);
411
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
412
+	debugfs_remove_recursive(iio_dev_opaque->debugfs_dentry);
364413 }
365414 
366
-static int iio_device_register_debugfs(struct iio_dev *indio_dev)
415
+static void iio_device_register_debugfs(struct iio_dev *indio_dev)
367416 {
368
-	struct dentry *d;
417
+	struct iio_dev_opaque *iio_dev_opaque;
369418 
370419 	if (indio_dev->info->debugfs_reg_access == NULL)
371
-		return 0;
420
+		return;
372421 
373422 	if (!iio_debugfs_dentry)
374
-		return 0;
423
+		return;
375424 
376
-	indio_dev->debugfs_dentry =
425
+	iio_dev_opaque = to_iio_dev_opaque(indio_dev);
426
+
427
+	iio_dev_opaque->debugfs_dentry =
377428 		debugfs_create_dir(dev_name(&indio_dev->dev),
378429 				   iio_debugfs_dentry);
379
-	if (indio_dev->debugfs_dentry == NULL) {
380
-		dev_warn(indio_dev->dev.parent,
381
-			 "Failed to create debugfs directory\n");
382
-		return -EFAULT;
383
-	}
384430 
385
-	d = debugfs_create_file("direct_reg_access", 0644,
386
-				indio_dev->debugfs_dentry,
387
-				indio_dev, &iio_debugfs_reg_fops);
388
-	if (!d) {
389
-		iio_device_unregister_debugfs(indio_dev);
390
-		return -ENOMEM;
391
-	}
392
-
393
-	return 0;
431
+	debugfs_create_file("direct_reg_access", 0644,
432
+			    iio_dev_opaque->debugfs_dentry, indio_dev,
433
+			    &iio_debugfs_reg_fops);
394434 }
395435 #else
396
-static int iio_device_register_debugfs(struct iio_dev *indio_dev)
436
+static void iio_device_register_debugfs(struct iio_dev *indio_dev)
397437 {
398
-	return 0;
399438 }
400439 
401440 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
....@@ -525,8 +564,8 @@
525564 EXPORT_SYMBOL_GPL(iio_show_mount_matrix);
526565 
527566 /**
528
- * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from
529
- *                              device-tree "mount-matrix" property
567
+ * iio_read_mount_matrix() - retrieve iio device mounting matrix from
568
+ *                           device "mount-matrix" property
530569  * @dev:	device the mounting matrix property is assigned to
531570  * @propname:	device specific mounting matrix property name
532571  * @matrix:	where to store retrieved matrix
....@@ -536,40 +575,29 @@
536575  *
537576  * Return: 0 if success, or a negative error code on failure.
538577  */
539
-#ifdef CONFIG_OF
540
-int of_iio_read_mount_matrix(const struct device *dev,
541
-			     const char *propname,
542
-			     struct iio_mount_matrix *matrix)
578
+int iio_read_mount_matrix(struct device *dev, const char *propname,
579
+			  struct iio_mount_matrix *matrix)
543580 {
544
-	if (dev->of_node) {
545
-		int err = of_property_read_string_array(dev->of_node,
546
-				propname, matrix->rotation,
547
-				ARRAY_SIZE(iio_mount_idmatrix.rotation));
581
+	size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation);
582
+	int err;
548583 
549
-		if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation))
550
-			return 0;
584
+	err = device_property_read_string_array(dev, propname,
585
+						matrix->rotation, len);
586
+	if (err == len)
587
+		return 0;
551588 
552
-		if (err >= 0)
553
-			/* Invalid number of matrix entries. */
554
-			return -EINVAL;
589
+	if (err >= 0)
590
+		/* Invalid number of matrix entries. */
591
+		return -EINVAL;
555592 
556
