drm/nouveau: consume the return of large GSP message

[drm/drm-misc.git] / drivers / media / radio / wl128x / fmdrv_common.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  FM Driver for Connectivity chip of Texas Instruments.
 *
 *  This sub-module of FM driver is common for FM RX and TX
 *  functionality. This module is responsible for:
 *  1) Forming group of Channel-8 commands to perform particular
 *     functionality (eg., frequency set require more than
 *     one Channel-8 command to be sent to the chip).
 *  2) Sending each Channel-8 command to the chip and reading
 *     response back over Shared Transport.
 *  3) Managing TX and RX Queues and BH bh Works.
 *  4) Handling FM Interrupt packet and taking appropriate action.
 *  5) Loading FM firmware to the chip (common, FM TX, and FM RX
 *     firmware files based on mode selection)
 *
 *  Copyright (C) 2011 Texas Instruments
 *  Author: Raja Mani <raja_mani@ti.com>
 *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
 */

#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/nospec.h>
#include <linux/jiffies.h>

#include "fmdrv.h"
#include "fmdrv_v4l2.h"
#include "fmdrv_common.h"
#include <linux/ti_wilink_st.h>
#include "fmdrv_rx.h"
#include "fmdrv_tx.h"

/* Region info */
static struct region_info region_configs[] = {
        /* Europe/US */
        {
         .chanl_space = FM_CHANNEL_SPACING_200KHZ * FM_FREQ_MUL,
         .bot_freq = 87500,     /* 87.5 MHz */
         .top_freq = 108000,    /* 108 MHz */
         .fm_band = 0,
         },
        /* Japan */
        {
         .chanl_space = FM_CHANNEL_SPACING_200KHZ * FM_FREQ_MUL,
         .bot_freq = 76000,     /* 76 MHz */
         .top_freq = 90000,     /* 90 MHz */
         .fm_band = 1,
         },
};

/* Band selection */
static u8 default_radio_region; /* Europe/US */
module_param(default_radio_region, byte, 0);
MODULE_PARM_DESC(default_radio_region, "Region: 0=Europe/US, 1=Japan");

/* RDS buffer blocks */
static u32 default_rds_buf = 300;
module_param(default_rds_buf, uint, 0444);
MODULE_PARM_DESC(default_rds_buf, "RDS buffer entries");

/* Radio Nr */
static u32 radio_nr = -1;
module_param(radio_nr, int, 0444);
MODULE_PARM_DESC(radio_nr, "Radio Nr");

/* FM irq handlers forward declaration */
static void fm_irq_send_flag_getcmd(struct fmdev *);
static void fm_irq_handle_flag_getcmd_resp(struct fmdev *);
static void fm_irq_handle_hw_malfunction(struct fmdev *);
static void fm_irq_handle_rds_start(struct fmdev *);
static void fm_irq_send_rdsdata_getcmd(struct fmdev *);
static void fm_irq_handle_rdsdata_getcmd_resp(struct fmdev *);
static void fm_irq_handle_rds_finish(struct fmdev *);
static void fm_irq_handle_tune_op_ended(struct fmdev *);
static void fm_irq_handle_power_enb(struct fmdev *);
static void fm_irq_handle_low_rssi_start(struct fmdev *);
static void fm_irq_afjump_set_pi(struct fmdev *);
static void fm_irq_handle_set_pi_resp(struct fmdev *);
static void fm_irq_afjump_set_pimask(struct fmdev *);
static void fm_irq_handle_set_pimask_resp(struct fmdev *);
static void fm_irq_afjump_setfreq(struct fmdev *);
static void fm_irq_handle_setfreq_resp(struct fmdev *);
static void fm_irq_afjump_enableint(struct fmdev *);
static void fm_irq_afjump_enableint_resp(struct fmdev *);
static void fm_irq_start_afjump(struct fmdev *);
static void fm_irq_handle_start_afjump_resp(struct fmdev *);
static void fm_irq_afjump_rd_freq(struct fmdev *);
static void fm_irq_afjump_rd_freq_resp(struct fmdev *);
static void fm_irq_handle_low_rssi_finish(struct fmdev *);
static void fm_irq_send_intmsk_cmd(struct fmdev *);
static void fm_irq_handle_intmsk_cmd_resp(struct fmdev *);

/*
 * When FM common module receives interrupt packet, following handlers
 * will be executed one after another to service the interrupt(s)
 */
enum fmc_irq_handler_index {
        FM_SEND_FLAG_GETCMD_IDX,
        FM_HANDLE_FLAG_GETCMD_RESP_IDX,

        /* HW malfunction irq handler */
        FM_HW_MAL_FUNC_IDX,

        /* RDS threshold reached irq handler */
        FM_RDS_START_IDX,
        FM_RDS_SEND_RDS_GETCMD_IDX,
        FM_RDS_HANDLE_RDS_GETCMD_RESP_IDX,
        FM_RDS_FINISH_IDX,

        /* Tune operation ended irq handler */
        FM_HW_TUNE_OP_ENDED_IDX,

        /* TX power enable irq handler */
        FM_HW_POWER_ENB_IDX,

        /* Low RSSI irq handler */
        FM_LOW_RSSI_START_IDX,
        FM_AF_JUMP_SETPI_IDX,
        FM_AF_JUMP_HANDLE_SETPI_RESP_IDX,
        FM_AF_JUMP_SETPI_MASK_IDX,
        FM_AF_JUMP_HANDLE_SETPI_MASK_RESP_IDX,
        FM_AF_JUMP_SET_AF_FREQ_IDX,
        FM_AF_JUMP_HANDLE_SET_AFFREQ_RESP_IDX,
        FM_AF_JUMP_ENABLE_INT_IDX,
        FM_AF_JUMP_ENABLE_INT_RESP_IDX,
        FM_AF_JUMP_START_AFJUMP_IDX,
        FM_AF_JUMP_HANDLE_START_AFJUMP_RESP_IDX,
        FM_AF_JUMP_RD_FREQ_IDX,
        FM_AF_JUMP_RD_FREQ_RESP_IDX,
        FM_LOW_RSSI_FINISH_IDX,

        /* Interrupt process post action */
        FM_SEND_INTMSK_CMD_IDX,
        FM_HANDLE_INTMSK_CMD_RESP_IDX,
};

/* FM interrupt handler table */
static int_handler_prototype int_handler_table[] = {
        fm_irq_send_flag_getcmd,
        fm_irq_handle_flag_getcmd_resp,
        fm_irq_handle_hw_malfunction,
        fm_irq_handle_rds_start, /* RDS threshold reached irq handler */
        fm_irq_send_rdsdata_getcmd,
        fm_irq_handle_rdsdata_getcmd_resp,
        fm_irq_handle_rds_finish,
        fm_irq_handle_tune_op_ended,
        fm_irq_handle_power_enb, /* TX power enable irq handler */
        fm_irq_handle_low_rssi_start,
        fm_irq_afjump_set_pi,
        fm_irq_handle_set_pi_resp,
        fm_irq_afjump_set_pimask,
        fm_irq_handle_set_pimask_resp,
        fm_irq_afjump_setfreq,
        fm_irq_handle_setfreq_resp,
        fm_irq_afjump_enableint,
        fm_irq_afjump_enableint_resp,
        fm_irq_start_afjump,
        fm_irq_handle_start_afjump_resp,
        fm_irq_afjump_rd_freq,
        fm_irq_afjump_rd_freq_resp,
        fm_irq_handle_low_rssi_finish,
        fm_irq_send_intmsk_cmd, /* Interrupt process post action */
        fm_irq_handle_intmsk_cmd_resp
};

static long (*g_st_write) (struct sk_buff *skb);
static struct completion wait_for_fmdrv_reg_comp;

static inline void fm_irq_call(struct fmdev *fmdev)
{
        fmdev->irq_info.handlers[fmdev->irq_info.stage](fmdev);
}

