[PATCH 18/26] net: wan: Add framer framework support

Herve Codina
2023-07-25T09:27:53Z

A framer is a component in charge of an E1/T1 line interface.
Connected usually to a TDM bus, it converts TDM frames to/from E1/T1
frames. It also provides information related to the E1/T1 line.

The framer framework provides a set of APIs for the framer drivers
(framer provider) to create/destroy a framer and APIs for the framer
users (framer consumer) to obtain a reference to the framer, and
use the framer.

This basic implementation provides a framer abstraction for:
- power on/off the framer
- get the framer status (line state)
- be notified on framer status changes
- get/set the framer configuration

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
drivers/net/wan/Kconfig | 2 +
drivers/net/wan/Makefile | 2 +
drivers/net/wan/framer/Kconfig | 19 +
drivers/net/wan/framer/Makefile | 6 +
drivers/net/wan/framer/framer-core.c | 935 +++++++++++++++++++++++++
include/linux/framer/framer-provider.h | 194 +++++
include/linux/framer/framer.h | 215 ++++++
7 files changed, 1373 insertions(+)
create mode 100644 drivers/net/wan/framer/Kconfig
create mode 100644 drivers/net/wan/framer/Makefile
create mode 100644 drivers/net/wan/framer/framer-core.c
create mode 100644 include/linux/framer/framer-provider.h
create mode 100644 include/linux/framer/framer.h

diff --git a/drivers/net/wan/Kconfig b/drivers/net/wan/Kconfig
index 8de99f4b647b..31ab2136cdf1 100644
--- a/drivers/net/wan/Kconfig
+++ b/drivers/net/wan/Kconfig
@@ -95,6 +95,8 @@ config HDLC_X25
comment "X.25/LAPB support is disabled"
depends on HDLC && (LAPB!=m || HDLC!=m) && LAPB!=y

+source "drivers/net/wan/framer/Kconfig"
+
config PCI200SYN
tristate "Goramo PCI200SYN support"
depends on HDLC && PCI
diff --git a/drivers/net/wan/Makefile b/drivers/net/wan/Makefile
index f338f4830626..00e9b7ee1e01 100644
--- a/drivers/net/wan/Makefile
+++ b/drivers/net/wan/Makefile
@@ -14,6 +14,8 @@ obj-$(CONFIG_HDLC_FR) += hdlc_fr.o
obj-$(CONFIG_HDLC_PPP) += hdlc_ppp.o
obj-$(CONFIG_HDLC_X25) += hdlc_x25.o

+obj-y += framer/
+
obj-$(CONFIG_FARSYNC) += farsync.o

obj-$(CONFIG_LAPBETHER) += lapbether.o
diff --git a/drivers/net/wan/framer/Kconfig b/drivers/net/wan/framer/Kconfig
new file mode 100644
index 000000000000..96ef1e7ba8eb
--- /dev/null
+++ b/drivers/net/wan/framer/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# FRAMER
+#
+
+menu "Framer Subsystem"
+
+config GENERIC_FRAMER
+ bool "Framer Core"
+ help
+ Generic Framer support.
+
+ This framework is designed to provide a generic interface for framer
+ devices present in the kernel. This layer will have the generic
+ API by which framer drivers can create framer using the framer
+ framework and framer users can obtain reference to the framer.
+ All the users of this framework should select this config.
+
+endmenu
diff --git a/drivers/net/wan/framer/Makefile b/drivers/net/wan/framer/Makefile
new file mode 100644
index 000000000000..78dbd8e563d0
--- /dev/null
+++ b/drivers/net/wan/framer/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the framer drivers.
+#
+
+obj-$(CONFIG_GENERIC_FRAMER) += framer-core.o
diff --git a/drivers/net/wan/framer/framer-core.c b/drivers/net/wan/framer/framer-core.c
new file mode 100644
index 000000000000..ef93b7d74fd1
--- /dev/null
+++ b/drivers/net/wan/framer/framer-core.c
@@ -0,0 +1,935 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Generic Framer framework.
+ *
+ * Copyright 2023 CS GROUP France
+ *
+ * Author: Herve Codina <herve.codina@bootlin.com>
+ */
+
+#include <linux/device.h>
+#include <linux/framer/framer.h>
+#include <linux/framer/framer-provider.h>
+#include <linux/idr.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+static struct class *framer_class;
+static DEFINE_MUTEX(framer_provider_mutex);
+static LIST_HEAD(framer_provider_list);
+static DEFINE_IDA(framer_ida);
+
+#define dev_to_framer(a) (container_of((a), struct framer, dev))
+
+int framer_pm_runtime_get(struct framer *framer)
+{
+ int ret;
+
+ if (!framer)
+ return 0;
+
+ if (!pm_runtime_enabled(&framer->dev))
+ return -EOPNOTSUPP;
+
+ ret = pm_runtime_get(&framer->dev);
+ if (ret < 0 && ret != -EINPROGRESS)
+ pm_runtime_put_noidle(&framer->dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_pm_runtime_get);
+
+int framer_pm_runtime_get_sync(struct framer *framer)
+{
+ int ret;
+
+ if (!framer)
+ return 0;
+
+ if (!pm_runtime_enabled(&framer->dev))
+ return -EOPNOTSUPP;
+
+ ret = pm_runtime_get_sync(&framer->dev);
+ if (ret < 0)
+ pm_runtime_put_sync(&framer->dev);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_pm_runtime_get_sync);
+
+int framer_pm_runtime_put(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+
+ if (!pm_runtime_enabled(&framer->dev))
+ return -EOPNOTSUPP;
+
+ return pm_runtime_put(&framer->dev);
+}
+EXPORT_SYMBOL_GPL(framer_pm_runtime_put);
+
+int framer_pm_runtime_put_sync(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+
+ if (!pm_runtime_enabled(&framer->dev))
+ return -EOPNOTSUPP;
+
+ return pm_runtime_put_sync(&framer->dev);
+}
+EXPORT_SYMBOL_GPL(framer_pm_runtime_put_sync);
+
+/**
+ * framer_init - framer internal initialization before framer operation
+ * @framer: the framer returned by framer_get()
+ *
+ * Used to allow framer's driver to perform framer internal initialization,
+ * such as PLL block powering, clock initialization or anything that's
+ * is required by the framer to perform the start of operation.
