kernel/drivers/media/radio/wl128x/fmdrv_common.c

   1 /*
   2  *  FM Driver for Connectivity chip of Texas Instruments.
   3  *
   4  *  This sub-module of FM driver is common for FM RX and TX
   5  *  functionality. This module is responsible for:
   6  *  1) Forming group of Channel-8 commands to perform particular
   7  *     functionality (eg., frequency set require more than
   8  *     one Channel-8 command to be sent to the chip).
   9  *  2) Sending each Channel-8 command to the chip and reading
  10  *     response back over Shared Transport.
  11  *  3) Managing TX and RX Queues and Tasklets.
  12  *  4) Handling FM Interrupt packet and taking appropriate action.
  13  *  5) Loading FM firmware to the chip (common, FM TX, and FM RX
  14  *     firmware files based on mode selection)
  15  *
  16  *  Copyright (C) 2011 Texas Instruments
  17  *  Author: Raja Mani <raja_mani@ti.com>
  18  *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License version 2 as
  22  *  published by the Free Software Foundation.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  *
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/firmware.h>
  37 #include <linux/delay.h>
  38 #include "fmdrv.h"
  39 #include "fmdrv_v4l2.h"
  40 #include "fmdrv_common.h"
  41 #include <linux/ti_wilink_st.h>
  42 #include "fmdrv_rx.h"
  43 #include "fmdrv_tx.h"
  44
  45 /* Region info */
  46 static struct region_info region_configs[] = {
  47         /* Europe/US */
  48         {
  49          .chanl_space = FM_CHANNEL_SPACING_200KHZ * FM_FREQ_MUL,
  50          .bot_freq = 87500,     /* 87.5 MHz */
  51          .top_freq = 108000,    /* 108 MHz */
  52          .fm_band = 0,
  53          },
  54         /* Japan */
  55         {
  56          .chanl_space = FM_CHANNEL_SPACING_200KHZ * FM_FREQ_MUL,
  57          .bot_freq = 76000,     /* 76 MHz */
  58          .top_freq = 90000,     /* 90 MHz */
  59          .fm_band = 1,
  60          },
  61 };
  62
  63 /* Band selection */
  64 static u8 default_radio_region; /* Europe/US */
  65 module_param(default_radio_region, byte, 0);
  66 MODULE_PARM_DESC(default_radio_region, "Region: 0=Europe/US, 1=Japan");
  67
  68 /* RDS buffer blocks */
  69 static u32 default_rds_buf = 300;
  70 module_param(default_rds_buf, uint, 0444);
  71 MODULE_PARM_DESC(rds_buf, "RDS buffer entries");
  72
  73 /* Radio Nr */
  74 static u32 radio_nr = -1;
  75 module_param(radio_nr, int, 0444);
  76 MODULE_PARM_DESC(radio_nr, "Radio Nr");
  77
  78 /* FM irq handlers forward declaration */
  79 static void fm_irq_send_flag_getcmd(struct fmdev *);
  80 static void fm_irq_handle_flag_getcmd_resp(struct fmdev *);
  81 static void fm_irq_handle_hw_malfunction(struct fmdev *);
  82 static void fm_irq_handle_rds_start(struct fmdev *);
  83 static void fm_irq_send_rdsdata_getcmd(struct fmdev *);
  84 static void fm_irq_handle_rdsdata_getcmd_resp(struct fmdev *);
  85 static void fm_irq_handle_rds_finish(struct fmdev *);
  86 static void fm_irq_handle_tune_op_ended(struct fmdev *);
  87 static void fm_irq_handle_power_enb(struct fmdev *);
  88 static void fm_irq_handle_low_rssi_start(struct fmdev *);
  89 static void fm_irq_afjump_set_pi(struct fmdev *);
  90 static void fm_irq_handle_set_pi_resp(struct fmdev *);
  91 static void fm_irq_afjump_set_pimask(struct fmdev *);
  92 static void fm_irq_handle_set_pimask_resp(struct fmdev *);
  93 static void fm_irq_afjump_setfreq(struct fmdev *);
  94 static void fm_irq_handle_setfreq_resp(struct fmdev *);
  95 static void fm_irq_afjump_enableint(struct fmdev *);
  96 static void fm_irq_afjump_enableint_resp(struct fmdev *);
  97 static void fm_irq_start_afjump(struct fmdev *);
  98 static void fm_irq_handle_start_afjump_resp(struct fmdev *);
  99 static void fm_irq_afjump_rd_freq(struct fmdev *);
 100 static void fm_irq_afjump_rd_freq_resp(struct fmdev *);
 101 static void fm_irq_handle_low_rssi_finish(struct fmdev *);
 102 static void fm_irq_send_intmsk_cmd(struct fmdev *);
 103 static void fm_irq_handle_intmsk_cmd_resp(struct fmdev *);
 104
 105 /*
 106  * When FM common module receives interrupt packet, following handlers
 107  * will be executed one after another to service the interrupt(s)
 108  */
 109 enum fmc_irq_handler_index {
 110         FM_SEND_FLAG_GETCMD_IDX,
 111         FM_HANDLE_FLAG_GETCMD_RESP_IDX,
 112
 113         /* HW malfunction irq handler */
 114         FM_HW_MAL_FUNC_IDX,
 115
 116         /* RDS threshold reached irq handler */
 117         FM_RDS_START_IDX,
 118         FM_RDS_SEND_RDS_GETCMD_IDX,
 119         FM_RDS_HANDLE_RDS_GETCMD_RESP_IDX,
 120         FM_RDS_FINISH_IDX,
 121
 122         /* Tune operation ended irq handler */
 123         FM_HW_TUNE_OP_ENDED_IDX,
 124
 125         /* TX power enable irq handler */
 126         FM_HW_POWER_ENB_IDX,
 127
 128         /* Low RSSI irq handler */
 129         FM_LOW_RSSI_START_IDX,
 130         FM_AF_JUMP_SETPI_IDX,
 131         FM_AF_JUMP_HANDLE_SETPI_RESP_IDX,
 132         FM_AF_JUMP_SETPI_MASK_IDX,
 133         FM_AF_JUMP_HANDLE_SETPI_MASK_RESP_IDX,
 134         FM_AF_JUMP_SET_AF_FREQ_IDX,
 135         FM_AF_JUMP_HANDLE_SET_AFFREQ_RESP_IDX,
 136         FM_AF_JUMP_ENABLE_INT_IDX,
 137         FM_AF_JUMP_ENABLE_INT_RESP_IDX,
 138         FM_AF_JUMP_START_AFJUMP_IDX,
 139         FM_AF_JUMP_HANDLE_START_AFJUMP_RESP_IDX,
 140         FM_AF_JUMP_RD_FREQ_IDX,
 141         FM_AF_JUMP_RD_FREQ_RESP_IDX,
 142         FM_LOW_RSSI_FINISH_IDX,
 143
 144         /* Interrupt process post action */
 145         FM_SEND_INTMSK_CMD_IDX,
 146         FM_HANDLE_INTMSK_CMD_RESP_IDX,
 147 };
 148
 149 /* FM interrupt handler table */
 150 static int_handler_prototype int_handler_table[] = {
 151         fm_irq_send_flag_getcmd,
 152         fm_irq_handle_flag_getcmd_resp,
 153         fm_irq_handle_hw_malfunction,
 154         fm_irq_handle_rds_start, /* RDS threshold reached irq handler */
 155         fm_irq_send_rdsdata_getcmd,
 156         fm_irq_handle_rdsdata_getcmd_resp,
 157         fm_irq_handle_rds_finish,
 158         fm_irq_handle_tune_op_ended,
 159         fm_irq_handle_power_enb, /* TX power enable irq handler */
 160         fm_irq_handle_low_rssi_start,
 161         fm_irq_afjump_set_pi,
 162         fm_irq_handle_set_pi_resp,
 163         fm_irq_afjump_set_pimask,
 164         fm_irq_handle_set_pimask_resp,
 165         fm_irq_afjump_setfreq,
 166         fm_irq_handle_setfreq_resp,
 167         fm_irq_afjump_enableint,
 168         fm_irq_afjump_enableint_resp,
 169         fm_irq_start_afjump,
 170         fm_irq_handle_start_afjump_resp,
 171         fm_irq_afjump_rd_freq,
 172         fm_irq_afjump_rd_freq_resp,
 173         fm_irq_handle_low_rssi_finish,
 174         fm_irq_send_intmsk_cmd, /* Interrupt process post action */
 175         fm_irq_handle_intmsk_cmd_resp
 176 };
 177
 178 static long (*g_st_write) (struct sk_buff *skb);
 179 static struct completion wait_for_fmdrv_reg_comp;
 180
 181 static inline void fm_irq_call(struct fmdev *fmdev)
 182 {
 183         fmdev->irq_info.handlers[fmdev->irq_info.stage](fmdev);
 184 }
 185
 186 /* Continue next function in interrupt handler table */
 187 static inline void fm_irq_call_stage(struct fmdev *fmdev, u8 stage)
 188 {
 189         fmdev->irq_info.stage = stage;
 190         fm_irq_call(fmdev);
 191 }
 192
 193 static inline void fm_irq_timeout_stage(struct fmdev *fmdev, u8 stage)
 194 {
 195         fmdev->irq_info.stage = stage;
 196         mod_timer(&fmdev->irq_info.timer, jiffies + FM_DRV_TX_TIMEOUT);
 197 }
 198
 199 #ifdef FM_DUMP_TXRX_PKT
 200  /* To dump outgoing FM Channel-8 packets */
 201 inline void dump_tx_skb_data(struct sk_buff *skb)
 202 {
 203         int len, len_org;
 204         u8 index;
 205         struct fm_cmd_msg_hdr *cmd_hdr;
 206
 207         cmd_hdr = (struct fm_cmd_msg_hdr *)skb->data;
 208         printk(KERN_INFO "<<%shdr:%02x len:%02x opcode:%02x type:%s dlen:%02x",
 209                fm_cb(skb)->completion ? " " : "*", cmd_hdr->hdr,
 210                cmd_hdr->len, cmd_hdr->op,
 211                cmd_hdr->rd_wr ? "RD" : "WR", cmd_hdr->dlen);
 212
 213         len_org = skb->len - FM_CMD_MSG_HDR_SIZE;
 214         if (len_org > 0) {
 215                 printk("\n   data(%d): ", cmd_hdr->dlen);
 216                 len = min(len_org, 14);
 217                 for (index = 0; index < len; index++)
 218                         printk("%x ",
