1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2020 InvenSense, Inc. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/device.h> 8 #include <linux/module.h> 9 #include <linux/mod_devicetable.h> 10 #include <linux/i2c.h> 11 #include <linux/regmap.h> 12 #include <linux/property.h> 13 14 #include "inv_icm42600.h" 15 16 static int inv_icm42600_i2c_bus_setup(struct inv_icm42600_state *st) 17 { 18 unsigned int mask, val; 19 int ret; 20 21 /* 22 * setup interface registers 23 * This register write to REG_INTF_CONFIG6 enables a spike filter that 24 * is impacting the line and can prevent the I2C ACK to be seen by the 25 * controller. So we don't test the return value. 26 */ 27 regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6, 28 INV_ICM42600_INTF_CONFIG6_MASK, 29 INV_ICM42600_INTF_CONFIG6_I3C_EN); 30 31 ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4, 32 INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0); 33 if (ret) 34 return ret; 35 36 /* set slew rates for I2C and SPI */ 37 mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK | 38 INV_ICM42600_DRIVE_CONFIG_SPI_MASK; 39 val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_12_36NS) | 40 INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_12_36NS); 41 ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG, 42 mask, val); 43 if (ret) 44 return ret; 45 46 /* disable SPI bus */ 47 return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0, 48 INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK, 49 INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS); 50 } 51 52 static int inv_icm42600_probe(struct i2c_client *client) 53 { 54 const void *match; 55 enum inv_icm42600_chip chip; 56 struct regmap *regmap; 57 58 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) 59 return -ENOTSUPP; 60 61 match = device_get_match_data(&client->dev); 62 if (!match) 63 return -EINVAL; 64 chip = (uintptr_t)match; 65 66 regmap = devm_regmap_init_i2c(client, &inv_icm42600_regmap_config); 67 if (IS_ERR(regmap)) 68 return PTR_ERR(regmap); 69 70 return inv_icm42600_core_probe(regmap, chip, client->irq, 71 inv_icm42600_i2c_bus_setup); 72 } 73 74 static const struct of_device_id inv_icm42600_of_matches[] = { 75 { 76 .compatible = "invensense,icm42600", 77 .data = (void *)INV_CHIP_ICM42600, 78 }, { 79 .compatible = "invensense,icm42602", 80 .data = (void *)INV_CHIP_ICM42602, 81 }, { 82 .compatible = "invensense,icm42605", 83 .data = (void *)INV_CHIP_ICM42605, 84 }, { 85 .compatible = "invensense,icm42622", 86 .data = (void *)INV_CHIP_ICM42622, 87 }, { 88 .compatible = "invensense,icm42631", 89 .data = (void *)INV_CHIP_ICM42631, 90 }, 91 {} 92 }; 93 MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches); 94 95 static struct i2c_driver inv_icm42600_driver = { 96 .driver = { 97 .name = "inv-icm42600-i2c", 98 .of_match_table = inv_icm42600_of_matches, 99 .pm = pm_ptr(&inv_icm42600_pm_ops), 100 }, 101 .probe = inv_icm42600_probe, 102 }; 103 module_i2c_driver(inv_icm42600_driver); 104 105 MODULE_AUTHOR("InvenSense, Inc."); 106 MODULE_DESCRIPTION("InvenSense ICM-426xx I2C driver"); 107 MODULE_LICENSE("GPL"); 108 MODULE_IMPORT_NS(IIO_ICM42600); 109