SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/spinlock.h>
  19 #include <linux/types.h>
  20
  21 #include <dma.h>
  22 #include <csr1212.h>
  23 #include <highlevel.h>
  24 #include <hosts.h>
  25 #include <ieee1394.h>
  26 #include <iso.h>
  27 #include <nodemgr.h>
  28
  29 #include <dvb_demux.h>
  30
  31 #include "firedtv.h"
  32
  33 static LIST_HEAD(node_list);
  34 static DEFINE_SPINLOCK(node_list_lock);
  35
  36 #define CIP_HEADER_SIZE                 8
  37 #define MPEG2_TS_HEADER_SIZE            4
  38 #define MPEG2_TS_SOURCE_PACKET_SIZE     (4 + 188)
  39
  40 static void rawiso_activity_cb(struct hpsb_iso *iso)
  41 {
  42         struct firedtv *f, *fdtv = NULL;
  43         unsigned int i, num, packet;
  44         unsigned char *buf;
  45         unsigned long flags;
  46         int count;
  47
  48         spin_lock_irqsave(&node_list_lock, flags);
  49         list_for_each_entry(f, &node_list, list)
  50                 if (f->backend_data == iso) {
  51                         fdtv = f;
  52                         break;
  53                 }
  54         spin_unlock_irqrestore(&node_list_lock, flags);
  55
  56         packet = iso->first_packet;
  57         num = hpsb_iso_n_ready(iso);
  58
  59         if (!fdtv) {
  60                 dev_err(fdtv->device, "received at unknown iso channel\n");
  61                 goto out;
  62         }
  63
  64         for (i = 0; i < num; i++, packet = (packet + 1) % iso->buf_packets) {
  65                 buf = dma_region_i(&iso->data_buf, unsigned char,
  66                         iso->infos[packet].offset + CIP_HEADER_SIZE);
  67                 count = (iso->infos[packet].len - CIP_HEADER_SIZE) /
  68                         MPEG2_TS_SOURCE_PACKET_SIZE;
  69
  70                 /* ignore empty packet */
  71                 if (iso->infos[packet].len <= CIP_HEADER_SIZE)
  72                         continue;
  73
  74                 while (count--) {
  75                         if (buf[MPEG2_TS_HEADER_SIZE] == 0x47)
  76                                 dvb_dmx_swfilter_packets(&fdtv->demux,
  77                                                 &buf[MPEG2_TS_HEADER_SIZE], 1);
  78                         else
  79                                 dev_err(fdtv->device,
  80                                         "skipping invalid packet\n");
  81                         buf += MPEG2_TS_SOURCE_PACKET_SIZE;
  82                 }
  83         }
  84 out:
  85         hpsb_iso_recv_release_packets(iso, num);
  86 }
  87
  88 static inline struct node_entry *node_of(struct firedtv *fdtv)
  89 {
  90         return container_of(fdtv->device, struct unit_directory, device)->ne;
  91 }
  92
  93 static int node_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
  94 {
  95         int ret;
  96
  97         ret = hpsb_node_lock(node_of(fdtv), addr, EXTCODE_COMPARE_SWAP,
  98                 (__force quadlet_t *)&data[1], (__force quadlet_t)data[0]);
  99         data[0] = data[1];
 100
 101         return ret;
 102 }
 103
 104 static int node_read(struct firedtv *fdtv, u64 addr, void *data, size_t len)
 105 {
 106         return hpsb_node_read(node_of(fdtv), addr, data, len);
 107 }
 108
 109 static int node_write(struct firedtv *fdtv, u64 addr, void *data, size_t len)
 110 {
 111         return hpsb_node_write(node_of(fdtv), addr, data, len);
 112 }
 113
 114 #define FDTV_ISO_BUFFER_PACKETS 256
 115 #define FDTV_ISO_BUFFER_SIZE (FDTV_ISO_BUFFER_PACKETS * 200)
 116
 117 static int start_iso(struct firedtv *fdtv)
 118 {
 119         struct hpsb_iso *iso_handle;
 120         int ret;
 121
 122         iso_handle = hpsb_iso_recv_init(node_of(fdtv)->host,
 123                                 FDTV_ISO_BUFFER_SIZE, FDTV_ISO_BUFFER_PACKETS,
 124                                 fdtv->isochannel, HPSB_ISO_DMA_DEFAULT,
 125                                 -1, /* stat.config.irq_interval */
 126                                 rawiso_activity_cb);
 127         if (iso_handle == NULL) {
 128                 dev_err(fdtv->device, "cannot initialize iso receive\n");
 129                 return -ENOMEM;
 130         }
 131         fdtv->backend_data = iso_handle;
 132
 133         ret = hpsb_iso_recv_start(iso_handle, -1, -1, 0);
 134         if (ret != 0) {
 135                 dev_err(fdtv->device, "cannot start iso receive\n");
 136                 hpsb_iso_shutdown(iso_handle);
 137                 fdtv->backend_data = NULL;
 138         }
 139         return ret;
 140 }
 141
 142 static void stop_iso(struct firedtv *fdtv)
 143 {
 144         struct hpsb_iso *iso_handle = fdtv->backend_data;
 145
 146         if (iso_handle != NULL) {
 147                 hpsb_iso_stop(iso_handle);
