drivers/media/firewire/firedtv-fw.c

   1 /*
   2  * FireDTV driver -- firewire I/O backend
   3  */
   4
   5 #include <linux/device.h>
   6 #include <linux/errno.h>
   7 #include <linux/firewire.h>
   8 #include <linux/firewire-constants.h>
   9 #include <linux/kernel.h>
  10 #include <linux/list.h>
  11 #include <linux/mm.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/module.h>
  14 #include <linux/mutex.h>
  15 #include <linux/slab.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/string.h>
  18 #include <linux/types.h>
  19 #include <linux/wait.h>
  20 #include <linux/workqueue.h>
  21
  22 #include <asm/page.h>
  23
  24 #include <media/dvb_demux.h>
  25
  26 #include "firedtv.h"
  27
  28 static LIST_HEAD(node_list);
  29 static DEFINE_SPINLOCK(node_list_lock);
  30
  31 static inline struct fw_device *device_of(struct firedtv *fdtv)
  32 {
  33         return fw_device(fdtv->device->parent);
  34 }
  35
  36 static int node_req(struct firedtv *fdtv, u64 addr, void *data, size_t len,
  37                     int tcode)
  38 {
  39         struct fw_device *device = device_of(fdtv);
  40         int rcode, generation = device->generation;
  41
  42         smp_rmb(); /* node_id vs. generation */
  43
  44         rcode = fw_run_transaction(device->card, tcode, device->node_id,
  45                         generation, device->max_speed, addr, data, len);
  46
  47         return rcode != RCODE_COMPLETE ? -EIO : 0;
  48 }
  49
  50 int fdtv_lock(struct firedtv *fdtv, u64 addr, void *data)
  51 {
  52         return node_req(fdtv, addr, data, 8, TCODE_LOCK_COMPARE_SWAP);
  53 }
  54
  55 int fdtv_read(struct firedtv *fdtv, u64 addr, void *data)
  56 {
  57         return node_req(fdtv, addr, data, 4, TCODE_READ_QUADLET_REQUEST);
  58 }
  59
  60 int fdtv_write(struct firedtv *fdtv, u64 addr, void *data, size_t len)
  61 {
  62         return node_req(fdtv, addr, data, len, TCODE_WRITE_BLOCK_REQUEST);
  63 }
  64
  65 #define ISO_HEADER_SIZE                 4
  66 #define CIP_HEADER_SIZE                 8
  67 #define MPEG2_TS_HEADER_SIZE            4
  68 #define MPEG2_TS_SOURCE_PACKET_SIZE     (4 + 188)
  69
  70 #define MAX_PACKET_SIZE         1024  /* 776, rounded up to 2^n */
  71 #define PACKETS_PER_PAGE        (PAGE_SIZE / MAX_PACKET_SIZE)
  72 #define N_PACKETS               64    /* buffer size */
  73 #define N_PAGES                 DIV_ROUND_UP(N_PACKETS, PACKETS_PER_PAGE)
  74 #define IRQ_INTERVAL            16
  75
  76 struct fdtv_ir_context {
  77         struct fw_iso_context *context;
  78         struct fw_iso_buffer buffer;
  79         int interrupt_packet;
  80         int current_packet;
  81         char *pages[N_PAGES];
  82 };
  83
  84 static int queue_iso(struct fdtv_ir_context *ctx, int index)
  85 {
  86         struct fw_iso_packet p;
  87
  88         p.payload_length = MAX_PACKET_SIZE;
  89         p.interrupt = !(++ctx->interrupt_packet & (IRQ_INTERVAL - 1));
  90         p.skip = 0;
  91         p.header_length = ISO_HEADER_SIZE;
  92
  93         return fw_iso_context_queue(ctx->context, &p, &ctx->buffer,
  94                                     index * MAX_PACKET_SIZE);
  95 }
  96
  97 static void handle_iso(struct fw_iso_context *context, u32 cycle,
  98                        size_t header_length, void *header, void *data)
  99 {
 100         struct firedtv *fdtv = data;
 101         struct fdtv_ir_context *ctx = fdtv->ir_context;
 102         __be32 *h, *h_end;
 103         int length, err, i = ctx->current_packet;
 104         char *p, *p_end;
 105
 106         for (h = header, h_end = h + header_length / 4; h < h_end; h++) {
 107                 length = be32_to_cpup(h) >> 16;
 108                 if (unlikely(length > MAX_PACKET_SIZE)) {
 109                         dev_err(fdtv->device, "length = %d\n", length);
 110                         length = MAX_PACKET_SIZE;