-		if (err != -EINVAL)
557
-			/* Invalid matrix declaration format. */
558
-			return err;
559
-	}
593
+	if (err != -EINVAL)
594
+		/* Invalid matrix declaration format. */
595
+		return err;
560596 
561597 	/* Matrix was not declared at all: fallback to identity. */
562598 	return iio_setup_mount_idmatrix(dev, matrix);
563599 }
564
-#else
565
-int of_iio_read_mount_matrix(const struct device *dev,
566
-			     const char *propname,
567
-			     struct iio_mount_matrix *matrix)
568
-{
569
-	return iio_setup_mount_idmatrix(dev, matrix);
570
-}
571
-#endif
572
-EXPORT_SYMBOL(of_iio_read_mount_matrix);
600
+EXPORT_SYMBOL(iio_read_mount_matrix);
573601 
574602 static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type,
575603 				  int size, const int *vals)
....@@ -580,44 +608,46 @@
580608 
581609 	switch (type) {
582610 	case IIO_VAL_INT:
583
-		return snprintf(buf, len, "%d", vals[0]);
611
+		return scnprintf(buf, len, "%d", vals[0]);
584612 	case IIO_VAL_INT_PLUS_MICRO_DB:
585613 		scale_db = true;
586
-		/* fall through */
614
+		fallthrough;
587615 	case IIO_VAL_INT_PLUS_MICRO:
588616 		if (vals[1] < 0)
589
-			return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
617
+			return scnprintf(buf, len, "-%d.%06u%s", abs(vals[0]),
590618 					-vals[1], scale_db ? " dB" : "");
591619 		else
592
-			return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
620
+			return scnprintf(buf, len, "%d.%06u%s", vals[0], vals[1],
593621 					scale_db ? " dB" : "");
594622 	case IIO_VAL_INT_PLUS_NANO:
595623 		if (vals[1] < 0)
596
-			return snprintf(buf, len, "-%d.%09u", abs(vals[0]),
624
+			return scnprintf(buf, len, "-%d.%09u", abs(vals[0]),
597625 					-vals[1]);
598626 		else
599
-			return snprintf(buf, len, "%d.%09u", vals[0], vals[1]);
627
+			return scnprintf(buf, len, "%d.%09u", vals[0], vals[1]);
600628 	case IIO_VAL_FRACTIONAL:
601629 		tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]);
602630 		tmp1 = vals[1];
603631 		tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1);
604
-		return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
632
+		return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
605633 	case IIO_VAL_FRACTIONAL_LOG2:
606634 		tmp = shift_right((s64)vals[0] * 1000000000LL, vals[1]);
607635 		tmp0 = (int)div_s64_rem(tmp, 1000000000LL, &tmp1);
608
-		return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
636
+		return scnprintf(buf, len, "%d.%09u", tmp0, abs(tmp1));
609637 	case IIO_VAL_INT_MULTIPLE:
610638 	{
611639 		int i;
612640 		int l = 0;
613641 
614642 		for (i = 0; i < size; ++i) {
615
-			l += snprintf(&buf[l], len - l, "%d ", vals[i]);
643
+			l += scnprintf(&buf[l], len - l, "%d ", vals[i]);
616644 			if (l >= len)
617645 				break;
618646 		}
619647 		return l;
620648 	}
649
+	case IIO_VAL_CHAR:
650
+		return scnprintf(buf, len, "%c", (char)vals[0]);
621651 	default:
622652 		return 0;
623653 	}
....@@ -688,10 +718,10 @@
688718 			if (len >= PAGE_SIZE)
689719 				return -EFBIG;
690720 			if (i < length - 1)
691
-				len += snprintf(buf + len, PAGE_SIZE - len,
721
+				len += scnprintf(buf + len, PAGE_SIZE - len,
692722 						" ");
693723 			else
694
-				len += snprintf(buf + len, PAGE_SIZE - len,
724
+				len += scnprintf(buf + len, PAGE_SIZE - len,
