1 /* 2 * ALSA interface to ivtv PCM capture streams 3 * 4 * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net> 5 * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> 6 * 7 * Portions of this work were sponsored by ONELAN Limited for the cx18 driver 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 20 #include "ivtv-driver.h" 21 #include "ivtv-version.h" 22 #include "ivtv-alsa.h" 23 #include "ivtv-alsa-mixer.h" 24 #include "ivtv-alsa-pcm.h" 25 26 #include <sound/core.h> 27 #include <sound/initval.h> 28 29 int ivtv_alsa_debug; 30 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; 31 32 #define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \ 33 do { \ 34 if (ivtv_alsa_debug & 2) \ 35 printk(KERN_INFO pr_fmt("%s: alsa:" __fmt), \ 36 __func__, ##__arg); \ 37 } while (0) 38 39 module_param_named(debug, ivtv_alsa_debug, int, 0644); 40 MODULE_PARM_DESC(debug, 41 "Debug level (bitmask). Default: 0\n" 42 "\t\t\t 1/0x0001: warning\n" 43 "\t\t\t 2/0x0002: info\n"); 44 45 module_param_array(index, int, NULL, 0444); 46 MODULE_PARM_DESC(index, 47 "Index value for IVTV ALSA capture interface(s).\n"); 48 49 MODULE_AUTHOR("Andy Walls"); 50 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface"); 51 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder"); 52 MODULE_LICENSE("GPL"); 53 54 MODULE_VERSION(IVTV_VERSION); 55 56 static inline 57 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev) 58 { 59 return to_ivtv(v4l2_dev)->alsa; 60 } 61 62 static inline 63 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev) 64 { 65 return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev); 66 } 67 68 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc) 69 { 70 if (itvsc == NULL) 71 return; 72 73 if (itvsc->v4l2_dev != NULL) 74 to_ivtv(itvsc->v4l2_dev)->alsa = NULL; 75 76 /* FIXME - take any other stopping actions needed */ 77 78 kfree(itvsc); 79 } 80 81 static void snd_ivtv_card_private_free(struct snd_card *sc) 82 { 83 if (sc == NULL) 84 return; 85 snd_ivtv_card_free(sc->private_data); 86 sc->private_data = NULL; 87 sc->private_free = NULL; 88 } 89 90 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev, 91 struct snd_card *sc, 92 struct snd_ivtv_card **itvsc) 93 { 94 *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL); 95 if (*itvsc == NULL) 96 return -ENOMEM; 97 98 (*itvsc)->v4l2_dev = v4l2_dev; 99 (*itvsc)->sc = sc; 100 101 sc->private_data = *itvsc; 102 sc->private_free = snd_ivtv_card_private_free; 103 104 return 0; 105 } 106 107 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc) 108 { 109 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); 110 struct snd_card *sc = itvsc->sc; 111 112 /* sc->driver is used by alsa-lib's configurator: simple, unique */ 113 strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver)); 114 115 /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */ 116 snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d", 117 itv->instance); 118 119 /* sc->longname is read from /proc/asound/cards */ 120 snprintf(sc->longname, sizeof(sc->longname), 121 "CX2341[56] #%d %s TV/FM Radio/Line-In Capture", 122 itv->instance, itv->card_name); 123 124 return 0; 125 } 126 127 static int snd_ivtv_init(struct v4l2_device *v4l2_dev) 128 { 129 struct ivtv *itv = to_ivtv(v4l2_dev); 130 struct snd_card *sc = NULL; 131 struct snd_ivtv_card *itvsc; 132 int ret, idx; 133 134 /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */ 135 136 /* (1) Check and increment the device index */ 137 /* This is a no-op for us. We'll use the itv->instance */ 138 139 /* (2) Create a card instance */ 140 /* use first available id if not specified otherwise*/ 141 idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance]; 142 ret = snd_card_new(&itv->pdev->dev, 143 idx, 144 SNDRV_DEFAULT_STR1, /* xid from end of shortname*/ 145 