Preserve the module names with Makefile additions.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# Makefile for multiplexer devices.
#
+mux-core-objs := core.o
+mux-adg792a-objs := adg792a.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_GPIO) += mux-gpio.o
--- /dev/null
+/*
+ * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux
+ *
+ * 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/i2c.h>
+#include <linux/module.h>
+#include <linux/mux/driver.h>
+#include <linux/property.h>
+
+#define ADG792A_LDSW BIT(0)
+#define ADG792A_RESETB 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))
+
+static int adg792a_write_cmd(struct i2c_client *i2c, u8 cmd, int reset)
+{
+ u8 data = ADG792A_RESETB | ADG792A_LDSW;
+
+ /* ADG792A_RESETB is active low, the chip resets when it is zero. */
+ if (reset)
+ data &= ~ADG792A_RESETB;
+
+ return i2c_smbus_write_byte_data(i2c, cmd, data);
+}
+
+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 == MUX_IDLE_DISCONNECT)
+ cmd = ADG792A_DISABLE_ALL;
+ else
+ cmd = ADG792A_MUX_ALL(state);
+ } else {
+ unsigned int controller = mux_control_get_index(mux);
+
+ if (state == MUX_IDLE_DISCONNECT)
+ cmd = ADG792A_DISABLE(controller);
+ else
+ cmd = ADG792A_MUX(controller, state);
+ }
+
+ return adg792a_write_cmd(i2c, cmd, 0);
+}
+
+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;
+ s32 idle_state[3];
+ u32 cells;
+ int ret;
+ int i;
+
+ if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ ret = device_property_read_u32(dev, "#mux-control-cells", &cells);
+ if (ret < 0)
+ return ret;
+ if (cells >= 2)
+ return -EINVAL;
+
+ mux_chip = devm_mux_chip_alloc(dev, cells ? 3 : 1, 0);
+ if (IS_ERR(mux_chip))
+ return PTR_ERR(mux_chip);
+
+ mux_chip->ops = &adg792a_ops;
+
+ ret = adg792a_write_cmd(i2c, ADG792A_DISABLE_ALL, 1);
+ if (ret < 0)
+ return ret;
+
+ ret = device_property_read_u32_array(dev, "idle-state",
+ (u32 *)idle_state,
+ mux_chip->controllers);
+ if (ret < 0) {
+ idle_state[0] = MUX_IDLE_AS_IS;
+ idle_state[1] = MUX_IDLE_AS_IS;
+ idle_state[2] = MUX_IDLE_AS_IS;
+ }
+
+ for (i = 0; i < mux_chip->controllers; ++i) {
+ struct mux_control *mux = &mux_chip->mux[i];
+
+ mux->states = 4;
+
+ switch (idle_state[i]) {
+ case MUX_IDLE_DISCONNECT:
+ case MUX_IDLE_AS_IS:
+ case 0 ... 4:
+ mux->idle_state = idle_state[i];
+ break;
+ default:
+ dev_err(dev, "invalid idle-state %d\n", idle_state[i]);
+ return -EINVAL;
+ }
+ }
+
+ ret = devm_mux_chip_register(dev, mux_chip);
+ if (ret < 0)
+ return ret;
+
+ if (cells)
+ dev_info(dev, "3x single pole quadruple throw muxes registered\n");
+ else
+ dev_info(dev, "triple pole quadruple throw mux 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");
--- /dev/null
+/*
+ * Multiplexer subsystem
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) "mux-core: " fmt
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/idr.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mux/consumer.h>
+#include <linux/mux/driver.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+
+/*
+ * The idle-as-is "state" is not an actual state that may be selected, it
+ * only implies that the state should not be changed. So, use that state
+ * as indication that the cached state of the multiplexer is unknown.
+ */
+#define MUX_CACHE_UNKNOWN MUX_IDLE_AS_IS
+
+static struct class mux_class = {
+ .name = "mux",
+ .owner = THIS_MODULE,
+};
+
+static DEFINE_IDA(mux_ida);
+
+static int __init mux_init(void)
+{
+ ida_init(&mux_ida);
+ return class_register(&mux_class);
+}
+
+static void __exit mux_exit(void)
+{
+ class_unregister(&mux_class);
+ ida_destroy(&mux_ida);
+}
+
+static void mux_chip_release(struct device *dev)
+{
+ struct mux_chip *mux_chip = to_mux_chip(dev);
+
+ ida_simple_remove(&mux_ida, mux_chip->id);
+ kfree(mux_chip);
+}
+
+static struct device_type mux_type = {
+ .name = "mux-chip",
+ .release = mux_chip_release,
+};
+
+/**
+ * mux_chip_alloc() - Allocate a mux-chip.
+ * @dev: The parent device implementing the mux interface.
+ * @controllers: The number of mux controllers to allocate for this chip.
+ * @sizeof_priv: Size of extra memory area for private use by the caller.
+ *
+ * After allocating the mux-chip with the desired number of mux controllers
+ * but before registering the chip, the mux driver is required to configure
+ * the number of valid mux states in the mux_chip->mux[N].states members and
+ * the desired idle state in the returned mux_chip->mux[N].idle_state members.
+ * The default idle state is MUX_IDLE_AS_IS. The mux driver also needs to
+ * provide a pointer to the operations struct in the mux_chip->ops member
+ * before registering the mux-chip with mux_chip_register.
+ *
+ * Return: A pointer to the new mux-chip, or an ERR_PTR with a negative errno.
