Analog Devices ADG792A/G is a triple 4:1 mux. Signed-off-by: Peter Rosin <peda@xxxxxxxxxx> --- drivers/misc/Kconfig | 12 ++++ drivers/misc/Makefile | 1 + drivers/misc/mux-adg792a.c | 154 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 167 insertions(+) create mode 100644 drivers/misc/mux-adg792a.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 2ce675e410c5..45567a444bbf 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -780,6 +780,18 @@ menuconfig MULTIPLEXER if MULTIPLEXER +config MUX_ADG792A + tristate "Analog Devices ADG792A/ADG792G Multiplexers" + depends on I2C + help + ADG792A and ADG792G Wide Bandwidth Triple 4:1 Multiplexers + + The driver supports both operating the three multiplexers in + parellel and operating them independently. + + To compile the driver as a module, choose M here: the module will + be called mux-adg792a. + config MUX_GPIO tristate "GPIO-controlled Multiplexer" depends on OF && GPIOLIB diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 0befa2bba762..10ab8d34c9e5 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -54,6 +54,7 @@ obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o obj-$(CONFIG_CXL_BASE) += cxl/ obj-$(CONFIG_PANEL) += panel.o obj-$(CONFIG_MULTIPLEXER) += mux-core.o +obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o obj-$(CONFIG_MUX_GPIO) += mux-gpio.o lkdtm-$(CONFIG_LKDTM) += lkdtm_core.o diff --git a/drivers/misc/mux-adg792a.c b/drivers/misc/mux-adg792a.c new file mode 100644 index 000000000000..279dcf381695 --- /dev/null +++ b/drivers/misc/mux-adg792a.c @@ -0,0 +1,154 @@ +/* + * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux + * + * Copyright (C) 2016 Axentia Technologies AB + * + * Author: Peter Rosin <peda@xxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/mux.h> + +#define ADG792A_LDSW BIT(0) +#define ADG792A_RESET BIT(1) +#define ADG792A_DISABLE(mux) (0x50 | (mux)) +#define ADG792A_DISABLE_ALL (0x5f) +#define ADG792A_MUX(mux, state) (0xc0 | (((mux) + 1) << 2) | (state)) +#define ADG792A_MUX_ALL(state) (0xc0 | (state)) + +#define ADG792A_DISABLE_STATE (4) +#define ADG792A_KEEP_STATE (5) + +static int adg792a_set(struct mux_control *mux, int state) +{ + struct i2c_client *i2c = to_i2c_client(mux->chip->dev.parent); + u8 cmd; + + if (mux->chip->controllers == 1) { + /* parallel mux controller operation */ + if (state == ADG792A_DISABLE_STATE) + cmd = ADG792A_DISABLE_ALL; + else + cmd = ADG792A_MUX_ALL(state); + } else { + unsigned int controller = mux_control_get_index(mux); + + if (state == ADG792A_DISABLE_STATE) + cmd = ADG792A_DISABLE(controller); + else + cmd = ADG792A_MUX(controller, state); + } + + return i2c_smbus_write_byte_data(i2c, cmd, ADG792A_LDSW); +} + +static const struct mux_control_ops adg792a_ops = { + .set = adg792a_set, +}; + +static int adg792a_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct device *dev = &i2c->dev; + struct mux_chip *mux_chip; + bool parallel; + int ret; + int i; + + parallel = of_property_read_bool(i2c->dev.of_node, "adi,parallel"); + + mux_chip = mux_chip_alloc(dev, parallel ? 1 : 3, 0); + if (!mux_chip) + return -ENOMEM; + + mux_chip->ops = &adg792a_ops; + dev_set_drvdata(dev, mux_chip); + + ret = i2c_smbus_write_byte_data(i2c, ADG792A_DISABLE_ALL, + ADG792A_RESET | ADG792A_LDSW); + if (ret < 0) + goto free_mux_chip; + + for (i = 0; i < mux_chip->controllers; ++i) { + struct mux_control *mux = &mux_chip->mux[i]; + u32 idle_state; + + mux->states = 4; + + ret = of_property_read_u32_index(i2c->dev.of_node, + "adi,idle-state", i, + &idle_state); + if (ret >= 0) { + if (idle_state > ADG792A_KEEP_STATE) { + dev_err(dev, "invalid idle-state %u\n", + idle_state); + ret = -EINVAL; + goto free_mux_chip; + } + if (idle_state != ADG792A_KEEP_STATE) + mux->idle_state = idle_state; + } + } + + ret = mux_chip_register(mux_chip); + if (ret < 0) { + dev_err(dev, "failed to register mux-chip\n"); + goto free_mux_chip; + } + + if (parallel) + dev_info(dev, "1 triple 4-way mux-controller registered\n"); + else + dev_info(dev, "3 4-way mux-controllers registered\n"); + + return 0; + +free_mux_chip: + mux_chip_free(mux_chip); + return ret; +} + +static int adg792a_remove(struct i2c_client *i2c) +{ + struct mux_chip *mux_chip = to_mux_chip(&i2c->dev); + + mux_chip_unregister(mux_chip); + mux_chip_free(mux_chip); + + return 0; +} + +static const struct i2c_device_id adg792a_id[] = { + { .name = "adg792a", }, + { .name = "adg792g", }, + { } +}; +MODULE_DEVICE_TABLE(i2c, adg792a_id); + +static const struct of_device_id adg792a_of_match[] = { + { .compatible = "adi,adg792a", }, + { .compatible = "adi,adg792g", }, + { } +}; +MODULE_DEVICE_TABLE(of, adg792a_of_match); + +static struct i2c_driver adg792a_driver = { + .driver = { + .name = "adg792a", + .of_match_table = of_match_ptr(adg792a_of_match), + }, + .probe = adg792a_probe, + .remove = adg792a_remove, + .id_table = adg792a_id, +}; +module_i2c_driver(adg792a_driver); + +MODULE_DESCRIPTION("Analog Devices ADG792A/G Triple 4:1 mux driver"); +MODULE_AUTHOR("Peter Rosin <peda@xxxxxxxxxx"); +MODULE_LICENSE("GPL v2"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html