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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/staging/iio/resolver/ad2s1210.c
..
..
@@ -1,12 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0
1
2
 /*
2
3
  * ad2s1210.c support for the ADI Resolver to Digital Converters: AD2S1210
3
4
  *
4
5
  * Copyright (c) 2010-2010 Analog Devices Inc.
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License version 2 as
8
- * published by the Free Software Foundation.
9
- *
10
6
  */
11
7
 #include <linux/types.h>
12
8
 #include <linux/mutex.h>
..
..
@@ -15,12 +11,11 @@
15
11
 #include <linux/slab.h>
16
12
 #include <linux/sysfs.h>
17
13
 #include <linux/delay.h>
18
-#include <linux/gpio.h>
14
+#include <linux/gpio/consumer.h>
19
15
 #include <linux/module.h>
20
16
 
21
17
 #include <linux/iio/iio.h>
22
18
 #include <linux/iio/sysfs.h>
23
-#include "ad2s1210.h"
24
19
 
25
20
 #define DRV_NAME "ad2s1210"
26
21
 
..
..
@@ -67,12 +62,33 @@
67
62
 	MOD_RESERVED,
68
63
 };
69
64
 
65
+enum ad2s1210_gpios {
66
+	AD2S1210_SAMPLE,
67
+	AD2S1210_A0,
68
+	AD2S1210_A1,
69
+	AD2S1210_RES0,
70
+	AD2S1210_RES1,
71
+};
72
+
73
+struct ad2s1210_gpio {
74
+	const char *name;
75
+	unsigned long flags;
76
+};
77
+
78
+static const struct ad2s1210_gpio gpios[] = {
79
+	[AD2S1210_SAMPLE] = { .name = "adi,sample", .flags = GPIOD_OUT_LOW },
80
+	[AD2S1210_A0] = { .name = "adi,a0", .flags = GPIOD_OUT_LOW },
81
+	[AD2S1210_A1] = { .name = "adi,a1", .flags = GPIOD_OUT_LOW },
82
+	[AD2S1210_RES0] = { .name = "adi,res0", .flags = GPIOD_OUT_LOW },
83
+	[AD2S1210_RES1] = { .name = "adi,res1", .flags = GPIOD_OUT_LOW },
84
+};
85
+
70
86
 static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
71
87
 
72
88
 struct ad2s1210_state {
73
-	const struct ad2s1210_platform_data *pdata;
74
89
 	struct mutex lock;
75
90
 	struct spi_device *sdev;
91
+	struct gpio_desc *gpios[5];
76
92
 	unsigned int fclkin;
77
93
 	unsigned int fexcit;
78
94
 	bool hysteresis;
..
..
@@ -85,14 +101,14 @@
85
101
 static const int ad2s1210_mode_vals[4][2] = {
86
102
 	[MOD_POS] = { 0, 0 },
87
103
 	[MOD_VEL] = { 0, 1 },
88
-	[MOD_CONFIG] = { 1, 0 },
104
+	[MOD_CONFIG] = { 1, 1 },
89
105
 };
90
106
 
91
107
 static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,
92
108
 				     struct ad2s1210_state *st)
93
109
 {
94
-	gpio_set_value(st->pdata->a[0], ad2s1210_mode_vals[mode][0]);
95
-	gpio_set_value(st->pdata->a[1], ad2s1210_mode_vals[mode][1]);
110
+	gpiod_set_value(st->gpios[AD2S1210_A0], ad2s1210_mode_vals[mode][0]);
111
+	gpiod_set_value(st->gpios[AD2S1210_A1], ad2s1210_mode_vals[mode][1]);
96
112
 	st->mode = mode;
97
113
 }
98
114
 
..
..
@@ -157,24 +173,16 @@
157
173
 	return ad2s1210_config_write(st, fcw);
158
174
 }
159
175
 
160
-static unsigned char ad2s1210_read_resolution_pin(struct ad2s1210_state *st)
161
-{
162
-	int resolution = (gpio_get_value(st->pdata->res[0]) << 1) |
163
-			  gpio_get_value(st->pdata->res[1]);
164
-
165
-	return ad2s1210_resolution_value[resolution];
166
-}
167
-
168
176
 static const int ad2s1210_res_pins[4][2] = {
169
177
 	{ 0, 0 }, {0, 1}, {1, 0}, {1, 1}
170
178
 };
171
179
 
