drivers/media/radio/radio-isa.c

   1 /*
   2  * Framework for ISA radio drivers.
   3  * This takes care of all the V4L2 scaffolding, allowing the ISA drivers
   4  * to concentrate on the actual hardware operation.
   5  *
   6  * Copyright (C) 2012 Hans Verkuil <hans.verkuil@cisco.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/ioport.h>
  26 #include <linux/delay.h>
  27 #include <linux/videodev2.h>
  28 #include <linux/io.h>
  29 #include <linux/slab.h>
  30 #include <media/v4l2-device.h>
  31 #include <media/v4l2-ioctl.h>
  32 #include <media/v4l2-fh.h>
  33 #include <media/v4l2-ctrls.h>
  34 #include <media/v4l2-event.h>
  35
  36 #include "radio-isa.h"
  37
  38 MODULE_AUTHOR("Hans Verkuil");
  39 MODULE_DESCRIPTION("A framework for ISA radio drivers.");
  40 MODULE_LICENSE("GPL");
  41
  42 #define FREQ_LOW  (87U * 16000U)
  43 #define FREQ_HIGH (108U * 16000U)
  44
  45 static int radio_isa_querycap(struct file *file, void  *priv,
  46                                         struct v4l2_capability *v)
  47 {
  48         struct radio_isa_card *isa = video_drvdata(file);
  49
  50         strlcpy(v->driver, isa->drv->driver.driver.name, sizeof(v->driver));
  51         strlcpy(v->card, isa->drv->card, sizeof(v->card));
  52         snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", isa->v4l2_dev.name);
  53
  54         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
  55         v->device_caps = v->capabilities | V4L2_CAP_DEVICE_CAPS;
  56         return 0;
  57 }
  58
  59 static int radio_isa_g_tuner(struct file *file, void *priv,
  60                                 struct v4l2_tuner *v)
  61 {
  62         struct radio_isa_card *isa = video_drvdata(file);
  63         const struct radio_isa_ops *ops = isa->drv->ops;
  64
  65         if (v->index > 0)
  66                 return -EINVAL;
  67
  68         strlcpy(v->name, "FM", sizeof(v->name));
  69         v->type = V4L2_TUNER_RADIO;
  70         v->rangelow = FREQ_LOW;
  71         v->rangehigh = FREQ_HIGH;
  72         v->capability = V4L2_TUNER_CAP_LOW;
  73         if (isa->drv->has_stereo)
  74                 v->capability |= V4L2_TUNER_CAP_STEREO;
  75
  76         if (ops->g_rxsubchans)
  77                 v->rxsubchans = ops->g_rxsubchans(isa);
  78         else
  79                 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
  80         v->audmode = isa->stereo ? V4L2_TUNER_MODE_STEREO : V4L2_TUNER_MODE_MONO;
  81         if (ops->g_signal)
  82                 v->signal = ops->g_signal(isa);
  83         else
  84                 v->signal = (v->rxsubchans & V4L2_TUNER_SUB_STEREO) ?
  85                                                                 0xffff : 0;
  86         return 0;
  87 }
  88
  89 static int radio_isa_s_tuner(struct file *file, void *priv,
  90                                 struct v4l2_tuner *v)
  91 {
  92         struct radio_isa_card *isa = video_drvdata(file);
  93         const struct radio_isa_ops *ops = isa->drv->ops;
  94
  95         if (v->index)
  96                 return -EINVAL;
  97         if (ops->s_stereo) {
  98                 isa->stereo = (v->audmode == V4L2_TUNER_MODE_STEREO);
  99                 return ops->s_stereo(isa, isa->stereo);
 100         }
 101         return 0;
 102 }
 103
 104 static int radio_isa_s_frequency(struct file *file, void *priv,
 105                                 struct v4l2_frequency *f)
 106 {
 107         struct radio_isa_card *isa = video_drvdata(file);
 108         int res;
 109
 110         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 111                 return -EINVAL;
 112         f->frequency = clamp(f->frequency, FREQ_LOW, FREQ_HIGH);
 113         res = isa->drv->ops->s_frequency(isa, f->frequency);
 114         if (res == 0)
 115                 isa->freq = f->frequency;
 116         return res;
 117 }
 118
 119 static int radio_isa_g_frequency(struct file *file, void *priv,
 120                                 struct v4l2_frequency *f)
 121 {
 122         struct radio_isa_card *isa = video_drvdata(file);
 123
 124         if (f->tuner != 0)
 125                 return -EINVAL;
 126         f->type = V4L2_TUNER_RADIO;
 127         f->frequency = isa->freq;