 148                 hpsb_iso_shutdown(iso_handle);
 149         }
 150         fdtv->backend_data = NULL;
 151 }
 152
 153 static const struct firedtv_backend fdtv_1394_backend = {
 154         .lock           = node_lock,
 155         .read           = node_read,
 156         .write          = node_write,
 157         .start_iso      = start_iso,
 158         .stop_iso       = stop_iso,
 159 };
 160
 161 static void fcp_request(struct hpsb_host *host, int nodeid, int direction,
 162                         int cts, u8 *data, size_t length)
 163 {
 164         struct firedtv *f, *fdtv = NULL;
 165         unsigned long flags;
 166         int su;
 167
 168         if (length == 0 || (data[0] & 0xf0) != 0)
 169                 return;
 170
 171         su = data[1] & 0x7;
 172
 173         spin_lock_irqsave(&node_list_lock, flags);
 174         list_for_each_entry(f, &node_list, list)
 175                 if (node_of(f)->host == host &&
 176                     node_of(f)->nodeid == nodeid &&
 177                     (f->subunit == su || (f->subunit == 0 && su == 0x7))) {
 178                         fdtv = f;
 179                         break;
 180                 }
 181         spin_unlock_irqrestore(&node_list_lock, flags);
 182
 183         if (fdtv)
 184                 avc_recv(fdtv, data, length);
 185 }
 186
 187 static int node_probe(struct device *dev)
 188 {
 189         struct unit_directory *ud =
 190                         container_of(dev, struct unit_directory, device);
 191         struct firedtv *fdtv;
 192         int kv_len, err;
 193         void *kv_str;
 194
 195         kv_len = (ud->model_name_kv->value.leaf.len - 2) * sizeof(quadlet_t);
 196         kv_str = CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(ud->model_name_kv);
 197
 198         fdtv = fdtv_alloc(dev, &fdtv_1394_backend, kv_str, kv_len);
 199         if (!fdtv)
 200                 return -ENOMEM;
 201
 202         /*
 203          * Work around a bug in udev's path_id script:  Use the fw-host's dev
 204          * instead of the unit directory's dev as parent of the input device.
 205          */
 206         err = fdtv_register_rc(fdtv, dev->parent->parent);
 207         if (err)
 208                 goto fail_free;
 209
 210         spin_lock_irq(&node_list_lock);
 211         list_add_tail(&fdtv->list, &node_list);
 212         spin_unlock_irq(&node_list_lock);
 213
 214         err = avc_identify_subunit(fdtv);
 215         if (err)
 216                 goto fail;
 217
 218         err = fdtv_dvb_register(fdtv);
 219         if (err)
 220                 goto fail;
 221
 222         avc_register_remote_control(fdtv);
 223
 224         return 0;
 225 fail:
 226         spin_lock_irq(&node_list_lock);
 227         list_del(&fdtv->list);
 228         spin_unlock_irq(&node_list_lock);
 229         fdtv_unregister_rc(fdtv);
 230 fail_free:
 231         kfree(fdtv);
 232
 233         return err;
 234 }
 235
 236 static int node_remove(struct device *dev)
 237 {
 238         struct firedtv *fdtv = dev_get_drvdata(dev);
 239
 240         fdtv_dvb_unregister(fdtv);
 241
 242         spin_lock_irq(&node_list_lock);
 243         list_del(&fdtv->list);
 244         spin_unlock_irq(&node_list_lock);
 245
 246         fdtv_unregister_rc(fdtv);
 247         kfree(fdtv);
 248
 249         return 0;
 250 }
 251
 252 static int node_update(struct unit_directory *ud)
 253 {
 254         struct firedtv *fdtv = dev_get_drvdata(&ud->device);
 255
 256         if (fdtv->isochannel >= 0)
 257                 cmp_establish_pp_connection(fdtv, fdtv->subunit,
 258                                             fdtv->isochannel);
 259         return 0;
 260 }
 261
 262 static struct hpsb_protocol_driver fdtv_driver = {
 263         .name           = "firedtv",
 264         .id_table       = fdtv_id_table,
 265         .update         = node_update,
 266         .driver         = {
 267                 .probe  = node_probe,
 268                 .remove = node_remove,
 269         },
 270 };
 271
 272 static struct hpsb_highlevel fdtv_highlevel = {
 273         .name           = "firedtv",
 274         .fcp_request    = fcp_request,
 275 };
 276
 277 int __init fdtv_1394_init(void)
 278 {
 279         int ret;
 280
 281         hpsb_register_highlevel(&fdtv_highlevel);
 282         ret = hpsb_register_protocol(&fdtv_driver);
 283         if (ret) {
 284                 printk(KERN_ERR "firedtv: failed to register protocol\n");
 285                 hpsb_unregister_highlevel(&fdtv_highlevel);
 286         }
 287         return ret;
 288 }
 289
 290 void __exit fdtv_1394_exit(void)
 291 {
 292         hpsb_unregister_protocol(&fdtv_driver);
 293         hpsb_unregister_highlevel(&fdtv_highlevel);
 294 }