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