695725 						"\n");
696726 			if (len >= PAGE_SIZE)
697727 				return -EFBIG;
....@@ -704,10 +734,10 @@
704734 			if (len >= PAGE_SIZE)
705735 				return -EFBIG;
706736 			if (i < length / 2 - 1)
707
-				len += snprintf(buf + len, PAGE_SIZE - len,
737
+				len += scnprintf(buf + len, PAGE_SIZE - len,
708738 						" ");
709739 			else
710
-				len += snprintf(buf + len, PAGE_SIZE - len,
740
+				len += scnprintf(buf + len, PAGE_SIZE - len,
711741 						"\n");
712742 			if (len >= PAGE_SIZE)
713743 				return -EFBIG;
....@@ -731,10 +761,10 @@
731761 			if (len >= PAGE_SIZE)
732762 				return -EFBIG;
733763 			if (i < 2)
734
-				len += snprintf(buf + len, PAGE_SIZE - len,
764
+				len += scnprintf(buf + len, PAGE_SIZE - len,
735765 						" ");
736766 			else
737
-				len += snprintf(buf + len, PAGE_SIZE - len,
767
+				len += scnprintf(buf + len, PAGE_SIZE - len,
738768 						"]\n");
739769 			if (len >= PAGE_SIZE)
740770 				return -EFBIG;
....@@ -747,10 +777,10 @@
747777 			if (len >= PAGE_SIZE)
748778 				return -EFBIG;
749779 			if (i < 2)
750
-				len += snprintf(buf + len, PAGE_SIZE - len,
780
+				len += scnprintf(buf + len, PAGE_SIZE - len,
751781 						" ");
752782 			else
753
-				len += snprintf(buf + len, PAGE_SIZE - len,
783
+				len += scnprintf(buf + len, PAGE_SIZE - len,
754784 						"]\n");
755785 			if (len >= PAGE_SIZE)
756786 				return -EFBIG;
....@@ -788,17 +818,18 @@
788818 }
789819 
790820 /**
791
- * iio_str_to_fixpoint() - Parse a fixed-point number from a string
821
+ * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
792822  * @str: The string to parse
793823  * @fract_mult: Multiplier for the first decimal place, should be a power of 10
794824  * @integer: The integer part of the number
795825  * @fract: The fractional part of the number
826
+ * @scale_db: True if this should parse as dB
796827  *
797828  * Returns 0 on success, or a negative error code if the string could not be
798829  * parsed.
799830  */
800
-int iio_str_to_fixpoint(const char *str, int fract_mult,
801
-	int *integer, int *fract)
831
+static int __iio_str_to_fixpoint(const char *str, int fract_mult,
832
+				 int *integer, int *fract, bool scale_db)
802833 {
803834 	int i = 0, f = 0;
804835 	bool integer_part = true, negative = false;
....@@ -829,6 +860,14 @@
829860 				break;
830861 			else
831862 				return -EINVAL;
863
+		} else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
864
+			/* Ignore the dB suffix */
865
+			str += sizeof(" dB") - 1;
866
+			continue;
867
+		} else if (!strncmp(str, "dB", sizeof("dB") - 1) && scale_db) {
868
+			/* Ignore the dB suffix */
869
+			str += sizeof("dB") - 1;
870
+			continue;
832871 		} else if (*str == '.' && integer_part) {
833872 			integer_part = false;
834873 		} else {
....@@ -849,6 +888,22 @@
849888 
850889 	return 0;
851890 }
891
+
892
+/**
893
+ * iio_str_to_fixpoint() - Parse a fixed-point number from a string
894
+ * @str: The string to parse
895
+ * @fract_mult: Multiplier for the first decimal place, should be a power of 10
896
+ * @integer: The integer part of the number
897
+ * @fract: The fractional part of the number
898
+ *
899
+ * Returns 0 on success, or a negative error code if the string could not be
900
+ * parsed.
