1 /* SF16FMI radio driver for Linux radio support 2 * heavily based on rtrack driver... 3 * (c) 1997 M. Kirkwood 4 * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz 5 * 6 * Fitted to new interface by Alan Cox <alan@lxorguk.ukuu.org.uk> 7 * Made working and cleaned up functions <mikael.hedin@irf.se> 8 * Support for ISAPnP by Ladislav Michl <ladis@psi.cz> 9 * 10 * Notes on the hardware 11 * 12 * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); 13 * No volume control - only mute/unmute - you have to use line volume 14 * control on SB-part of SF16FMI 15 * 16 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> 17 */ 18 19 #include <linux/version.h> 20 #include <linux/kernel.h> /* __setup */ 21 #include <linux/module.h> /* Modules */ 22 #include <linux/init.h> /* Initdata */ 23 #include <linux/ioport.h> /* request_region */ 24 #include <linux/delay.h> /* udelay */ 25 #include <linux/isapnp.h> 26 #include <linux/mutex.h> 27 #include <linux/videodev2.h> /* kernel radio structs */ 28 #include <linux/io.h> /* outb, outb_p */ 29 #include <media/v4l2-device.h> 30 #include <media/v4l2-ioctl.h> 31 32 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood"); 33 MODULE_DESCRIPTION("A driver for the SF16MI radio."); 34 MODULE_LICENSE("GPL"); 35 36 static int io = -1; 37 static int radio_nr = -1; 38 39 module_param(io, int, 0); 40 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)"); 41 module_param(radio_nr, int, 0); 42 43 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2) 44 45 struct fmi 46 { 47 struct v4l2_device v4l2_dev; 48 struct video_device vdev; 49 int io; 50 int curvol; /* 1 or 0 */ 51 unsigned long curfreq; /* freq in kHz */ 52 struct mutex lock; 53 }; 54 55 static struct fmi fmi_card; 56 static struct pnp_dev *dev; 57 58 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */ 59 /* It is only useful to give freq in interval of 800 (=0.05Mhz), 60 * other bits will be truncated, e.g 92.7400016 -> 92.7, but 61 * 92.7400017 -> 92.75 62 */ 63 #define RSF16_ENCODE(x) ((x) / 800 + 214) 64 #define RSF16_MINFREQ (87 * 16000) 65 #define RSF16_MAXFREQ (108 * 16000) 66 67 static void outbits(int bits, unsigned int data, int io) 68 { 69 while (bits--) { 70 if (data & 1) { 71 outb(5, io); 72 udelay(6); 73 outb(7, io); 74 udelay(6); 75 } else { 76 outb(1, io); 77 udelay(6); 78 outb(3, io); 79 udelay(6); 80 } 81 data >>= 1; 82 } 83 } 84 85 static inline void fmi_mute(struct fmi *fmi) 86 { 87 mutex_lock(&fmi->lock); 88 outb(0x00, fmi->io); 89 mutex_unlock(&fmi->lock); 90 } 91 92 static inline void fmi_unmute(struct fmi *fmi) 93 { 94 mutex_lock(&fmi->lock); 95 outb(0x08, fmi->io); 96 mutex_unlock(&fmi->lock); 97 } 98 99 static inline int fmi_setfreq(struct fmi *fmi, unsigned long freq) 100 { 101 mutex_lock(&fmi->lock); 102 fmi->curfreq = freq; 103 104 outbits(16, RSF16_ENCODE(freq), fmi->io); 105 outbits(8, 0xC0, fmi->io); 106 msleep(143); /* was schedule_timeout(HZ/7) */ 107 mutex_unlock(&fmi->lock); 108 if (fmi->curvol) 109 fmi_unmute(fmi); 110 return 0; 111 } 112 113 static inline int fmi_getsigstr(struct fmi *fmi) 114 { 115 int val; 116 int res; 117 118 mutex_lock(&fmi->lock); 119 val = fmi->curvol ? 0x08 : 0x00; /* unmute/mute */ 120 outb(val, fmi->io); 121 outb(val | 0x10, fmi->io); 122 msleep(143); /* was schedule_timeout(HZ/7) */ 123 res = (int)inb(fmi->io + 1); 124 outb(val, fmi->io); 125 126 mutex_unlock(&fmi->lock); 127 return (res & 2) ? 