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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/drivers/pinctrl/pinconf.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Core driver for the pin config portions of the pin control subsystem
34  *
....@@ -5,8 +6,6 @@
56  * Written on behalf of Linaro for ST-Ericsson
67  *
78  * Author: Linus Walleij <linus.walleij@linaro.org>
8
- *
9
- * License terms: GNU General Public License (GPL) version 2
109  */
1110 #define pr_fmt(fmt) "pinconfig core: " fmt
1211 
....@@ -17,7 +16,6 @@
1716 #include <linux/slab.h>
1817 #include <linux/debugfs.h>
1918 #include <linux/seq_file.h>
20
-#include <linux/uaccess.h>
2119 #include <linux/pinctrl/machine.h>
2220 #include <linux/pinctrl/pinctrl.h>
2321 #include <linux/pinctrl/pinconf.h>
....@@ -366,258 +364,16 @@
366364 	return 0;
367365 }
368366 
369
-static int pinconf_pins_open(struct inode *inode, struct file *file)
370
-{
371
-	return single_open(file, pinconf_pins_show, inode->i_private);
372
-}
373
-
374
-static int pinconf_groups_open(struct inode *inode, struct file *file)
375
-{
376
-	return single_open(file, pinconf_groups_show, inode->i_private);
377
-}
378
-
379
-static const struct file_operations pinconf_pins_ops = {
380
-	.open		= pinconf_pins_open,
381
-	.read		= seq_read,
382
-	.llseek		= seq_lseek,
383
-	.release	= single_release,
384
-};
385
-
386
-static const struct file_operations pinconf_groups_ops = {
387
-	.open		= pinconf_groups_open,
388
-	.read		= seq_read,
389
-	.llseek		= seq_lseek,
390
-	.release	= single_release,
391
-};
392
-
393
-#define MAX_NAME_LEN 15
394
-
395
-struct dbg_cfg {
396
-	enum pinctrl_map_type map_type;
397
-	char dev_name[MAX_NAME_LEN + 1];
398
-	char state_name[MAX_NAME_LEN + 1];
399
-	char pin_name[MAX_NAME_LEN + 1];
400
-};
401
-
402
-/*
403
- * Goal is to keep this structure as global in order to simply read the
404
- * pinconf-config file after a write to check config is as expected
405
- */
406
-static struct dbg_cfg pinconf_dbg_conf;
407
-
408
-/**
409
- * pinconf_dbg_config_print() - display the pinctrl config from the pinctrl
410
- * map, of the dev/pin/state that was last written to pinconf-config file.
411
- * @s: string filled in  with config description
412
- * @d: not used
413
- */
414
-static int pinconf_dbg_config_print(struct seq_file *s, void *d)
415
-{
416
-	struct pinctrl_maps *maps_node;
417
-	const struct pinctrl_map *map;
418
-	const struct pinctrl_map *found = NULL;
419
-	struct pinctrl_dev *pctldev;
420
-	struct dbg_cfg *dbg = &pinconf_dbg_conf;
421
-	int i;
422
-
423
-	mutex_lock(&pinctrl_maps_mutex);
424
-
425
-	/* Parse the pinctrl map and look for the elected pin/state */
426
-	for_each_maps(maps_node, i, map) {
427
-		if (map->type != dbg->map_type)
428
-			continue;
429
-		if (strcmp(map->dev_name, dbg->dev_name))
430
-			continue;
431
-		if (strcmp(map->name, dbg->state_name))
432
-			continue;
433
-
434
-		if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
435
-			/* We found the right pin */
436
-			found = map;
437
-			break;
438
-		}
439
-	}
440
-
441
-	if (!found) {
442
-		seq_printf(s, "No config found for dev/state/pin, expected:\n");
443
-		seq_printf(s, "Searched dev:%s\n", dbg->dev_name);
444
-		seq_printf(s, "Searched state:%s\n", dbg->state_name);
445
-		seq_printf(s, "Searched pin:%s\n", dbg->pin_name);
446
-		seq_printf(s, "Use: modify config_pin <devname> "\
447
-				"<state> <pinname> <value>\n");
448
-		goto exit;
449
-	}
450
-
451
-	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
452
-	seq_printf(s, "Dev %s has config of %s in state %s:\n",
453
-		   dbg->dev_name, dbg->pin_name, dbg->state_name);
454
-	pinconf_show_config(s, pctldev, found->data.configs.configs,
455
-			    found->data.configs.num_configs);
456
-
457
-exit:
458
-	mutex_unlock(&pinctrl_maps_mutex);
459
-
460
-	return 0;
461
-}
462
-
463
-/**
464
- * pinconf_dbg_config_write() - modify the pinctrl config in the pinctrl
465
- * map, of a dev/pin/state entry based on user entries to pinconf-config
466
- * @user_buf: contains the modification request with expected format:
467
- *     modify <config> <devicename> <state> <name> <newvalue>
468
- * modify is literal string, alternatives like add/delete not supported yet
469
- * <config> is the configuration to be changed. Supported configs are
470
- *     "config_pin" or "config_group", alternatives like config_mux are not
471
- *     supported yet.