 111                 }
 112
 113                 p = ctx->pages[i / PACKETS_PER_PAGE]
 114                                 + (i % PACKETS_PER_PAGE) * MAX_PACKET_SIZE;
 115                 p_end = p + length;
 116
 117                 for (p += CIP_HEADER_SIZE + MPEG2_TS_HEADER_SIZE; p < p_end;
 118                      p += MPEG2_TS_SOURCE_PACKET_SIZE)
 119                         dvb_dmx_swfilter_packets(&fdtv->demux, p, 1);
 120
 121                 err = queue_iso(ctx, i);
 122                 if (unlikely(err))
 123                         dev_err(fdtv->device, "requeue failed\n");
 124
 125                 i = (i + 1) & (N_PACKETS - 1);
 126         }
 127         fw_iso_context_queue_flush(ctx->context);
 128         ctx->current_packet = i;
 129 }
 130
 131 int fdtv_start_iso(struct firedtv *fdtv)
 132 {
 133         struct fdtv_ir_context *ctx;
 134         struct fw_device *device = device_of(fdtv);
 135         int i, err;
 136
 137         ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
 138         if (!ctx)
 139                 return -ENOMEM;
 140
 141         ctx->context = fw_iso_context_create(device->card,
 142                         FW_ISO_CONTEXT_RECEIVE, fdtv->isochannel,
 143                         device->max_speed, ISO_HEADER_SIZE, handle_iso, fdtv);
 144         if (IS_ERR(ctx->context)) {
 145                 err = PTR_ERR(ctx->context);
 146                 goto fail_free;
 147         }
 148
 149         err = fw_iso_buffer_init(&ctx->buffer, device->card,
 150                                  N_PAGES, DMA_FROM_DEVICE);
 151         if (err)
 152                 goto fail_context_destroy;
 153
 154         ctx->interrupt_packet = 0;
 155         ctx->current_packet = 0;
 156
 157         for (i = 0; i < N_PAGES; i++)
 158                 ctx->pages[i] = page_address(ctx->buffer.pages[i]);
 159
 160         for (i = 0; i < N_PACKETS; i++) {
 161                 err = queue_iso(ctx, i);
 162                 if (err)
 163                         goto fail;
 164         }
 165
 166         err = fw_iso_context_start(ctx->context, -1, 0,
 167                                    FW_ISO_CONTEXT_MATCH_ALL_TAGS);
 168         if (err)
 169                 goto fail;
 170
 171         fdtv->ir_context = ctx;
 172
 173         return 0;
 174 fail:
 175         fw_iso_buffer_destroy(&ctx->buffer, device->card);
 176 fail_context_destroy:
 177         fw_iso_context_destroy(ctx->context);
 178 fail_free:
 179         kfree(ctx);
 180
 181         return err;
 182 }
 183
 184 void fdtv_stop_iso(struct firedtv *fdtv)
 185 {
 186         struct fdtv_ir_context *ctx = fdtv->ir_context;
 187
 188         fw_iso_context_stop(ctx->context);
 189         fw_iso_buffer_destroy(&ctx->buffer, device_of(fdtv)->card);
 190         fw_iso_context_destroy(ctx->context);
 191         kfree(ctx);
 192 }
 193
 194 static void handle_fcp(struct fw_card *card, struct fw_request *request,
 195                        int tcode, int destination, int source, int generation,
 196                        unsigned long long offset, void *payload, size_t length,
 197                        void *callback_data)
 198 {
 199         struct firedtv *f, *fdtv = NULL;
 200         struct fw_device *device;
 201         unsigned long flags;
 202         int su;
 203
 204         if (length < 2 || (((u8 *)payload)[0] & 0xf0) != 0)
 205                 return;
 206
 207         su = ((u8 *)payload)[1] & 0x7;
 208
 209         spin_lock_irqsave(&node_list_lock, flags);
 210         list_for_each_entry(f, &node_list, list) {
 211                 device = device_of(f);
 212                 if (device->generation != generation)
 213                         continue;
 214
 215                 smp_rmb(); /* node_id vs. generation */
 216
 217                 if (device->card == card &&
 218                     device->node_id == source &&
