1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  ALSA interface to ivtv PCM capture streams
4  *
5  *  Copyright (C) 2009,2012  Andy Walls <awalls@md.metrocast.net>
6  *  Copyright (C) 2009  Devin Heitmueller <dheitmueller@kernellabs.com>
7  *
8  *  Portions of this work were sponsored by ONELAN Limited for the cx18 driver
9  */
10 
11 #include "ivtv-driver.h"
12 #include "ivtv-version.h"
13 #include "ivtv-alsa.h"
14 #include "ivtv-alsa-pcm.h"
15 
16 #include <sound/core.h>
17 #include <sound/initval.h>
18 
19 int ivtv_alsa_debug;
20 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
21 
22 #define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \
23 	do { \
24 		if (ivtv_alsa_debug & 2) \
25 			printk(KERN_INFO pr_fmt("%s: alsa:" __fmt),	\
26 			       __func__, ##__arg);			\
27 	} while (0)
28 
29 module_param_named(debug, ivtv_alsa_debug, int, 0644);
30 MODULE_PARM_DESC(debug,
31 		 "Debug level (bitmask). Default: 0\n"
32 		 "\t\t\t  1/0x0001: warning\n"
33 		 "\t\t\t  2/0x0002: info\n");
34 
35 module_param_array(index, int, NULL, 0444);
36 MODULE_PARM_DESC(index,
37 		 "Index value for IVTV ALSA capture interface(s).\n");
38 
39 MODULE_AUTHOR("Andy Walls");
40 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
41 MODULE_LICENSE("GPL");
42 
43 MODULE_VERSION(IVTV_VERSION);
44 
45 static inline
to_snd_ivtv_card(struct v4l2_device * v4l2_dev)46 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
47 {
48 	return to_ivtv(v4l2_dev)->alsa;
49 }
50 
snd_ivtv_card_free(struct snd_ivtv_card * itvsc)51 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
52 {
53 	if (itvsc == NULL)
54 		return;
55 
56 	if (itvsc->v4l2_dev != NULL)
57 		to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
58 
59 	/* FIXME - take any other stopping actions needed */
60 
61 	kfree(itvsc);
62 }
63 
snd_ivtv_card_private_free(struct snd_card * sc)64 static void snd_ivtv_card_private_free(struct snd_card *sc)
65 {
66 	if (sc == NULL)
67 		return;
68 	snd_ivtv_card_free(sc->private_data);
69 	sc->private_data = NULL;
70 	sc->private_free = NULL;
71 }
72 
snd_ivtv_card_create(struct v4l2_device * v4l2_dev,struct snd_card * sc,struct snd_ivtv_card ** itvsc)73 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
74 				       struct snd_card *sc,
75 				       struct snd_ivtv_card **itvsc)
76 {
77 	*itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
78 	if (*itvsc == NULL)
79 		return -ENOMEM;
80 
81 	(*itvsc)->v4l2_dev = v4l2_dev;
82 	(*itvsc)->sc = sc;
83 
84 	sc->private_data = *itvsc;
85 	sc->private_free = snd_ivtv_card_private_free;
86 
87 	return 0;
88 }
89 
snd_ivtv_card_set_names(struct snd_ivtv_card * itvsc)90 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
91 {
92 	struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
93 	struct snd_card *sc = itvsc->sc;
94 
95 	/* sc->driver is used by alsa-lib's configurator: simple, unique */
96 	strscpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
97 
98 	/* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
99 	snprintf(sc->shortname,  sizeof(sc->shortname), "IVTV-%d",
100 		 itv->instance);
101 
102 	/* sc->longname is read from /proc/asound/cards */
103 	snprintf(sc->longname, sizeof(sc->longname),
104 		 "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
105 		 itv->instance, itv->card_name);
106 
107 	return 0;
108 }
109 
snd_ivtv_init(struct v4l2_device * v4l2_dev)110 static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
111 {
112 	struct ivtv *itv = to_ivtv(v4l2_dev);
113 	struct snd_card *sc = NULL;
114 	struct snd_ivtv_card *itvsc;
115 	int ret, idx;
116 
117 	/* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
118 
119 	/* (1) Check and increment the device index */
120 	/* This is a no-op for us.  We'll use the itv->instance */
121 
122 	/* (2) Create a card instance */
123 	/* use first available id if not specified otherwise*/
124 	idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
125 	ret = snd_card_new(&itv->pdev->dev,
126 			   idx,