+ */
+struct mux_chip *mux_chip_alloc(struct device *dev,
+ unsigned int controllers, size_t sizeof_priv)
+{
+ struct mux_chip *mux_chip;
+ int i;
+
+ if (WARN_ON(!dev || !controllers))
+ return ERR_PTR(-EINVAL);
+
+ mux_chip = kzalloc(sizeof(*mux_chip) +
+ controllers * sizeof(*mux_chip->mux) +
+ sizeof_priv, GFP_KERNEL);
+ if (!mux_chip)
+ return ERR_PTR(-ENOMEM);
+
+ mux_chip->mux = (struct mux_control *)(mux_chip + 1);
+ mux_chip->dev.class = &mux_class;
+ mux_chip->dev.type = &mux_type;
+ mux_chip->dev.parent = dev;
+ mux_chip->dev.of_node = dev->of_node;
+ dev_set_drvdata(&mux_chip->dev, mux_chip);
+
+ mux_chip->id = ida_simple_get(&mux_ida, 0, 0, GFP_KERNEL);
+ if (mux_chip->id < 0) {
+ int err = mux_chip->id;
+
+ pr_err("muxchipX failed to get a device id\n");
+ kfree(mux_chip);
+ return ERR_PTR(err);
+ }
+ dev_set_name(&mux_chip->dev, "muxchip%d", mux_chip->id);
+
+ mux_chip->controllers = controllers;
+ for (i = 0; i < controllers; ++i) {
+ struct mux_control *mux = &mux_chip->mux[i];
+
+ mux->chip = mux_chip;
+ sema_init(&mux->lock, 1);
+ mux->cached_state = MUX_CACHE_UNKNOWN;
+ mux->idle_state = MUX_IDLE_AS_IS;
+ }
+
+ device_initialize(&mux_chip->dev);
+
+ return mux_chip;
+}
+EXPORT_SYMBOL_GPL(mux_chip_alloc);
+
+static int mux_control_set(struct mux_control *mux, int state)
+{
+ int ret = mux->chip->ops->set(mux, state);
+
+ mux->cached_state = ret < 0 ? MUX_CACHE_UNKNOWN : state;
+
+ return ret;
+}
+
+/**
+ * mux_chip_register() - Register a mux-chip, thus readying the controllers
+ * for use.
+ * @mux_chip: The mux-chip to register.
+ *
+ * Do not retry registration of the same mux-chip on failure. You should
+ * instead put it away with mux_chip_free() and allocate a new one, if you
+ * for some reason would like to retry registration.
+ *
+ * Return: Zero on success or a negative errno on error.
+ */
+int mux_chip_register(struct mux_chip *mux_chip)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < mux_chip->controllers; ++i) {
+ struct mux_control *mux = &mux_chip->mux[i];
+
+ if (mux->idle_state == mux->cached_state)
+ continue;
+
+ ret = mux_control_set(mux, mux->idle_state);
+ if (ret < 0) {
+ dev_err(&mux_chip->dev, "unable to set idle state\n");
+ return ret;
+ }
+ }
+
+ ret = device_add(&mux_chip->dev);
+ if (ret < 0)
+ dev_err(&mux_chip->dev,
+ "device_add failed in %s: %d\n", __func__, ret);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mux_chip_register);
+
+/**
+ * mux_chip_unregister() - Take the mux-chip off-line.
+ * @mux_chip: The mux-chip to unregister.
+ *
+ * mux_chip_unregister() reverses the effects of mux_chip_register().
+ * But not completely, you should not try to call mux_chip_register()
+ * on a mux-chip that has been registered before.
+ */
+void mux_chip_unregister(struct mux_chip *mux_chip)
+{
+ device_del(&mux_chip->dev);
+}
+EXPORT_SYMBOL_GPL(mux_chip_unregister);
+
+/**
+ * mux_chip_free() - Free the mux-chip for good.
+ * @mux_chip: The mux-chip to free.
+ *
+ * mux_chip_free() reverses the effects of mux_chip_alloc().
+ */
+void mux_chip_free(struct mux_chip *mux_chip)
+{
+ if (!mux_chip)
+ return;
+
+ put_device(&mux_chip->dev);
+}
+EXPORT_SYMBOL_GPL(mux_chip_free);
+
+static void devm_mux_chip_release(struct device *dev, void *res)
+{
+ struct mux_chip *mux_chip = *(struct mux_chip **)res;
+
+ mux_chip_free(mux_chip);
+}
+
+/**
+ * devm_mux_chip_alloc() - Resource-managed version of mux_chip_alloc().
+ * @dev: The parent device implementing the mux interface.
+ * @controllers: The number of mux controllers to allocate for this chip.
+ * @sizeof_priv: Size of extra memory area for private use by the caller.
+ *
+ * See mux_chip_alloc() for more details.
+ *
+ * Return: A pointer to the new mux-chip, or an ERR_PTR with a negative errno.
+ */
+struct mux_chip *devm_mux_chip_alloc(struct device *dev,
+ unsigned int controllers,
+ size_t sizeof_priv)
+{
+ struct mux_chip **ptr, *mux_chip;
+
+ ptr = devres_alloc(devm_mux_chip_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ mux_chip = mux_chip_alloc(dev, controllers, sizeof_priv);
+ if (IS_ERR(mux_chip)) {
+ devres_free(ptr);
+ return mux_chip;
+ }
+
+ *ptr = mux_chip;
+ devres_add(dev, ptr);
+
+ return mux_chip;
+}
+EXPORT_SYMBOL_GPL(devm_mux_chip_alloc);
+
+static void devm_mux_chip_reg_release(struct device *dev, void *res)
+{
+ struct mux_chip *mux_chip = *(struct mux_chip **)res;
+
+ mux_chip_unregister(mux_chip);
+}
+
+/**
+ * devm_mux_chip_register() - Resource-managed version mux_chip_register().
+ * @dev: The parent device implementing the mux interface.
+ * @mux_chip: The mux-chip to register.
+ *
+ * See mux_chip_register() for more details.
+ *
+ * Return: Zero on success or a negative errno on error.
+ */
+int devm_mux_chip_register(struct device *dev,
+ struct mux_chip *mux_chip)
+{
+ struct mux_chip **ptr;
+ int res;
+
+ ptr = devres_alloc(devm_mux_chip_reg_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ res = mux_chip_register(mux_chip);
+ if (res) {
+ devres_free(ptr);
+ return res;
+ }
+
+ *ptr = mux_chip;
+ devres_add(dev, ptr);
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(devm_mux_chip_register);
+
+/**
+ * mux_control_states() - Query the number of multiplexer states.
