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  * To obtain the license, point your browser to
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 /* FIXME - some of these can probably be removed */
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/slab.h>
  31 #include <linux/poll.h>
  32 #include <linux/io.h>
  33 #include <asm/div64.h>
  34 #include <linux/pci.h>
  35 #include <linux/pci_ids.h>
  36 #include <linux/timer.h>
  37 #include <linux/byteorder/generic.h>
  38 #include <linux/firmware.h>
  39 #include <linux/vmalloc.h>
  40
  41 #include "ngene.h"
  42
  43 /* Firmware command for i2c operations */
  44 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
  45                            u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
  46 {
  47         struct ngene_command com;
  48
  49         com.cmd.hdr.Opcode = CMD_I2C_READ;
  50         com.cmd.hdr.Length = outlen + 3;
  51         com.cmd.I2CRead.Device = adr << 1;
  52         memcpy(com.cmd.I2CRead.Data, out, outlen);
  53         com.cmd.I2CRead.Data[outlen] = inlen;
  54         com.cmd.I2CRead.Data[outlen + 1] = 0;
  55         com.in_len = outlen + 3;
  56         com.out_len = inlen + 1;
  57
  58         if (ngene_command(dev, &com) < 0)
  59                 return -EIO;
  60
  61         if ((com.cmd.raw8[0] >> 1) != adr)
  62                 return -EIO;
  63
  64         if (flag)
  65                 memcpy(in, com.cmd.raw8, inlen + 1);
  66         else
  67                 memcpy(in, com.cmd.raw8 + 1, inlen);
  68         return 0;
  69 }
  70
  71 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
  72                                    u8 *out, u8 outlen)
  73 {
  74         struct ngene_command com;
  75
  76
  77         com.cmd.hdr.Opcode = CMD_I2C_WRITE;
  78         com.cmd.hdr.Length = outlen + 1;
  79         com.cmd.I2CRead.Device = adr << 1;
  80         memcpy(com.cmd.I2CRead.Data, out, outlen);
  81         com.in_len = outlen + 1;
  82         com.out_len = 1;
  83
  84         if (ngene_command(dev, &com) < 0)
  85                 return -EIO;
  86
  87         if (com.cmd.raw8[0] == 1)
  88                 return -EIO;
  89
  90         return 0;
  91 }
  92
  93 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
  94 {
  95         if (!(dev->card_info->i2c_access & 2))
  96                 return;
  97         if (dev->i2c_current_bus == bus)
  98                 return;
  99
 100         switch (bus) {
 101         case 0:
 102                 ngene_command_gpio_set(dev, 3, 0);
 103                 ngene_command_gpio_set(dev, 2, 1);
 104                 break;
 105
 106         case 1:
 107                 ngene_command_gpio_set(dev, 2, 0);
 108                 ngene_command_gpio_set(dev, 3, 1);
 109                 break;
 110         }
 111         dev->i2c_current_bus = bus;
 112 }
 113
 114 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
 115                                  struct i2c_msg msg[], int num)
 116 {
 117         struct ngene_channel *chan =
 118                 (struct ngene_channel *)i2c_get_adapdata(adapter);
 119         struct ngene *dev = chan->dev;
 120
 121         mutex_lock(&dev->i2c_switch_mutex);
 122         ngene_i2c_set_bus(dev, chan->number);
 123
 124         if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
 125                 if (!ngene_command_i2c_read(dev, msg[0].addr,
 126                                             msg[0].buf, msg[0].len,
 127                                             msg[1].buf, msg[1].len, 0))
 128                         goto done;
 129
 130         if (num == 1 && !(msg[0].flags & I2C_M_RD))
 131                 if (!ngene_command_i2c_write(dev, msg[0].addr,
 132                                              msg[0].buf, msg[0].len))
 133                         goto done;
 134         if (num == 1 && (msg[0].flags & I2C_M_RD))
 135                 if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
 136                                             msg[0].buf, msg[0].len, 0))
 137                         goto done;
 138
 139         mutex_unlock(&dev->i2c_switch_mutex);
 140         return -EIO;
 141
 142 done:
 143         mutex_unlock(&dev->i2c_switch_mutex);
 144         return num;
 145 }
 146
 147
 148 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
 149 {
 150         return I2C_FUNC_SMBUS_EMUL;
 151 }
 152
 153 static const struct i2c_algorithm ngene_i2c_algo = {
 154         .master_xfer = ngene_i2c_master_xfer,
 155         .functionality = ngene_i2c_functionality,
 156 };
 157
 158 int ngene_i2c_init(struct ngene *dev, int dev_nr)
 159 {
 160         struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
 161
 162         i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
 163
 164         strcpy(adap->name, "nGene");
 165
 166         adap->algo = &ngene_i2c_algo;
 167         adap->algo_data = (void *)&(dev->channel[dev_nr]);
 168         adap->dev.parent = &dev->pci_dev->dev;
 169
 170         return i2c_add_adapter(adap);
 171 }
 172