drivers/media/usb/dvb-usb/dvb-usb-init.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * DVB USB library - provides a generic interface for a DVB USB device driver.
   4  *
   5  * dvb-usb-init.c
   6  *
   7  * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
   8  *
   9  * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
  10  */
  11 #include "dvb-usb-common.h"
  12
  13 /* debug */
  14 int dvb_usb_debug;
  15 module_param_named(debug, dvb_usb_debug, int, 0644);
  16 MODULE_PARM_DESC(debug, "set debugging level (1=info,xfer=2,pll=4,ts=8,err=16,rc=32,fw=64,mem=128,uxfer=256  (or-able))." DVB_USB_DEBUG_STATUS);
  17
  18 int dvb_usb_disable_rc_polling;
  19 module_param_named(disable_rc_polling, dvb_usb_disable_rc_polling, int, 0644);
  20 MODULE_PARM_DESC(disable_rc_polling, "disable remote control polling (default: 0).");
  21
  22 static int dvb_usb_force_pid_filter_usage;
  23 module_param_named(force_pid_filter_usage, dvb_usb_force_pid_filter_usage, int, 0444);
  24 MODULE_PARM_DESC(force_pid_filter_usage, "force all dvb-usb-devices to use a PID filter, if any (default: 0).");
  25
  26 static int dvb_usb_adapter_init(struct dvb_usb_device *d, short *adapter_nrs)
  27 {
  28         struct dvb_usb_adapter *adap;
  29         int ret, n, o;
  30
  31         for (n = 0; n < d->props.num_adapters; n++) {
  32                 adap = &d->adapter[n];
  33                 adap->dev = d;
  34                 adap->id  = n;
  35
  36                 memcpy(&adap->props, &d->props.adapter[n], sizeof(struct dvb_usb_adapter_properties));
  37
  38                 for (o = 0; o < adap->props.num_frontends; o++) {
  39                         struct dvb_usb_adapter_fe_properties *props = &adap->props.fe[o];
  40                         /* speed - when running at FULL speed we need a HW PID filter */
  41                         if (d->udev->speed == USB_SPEED_FULL && !(props->caps & DVB_USB_ADAP_HAS_PID_FILTER)) {
  42                                 err("This USB2.0 device cannot be run on a USB1.1 port. (it lacks a hardware PID filter)");
  43                                 return -ENODEV;
  44                         }
  45
  46                         if ((d->udev->speed == USB_SPEED_FULL && props->caps & DVB_USB_ADAP_HAS_PID_FILTER) ||
  47                                 (props->caps & DVB_USB_ADAP_NEED_PID_FILTERING)) {
  48                                 info("will use the device's hardware PID filter (table count: %d).", props->pid_filter_count);
  49                                 adap->fe_adap[o].pid_filtering  = 1;
  50                                 adap->fe_adap[o].max_feed_count = props->pid_filter_count;
  51                         } else {
  52                                 info("will pass the complete MPEG2 transport stream to the software demuxer.");
  53                                 adap->fe_adap[o].pid_filtering  = 0;
  54                                 adap->fe_adap[o].max_feed_count = 255;
  55                         }
  56
  57                         if (!adap->fe_adap[o].pid_filtering &&
  58                                 dvb_usb_force_pid_filter_usage &&
  59                                 props->caps & DVB_USB_ADAP_HAS_PID_FILTER) {
  60                                 info("pid filter enabled by module option.");
  61                                 adap->fe_adap[o].pid_filtering  = 1;
  62                                 adap->fe_adap[o].max_feed_count = props->pid_filter_count;
  63                         }
  64
  65                         if (props->size_of_priv > 0) {
  66                                 adap->fe_adap[o].priv = kzalloc(props->size_of_priv, GFP_KERNEL);
  67                                 if (adap->fe_adap[o].priv == NULL) {
  68                                         err("no memory for priv for adapter %d fe %d.", n, o);
  69                                         return -ENOMEM;
  70                                 }
  71                         }
  72                 }
  73
  74                 if (adap->props.size_of_priv > 0) {
  75                         adap->priv = kzalloc(adap->props.size_of_priv, GFP_KERNEL);
  76                         if (adap->priv == NULL) {
  77                                 err("no memory for priv for adapter %d.", n);
  78                                 return -ENOMEM;
  79                         }
  80                 }
  81
  82                 ret = dvb_usb_adapter_stream_init(adap);
  83                 if (ret)
  84                         goto stream_init_err;
  85
  86                 ret = dvb_usb_adapter_dvb_init(adap, adapter_nrs);
  87                 if (ret)
  88                         goto dvb_init_err;
  89
  90                 ret = dvb_usb_adapter_frontend_init(adap);
  91                 if (ret)
  92                         goto frontend_init_err;
