mux: adgs1408: new driver for Analog Devices ADGS1408/1409 mux (8b9ce695) · Commits · 戴 / test

drivers/mux/Kconfig

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Original line number	Diff line number	Diff line
		@@ -21,6 +21,16 @@ config MUX_ADG792A
		To compile the driver as a module, choose M here: the module will
		be called mux-adg792a.

		config MUX_ADGS1408
		tristate "Analog Devices ADGS1408/ADGS1409 Multiplexers"
		depends on SPI
		help
		ADGS1408 8:1 multiplexer and ADGS1409 double 4:1 multiplexer
		switches.

		To compile the driver as a module, choose M here: the module will
		be called mux-adgs1408.

		config MUX_GPIO
		tristate "GPIO-controlled Multiplexer"
		depends on GPIOLIB \|\| COMPILE_TEST

drivers/mux/Makefile

+2 −0

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		@@ -5,10 +5,12 @@

		mux-core-objs := core.o
		mux-adg792a-objs := adg792a.o
		mux-adgs1408-objs := adgs1408.o
		mux-gpio-objs := gpio.o
		mux-mmio-objs := mmio.o

		obj-$(CONFIG_MULTIPLEXER) += mux-core.o
		obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o
		obj-$(CONFIG_MUX_ADGS1408) += mux-adgs1408.o
		obj-$(CONFIG_MUX_GPIO) += mux-gpio.o
		obj-$(CONFIG_MUX_MMIO) += mux-mmio.o

drivers/mux/adgs1408.c

0 → 100644

+131 −0

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		// SPDX-License-Identifier: GPL-2.0-or-later
		/*
		* ADGS1408/ADGS1409 SPI MUX driver
		*
		* Copyright 2018 Analog Devices Inc.
		*/

		#include <linux/err.h>
		#include <linux/module.h>
		#include <linux/mux/driver.h>
		#include <linux/of_platform.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)of_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 = of_match_ptr(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 v2");

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