+ * Must be called before framer_power_on().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_init(struct framer *framer)
+{
+ bool start_polling = false;
+ int ret;
+
+ if (!framer)
+ return 0;
+
+ ret = framer_pm_runtime_get_sync(framer);
+ if (ret < 0 && ret != -EOPNOTSUPP)
+ return ret;
+ ret = 0; /* Override possible ret == -EOPNOTSUPP */
+
+ mutex_lock(&framer->mutex);
+ if (framer->power_count > framer->init_count)
+ dev_warn(&framer->dev, "framer_power_on was called before framer init\n");
+
+ if (framer->init_count == 0) {
+ if (framer->ops->init) {
+ ret = framer->ops->init(framer);
+ if (ret < 0) {
+ dev_err(&framer->dev, "framer init failed --> %d\n", ret);
+ goto out;
+ }
+ }
+ if (framer->ops->flags & FRAMER_FLAG_POLL_STATUS)
+ start_polling = true;
+ }
+ ++framer->init_count;
+
+out:
+ mutex_unlock(&framer->mutex);
+
+ if (!ret && start_polling) {
+ ret = framer_get_status(framer, &framer->prev_status);
+ if (ret < 0) {
+ dev_warn(&framer->dev, "framer get status failed --> %d\n", ret);
+ /* Will be retried on polling_work */
+ ret = 0;
+ }
+ queue_delayed_work(system_power_efficient_wq, &framer->polling_work, 1 * HZ);
+ }
+
+ framer_pm_runtime_put(framer);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_init);
+
+/**
+ * framer_exit - Framer internal un-initialization
+ * @framer: the framer returned by framer_get()
+ *
+ * Must be called after framer_power_off().
+ */
+int framer_exit(struct framer *framer)
+{
+ int ret;
+
+ if (!framer)
+ return 0;
+
+ ret = framer_pm_runtime_get_sync(framer);
+ if (ret < 0 && ret != -EOPNOTSUPP)
+ return ret;
+ ret = 0; /* Override possible ret == -EOPNOTSUPP */
+
+ mutex_lock(&framer->mutex);
+ --framer->init_count;
+ if (framer->init_count == 0) {
+ if (framer->ops->flags & FRAMER_FLAG_POLL_STATUS) {
+ mutex_unlock(&framer->mutex);
+ cancel_delayed_work_sync(&framer->polling_work);
+ mutex_lock(&framer->mutex);
+ }
+
+ if (framer->ops->exit)
+ framer->ops->exit(framer);
+ }
+
+ mutex_unlock(&framer->mutex);
+ framer_pm_runtime_put(framer);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_exit);
+
+/**
+ * framer_power_on - Enable the framer and enter proper operation
+ * @framer: the framer returned by framer_get()
+ *
+ * Must be called after framer_init().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_power_on(struct framer *framer)
+{
+ int ret = 0;
+
+ if (!framer)
+ goto out;
+
+ if (framer->pwr) {
+ ret = regulator_enable(framer->pwr);
+ if (ret)
+ goto out;
+ }
+
+ ret = framer_pm_runtime_get_sync(framer);
+ if (ret < 0 && ret != -EOPNOTSUPP)
+ goto err_pm_sync;
+
+ ret = 0; /* Override possible ret == -EOPNOTSUPP */
+
+ mutex_lock(&framer->mutex);
+ if (framer->power_count == 0 && framer->ops->power_on) {
+ ret = framer->ops->power_on(framer);
+ if (ret < 0) {
+ dev_err(&framer->dev, "framer poweron failed --> %d\n", ret);
+ goto err_pwr_on;
+ }
+ }
+ ++framer->power_count;
+ mutex_unlock(&framer->mutex);
+ return 0;
+
+err_pwr_on:
+ mutex_unlock(&framer->mutex);
+ framer_pm_runtime_put_sync(framer);
+err_pm_sync:
+ if (framer->pwr)
+ regulator_disable(framer->pwr);
+out:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_power_on);
+
+/**
+ * framer_power_off - Disable the framer.
+ * @framer: the framer returned by framer_get()
+ *
+ * Must be called before framer_exit().
