402 lines
11 KiB
C
402 lines
11 KiB
C
/* This file contains the driver for the mixer on
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* a SoundBlaster 16 soundcard.
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*
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* The driver supports the following operations (using message format m2):
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*
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* m_type DEVICE IO_ENDPT COUNT POSITION ADRRESS
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* ----------------------------------------------------------------
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* | DEV_OPEN | device | proc nr | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_CLOSE | device | proc nr | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_IOCTL | device | proc nr |func code| | buf_ptr |
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* ----------------------------------------------------------------
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*
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* The file contains one entry point:
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*
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* sb16mixer_task: main entry when system is brought up
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*
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* August 24 2005 Ported driver to user space (Peter Boonstoppel)
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* May 20 1995 Author: Michel R. Prevenier
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*/
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#include "sb16.h"
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_PROTOTYPE(void main, (void));
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FORWARD _PROTOTYPE( int mixer_init, (void));
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FORWARD _PROTOTYPE( int mixer_open, (message *m_ptr));
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FORWARD _PROTOTYPE( int mixer_close, (message *m_ptr));
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FORWARD _PROTOTYPE( int mixer_ioctl, (message *m_ptr));
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FORWARD _PROTOTYPE( int mixer_get, (int reg));
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FORWARD _PROTOTYPE( int get_set_volume, (message *m_ptr, int flag));
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FORWARD _PROTOTYPE( int get_set_input, (message *m_ptr, int flag, int channel));
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FORWARD _PROTOTYPE( int get_set_output, (message *m_ptr, int flag));
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PRIVATE int mixer_avail = 0; /* Mixer exists? */
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#define dprint (void)
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/* SEF functions and variables. */
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FORWARD _PROTOTYPE( void sef_local_startup, (void) );
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/*===========================================================================*
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* main
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*===========================================================================*/
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PUBLIC void main() {
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message mess;
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int err, caller, proc_nr;
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/* SEF local startup. */
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sef_local_startup();
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/* Here is the main loop of the mixer task. It waits for a message, carries
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* it out, and sends a reply.
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*/
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while (TRUE) {
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sef_receive(ANY, &mess);
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caller = mess.m_source;
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proc_nr = mess.IO_ENDPT;
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switch (caller) {
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case HARDWARE: /* Leftover interrupt. */
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continue;
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case FS_PROC_NR: /* The only legitimate caller. */
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break;
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default:
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dprint("sb16: got message from %d\n", caller);
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continue;
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}
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/* Now carry out the work. */
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switch(mess.m_type) {
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case DEV_OPEN: err = mixer_open(&mess); break;
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case DEV_CLOSE: err = mixer_close(&mess); break;
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#ifdef DEV_IOCTL
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case DEV_IOCTL: err = mixer_ioctl(&mess); break;
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#endif
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default: err = EINVAL; break;
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}
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/* Finally, prepare and send the reply message. */
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mess.m_type = TASK_REPLY;
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mess.REP_ENDPT = proc_nr;
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dprint("%d %d", err, OK);
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mess.REP_STATUS = err; /* error code */
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send(caller, &mess); /* send reply to caller */
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}
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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PRIVATE void sef_local_startup()
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{
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/* Register live update callbacks. */
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sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
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sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
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/* Let SEF perform startup. */
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sef_startup();
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}
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/*=========================================================================*
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* mixer_open
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*=========================================================================*/
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PRIVATE int mixer_open(message *m_ptr)
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{
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dprint("mixer_open\n");
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/* try to detect the mixer type */
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if (!mixer_avail && mixer_init() != OK) return EIO;
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return OK;
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}
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/*=========================================================================*
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* mixer_close
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*=========================================================================*/
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PRIVATE int mixer_close(message *m_ptr)
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{
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dprint("mixer_close\n");
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return OK;
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}
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/*=========================================================================*
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* mixer_ioctl
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*=========================================================================*/
