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->frequency < RSF16_MINFREQ || 172 f->frequency > RSF16_MAXFREQ) 173 return -EINVAL; 174 /* rounding in steps of 800 to match the freq 175 that will be used */ 176 fmi_setfreq(fmi, (f->frequency / 800) * 800); 177 return 0; 178 } 179 180 static int vidioc_g_frequency(struct file *file, void *priv, 181 struct v4l2_frequency *f) 182 { 183 struct fmi *fmi = video_drvdata(file); 184 185 f->type = V4L2_TUNER_RADIO; 186 f->frequency = fmi->curfreq; 187 return 0; 188 } 189 190 static int vidioc_queryctrl(struct file *file, void *priv, 191 struct v4l2_queryctrl *qc) 192 { 193 switch (qc->id) { 194 case V4L2_CID_AUDIO_MUTE: 195 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 196 } 197 return -EINVAL; 198 } 199 200 static int vidioc_g_ctrl(struct file *file, void *priv, 201 struct v4l2_control *ctrl) 202 { 203 struct fmi *fmi = video_drvdata(file); 204 205 switch (ctrl->id) { 206 case V4L2_CID_AUDIO_MUTE: 207 ctrl->value = fmi->curvol; 208 return 0; 209 } 210 return -EINVAL; 211 } 212 213 static int vidioc_s_ctrl(struct file *file, void *priv, 214 struct v4l2_control *ctrl) 215 { 216 struct fmi *fmi = video_drvdata(file); 217 218 switch (ctrl->id) { 219 case V4L2_CID_AUDIO_MUTE: 220 if (ctrl->value) 221 fmi_mute(fmi); 222 else 223 fmi_unmute(fmi); 224 fmi->curvol = ctrl->value; 225 return 0; 226 } 227 return -EINVAL; 228 } 229 230 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) 231 { 232 *i = 0; 233 return 0; 234 } 235 236 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) 237 { 238 return i ? -EINVAL : 0; 239 } 240 241 static int vidioc_g_audio(struct file *file, void *priv, 242 struct v4l2_audio *a) 243 { 244 a->index = 0; 245 strlcpy(a->name, "Radio", sizeof(a->name)); 246 a->capability = V4L2_AUDCAP_STEREO; 247 return 0; 248 } 249 250 static int vidioc_s_audio(struct file *file, void *priv, 251 struct v4l2_audio *a) 252 { 253 return a->index ? -EINVAL : 0; 254 } 255 256 static const struct v4l2_file_operations fmi_fops = { 257 .owner = THIS_MODULE, 258 .ioctl = video_ioctl2, 259 }; 260 261 static const struct v4l2_ioctl_ops fmi_ioctl_ops = { 262 .vidioc_querycap = vidioc_querycap, 263 .vidioc_g_tuner = vidioc_g_tuner, 264 .vidioc_s_tuner = vidioc_s_tuner, 265 .vidioc_g_audio = vidioc_g_audio, 266 .vidioc_s_audio = vidioc_s_audio, 267 .vidioc_g_input = vidioc_g_input, 268 .vidioc_s_input = vidioc_s_input, 269 .vidioc_g_frequency = vidioc_g_frequency, 270 .vidioc_s_frequency = vidioc_s_frequency, 271 .vidioc_queryctrl = vidioc_queryctrl, 272 .vidioc_g_ctrl = vidioc_g_ctrl, 273 .vidioc_s_ctrl = vidioc_s_ctrl, 274 }; 275 276 /* ladis: this is my card. does any other types exist? */ 277 static struct isapnp_device_id id_table[] __devinitdata = { 278 { ISAPNP_ANY_ID, ISAPNP_ANY_ID, 279 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0}, 280 { ISAPNP_CARD_END, }, 281 }; 282 283 MODULE_DEVICE_TABLE(isapnp, id_table); 284 285 static int __init isapnp_fmi_probe(void) 286 { 287 int i = 0; 288 289 while (id_table[i].card_vendor != 0 && dev == NULL) { 290 dev = pnp_find_dev(NULL, id_table[i].vendor, 291 id_table[i].function, NULL); 292 i++; 293 } 294 295 if (!dev) 296 return -ENODEV; 297 if (pnp_device_attach(dev) < 0) 298 return -EAGAIN; 299 if (pnp_activate_dev(dev) < 0) { 300 printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n"); 301 pnp_device_detach(dev); 302 return -ENOMEM; 303 } 304 if (!pnp_port_valid(dev, 0)) { 305 pnp_device_detach(dev); 306 return -ENODEV; 307 } 308 309 i = pnp_port_start(dev, 0); 310 printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i); 311 312 return i; 313 } 314 315 static int __init fmi_init(void) 316 { 317 struct fmi *fmi = &fmi_card; 318 struct v4l2_device *v4l2_dev = &fmi->v4l2_dev; 319 int res; 320 321 if (io < 0) 322 io = isapnp_fmi_probe(); 323 strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name)); 324 fmi->io = io; 325 if (fmi->io < 0) { 326 v4l2_err(v4l2_dev, "No PnP card found.\n"); 327 return fmi->io; 328 } 329 if (!request_region(io, 2, "radio-sf16fmi")) { 330 v4l2_err(v4l2_dev, "port 0x%x already in use\n", fmi->io); 331 pnp_device_detach(dev); 332 return -EBUSY; 333 } 334 335 res = v4l2_device_register(NULL, v4l2_dev); 336 if (res < 0) { 337 release_region(fmi->io, 2); 338 pnp_device_detach(dev); 339 v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); 340 return res; 341 } 342 343 strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name)); 344 fmi->vdev.v4l2_dev = v4l2_dev; 345 fmi->vdev.fops = &fmi_fops; 346 fmi->vdev.ioctl_ops = &fmi_ioctl_ops; 347 fmi->vdev.release = video_device_release_empty; 348 video_set_drvdata(&fmi->vdev, fmi); 349 350 mutex_init(&fmi->lock); 351 352 if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { 353 v4l2_device_unregister(v4l2_dev); 354 release_region(fmi->io, 2); 355 pnp_device_detach(dev); 356 return -EINVAL; 357 } 358 359 v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io); 360 /* mute card - prevents noisy bootups */ 361 fmi_mute(fmi); 362 return 0; 363 } 364 365 static void __exit fmi_exit(void) 366 { 367 struct fmi *fmi = &fmi_card; 368 369 video_unregister_device(&fmi->vdev); 370 v4l2_device_unregister(&fmi->v4l2_dev); 371 release_region(fmi->io, 2); 372 if (dev) 373 pnp_device_detach(dev); 374 } 375 376 module_init(fmi_init); 377 module_exit(fmi_exit); 378