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Linux/sound/drivers/mpu401/mpu401.c

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  1 /*
  2  *  Driver for generic MPU-401 boards (UART mode only)
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *  Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr>
  5  *
  6  *
  7  *   This program is free software; you can redistribute it and/or modify
  8  *   it under the terms of the GNU General Public License as published by
  9  *   the Free Software Foundation; either version 2 of the License, or
 10  *   (at your option) any later version.
 11  *
 12  *   This program is distributed in the hope that it will be useful,
 13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *   GNU General Public License for more details.
 16  *
 17  *   You should have received a copy of the GNU General Public License
 18  *   along with this program; if not, write to the Free Software
 19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 20  *
 21  */
 22 
 23 #include <linux/init.h>
 24 #include <linux/pnp.h>
 25 #include <linux/err.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/module.h>
 28 #include <sound/core.h>
 29 #include <sound/mpu401.h>
 30 #include <sound/initval.h>
 31 
 32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 33 MODULE_DESCRIPTION("MPU-401 UART");
 34 MODULE_LICENSE("GPL");
 35 
 36 static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
 37 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 38 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
 39 #ifdef CONFIG_PNP
 40 static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 41 #endif
 42 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;     /* MPU-401 port number */
 43 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;        /* MPU-401 IRQ */
 44 static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 45 
 46 module_param_array(index, int, NULL, 0444);
 47 MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
 48 module_param_array(id, charp, NULL, 0444);
 49 MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
 50 module_param_array(enable, bool, NULL, 0444);
 51 MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
 52 #ifdef CONFIG_PNP
 53 module_param_array(pnp, bool, NULL, 0444);
 54 MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
 55 #endif
 56 module_param_array(port, long, NULL, 0444);
 57 MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
 58 module_param_array(irq, int, NULL, 0444);
 59 MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
 60 module_param_array(uart_enter, bool, NULL, 0444);
 61 MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
 62 
 63 static struct platform_device *platform_devices[SNDRV_CARDS];
 64 static int pnp_registered;
 65 static unsigned int snd_mpu401_devices;
 66 
 67 static int snd_mpu401_create(int dev, struct snd_card **rcard)
 68 {
 69         struct snd_card *card;
 70         int err;
 71 
 72         if (!uart_enter[dev])
 73                 snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n");
 74 
 75         *rcard = NULL;
 76         err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
 77         if (err < 0)
 78                 return err;
 79         strcpy(card->driver, "MPU-401 UART");
 80         strcpy(card->shortname, card->driver);
 81         sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
 82         if (irq[dev] >= 0) {
 83                 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
 84         } else {
 85                 strcat(card->longname, "polled");
 86         }
 87 
 88         err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,
 89                                   irq[dev], NULL);
 90         if (err < 0) {
 91                 printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
 92                 goto _err;
 93         }
 94 
 95         *rcard = card;
 96         return 0;
 97 
 98  _err:
 99         snd_card_free(card);
100         return err;
101 }
102 
103 static int snd_mpu401_probe(struct platform_device *devptr)
104 {
105         int dev = devptr->id;
106         int err;
107         struct snd_card *card;
108 
109         if (port[dev] == SNDRV_AUTO_PORT) {
110                 snd_printk(KERN_ERR "specify port\n");
111                 return -EINVAL;
112         }
113         if (irq[dev] == SNDRV_AUTO_IRQ) {
114                 snd_printk(KERN_ERR "specify or disable IRQ\n");
115                 return -EINVAL;
116         }
117         err = snd_mpu401_create(dev, &card);
118         if (err < 0)
119                 return err;
120         snd_card_set_dev(card, &devptr->dev);
121         if ((err = snd_card_register(card)) < 0) {
122                 snd_card_free(card);
123                 return err;
124         }
125         platform_set_drvdata(devptr, card);
126         return 0;
127 }
128 
129 static int snd_mpu401_remove(struct platform_device *devptr)
130 {
131         snd_card_free(platform_get_drvdata(devptr));
132         platform_set_drvdata(devptr, NULL);
133         return 0;
134 }
135 
136 #define SND_MPU401_DRIVER       "snd_mpu401"
137 
138 static struct platform_driver snd_mpu401_driver = {
