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Subject[patch] ess maestro, support for hardware volume control
Hi,


this patch applies to (at least) 2.4.3 up to and including 2.4.6-pre2.
It enables the hardware volume control feature of the maestro.
By giving hwv=0 to insmod one can explicitly disable it. Setting
hwv_input=1 requests the alternative HWV input pins to be used.

The maestro will generate interrupts on an input signal with bit 6 at
iobase+0x1A set. This case was already tested for, but
a) nothing was done there and
b) this event never occurred anyway b/c the irq was turned off.
Now the master volume counter is read out and the mixer's
master volume is changed accordingly.



regards,
lukas



--- linux-2.4.6-pre2/drivers/sound/maestro.c Sat Jun 9 16:55:22 2001
+++ linux/drivers/sound/maestro.c Sat Jun 9 17:13:24 2001
@@ -115,6 +115,10 @@
* themselves, but we'll see.
*
* History
+ * v0.15 - Jun 09 2001 - Lukas Schroeder <lukas@edeal.de>
+ * enable hardware volume control (by default)
+ * add hwv= to allow disabling of HWV (values are 0 or 1)
+ * add hwv_input= to allow selecting the HWV input pins (values are 0 or 1)
* (still kind of v0.14) Nov 23 - Alan Cox <alan@redhat.com>
* Add clocking= for people with seriously warped hardware
* (still v0.14) Nov 10 2000 - Bartlomiej Zolnierkiewicz <bkz@linux-ide.org>
@@ -269,8 +273,13 @@

static int clocking=48000;

+/* enable hardware volume control? */
+static int hwv = 1;
+/* hardware volume input pin selection */
+static int hwv_input = 0;
+
/* --------------------------------------------------------------------- */
-#define DRIVER_VERSION "0.14"
+#define DRIVER_VERSION "0.15"

#ifndef PCI_VENDOR_ESS
#define PCI_VENDOR_ESS 0x125D
@@ -312,6 +321,9 @@
#define NR_APUS 64
#define NR_APU_REGS 16

+/* steps per hardware volume count */
+#define HWV_MIXER_STEP 15
+
/* acpi states */
enum {
ACPI_D0=0,
@@ -514,6 +526,7 @@

/* --------------------------------------------------------------------- */

+static void set_mixer(struct ess_card *card,unsigned int mixer, unsigned int val ) ;
static void check_suspend(struct ess_card *card);

static struct ess_card *devs = NULL;
@@ -1898,10 +1911,18 @@

if(event&(1<<6))
{
- /* XXX if we have a hw volume control int enable
- all the ints? doesn't make sense.. */
+ unsigned int val;
+
event = inw(c->iobase+0x18);
- outb(0xFF, c->iobase+0x1A);
+ outb((1<<6), c->iobase+0x1A);
+
+ /* read the HW Master Volume Counter
+ Bits 7:5 Master Volume Left
+ Bits 3:1 Master Volume Right
+ */
+ i = inb(c->iobase+0x1f);
+ val = ((HWV_MIXER_STEP * ((i>>1) & 7)) << 8) | HWV_MIXER_STEP * ((i>>5) & 7);
+ set_mixer(c, 0, val);
}
else
{
@@ -3088,8 +3109,10 @@
w&=~(1<<14); /* External clock */

w&=~(1<<7); /* HWV off */
+ if (hwv) w|=(1<<7);
w&=~(1<<6); /* Debounce off */
- w&=~(1<<5); /* GPIO 4:5 */
+ w&=~(1<<5); /* GPIO 4:5 ; HVI pin selection */
+ if (hwv_input) w|=(1<<5);
w|= (1<<4); /* Disconnect from the CHI. Enabling this made a dell 7500 work. */
w&=~(1<<2); /* MIDI fix off (undoc) */
w&=~(1<<1); /* reserved, always write 0 */
@@ -3170,7 +3193,8 @@
outw(w, iobase+0x18);

w=inw(iobase+0x18);
- w&=~(1<<6); /* Harpo off */
+ w&=~(1<<6); /* HWV irq off */
+ if (hwv) w|=(1<<6);
outw(w, iobase+0x18);

w=inw(iobase+0x18);
@@ -3487,6 +3511,7 @@
/* now go to sleep 'till something interesting happens */
maestro_power(card,ACPI_D2);

+ printk(KERN_INFO "maestro: hardware volume control %senabled\n", (hwv) ? "" : "not ");
printk(KERN_INFO "maestro: %d channels configured.\n", num);
return 1;
}
@@ -3593,6 +3618,10 @@
MODULE_PARM(dsps_order,"i");
MODULE_PARM(use_pm,"i");
MODULE_PARM(clocking, "i");
+
+MODULE_PARM(hwv, "i");
+MODULE_PARM(hwv_input, "i");
+

void cleanup_module(void) {
M_printk("maestro: unloading\n");

-
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