2005-04-17 02:20:36 +04:00
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/*
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2008-01-27 20:14:45 +03:00
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i2c-stub.c - I2C/SMBus chip emulator
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2005-04-17 02:20:36 +04:00
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Copyright (c) 2004 Mark M. Hoffman <mhoffman@lightlink.com>
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2014-07-10 14:56:59 +04:00
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Copyright (C) 2007-2014 Jean Delvare <jdelvare@suse.de>
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2005-04-17 02:20:36 +04:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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2017-06-16 00:20:54 +03:00
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#define DEBUG 1
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2017-05-16 14:21:05 +03:00
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#define pr_fmt(fmt) "i2c-stub: " fmt
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2005-04-17 02:20:36 +04:00
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#include <linux/errno.h>
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#include <linux/i2c.h>
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2016-02-21 01:33:39 +03:00
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#include <linux/init.h>
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#include <linux/kernel.h>
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2014-07-17 20:56:03 +04:00
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#include <linux/list.h>
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2016-02-21 01:33:39 +03:00
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#include <linux/module.h>
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#include <linux/slab.h>
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2005-04-17 02:20:36 +04:00
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2007-10-14 01:56:31 +04:00
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#define MAX_CHIPS 10
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2014-07-17 20:56:03 +04:00
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/*
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* Support for I2C_FUNC_SMBUS_BLOCK_DATA is disabled by default and must
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* be enabled explicitly by setting the I2C_FUNC_SMBUS_BLOCK_DATA bits
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* in the 'functionality' module parameter.
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*/
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#define STUB_FUNC_DEFAULT \
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(I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | \
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | \
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I2C_FUNC_SMBUS_I2C_BLOCK)
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#define STUB_FUNC_ALL \
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(STUB_FUNC_DEFAULT | I2C_FUNC_SMBUS_BLOCK_DATA)
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2006-08-14 01:46:44 +04:00
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2007-10-14 01:56:31 +04:00
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static unsigned short chip_addr[MAX_CHIPS];
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module_param_array(chip_addr, ushort, NULL, S_IRUGO);
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MODULE_PARM_DESC(chip_addr,
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2008-04-30 01:11:37 +04:00
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"Chip addresses (up to 10, between 0x03 and 0x77)");
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2007-10-14 01:56:31 +04:00
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2014-07-17 20:56:03 +04:00
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static unsigned long functionality = STUB_FUNC_DEFAULT;
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2009-12-06 19:06:29 +03:00
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module_param(functionality, ulong, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(functionality, "Override functionality bitfield");
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2014-07-10 14:56:59 +04:00
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/* Some chips have banked register ranges */
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static u8 bank_reg[MAX_CHIPS];
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module_param_array(bank_reg, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(bank_reg, "Bank register");
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static u8 bank_mask[MAX_CHIPS];
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module_param_array(bank_mask, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(bank_mask, "Bank value mask");
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static u8 bank_start[MAX_CHIPS];
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module_param_array(bank_start, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(bank_start, "First banked register");
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static u8 bank_end[MAX_CHIPS];
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module_param_array(bank_end, byte, NULL, S_IRUGO);
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MODULE_PARM_DESC(bank_end, "Last banked register");
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2014-07-17 20:56:03 +04:00
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struct smbus_block_data {
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struct list_head node;
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u8 command;
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u8 len;
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u8 block[I2C_SMBUS_BLOCK_MAX];
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};
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2007-10-14 01:56:31 +04:00
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struct stub_chip {
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u8 pointer;
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2008-01-27 20:14:45 +03:00
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u16 words[256]; /* Byte operations use the LSB as per SMBus
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specification */
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2014-07-17 20:56:03 +04:00
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struct list_head smbus_blocks;
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2014-07-10 14:56:59 +04:00
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/* For chips with banks, extra registers are allocated dynamically */
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u8 bank_reg;
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u8 bank_shift;
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u8 bank_mask;
