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iio: imu: inv_icm42600: add I2C driver for inv_icm42600 driver
Add I2C driver for InvenSense ICM-426xxx devices. Configure bus signal slew rates as indicated in the datasheet. Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Jean-Baptiste Maneyrol
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Jonathan Cameron
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Jun 27, 2020
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// SPDX-License-Identifier: GPL-2.0-or-later | ||
/* | ||
* Copyright (C) 2020 InvenSense, Inc. | ||
*/ | ||
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#include <linux/kernel.h> | ||
#include <linux/device.h> | ||
#include <linux/module.h> | ||
#include <linux/mod_devicetable.h> | ||
#include <linux/i2c.h> | ||
#include <linux/regmap.h> | ||
#include <linux/property.h> | ||
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#include "inv_icm42600.h" | ||
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static int inv_icm42600_i2c_bus_setup(struct inv_icm42600_state *st) | ||
{ | ||
unsigned int mask, val; | ||
int ret; | ||
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/* setup interface registers */ | ||
ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG6, | ||
INV_ICM42600_INTF_CONFIG6_MASK, | ||
INV_ICM42600_INTF_CONFIG6_I3C_EN); | ||
if (ret) | ||
return ret; | ||
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ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG4, | ||
INV_ICM42600_INTF_CONFIG4_I3C_BUS_ONLY, 0); | ||
if (ret) | ||
return ret; | ||
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/* set slew rates for I2C and SPI */ | ||
mask = INV_ICM42600_DRIVE_CONFIG_I2C_MASK | | ||
INV_ICM42600_DRIVE_CONFIG_SPI_MASK; | ||
val = INV_ICM42600_DRIVE_CONFIG_I2C(INV_ICM42600_SLEW_RATE_12_36NS) | | ||
INV_ICM42600_DRIVE_CONFIG_SPI(INV_ICM42600_SLEW_RATE_12_36NS); | ||
ret = regmap_update_bits(st->map, INV_ICM42600_REG_DRIVE_CONFIG, | ||
mask, val); | ||
if (ret) | ||
return ret; | ||
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/* disable SPI bus */ | ||
return regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0, | ||
INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_MASK, | ||
INV_ICM42600_INTF_CONFIG0_UI_SIFS_CFG_SPI_DIS); | ||
} | ||
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static int inv_icm42600_probe(struct i2c_client *client) | ||
{ | ||
const void *match; | ||
enum inv_icm42600_chip chip; | ||
struct regmap *regmap; | ||
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) | ||
return -ENOTSUPP; | ||
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match = device_get_match_data(&client->dev); | ||
if (!match) | ||
return -EINVAL; | ||
chip = (enum inv_icm42600_chip)match; | ||
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regmap = devm_regmap_init_i2c(client, &inv_icm42600_regmap_config); | ||
if (IS_ERR(regmap)) | ||
return PTR_ERR(regmap); | ||
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return inv_icm42600_core_probe(regmap, chip, inv_icm42600_i2c_bus_setup); | ||
} | ||
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static const struct of_device_id inv_icm42600_of_matches[] = { | ||
{ | ||
.compatible = "invensense,icm42600", | ||
.data = (void *)INV_CHIP_ICM42600, | ||
}, { | ||
.compatible = "invensense,icm42602", | ||
.data = (void *)INV_CHIP_ICM42602, | ||
}, { | ||
.compatible = "invensense,icm42605", | ||
.data = (void *)INV_CHIP_ICM42605, | ||
}, { | ||
.compatible = "invensense,icm42622", | ||
.data = (void *)INV_CHIP_ICM42622, | ||
}, | ||
{} | ||
}; | ||
MODULE_DEVICE_TABLE(of, inv_icm42600_of_matches); | ||
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static struct i2c_driver inv_icm42600_driver = { | ||
.driver = { | ||
.name = "inv-icm42600-i2c", | ||
.of_match_table = inv_icm42600_of_matches, | ||
.pm = &inv_icm42600_pm_ops, | ||
}, | ||
.probe_new = inv_icm42600_probe, | ||
}; | ||
module_i2c_driver(inv_icm42600_driver); | ||
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MODULE_AUTHOR("InvenSense, Inc."); | ||
MODULE_DESCRIPTION("InvenSense ICM-426xx I2C driver"); | ||
MODULE_LICENSE("GPL"); |