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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/iio/adc/max1027.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
  /*
2
3
   * iio/adc/max1027.c
3
4
   * Copyright (C) 2014 Philippe Reynes
..
..
@@ -6,10 +7,6 @@
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7
   * Copyright 2011 Analog Devices Inc (from AD7923 Driver)
7
8
   * Copyright 2012 CS Systemes d'Information
8
9
   *
9
-  * This program is free software; you can redistribute it and/or modify
10
-  * it under the terms of the GNU General Public License version 2 as
11
-  * published by the Free Software Foundation.
12
-  *
13
10
   * max1027.c
14
11
   *
15
12
   * Partial support for max1027 and similar chips.
..
..
@@ -17,6 +14,7 @@
17
14
 
18
15
 #include <linux/kernel.h>
19
16
 #include <linux/module.h>
17
+#include <linux/mod_devicetable.h>
20
18
 #include <linux/spi/spi.h>
21
19
 #include <linux/delay.h>
22
20
 
..
..
@@ -66,27 +64,34 @@
66
64
 	max1027,
67
65
 	max1029,
68
66
 	max1031,
67
+	max1227,
68
+	max1229,
69
+	max1231,
69
70
 };
70
71
 
71
72
 static const struct spi_device_id max1027_id[] = {
72
73
 	{"max1027", max1027},
73
74
 	{"max1029", max1029},
74
75
 	{"max1031", max1031},
76
+	{"max1227", max1227},
77
+	{"max1229", max1229},
78
+	{"max1231", max1231},
75
79
 	{}
76
80
 };
77
81
 MODULE_DEVICE_TABLE(spi, max1027_id);
78
82
 
79
-#ifdef CONFIG_OF
80
83
 static const struct of_device_id max1027_adc_dt_ids[] = {
81
84
 	{ .compatible = "maxim,max1027" },
82
85
 	{ .compatible = "maxim,max1029" },
83
86
 	{ .compatible = "maxim,max1031" },
87
+	{ .compatible = "maxim,max1227" },
88
+	{ .compatible = "maxim,max1229" },
89
+	{ .compatible = "maxim,max1231" },
84
90
 	{},
85
91
 };
86
92
 MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
87
-#endif
88
93
 
89
-#define MAX1027_V_CHAN(index)						\
94
+#define MAX1027_V_CHAN(index, depth)					\
90
95
 	{								\
91
96
 		.type = IIO_VOLTAGE,					\
92
97
 		.indexed = 1,						\
..
..
@@ -96,9 +101,9 @@
96
101
 		.scan_index = index + 1,				\
97
102
 		.scan_type = {						\
98
103
 			.sign = 'u',					\
99
-			.realbits = 10,					\
104
+			.realbits = depth,				\
100
105
 			.storagebits = 16,				\
101
-			.shift = 2,					\
106
+			.shift = (depth == 10) ? 2 : 0,			\
102
107
 			.endianness = IIO_BE,				\
103
108
 		},							\
104
109
 	}
..
..
@@ -118,52 +123,53 @@
118
123
 		},							\
119
124
 	}
120
125
 
126
+#define MAX1X27_CHANNELS(depth)			\
127
+	MAX1027_T_CHAN,				\
128
+	MAX1027_V_CHAN(0, depth),		\
129
+	MAX1027_V_CHAN(1, depth),		\
130
+	MAX1027_V_CHAN(2, depth),		\
131
+	MAX1027_V_CHAN(3, depth),		\
132
+	MAX1027_V_CHAN(4, depth),		\
133
+	MAX1027_V_CHAN(5, depth),		\
134
+	MAX1027_V_CHAN(6, depth),		\
135
+	MAX1027_V_CHAN(7, depth)
136
+
137
+#define MAX1X29_CHANNELS(depth)			\
138
+	MAX1X27_CHANNELS(depth),		\
139
+	MAX1027_V_CHAN(8, depth),		\
140
+	MAX1027_V_CHAN(9, depth),		\
141
+	MAX1027_V_CHAN(10, depth),		\
142
+	MAX1027_V_CHAN(11, depth)
143
+
144
+#define MAX1X31_CHANNELS(depth)			\
145
+	MAX1X29_CHANNELS(depth),		\
146
+	MAX1027_V_CHAN(12, depth),		\
147
+	MAX1027_V_CHAN(13, depth),		\
148
+	MAX1027_V_CHAN(14, depth),		\
149
+	MAX1027_V_CHAN(15, depth)
150
+
121
151
 static const struct iio_chan_spec max1027_channels[] = {
122
-	MAX1027_T_CHAN,
123
-	MAX1027_V_CHAN(0),
124
-	MAX1027_V_CHAN(1),
125
-	MAX1027_V_CHAN(2),
126
-	MAX1027_V_CHAN(3),
127
-	MAX1027_V_CHAN(4),
128
-	MAX1027_V_CHAN(5),
129
-	MAX1027_V_CHAN(6),
130
-	MAX1027_V_CHAN(7)
152
+	MAX1X27_CHANNELS(10),
131
153
 };
132
154
 