/* Continue next function in interrupt handler table */
static inline void fm_irq_call_stage(struct fmdev *fmdev, u8 stage)
{
        fmdev->irq_info.stage = stage;
        fm_irq_call(fmdev);
}

static inline void fm_irq_timeout_stage(struct fmdev *fmdev, u8 stage)
{
        fmdev->irq_info.stage = stage;
        mod_timer(&fmdev->irq_info.timer, jiffies + FM_DRV_TX_TIMEOUT);
}

#ifdef FM_DUMP_TXRX_PKT
 /* To dump outgoing FM Channel-8 packets */
inline void dump_tx_skb_data(struct sk_buff *skb)
{
        int len, len_org;
        u8 index;
        struct fm_cmd_msg_hdr *cmd_hdr;

        cmd_hdr = (struct fm_cmd_msg_hdr *)skb->data;
        printk(KERN_INFO "<<%shdr:%02x len:%02x opcode:%02x type:%s dlen:%02x",
               fm_cb(skb)->completion ? " " : "*", cmd_hdr->hdr,
               cmd_hdr->len, cmd_hdr->op,
               cmd_hdr->rd_wr ? "RD" : "WR", cmd_hdr->dlen);

        len_org = skb->len - FM_CMD_MSG_HDR_SIZE;
        if (len_org > 0) {
                printk(KERN_CONT "\n   data(%d): ", cmd_hdr->dlen);
                len = min(len_org, 14);
                for (index = 0; index < len; index++)
                        printk(KERN_CONT "%x ",
                               skb->data[FM_CMD_MSG_HDR_SIZE + index]);
                printk(KERN_CONT "%s", (len_org > 14) ? ".." : "");
        }
        printk(KERN_CONT "\n");
}

 /* To dump incoming FM Channel-8 packets */
inline void dump_rx_skb_data(struct sk_buff *skb)
{
        int len, len_org;
        u8 index;
        struct fm_event_msg_hdr *evt_hdr;

        evt_hdr = (struct fm_event_msg_hdr *)skb->data;
        printk(KERN_INFO ">> hdr:%02x len:%02x sts:%02x numhci:%02x opcode:%02x type:%s dlen:%02x",
               evt_hdr->hdr, evt_hdr->len,
               evt_hdr->status, evt_hdr->num_fm_hci_cmds, evt_hdr->op,
               (evt_hdr->rd_wr) ? "RD" : "WR", evt_hdr->dlen);

        len_org = skb->len - FM_EVT_MSG_HDR_SIZE;
        if (len_org > 0) {
                printk(KERN_CONT "\n   data(%d): ", evt_hdr->dlen);
                len = min(len_org, 14);
                for (index = 0; index < len; index++)
                        printk(KERN_CONT "%x ",
                               skb->data[FM_EVT_MSG_HDR_SIZE + index]);
                printk(KERN_CONT "%s", (len_org > 14) ? ".." : "");
        }
        printk(KERN_CONT "\n");
}
#endif

void fmc_update_region_info(struct fmdev *fmdev, u8 region_to_set)
{
        fmdev->rx.region = region_configs[region_to_set];
}

/*
 * FM common sub-module will queue this bh work whenever it receives
 * FM packet from ST driver.
 */
static void recv_bh_work(struct work_struct *t)
{
        struct fmdev *fmdev;
        struct fm_irq *irq_info;
        struct fm_event_msg_hdr *evt_hdr;
        struct sk_buff *skb;
        u8 num_fm_hci_cmds;
        unsigned long flags;

        fmdev = from_work(fmdev, t, tx_bh_work);
        irq_info = &fmdev->irq_info;
        /* Process all packets in the RX queue */
        while ((skb = skb_dequeue(&fmdev->rx_q))) {
                if (skb->len < sizeof(struct fm_event_msg_hdr)) {
                        fmerr("skb(%p) has only %d bytes, at least need %zu bytes to decode\n",
                              skb,
                              skb->len, sizeof(struct fm_event_msg_hdr));
                        kfree_skb(skb);
                        continue;
                }

                evt_hdr = (void *)skb->data;
                num_fm_hci_cmds = evt_hdr->num_fm_hci_cmds;

                /* FM interrupt packet? */
                if (evt_hdr->op == FM_INTERRUPT) {
                        /* FM interrupt handler started already? */
                        if (!test_bit(FM_INTTASK_RUNNING, &fmdev->flag)) {
                                set_bit(FM_INTTASK_RUNNING, &fmdev->flag);
                                if (irq_info->stage != 0) {
                                        fmerr("Inval stage resetting to zero\n");
                                        irq_info->stage = 0;
                                }

                                /*
                                 * Execute first function in interrupt handler
                                 * table.
                                 */
                                irq_info->handlers[irq_info->stage](fmdev);
                        } else {
                                set_bit(FM_INTTASK_SCHEDULE_PENDING, &fmdev->flag);
                        }
                        kfree_skb(skb);
                }
                /* Anyone waiting for this with completion handler? */
                else if (evt_hdr->op == fmdev->pre_op && fmdev->resp_comp != NULL) {

                        spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
                        fmdev->resp_skb = skb;
                        spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
                        complete(fmdev->resp_comp);

                        fmdev->resp_comp = NULL;
                        atomic_set(&fmdev->tx_cnt, 1);
                }
                /* Is this for interrupt handler? */
                else if (evt_hdr->op == fmdev->pre_op && fmdev->resp_comp == NULL) {
                        if (fmdev->resp_skb != NULL)
                                fmerr("Response SKB ptr not NULL\n");

                        spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
                        fmdev->resp_skb = skb;
                        spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);

                        /* Execute interrupt handler where state index points */
                        irq_info->handlers[irq_info->stage](fmdev);

                        kfree_skb(skb);
                        atomic_set(&fmdev->tx_cnt, 1);
                } else {
                        fmerr("Nobody claimed SKB(%p),purging\n", skb);
                }

                /*
                 * Check flow control field. If Num_FM_HCI_Commands field is
                 * not zero, queue FM TX bh work.
                 */
                if (num_fm_hci_cmds && atomic_read(&fmdev->tx_cnt))
                        if (!skb_queue_empty(&fmdev->tx_q))
                                queue_work(system_bh_wq, &fmdev->tx_bh_work);
        }
}

/* FM send_bh_work: is scheduled when FM packet has to be sent to chip */
static void send_bh_work(struct work_struct *t)
{
        struct fmdev *fmdev;
        struct sk_buff *skb;
        int len;

        fmdev = from_work(fmdev, t, tx_bh_work);

        if (!atomic_read(&fmdev->tx_cnt))
                return;

        /* Check, is there any timeout happened to last transmitted packet */
        if (time_is_before_jiffies(fmdev->last_tx_jiffies + FM_DRV_TX_TIMEOUT)) {
                fmerr("TX timeout occurred\n");
                atomic_set(&fmdev->tx_cnt, 1);
        }

        /* Send queued FM TX packets */
        skb = skb_dequeue(&fmdev->tx_q);
        if (!skb)
                return;

        atomic_dec(&fmdev->tx_cnt);
        fmdev->pre_op = fm_cb(skb)->fm_op;

        if (fmdev->resp_comp != NULL)
                fmerr("Response completion handler is not NULL\n");

        fmdev->resp_comp = fm_cb(skb)->completion;

        /* Write FM packet to ST driver */
        len = g_st_write(skb);
        if (len < 0) {
                kfree_skb(skb);
                fmdev->resp_comp = NULL;
                fmerr("TX bh work failed to send skb(%p)\n", skb);
                atomic_set(&fmdev->tx_cnt, 1);
        } else {
                fmdev->last_tx_jiffies = jiffies;
        }
}

