/************************************************************
 * <bsn.cl fy=2014 v=onl>
 *
 *           Copyright 2014 Big Switch Networks, Inc.
 *           Copyright 2014 Accton Technology Corporation.
 *
 * Licensed under the Eclipse Public License, Version 1.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *        http://www.eclipse.org/legal/epl-v10.html
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the
 * License.
 *
 * </bsn.cl>
 ************************************************************
 *
 *
 *
 ***********************************************************/
#include <onlp/platformi/sfpi.h>

#include <onlplib/i2c.h>
#include <onlplib/file.h>
#include "platform_lib.h"

#define MUX_START_INDEX 18
#define NUM_OF_SFP_PORT 32
static const int port_bus_index[NUM_OF_SFP_PORT] = {
 4,  5,  6,  7,  9,  8, 11, 10,
 0,  1,  2,  3, 12, 13, 14, 15,
16, 17, 18, 19, 28, 29, 30, 31,
20, 21, 22, 23, 24, 25, 26, 27
};

#define PORT_BUS_INDEX(port) (port_bus_index[port]+MUX_START_INDEX)
#define PORT_FORMAT "/sys/bus/i2c/devices/%d-0050/%s"

#define MODULE_PRESENT_FORMAT		"/sys/bus/i2c/devices/4-0060/module_present_%d"
#define MODULE_PRESENT_ALL_ATTR		"/sys/bus/i2c/devices/4-0060/module_present_all"

/************************************************************
 *
 * SFPI Entry Points
 *
 ***********************************************************/
int
onlp_sfpi_init(void)
{
    /* Called at initialization time */
    return ONLP_STATUS_OK;
}

int
onlp_sfpi_bitmap_get(onlp_sfp_bitmap_t* bmap)
{
    /*
     * Ports {0, 32}
     */
    int p;
    AIM_BITMAP_CLR_ALL(bmap);

    for(p = 0; p < NUM_OF_SFP_PORT; p++) {
        AIM_BITMAP_SET(bmap, p);
    }

    return ONLP_STATUS_OK;
}

int
onlp_sfpi_is_present(int port)
{
    /*
     * Return 1 if present.
     * Return 0 if not present.
     * Return < 0 if error.
     */
    int present;

	if (onlp_file_read_int(&present, MODULE_PRESENT_FORMAT, (port+1)) < 0) {
        AIM_LOG_ERROR("Unable to read present status from port(%d)\r\n", port);
        return ONLP_STATUS_E_INTERNAL;
    }

    return present;
}

int
onlp_sfpi_presence_bitmap_get(onlp_sfp_bitmap_t* dst)
{
    uint32_t bytes[4];
    FILE* fp;

    fp = fopen(MODULE_PRESENT_ALL_ATTR, "r");

    if(fp == NULL) {
        AIM_LOG_ERROR("Unable to open the sfp_is_present_all device file.");
        return ONLP_STATUS_E_INTERNAL;
    }
    int count = fscanf(fp, "%x %x %x %x",
                       bytes+0,
                       bytes+1,
                       bytes+2,
                       bytes+3
                       );
    fclose(fp);
    if(count != AIM_ARRAYSIZE(bytes)) {
        /* Likely a CPLD read timeout. */
        AIM_LOG_ERROR("Unable to read all fields from the sfp_is_present_all device file.");
        return ONLP_STATUS_E_INTERNAL;
    }

    /* Convert to 64 bit integer in port order */
    int i = 0;
    uint32_t presence_all = 0 ;
    for(i = AIM_ARRAYSIZE(bytes)-1; i >= 0; i--) {
        presence_all <<= 8;
        presence_all |= bytes[i];
    }

    /* Populate bitmap */
    for(i = 0; presence_all; i++) {
        AIM_BITMAP_MOD(dst, i, (presence_all & 1));
        presence_all >>= 1;
    }

    return ONLP_STATUS_OK;
}

int
onlp_sfpi_eeprom_read(int port, uint8_t data[256])
{
    /*
     * Read the SFP eeprom into data[]
     *
     * Return MISSING if SFP is missing.
     * Return OK if eeprom is read
     */
    int size = 0;
    memset(data, 0, 256);

	if(onlp_file_read(data, 256, &size, PORT_FORMAT, PORT_BUS_INDEX(port), "eeprom") != ONLP_STATUS_OK) {
        AIM_LOG_ERROR("Unable to read eeprom from port(%d)\r\n", port);
        return ONLP_STATUS_E_INTERNAL;
    }

    return ONLP_STATUS_OK;
}

int
onlp_sfpi_dev_readb(int port, uint8_t devaddr, uint8_t addr)
{
    int bus = PORT_BUS_INDEX(port);
    return onlp_i2c_readb(bus, devaddr, addr, ONLP_I2C_F_FORCE);
}

int
onlp_sfpi_dev_writeb(int port, uint8_t devaddr, uint8_t addr, uint8_t value)
{
    int bus = PORT_BUS_INDEX(port);
    return onlp_i2c_writeb(bus, devaddr, addr, value, ONLP_I2C_F_FORCE);
}

int
onlp_sfpi_dev_readw(int port, uint8_t devaddr, uint8_t addr)
{
    int bus = PORT_BUS_INDEX(port);
    return onlp_i2c_readw(bus, devaddr, addr, ONLP_I2C_F_FORCE);
}

int
onlp_sfpi_dev_writew(int port, uint8_t devaddr, uint8_t addr, uint16_t value)
{
    int bus = PORT_BUS_INDEX(port);
    return onlp_i2c_writew(bus, devaddr, addr, value, ONLP_I2C_F_FORCE);
}

int
onlp_sfpi_denit(void)
{
    return ONLP_STATUS_OK;
}