139         .probe          = snd_mpu401_probe,
140         .remove         = snd_mpu401_remove,
141         .driver         = {
142                 .name   = SND_MPU401_DRIVER,
143                 .owner  = THIS_MODULE,
144         },
145 };
146 
147 
148 #ifdef CONFIG_PNP
149 
150 #define IO_EXTENT 2
151 
152 static struct pnp_device_id snd_mpu401_pnpids[] = {
153         { .id = "PNPb006" },
154         { .id = "" }
155 };
156 
157 MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
158 
159 static int snd_mpu401_pnp(int dev, struct pnp_dev *device,
160                           const struct pnp_device_id *id)
161 {
162         if (!pnp_port_valid(device, 0) ||
163             pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
164                 snd_printk(KERN_ERR "no PnP port\n");
165                 return -ENODEV;
166         }
167         if (pnp_port_len(device, 0) < IO_EXTENT) {
168                 snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
169                            (unsigned long long)pnp_port_len(device, 0),
170                            IO_EXTENT);
171                 return -ENODEV;
172         }
173         port[dev] = pnp_port_start(device, 0);
174 
175         if (!pnp_irq_valid(device, 0) ||
176             pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
177                 snd_printk(KERN_WARNING "no PnP irq, using polling\n");
178                 irq[dev] = -1;
179         } else {
180                 irq[dev] = pnp_irq(device, 0);
181         }
182         return 0;
183 }
184 
185 static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
186                                 const struct pnp_device_id *id)
187 {
188         static int dev;
189         struct snd_card *card;
190         int err;
191 
192         for ( ; dev < SNDRV_CARDS; ++dev) {
193                 if (!enable[dev] || !pnp[dev])
194                         continue;
195                 err = snd_mpu401_pnp(dev, pnp_dev, id);
196                 if (err < 0)
197                         return err;
198                 err = snd_mpu401_create(dev, &card);
199                 if (err < 0)
200                         return err;
201                 if ((err = snd_card_register(card)) < 0) {
202                         snd_card_free(card);
203                         return err;
204                 }
205                 snd_card_set_dev(card, &pnp_dev->dev);
206                 pnp_set_drvdata(pnp_dev, card);
207                 snd_mpu401_devices++;
208                 ++dev;
209                 return 0;
210         }
211         return -ENODEV;
212 }
213 
214 static void snd_mpu401_pnp_remove(struct pnp_dev *dev)
215 {
216         struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
217 
218         snd_card_disconnect(card);
219         snd_card_free_when_closed(card);
220 }
221 
222 static struct pnp_driver snd_mpu401_pnp_driver = {
223         .name = "mpu401",
224         .id_table = snd_mpu401_pnpids,
225         .probe = snd_mpu401_pnp_probe,
226         .remove = snd_mpu401_pnp_remove,
227 };
228 #else
229 static struct pnp_driver snd_mpu401_pnp_driver;
230 #endif
231 
232 static void snd_mpu401_unregister_all(void)
233 {
234         int i;
235 
236         if (pnp_registered)
237                 pnp_unregister_driver(&snd_mpu401_pnp_driver);
238         for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
239                 platform_device_unregister(platform_devices[i]);
240         platform_driver_unregister(&snd_mpu401_driver);
241 }
242 
243 static int __init alsa_card_mpu401_init(void)
244 {
245         int i, err;
246 
247         if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
248                 return err;
249 
250         for (i = 0; i < SNDRV_CARDS; i++) {
251                 struct platform_device *device;
252                 if (! enable[i])
253                         continue;
254 #ifdef CONFIG_PNP
255                 if (pnp[i])
256                         continue;
257 #endif
258                 device = platform_device_register_simple(SND_MPU401_DRIVER,
259                                                          i, NULL, 0);
260                 if (IS_ERR(device))
261                         continue;
262                 if (!platform_get_drvdata(device)) {
263                         platform_device_unregister(device);
264                         continue;
265                 }
266                 platform_devices[i] = device;
267                 snd_mpu401_devices++;
268         }
269         err = pnp_register_driver(&snd_mpu401_pnp_driver);
270         if (!err)
271                 pnp_registered = 1;
272 
273         if (!snd_mpu401_devices) {
274 #ifdef MODULE
275                 printk(KERN_ERR "MPU-401 device not found or device busy\n");
276 #endif
277                 snd_mpu401_unregister_all();
278                 return -ENODEV;
279         }
280         return 0;
281 }
282 
283 static void __exit alsa_card_mpu401_exit(void)
284 {
285         snd_mpu401_unregister_all();
286 }
287 
288 module_init(alsa_card_mpu401_init)
289 module_exit(alsa_card_mpu401_exit)
290 

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