 219                                skb->data[FM_CMD_MSG_HDR_SIZE + index]);
 220                 printk("%s", (len_org > 14) ? ".." : "");
 221         }
 222         printk("\n");
 223 }
 224
 225  /* To dump incoming FM Channel-8 packets */
 226 inline void dump_rx_skb_data(struct sk_buff *skb)
 227 {
 228         int len, len_org;
 229         u8 index;
 230         struct fm_event_msg_hdr *evt_hdr;
 231
 232         evt_hdr = (struct fm_event_msg_hdr *)skb->data;
 233         printk(KERN_INFO ">> hdr:%02x len:%02x sts:%02x numhci:%02x "
 234             "opcode:%02x type:%s dlen:%02x", evt_hdr->hdr, evt_hdr->len,
 235             evt_hdr->status, evt_hdr->num_fm_hci_cmds, evt_hdr->op,
 236             (evt_hdr->rd_wr) ? "RD" : "WR", evt_hdr->dlen);
 237
 238         len_org = skb->len - FM_EVT_MSG_HDR_SIZE;
 239         if (len_org > 0) {
 240                 printk("\n   data(%d): ", evt_hdr->dlen);
 241                 len = min(len_org, 14);
 242                 for (index = 0; index < len; index++)
 243                         printk("%x ",
 244                                skb->data[FM_EVT_MSG_HDR_SIZE + index]);
 245                 printk("%s", (len_org > 14) ? ".." : "");
 246         }
 247         printk("\n");
 248 }
 249 #endif
 250
 251 void fmc_update_region_info(struct fmdev *fmdev, u8 region_to_set)
 252 {
 253         fmdev->rx.region = region_configs[region_to_set];
 254 }
 255
 256 /*
 257  * FM common sub-module will schedule this tasklet whenever it receives
 258  * FM packet from ST driver.
 259  */
 260 static void recv_tasklet(unsigned long arg)
 261 {
 262         struct fmdev *fmdev;
 263         struct fm_irq *irq_info;
 264         struct fm_event_msg_hdr *evt_hdr;
 265         struct sk_buff *skb;
 266         u8 num_fm_hci_cmds;
 267         unsigned long flags;
 268
 269         fmdev = (struct fmdev *)arg;
 270         irq_info = &fmdev->irq_info;
 271         /* Process all packets in the RX queue */
 272         while ((skb = skb_dequeue(&fmdev->rx_q))) {
 273                 if (skb->len < sizeof(struct fm_event_msg_hdr)) {
 274                         fmerr("skb(%p) has only %d bytes, "
 275                                 "at least need %zu bytes to decode\n", skb,
 276                                 skb->len, sizeof(struct fm_event_msg_hdr));
 277                         kfree_skb(skb);
 278                         continue;
 279                 }
 280
 281                 evt_hdr = (void *)skb->data;
 282                 num_fm_hci_cmds = evt_hdr->num_fm_hci_cmds;
 283
 284                 /* FM interrupt packet? */
 285                 if (evt_hdr->op == FM_INTERRUPT) {
 286                         /* FM interrupt handler started already? */
 287                         if (!test_bit(FM_INTTASK_RUNNING, &fmdev->flag)) {
 288                                 set_bit(FM_INTTASK_RUNNING, &fmdev->flag);
 289                                 if (irq_info->stage != 0) {
 290                                         fmerr("Inval stage resetting to zero\n");
 291                                         irq_info->stage = 0;
 292                                 }
 293
 294                                 /*
 295                                  * Execute first function in interrupt handler
 296                                  * table.
 297                                  */
 298                                 irq_info->handlers[irq_info->stage](fmdev);
 299                         } else {
 300                                 set_bit(FM_INTTASK_SCHEDULE_PENDING, &fmdev->flag);
 301                         }
 302                         kfree_skb(skb);
 303                 }
 304                 /* Anyone waiting for this with completion handler? */
 305                 else if (evt_hdr->op == fmdev->pre_op && fmdev->resp_comp != NULL) {
 306
 307                         spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
 308                         fmdev->resp_skb = skb;
 309                         spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
 310                         complete(fmdev->resp_comp);
 311
 312                         fmdev->resp_comp = NULL;
 313                         atomic_set(&fmdev->tx_cnt, 1);
 314                 }
 315                 /* Is this for interrupt handler? */
 316                 else if (evt_hdr->op == fmdev->pre_op && fmdev->resp_comp == NULL) {
 317                         if (fmdev->resp_skb != NULL)
 318                                 fmerr("Response SKB ptr not NULL\n");
 319
 320                         spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
 321                         fmdev->resp_skb = skb;
 322                         spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
 323
 324                         /* Execute interrupt handler where state index points */
 325                         irq_info->handlers[irq_info->stage](fmdev);
 326
 327                         kfree_skb(skb);
 328                         atomic_set(&fmdev->tx_cnt, 1);
 329                 } else {
 330                         fmerr("Nobody claimed SKB(%p),purging\n", skb);
 331                 }
 332
 333                 /*
 334                  * Check flow control field. If Num_FM_HCI_Commands field is
 335                  * not zero, schedule FM TX tasklet.
 336                  */
 337                 if (num_fm_hci_cmds && atomic_read(&fmdev->tx_cnt))
 338                         if (!skb_queue_empty(&fmdev->tx_q))
 339                                 tasklet_schedule(&fmdev->tx_task);
 340         }
 341 }
 342
 343 /* FM send tasklet: is scheduled when FM packet has to be sent to chip */
 344 static void send_tasklet(unsigned long arg)
 345 {
 346         struct fmdev *fmdev;
 347         struct sk_buff *skb;
 348         int len;
 349
 350         fmdev = (struct fmdev *)arg;
 351
 352         if (!atomic_read(&fmdev->tx_cnt))
 353                 return;
 354
 355         /* Check, is there any timeout happened to last transmitted packet */
 356         if ((jiffies - fmdev->last_tx_jiffies) > FM_DRV_TX_TIMEOUT) {
 357                 fmerr("TX timeout occurred\n");
 358                 atomic_set(&fmdev->tx_cnt, 1);
 359         }
 360
 361         /* Send queued FM TX packets */
 362         skb = skb_dequeue(&fmdev->tx_q);
 363         if (!skb)
 364                 return;
 365
 366         atomic_dec(&fmdev->tx_cnt);
 367         fmdev->pre_op = fm_cb(skb)->fm_op;
 368
 369         if (fmdev->resp_comp != NULL)
 370                 fmerr("Response completion handler is not NULL\n");
 371
 372         fmdev->resp_comp = fm_cb(skb)->completion;
 373
 374         /* Write FM packet to ST driver */
 375         len = g_st_write(skb);
 376         if (len < 0) {
 377                 kfree_skb(skb);
 378                 fmdev->resp_comp = NULL;
 379                 fmerr("TX tasklet failed to send skb(%p)\n", skb);
 380                 atomic_set(&fmdev->tx_cnt, 1);
 381         } else {
 382                 fmdev->last_tx_jiffies = jiffies;
 383         }
 384 }
 385
 386 /*
 387  * Queues FM Channel-8 packet to FM TX queue and schedules FM TX tasklet for
 388  * transmission
 389  */
 390 static int fm_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
 391                 int payload_len, struct completion *wait_completion)
 392 {
 393         struct sk_buff *skb;
 394         struct fm_cmd_msg_hdr *hdr;
 395         int size;
 396
 397         if (fm_op >= FM_INTERRUPT) {
 398                 fmerr("Invalid fm opcode - %d\n", fm_op);
 399                 return -EINVAL;
 400         }
 401         if (test_bit(FM_FW_DW_INPROGRESS, &fmdev->flag) && payload == NULL) {
 402                 fmerr("Payload data is NULL during fw download\n");
 403                 return -EINVAL;
 404         }
 405         if (!test_bit(FM_FW_DW_INPROGRESS, &fmdev->flag))
 406                 size =
 407                     FM_CMD_MSG_HDR_SIZE + ((payload == NULL) ? 0 : payload_len);
 408         else
 409                 size = payload_len;
 410
 411         skb = alloc_skb(size, GFP_ATOMIC);
 412         if (!skb) {
 413                 fmerr("No memory to create new SKB\n");
 414                 return -ENOMEM;
 415         }
 416         /*
 417          * Don't fill FM header info for the commands which come from
 418          * FM firmware file.
