mux: gpio: add mux controller driver for gpio based multiplexers

The driver builds a single multiplexer controller using a number
of gpio pins. For N pins, there will be 2^N possible multiplexer
states. The GPIO pins can be connected (by the hardware) to several
multiplexers, which in that case will be operated in parallel.

Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
index 23ab2cde83b1e7c3306790f0a5ccbf33ed9ed63d..738670aaecb7243c9c73fde1677ba90eb664276d 100644 (file)
--- a/drivers/mux/Kconfig
+++ b/drivers/mux/Kconfig
@@ -14,3 +14,21 @@ menuconfig MULTIPLEXER
 
          To compile the subsystem as a module, choose M here: the module will
          be called mux-core.
+
+if MULTIPLEXER
+
+config MUX_GPIO
+       tristate "GPIO-controlled Multiplexer"
+       depends on GPIOLIB || COMPILE_TEST
+       help
+         GPIO-controlled Multiplexer controller.
+
+         The driver builds a single multiplexer controller using a number
+         of gpio pins. For N pins, there will be 2^N possible multiplexer
+         states. The GPIO pins can be connected (by the hardware) to several
+         multiplexers, which in that case will be operated in parallel.
+
+         To compile the driver as a module, choose M here: the module will
+         be called mux-gpio.
+
+endif

diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile
index 09f0299e109da3d64a5e819db07a096da20937c2..bb16953f6290fb782bf90992ea7fa12968cfe4f3 100644 (file)
--- a/drivers/mux/Makefile
+++ b/drivers/mux/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_MULTIPLEXER)      += mux-core.o
+obj-$(CONFIG_MUX_GPIO)         += mux-gpio.o

diff --git a/drivers/mux/mux-gpio.c b/drivers/mux/mux-gpio.c
new file mode 100644 (file)
index 0000000..468bf17
--- /dev/null
+++ b/drivers/mux/mux-gpio.c
@@ -0,0 +1,114 @@
+/*
+ * GPIO-controlled multiplexer driver
+ *
+ * Copyright (C) 2017 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/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/mux/driver.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+struct mux_gpio {
+       struct gpio_descs *gpios;
+       int *val;
+};
+
+static int mux_gpio_set(struct mux_control *mux, int state)
+{
+       struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
+       int i;
+
+       for (i = 0; i < mux_gpio->gpios->ndescs; i++)
+               mux_gpio->val[i] = (state >> i) & 1;
+
+       gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
+                                      mux_gpio->gpios->desc,
+                                      mux_gpio->val);
+
+       return 0;
+}
+
+static const struct mux_control_ops mux_gpio_ops = {
+       .set = mux_gpio_set,
+};
+
+static const struct of_device_id mux_gpio_dt_ids[] = {
+       { .compatible = "gpio-mux", },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mux_gpio_dt_ids);
+
+static int mux_gpio_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct mux_chip *mux_chip;
+       struct mux_gpio *mux_gpio;
+       int pins;
+       s32 idle_state;
+       int ret;
+
+       pins = gpiod_count(dev, "mux");
+       if (pins < 0)
+               return pins;
+
+       mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio) +
+                                      pins * sizeof(*mux_gpio->val));
+       if (IS_ERR(mux_chip))
+               return PTR_ERR(mux_chip);
+
+       mux_gpio = mux_chip_priv(mux_chip);
+       mux_gpio->val = (int *)(mux_gpio + 1);
+       mux_chip->ops = &mux_gpio_ops;
+
+       mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
+       if (IS_ERR(mux_gpio->gpios)) {
+               ret = PTR_ERR(mux_gpio->gpios);
+               if (ret != -EPROBE_DEFER)
+                       dev_err(dev, "failed to get gpios\n");
+               return ret;
+       }
+       WARN_ON(pins != mux_gpio->gpios->ndescs);
+       mux_chip->mux->states = 1 << pins;
+
+       ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
+       if (ret >= 0 && idle_state != MUX_IDLE_AS_IS) {
+               if (idle_state < 0 || idle_state >= mux_chip->mux->states) {
+                       dev_err(dev, "invalid idle-state %u\n", idle_state);
+                       return -EINVAL;
+               }
+
+               mux_chip->mux->idle_state = idle_state;
+       }
+
+       ret = devm_mux_chip_register(dev, mux_chip);
+       if (ret < 0)
+               return ret;
+
+       dev_info(dev, "%u-way mux-controller registered\n",
+                mux_chip->mux->states);
+
+       return 0;
+}
+
+static struct platform_driver mux_gpio_driver = {
+       .driver = {
+               .name = "gpio-mux",
+               .of_match_table = of_match_ptr(mux_gpio_dt_ids),
+       },
+       .probe = mux_gpio_probe,
+};
+module_platform_driver(mux_gpio_driver);
+
+MODULE_DESCRIPTION("GPIO-controlled multiplexer driver");
+MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
+MODULE_LICENSE("GPL v2");