drivers/media/dvb/firewire/firedtv-1394.c

   1 /*
   2  * FireDTV driver -- ieee1394 I/O backend
   3  *
   4  * Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
   5  * Copyright (C) 2007-2008 Ben Backx <ben@bbackx.com>
   6  * Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
   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 as
  10  *      published by the Free Software Foundation; either version 2 of
  11  *      the License, or (at your option) any later version.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel.h>
  17 #include <linux/list.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/types.h>
  21
  22 #include <dma.h>
  23 #include <csr1212.h>
  24 #include <highlevel.h>
  25 #include <hosts.h>
  26 #include <ieee1394.h>
  27 #include <iso.h>
  28 #include <nodemgr.h>
  29
  30 #include <dvb_demux.h>
  31
  32 #include "firedtv.h"
  33
  34 static LIST_HEAD(node_list);
  35 static DEFINE_SPINLOCK(node_list_lock);
  36
  37 #define CIP_HEADER_SIZE                 8
  38 #define MPEG2_TS_HEADER_SIZE            4
  39 #define MPEG2_TS_SOURCE_PACKET_SIZE     (4 + 188)
  40
  41 static void rawiso_activity_cb(struct hpsb_iso *iso)
  42 {
  43         struct firedtv *f, *fdtv = NULL;
  44         unsigned int i, num, packet;
  45         unsigned char *buf;
  46         unsigned long flags;
  47         int count;
  48
  49         spin_lock_irqsave(&node_list_lock, flags);
  50         list_for_each_entry(f, &node_list, list)
  51                 if (f->backend_data == iso) {
  52                         fdtv = f;
  53                         break;
  54                 }
  55         spin_unlock_irqrestore(&node_list_lock, flags);
  56
  57         packet = iso->first_packet;
  58         num = hpsb_iso_n_ready(iso);
  59
  60         if (!fdtv) {
  61                 pr_err("received at unknown iso channel\n");
  62                 goto out;
  63         }
  64
  65         for (i = 0; i < num; i++, packet = (packet + 1) % iso->buf_packets) {
  66                 buf = dma_region_i(&iso->data_buf, unsigned char,
  67                         iso->infos[packet].offset + CIP_HEADER_SIZE);
  68                 count = (iso->infos[packet].len - CIP_HEADER_SIZE) /
  69                         MPEG2_TS_SOURCE_PACKET_SIZE;
  70
  71                 /* ignore empty packet */
  72                 if (iso->infos[packet].len <= CIP_HEADER_SIZE)
  73                         continue;
  74
  75                 while (count--) {
  76                         if (buf[MPEG2_TS_HEADER_SIZE] == 0x47)
  77                                 dvb_dmx_swfilter_packets(&fdtv->demux,
  78                                                 &buf[MPEG2_TS_HEADER_SIZE], 1);
  79                         else
  80                                 dev_err(fdtv->device,
  81                                         "skipping invalid packet\n");
  82                         buf += MPEG2_TS_SOURCE_PACKET_SIZE;
  83                 }
  84         }
  85 out:
  86         hpsb_iso_recv_release_packets(iso, num);
  87 }
  88
  89 static inline struct node_entry *node_of(struct firedtv *fdtv)
  90 {
  91         return container_of(fdtv->device, struct unit_directory, device)->ne;
  92 }
  93
  94 static int node_lock(struct firedtv *fdtv, u64 addr, void *data)
  95 {
  96         quadlet_t *d = data;
  97         int ret;
  98
  99         ret = hpsb_node_lock(node_of(fdtv), addr,
 100                              EXTCODE_COMPARE_SWAP, &d[1], d[0]);
 101         d[0] = d[1];
 102
 103         return ret;
 104 }
 105
 106 static int node_read(struct firedtv *fdtv, u64 addr, void *data)
 107 {
 108         return hpsb_node_read(node_of(fdtv), addr, data, 4);
 109 }
 110
 111 static int node_write(struct firedtv *fdtv, u64 addr, void *data, size_t len)
 112 {
 113         return hpsb_node_write(node_of(fdtv), addr, data, len);
 114 }
 115
 116 #define FDTV_ISO_BUFFER_PACKETS 256
 117 #define FDTV_ISO_BUFFER_SIZE (FDTV_ISO_BUFFER_PACKETS * 200)
 118
 119 static int start_iso(struct firedtv *fdtv)
 120 {
 121         struct hpsb_iso *iso_handle;
 122         int ret;
 123
 124         iso_handle = hpsb_iso_recv_init(node_of(fdtv)->host,
 125                                 FDTV_ISO_BUFFER_SIZE, FDTV_ISO_BUFFER_PACKETS,
 126                                 fdtv->isochannel, HPSB_ISO_DMA_DEFAULT,
 127                                 -1, /* stat.config.irq_interval */
 128                                 rawiso_activity_cb);
 129         if (iso_handle == NULL) {
 130                 dev_err(fdtv->device, "cannot initialize iso receive\n");
 131                 return -ENOMEM;
 132         }
 133         fdtv->backend_data = iso_handle;
 134
 135         ret = hpsb_iso_recv_start(iso_handle, -1, -1, 0);
 136         if (ret != 0) {
 137                 dev_err(fdtv->device, "cannot start iso receive\n");
 138                 hpsb_iso_shutdown(iso_handle);
 139                 fdtv->backend_data = NULL;
 140         }
 141         return ret;
 142 }
 143
 144 static void stop_iso(struct firedtv *fdtv)
