diff options
Diffstat (limited to 'drivers/iio/dac/ad5593r.c')
| -rw-r--r-- | drivers/iio/dac/ad5593r.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/iio/dac/ad5593r.c b/drivers/iio/dac/ad5593r.c new file mode 100644 index 000000000..8e5e014e0 --- /dev/null +++ b/drivers/iio/dac/ad5593r.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AD5593R Digital <-> Analog converters driver + * + * Copyright 2015-2016 Analog Devices Inc. + * Author: Paul Cercueil <paul.cercueil@analog.com> + */ + +#include "ad5592r-base.h" + +#include <linux/bitops.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> + +#include <asm/unaligned.h> + +#define AD5593R_MODE_CONF (0 << 4) +#define AD5593R_MODE_DAC_WRITE (1 << 4) +#define AD5593R_MODE_ADC_READBACK (4 << 4) +#define AD5593R_MODE_DAC_READBACK (5 << 4) +#define AD5593R_MODE_GPIO_READBACK (6 << 4) +#define AD5593R_MODE_REG_READBACK (7 << 4) + +static int ad5593r_read_word(struct i2c_client *i2c, u8 reg, u16 *value) +{ + int ret; + u8 buf[2]; + + ret = i2c_smbus_write_byte(i2c, reg); + if (ret < 0) + return ret; + + ret = i2c_master_recv(i2c, buf, sizeof(buf)); + if (ret < 0) + return ret; + + *value = get_unaligned_be16(buf); + + return 0; +} + +static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + + return i2c_smbus_write_word_swapped(i2c, + AD5593R_MODE_DAC_WRITE | chan, value); +} + +static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + s32 val; + + val = i2c_smbus_write_word_swapped(i2c, + AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan)); + if (val < 0) + return (int) val; + + return ad5593r_read_word(i2c, AD5593R_MODE_ADC_READBACK, value); +} + +static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + + return i2c_smbus_write_word_swapped(i2c, + AD5593R_MODE_CONF | reg, value); +} + +static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + + return ad5593r_read_word(i2c, AD5593R_MODE_REG_READBACK | reg, value); +} + +static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + u16 val; + int ret; + + ret = ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, &val); + if (ret) + return ret; + + *value = (u8) val; + + return 0; +} + +static const struct ad5592r_rw_ops ad5593r_rw_ops = { + .write_dac = ad5593r_write_dac, + .read_adc = ad5593r_read_adc, + .reg_write = ad5593r_reg_write, + .reg_read = ad5593r_reg_read, + .gpio_read = ad5593r_gpio_read, +}; + +static int ad5593r_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + if (!i2c_check_functionality(i2c->adapter, + I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C)) + return -EOPNOTSUPP; + + return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops); +} + +static void ad5593r_i2c_remove(struct i2c_client *i2c) +{ + ad5592r_remove(&i2c->dev); +} + +static const struct i2c_device_id ad5593r_i2c_ids[] = { + { .name = "ad5593r", }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids); + +static const struct of_device_id ad5593r_of_match[] = { + { .compatible = "adi,ad5593r", }, + {}, +}; +MODULE_DEVICE_TABLE(of, ad5593r_of_match); + +static const struct acpi_device_id ad5593r_acpi_match[] = { + {"ADS5593", }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match); + +static struct i2c_driver ad5593r_driver = { + .driver = { + .name = "ad5593r", + .of_match_table = ad5593r_of_match, + .acpi_match_table = ad5593r_acpi_match, + }, + .probe = ad5593r_i2c_probe, + .remove = ad5593r_i2c_remove, + .id_table = ad5593r_i2c_ids, +}; +module_i2c_driver(ad5593r_driver); + +MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>"); +MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(IIO_AD5592R); |