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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/iio/magnetometer/ak8975.c
....@@ -1,26 +1,14 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * A sensor driver for the magnetometer AK8975.
34  *
45  * Magnetic compass sensor driver for monitoring magnetic flux information.
56  *
67  * Copyright (c) 2010, NVIDIA Corporation.
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; either version 2 of the License, or
11
- * (at your option) any later version.
12
- *
13
- * This program is distributed in the hope that it will be useful, but WITHOUT
14
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
16
- * more details.
17
- *
18
- * You should have received a copy of the GNU General Public License along
19
- * with this program; if not, write to the Free Software Foundation, Inc.,
20
- * 51 Franklin Street, Fifth Floor, Boston, MA	02110-1301, USA.
218  */
229 
2310 #include <linux/module.h>
11
+#include <linux/mod_devicetable.h>
2412 #include <linux/kernel.h>
2513 #include <linux/slab.h>
2614 #include <linux/i2c.h>
....@@ -29,9 +17,7 @@
2917 #include <linux/mutex.h>
3018 #include <linux/delay.h>
3119 #include <linux/bitops.h>
32
-#include <linux/gpio.h>
33
-#include <linux/of_gpio.h>
34
-#include <linux/acpi.h>
20
+#include <linux/gpio/consumer.h>
3521 #include <linux/regulator/consumer.h>
3622 #include <linux/pm_runtime.h>
3723 
....@@ -41,8 +27,6 @@
4127 #include <linux/iio/trigger.h>
4228 #include <linux/iio/trigger_consumer.h>
4329 #include <linux/iio/triggered_buffer.h>
44
-
45
-#include <linux/iio/magnetometer/ak8975.h>
4630 
4731 /*
4832  * Register definitions, as well as various shifts and masks to get at the
....@@ -219,11 +203,11 @@
219203 
220204 /* Compatible Asahi Kasei Compass parts */
221205 enum asahi_compass_chipset {
206
+	AKXXXX		= 0,
222207 	AK8975,
223208 	AK8963,
224209 	AK09911,
225210 	AK09912,
226
-	AK_MAX_TYPE
227211 };
228212 
229213 enum ak_ctrl_reg_addr {
....@@ -261,7 +245,7 @@
261245 	u8 data_regs[3];
262246 };
263247 
264
-static const struct ak_def ak_def_array[AK_MAX_TYPE] = {
248
+static const struct ak_def ak_def_array[] = {
265249 	{
266250 		.type = AK8975,
267251 		.raw_to_gauss = ak8975_raw_to_gauss,
....@@ -373,7 +357,8 @@
373357 	struct mutex		lock;
374358 	u8			asa[3];
375359 	long			raw_to_gauss[3];
376
-	int			eoc_gpio;
360
+	struct gpio_desc	*eoc_gpiod;
361
+	struct gpio_desc	*reset_gpiod;
377362 	int			eoc_irq;
378363 	wait_queue_head_t	data_ready_queue;
379364 	unsigned long		flags;
....@@ -404,12 +389,16 @@
404389 	if (ret) {
405390 		dev_warn(&data->client->dev,
406391 			 "Failed to enable specified Vid supply\n");
392
+		regulator_disable(data->vdd);
407393 		return ret;
408394 	}
395
+
396
+	gpiod_set_value_cansleep(data->reset_gpiod, 0);
397
+
409398 	/*
410
-	 * According to the datasheet the power supply rise time i 200us
399
+	 * According to the datasheet the power supply rise time is 200us
411400 	 * and the minimum wait time before mode setting is 100us, in
412
-	 * total 300 us. Add some margin and say minimum 500us here.
401
+	 * total 300us. Add some margin and say minimum 500us here.
