| Message ID | 1483532187-28494-13-git-send-email-peda@axentia.se |
|---|---|
| State | Awaiting Upstream |
| Headers | show |
On 04/01/17 12:16, Peter Rosin wrote: > Analog Devices ADG792A/G is a triple 4:1 mux. > > Signed-off-by: Peter Rosin <peda@axentia.se> Reviewed-by: Jonathan Cameron <jic23@kernel.org> A nice little driver. Hopefully this example will do the job of convincing people a subsystem makes sense! Jonathan > --- > drivers/mux/Kconfig | 12 ++++ > drivers/mux/Makefile | 1 + > drivers/mux/mux-adg792a.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 182 insertions(+) > create mode 100644 drivers/mux/mux-adg792a.c > > diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig > index de5a35ffe7af..39b06e19aa96 100644 > --- a/drivers/mux/Kconfig > +++ b/drivers/mux/Kconfig > @@ -16,6 +16,18 @@ 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 > + parallel 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/mux/Makefile b/drivers/mux/Makefile > index facc43da3648..fddbb073fc77 100644 > --- a/drivers/mux/Makefile > +++ b/drivers/mux/Makefile > @@ -3,4 +3,5 @@ > # > > obj-$(CONFIG_MULTIPLEXER) += mux-core.o > +obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o > obj-$(CONFIG_MUX_GPIO) += mux-gpio.o > diff --git a/drivers/mux/mux-adg792a.c b/drivers/mux/mux-adg792a.c > new file mode 100644 > index 000000000000..c6d5c4571e7c > --- /dev/null > +++ b/drivers/mux/mux-adg792a.c > @@ -0,0 +1,169 @@ > +/* > + * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux > + * > + * Copyright (C) 2016 Axentia Technologies AB > + * > + * Author: Peter Rosin <peda@axentia.se> > + * > + * 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) > + > +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 count; > + int ret; > + int i; > + > + parallel = of_property_read_bool(i2c->dev.of_node, "adi,parallel"); > + > + mux_chip = devm_mux_chip_alloc(dev, parallel ? 1 : 3, 0); > + if (!mux_chip) > + return -ENOMEM; > + > + mux_chip->ops = &adg792a_ops; > + > + ret = i2c_smbus_write_byte_data(i2c, ADG792A_DISABLE_ALL, > + ADG792A_RESET | ADG792A_LDSW); > + if (ret < 0) > + return ret; > + > + for (i = 0; i < mux_chip->controllers; ++i) { > + struct mux_control *mux = &mux_chip->mux[i]; > + > + mux->states = 4; > + } > + > + count = of_property_count_u32_elems(dev->of_node, "adi,idle-state"); > + for (i = 0; i < count; i += 2) { > + u32 index; > + u32 idle_state; > + > + ret = of_property_read_u32_index(dev->of_node, > + "adi,idle-state", i, > + &index); > + if (ret < 0) > + return ret; > + if (index >= mux_chip->controllers) { > + dev_err(dev, "invalid mux %u\n", index); > + return -EINVAL; > + } > + > + ret = of_property_read_u32_index(dev->of_node, > + "adi,idle-state", i + 1, > + &idle_state); > + if (ret < 0) > + return ret; > + if (idle_state >= ADG792A_DISABLE_STATE) { > + dev_err(dev, "invalid idle-state %u for mux %u\n", > + idle_state, index); > + return -EINVAL; > + } > + mux_chip->mux[index].idle_state = idle_state; > + } > + > + count = of_property_count_u32_elems(dev->of_node, > + "adi,idle-high-impedance"); > + for (i = 0; i < count; ++i) { > + u32 index; > + > + ret = of_property_read_u32_index(dev->of_node, > + "adi,idle-high-impedance", i, > + &index); > + if (ret < 0) > + return ret; > + if (index >= mux_chip->controllers) { > + dev_err(dev, "invalid mux %u\n", index); > + return -EINVAL; > + } > + > + mux_chip->mux[index].idle_state = ADG792A_DISABLE_STATE; > + } > + > + ret = devm_mux_chip_register(dev, mux_chip); > + if (ret < 0) { > + dev_err(dev, "failed to register mux-chip\n"); > + return ret; > + } > + > + if (parallel) > + dev_info(dev, "triple pole quadruple throw mux registered\n"); > + else > + dev_info(dev, "3x single pole quadruple throw muxes registered\n"); > + > + 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, > + .