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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/mux/adgs1408.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mux/adgs1408.c')
-rw-r--r-- | drivers/mux/adgs1408.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/mux/adgs1408.c b/drivers/mux/adgs1408.c new file mode 100644 index 000000000..22ed051eb --- /dev/null +++ b/drivers/mux/adgs1408.c @@ -0,0 +1,131 @@ +// 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; + } + fallthrough; + 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"); |