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