firmware: arm_scmi: Introduce devres get/put protocols operations

Expose to the SCMI drivers a new devres managed common protocols API
based on generic get/put methods and protocol handles.

All drivers still keep using the old API, no functional change.

Link: https://lore.kernel.org/r/20210316124903.35011-4-cristian.marussi@arm.com
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index b6f1a28..5a960a7 100644 (file)
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -15,6 +15,7 @@
  */
 
 #include <linux/bitmap.h>
+#include <linux/device.h>
 #include <linux/export.h>
 #include <linux/idr.h>
 #include <linux/io.h>
@@ -755,6 +756,95 @@ scmi_is_protocol_implemented(const struct scmi_handle *handle, u8 prot_id)
        return false;
 }
 
+struct scmi_protocol_devres {
+       struct scmi_handle *handle;
+       u8 protocol_id;
+};
+
+static void scmi_devm_release_protocol(struct device *dev, void *res)
+{
+       struct scmi_protocol_devres *dres = res;
+
+       scmi_protocol_release(dres->handle, dres->protocol_id);
+}
+
+/**
+ * scmi_devm_protocol_get  - Devres managed get protocol operations and handle
+ * @sdev: A reference to an scmi_device whose embedded struct device is to
+ *       be used for devres accounting.
+ * @protocol_id: The protocol being requested.
+ * @ph: A pointer reference used to pass back the associated protocol handle.
+ *
+ * Get hold of a protocol accounting for its usage, eventually triggering its
+ * initialization, and returning the protocol specific operations and related
+ * protocol handle which will be used as first argument in most of the
+ * protocols operations methods.
+ * Being a devres based managed method, protocol hold will be automatically
+ * released, and possibly de-initialized on last user, once the SCMI driver
+ * owning the scmi_device is unbound from it.
+ *
+ * Return: A reference to the requested protocol operations or error.
+ *        Must be checked for errors by caller.
+ */
+static const void __must_check *
+scmi_devm_protocol_get(struct scmi_device *sdev, u8 protocol_id,
+                      struct scmi_protocol_handle **ph)
+{
+       struct scmi_protocol_instance *pi;
+       struct scmi_protocol_devres *dres;
+       struct scmi_handle *handle = sdev->handle;
+
+       if (!ph)
+               return ERR_PTR(-EINVAL);
+
+       dres = devres_alloc(scmi_devm_release_protocol,
+                           sizeof(*dres), GFP_KERNEL);
+       if (!dres)
+               return ERR_PTR(-ENOMEM);
+
+       pi = scmi_get_protocol_instance(handle, protocol_id);
+       if (IS_ERR(pi)) {
+               devres_free(dres);
+               return pi;
+       }
+
+       dres->handle = handle;
+       dres->protocol_id = protocol_id;
+       devres_add(&sdev->dev, dres);
+
+       *ph = &pi->ph;
+
+       return pi->proto->ops;
+}
+
+static int scmi_devm_protocol_match(struct device *dev, void *res, void *data)
+{
+       struct scmi_protocol_devres *dres = res;
+
+       if (WARN_ON(!dres || !data))
+               return 0;
+
+       return dres->protocol_id == *((u8 *)data);
+}
+
+/**
+ * scmi_devm_protocol_put  - Devres managed put protocol operations and handle
+ * @sdev: A reference to an scmi_device whose embedded struct device is to
+ *       be used for devres accounting.
+ * @protocol_id: The protocol being requested.
+ *
+ * Explicitly release a protocol hold previously obtained calling the above
+ * @scmi_devm_protocol_get.
+ */
+static void scmi_devm_protocol_put(struct scmi_device *sdev, u8 protocol_id)
+{
+       int ret;
+
+       ret = devres_release(&sdev->dev, scmi_devm_release_protocol,
+                            scmi_devm_protocol_match, &protocol_id);
+       WARN_ON(ret);
+}
+
 /**
  * scmi_handle_get() - Get the SCMI handle for a device
  *
@@ -1009,6 +1099,8 @@ static int scmi_probe(struct platform_device *pdev)
        handle = &info->handle;
        handle->dev = info->dev;
        handle->version = &info->version;
+       handle->devm_protocol_get = scmi_devm_protocol_get;
+       handle->devm_protocol_put = scmi_devm_protocol_put;
 
        ret = scmi_txrx_setup(info, dev, SCMI_PROTOCOL_BASE);
        if (ret)

diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index ea301c5..a9becd3 100644 (file)
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -57,6 +57,8 @@ struct scmi_clock_info {
 };
 
 struct scmi_handle;
+struct scmi_device;
+struct scmi_protocol_handle;
 
 /**
  * struct scmi_clk_ops - represents the various operations provided
@@ -593,6 +595,9 @@ struct scmi_notify_ops {
  * @sensor_ops: pointer to set of sensor protocol operations
  * @reset_ops: pointer to set of reset protocol operations
  * @voltage_ops: pointer to set of voltage protocol operations
+ * @devm_protocol_get: devres managed method to acquire a protocol and get specific
+ *                    operations and a dedicated protocol handler
+ * @devm_protocol_put: devres managed method to release a protocol
  * @notify_ops: pointer to set of notifications related operations
  * @perf_priv: pointer to private data structure specific to performance
  *     protocol(for internal use only)
@@ -618,6 +623,12 @@ struct scmi_handle {
        const struct scmi_sensor_ops *sensor_ops;
        const struct scmi_reset_ops *reset_ops;
        const struct scmi_voltage_ops *voltage_ops;
+
+       const void __must_check *
+               (*devm_protocol_get)(struct scmi_device *sdev, u8 proto,
+                                    struct scmi_protocol_handle **ph);
+       void (*devm_protocol_put)(struct scmi_device *sdev, u8 proto);
+
        const struct scmi_notify_ops *notify_ops;
        /* for protocol internal use */
        void *perf_priv;