 419          */
 420         if (!test_bit(FM_FW_DW_INPROGRESS, &fmdev->flag) ||
 421                         test_bit(FM_INTTASK_RUNNING, &fmdev->flag)) {
 422                 /* Fill command header info */
 423                 hdr = (struct fm_cmd_msg_hdr *)skb_put(skb, FM_CMD_MSG_HDR_SIZE);
 424                 hdr->hdr = FM_PKT_LOGICAL_CHAN_NUMBER;  /* 0x08 */
 425
 426                 /* 3 (fm_opcode,rd_wr,dlen) + payload len) */
 427                 hdr->len = ((payload == NULL) ? 0 : payload_len) + 3;
 428
 429                 /* FM opcode */
 430                 hdr->op = fm_op;
 431
 432                 /* read/write type */
 433                 hdr->rd_wr = type;
 434                 hdr->dlen = payload_len;
 435                 fm_cb(skb)->fm_op = fm_op;
 436
 437                 /*
 438                  * If firmware download has finished and the command is
 439                  * not a read command then payload is != NULL - a write
 440                  * command with u16 payload - convert to be16
 441                  */
 442                 if (payload != NULL)
 443                         *(__be16 *)payload = cpu_to_be16(*(u16 *)payload);
 444
 445         } else if (payload != NULL) {
 446                 fm_cb(skb)->fm_op = *((u8 *)payload + 2);
 447         }
 448         if (payload != NULL)
 449                 memcpy(skb_put(skb, payload_len), payload, payload_len);
 450
 451         fm_cb(skb)->completion = wait_completion;
 452         skb_queue_tail(&fmdev->tx_q, skb);
 453         tasklet_schedule(&fmdev->tx_task);
 454
 455         return 0;
 456 }
 457
 458 /* Sends FM Channel-8 command to the chip and waits for the response */
 459 int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
 460                 unsigned int payload_len, void *response, int *response_len)
 461 {
 462         struct sk_buff *skb;
 463         struct fm_event_msg_hdr *evt_hdr;
 464         unsigned long flags;
 465         int ret;
 466
 467         init_completion(&fmdev->maintask_comp);
 468         ret = fm_send_cmd(fmdev, fm_op, type, payload, payload_len,
 469                             &fmdev->maintask_comp);
 470         if (ret)
 471                 return ret;
 472
 473         if (!wait_for_completion_timeout(&fmdev->maintask_comp,
 474                                          FM_DRV_TX_TIMEOUT)) {
 475                 fmerr("Timeout(%d sec),didn't get reg"
 476                            "completion signal from RX tasklet\n",
 477                            jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
 478                 return -ETIMEDOUT;
 479         }
 480         if (!fmdev->resp_skb) {
 481                 fmerr("Response SKB is missing\n");
 482                 return -EFAULT;
 483         }
 484         spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
 485         skb = fmdev->resp_skb;
 486         fmdev->resp_skb = NULL;
 487         spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
 488
 489         evt_hdr = (void *)skb->data;
 490         if (evt_hdr->status != 0) {
 491                 fmerr("Received event pkt status(%d) is not zero\n",
 492                            evt_hdr->status);
 493                 kfree_skb(skb);
 494                 return -EIO;
 495         }
 496         /* Send response data to caller */
 497         if (response != NULL && response_len != NULL && evt_hdr->dlen) {
 498                 /* Skip header info and copy only response data */
 499                 skb_pull(skb, sizeof(struct fm_event_msg_hdr));
 500                 memcpy(response, skb->data, evt_hdr->dlen);
 501                 *response_len = evt_hdr->dlen;
 502         } else if (response_len != NULL && evt_hdr->dlen == 0) {
 503                 *response_len = 0;
 504         }
 505         kfree_skb(skb);
 506
 507         return 0;
 508 }
 509
 510 /* --- Helper functions used in FM interrupt handlers ---*/
 511 static inline int check_cmdresp_status(struct fmdev *fmdev,
 512                 struct sk_buff **skb)
 513 {
 514         struct fm_event_msg_hdr *fm_evt_hdr;
 515         unsigned long flags;
 516
 517         del_timer(&fmdev->irq_info.timer);
 518
 519         spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
 520         *skb = fmdev->resp_skb;
 521         fmdev->resp_skb = NULL;
 522         spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
 523
 524         fm_evt_hdr = (void *)(*skb)->data;
 525         if (fm_evt_hdr->status != 0) {
 526                 fmerr("irq: opcode %x response status is not zero "
 527                                 "Initiating irq recovery process\n",
 528                                 fm_evt_hdr->op);
 529
 530                 mod_timer(&fmdev->irq_info.timer, jiffies + FM_DRV_TX_TIMEOUT);
 531                 return -1;
 532         }
 533
 534         return 0;
 535 }
 536
 537 static inline void fm_irq_common_cmd_resp_helper(struct fmdev *fmdev, u8 stage)
 538 {
 539         struct sk_buff *skb;
 540
 541         if (!check_cmdresp_status(fmdev, &skb))
 542                 fm_irq_call_stage(fmdev, stage);
 543 }
 544
 545 /*
 546  * Interrupt process timeout handler.
 547  * One of the irq handler did not get proper response from the chip. So take
 548  * recovery action here. FM interrupts are disabled in the beginning of
 549  * interrupt process. Therefore reset stage index to re-enable default
 550  * interrupts. So that next interrupt will be processed as usual.
 551  */
 552 static void int_timeout_handler(unsigned long data)
 553 {
 554         struct fmdev *fmdev;
 555         struct fm_irq *fmirq;
 556
 557         fmdbg("irq: timeout,trying to re-enable fm interrupts\n");
 558         fmdev = (struct fmdev *)data;
 559         fmirq = &fmdev->irq_info;
 560         fmirq->retry++;
 561
 562         if (fmirq->retry > FM_IRQ_TIMEOUT_RETRY_MAX) {
 563                 /* Stop recovery action (interrupt reenable process) and
 564                  * reset stage index & retry count values */
 565                 fmirq->stage = 0;
 566                 fmirq->retry = 0;
 567                 fmerr("Recovery action failed during"
 568                                 "irq processing, max retry reached\n");
 569                 return;
 570         }
 571         fm_irq_call_stage(fmdev, FM_SEND_INTMSK_CMD_IDX);
 572 }
 573
 574 /* --------- FM interrupt handlers ------------*/
 575 static void fm_irq_send_flag_getcmd(struct fmdev *fmdev)
 576 {
 577         u16 flag;
 578
 579         /* Send FLAG_GET command , to know the source of interrupt */
 580         if (!fm_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, sizeof(flag), NULL))
 581                 fm_irq_timeout_stage(fmdev, FM_HANDLE_FLAG_GETCMD_RESP_IDX);
 582 }
 583
 584 static void fm_irq_handle_flag_getcmd_resp(struct fmdev *fmdev)
 585 {
 586         struct sk_buff *skb;
 587         struct fm_event_msg_hdr *fm_evt_hdr;
 588
 589         if (check_cmdresp_status(fmdev, &skb))
 590                 return;
 591
 592         fm_evt_hdr = (void *)skb->data;
 593
 594         /* Skip header info and copy only response data */
 595         skb_pull(skb, sizeof(struct fm_event_msg_hdr));
 596         memcpy(&fmdev->irq_info.flag, skb->data, fm_evt_hdr->dlen);
 597
 598         fmdev->irq_info.flag = be16_to_cpu((__force __be16)fmdev->irq_info.flag);
 599         fmdbg("irq: flag register(0x%x)\n", fmdev->irq_info.flag);
 600
 601         /* Continue next function in interrupt handler table */
 602         fm_irq_call_stage(fmdev, FM_HW_MAL_FUNC_IDX);
 603 }
 604
 605 static void fm_irq_handle_hw_malfunction(struct fmdev *fmdev)
 606 {
 607         if (fmdev->irq_info.flag & FM_MAL_EVENT & fmdev->irq_info.mask)
 608                 fmerr("irq: HW MAL int received - do nothing\n");
 609