172
180
 static inline void ad2s1210_set_resolution_pin(struct ad2s1210_state *st)
173
181
 {
174
-	gpio_set_value(st->pdata->res[0],
175
-		       ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
176
-	gpio_set_value(st->pdata->res[1],
177
-		       ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
182
+	gpiod_set_value(st->gpios[AD2S1210_RES0],
183
+			ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
184
+	gpiod_set_value(st->gpios[AD2S1210_RES1],
185
+			ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
178
186
 }
179
187
 
180
188
 static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
..
..
@@ -308,15 +316,9 @@
308
316
 			"ad2s1210: write control register fail\n");
309
317
 		goto error_ret;
310
318
 	}
311
-	st->resolution
312
-		= ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
313
-	if (st->pdata->gpioin) {
314
-		data = ad2s1210_read_resolution_pin(st);
315
-		if (data != st->resolution)
316
-			dev_warn(dev, "ad2s1210: resolution settings not match\n");
317
-	} else {
318
-		ad2s1210_set_resolution_pin(st);
319
-	}
319
+	st->resolution =
320
+		ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
321
+	ad2s1210_set_resolution_pin(st);
320
322
 	ret = len;
321
323
 	st->hysteresis = !!(data & AD2S1210_ENABLE_HYSTERESIS);
322
324
 
..
..
@@ -370,15 +372,9 @@
370
372
 		dev_err(dev, "ad2s1210: setting resolution fail\n");
371
373
 		goto error_ret;
372
374
 	}
373
-	st->resolution
374
-		= ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
375
-	if (st->pdata->gpioin) {
376
-		data = ad2s1210_read_resolution_pin(st);
377
-		if (data != st->resolution)
378
-			dev_warn(dev, "ad2s1210: resolution settings not match\n");
379
-	} else {
380
-		ad2s1210_set_resolution_pin(st);
381
-	}
375
+	st->resolution =
376
+		ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
377
+	ad2s1210_set_resolution_pin(st);
382
378
 	ret = len;
383
379
 error_ret:
384
380
 	mutex_unlock(&st->lock);
..
..
@@ -408,15 +404,15 @@
408
404
 	int ret;
409
405
 
410
406
 	mutex_lock(&st->lock);
411
-	gpio_set_value(st->pdata->sample, 0);
407
+	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
412
408
 	/* delay (2 * tck + 20) nano seconds */
413
409
 	udelay(1);
414
-	gpio_set_value(st->pdata->sample, 1);
410
+	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
415
411
 	ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
416
412
 	if (ret < 0)
417
413
 		goto error_ret;
418
-	gpio_set_value(st->pdata->sample, 0);
419
-	gpio_set_value(st->pdata->sample, 1);
414
+	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
415
+	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
420
416
 error_ret:
421
417
 	mutex_unlock(&st->lock);
422
418
 
..
..
@@ -473,7 +469,7 @@
473
469
 	s16 vel;
474
470
 
475
471
 	mutex_lock(&st->lock);
476
-	gpio_set_value(st->pdata->sample, 0);
472
+	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
477
473
 	/* delay (6 * tck + 20) nano seconds */
478
474
 	udelay(1);
479
475
 
..
..
@@ -519,7 +515,7 @@
519
515
 	}
520
516
 
521
517
 error_ret:
522
-	gpio_set_value(st->pdata->sample, 1);
518
+	gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
523
519
 	/* delay (2 * tck + 20) nano seconds */
524
520
 	udelay(1);
525
521
 	mutex_unlock(&st->lock);
..
..
@@ -599,10 +595,7 @@
599
595
 	int ret;
600
596
 
601
597
 	mutex_lock(&st->lock);
602
-	if (st->pdata->gpioin)
603
-		st->resolution = ad2s1210_read_resolution_pin(st);
604
-	else
605
-		ad2s1210_set_resolution_pin(st);
598
+	ad2s1210_set_resolution_pin(st);
606
599
 
607
600
 	ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
608
601
 	if (ret < 0)
..
..
@@ -637,30 +630,22 @@
637
630
 
638
631
 static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
639
632
 {
640
-	unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
641
-	struct gpio ad2s1210_gpios[] = {
642
-		{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
643
-		{ st->pdata->a[0], flags, "a0" },
644
-		{ st->pdata->a[1], flags, "a1" },
645
-		{ st->pdata->res[0], flags, "res0" },
646
-		{ st->pdata->res[0], flags, "res1" },
647
-	};
633
+	struct spi_device *spi = st->sdev;
634
+	int i, ret;
648
635
 