127 			   SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
128 			   THIS_MODULE, 0, &sc);
129 	if (ret) {
130 		IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
131 			      __func__, ret);
132 		goto err_exit;
133 	}
134 
135 	/* (3) Create a main component */
136 	ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
137 	if (ret) {
138 		IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
139 			      __func__, ret);
140 		goto err_exit_free;
141 	}
142 
143 	/* (4) Set the driver ID and name strings */
144 	snd_ivtv_card_set_names(itvsc);
145 
146 	/* (5) Create other components: PCM, & proc files */
147 	ret = snd_ivtv_pcm_create(itvsc);
148 	if (ret) {
149 		IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
150 			      __func__, ret);
151 		goto err_exit_free;
152 	}
153 	/* FIXME - proc files */
154 
155 	/* (7) Set the driver data and return 0 */
156 	/* We do this out of normal order for PCI drivers to avoid races */
157 	itv->alsa = itvsc;
158 
159 	/* (6) Register the card instance */
160 	ret = snd_card_register(sc);
161 	if (ret) {
162 		itv->alsa = NULL;
163 		IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
164 			      __func__, ret);
165 		goto err_exit_free;
166 	}
167 
168 	IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
169 			 __func__, itv->instance, sc->number);
170 
171 	return 0;
172 
173 err_exit_free:
174 	if (sc != NULL)
175 		snd_card_free(sc);
176 	kfree(itvsc);
177 err_exit:
178 	return ret;
179 }
180 
ivtv_alsa_load(struct ivtv * itv)181 static int ivtv_alsa_load(struct ivtv *itv)
182 {
183 	struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
184 	struct ivtv_stream *s;
185 
186 	if (v4l2_dev == NULL) {
187 		pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
188 		       __func__);
189 		return 0;
190 	}
191 
192 	itv = to_ivtv(v4l2_dev);
193 	if (itv == NULL) {
194 		pr_err("ivtv-alsa itv is NULL\n");
195 		return 0;
196 	}
197 
198 	s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
199 	if (s->vdev.v4l2_dev == NULL) {
200 		IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");
201 		return 0;
202 	}
203 
204 	if (itv->alsa != NULL) {
205 		IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
206 			      __func__);
207 		return 0;
208 	}
209 
210 	if (snd_ivtv_init(v4l2_dev)) {
211 		IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
212 			      __func__);
213 	} else {
214 		IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");
215 	}
216 	return 0;
217 }
218 
ivtv_alsa_init(void)219 static int __init ivtv_alsa_init(void)
220 {
221 	pr_info("ivtv-alsa: module loading...\n");
222 	ivtv_ext_init = &ivtv_alsa_load;
223 	return 0;
224 }
225 
snd_ivtv_exit(struct snd_ivtv_card * itvsc)226 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
227 {
228 	struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
229 
230 	/* FIXME - pointer checks & shutdown itvsc */
231 
232 	snd_card_free(itvsc->sc);
233 	itv->alsa = NULL;
234 }
235 
ivtv_alsa_exit_callback(struct device * dev,void * data)236 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
237 {
238 	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
239 	struct snd_ivtv_card *itvsc;
240 
241 	if (v4l2_dev == NULL) {
242 		pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
243 		       __func__);
244 		return 0;
245 	}
246 
247 	itvsc = to_snd_ivtv_card(v4l2_dev);
248 	if (itvsc == NULL) {
249 		IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
250 			       __func__);
251 		return 0;
252 	}
253 
254 	snd_ivtv_exit(itvsc);
255 	return 0;
256 }
257 
ivtv_alsa_exit(void)258 static void __exit ivtv_alsa_exit(void)
259 {
260 	struct device_driver *drv;
261 	int ret;
262 
263 	pr_info("ivtv-alsa: module unloading...\n");
264 
265 	drv = driver_find("ivtv", &pci_bus_type);
266 	ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
267 	(void)ret;	/* suppress compiler warning */
268 
269 	ivtv_ext_init = NULL;
270 	pr_info("ivtv-alsa: module unload complete\n");
271 }
272 
273 module_init(ivtv_alsa_init);
274 module_exit(ivtv_alsa_exit);
275