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SubjectAPM Support for AD1848 driver
This patch modifies drivers/sound/ad1848.c to provide APM suspend/resume
support to the AD1848 driver.

To apply this patch,

cd to the top linux source directory

patch --dry-run -p0 < this_file

If the patch program doesn't complain then use the command

patch -p0 < this_file

to really apply the patch. Then issue

make modules; make modules_install

NOTES:
- OSS drivers support (together with the correct driver modules)
must be enabled in the kernel config.

- APM support must be enabled in the kernel config.

- This patch was developed for linux-2.2.19 although it should
apply to linux-2.2.14 through linux-2.2.19

- There's absolutely no warranty of any kind.

Please reply directly to normp@us.ibm.com since I'm not subscribed to the
mailing list.

Thanks,
Norm Proffitt

--- drivers/sound/ad1848.c.org Mon Mar 19 14:28:31 2001
+++ drivers/sound/ad1848.c Wed Mar 21 14:35:20 2001
@@ -26,6 +26,7 @@
* general sleep/wakeup clean up.
* Alan Cox : reformatted. Fixed SMP bugs. Moved to kernel alloc/free
* of irqs. Use dev_id.
+ * Norm Proffitt : backport Aki Laukkanen's power management support
*
* Status:
* Tested. Believed fully functional.
@@ -34,6 +35,9 @@
#include <linux/config.h>
#include <linux/module.h>
#include <linux/stddef.h>
+#ifdef CONFIG_APM
+#include <linux/apm_bios.h>
+#endif

#include "soundmodule.h"

@@ -51,6 +55,7 @@
int irq;
int dma1, dma2;
int dual_dma; /* 1, when two DMA channels allocated */
+ int subtype;
unsigned char MCE_bit;
unsigned char saved_regs[32];
int debug_flag;
@@ -99,6 +104,7 @@
}
ad1848_port_info;

+static struct address_info cfg;
static int nr_ad1848_devs = 0;
int deskpro_xl = 0;
int deskpro_m = 0;
@@ -166,6 +172,7 @@
static void ad1848_halt_input(int dev);
static void ad1848_halt_output(int dev);
static void ad1848_trigger(int dev, int bits);
+static int ad1848_apm_callback(apm_event_t apm_event);

#if defined(CONFIG_SEQUENCER) && !defined(EXCLUDE_TIMERS)
static int ad1848_tmr_install(int dev);
@@ -1866,6 +1873,7 @@
devc->timer_ticks = 0;
devc->dma1 = dma_playback;
devc->dma2 = dma_capture;
+ devc->subtype = cfg.card_subtype;
devc->audio_flags = DMA_AUTOMODE;
devc->playback_dev = devc->record_dev = 0;
if (name != NULL)
@@ -1918,6 +1926,12 @@

nr_ad1848_devs++;

+#ifdef CONFIG_APM
+ if (apm_register_callback(ad1848_apm_callback))
+ {
+ printk(KERN_WARNING "ad1848: APM suspend might not work.\n");
+ }
+#endif
ad1848_init_hw(devc);

if (irq > 0)
@@ -2079,6 +2093,13 @@
if(mixer>=0)
sound_unload_mixerdev(mixer);

+#ifdef CONFIG_APM
+ if (apm_register_callback(ad1848_apm_callback))
+ {
+ printk(KERN_WARNING "ad1848: APM suspend might not work.\n");
+ }
+#endif
+
nr_ad1848_devs--;
for ( ; i < nr_ad1848_devs ; i++)
adev_info[i] = adev_info[i+1];
@@ -2695,6 +2716,104 @@
}
#endif

+#ifdef CONFIG_APM
+static int ad1848_suspend(ad1848_info * devc)
+{
+ unsigned long flags;
+
+ save_flags(flags);
+ cli();
+
+ ad_mute(devc);
+
+ restore_flags(flags);
+ return 0;
+}
+
+static int ad1848_resume(ad1848_info * devc)
+{
+ unsigned long flags;
+ int mixer_levels[32], i;
+
+ save_flags(flags);
+ cli();
+
+ /* store old mixer levels */
+ memcpy(mixer_levels, devc->levels, sizeof(mixer_levels));
+ ad1848_init_hw(devc);
+
+ /* restore mixer levels */
+ for (i = 0; i < 32; i++)
+ ad1848_mixer_set(devc, devc->dev_no, mixer_levels[i]);
+
+ if (devc->subtype)
+ {
+ static signed char interrupt_bits[12] =
+ {
+ -1, -1, -1, -1, -1, 0x00, -1, 0x08, -1, 0x10,
+ 0x18, 0x20
+ };
+ static char dma_bits[4] =
+ {
+ 1, 2, 0, 3
+ };
+
+ signed char bits;
+ char dma2_bit = 0;
+ int config_port = devc->base + 0;
+
+ bits = interrupt_bits[devc->irq];
+ if (bits == -1)
+ {
+ printk(KERN_ERR "MSS: Bad IRQ %d\n", devc->irq);
+ restore_flags(flags);
+ return -1;
+ }
+
+ outb((bits | 0x40), config_port);
+
+ if (devc->dma2 != -1 && devc->dma2 != devc->dma1)
+ if ((devc->dma1 == 0 && devc->dma2 == 1) ||
+ (devc->dma1 == 1 && devc->dma2 == 0) ||
+ (devc->dma1 == 3 && devc->dma2 == 0))
+ dma2_bit = 0x04;
+
+ outb((bits | dma_bits[devc->dma1] | dma2_bit),
+ config_port);
+ }
+
+ restore_flags(flags);
+ return 0;
+}
+
+static int ad1848_apm_callback(apm_event_t apm_event)
+{
+ int n;
+
+ switch (apm_event)
+ {
+ case APM_SYS_SUSPEND:
+ case APM_CRITICAL_SUSPEND:
+ case APM_USER_SUSPEND:
+ for (n = 0; n < nr_ad1848_devs; n++)
+ ad1848_suspend(&adev_info[n]);
+ break;
+
+ case APM_NORMAL_RESUME:
+ case APM_CRITICAL_RESUME:
+ case APM_STANDBY_RESUME:
+ for (n = 0; n < nr_ad1848_devs; n++)
+ ad1848_resume(&adev_info[n]);
+ break;
+
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+#endif

EXPORT_SYMBOL(ad1848_detect);
EXPORT_SYMBOL(ad1848_init);
@@ -2724,8 +2843,6 @@

static int loaded = 0;

-struct address_info hw_config;
-
int init_module(void)
{
printk(KERN_INFO "ad1848/cs4248 codec driver Copyright (C) by Hannu Savolainen 1993-1996\n");
@@ -2736,14 +2853,14 @@
printk(KERN_WARNING "ad1848: must give I/O , IRQ and DMA.\n");
return -EINVAL;
}
- hw_config.irq = irq;
- hw_config.io_base = io;
- hw_config.dma = dma;
- hw_config.dma2 = dma2;
- hw_config.card_subtype = type;
- if(!probe_ms_sound(&hw_config))
+ cfg.irq = irq;
+ cfg.io_base = io;
+ cfg.dma = dma;
+ cfg.dma2 = dma2;
+ cfg.card_subtype = type;
+ if(!probe_ms_sound(&cfg))
return -ENODEV;
- attach_ms_sound(&hw_config);
+ attach_ms_sound(&cfg);
loaded=1;
}
SOUND_LOCK;
@@ -2754,7 +2871,7 @@
{
SOUND_LOCK_END;
if(loaded)
- unload_ms_sound(&hw_config);
+ unload_ms_sound(&cfg);
}

#endif
-
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