[PATCH] Add retain_initrd boot option
[linux-2.6.git] / sound / drivers / mpu401 / mpu401.c
1 /*
2  *  Driver for generic MPU-401 boards (UART mode only)
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
24 #include <linux/init.h>
25 #include <linux/pnp.h>
26 #include <linux/err.h>
27 #include <linux/platform_device.h>
28 #include <linux/moduleparam.h>
29 #include <sound/core.h>
30 #include <sound/mpu401.h>
31 #include <sound/initval.h>
32
33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
34 MODULE_DESCRIPTION("MPU-401 UART");
35 MODULE_LICENSE("GPL");
36
37 static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
38 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
39 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;  /* Enable this card */
40 #ifdef CONFIG_PNP
41 static int pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
42 #endif
43 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;     /* MPU-401 port number */
44 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;        /* MPU-401 IRQ */
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
61 static struct platform_device *platform_devices[SNDRV_CARDS];
62 static int pnp_registered;
63 static unsigned int snd_mpu401_devices;
64
65 static int snd_mpu401_create(int dev, struct snd_card **rcard)
66 {
67         struct snd_card *card;
68         int err;
69
70         *rcard = NULL;
71         card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
72         if (card == NULL)
73                 return -ENOMEM;
74         strcpy(card->driver, "MPU-401 UART");
75         strcpy(card->shortname, card->driver);
76         sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
77         if (irq[dev] >= 0) {
78                 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
79         } else {
80                 strcat(card->longname, "polled");
81         }
82
83         if ((err = snd_mpu401_uart_new(card, 0,
84                                        MPU401_HW_MPU401,
85                                        port[dev], 0,
86                                        irq[dev], irq[dev] >= 0 ? IRQF_DISABLED : 0, NULL)) < 0) {
87                 printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
88                 goto _err;
89         }
90
91         *rcard = card;
92         return 0;
93
94  _err:
95         snd_card_free(card);
96         return err;
97 }
98
99 static int __devinit snd_mpu401_probe(struct platform_device *devptr)
100 {
101         int dev = devptr->id;
102         int err;
103         struct snd_card *card;
104
105         if (port[dev] == SNDRV_AUTO_PORT) {
106                 snd_printk(KERN_ERR "specify port\n");
107                 return -EINVAL;
108         }
109         if (irq[dev] == SNDRV_AUTO_IRQ) {
110                 snd_printk(KERN_ERR "specify or disable IRQ\n");
111                 return -EINVAL;
112         }
113         err = snd_mpu401_create(dev, &card);
114         if (err < 0)
115                 return err;
116         snd_card_set_dev(card, &devptr->dev);
117         if ((err = snd_card_register(card)) < 0) {
118                 snd_card_free(card);
119                 return err;
120         }
121         platform_set_drvdata(devptr, card);
122         return 0;
123 }
124
125 static int __devexit snd_mpu401_remove(struct platform_device *devptr)
126 {
127         snd_card_free(platform_get_drvdata(devptr));
128         platform_set_drvdata(devptr, NULL);
129         return 0;
130 }
131
132 #define SND_MPU401_DRIVER       "snd_mpu401"
133
134 static struct platform_driver snd_mpu401_driver = {
135         .probe          = snd_mpu401_probe,
136         .remove         = __devexit_p(snd_mpu401_remove),
137         .driver         = {
138                 .name   = SND_MPU401_DRIVER
139         },
140 };
141
142
143 #ifdef CONFIG_PNP
144
145 #define IO_EXTENT 2
146
147 static struct pnp_device_id snd_mpu401_pnpids[] = {
148         { .id = "PNPb006" },
149         { .id = "" }
150 };
151
152 MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
153
154 static int __devinit snd_mpu401_pnp(int dev, struct pnp_dev *device,
155                                  const struct pnp_device_id *id)
156 {
157         if (!pnp_port_valid(device, 0) ||
158             pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
159                 snd_printk(KERN_ERR "no PnP port\n");
