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9722c8f9 AW |
1 | /* |
2 | * ALSA interface to cx18 PCM capture streams | |
3 | * | |
6afdeaf8 | 4 | * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net> |
4cb565cc DH |
5 | * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> |
6 | * | |
7 | * Portions of this work were sponsored by ONELAN Limited. | |
9722c8f9 AW |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
9722c8f9 AW |
18 | */ |
19 | ||
20 | #include <linux/init.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
9722c8f9 AW |
22 | #include <linux/module.h> |
23 | #include <linux/kernel.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/spinlock.h> | |
26 | ||
27 | #include <media/v4l2-device.h> | |
28 | ||
29 | #include <sound/core.h> | |
30 | #include <sound/initval.h> | |
31 | ||
32 | #include "cx18-driver.h" | |
4cb565cc DH |
33 | #include "cx18-version.h" |
34 | #include "cx18-alsa.h" | |
9722c8f9 AW |
35 | #include "cx18-alsa-mixer.h" |
36 | #include "cx18-alsa-pcm.h" | |
37 | ||
38 | int cx18_alsa_debug; | |
39 | ||
1ec1c9bc DH |
40 | #define CX18_DEBUG_ALSA_INFO(fmt, arg...) \ |
41 | do { \ | |
42 | if (cx18_alsa_debug & 2) \ | |
43 | printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \ | |
44 | } while (0); | |
4cb565cc | 45 | |
9722c8f9 AW |
46 | module_param_named(debug, cx18_alsa_debug, int, 0644); |
47 | MODULE_PARM_DESC(debug, | |
48 | "Debug level (bitmask). Default: 0\n" | |
49 | "\t\t\t 1/0x0001: warning\n" | |
50 | "\t\t\t 2/0x0002: info\n"); | |
51 | ||
52 | MODULE_AUTHOR("Andy Walls"); | |
53 | MODULE_DESCRIPTION("CX23418 ALSA Interface"); | |
54 | MODULE_SUPPORTED_DEVICE("CX23418 MPEG2 encoder"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | MODULE_VERSION(CX18_VERSION); | |
58 | ||
59 | static inline | |
60 | struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev) | |
61 | { | |
62 | return to_cx18(v4l2_dev)->alsa; | |
63 | } | |
64 | ||
65 | static inline | |
66 | struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev) | |
67 | { | |
68 | return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev); | |
69 | } | |
70 | ||
71 | static void snd_cx18_card_free(struct snd_cx18_card *cxsc) | |
72 | { | |
73 | if (cxsc == NULL) | |
74 | return; | |
75 | ||
76 | if (cxsc->v4l2_dev != NULL) | |
77 | to_cx18(cxsc->v4l2_dev)->alsa = NULL; | |
78 | ||
79 | /* FIXME - take any other stopping actions needed */ | |
80 | ||
81 | kfree(cxsc); | |
82 | } | |
83 | ||
84 | static void snd_cx18_card_private_free(struct snd_card *sc) | |
85 | { | |
86 | if (sc == NULL) | |
87 | return; | |
88 | snd_cx18_card_free(sc->private_data); | |
89 | sc->private_data = NULL; | |
90 | sc->private_free = NULL; | |
91 | } | |
92 | ||
9420048c | 93 | static int snd_cx18_card_create(struct v4l2_device *v4l2_dev, |
9722c8f9 AW |
94 | struct snd_card *sc, |
95 | struct snd_cx18_card **cxsc) | |
96 | { | |
97 | *cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL); | |
98 | if (*cxsc == NULL) | |
99 | return -ENOMEM; | |
100 | ||
101 | (*cxsc)->v4l2_dev = v4l2_dev; | |
102 | (*cxsc)->sc = sc; | |
103 | ||
104 | sc->private_data = *cxsc; | |
105 | sc->private_free = snd_cx18_card_private_free; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
9420048c | 110 | static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc) |
9722c8f9 AW |
111 | { |
112 | struct cx18 *cx = to_cx18(cxsc->v4l2_dev); | |
113 | struct snd_card *sc = cxsc->sc; | |
114 | ||
115 | /* sc->driver is used by alsa-lib's configurator: simple, unique */ | |
116 | strlcpy(sc->driver, "CX23418", sizeof(sc->driver)); | |
117 | ||
118 | /* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */ | |
119 | snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d", | |
120 | cx->instance); | |
121 | ||
122 | /* sc->longname is read from /proc/asound/cards */ | |
123 | snprintf(sc->longname, sizeof(sc->longname), | |
124 | "CX23418 #%d %s TV/FM Radio/Line-In Capture", | |
125 | cx->instance, cx->card_name); | |
4cb565cc DH |
126 | |
127 | return 0; | |
9722c8f9 AW |
128 | } |
129 | ||
9420048c | 130 | static int snd_cx18_init(struct v4l2_device *v4l2_dev) |
9722c8f9 AW |
131 | { |
132 | struct cx18 *cx = to_cx18(v4l2_dev); | |
c71fd169 | 133 | struct snd_card *sc = NULL; |
9722c8f9 AW |
134 | struct snd_cx18_card *cxsc; |
135 | int ret; | |
136 | ||
137 | /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */ | |
138 | ||
139 | /* (1) Check and increment the device index */ | |
140 | /* This is a no-op for us. We'll use the cx->instance */ | |
141 | ||
142 | /* (2) Create a card instance */ | |
e7356888 TI |
143 | ret = snd_card_new(&cx->pci_dev->dev, |
144 | SNDRV_DEFAULT_IDX1, /* use first available id */ | |
145 | SNDRV_DEFAULT_STR1, /* xid from end of shortname*/ | |