 128         return 0;
 129 }
 130
 131 static int radio_isa_s_ctrl(struct v4l2_ctrl *ctrl)
 132 {
 133         struct radio_isa_card *isa =
 134                 container_of(ctrl->handler, struct radio_isa_card, hdl);
 135
 136         switch (ctrl->id) {
 137         case V4L2_CID_AUDIO_MUTE:
 138                 return isa->drv->ops->s_mute_volume(isa, ctrl->val,
 139                                 isa->volume ? isa->volume->val : 0);
 140         }
 141         return -EINVAL;
 142 }
 143
 144 static int radio_isa_log_status(struct file *file, void *priv)
 145 {
 146         struct radio_isa_card *isa = video_drvdata(file);
 147
 148         v4l2_info(&isa->v4l2_dev, "I/O Port = 0x%03x\n", isa->io);
 149         v4l2_ctrl_handler_log_status(&isa->hdl, isa->v4l2_dev.name);
 150         return 0;
 151 }
 152
 153 static int radio_isa_subscribe_event(struct v4l2_fh *fh,
 154                                 struct v4l2_event_subscription *sub)
 155 {
 156         if (sub->type == V4L2_EVENT_CTRL)
 157                 return v4l2_event_subscribe(fh, sub, 0);
 158         return -EINVAL;
 159 }
 160
 161 static const struct v4l2_ctrl_ops radio_isa_ctrl_ops = {
 162         .s_ctrl = radio_isa_s_ctrl,
 163 };
 164
 165 static const struct v4l2_file_operations radio_isa_fops = {
 166         .owner          = THIS_MODULE,
 167         .open           = v4l2_fh_open,
 168         .release        = v4l2_fh_release,
 169         .poll           = v4l2_ctrl_poll,
 170         .unlocked_ioctl = video_ioctl2,
 171 };
 172
 173 static const struct v4l2_ioctl_ops radio_isa_ioctl_ops = {
 174         .vidioc_querycap    = radio_isa_querycap,
 175         .vidioc_g_tuner     = radio_isa_g_tuner,
 176         .vidioc_s_tuner     = radio_isa_s_tuner,
 177         .vidioc_g_frequency = radio_isa_g_frequency,
 178         .vidioc_s_frequency = radio_isa_s_frequency,
 179         .vidioc_log_status  = radio_isa_log_status,
 180         .vidioc_subscribe_event   = radio_isa_subscribe_event,
 181         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 182 };
 183
 184 int radio_isa_match(struct device *pdev, unsigned int dev)
 185 {
 186         struct radio_isa_driver *drv = pdev->platform_data;
 187
 188         return drv->probe || drv->io_params[dev] >= 0;
 189 }
 190 EXPORT_SYMBOL_GPL(radio_isa_match);
 191
 192 static bool radio_isa_valid_io(const struct radio_isa_driver *drv, int io)
 193 {
 194         int i;
 195
 196         for (i = 0; i < drv->num_of_io_ports; i++)
 197                 if (drv->io_ports[i] == io)
 198                         return true;
 199         return false;
 200 }
 201
 202 int radio_isa_probe(struct device *pdev, unsigned int dev)
 203 {
 204         struct radio_isa_driver *drv = pdev->platform_data;
 205         const struct radio_isa_ops *ops = drv->ops;
 206         struct v4l2_device *v4l2_dev;
 207         struct radio_isa_card *isa;
 208         int res;
 209
 210         isa = drv->ops->alloc();
 211         if (isa == NULL)
 212                 return -ENOMEM;
 213         dev_set_drvdata(pdev, isa);
 214         isa->drv = drv;
 215         isa->io = drv->io_params[dev];
 216         v4l2_dev = &isa->v4l2_dev;
 217         strlcpy(v4l2_dev->name, dev_name(pdev), sizeof(v4l2_dev->name));
 218
 219         if (drv->probe && ops->probe) {
 220                 int i;
 221
 222                 for (i = 0; i < drv->num_of_io_ports; ++i) {
 223                         int io = drv->io_ports[i];
 224
 225                         if (request_region(io, drv->region_size, v4l2_dev->name)) {
 226                                 bool found = ops->probe(isa, io);
 227
 228                                 release_region(io, drv->region_size);
 229                                 if (found) {
 230                                         isa->io = io;
 231                                         break;
 232                                 }
 233                         }
 234                 }
 235         }
 236
 237         if (!radio_isa_valid_io(drv, isa->io)) {
 238                 int i;
 239
 240                 if (isa->io < 0)
 241                         return -ENODEV;
