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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ngene-i2c.c: nGene PCIe bridge driver i2c functions
   4 *
   5 * Copyright (C) 2005-2007 Micronas
   6 *
   7 * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
   8 *                         Modifications for new nGene firmware,
   9 *                         support for EEPROM-copying,
  10 *                         support for new dual DVB-S2 card prototype
  11 */
  12
  13/* FIXME - some of these can probably be removed */
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/delay.h>
  17#include <linux/slab.h>
  18#include <linux/poll.h>
  19#include <linux/io.h>
  20#include <asm/div64.h>
  21#include <linux/pci.h>
  22#include <linux/pci_ids.h>
  23#include <linux/timer.h>
  24#include <linux/byteorder/generic.h>
  25#include <linux/firmware.h>
  26#include <linux/vmalloc.h>
  27
  28#include "ngene.h"
  29
  30/* Firmware command for i2c operations */
  31static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
  32                           u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
  33{
  34        struct ngene_command com;
  35
  36        com.cmd.hdr.Opcode = CMD_I2C_READ;
  37        com.cmd.hdr.Length = outlen + 3;
  38        com.cmd.I2CRead.Device = adr << 1;
  39        memcpy(com.cmd.I2CRead.Data, out, outlen);
  40        com.cmd.I2CRead.Data[outlen] = inlen;
  41        com.cmd.I2CRead.Data[outlen + 1] = 0;
  42        com.in_len = outlen + 3;
  43        com.out_len = inlen + 1;
  44
  45        if (ngene_command(dev, &com) < 0)
  46                return -EIO;
  47
  48        if ((com.cmd.raw8[0] >> 1) != adr)
  49                return -EIO;
  50
  51        if (flag)
  52                memcpy(in, com.cmd.raw8, inlen + 1);
  53        else
  54                memcpy(in, com.cmd.raw8 + 1, inlen);
  55        return 0;
  56}
  57
  58static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
  59                                   u8 *out, u8 outlen)
  60{
  61        struct ngene_command com;
  62
  63
  64        com.cmd.hdr.Opcode = CMD_I2C_WRITE;
  65        com.cmd.hdr.Length = outlen + 1;
  66        com.cmd.I2CRead.Device = adr << 1;
  67        memcpy(com.cmd.I2CRead.Data, out, outlen);
  68        com.in_len = outlen + 1;
  69        com.out_len = 1;
  70
  71        if (ngene_command(dev, &com) < 0)
  72                return -EIO;
  73
  74        if (com.cmd.raw8[0] == 1)
  75                return -EIO;
  76
  77        return 0;
  78}
  79
  80static void ngene_i2c_set_bus(struct ngene *dev, int bus)
  81{
  82        if (!(dev->card_info->i2c_access & 2))
  83                return;
  84        if (dev->i2c_current_bus == bus)
  85                return;
  86
  87        switch (bus) {
  88        case 0:
  89                ngene_command_gpio_set(dev, 3, 0);
  90                ngene_command_gpio_set(dev, 2, 1);
  91                break;
  92
  93        case 1:
  94                ngene_command_gpio_set(dev, 2, 0);
  95                ngene_command_gpio_set(dev, 3, 1);
  96                break;
  97        }
  98        dev->i2c_current_bus = bus;
  99}
 100
 101static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
 102                                 struct i2c_msg msg[], int num)
 103{
 104        struct ngene_channel *chan =
 105                (struct ngene_channel *)i2c_get_adapdata(adapter);
 106        struct ngene *dev = chan->dev;
 107
 108        mutex_lock(&dev->i2c_switch_mutex);
 109        ngene_i2c_set_bus(dev, chan->number);
 110
 111        if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
 112                if (!ngene_command_i2c_read(dev, msg[0].addr,
 113                                            msg[0].buf, msg[0].len,
 114                                            msg[1].buf, msg[1].len, 0))
 115                        goto done;
 116
 117        if (num == 1 && !(msg[0].flags & I2C_M_RD))
 118                if (!ngene_command_i2c_write(dev, msg[0].addr,
 119                                             msg[0].buf, msg[0].len))
 120                        goto done;
 121        if (num == 1 && (msg[0].flags & I2C_M_RD))
 122                if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
 123                                            msg[0].buf, msg[0].len, 0))
 124                        goto done;
 125
 126        mutex_unlock(&dev->i2c_switch_mutex);
 127        return -EIO;
 128
 129done:
 130        mutex_unlock(&dev->i2c_switch_mutex);
 131        return num;
 132}
 133
 134
 135static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
 136{
 137        return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 138}
 139
 140static const struct i2c_algorithm ngene_i2c_algo = {
 141        .master_xfer = ngene_i2c_master_xfer,
 142        .functionality = ngene_i2c_functionality,
 143};
 144
 145int ngene_i2c_init(struct ngene *dev, int dev_nr)
 146{
 147        struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
 148
 149        i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
 150
 151        strscpy(adap->name, "nGene", sizeof(adap->name));
 152
 153        adap->algo = &ngene_i2c_algo;
 154        adap->algo_data = (void *)&(dev->channel[dev_nr]);
 155        adap->dev.parent = &dev->pci_dev->dev;
 156
 157        return i2c_add_adapter(adap);
 158}
 159
 160