1 /*
2 * Copyright (C) 2012 Invensense, Inc.
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/acpi.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/iio/iio.h>
19 #include <linux/module.h>
20 #include <linux/of_device.h>
21 #include "inv_mpu_iio.h"
22
23 static const struct regmap_config inv_mpu_regmap_config = {
24 .reg_bits = 8,
25 .val_bits = 8,
26 };
27
inv_mpu6050_select_bypass(struct i2c_mux_core * muxc,u32 chan_id)28 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
29 {
30 struct iio_dev *indio_dev = i2c_mux_priv(muxc);
31 struct inv_mpu6050_state *st = iio_priv(indio_dev);
32 int ret;
33
34 mutex_lock(&st->lock);
35
36 ret = inv_mpu6050_set_power_itg(st, true);
37 if (ret)
38 goto error_unlock;
39
40 ret = regmap_write(st->map, st->reg->int_pin_cfg,
41 st->irq_mask | INV_MPU6050_BIT_BYPASS_EN);
42
43 error_unlock:
44 mutex_unlock(&st->lock);
45
46 return ret;
47 }
48
inv_mpu6050_deselect_bypass(struct i2c_mux_core * muxc,u32 chan_id)49 static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id)
50 {
51 struct iio_dev *indio_dev = i2c_mux_priv(muxc);
52 struct inv_mpu6050_state *st = iio_priv(indio_dev);
53
54 mutex_lock(&st->lock);
55
56 /* It doesn't really matter if any of the calls fail */
57 regmap_write(st->map, st->reg->int_pin_cfg, st->irq_mask);
58 inv_mpu6050_set_power_itg(st, false);
59
60 mutex_unlock(&st->lock);
61
62 return 0;
63 }
64
inv_mpu_match_acpi_device(struct device * dev,enum inv_devices * chip_id)65 static const char *inv_mpu_match_acpi_device(struct device *dev,
66 enum inv_devices *chip_id)
67 {
68 const struct acpi_device_id *id;
69
70 id = acpi_match_device(dev->driver->acpi_match_table, dev);
71 if (!id)
72 return NULL;
73
74 *chip_id = (int)id->driver_data;
75
76 return dev_name(dev);
77 }
78
79 /**
80 * inv_mpu_probe() - probe function.
81 * @client: i2c client.
82 * @id: i2c device id.
83 *
84 * Returns 0 on success, a negative error code otherwise.
85 */
inv_mpu_probe(struct i2c_client * client,const struct i2c_device_id * id)86 static int inv_mpu_probe(struct i2c_client *client,
87 const struct i2c_device_id *id)
88 {
89 struct inv_mpu6050_state *st;
90 int result;
91 enum inv_devices chip_type;
92 struct regmap *regmap;
93 const char *name;
94
95 if (!i2c_check_functionality(client->adapter,
96 I2C_FUNC_SMBUS_I2C_BLOCK))
97 return -EOPNOTSUPP;
98
99 if (client->dev.of_node) {
100 chip_type = (enum inv_devices)
101 of_device_get_match_data(&client->dev);
102 name = client->name;
103 } else if (id) {
104 chip_type = (enum inv_devices)
105 id->driver_data;
106 name = id->name;
107 } else if (ACPI_HANDLE(&client->dev)) {
108 name = inv_mpu_match_acpi_device(&client->dev, &chip_type);
109 if (!name)
110 return -ENODEV;
111 } else {
112 return -ENOSYS;
113 }
114
115 regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config);
116 if (IS_ERR(regmap)) {
117 dev_err(&client->dev, "Failed to register i2c regmap %d\n",
118 (int)PTR_ERR(regmap));
119 return PTR_ERR(regmap);
120 }
121
122 result = inv_mpu_core_probe(regmap, client->irq, name,
123 NULL, chip_type);
124 if (result < 0)
125 return result;
126
127 st = iio_priv(dev_get_drvdata(&client->dev));
128 switch (st->chip_type) {
129 case INV_ICM20608:
130 case INV_ICM20602:
131 /* no i2c auxiliary bus on the chip */
132 break;
133 default:
134 /* declare i2c auxiliary bus */
135 st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
136 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE,
137 inv_mpu6050_select_bypass,
138 inv_mpu6050_deselect_bypass);
139 if (!st->muxc)
140 return -ENOMEM;
141 st->muxc->priv = dev_get_drvdata(&client->dev);
142 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
143 if (result)
144 return result;
145 result = inv_mpu_acpi_create_mux_client(client);
146 if (result)
147 goto out_del_mux;
148 break;
149 }
150
151 return 0;
152
153 out_del_mux:
154 i2c_mux_del_adapters(st->muxc);
155 return result;
156 }
157
inv_mpu_remove(struct i2c_client * client)158 static int inv_mpu_remove(struct i2c_client *client)
159 {
160 struct iio_dev *indio_dev = i2c_get_clientdata(client);
161 struct inv_mpu6050_state *st = iio_priv(indio_dev);
162
163 if (st->muxc) {
164 inv_mpu_acpi_delete_mux_client(client);
165 i2c_mux_del_adapters(st->muxc);
166 }
167
168 return 0;
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 {"mpu9150", INV_MPU9150},
180 {"mpu9250", INV_MPU9250},
181 {"mpu9255", INV_MPU9255},
182 {"icm20608", INV_ICM20608},
183 {"icm20602", INV_ICM20602},
184 {}
185 };
186
187 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
188
189 static const struct of_device_id inv_of_match[] = {
190 {
191 .compatible = "invensense,mpu6050",
192 .data = (void *)INV_MPU6050
193 },
194 {
195 .compatible = "invensense,mpu6500",
196 .data = (void *)INV_MPU6500
197 },
198 {
199 .compatible = "invensense,mpu6515",
200 .data = (void *)INV_MPU6515
201 },
202 {
203 .compatible = "invensense,mpu9150",
204 .data = (void *)INV_MPU9150
205 },
206 {
207 .compatible = "invensense,mpu9250",
208 .data = (void *)INV_MPU9250
209 },
210 {
211 .compatible = "invensense,mpu9255",
212 .data = (void *)INV_MPU9255
213 },
214 {
215 .compatible = "invensense,icm20608",
216 .data = (void *)INV_ICM20608
217 },
218 {
219 .compatible = "invensense,icm20602",
220 .data = (void *)INV_ICM20602
221 },
222 { }
223 };
224 MODULE_DEVICE_TABLE(of, inv_of_match);
225
226 static const struct acpi_device_id inv_acpi_match[] = {
227 {"INVN6500", INV_MPU6500},
228 { },
229 };
230
231 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
232
233 static struct i2c_driver inv_mpu_driver = {
234 .probe = inv_mpu_probe,
235 .remove = inv_mpu_remove,
236 .id_table = inv_mpu_id,
237 .driver = {
238 .of_match_table = inv_of_match,
239 .acpi_match_table = ACPI_PTR(inv_acpi_match),
240 .name = "inv-mpu6050-i2c",
241 .pm = &inv_mpu_pmops,
242 },
243 };
244
245 module_i2c_driver(inv_mpu_driver);
246
247 MODULE_AUTHOR("Invensense Corporation");
248 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
249 MODULE_LICENSE("GPL");
250