 242                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x%03x",
 243                                 drv->io_ports[0]);
 244                 for (i = 1; i < drv->num_of_io_ports; i++)
 245                         printk(KERN_CONT "/0x%03x", drv->io_ports[i]);
 246                 printk(KERN_CONT ".\n");
 247                 kfree(isa);
 248                 return -EINVAL;
 249         }
 250
 251         if (!request_region(isa->io, drv->region_size, v4l2_dev->name)) {
 252                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", isa->io);
 253                 kfree(isa);
 254                 return -EBUSY;
 255         }
 256
 257         res = v4l2_device_register(pdev, v4l2_dev);
 258         if (res < 0) {
 259                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 260                 goto err_dev_reg;
 261         }
 262
 263         v4l2_ctrl_handler_init(&isa->hdl, 1);
 264         isa->mute = v4l2_ctrl_new_std(&isa->hdl, &radio_isa_ctrl_ops,
 265                                 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 266         if (drv->max_volume)
 267                 isa->volume = v4l2_ctrl_new_std(&isa->hdl, &radio_isa_ctrl_ops,
 268                         V4L2_CID_AUDIO_VOLUME, 0, drv->max_volume, 1,
 269                         drv->max_volume);
 270         v4l2_dev->ctrl_handler = &isa->hdl;
 271         if (isa->hdl.error) {
 272                 res = isa->hdl.error;
 273                 v4l2_err(v4l2_dev, "Could not register controls\n");
 274                 goto err_hdl;
 275         }
 276         if (drv->max_volume)
 277                 v4l2_ctrl_cluster(2, &isa->mute);
 278         v4l2_dev->ctrl_handler = &isa->hdl;
 279
 280         mutex_init(&isa->lock);
 281         isa->vdev.lock = &isa->lock;
 282         strlcpy(isa->vdev.name, v4l2_dev->name, sizeof(isa->vdev.name));
 283         isa->vdev.v4l2_dev = v4l2_dev;
 284         isa->vdev.fops = &radio_isa_fops;
 285         isa->vdev.ioctl_ops = &radio_isa_ioctl_ops;
 286         isa->vdev.release = video_device_release_empty;
 287         set_bit(V4L2_FL_USE_FH_PRIO, &isa->vdev.flags);
 288         video_set_drvdata(&isa->vdev, isa);
 289         isa->freq = FREQ_LOW;
 290         isa->stereo = drv->has_stereo;
 291
 292         if (ops->init)
 293                 res = ops->init(isa);
 294         if (!res)
 295                 res = v4l2_ctrl_handler_setup(&isa->hdl);
 296         if (!res)
 297                 res = ops->s_frequency(isa, isa->freq);
 298         if (!res && ops->s_stereo)
 299                 res = ops->s_stereo(isa, isa->stereo);
 300         if (res < 0) {
 301                 v4l2_err(v4l2_dev, "Could not setup card\n");
 302                 goto err_node_reg;
 303         }
 304         res = video_register_device(&isa->vdev, VFL_TYPE_RADIO,
 305                                         drv->radio_nr_params[dev]);
 306         if (res < 0) {
 307                 v4l2_err(v4l2_dev, "Could not register device node\n");
 308                 goto err_node_reg;
 309         }
 310
 311         v4l2_info(v4l2_dev, "Initialized radio card %s on port 0x%03x\n",
 312                         drv->card, isa->io);
 313         return 0;
 314
 315 err_node_reg:
 316         v4l2_ctrl_handler_free(&isa->hdl);
 317 err_hdl:
 318         v4l2_device_unregister(&isa->v4l2_dev);
 319 err_dev_reg:
 320         release_region(isa->io, drv->region_size);
 321         kfree(isa);
 322         return res;
 323 }
 324 EXPORT_SYMBOL_GPL(radio_isa_probe);
 325
 326 int radio_isa_remove(struct device *pdev, unsigned int dev)
 327 {
 328         struct radio_isa_card *isa = dev_get_drvdata(pdev);
 329         const struct radio_isa_ops *ops = isa->drv->ops;
 330
 331         ops->s_mute_volume(isa, true, isa->volume ? isa->volume->cur.val : 0);
 332         video_unregister_device(&isa->vdev);
 333         v4l2_ctrl_handler_free(&isa->hdl);
 334         v4l2_device_unregister(&isa->v4l2_dev);
 335         release_region(isa->io, isa->drv->region_size);
 336         v4l2_info(&isa->v4l2_dev, "Removed radio card %s\n", isa->drv->card);
 337         kfree(isa);
 338         return 0;
 339 }
 340 EXPORT_SYMBOL_GPL(radio_isa_remove);