/*
 * Queues FM Channel-8 packet to FM TX queue and schedules FM TX bh work for
 * transmission
 */
static int fm_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
                int payload_len, struct completion *wait_completion)
{
        struct sk_buff *skb;
        struct fm_cmd_msg_hdr *hdr;
        int size;

        if (fm_op >= FM_INTERRUPT) {
                fmerr("Invalid fm opcode - %d\n", fm_op);
                return -EINVAL;
        }
        if (test_bit(FM_FW_DW_INPROGRESS, &fmdev->flag) && payload == NULL) {
                fmerr("Payload data is NULL during fw download\n");
                return -EINVAL;
        }
        if (!test_bit(FM_FW_DW_INPROGRESS, &fmdev->flag))
                size =
                    FM_CMD_MSG_HDR_SIZE + ((payload == NULL) ? 0 : payload_len);
        else
                size = payload_len;

        skb = alloc_skb(size, GFP_ATOMIC);
        if (!skb) {
                fmerr("No memory to create new SKB\n");
                return -ENOMEM;
        }
        /*
         * Don't fill FM header info for the commands which come from
         * FM firmware file.
         */
        if (!test_bit(FM_FW_DW_INPROGRESS, &fmdev->flag) ||
                        test_bit(FM_INTTASK_RUNNING, &fmdev->flag)) {
                /* Fill command header info */
                hdr = skb_put(skb, FM_CMD_MSG_HDR_SIZE);
                hdr->hdr = FM_PKT_LOGICAL_CHAN_NUMBER;  /* 0x08 */

                /* 3 (fm_opcode,rd_wr,dlen) + payload len) */
                hdr->len = ((payload == NULL) ? 0 : payload_len) + 3;

                /* FM opcode */
                hdr->op = fm_op;

                /* read/write type */
                hdr->rd_wr = type;
                hdr->dlen = payload_len;
                fm_cb(skb)->fm_op = fm_op;

                /*
                 * If firmware download has finished and the command is
                 * not a read command then payload is != NULL - a write
                 * command with u16 payload - convert to be16
                 */
                if (payload != NULL)
                        *(__be16 *)payload = cpu_to_be16(*(u16 *)payload);

        } else if (payload != NULL) {
                fm_cb(skb)->fm_op = *((u8 *)payload + 2);
        }
        if (payload != NULL)
                skb_put_data(skb, payload, payload_len);

        fm_cb(skb)->completion = wait_completion;
        skb_queue_tail(&fmdev->tx_q, skb);
        queue_work(system_bh_wq, &fmdev->tx_bh_work);

        return 0;
}

/* Sends FM Channel-8 command to the chip and waits for the response */
int fmc_send_cmd(struct fmdev *fmdev, u8 fm_op, u16 type, void *payload,
                unsigned int payload_len, void *response, int *response_len)
{
        struct sk_buff *skb;
        struct fm_event_msg_hdr *evt_hdr;
        unsigned long flags;
        int ret;

        init_completion(&fmdev->maintask_comp);
        ret = fm_send_cmd(fmdev, fm_op, type, payload, payload_len,
                            &fmdev->maintask_comp);
        if (ret)
                return ret;

        if (!wait_for_completion_timeout(&fmdev->maintask_comp,
                                         FM_DRV_TX_TIMEOUT)) {
                fmerr("Timeout(%d sec),didn't get regcompletion signal from RX bh work\n",
                           jiffies_to_msecs(FM_DRV_TX_TIMEOUT) / 1000);
                return -ETIMEDOUT;
        }
        spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
        if (!fmdev->resp_skb) {
                spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);
                fmerr("Response SKB is missing\n");
                return -EFAULT;
        }
        skb = fmdev->resp_skb;
        fmdev->resp_skb = NULL;
        spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);

        evt_hdr = (void *)skb->data;
        if (evt_hdr->status != 0) {
                fmerr("Received event pkt status(%d) is not zero\n",
                           evt_hdr->status);
                kfree_skb(skb);
                return -EIO;
        }
        /* Send response data to caller */
        if (response != NULL && response_len != NULL && evt_hdr->dlen &&
            evt_hdr->dlen <= payload_len) {
                /* Skip header info and copy only response data */
                skb_pull(skb, sizeof(struct fm_event_msg_hdr));
                memcpy(response, skb->data, evt_hdr->dlen);
                *response_len = evt_hdr->dlen;
        } else if (response_len != NULL && evt_hdr->dlen == 0) {
                *response_len = 0;
        }
        kfree_skb(skb);

        return 0;
}

/* --- Helper functions used in FM interrupt handlers ---*/
static inline int check_cmdresp_status(struct fmdev *fmdev,
                struct sk_buff **skb)
{
        struct fm_event_msg_hdr *fm_evt_hdr;
        unsigned long flags;

        del_timer(&fmdev->irq_info.timer);

        spin_lock_irqsave(&fmdev->resp_skb_lock, flags);
        *skb = fmdev->resp_skb;
        fmdev->resp_skb = NULL;
        spin_unlock_irqrestore(&fmdev->resp_skb_lock, flags);

        fm_evt_hdr = (void *)(*skb)->data;
        if (fm_evt_hdr->status != 0) {
                fmerr("irq: opcode %x response status is not zero Initiating irq recovery process\n",
                                fm_evt_hdr->op);

                mod_timer(&fmdev->irq_info.timer, jiffies + FM_DRV_TX_TIMEOUT);
                return -1;
        }

        return 0;
}

static inline void fm_irq_common_cmd_resp_helper(struct fmdev *fmdev, u8 stage)
{
        struct sk_buff *skb;

        if (!check_cmdresp_status(fmdev, &skb))
                fm_irq_call_stage(fmdev, stage);
}

/*
 * Interrupt process timeout handler.
 * One of the irq handler did not get proper response from the chip. So take
 * recovery action here. FM interrupts are disabled in the beginning of
 * interrupt process. Therefore reset stage index to re-enable default
 * interrupts. So that next interrupt will be processed as usual.
 */
static void int_timeout_handler(struct timer_list *t)
{
        struct fmdev *fmdev;
        struct fm_irq *fmirq;

        fmdbg("irq: timeout,trying to re-enable fm interrupts\n");
        fmdev = from_timer(fmdev, t, irq_info.timer);
        fmirq = &fmdev->irq_info;
        fmirq->retry++;

        if (fmirq->retry > FM_IRQ_TIMEOUT_RETRY_MAX) {
                /* Stop recovery action (interrupt reenable process) and
                 * reset stage index & retry count values */
                fmirq->stage = 0;
                fmirq->retry = 0;
                fmerr("Recovery action failed duringirq processing, max retry reached\n");
                return;
        }
        fm_irq_call_stage(fmdev, FM_SEND_INTMSK_CMD_IDX);
}

/* --------- FM interrupt handlers ------------*/
static void fm_irq_send_flag_getcmd(struct fmdev *fmdev)
{
        u16 flag;

        /* Send FLAG_GET command , to know the source of interrupt */
        if (!fm_send_cmd(fmdev, FLAG_GET, REG_RD, NULL, sizeof(flag), NULL))
                fm_irq_timeout_stage(fmdev, FM_HANDLE_FLAG_GETCMD_RESP_IDX);
}

static void fm_irq_handle_flag_getcmd_resp(struct fmdev *fmdev)
{
        struct sk_buff *skb;
        struct fm_event_msg_hdr *fm_evt_hdr;

        if (check_cmdresp_status(fmdev, &skb))
                return;

        fm_evt_hdr = (void *)skb->data;
        if (fm_evt_hdr->dlen > sizeof(fmdev->irq_info.flag))
                return;

        /* Skip header info and copy only response data */
        skb_pull(skb, sizeof(struct fm_event_msg_hdr));
        memcpy(&fmdev->irq_info.flag, skb->data, fm_evt_hdr->dlen);

        fmdev->irq_info.flag = be16_to_cpu((__force __be16)fmdev->irq_info.flag);
        fmdbg("irq: flag register(0x%x)\n", fmdev->irq_info.flag);