413402 	 */
414403 	usleep_range(500, 1000);
415404 	return 0;
....@@ -418,6 +407,8 @@
418407 /* Disable attached power regulator if any. */
419408 static void ak8975_power_off(const struct ak8975_data *data)
420409 {
410
+	gpiod_set_value_cansleep(data->reset_gpiod, 1);
411
+
421412 	regulator_disable(data->vid);
422413 	regulator_disable(data->vdd);
423414 }
....@@ -517,15 +508,13 @@
517508 	if (client->irq)
518509 		irq = client->irq;
519510 	else
520
-		irq = gpio_to_irq(data->eoc_gpio);
511
+		irq = gpiod_to_irq(data->eoc_gpiod);
521512 
522513 	rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler,
523514 			      IRQF_TRIGGER_RISING | IRQF_ONESHOT,
524515 			      dev_name(&client->dev), data);
525516 	if (rc < 0) {
526
-		dev_err(&client->dev,
527
-			"irq %d request failed, (gpio %d): %d\n",
528
-			irq, data->eoc_gpio, rc);
517
+		dev_err(&client->dev, "irq %d request failed: %d\n", irq, rc);
529518 		return rc;
530519 	}
531520 
....@@ -568,7 +557,7 @@
568557 		return ret;
569558 	}
570559 
571
-	if (data->eoc_gpio > 0 || client->irq > 0) {
560
+	if (data->eoc_gpiod || client->irq > 0) {
572561 		ret = ak8975_setup_irq(data);
573562 		if (ret < 0) {
574563 			dev_err(&client->dev,
....@@ -593,7 +582,7 @@
593582 	/* Wait for the conversion to complete. */
594583 	while (timeout_ms) {
595584 		msleep(AK8975_CONVERSION_DONE_POLL_TIME);
596
-		if (gpio_get_value(data->eoc_gpio))
585
+		if (gpiod_get_value(data->eoc_gpiod))
597586 			break;
598587 		timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME;
599588 	}
....@@ -665,7 +654,7 @@
665654 	/* Wait for the conversion to complete. */
666655 	if (data->eoc_irq)
667656 		ret = wait_conversion_complete_interrupt(data);
668
-	else if (gpio_is_valid(data->eoc_gpio))
657
+	else if (data->eoc_gpiod)
669658 		ret = wait_conversion_complete_gpio(data);
670659 	else
671660 		ret = wait_conversion_complete_polled(data);
....@@ -752,12 +741,14 @@
752741 ak8975_get_mount_matrix(const struct iio_dev *indio_dev,
753742 			const struct iio_chan_spec *chan)
754743 {
755
-	return &((struct ak8975_data *)iio_priv(indio_dev))->orientation;
744
+	struct ak8975_data *data = iio_priv(indio_dev);
745
+
746
+	return &data->orientation;
756747 }
757748 
758749 static const struct iio_chan_spec_ext_info ak8975_ext_info[] = {
759750 	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8975_get_mount_matrix),
760
-	{ },
751
+	{ }
761752 };
762753 
763754 #define AK8975_CHANNEL(axis, index)					\
....@@ -789,31 +780,17 @@
789780 	.read_raw = &ak8975_read_raw,
790781 };
791782 
792
-#ifdef CONFIG_ACPI
793783 static const struct acpi_device_id ak_acpi_match[] = {
794784 	{"AK8975", AK8975},
795785 	{"AK8963", AK8963},
796786 	{"INVN6500", AK8963},
797787 	{"AK009911", AK09911},
798788 	{"AK09911", AK09911},
789
+	{"AKM9911", AK09911},
799790 	{"AK09912", AK09912},
800
-	{ },
791
+	{ }
801792 };
802793 MODULE_DEVICE_TABLE(acpi, ak_acpi_match);
803
-#endif
804
-
805
-static const char *ak8975_match_acpi_device(struct device *dev,
806
-					    enum asahi_compass_chipset *chipset)
807
-{
808
-	const struct acpi_device_id *id;
809
-
810
-	id = acpi_match_device(dev->driver->acpi_match_table, dev);
811
-	if (!id)
812
-		return NULL;
813
-	*chipset = (int)id->driver_data;
814
-
815
-	return dev_name(dev);
816
-}
817794 
818795 static void ak8975_fill_buffer(struct iio_dev *indio_dev)
819796 {
....@@ -872,36 +849,34 @@
872849 {
873850 	struct ak8975_data *data;
874851 	struct iio_dev *indio_dev;
875
-	int eoc_gpio;
852
+	struct gpio_desc *eoc_gpiod;
853
+	struct gpio_desc *reset_gpiod;
854
+	const void *match;
855
+	unsigned int i;
876856 	int err;
857
+	enum asahi_compass_chipset chipset;
877858 	const char *name = NULL;
878
-	enum asahi_compass_chipset chipset = AK_MAX_TYPE;
879
-	const struct ak8975_platform_data *pdata =
880
-		dev_get_platdata(&client->dev);
881859 
882
-	/* Grab and set up the supplied GPIO. */
883
-	if (pdata)
884
-		eoc_gpio = pdata->eoc_gpio;
885
-	else if (client->dev.of_node)
886
-		eoc_gpio = of_get_gpio(client->dev.of_node, 0);
887
-	else
888
-		eoc_gpio = -1;
860
+	/*
861
+	 * Grab and set up the supplied GPIO.
862
+	 * We may not have a GPIO based IRQ to scan, that is fine, we will
863
+	 * poll if so.