THIS_MODULE, 0, &sc); 146 if (ret) { 147 IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n", 148 __func__, ret); 149 goto err_exit; 150 } 151 152 /* (3) Create a main component */ 153 ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc); 154 if (ret) { 155 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n", 156 __func__, ret); 157 goto err_exit_free; 158 } 159 160 /* (4) Set the driver ID and name strings */ 161 snd_ivtv_card_set_names(itvsc); 162 163 /* (5) Create other components: mixer, PCM, & proc files */ 164 #if 0 165 ret = snd_ivtv_mixer_create(itvsc); 166 if (ret) { 167 IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d: proceeding anyway\n", 168 __func__, ret); 169 } 170 #endif 171 172 ret = snd_ivtv_pcm_create(itvsc); 173 if (ret) { 174 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n", 175 __func__, ret); 176 goto err_exit_free; 177 } 178 /* FIXME - proc files */ 179 180 /* (7) Set the driver data and return 0 */ 181 /* We do this out of normal order for PCI drivers to avoid races */ 182 itv->alsa = itvsc; 183 184 /* (6) Register the card instance */ 185 ret = snd_card_register(sc); 186 if (ret) { 187 itv->alsa = NULL; 188 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n", 189 __func__, ret); 190 goto err_exit_free; 191 } 192 193 IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n", 194 __func__, itv->instance, sc->number); 195 196 return 0; 197 198 err_exit_free: 199 if (sc != NULL) 200 snd_card_free(sc); 201 kfree(itvsc); 202 err_exit: 203 return ret; 204 } 205 206 static int ivtv_alsa_load(struct ivtv *itv) 207 { 208 struct v4l2_device *v4l2_dev = &itv->v4l2_dev; 209 struct ivtv_stream *s; 210 211 if (v4l2_dev == NULL) { 212 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n", 213 __func__); 214 return 0; 215 } 216 217 itv = to_ivtv(v4l2_dev); 218 if (itv == NULL) { 219 pr_err("ivtv-alsa itv is NULL\n"); 220 return 0; 221 } 222 223 s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM]; 224 if (s->vdev.v4l2_dev == NULL) { 225 IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n"); 226 return 0; 227 } 228 229 if (itv->alsa != NULL) { 230 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n", 231 __func__); 232 return 0; 233 } 234 235 if (snd_ivtv_init(v4l2_dev)) { 236 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n", 237 __func__); 238 } else { 239 IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n"); 240 } 241 return 0; 242 } 243 244 static int __init ivtv_alsa_init(void) 245 { 246 pr_info("ivtv-alsa: module loading...\n"); 247 ivtv_ext_init = &ivtv_alsa_load; 248 return 0; 249 } 250 251 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc) 252 { 253 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); 254 255 /* FIXME - pointer checks & shutdown itvsc */ 256 257 snd_card_free(itvsc->sc); 258 itv->alsa = NULL; 259 } 260 261 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data) 262 { 263 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); 264 struct snd_ivtv_card *itvsc; 265 266 if (v4l2_dev == NULL) { 267 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n", 268 __func__); 269 return 0; 270 } 271 272 itvsc = to_snd_ivtv_card(v4l2_dev); 273 if (itvsc == NULL) { 274 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n", 275 __func__); 276 return 0; 277 } 278 279 snd_ivtv_exit(itvsc); 280 return 0; 281 } 282 283 static void __exit ivtv_alsa_exit(void) 284 { 285 struct device_driver *drv; 286 int ret; 287 288 pr_info("ivtv-alsa: module unloading...\n"); 289 290 drv = driver_find("ivtv", &pci_bus_type); 291 ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback); 292 (void)ret; /* suppress compiler warning */ 293 294 ivtv_ext_init = NULL; 295 pr_info("ivtv-alsa: module unload complete\n"); 296 } 297 298 module_init(ivtv_alsa_init); 299 module_exit(ivtv_alsa_exit); 300