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 "inv_mpu_iio.h"
21 
22 static const struct regmap_config inv_mpu_regmap_config = {
23 	.reg_bits = 8,
24 	.val_bits = 8,
25 };
26 
27 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id)
28 {
29 	struct iio_dev *indio_dev = i2c_mux_priv(muxc);
30 	struct inv_mpu6050_state *st = iio_priv(indio_dev);
31 	int ret = 0;
32 
33 	/* Use the same mutex which was used everywhere to protect power-op */
34 	mutex_lock(&indio_dev->mlock);
35 	if (!st->powerup_count) {
36 		ret = regmap_write(st->map, st->reg->pwr_mgmt_1, 0);
37 		if (ret)
38 			goto write_error;
39 
40 		usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
41 			     INV_MPU6050_REG_UP_TIME_MAX);
42 	}
43 	if (!ret) {
44 		st->powerup_count++;
45 		ret = regmap_write(st->map, st->reg->int_pin_cfg,
46 				   INV_MPU6050_INT_PIN_CFG |
47 				   INV_MPU6050_BIT_BYPASS_EN);
48 	}
49 write_error:
50 	mutex_unlock(&indio_dev->mlock);
51 
52 	return ret;
53 }
54 
55 static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id)
56 {
57 	struct iio_dev *indio_dev = i2c_mux_priv(muxc);
58 	struct inv_mpu6050_state *st = iio_priv(indio_dev);
59 
60 	mutex_lock(&indio_dev->mlock);
61 	/* It doesn't really mattter, if any of the calls fails */
62 	regmap_write(st->map, st->reg->int_pin_cfg, INV_MPU6050_INT_PIN_CFG);
63 	st->powerup_count--;
64 	if (!st->powerup_count)
65 		regmap_write(st->map, st->reg->pwr_mgmt_1,
66 			     INV_MPU6050_BIT_SLEEP);
67 	mutex_unlock(&indio_dev->mlock);
68 
69 	return 0;
70 }
71 
72 static const char *inv_mpu_match_acpi_device(struct device *dev, int *chip_id)
73 {
74 	const struct acpi_device_id *id;
75 
76 	id = acpi_match_device(dev->driver->acpi_match_table, dev);
77 	if (!id)
78 		return NULL;
79 
80 	*chip_id = (int)id->driver_data;
81 
82 	return dev_name(dev);
83 }
84 
85 /**
86  *  inv_mpu_probe() - probe function.
87  *  @client:          i2c client.
88  *  @id:              i2c device id.
89  *
90  *  Returns 0 on success, a negative error code otherwise.
91  */
92 static int inv_mpu_probe(struct i2c_client *client,
93 			 const struct i2c_device_id *id)
94 {
95 	struct inv_mpu6050_state *st;
96 	int result, chip_type;
97 	struct regmap *regmap;
98 	const char *name;
99 
100 	if (!i2c_check_functionality(client->adapter,
101 				     I2C_FUNC_SMBUS_I2C_BLOCK))
102 		return -EOPNOTSUPP;
103 
104 	if (id) {
105 		chip_type = (int)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 	st->muxc = i2c_mux_alloc(client->adapter, &client->dev,
129 				 1, 0, I2C_MUX_LOCKED,
130 				 inv_mpu6050_select_bypass,
131 				 inv_mpu6050_deselect_bypass);
132 	if (!st->muxc) {
133 		result = -ENOMEM;
134 		goto out_unreg_device;
135 	}
136 	st->muxc->priv = dev_get_drvdata(&client->dev);
137 	result = i2c_mux_add_adapter(st->muxc, 0, 0, 0);
138 	if (result)
139 		goto out_unreg_device;
140 
141 	result = inv_mpu_acpi_create_mux_client(client);
142 	if (result)
143 		goto out_del_mux;
144 
145 	return 0;
146 
147 out_del_mux:
148 	i2c_mux_del_adapters(st->muxc);
149 out_unreg_device:
150 	inv_mpu_core_remove(&client->dev);
151 	return result;
152 }
153 
154 static int inv_mpu_remove(struct i2c_client *client)
155 {
156 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
157 	struct inv_mpu6050_state *st = iio_priv(indio_dev);
158 
159 	inv_mpu_acpi_delete_mux_client(client);
160 	i2c_mux_del_adapters(st->muxc);
161 
162 	return inv_mpu_core_remove(&client->dev);
163 }
164 
165 /*
166  * device id table is used to identify what device can be
167  * supported by this driver
168  */
169 static const struct i2c_device_id inv_mpu_id[] = {
170 	{"mpu6050", INV_MPU6050},
171 	{"mpu6500", INV_MPU6500},
172 	{"mpu9150", INV_MPU9150},
173 	{"icm20608", INV_ICM20608},
174 	{}
175 };
176 
177 MODULE_DEVICE_TABLE(i2c, inv_mpu_id);
178 
179 static const struct acpi_device_id inv_acpi_match[] = {
180 	{"INVN6500", INV_MPU6500},
181 	{ },
182 };
183 
184 MODULE_DEVICE_TABLE(acpi, inv_acpi_match);
185 
186 static struct i2c_driver inv_mpu_driver = {
187 	.probe		=	inv_mpu_probe,
188 	.remove		=	inv_mpu_remove,
189 	.id_table	=	inv_mpu_id,
190 	.driver = {
191 		.acpi_match_table = ACPI_PTR(inv_acpi_match),
192 		.name	=	"inv-mpu6050-i2c",
193 		.pm     =       &inv_mpu_pmops,
194 	},
195 };
196 
197 module_i2c_driver(inv_mpu_driver);
198 
199 MODULE_AUTHOR("Invensense Corporation");
200 MODULE_DESCRIPTION("Invensense device MPU6050 driver");
201 MODULE_LICENSE("GPL");
202