LXR linux/drivers/media/pci/ngene/ngene-i2c.c

   1/*
   2 * ngene-i2c.c: nGene PCIe bridge driver i2c functions
   3 *
   4 * Copyright (C) 2005-2007 Micronas
   5 *
   6 * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
   7 *                         Modifications for new nGene firmware,
   8 *                         support for EEPROM-copying,
   9 *                         support for new dual DVB-S2 card prototype
  10 *
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License
  14 * version 2 only, as published by the Free Software Foundation.
  15 *
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 * GNU General Public License for more details.
  21 *
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  26 * 02110-1301, USA
  27 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  28 */
  29
  30/* FIXME - some of these can probably be removed */
  31#include <linux/module.h>
  32#include <linux/init.h>
  33#include <linux/delay.h>
  34#include <linux/slab.h>
  35#include <linux/poll.h>
  36#include <linux/io.h>
  37#include <asm/div64.h>
  38#include <linux/pci.h>
  39#include <linux/pci_ids.h>
  40#include <linux/timer.h>
  41#include <linux/byteorder/generic.h>
  42#include <linux/firmware.h>
  43#include <linux/vmalloc.h>
  44
  45#include "ngene.h"
  46
  47/* Firmware command for i2c operations */
  48static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
  49                           u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
  50{
  51        struct ngene_command com;
  52
  53        com.cmd.hdr.Opcode = CMD_I2C_READ;
  54        com.cmd.hdr.Length = outlen + 3;
  55        com.cmd.I2CRead.Device = adr << 1;
  56        memcpy(com.cmd.I2CRead.Data, out, outlen);
  57        com.cmd.I2CRead.Data[outlen] = inlen;
  58        com.cmd.I2CRead.Data[outlen + 1] = 0;
  59        com.in_len = outlen + 3;
  60        com.out_len = inlen + 1;
  61
  62        if (ngene_command(dev, &com) < 0)
  63                return -EIO;
  64
  65        if ((com.cmd.raw8[0] >> 1) != adr)
  66                return -EIO;
  67
  68        if (flag)
  69                memcpy(in, com.cmd.raw8, inlen + 1);
  70        else
  71                memcpy(in, com.cmd.raw8 + 1, inlen);
  72        return 0;
  73}
  74
  75static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
  76                                   u8 *out, u8 outlen)
  77{
  78        struct ngene_command com;
  79
  80
  81        com.cmd.hdr.Opcode = CMD_I2C_WRITE;
  82        com.cmd.hdr.Length = outlen + 1;
  83        com.cmd.I2CRead.Device = adr << 1;
  84        memcpy(com.cmd.I2CRead.Data, out, outlen);
  85        com.in_len = outlen + 1;
  86        com.out_len = 1;
  87
  88        if (ngene_command(dev, &com) < 0)
  89                return -EIO;
  90
  91        if (com.cmd.raw8[0] == 1)
  92                return -EIO;
  93
  94        return 0;
  95}
  96
  97static void ngene_i2c_set_bus(struct ngene *dev, int bus)
  98{
  99        if (!(dev->card_info->i2c_access & 2))
 100                return;
 101        if (dev->i2c_current_bus == bus)
 102                return;
 103
 104        switch (bus) {
 105        case 0:
 106                ngene_command_gpio_set(dev, 3, 0);
 107                ngene_command_gpio_set(dev, 2, 1);
 108                break;
 109
 110        case 1:
 111                ngene_command_gpio_set(dev, 2, 0);
 112                ngene_command_gpio_set(dev, 3, 1);
 113                break;
 114        }
 115        dev->i2c_current_bus = bus;
 116}
 117
 118static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
 119                                 struct i2c_msg msg[], int num)
 120{
 121        struct ngene_channel *chan =
 122                (struct ngene_channel *)i2c_get_adapdata(adapter);
 123        struct ngene *dev = chan->dev;
 124
 125        down(&dev->i2c_switch_mutex);
 126        ngene_i2c_set_bus(dev, chan->number);
 127
 128        if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
 129                if (!ngene_command_i2c_read(dev, msg[0].addr,
 130                                            msg[0].buf, msg[0].len,
 131                                            msg[1].buf, msg[1].len, 0))
 132                        goto done;
 133
 134        if (num == 1 && !(msg[0].flags & I2C_M_RD))
 135                if (!ngene_command_i2c_write(dev, msg[0].addr,
 136                                             msg[0].buf, msg[0].len))
 137                        goto done;
 138        if (num == 1 && (msg[0].flags & I2C_M_RD))
 139                if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
 140                                            msg[0].buf, msg[0].len, 0))
 141                        goto done;
 142
 143        up(&dev->i2c_switch_mutex);
 144        return -EIO;
 145
 146done:
 147        up(&dev->i2c_switch_mutex);
 148        return num;
 149}
 150
 151
 152static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
 153{
 154        return I2C_FUNC_SMBUS_EMUL;
 155}
 156
 157static struct i2c_algorithm ngene_i2c_algo = {
 158        .master_xfer = ngene_i2c_master_xfer,
 159        .functionality = ngene_i2c_functionality,
 160};
 161
 162int ngene_i2c_init(struct ngene *dev, int dev_nr)
 163{
 164        struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
 165
 166        i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
 167
 168        strcpy(adap->name, "nGene");
 169
 170        adap->algo = &ngene_i2c_algo;
 171        adap->algo_data = (void *)&(dev->channel[dev_nr]);
 172        adap->dev.parent = &dev->pci_dev->dev;
 173
 174        return i2c_add_adapter(adap);
 175}
 176
 177