include/acpi/pcc.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * PCC (Platform Communications Channel) methods
   4  */
   5
   6 #ifndef _PCC_H
   7 #define _PCC_H
   8
   9 #include <linux/mailbox_controller.h>
  10 #include <linux/mailbox_client.h>
  11
  12 #define MAX_PCC_SUBSPACES       256
  13 #ifdef CONFIG_PCC
  14 extern struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
  15                                                   int subspace_id);
  16 extern void pcc_mbox_free_channel(struct mbox_chan *chan);
  17 #else
  18 static inline struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl,
  19                                                          int subspace_id)
  20 {
  21         return ERR_PTR(-ENODEV);
  22 }
  23 static inline void pcc_mbox_free_channel(struct mbox_chan *chan) { }
  24 #endif
  25
  26 #endif /* _PCC_H */