160                 return -ENODEV;
161         }
162         if (pnp_port_len(device, 0) < IO_EXTENT) {
163                 snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
164                            (unsigned long long)pnp_port_len(device, 0),
165                            IO_EXTENT);
166                 return -ENODEV;
167         }
168         port[dev] = pnp_port_start(device, 0);
169
170         if (!pnp_irq_valid(device, 0) ||
171             pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
172                 snd_printk(KERN_WARNING "no PnP irq, using polling\n");
173                 irq[dev] = -1;
174         } else {
175                 irq[dev] = pnp_irq(device, 0);
176         }
177         return 0;
178 }
179
180 static int __devinit snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
181                                           const struct pnp_device_id *id)
182 {
183         static int dev;
184         struct snd_card *card;
185         int err;
186
187         for ( ; dev < SNDRV_CARDS; ++dev) {
188                 if (!enable[dev] || !pnp[dev])
189                         continue;
190                 err = snd_mpu401_pnp(dev, pnp_dev, id);
191                 if (err < 0)
192                         return err;
193                 err = snd_mpu401_create(dev, &card);
194                 if (err < 0)
195                         return err;
196                 if ((err = snd_card_register(card)) < 0) {
197                         snd_card_free(card);
198                         return err;
199                 }
200                 snd_card_set_dev(card, &pnp_dev->dev);
201                 pnp_set_drvdata(pnp_dev, card);
202                 snd_mpu401_devices++;
203                 ++dev;
204                 return 0;
205         }
206         return -ENODEV;
207 }
208
209 static void __devexit snd_mpu401_pnp_remove(struct pnp_dev *dev)
210 {
211         struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
212
213         snd_card_disconnect(card);
214         snd_card_free_when_closed(card);
215 }
216
217 static struct pnp_driver snd_mpu401_pnp_driver = {
218         .name = "mpu401",
219         .id_table = snd_mpu401_pnpids,
220         .probe = snd_mpu401_pnp_probe,
221         .remove = __devexit_p(snd_mpu401_pnp_remove),
222 };
223 #else
224 static struct pnp_driver snd_mpu401_pnp_driver;
225 #endif
226
227 static void __init_or_module snd_mpu401_unregister_all(void)
228 {
229         int i;
230
231         if (pnp_registered)
232                 pnp_unregister_driver(&snd_mpu401_pnp_driver);
233         for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
234                 platform_device_unregister(platform_devices[i]);
235         platform_driver_unregister(&snd_mpu401_driver);
236 }
237
238 static int __init alsa_card_mpu401_init(void)
239 {
240         int i, err;
241
242         if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
243                 return err;
244
245         for (i = 0; i < SNDRV_CARDS; i++) {
246                 struct platform_device *device;
247                 if (! enable[i])
248                         continue;
249 #ifdef CONFIG_PNP
250                 if (pnp[i])
251                         continue;
252 #endif
253                 device = platform_device_register_simple(SND_MPU401_DRIVER,
254                                                          i, NULL, 0);
255                 if (IS_ERR(device))
256                         continue;
257                 if (!platform_get_drvdata(device)) {
258                         platform_device_unregister(device);
259                         continue;
260                 }
261                 platform_devices[i] = device;
262                 snd_mpu401_devices++;
263         }
264         err = pnp_register_driver(&snd_mpu401_pnp_driver);
265         if (!err)
266                 pnp_registered = 1;
267
268         if (!snd_mpu401_devices) {
269 #ifdef MODULE
270                 printk(KERN_ERR "MPU-401 device not found or device busy\n");
271 #endif
272                 snd_mpu401_unregister_all();
273                 return -ENODEV;
274         }
275         return 0;
276 }
277
278 static void __exit alsa_card_mpu401_exit(void)
279 {
280         snd_mpu401_unregister_all();
281 }
282
283 module_init(alsa_card_mpu401_init)
284 module_exit(alsa_card_mpu401_exit)