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_power_off(struct framer *framer)
+{
+ int ret;
+
+ if (!framer)
+ return 0;
+
+ mutex_lock(&framer->mutex);
+ if (framer->power_count == 1 && framer->ops->power_off) {
+ ret = framer->ops->power_off(framer);
+ if (ret < 0) {
+ dev_err(&framer->dev, "framer poweroff failed --> %d\n", ret);
+ mutex_unlock(&framer->mutex);
+ return ret;
+ }
+ }
+ --framer->power_count;
+ mutex_unlock(&framer->mutex);
+ framer_pm_runtime_put(framer);
+
+ if (framer->pwr)
+ regulator_disable(framer->pwr);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(framer_power_off);
+
+/**
+ * framer_get_status() - Gets the framer status
+ * @framer: the framer returned by framer_get()
+ * @status: the status to retrieve
+ *
+ * Used to get the framer status. framer_init() must have been called
+ * on the framer.
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_get_status(struct framer *framer, struct framer_status *status)
+{
+ int ret;
+
+ if (!framer)
+ return -EINVAL;
+
+ if (!framer->ops->get_status)
+ return -EOPNOTSUPP;
+
+ /* Be sure to have known values (struct padding and future extensions) */
+ memset(status, 0, sizeof(*status));
+
+ mutex_lock(&framer->mutex);
+ ret = framer->ops->get_status(framer, status);
+ mutex_unlock(&framer->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_get_status);
+
+/**
+ * framer_set_config() - Sets the framer configuration
+ * @framer: the framer returned by framer_get()
+ * @config: the configuration to set
+ *
+ * Used to set the framer configuration. framer_init() must have been called
+ * on the framer.
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_set_config(struct framer *framer, const struct framer_config *config)
+{
+ int ret;
+
+ if (!framer)
+ return -EINVAL;
+
+ if (!framer->ops->set_config)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&framer->mutex);
+ ret = framer->ops->set_config(framer, config);
+ mutex_unlock(&framer->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_set_config);
+
+/**
+ * framer_get_config() - Gets the framer configuration
+ * @framer: the framer returned by framer_get()
+ * @config: the configuration to retrieve
+ *
+ * Used to get the framer configuration. framer_init() must have been called
+ * on the framer.
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_get_config(struct framer *framer, struct framer_config *config)
+{
+ int ret;
+
+ if (!framer)
+ return -EINVAL;
+
+ if (!framer->ops->get_config)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&framer->mutex);
+ ret = framer->ops->get_config(framer, config);
+ mutex_unlock(&framer->mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(framer_get_config);
+
+static void framer_polling_work(struct work_struct *work)
+{
+ struct framer *framer = container_of(work, struct framer, polling_work.work);
+ struct framer_status status;
+ int ret;
+
+ ret = framer_get_status(framer, &status);
+ if (ret) {
+ dev_err(&framer->dev, "polling, get status failed (%d)\n", ret);
+ goto end;
+ }
+ if (memcmp(&framer->prev_status, &status, sizeof(status))) {
+ blocking_notifier_call_chain(&framer->notifier_list,
+ FRAMER_EVENT_STATUS, NULL);
+ memcpy(&framer->prev_status, &status, sizeof(status));
+ }
+
+end:
+ /* Re-schedule task in 1 sec */
+ queue_delayed_work(system_power_efficient_wq, &framer->polling_work, 1 * HZ);
+}
+
+/**
+ * framer_notifier_register() - Registers a notifier
+ * @framer: the framer returned by framer_get()
+ * @nb: the notifier block to register
+ *
+ * Used to register a notifier block on framer events. framer_init() must have
+ * been called on the framer.
+ * The available framer events are present in enum framer_events.
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_notifier_register(struct framer *framer, struct notifier_block *nb)
+{
+ if (!framer)
+ return 0;
+
+ return blocking_notifier_chain_register(&framer->notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(framer_notifier_register);
+
+/**
+ * framer_notifier_unregister() - Unregisters a notifier
+ * @framer: the framer returned by framer_get()
+ * @nb: the notifier block to unregister
+ *
+ * Used to unregister a notifier block. framer_init() must have
+ * been called on the framer.
+ *
+ * Return: %0 if successful, a negative error code otherwise
+ */
+int framer_notifier_unregister(struct framer *framer, struct notifier_block *nb)
+{
+ if (!framer)
+ return -EINVAL;
+
+ return blocking_notifier_chain_unregister(&framer->notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(framer_atomic_notifier_unregister);
+
+static struct framer_provider *framer_provider_of_lookup(const struct device_node *node)
+{
+ struct framer_provider *framer_provider;
+
+ list_for_each_entry(framer_provider, &framer_provider_list, list) {
+ if (device_match_of_node(framer_provider->dev, node))
+ return framer_provider;
+ }
+
+ return ERR_PTR(-EPROBE_DEFER);
+}
+
+static struct framer *framer_of_get_from_provider(struct of_phandle_args *args)
+{
+ struct framer_provider *framer_provider;
+ struct framer *framer;
+
+ mutex_lock(&framer_provider_mutex);
+ framer_provider = framer_provider_of_lookup(args->np);
+ if (IS_ERR(framer_provider) || !try_module_get(framer_provider->owner)) {
+ framer = ERR_PTR(-EPROBE_DEFER);
+ goto end;
+ }
+
+ framer = framer_provider->of_xlate(framer_provider->dev, args);
+
+ module_put(framer_provider->owner);
+
+end:
+ mutex_unlock(&framer_provider_mutex);
+
+ return framer;
+}
+
+static struct framer *framer_of_get_byphandle(struct device_node *np, const char *propname,
+ int index)
+{
+ struct of_phandle_args args;
+ struct framer *framer;
+ int ret;
+
+ ret = of_parse_phandle_with_args(np, propname, "#framer-cells", index, &args);
+ if (ret)
+ return ERR_PTR(-ENODEV);
+
+ if (!of_device_is_available(args.np)) {
+ framer = ERR_PTR(-ENODEV);
+ goto out_node_put;
+ }
+
+ framer = framer_of_get_from_provider(&args);
+
+out_node_put:
+ of_node_put(args.np);
+
+ return framer;
+}
+
+static struct framer *framer_of_get_byparent(struct device_node *np, int index)
+{
+ struct of_phandle_args args;
+ struct framer *framer;
+
+ args.np = of_get_parent(np);
+ args.args_count = 1;
+ args.args[0] = index;
+
+ while (args.np) {
+ framer = framer_of_get_from_provider(&args);
+ if (IS_ERR(framer) && PTR_ERR(framer) != -EPROBE_DEFER) {
+ args.np = of_get_next_parent(args.np);
+ continue;
+ }
+ of_node_put(args.np);
+ return framer;
+ }
+
+ return ERR_PTR(-ENODEV);
+}
+
+/**
+ * framer_get() - lookup and obtain a reference to a framer.