        /* Continue next function in interrupt handler table */
        fm_irq_call_stage(fmdev, FM_HW_MAL_FUNC_IDX);
}

static void fm_irq_handle_hw_malfunction(struct fmdev *fmdev)
{
        if (fmdev->irq_info.flag & FM_MAL_EVENT & fmdev->irq_info.mask)
                fmerr("irq: HW MAL int received - do nothing\n");

        /* Continue next function in interrupt handler table */
        fm_irq_call_stage(fmdev, FM_RDS_START_IDX);
}

static void fm_irq_handle_rds_start(struct fmdev *fmdev)
{
        if (fmdev->irq_info.flag & FM_RDS_EVENT & fmdev->irq_info.mask) {
                fmdbg("irq: rds threshold reached\n");
                fmdev->irq_info.stage = FM_RDS_SEND_RDS_GETCMD_IDX;
        } else {
                /* Continue next function in interrupt handler table */
                fmdev->irq_info.stage = FM_HW_TUNE_OP_ENDED_IDX;
        }

        fm_irq_call(fmdev);
}

static void fm_irq_send_rdsdata_getcmd(struct fmdev *fmdev)
{
        /* Send the command to read RDS data from the chip */
        if (!fm_send_cmd(fmdev, RDS_DATA_GET, REG_RD, NULL,
                            (FM_RX_RDS_FIFO_THRESHOLD * 3), NULL))
                fm_irq_timeout_stage(fmdev, FM_RDS_HANDLE_RDS_GETCMD_RESP_IDX);
}

/* Keeps track of current RX channel AF (Alternate Frequency) */
static void fm_rx_update_af_cache(struct fmdev *fmdev, u8 af)
{
        struct tuned_station_info *stat_info = &fmdev->rx.stat_info;
        u8 reg_idx = fmdev->rx.region.fm_band;
        u8 index;
        u32 freq;

        /* First AF indicates the number of AF follows. Reset the list */
        if ((af >= FM_RDS_1_AF_FOLLOWS) && (af <= FM_RDS_25_AF_FOLLOWS)) {
                fmdev->rx.stat_info.af_list_max = (af - FM_RDS_1_AF_FOLLOWS + 1);
                fmdev->rx.stat_info.afcache_size = 0;
                fmdbg("No of expected AF : %d\n", fmdev->rx.stat_info.af_list_max);
                return;
        }

        if (af < FM_RDS_MIN_AF)
                return;
        if (reg_idx == FM_BAND_EUROPE_US && af > FM_RDS_MAX_AF)
                return;
        if (reg_idx == FM_BAND_JAPAN && af > FM_RDS_MAX_AF_JAPAN)
                return;

        freq = fmdev->rx.region.bot_freq + (af * 100);
        if (freq == fmdev->rx.freq) {
                fmdbg("Current freq(%d) is matching with received AF(%d)\n",
                                fmdev->rx.freq, freq);
                return;
        }
        /* Do check in AF cache */
        for (index = 0; index < stat_info->afcache_size; index++) {
                if (stat_info->af_cache[index] == freq)
                        break;
        }
        /* Reached the limit of the list - ignore the next AF */
        if (index == stat_info->af_list_max) {
                fmdbg("AF cache is full\n");
                return;
        }
        /*
         * If we reached the end of the list then this AF is not
         * in the list - add it.
         */
        if (index == stat_info->afcache_size) {
                fmdbg("Storing AF %d to cache index %d\n", freq, index);
                stat_info->af_cache[index] = freq;
                stat_info->afcache_size++;
        }
}

/*
 * Converts RDS buffer data from big endian format
 * to little endian format.
 */
static void fm_rdsparse_swapbytes(struct fmdev *fmdev,
                struct fm_rdsdata_format *rds_format)
{
        u8 index = 0;
        u8 *rds_buff;

        /*
         * Since in Orca the 2 RDS Data bytes are in little endian and
         * in Dolphin they are in big endian, the parsing of the RDS data
         * is chip dependent
         */
        if (fmdev->asci_id != 0x6350) {
                rds_buff = &rds_format->data.groupdatabuff.buff[0];
                while (index + 1 < FM_RX_RDS_INFO_FIELD_MAX) {
                        swap(rds_buff[index], rds_buff[index + 1]);
                        index += 2;
                }
        }
}

static void fm_irq_handle_rdsdata_getcmd_resp(struct fmdev *fmdev)
{
        struct sk_buff *skb;
        struct fm_rdsdata_format rds_fmt;
        struct fm_rds *rds = &fmdev->rx.rds;
        unsigned long group_idx, flags;
        u8 *rds_data, meta_data, tmpbuf[FM_RDS_BLK_SIZE];
        u8 type, blk_idx, idx;
        u16 cur_picode;
        u32 rds_len;

        if (check_cmdresp_status(fmdev, &skb))
                return;

        /* Skip header info */
        skb_pull(skb, sizeof(struct fm_event_msg_hdr));
        rds_data = skb->data;
        rds_len = skb->len;

        /* Parse the RDS data */
        while (rds_len >= FM_RDS_BLK_SIZE) {
                meta_data = rds_data[2];
                /* Get the type: 0=A, 1=B, 2=C, 3=C', 4=D, 5=E */
                type = (meta_data & 0x07);

                /* Transform the blk type into index sequence (0, 1, 2, 3, 4) */
                blk_idx = (type <= FM_RDS_BLOCK_C ? type : (type - 1));
                fmdbg("Block index:%d(%s)\n", blk_idx,
                           (meta_data & FM_RDS_STATUS_ERR_MASK) ? "Bad" : "Ok");

                if ((meta_data & FM_RDS_STATUS_ERR_MASK) != 0)
                        break;

                if (blk_idx > FM_RDS_BLK_IDX_D) {
                        fmdbg("Block sequence mismatch\n");
                        rds->last_blk_idx = -1;
                        break;
                }

                /* Skip checkword (control) byte and copy only data byte */
                idx = array_index_nospec(blk_idx * (FM_RDS_BLK_SIZE - 1),
                                         FM_RX_RDS_INFO_FIELD_MAX - (FM_RDS_BLK_SIZE - 1));

                memcpy(&rds_fmt.data.groupdatabuff.buff[idx], rds_data,
                       FM_RDS_BLK_SIZE - 1);

                rds->last_blk_idx = blk_idx;

                /* If completed a whole group then handle it */
                if (blk_idx == FM_RDS_BLK_IDX_D) {
                        fmdbg("Good block received\n");
                        fm_rdsparse_swapbytes(fmdev, &rds_fmt);

                        /*
                         * Extract PI code and store in local cache.
                         * We need this during AF switch processing.
                         */
                        cur_picode = be16_to_cpu((__force __be16)rds_fmt.data.groupgeneral.pidata);
                        if (fmdev->rx.stat_info.picode != cur_picode)
                                fmdev->rx.stat_info.picode = cur_picode;

                        fmdbg("picode:%d\n", cur_picode);

                        group_idx = (rds_fmt.data.groupgeneral.blk_b[0] >> 3);
                        fmdbg("(fmdrv):Group:%ld%s\n", group_idx/2,
                                        (group_idx % 2) ? "B" : "A");

                        group_idx = 1 << (rds_fmt.data.groupgeneral.blk_b[0] >> 3);
                        if (group_idx == FM_RDS_GROUP_TYPE_MASK_0A) {
                                fm_rx_update_af_cache(fmdev, rds_fmt.data.group0A.af[0]);
                                fm_rx_update_af_cache(fmdev, rds_fmt.data.group0A.af[1]);
                        }
                }
                rds_len -= FM_RDS_BLK_SIZE;
                rds_data += FM_RDS_BLK_SIZE;
        }

