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linux-sg2042/sound/drivers/mpu401/mpu401.c

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/*
* Driver for generic MPU-401 boards (UART mode only)
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
* Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/pnp.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/mpu401.h>
#include <sound/initval.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("MPU-401 UART");
MODULE_LICENSE("GPL");
static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
#ifdef CONFIG_PNP
static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
#endif
static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */
static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */
static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
#ifdef CONFIG_PNP
module_param_array(pnp, bool, NULL, 0444);
MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
#endif
module_param_array(port, long, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
module_param_array(irq, int, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
module_param_array(uart_enter, bool, NULL, 0444);
MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
static struct platform_device *platform_devices[SNDRV_CARDS];
static int pnp_registered;
static unsigned int snd_mpu401_devices;
static int snd_mpu401_create(int dev, struct snd_card **rcard)
{
struct snd_card *card;
int err;
if (!uart_enter[dev])
snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n");
*rcard = NULL;
err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
if (err < 0)
return err;
strcpy(card->driver, "MPU-401 UART");
strcpy(card->shortname, card->driver);
sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
if (irq[dev] >= 0) {
sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
} else {
strcat(card->longname, "polled");
}
err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,
irq[dev], NULL);
if (err < 0) {
printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
goto _err;
}
*rcard = card;
return 0;
_err:
snd_card_free(card);
return err;
}
static int snd_mpu401_probe(struct platform_device *devptr)
{
int dev = devptr->id;
int err;
struct snd_card *card;
if (port[dev] == SNDRV_AUTO_PORT) {
snd_printk(KERN_ERR "specify port\n");
return -EINVAL;
}
if (irq[dev] == SNDRV_AUTO_IRQ) {
snd_printk(KERN_ERR "specify or disable IRQ\n");
return -EINVAL;
}
err = snd_mpu401_create(dev, &card);
if (err < 0)
return err;
snd_card_set_dev(card, &devptr->dev);
if ((err = snd_card_register(card)) < 0) {
snd_card_free(card);
return err;
}
platform_set_drvdata(devptr, card);
return 0;
}
static int snd_mpu401_remove(struct platform_device *devptr)
{
snd_card_free(platform_get_drvdata(devptr));
return 0;
}
#define SND_MPU401_DRIVER "snd_mpu401"
static struct platform_driver snd_mpu401_driver = {
.probe = snd_mpu401_probe,
.remove = snd_mpu401_remove,
.driver = {
.name = SND_MPU401_DRIVER,
.owner = THIS_MODULE,
},
};
#ifdef CONFIG_PNP
#define IO_EXTENT 2
static struct pnp_device_id snd_mpu401_pnpids[] = {
{ .id = "PNPb006" },
{ .id = "" }
};
MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
static int snd_mpu401_pnp(int dev, struct pnp_dev *device,
const struct pnp_device_id *id)
{
if (!pnp_port_valid(device, 0) ||
pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
snd_printk(KERN_ERR "no PnP port\n");
return -ENODEV;
}
if (pnp_port_len(device, 0) < IO_EXTENT) {
snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
(unsigned long long)pnp_port_len(device, 0),
IO_EXTENT);
return -ENODEV;
}
port[dev] = pnp_port_start(device, 0);
if (!pnp_irq_valid(device, 0) ||
pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
snd_printk(KERN_WARNING "no PnP irq, using polling\n");
irq[dev] = -1;
} else {
irq[dev] = pnp_irq(device, 0);
}
return 0;
}
static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
const struct pnp_device_id *id)
{
static int dev;
struct snd_card *card;
int err;
for ( ; dev < SNDRV_CARDS; ++dev) {
if (!enable[dev] || !pnp[dev])
continue;
err = snd_mpu401_pnp(dev, pnp_dev, id);
if (err < 0)
return err;
err = snd_mpu401_create(dev, &card);
if (err < 0)
return err;
if ((err = snd_card_register(card)) < 0) {
snd_card_free(card);
return err;
}
snd_card_set_dev(card, &pnp_dev->dev);
pnp_set_drvdata(pnp_dev, card);
snd_mpu401_devices++;
++dev;
return 0;
}
return -ENODEV;
}
static void snd_mpu401_pnp_remove(struct pnp_dev *dev)
{
struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
snd_card_disconnect(card);
snd_card_free_when_closed(card);
}
static struct pnp_driver snd_mpu401_pnp_driver = {
.name = "mpu401",
.id_table = snd_mpu401_pnpids,
.probe = snd_mpu401_pnp_probe,
.remove = snd_mpu401_pnp_remove,
};
#else
static struct pnp_driver snd_mpu401_pnp_driver;
#endif
static void snd_mpu401_unregister_all(void)
{
int i;
if (pnp_registered)
pnp_unregister_driver(&snd_mpu401_pnp_driver);
for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
platform_device_unregister(platform_devices[i]);
platform_driver_unregister(&snd_mpu401_driver);
}
static int __init alsa_card_mpu401_init(void)
{
int i, err;
if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
return err;
for (i = 0; i < SNDRV_CARDS; i++) {
struct platform_device *device;
if (! enable[i])
continue;
#ifdef CONFIG_PNP
if (pnp[i])
continue;
#endif
device = platform_device_register_simple(SND_MPU401_DRIVER,
i, NULL, 0);
if (IS_ERR(device))
continue;
if (!platform_get_drvdata(device)) {
platform_device_unregister(device);
continue;
}
platform_devices[i] = device;
snd_mpu401_devices++;
}
err = pnp_register_driver(&snd_mpu401_pnp_driver);
if (!err)
pnp_registered = 1;
if (!snd_mpu401_devices) {
#ifdef MODULE
printk(KERN_ERR "MPU-401 device not found or device busy\n");
#endif
snd_mpu401_unregister_all();
return -ENODEV;
}
return 0;
}
static void __exit alsa_card_mpu401_exit(void)
{
snd_mpu401_unregister_all();
}
module_init(alsa_card_mpu401_init)
module_exit(alsa_card_mpu401_exit)
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