 610         /* Continue next function in interrupt handler table */
 611         fm_irq_call_stage(fmdev, FM_RDS_START_IDX);
 612 }
 613
 614 static void fm_irq_handle_rds_start(struct fmdev *fmdev)
 615 {
 616         if (fmdev->irq_info.flag & FM_RDS_EVENT & fmdev->irq_info.mask) {
 617                 fmdbg("irq: rds threshold reached\n");
 618                 fmdev->irq_info.stage = FM_RDS_SEND_RDS_GETCMD_IDX;
 619         } else {
 620                 /* Continue next function in interrupt handler table */
 621                 fmdev->irq_info.stage = FM_HW_TUNE_OP_ENDED_IDX;
 622         }
 623
 624         fm_irq_call(fmdev);
 625 }
 626
 627 static void fm_irq_send_rdsdata_getcmd(struct fmdev *fmdev)
 628 {
 629         /* Send the command to read RDS data from the chip */
 630         if (!fm_send_cmd(fmdev, RDS_DATA_GET, REG_RD, NULL,
 631                             (FM_RX_RDS_FIFO_THRESHOLD * 3), NULL))
 632                 fm_irq_timeout_stage(fmdev, FM_RDS_HANDLE_RDS_GETCMD_RESP_IDX);
 633 }
 634
 635 /* Keeps track of current RX channel AF (Alternate Frequency) */
 636 static void fm_rx_update_af_cache(struct fmdev *fmdev, u8 af)
 637 {
 638         struct tuned_station_info *stat_info = &fmdev->rx.stat_info;
 639         u8 reg_idx = fmdev->rx.region.fm_band;
 640         u8 index;
 641         u32 freq;
 642
 643         /* First AF indicates the number of AF follows. Reset the list */
 644         if ((af >= FM_RDS_1_AF_FOLLOWS) && (af <= FM_RDS_25_AF_FOLLOWS)) {
 645                 fmdev->rx.stat_info.af_list_max = (af - FM_RDS_1_AF_FOLLOWS + 1);
 646                 fmdev->rx.stat_info.afcache_size = 0;
 647                 fmdbg("No of expected AF : %d\n", fmdev->rx.stat_info.af_list_max);
 648                 return;
 649         }
 650
 651         if (af < FM_RDS_MIN_AF)
 652                 return;
 653         if (reg_idx == FM_BAND_EUROPE_US && af > FM_RDS_MAX_AF)
 654                 return;
 655         if (reg_idx == FM_BAND_JAPAN && af > FM_RDS_MAX_AF_JAPAN)
 656                 return;
 657
 658         freq = fmdev->rx.region.bot_freq + (af * 100);
 659         if (freq == fmdev->rx.freq) {
 660                 fmdbg("Current freq(%d) is matching with received AF(%d)\n",
 661                                 fmdev->rx.freq, freq);
 662                 return;
 663         }
 664         /* Do check in AF cache */
 665         for (index = 0; index < stat_info->afcache_size; index++) {
 666                 if (stat_info->af_cache[index] == freq)
 667                         break;
 668         }
 669         /* Reached the limit of the list - ignore the next AF */
 670         if (index == stat_info->af_list_max) {
 671                 fmdbg("AF cache is full\n");
 672                 return;
 673         }
 674         /*
 675          * If we reached the end of the list then this AF is not
 676          * in the list - add it.
 677          */
 678         if (index == stat_info->afcache_size) {
 679                 fmdbg("Storing AF %d to cache index %d\n", freq, index);
 680                 stat_info->af_cache[index] = freq;
 681                 stat_info->afcache_size++;
 682         }
 683 }
 684
 685 /*
 686  * Converts RDS buffer data from big endian format
 687  * to little endian format.
 688  */
 689 static void fm_rdsparse_swapbytes(struct fmdev *fmdev,
 690                 struct fm_rdsdata_format *rds_format)
 691 {
 692         u8 index = 0;
 693         u8 *rds_buff;
 694
 695         /*
 696          * Since in Orca the 2 RDS Data bytes are in little endian and
 697          * in Dolphin they are in big endian, the parsing of the RDS data
 698          * is chip dependent
 699          */
 700         if (fmdev->asci_id != 0x6350) {
 701                 rds_buff = &rds_format->data.groupdatabuff.buff[0];
 702                 while (index + 1 < FM_RX_RDS_INFO_FIELD_MAX) {
 703                         swap(rds_buff[index], rds_buff[index + 1]);
 704                         index += 2;
 705                 }
 706         }
 707 }
 708
 709 static void fm_irq_handle_rdsdata_getcmd_resp(struct fmdev *fmdev)
 710 {
 711         struct sk_buff *skb;
 712         struct fm_rdsdata_format rds_fmt;
 713         struct fm_rds *rds = &fmdev->rx.rds;
 714         unsigned long group_idx, flags;
 715         u8 *rds_data, meta_data, tmpbuf[FM_RDS_BLK_SIZE];
 716         u8 type, blk_idx;
 717         u16 cur_picode;
 718         u32 rds_len;
 719
 720         if (check_cmdresp_status(fmdev, &skb))
 721                 return;
 722
 723         /* Skip header info */
 724         skb_pull(skb, sizeof(struct fm_event_msg_hdr));
 725         rds_data = skb->data;
 726         rds_len = skb->len;
 727
 728         /* Parse the RDS data */
 729         while (rds_len >= FM_RDS_BLK_SIZE) {
 730                 meta_data = rds_data[2];
 731                 /* Get the type: 0=A, 1=B, 2=C, 3=C', 4=D, 5=E */
 732                 type = (meta_data & 0x07);
 733
 734                 /* Transform the blk type into index sequence (0, 1, 2, 3, 4) */
 735                 blk_idx = (type <= FM_RDS_BLOCK_C ? type : (type - 1));
 736                 fmdbg("Block index:%d(%s)\n", blk_idx,
 737                            (meta_data & FM_RDS_STATUS_ERR_MASK) ? "Bad" : "Ok");
 738
 739                 if ((meta_data & FM_RDS_STATUS_ERR_MASK) != 0)
 740                         break;
 741
 742                 if (blk_idx > FM_RDS_BLK_IDX_D) {
 743                         fmdbg("Block sequence mismatch\n");
 744                         rds->last_blk_idx = -1;
 745                         break;
 746                 }
 747
 748                 /* Skip checkword (control) byte and copy only data byte */
 749                 memcpy(&rds_fmt.data.groupdatabuff.
 750                                 buff[blk_idx * (FM_RDS_BLK_SIZE - 1)],
 751                                 rds_data, (FM_RDS_BLK_SIZE - 1));
 752
 753                 rds->last_blk_idx = blk_idx;
 754
 755                 /* If completed a whole group then handle it */
 756                 if (blk_idx == FM_RDS_BLK_IDX_D) {
 757                         fmdbg("Good block received\n");
 758                         fm_rdsparse_swapbytes(fmdev, &rds_fmt);
 759
 760                         /*
 761                          * Extract PI code and store in local cache.
 762                          * We need this during AF switch processing.
 763                          */
 764                         cur_picode = be16_to_cpu((__force __be16)rds_fmt.data.groupgeneral.pidata);
 765                         if (fmdev->rx.stat_info.picode != cur_picode)
 766                                 fmdev->rx.stat_info.picode = cur_picode;
 767
 768                         fmdbg("picode:%d\n", cur_picode);
 769
 770                         group_idx = (rds_fmt.data.groupgeneral.blk_b[0] >> 3);
 771                         fmdbg("(fmdrv):Group:%ld%s\n", group_idx/2,
 772                                         (group_idx % 2) ? "B" : "A");
 773
 774                         group_idx = 1 << (rds_fmt.data.groupgeneral.blk_b[0] >> 3);
 775                         if (group_idx == FM_RDS_GROUP_TYPE_MASK_0A) {
 776                                 fm_rx_update_af_cache(fmdev, rds_fmt.data.group0A.af[0]);
 777                                 fm_rx_update_af_cache(fmdev, rds_fmt.data.group0A.af[1]);
 778                         }
 779                 }
 780                 rds_len -= FM_RDS_BLK_SIZE;
 781                 rds_data += FM_RDS_BLK_SIZE;
 782         }
 783
 784         /* Copy raw rds data to internal rds buffer */
 785         rds_data = skb->data;
 786         rds_len = skb->len;
 787
 788         spin_lock_irqsave(&fmdev->rds_buff_lock, flags);
 789         while (rds_len > 0) {
 790                 /*
 791                  * Fill RDS buffer as per V4L2 specification.