 145 {
 146         struct hpsb_iso *iso_handle = fdtv->backend_data;
 147
 148         if (iso_handle != NULL) {
 149                 hpsb_iso_stop(iso_handle);
 150                 hpsb_iso_shutdown(iso_handle);
 151         }
 152         fdtv->backend_data = NULL;
 153 }
 154
 155 static const struct firedtv_backend fdtv_1394_backend = {
 156         .lock           = node_lock,
 157         .read           = node_read,
 158         .write          = node_write,
 159         .start_iso      = start_iso,
 160         .stop_iso       = stop_iso,
 161 };
 162
 163 static void fcp_request(struct hpsb_host *host, int nodeid, int direction,
 164                         int cts, u8 *data, size_t length)
 165 {
 166         struct firedtv *f, *fdtv = NULL;
 167         unsigned long flags;
 168         int su;
 169
 170         if (length == 0 || (data[0] & 0xf0) != 0)
 171                 return;
 172
 173         su = data[1] & 0x7;
 174
 175         spin_lock_irqsave(&node_list_lock, flags);
 176         list_for_each_entry(f, &node_list, list)
 177                 if (node_of(f)->host == host &&
 178                     node_of(f)->nodeid == nodeid &&
 179                     (f->subunit == su || (f->subunit == 0 && su == 0x7))) {
 180                         fdtv = f;
 181                         break;
 182                 }
 183         spin_unlock_irqrestore(&node_list_lock, flags);
 184
 185         if (fdtv)
 186                 avc_recv(fdtv, data, length);
 187 }
 188
 189 static int node_probe(struct device *dev)
 190 {
 191         struct unit_directory *ud =
 192                         container_of(dev, struct unit_directory, device);
 193         struct firedtv *fdtv;
 194         int kv_len, err;
 195         void *kv_str;
 196
 197         if (ud->model_name_kv) {
 198                 kv_len = (ud->model_name_kv->value.leaf.len - 2) * 4;
 199                 kv_str = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(ud->model_name_kv);
 200         } else {
 201                 kv_len = 0;
 202                 kv_str = NULL;
 203         }
 204         fdtv = fdtv_alloc(dev, &fdtv_1394_backend, kv_str, kv_len);
 205         if (!fdtv)
 206                 return -ENOMEM;
 207
 208         /*
 209          * Work around a bug in udev's path_id script:  Use the fw-host's dev
 210          * instead of the unit directory's dev as parent of the input device.
 211          */
 212         err = fdtv_register_rc(fdtv, dev->parent->parent);
 213         if (err)
 214                 goto fail_free;
 215
 216         spin_lock_irq(&node_list_lock);
 217         list_add_tail(&fdtv->list, &node_list);
 218         spin_unlock_irq(&node_list_lock);
 219
 220         err = avc_identify_subunit(fdtv);
 221         if (err)
 222                 goto fail;
 223
 224         err = fdtv_dvb_register(fdtv);
 225         if (err)
 226                 goto fail;
 227
 228         avc_register_remote_control(fdtv);
 229
 230         return 0;
 231 fail:
 232         spin_lock_irq(&node_list_lock);
 233         list_del(&fdtv->list);
 234         spin_unlock_irq(&node_list_lock);
 235         fdtv_unregister_rc(fdtv);
 236 fail_free:
 237         kfree(fdtv);
 238
 239         return err;
 240 }
 241
 242 static int node_remove(struct device *dev)
 243 {
 244         struct firedtv *fdtv = dev_get_drvdata(dev);
 245
 246         fdtv_dvb_unregister(fdtv);
 247
 248         spin_lock_irq(&node_list_lock);
 249         list_del(&fdtv->list);
 250         spin_unlock_irq(&node_list_lock);
 251
 252         fdtv_unregister_rc(fdtv);
 253         kfree(fdtv);
 254
 255         return 0;
 256 }
 257
 258 static int node_update(struct unit_directory *ud)
 259 {
 260         struct firedtv *fdtv = dev_get_drvdata(&ud->device);
 261
 262         if (fdtv->isochannel >= 0)
 263                 cmp_establish_pp_connection(fdtv, fdtv->subunit,
 264                                             fdtv->isochannel);
 265         return 0;
 266 }
 267
 268 static struct hpsb_protocol_driver fdtv_driver = {
 269         .name           = "firedtv",
 270         .id_table       = fdtv_id_table,
 271         .update         = node_update,
 272         .driver         = {
 273                 .probe  = node_probe,
 274                 .remove = node_remove,
 275         },
 276 };
 277
 278 static struct hpsb_highlevel fdtv_highlevel = {
 279         .name           = "firedtv",
 280         .fcp_request    = fcp_request,
 281 };
 282
 283 int __init fdtv_1394_init(void)
 284 {
 285         int ret;
 286
 287         hpsb_register_highlevel(&fdtv_highlevel);
 288         ret = hpsb_register_protocol(&fdtv_driver);
 289         if (ret) {
 290                 printk(KERN_ERR "firedtv: failed to register protocol\n");
 291                 hpsb_unregister_highlevel(&fdtv_highlevel);
 292         }
 293         return ret;
 294 }
 295
 296 void __exit fdtv_1394_exit(void)
 297 {
 298         hpsb_unregister_protocol(&fdtv_driver);
 299         hpsb_unregister_highlevel(&fdtv_highlevel);
 300 }