133
155
 static const struct iio_chan_spec max1029_channels[] = {
134
-	MAX1027_T_CHAN,
135
-	MAX1027_V_CHAN(0),
136
-	MAX1027_V_CHAN(1),
137
-	MAX1027_V_CHAN(2),
138
-	MAX1027_V_CHAN(3),
139
-	MAX1027_V_CHAN(4),
140
-	MAX1027_V_CHAN(5),
141
-	MAX1027_V_CHAN(6),
142
-	MAX1027_V_CHAN(7),
143
-	MAX1027_V_CHAN(8),
144
-	MAX1027_V_CHAN(9),
145
-	MAX1027_V_CHAN(10),
146
-	MAX1027_V_CHAN(11)
156
+	MAX1X29_CHANNELS(10),
147
157
 };
148
158
 
149
159
 static const struct iio_chan_spec max1031_channels[] = {
150
-	MAX1027_T_CHAN,
151
-	MAX1027_V_CHAN(0),
152
-	MAX1027_V_CHAN(1),
153
-	MAX1027_V_CHAN(2),
154
-	MAX1027_V_CHAN(3),
155
-	MAX1027_V_CHAN(4),
156
-	MAX1027_V_CHAN(5),
157
-	MAX1027_V_CHAN(6),
158
-	MAX1027_V_CHAN(7),
159
-	MAX1027_V_CHAN(8),
160
-	MAX1027_V_CHAN(9),
161
-	MAX1027_V_CHAN(10),
162
-	MAX1027_V_CHAN(11),
163
-	MAX1027_V_CHAN(12),
164
-	MAX1027_V_CHAN(13),
165
-	MAX1027_V_CHAN(14),
166
-	MAX1027_V_CHAN(15)
160
+	MAX1X31_CHANNELS(10),
161
+};
162
+
163
+static const struct iio_chan_spec max1227_channels[] = {
164
+	MAX1X27_CHANNELS(12),
165
+};
166
+
167
+static const struct iio_chan_spec max1229_channels[] = {
168
+	MAX1X29_CHANNELS(12),
169
+};
170
+
171
+static const struct iio_chan_spec max1231_channels[] = {
172
+	MAX1X31_CHANNELS(12),
167
173
 };
168
174
 
169
175
 static const unsigned long max1027_available_scan_masks[] = {
..
..
@@ -201,6 +207,21 @@
201
207
 	[max1031] = {
202
208
 		.channels = max1031_channels,
203
209
 		.num_channels = ARRAY_SIZE(max1031_channels),
210
+		.available_scan_masks = max1031_available_scan_masks,
211
+	},
212
+	[max1227] = {
213
+		.channels = max1227_channels,
214
+		.num_channels = ARRAY_SIZE(max1227_channels),
215
+		.available_scan_masks = max1027_available_scan_masks,
216
+	},
217
+	[max1229] = {
218
+		.channels = max1229_channels,
219
+		.num_channels = ARRAY_SIZE(max1229_channels),
220
+		.available_scan_masks = max1029_available_scan_masks,
221
+	},
222
+	[max1231] = {
223
+		.channels = max1231_channels,
224
+		.num_channels = ARRAY_SIZE(max1231_channels),
204
225
 		.available_scan_masks = max1031_available_scan_masks,
205
226
 	},
206
227
 };
..
..
@@ -287,7 +308,7 @@
287
308
 			break;
288
309
 		case IIO_VOLTAGE:
289
310
 			*val = 2500;
290
-			*val2 = 10;
311
+			*val2 = chan->scan_type.realbits;
291
312
 			ret = IIO_VAL_FRACTIONAL_LOG2;
292
313
 			break;
293
314
 		default:
..
..
@@ -312,8 +333,11 @@
312
333
 	struct max1027_state *st = iio_priv(indio_dev);
313
334
 	u8 *val = (u8 *)st->buffer;
314
335
 
315
-	if (readval != NULL)
316
-		return -EINVAL;
336
+	if (readval) {
337
+		int ret = spi_read(st->spi, val, 2);
338
+		*readval = be16_to_cpu(st->buffer[0]);
339
+		return ret;
340
+	}
317
341
 
318
342
 	*val = (u8)writeval;
319
343
 	return spi_write(st->spi, val, 1);
..
..
@@ -414,8 +438,6 @@
414
438
 	mutex_init(&st->lock);
415
439
 
416
440
 	indio_dev->name = spi_get_device_id(spi)->name;
417
-	indio_dev->dev.parent = &spi->dev;
418
-	indio_dev->dev.of_node = spi->dev.of_node;
419
441
 	indio_dev->info = &max1027_info;
420
442
 	indio_dev->modes = INDIO_DIRECT_MODE;
421
443
 	indio_dev->channels = st->info->channels;
..
..
@@ -430,34 +452,46 @@
430
452
 		return -ENOMEM;
431
453
 	}
432
454
 
