/*
   *  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
  ");
  
  	*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
  ", 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
  ");
  		return -EINVAL;
  	}
  	if (irq[dev] == SNDRV_AUTO_IRQ) {
  		snd_printk(KERN_ERR "specify or disable IRQ
  ");
  		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
  ");
  		return -ENODEV;
  	}
  	if (pnp_port_len(device, 0) < IO_EXTENT) {
  		snd_printk(KERN_ERR "PnP port length is %llu, expected %d
  ",
  			   (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
  ");
  		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
  ");
  #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)