0 : 0xFFFF; 128 } 129 130 static int vidioc_querycap(struct file *file, void *priv, 131 struct v4l2_capability *v) 132 { 133 strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver)); 134 strlcpy(v->card, "SF16-FMx radio", sizeof(v->card)); 135 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info)); 136 v->version = RADIO_VERSION; 137 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO; 138 return 0; 139 } 140 141 static int vidioc_g_tuner(struct file *file, void *priv, 142 struct v4l2_tuner *v) 143 { 144 struct fmi *fmi = video_drvdata(file); 145 146 if (v->index > 0) 147 return -EINVAL; 148 149 strlcpy(v->name, "FM", sizeof(v->name)); 150 v->type = V4L2_TUNER_RADIO; 151 v->rangelow = RSF16_MINFREQ; 152 v->rangehigh = RSF16_MAXFREQ; 153 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO; 154 v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW; 155 v->audmode = V4L2_TUNER_MODE_STEREO; 156 v->signal = fmi_getsigstr(fmi); 157 return 0; 158 } 159 160 static int vidioc_s_tuner(struct file *file, void *priv, 161 struct v4l2_tuner *v) 162 { 163 return v->index ? -EINVAL : 0; 164 } 165 166 static int vidioc_s_frequency(struct file *file, void *priv, 167 struct v4l2_frequency *f) 168 { 169 struct fmi *fmi = video_drvdata(file); 170 171 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) 172 return -EINVAL; 173 if (f->frequency < RSF16_MINFREQ || 174 f->frequency > RSF16_MAXFREQ) 175 return -EINVAL; 176 /* rounding in steps of 800 to match the freq 177 that will be used */ 178 fmi_setfreq(fmi, (f->frequency / 800) * 800); 179 return 0; 180 } 181 182 static int vidioc_g_frequency(struct file *file, void *priv, 183 struct v4l2_frequency *f) 184 { 185 struct fmi *fmi = video_drvdata(file); 186 187 if (f->tuner != 0) 188 return -EINVAL; 189 f->type = V4L2_TUNER_RADIO; 190 f->frequency = fmi->curfreq; 191 return 0; 192 } 193 194 static int vidioc_queryctrl(struct file *file, void *priv, 195 struct v4l2_queryctrl *qc) 196 { 197 switch (qc->id) { 198 case V4L2_CID_AUDIO_MUTE: 199 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 200 } 201 return -EINVAL; 202 } 203 204 static int vidioc_g_ctrl(struct file *file, void *priv, 205 struct v4l2_control *ctrl) 206 { 207 struct fmi *fmi = video_drvdata(file); 208 209 switch (ctrl->id) { 210 case V4L2_CID_AUDIO_MUTE: 211 ctrl->value = fmi->curvol; 212 return 0; 213 } 214 return -EINVAL; 215 } 216 217 static int vidioc_s_ctrl(struct file *file, void *priv, 218 struct v4l2_control *ctrl) 219 { 220 struct fmi *fmi = video_drvdata(file); 221 222 switch (ctrl->id) { 223 case V4L2_CID_AUDIO_MUTE: 224 if (ctrl->value) 225 fmi_mute(fmi); 226 else 227 fmi_unmute(fmi); 228 fmi->curvol = ctrl->value; 229 return 0; 230 } 231 return -EINVAL; 232 } 233 234 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 235 { 236 *i = 0; 237 return 0; 238 } 239 240 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 241 { 242 return i ? -EINVAL : 0; 243 } 244 245 static int vidioc_g_audio(struct file *file, void *priv, 246 struct v4l2_audio *a) 247 { 248 a->index = 0; 249 strlcpy(a->name, "Radio", sizeof(a->name)); 250 a->capability = V4L2_AUDCAP_STEREO; 251 return 0; 252 } 253 254 static int vidioc_s_audio(struct file *file, void *priv, 255 struct v4l2_audio *a) 256 { 257 return a->index ? -EINVAL : 0; 258 } 259 260 static