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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ngene-i2c.c: nGene PCIe bridge driver i2c functions4 *5 * Copyright (C) 2005-2007 Micronas6 *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 prototype11 */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 else54 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