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PRIVATE int mixer_ioctl(message *m_ptr)
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{
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int status;
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dprint("mixer: got ioctl %d\n", m_ptr->REQUEST);
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switch(m_ptr->REQUEST) {
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case MIXIOGETVOLUME: status = get_set_volume(m_ptr, 0); break;
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case MIXIOSETVOLUME: status = get_set_volume(m_ptr, 1); break;
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case MIXIOGETINPUTLEFT: status = get_set_input(m_ptr, 0, 0); break;
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case MIXIOGETINPUTRIGHT: status = get_set_input(m_ptr, 0, 1); break;
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case MIXIOGETOUTPUT: status = get_set_output(m_ptr, 0); break;
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case MIXIOSETINPUTLEFT: status = get_set_input(m_ptr, 1, 0); break;
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case MIXIOSETINPUTRIGHT: status = get_set_input(m_ptr, 1, 1); break;
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case MIXIOSETOUTPUT: status = get_set_output(m_ptr, 1); break;
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default: status = ENOTTY;
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}
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return status;
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}
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/*=========================================================================*
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* mixer_init
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*=========================================================================*/
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PRIVATE int mixer_init()
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{
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/* Try to detect the mixer by writing to MIXER_DAC_LEVEL if the
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* value written can be read back the mixer is there
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*/
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mixer_set(MIXER_DAC_LEVEL, 0x10); /* write something to it */
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if(mixer_get(MIXER_DAC_LEVEL) != 0x10) {
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dprint("sb16: Mixer not detected\n");
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return EIO;
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}
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/* Enable Automatic Gain Control */
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mixer_set(MIXER_AGC, 0x01);
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dprint("Mixer detected\n");
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mixer_avail = 1;
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return OK;
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}
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/*=========================================================================*
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* mixer_get
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*=========================================================================*/
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PRIVATE int mixer_get(int reg)
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{
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int i;
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sb16_outb(MIXER_REG, reg);
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for(i = 0; i < 100; i++);
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return sb16_inb(MIXER_DATA) & 0xff;
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}
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/*=========================================================================*
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* get_set_volume *
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*=========================================================================*/
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PRIVATE int get_set_volume(message *m_ptr, int flag)
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/* flag 0 = get, 1 = set */
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{
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phys_bytes user_phys;
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struct volume_level level;
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int cmd_left, cmd_right, shift, max_level;
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sys_datacopy(m_ptr->IO_ENDPT, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)&level, (phys_bytes)sizeof(level));
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shift = 3;
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max_level = 0x1F;
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switch(level.device) {
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case Master:
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cmd_left = MIXER_MASTER_LEFT;
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cmd_right = MIXER_MASTER_RIGHT;
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break;
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case Dac:
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cmd_left = MIXER_DAC_LEFT;
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cmd_right = MIXER_DAC_RIGHT;
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break;
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case Fm:
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cmd_left = MIXER_FM_LEFT;
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cmd_right = MIXER_FM_RIGHT;
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break;
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case Cd:
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cmd_left = MIXER_CD_LEFT;
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cmd_right = MIXER_CD_RIGHT;
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break;
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case Line:
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cmd_left = MIXER_LINE_LEFT;
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cmd_right = MIXER_LINE_RIGHT;
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break;
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case Mic:
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cmd_left = cmd_right = MIXER_MIC_LEVEL;
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break;
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case Speaker:
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cmd_left = cmd_right = MIXER_PC_LEVEL;
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shift = 6;
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max_level = 0x03;
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break;
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case Treble:
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cmd_left = MIXER_TREBLE_LEFT;
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cmd_right = MIXER_TREBLE_RIGHT;
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shift = 4;
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max_level = 0x0F;
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break;
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case Bass:
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cmd_left = MIXER_BASS_LEFT;
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cmd_right = MIXER_BASS_RIGHT;
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shift = 4;
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max_level = 0x0F;
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break;
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default:
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return EINVAL;
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}
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if(flag) { /* Set volume level */
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if(level.right < 0) level.right = 0;
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else if(level.right > max_level) level.right = max_level;
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if(level.left < 0) level.left = 0;
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else if(level.left > max_level) level.left = max_level;
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mixer_set(cmd_right, (level.right << shift));
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mixer_set(cmd_left, (level.left << shift));
