ngene-i2c.c

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/*
 * ngene-i2c.c: nGene PCIe bridge driver i2c functions
 *
 * Copyright (C) 2005-2007 Micronas
 *
 * Copyright (C) 2008-2009 Ralph Metzler <[email protected]>
 *                         Modifications for new nGene firmware,
 *                         support for EEPROM-copying,
 *                         support for new dual DVB-S2 card prototype
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 only, as published by the Free Software Foundation.
 *
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 */

/* FIXME - some of these can probably be removed */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/io.h>
#include <asm/div64.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/timer.h>
#include <linux/byteorder/generic.h>
#include <linux/firmware.h>
#include <linux/vmalloc.h>

#include "ngene.h"

/* Firmware command for i2c operations */
static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
               u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
{
    struct ngene_command com;

    com.cmd.hdr.Opcode = CMD_I2C_READ;
    com.cmd.hdr.Length = outlen + 3;
    com.cmd.I2CRead.Device = adr << 1;
    memcpy(com.cmd.I2CRead.Data, out, outlen);
    com.cmd.I2CRead.Data[outlen] = inlen;
    com.cmd.I2CRead.Data[outlen + 1] = 0;
    com.in_len = outlen + 3;
    com.out_len = inlen + 1;

    if (ngene_command(dev, &com) < 0)
        return -EIO;

    if ((com.cmd.raw8[0] >> 1) != adr)
        return -EIO;

    if (flag)
        memcpy(in, com.cmd.raw8, inlen + 1);
    else
        memcpy(in, com.cmd.raw8 + 1, inlen);
    return 0;
}

static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
                   u8 *out, u8 outlen)
{
    struct ngene_command com;


    com.cmd.hdr.Opcode = CMD_I2C_WRITE;
    com.cmd.hdr.Length = outlen + 1;
    com.cmd.I2CRead.Device = adr << 1;
    memcpy(com.cmd.I2CRead.Data, out, outlen);
    com.in_len = outlen + 1;
    com.out_len = 1;

    if (ngene_command(dev, &com) < 0)
        return -EIO;

    if (com.cmd.raw8[0] == 1)
        return -EIO;

    return 0;
}

static void ngene_i2c_set_bus(struct ngene *dev, int bus)
{
    if (!(dev->card_info->i2c_access & 2))
        return;
    if (dev->i2c_current_bus == bus)
        return;

    switch (bus) {
    case 0:
        ngene_command_gpio_set(dev, 3, 0);
        ngene_command_gpio_set(dev, 2, 1);
        break;

    case 1:
        ngene_command_gpio_set(dev, 2, 0);
        ngene_command_gpio_set(dev, 3, 1);
        break;
    }
    dev->i2c_current_bus = bus;
}

static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
                 struct i2c_msg msg[], int num)
{
    struct ngene_channel *chan =
        (struct ngene_channel *)i2c_get_adapdata(adapter);
    struct ngene *dev = chan->dev;

    down(&dev->i2c_switch_mutex);
    ngene_i2c_set_bus(dev, chan->number);

    if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
        if (!ngene_command_i2c_read(dev, msg[0].addr,
                        msg[0].buf, msg[0].len,
                        msg[1].buf, msg[1].len, 0))
            goto done;

    if (num == 1 && !(msg[0].flags & I2C_M_RD))
        if (!ngene_command_i2c_write(dev, msg[0].addr,
                         msg[0].buf, msg[0].len))
            goto done;
    if (num == 1 && (msg[0].flags & I2C_M_RD))
        if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
                        msg[0].buf, msg[0].len, 0))
            goto done;

    up(&dev->i2c_switch_mutex);
    return -EIO;

done:
    up(&dev->i2c_switch_mutex);
    return num;
}


static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
{
    return I2C_FUNC_SMBUS_EMUL;
}

static struct i2c_algorithm ngene_i2c_algo = {
    .master_xfer = ngene_i2c_master_xfer,
    .functionality = ngene_i2c_functionality,
};

int ngene_i2c_init(struct ngene *dev, int dev_nr)
{
    struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);

    i2c_set_adapdata(adap, &(dev->channel[dev_nr]));

    strcpy(adap->name, "nGene");

    adap->algo = &ngene_i2c_algo;
    adap->algo_data = (void *)&(dev->channel[dev_nr]);
    adap->dev.parent = &dev->pci_dev->dev;

    return i2c_add_adapter(adap);
}