+ * @mux: The mux-control to query.
+ *
+ * Return: The number of multiplexer states.
+ */
+unsigned int mux_control_states(struct mux_control *mux)
+{
+ return mux->states;
+}
+EXPORT_SYMBOL_GPL(mux_control_states);
+
+/*
+ * The mux->lock must be down when calling this function.
+ */
+static int __mux_control_select(struct mux_control *mux, int state)
+{
+ int ret;
+
+ if (WARN_ON(state < 0 || state >= mux->states))
+ return -EINVAL;
+
+ if (mux->cached_state == state)
+ return 0;
+
+ ret = mux_control_set(mux, state);
+ if (ret >= 0)
+ return 0;
+
+ /* The mux update failed, try to revert if appropriate... */
+ if (mux->idle_state != MUX_IDLE_AS_IS)
+ mux_control_set(mux, mux->idle_state);
+
+ return ret;
+}
+
+/**
+ * mux_control_select() - Select the given multiplexer state.
+ * @mux: The mux-control to request a change of state from.
+ * @state: The new requested state.
+ *
+ * On successfully selecting the mux-control state, it will be locked until
+ * there is a call to mux_control_deselect(). If the mux-control is already
+ * selected when mux_control_select() is called, the caller will be blocked
+ * until mux_control_deselect() is called (by someone else).
+ *
+ * Therefore, make sure to call mux_control_deselect() when the operation is
+ * complete and the mux-control is free for others to use, but do not call
+ * mux_control_deselect() if mux_control_select() fails.
+ *
+ * Return: 0 when the mux-control state has the requested state or a negative
+ * errno on error.
+ */
+int mux_control_select(struct mux_control *mux, unsigned int state)
+{
+ int ret;
+
+ ret = down_killable(&mux->lock);
+ if (ret < 0)
+ return ret;
+
+ ret = __mux_control_select(mux, state);
+
+ if (ret < 0)
+ up(&mux->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mux_control_select);
+
+/**
+ * mux_control_try_select() - Try to select the given multiplexer state.
+ * @mux: The mux-control to request a change of state from.
+ * @state: The new requested state.
+ *
+ * On successfully selecting the mux-control state, it will be locked until
+ * mux_control_deselect() called.
+ *
+ * Therefore, make sure to call mux_control_deselect() when the operation is
+ * complete and the mux-control is free for others to use, but do not call
+ * mux_control_deselect() if mux_control_try_select() fails.
+ *
+ * Return: 0 when the mux-control state has the requested state or a negative
+ * errno on error. Specifically -EBUSY if the mux-control is contended.
+ */
+int mux_control_try_select(struct mux_control *mux, unsigned int state)
+{
+ int ret;
+
+ if (down_trylock(&mux->lock))
+ return -EBUSY;
+
+ ret = __mux_control_select(mux, state);
+
+ if (ret < 0)
+ up(&mux->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mux_control_try_select);
+
+/**
+ * mux_control_deselect() - Deselect the previously selected multiplexer state.
+ * @mux: The mux-control to deselect.
+ *
+ * It is required that a single call is made to mux_control_deselect() for
+ * each and every successful call made to either of mux_control_select() or
+ * mux_control_try_select().
+ *
+ * Return: 0 on success and a negative errno on error. An error can only
+ * occur if the mux has an idle state. Note that even if an error occurs, the
+ * mux-control is unlocked and is thus free for the next access.
+ */
+int mux_control_deselect(struct mux_control *mux)
+{
+ int ret = 0;
+
+ if (mux->idle_state != MUX_IDLE_AS_IS &&
+ mux->idle_state != mux->cached_state)
+ ret = mux_control_set(mux, mux->idle_state);
+
+ up(&mux->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mux_control_deselect);
+
+static int of_dev_node_match(struct device *dev, const void *data)
+{
+ return dev->of_node == data;
+}
+
+static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
+{
+ struct device *dev;
+
+ dev = class_find_device(&mux_class, NULL, np, of_dev_node_match);
+
+ return dev ? to_mux_chip(dev) : NULL;
+}
+
+/**
+ * mux_control_get() - Get the mux-control for a device.
+ * @dev: The device that needs a mux-control.
+ * @mux_name: The name identifying the mux-control.
+ *
+ * Return: A pointer to the mux-control, or an ERR_PTR with a negative errno.
+ */
+struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
+{
+ struct device_node *np = dev->of_node;
+ struct of_phandle_args args;
+ struct mux_chip *mux_chip;
+ unsigned int controller;
+ int index = 0;
+ int ret;
+
+ if (mux_name) {
+ index = of_property_match_string(np, "mux-control-names",
+ mux_name);
+ if (index < 0) {
+ dev_err(dev, "mux controller '%s' not found\n",
+ mux_name);
+ return ERR_PTR(index);
+ }
+ }
+
+ ret = of_parse_phandle_with_args(np,
+ "mux-controls", "#mux-control-cells",
+ index, &args);
+ if (ret) {
+ dev_err(dev, "%pOF: failed to get mux-control %s(%i)\n",
+ np, mux_name ?: "", index);
+ return ERR_PTR(ret);
+ }
+
+ mux_chip = of_find_mux_chip_by_node(args.np);
+ of_node_put(args.np);
+ if (!mux_chip)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ if (args.args_count > 1 ||
+ (!args.args_count && (mux_chip->controllers > 1))) {
+ dev_err(dev, "%pOF: wrong #mux-control-cells for %pOF\n",
+ np, args.np);
+ return ERR_PTR(-EINVAL);
+ }
+
+ controller = 0;
+ if (args.args_count)
+ controller = args.args[0];
+
+ if (controller >= mux_chip->controllers) {
+ dev_err(dev, "%pOF: bad mux controller %u specified in %pOF\n",
+ np, controller, args.np);
+ return ERR_PTR(-EINVAL);
+ }
+
+ get_device(&mux_chip->dev);
+ return &mux_chip->mux[controller];
+}
+EXPORT_SYMBOL_GPL(mux_control_get);
+
+/**
+ * mux_control_put() - Put away the mux-control for good.