+ * @dev: device that requests the framer
+ * @con_id: name of the framer from device's point of view
+ *
+ * Returns the framer driver, after getting a refcount to it; or
+ * -ENODEV if there is no such framer. The caller is responsible for
+ * calling framer_put() to release that count.
+ */
+struct framer *framer_get(struct device *dev, const char *con_id)
+{
+ struct framer *framer = ERR_PTR(-ENODEV);
+ struct device_link *link;
+ int ret;
+
+ if (dev->of_node) {
+ if (con_id)
+ framer = framer_of_get_byphandle(dev->of_node, con_id, 0);
+ else
+ framer = framer_of_get_byparent(dev->of_node, 0);
+ }
+
+ if (IS_ERR(framer))
+ return framer;
+
+ get_device(&framer->dev);
+
+ if (!try_module_get(framer->ops->owner)) {
+ ret = -EPROBE_DEFER;
+ goto err_put_device;
+ }
+
+ link = device_link_add(dev, &framer->dev, DL_FLAG_STATELESS);
+ if (!link) {
+ dev_err(dev, "failed to create device_link to %s\n", dev_name(&framer->dev));
+ ret = -EPROBE_DEFER;
+ goto err_module_put;
+ }
+
+ return framer;
+
+err_module_put:
+ module_put(framer->ops->owner);
+err_put_device:
+ put_device(&framer->dev);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(framer_get);
+
+/**
+ * framer_put() - release the framer
+ * @dev: device that wants to release this framer
+ * @framer: the framer returned by framer_get()
+ *
+ * Releases a refcount the caller received from framer_get().
+ */
+void framer_put(struct device *dev, struct framer *framer)
+{
+ if (!framer || IS_ERR(framer))
+ return;
+
+ device_link_remove(dev, &framer->dev);
+
+ module_put(framer->ops->owner);
+ put_device(&framer->dev);
+}
+EXPORT_SYMBOL_GPL(framer_put);
+
+static void devm_framer_put(struct device *dev, void *res)
+{
+ struct framer *framer = *(struct framer **)res;
+
+ framer_put(dev, framer);
+}
+
+/**
+ * devm_framer_get() - lookup and obtain a reference to a framer.
+ * @dev: device that requests this framer
+ * @con_id: name of the framer from device's point of view
+ *
+ * Gets the framer using framer_get(), and associates a device with it using
+ * devres. On driver detach, framer_put() function is invoked on the devres
+ * data, then, devres data is freed.
+ */
+struct framer *devm_framer_get(struct device *dev, const char *con_id)
+{
+ struct framer **ptr, *framer;
+
+ ptr = devres_alloc(devm_framer_put, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ framer = framer_get(dev, con_id);
+ if (!IS_ERR(framer)) {
+ *ptr = framer;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ return framer;
+ }
+
+ return framer;
+}
+EXPORT_SYMBOL_GPL(devm_framer_get);
+
+/**
+ * devm_framer_optional_get() - lookup and obtain a reference to an optional
+ * framer.
+ * @dev: device that requests this framer
+ * @con_id: name of the framer from device's point of view
+ *
+ * Same as devm_framer_get() except that if the framer does not exist, it is not
+ * considered an error and -ENODEV will not be returned. Instead the NULL framer
+ * is returned, which can be passed to other framer consumer calls.
+ */
+struct framer *devm_framer_optional_get(struct device *dev, const char *con_id)
+{
+ struct framer *framer = devm_framer_get(dev, con_id);
+
+ if (PTR_ERR(framer) == -ENODEV)
+ framer = NULL;
+
+ return framer;
+}
+EXPORT_SYMBOL_GPL(devm_framer_optional_get);
+
+static void framer_notify_status_work(struct work_struct *work)
+{
+ struct framer *framer = container_of(work, struct framer, notify_status_work);
+
+ blocking_notifier_call_chain(&framer->notifier_list, FRAMER_EVENT_STATUS, NULL);
+}
+
+void framer_notify_status_change(struct framer *framer)
+{
+ if (!framer)
+ return;
+
+ /* Can be called from atomic context -> just schedule a task to call
+ * blocking notifiers
+ */
+ queue_work(system_power_efficient_wq, &framer->notify_status_work);
+}
+EXPORT_SYMBOL_GPL(framer_notify_status_change);
+
+/**
+ * framer_create() - create a new framer
+ * @dev: device that is creating the new framer
+ * @node: device node of the framer. default to dev->of_node.
