pci/ngene/ngene-i2c.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * ngene-i2c.c: nGene PCIe bridge driver i2c functions
0004  *
0005  * Copyright (C) 2005-2007 Micronas
0006  *
0007  * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
0008  *                         Modifications for new nGene firmware,
0009  *                         support for EEPROM-copying,
0010  *                         support for new dual DVB-S2 card prototype
0011  */
0012
0013 /* FIXME - some of these can probably be removed */
0014 #include <linux/module.h>
0015 #include <linux/init.h>
0016 #include <linux/delay.h>
0017 #include <linux/slab.h>
0018 #include <linux/poll.h>
0019 #include <linux/io.h>
0020 #include <asm/div64.h>
0021 #include <linux/pci.h>
0022 #include <linux/pci_ids.h>
0023 #include <linux/timer.h>
0024 #include <linux/byteorder/generic.h>
0025 #include <linux/firmware.h>
0026 #include <linux/vmalloc.h>
0027
0028 #include "ngene.h"
0029
0030 /* Firmware command for i2c operations */
0031 static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
0032                u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
0033 {
0034     struct ngene_command com;
0035
0036     com.cmd.hdr.Opcode = CMD_I2C_READ;
0037     com.cmd.hdr.Length = outlen + 3;
0038     com.cmd.I2CRead.Device = adr << 1;
0039     memcpy(com.cmd.I2CRead.Data, out, outlen);
0040     com.cmd.I2CRead.Data[outlen] = inlen;
0041     com.cmd.I2CRead.Data[outlen + 1] = 0;
0042     com.in_len = outlen + 3;
0043     com.out_len = inlen + 1;
0044
0045     if (ngene_command(dev, &com) < 0)
0046         return -EIO;
0047
0048     if ((com.cmd.raw8[0] >> 1) != adr)
0049         return -EIO;
0050
0051     if (flag)
0052         memcpy(in, com.cmd.raw8, inlen + 1);
0053     else
0054         memcpy(in, com.cmd.raw8 + 1, inlen);
0055     return 0;
0056 }
0057
0058 static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
0059                    u8 *out, u8 outlen)
0060 {
0061     struct ngene_command com;
0062
0063
0064     com.cmd.hdr.Opcode = CMD_I2C_WRITE;
0065     com.cmd.hdr.Length = outlen + 1;
0066     com.cmd.I2CRead.Device = adr << 1;
0067     memcpy(com.cmd.I2CRead.Data, out, outlen);
0068     com.in_len = outlen + 1;
0069     com.out_len = 1;
0070
0071     if (ngene_command(dev, &com) < 0)
0072         return -EIO;
0073
0074     if (com.cmd.raw8[0] == 1)
0075         return -EIO;
0076
0077     return 0;
0078 }
0079
0080 static void ngene_i2c_set_bus(struct ngene *dev, int bus)
0081 {
0082     if (!(dev->card_info->i2c_access & 2))
0083         return;
0084     if (dev->i2c_current_bus == bus)
0085         return;
0086
0087     switch (bus) {
0088     case 0:
0089         ngene_command_gpio_set(dev, 3, 0);
0090         ngene_command_gpio_set(dev, 2, 1);
0091         break;
0092
0093     case 1:
0094         ngene_command_gpio_set(dev, 2, 0);
0095         ngene_command_gpio_set(dev, 3, 1);
0096         break;
0097     }
0098     dev->i2c_current_bus = bus;
0099 }
0100
0101 static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
0102                  struct i2c_msg msg[], int num)
0103 {
0104     struct ngene_channel *chan =
0105         (struct ngene_channel *)i2c_get_adapdata(adapter);
0106     struct ngene *dev = chan->dev;
0107
0108     mutex_lock(&dev->i2c_switch_mutex);
0109     ngene_i2c_set_bus(dev, chan->number);
0110
0111     if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
0112         if (!ngene_command_i2c_read(dev, msg[0].addr,
0113                         msg[0].buf, msg[0].len,
0114                         msg[1].buf, msg[1].len, 0))
0115             goto done;
0116
0117     if (num == 1 && !(msg[0].flags & I2C_M_RD))
0118         if (!ngene_command_i2c_write(dev, msg[0].addr,
0119                          msg[0].buf, msg[0].len))
0120             goto done;
0121     if (num == 1 && (msg[0].flags & I2C_M_RD))
0122         if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
0123                         msg[0].buf, msg[0].len, 0))
0124             goto done;
0125
0126     mutex_unlock(&dev->i2c_switch_mutex);
0127     return -EIO;
0128
0129 done:
0130     mutex_unlock(&dev->i2c_switch_mutex);
0131     return num;
0132 }
0133
0134
0135 static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
0136 {
0137     return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
0138 }
0139
0140 static const struct i2c_algorithm ngene_i2c_algo = {
0141     .master_xfer = ngene_i2c_master_xfer,
0142     .functionality = ngene_i2c_functionality,
0143 };
0144
0145 int ngene_i2c_init(struct ngene *dev, int dev_nr)
0146 {
0147     struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
0148
0149     i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
0150
0151     strscpy(adap->name, "nGene", sizeof(adap->name));
0152
0153     adap->algo = &ngene_i2c_algo;
0154     adap->algo_data = (void *)&(dev->channel[dev_nr]);
0155     adap->dev.parent = &dev->pci_dev->dev;
0156
0157     return i2c_add_adapter(adap);
0158 }
0159