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} else { /* Get volume level */
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level.left = mixer_get(cmd_left);
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level.right = mixer_get(cmd_right);
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level.left >>= shift;
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level.right >>= shift;
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/* Copy back to user */
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sys_datacopy(SELF, (vir_bytes)&level, m_ptr->IO_ENDPT, (vir_bytes)m_ptr->ADDRESS, (phys_bytes)sizeof(level));
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}
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return OK;
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}
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/*=========================================================================*
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* get_set_input *
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*=========================================================================*/
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PRIVATE int get_set_input(message *m_ptr, int flag, int channel)
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/*
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* flag 0 = get, 1 = set
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* channel 0 = left, 1 = right
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*/
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{
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phys_bytes user_phys;
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struct inout_ctrl input;
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int input_cmd, input_mask, mask, del_mask, shift;
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sys_datacopy(m_ptr->IO_ENDPT, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)&input, (phys_bytes)sizeof(input));
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input_cmd = (channel == 0 ? MIXER_IN_LEFT : MIXER_IN_RIGHT);
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mask = mixer_get(input_cmd);
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switch (input.device) {
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case Fm:
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shift = 5;
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del_mask = 0x1F;
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break;
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case Cd:
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shift = 1;
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del_mask = 0x79;
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break;
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case Line:
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shift = 3;
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del_mask = 0x67;
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break;
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case Mic:
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shift = 0;
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del_mask = 0x7E;
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break;
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default:
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return EINVAL;
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}
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if (flag) { /* Set input */
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input_mask = ((input.left == ON ? 1 : 0) << 1) | (input.right == ON ? 1 : 0);
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if (shift > 0) input_mask <<= shift;
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else input_mask >>= 1;
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mask &= del_mask;
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mask |= input_mask;
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mixer_set(input_cmd, mask);
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} else { /* Get input */
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if (shift > 0) {
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input.left = ((mask >> (shift+1)) & 1 == 1 ? ON : OFF);
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input.right = ((mask >> shift) & 1 == 1 ? ON : OFF);
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} else {
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input.left = ((mask & 1) == 1 ? ON : OFF);
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}
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/* Copy back to user */
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sys_datacopy(SELF, (vir_bytes)&input, m_ptr->IO_ENDPT, (vir_bytes)m_ptr->ADDRESS, (phys_bytes)sizeof(input));
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}
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return OK;
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}
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/*=========================================================================*
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* get_set_output *
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*=========================================================================*/
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PRIVATE int get_set_output(message *m_ptr, int flag)
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/* flag 0 = get, 1 = set */
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{
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phys_bytes user_phys;
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struct inout_ctrl output;
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int output_mask, mask, del_mask, shift;
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sys_datacopy(m_ptr->IO_ENDPT, (vir_bytes)m_ptr->ADDRESS, SELF, (vir_bytes)&output, (phys_bytes)sizeof(output));
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mask = mixer_get(MIXER_OUTPUT_CTRL);
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switch (output.device) {
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case Cd:
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shift = 1;
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del_mask = 0x79;
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break;
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case Line:
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shift = 3;
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del_mask = 0x67;
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break;
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case Mic:
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shift = 0;
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del_mask = 0x7E;
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break;
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default:
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return EINVAL;
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}
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if (flag) { /* Set input */
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output_mask = ((output.left == ON ? 1 : 0) << 1) | (output.right == ON ? 1 : 0);
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if (shift > 0) output_mask <<= shift;
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else output_mask >>= 1;
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mask &= del_mask;
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mask |= output_mask;
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mixer_set(MIXER_OUTPUT_CTRL, mask);
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} else { /* Get input */
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if (shift > 0) {
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output.left = ((mask >> (shift+1)) & 1 == 1 ? ON : OFF);
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output.right = ((mask >> shift) & 1 == 1 ? ON : OFF);
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} else {
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output.left = ((mask & 1) == 1 ? ON : OFF);
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}
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/* Copy back to user */
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sys_datacopy(SELF, (vir_bytes)&output, m_ptr->IO_ENDPT, (vir_bytes)m_ptr->ADDRESS, (phys_bytes)sizeof(output));
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}
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return OK;
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}
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