+ * @mux: The mux-control to put away.
+ *
+ * mux_control_put() reverses the effects of mux_control_get().
+ */
+void mux_control_put(struct mux_control *mux)
+{
+ put_device(&mux->chip->dev);
+}
+EXPORT_SYMBOL_GPL(mux_control_put);
+
+static void devm_mux_control_release(struct device *dev, void *res)
+{
+ struct mux_control *mux = *(struct mux_control **)res;
+
+ mux_control_put(mux);
+}
+
+/**
+ * devm_mux_control_get() - Get the mux-control for a device, with resource
+ * management.
+ * @dev: The device that needs a mux-control.
+ * @mux_name: The name identifying the mux-control.
+ *
+ * Return: Pointer to the mux-control, or an ERR_PTR with a negative errno.
+ */
+struct mux_control *devm_mux_control_get(struct device *dev,
+ const char *mux_name)
+{
+ struct mux_control **ptr, *mux;
+
+ ptr = devres_alloc(devm_mux_control_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ mux = mux_control_get(dev, mux_name);
+ if (IS_ERR(mux)) {
+ devres_free(ptr);
+ return mux;
+ }
+
+ *ptr = mux;
+ devres_add(dev, ptr);
+
+ return mux;
+}
+EXPORT_SYMBOL_GPL(devm_mux_control_get);
+
+/*
+ * Using subsys_initcall instead of module_init here to try to ensure - for
+ * the non-modular case - that the subsystem is initialized when mux consumers
+ * and mux controllers start to use it.
+ * For the modular case, the ordering is ensured with module dependencies.
+ */
+subsys_initcall(mux_init);
+module_exit(mux_exit);
+
+MODULE_DESCRIPTION("Multiplexer subsystem");
+MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
+MODULE_LICENSE("GPL v2");
--- /dev/null
+/*
+ * 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");
--- /dev/null
+/*
+ * MMIO register bitfield-controlled multiplexer driver
+ *
+ * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
+ *
+ * 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/bitops.h>
+#include <linux/err.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/mux/driver.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+static int mux_mmio_set(struct mux_control *mux, int state)
+{
+ struct regmap_field **fields = mux_chip_priv(mux->chip);
+
+ return regmap_field_write(fields[mux_control_get_index(mux)], state);
+}
+
+static const struct mux_control_ops mux_mmio_ops = {
+ .set = mux_mmio_set,
+};
+
+static const struct of_device_id mux_mmio_dt_ids[] = {
+ { .compatible = "mmio-mux", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
+
+static int mux_mmio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct regmap_field **fields;
+ struct mux_chip *mux_chip;
+ struct regmap *regmap;
+ int num_fields;
+ int ret;
+ int i;
+
+ regmap = syscon_node_to_regmap(np->parent);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ dev_err(dev, "failed to get regmap: %d\n", ret);
+ return ret;
+ }
+
+ ret = of_property_count_u32_elems(np, "mux-reg-masks");
+ if (ret == 0 || ret % 2)
+ ret = -EINVAL;
+ if (ret < 0) {
+ dev_err(dev, "mux-reg-masks property missing or invalid: %d\n",
+ ret);
+ return ret;
+ }
+ num_fields = ret / 2;
+
+ mux_chip = devm_mux_chip_alloc(dev, num_fields, num_fields *
+ sizeof(*fields));
+ if (IS_ERR(mux_chip))
+ return PTR_ERR(mux_chip);
+
+ fields = mux_chip_priv(mux_chip);
+
+ for (i = 0; i < num_fields; i++) {
+ struct mux_control *mux = &mux_chip->mux[i];
+ struct reg_field field;
+ s32 idle_state = MUX_IDLE_AS_IS;
+ u32 reg, mask;
+ int bits;
+
+ ret = of_property_read_u32_index(np, "mux-reg-masks",
+ 2 * i, ®);
+ if (!ret)
+ ret = of_property_read_u32_index(np, "mux-reg-masks",
+ 2 * i + 1, &mask);
+ if (ret < 0) {
+ dev_err(dev, "bitfield %d: failed to read mux-reg-masks property: %d\n",
+ i, ret);
+ return ret;
+ }
+
+ field.reg = reg;
+ field.msb = fls(mask) - 1;
+ field.lsb = ffs(mask) - 1;
+
+ if (mask != GENMASK(field.msb, field.lsb)) {
+ dev_err(dev, "bitfield %d: invalid mask 0x%x\n",
+ i, mask);
+ return -EINVAL;
+ }
+
+ fields[i] = devm_regmap_field_alloc(dev, regmap, field);
+ if (IS_ERR(fields[i])) {
+ ret = PTR_ERR(fields[i]);
+ dev_err(dev, "bitfield %d: failed allocate: %d\n",
+ i, ret);
+ return ret;
+ }
+
+ bits = 1 + field.msb - field.lsb;
+ mux->states = 1 << bits;
+
+ of_property_read_u32_index(np, "idle-states", i,
+ (u32 *)&idle_state);
+ if (idle_state != MUX_IDLE_AS_IS) {
+ if (idle_state < 0 || idle_state >= mux->states) {
+ dev_err(dev, "bitfield: %d: out of range idle state %d\n",
+ i, idle_state);
+ return -EINVAL;
+ }
+
+ mux->idle_state = idle_state;
+ }
+ }
+
+ mux_chip->ops = &mux_mmio_ops;
+
+ return devm_mux_chip_register(dev, mux_chip);
+}
+
+static struct platform_driver mux_mmio_driver = {
+ .driver = {
+ .name = "mmio-mux",
+ .of_match_table = of_match_ptr(mux_mmio_dt_ids),
+ },
+ .probe = mux_mmio_probe,
+};
+module_platform_driver(mux_mmio_driver);
+