 219                     (f->subunit == su || (f->subunit == 0 && su == 0x7))) {
 220                         fdtv = f;
 221                         break;
 222                 }
 223         }
 224         spin_unlock_irqrestore(&node_list_lock, flags);
 225
 226         if (fdtv)
 227                 avc_recv(fdtv, payload, length);
 228 }
 229
 230 static struct fw_address_handler fcp_handler = {
 231         .length           = CSR_FCP_END - CSR_FCP_RESPONSE,
 232         .address_callback = handle_fcp,
 233 };
 234
 235 static const struct fw_address_region fcp_region = {
 236         .start  = CSR_REGISTER_BASE + CSR_FCP_RESPONSE,
 237         .end    = CSR_REGISTER_BASE + CSR_FCP_END,
 238 };
 239
 240 static const char * const model_names[] = {
 241         [FIREDTV_UNKNOWN] = "unknown type",
 242         [FIREDTV_DVB_S]   = "FireDTV S/CI",
 243         [FIREDTV_DVB_C]   = "FireDTV C/CI",
 244         [FIREDTV_DVB_T]   = "FireDTV T/CI",
 245         [FIREDTV_DVB_S2]  = "FireDTV S2  ",
 246 };
 247
 248 /* Adjust the template string if models with longer names appear. */
 249 #define MAX_MODEL_NAME_LEN sizeof("FireDTV ????")
 250
 251 static int node_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
 252 {
 253         struct firedtv *fdtv;
 254         char name[MAX_MODEL_NAME_LEN];
 255         int name_len, i, err;
 256
 257         fdtv = kzalloc(sizeof(*fdtv), GFP_KERNEL);
 258         if (!fdtv)
 259                 return -ENOMEM;
 260
 261         dev_set_drvdata(&unit->device, fdtv);
 262         fdtv->device            = &unit->device;
 263         fdtv->isochannel        = -1;
 264         fdtv->voltage           = 0xff;
 265         fdtv->tone              = 0xff;
 266
 267         mutex_init(&fdtv->avc_mutex);
 268         init_waitqueue_head(&fdtv->avc_wait);
 269         mutex_init(&fdtv->demux_mutex);
 270         INIT_WORK(&fdtv->remote_ctrl_work, avc_remote_ctrl_work);
 271
 272         name_len = fw_csr_string(unit->directory, CSR_MODEL,
 273                                  name, sizeof(name));
 274         for (i = ARRAY_SIZE(model_names); --i; )
 275                 if (strlen(model_names[i]) <= name_len &&
 276                     strncmp(name, model_names[i], name_len) == 0)
 277                         break;
 278         fdtv->type = i;
 279
 280         err = fdtv_register_rc(fdtv, &unit->device);
 281         if (err)
 282                 goto fail_free;
 283
 284         spin_lock_irq(&node_list_lock);
 285         list_add_tail(&fdtv->list, &node_list);
 286         spin_unlock_irq(&node_list_lock);
 287
 288         err = avc_identify_subunit(fdtv);
 289         if (err)
 290                 goto fail;
 291
 292         err = fdtv_dvb_register(fdtv, model_names[fdtv->type]);
 293         if (err)
 294                 goto fail;
 295
 296         avc_register_remote_control(fdtv);
 297
 298         return 0;
 299 fail:
 300         spin_lock_irq(&node_list_lock);
 301         list_del(&fdtv->list);
 302         spin_unlock_irq(&node_list_lock);
 303         fdtv_unregister_rc(fdtv);
 304 fail_free:
 305         kfree(fdtv);
 306
 307         return err;
 308 }
 309
 310 static void node_remove(struct fw_unit *unit)
 311 {
 312         struct firedtv *fdtv = dev_get_drvdata(&unit->device);
 313
 314         fdtv_dvb_unregister(fdtv);
 315
 316         spin_lock_irq(&node_list_lock);
 317         list_del(&fdtv->list);
 318         spin_unlock_irq(&node_list_lock);
 319
 320         fdtv_unregister_rc(fdtv);
 321
 322         kfree(fdtv);
 323 }
 324
 325 static void node_update(struct fw_unit *unit)
 326 {
 327         struct firedtv *fdtv = dev_get_drvdata(&unit->device);
 328
 329         if (fdtv->isochannel >= 0)
 330                 cmp_establish_pp_connection(fdtv, fdtv->subunit,
 331                                             fdtv->isochannel);
 332 }
 333