  93
  94                 /* use exclusive FE lock if there is multiple shared FEs */
  95                 if (adap->fe_adap[1].fe && adap->dvb_adap.mfe_shared < 1)
  96                         adap->dvb_adap.mfe_shared = 1;
  97
  98                 d->num_adapters_initialized++;
  99                 d->state |= DVB_USB_STATE_DVB;
 100         }
 101
 102         /*
 103          * when reloading the driver w/o replugging the device
 104          * sometimes a timeout occurs, this helps
 105          */
 106         if (d->props.generic_bulk_ctrl_endpoint != 0) {
 107                 usb_clear_halt(d->udev, usb_sndbulkpipe(d->udev, d->props.generic_bulk_ctrl_endpoint));
 108                 usb_clear_halt(d->udev, usb_rcvbulkpipe(d->udev, d->props.generic_bulk_ctrl_endpoint));
 109         }
 110
 111         return 0;
 112
 113 frontend_init_err:
 114         dvb_usb_adapter_dvb_exit(adap);
 115 dvb_init_err:
 116         dvb_usb_adapter_stream_exit(adap);
 117 stream_init_err:
 118         kfree(adap->priv);
 119         return ret;
 120 }
 121
 122 static int dvb_usb_adapter_exit(struct dvb_usb_device *d)
 123 {
 124         int n;
 125
 126         for (n = 0; n < d->num_adapters_initialized; n++) {
 127                 dvb_usb_adapter_frontend_exit(&d->adapter[n]);
 128                 dvb_usb_adapter_dvb_exit(&d->adapter[n]);
 129                 dvb_usb_adapter_stream_exit(&d->adapter[n]);
 130                 kfree(d->adapter[n].priv);
 131         }
 132         d->num_adapters_initialized = 0;
 133         d->state &= ~DVB_USB_STATE_DVB;
 134         return 0;
 135 }
 136
 137
 138 /* general initialization functions */
 139 static int dvb_usb_exit(struct dvb_usb_device *d)
 140 {
 141         deb_info("state before exiting everything: %x\n", d->state);
 142         dvb_usb_remote_exit(d);
 143         dvb_usb_adapter_exit(d);
 144         dvb_usb_i2c_exit(d);
 145         deb_info("state should be zero now: %x\n", d->state);
 146         d->state = DVB_USB_STATE_INIT;
 147
 148         if (d->priv != NULL && d->props.priv_destroy != NULL)
 149                 d->props.priv_destroy(d);
 150
 151         kfree(d->priv);
 152         kfree(d);
 153         return 0;
 154 }
 155
 156 static int dvb_usb_init(struct dvb_usb_device *d, short *adapter_nums)
 157 {
 158         int ret = 0;
 159
 160         mutex_init(&d->data_mutex);
 161         mutex_init(&d->usb_mutex);
 162         mutex_init(&d->i2c_mutex);
 163
 164         d->state = DVB_USB_STATE_INIT;
 165
 166         if (d->props.size_of_priv > 0) {
 167                 d->priv = kzalloc(d->props.size_of_priv, GFP_KERNEL);
 168                 if (d->priv == NULL) {
 169                         err("no memory for priv in 'struct dvb_usb_device'");
 170                         return -ENOMEM;
 171                 }
 172
 173                 if (d->props.priv_init != NULL) {
 174                         ret = d->props.priv_init(d);
 175                         if (ret != 0)
 176                                 goto err_priv_init;
 177                 }
 178         }
 179
 180         /* check the capabilities and set appropriate variables */
 181         dvb_usb_device_power_ctrl(d, 1);
 182
 183         ret = dvb_usb_i2c_init(d);
 184         if (ret)
 185                 goto err_i2c_init;
 186         ret = dvb_usb_adapter_init(d, adapter_nums);
 187         if (ret)
 188                 goto err_adapter_init;
 189
 190         if ((ret = dvb_usb_remote_init(d)))
 191                 err("could not initialize remote control.");
 192
 193         dvb_usb_device_power_ctrl(d, 0);
 194
 195         return 0;
 196
 197 err_adapter_init:
 198         dvb_usb_adapter_exit(d);
 199         dvb_usb_i2c_exit(d);
 200 err_i2c_init:
 201         if (d->priv && d->props.priv_destroy)
 202                 d->props.priv_destroy(d);
 203 err_priv_init:
 204         kfree(d->priv);
 205         d->priv = NULL;
 206         return ret;
 207 }
 208
 209 /* determine the name and the state of the just found USB device */
 210 static const struct dvb_usb_device_description *dvb_usb_find_device(struct usb_device *udev, const struct dvb_usb_device_properties *props, int *cold)
 211 {
 212         int i, j;
 213         const struct dvb_usb_device_description *desc = NULL;
 214
 215         *cold = -1;
 216
 217         for (i = 0; i < props->num_device_descs; i++) {
 218
 219                 for (j = 0; j < DVB_USB_ID_MAX_NUM && props->devices[i].cold_ids[j] != NULL; j++) {
 220                         deb_info("check for cold %x %x\n", props->devices[i].cold_ids[j]->idVendor, props->devices[i].cold_ids[j]->idProduct);
 221                         if (props->devices[i].cold_ids[j]->idVendor  == le16_to_cpu(udev->descriptor.idVendor) &&
 222                                 props->devices[i].cold_ids[j]->idProduct == le16_to_cpu(udev->descriptor.idProduct)) {
