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/*
* Driver for the Analog Devices digital potentiometers (SPI bus)
*
* Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/spi/spi.h>
#include <linux/module.h>
#include "ad525x_dpot.h"
static const struct ad_dpot_id ad_dpot_spi_devlist[] = {
{.name = "ad5160", .devid = AD5160_ID},
{.name = "ad5161", .devid = AD5161_ID},
{.name = "ad5162", .devid = AD5162_ID},
{.name = "ad5165", .devid = AD5165_ID},
{.name = "ad5200", .devid = AD5200_ID},
{.name = "ad5201", .devid = AD5201_ID},
{.name = "ad5203", .devid = AD5203_ID},
{.name = "ad5204", .devid = AD5204_ID},
{.name = "ad5206", .devid = AD5206_ID},
{.name = "ad5207", .devid = AD5207_ID},
{.name = "ad5231", .devid = AD5231_ID},
{.name = "ad5232", .devid = AD5232_ID},
{.name = "ad5233", .devid = AD5233_ID},
{.name = "ad5235", .devid = AD5235_ID},
{.name = "ad5260", .devid = AD5260_ID},
{.name = "ad5262", .devid = AD5262_ID},
{.name = "ad5263", .devid = AD5263_ID},
{.name = "ad5290", .devid = AD5290_ID},
{.name = "ad5291", .devid = AD5291_ID},
{.name = "ad5292", .devid = AD5292_ID},
{.name = "ad5293", .devid = AD5293_ID},
{.name = "ad7376", .devid = AD7376_ID},
{.name = "ad8400", .devid = AD8400_ID},
{.name = "ad8402", .devid = AD8402_ID},
{.name = "ad8403", .devid = AD8403_ID},
{.name = "adn2850", .devid = ADN2850_ID},
{.name = "ad5270", .devid = AD5270_ID},
{.name = "ad5271", .devid = AD5271_ID},
{}
};
/* ------------------------------------------------------------------------- */
/* SPI bus functions */
static int write8(void *client, u8 val)
{
u8 data = val;
return spi_write(client, &data, 1);
}
static int write16(void *client, u8 reg, u8 val)
{
u8 data[2] = {reg, val};
return spi_write(client, data, 2);
}
static int write24(void *client, u8 reg, u16 val)
{
u8 data[3] = {reg, val >> 8, val};
return spi_write(client, data, 3);
}
static int read8(void *client)
{
int ret;
u8 data;
ret = spi_read(client, &data, 1);
if (ret < 0)
return ret;
return data;
}
static int read16(void *client, u8 reg)
{
int ret;
u8 buf_rx[2];
write16(client, reg, 0);
ret = spi_read(client, buf_rx, 2);
if (ret < 0)
return ret;
return (buf_rx[0] << 8) | buf_rx[1];
}
static int read24(void *client, u8 reg)
{
int ret;
u8 buf_rx[3];
write24(client, reg, 0);
ret = spi_read(client, buf_rx, 3);
if (ret < 0)
return ret;
return (buf_rx[1] << 8) | buf_rx[2];
}
static const struct ad_dpot_bus_ops bops = {
.read_d8 = read8,
.read_r8d8 = read16,
.read_r8d16 = read24,
.write_d8 = write8,
.write_r8d8 = write16,
.write_r8d16 = write24,
};
static const struct ad_dpot_id *dpot_match_id(const struct ad_dpot_id *id,
char *name)
{
while (id->name && id->name[0]) {
if (strcmp(name, id->name) == 0)
return id;
id++;
}
return NULL;
}
static int __devinit ad_dpot_spi_probe(struct spi_device *spi)
{
char *name = spi->dev.platform_data;
const struct ad_dpot_id *dpot_id;
struct ad_dpot_bus_data bdata = {
.client = spi,
.bops = &bops,
};
dpot_id = dpot_match_id(ad_dpot_spi_devlist, name);
if (dpot_id == NULL) {
dev_err(&spi->dev, "%s not in supported device list", name);
return -ENODEV;
}
return ad_dpot_probe(&spi->dev, &bdata, dpot_id);
}
static int __devexit ad_dpot_spi_remove(struct spi_device *spi)
{
return ad_dpot_remove(&spi->dev);
}
static struct spi_driver ad_dpot_spi_driver = {
.driver = {
.name = "ad_dpot",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ad_dpot_spi_probe,
.remove = __devexit_p(ad_dpot_spi_remove),
};
static int __init ad_dpot_spi_init(void)
{
return spi_register_driver(&ad_dpot_spi_driver);
}
module_init(ad_dpot_spi_init);
static void __exit ad_dpot_spi_exit(void)
{
spi_unregister_driver(&ad_dpot_spi_driver);
}
module_exit(ad_dpot_spi_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad_dpot");
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