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u8 bank_sel; /* Currently selected bank */
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u8 bank_start;
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u8 bank_end;
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u16 bank_size;
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u16 *bank_words; /* Room for bank_mask * bank_size registers */
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2007-10-14 01:56:31 +04:00
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};
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static struct stub_chip *stub_chips;
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2014-07-10 14:45:11 +04:00
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static int stub_chips_nr;
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2005-04-17 02:20:36 +04:00
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2014-07-17 20:56:03 +04:00
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static struct smbus_block_data *stub_find_block(struct device *dev,
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struct stub_chip *chip,
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u8 command, bool create)
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{
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struct smbus_block_data *b, *rb = NULL;
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list_for_each_entry(b, &chip->smbus_blocks, node) {
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if (b->command == command) {
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rb = b;
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break;
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}
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}
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if (rb == NULL && create) {
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rb = devm_kzalloc(dev, sizeof(*rb), GFP_KERNEL);
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if (rb == NULL)
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return rb;
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rb->command = command;
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list_add(&rb->node, &chip->smbus_blocks);
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}
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return rb;
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}
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2014-07-10 14:56:59 +04:00
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static u16 *stub_get_wordp(struct stub_chip *chip, u8 offset)
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{
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if (chip->bank_sel &&
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offset >= chip->bank_start && offset <= chip->bank_end)
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return chip->bank_words +
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(chip->bank_sel - 1) * chip->bank_size +
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offset - chip->bank_start;
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else
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return chip->words + offset;
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}
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2008-07-15 00:38:25 +04:00
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/* Return negative errno on error. */
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2012-10-29 00:37:00 +04:00
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static s32 stub_xfer(struct i2c_adapter *adap, u16 addr, unsigned short flags,
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char read_write, u8 command, int size, union i2c_smbus_data *data)
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2005-04-17 02:20:36 +04:00
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{
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s32 ret;
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2009-12-06 19:06:28 +03:00
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int i, len;
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2007-10-14 01:56:31 +04:00
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struct stub_chip *chip = NULL;
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2014-07-17 20:56:03 +04:00
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struct smbus_block_data *b;
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2014-07-10 14:56:59 +04:00
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u16 *wordp;
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2007-10-14 01:56:31 +04:00
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/* Search for the right chip */
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2014-07-10 14:45:11 +04:00
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for (i = 0; i < stub_chips_nr; i++) {
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2007-10-14 01:56:31 +04:00
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if (addr == chip_addr[i]) {
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chip = stub_chips + i;
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break;
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}
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}
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if (!chip)
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2006-08-14 01:46:44 +04:00
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return -ENODEV;
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2005-04-17 02:20:36 +04:00
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switch (size) {
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case I2C_SMBUS_QUICK:
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dev_dbg(&adap->dev, "smbus quick - addr 0x%02x\n", addr);
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ret = 0;
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break;
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case I2C_SMBUS_BYTE:
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if (read_write == I2C_SMBUS_WRITE) {
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2007-10-14 01:56:31 +04:00
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chip->pointer = command;
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"smbus byte - addr 0x%02x, wrote 0x%02x.\n",
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addr, command);
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2005-04-17 02:20:36 +04:00
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} else {
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2014-07-10 14:56:59 +04:00
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wordp = stub_get_wordp(chip, chip->pointer++);
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data->byte = *wordp & 0xff;
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"smbus byte - addr 0x%02x, read 0x%02x.\n",
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addr, data->byte);
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2005-04-17 02:20:36 +04:00
