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SubjectRe: [patch] ess maestro, support for hardware volume control
> below is the version with the suggested fixes, and with s/hwv/hwvol/ for
> hwv_input also.

fantastic, thanks lukas.

alan, can you throw this in -ac? I don't think it will cause problems
for people with nonstandard wiring on the hw vol pins (read: dell
lattitudes), but if it does we can blacklist the lattitudes (later turning
into enabling support code for their custom hw vol wiring.. its on the
todo list :/). This should work on inspirons.

- z

> --- linux-2.4.6-pre2/drivers/sound/maestro.c Sat Jun 9 16:55:22 2001
> +++ linux/drivers/sound/maestro.c Sat Jun 9 19:48:34 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 hwvol_enable= to allow disabling of HWV (values are 0 or 1)
> + * add hwvol_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 hwvol_enable = 1;
> +/* hardware volume input pin selection */
> +static int hwvol_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 +1911,20 @@
>
> 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);
> + spin_lock(&s->lock);
> + set_mixer(c, 0, val);
> + spin_unlock(&s->lock);
> }
> else
> {
> @@ -3088,8 +3111,10 @@
> w&=~(1<<14); /* External clock */
>
> w&=~(1<<7); /* HWV off */
> + if (hwvol_enable) w|=(1<<7);
> w&=~(1<<6); /* Debounce off */
> - w&=~(1<<5); /* GPIO 4:5 */
> + w&=~(1<<5); /* GPIO 4:5 ; HVI pin selection */
> + if (hwvol_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 +3195,8 @@
> outw(w, iobase+0x18);
>
> w=inw(iobase+0x18);
> - w&=~(1<<6); /* Harpo off */
> + w&=~(1<<6); /* HWV irq off */
> + if (hwvol_enable) w|=(1<<6);
> outw(w, iobase+0x18);
>
> w=inw(iobase+0x18);
> @@ -3487,6 +3513,7 @@
> /* now go to sleep 'till something interesting happens */
> maestro_power(card,ACPI_D2);
>
> + printk(KERN_INFO "maestro: hardware volume control %senabled\n", (hwvol_enable) ? "" : "not ");
> printk(KERN_INFO "maestro: %d channels configured.\n", num);
> return 1;
> }
> @@ -3593,6 +3620,10 @@
> MODULE_PARM(dsps_order,"i");
> MODULE_PARM(use_pm,"i");
> MODULE_PARM(clocking, "i");
> +
> +MODULE_PARM(hwvol_enable, "i");
> +MODULE_PARM(hwvol_input, "i");
> +
>
> void cleanup_module(void) {
> M_printk("maestro: unloading\n");
>
-
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