649
-	return gpio_request_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
650
-}
636
+	for (i = 0; i < ARRAY_SIZE(gpios); i++) {
637
+		st->gpios[i] = devm_gpiod_get(&spi->dev, gpios[i].name,
638
+					      gpios[i].flags);
639
+		if (IS_ERR(st->gpios[i])) {
640
+			ret = PTR_ERR(st->gpios[i]);
641
+			dev_err(&spi->dev,
642
+				"ad2s1210: failed to request %s GPIO: %d\n",
643
+				gpios[i].name, ret);
644
+			return ret;
645
+		}
646
+	}
651
647
 
652
-static void ad2s1210_free_gpios(struct ad2s1210_state *st)
653
-{
654
-	unsigned long flags = st->pdata->gpioin ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
655
-	struct gpio ad2s1210_gpios[] = {
656
-		{ st->pdata->sample, GPIOF_DIR_IN, "sample" },
657
-		{ st->pdata->a[0], flags, "a0" },
658
-		{ st->pdata->a[1], flags, "a1" },
659
-		{ st->pdata->res[0], flags, "res0" },
660
-		{ st->pdata->res[0], flags, "res1" },
661
-	};
662
-
663
-	gpio_free_array(ad2s1210_gpios, ARRAY_SIZE(ad2s1210_gpios));
648
+	return 0;
664
649
 }
665
650
 
666
651
 static int ad2s1210_probe(struct spi_device *spi)
..
..
@@ -669,14 +654,10 @@
669
654
 	struct ad2s1210_state *st;
670
655
 	int ret;
671
656
 
672
-	if (!spi->dev.platform_data)
673
-		return -EINVAL;
674
-
675
657
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
676
658
 	if (!indio_dev)
677
659
 		return -ENOMEM;
678
660
 	st = iio_priv(indio_dev);
679
-	st->pdata = spi->dev.platform_data;
680
661
 	ret = ad2s1210_setup_gpios(st);
681
662
 	if (ret < 0)
682
663
 		return ret;
..
..
@@ -690,16 +671,15 @@
690
671
 	st->resolution = 12;
691
672
 	st->fexcit = AD2S1210_DEF_EXCIT;
692
673
 
693
-	indio_dev->dev.parent = &spi->dev;
694
674
 	indio_dev->info = &ad2s1210_info;
695
675
 	indio_dev->modes = INDIO_DIRECT_MODE;
696
676
 	indio_dev->channels = ad2s1210_channels;
697
677
 	indio_dev->num_channels = ARRAY_SIZE(ad2s1210_channels);
698
678
 	indio_dev->name = spi_get_device_id(spi)->name;
699
679
 
700
-	ret = iio_device_register(indio_dev);
680
+	ret = devm_iio_device_register(&spi->dev, indio_dev);
701
681
 	if (ret)
702
-		goto error_free_gpios;
682
+		return ret;
703
683
 
704
684
 	st->fclkin = spi->max_speed_hz;
705
685
 	spi->mode = SPI_MODE_3;
..
..
@@ -707,21 +687,13 @@
707
687
 	ad2s1210_initial(st);
708
688
 
709
689
 	return 0;
710
-
711
-error_free_gpios:
712
-	ad2s1210_free_gpios(st);
713
-	return ret;
714
690
 }
715
691
 
716
-static int ad2s1210_remove(struct spi_device *spi)
717
-{
718
-	struct iio_dev *indio_dev = spi_get_drvdata(spi);
719
-
720
-	iio_device_unregister(indio_dev);
721
-	ad2s1210_free_gpios(iio_priv(indio_dev));
722
-
723
-	return 0;
724
-}
692
+static const struct of_device_id ad2s1210_of_match[] = {
693
+	{ .compatible = "adi,ad2s1210", },
694
+	{ }
695
+};
696
+MODULE_DEVICE_TABLE(of, ad2s1210_of_match);
725
697
 
726
698
 static const struct spi_device_id ad2s1210_id[] = {
727
699
 	{ "ad2s1210" },
..
..
@@ -732,9 +704,9 @@
732
704
 static struct spi_driver ad2s1210_driver = {
733
705
 	.driver = {
734
706
 		.name = DRV_NAME,
707
+		.of_match_table = of_match_ptr(ad2s1210_of_match),
735
708
 	},
736
709
 	.probe = ad2s1210_probe,
737
-	.remove = ad2s1210_remove,
738
710
 	.id_table = ad2s1210_id,
739
711
 };
740
712
 module_spi_driver(ad2s1210_driver);