 792                  * Store control byte
 793                  */
 794                 type = (rds_data[2] & 0x07);
 795                 blk_idx = (type <= FM_RDS_BLOCK_C ? type : (type - 1));
 796                 tmpbuf[2] = blk_idx;    /* Offset name */
 797                 tmpbuf[2] |= blk_idx << 3;      /* Received offset */
 798
 799                 /* Store data byte */
 800                 tmpbuf[0] = rds_data[0];
 801                 tmpbuf[1] = rds_data[1];
 802
 803                 memcpy(&rds->buff[rds->wr_idx], &tmpbuf, FM_RDS_BLK_SIZE);
 804                 rds->wr_idx = (rds->wr_idx + FM_RDS_BLK_SIZE) % rds->buf_size;
 805
 806                 /* Check for overflow & start over */
 807                 if (rds->wr_idx == rds->rd_idx) {
 808                         fmdbg("RDS buffer overflow\n");
 809                         rds->wr_idx = 0;
 810                         rds->rd_idx = 0;
 811                         break;
 812                 }
 813                 rds_len -= FM_RDS_BLK_SIZE;
 814                 rds_data += FM_RDS_BLK_SIZE;
 815         }
 816         spin_unlock_irqrestore(&fmdev->rds_buff_lock, flags);
 817
 818         /* Wakeup read queue */
 819         if (rds->wr_idx != rds->rd_idx)
 820                 wake_up_interruptible(&rds->read_queue);
 821
 822         fm_irq_call_stage(fmdev, FM_RDS_FINISH_IDX);
 823 }
 824
 825 static void fm_irq_handle_rds_finish(struct fmdev *fmdev)
 826 {
 827         fm_irq_call_stage(fmdev, FM_HW_TUNE_OP_ENDED_IDX);
 828 }
 829
 830 static void fm_irq_handle_tune_op_ended(struct fmdev *fmdev)
 831 {
 832         if (fmdev->irq_info.flag & (FM_FR_EVENT | FM_BL_EVENT) & fmdev->
 833             irq_info.mask) {
 834                 fmdbg("irq: tune ended/bandlimit reached\n");
 835                 if (test_and_clear_bit(FM_AF_SWITCH_INPROGRESS, &fmdev->flag)) {
 836                         fmdev->irq_info.stage = FM_AF_JUMP_RD_FREQ_IDX;
 837                 } else {
 838                         complete(&fmdev->maintask_comp);
 839                         fmdev->irq_info.stage = FM_HW_POWER_ENB_IDX;
 840                 }
 841         } else
 842                 fmdev->irq_info.stage = FM_HW_POWER_ENB_IDX;
 843
 844         fm_irq_call(fmdev);
 845 }
 846
 847 static void fm_irq_handle_power_enb(struct fmdev *fmdev)
 848 {
 849         if (fmdev->irq_info.flag & FM_POW_ENB_EVENT) {
 850                 fmdbg("irq: Power Enabled/Disabled\n");
 851                 complete(&fmdev->maintask_comp);
 852         }
 853
 854         fm_irq_call_stage(fmdev, FM_LOW_RSSI_START_IDX);
 855 }
 856
 857 static void fm_irq_handle_low_rssi_start(struct fmdev *fmdev)
 858 {
 859         if ((fmdev->rx.af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON) &&
 860             (fmdev->irq_info.flag & FM_LEV_EVENT & fmdev->irq_info.mask) &&
 861             (fmdev->rx.freq != FM_UNDEFINED_FREQ) &&
 862             (fmdev->rx.stat_info.afcache_size != 0)) {
 863                 fmdbg("irq: rssi level has fallen below threshold level\n");
 864
 865                 /* Disable further low RSSI interrupts */
 866                 fmdev->irq_info.mask &= ~FM_LEV_EVENT;
 867
 868                 fmdev->rx.afjump_idx = 0;
 869                 fmdev->rx.freq_before_jump = fmdev->rx.freq;
 870                 fmdev->irq_info.stage = FM_AF_JUMP_SETPI_IDX;
 871         } else {
 872                 /* Continue next function in interrupt handler table */
 873                 fmdev->irq_info.stage = FM_SEND_INTMSK_CMD_IDX;
 874         }
 875
 876         fm_irq_call(fmdev);
 877 }
 878
 879 static void fm_irq_afjump_set_pi(struct fmdev *fmdev)
 880 {
 881         u16 payload;
 882
 883         /* Set PI code - must be updated if the AF list is not empty */
 884         payload = fmdev->rx.stat_info.picode;
 885         if (!fm_send_cmd(fmdev, RDS_PI_SET, REG_WR, &payload, sizeof(payload), NULL))
 886                 fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_SETPI_RESP_IDX);
 887 }
 888
 889 static void fm_irq_handle_set_pi_resp(struct fmdev *fmdev)
 890 {
 891         fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_SETPI_MASK_IDX);
 892 }
 893
 894 /*
 895  * Set PI mask.
 896  * 0xFFFF = Enable PI code matching
 897  * 0x0000 = Disable PI code matching
 898  */
 899 static void fm_irq_afjump_set_pimask(struct fmdev *fmdev)
 900 {
 901         u16 payload;
 902
 903         payload = 0x0000;
 904         if (!fm_send_cmd(fmdev, RDS_PI_MASK_SET, REG_WR, &payload, sizeof(payload), NULL))
 905                 fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_SETPI_MASK_RESP_IDX);
 906 }
 907
 908 static void fm_irq_handle_set_pimask_resp(struct fmdev *fmdev)
 909 {
 910         fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_SET_AF_FREQ_IDX);
 911 }
 912
 913 static void fm_irq_afjump_setfreq(struct fmdev *fmdev)
 914 {
 915         u16 frq_index;
 916         u16 payload;
 917
 918         fmdbg("Swtich to %d KHz\n", fmdev->rx.stat_info.af_cache[fmdev->rx.afjump_idx]);
 919         frq_index = (fmdev->rx.stat_info.af_cache[fmdev->rx.afjump_idx] -
 920              fmdev->rx.region.bot_freq) / FM_FREQ_MUL;
 921
 922         payload = frq_index;
 923         if (!fm_send_cmd(fmdev, AF_FREQ_SET, REG_WR, &payload, sizeof(payload), NULL))
 924                 fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_SET_AFFREQ_RESP_IDX);
 925 }
 926
 927 static void fm_irq_handle_setfreq_resp(struct fmdev *fmdev)
 928 {
 929         fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_ENABLE_INT_IDX);
 930 }
 931
 932 static void fm_irq_afjump_enableint(struct fmdev *fmdev)
 933 {
 934         u16 payload;
 935
 936         /* Enable FR (tuning operation ended) interrupt */
 937         payload = FM_FR_EVENT;
 938         if (!fm_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload, sizeof(payload), NULL))
 939                 fm_irq_timeout_stage(fmdev, FM_AF_JUMP_ENABLE_INT_RESP_IDX);
 940 }
 941
 942 static void fm_irq_afjump_enableint_resp(struct fmdev *fmdev)
 943 {
 944         fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_START_AFJUMP_IDX);
 945 }
 946
 947 static void fm_irq_start_afjump(struct fmdev *fmdev)
 948 {
 949         u16 payload;
 950
 951         payload = FM_TUNER_AF_JUMP_MODE;
 952         if (!fm_send_cmd(fmdev, TUNER_MODE_SET, REG_WR, &payload,
 953                         sizeof(payload), NULL))
 954                 fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_START_AFJUMP_RESP_IDX);
 955 }
 956
 957 static void fm_irq_handle_start_afjump_resp(struct fmdev *fmdev)
 958 {
 959         struct sk_buff *skb;
 960
 961         if (check_cmdresp_status(fmdev, &skb))
 962                 return;
 963
 964         fmdev->irq_info.stage = FM_SEND_FLAG_GETCMD_IDX;
 965         set_bit(FM_AF_SWITCH_INPROGRESS, &fmdev->flag);
 966         clear_bit(FM_INTTASK_RUNNING, &fmdev->flag);
 967 }
 968
 969 static void fm_irq_afjump_rd_freq(struct fmdev *fmdev)
 970 {
 971         u16 payload;
 972
 973         if (!fm_send_cmd(fmdev, FREQ_SET, REG_RD, NULL, sizeof(payload), NULL))
 974                 fm_irq_timeout_stage(fmdev, FM_AF_JUMP_RD_FREQ_RESP_IDX);
 975 }
 976
 977 static void fm_irq_afjump_rd_freq_resp(struct fmdev *fmdev)
 978 {
 979         struct sk_buff *skb;
 980         u16 read_freq;
 981         u32 curr_freq, jumped_freq;
 982
 983         if (check_cmdresp_status(fmdev, &skb))
 984                 return;
 985
 986         /* Skip header info and copy only response data */
 987         skb_pull(skb, sizeof(struct fm_event_msg_hdr));
 988         memcpy(&read_freq, skb->data, sizeof(read_freq));
 989         read_freq = be16_to_cpu((__force __be16)read_freq);
 990         curr_freq = fmdev->rx.region.bot_freq + ((u32)read_freq * FM_FREQ_MUL);
 991
 992         jumped_freq = fmdev->rx.stat_info.af_cache[fmdev->rx.afjump_idx];
 993
 994         /* If the frequency was changed the jump succeeded */
 995         if ((curr_freq != fmdev->rx.freq_before_jump) && (curr_freq == jumped_freq)) {
 996                 fmdbg("Successfully switched to alternate freq %d\n", curr_freq);
 997                 fmdev->rx.freq = curr_freq;
 998                 fm_rx_reset_rds_cache(fmdev);
 999
1000                 /* AF feature is on, enable low level RSSI interrupt */
1001                 if (fmdev->rx.af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON)
1002                         fmdev->irq_info.mask |= FM_LEV_EVENT;
1003
1004                 fmdev->irq_info.stage = FM_LOW_RSSI_FINISH_IDX;
1005         } else {                /* jump to the next freq in the AF list */
1006                 fmdev->rx.afjump_idx++;
1007
1008                 /* If we reached the end of the list - stop searching */
1009                 if (fmdev->rx.afjump_idx >= fmdev->rx.stat_info.afcache_size) {
1010                         fmdbg("AF switch processing failed\n");
1011                         fmdev->irq_info.stage = FM_LOW_RSSI_FINISH_IDX;
1012                 } else {        /* AF List is not over - try next one */
1013
1014                         fmdbg("Trying next freq in AF cache\n");
1015                         fmdev->irq_info.stage = FM_AF_JUMP_SETPI_IDX;
1016                 }
1017         }
1018         fm_irq_call(fmdev);
1019 }
1020
1021 static void fm_irq_handle_low_rssi_finish(struct fmdev *fmdev)
1022 {
1023         fm_irq_call_stage(fmdev, FM_SEND_INTMSK_CMD_IDX);
1024 }
1025
1026 static void fm_irq_send_intmsk_cmd(struct fmdev *fmdev)
1027 {
1028         u16 payload;
1029
1030         /* Re-enable FM interrupts */
1031         payload = fmdev->irq_info.mask;
1032
1033         if (!fm_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
1034                         sizeof(payload), NULL))
1035                 fm_irq_timeout_stage(fmdev, FM_HANDLE_INTMSK_CMD_RESP_IDX);
1036 }
1037
1038 static void fm_irq_handle_intmsk_cmd_resp(struct fmdev *fmdev)
1039 {
1040         struct sk_buff *skb;
1041
1042         if (check_cmdresp_status(fmdev, &skb))
1043                 return;
1044         /*
1045          * This is last function in interrupt table to be executed.
