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131 lines
2.9 KiB
131 lines
2.9 KiB
// 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/mod_devicetable.h> |
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#include <linux/module.h> |
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#include <linux/mux/driver.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)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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fallthrough; |
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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 = 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 <[email protected]>"); |
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MODULE_DESCRIPTION("Analog Devices ADGS1408 MUX driver"); |
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MODULE_LICENSE("GPL");
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