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_IAM20680:
38		/* no i2c auxiliary bus on the chip */
39		return false;
40	case INV_MPU9150:
41	case INV_MPU9250:
42	case INV_MPU9255:
43		if (st->magn_disabled)
44			return true;
45		else
46			return false;
47	default:
48		return true;
49	}
50}
51
52static int inv_mpu_i2c_aux_setup(struct iio_dev *indio_dev)
53{
54	struct inv_mpu6050_state *st = iio_priv(indio_dev);
55	struct device *dev = indio_dev->dev.parent;
56	struct fwnode_handle *mux_node;
57	int ret;
58
59	/*
60	 * MPU9xxx magnetometer support requires to disable i2c auxiliary bus.
61	 * To ensure backward compatibility with existing setups, do not disable
62	 * i2c auxiliary bus if it used.
63	 * Check for i2c-gate node in devicetree and set magnetometer disabled.
64	 * Only MPU6500 is supported by ACPI, no need to check.
65	 */
66	switch (st->chip_type) {
67	case INV_MPU9150:
68	case INV_MPU9250:
69	case INV_MPU9255:
70		mux_node = device_get_named_child_node(dev, "i2c-gate");
71		if (mux_node != NULL) {
72			st->magn_disabled = true;
73			dev_warn(dev, "disable internal use of magnetometer\n");
74		}
75		fwnode_handle_put(mux_node);
76		break;
77	default:
78		break;
79	}
80
81	/* enable i2c bypass when using i2c auxiliary bus */
82	if (inv_mpu_i2c_aux_bus(dev)) {
83		ret = regmap_write(st->map, st->reg->int_pin_cfg,
84				   st->irq_mask | INV_MPU6050_BIT_BYPASS_EN);
85		if (ret)
86			return ret;
87	}
88
89	return 0;
90}
91
92/**
93 *  inv_mpu_probe() - probe function.
94 *  @client:          i2c client.
95 *
96 *  Returns 0 on success, a negative error code otherwise.
97 */
98static int inv_mpu_probe(struct i2c_client *client)
99{
100	const struct i2c_device_id *id = i2c_client_get_device_id(client);
101	const void *match;
102	struct inv_mpu6050_state *st;
103	int result;
104	enum inv_devices chip_type;
105	struct regmap *regmap;
106	const char *name;
107
108	if (!i2c_check_functionality(client->adapter,
109				     I2C_FUNC_SMBUS_I2C_BLOCK))
110		return -EOPNOTSUPP;
111
112	match = device_get_match_data(&client->dev);
113	if (match) {
114		chip_type = (uintptr_t)match;
115		name = client->name;
116	} else if (id) {
117		chip_type = (enum inv_devices)
118			id->driver_data;
119		name = id->name;
120	} else {
121		return -ENOSYS;
122	}
123
124	regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
125	if (IS_ERR(regmap)) {
126		dev_err(&client->dev, "Failed to register i2c regmap: %pe\n",
127			regmap);
128		return PTR_ERR(regmap);
129	}
130
131	result = inv_mpu_core_probe(regmap, client->irq, name,
132				    inv_mpu_i2c_aux_setup, chip_type);
133	if (result < 0)
134		return result;
135
136	st = iio_priv(dev_get_drvdata(&client->dev));
137	if (inv_mpu_i2c_aux_bus(&client->dev)) {
138		/* declare i2c auxiliary bus */
139		st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
140					 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
141					 inv_mpu6050_select_bypass, NULL);
142		if (!st->muxc)
143			return -ENOMEM;
144		st->muxc->priv = dev_get_drvdata(&client->dev);
145		result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
146		if (result)
147			return result;
148		result = inv_mpu_acpi_create_mux_client(client);
149		if (result)
150			goto out_del_mux;