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@axentia.se"); > +MODULE_LICENSE("GPL v2"); > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig index de5a35ffe7af..39b06e19aa96 100644 --- a/drivers/mux/Kconfig +++ b/drivers/mux/Kconfig @@ -16,6 +16,18 @@ 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 + parallel 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/mux/Makefile b/drivers/mux/Makefile index facc43da3648..fddbb073fc77 100644 --- a/drivers/mux/Makefile +++ b/drivers/mux/Makefile @@ -3,4 +3,5 @@ # obj-$(CONFIG_MULTIPLEXER) += mux-core.o +obj-$(CONFIG_MUX_ADG792A) += mux-adg792a.o obj-$(CONFIG_MUX_GPIO) += mux-gpio.o diff --git a/drivers/mux/mux-adg792a.c b/drivers/mux/mux-adg792a.c new file mode 100644 index 000000000000..c6d5c4571e7c --- /dev/null +++ b/drivers/mux/mux-adg792a.c @@ -0,0 +1,169 @@ +/* + * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux + * + * Copyright (C) 2016 Axentia Technologies AB + * + * Author: Peter Rosin <peda@axentia.se> + * + * 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) + +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 count; + int ret; + int i; + + parallel = of_property_read_bool(i2c->dev.of_node, "adi,parallel"); + + mux_chip = devm_mux_chip_alloc(dev, parallel ? 1 : 3, 0); + if (!mux_chip) + return -ENOMEM; + + mux_chip->ops = &adg792a_ops; + + ret = i2c_smbus_write_byte_data(i2c, ADG792A_DISABLE_ALL, + ADG792A_RESET | ADG792A_LDSW); + if (ret < 0) + return ret; + + for (i = 0; i < mux_chip->controllers; ++i) { + struct mux_control *mux = &mux_chip->mux[i]; + + mux->states = 4; + } + + count = of_property_count_u32_elems(dev->of_node, "adi,idle-state"); + for (i = 0; i < count; i += 2) { + u32 index; + u32 idle_state; + + ret = of_property_read_u32_index(dev->of_node, + "adi,idle-state", i, + &index); + if (ret < 0) + return ret; + if (index >= mux_chip->controllers) { + dev_err(dev, "invalid mux %u\n", index); + return -EINVAL; + } + + ret = of_property_read_u32_index(dev->of_node, + "adi,idle-state", i + 1, + &idle_state); + if (ret < 0) + return ret; + if (idle_state >= ADG792A_DISABLE_STATE) { + dev_err(dev, "invalid idle-state %u for mux %u\n", + idle_state, index); + return -EINVAL; + } + mux_chip->mux[index].idle_state = idle_state; + } + + count = of_property_count_u32_elems(dev->of_node, + "adi,idle-high-impedance"); + for (i = 0; i < count; ++i) { + u32 index; + + ret = of_property_read_u32_index(dev->of_node, + "adi,idle-high-impedance", i, + &index); + if (ret < 0) + return ret; + if (index >= mux_chip->controllers) { + dev_err(dev, "invalid mux %u\n", index); + return -EINVAL; + } + + mux_chip->mux[index].idle_state = ADG792A_DISABLE_STATE; + } + + ret = devm_mux_chip_register(dev, mux_chip); + if (ret < 0) { + dev_err(dev, "failed to register mux-chip\n"); + return ret; + } + + if (parallel) + dev_info(dev, "triple pole quadruple throw mux registered\n"); + else + dev_info(dev, "3x single pole quadruple throw muxes registered\n"); + + 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, + .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@axentia.se"); +MODULE_LICENSE("GPL v2");
Analog Devices ADG792A/G is a triple 4:1 mux. Signed-off-by: Peter Rosin <peda@axentia.se> --- drivers/mux/Kconfig | 12 ++++ drivers/mux/Makefile | 1 + drivers/mux/mux-adg792a.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 182 insertions(+) create mode 100644 drivers/mux/mux-adg792a.c