901
+ */
902
+int iio_str_to_fixpoint(const char *str, int fract_mult,
903
+			int *integer, int *fract)
904
+{
905
+	return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
906
+}
852907 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
853908 
854909 static ssize_t iio_write_channel_info(struct device *dev,
....@@ -859,7 +914,9 @@
859914 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
860915 	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
861916 	int ret, fract_mult = 100000;
862
-	int integer, fract;
917
+	int integer, fract = 0;
918
+	bool is_char = false;
919
+	bool scale_db = false;
863920 
864921 	/* Assumes decimal - precision based on number of digits */
865922 	if (!indio_dev->info->write_raw)
....@@ -871,19 +928,34 @@
871928 		case IIO_VAL_INT:
872929 			fract_mult = 0;
873930 			break;
931
+		case IIO_VAL_INT_PLUS_MICRO_DB:
932
+			scale_db = true;
933
+			fallthrough;
874934 		case IIO_VAL_INT_PLUS_MICRO:
875935 			fract_mult = 100000;
876936 			break;
877937 		case IIO_VAL_INT_PLUS_NANO:
878938 			fract_mult = 100000000;
879939 			break;
940
+		case IIO_VAL_CHAR:
941
+			is_char = true;
942
+			break;
880943 		default:
881944 			return -EINVAL;
882945 		}
883946 
884
-	ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract);
885
-	if (ret)
886
-		return ret;
947
+	if (is_char) {
948
+		char ch;
949
+
950
+		if (sscanf(buf, "%c", &ch) != 1)
951
+			return -EINVAL;
952
+		integer = ch;
953
+	} else {
954
+		ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
955
+					    scale_db);
956
+		if (ret)
957
+			return ret;
958
+	}
887959 
888960 	ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
889961 					 integer, fract, this_attr->address);
....@@ -1080,6 +1152,7 @@
10801152 					 enum iio_shared_by shared_by,
10811153 					 const long *infomask)
10821154 {
1155
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
10831156 	int i, ret, attrcount = 0;
10841157 
10851158 	for_each_set_bit(i, infomask, sizeof(*infomask)*8) {
....@@ -1092,7 +1165,7 @@
10921165 					     i,
10931166 					     shared_by,
10941167 					     &indio_dev->dev,
1095
-					     &indio_dev->channel_attr_list);
1168
+					     &iio_dev_opaque->channel_attr_list);
10961169 		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
10971170 			continue;
10981171 		else if (ret < 0)
....@@ -1108,10 +1181,13 @@
11081181 					       enum iio_shared_by shared_by,
11091182 					       const long *infomask)
11101183 {
1184
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
11111185 	int i, ret, attrcount = 0;
11121186 	char *avail_postfix;
11131187 
11141188 	for_each_set_bit(i, infomask, sizeof(*infomask) * 8) {
1189
+		if (i >= ARRAY_SIZE(iio_chan_info_postfix))
1190
+			return -EINVAL;
11151191 		avail_postfix = kasprintf(GFP_KERNEL,
11161192 					  "%s_available",
11171193 					  iio_chan_info_postfix[i]);
....@@ -1125,7 +1201,7 @@
11251201 					     i,
11261202 					     shared_by,
11271203 					     &indio_dev->dev,
1128
-					     &indio_dev->channel_attr_list);
1204
+					     &iio_dev_opaque->channel_attr_list);
11291205 		kfree(avail_postfix);
11301206 		if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE))
11311207 			continue;
....@@ -1140,6 +1216,7 @@
11401216 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
11411217 					struct iio_chan_spec const *chan)
11421218 {
1219
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
11431220 	int ret, attrcount = 0;
11441221 	const struct iio_chan_spec_ext_info *ext_info;
11451222 
....@@ -1215,7 +1292,7 @@
12151292 					i,
12161293 					ext_info->shared,
12171294 					&indio_dev->dev,
1218
-					&indio_dev->channel_attr_list);
1295
+					&iio_dev_opaque->channel_attr_list);
12191296 			i++;
12201297 			if (ret == -EBUSY && ext_info->shared)
12211298 				continue;
....@@ -1257,6 +1334,16 @@
12571334 }
12581335 
12591336 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
1337
+
1338
+static ssize_t iio_show_dev_label(struct device *dev,
1339
+				 struct device_attribute *attr,
1340
+				 char *buf)
1341
+{
1342
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
1343
+	return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->label);
1344
+}
1345
+
1346
+static DEVICE_ATTR(label, S_IRUGO, iio_show_dev_label, NULL);