        /* Copy raw rds data to internal rds buffer */
        rds_data = skb->data;
        rds_len = skb->len;

        spin_lock_irqsave(&fmdev->rds_buff_lock, flags);
        while (rds_len > 0) {
                /*
                 * Fill RDS buffer as per V4L2 specification.
                 * Store control byte
                 */
                type = (rds_data[2] & 0x07);
                blk_idx = (type <= FM_RDS_BLOCK_C ? type : (type - 1));
                tmpbuf[2] = blk_idx;    /* Offset name */
                tmpbuf[2] |= blk_idx << 3;      /* Received offset */

                /* Store data byte */
                tmpbuf[0] = rds_data[0];
                tmpbuf[1] = rds_data[1];

                memcpy(&rds->buff[rds->wr_idx], &tmpbuf, FM_RDS_BLK_SIZE);
                rds->wr_idx = (rds->wr_idx + FM_RDS_BLK_SIZE) % rds->buf_size;

                /* Check for overflow & start over */
                if (rds->wr_idx == rds->rd_idx) {
                        fmdbg("RDS buffer overflow\n");
                        rds->wr_idx = 0;
                        rds->rd_idx = 0;
                        break;
                }
                rds_len -= FM_RDS_BLK_SIZE;
                rds_data += FM_RDS_BLK_SIZE;
        }
        spin_unlock_irqrestore(&fmdev->rds_buff_lock, flags);

        /* Wakeup read queue */
        if (rds->wr_idx != rds->rd_idx)
                wake_up_interruptible(&rds->read_queue);

        fm_irq_call_stage(fmdev, FM_RDS_FINISH_IDX);
}

static void fm_irq_handle_rds_finish(struct fmdev *fmdev)
{
        fm_irq_call_stage(fmdev, FM_HW_TUNE_OP_ENDED_IDX);
}

static void fm_irq_handle_tune_op_ended(struct fmdev *fmdev)
{
        if (fmdev->irq_info.flag & (FM_FR_EVENT | FM_BL_EVENT) & fmdev->
            irq_info.mask) {
                fmdbg("irq: tune ended/bandlimit reached\n");
                if (test_and_clear_bit(FM_AF_SWITCH_INPROGRESS, &fmdev->flag)) {
                        fmdev->irq_info.stage = FM_AF_JUMP_RD_FREQ_IDX;
                } else {
                        complete(&fmdev->maintask_comp);
                        fmdev->irq_info.stage = FM_HW_POWER_ENB_IDX;
                }
        } else
                fmdev->irq_info.stage = FM_HW_POWER_ENB_IDX;

        fm_irq_call(fmdev);
}

static void fm_irq_handle_power_enb(struct fmdev *fmdev)
{
        if (fmdev->irq_info.flag & FM_POW_ENB_EVENT) {
                fmdbg("irq: Power Enabled/Disabled\n");
                complete(&fmdev->maintask_comp);
        }

        fm_irq_call_stage(fmdev, FM_LOW_RSSI_START_IDX);
}

static void fm_irq_handle_low_rssi_start(struct fmdev *fmdev)
{
        if ((fmdev->rx.af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON) &&
            (fmdev->irq_info.flag & FM_LEV_EVENT & fmdev->irq_info.mask) &&
            (fmdev->rx.freq != FM_UNDEFINED_FREQ) &&
            (fmdev->rx.stat_info.afcache_size != 0)) {
                fmdbg("irq: rssi level has fallen below threshold level\n");

                /* Disable further low RSSI interrupts */
                fmdev->irq_info.mask &= ~FM_LEV_EVENT;

                fmdev->rx.afjump_idx = 0;
                fmdev->rx.freq_before_jump = fmdev->rx.freq;
                fmdev->irq_info.stage = FM_AF_JUMP_SETPI_IDX;
        } else {
                /* Continue next function in interrupt handler table */
                fmdev->irq_info.stage = FM_SEND_INTMSK_CMD_IDX;
        }

        fm_irq_call(fmdev);
}

static void fm_irq_afjump_set_pi(struct fmdev *fmdev)
{
        u16 payload;

        /* Set PI code - must be updated if the AF list is not empty */
        payload = fmdev->rx.stat_info.picode;
        if (!fm_send_cmd(fmdev, RDS_PI_SET, REG_WR, &payload, sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_SETPI_RESP_IDX);
}

static void fm_irq_handle_set_pi_resp(struct fmdev *fmdev)
{
        fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_SETPI_MASK_IDX);
}

/*
 * Set PI mask.
 * 0xFFFF = Enable PI code matching
 * 0x0000 = Disable PI code matching
 */
static void fm_irq_afjump_set_pimask(struct fmdev *fmdev)
{
        u16 payload;

        payload = 0x0000;
        if (!fm_send_cmd(fmdev, RDS_PI_MASK_SET, REG_WR, &payload, sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_SETPI_MASK_RESP_IDX);
}

static void fm_irq_handle_set_pimask_resp(struct fmdev *fmdev)
{
        fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_SET_AF_FREQ_IDX);
}

static void fm_irq_afjump_setfreq(struct fmdev *fmdev)
{
        u16 frq_index;
        u16 payload;

        fmdbg("Switch to %d KHz\n", fmdev->rx.stat_info.af_cache[fmdev->rx.afjump_idx]);
        frq_index = (fmdev->rx.stat_info.af_cache[fmdev->rx.afjump_idx] -
             fmdev->rx.region.bot_freq) / FM_FREQ_MUL;

        payload = frq_index;
        if (!fm_send_cmd(fmdev, AF_FREQ_SET, REG_WR, &payload, sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_SET_AFFREQ_RESP_IDX);
}

static void fm_irq_handle_setfreq_resp(struct fmdev *fmdev)
{
        fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_ENABLE_INT_IDX);
}

static void fm_irq_afjump_enableint(struct fmdev *fmdev)
{
        u16 payload;

        /* Enable FR (tuning operation ended) interrupt */
        payload = FM_FR_EVENT;
        if (!fm_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload, sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_AF_JUMP_ENABLE_INT_RESP_IDX);
}

static void fm_irq_afjump_enableint_resp(struct fmdev *fmdev)
{
        fm_irq_common_cmd_resp_helper(fmdev, FM_AF_JUMP_START_AFJUMP_IDX);
}

static void fm_irq_start_afjump(struct fmdev *fmdev)
{
        u16 payload;

        payload = FM_TUNER_AF_JUMP_MODE;
        if (!fm_send_cmd(fmdev, TUNER_MODE_SET, REG_WR, &payload,
                        sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_AF_JUMP_HANDLE_START_AFJUMP_RESP_IDX);
}

static void fm_irq_handle_start_afjump_resp(struct fmdev *fmdev)
{
        struct sk_buff *skb;

        if (check_cmdresp_status(fmdev, &skb))
                return;

        fmdev->irq_info.stage = FM_SEND_FLAG_GETCMD_IDX;
        set_bit(FM_AF_SWITCH_INPROGRESS, &fmdev->flag);
        clear_bit(FM_INTTASK_RUNNING, &fmdev->flag);
}

static void fm_irq_afjump_rd_freq(struct fmdev *fmdev)
{
        u16 payload;

        if (!fm_send_cmd(fmdev, FREQ_SET, REG_RD, NULL, sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_AF_JUMP_RD_FREQ_RESP_IDX);
}

static void fm_irq_afjump_rd_freq_resp(struct fmdev *fmdev)
{
        struct sk_buff *skb;
        u16 read_freq;
        u32 curr_freq, jumped_freq;

        if (check_cmdresp_status(fmdev, &skb))
                return;

        /* Skip header info and copy only response data */
        skb_pull(skb, sizeof(struct fm_event_msg_hdr));
        memcpy(&read_freq, skb->data, sizeof(read_freq));
        read_freq = be16_to_cpu((__force __be16)read_freq);
        curr_freq = fmdev->rx.region.bot_freq + ((u32)read_freq * FM_FREQ_MUL);

        jumped_freq = fmdev->rx.stat_info.af_cache[fmdev->rx.afjump_idx];

