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 static bool inv_mpu_i2c_aux_bus(struct device *dev) 72 { 73 struct inv_mpu6050_state *st = iio_priv(dev_get_drvdata(dev)); 74 75 switch (st->chip_type) { 76 case INV_ICM20608: 77 case INV_ICM20602: 78 /* no i2c auxiliary bus on the chip */ 79 return false; 80 case INV_MPU9150: 81 case INV_MPU9250: 82 case INV_MPU9255: 83 if (st->magn_disabled) 84 return true; 85 else 86 return false; 87 default: 88 return true; 89 } 90 } 91 92 /* 93 * MPU9xxx magnetometer support requires to disable i2c auxiliary bus support. 94 * To ensure backward compatibility with existing setups, do not disable 95 * i2c auxiliary bus if it used. 96 * Check for i2c-gate node in devicetree and set magnetometer disabled. 97 * Only MPU6500 is supported by ACPI, no need to check. 98 */ 99 static int inv_mpu_magn_disable(struct iio_dev *indio_dev) 100 { 101 struct inv_mpu6050_state *st = iio_priv(indio_dev); 102 struct device *dev = indio_dev->dev.parent; 103 struct device_node *mux_node; 104 105 switch (st->chip_type) { 106 case INV_MPU9150: 107 case INV_MPU9250: 108 case INV_MPU9255: 109 mux_node = of_get_child_by_name(dev->of_node, "i2c-gate"); 110 if (mux_node != NULL) { 111 st->magn_disabled = true; 112 dev_warn(dev, "disable internal use of magnetometer\n"); 113 } 114 of_node_put(mux_node); 115 break; 116 default: 117 break; 118 } 119 120 return 0; 121 } 122 123 /** 124 * inv_mpu_probe() - probe function. 125 * @client: i2c client. 126 * @id: i2c device id. 127 * 128 * Returns 0 on success, a negative error code otherwise. 129 */ 130 static int inv_mpu_probe(struct i2c_client *client, 131 const struct i2c_device_id *id) 132 { 133 struct inv_mpu6050_state *st; 134 int result; 135 enum inv_devices chip_type; 136 struct regmap *regmap; 137 const char *name; 138 139 if (!i2c_check_functionality(client->adapter, 140 I2C_FUNC_SMBUS_I2C_BLOCK)) 141 return -EOPNOTSUPP; 142 143 if (client->dev.of_node) { 144 chip_type = (enum inv_devices) 145 of_device_get_match_data(&client->dev); 146 name = client->name; 147 } else if (id) { 148 chip_type = (enum inv_devices) 149 id->driver_data; 150 name = id->name; 151 } else if (ACPI_HANDLE(&client->dev)) { 152 name = inv_mpu_match_acpi_device(&client->dev, &chip_type); 153 if (!name) 154 return -ENODEV; 155 } else { 156 return -ENOSYS; 157 } 158 159 regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config); 160 if (IS_ERR(regmap)) { 161 dev_err(&client->dev, "Failed to register i2c regmap %d\n", 162 (int)PTR_ERR(regmap)); 163 return PTR_ERR(regmap); 164 } 165 166 result = inv_mpu_core_probe(regmap, client->irq, name, 167 inv_mpu_magn_disable, chip_type); 168 if (result < 0) 169 return result; 170 171 st = iio_priv(dev_get_drvdata(&client->dev)); 172 if (inv_mpu_i2c_aux_bus(&client->dev)) { 173 /* declare i2c auxiliary bus */ 174 st->muxc = i2c_mux_alloc(client->adapter, &client->dev, 175 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, 176 inv_mpu6050_select_bypass, 177 inv_mpu6050_deselect_bypass); 178 if (!st->muxc) 179 return -ENOMEM; 180 st->muxc->priv = dev_get_drvdata(&client->dev); 181 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0); 182 if (result) 183 return result; 184 result = inv_mpu_acpi_create_mux_client(client); 185 if (result) 186 goto out_del_mux; 187 } 188 189 return 0; 190 191 out_del_mux: 192 i2c_mux_del_adapters(st->muxc); 193 return result; 194 } 195 196 static int inv_mpu_remove(struct i2c_client *client) 197 { 198 struct iio_dev *indio_dev = i2c_get_clientdata(client); 199 struct inv_mpu6050_state *st = iio_priv(indio_dev); 200 201 if (st->muxc) { 202 inv_mpu_acpi_delete_mux_client(client); 203 i2c_mux_del_adapters(st->muxc); 204 } 205 206 return 0; 207 } 208 209 /* 210 * device id table is used to identify what device can be 211 * supported by this driver 212 */ 213 static const struct i2c_device_id inv_mpu_id[] = { 214 {"mpu6050", INV_MPU6050}, 215 {"mpu6500", INV_MPU6500}, 216 {"mpu6515", INV_MPU6515}, 217 {"mpu9150", INV_MPU9150}, 218 {"mpu9250", INV_MPU9250}, 219 {"mpu9255", INV_MPU9255}, 220 {"icm20608", INV_ICM20608}, 221 {"icm20602", INV_ICM20602}, 222 {} 223 }; 224 225 MODULE_DEVICE_TABLE(i2c, inv_mpu_id); 226 227 static const struct of_device_id inv_of_match[] = { 228 { 229 .compatible = "invensense,mpu6050", 230 .data = (void *)INV_MPU6050 231 }, 232 { 233 .compatible = "invensense,mpu6500", 234 .data = (void *)INV_MPU6500 235 }, 236 { 237 .compatible = "invensense,mpu6515", 238 .data = (void *)INV_MPU6515 239 }, 240 { 241 .compatible = "invensense,mpu9150", 242 .data = (void *)INV_MPU9150 243 }, 244 { 245 .compatible = "invensense,mpu9250", 246 .data = (void *)INV_MPU9250 247 }, 248 { 249 .compatible = "invensense,mpu9255", 250 .data = (void *)INV_MPU9255 251 }, 252 { 253 .compatible = "invensense,icm20608", 254 .data = (void *)INV_ICM20608 255 }, 256 { 257 .compatible = "invensense,icm20602", 258 .data = (void *)INV_ICM20602 259 }, 260 { } 261 }; 262 MODULE_DEVICE_TABLE(of, inv_of_match); 263 264 static const struct acpi_device_id inv_acpi_match[] = { 265 {"INVN6500", INV_MPU6500}, 266 { }, 267 }; 268 269 MODULE_DEVICE_TABLE(acpi, inv_acpi_match); 270 271 static struct i2c_driver inv_mpu_driver = { 272 .probe = inv_mpu_probe, 273 .remove = inv_mpu_remove, 274 .id_table = inv_mpu_id, 275 .driver = { 276 .of_match_table = inv_of_match, 277 .acpi_match_table = ACPI_PTR(inv_acpi_match), 278 .name = "inv-mpu6050-i2c", 279 .pm = &inv_mpu_pmops, 280 }, 281 }; 282 283 module_i2c_driver(inv_mpu_driver); 284 285 MODULE_AUTHOR("Invensense Corporation"); 286 MODULE_DESCRIPTION("Invensense device MPU6050 driver"); 287 MODULE_LICENSE("GPL"); 288