1046          * So, reset stage index to 0.
1047          */
1048         fmdev->irq_info.stage = FM_SEND_FLAG_GETCMD_IDX;
1049
1050         /* Start processing any pending interrupt */
1051         if (test_and_clear_bit(FM_INTTASK_SCHEDULE_PENDING, &fmdev->flag))
1052                 fmdev->irq_info.handlers[fmdev->irq_info.stage](fmdev);
1053         else
1054                 clear_bit(FM_INTTASK_RUNNING, &fmdev->flag);
1055 }
1056
1057 /* Returns availability of RDS data in internel buffer */
1058 int fmc_is_rds_data_available(struct fmdev *fmdev, struct file *file,
1059                                 struct poll_table_struct *pts)
1060 {
1061         poll_wait(file, &fmdev->rx.rds.read_queue, pts);
1062         if (fmdev->rx.rds.rd_idx != fmdev->rx.rds.wr_idx)
1063                 return 0;
1064
1065         return -EAGAIN;
1066 }
1067
1068 /* Copies RDS data from internal buffer to user buffer */
1069 int fmc_transfer_rds_from_internal_buff(struct fmdev *fmdev, struct file *file,
1070                 u8 __user *buf, size_t count)
1071 {
1072         u32 block_count;
1073         u8 tmpbuf[FM_RDS_BLK_SIZE];
1074         unsigned long flags;
1075         int ret;
1076
1077         if (fmdev->rx.rds.wr_idx == fmdev->rx.rds.rd_idx) {
1078                 if (file->f_flags & O_NONBLOCK)
1079                         return -EWOULDBLOCK;
1080
1081                 ret = wait_event_interruptible(fmdev->rx.rds.read_queue,
1082                                 (fmdev->rx.rds.wr_idx != fmdev->rx.rds.rd_idx));
1083                 if (ret)
1084                         return -EINTR;
1085         }
1086
1087         /* Calculate block count from byte count */
1088         count /= FM_RDS_BLK_SIZE;
1089         block_count = 0;
1090         ret = 0;
1091
1092         while (block_count < count) {
1093                 spin_lock_irqsave(&fmdev->rds_buff_lock, flags);
1094
1095                 if (fmdev->rx.rds.wr_idx == fmdev->rx.rds.rd_idx) {
1096                         spin_unlock_irqrestore(&fmdev->rds_buff_lock, flags);
1097                         break;
1098                 }
1099                 memcpy(tmpbuf, &fmdev->rx.rds.buff[fmdev->rx.rds.rd_idx],
1100                                         FM_RDS_BLK_SIZE);
1101                 fmdev->rx.rds.rd_idx += FM_RDS_BLK_SIZE;
1102                 if (fmdev->rx.rds.rd_idx >= fmdev->rx.rds.buf_size)
1103                         fmdev->rx.rds.rd_idx = 0;
1104
1105                 spin_unlock_irqrestore(&fmdev->rds_buff_lock, flags);
1106
1107                 if (copy_to_user(buf, tmpbuf, FM_RDS_BLK_SIZE))
1108                         break;
1109
1110                 block_count++;
1111                 buf += FM_RDS_BLK_SIZE;
1112                 ret += FM_RDS_BLK_SIZE;
1113         }
1114         return ret;
1115 }
1116
1117 int fmc_set_freq(struct fmdev *fmdev, u32 freq_to_set)
1118 {
1119         switch (fmdev->curr_fmmode) {
1120         case FM_MODE_RX:
1121                 return fm_rx_set_freq(fmdev, freq_to_set);
1122
1123         case FM_MODE_TX:
1124                 return fm_tx_set_freq(fmdev, freq_to_set);
1125
1126         default:
1127                 return -EINVAL;
1128         }
1129 }
1130
1131 int fmc_get_freq(struct fmdev *fmdev, u32 *cur_tuned_frq)
1132 {
1133         if (fmdev->rx.freq == FM_UNDEFINED_FREQ) {
1134                 fmerr("RX frequency is not set\n");
1135                 return -EPERM;
1136         }
1137         if (cur_tuned_frq == NULL) {
1138                 fmerr("Invalid memory\n");
1139                 return -ENOMEM;
1140         }
1141
1142         switch (fmdev->curr_fmmode) {
1143         case FM_MODE_RX:
1144                 *cur_tuned_frq = fmdev->rx.freq;
1145                 return 0;
1146
1147         case FM_MODE_TX:
1148                 *cur_tuned_frq = 0;     /* TODO : Change this later */
1149                 return 0;
1150
1151         default:
1152                 return -EINVAL;
1153         }
1154
1155 }
1156
1157 int fmc_set_region(struct fmdev *fmdev, u8 region_to_set)
1158 {
1159         switch (fmdev->curr_fmmode) {
1160         case FM_MODE_RX:
1161                 return fm_rx_set_region(fmdev, region_to_set);
1162
1163         case FM_MODE_TX:
1164                 return fm_tx_set_region(fmdev, region_to_set);
1165
1166         default:
1167                 return -EINVAL;
1168         }
1169 }
1170
1171 int fmc_set_mute_mode(struct fmdev *fmdev, u8 mute_mode_toset)
1172 {
1173         switch (fmdev->curr_fmmode) {
1174         case FM_MODE_RX:
1175                 return fm_rx_set_mute_mode(fmdev, mute_mode_toset);
1176
1177         case FM_MODE_TX:
1178                 return fm_tx_set_mute_mode(fmdev, mute_mode_toset);
1179
1180         default:
1181                 return -EINVAL;
1182         }
1183 }
1184
1185 int fmc_set_stereo_mono(struct fmdev *fmdev, u16 mode)
1186 {
1187         switch (fmdev->curr_fmmode) {
1188         case FM_MODE_RX:
1189                 return fm_rx_set_stereo_mono(fmdev, mode);
1190
1191         case FM_MODE_TX:
1192                 return fm_tx_set_stereo_mono(fmdev, mode);
1193
1194         default:
1195                 return -EINVAL;
1196         }
1197 }
1198
1199 int fmc_set_rds_mode(struct fmdev *fmdev, u8 rds_en_dis)
1200 {
1201         switch (fmdev->curr_fmmode) {
1202         case FM_MODE_RX:
1203                 return fm_rx_set_rds_mode(fmdev, rds_en_dis);
1204
1205         case FM_MODE_TX:
1206                 return fm_tx_set_rds_mode(fmdev, rds_en_dis);
1207
1208         default:
1209                 return -EINVAL;
1210         }
1211 }
1212
1213 /* Sends power off command to the chip */
1214 static int fm_power_down(struct fmdev *fmdev)
1215 {
1216         u16 payload;
1217         int ret;
1218
1219         if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
1220                 fmerr("FM core is not ready\n");
1221                 return -EPERM;
1222         }
1223         if (fmdev->curr_fmmode == FM_MODE_OFF) {
1224                 fmdbg("FM chip is already in OFF state\n");
1225                 return 0;
1226         }
1227
1228         payload = 0x0;
1229         ret = fmc_send_cmd(fmdev, FM_POWER_MODE, REG_WR, &payload,
1230                 sizeof(payload), NULL, NULL);
1231         if (ret < 0)
1232                 return ret;
1233
1234         return fmc_release(fmdev);
1235 }
1236
1237 /* Reads init command from FM firmware file and loads to the chip */
1238 static int fm_download_firmware(struct fmdev *fmdev, const u8 *fw_name)
1239 {
1240         const struct firmware *fw_entry;
1241         struct bts_header *fw_header;
1242         struct bts_action *action;
1243         struct bts_action_delay *delay;
1244         u8 *fw_data;
1245         int ret, fw_len, cmd_cnt;
1246
1247         cmd_cnt = 0;
1248         set_bit(FM_FW_DW_INPROGRESS, &fmdev->flag);
1249
1250         ret = request_firmware(&fw_entry, fw_name,
1251                                 &fmdev->radio_dev->dev);
1252         if (ret < 0) {
1253                 fmerr("Unable to read firmware(%s) content\n", fw_name);
1254                 return ret;
1255         }
1256         fmdbg("Firmware(%s) length : %zu bytes\n", fw_name, fw_entry->size);
1257
1258         fw_data = (void *)fw_entry->data;
1259         fw_len = fw_entry->size;
1260
1261         fw_header = (struct bts_header *)fw_data;
1262         if (fw_header->magic != FM_FW_FILE_HEADER_MAGIC) {
1263                 fmerr("%s not a legal TI firmware file\n", fw_name);
1264                 ret = -EINVAL;
1265                 goto rel_fw;