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}
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ret = 0;
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break;
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case I2C_SMBUS_BYTE_DATA:
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2014-07-10 14:56:59 +04:00
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wordp = stub_get_wordp(chip, command);
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2005-04-17 02:20:36 +04:00
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if (read_write == I2C_SMBUS_WRITE) {
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2014-07-10 14:56:59 +04:00
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*wordp &= 0xff00;
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*wordp |= data->byte;
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"smbus byte data - addr 0x%02x, wrote 0x%02x at 0x%02x.\n",
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addr, data->byte, command);
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2014-07-10 14:56:59 +04:00
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/* Set the bank as needed */
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if (chip->bank_words && command == chip->bank_reg) {
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chip->bank_sel =
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(data->byte >> chip->bank_shift)
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& chip->bank_mask;
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dev_dbg(&adap->dev,
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"switching to bank %u.\n",
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chip->bank_sel);
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}
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2005-04-17 02:20:36 +04:00
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} else {
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2014-07-10 14:56:59 +04:00
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data->byte = *wordp & 0xff;
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"smbus byte data - addr 0x%02x, read 0x%02x at 0x%02x.\n",
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addr, data->byte, command);
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2005-04-17 02:20:36 +04:00
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}
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2007-10-14 01:56:31 +04:00
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chip->pointer = command + 1;
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2005-04-17 02:20:36 +04:00
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ret = 0;
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break;
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case I2C_SMBUS_WORD_DATA:
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2014-07-10 14:56:59 +04:00
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wordp = stub_get_wordp(chip, command);
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2005-04-17 02:20:36 +04:00
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if (read_write == I2C_SMBUS_WRITE) {
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2014-07-10 14:56:59 +04:00
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*wordp = data->word;
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"smbus word data - addr 0x%02x, wrote 0x%04x at 0x%02x.\n",
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addr, data->word, command);
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2005-04-17 02:20:36 +04:00
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} else {
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2014-07-10 14:56:59 +04:00
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data->word = *wordp;
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"smbus word data - addr 0x%02x, read 0x%04x at 0x%02x.\n",
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addr, data->word, command);
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2005-04-17 02:20:36 +04:00
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}
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ret = 0;
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break;
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2009-12-06 19:06:28 +03:00
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case I2C_SMBUS_I2C_BLOCK_DATA:
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2014-07-10 14:56:59 +04:00
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/*
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* We ignore banks here, because banked chips don't use I2C
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* block transfers
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*/
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2014-07-13 19:17:17 +04:00
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if (data->block[0] > 256 - command) /* Avoid overrun */
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data->block[0] = 256 - command;
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2009-12-06 19:06:28 +03:00
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len = data->block[0];
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if (read_write == I2C_SMBUS_WRITE) {
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for (i = 0; i < len; i++) {
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chip->words[command + i] &= 0xff00;
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chip->words[command + i] |= data->block[1 + i];
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}
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"i2c block data - addr 0x%02x, wrote %d bytes at 0x%02x.\n",
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addr, len, command);
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2009-12-06 19:06:28 +03:00
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} else {
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for (i = 0; i < len; i++) {
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data->block[1 + i] =
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chip->words[command + i] & 0xff;
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}
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2012-10-29 00:37:00 +04:00
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dev_dbg(&adap->dev,
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"i2c block data - addr 0x%02x, read %d bytes at 0x%02x.\n",
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addr, len, command);
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2009-12-06 19:06:28 +03:00
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}
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ret = 0;
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break;
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2014-07-17 20:56:03 +04:00
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case I2C_SMBUS_BLOCK_DATA:
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2014-07-10 14:56:59 +04:00