const struct v4l2_file_operations fmi_fops = { 261 .owner = THIS_MODULE, 262 .ioctl = video_ioctl2, 263 }; 264 265 static const struct v4l2_ioctl_ops fmi_ioctl_ops = { 266 .vidioc_querycap = vidioc_querycap, 267 .vidioc_g_tuner = vidioc_g_tuner, 268 .vidioc_s_tuner = vidioc_s_tuner, 269 .vidioc_g_audio = vidioc_g_audio, 270 .vidioc_s_audio = vidioc_s_audio, 271 .vidioc_g_input = vidioc_g_input, 272 .vidioc_s_input = vidioc_s_input, 273 .vidioc_g_frequency = vidioc_g_frequency, 274 .vidioc_s_frequency = vidioc_s_frequency, 275 .vidioc_queryctrl = vidioc_queryctrl, 276 .vidioc_g_ctrl = vidioc_g_ctrl, 277 .vidioc_s_ctrl = vidioc_s_ctrl, 278 }; 279 280 /* ladis: this is my card. does any other types exist? */ 281 static struct isapnp_device_id id_table[] __devinitdata = { 282 { ISAPNP_ANY_ID, ISAPNP_ANY_ID, 283 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0}, 284 { ISAPNP_CARD_END, }, 285 }; 286 287 MODULE_DEVICE_TABLE(isapnp, id_table); 288 289 static int __init isapnp_fmi_probe(void) 290 { 291 int i = 0; 292 293 while (id_table[i].card_vendor != 0 && dev == NULL) { 294 dev = pnp_find_dev(NULL, id_table[i].vendor, 295 id_table[i].function, NULL); 296 i++; 297 } 298 299 if (!dev) 300 return -ENODEV; 301 if (pnp_device_attach(dev) < 0) 302 return -EAGAIN; 303 if (pnp_activate_dev(dev) < 0) { 304 printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n"); 305 pnp_device_detach(dev); 306 return -ENOMEM; 307 } 308 if (!pnp_port_valid(dev, 0)) { 309 pnp_device_detach(dev); 310 return -ENODEV; 311 } 312 313 i = pnp_port_start(dev, 0); 314 printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i); 315 316 return i; 317 } 318 319 static int __init fmi_init(void) 320 { 321 struct fmi *fmi = &fmi_card; 322 struct v4l2_device *v4l2_dev = &fmi->v4l2_dev; 323 int res; 324 325 if (io < 0) 326 io = isapnp_fmi_probe(); 327 strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name)); 328 fmi->io = io; 329 if (fmi->io < 0) { 330 v4l2_err(v4l2_dev, "No PnP card found.\n"); 331 return fmi->io; 332 } 333 if (!request_region(io, 2, "radio-sf16fmi")) { 334 v4l2_err(v4l2_dev, "port 0x%x already in use\n", fmi->io); 335 pnp_device_detach(dev); 336 return -EBUSY; 337 } 338 339 res = v4l2_device_register(NULL, v4l2_dev); 340 if (res < 0) { 341 release_region(fmi->io, 2); 342 pnp_device_detach(dev); 343 v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); 344 return res; 345 } 346 347 strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name)); 348 fmi->vdev.v4l2_dev = v4l2_dev; 349 fmi->vdev.fops = &fmi_fops; 350 fmi->vdev.ioctl_ops = &fmi_ioctl_ops; 351 fmi->vdev.release = video_device_release_empty; 352 video_set_drvdata(&fmi->vdev, fmi); 353 354 mutex_init(&fmi->lock); 355 356 if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { 357 v4l2_device_unregister(v4l2_dev); 358 release_region(fmi->io, 2); 359 pnp_device_detach(dev); 360 return -EINVAL; 361 } 362 363 v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io); 364 /* mute card - prevents noisy bootups */ 365 fmi_mute(fmi); 366 return 0; 367 } 368 369 static void __exit fmi_exit(void) 370 { 371 struct fmi *fmi = &fmi_card; 372 373 video_unregister_device(&fmi->vdev); 374 v4l2_device_unregister(&fmi->v4l2_dev); 375 release_region(fmi->io, 2); 376 if (dev) 377 pnp_device_detach(dev); 378 } 379 380 module_init(fmi_init); 381 module_exit(fmi_exit); 382