1266         }
1267         fmdbg("FW(%s) magic number : 0x%x\n", fw_name, fw_header->magic);
1268
1269         /* Skip file header info , we already verified it */
1270         fw_data += sizeof(struct bts_header);
1271         fw_len -= sizeof(struct bts_header);
1272
1273         while (fw_data && fw_len > 0) {
1274                 action = (struct bts_action *)fw_data;
1275
1276                 switch (action->type) {
1277                 case ACTION_SEND_COMMAND:       /* Send */
1278                         if (fmc_send_cmd(fmdev, 0, 0, action->data,
1279                                                 action->size, NULL, NULL))
1280                                 goto rel_fw;
1281
1282                         cmd_cnt++;
1283                         break;
1284
1285                 case ACTION_DELAY:      /* Delay */
1286                         delay = (struct bts_action_delay *)action->data;
1287                         mdelay(delay->msec);
1288                         break;
1289                 }
1290
1291                 fw_data += (sizeof(struct bts_action) + (action->size));
1292                 fw_len -= (sizeof(struct bts_action) + (action->size));
1293         }
1294         fmdbg("Firmware commands(%d) loaded to chip\n", cmd_cnt);
1295 rel_fw:
1296         release_firmware(fw_entry);
1297         clear_bit(FM_FW_DW_INPROGRESS, &fmdev->flag);
1298
1299         return ret;
1300 }
1301
1302 /* Loads default RX configuration to the chip */
1303 static int load_default_rx_configuration(struct fmdev *fmdev)
1304 {
1305         int ret;
1306
1307         ret = fm_rx_set_volume(fmdev, FM_DEFAULT_RX_VOLUME);
1308         if (ret < 0)
1309                 return ret;
1310
1311         return fm_rx_set_rssi_threshold(fmdev, FM_DEFAULT_RSSI_THRESHOLD);
1312 }
1313
1314 /* Does FM power on sequence */
1315 static int fm_power_up(struct fmdev *fmdev, u8 mode)
1316 {
1317         u16 payload;
1318         __be16 asic_id, asic_ver;
1319         int resp_len, ret;
1320         u8 fw_name[50];
1321
1322         if (mode >= FM_MODE_ENTRY_MAX) {
1323                 fmerr("Invalid firmware download option\n");
1324                 return -EINVAL;
1325         }
1326
1327         /*
1328          * Initialize FM common module. FM GPIO toggling is
1329          * taken care in Shared Transport driver.
1330          */
1331         ret = fmc_prepare(fmdev);
1332         if (ret < 0) {
1333                 fmerr("Unable to prepare FM Common\n");
1334                 return ret;
1335         }
1336
1337         payload = FM_ENABLE;
1338         if (fmc_send_cmd(fmdev, FM_POWER_MODE, REG_WR, &payload,
1339                         sizeof(payload), NULL, NULL))
1340                 goto rel;
1341
1342         /* Allow the chip to settle down in Channel-8 mode */
1343         msleep(20);
1344
1345         if (fmc_send_cmd(fmdev, ASIC_ID_GET, REG_RD, NULL,
1346                         sizeof(asic_id), &asic_id, &resp_len))
1347                 goto rel;
1348
1349         if (fmc_send_cmd(fmdev, ASIC_VER_GET, REG_RD, NULL,
1350                         sizeof(asic_ver), &asic_ver, &resp_len))
1351                 goto rel;
1352
1353         fmdbg("ASIC ID: 0x%x , ASIC Version: %d\n",
1354                 be16_to_cpu(asic_id), be16_to_cpu(asic_ver));
1355
1356         sprintf(fw_name, "%s_%x.%d.bts", FM_FMC_FW_FILE_START,
1357                 be16_to_cpu(asic_id), be16_to_cpu(asic_ver));
1358
1359         ret = fm_download_firmware(fmdev, fw_name);
1360         if (ret < 0) {
1361                 fmdbg("Failed to download firmware file %s\n", fw_name);
1362                 goto rel;
1363         }
1364         sprintf(fw_name, "%s_%x.%d.bts", (mode == FM_MODE_RX) ?
1365                         FM_RX_FW_FILE_START : FM_TX_FW_FILE_START,
1366                         be16_to_cpu(asic_id), be16_to_cpu(asic_ver));
1367
1368         ret = fm_download_firmware(fmdev, fw_name);
1369         if (ret < 0) {
1370                 fmdbg("Failed to download firmware file %s\n", fw_name);
1371                 goto rel;
1372         } else
1373                 return ret;
1374 rel:
1375         return fmc_release(fmdev);
1376 }
1377
1378 /* Set FM Modes(TX, RX, OFF) */
1379 int fmc_set_mode(struct fmdev *fmdev, u8 fm_mode)
1380 {
1381         int ret = 0;
1382
1383         if (fm_mode >= FM_MODE_ENTRY_MAX) {
1384                 fmerr("Invalid FM mode\n");
1385                 return -EINVAL;
1386         }
1387         if (fmdev->curr_fmmode == fm_mode) {
1388                 fmdbg("Already fm is in mode(%d)\n", fm_mode);
1389                 return ret;
1390         }
1391
1392         switch (fm_mode) {
1393         case FM_MODE_OFF:       /* OFF Mode */
1394                 ret = fm_power_down(fmdev);
1395                 if (ret < 0) {
1396                         fmerr("Failed to set OFF mode\n");
1397                         return ret;
1398                 }
1399                 break;
1400
1401         case FM_MODE_TX:        /* TX Mode */
1402         case FM_MODE_RX:        /* RX Mode */
1403                 /* Power down before switching to TX or RX mode */
1404                 if (fmdev->curr_fmmode != FM_MODE_OFF) {
1405                         ret = fm_power_down(fmdev);
1406                         if (ret < 0) {
1407                                 fmerr("Failed to set OFF mode\n");
1408                                 return ret;
1409                         }
1410                         msleep(30);
1411                 }
1412                 ret = fm_power_up(fmdev, fm_mode);
1413                 if (ret < 0) {
1414                         fmerr("Failed to load firmware\n");
1415                         return ret;
1416                 }
1417         }
1418         fmdev->curr_fmmode = fm_mode;
1419
1420         /* Set default configuration */
1421         if (fmdev->curr_fmmode == FM_MODE_RX) {
1422                 fmdbg("Loading default rx configuration..\n");
1423                 ret = load_default_rx_configuration(fmdev);
1424                 if (ret < 0)
1425                         fmerr("Failed to load default values\n");
1426         }
1427
1428         return ret;
1429 }
1430
1431 /* Returns current FM mode (TX, RX, OFF) */
1432 int fmc_get_mode(struct fmdev *fmdev, u8 *fmmode)
1433 {
1434         if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
1435                 fmerr("FM core is not ready\n");
1436                 return -EPERM;
1437         }
1438         if (fmmode == NULL) {
1439                 fmerr("Invalid memory\n");
1440                 return -ENOMEM;
1441         }
1442
1443         *fmmode = fmdev->curr_fmmode;
1444         return 0;
1445 }
1446
1447 /* Called by ST layer when FM packet is available */
1448 static long fm_st_receive(void *arg, struct sk_buff *skb)
1449 {
1450         struct fmdev *fmdev;
1451
1452         fmdev = (struct fmdev *)arg;
1453
1454         if (skb == NULL) {
1455                 fmerr("Invalid SKB received from ST\n");
1456                 return -EFAULT;
1457         }
1458
1459         if (skb->cb[0] != FM_PKT_LOGICAL_CHAN_NUMBER) {
1460                 fmerr("Received SKB (%p) is not FM Channel 8 pkt\n", skb);
1461                 return -EINVAL;
1462         }
1463
1464         memcpy(skb_push(skb, 1), &skb->cb[0], 1);
1465         skb_queue_tail(&fmdev->rx_q, skb);
1466         tasklet_schedule(&fmdev->rx_task);
1467
1468         return 0;
1469 }
1470
1471 /*
1472  * Called by ST layer to indicate protocol registration completion
1473  * status.
