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 * 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> 26 #include <linux/slab.h> 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 "ivtv-driver.h" 38 #include "ivtv-version.h" 39 #include "ivtv-alsa.h" 40 #include "ivtv-alsa-mixer.h" 41 #include "ivtv-alsa-pcm.h" 42 43 int ivtv_alsa_debug; 44 45 #define IVTV_DEBUG_ALSA_INFO(fmt, arg...) \ 46 do { \ 47 if (ivtv_alsa_debug & 2) \ 48 pr_info("%s: " fmt, "ivtv-alsa", ## arg); \ 49 } while (0) 50 51 module_param_named(debug, ivtv_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("CX23415/CX23416 ALSA Interface"); 59 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder"); 60 MODULE_LICENSE("GPL"); 61 62 MODULE_VERSION(IVTV_VERSION); 63 64 static inline 65 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev) 66 { 67 return to_ivtv(v4l2_dev)->alsa; 68 } 69 70 static inline 71 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev) 72 { 73 return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev); 74 } 75 76 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc) 77 { 78 if (itvsc == NULL) 79 return; 80 81 if (itvsc->v4l2_dev != NULL) 82 to_ivtv(itvsc->v4l2_dev)->alsa = NULL; 83 84 /* FIXME - take any other stopping actions needed */ 85 86 kfree(itvsc); 87 } 88 89 static void snd_ivtv_card_private_free(struct snd_card *sc) 90 { 91 if (sc == NULL) 92 return; 93 snd_ivtv_card_free(sc->private_data); 94 sc->private_data = NULL; 95 sc->private_free = NULL; 96 } 97 98 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev, 99 struct snd_card *sc, 100 struct snd_ivtv_card **itvsc) 101 { 102 *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL); 103 if (*itvsc == NULL) 104 return -ENOMEM; 105 106 (*itvsc)->v4l2_dev = v4l2_dev; 107 (*itvsc)->sc = sc; 108 109 sc->private_data = *itvsc; 110 sc->private_free = snd_ivtv_card_private_free; 111 112 return 0; 113 } 114 115 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc) 116 { 117 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); 118 struct snd_card *sc = itvsc->sc; 119 120 /* sc->driver is used by alsa-lib's configurator: simple, unique */ 121 strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver)); 122 123 /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */ 124 snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d", 125 itv->instance); 126 127 /* sc->longname is read from /proc/asound/cards */ 128 snprintf(sc->longname, sizeof(sc->longname), 129 "CX2341[56] #%d %s TV/FM Radio/Line-In Capture", 130 itv->instance, itv->card_name); 131 132 return 0; 133 } 134 135 static int snd_ivtv_init(struct v4l2_device *v4l2_dev) 136 { 137 struct ivtv *itv = to_ivtv(v4l2_dev); 138 struct snd_card *sc = NULL; 139 struct snd_ivtv_card *itvsc; 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 itv->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 IVTV_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_ivtv_card_create(v4l2_dev, sc, &itvsc); 159 if (ret) { 160 IVTV_ALSA_ERR("%s: snd_ivtv_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_ivtv_card_set_names(itvsc); 167 168 /* (5) Create other components: mixer, PCM, & proc files */ 169 #if 0 170 ret = snd_ivtv_mixer_create(itvsc); 171 if (ret) { 172 IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d:" 173 " proceeding anyway\n", __func__, ret); 174 } 175 #endif 176 177 ret = snd_ivtv_pcm_create(itvsc); 178 if (ret) { 179 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n", 180 __func__, ret); 181 goto err_exit_free; 182 } 183 /* FIXME - proc files */ 184 185 /* (7) Set the driver data and return 0 */ 186 /* We do this out of normal order for PCI drivers to avoid races */ 187 itv->alsa = itvsc; 188 189 /* (6) Register the card instance */ 190 ret = snd_card_register(sc); 191 if (ret) { 192 itv->alsa = NULL; 193 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n", 194 __func__, ret); 195 goto err_exit_free; 196 } 197 198 return 0; 199 200 err_exit_free: 201 if (sc != NULL) 202 snd_card_free(sc); 203 kfree(itvsc); 204 err_exit: 205 return ret; 206 } 207 208 static int ivtv_alsa_load(struct ivtv *itv) 209 { 210 struct v4l2_device *v4l2_dev = &itv->v4l2_dev; 211 struct ivtv_stream *s; 212 213 if (v4l2_dev == NULL) { 214 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n", 215 __func__); 216 return 0; 217 } 218 219 itv = to_ivtv(v4l2_dev); 220 if (itv == NULL) { 221 pr_err("ivtv-alsa itv is NULL\n"); 222 return 0; 223 } 224 225 s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM]; 226 if (s->vdev == NULL) { 227 IVTV_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - " 228 "skipping\n", __func__); 229 return 0; 230 } 231 232 if (itv->alsa != NULL) { 233 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n", 234 __func__); 235 return 0; 236 } 237 238 if (snd_ivtv_init(v4l2_dev)) { 239 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n", 240 __func__); 241 } else { 242 IVTV_DEBUG_ALSA_INFO("%s: created ivtv ALSA interface instance " 243 "\n", __func__); 244 } 245 return 0; 246 } 247 248 static int __init ivtv_alsa_init(void) 249 { 250 pr_info("ivtv-alsa: module loading...\n"); 251 ivtv_ext_init = &ivtv_alsa_load; 252 return 0; 253 } 254 255 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc) 256 { 257 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); 258 259 /* FIXME - pointer checks & shutdown itvsc */ 260 261 snd_card_free(itvsc->sc); 262 itv->alsa = NULL; 263 } 264 265 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data) 266 { 267 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); 268 struct snd_ivtv_card *itvsc; 269 270 if (v4l2_dev == NULL) { 271 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n", 272 __func__); 273 return 0; 274 } 275 276 itvsc = to_snd_ivtv_card(v4l2_dev); 277 if (itvsc == NULL) { 278 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n", 279 __func__); 280 return 0; 281 } 282 283 snd_ivtv_exit(itvsc); 284 return 0; 285 } 286 287 static void __exit ivtv_alsa_exit(void) 288 { 289 struct device_driver *drv; 290 int ret; 291 292 pr_info("ivtv-alsa: module unloading...\n"); 293 294 drv = driver_find("ivtv", &pci_bus_type); 295 ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback); 296 (void)ret; /* suppress compiler warning */ 297 298 ivtv_ext_init = NULL; 299 pr_info("ivtv-alsa: module unload complete\n"); 300 } 301 302 module_init(ivtv_alsa_init); 303 module_exit(ivtv_alsa_exit); 304