1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * ADGS1408/ADGS1409 SPI MUX driver
11 #include <linux/mux/driver.h>
13 #include <linux/spi/spi.h>
25 static int adgs1408_spi_reg_write(struct spi_device *spi,  in adgs1408_spi_reg_write()  argument
33 	return spi_write_then_read(spi, tx_buf, sizeof(tx_buf), NULL, 0);  in adgs1408_spi_reg_write()
36 static int adgs1408_set(struct mux_control *mux, int state)  in adgs1408_set()  argument
38 	struct spi_device *spi = to_spi_device(mux->chip->dev.parent);  in adgs1408_set()  local
46 	return adgs1408_spi_reg_write(spi, ADGS1408_SW_DATA, reg);  in adgs1408_set()
53 static int adgs1408_probe(struct spi_device *spi)  in adgs1408_probe()  argument
55 	struct device *dev = &spi->dev;  in adgs1408_probe()
58 	struct mux_control *mux;  in adgs1408_probe()  local
62 	chip_id = (kernel_ulong_t)spi_get_device_match_data(spi);  in adgs1408_probe()
68 	mux_chip->ops = &adgs1408_ops;  in adgs1408_probe()
70 	ret = adgs1408_spi_reg_write(spi, ADGS1408_SW_DATA, ADGS1408_DISABLE);  in adgs1408_probe()
74 	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);  in adgs1408_probe()
78 	mux = mux_chip->mux;  in adgs1408_probe()
81 		mux->states = 8;  in adgs1408_probe()
83 		mux->states = 4;  in adgs1408_probe()
90 		if (idle_state < mux->states) {  in adgs1408_probe()
91 			mux->idle_state = idle_state;  in adgs1408_probe()
96 		dev_err(dev, "invalid idle-state %d\n", idle_state);  in adgs1408_probe()
97 		return -EINVAL;  in adgs1408_probe()
108 MODULE_DEVICE_TABLE(spi, adgs1408_spi_id);
128 MODULE_DESCRIPTION("Analog Devices ADGS1408 MUX driver");