1474  */
1475 static void fm_st_reg_comp_cb(void *arg, char data)
1476 {
1477         struct fmdev *fmdev;
1478
1479         fmdev = (struct fmdev *)arg;
1480         fmdev->streg_cbdata = data;
1481         complete(&wait_for_fmdrv_reg_comp);
1482 }
1483
1484 /*
1485  * This function will be called from FM V4L2 open function.
1486  * Register with ST driver and initialize driver data.
1487  */
1488 int fmc_prepare(struct fmdev *fmdev)
1489 {
1490         static struct st_proto_s fm_st_proto;
1491         int ret;
1492
1493         if (test_bit(FM_CORE_READY, &fmdev->flag)) {
1494                 fmdbg("FM Core is already up\n");
1495                 return 0;
1496         }
1497
1498         memset(&fm_st_proto, 0, sizeof(fm_st_proto));
1499         fm_st_proto.recv = fm_st_receive;
1500         fm_st_proto.match_packet = NULL;
1501         fm_st_proto.reg_complete_cb = fm_st_reg_comp_cb;
1502         fm_st_proto.write = NULL; /* TI ST driver will fill write pointer */
1503         fm_st_proto.priv_data = fmdev;
1504         fm_st_proto.chnl_id = 0x08;
1505         fm_st_proto.max_frame_size = 0xff;
1506         fm_st_proto.hdr_len = 1;
1507         fm_st_proto.offset_len_in_hdr = 0;
1508         fm_st_proto.len_size = 1;
1509         fm_st_proto.reserve = 1;
1510
1511         ret = st_register(&fm_st_proto);
1512         if (ret == -EINPROGRESS) {
1513                 init_completion(&wait_for_fmdrv_reg_comp);
1514                 fmdev->streg_cbdata = -EINPROGRESS;
1515                 fmdbg("%s waiting for ST reg completion signal\n", __func__);
1516
1517                 if (!wait_for_completion_timeout(&wait_for_fmdrv_reg_comp,
1518                                                  FM_ST_REG_TIMEOUT)) {
1519                         fmerr("Timeout(%d sec), didn't get reg "
1520                                         "completion signal from ST\n",
1521                                         jiffies_to_msecs(FM_ST_REG_TIMEOUT) / 1000);
1522                         return -ETIMEDOUT;
1523                 }
1524                 if (fmdev->streg_cbdata != 0) {
1525                         fmerr("ST reg comp CB called with error "
1526                                         "status %d\n", fmdev->streg_cbdata);
1527                         return -EAGAIN;
1528                 }
1529
1530                 ret = 0;
1531         } else if (ret == -1) {
1532                 fmerr("st_register failed %d\n", ret);
1533                 return -EAGAIN;
1534         }
1535
1536         if (fm_st_proto.write != NULL) {
1537                 g_st_write = fm_st_proto.write;
1538         } else {
1539                 fmerr("Failed to get ST write func pointer\n");
1540                 ret = st_unregister(&fm_st_proto);
1541                 if (ret < 0)
1542                         fmerr("st_unregister failed %d\n", ret);
1543                 return -EAGAIN;
1544         }
1545
1546         spin_lock_init(&fmdev->rds_buff_lock);
1547         spin_lock_init(&fmdev->resp_skb_lock);
1548
1549         /* Initialize TX queue and TX tasklet */
1550         skb_queue_head_init(&fmdev->tx_q);
1551         tasklet_init(&fmdev->tx_task, send_tasklet, (unsigned long)fmdev);
1552
1553         /* Initialize RX Queue and RX tasklet */
1554         skb_queue_head_init(&fmdev->rx_q);
1555         tasklet_init(&fmdev->rx_task, recv_tasklet, (unsigned long)fmdev);
1556
1557         fmdev->irq_info.stage = 0;
1558         atomic_set(&fmdev->tx_cnt, 1);
1559         fmdev->resp_comp = NULL;
1560
1561         init_timer(&fmdev->irq_info.timer);
1562         fmdev->irq_info.timer.function = &int_timeout_handler;
1563         fmdev->irq_info.timer.data = (unsigned long)fmdev;
1564         /*TODO: add FM_STIC_EVENT later */
1565         fmdev->irq_info.mask = FM_MAL_EVENT;
1566
1567         /* Region info */
1568         fmdev->rx.region = region_configs[default_radio_region];
1569
1570         fmdev->rx.mute_mode = FM_MUTE_OFF;
1571         fmdev->rx.rf_depend_mute = FM_RX_RF_DEPENDENT_MUTE_OFF;
1572         fmdev->rx.rds.flag = FM_RDS_DISABLE;
1573         fmdev->rx.freq = FM_UNDEFINED_FREQ;
1574         fmdev->rx.rds_mode = FM_RDS_SYSTEM_RDS;
1575         fmdev->rx.af_mode = FM_RX_RDS_AF_SWITCH_MODE_OFF;
1576         fmdev->irq_info.retry = 0;
1577
1578         fm_rx_reset_rds_cache(fmdev);
1579         init_waitqueue_head(&fmdev->rx.rds.read_queue);
1580
1581         fm_rx_reset_station_info(fmdev);
1582         set_bit(FM_CORE_READY, &fmdev->flag);
1583
1584         return ret;
1585 }
1586
1587 /*
1588  * This function will be called from FM V4L2 release function.
1589  * Unregister from ST driver.
1590  */
1591 int fmc_release(struct fmdev *fmdev)
1592 {
1593         static struct st_proto_s fm_st_proto;
1594         int ret;
1595
1596         if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
1597                 fmdbg("FM Core is already down\n");
1598                 return 0;
1599         }
1600         /* Service pending read */
1601         wake_up_interruptible(&fmdev->rx.rds.read_queue);
1602
1603         tasklet_kill(&fmdev->tx_task);
1604         tasklet_kill(&fmdev->rx_task);
1605
1606         skb_queue_purge(&fmdev->tx_q);
1607         skb_queue_purge(&fmdev->rx_q);
1608
1609         fmdev->resp_comp = NULL;
1610         fmdev->rx.freq = 0;
1611
1612         memset(&fm_st_proto, 0, sizeof(fm_st_proto));
1613         fm_st_proto.chnl_id = 0x08;
1614
1615         ret = st_unregister(&fm_st_proto);
1616
1617         if (ret < 0)
1618                 fmerr("Failed to de-register FM from ST %d\n", ret);
1619         else
1620                 fmdbg("Successfully unregistered from ST\n");
1621
1622         clear_bit(FM_CORE_READY, &fmdev->flag);
1623         return ret;
1624 }
1625
1626 /*
1627  * Module init function. Ask FM V4L module to register video device.
1628  * Allocate memory for FM driver context and RX RDS buffer.
1629  */
1630 static int __init fm_drv_init(void)
1631 {
1632         struct fmdev *fmdev = NULL;
1633         int ret = -ENOMEM;
1634
1635         fmdbg("FM driver version %s\n", FM_DRV_VERSION);
1636
1637         fmdev = kzalloc(sizeof(struct fmdev), GFP_KERNEL);
1638         if (NULL == fmdev) {
1639                 fmerr("Can't allocate operation structure memory\n");
1640                 return ret;
1641         }
1642         fmdev->rx.rds.buf_size = default_rds_buf * FM_RDS_BLK_SIZE;
1643         fmdev->rx.rds.buff = kzalloc(fmdev->rx.rds.buf_size, GFP_KERNEL);
1644         if (NULL == fmdev->rx.rds.buff) {
1645                 fmerr("Can't allocate rds ring buffer\n");
1646                 goto rel_dev;
1647         }
1648
1649         ret = fm_v4l2_init_video_device(fmdev, radio_nr);
1650         if (ret < 0)
1651                 goto rel_rdsbuf;
1652
1653         fmdev->irq_info.handlers = int_handler_table;
1654         fmdev->curr_fmmode = FM_MODE_OFF;
1655         fmdev->tx_data.pwr_lvl = FM_PWR_LVL_DEF;
1656         fmdev->tx_data.preemph = FM_TX_PREEMPH_50US;
1657         return ret;
1658
1659 rel_rdsbuf:
1660         kfree(fmdev->rx.rds.buff);
1661 rel_dev:
1662         kfree(fmdev);
1663
1664         return ret;
1665 }
1666
1667 /* Module exit function. Ask FM V4L module to unregister video device */
1668 static void __exit fm_drv_exit(void)
1669 {
1670         struct fmdev *fmdev = NULL;
1671
1672         fmdev = fm_v4l2_deinit_video_device();
1673         if (fmdev != NULL) {
1674                 kfree(fmdev->rx.rds.buff);
1675                 kfree(fmdev);
1676         }
1677 }
1678
1679 module_init(fm_drv_init);
1680 module_exit(fm_drv_exit);
1681
1682 /* ------------- Module Info ------------- */
1683 MODULE_AUTHOR("Manjunatha Halli <manjunatha_halli@ti.com>");
1684 MODULE_DESCRIPTION("FM Driver for TI's Connectivity chip. " FM_DRV_VERSION);
1685 MODULE_VERSION(FM_DRV_VERSION);
1686 MODULE_LICENSE("GPL");