1
2
3
4
5
6
7
8
9
10
11#include <linux/init.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/device.h>
16#include <linux/spinlock.h>
17
18#include <media/v4l2-device.h>
19
20#include <sound/core.h>
21#include <sound/initval.h>
22
23#include "cx18-driver.h"
24#include "cx18-version.h"
25#include "cx18-alsa.h"
26#include "cx18-alsa-pcm.h"
27
28int cx18_alsa_debug;
29
30#define CX18_DEBUG_ALSA_INFO(fmt, arg...) \
31 do { \
32 if (cx18_alsa_debug & 2) \
33 printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \
34 } while (0);
35
36module_param_named(debug, cx18_alsa_debug, int, 0644);
37MODULE_PARM_DESC(debug,
38 "Debug level (bitmask). Default: 0\n"
39 "\t\t\t 1/0x0001: warning\n"
40 "\t\t\t 2/0x0002: info\n");
41
42MODULE_AUTHOR("Andy Walls");
43MODULE_DESCRIPTION("CX23418 ALSA Interface");
44MODULE_LICENSE("GPL");
45
46MODULE_VERSION(CX18_VERSION);
47
48static inline
49struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev)
50{
51 return to_cx18(v4l2_dev)->alsa;
52}
53
54static inline
55struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev)
56{
57 return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev);
58}
59
60static void snd_cx18_card_free(struct snd_cx18_card *cxsc)
61{
62 if (cxsc == NULL)
63 return;
64
65 if (cxsc->v4l2_dev != NULL)
66 to_cx18(cxsc->v4l2_dev)->alsa = NULL;
67
68
69
70 kfree(cxsc);
71}
72
73static void snd_cx18_card_private_free(struct snd_card *sc)
74{
75 if (sc == NULL)
76 return;
77 snd_cx18_card_free(sc->private_data);
78 sc->private_data = NULL;
79 sc->private_free = NULL;
80}
81
82static int snd_cx18_card_create(struct v4l2_device *v4l2_dev,
83 struct snd_card *sc,
84 struct snd_cx18_card **cxsc)
85{
86 *cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL);
87 if (*cxsc == NULL)
88 return -ENOMEM;
89
90 (*cxsc)->v4l2_dev = v4l2_dev;
91 (*cxsc)->sc = sc;
92
93 sc->private_data = *cxsc;
94 sc->private_free = snd_cx18_card_private_free;
95
96 return 0;
97}
98
99static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc)
100{
101 struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
102 struct snd_card *sc = cxsc->sc;
103
104
105 strscpy(sc->driver, "CX23418", sizeof(sc->driver));
106
107
108 snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d",
109 cx->instance);
110
111
112 snprintf(sc->longname, sizeof(sc->longname),
113 "CX23418 #%d %s TV/FM Radio/Line-In Capture",
114 cx->instance, cx->card_name);
115
116 return 0;
117}
118
119static int snd_cx18_init(struct v4l2_device *v4l2_dev)
120{
121 struct cx18 *cx = to_cx18(v4l2_dev);
122 struct snd_card *sc = NULL;
123 struct snd_cx18_card *cxsc;
124 int ret;
125
126
127
128
129
130
131
132 ret = snd_card_new(&cx->pci_dev->dev,
133 SNDRV_DEFAULT_IDX1,
134 SNDRV_DEFAULT_STR1,
135 THIS_MODULE, 0, &sc);
136 if (ret) {
137 CX18_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
138 __func__, ret);
139 goto err_exit;
140 }
141
142
143 ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc);
144 if (ret) {
145 CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n",
146 __func__, ret);
147 goto err_exit_free;
148 }
149
150
151 snd_cx18_card_set_names(cxsc);
152
153
154 ret = snd_cx18_pcm_create(cxsc);
155 if (ret) {
156 CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
157 __func__, ret);
158 goto err_exit_free;
159 }
160
161
162
163
164 cx->alsa = cxsc;
165
166
167 ret = snd_card_register(sc);
168 if (ret) {
169 cx->alsa = NULL;
170 CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
171 __func__, ret);
172 goto err_exit_free;
173 }
174
175 return 0;
176
177err_exit_free:
178 if (sc != NULL)
179 snd_card_free(sc);
180 kfree(cxsc);
181err_exit:
182 return ret;
183}
184
185static int cx18_alsa_load(struct cx18 *cx)
186{
187 struct v4l2_device *v4l2_dev = &cx->v4l2_dev;
188 struct cx18_stream *s;
189
190 if (v4l2_dev == NULL) {
191 printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
192 __func__);
193 return 0;
194 }
195
196 cx = to_cx18(v4l2_dev);
197 if (cx == NULL) {
198 printk(KERN_ERR "cx18-alsa cx is NULL\n");
199 return 0;
200 }
201
202 s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
203 if (s->video_dev.v4l2_dev == NULL) {
204 CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - skipping\n",
205 __func__);
206 return 0;
207 }
208
209 if (cx->alsa != NULL) {
210 CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n",
211 __func__);
212 return 0;
213 }
214
215 if (snd_cx18_init(v4l2_dev)) {
216 CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n",
217 __func__);
218 } else {
219 CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance\n",
220 __func__);
221 }
222 return 0;
223}
224
225static int __init cx18_alsa_init(void)
226{
227 printk(KERN_INFO "cx18-alsa: module loading...\n");
228 cx18_ext_init = &cx18_alsa_load;
229 return 0;
230}
231
232static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc)
233{
234 struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
235
236
237
238 snd_card_free(cxsc->sc);
239 cx->alsa = NULL;
240}
241
242static int __exit cx18_alsa_exit_callback(struct device *dev, void *data)
243{
244 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
245 struct snd_cx18_card *cxsc;
246
247 if (v4l2_dev == NULL) {
248 printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
249 __func__);
250 return 0;
251 }
252
253 cxsc = to_snd_cx18_card(v4l2_dev);
254 if (cxsc == NULL) {
255 CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n",
256 __func__);
257 return 0;
258 }
259
260 snd_cx18_exit(cxsc);
261 return 0;
262}
263
264static void __exit cx18_alsa_exit(void)
265{
266 struct device_driver *drv;
267 int ret;
268
269 printk(KERN_INFO "cx18-alsa: module unloading...\n");
270
271 drv = driver_find("cx18", &pci_bus_type);
272 ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback);
273 (void)ret;
274
275 cx18_ext_init = NULL;
276 printk(KERN_INFO "cx18-alsa: module unload complete\n");
277}
278
279module_init(cx18_alsa_init);
280module_exit(cx18_alsa_exit);
281