12601347 
12611348 static ssize_t iio_show_timestamp_clock(struct device *dev,
12621349 					struct device_attribute *attr,
....@@ -1340,6 +1427,7 @@
13401427 
13411428 static int iio_device_register_sysfs(struct iio_dev *indio_dev)
13421429 {
1430
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
13431431 	int i, ret = 0, attrcount, attrn, attrcount_orig = 0;
13441432 	struct iio_dev_attr *p;
13451433 	struct attribute **attr, *clk = NULL;
....@@ -1369,58 +1457,66 @@
13691457 			attrcount += ret;
13701458 		}
13711459 
1372
-	if (indio_dev->event_interface)
1460
+	if (iio_dev_opaque->event_interface)
13731461 		clk = &dev_attr_current_timestamp_clock.attr;
13741462 
13751463 	if (indio_dev->name)
13761464 		attrcount++;
1465
+	if (indio_dev->label)
1466
+		attrcount++;
13771467 	if (clk)
13781468 		attrcount++;
13791469 
1380
-	indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1,
1381
-						   sizeof(indio_dev->chan_attr_group.attrs[0]),
1382
-						   GFP_KERNEL);
1383
-	if (indio_dev->chan_attr_group.attrs == NULL) {
1470
+	iio_dev_opaque->chan_attr_group.attrs =
1471
+		kcalloc(attrcount + 1,
1472
+			sizeof(iio_dev_opaque->chan_attr_group.attrs[0]),
1473
+			GFP_KERNEL);
1474
+	if (iio_dev_opaque->chan_attr_group.attrs == NULL) {
13841475 		ret = -ENOMEM;
13851476 		goto error_clear_attrs;
13861477 	}
13871478 	/* Copy across original attributes */
13881479 	if (indio_dev->info->attrs)
1389
-		memcpy(indio_dev->chan_attr_group.attrs,
1480
+		memcpy(iio_dev_opaque->chan_attr_group.attrs,
13901481 		       indio_dev->info->attrs->attrs,
1391
-		       sizeof(indio_dev->chan_attr_group.attrs[0])
1482
+		       sizeof(iio_dev_opaque->chan_attr_group.attrs[0])
13921483 		       *attrcount_orig);
13931484 	attrn = attrcount_orig;
13941485 	/* Add all elements from the list. */
1395
-	list_for_each_entry(p, &indio_dev->channel_attr_list, l)
1396
-		indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
1486
+	list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l)
1487
+		iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr;
13971488 	if (indio_dev->name)
1398
-		indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1489
+		iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr;
1490
+	if (indio_dev->label)
1491
+		iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr;
13991492 	if (clk)
1400
-		indio_dev->chan_attr_group.attrs[attrn++] = clk;
1493
+		iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk;
14011494 
14021495 	indio_dev->groups[indio_dev->groupcounter++] =
1403
-		&indio_dev->chan_attr_group;
1496
+		&iio_dev_opaque->chan_attr_group;
14041497 
14051498 	return 0;
14061499 
14071500 error_clear_attrs:
1408
-	iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1501
+	iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
14091502 
14101503 	return ret;
14111504 }
14121505 
14131506 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
14141507 {
1508
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
14151509 
1416
-	iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
1417
-	kfree(indio_dev->chan_attr_group.attrs);
1418
-	indio_dev->chan_attr_group.attrs = NULL;
1510
+	iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list);
1511
+	kfree(iio_dev_opaque->chan_attr_group.attrs);
1512
+	iio_dev_opaque->chan_attr_group.attrs = NULL;
14191513 }
14201514 
14211515 static void iio_dev_release(struct device *device)
14221516 {
14231517 	struct iio_dev *indio_dev = dev_to_iio_dev(device);
1518
+	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
1519
+
14241520 	if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES)
14251521 		iio_device_unregister_trigger_consumer(indio_dev);
14261522 	iio_device_unregister_eventset(indio_dev);
....@@ -1429,7 +1525,7 @@
14291525 	iio_buffer_put(indio_dev->buffer);
14301526 
14311527 	ida_simple_remove(&iio_ida, indio_dev->id);
1432
-	kfree(indio_dev);
1528
+	kfree(iio_dev_opaque);
14331529 }
14341530 
14351531 struct device_type iio_device_type = {
....@@ -1439,43 +1535,48 @@
14391535 
14401536 /**
14411537  * iio_device_alloc() - allocate an iio_dev from a driver
1538
+ * @parent:		Parent device.
14421539  * @sizeof_priv:	Space to allocate for private structure.
