mpu401.c revision f301ae6a690abe7edd2f92fa6df0b1b06986a6ad 
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
33MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
34MODULE_DESCRIPTION("MPU-401 UART");
35MODULE_LICENSE("GPL");
36
37static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
38static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
39static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;	/* Enable this card */
40#ifdef CONFIG_PNP
41static int pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
42#endif
43static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;	/* MPU-401 port number */
44static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;	/* MPU-401 IRQ */
45
46module_param_array(index, int, NULL, 0444);
47MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
48module_param_array(id, charp, NULL, 0444);
49MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
50module_param_array(enable, bool, NULL, 0444);
51MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
52#ifdef CONFIG_PNP
53module_param_array(pnp, bool, NULL, 0444);
54MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
55#endif
56module_param_array(port, long, NULL, 0444);
57MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
58module_param_array(irq, int, NULL, 0444);
59MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
60
61static struct platform_device *platform_devices[SNDRV_CARDS];
62static int pnp_registered;
63static unsigned int snd_mpu401_devices;
64
65static 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 ? SA_INTERRUPT : 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
99static 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
125static 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
134static 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
147static struct pnp_device_id snd_mpu401_pnpids[] = {
148	{ .id = "PNPb006" },
149	{ .id = "" }
150};
151
152MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
153
154static int __init 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 %ld, expected %d\n",
164			   pnp_port_len(device, 0), IO_EXTENT);
165		return -ENODEV;
166	}
167	port[dev] = pnp_port_start(device, 0);
168
169	if (!pnp_irq_valid(device, 0) ||
170	    pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
171		snd_printk(KERN_WARNING "no PnP irq, using polling\n");
172		irq[dev] = -1;
173	} else {
174		irq[dev] = pnp_irq(device, 0);
175	}
176	return 0;
177}
178
179static int __devinit snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
180					  const struct pnp_device_id *id)
181{
182	static int dev;
183	struct snd_card *card;
184	int err;
185
186	for ( ; dev < SNDRV_CARDS; ++dev) {
187		if (!enable[dev] || !pnp[dev])
188			continue;
189		err = snd_mpu401_pnp(dev, pnp_dev, id);
190		if (err < 0)
191			return err;
192		err = snd_mpu401_create(dev, &card);
193		if (err < 0)
194			return err;
195		if ((err = snd_card_register(card)) < 0) {
196			snd_card_free(card);
197			return err;
198		}
199		snd_card_set_dev(card, &pnp_dev->dev);
200		pnp_set_drvdata(pnp_dev, card);
201		snd_mpu401_devices++;
202		++dev;
203		return 0;
204	}
205	return -ENODEV;
206}
207
208static void __devexit snd_mpu401_pnp_remove(struct pnp_dev *dev)
209{
210	struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
211
212	snd_card_disconnect(card);
213	snd_card_free_in_thread(card);
214}
215
216static struct pnp_driver snd_mpu401_pnp_driver = {
217	.name = "mpu401",
218	.id_table = snd_mpu401_pnpids,
219	.probe = snd_mpu401_pnp_probe,
220	.remove = __devexit_p(snd_mpu401_pnp_remove),
221};
222#else
223static struct pnp_driver snd_mpu401_pnp_driver;
224#endif
225
226static void __init_or_module snd_mpu401_unregister_all(void)
227{
228	int i;
229
230	if (pnp_registered)
231		pnp_unregister_driver(&snd_mpu401_pnp_driver);
232	for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
233		platform_device_unregister(platform_devices[i]);
234	platform_driver_unregister(&snd_mpu401_driver);
235}
236
237static int __init alsa_card_mpu401_init(void)
238{
239	int i, err;
240
241	if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
242		return err;
243
244	for (i = 0; i < SNDRV_CARDS; i++) {
245		struct platform_device *device;
246		if (! enable[i])
247			continue;
248#ifdef CONFIG_PNP
249		if (pnp[i])
250			continue;
251#endif
252		device = platform_device_register_simple(SND_MPU401_DRIVER,
253							 i, NULL, 0);
254		if (IS_ERR(device)) {
255			err = PTR_ERR(device);
256			goto errout;
257		}
258		platform_devices[i] = device;
259		snd_mpu401_devices++;
260	}
261	err = pnp_register_driver(&snd_mpu401_pnp_driver);
262	if (!err)
263		pnp_registered = 1;
264
265	if (!snd_mpu401_devices) {
266#ifdef MODULE
267		printk(KERN_ERR "MPU-401 device not found or device busy\n");
268#endif
269		err = -ENODEV;
270		goto errout;
271	}
272	return 0;
273
274 errout:
275	snd_mpu401_unregister_all();
276	return err;
277}
278
279static void __exit alsa_card_mpu401_exit(void)
280{
281	snd_mpu401_unregister_all();
282}
283
284module_init(alsa_card_mpu401_init)
285module_exit(alsa_card_mpu401_exit)
286