#ifndef _ACI_H_
#define _ACI_H_
extern int aci_port;
extern int aci_version; /* ACI firmware version */
extern int aci_rw_cmd(int write1, int write2, int write3);
#define aci_indexed_cmd(a, b) aci_rw_cmd(a, b, -1)
#define aci_write_cmd(a, b) aci_rw_cmd(a, b, -1)
#define aci_read_cmd(a) aci_rw_cmd(a,-1, -1)
#define COMMAND_REGISTER (aci_port) /* write register */
#define STATUS_REGISTER (aci_port + 1) /* read register */
#define BUSY_REGISTER (aci_port + 2) /* also used for rds */
#define RDS_REGISTER BUSY_REGISTER
#define ACI_SET_MUTE 0x0d
#define ACI_SET_POWERAMP 0x0f
#define ACI_SET_TUNERMUTE 0xa3
#define ACI_SET_TUNERMONO 0xa4
#define ACI_SET_IDE 0xd0
#define ACI_SET_WSS 0xd1
#define ACI_SET_SOLOMODE 0xd2
#define ACI_WRITE_IGAIN 0x03
#define ACI_WRITE_TUNE 0xa7
#define ACI_READ_TUNERSTEREO 0xa8
#define ACI_READ_TUNERSTATION 0xa9
#define ACI_READ_VERSION 0xf1
#define ACI_READ_IDCODE 0xf2
#define ACI_INIT 0xff
#define ACI_STATUS 0xf0
#define ACI_S_GENERAL 0x00
#define ACI_S_READ_IGAIN 0x21
#define ACI_ERROR_OP 0xdf
/*
* The following macro SCALE can be used to scale one integer volume
* value into another one using only integer arithmetic. If the input
* value x is in the range 0 <= x <= xmax, then the result will be in
* the range 0 <= SCALE(xmax,ymax,x) <= ymax.
*
* This macro has for all xmax, ymax > 0 and all 0 <= x <= xmax the
* following nice properties:
*
* - SCALE(xmax,ymax,xmax) = ymax
* - SCALE(xmax,ymax,0) = 0
* - SCALE(xmax,ymax,SCALE(ymax,xmax,SCALE(xmax,ymax,x))) = SCALE(xmax,ymax,x)
*
* In addition, the rounding error is minimal and nicely distributed.
* The proofs are left as an exercise to the reader.
*/
#define SCALE(xmax,ymax,x) (((x)*(ymax)+(xmax)/2)/(xmax))
#endif /* _ACI_H_ */