+MODULE_DESCRIPTION("MMIO register bitfield-controlled multiplexer driver");
+MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
+MODULE_LICENSE("GPL v2");
+++ /dev/null
-/*
- * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux
- *
- * 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/i2c.h>
-#include <linux/module.h>
-#include <linux/mux/driver.h>
-#include <linux/property.h>
-
-#define ADG792A_LDSW BIT(0)
-#define ADG792A_RESETB 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))
-
-static int adg792a_write_cmd(struct i2c_client *i2c, u8 cmd, int reset)
-{
- u8 data = ADG792A_RESETB | ADG792A_LDSW;
-
- /* ADG792A_RESETB is active low, the chip resets when it is zero. */
- if (reset)
- data &= ~ADG792A_RESETB;
-
- return i2c_smbus_write_byte_data(i2c, cmd, data);
-}
-
-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 == MUX_IDLE_DISCONNECT)
- cmd = ADG792A_DISABLE_ALL;
- else
- cmd = ADG792A_MUX_ALL(state);
- } else {
- unsigned int controller = mux_control_get_index(mux);
-
- if (state == MUX_IDLE_DISCONNECT)
- cmd = ADG792A_DISABLE(controller);
- else
- cmd = ADG792A_MUX(controller, state);
- }
-
- return adg792a_write_cmd(i2c, cmd, 0);
-}
-
-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;
- s32 idle_state[3];
- u32 cells;
- int ret;
- int i;
-
- if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- return -ENODEV;
-
- ret = device_property_read_u32(dev, "#mux-control-cells", &cells);
- if (ret < 0)
- return ret;
- if (cells >= 2)
- return -EINVAL;
-
- mux_chip = devm_mux_chip_alloc(dev, cells ? 3 : 1, 0);
- if (IS_ERR(mux_chip))
- return PTR_ERR(mux_chip);
-
- mux_chip->ops = &adg792a_ops;
-
- ret = adg792a_write_cmd(i2c, ADG792A_DISABLE_ALL, 1);
- if (ret < 0)
- return ret;
-
- ret = device_property_read_u32_array(dev, "idle-state",
- (u32 *)idle_state,
- mux_chip->controllers);
- if (ret < 0) {
- idle_state[0] = MUX_IDLE_AS_IS;
- idle_state[1] = MUX_IDLE_AS_IS;
- idle_state[2] = MUX_IDLE_AS_IS;
- }
-
- for (i = 0; i < mux_chip->controllers; ++i) {
- struct mux_control *mux = &mux_chip->mux[i];
-
- mux->states = 4;
-
- switch (idle_state[i]) {
- case MUX_IDLE_DISCONNECT:
- case MUX_IDLE_AS_IS:
- case 0 ... 4:
- mux->idle_state = idle_state[i];
- break;
- default:
- dev_err(dev, "invalid idle-state %d\n", idle_state[i]);
- return -EINVAL;
- }
- }
-
- ret = devm_mux_chip_register(dev, mux_chip);
- if (ret < 0)
- return ret;
-
- if (cells)
- dev_info(dev, "3x single pole quadruple throw muxes registered\n");
- else
- dev_info(dev, "triple pole quadruple throw mux 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");
+++ /dev/null
-/*
- * Multiplexer subsystem
- *
- * 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.
- */
-
-#define pr_fmt(fmt) "mux-core: " fmt
-
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/export.h>
-#include <linux/idr.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mux/consumer.h>
-#include <linux/mux/driver.h>
-#include <linux/of.h>
-#include <linux/of_platform.h>
-#include <linux/slab.h>
-
-/*
- * The idle-as-is "state" is not an actual state that may be selected, it
- * only implies that the state should not be changed. So, use that state
- * as indication that the cached state of the multiplexer is unknown.
- */
-#define MUX_CACHE_UNKNOWN MUX_IDLE_AS_IS
-
-static struct class mux_class = {
- .name = "mux",
- .owner = THIS_MODULE,
-};
-
-static DEFINE_IDA(mux_ida);
-
-static int __init mux_init(void)
-{
- ida_init(&mux_ida);
- return class_register(&mux_class);
-}
-
-static void __exit mux_exit(void)
-{
- class_unregister(&mux_class);
- ida_destroy(&mux_ida);
-}
-
-static void mux_chip_release(struct device *dev)
-{
- struct mux_chip *mux_chip = to_mux_chip(dev);
-
- ida_simple_remove(&mux_ida, mux_chip->id);
- kfree(mux_chip);
-}
-
-static struct device_type mux_type = {
- .name = "mux-chip",
- .release = mux_chip_release,
-};
-
-/**
- * mux_chip_alloc() - Allocate a mux-chip.
- * @dev: The parent device implementing the mux interface.
- * @controllers: The number of mux controllers to allocate for this chip.
- * @sizeof_priv: Size of extra memory area for private use by the caller.
- *
- * After allocating the mux-chip with the desired number of mux controllers
- * but before registering the chip, the mux driver is required to configure
- * the number of valid mux states in the mux_chip->mux[N].states members and
- * the desired idle state in the returned mux_chip->mux[N].idle_state members.
- * The default idle state is MUX_IDLE_AS_IS. The mux driver also needs to
- * provide a pointer to the operations struct in the mux_chip->ops member
- * before registering the mux-chip with mux_chip_register.
- *
- * Return: A pointer to the new mux-chip, or an ERR_PTR with a negative errno.
