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 
16 static const struct regmap_config inv_mpu_regmap_config = {
17 	.reg_bits = 8,
18 	.val_bits = 8,
19 };
20 
21 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
22 {
23 	return 0;
24 }
25 
26 static 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 
52 static 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  */
98 static 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 
155 out_del_mux:
156 	i2c_mux_del_adapters(st->muxc);
157 	return result;
158 }
159 
160 static 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  */
175 static 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 
194 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
195 
196 static 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 };
259 MODULE_DEVICE_TABLE(of, inv_of_match);
260 
261 static const struct acpi_device_id inv_acpi_match[] = {
262 	{"INVN6500", INV_MPU6500},
263 	{ },
264 };
265 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
266 
267 static 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 
279 module_i2c_driver(inv_mpu_driver);
280 
281 MODULE_AUTHOR("Invensense Corporation");
282 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
283 MODULE_LICENSE("GPL");
284 MODULE_IMPORT_NS(IIO_MPU6050);
285