inv_mpu_i2c.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3* Copyright (C) 2012 Invensense, Inc.
  4*/
  5
  6#include <linux/delay.h>
  7#include <linux/err.h>
  8#include <linux/i2c.h>
  9#include <linux/iio/iio.h>
 10#include <linux/mod_devicetable.h>
 11#include <linux/module.h>
 12#include <linux/property.h>
 13
 14#include "inv_mpu_iio.h"
 15
 16static const struct regmap_config inv_mpu_regmap_config = {
 17	.reg_bits = 8,
 18	.val_bits = 8,
 19};
 20
 21static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
 22{
 23	return 0;
 24}
 25
 26static bool inv_mpu_i2c_aux_bus(struct device *dev)
 27{
 28	struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev));
 29
 30	switch (st->chip_type) {
 31	case INV_ICM20608:
 32	case INV_ICM20608D:
 33	case INV_ICM20609:
 34	case INV_ICM20689:
 35	case INV_ICM20600:
 36	case INV_ICM20602:
 37	case INV_IAM20380:
 38	case INV_IAM20680:
 39		/* no i2c auxiliary bus on the chip */
 40		return false;
 41	case INV_MPU9150:
 42	case INV_MPU9250:
 43	case INV_MPU9255:
 44		if (st->magn_disabled)
 45			return true;
 46		else
 47			return false;
 48	default:
 49		return true;
 50	}
 51}
 52
 53static int inv_mpu_i2c_aux_setup(struct iio_dev *indio_dev)
 54{
 55	struct inv_mpu6050_state *st = iio_priv(indio_dev);
 56	struct device *dev = indio_dev->dev.parent;
 57	struct fwnode_handle *mux_node;
 58	int ret;
 59
 60	/*
 61	 * MPU9xxx magnetometer support requires to disable i2c auxiliary bus.
 62	 * To ensure backward compatibility with existing setups, do not disable
 63	 * i2c auxiliary bus if it used.
 64	 * Check for i2c-gate node in devicetree and set magnetometer disabled.
 65	 * Only MPU6500 is supported by ACPI, no need to check.
 66	 */
 67	switch (st->chip_type) {
 68	case INV_MPU9150:
 69	case INV_MPU9250:
 70	case INV_MPU9255:
 71		mux_node = device_get_named_child_node(dev, "i2c-gate");
 72		if (mux_node != NULL) {
 73			st->magn_disabled = true;
 74			dev_warn(dev, "disable internal use of magnetometer\n");
 75		}
 76		fwnode_handle_put(mux_node);
 77		break;
 78	default:
 79		break;
 80	}
 81
 82	/* enable i2c bypass when using i2c auxiliary bus */
 83	if (inv_mpu_i2c_aux_bus(dev)) {
 84		ret = regmap_write(st->map, st->reg->int_pin_cfg,
 85				   st->irq_mask | INV_MPU6050_BIT_BYPASS_EN);
 86		if (ret)
 87			return ret;
 88	}
 89
 90	return 0;
 91}
 92
 93/**
 94 *  inv_mpu_probe() - probe function.
 95 *  @client:          i2c client.
 96 *
 97 *  Returns 0 on success, a negative error code otherwise.
 98 */
 99static int inv_mpu_probe(struct i2c_client *client)
100{
101	const struct i2c_device_id *id = i2c_client_get_device_id(client);
102	const void *match;
103	struct inv_mpu6050_state *st;
104	int result;
105	enum inv_devices chip_type;
106	struct regmap *regmap;
107	const char *name;
108
109	if (!i2c_check_functionality(client->adapter,
110				     I2C_FUNC_SMBUS_I2C_BLOCK))
111		return -EOPNOTSUPP;
112
113	match = device_get_match_data(&client->dev);
114	if (match) {
115		chip_type = (uintptr_t)match;
116		name = client->name;
117	} else if (id) {
118		chip_type = (enum inv_devices)
119			id->driver_data;
120		name = id->name;
121	} else {
122		return -ENOSYS;
123	}
124
125	regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
126	if (IS_ERR(regmap)) {
127		dev_err(&client->dev, "Failed to register i2c regmap: %pe\n",
128			regmap);
129		return PTR_ERR(regmap);
130	}
131
132	result = inv_mpu_core_probe(regmap, client->irq, name,
133				    inv_mpu_i2c_aux_setup, chip_type);
134	if (result < 0)
135		return result;
136
137	st = iio_priv(dev_get_drvdata(&client->dev));
138	if (inv_mpu_i2c_aux_bus(&client->dev)) {
139		/* declare i2c auxiliary bus */
140		st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
141					 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
142					 inv_mpu6050_select_bypass, NULL);
143		if (!st->muxc)