- */
-struct mux_chip *mux_chip_alloc(struct device *dev,
- unsigned int controllers, size_t sizeof_priv)
-{
- struct mux_chip *mux_chip;
- int i;
-
- if (WARN_ON(!dev || !controllers))
- return ERR_PTR(-EINVAL);
-
- mux_chip = kzalloc(sizeof(*mux_chip) +
- controllers * sizeof(*mux_chip->mux) +
- sizeof_priv, GFP_KERNEL);
- if (!mux_chip)
- return ERR_PTR(-ENOMEM);
-
- mux_chip->mux = (struct mux_control *)(mux_chip + 1);
- mux_chip->dev.class = &mux_class;
- mux_chip->dev.type = &mux_type;
- mux_chip->dev.parent = dev;
- mux_chip->dev.of_node = dev->of_node;
- dev_set_drvdata(&mux_chip->dev, mux_chip);
-
- mux_chip->id = ida_simple_get(&mux_ida, 0, 0, GFP_KERNEL);
- if (mux_chip->id < 0) {
- int err = mux_chip->id;
-
- pr_err("muxchipX failed to get a device id\n");
- kfree(mux_chip);
- return ERR_PTR(err);
- }
- dev_set_name(&mux_chip->dev, "muxchip%d", mux_chip->id);
-
- mux_chip->controllers = controllers;
- for (i = 0; i < controllers; ++i) {
- struct mux_control *mux = &mux_chip->mux[i];
-
- mux->chip = mux_chip;
- sema_init(&mux->lock, 1);
- mux->cached_state = MUX_CACHE_UNKNOWN;
- mux->idle_state = MUX_IDLE_AS_IS;
- }
-
- device_initialize(&mux_chip->dev);
-
- return mux_chip;
-}
-EXPORT_SYMBOL_GPL(mux_chip_alloc);
-
-static int mux_control_set(struct mux_control *mux, int state)
-{
- int ret = mux->chip->ops->set(mux, state);
-
- mux->cached_state = ret < 0 ? MUX_CACHE_UNKNOWN : state;
-
- return ret;
-}
-
-/**
- * mux_chip_register() - Register a mux-chip, thus readying the controllers
- * for use.
- * @mux_chip: The mux-chip to register.
- *
- * Do not retry registration of the same mux-chip on failure. You should
- * instead put it away with mux_chip_free() and allocate a new one, if you
- * for some reason would like to retry registration.
- *
- * Return: Zero on success or a negative errno on error.
- */
-int mux_chip_register(struct mux_chip *mux_chip)
-{
- int i;
- int ret;
-
- for (i = 0; i < mux_chip->controllers; ++i) {
- struct mux_control *mux = &mux_chip->mux[i];
-
- if (mux->idle_state == mux->cached_state)
- continue;
-
- ret = mux_control_set(mux, mux->idle_state);
- if (ret < 0) {
- dev_err(&mux_chip->dev, "unable to set idle state\n");
- return ret;
- }
- }
-
- ret = device_add(&mux_chip->dev);
- if (ret < 0)
- dev_err(&mux_chip->dev,
- "device_add failed in %s: %d\n", __func__, ret);
- return ret;
-}
-EXPORT_SYMBOL_GPL(mux_chip_register);
-
-/**
- * mux_chip_unregister() - Take the mux-chip off-line.
- * @mux_chip: The mux-chip to unregister.
- *
- * mux_chip_unregister() reverses the effects of mux_chip_register().
- * But not completely, you should not try to call mux_chip_register()
- * on a mux-chip that has been registered before.
- */
-void mux_chip_unregister(struct mux_chip *mux_chip)
-{
- device_del(&mux_chip->dev);
-}
-EXPORT_SYMBOL_GPL(mux_chip_unregister);
-
-/**
- * mux_chip_free() - Free the mux-chip for good.
- * @mux_chip: The mux-chip to free.
- *
- * mux_chip_free() reverses the effects of mux_chip_alloc().
- */
-void mux_chip_free(struct mux_chip *mux_chip)
-{
- if (!mux_chip)
- return;
-
- put_device(&mux_chip->dev);
-}
-EXPORT_SYMBOL_GPL(mux_chip_free);
-
-static void devm_mux_chip_release(struct device *dev, void *res)
-{
- struct mux_chip *mux_chip = *(struct mux_chip **)res;
-
- mux_chip_free(mux_chip);
-}
-
-/**
- * devm_mux_chip_alloc() - Resource-managed version of mux_chip_alloc().
- * @dev: The parent device implementing the mux interface.
- * @controllers: The number of mux controllers to allocate for this chip.
- * @sizeof_priv: Size of extra memory area for private use by the caller.
- *
- * See mux_chip_alloc() for more details.
- *
- * Return: A pointer to the new mux-chip, or an ERR_PTR with a negative errno.
- */
-struct mux_chip *devm_mux_chip_alloc(struct device *dev,
- unsigned int controllers,
- size_t sizeof_priv)
-{
- struct mux_chip **ptr, *mux_chip;
-
- ptr = devres_alloc(devm_mux_chip_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return ERR_PTR(-ENOMEM);
-
- mux_chip = mux_chip_alloc(dev, controllers, sizeof_priv);
- if (IS_ERR(mux_chip)) {
- devres_free(ptr);
- return mux_chip;
- }
-
- *ptr = mux_chip;
- devres_add(dev, ptr);
-
- return mux_chip;
-}
-EXPORT_SYMBOL_GPL(devm_mux_chip_alloc);
-
-static void devm_mux_chip_reg_release(struct device *dev, void *res)
-{
- struct mux_chip *mux_chip = *(struct mux_chip **)res;
-
- mux_chip_unregister(mux_chip);
-}
-
-/**
- * devm_mux_chip_register() - Resource-managed version mux_chip_register().
- * @dev: The parent device implementing the mux interface.
- * @mux_chip: The mux-chip to register.
- *
- * See mux_chip_register() for more details.
- *
- * Return: Zero on success or a negative errno on error.
- */
-int devm_mux_chip_register(struct device *dev,
- struct mux_chip *mux_chip)
-{
- struct mux_chip **ptr;
- int res;
-
- ptr = devres_alloc(devm_mux_chip_reg_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return -ENOMEM;
-
- res = mux_chip_register(mux_chip);
- if (res) {
- devres_free(ptr);
- return res;
- }
-
- *ptr = mux_chip;
- devres_add(dev, ptr);
-
- return res;
-}
-EXPORT_SYMBOL_GPL(devm_mux_chip_register);
-
-/**
- * mux_control_states() - Query the number of multiplexer states.
