// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Abilis Systems Single DVB-T Receiver
 * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
 */

#include <linux/kernel.h>
#include "as102_drv.h"
#include "as10x_cmd.h"

/***************************/
/* FUNCTION DEFINITION     */
/***************************/

/**
 * as10x_cmd_get_context - Send get context command to AS10x
 * @adap:      pointer to AS10x bus adapter
 * @tag:       context tag
 * @pvalue:    pointer where to store context value read
 *
 * Return 0 on success or negative value in case of error.
 */
int as10x_cmd_get_context(struct as10x_bus_adapter_t *adap, uint16_t tag,
                          uint32_t *pvalue)
{
        int  error;
        struct as10x_cmd_t *pcmd, *prsp;

        pcmd = adap->cmd;
        prsp = adap->rsp;

        /* prepare command */
        as10x_cmd_build(pcmd, (++adap->cmd_xid),
                        sizeof(pcmd->body.context.req));

        /* fill command */
        pcmd->body.context.req.proc_id = cpu_to_le16(CONTROL_PROC_CONTEXT);
        pcmd->body.context.req.tag = cpu_to_le16(tag);
        pcmd->body.context.req.type = cpu_to_le16(GET_CONTEXT_DATA);

        /* send command */
        if (adap->ops->xfer_cmd) {
                error  = adap->ops->xfer_cmd(adap,
                                             (uint8_t *) pcmd,
                                             sizeof(pcmd->body.context.req)
                                             + HEADER_SIZE,
                                             (uint8_t *) prsp,
                                             sizeof(prsp->body.context.rsp)
                                             + HEADER_SIZE);
        } else {
                error = AS10X_CMD_ERROR;
        }

        if (error < 0)
                goto out;

        /* parse response: context command do not follow the common response */
        /* structure -> specific handling response parse required            */
        error = as10x_context_rsp_parse(prsp, CONTROL_PROC_CONTEXT_RSP);

        if (error == 0) {
                /* Response OK -> get response data */
                *pvalue = le32_to_cpu((__force __le32)prsp->body.context.rsp.reg_val.u.value32);
                /* value returned is always a 32-bit value */
        }

out:
        return error;
}

/**
 * as10x_cmd_set_context - send set context command to AS10x
 * @adap:      pointer to AS10x bus adapter
 * @tag:       context tag
 * @value:     value to set in context
 *
 * Return 0 on success or negative value in case of error.
 */
int as10x_cmd_set_context(struct as10x_bus_adapter_t *adap, uint16_t tag,
                          uint32_t value)
{
        int error;
        struct as10x_cmd_t *pcmd, *prsp;

        pcmd = adap->cmd;
        prsp = adap->rsp;

        /* prepare command */
        as10x_cmd_build(pcmd, (++adap->cmd_xid),
                        sizeof(pcmd->body.context.req));

        /* fill command */
        pcmd->body.context.req.proc_id = cpu_to_le16(CONTROL_PROC_CONTEXT);
        /* pcmd->body.context.req.reg_val.mode initialization is not required */
        pcmd->body.context.req.reg_val.u.value32 = (__force u32)cpu_to_le32(value);
        pcmd->body.context.req.tag = cpu_to_le16(tag);
        pcmd->body.context.req.type = cpu_to_le16(SET_CONTEXT_DATA);

        /* send command */
        if (adap->ops->xfer_cmd) {
                error  = adap->ops->xfer_cmd(adap,
                                             (uint8_t *) pcmd,
                                             sizeof(pcmd->body.context.req)
                                             + HEADER_SIZE,
                                             (uint8_t *) prsp,
                                             sizeof(prsp->body.context.rsp)
                                             + HEADER_SIZE);
        } else {
                error = AS10X_CMD_ERROR;
        }

        if (error < 0)
                goto out;

        /* parse response: context command do not follow the common response */
        /* structure -> specific handling response parse required            */
        error = as10x_context_rsp_parse(prsp, CONTROL_PROC_CONTEXT_RSP);

out:
        return error;
}

/**
 * as10x_cmd_eLNA_change_mode - send eLNA change mode command to AS10x
 * @adap:      pointer to AS10x bus adapter
 * @mode:      mode selected:
 *              - ON    : 0x0 => eLNA always ON
 *              - OFF   : 0x1 => eLNA always OFF
 *              - AUTO  : 0x2 => eLNA follow hysteresis parameters
 *                               to be ON or OFF
 *
 * Return 0 on success or negative value in case of error.
 */
int as10x_cmd_eLNA_change_mode(struct as10x_bus_adapter_t *adap, uint8_t mode)
{
        int error;
        struct as10x_cmd_t *pcmd, *prsp;

        pcmd = adap->cmd;
        prsp = adap->rsp;

        /* prepare command */
        as10x_cmd_build(pcmd, (++adap->cmd_xid),
                        sizeof(pcmd->body.cfg_change_mode.req));

        /* fill command */
        pcmd->body.cfg_change_mode.req.proc_id =
                cpu_to_le16(CONTROL_PROC_ELNA_CHANGE_MODE);
        pcmd->body.cfg_change_mode.req.mode = mode;

        /* send command */
        if (adap->ops->xfer_cmd) {
                error  = adap->ops->xfer_cmd(adap, (uint8_t *) pcmd,
                                sizeof(pcmd->body.cfg_change_mode.req)
                                + HEADER_SIZE, (uint8_t *) prsp,
                                sizeof(prsp->body.cfg_change_mode.rsp)
                                + HEADER_SIZE);
        } else {
                error = AS10X_CMD_ERROR;
        }

        if (error < 0)
                goto out;

        /* parse response */
        error = as10x_rsp_parse(prsp, CONTROL_PROC_ELNA_CHANGE_MODE_RSP);

out:
        return error;
}

/**
 * as10x_context_rsp_parse - Parse context command response
 * @prsp:       pointer to AS10x command response buffer
 * @proc_id:    id of the command
 *
 * Since the contex command response does not follow the common
 * response, a specific parse function is required.
 * Return 0 on success or negative value in case of error.
 */
int as10x_context_rsp_parse(struct as10x_cmd_t *prsp, uint16_t proc_id)
{
        int err;

        err = prsp->body.context.rsp.error;

        if ((err == 0) &&
            (le16_to_cpu(prsp->body.context.rsp.proc_id) == proc_id)) {
                return 0;
        }
        return AS10X_CMD_ERROR;
}