14431540  **/
1444
-struct iio_dev *iio_device_alloc(int sizeof_priv)
1541
+struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
14451542 {
1543
+	struct iio_dev_opaque *iio_dev_opaque;
14461544 	struct iio_dev *dev;
14471545 	size_t alloc_size;
14481546 
1449
-	alloc_size = sizeof(struct iio_dev);
1547
+	alloc_size = sizeof(struct iio_dev_opaque);
14501548 	if (sizeof_priv) {
14511549 		alloc_size = ALIGN(alloc_size, IIO_ALIGN);
14521550 		alloc_size += sizeof_priv;
14531551 	}
1454
-	/* ensure 32-byte alignment of whole construct ? */
1455
-	alloc_size += IIO_ALIGN - 1;
14561552 
1457
-	dev = kzalloc(alloc_size, GFP_KERNEL);
1553
+	iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
1554
+	if (!iio_dev_opaque)
1555
+		return NULL;
14581556 
1459
-	if (dev) {
1460
-		dev->dev.groups = dev->groups;
1461
-		dev->dev.type = &iio_device_type;
1462
-		dev->dev.bus = &iio_bus_type;
1463
-		device_initialize(&dev->dev);
1464
-		dev_set_drvdata(&dev->dev, (void *)dev);
1465
-		mutex_init(&dev->mlock);
1466
-		mutex_init(&dev->info_exist_lock);
1467
-		INIT_LIST_HEAD(&dev->channel_attr_list);
1557
+	dev = &iio_dev_opaque->indio_dev;
1558
+	dev->priv = (char *)iio_dev_opaque +
1559
+		ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN);
14681560 
1469
-		dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1470
-		if (dev->id < 0) {
1471
-			/* cannot use a dev_err as the name isn't available */
1472
-			pr_err("failed to get device id\n");
1473
-			kfree(dev);
1474
-			return NULL;
1475
-		}
1476
-		dev_set_name(&dev->dev, "iio:device%d", dev->id);
1477
-		INIT_LIST_HEAD(&dev->buffer_list);
1561
+	dev->dev.parent = parent;
1562
+	dev->dev.groups = dev->groups;
1563
+	dev->dev.type = &iio_device_type;
1564
+	dev->dev.bus = &iio_bus_type;
1565
+	device_initialize(&dev->dev);
1566
+	dev_set_drvdata(&dev->dev, (void *)dev);
1567
+	mutex_init(&dev->mlock);
1568
+	mutex_init(&dev->info_exist_lock);
1569
+	INIT_LIST_HEAD(&iio_dev_opaque->channel_attr_list);
1570
+
1571
+	dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL);
1572
+	if (dev->id < 0) {
1573
+		/* cannot use a dev_err as the name isn't available */
1574
+		pr_err("failed to get device id\n");
1575
+		kfree(iio_dev_opaque);
1576
+		return NULL;
14781577 	}
1578
+	dev_set_name(&dev->dev, "iio:device%d", dev->id);
1579
+	INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
14791580 
14801581 	return dev;
14811582 }
....@@ -1497,32 +1598,18 @@
14971598 	iio_device_free(*(struct iio_dev **)res);
14981599 }
14991600 
1500
-int devm_iio_device_match(struct device *dev, void *res, void *data)
1501
-{
1502
-	struct iio_dev **r = res;
1503
-	if (!r || !*r) {
1504
-		WARN_ON(!r || !*r);
1505
-		return 0;
1506
-	}
1507
-	return *r == data;
1508
-}
1509
-EXPORT_SYMBOL_GPL(devm_iio_device_match);
1510
-
15111601 /**
15121602  * devm_iio_device_alloc - Resource-managed iio_device_alloc()
1513
- * @dev:		Device to allocate iio_dev for
1603
+ * @parent:		Device to allocate iio_dev for, and parent for this IIO device
15141604  * @sizeof_priv:	Space to allocate for private structure.
15151605  *
15161606  * Managed iio_device_alloc. iio_dev allocated with this function is
15171607  * automatically freed on driver detach.
15181608  *
1519
- * If an iio_dev allocated with this function needs to be freed separately,
1520
- * devm_iio_device_free() must be used.
1521
- *
15221609  * RETURNS:
15231610  * Pointer to allocated iio_dev on success, NULL on failure.
