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 = 0; 33 34 /* Use the same mutex which was used everywhere to protect power-op */ 35 mutex_lock(&st->lock); 36 if (!st->powerup_count) { 37 ret = regmap_write(st->map, st->reg->pwr_mgmt_1, 0); 38 if (ret) 39 goto write_error; 40 41 usleep_range(INV_MPU6050_REG_UP_TIME_MIN, 42 INV_MPU6050_REG_UP_TIME_MAX); 43 } 44 if (!ret) { 45 st->powerup_count++; 46 ret = regmap_write(st->map, st->reg->int_pin_cfg, 47 INV_MPU6050_INT_PIN_CFG | 48 INV_MPU6050_BIT_BYPASS_EN); 49 } 50 write_error: 51 mutex_unlock(&st->lock); 52 53 return ret; 54 } 55 56 static int inv_mpu6050_deselect_bypass(struct i2c_mux_core *muxc, u32 chan_id) 57 { 58 struct iio_dev *indio_dev = i2c_mux_priv(muxc); 59 struct inv_mpu6050_state *st = iio_priv(indio_dev); 60 61 mutex_lock(&st->lock); 62 /* It doesn't really mattter, if any of the calls fails */ 63 regmap_write(st->map, st->reg->int_pin_cfg, INV_MPU6050_INT_PIN_CFG); 64 st->powerup_count--; 65 if (!st->powerup_count) 66 regmap_write(st->map, st->reg->pwr_mgmt_1, 67 INV_MPU6050_BIT_SLEEP); 68 mutex_unlock(&st->lock); 69 70 return 0; 71 } 72 73 static const char *inv_mpu_match_acpi_device(struct device *dev, 74 enum inv_devices *chip_id) 75 { 76 const struct acpi_device_id *id; 77 78 id = acpi_match_device(dev->driver->acpi_match_table, dev); 79 if (!id) 80 return NULL; 81 82 *chip_id = (int)id->driver_data; 83 84 return dev_name(dev); 85 } 86 87 /** 88 * inv_mpu_probe() - probe function. 89 * @client: i2c client. 90 * @id: i2c device id. 91 * 92 * Returns 0 on success, a negative error code otherwise. 93 */ 94 static int inv_mpu_probe(struct i2c_client *client, 95 const struct i2c_device_id *id) 96 { 97 struct inv_mpu6050_state *st; 98 int result; 99 enum inv_devices chip_type; 100 struct regmap *regmap; 101 const char *name; 102 103 if (!i2c_check_functionality(client->adapter, 104 I2C_FUNC_SMBUS_I2C_BLOCK)) 105 return -EOPNOTSUPP; 106 107 if (client->dev.of_node) { 108 chip_type = (enum inv_devices) 109 of_device_get_match_data(&client->dev); 110 name = client->name; 111 } else if (id) { 112 chip_type = (enum inv_devices) 113 id->driver_data; 114 name = id->name; 115 } else if (ACPI_HANDLE(&client->dev)) { 116 name = inv_mpu_match_acpi_device(&client->dev, &chip_type); 117 if (!name) 118 return -ENODEV; 119 } else { 120 return -ENOSYS; 121 } 122 123 regmap = devm_regmap_init_i2c(client, &inv_mpu_regmap_config); 124 if (IS_ERR(regmap)) { 125 dev_err(&client->dev, "Failed to register i2c regmap %d\n", 126 (int)PTR_ERR(regmap)); 127 return PTR_ERR(regmap); 128 } 129 130 result = inv_mpu_core_probe(regmap, client->irq, name, 131 NULL, chip_type); 132 if (result < 0) 133 return result; 134 135 st = iio_priv(dev_get_drvdata(&client->dev)); 136 st->muxc = i2c_mux_alloc(client->adapter, &client->dev, 137 1, 0, I2C_MUX_LOCKED | I2C_MUX_GATE, 138 inv_mpu6050_select_bypass, 139 inv_mpu6050_deselect_bypass); 140 if (!st->muxc) { 141 result = -ENOMEM; 142 goto out_unreg_device; 143 } 144 st->muxc->priv = dev_get_drvdata(&client->dev); 145 result = i2c_mux_add_adapter(st->muxc, 0, 0, 0); 146 if (result) 147 goto out_unreg_device; 148 149 result = inv_mpu_acpi_create_mux_client(client); 150 if (result) 151 goto out_del_mux; 152 153 return 0; 154 155 out_del_mux: 156 i2c_mux_del_adapters(st->muxc); 157 out_unreg_device: 158 inv_mpu_core_remove(&client->dev); 159 return result; 160 } 161 162 static int inv_mpu_remove(struct i2c_client *client) 163 { 164 struct iio_dev *indio_dev = i2c_get_clientdata(client); 165 struct inv_mpu6050_state *st = iio_priv(indio_dev); 166 167 inv_mpu_acpi_delete_mux_client(client); 168 i2c_mux_del_adapters(st->muxc); 169 170 return inv_mpu_core_remove(&client->dev); 171 } 172 173 /* 174 * device id table is used to identify what device can be 175 * supported by this driver 176 */ 177 static const struct i2c_device_id inv_mpu_id[] = { 178 {"mpu6050", INV_MPU6050}, 179 {"mpu6500", INV_MPU6500}, 180 {"mpu9150", INV_MPU9150}, 181 {"mpu9250", INV_MPU9250}, 182 {"icm20608", INV_ICM20608}, 183 {} 184 }; 185 186 MODULE_DEVICE_TABLE(i2c, inv_mpu_id); 187 188 static const struct of_device_id inv_of_match[] = { 189 { 190 .compatible = "invensense,mpu6050", 191 .data = (void *)INV_MPU6050 192 }, 193 { 194 .compatible = "invensense,mpu6500", 195 .data = (void *)INV_MPU6500 196 }, 197 { 198 .compatible = "invensense,mpu9150", 199 .data = (void *)INV_MPU9150 200 }, 201 { 202 .compatible = "invensense,mpu9250", 203 .data = (void *)INV_MPU9250 204 }, 205 { 206 .compatible = "invensense,icm20608", 207 .data = (void *)INV_ICM20608 208 }, 209 { } 210 }; 211 MODULE_DEVICE_TABLE(of, inv_of_match); 212 213 static const struct acpi_device_id inv_acpi_match[] = { 214 {"INVN6500", INV_MPU6500}, 215 { }, 216 }; 217 218 MODULE_DEVICE_TABLE(acpi, inv_acpi_match); 219 220 static struct i2c_driver inv_mpu_driver = { 221 .probe = inv_mpu_probe, 222 .remove = inv_mpu_remove, 223 .id_table = inv_mpu_id, 224 .driver = { 225 .of_match_table = inv_of_match, 226 .acpi_match_table = ACPI_PTR(inv_acpi_match), 227 .name = "inv-mpu6050-i2c", 228 .pm = &inv_mpu_pmops, 229 }, 230 }; 231 232 module_i2c_driver(inv_mpu_driver); 233 234 MODULE_AUTHOR("Invensense Corporation"); 235 MODULE_DESCRIPTION("Invensense device MPU6050 driver"); 236 MODULE_LICENSE("GPL"); 237