433
-	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
434
-					 &max1027_trigger_handler, NULL);
435
-	if (ret < 0) {
436
-		dev_err(&indio_dev->dev, "Failed to setup buffer\n");
437
-		return ret;
438
-	}
455
+	if (spi->irq) {
456
+		ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
457
+						      &iio_pollfunc_store_time,
458
+						      &max1027_trigger_handler,
459
+						      NULL);
460
+		if (ret < 0) {
461
+			dev_err(&indio_dev->dev, "Failed to setup buffer\n");
462
+			return ret;
463
+		}
439
464
 
440
-	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
441
-							indio_dev->name);
442
-	if (st->trig == NULL) {
443
-		ret = -ENOMEM;
444
-		dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
445
-		goto fail_trigger_alloc;
446
-	}
465
+		st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
466
+						  indio_dev->name);
467
+		if (st->trig == NULL) {
468
+			ret = -ENOMEM;
469
+			dev_err(&indio_dev->dev,
470
+				"Failed to allocate iio trigger\n");
471
+			return ret;
472
+		}
447
473
 
448
-	st->trig->ops = &max1027_trigger_ops;
449
-	st->trig->dev.parent = &spi->dev;
450
-	iio_trigger_set_drvdata(st->trig, indio_dev);
451
-	iio_trigger_register(st->trig);
474
+		st->trig->ops = &max1027_trigger_ops;
475
+		st->trig->dev.parent = &spi->dev;
476
+		iio_trigger_set_drvdata(st->trig, indio_dev);
477
+		ret = devm_iio_trigger_register(&indio_dev->dev,
478
+						st->trig);
479
+		if (ret < 0) {
480
+			dev_err(&indio_dev->dev,
481
+				"Failed to register iio trigger\n");
482
+			return ret;
483
+		}
452
484
 
453
-	ret = devm_request_threaded_irq(&spi->dev, spi->irq,
454
-					iio_trigger_generic_data_rdy_poll,
455
-					NULL,
456
-					IRQF_TRIGGER_FALLING,
457
-					spi->dev.driver->name, st->trig);
458
-	if (ret < 0) {
459
-		dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
460
-		goto fail_dev_register;
485
+		ret = devm_request_threaded_irq(&spi->dev, spi->irq,
486
+						iio_trigger_generic_data_rdy_poll,
487
+						NULL,
488
+						IRQF_TRIGGER_FALLING,
489
+						spi->dev.driver->name,
490
+						st->trig);
491
+		if (ret < 0) {
492
+			dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
493
+			return ret;
494
+		}
461
495
 	}
462
496
 
463
497
 	/* Internal reset */
..
..
@@ -473,47 +507,22 @@
473
507
 	ret = spi_write(st->spi, &st->reg, 1);
474
508
 	if (ret < 0) {
475
509
 		dev_err(&indio_dev->dev, "Failed to configure averaging register\n");
476
-		goto fail_dev_register;
510
+		return ret;
477
511
 	}
478
512
 
479
-	ret = iio_device_register(indio_dev);
480
-	if (ret < 0) {
481
-		dev_err(&indio_dev->dev, "Failed to register iio device\n");
482
-		goto fail_dev_register;
483
-	}
484
-
485
-	return 0;
486
-
487
-fail_dev_register:
488
-fail_trigger_alloc:
489
-	iio_triggered_buffer_cleanup(indio_dev);
490
-
491
-	return ret;
492
-}
493
-
494
-static int max1027_remove(struct spi_device *spi)
495
-{
496
-	struct iio_dev *indio_dev = spi_get_drvdata(spi);
497
-
498
-	pr_debug("%s: remove(spi = 0x%p)\n", __func__, spi);
499
-
500
-	iio_device_unregister(indio_dev);
501
-	iio_triggered_buffer_cleanup(indio_dev);
502
-
503
-	return 0;
513
+	return devm_iio_device_register(&spi->dev, indio_dev);
504
514
 }
505
515
 
506
516
 static struct spi_driver max1027_driver = {
507
517
 	.driver = {
508
518
 		.name	= "max1027",
509
-		.of_match_table = of_match_ptr(max1027_adc_dt_ids),
519
+		.of_match_table = max1027_adc_dt_ids,
510
520
 	},
511
521
 	.probe		= max1027_probe,
512
-	.remove		= max1027_remove,
513
522
 	.id_table	= max1027_id,
514
523
 };
515
524
 module_spi_driver(max1027_driver);
516
525
 
517
526
 MODULE_AUTHOR("Philippe Reynes <tremyfr@yahoo.fr>");
518
-MODULE_DESCRIPTION("MAX1027/MAX1029/MAX1031 ADC");
527
+MODULE_DESCRIPTION("MAX1X27/MAX1X29/MAX1X31 ADC");
519
528
 MODULE_LICENSE("GPL v2");