kernel/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 */
  48 static 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
  75 static 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
  97 static 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
 118 static 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
 146 done:
 147         up(&dev->i2c_switch_mutex);
 148         return num;
 149 }
 150
 151
 152 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
 153 {
 154         return I2C_FUNC_SMBUS_EMUL;
 155 }
 156
 157 static struct i2c_algorithm ngene_i2c_algo = {
 158         .master_xfer = ngene_i2c_master_xfer,
 159         .functionality = ngene_i2c_functionality,
 160 };
 161
 162 int 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