864
+	 */
865
+	eoc_gpiod = devm_gpiod_get_optional(&client->dev, NULL, GPIOD_IN);
866
+	if (IS_ERR(eoc_gpiod))
867
+		return PTR_ERR(eoc_gpiod);
868
+	if (eoc_gpiod)
869
+		gpiod_set_consumer_name(eoc_gpiod, "ak_8975");
889870 
890
-	if (eoc_gpio == -EPROBE_DEFER)
891
-		return -EPROBE_DEFER;
892
-
893
-	/* We may not have a GPIO based IRQ to scan, that is fine, we will
894
-	   poll if so */
895
-	if (gpio_is_valid(eoc_gpio)) {
896
-		err = devm_gpio_request_one(&client->dev, eoc_gpio,
897
-							GPIOF_IN, "ak_8975");
898
-		if (err < 0) {
899
-			dev_err(&client->dev,
900
-				"failed to request GPIO %d, error %d\n",
901
-							eoc_gpio, err);
902
-			return err;
903
-		}
904
-	}
871
+	/*
872
+	 * According to AK09911 datasheet, if reset GPIO is provided then
873
+	 * deassert reset on ak8975_power_on() and assert reset on
874
+	 * ak8975_power_off().
875
+	 */
876
+	reset_gpiod = devm_gpiod_get_optional(&client->dev,
877
+					      "reset", GPIOD_OUT_HIGH);
878
+	if (IS_ERR(reset_gpiod))
879
+		return PTR_ERR(reset_gpiod);
905880 
906881 	/* Register with IIO */
907882 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
....@@ -912,36 +887,36 @@
912887 	i2c_set_clientdata(client, indio_dev);
913888 
914889 	data->client = client;
915
-	data->eoc_gpio = eoc_gpio;
890
+	data->eoc_gpiod = eoc_gpiod;
891
+	data->reset_gpiod = reset_gpiod;
916892 	data->eoc_irq = 0;
917893 
918
-	if (!pdata) {
919
-		err = of_iio_read_mount_matrix(&client->dev,
920
-					       "mount-matrix",
921
-					       &data->orientation);
922
-		if (err)
923
-			return err;
924
-	} else
925
-		data->orientation = pdata->orientation;
894
+	err = iio_read_mount_matrix(&client->dev, "mount-matrix", &data->orientation);
895
+	if (err)
896
+		return err;
926897 
927898 	/* id will be NULL when enumerated via ACPI */
928
-	if (id) {
899
+	match = device_get_match_data(&client->dev);
900
+	if (match) {
901
+		chipset = (enum asahi_compass_chipset)(match);
902
+		name = dev_name(&client->dev);
903
+	} else if (id) {
929904 		chipset = (enum asahi_compass_chipset)(id->driver_data);
930905 		name = id->name;
931
-	} else if (ACPI_HANDLE(&client->dev)) {
932
-		name = ak8975_match_acpi_device(&client->dev, &chipset);
933
-		if (!name)
934
-			return -ENODEV;
935906 	} else
936907 		return -ENOSYS;
937908 
938
-	if (chipset >= AK_MAX_TYPE) {
909
+	for (i = 0; i < ARRAY_SIZE(ak_def_array); i++)
910
+		if (ak_def_array[i].type == chipset)
911
+			break;
912
+
913
+	if (i == ARRAY_SIZE(ak_def_array)) {
939914 		dev_err(&client->dev, "AKM device type unsupported: %d\n",
940915 			chipset);
941916 		return -ENODEV;
942917 	}
943918 
944
-	data->def = &ak_def_array[chipset];
919
+	data->def = &ak_def_array[i];
945920 
946921 	/* Fetch the regulators */
947922 	data->vdd = devm_regulator_get(&client->dev, "vdd");
....@@ -970,7 +945,6 @@
970945 	}
971946 
972947 	mutex_init(&data->lock);
973
-	indio_dev->dev.parent = &client->dev;
974948 	indio_dev->channels = ak8975_channels;
975949 	indio_dev->num_channels = ARRAY_SIZE(ak8975_channels);
976950 	indio_dev->info = &ak8975_info;
....@@ -1106,8 +1080,8 @@
11061080 	.driver = {
11071081 		.name	= "ak8975",
11081082 		.pm = &ak8975_dev_pm_ops,
1109
-		.of_match_table = of_match_ptr(ak8975_of_match),
1110
-		.acpi_match_table = ACPI_PTR(ak_acpi_match),
1083
+		.of_match_table = ak8975_of_match,
1084
+		.acpi_match_table = ak_acpi_match,
11111085 	},
11121086 	.probe		= ak8975_probe,
11131087 	.remove		= ak8975_remove,