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/*
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* We ignore banks here, because chips typically don't use both
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* banks and SMBus block transfers
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*/
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2014-07-17 20:56:03 +04:00
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b = stub_find_block(&adap->dev, chip, command, false);
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if (read_write == I2C_SMBUS_WRITE) {
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len = data->block[0];
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if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) {
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ret = -EINVAL;
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break;
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}
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if (b == NULL) {
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b = stub_find_block(&adap->dev, chip, command,
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true);
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if (b == NULL) {
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ret = -ENOMEM;
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break;
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}
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}
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/* Largest write sets read block length */
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if (len > b->len)
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b->len = len;
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for (i = 0; i < len; i++)
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b->block[i] = data->block[i + 1];
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/* update for byte and word commands */
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chip->words[command] = (b->block[0] << 8) | b->len;
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dev_dbg(&adap->dev,
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"smbus block data - addr 0x%02x, wrote %d bytes at 0x%02x.\n",
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addr, len, command);
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} else {
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if (b == NULL) {
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dev_dbg(&adap->dev,
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"SMBus block read command without prior block write not supported\n");
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ret = -EOPNOTSUPP;
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break;
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}
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len = b->len;
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data->block[0] = len;
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for (i = 0; i < len; i++)
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data->block[i + 1] = b->block[i];
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dev_dbg(&adap->dev,
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"smbus block data - addr 0x%02x, read %d bytes at 0x%02x.\n",
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addr, len, command);
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}
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ret = 0;
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break;
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|
2005-04-17 02:20:36 +04:00
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default:
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dev_dbg(&adap->dev, "Unsupported I2C/SMBus command\n");
|
2008-07-15 00:38:25 +04:00
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ret = -EOPNOTSUPP;
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2005-04-17 02:20:36 +04:00
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break;
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} /* switch (size) */
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return ret;
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}
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static u32 stub_func(struct i2c_adapter *adapter)
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{
|
2014-07-17 20:56:03 +04:00
|
|
|
return STUB_FUNC_ALL & functionality;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
2006-09-04 00:39:46 +04:00
|
|
|
static const struct i2c_algorithm smbus_algorithm = {
|
2005-04-17 02:20:36 +04:00
|
|
|
.functionality = stub_func,
|
|
|
|
.smbus_xfer = stub_xfer,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct i2c_adapter stub_adapter = {
|
|
|
|
.owner = THIS_MODULE,
|
2008-07-15 00:38:29 +04:00
|
|
|
.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
|
2005-04-17 02:20:36 +04:00
|
|
|
.algo = &smbus_algorithm,
|
|
|
|
.name = "SMBus stub driver",
|
|
|
|
};
|
|
|
|
|
2014-07-10 14:56:59 +04:00
|
|
|
static int __init i2c_stub_allocate_banks(int i)
|
|
|
|
{
|
|
|
|
struct stub_chip *chip = stub_chips + i;
|
|
|
|
|
|
|
|
chip->bank_reg = bank_reg[i];
|
|
|
|
chip->bank_start = bank_start[i];
|
|
|
|
chip->bank_end = bank_end[i];
|
|
|
|
chip->bank_size = bank_end[i] - bank_start[i] + 1;
|
|
|
|
|
|
|
|
/* We assume that all bits in the mask are contiguous */
|
|
|
|
chip->bank_mask = bank_mask[i];
|
|
|
|
while (!(chip->bank_mask & 1)) {
|
|
|
|
chip->bank_shift++;
|
|
|
|
chip->bank_mask >>= 1;
|
|
|
|
}
|
|
|
|
|
treewide: kzalloc() -> kcalloc()
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:
kzalloc(a * b, gfp)
with:
kcalloc(a * b, gfp)
as well as handling cases of:
kzalloc(a * b * c, gfp)
with:
kzalloc(array3_size(a, b, c), gfp)
as it's slightly less ugly than:
kzalloc_array(array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
kzalloc(4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@
(
kzalloc(
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
|
kzalloc(
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@
(
kzalloc(
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
|
kzalloc(
- sizeof(u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(char) * COUNT
+ COUNT
, ...)
|
kzalloc(
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@
- kzalloc
+ kcalloc
(
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
kzalloc(
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
kzalloc(
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
kzalloc(
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
kzalloc(
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@
(
kzalloc(
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
kzalloc(
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
kzalloc(
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
kzalloc(sizeof(THING) * C2, ...)
|
kzalloc(sizeof(TYPE) * C2, ...)
|
kzalloc(C1 * C2 * C3, ...)
|
kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * E2
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- (E1) * (E2)
+ E1, E2
, ...)
