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 */ 31 static 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 58 static 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 80 static 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 } 100 101 static 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; 128 129 done: 130 mutex_unlock(&dev->i2c_switch_mutex); 131 return num; 132 } 133 134 135 static u32 ngene_i2c_functionality(struct i2c_adapter *adap) 136 { 137 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; 138 } 139 140 static const struct i2c_algorithm ngene_i2c_algo = { 141 .master_xfer = ngene_i2c_master_xfer, 142 .functionality = ngene_i2c_functionality, 143 }; 144 145 int 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