 334 #define MATCH_FLAGS (IEEE1394_MATCH_VENDOR_ID | IEEE1394_MATCH_MODEL_ID | \
 335                      IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION)
 336
 337 #define DIGITAL_EVERYWHERE_OUI  0x001287
 338 #define AVC_UNIT_SPEC_ID_ENTRY  0x00a02d
 339 #define AVC_SW_VERSION_ENTRY    0x010001
 340
 341 static const struct ieee1394_device_id fdtv_id_table[] = {
 342         {
 343                 /* FloppyDTV S/CI and FloppyDTV S2 */
 344                 .match_flags    = MATCH_FLAGS,
 345                 .vendor_id      = DIGITAL_EVERYWHERE_OUI,
 346                 .model_id       = 0x000024,
 347                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY,
 348                 .version        = AVC_SW_VERSION_ENTRY,
 349         }, {
 350                 /* FloppyDTV T/CI */
 351                 .match_flags    = MATCH_FLAGS,
 352                 .vendor_id      = DIGITAL_EVERYWHERE_OUI,
 353                 .model_id       = 0x000025,
 354                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY,
 355                 .version        = AVC_SW_VERSION_ENTRY,
 356         }, {
 357                 /* FloppyDTV C/CI */
 358                 .match_flags    = MATCH_FLAGS,
 359                 .vendor_id      = DIGITAL_EVERYWHERE_OUI,
 360                 .model_id       = 0x000026,
 361                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY,
 362                 .version        = AVC_SW_VERSION_ENTRY,
 363         }, {
 364                 /* FireDTV S/CI and FloppyDTV S2 */
 365                 .match_flags    = MATCH_FLAGS,
 366                 .vendor_id      = DIGITAL_EVERYWHERE_OUI,
 367                 .model_id       = 0x000034,
 368                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY,
 369                 .version        = AVC_SW_VERSION_ENTRY,
 370         }, {
 371                 /* FireDTV T/CI */
 372                 .match_flags    = MATCH_FLAGS,
 373                 .vendor_id      = DIGITAL_EVERYWHERE_OUI,
 374                 .model_id       = 0x000035,
 375                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY,
 376                 .version        = AVC_SW_VERSION_ENTRY,
 377         }, {
 378                 /* FireDTV C/CI */
 379                 .match_flags    = MATCH_FLAGS,
 380                 .vendor_id      = DIGITAL_EVERYWHERE_OUI,
 381                 .model_id       = 0x000036,
 382                 .specifier_id   = AVC_UNIT_SPEC_ID_ENTRY,
 383                 .version        = AVC_SW_VERSION_ENTRY,
 384         }, {}
 385 };
 386 MODULE_DEVICE_TABLE(ieee1394, fdtv_id_table);
 387
 388 static struct fw_driver fdtv_driver = {
 389         .driver   = {
 390                 .owner  = THIS_MODULE,
 391                 .name   = "firedtv",
 392                 .bus    = &fw_bus_type,
 393         },
 394         .probe    = node_probe,
 395         .update   = node_update,
 396         .remove   = node_remove,
 397         .id_table = fdtv_id_table,
 398 };
 399
 400 static int __init fdtv_init(void)
 401 {
 402         int ret;
 403
 404         ret = fw_core_add_address_handler(&fcp_handler, &fcp_region);
 405         if (ret < 0)
 406                 return ret;
 407
 408         ret = driver_register(&fdtv_driver.driver);
 409         if (ret < 0)
 410                 fw_core_remove_address_handler(&fcp_handler);
 411
 412         return ret;
 413 }
 414
 415 static void __exit fdtv_exit(void)
 416 {
 417         driver_unregister(&fdtv_driver.driver);
 418         fw_core_remove_address_handler(&fcp_handler);
 419 }
 420
 421 module_init(fdtv_init);
 422 module_exit(fdtv_exit);
 423
 424 MODULE_AUTHOR("Andreas Monitzer <andy@monitzer.com>");
 425 MODULE_AUTHOR("Ben Backx <ben@bbackx.com>");
 426 MODULE_DESCRIPTION("FireDTV DVB Driver");
 427 MODULE_LICENSE("GPL");
 428 MODULE_SUPPORTED_DEVICE("FireDTV DVB");