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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Driver for generic MPU-401 boards (UART mode only)
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 * Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr>
6 */
7
8#include <linux/init.h>
9#include <linux/pnp.h>
10#include <linux/err.h>
11#include <linux/platform_device.h>
12#include <linux/module.h>
13#include <sound/core.h>
14#include <sound/mpu401.h>
15#include <sound/initval.h>
16
17MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
18MODULE_DESCRIPTION("MPU-401 UART");
19MODULE_LICENSE("GPL");
20
21static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
22static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
23static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
24#ifdef CONFIG_PNP
25static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
26#endif
27static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */
28static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */
29static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
30
31module_param_array(index, int, NULL, 0444);
32MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
33module_param_array(id, charp, NULL, 0444);
34MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
35module_param_array(enable, bool, NULL, 0444);
36MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
37#ifdef CONFIG_PNP
38module_param_array(pnp, bool, NULL, 0444);
39MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
40#endif
41module_param_hw_array(port, long, ioport, NULL, 0444);
42MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
43module_param_hw_array(irq, int, irq, NULL, 0444);
44MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
45module_param_array(uart_enter, bool, NULL, 0444);
46MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
47
48static struct platform_device *platform_devices[SNDRV_CARDS];
49static int pnp_registered;
50static unsigned int snd_mpu401_devices;
51
52static int snd_mpu401_create(struct device *devptr, int dev,
53 struct snd_card **rcard)
54{
55 struct snd_card *card;
56 int err;
57
58 if (!uart_enter[dev])
59 dev_err(devptr, "the uart_enter option is obsolete; remove it\n");
60
61 *rcard = NULL;
62 err = snd_devm_card_new(devptr, index[dev], id[dev], THIS_MODULE,
63 0, &card);
64 if (err < 0)
65 return err;
66 strcpy(card->driver, "MPU-401 UART");
67 strcpy(card->shortname, card->driver);
68 sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
69 if (irq[dev] >= 0) {
70 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
71 } else {
72 strcat(card->longname, "polled");
73 }
74
75 err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,
76 irq[dev], NULL);
77 if (err < 0) {
78 dev_err(devptr, "MPU401 not detected at 0x%lx\n", port[dev]);
79 return err;
80 }
81
82 *rcard = card;
83 return 0;
84}
85
86static int snd_mpu401_probe(struct platform_device *devptr)
87{
88 int dev = devptr->id;
89 int err;
90 struct snd_card *card;
91
92 if (port[dev] == SNDRV_AUTO_PORT) {
93 dev_err(&devptr->dev, "specify port\n");
94 return -EINVAL;
95 }
96 if (irq[dev] == SNDRV_AUTO_IRQ) {
97 dev_err(&devptr->dev, "specify or disable IRQ\n");
98 return -EINVAL;
99 }
100 err = snd_mpu401_create(&devptr->dev, dev, &card);
101 if (err < 0)
102 return err;
103 err = snd_card_register(card);
104 if (err < 0)
105 return err;
106 platform_set_drvdata(devptr, card);
107 return 0;
108}
109
110#define SND_MPU401_DRIVER "snd_mpu401"
111
112static struct platform_driver snd_mpu401_driver = {
113 .probe = snd_mpu401_probe,
114 .driver = {
115 .name = SND_MPU401_DRIVER,
116 },
117};
118
119
120#ifdef CONFIG_PNP
121
122#define IO_EXTENT 2
123
124static const struct pnp_device_id snd_mpu401_pnpids[] = {
125 { .id = "PNPb006" },
126 { .id = "" }
127};
128
129MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
130
131static int snd_mpu401_pnp(int dev, struct pnp_dev *device,
132 const struct pnp_device_id *id)
133{
134 if (!pnp_port_valid(device, 0) ||
135 pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
136 dev_err(&device->dev, "no PnP port\n");
137 return -ENODEV;
138 }
139 if (pnp_port_len(device, 0) < IO_EXTENT) {
140 dev_err(&device->dev, "PnP port length is %llu, expected %d\n",
141 (unsigned long long)pnp_port_len(device, 0),
142 IO_EXTENT);
143 return -ENODEV;
144 }
145 port[dev] = pnp_port_start(device, 0);
146
147 if (!pnp_irq_valid(device, 0) ||
148 pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
149 dev_warn(&device->dev, "no PnP irq, using polling\n");
150 irq[dev] = -1;
151 } else {
152 irq[dev] = pnp_irq(device, 0);
153 }
154 return 0;
155}
156
157static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
158 const struct pnp_device_id *id)
159{
160 static int dev;
161 struct snd_card *card;
162 int err;
163
164 for ( ; dev < SNDRV_CARDS; ++dev) {
165 if (!enable[dev] || !pnp[dev])
166 continue;
167 err = snd_mpu401_pnp(dev, pnp_dev, id);
168 if (err < 0)
169 return err;
170 err = snd_mpu401_create(&pnp_dev->dev, dev, &card);
171 if (err < 0)
172 return err;
173 err = snd_card_register(card);
174 if (err < 0)
175 return err;
176 pnp_set_drvdata(pnp_dev, card);
177 snd_mpu401_devices++;
178 ++dev;
179 return 0;
180 }
181 return -ENODEV;
182}
183
184static struct pnp_driver snd_mpu401_pnp_driver = {
185 .name = "mpu401",
186 .id_table = snd_mpu401_pnpids,
187 .probe = snd_mpu401_pnp_probe,
188};
189#else
190static struct pnp_driver snd_mpu401_pnp_driver;
191#endif
192
193static void snd_mpu401_unregister_all(void)
194{
195 int i;
196
197 if (pnp_registered)
198 pnp_unregister_driver(&snd_mpu401_pnp_driver);
199 for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
200 platform_device_unregister(platform_devices[i]);
201 platform_driver_unregister(&snd_mpu401_driver);
202}
203
204static int __init alsa_card_mpu401_init(void)
205{
206 int i, err;
207
208 err = platform_driver_register(&snd_mpu401_driver);
209 if (err < 0)
210 return err;
211
212 for (i = 0; i < SNDRV_CARDS; i++) {
213 struct platform_device *device;
214 if (! enable[i])
215 continue;
216#ifdef CONFIG_PNP
217 if (pnp[i])
218 continue;
219#endif
220 device = platform_device_register_simple(SND_MPU401_DRIVER,
221 i, NULL, 0);
222 if (IS_ERR(device))
223 continue;
224 if (!platform_get_drvdata(device)) {
225 platform_device_unregister(device);
226 continue;
227 }
228 platform_devices[i] = device;
229 snd_mpu401_devices++;
230 }
231 err = pnp_register_driver(&snd_mpu401_pnp_driver);
232 if (!err)
233 pnp_registered = 1;
234
235 if (!snd_mpu401_devices) {
236#ifdef MODULE
237 pr_err("MPU-401 device not found or device busy\n");
238#endif
239 snd_mpu401_unregister_all();
240 return -ENODEV;
241 }
242 return 0;
243}
244
245static void __exit alsa_card_mpu401_exit(void)
246{
247 snd_mpu401_unregister_all();
248}
249
250module_init(alsa_card_mpu401_init)
251module_exit(alsa_card_mpu401_exit)