144			return -ENOMEM;
145		st->muxc->priv = dev_get_drvdata(&client->dev);
146		result = i2c_mux_add_adapter(st->muxc, 0, 0);
147		if (result)
148			return result;
149		result = inv_mpu_acpi_create_mux_client(client);
150		if (result)
151			goto out_del_mux;
152	}
153
154	return 0;
155
156out_del_mux:
157	i2c_mux_del_adapters(st->muxc);
158	return result;
159}
160
161static void inv_mpu_remove(struct i2c_client *client)
162{
163	struct iio_dev *indio_dev = i2c_get_clientdata(client);
164	struct inv_mpu6050_state *st = iio_priv(indio_dev);
165
166	if (st->muxc) {
167		inv_mpu_acpi_delete_mux_client(client);
168		i2c_mux_del_adapters(st->muxc);
169	}
170}
171
172/*
173 * device id table is used to identify what device can be
174 * supported by this driver
175 */
176static const struct i2c_device_id inv_mpu_id[] = {
177	{"mpu6050", INV_MPU6050},
178	{"mpu6500", INV_MPU6500},
179	{"mpu6515", INV_MPU6515},
180	{"mpu6880", INV_MPU6880},
181	{"mpu9150", INV_MPU9150},
182	{"mpu9250", INV_MPU9250},
183	{"mpu9255", INV_MPU9255},
184	{"icm20608", INV_ICM20608},
185	{"icm20608d", INV_ICM20608D},
186	{"icm20609", INV_ICM20609},
187	{"icm20689", INV_ICM20689},
188	{"icm20600", INV_ICM20600},
189	{"icm20602", INV_ICM20602},
190	{"icm20690", INV_ICM20690},
191	{"iam20380", INV_IAM20380},
192	{"iam20680", INV_IAM20680},
193	{"iam20680hp", INV_IAM20680HP},
194	{"iam20680ht", INV_IAM20680HT},
195	{ }
196};
197
198MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
199
200static const struct of_device_id inv_of_match[] = {
201	{
202		.compatible = "invensense,mpu6050",
203		.data = (void *)INV_MPU6050
204	},
205	{
206		.compatible = "invensense,mpu6500",
207		.data = (void *)INV_MPU6500
208	},
209	{
210		.compatible = "invensense,mpu6515",
211		.data = (void *)INV_MPU6515
212	},
213	{
214		.compatible = "invensense,mpu6880",
215		.data = (void *)INV_MPU6880
216	},
217	{
218		.compatible = "invensense,mpu9150",
219		.data = (void *)INV_MPU9150
220	},
221	{
222		.compatible = "invensense,mpu9250",
223		.data = (void *)INV_MPU9250
224	},
225	{
226		.compatible = "invensense,mpu9255",
227		.data = (void *)INV_MPU9255
228	},
229	{
230		.compatible = "invensense,icm20608",
231		.data = (void *)INV_ICM20608
232	},
233	{
234		.compatible = "invensense,icm20608d",
235		.data = (void *)INV_ICM20608D
236	},
237	{
238		.compatible = "invensense,icm20609",
239		.data = (void *)INV_ICM20609
240	},
241	{
242		.compatible = "invensense,icm20689",
243		.data = (void *)INV_ICM20689
244	},
245	{
246		.compatible = "invensense,icm20600",
247		.data = (void *)INV_ICM20600
248	},
249	{
250		.compatible = "invensense,icm20602",
251		.data = (void *)INV_ICM20602
252	},
253	{
254		.compatible = "invensense,icm20690",
255		.data = (void *)INV_ICM20690
256	},
257	{
258		.compatible = "invensense,iam20380",
259		.data = (void *)INV_IAM20380
260	},
261	{
262		.compatible = "invensense,iam20680",
263		.data = (void *)INV_IAM20680
264	},
265	{
266		.compatible = "invensense,iam20680hp",
267		.data = (void *)INV_IAM20680HP
268	},
269	{
270		.compatible = "invensense,iam20680ht",
271		.data = (void *)INV_IAM20680HT
272	},
273	{ }
274};
275MODULE_DEVICE_TABLE(of, inv_of_match);
276
277static const struct acpi_device_id inv_acpi_match[] = {
278	{"INVN6500", INV_MPU6500},
279	{ }
280};
281MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
282
283static struct i2c_driver inv_mpu_driver = {
284	.probe		=	inv_mpu_probe,
285	.remove		=	inv_mpu_remove,
286	.id_table	=	inv_mpu_id,
287	.driver = {
288		.of_match_table = inv_of_match,
289		.acpi_match_table = inv_acpi_match,
290		.name	=	"inv-mpu6050-i2c",
291		.pm     =       pm_ptr(&inv_mpu_pmops),
292	},
293};
294
295module_i2c_driver(inv_mpu_driver);
296
297MODULE_AUTHOR("Invensense Corporation");
298MODULE_DESCRIPTION("Invensense device MPU6050 driver");
299MODULE_LICENSE("GPL");
300MODULE_IMPORT_NS("IIO_MPU6050");