472
- * <devicename> <state> <name> are values that should match the pinctrl-maps
473
- * <newvalue> reflects the new config and is driver dependent
474
- */
475
-static ssize_t pinconf_dbg_config_write(struct file *file,
476
-	const char __user *user_buf, size_t count, loff_t *ppos)
477
-{
478
-	struct pinctrl_maps *maps_node;
479
-	const struct pinctrl_map *map;
480
-	const struct pinctrl_map *found = NULL;
481
-	struct pinctrl_dev *pctldev;
482
-	const struct pinconf_ops *confops = NULL;
483
-	struct dbg_cfg *dbg = &pinconf_dbg_conf;
484
-	const struct pinctrl_map_configs *configs;
485
-	char config[MAX_NAME_LEN + 1];
486
-	char buf[128];
487
-	char *b = &buf[0];
488
-	int buf_size;
489
-	char *token;
490
-	int i;
491
-
492
-	/* Get userspace string and assure termination */
493
-	buf_size = min(count, sizeof(buf) - 1);
494
-	if (copy_from_user(buf, user_buf, buf_size))
495
-		return -EFAULT;
496
-	buf[buf_size] = 0;
497
-
498
-	/*
499
-	 * need to parse entry and extract parameters:
500
-	 * modify configs_pin devicename state pinname newvalue
501
-	 */
502
-
503
-	/* Get arg: 'modify' */
504
-	token = strsep(&b, " ");
505
-	if (!token)
506
-		return -EINVAL;
507
-	if (strcmp(token, "modify"))
508
-		return -EINVAL;
509
-
510
-	/*
511
-	 * Get arg type: "config_pin" and "config_group"
512
-	 *                types are supported so far
513
-	 */
514
-	token = strsep(&b, " ");
515
-	if (!token)
516
-		return -EINVAL;
517
-	if (!strcmp(token, "config_pin"))
518
-		dbg->map_type = PIN_MAP_TYPE_CONFIGS_PIN;
519
-	else if (!strcmp(token, "config_group"))
520
-		dbg->map_type = PIN_MAP_TYPE_CONFIGS_GROUP;
521
-	else
522
-		return -EINVAL;
523
-
524
-	/* get arg 'device_name' */
525
-	token = strsep(&b, " ");
526
-	if (!token)
527
-		return -EINVAL;
528
-	if (strlen(token) >= MAX_NAME_LEN)
529
-		return -EINVAL;
530
-	strncpy(dbg->dev_name, token, MAX_NAME_LEN);
531
-
532
-	/* get arg 'state_name' */
533
-	token = strsep(&b, " ");
534
-	if (!token)
535
-		return -EINVAL;
536
-	if (strlen(token) >= MAX_NAME_LEN)
537
-		return -EINVAL;
538
-	strncpy(dbg->state_name, token, MAX_NAME_LEN);
539
-
540
-	/* get arg 'pin_name' */
541
-	token = strsep(&b, " ");
542
-	if (!token)
543
-		return -EINVAL;
544
-	if (strlen(token) >= MAX_NAME_LEN)
545
-		return -EINVAL;
546
-	strncpy(dbg->pin_name, token, MAX_NAME_LEN);
547
-
548
-	/* get new_value of config' */
549
-	token = strsep(&b, " ");
550
-	if (!token)
551
-		return -EINVAL;
552
-	if (strlen(token) >= MAX_NAME_LEN)
553
-		return -EINVAL;
554
-	strncpy(config, token, MAX_NAME_LEN);
555
-
556
-	mutex_lock(&pinctrl_maps_mutex);
557
-
558
-	/* Parse the pinctrl map and look for the selected dev/state/pin */
559
-	for_each_maps(maps_node, i, map) {
560
-		if (strcmp(map->dev_name, dbg->dev_name))
561
-			continue;
562
-		if (map->type != dbg->map_type)
563
-			continue;
564
-		if (strcmp(map->name, dbg->state_name))
565
-			continue;
566
-
567
-		/*  we found the right pin / state, so overwrite config */
568
-		if (!strcmp(map->data.configs.group_or_pin, dbg->pin_name)) {
569
-			found = map;
570
-			break;
571
-		}
572
-	}
573
-
574
-	if (!found) {
575
-		count = -EINVAL;
576
-		goto exit;
577
-	}
578
-
579
-	pctldev = get_pinctrl_dev_from_devname(found->ctrl_dev_name);
580
-	if (pctldev)
581
-		confops = pctldev->desc->confops;
582
-
583
-	if (confops && confops->pin_config_dbg_parse_modify) {
584
-		configs = &found->data.configs;
585
-		for (i = 0; i < configs->num_configs; i++) {
586
-			confops->pin_config_dbg_parse_modify(pctldev,
587
-						     config,
588
-						     &configs->configs[i]);
589
-		}
590
-	}
591
-
592
-exit:
593
-	mutex_unlock(&pinctrl_maps_mutex);
594
-
595
-	return count;
596
-}
597
-
598
-static int pinconf_dbg_config_open(struct inode *inode, struct file *file)
599
-{
600
-	return single_open(file, pinconf_dbg_config_print, inode->i_private);
601
-}
602
-
603
-static const struct file_operations pinconf_dbg_pinconfig_fops = {
604
-	.open = pinconf_dbg_config_open,
605
-	.write = pinconf_dbg_config_write,
606
-	.read = seq_read,
607
-	.llseek = seq_lseek,
608
-	.release = single_release,
609
-	.owner = THIS_MODULE,
610
-};
367
+DEFINE_SHOW_ATTRIBUTE(pinconf_pins);
368
+DEFINE_SHOW_ATTRIBUTE(pinconf_groups);
611369 
612370 void pinconf_init_device_debugfs(struct dentry *devroot,
613371 			 struct pinctrl_dev *pctldev)
614372 {
615373 	debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO,
616
-			    devroot, pctldev, &pinconf_pins_ops);
374
+			    devroot, pctldev, &pinconf_pins_fops);
617375 	debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO,
618
-			    devroot, pctldev, &pinconf_groups_ops);
619
-	debugfs_create_file("pinconf-config",  (S_IRUGO | S_IWUSR | S_IWGRP),
620
-			    devroot, pctldev, &pinconf_dbg_pinconfig_fops);
376
+			    devroot, pctldev, &pinconf_groups_fops);
621377 }
622378 
623379 #endif