1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Invensense, Inc. 4 */ 5 6 #include <linux/acpi.h> 7 #include <linux/delay.h> 8 #include <linux/err.h> 9 #include <linux/i2c.h> 10 #include <linux/iio/iio.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include "inv_mpu_iio.h" 14 15 static const struct regmap_config inv_mpu_regmap_config = { 16 .reg_bits = 8, 17 .val_bits = 8, 18 }; 19 20 static int inv_mpu6050_select_bypass(struct i2c_mux_core *muxc, u32 chan_id) 21 { 22 struct iio_dev *indio_dev = i2c_mux_priv(muxc); 23 struct inv_mpu6050_state *st = iio_priv(indio_dev); 24 int ret; 25 26 mutex_lock(&st->lock); 27 28 ret = inv_mpu6050_set_power_itg(st, true); 29 if (ret) 30 goto error_unlock; 31 32 ret = regmap_write(st->map, st->reg->int_pin_cfg, 33 st->irq_mask | INV_MPU6050_BIT_BYPASS_EN); 34 35 error_unlock: 36 mutex_unlock(&st->lock); 37 38 return ret; 39 } 40 41 static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id) 42 { 43 struct iio_dev *indio_dev = i2c_mux_priv(muxc); 44 struct inv_mpu6050_state *st = iio_priv(indio_dev); 45 46 mutex_lock(&st->lock); 47 48 /* It doesn't really matter if any of the calls fail */ 49 regmap_write(st->map, st->reg->int_pin_cfg, st->irq_mask); 50 inv_mpu6050_set_power_itg(st, false); 51 52 mutex_unlock(&st->lock); 53 54 return 0; 55 } 56 57 static const char *inv_mpu_match_acpi_device(struct device *dev, 58 enum inv_devices *chip_id) 59 { 60 const struct acpi_device_id *id; 61 62 id = acpi_match_device(dev->driver->acpi_match_table, dev); 63 if (!id) 64 return NULL; 65 66 *chip_id = (int)id->driver_data; 67 68 return dev_name(dev); 69 } 70 71 /** 72 * inv_mpu_probe() - probe function. 73 * @client: i2c client. 74 * @id: i2c device id. 75 * 76 * Returns 0 on success, a negative error code otherwise. 77 */ 78 static int inv_mpu_probe(struct i2c_client *client, 79 const struct i2c_device_id *id) 80 { 81 struct inv_mpu6050_state *st; 82 int result; 83 enum inv_devices chip_type; 84 struct regmap *regmap; 85 const char *name; 86 87 if (!i2c_check_functionality(client->adapter, 88 I2C_FUNC_SMBUS_I2C_BLOCK)) 89 return -EOPNOTSUPP; 90 91 if (client->dev.of_node) { 92 chip_type = (enum inv_devices) 93 of_device_get_match_data(&client->dev); 94 name = client->name; 95 } else if (id) { 96 chip_type = (enum inv_devices) 97 id->driver_data; 98 name = id->name; 99 } else if (ACPI_HANDLE(&client->dev)) { 100 name = inv_mpu_match_acpi_device(&client->dev, &chip_type); 101 if (!name) 102 return -ENODEV; 103 } else { 104 return -ENOSYS; 105 } 106 107 regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config); 108 if (IS_ERR(regmap)) { 109 dev_err(&client->dev, "Failed to register i2c regmap %d\n", 110 (int)PTR_ERR(regmap)); 111 return PTR_ERR(regmap); 112 } 113 114 result = inv_mpu_core_probe(regmap, client->irq, name, 115 NULL, chip_type); 116 if (result < 0) 117 return result; 118 119 st = iio_priv(dev_get_drvdata(&client->dev)); 120 switch (st->chip_type) { 121 case INV_ICM20608: 122 case INV_ICM20602: 123 /* no i2c auxiliary bus on the chip */ 124 break; 125 default: 126 /* declare i2c auxiliary bus */ 127 st->muxc = i2c_mux_alloc(client->adapter, &client->dev, 128 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, 129 inv_mpu6050_select_bypass, 130 inv_mpu6050_deselect_bypass); 131 if (!st->muxc) 132 return -ENOMEM; 133 st->muxc->priv = dev_get_drvdata(&client->dev); 134 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0); 135 if (result) 136 return result; 137 result = inv_mpu_acpi_create_mux_client(client); 138 if (result) 139 goto out_del_mux; 140 break; 141 } 142 143 return 0; 144 145 out_del_mux: 146 i2c_mux_del_adapters(st->muxc); 147 return result; 148 } 149 150 static int inv_mpu_remove(struct i2c_client *client) 151 { 152 struct iio_dev *indio_dev = i2c_get_clientdata(client); 153 struct inv_mpu6050_state *st = iio_priv(indio_dev); 154 155 if (st->muxc) { 156 inv_mpu_acpi_delete_mux_client(client); 157 i2c_mux_del_adapters(st->muxc); 158 } 159 160 return 0; 161 } 162 163 /* 164 * device id table is used to identify what device can be 165 * supported by this driver 166 */ 167 static const struct i2c_device_id inv_mpu_id[] = { 168 {"mpu6050", INV_MPU6050}, 169 {"mpu6500", INV_MPU6500}, 170 {"mpu6515", INV_MPU6515}, 171 {"mpu9150", INV_MPU9150}, 172 {"mpu9250", INV_MPU9250}, 173 {"mpu9255", INV_MPU9255}, 174 {"icm20608", INV_ICM20608}, 175 {"icm20602", INV_ICM20602}, 176 {} 177 }; 178 179 MODULE_DEVICE_TABLE(i2c, inv_mpu_id); 180 181 static const struct of_device_id inv_of_match[] = { 182 { 183 .compatible = "invensense,mpu6050", 184 .data = (void *)INV_MPU6050 185 }, 186 { 187 .compatible = "invensense,mpu6500", 188 .data = (void *)INV_MPU6500 189 }, 190 { 191 .compatible = "invensense,mpu6515", 192 .data = (void *)INV_MPU6515 193 }, 194 { 195 .compatible = "invensense,mpu9150", 196 .data = (void *)INV_MPU9150 197 }, 198 { 199 .compatible = "invensense,mpu9250", 200 .data = (void *)INV_MPU9250 201 }, 202 { 203 .compatible = "invensense,mpu9255", 204 .data = (void *)INV_MPU9255 205 }, 206 { 207 .compatible = "invensense,icm20608", 208 .data = (void *)INV_ICM20608 209 }, 210 { 211 .compatible = "invensense,icm20602", 212 .data = (void *)INV_ICM20602 213 }, 214 { } 215 }; 216 MODULE_DEVICE_TABLE(of, inv_of_match); 217 218 static const struct acpi_device_id inv_acpi_match[] = { 219 {"INVN6500", INV_MPU6500}, 220 { }, 221 }; 222 223 MODULE_DEVICE_TABLE(acpi, inv_acpi_match); 224 225 static struct i2c_driver inv_mpu_driver = { 226 .probe = inv_mpu_probe, 227 .remove = inv_mpu_remove, 228 .id_table = inv_mpu_id, 229 .driver = { 230 .of_match_table = inv_of_match, 231 .acpi_match_table = ACPI_PTR(inv_acpi_match), 232 .name = "inv-mpu6050-i2c", 233 .pm = &inv_mpu_pmops, 234 }, 235 }; 236 237 module_i2c_driver(inv_mpu_driver); 238 239 MODULE_AUTHOR("Invensense Corporation"); 240 MODULE_DESCRIPTION("Invensense device MPU6050 driver"); 241 MODULE_LICENSE("GPL"); 242