        /* If the frequency was changed the jump succeeded */
        if ((curr_freq != fmdev->rx.freq_before_jump) && (curr_freq == jumped_freq)) {
                fmdbg("Successfully switched to alternate freq %d\n", curr_freq);
                fmdev->rx.freq = curr_freq;
                fm_rx_reset_rds_cache(fmdev);

                /* AF feature is on, enable low level RSSI interrupt */
                if (fmdev->rx.af_mode == FM_RX_RDS_AF_SWITCH_MODE_ON)
                        fmdev->irq_info.mask |= FM_LEV_EVENT;

                fmdev->irq_info.stage = FM_LOW_RSSI_FINISH_IDX;
        } else {                /* jump to the next freq in the AF list */
                fmdev->rx.afjump_idx++;

                /* If we reached the end of the list - stop searching */
                if (fmdev->rx.afjump_idx >= fmdev->rx.stat_info.afcache_size) {
                        fmdbg("AF switch processing failed\n");
                        fmdev->irq_info.stage = FM_LOW_RSSI_FINISH_IDX;
                } else {        /* AF List is not over - try next one */

                        fmdbg("Trying next freq in AF cache\n");
                        fmdev->irq_info.stage = FM_AF_JUMP_SETPI_IDX;
                }
        }
        fm_irq_call(fmdev);
}

static void fm_irq_handle_low_rssi_finish(struct fmdev *fmdev)
{
        fm_irq_call_stage(fmdev, FM_SEND_INTMSK_CMD_IDX);
}

static void fm_irq_send_intmsk_cmd(struct fmdev *fmdev)
{
        u16 payload;

        /* Re-enable FM interrupts */
        payload = fmdev->irq_info.mask;

        if (!fm_send_cmd(fmdev, INT_MASK_SET, REG_WR, &payload,
                        sizeof(payload), NULL))
                fm_irq_timeout_stage(fmdev, FM_HANDLE_INTMSK_CMD_RESP_IDX);
}

static void fm_irq_handle_intmsk_cmd_resp(struct fmdev *fmdev)
{
        struct sk_buff *skb;

        if (check_cmdresp_status(fmdev, &skb))
                return;
        /*
         * This is last function in interrupt table to be executed.
         * So, reset stage index to 0.
         */
        fmdev->irq_info.stage = FM_SEND_FLAG_GETCMD_IDX;

        /* Start processing any pending interrupt */
        if (test_and_clear_bit(FM_INTTASK_SCHEDULE_PENDING, &fmdev->flag))
                fmdev->irq_info.handlers[fmdev->irq_info.stage](fmdev);
        else
                clear_bit(FM_INTTASK_RUNNING, &fmdev->flag);
}

/* Returns availability of RDS data in internal buffer */
int fmc_is_rds_data_available(struct fmdev *fmdev, struct file *file,
                                struct poll_table_struct *pts)
{
        poll_wait(file, &fmdev->rx.rds.read_queue, pts);
        if (fmdev->rx.rds.rd_idx != fmdev->rx.rds.wr_idx)
                return 0;

        return -EAGAIN;
}

/* Copies RDS data from internal buffer to user buffer */
int fmc_transfer_rds_from_internal_buff(struct fmdev *fmdev, struct file *file,
                u8 __user *buf, size_t count)
{
        u32 block_count;
        u8 tmpbuf[FM_RDS_BLK_SIZE];
        unsigned long flags;
        int ret;

        if (fmdev->rx.rds.wr_idx == fmdev->rx.rds.rd_idx) {
                if (file->f_flags & O_NONBLOCK)
                        return -EWOULDBLOCK;

                ret = wait_event_interruptible(fmdev->rx.rds.read_queue,
                                (fmdev->rx.rds.wr_idx != fmdev->rx.rds.rd_idx));
                if (ret)
                        return -EINTR;
        }

        /* Calculate block count from byte count */
        count /= FM_RDS_BLK_SIZE;
        block_count = 0;
        ret = 0;

        while (block_count < count) {
                spin_lock_irqsave(&fmdev->rds_buff_lock, flags);

                if (fmdev->rx.rds.wr_idx == fmdev->rx.rds.rd_idx) {
                        spin_unlock_irqrestore(&fmdev->rds_buff_lock, flags);
                        break;
                }
                memcpy(tmpbuf, &fmdev->rx.rds.buff[fmdev->rx.rds.rd_idx],
                                        FM_RDS_BLK_SIZE);
                fmdev->rx.rds.rd_idx += FM_RDS_BLK_SIZE;
                if (fmdev->rx.rds.rd_idx >= fmdev->rx.rds.buf_size)
                        fmdev->rx.rds.rd_idx = 0;

                spin_unlock_irqrestore(&fmdev->rds_buff_lock, flags);

                if (copy_to_user(buf, tmpbuf, FM_RDS_BLK_SIZE))
                        break;

                block_count++;
                buf += FM_RDS_BLK_SIZE;
                ret += FM_RDS_BLK_SIZE;
        }
        return ret;
}

int fmc_set_freq(struct fmdev *fmdev, u32 freq_to_set)
{
        switch (fmdev->curr_fmmode) {
        case FM_MODE_RX:
                return fm_rx_set_freq(fmdev, freq_to_set);

        case FM_MODE_TX:
                return fm_tx_set_freq(fmdev, freq_to_set);

        default:
                return -EINVAL;
        }
}

int fmc_get_freq(struct fmdev *fmdev, u32 *cur_tuned_frq)
{
        if (fmdev->rx.freq == FM_UNDEFINED_FREQ) {
                fmerr("RX frequency is not set\n");
                return -EPERM;
        }
        if (cur_tuned_frq == NULL) {
                fmerr("Invalid memory\n");
                return -ENOMEM;
        }

        switch (fmdev->curr_fmmode) {
        case FM_MODE_RX:
                *cur_tuned_frq = fmdev->rx.freq;
                return 0;

        case FM_MODE_TX:
                *cur_tuned_frq = 0;     /* TODO : Change this later */
                return 0;

        default:
                return -EINVAL;
        }

}

int fmc_set_region(struct fmdev *fmdev, u8 region_to_set)
{
        switch (fmdev->curr_fmmode) {
        case FM_MODE_RX:
                return fm_rx_set_region(fmdev, region_to_set);

        case FM_MODE_TX:
                return fm_tx_set_region(fmdev, region_to_set);

        default:
                return -EINVAL;
        }
}

int fmc_set_mute_mode(struct fmdev *fmdev, u8 mute_mode_toset)
{
        switch (fmdev->curr_fmmode) {
        case FM_MODE_RX:
                return fm_rx_set_mute_mode(fmdev, mute_mode_toset);

        case FM_MODE_TX:
                return fm_tx_set_mute_mode(fmdev, mute_mode_toset);

        default:
                return -EINVAL;
        }
}

int fmc_set_stereo_mono(struct fmdev *fmdev, u16 mode)
{
        switch (fmdev->curr_fmmode) {
        case FM_MODE_RX:
                return fm_rx_set_stereo_mono(fmdev, mode);

        case FM_MODE_TX:
                return fm_tx_set_stereo_mono(fmdev, mode);

        default:
                return -EINVAL;
        }
}

int fmc_set_rds_mode(struct fmdev *fmdev, u8 rds_en_dis)
{
        switch (fmdev->curr_fmmode) {
        case FM_MODE_RX:
                return fm_rx_set_rds_mode(fmdev, rds_en_dis);

        case FM_MODE_TX:
                return fm_tx_set_rds_mode(fmdev, rds_en_dis);

        default:
                return -EINVAL;
        }
}

/* Sends power off command to the chip */
static int fm_power_down(struct fmdev *fmdev)
{
        u16 payload;
        int ret;

        if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
                fmerr("FM core is not ready\n");
                return -EPERM;
        }
        if (fmdev->curr_fmmode == FM_MODE_OFF) {
                fmdbg("FM chip is already in OFF state\n");
                return 0;
        }

