132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* ADGS1408/ADGS1409 SPI MUX driver
|
|
*
|
|
* Copyright 2018 Analog Devices Inc.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mux/driver.h>
|
|
#include <linux/property.h>
|
|
#include <linux/spi/spi.h>
|
|
|
|
#define ADGS1408_SW_DATA (0x01)
|
|
#define ADGS1408_REG_READ(reg) ((reg) | 0x80)
|
|
#define ADGS1408_DISABLE (0x00)
|
|
#define ADGS1408_MUX(state) (((state) << 1) | 1)
|
|
|
|
enum adgs1408_chip_id {
|
|
ADGS1408 = 1,
|
|
ADGS1409,
|
|
};
|
|
|
|
static int adgs1408_spi_reg_write(struct spi_device *spi,
|
|
u8 reg_addr, u8 reg_data)
|
|
{
|
|
u8 tx_buf[2];
|
|
|
|
tx_buf[0] = reg_addr;
|
|
tx_buf[1] = reg_data;
|
|
|
|
return spi_write_then_read(spi, tx_buf, sizeof(tx_buf), NULL, 0);
|
|
}
|
|
|
|
static int adgs1408_set(struct mux_control *mux, int state)
|
|
{
|
|
struct spi_device *spi = to_spi_device(mux->chip->dev.parent);
|
|
u8 reg;
|
|
|
|
if (state == MUX_IDLE_DISCONNECT)
|
|
reg = ADGS1408_DISABLE;
|
|
else
|
|
reg = ADGS1408_MUX(state);
|
|
|
|
return adgs1408_spi_reg_write(spi, ADGS1408_SW_DATA, reg);
|
|
}
|
|
|
|
static const struct mux_control_ops adgs1408_ops = {
|
|
.set = adgs1408_set,
|
|
};
|
|
|
|
static int adgs1408_probe(struct spi_device *spi)
|
|
{
|
|
struct device *dev = &spi->dev;
|
|
enum adgs1408_chip_id chip_id;
|
|
struct mux_chip *mux_chip;
|
|
struct mux_control *mux;
|
|
s32 idle_state;
|
|
int ret;
|
|
|
|
chip_id = (enum adgs1408_chip_id)device_get_match_data(dev);
|
|
if (!chip_id)
|
|
chip_id = spi_get_device_id(spi)->driver_data;
|
|
|
|
mux_chip = devm_mux_chip_alloc(dev, 1, 0);
|
|
if (IS_ERR(mux_chip))
|
|
return PTR_ERR(mux_chip);
|
|
|
|
mux_chip->ops = &adgs1408_ops;
|
|
|
|
ret = adgs1408_spi_reg_write(spi, ADGS1408_SW_DATA, ADGS1408_DISABLE);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
|
|
if (ret < 0)
|
|
idle_state = MUX_IDLE_AS_IS;
|
|
|
|
mux = mux_chip->mux;
|
|
|
|
if (chip_id == ADGS1408)
|
|
mux->states = 8;
|
|
else
|
|
mux->states = 4;
|
|
|
|
switch (idle_state) {
|
|
case MUX_IDLE_DISCONNECT:
|
|
case MUX_IDLE_AS_IS:
|
|
case 0 ... 7:
|
|
/* adgs1409 supports only 4 states */
|
|
if (idle_state < mux->states) {
|
|
mux->idle_state = idle_state;
|
|
break;
|
|
}
|
|
/* fall through */
|
|
default:
|
|
dev_err(dev, "invalid idle-state %d\n", idle_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return devm_mux_chip_register(dev, mux_chip);
|
|
}
|
|
|
|
static const struct spi_device_id adgs1408_spi_id[] = {
|
|
{ "adgs1408", ADGS1408 },
|
|
{ "adgs1409", ADGS1409 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, adgs1408_spi_id);
|
|
|
|
static const struct of_device_id adgs1408_of_match[] = {
|
|
{ .compatible = "adi,adgs1408", .data = (void *)ADGS1408, },
|
|
{ .compatible = "adi,adgs1409", .data = (void *)ADGS1409, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, adgs1408_of_match);
|
|
|
|
static struct spi_driver adgs1408_driver = {
|
|
.driver = {
|
|
.name = "adgs1408",
|
|
.of_match_table = adgs1408_of_match,
|
|
},
|
|
.probe = adgs1408_probe,
|
|
.id_table = adgs1408_spi_id,
|
|
};
|
|
module_spi_driver(adgs1408_driver);
|
|
|
|
MODULE_AUTHOR("Mircea Caprioru <mircea.caprioru@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices ADGS1408 MUX driver");
|
|
MODULE_LICENSE("GPL");
|