15241611  */
1525
-struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
1612
+struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv)
15261613 {
15271614 	struct iio_dev **ptr, *iio_dev;
15281615 
....@@ -1531,10 +1618,10 @@
15311618 	if (!ptr)
15321619 		return NULL;
15331620 
1534
-	iio_dev = iio_device_alloc(sizeof_priv);
1621
+	iio_dev = iio_device_alloc(parent, sizeof_priv);
15351622 	if (iio_dev) {
15361623 		*ptr = iio_dev;
1537
-		devres_add(dev, ptr);
1624
+		devres_add(parent, ptr);
15381625 	} else {
15391626 		devres_free(ptr);
15401627 	}
....@@ -1542,23 +1629,6 @@
15421629 	return iio_dev;
15431630 }
15441631 EXPORT_SYMBOL_GPL(devm_iio_device_alloc);
1545
-
1546
-/**
1547
- * devm_iio_device_free - Resource-managed iio_device_free()
1548
- * @dev:		Device this iio_dev belongs to
1549
- * @iio_dev:		the iio_dev associated with the device
1550
- *
1551
- * Free iio_dev allocated with devm_iio_device_alloc().
1552
- */
1553
-void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev)
1554
-{
1555
-	int rc;
1556
-
1557
-	rc = devres_release(dev, devm_iio_device_release,
1558
-			    devm_iio_device_match, iio_dev);
1559
-	WARN_ON(rc);
1560
-}
1561
-EXPORT_SYMBOL_GPL(devm_iio_device_free);
15621632 
15631633 /**
15641634  * iio_chrdev_open() - chrdev file open for buffer access and ioctls
....@@ -1623,14 +1693,14 @@
16231693 }
16241694 
16251695 static const struct file_operations iio_buffer_fileops = {
1626
-	.read = iio_buffer_read_first_n_outer_addr,
1696
+	.read = iio_buffer_read_outer_addr,
16271697 	.release = iio_chrdev_release,
16281698 	.open = iio_chrdev_open,
16291699 	.poll = iio_buffer_poll_addr,
16301700 	.owner = THIS_MODULE,
16311701 	.llseek = noop_llseek,
16321702 	.unlocked_ioctl = iio_ioctl,
1633
-	.compat_ioctl = iio_ioctl,
1703
+	.compat_ioctl = compat_ptr_ioctl,
16341704 };
16351705 
16361706 static int iio_check_unique_scan_index(struct iio_dev *indio_dev)
....@@ -1662,10 +1732,16 @@
16621732 {
16631733 	int ret;
16641734 
1735
+	if (!indio_dev->info)
1736
+		return -EINVAL;
1737
+
16651738 	indio_dev->driver_module = this_mod;
16661739 	/* If the calling driver did not initialize of_node, do it here */
16671740 	if (!indio_dev->dev.of_node && indio_dev->dev.parent)
16681741 		indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
1742
+
1743
+	indio_dev->label = of_get_property(indio_dev->dev.of_node, "label",
1744
+					   NULL);
16691745 
16701746 	ret = iio_check_unique_scan_index(indio_dev);
16711747 	if (ret < 0)
....@@ -1674,12 +1750,7 @@
16741750 	/* configure elements for the chrdev */
16751751 	indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id);
16761752 
1677
-	ret = iio_device_register_debugfs(indio_dev);
1678
-	if (ret) {
1679
-		dev_err(indio_dev->dev.parent,
1680
-			"Failed to register debugfs interfaces\n");
1681
-		return ret;
1682
-	}
1753
+	iio_device_register_debugfs(indio_dev);
16831754 
16841755 	ret = iio_buffer_alloc_sysfs_and_mask(indio_dev);
16851756 	if (ret) {
....@@ -1779,23 +1850,6 @@
17791850 	return ret;
17801851 }
17811852 EXPORT_SYMBOL_GPL(__devm_iio_device_register);
1782
-
1783
-/**
1784
- * devm_iio_device_unregister - Resource-managed iio_device_unregister()
1785
- * @dev:	Device this iio_dev belongs to
1786
- * @indio_dev:	the iio_dev associated with the device
1787
- *
1788
- * Unregister iio_dev registered with devm_iio_device_register().
1789
- */
1790
-void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev)
1791
-{
1792
-	int rc;
1793
-
1794
-	rc = devres_release(dev, devm_iio_device_unreg,
1795
-			    devm_iio_device_match, indio_dev);
1796
-	WARN_ON(rc);
1797
-}
1798
-EXPORT_SYMBOL_GPL(devm_iio_device_unregister);
17991853 
18001854 /**
18011855  * iio_device_claim_direct_mode - Keep device in direct mode