        payload = 0x0;
        ret = fmc_send_cmd(fmdev, FM_POWER_MODE, REG_WR, &payload,
                sizeof(payload), NULL, NULL);
        if (ret < 0)
                return ret;

        return fmc_release(fmdev);
}

/* Reads init command from FM firmware file and loads to the chip */
static int fm_download_firmware(struct fmdev *fmdev, const u8 *fw_name)
{
        const struct firmware *fw_entry;
        struct bts_header *fw_header;
        struct bts_action *action;
        struct bts_action_delay *delay;
        u8 *fw_data;
        int ret, fw_len;

        set_bit(FM_FW_DW_INPROGRESS, &fmdev->flag);

        ret = request_firmware(&fw_entry, fw_name,
                                &fmdev->radio_dev->dev);
        if (ret < 0) {
                fmerr("Unable to read firmware(%s) content\n", fw_name);
                return ret;
        }
        fmdbg("Firmware(%s) length : %zu bytes\n", fw_name, fw_entry->size);

        fw_data = (void *)fw_entry->data;
        fw_len = fw_entry->size;

        fw_header = (struct bts_header *)fw_data;
        if (fw_header->magic != FM_FW_FILE_HEADER_MAGIC) {
                fmerr("%s not a legal TI firmware file\n", fw_name);
                ret = -EINVAL;
                goto rel_fw;
        }
        fmdbg("FW(%s) magic number : 0x%x\n", fw_name, fw_header->magic);

        /* Skip file header info , we already verified it */
        fw_data += sizeof(struct bts_header);
        fw_len -= sizeof(struct bts_header);

        while (fw_data && fw_len > 0) {
                action = (struct bts_action *)fw_data;

                switch (action->type) {
                case ACTION_SEND_COMMAND:       /* Send */
                        ret = fmc_send_cmd(fmdev, 0, 0, action->data,
                                           action->size, NULL, NULL);
                        if (ret)
                                goto rel_fw;

                        break;

                case ACTION_DELAY:      /* Delay */
                        delay = (struct bts_action_delay *)action->data;
                        mdelay(delay->msec);
                        break;
                }

                fw_data += (sizeof(struct bts_action) + (action->size));
                fw_len -= (sizeof(struct bts_action) + (action->size));
        }
        fmdbg("Transferred only %d of %d bytes of the firmware to chip\n",
              fw_entry->size - fw_len, fw_entry->size);
rel_fw:
        release_firmware(fw_entry);
        clear_bit(FM_FW_DW_INPROGRESS, &fmdev->flag);

        return ret;
}

/* Loads default RX configuration to the chip */
static int load_default_rx_configuration(struct fmdev *fmdev)
{
        int ret;

        ret = fm_rx_set_volume(fmdev, FM_DEFAULT_RX_VOLUME);
        if (ret < 0)
                return ret;

        return fm_rx_set_rssi_threshold(fmdev, FM_DEFAULT_RSSI_THRESHOLD);
}

/* Does FM power on sequence */
static int fm_power_up(struct fmdev *fmdev, u8 mode)
{
        u16 payload;
        __be16 asic_id = 0, asic_ver = 0;
        int resp_len, ret;
        u8 fw_name[50];

        if (mode >= FM_MODE_ENTRY_MAX) {
                fmerr("Invalid firmware download option\n");
                return -EINVAL;
        }

        /*
         * Initialize FM common module. FM GPIO toggling is
         * taken care in Shared Transport driver.
         */
        ret = fmc_prepare(fmdev);
        if (ret < 0) {
                fmerr("Unable to prepare FM Common\n");
                return ret;
        }

        payload = FM_ENABLE;
        if (fmc_send_cmd(fmdev, FM_POWER_MODE, REG_WR, &payload,
                        sizeof(payload), NULL, NULL))
                goto rel;

        /* Allow the chip to settle down in Channel-8 mode */
        msleep(20);

        if (fmc_send_cmd(fmdev, ASIC_ID_GET, REG_RD, NULL,
                        sizeof(asic_id), &asic_id, &resp_len))
                goto rel;

        if (fmc_send_cmd(fmdev, ASIC_VER_GET, REG_RD, NULL,
                        sizeof(asic_ver), &asic_ver, &resp_len))
                goto rel;

        fmdbg("ASIC ID: 0x%x , ASIC Version: %d\n",
                be16_to_cpu(asic_id), be16_to_cpu(asic_ver));

        sprintf(fw_name, "%s_%x.%d.bts", FM_FMC_FW_FILE_START,
                be16_to_cpu(asic_id), be16_to_cpu(asic_ver));

        ret = fm_download_firmware(fmdev, fw_name);
        if (ret < 0) {
                fmdbg("Failed to download firmware file %s\n", fw_name);
                goto rel;
        }
        sprintf(fw_name, "%s_%x.%d.bts", (mode == FM_MODE_RX) ?
                        FM_RX_FW_FILE_START : FM_TX_FW_FILE_START,
                        be16_to_cpu(asic_id), be16_to_cpu(asic_ver));

        ret = fm_download_firmware(fmdev, fw_name);
        if (ret < 0) {
                fmdbg("Failed to download firmware file %s\n", fw_name);
                goto rel;
        } else
                return ret;
rel:
        return fmc_release(fmdev);
}

/* Set FM Modes(TX, RX, OFF) */
int fmc_set_mode(struct fmdev *fmdev, u8 fm_mode)
{
        int ret = 0;

        if (fm_mode >= FM_MODE_ENTRY_MAX) {
                fmerr("Invalid FM mode\n");
                return -EINVAL;
        }
        if (fmdev->curr_fmmode == fm_mode) {
                fmdbg("Already fm is in mode(%d)\n", fm_mode);
                return ret;
        }

        switch (fm_mode) {
        case FM_MODE_OFF:       /* OFF Mode */
                ret = fm_power_down(fmdev);
                if (ret < 0) {
                        fmerr("Failed to set OFF mode\n");
                        return ret;
                }
                break;

        case FM_MODE_TX:        /* TX Mode */
        case FM_MODE_RX:        /* RX Mode */
                /* Power down before switching to TX or RX mode */
                if (fmdev->curr_fmmode != FM_MODE_OFF) {
                        ret = fm_power_down(fmdev);
                        if (ret < 0) {
                                fmerr("Failed to set OFF mode\n");
                                return ret;
                        }
                        msleep(30);
                }
                ret = fm_power_up(fmdev, fm_mode);
                if (ret < 0) {
                        fmerr("Failed to load firmware\n");
                        return ret;
                }
        }
        fmdev->curr_fmmode = fm_mode;

        /* Set default configuration */
        if (fmdev->curr_fmmode == FM_MODE_RX) {
                fmdbg("Loading default rx configuration..\n");
                ret = load_default_rx_configuration(fmdev);
                if (ret < 0)
                        fmerr("Failed to load default values\n");
        }

        return ret;
}

/* Returns current FM mode (TX, RX, OFF) */
int fmc_get_mode(struct fmdev *fmdev, u8 *fmmode)
{
        if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
                fmerr("FM core is not ready\n");
                return -EPERM;
        }
        if (fmmode == NULL) {
                fmerr("Invalid memory\n");
                return -ENOMEM;
        }

        *fmmode = fmdev->curr_fmmode;
        return 0;
}

/* Called by ST layer when FM packet is available */
static long fm_st_receive(void *arg, struct sk_buff *skb)
{
        struct fmdev *fmdev;

        fmdev = arg;

        if (skb == NULL) {
                fmerr("Invalid SKB received from ST\n");
                return -EFAULT;
        }

        if (skb->cb[0] != FM_PKT_LOGICAL_CHAN_NUMBER) {
                fmerr("Received SKB (%p) is not FM Channel 8 pkt\n", skb);
                return -EINVAL;
        }

        memcpy(skb_push(skb, 1), &skb->cb[0], 1);
        skb_queue_tail(&fmdev->rx_q, skb);
        queue_work(system_bh_wq, &fmdev->rx_bh_work);

        return 0;
}

/*
 * Called by ST layer to indicate protocol registration completion
 * status.
 */
static void fm_st_reg_comp_cb(void *arg, int data)
{
        struct fmdev *fmdev;

        fmdev = (struct fmdev *)arg;
        fmdev->streg_cbdata = data;
        complete(&wait_for_fmdrv_reg_comp);
}