- * @mux: The mux-control to query.
- *
- * Return: The number of multiplexer states.
- */
-unsigned int mux_control_states(struct mux_control *mux)
-{
- return mux->states;
-}
-EXPORT_SYMBOL_GPL(mux_control_states);
-
-/*
- * The mux->lock must be down when calling this function.
- */
-static int __mux_control_select(struct mux_control *mux, int state)
-{
- int ret;
-
- if (WARN_ON(state < 0 || state >= mux->states))
- return -EINVAL;
-
- if (mux->cached_state == state)
- return 0;
-
- ret = mux_control_set(mux, state);
- if (ret >= 0)
- return 0;
-
- /* The mux update failed, try to revert if appropriate... */
- if (mux->idle_state != MUX_IDLE_AS_IS)
- mux_control_set(mux, mux->idle_state);
-
- return ret;
-}
-
-/**
- * mux_control_select() - Select the given multiplexer state.
- * @mux: The mux-control to request a change of state from.
- * @state: The new requested state.
- *
- * On successfully selecting the mux-control state, it will be locked until
- * there is a call to mux_control_deselect(). If the mux-control is already
- * selected when mux_control_select() is called, the caller will be blocked
- * until mux_control_deselect() is called (by someone else).
- *
- * Therefore, make sure to call mux_control_deselect() when the operation is
- * complete and the mux-control is free for others to use, but do not call
- * mux_control_deselect() if mux_control_select() fails.
- *
- * Return: 0 when the mux-control state has the requested state or a negative
- * errno on error.
- */
-int mux_control_select(struct mux_control *mux, unsigned int state)
-{
- int ret;
-
- ret = down_killable(&mux->lock);
- if (ret < 0)
- return ret;
-
- ret = __mux_control_select(mux, state);
-
- if (ret < 0)
- up(&mux->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(mux_control_select);
-
-/**
- * mux_control_try_select() - Try to select the given multiplexer state.
- * @mux: The mux-control to request a change of state from.
- * @state: The new requested state.
- *
- * On successfully selecting the mux-control state, it will be locked until
- * mux_control_deselect() called.
- *
- * Therefore, make sure to call mux_control_deselect() when the operation is
- * complete and the mux-control is free for others to use, but do not call
- * mux_control_deselect() if mux_control_try_select() fails.
- *
- * Return: 0 when the mux-control state has the requested state or a negative
- * errno on error. Specifically -EBUSY if the mux-control is contended.
- */
-int mux_control_try_select(struct mux_control *mux, unsigned int state)
-{
- int ret;
-
- if (down_trylock(&mux->lock))
- return -EBUSY;
-
- ret = __mux_control_select(mux, state);
-
- if (ret < 0)
- up(&mux->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(mux_control_try_select);
-
-/**
- * mux_control_deselect() - Deselect the previously selected multiplexer state.
- * @mux: The mux-control to deselect.
- *
- * It is required that a single call is made to mux_control_deselect() for
- * each and every successful call made to either of mux_control_select() or
- * mux_control_try_select().
- *
- * Return: 0 on success and a negative errno on error. An error can only
- * occur if the mux has an idle state. Note that even if an error occurs, the
- * mux-control is unlocked and is thus free for the next access.
- */
-int mux_control_deselect(struct mux_control *mux)
-{
- int ret = 0;
-
- if (mux->idle_state != MUX_IDLE_AS_IS &&
- mux->idle_state != mux->cached_state)
- ret = mux_control_set(mux, mux->idle_state);
-
- up(&mux->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(mux_control_deselect);
-
-static int of_dev_node_match(struct device *dev, const void *data)
-{
- return dev->of_node == data;
-}
-
-static struct mux_chip *of_find_mux_chip_by_node(struct device_node *np)
-{
- struct device *dev;
-
- dev = class_find_device(&mux_class, NULL, np, of_dev_node_match);
-
- return dev ? to_mux_chip(dev) : NULL;
-}
-
-/**
- * mux_control_get() - Get the mux-control for a device.
- * @dev: The device that needs a mux-control.
- * @mux_name: The name identifying the mux-control.
- *
- * Return: A pointer to the mux-control, or an ERR_PTR with a negative errno.
- */
-struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
-{
- struct device_node *np = dev->of_node;
- struct of_phandle_args args;
- struct mux_chip *mux_chip;
- unsigned int controller;
- int index = 0;
- int ret;
-
- if (mux_name) {
- index = of_property_match_string(np, "mux-control-names",
- mux_name);
- if (index < 0) {
- dev_err(dev, "mux controller '%s' not found\n",
- mux_name);
- return ERR_PTR(index);
- }
- }
-
- ret = of_parse_phandle_with_args(np,
- "mux-controls", "#mux-control-cells",
- index, &args);
- if (ret) {
- dev_err(dev, "%pOF: failed to get mux-control %s(%i)\n",
- np, mux_name ?: "", index);
- return ERR_PTR(ret);
- }
-
- mux_chip = of_find_mux_chip_by_node(args.np);
- of_node_put(args.np);
- if (!mux_chip)
- return ERR_PTR(-EPROBE_DEFER);
-
- if (args.args_count > 1 ||
- (!args.args_count && (mux_chip->controllers > 1))) {
- dev_err(dev, "%pOF: wrong #mux-control-cells for %pOF\n",
- np, args.np);
- return ERR_PTR(-EINVAL);
- }
-
- controller = 0;
- if (args.args_count)
- controller = args.args[0];
-
- if (controller >= mux_chip->controllers) {
- dev_err(dev, "%pOF: bad mux controller %u specified in %pOF\n",
- np, controller, args.np);
- return ERR_PTR(-EINVAL);
- }
-
- get_device(&mux_chip->dev);
- return &mux_chip->mux[controller];
-}
-EXPORT_SYMBOL_GPL(mux_control_get);
-
-/**
- * mux_control_put() - Put away the mux-control for good.
- * @mux: The mux-control to put away.
- *
- * mux_control_put() reverses the effects of mux_control_get().