+ * @ops: function pointers for performing framer operations
+ *
+ * Called to create a framer using framer framework.
+ */
+struct framer *framer_create(struct device *dev, struct device_node *node,
+ const struct framer_ops *ops)
+{
+ int ret;
+ int id;
+ struct framer *framer;
+
+ if (WARN_ON(!dev))
+ return ERR_PTR(-EINVAL);
+
+ /* get_status() is mandatory if the provider ask for polling status */
+ if (WARN_ON((ops->flags & FRAMER_FLAG_POLL_STATUS) && !ops->get_status))
+ return ERR_PTR(-EINVAL);
+
+ framer = kzalloc(sizeof(*framer), GFP_KERNEL);
+ if (!framer)
+ return ERR_PTR(-ENOMEM);
+
+ id = ida_simple_get(&framer_ida, 0, 0, GFP_KERNEL);
+ if (id < 0) {
+ dev_err(dev, "unable to get id\n");
+ ret = id;
+ goto free_framer;
+ }
+
+ device_initialize(&framer->dev);
+ mutex_init(&framer->mutex);
+ INIT_WORK(&framer->notify_status_work, framer_notify_status_work);
+ INIT_DELAYED_WORK(&framer->polling_work, framer_polling_work);
+ BLOCKING_INIT_NOTIFIER_HEAD(&framer->notifier_list);
+
+ framer->dev.class = framer_class;
+ framer->dev.parent = dev;
+ framer->dev.of_node = node ? node : dev->of_node;
+ framer->id = id;
+ framer->ops = ops;
+
+ ret = dev_set_name(&framer->dev, "framer-%s.%d", dev_name(dev), id);
+ if (ret)
+ goto put_dev;
+
+ /* framer-supply */
+ framer->pwr = regulator_get_optional(&framer->dev, "framer");
+ if (IS_ERR(framer->pwr)) {
+ ret = PTR_ERR(framer->pwr);
+ if (ret == -EPROBE_DEFER)
+ goto put_dev;
+
+ framer->pwr = NULL;
+ }
+
+ ret = device_add(&framer->dev);
+ if (ret)
+ goto put_dev;
+
+ if (pm_runtime_enabled(dev)) {
+ pm_runtime_enable(&framer->dev);
+ pm_runtime_no_callbacks(&framer->dev);
+ }
+
+ return framer;
+
+put_dev:
+ put_device(&framer->dev); /* calls framer_release() which frees resources */
+ return ERR_PTR(ret);
+
+free_framer:
+ kfree(framer);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(framer_create);
+
+/**
+ * framer_destroy() - destroy the framer
+ * @framer: the framer to be destroyed
+ *
+ * Called to destroy the framer.
+ */
+void framer_destroy(struct framer *framer)
+{
+ /* polling_work should already be stopped but if framer_exit() was not
+ * called (bug), here it's the last time to do that ...
+ */
+ cancel_delayed_work_sync(&framer->polling_work);
+ cancel_work_sync(&framer->notify_status_work);
+ pm_runtime_disable(&framer->dev);
+ device_unregister(&framer->dev); /* calls framer_release() which frees resources */
+}
+EXPORT_SYMBOL_GPL(framer_destroy);
+
+static void devm_framer_destroy(struct device *dev, void *res)
+{
+ struct framer *framer = *(struct framer **)res;
+
+ framer_destroy(framer);
+}
+
+/**
+ * devm_framer_create() - create a new framer
+ * @dev: device that is creating the new framer
+ * @node: device node of the framer
+ * @ops: function pointers for performing framer operations
+ *
+ * Creates a new framer device adding it to the framer class.
+ * While at that, it also associates the device with the framer using devres.
+ * On driver detach, release function is invoked on the devres data,
+ * then, devres data is freed.
+ */
+struct framer *devm_framer_create(struct device *dev, struct device_node *node,
+ const struct framer_ops *ops)
+{
+ struct framer **ptr, *framer;
+
+ ptr = devres_alloc(devm_framer_destroy, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ framer = framer_create(dev, node, ops);
+ if (!IS_ERR(framer)) {
+ *ptr = framer;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return framer;
+}
+EXPORT_SYMBOL_GPL(devm_framer_create);
+
+/**
+ * framer_provider_simple_of_xlate() - returns the framer instance from framer provider
+ * @dev: the framer provider device
+ * @args: of_phandle_args (not used here)
+ *
+ * Intended to be used by framer provider for the common case where #framer-cells is
+ * 0. For other cases where #framer-cells is greater than '0', the framer provider
+ * should provide a custom of_xlate function that reads the *args* and returns
+ * the appropriate framer.