151	}
152
153	return 0;
154
155out_del_mux:
156	i2c_mux_del_adapters(st->muxc);
157	return result;
158}
159
160static void inv_mpu_remove(struct i2c_client *client)
161{
162	struct iio_dev *indio_dev = i2c_get_clientdata(client);
163	struct inv_mpu6050_state *st = iio_priv(indio_dev);
164
165	if (st->muxc) {
166		inv_mpu_acpi_delete_mux_client(client);
167		i2c_mux_del_adapters(st->muxc);
168	}
169}
170
171/*
172 * device id table is used to identify what device can be
173 * supported by this driver
174 */
175static const struct i2c_device_id inv_mpu_id[] = {
176	{"mpu6050", INV_MPU6050},
177	{"mpu6500", INV_MPU6500},
178	{"mpu6515", INV_MPU6515},
179	{"mpu6880", INV_MPU6880},
180	{"mpu9150", INV_MPU9150},
181	{"mpu9250", INV_MPU9250},
182	{"mpu9255", INV_MPU9255},
183	{"icm20608", INV_ICM20608},
184	{"icm20608d", INV_ICM20608D},
185	{"icm20609", INV_ICM20609},
186	{"icm20689", INV_ICM20689},
187	{"icm20600", INV_ICM20600},
188	{"icm20602", INV_ICM20602},
189	{"icm20690", INV_ICM20690},
190	{"iam20680", INV_IAM20680},
191	{}
192};
193
194MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
195
196static const struct of_device_id inv_of_match[] = {
197	{
198		.compatible = "invensense,mpu6050",
199		.data = (void *)INV_MPU6050
200	},
201	{
202		.compatible = "invensense,mpu6500",
203		.data = (void *)INV_MPU6500
204	},
205	{
206		.compatible = "invensense,mpu6515",
207		.data = (void *)INV_MPU6515
208	},
209	{
210		.compatible = "invensense,mpu6880",
211		.data = (void *)INV_MPU6880
212	},
213	{
214		.compatible = "invensense,mpu9150",
215		.data = (void *)INV_MPU9150
216	},
217	{
218		.compatible = "invensense,mpu9250",
219		.data = (void *)INV_MPU9250
220	},
221	{
222		.compatible = "invensense,mpu9255",
223		.data = (void *)INV_MPU9255
224	},
225	{
226		.compatible = "invensense,icm20608",
227		.data = (void *)INV_ICM20608
228	},
229	{
230		.compatible = "invensense,icm20608d",
231		.data = (void *)INV_ICM20608D
232	},
233	{
234		.compatible = "invensense,icm20609",
235		.data = (void *)INV_ICM20609
236	},
237	{
238		.compatible = "invensense,icm20689",
239		.data = (void *)INV_ICM20689
240	},
241	{
242		.compatible = "invensense,icm20600",
243		.data = (void *)INV_ICM20600
244	},
245	{
246		.compatible = "invensense,icm20602",
247		.data = (void *)INV_ICM20602
248	},
249	{
250		.compatible = "invensense,icm20690",
251		.data = (void *)INV_ICM20690
252	},
253	{
254		.compatible = "invensense,iam20680",
255		.data = (void *)INV_IAM20680
256	},
257	{ }
258};
259MODULE_DEVICE_TABLE(of, inv_of_match);
260
261static const struct acpi_device_id inv_acpi_match[] = {
262	{"INVN6500", INV_MPU6500},
263	{ },
264};
265MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
266
267static struct i2c_driver inv_mpu_driver = {
268	.probe		=	inv_mpu_probe,
269	.remove		=	inv_mpu_remove,
270	.id_table	=	inv_mpu_id,
271	.driver = {
272		.of_match_table = inv_of_match,
273		.acpi_match_table = inv_acpi_match,
274		.name	=	"inv-mpu6050-i2c",
275		.pm     =       pm_ptr(&inv_mpu_pmops),
276	},
277};
278
279module_i2c_driver(inv_mpu_driver);
280
281MODULE_AUTHOR("Invensense Corporation");
282MODULE_DESCRIPTION("Invensense device MPU6050 driver");
283MODULE_LICENSE("GPL");
284MODULE_IMPORT_NS(IIO_MPU6050);
285