|
- kzalloc
+ kcalloc
(
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-13 00:03:40 +03:00
|
|
|
chip->bank_words = kcalloc(chip->bank_mask * chip->bank_size,
|
|
|
|
sizeof(u16),
|
|
|
|
GFP_KERNEL);
|
2014-07-10 14:56:59 +04:00
|
|
|
if (!chip->bank_words)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2017-05-16 14:21:05 +03:00
|
|
|
pr_debug("Allocated %u banks of %u words each (registers 0x%02x to 0x%02x)\n",
|
2014-07-10 14:56:59 +04:00
|
|
|
chip->bank_mask, chip->bank_size, chip->bank_start,
|
|
|
|
chip->bank_end);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void i2c_stub_free(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < stub_chips_nr; i++)
|
|
|
|
kfree(stub_chips[i].bank_words);
|
|
|
|
kfree(stub_chips);
|
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
static int __init i2c_stub_init(void)
|
|
|
|
{
|
2007-10-14 01:56:31 +04:00
|
|
|
int i, ret;
|
|
|
|
|
|
|
|
if (!chip_addr[0]) {
|
2017-05-16 14:21:05 +03:00
|
|
|
pr_err("Please specify a chip address\n");
|
2006-08-14 01:46:44 +04:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
2007-10-14 01:56:31 +04:00
|
|
|
|
|
|
|
for (i = 0; i < MAX_CHIPS && chip_addr[i]; i++) {
|
|
|
|
if (chip_addr[i] < 0x03 || chip_addr[i] > 0x77) {
|
2017-05-16 14:21:05 +03:00
|
|
|
pr_err("Invalid chip address 0x%02x\n",
|
2012-10-29 00:37:00 +04:00
|
|
|
chip_addr[i]);
|
2007-10-14 01:56:31 +04:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2017-05-16 14:21:05 +03:00
|
|
|
pr_info("Virtual chip at 0x%02x\n", chip_addr[i]);
|
2006-08-14 01:46:44 +04:00
|
|
|
}
|
|
|
|
|
2007-10-14 01:56:31 +04:00
|
|
|
/* Allocate memory for all chips at once */
|
2014-07-10 14:45:11 +04:00
|
|
|
stub_chips_nr = i;
|
|
|
|
stub_chips = kcalloc(stub_chips_nr, sizeof(struct stub_chip),
|
|
|
|
GFP_KERNEL);
|
2017-05-16 14:21:05 +03:00
|
|
|
if (!stub_chips)
|
2007-10-14 01:56:31 +04:00
|
|
|
return -ENOMEM;
|
2017-05-16 14:21:05 +03:00
|
|
|
|
2014-07-10 14:56:59 +04:00
|
|
|
for (i = 0; i < stub_chips_nr; i++) {
|
2014-07-17 20:56:03 +04:00
|
|
|
INIT_LIST_HEAD(&stub_chips[i].smbus_blocks);
|
2007-10-14 01:56:31 +04:00
|
|
|
|
2014-07-10 14:56:59 +04:00
|
|
|
/* Allocate extra memory for banked register ranges */
|
|
|
|
if (bank_mask[i]) {
|
|
|
|
ret = i2c_stub_allocate_banks(i);
|
|
|
|
if (ret)
|
|
|
|
goto fail_free;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-10-14 01:56:31 +04:00
|
|
|
ret = i2c_add_adapter(&stub_adapter);
|
|
|
|
if (ret)
|
2014-07-10 14:56:59 +04:00
|
|
|
goto fail_free;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
fail_free:
|
|
|
|
i2c_stub_free();
|
2007-10-14 01:56:31 +04:00
|
|
|
return ret;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit i2c_stub_exit(void)
|
|
|
|
{
|
|
|
|
i2c_del_adapter(&stub_adapter);
|
2014-07-10 14:56:59 +04:00
|
|
|
i2c_stub_free();
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
|
|
|
|
MODULE_DESCRIPTION("I2C stub driver");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
module_init(i2c_stub_init);
|
|
|
|
module_exit(i2c_stub_exit);
|