+ */
+struct framer *framer_provider_simple_of_xlate(struct device *dev, struct of_phandle_args *args)
+{
+ struct framer *framer;
+ struct class_dev_iter iter;
+
+ class_dev_iter_init(&iter, framer_class, NULL, NULL);
+ while ((dev = class_dev_iter_next(&iter))) {
+ framer = dev_to_framer(dev);
+ if (args->np != framer->dev.of_node)
+ continue;
+
+ class_dev_iter_exit(&iter);
+ return framer;
+ }
+
+ class_dev_iter_exit(&iter);
+ return ERR_PTR(-ENODEV);
+}
+EXPORT_SYMBOL_GPL(framer_simple_of_xlate);
+
+/**
+ * __framer_provider_of_register() - create/register framer provider with the framework
+ * @dev: struct device of the framer provider
+ * @owner: the module owner containing of_xlate
+ * @of_xlate: function pointer to obtain framer instance from framer provider
+ *
+ * Creates struct framer_provider from dev and of_xlate function pointer.
+ * This is used in the case of dt boot for finding the framer instance from
+ * framer provider.
+ */
+struct framer_provider *
+__framer_provider_of_register(struct device *dev, struct module *owner,
+ struct framer *(*of_xlate)(struct device *dev,
+ struct of_phandle_args *args))
+{
+ struct framer_provider *framer_provider;
+
+ framer_provider = kzalloc(sizeof(*framer_provider), GFP_KERNEL);
+ if (!framer_provider)
+ return ERR_PTR(-ENOMEM);
+
+ framer_provider->dev = dev;
+ framer_provider->owner = owner;
+ framer_provider->of_xlate = of_xlate;
+
+ of_node_get(framer_provider->dev->of_node);
+
+ mutex_lock(&framer_provider_mutex);
+ list_add_tail(&framer_provider->list, &framer_provider_list);
+ mutex_unlock(&framer_provider_mutex);
+
+ return framer_provider;
+}
+EXPORT_SYMBOL_GPL(__framer_provider_of_register);
+
+/**
+ * framer_provider_of_unregister() - unregister framer provider from the framework
+ * @framer_provider: framer provider returned by framer_provider_of_register()
+ *
+ * Removes the framer_provider created using framer_provider_of_register().
+ */
+void framer_provider_of_unregister(struct framer_provider *framer_provider)
+{
+ if (IS_ERR(framer_provider))
+ return;
+
+ mutex_lock(&framer_provider_mutex);
+ list_del(&framer_provider->list);
+ of_node_put(framer_provider->dev->of_node);
+ kfree(framer_provider);
+ mutex_unlock(&framer_provider_mutex);
+}
+EXPORT_SYMBOL_GPL(of_framer_provider_unregister);
+
+static void devm_framer_provider_of_unregister(struct device *dev, void *res)
+{
+ struct framer_provider *framer_provider = *(struct framer_provider **)res;
+
+ framer_provider_of_unregister(framer_provider);
+}
+
+/**
+ * __devm_framer_provider_of_register() - create/register framer provider with
+ * the framework
+ * @dev: struct device of the framer provider
+ * @owner: the module owner containing of_xlate
+ * @of_xlate: function pointer to obtain framer instance from framer provider
+ *
+ * Creates struct framer_provider from dev and of_xlate function pointer.
+ * This is used in the case of dt boot for finding the framer instance from
+ * framer provider. While at that, it also associates the device with the
+ * framer provider using devres. On driver detach, release function is invoked
+ * on the devres data, then, devres data is freed.
+ */
+struct framer_provider *
+__devm_framer_provider_of_register(struct device *dev, struct module *owner,
+ struct framer *(*of_xlate)(struct device *dev,
+ struct of_phandle_args *args))
+{
+ struct framer_provider **ptr, *framer_provider;
+
+ ptr = devres_alloc(devm_framer_provider_of_unregister, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ framer_provider = __framer_provider_of_register(dev, owner, of_xlate);
+ if (!IS_ERR(framer_provider)) {
+ *ptr = framer_provider;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return framer_provider;
+}
+EXPORT_SYMBOL_GPL(__devm_framer_provider_of_register);
+
+/**
+ * framer_release() - release the framer
+ * @dev: the dev member within framer
+ *
+ * When the last reference to the device is removed, it is called
+ * from the embedded kobject as release method.
+ */
+static void framer_release(struct device *dev)
+{
+ struct framer *framer;
+
+ framer = dev_to_framer(dev);
+ regulator_put(framer->pwr);
+ ida_simple_remove(&framer_ida, framer->id);
+ kfree(framer);
+}
+
+static int __init framer_core_init(void)
+{
+ framer_class = class_create("framer");
+ if (IS_ERR(framer_class)) {
+ pr_err("failed to create framer class (%pe)\n", framer_class);
+ return PTR_ERR(framer_class);
+ }
+
+ framer_class->dev_release = framer_release;
+
+ return 0;
+}
+device_initcall(framer_core_init);
diff --git a/include/linux/framer/framer-provider.h b/include/linux/framer/framer-provider.h
new file mode 100644
index 000000000000..941a343c3ba7
--- /dev/null
+++ b/include/linux/framer/framer-provider.h
@@ -0,0 +1,194 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Generic framer profider header file
+ *
+ * Copyright 2023 CS GROUP France
+ *
+ * Author: Herve Codina <herve.codina@bootlin.com>
+ */
+
+#ifndef __DRIVERS_PROVIDER_FRAMER_H
+#define __DRIVERS_PROVIDER_FRAMER_H
+
+#include <linux/export.h>
+#include <linux/framer/framer.h>
+#include <linux/types.h>
+
+#define FRAMER_FLAG_POLL_STATUS BIT(0)
+
+/**
+ * struct framer_ops - set of function pointers for performing framer operations
+ * @init: operation to be performed for initializing the framer
+ * @exit: operation to be performed while exiting
+ * @power_on: powering on the framer
+ * @power_off: powering off the framer
+ * @flags: OR-ed flags (FRAMER_FLAG_*) to ask for core functionality
+ * - @FRAMER_FLAG_POLL_STATUS:
+ * Ask the core to perfom a polling to get the framer status and
+ * notify consumers on change.
