forked from Minki/linux
cf40a310a7
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>
162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
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* AdLib FM card driver.
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*/
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#include <sound/driver.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/opl3.h>
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#define CRD_NAME "AdLib FM"
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#define DRV_NAME "snd_adlib"
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MODULE_DESCRIPTION(CRD_NAME);
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MODULE_AUTHOR("Rene Herman");
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MODULE_LICENSE("GPL");
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
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static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;
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static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for " CRD_NAME " soundcard.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for " CRD_NAME " soundcard.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable " CRD_NAME " soundcard.");
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module_param_array(port, long, NULL, 0444);
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MODULE_PARM_DESC(port, "Port # for " CRD_NAME " driver.");
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static struct platform_device *devices[SNDRV_CARDS];
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static void snd_adlib_free(struct snd_card *card)
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{
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release_and_free_resource(card->private_data);
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}
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static int __devinit snd_adlib_probe(struct platform_device *device)
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{
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struct snd_card *card;
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struct snd_opl3 *opl3;
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int error;
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int i = device->id;
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if (port[i] == SNDRV_AUTO_PORT) {
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snd_printk(KERN_ERR DRV_NAME ": please specify port\n");
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error = -EINVAL;
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goto out0;
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}
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card = snd_card_new(index[i], id[i], THIS_MODULE, 0);
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if (!card) {
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snd_printk(KERN_ERR DRV_NAME ": could not create card\n");
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error = -EINVAL;
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goto out0;
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}
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card->private_data = request_region(port[i], 4, CRD_NAME);
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if (!card->private_data) {
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snd_printk(KERN_ERR DRV_NAME ": could not grab ports\n");
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error = -EBUSY;
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goto out1;
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}
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card->private_free = snd_adlib_free;
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error = snd_opl3_create(card, port[i], port[i] + 2, OPL3_HW_AUTO, 1, &opl3);
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if (error < 0) {
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snd_printk(KERN_ERR DRV_NAME ": could not create OPL\n");
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goto out1;
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}
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error = snd_opl3_hwdep_new(opl3, 0, 0, NULL);
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if (error < 0) {
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snd_printk(KERN_ERR DRV_NAME ": could not create FM\n");
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goto out1;
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}
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strcpy(card->driver, DRV_NAME);
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strcpy(card->shortname, CRD_NAME);
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sprintf(card->longname, CRD_NAME " at %#lx", port[i]);
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snd_card_set_dev(card, &device->dev);
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error = snd_card_register(card);
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if (error < 0) {
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snd_printk(KERN_ERR DRV_NAME ": could not register card\n");
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goto out1;
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}
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platform_set_drvdata(device, card);
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return 0;
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out1: snd_card_free(card);
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out0: error = -EINVAL; /* FIXME: should be the original error code */
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return error;
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}
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static int __devexit snd_adlib_remove(struct platform_device *device)
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{
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snd_card_free(platform_get_drvdata(device));
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platform_set_drvdata(device, NULL);
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return 0;
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}
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static struct platform_driver snd_adlib_driver = {
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.probe = snd_adlib_probe,
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.remove = __devexit_p(snd_adlib_remove),
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.driver = {
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.name = DRV_NAME
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}
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};
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static int __init alsa_card_adlib_init(void)
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{
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int i, cards;
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if (platform_driver_register(&snd_adlib_driver) < 0) {
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snd_printk(KERN_ERR DRV_NAME ": could not register driver\n");
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return -ENODEV;
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}
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for (cards = 0, i = 0; i < SNDRV_CARDS; i++) {
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struct platform_device *device;
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if (!enable[i])
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continue;
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device = platform_device_register_simple(DRV_NAME, i, NULL, 0);
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if (IS_ERR(device))
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continue;
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devices[i] = device;
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cards++;
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}
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if (!cards) {
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#ifdef MODULE
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printk(KERN_ERR CRD_NAME " soundcard not found or device busy\n");
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#endif
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platform_driver_unregister(&snd_adlib_driver);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit alsa_card_adlib_exit(void)
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{
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int i;
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for (i = 0; i < SNDRV_CARDS; i++)
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platform_device_unregister(devices[i]);
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platform_driver_unregister(&snd_adlib_driver);
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}
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module_init(alsa_card_adlib_init);
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module_exit(alsa_card_adlib_exit);
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