i2s: add i2s_configure() as a system call

Now that k_mem_slabs are tracked as kernel objects,
even though they have no user facing API, we can now
accept a pointer to one in the configure API.

Signed-off-by: Andrew Boie <[email protected]>

Author: Andrew Boie

drivers/i2s/i2s_handlers.c

@@ -8,6 +8,38 @@
 #include <syscall_handler.h>
 #include <i2s.h>
 
+
+Z_SYSCALL_HANDLER(i2s_configure, dev, dir, cfg_ptr)
+{
+	struct i2s_config config;
+	int ret = -EINVAL;
+
+	if (Z_SYSCALL_DRIVER_I2S(dev, configure)) {
+		goto out;
+	}
+
+	Z_OOPS(z_user_from_copy(&config, (void *)cfg_ptr,
+				sizeof(struct i2s_config)));
+
+	/* Check that the k_mem_slab provided is a valid pointer and that
+	 * the caller has permission on it
+	 */
+	if (Z_SYSCALL_OBJ(config.mem_slab, K_OBJ_MEM_SLAB)) {
+		goto out;
+	}
+
+	/* Ensure that the k_mem_slab's slabs are large enough for the
+	 * specified block size
+	 */
+	if (config.block_size > config.mem_slab->block_size) {
+		goto out;
+	}
+
+	ret = _impl_i2s_configure((struct device *)dev, dir, &config);
+out:
+	return ret;
+}
+
 Z_SYSCALL_HANDLER(i2s_buf_read, dev, buf, size)
 {
 	void *mem_block;

include/i2s.h

@@ -346,8 +346,11 @@ struct i2s_driver_api {
  * @retval 0 If successful.
  * @retval -EINVAL Invalid argument.
  */
-static inline int i2s_configure(struct device *dev, enum i2s_dir dir,
-				struct i2s_config *cfg)
+__syscall int i2s_configure(struct device *dev, enum i2s_dir dir,
+			    struct i2s_config *cfg);
+
+static inline int _impl_i2s_configure(struct device *dev, enum i2s_dir dir,
+				      struct i2s_config *cfg)
 {
 	const struct i2s_driver_api *api = dev->driver_api;