+ * The framer should call @framer_notify_status_change() when it
+ * detects a status change. This is usally done using interrutps.
+ * If the framer cannot detect this change, it can ask the core for
+ * a status polling. The core will call @get_status() periodically
+ * and, on change detected, it will notify the consumer.
+ * the @get_status()
+ * @owner: the module owner containing the ops
+ */
+struct framer_ops {
+ int (*init)(struct framer *framer);
+ void (*exit)(struct framer *framer);
+ int (*power_on)(struct framer *framer);
+ int (*power_off)(struct framer *framer);
+
+ /**
+ * @get_status:
+ *
+ * Optional.
+ *
+ * Used to get the framer status. framer_init() must have
+ * been called on the framer.
+ *
+ * Returns: 0 if successful, an negative error code otherwise
+ */
+ int (*get_status)(struct framer *framer, struct framer_status *status);
+
+ /**
+ * @set_config:
+ *
+ * Optional.
+ *
+ * Used to set the framer configuration. framer_init() must have
+ * been called on the framer.
+ *
+ * Returns: 0 if successful, an negative error code otherwise
+ */
+ int (*set_config)(struct framer *framer, const struct framer_config *config);
+
+ /**
+ * @get_config:
+ *
+ * Optional.
+ *
+ * Used to get the framer configuration. framer_init() must have
+ * been called on the framer.
+ *
+ * Returns: 0 if successful, an negative error code otherwise
+ */
+ int (*get_config)(struct framer *framer, struct framer_config *config);
+
+ u32 flags;
+ struct module *owner;
+};
+
+/**
+ * struct framer_provider - represents the framer provider
+ * @dev: framer provider device
+ * @children: can be used to override the default (dev->of_node) child node
+ * @owner: the module owner having of_xlate
+ * @list: to maintain a linked list of framer providers
+ * @of_xlate: function pointer to obtain framer instance from framer pointer
+ */
+struct framer_provider {
+ struct device *dev;
+ struct module *owner;
+ struct list_head list;
+ struct framer * (*of_xlate)(struct device *dev,
+ struct of_phandle_args *args);
+};
+
+static inline void framer_set_drvdata(struct framer *framer, void *data)
+{
+ dev_set_drvdata(&framer->dev, data);
+}
+
+static inline void *framer_get_drvdata(struct framer *framer)
+{
+ return dev_get_drvdata(&framer->dev);
+}
+
+#if IS_ENABLED(CONFIG_GENERIC_FRAMER)
+
+/* Create and destroy a framer */
+struct framer *framer_create(struct device *dev, struct device_node *node,
+ const struct framer_ops *ops);
+void framer_destroy(struct framer *framer);
+
+/* devm version */
+struct framer *devm_framer_create(struct device *dev, struct device_node *node,
+ const struct framer_ops *ops);
+
+struct framer *framer_provider_simple_of_xlate(struct device *dev,
+ struct of_phandle_args *args);
+
+struct framer_provider *
+__framer_provider_of_register(struct device *dev, struct module *owner,
+ struct framer *(*of_xlate)(struct device *dev,
+ struct of_phandle_args *args));
+
+void framer_provider_of_unregister(struct framer_provider *framer_provider);
+
+struct framer_provider *
+__devm_framer_provider_of_register(struct device *dev, struct module *owner,
+ struct framer *(*of_xlate)(struct device *dev,
+ struct of_phandle_args *args));
+
+void framer_notify_status_change(struct framer *framer);
+
+#else /* IS_ENABLED(CONFIG_GENERIC_FRAMER) */
+
+static inline struct framer *framer_create(struct device *dev, struct device_node *node,
+ const struct framer_ops *ops)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+static inline void framer_destroy(struct framer *framer)
+{
+}
+
+/* devm version */
+static inline struct framer *devm_framer_create(struct device *dev, struct device_node *node,
+ const struct framer_ops *ops)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+static inline struct framer *framer_provider_simple_of_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+static inline struct framer_provider *
+__framer_provider_of_register(struct device *dev, struct module *owner,
+ struct framer *(*of_xlate)(struct device *dev,
+ struct of_phandle_args *args))
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+void framer_provider_of_unregister(struct framer_provider *framer_provider)
+{
+}
+
+static inline struct framer_provider *
+__devm_framer_provider_of_register(struct device *dev, struct module *owner,
+ struct framer *(*of_xlate)(struct device *dev,
+ struct of_phandle_args *args))
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+void framer_notify_status_change(struct framer *framer)
+{
+}
+
+#endif /* IS_ENABLED(CONFIG_GENERIC_FRAMER) */
+
+#define framer_provider_of_register(dev, xlate) \
+ __framer_provider_of_register((dev), THIS_MODULE, (xlate))
+
+#define devm_framer_provider_of_register(dev, xlate) \
+ __devm_framer_provider_of_register((dev), THIS_MODULE, (xlate))
+
+#endif /* __DRIVERS_PROVIDER_FRAMER_H */
diff --git a/include/linux/framer/framer.h b/include/linux/framer/framer.h
new file mode 100644
index 000000000000..b735027f6801
--- /dev/null
+++ b/include/linux/framer/framer.h
@@ -0,0 +1,215 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Generic framer header file
+ *
+ * Copyright 2023 CS GROUP France
+ *
+ * Author: Herve Codina <herve.codina@bootlin.com>
+ */
+
+#ifndef __DRIVERS_FRAMER_H
+#define __DRIVERS_FRAMER_H
+
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+
+/**
+ * enum framer_iface - Framer interface
+ */
+enum framer_iface {
+ FRAMER_IFACE_E1, /* E1 interface */
+ FRAMER_IFACE_T1, /* T1 interface */
+};
+
+/**
+ * enum framer_clock_mode - Framer clock mode
+ */
+enum framer_clock_type {
+ FRAMER_CLOCK_EXT, /* External clock */
+ FRAMER_CLOCK_INT, /* Internal clock */
+};
+
+/**
+ * struct framer_configuration - Framer configuration
+ * @line_iface: Framer line interface
+ * @clock_mode: Framer clock type
+ * @clock_rate: Framer clock rate
+ */
+struct framer_config {
+ enum framer_iface iface;
+ enum framer_clock_type clock_type;
+ unsigned long line_clock_rate;
+};
+
+/**
+ * struct framer_status - Framer status
+ * @link_is_on: Framer link state. true, the link is on, false, the link is off.
