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9722c8f9 AW |
1 | /* |
2 | * ALSA interface to cx18 PCM capture streams | |
3 | * | |
4 | * Copyright (C) 2009 Andy Walls <awalls@radix.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. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
22 | * 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/init.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
9722c8f9 AW |
27 | #include <linux/module.h> |
28 | #include <linux/kernel.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/spinlock.h> | |
31 | ||
32 | #include <media/v4l2-device.h> | |
33 | ||
34 | #include <sound/core.h> | |
35 | #include <sound/initval.h> | |
36 | ||
37 | #include "cx18-driver.h" | |
4cb565cc DH |
38 | #include "cx18-version.h" |
39 | #include "cx18-alsa.h" | |
9722c8f9 AW |
40 | #include "cx18-alsa-mixer.h" |
41 | #include "cx18-alsa-pcm.h" | |
42 | ||
43 | int cx18_alsa_debug; | |
44 | ||
1ec1c9bc DH |
45 | #define CX18_DEBUG_ALSA_INFO(fmt, arg...) \ |
46 | do { \ | |
47 | if (cx18_alsa_debug & 2) \ | |
48 | printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \ | |
49 | } while (0); | |
4cb565cc | 50 | |
9722c8f9 AW |
51 | module_param_named(debug, cx18_alsa_debug, int, 0644); |
52 | MODULE_PARM_DESC(debug, | |
53 | "Debug level (bitmask). Default: 0\n" | |
54 | "\t\t\t 1/0x0001: warning\n" | |
55 | "\t\t\t 2/0x0002: info\n"); | |
56 | ||
57 | MODULE_AUTHOR("Andy Walls"); | |
58 | MODULE_DESCRIPTION("CX23418 ALSA Interface"); | |
59 | MODULE_SUPPORTED_DEVICE("CX23418 MPEG2 encoder"); | |
60 | MODULE_LICENSE("GPL"); | |
61 | ||
62 | MODULE_VERSION(CX18_VERSION); | |
63 | ||
64 | static inline | |
65 | struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev) | |
66 | { | |
67 | return to_cx18(v4l2_dev)->alsa; | |
68 | } | |
69 | ||
70 | static inline | |
71 | struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev) | |
72 | { | |
73 | return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev); | |
74 | } | |
75 | ||
76 | static void snd_cx18_card_free(struct snd_cx18_card *cxsc) | |
77 | { | |
78 | if (cxsc == NULL) | |
79 | return; | |
80 | ||
81 | if (cxsc->v4l2_dev != NULL) | |
82 | to_cx18(cxsc->v4l2_dev)->alsa = NULL; | |
83 | ||
84 | /* FIXME - take any other stopping actions needed */ | |
85 | ||
86 | kfree(cxsc); | |
87 | } | |
88 | ||
89 | static void snd_cx18_card_private_free(struct snd_card *sc) | |
90 | { | |
91 | if (sc == NULL) | |
92 | return; | |
93 | snd_cx18_card_free(sc->private_data); | |
94 | sc->private_data = NULL; | |
95 | sc->private_free = NULL; | |
96 | } | |
97 | ||
9420048c | 98 | static int snd_cx18_card_create(struct v4l2_device *v4l2_dev, |
9722c8f9 AW |
99 | struct snd_card *sc, |
100 | struct snd_cx18_card **cxsc) | |
101 | { | |
102 | *cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL); | |
103 | if (*cxsc == NULL) | |
104 | return -ENOMEM; | |
105 | ||
106 | (*cxsc)->v4l2_dev = v4l2_dev; | |
107 | (*cxsc)->sc = sc; | |
108 | ||
109 | sc->private_data = *cxsc; | |
110 | sc->private_free = snd_cx18_card_private_free; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
9420048c | 115 | static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc) |
9722c8f9 AW |
116 | { |
117 | struct cx18 *cx = to_cx18(cxsc->v4l2_dev); | |
118 | struct snd_card *sc = cxsc->sc; | |
119 | ||
120 | /* sc->driver is used by alsa-lib's configurator: simple, unique */ | |
121 | strlcpy(sc->driver, "CX23418", sizeof(sc->driver)); | |
122 | ||
123 | /* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */ | |
124 | snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d", | |
125 | cx->instance); | |
126 | ||
127 | /* sc->longname is read from /proc/asound/cards */ | |
128 | snprintf(sc->longname, sizeof(sc->longname), | |
129 | "CX23418 #%d %s TV/FM Radio/Line-In Capture", | |
130 | cx->instance, cx->card_name); | |
4cb565cc DH |
131 | |
132 | return 0; | |
9722c8f9 AW |
133 | } |
134 | ||
9420048c | 135 | static int snd_cx18_init(struct v4l2_device *v4l2_dev) |
9722c8f9 AW |
136 | { |
137 | struct cx18 *cx = to_cx18(v4l2_dev); | |
c71fd169 | 138 | struct snd_card *sc = NULL; |
9722c8f9 AW |
139 | struct snd_cx18_card *cxsc; |
140 | int ret; | |
141 | ||
142 | /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */ | |
143 | ||
144 | /* (1) Check and increment the device index */ | |
145 | /* This is a no-op for us. We'll use the cx->instance */ | |
146 | ||
147 | /* (2) Create a card instance */ | |
148 | ret = snd_card_create(SNDRV_DEFAULT_IDX1, /* use first available id */ | |
149 | SNDRV_DEFAULT_STR1, /* xid from end of shortname*/ | |