/*
 * This function will be called from FM V4L2 open function.
 * Register with ST driver and initialize driver data.
 */
int fmc_prepare(struct fmdev *fmdev)
{
        static struct st_proto_s fm_st_proto;
        int ret;

        if (test_bit(FM_CORE_READY, &fmdev->flag)) {
                fmdbg("FM Core is already up\n");
                return 0;
        }

        memset(&fm_st_proto, 0, sizeof(fm_st_proto));
        fm_st_proto.recv = fm_st_receive;
        fm_st_proto.match_packet = NULL;
        fm_st_proto.reg_complete_cb = fm_st_reg_comp_cb;
        fm_st_proto.write = NULL; /* TI ST driver will fill write pointer */
        fm_st_proto.priv_data = fmdev;
        fm_st_proto.chnl_id = 0x08;
        fm_st_proto.max_frame_size = 0xff;
        fm_st_proto.hdr_len = 1;
        fm_st_proto.offset_len_in_hdr = 0;
        fm_st_proto.len_size = 1;
        fm_st_proto.reserve = 1;

        ret = st_register(&fm_st_proto);
        if (ret == -EINPROGRESS) {
                init_completion(&wait_for_fmdrv_reg_comp);
                fmdev->streg_cbdata = -EINPROGRESS;
                fmdbg("%s waiting for ST reg completion signal\n", __func__);

                if (!wait_for_completion_timeout(&wait_for_fmdrv_reg_comp,
                                                 FM_ST_REG_TIMEOUT)) {
                        fmerr("Timeout(%d sec), didn't get reg completion signal from ST\n",
                                        jiffies_to_msecs(FM_ST_REG_TIMEOUT) / 1000);
                        return -ETIMEDOUT;
                }
                if (fmdev->streg_cbdata != 0) {
                        fmerr("ST reg comp CB called with error status %d\n",
                              fmdev->streg_cbdata);
                        return -EAGAIN;
                }

                ret = 0;
        } else if (ret < 0) {
                fmerr("st_register failed %d\n", ret);
                return -EAGAIN;
        }

        if (fm_st_proto.write != NULL) {
                g_st_write = fm_st_proto.write;
        } else {
                fmerr("Failed to get ST write func pointer\n");
                ret = st_unregister(&fm_st_proto);
                if (ret < 0)
                        fmerr("st_unregister failed %d\n", ret);
                return -EAGAIN;
        }

        spin_lock_init(&fmdev->rds_buff_lock);
        spin_lock_init(&fmdev->resp_skb_lock);

        /* Initialize TX queue and TX bh work */
        skb_queue_head_init(&fmdev->tx_q);
        INIT_WORK(&fmdev->tx_bh_work, send_bh_work);

        /* Initialize RX Queue and RX bh work */
        skb_queue_head_init(&fmdev->rx_q);
        INIT_WORK(&fmdev->rx_bh_work, recv_bh_work);

        fmdev->irq_info.stage = 0;
        atomic_set(&fmdev->tx_cnt, 1);
        fmdev->resp_comp = NULL;

        timer_setup(&fmdev->irq_info.timer, int_timeout_handler, 0);
        /*TODO: add FM_STIC_EVENT later */
        fmdev->irq_info.mask = FM_MAL_EVENT;

        /* Region info */
        fmdev->rx.region = region_configs[default_radio_region];

        fmdev->rx.mute_mode = FM_MUTE_OFF;
        fmdev->rx.rf_depend_mute = FM_RX_RF_DEPENDENT_MUTE_OFF;
        fmdev->rx.rds.flag = FM_RDS_DISABLE;
        fmdev->rx.freq = FM_UNDEFINED_FREQ;
        fmdev->rx.rds_mode = FM_RDS_SYSTEM_RDS;
        fmdev->rx.af_mode = FM_RX_RDS_AF_SWITCH_MODE_OFF;
        fmdev->irq_info.retry = 0;

        fm_rx_reset_rds_cache(fmdev);
        init_waitqueue_head(&fmdev->rx.rds.read_queue);

        fm_rx_reset_station_info(fmdev);
        set_bit(FM_CORE_READY, &fmdev->flag);

        return ret;
}

/*
 * This function will be called from FM V4L2 release function.
 * Unregister from ST driver.
 */
int fmc_release(struct fmdev *fmdev)
{
        static struct st_proto_s fm_st_proto;
        int ret;

        if (!test_bit(FM_CORE_READY, &fmdev->flag)) {
                fmdbg("FM Core is already down\n");
                return 0;
        }
        /* Service pending read */
        wake_up_interruptible(&fmdev->rx.rds.read_queue);

        cancel_work_sync(&fmdev->tx_bh_work);
        cancel_work_sync(&fmdev->rx_bh_work);

        skb_queue_purge(&fmdev->tx_q);
        skb_queue_purge(&fmdev->rx_q);

        fmdev->resp_comp = NULL;
        fmdev->rx.freq = 0;

        memset(&fm_st_proto, 0, sizeof(fm_st_proto));
        fm_st_proto.chnl_id = 0x08;

        ret = st_unregister(&fm_st_proto);

        if (ret < 0)
                fmerr("Failed to de-register FM from ST %d\n", ret);
        else
                fmdbg("Successfully unregistered from ST\n");

        clear_bit(FM_CORE_READY, &fmdev->flag);
        return ret;
}

/*
 * Module init function. Ask FM V4L module to register video device.
 * Allocate memory for FM driver context and RX RDS buffer.
 */
static int __init fm_drv_init(void)
{
        struct fmdev *fmdev = NULL;
        int ret = -ENOMEM;

        fmdbg("FM driver version %s\n", FM_DRV_VERSION);

        fmdev = kzalloc(sizeof(struct fmdev), GFP_KERNEL);
        if (NULL == fmdev) {
                fmerr("Can't allocate operation structure memory\n");
                return ret;
        }
        fmdev->rx.rds.buf_size = default_rds_buf * FM_RDS_BLK_SIZE;
        fmdev->rx.rds.buff = kzalloc(fmdev->rx.rds.buf_size, GFP_KERNEL);
        if (NULL == fmdev->rx.rds.buff) {
                fmerr("Can't allocate rds ring buffer\n");
                goto rel_dev;
        }

        ret = fm_v4l2_init_video_device(fmdev, radio_nr);
        if (ret < 0)
                goto rel_rdsbuf;

        fmdev->irq_info.handlers = int_handler_table;
        fmdev->curr_fmmode = FM_MODE_OFF;
        fmdev->tx_data.pwr_lvl = FM_PWR_LVL_DEF;
        fmdev->tx_data.preemph = FM_TX_PREEMPH_50US;
        return ret;

rel_rdsbuf:
        kfree(fmdev->rx.rds.buff);
rel_dev:
        kfree(fmdev);

        return ret;
}

/* Module exit function. Ask FM V4L module to unregister video device */
static void __exit fm_drv_exit(void)
{
        struct fmdev *fmdev = NULL;

        fmdev = fm_v4l2_deinit_video_device();
        if (fmdev != NULL) {
                kfree(fmdev->rx.rds.buff);
                kfree(fmdev);
        }
}

module_init(fm_drv_init);
module_exit(fm_drv_exit);

/* ------------- Module Info ------------- */
MODULE_AUTHOR("Manjunatha Halli <manjunatha_halli@ti.com>");
MODULE_DESCRIPTION("FM Driver for TI's Connectivity chip. " FM_DRV_VERSION);
MODULE_VERSION(FM_DRV_VERSION);
MODULE_LICENSE("GPL");