+ */
+struct framer_status {
+ bool link_is_on;
+};
+
+/**
+ * framer_event - event available for notification
+ */
+enum framer_event {
+ FRAMER_EVENT_STATUS, /* Event notified on framer_status changes */
+};
+
+/**
+ * struct framer - represents the framer device
+ * @dev: framer device
+ * @id: id of the framer device
+ * @ops: function pointers for performing framer operations
+ * @mutex: mutex to protect framer_ops
+ * @init_count: used to protect when the framer is used by multiple consumers
+ * @power_count: used to protect when the framer is used by multiple consumers
+ * @pwr: power regulator associated with the framer
+ * @polling_task: polling task used if framer notifier operations are not provided
+ * @polling_notifier_list: notifier list used by the polling task
+ * @prev_status: previous read status used by the polling task to detect changes
+ */
+struct framer {
+ struct device dev;
+ int id;
+ const struct framer_ops *ops;
+ struct mutex mutex; /* Protect framer */
+ int init_count;
+ int power_count;
+ struct regulator *pwr;
+ struct work_struct notify_status_work;
+ struct blocking_notifier_head notifier_list;
+ struct delayed_work polling_work;
+ struct framer_status prev_status;
+};
+
+#if IS_ENABLED(CONFIG_GENERIC_FRAMER)
+int framer_pm_runtime_get(struct framer *framer);
+int framer_pm_runtime_get_sync(struct framer *framer);
+int framer_pm_runtime_put(struct framer *framer);
+int framer_pm_runtime_put_sync(struct framer *framer);
+int framer_init(struct framer *framer);
+int framer_exit(struct framer *framer);
+int framer_power_on(struct framer *framer);
+int framer_power_off(struct framer *framer);
+int framer_get_status(struct framer *framer, struct framer_status *status);
+int framer_get_config(struct framer *framer, struct framer_config *config);
+int framer_set_config(struct framer *framer, const struct framer_config *config);
+int framer_notifier_register(struct framer *framer, struct notifier_block *nb);
+int framer_notifier_unregister(struct framer *framer, struct notifier_block *nb);
+
+struct framer *framer_get(struct device *dev, const char *con_id);
+void framer_put(struct device *dev, struct framer *framer);
+
+struct framer *devm_framer_get(struct device *dev, const char *con_id);
+struct framer *devm_framer_optional_get(struct device *dev, const char *con_id);
+#else
+static inline int framer_pm_runtime_get(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_pm_runtime_get_sync(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_pm_runtime_put(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_pm_runtime_put_sync(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_init(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_exit(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_power_on(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_power_off(struct framer *framer)
+{
+ if (!framer)
+ return 0;
+ return -ENOSYS;
+}
+
+static inline int framer_get_status(struct framer *framer, struct framer_status *status)
+{
+ return -ENOSYS;
+}
+
+static inline int framer_get_config(struct framer *framer, struct framer_config *config)
+{
+ return -ENOSYS;
+}
+
+static inline int framer_set_config(struct framer *framer, const struct framer_config *config)
+{
+ if (!framer)
+ return 0;
+
+ return -ENOSYS;
+}
+
+static inline int framer_notifier_register(struct framer *framer,
+ struct notifier_block *nb)
+{
+ if (!framer)
+ return 0;
+
+ return -ENOSYS;
+}
+
+static inline int framer_notifier_unregister(struct framer *framer,
+ struct notifier_block *nb)
+{
+ if (!framer)
+ return 0;
+
+ return -ENOSYS;
+}
+
+static inline struct framer *devm_framer_get(struct device *dev, const char *con_id)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
+static inline struct framer *devm_framer_optional_get(struct device *dev, const char *con_id)
+{
+ return NULL;
+}
+
+#endif
+
+#endif /* __DRIVERS_FRAMER_H */
--
2.41.0