- */
-void mux_control_put(struct mux_control *mux)
-{
- put_device(&mux->chip->dev);
-}
-EXPORT_SYMBOL_GPL(mux_control_put);
-
-static void devm_mux_control_release(struct device *dev, void *res)
-{
- struct mux_control *mux = *(struct mux_control **)res;
-
- mux_control_put(mux);
-}
-
-/**
- * devm_mux_control_get() - Get the mux-control for a device, with resource
- * management.
- * @dev: The device that needs a mux-control.
- * @mux_name: The name identifying the mux-control.
- *
- * Return: Pointer to the mux-control, or an ERR_PTR with a negative errno.
- */
-struct mux_control *devm_mux_control_get(struct device *dev,
- const char *mux_name)
-{
- struct mux_control **ptr, *mux;
-
- ptr = devres_alloc(devm_mux_control_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return ERR_PTR(-ENOMEM);
-
- mux = mux_control_get(dev, mux_name);
- if (IS_ERR(mux)) {
- devres_free(ptr);
- return mux;
- }
-
- *ptr = mux;
- devres_add(dev, ptr);
-
- return mux;
-}
-EXPORT_SYMBOL_GPL(devm_mux_control_get);
-
-/*
- * Using subsys_initcall instead of module_init here to try to ensure - for
- * the non-modular case - that the subsystem is initialized when mux consumers
- * and mux controllers start to use it.
- * For the modular case, the ordering is ensured with module dependencies.
- */
-subsys_initcall(mux_init);
-module_exit(mux_exit);
-
-MODULE_DESCRIPTION("Multiplexer subsystem");
-MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
-MODULE_LICENSE("GPL v2");
+++ /dev/null
-/*
- * 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");
+++ /dev/null
-/*
- * MMIO register bitfield-controlled multiplexer driver
- *
- * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
- *
- * 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/bitops.h>
-#include <linux/err.h>
-#include <linux/mfd/syscon.h>
-#include <linux/module.h>
-#include <linux/mux/driver.h>
-#include <linux/of_platform.h>
-#include <linux/platform_device.h>
-#include <linux/property.h>
-#include <linux/regmap.h>
-
-static int mux_mmio_set(struct mux_control *mux, int state)
-{
- struct regmap_field **fields = mux_chip_priv(mux->chip);
-
- return regmap_field_write(fields[mux_control_get_index(mux)], state);
-}
-
-static const struct mux_control_ops mux_mmio_ops = {
- .set = mux_mmio_set,
-};
-
-static const struct of_device_id mux_mmio_dt_ids[] = {
- { .compatible = "mmio-mux", },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
-
-static int mux_mmio_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
- struct regmap_field **fields;
- struct mux_chip *mux_chip;
- struct regmap *regmap;
- int num_fields;
- int ret;
- int i;
-
- regmap = syscon_node_to_regmap(np->parent);
- if (IS_ERR(regmap)) {
- ret = PTR_ERR(regmap);
- dev_err(dev, "failed to get regmap: %d\n", ret);
- return ret;
- }
-
- ret = of_property_count_u32_elems(np, "mux-reg-masks");
- if (ret == 0 || ret % 2)
- ret = -EINVAL;
- if (ret < 0) {
- dev_err(dev, "mux-reg-masks property missing or invalid: %d\n",
- ret);
- return ret;
- }
- num_fields = ret / 2;
-
- mux_chip = devm_mux_chip_alloc(dev, num_fields, num_fields *
- sizeof(*fields));
- if (IS_ERR(mux_chip))
- return PTR_ERR(mux_chip);
-
- fields = mux_chip_priv(mux_chip);
-
- for (i = 0; i < num_fields; i++) {
- struct mux_control *mux = &mux_chip->mux[i];
- struct reg_field field;
- s32 idle_state = MUX_IDLE_AS_IS;
- u32 reg, mask;
- int bits;
-
- ret = of_property_read_u32_index(np, "mux-reg-masks",
- 2 * i, ®);
- if (!ret)
- ret = of_property_read_u32_index(np, "mux-reg-masks",
- 2 * i + 1, &mask);
- if (ret < 0) {
- dev_err(dev, "bitfield %d: failed to read mux-reg-masks property: %d\n",
- i, ret);
- return ret;
- }
-
- field.reg = reg;
- field.msb = fls(mask) - 1;
- field.lsb = ffs(mask) - 1;
-
- if (mask != GENMASK(field.msb, field.lsb)) {
- dev_err(dev, "bitfield %d: invalid mask 0x%x\n",
- i, mask);
- return -EINVAL;
- }
-
- fields[i] = devm_regmap_field_alloc(dev, regmap, field);
- if (IS_ERR(fields[i])) {
- ret = PTR_ERR(fields[i]);
- dev_err(dev, "bitfield %d: failed allocate: %d\n",
- i, ret);
- return ret;
- }
-
- bits = 1 + field.msb - field.lsb;
- mux->states = 1 << bits;
-
- of_property_read_u32_index(np, "idle-states", i,
- (u32 *)&idle_state);
- if (idle_state != MUX_IDLE_AS_IS) {
- if (idle_state < 0 || idle_state >= mux->states) {
- dev_err(dev, "bitfield: %d: out of range idle state %d\n",
- i, idle_state);
- return -EINVAL;
- }
-
- mux->idle_state = idle_state;
- }
- }
-
- mux_chip->ops = &mux_mmio_ops;
-
- return devm_mux_chip_register(dev, mux_chip);
-}
-
-static struct platform_driver mux_mmio_driver = {
- .driver = {
- .name = "mmio-mux",
- .of_match_table = of_match_ptr(mux_mmio_dt_ids),
- },
- .probe = mux_mmio_probe,
-};
-module_platform_driver(mux_mmio_driver);
-
-MODULE_DESCRIPTION("MMIO register bitfield-controlled multiplexer driver");
-MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
-MODULE_LICENSE("GPL v2");
projects / mirror_ubuntu-bionic-kernel.git / commitdiff