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 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 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 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 */ 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 /* no i2c auxiliary bus on the chip */ 131 break; 132 default: 133 /* declare i2c auxiliary bus */ 134 st->muxc = i2c_mux_alloc(client->adapter, &client->dev, 135 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, 136 inv_mpu6050_select_bypass, 137 inv_mpu6050_deselect_bypass); 138 if (!st->muxc) 139 return -ENOMEM; 140 st->muxc->priv = dev_get_drvdata(&client->dev); 141 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0); 142 if (result) 143 return result; 144 result = inv_mpu_acpi_create_mux_client(client); 145 if (result) 146 goto out_del_mux; 147 break; 148 } 149 150 return 0; 151 152 out_del_mux: 153 i2c_mux_del_adapters(st->muxc); 154 return result; 155 } 156 157 static int inv_mpu_remove(struct i2c_client *client) 158 { 159 struct iio_dev *indio_dev = i2c_get_clientdata(client); 160 struct inv_mpu6050_state *st = iio_priv(indio_dev); 161 162 if (st->muxc) { 163 inv_mpu_acpi_delete_mux_client(client); 164 i2c_mux_del_adapters(st->muxc); 165 } 166 167 return 0; 168 } 169 170 /* 171 * device id table is used to identify what device can be 172 * supported by this driver 173 */ 174 static const struct i2c_device_id inv_mpu_id[] = { 175 {"mpu6050", INV_MPU6050}, 176 {"mpu6500", INV_MPU6500}, 177 {"mpu9150", INV_MPU9150}, 178 {"mpu9250", INV_MPU9250}, 179 {"mpu9255", INV_MPU9255}, 180 {"icm20608", INV_ICM20608}, 181 {} 182 }; 183 184 MODULE_DEVICE_TABLE(i2c, inv_mpu_id); 185 186 static const struct of_device_id inv_of_match[] = { 187 { 188 .compatible = "invensense,mpu6050", 189 .data = (void *)INV_MPU6050 190 }, 191 { 192 .compatible = "invensense,mpu6500", 193 .data = (void *)INV_MPU6500 194 }, 195 { 196 .compatible = "invensense,mpu9150", 197 .data = (void *)INV_MPU9150 198 }, 199 { 200 .compatible = "invensense,mpu9250", 201 .data = (void *)INV_MPU9250 202 }, 203 { 204 .compatible = "invensense,mpu9255", 205 .data = (void *)INV_MPU9255 206 }, 207 { 208 .compatible = "invensense,icm20608", 209 .data = (void *)INV_ICM20608 210 }, 211 { } 212 }; 213 MODULE_DEVICE_TABLE(of, inv_of_match); 214 215 static const struct acpi_device_id inv_acpi_match[] = { 216 {"INVN6500", INV_MPU6500}, 217 { }, 218 }; 219 220 MODULE_DEVICE_TABLE(acpi, inv_acpi_match); 221 222 static struct i2c_driver inv_mpu_driver = { 223 .probe = inv_mpu_probe, 224 .remove = inv_mpu_remove, 225 .id_table = inv_mpu_id, 226 .driver = { 227 .of_match_table = inv_of_match, 228 .acpi_match_table = ACPI_PTR(inv_acpi_match), 229 .name = "inv-mpu6050-i2c", 230 .pm = &inv_mpu_pmops, 231 }, 232 }; 233 234 module_i2c_driver(inv_mpu_driver); 235 236 MODULE_AUTHOR("Invensense Corporation"); 237 MODULE_DESCRIPTION("Invensense device MPU6050 driver"); 238 MODULE_LICENSE("GPL"); 239