1/* 2 * ALSA interface to cx18 PCM capture streams 3 * 4 * Copyright (C) 2009 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. 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 "cx18-driver.h" 38#include "cx18-version.h" 39#include "cx18-alsa.h" 40#include "cx18-alsa-mixer.h" 41#include "cx18-alsa-pcm.h" 42 43int cx18_alsa_debug; 44 45#define CX18_DEBUG_ALSA_INFO(fmt, arg...) \ 46 do { \ 47 if (cx18_alsa_debug & 2) \ 48 printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \ 49 } while (0); 50 51module_param_named(debug, cx18_alsa_debug, int, 0644); 52MODULE_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 57MODULE_AUTHOR("Andy Walls"); 58MODULE_DESCRIPTION("CX23418 ALSA Interface"); 59MODULE_SUPPORTED_DEVICE("CX23418 MPEG2 encoder"); 60MODULE_LICENSE("GPL"); 61 62MODULE_VERSION(CX18_VERSION); 63 64static inline 65struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev) 66{ 67 return to_cx18(v4l2_dev)->alsa; 68} 69 70static inline 71struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev) 72{ 73 return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev); 74} 75 76static void snd_cx18_card_free(struct snd_cx18_card *cxsc) 77{ 78 if (cxsc == NULL) 79 return; 80 81 if (cxsc->v4l2_dev != NULL) 82 to_cx18(cxsc->v4l2_dev)->alsa = NULL; 83 84 85 kfree(cxsc); 86} 87 88static void snd_cx18_card_private_free(struct snd_card *sc) 89{ 90 if (sc == NULL) 91 return; 92 snd_cx18_card_free(sc->private_data); 93 sc->private_data = NULL; 94 sc->private_free = NULL; 95} 96 97static int snd_cx18_card_create(struct v4l2_device *v4l2_dev, 98 struct snd_card *sc, 99 struct snd_cx18_card **cxsc) 100{ 101 *cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL); 102 if (*cxsc == NULL) 103 return -ENOMEM; 104 105 (*cxsc)->v4l2_dev = v4l2_dev; 106 (*cxsc)->sc = sc; 107 108 sc->private_data = *cxsc; 109 sc->private_free = snd_cx18_card_private_free; 110 111 return 0; 112} 113 114static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc) 115{ 116 struct cx18 *cx = to_cx18(cxsc->v4l2_dev); 117 struct snd_card *sc = cxsc->sc; 118 119 /* sc->driver is used by alsa-lib's configurator: simple, unique */ 120 strlcpy(sc->driver, "CX23418", sizeof(sc->driver)); 121 122 /* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */ 123 snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d", 124 cx->instance); 125 126 /* sc->longname is read from /proc/asound/cards */ 127 snprintf(sc->longname, sizeof(sc->longname), 128 "CX23418 #%d %s TV/FM Radio/Line-In Capture", 129 cx->instance, cx->card_name); 130 131 return 0; 132} 133 134static int snd_cx18_init(struct v4l2_device *v4l2_dev) 135{ 136 struct cx18 *cx = to_cx18(v4l2_dev); 137 struct snd_card *sc = NULL; 138 struct snd_cx18_card *cxsc; 139 int ret; 140 141 /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */ 142 143 /* (1) Check and increment the device index */ 144 /* This is a no-op for us. We'll use the cx->instance */ 145 146 /* (2) Create a card instance */ 147 ret = snd_card_create(SNDRV_DEFAULT_IDX1, /* use first available id */ 148 SNDRV_DEFAULT_STR1, /* xid from end of shortname*/ 149 THIS_MODULE, 0, &sc); 150 if (ret) { 151 CX18_ALSA_ERR("%s: snd_card_create() failed with err %d\n", 152 __func__, ret); 153 goto err_exit; 154 } 155 156 /* (3) Create a main component */ 157 ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc); 158 if (ret) { 159 CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n", 160 __func__, ret); 161 goto err_exit_free; 162 } 163 164 /* (4) Set the driver ID and name strings */ 165 snd_cx18_card_set_names(cxsc); 166 167 168 ret = snd_cx18_pcm_create(cxsc); 169 if (ret) { 170 CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n", 171 __func__, ret); 172 goto err_exit_free; 173 } 174 175 /* (7) Set the driver data and return 0 */ 176 /* We do this out of normal order for PCI drivers to avoid races */ 177 cx->alsa = cxsc; 178 179 /* (6) Register the card instance */ 180 ret = snd_card_register(sc); 181 if (ret) { 182 cx->alsa = NULL; 183 CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n", 184 __func__, ret); 185 goto err_exit_free; 186 } 187 188 return 0; 189 190err_exit_free: 191 if (sc != NULL) 192 snd_card_free(sc); 193err_exit: 194 return ret; 195} 196 197int cx18_alsa_load(struct cx18 *cx) 198{ 199 struct v4l2_device *v4l2_dev = &cx->v4l2_dev; 200 struct cx18_stream *s; 201 202 if (v4l2_dev == NULL) { 203 printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", 204 __func__); 205 return 0; 206 } 207 208 cx = to_cx18(v4l2_dev); 209 if (cx == NULL) { 210 printk(KERN_ERR "cx18-alsa cx is NULL\n"); 211 return 0; 212 } 213 214 s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; 215 if (s->video_dev == NULL) { 216 CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - " 217 "skipping\n", __func__); 218 return 0; 219 } 220 221 if (cx->alsa != NULL) { 222 CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n", 223 __func__); 224 return 0; 225 } 226 227 if (snd_cx18_init(v4l2_dev)) { 228 CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n", 229 __func__); 230 } else { 231 CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance " 232 "\n", __func__); 233 } 234 return 0; 235} 236 237static int __init cx18_alsa_init(void) 238{ 239 printk(KERN_INFO "cx18-alsa: module loading...\n"); 240 cx18_ext_init = &cx18_alsa_load; 241 return 0; 242} 243 244static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc) 245{ 246 struct cx18 *cx = to_cx18(cxsc->v4l2_dev); 247 248 249 snd_card_free(cxsc->sc); 250 cx->alsa = NULL; 251} 252 253static int __exit cx18_alsa_exit_callback(struct device *dev, void *data) 254{ 255 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); 256 struct snd_cx18_card *cxsc; 257 258 if (v4l2_dev == NULL) { 259 printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", 260 __func__); 261 return 0; 262 } 263 264 cxsc = to_snd_cx18_card(v4l2_dev); 265 if (cxsc == NULL) { 266 CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n", 267 __func__); 268 return 0; 269 } 270 271 snd_cx18_exit(cxsc); 272 return 0; 273} 274 275static void __exit cx18_alsa_exit(void) 276{ 277 struct device_driver *drv; 278 int ret; 279 280 printk(KERN_INFO "cx18-alsa: module unloading...\n"); 281 282 drv = driver_find("cx18", &pci_bus_type); 283 ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback); 284 put_driver(drv); 285 286 cx18_ext_init = NULL; 287 printk(KERN_INFO "cx18-alsa: module unload complete\n"); 288} 289 290module_init(cx18_alsa_init); 291module_exit(cx18_alsa_exit); 292