 223                                 *cold = 1;
 224                                 desc = &props->devices[i];
 225                                 break;
 226                         }
 227                 }
 228
 229                 if (desc != NULL)
 230                         break;
 231
 232                 for (j = 0; j < DVB_USB_ID_MAX_NUM && props->devices[i].warm_ids[j] != NULL; j++) {
 233                         deb_info("check for warm %x %x\n", props->devices[i].warm_ids[j]->idVendor, props->devices[i].warm_ids[j]->idProduct);
 234                         if (props->devices[i].warm_ids[j]->idVendor == le16_to_cpu(udev->descriptor.idVendor) &&
 235                                 props->devices[i].warm_ids[j]->idProduct == le16_to_cpu(udev->descriptor.idProduct)) {
 236                                 *cold = 0;
 237                                 desc = &props->devices[i];
 238                                 break;
 239                         }
 240                 }
 241         }
 242
 243         if (desc != NULL && props->identify_state != NULL)
 244                 props->identify_state(udev, props, &desc, cold);
 245
 246         return desc;
 247 }
 248
 249 int dvb_usb_device_power_ctrl(struct dvb_usb_device *d, int onoff)
 250 {
 251         if (onoff)
 252                 d->powered++;
 253         else
 254                 d->powered--;
 255
 256         if (d->powered == 0 || (onoff && d->powered == 1)) { /* when switching from 1 to 0 or from 0 to 1 */
 257                 deb_info("power control: %d\n", onoff);
 258                 if (d->props.power_ctrl)
 259                         return d->props.power_ctrl(d, onoff);
 260         }
 261         return 0;
 262 }
 263
 264 /*
 265  * USB
 266  */
 267 int dvb_usb_device_init(struct usb_interface *intf,
 268                         const struct dvb_usb_device_properties *props,
 269                         struct module *owner, struct dvb_usb_device **du,
 270                         short *adapter_nums)
 271 {
 272         struct usb_device *udev = interface_to_usbdev(intf);
 273         struct dvb_usb_device *d = NULL;
 274         const struct dvb_usb_device_description *desc = NULL;
 275
 276         int ret = -ENOMEM, cold = 0;
 277
 278         if (du != NULL)
 279                 *du = NULL;
 280
 281         d = kzalloc(sizeof(*d), GFP_KERNEL);
 282         if (!d) {
 283                 err("no memory for 'struct dvb_usb_device'");
 284                 return -ENOMEM;
 285         }
 286
 287         memcpy(&d->props, props, sizeof(struct dvb_usb_device_properties));
 288
 289         desc = dvb_usb_find_device(udev, &d->props, &cold);
 290         if (!desc) {
 291                 deb_err("something went very wrong, device was not found in current device list - let's see what comes next.\n");
 292                 ret = -ENODEV;
 293                 goto error;
 294         }
 295
 296         if (cold) {
 297                 info("found a '%s' in cold state, will try to load a firmware", desc->name);
 298                 ret = dvb_usb_download_firmware(udev, props);
 299                 if (!props->no_reconnect || ret != 0)
 300                         goto error;
 301         }
 302
 303         info("found a '%s' in warm state.", desc->name);
 304         d->udev = udev;
 305         d->desc = desc;
 306         d->owner = owner;
 307
 308         usb_set_intfdata(intf, d);
 309
 310         ret = dvb_usb_init(d, adapter_nums);
 311         if (ret) {
 312                 info("%s error while loading driver (%d)", desc->name, ret);
 313                 goto error;
 314         }
 315
 316         if (du)
 317                 *du = d;
 318
 319         info("%s successfully initialized and connected.", desc->name);
 320         return 0;
 321
 322  error:
 323         usb_set_intfdata(intf, NULL);
 324         kfree(d);
 325         return ret;
 326 }
 327 EXPORT_SYMBOL(dvb_usb_device_init);
 328
 329 void dvb_usb_device_exit(struct usb_interface *intf)
 330 {
 331         struct dvb_usb_device *d = usb_get_intfdata(intf);
 332         const char *default_name = "generic DVB-USB module";
 333         char name[40];
 334
 335         usb_set_intfdata(intf, NULL);
 336         if (d != NULL && d->desc != NULL) {
 337                 strscpy(name, d->desc->name, sizeof(name));
 338                 dvb_usb_exit(d);
 339         } else {
 340                 strscpy(name, default_name, sizeof(name));
 341         }
 342         info("%s successfully deinitialized and disconnected.", name);
 343
 344 }
 345 EXPORT_SYMBOL(dvb_usb_device_exit);
 346
 347 MODULE_VERSION("1.0");
 348 MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@posteo.de>");
 349 MODULE_DESCRIPTION("A library module containing commonly used USB and DVB function USB DVB devices");
 350 MODULE_LICENSE("GPL");