146 | THIS_MODULE, 0, &sc); | |
9722c8f9 | 147 | if (ret) { |
e7356888 | 148 | CX18_ALSA_ERR("%s: snd_card_new() failed with err %d\n", |
9722c8f9 AW |
149 | __func__, ret); |
150 | goto err_exit; | |
151 | } | |
152 | ||
153 | /* (3) Create a main component */ | |
154 | ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc); | |
155 | if (ret) { | |
156 | CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n", | |
157 | __func__, ret); | |
158 | goto err_exit_free; | |
159 | } | |
160 | ||
161 | /* (4) Set the driver ID and name strings */ | |
162 | snd_cx18_card_set_names(cxsc); | |
163 | ||
9722c8f9 AW |
164 | |
165 | ret = snd_cx18_pcm_create(cxsc); | |
166 | if (ret) { | |
167 | CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n", | |
168 | __func__, ret); | |
169 | goto err_exit_free; | |
170 | } | |
171 | /* FIXME - proc files */ | |
172 | ||
173 | /* (7) Set the driver data and return 0 */ | |
174 | /* We do this out of normal order for PCI drivers to avoid races */ | |
175 | cx->alsa = cxsc; | |
176 | ||
177 | /* (6) Register the card instance */ | |
178 | ret = snd_card_register(sc); | |
179 | if (ret) { | |
180 | cx->alsa = NULL; | |
181 | CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n", | |
182 | __func__, ret); | |
183 | goto err_exit_free; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | ||
188 | err_exit_free: | |
c71fd169 DH |
189 | if (sc != NULL) |
190 | snd_card_free(sc); | |
2c87d9db | 191 | kfree(cxsc); |
9722c8f9 AW |
192 | err_exit: |
193 | return ret; | |
194 | } | |
195 | ||
cfb046cb | 196 | static int cx18_alsa_load(struct cx18 *cx) |
9722c8f9 | 197 | { |
d68b687b | 198 | struct v4l2_device *v4l2_dev = &cx->v4l2_dev; |
9722c8f9 AW |
199 | struct cx18_stream *s; |
200 | ||
201 | if (v4l2_dev == NULL) { | |
202 | printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", | |
203 | __func__); | |
204 | return 0; | |
205 | } | |
206 | ||
207 | cx = to_cx18(v4l2_dev); | |
4cb565cc DH |
208 | if (cx == NULL) { |
209 | printk(KERN_ERR "cx18-alsa cx is NULL\n"); | |
210 | return 0; | |
211 | } | |
212 | ||
9722c8f9 | 213 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
08569d64 | 214 | if (s->video_dev.v4l2_dev == NULL) { |
6beb1388 MCC |
215 | CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - skipping\n", |
216 | __func__); | |
9722c8f9 AW |
217 | return 0; |
218 | } | |
219 | ||
220 | if (cx->alsa != NULL) { | |
221 | CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n", | |
222 | __func__); | |
223 | return 0; | |
224 | } | |
225 | ||
226 | if (snd_cx18_init(v4l2_dev)) { | |
227 | CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n", | |
228 | __func__); | |
229 | } else { | |
6beb1388 MCC |
230 | CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance\n", |
231 | __func__); | |
9722c8f9 AW |
232 | } |
233 | return 0; | |
234 | } | |
235 | ||
236 | static int __init cx18_alsa_init(void) | |
237 | { | |
9722c8f9 | 238 | printk(KERN_INFO "cx18-alsa: module loading...\n"); |
d68b687b DH |
239 | cx18_ext_init = &cx18_alsa_load; |
240 | return 0; | |
9722c8f9 AW |
241 | } |
242 | ||
9420048c | 243 | static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc) |
9722c8f9 | 244 | { |
4cb565cc | 245 | struct cx18 *cx = to_cx18(cxsc->v4l2_dev); |
9722c8f9 AW |
246 | |
247 | /* FIXME - pointer checks & shutdown cxsc */ | |
248 | ||
249 | snd_card_free(cxsc->sc); | |
250 | cx->alsa = NULL; | |
251 | } | |
252 | ||
9420048c | 253 | static int __exit cx18_alsa_exit_callback(struct device *dev, void *data) |
9722c8f9 AW |
254 | { |
255 | struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); | |
256 | struct snd_cx18_card *cxsc; | |
9722c8f9 AW |
257 | |
258 | if (v4l2_dev == NULL) { | |
259 | printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", | |
260 | __func__); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | cxsc = to_snd_cx18_card(v4l2_dev); | |
265 | if (cxsc == NULL) { | |
266 | CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n", | |
267 | __func__); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | snd_cx18_exit(cxsc); | |
272 | return 0; | |
273 | } | |
274 | ||
9420048c | 275 | static void __exit cx18_alsa_exit(void) |
9722c8f9 AW |
276 | { |
277 | struct device_driver *drv; | |
278 | int ret; | |
279 | ||
280 | printk(KERN_INFO "cx18-alsa: module unloading...\n"); | |
281 | ||
282 | drv = driver_find("cx18", &pci_bus_type); | |
283 | ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback); | |
932205a7 | 284 | (void)ret; /* suppress compiler warning */ |
9722c8f9 | 285 | |
d68b687b | 286 | cx18_ext_init = NULL; |
9722c8f9 AW |
287 | printk(KERN_INFO "cx18-alsa: module unload complete\n"); |
288 | } | |
289 | ||
290 | module_init(cx18_alsa_init); | |
291 | module_exit(cx18_alsa_exit); |