[ALSA] AdLib FM card driver

Attached you'll find an ALSA driver for AdLib FM cards. An AdLib card is
just an OPL2, which was already supported by sound/drivers/opl3, so only
very minimal bus-glue is needed. The patch applies cleanly to both
2.6.16 and 2.6.16-mm1.

The driver has been tested with an actual ancient 8-bit ISA AdLib card
and works fine. It also works fine for an OPL3 {,emulation} as still
found on many ISA soundcards but given that AdLib cards don't have their
own mixer, upping the volume from 0 might be a problem without the card
driver already loaded and driving the OPL3.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 161 insertions, 0 deletions

diff --git a/sound/isa/adlib.c b/sound/isa/adlib.c
new file mode 100644
index 000000000000..a253a14e6a45
--- /dev/null
+++ b/sound/isa/adlib.c
@@ -0,0 +1,161 @@
+/*
+ * AdLib FM card driver.
+ */
+
+#include <sound/driver.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/opl3.h>
+
+#define CRD_NAME "AdLib FM"
+#define DRV_NAME "snd_adlib"
+
+MODULE_DESCRIPTION(CRD_NAME);
+MODULE_AUTHOR("Rene Herman");
+MODULE_LICENSE("GPL");
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;
+static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for " CRD_NAME " soundcard.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for " CRD_NAME " soundcard.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable " CRD_NAME " soundcard.");
+module_param_array(port, long, NULL, 0444);
+MODULE_PARM_DESC(port, "Port # for " CRD_NAME " driver.");
+
+static struct platform_device *devices[SNDRV_CARDS];
+
+static void snd_adlib_free(struct snd_card *card)
+{
+        release_and_free_resource(card->private_data);
+}
+
+static int __devinit snd_adlib_probe(struct platform_device *device)
+{
+        struct snd_card *card;
+        struct snd_opl3 *opl3;
+
+        int error;
+        int i = device->id;
+
+        if (port[i] == SNDRV_AUTO_PORT) {
+                snd_printk(KERN_ERR DRV_NAME ": please specify port\n");
+                error = -EINVAL;
+                goto out0;
+        }
+
+        card = snd_card_new(index[i], id[i], THIS_MODULE, 0);
+        if (!card) {
+                snd_printk(KERN_ERR DRV_NAME ": could not create card\n");
+                error = -EINVAL;
+                goto out0;
+        }
+
+        card->private_data = request_region(port[i], 4, CRD_NAME);
+        if (!card->private_data) {
+                snd_printk(KERN_ERR DRV_NAME ": could not grab ports\n");
+                error = -EBUSY;
+                goto out1;
+        }
+        card->private_free = snd_adlib_free;
+
+        error = snd_opl3_create(card, port[i], port[i] + 2, OPL3_HW_AUTO, 1, &opl3);
+        if (error < 0) {
+                snd_printk(KERN_ERR DRV_NAME ": could not create OPL\n");
+                goto out1;
+        }
+
+        error = snd_opl3_hwdep_new(opl3, 0, 0, NULL);
+        if (error < 0) {
+                snd_printk(KERN_ERR DRV_NAME ": could not create FM\n");
+                goto out1;
+        }
+
+        strcpy(card->driver, DRV_NAME);
+        strcpy(card->shortname, CRD_NAME);
+        sprintf(card->longname, CRD_NAME " at %#lx", port[i]);
+
+        snd_card_set_dev(card, &device->dev);
+
+        error = snd_card_register(card);
+        if (error < 0) {
+                snd_printk(KERN_ERR DRV_NAME ": could not register card\n");
+                goto out1;
+        }
+
+        platform_set_drvdata(device, card);
+        return 0;
+
+out1:   snd_card_free(card);
+ out0:  error = -EINVAL; /* FIXME: should be the original error code */
+        return error;
+}
+
+static int __devexit snd_adlib_remove(struct platform_device *device)
+{
+        snd_card_free(platform_get_drvdata(device));
+        platform_set_drvdata(device, NULL);
+        return 0;
+}
+
+static struct platform_driver snd_adlib_driver = {
+        .probe          = snd_adlib_probe,
+        .remove         = __devexit_p(snd_adlib_remove),
+
+        .driver         = {
+                .name   = DRV_NAME
+        }
+};
+
+static int __init alsa_card_adlib_init(void)
+{
+        int i, cards;
+
+        if (platform_driver_register(&snd_adlib_driver) < 0) {
+                snd_printk(KERN_ERR DRV_NAME ": could not register driver\n");
+                return -ENODEV;
+        }
+
+        for (cards = 0, i = 0; i < SNDRV_CARDS; i++) {
+                struct platform_device *device;
+
+                if (!enable[i])
+                        continue;
+
+                device = platform_device_register_simple(DRV_NAME, i, NULL, 0);
+                if (IS_ERR(device))
+                        continue;
+
+                devices[i] = device;
+                cards++;
+        }
+
+        if (!cards) {
+#ifdef MODULE
+                printk(KERN_ERR CRD_NAME " soundcard not found or device busy\n");
+#endif
+                platform_driver_unregister(&snd_adlib_driver);
+                return -ENODEV;
+        }
+        return 0;
+}
+
+static void __exit alsa_card_adlib_exit(void)
+{
+        int i;
+
+        for (i = 0; i < SNDRV_CARDS; i++)
+                platform_device_unregister(devices[i]);
+        platform_driver_unregister(&snd_adlib_driver);
+}
+
+module_init(alsa_card_adlib_init);
+module_exit(alsa_card_adlib_exit);