150 | THIS_MODULE, 0, &sc); | |
151 | if (ret) { | |
152 | CX18_ALSA_ERR("%s: snd_card_create() failed with err %d\n", | |
153 | __func__, ret); | |
154 | goto err_exit; | |
155 | } | |
156 | ||
157 | /* (3) Create a main component */ | |
158 | ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc); | |
159 | if (ret) { | |
160 | CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n", | |
161 | __func__, ret); | |
162 | goto err_exit_free; | |
163 | } | |
164 | ||
165 | /* (4) Set the driver ID and name strings */ | |
166 | snd_cx18_card_set_names(cxsc); | |
167 | ||
9722c8f9 AW |
168 | |
169 | ret = snd_cx18_pcm_create(cxsc); | |
170 | if (ret) { | |
171 | CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n", | |
172 | __func__, ret); | |
173 | goto err_exit_free; | |
174 | } | |
175 | /* FIXME - proc files */ | |
176 | ||
177 | /* (7) Set the driver data and return 0 */ | |
178 | /* We do this out of normal order for PCI drivers to avoid races */ | |
179 | cx->alsa = cxsc; | |
180 | ||
181 | /* (6) Register the card instance */ | |
182 | ret = snd_card_register(sc); | |
183 | if (ret) { | |
184 | cx->alsa = NULL; | |
185 | CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n", | |
186 | __func__, ret); | |
187 | goto err_exit_free; | |
188 | } | |
189 | ||
190 | return 0; | |
191 | ||
192 | err_exit_free: | |
c71fd169 DH |
193 | if (sc != NULL) |
194 | snd_card_free(sc); | |
9722c8f9 AW |
195 | err_exit: |
196 | return ret; | |
197 | } | |
198 | ||
d68b687b | 199 | int cx18_alsa_load(struct cx18 *cx) |
9722c8f9 | 200 | { |
d68b687b | 201 | struct v4l2_device *v4l2_dev = &cx->v4l2_dev; |
9722c8f9 AW |
202 | struct cx18_stream *s; |
203 | ||
204 | if (v4l2_dev == NULL) { | |
205 | printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", | |
206 | __func__); | |
207 | return 0; | |
208 | } | |
209 | ||
210 | cx = to_cx18(v4l2_dev); | |
4cb565cc DH |
211 | if (cx == NULL) { |
212 | printk(KERN_ERR "cx18-alsa cx is NULL\n"); | |
213 | return 0; | |
214 | } | |
215 | ||
9722c8f9 AW |
216 | s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
217 | if (s->video_dev == NULL) { | |
218 | CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - " | |
219 | "skipping\n", __func__); | |
220 | return 0; | |
221 | } | |
222 | ||
223 | if (cx->alsa != NULL) { | |
224 | CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n", | |
225 | __func__); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | if (snd_cx18_init(v4l2_dev)) { | |
230 | CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n", | |
231 | __func__); | |
232 | } else { | |
233 | CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance " | |
d68b687b | 234 | "\n", __func__); |
9722c8f9 AW |
235 | } |
236 | return 0; | |
237 | } | |
238 | ||
239 | static int __init cx18_alsa_init(void) | |
240 | { | |
9722c8f9 | 241 | printk(KERN_INFO "cx18-alsa: module loading...\n"); |
d68b687b DH |
242 | cx18_ext_init = &cx18_alsa_load; |
243 | return 0; | |
9722c8f9 AW |
244 | } |
245 | ||
9420048c | 246 | static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc) |
9722c8f9 | 247 | { |
4cb565cc | 248 | struct cx18 *cx = to_cx18(cxsc->v4l2_dev); |
9722c8f9 AW |
249 | |
250 | /* FIXME - pointer checks & shutdown cxsc */ | |
251 | ||
252 | snd_card_free(cxsc->sc); | |
253 | cx->alsa = NULL; | |
254 | } | |
255 | ||
9420048c | 256 | static int __exit cx18_alsa_exit_callback(struct device *dev, void *data) |
9722c8f9 AW |
257 | { |
258 | struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); | |
259 | struct snd_cx18_card *cxsc; | |
9722c8f9 AW |
260 | |
261 | if (v4l2_dev == NULL) { | |
262 | printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", | |
263 | __func__); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | cxsc = to_snd_cx18_card(v4l2_dev); | |
268 | if (cxsc == NULL) { | |
269 | CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n", | |
270 | __func__); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | snd_cx18_exit(cxsc); | |
275 | return 0; | |
276 | } | |
277 | ||
9420048c | 278 | static void __exit cx18_alsa_exit(void) |
9722c8f9 AW |
279 | { |
280 | struct device_driver *drv; | |
281 | int ret; | |
282 | ||
283 | printk(KERN_INFO "cx18-alsa: module unloading...\n"); | |
284 | ||
285 | drv = driver_find("cx18", &pci_bus_type); | |
286 | ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback); | |
287 | put_driver(drv); | |
288 | ||
d68b687b | 289 | cx18_ext_init = NULL; |
9722c8f9 AW |
290 | printk(KERN_INFO "cx18-alsa: module unload complete\n"); |
291 | } | |
292 | ||
293 | module_init(cx18_alsa_init); | |
294 | module_exit(cx18_alsa_exit); |