98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* AD5671R, AD5675R, AD5694, AD5694R, AD5695R, AD5696, AD5696R
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* Digital to analog converters driver
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*
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* Copyright 2018 Analog Devices Inc.
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*/
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#include "ad5686.h"
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#include <linux/module.h>
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#include <linux/i2c.h>
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static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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struct i2c_msg msg[2] = {
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{
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.addr = i2c->addr,
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.flags = i2c->flags,
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.len = 3,
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.buf = &st->data[0].d8[1],
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},
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{
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.addr = i2c->addr,
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.flags = i2c->flags | I2C_M_RD,
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.len = 2,
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.buf = (char *)&st->data[0].d16,
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},
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};
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int ret;
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st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
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AD5686_ADDR(addr) |
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0x00);
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ret = i2c_transfer(i2c->adapter, msg, 2);
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if (ret < 0)
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return ret;
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return be16_to_cpu(st->data[0].d16);
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}
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static int ad5686_i2c_write(struct ad5686_state *st,
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u8 cmd, u8 addr, u16 val)
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{
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struct i2c_client *i2c = to_i2c_client(st->dev);
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int ret;
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st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
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| val);
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ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
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if (ret < 0)
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return ret;
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return (ret != 3) ? -EIO : 0;
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}
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static int ad5686_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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return ad5686_probe(&i2c->dev, id->driver_data, id->name,
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ad5686_i2c_write, ad5686_i2c_read);
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}
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static int ad5686_i2c_remove(struct i2c_client *i2c)
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{
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return ad5686_remove(&i2c->dev);
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}
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static const struct i2c_device_id ad5686_i2c_id[] = {
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{"ad5671r", ID_AD5671R},
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{"ad5675r", ID_AD5675R},
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{"ad5694", ID_AD5694},
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{"ad5694r", ID_AD5694R},
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{"ad5695r", ID_AD5695R},
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{"ad5696", ID_AD5696},
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{"ad5696r", ID_AD5696R},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
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static struct i2c_driver ad5686_i2c_driver = {
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.driver = {
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.name = "ad5696",
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},
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.probe = ad5686_i2c_probe,
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.remove = ad5686_i2c_remove,
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.id_table = ad5686_i2c_id,
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};
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module_i2c_driver(ad5686_i2c_driver);
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MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
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MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
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MODULE_LICENSE("GPL v2");
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